Mould Design


June 27, 2017 Facebook Twitter LinkedIn Google+ Uncategorized



Mold design refers to the digital design of enterprise mold, including cavity mold and cold die, in the traditional mold design, based on the application of digital design tools to improve the quality of mold design, shorten the mold design cycle and other staff. Simply put in a product before the production out of a model, and the mold designer is the design of this model. Mold design staff in the mold NC programming, mold three-dimensional design, product development, three-dimensional design and other fields of employment. Mold design is very complicated work, the most basic requirement is that each mold must be just right to match. Such as a Walkman needs nearly a hundred sets of molds produced, the interface between each of the accessories must be strict fit.

Table of content

1. Mold introduction

2. Design steps

3. Hardware mold

3.1 design preparation

3.2 The basic figure of the molded product

3.3 gold structure

3.4 Parts map

3.5 check the work

4.Continuous die

4.1 Preface

4.2 Mold alignment unit

4.3 Standard parts and specifications

5. Plastic mold

6. Mold CAD / CAE

7.Other references

8.List of Mould Design manufacturers

1. Mold introduction

Mold, is a specific form of a certain way through the material molding of an industrial products, but also to produce a certain shape and size requirements of industrial products and parts of a production tool. Large to the aircraft, cars, small to the cup, nails, almost all of the industrial products must rely on mold molding. The high precision, high consistency and high productivity of mold parts are unmatched by any other processing method. Mold to a large extent determine the quality of products, benefits and new product development capabilities.

2. Design steps

1, the design of the mold products for the feasibility analysis.

2, in the product analysis to be carried out after the work of the product analysis of what kind of mold structure, and the product row process to determine the work of the workmanship, and the use of design software for product development, when the product from the general Follow-up project to start, for example, a product requires five steps, stamping is completed in the product from the beginning of the product drawings to the four projects, three projects, two projects, a project, and start a copy of a copy before A project to start the work, that is, the completion of the five projects to start the work, and then carry out detailed work, note that this step is very important, while the need to be particularly careful, this step to complete the good words, drawing mold will save a lot of time , After the stamping of each project to determine the content, including in the mold, the thickness of the product material to retain the inner and outer lines to determine the size of the use of convex and concave mold, the method of product development is no longer described here, will be launched in the product Method specifically described.

3, preparation, according to the product development plans for preparation, in the drawings to determine the template size, including the fixed plate, unloading board, convex and concave mold, inserts, etc., pay attention to the product directly in the map to prepare, There are great benefits, directly on the drawings to draw the template size, to form a set of statements in the form, on the one hand can complete the preparation, on the other hand in the mold parts of the work to save a lot of work, because the drawing of the components The work only in the preparation drawings to add positioning, pins, guide posts, screw holes can be.

4, after the completion of the preparation can be fully into the mold drawing, drawing in the preparation of a copy of the drawings, the components of the drawing, such as adding screw holes, guide hole, positioning holes and other holes, and punch Mold in a variety of holes need to cut the wire through the hole, in the molding die, the upper and lower mold forming gap, must not forget, so these work is completed after a product of the mold has almost completed 80%, in addition to drawing mold The process should pay attention to: the process, refers to the production, such as pliers line, line cutting until the different processing processes have a complete production of a good layer, so that the line cutting and drawing management has great benefits, such as the distinction between color , The size of the label is also a very important work, but also a most troublesome work, because it is a waste of time.

5, after the completion of the above drawings, in fact, can not release the drawings, the need for proofing of the mold drawings, all the accessories set up, each piece of different mold plate to create a different layer, and the same benchmark The mold set up the analysis, and the process of product development plans into the group diagram, to ensure that the template hole and the bending position of the upper and lower mold clearance with the correct.

3. Hardware mold

3.1 design preparation

1, the necessary drawings, the contents of the gold sample books such as confirmation:

Before the formal design of the gold, the following drawings or documents usually have:

① parts map; ② gold design and production Shi book; ③ design contract; ④ other

And to fully understand the above information, not clear to be confirmed by the customer.

2, grasp the outline of the picture

The parts map determines the ultimate purpose of the gold design and must be thoroughly understood. Usually consists of the following parts:

Front view, floor plan, side view, section view, detailed figure, reference drawing, annotation, tolerance list, list of markings, title bar, others In view of the process should pay attention to the following aspects:

① tolerance requirements more stringent; ② on the gold structure of the affected parts;

② part of the existing picture can not understand; ④ note in the special highlights of the matter

⑤ special materials and heat treatment requirements; ⑥ parts wall thickness thinner (t <0.6mm)

⑦ parts thicker wall thickness; ⑧ appearance of any special requirements

⑨ three-dimensional surface part; ⑩ designer, date, satisfied period, price and so on

3, the three-dimensional shape of the understanding of parts

The part drawing is a two-dimensional drawing, which is converted into a three-dimensional shape in the mind of the designer through the view, and the hand-drawn stereogram is helpful.

Prepare paper and pencil.

First draw the outline of the product outline, and then according to their understanding of the parts map, drawing parts of the parts of the cross-section map.

The above determination of the classification of the future, into the sub-division is very important. If conditions permit, use clay and other auxiliary materials to help understand better.

4, the title bar of the review

The title bar of the parts map generally indicates the tolerances in the drawing, the material of the parts, etc., and must be carefully studied.

(2) the name; ② name; ③ Figure Fan; ④ material (including shrinkage); ⑤ Shi Shou, refers to the details of the material, such as manufacturers, trade names, resin code; ⑥ scale; ⑦ designers; Column

5, the review part of the review

① gate type, location, quantity

② into the sub-line requirements

As the sub-divider will be formed in the surface of the product marks, affect the appearance, especially for the folding site harmful, so the designer should comply with the provisions of the parts map.

③ The surface of the molded product is scratched

Gold designers should avoid the possibility of the above-mentioned defects in the gold structure design.

④ does not pay the requirements of tolerance.

⑤ shape and size of the changes need to obtain the consent of the customer, as a gold designer, not self-determination.

⑥ review of the main view

The main view is the area where the dimensions are more concentrated, confirming both sides of the tolerance and sheet side of the tolerance, and mark the more stringent.

⑦ review of each other view. The method is the same as above

⑧ review of necessary type of effort

⑨ molten resin at the time of injection, will be in the gold part of the surface to produce a considerable injection pressure. Such as injection machine is the largest force less than the injection pressure, the template will be between the gap, the occurrence of overflow phenomenon.

⑩ the need to inject volume of the review

When selecting the injection machine, the injection volume should be reviewed.

3.2 The basic figure of the molded product

The general process of gold design work:

Early review → basic design of the molding material → gold structure design → parts design → map → map

Plastic injection gold design from the basic design of the molded product to start, its correct or not determines the shape of the product is good or bad.

Here on the basic design of the shape of the design techniques to explain:

1, to understand the characteristics of molding materials

The most critical is the flow performance is good or bad and the size of the shrinkage

2, the review of the fillingability

Should consider the following aspects:

① the cavity can be completely filled; ② dissolved seam position; ③ the occurrence of bubbles;

③ deformation of molded products; ⑤ point cut marks; ⑥ other

In the design work, according to the working conditions, using the following methods to analyze and verify:

① similar to the gold type comparison; ② flow ratio (L / T) calculation; ③CAD, CAE

3, the location of the gate to determine

4, the shape of the gate to determine

5, the determination of sub-surface

Should refer to the following principles:

① as far as possible the use of flat; ② easy to process; ③ no off-type occurred; ④ appearance of the division line without impact.

6, the formation of gold modeling decisions

Due to the shrinkage of plastic after cooling, so the gold-type production method to consider the “molding shrinkage”, as follows: (shrinkage of 0.2% as an example)

① Tolerance on both sides: L = 25 ± 0.05 → L0 = 1.02 × 25 = 25.5

② sheet side tolerance: L = 3-0.2 → L0 = [(3 + 2.8) / 2] 1.02 = 2.96

After the above method to calculate the inch method, to go through the following two aspects of correction:

① correction of gold can be modified.

Even the odd number of law.

7, the draft angle of the decision (fixed side)

In order to prevent the defect from the type, it is necessary to set the draft angle at the fixed side core, but in the range of the molded product tolerance, it is generally 30 ‘~ 3 °.

8, the decision of the draft slope (movable side)

If necessary, the movable side can also add draft angle, but generally can not increase. If the top of the poor, can be resolved by adding the top of the way to solve.

9, mandrel configuration

Follow the following principles:

① the top area as large as possible, because the small plunger hole is difficult to process.

② as far as possible the use of dome, because the top hole is difficult to process (but the use of inserts to make the cut line is relatively simple).

③ mandrel to be arranged in the vicinity of the core.

④ top hole around the hole minimum 1mm wall thickness guarantee.

10, the number of production records

3.3 gold structure

After the basic drawing of the molded product is completed, the most important work can be carried out – the design of the gold-shaped structure. This part of the work accounted for 80% of the total work of the gold design. The following is the specific design process:

1, Forming machine gold type to pay the official confirmation:

① confirmation of the distance between the slider

Gold size can not exceed the slider distance, usually to stay more than 20mm safe distance.

② the smallest type of confirmation

Gold type thicker than the minimum thickness of the injection machine

③ confirmation of the maximum opening stroke

④ the maximum clamping force to confirm

⑤ confirmation of the theoretical injection capacity

⑥ Check the diameter of the locating ring (to select the locating ring model)

⑦ Confirmation of the tip shape of the injection nozzle (to select the sprue type)

⑧ the largest thick calculation

T = minimum thickness + maximum opening distance-S1-S2-S

2, the cavity configuration method review

For multi-cavity molds, the position of the cavity should be properly arranged so that the projection center is completely centered on the center of the mold and the flow path is minimally balanced.

3, the cavity wall thickness to determine

4, the choice of mold

For plastic injection molds, molds are standardized.

5, the decision of the type of action

After the template thickness is determined, the sorting action is reviewed.

6, pouring sets

7, to determine the order of mold, and the use of appropriate institutions to ensure that the realization of this mode.

8, the flow channel from the flow plate smooth out of the method:

9, support column configuration review

At the time of injection, the injection opportunity creates an instantaneous injection pressure at the bottom of the movable side plate to cause deformation of the plate. To prevent this from happening, a support column may be provided in the mold frame to prevent the plunger and force Arranged in the vicinity of each cavity for the principle.

10, the decision to cool the water hole

In order to constant mold temperature, must be set up cooling water holes, through the cooling water. The location and quantity of cooling water holes are closely related to the cooling effect, and should be as close as possible to the cavity and as much as possible, but not to interfere.

11, the top part of the configuration

Combined with the basic shape of the forming process, the rational configuration of the mandrel position, be careful not to cool water holes and support columns and other components interfere.

12, gantry sets of mold design

13, positioning ring configuration

14, the configuration of the exhaust

In order to smooth the air inside the cavity, sometimes need to set the exhaust channel. But the general design is not considered, the production of such as the discovery of poor exhaust, and then be resolved.

15, the design of the top pillar and the top guide sleeve

In order to improve the accuracy of the movement of the ejector parts, thus extending the mandrel, core life, to prevent the plunger strain, can be designed out of the column and the top guide sleeve.

16, the identification of parts designation

17, other

At this point, the gold structure of the basic design.

3.4 Parts map

After the completion of the structural design, according to the basic shape of the forming and gold-based structural map for the design of gold parts, including the following:

⑴ design to be processed parts of the picture.

⑵ outside the component parts processing surface.

⑶ purchase part of the goods Shi book.

1, the cavity part of the design:

⑴ from the gold structure of the shape of the cavity part of the shape extracted. X-Y direction and template fitting, pay attention to tolerance and cooperation. Z direction with a screw or hook or key can be fixed.

⑵ forming part of the shape and inch method

According to the basic figure to determine the shape, and consider the following:

① forming the amount of tolerance.

② relationship with other parts (with) and so on.

③ easy to amend the gold type.

④ mechanical processing methods can achieve the processing capacity.

⑤ processing costs.

⑥ other.

⑶ core are used in the form of hook and cavity with the X-Y direction with a strict tolerance to control.

⑷ gate design

⑸ fixed method

⑹ material, hardness of the decision

Consider the following:

① shape of the shape, inch precision to maintain the function.

② the surface quality of the finished product determines the function.

③ impact resistance, rigidity, strength should be sufficient.

④ corrosion resistance.

⑤ wear resistance.

⑥ Machinability.

⑦ mirror characteristics.

⑧ thermal conductivity.

⑨ heat treatment.

⑩ material price.

2, fixed side of the core design

The shape and the inch are determined according to the basic figure of the molded article.

Material selection Refer to the above.

Movable side core, the cavity design is roughly the same as the fixed side, but the design of the top part of the design.

At this point, the gold part of the figure and the shape of the part has been completed, the following part of the gold structure of the parts design.

3.5 check the work

Part of the design after the completion of the map, which is equally important as the design work. In the production before the discovery of errors, than in the production or after the completion of the discovery to save a lot of money and energy.

Check the work, can be borne by the designer itself, but also by a third party.

The main contents of the inspection work are as follows:

1, the important principle of the project

⑴ according to the core, cavity schedule, with or without missing part of the design.

⑵ gold type is appropriate.

(3) Is the setting of the parting face correct? Whether to meet the requirements of gold-type Shi book?

⑷ cavity can be completely filled?

⑸ Is the production cost within the budget?

⑹ whether the cost of forming the product within the budget?

⑺ Can the gold type reach it?

⑻ to ensure that the period, whether to take a reasonable measure?

⑼ shape can be successfully out of the cavity?

⑽ shape of the core can be successfully released?

⑾ gate, flow channel configuration with or without improper?

⑿ cooling waterways with or without interference?

⒀ support column, mandrel, set the guide column with or without interference?

⒁ forming shrinkage calculation is correct?

⒂ inserts are the right way to split?

Are the components on each side of the mating fit with each other?

¹ Forming machine to pay the official name is to meet the requirements?

Are other special requirements satisfied?

2, gold structure of the review

⑴ the current design is correct or not, can improve the place?

⑵ resin flow is expected to correct?

⑶ core, cavity from the type of correct or not?

⑷ slider and sliding core design is correct?

⑸ with the tolerance is correct?

⑹ exhaust channel is appropriate?

⑺ with the gap is appropriate?

⑻ Is it difficult to assemble?

⑼ demolition is convenient?

⑽ alienation phenomenon with or without prevention?

⑾ on both sides of the various parts of the interference between?

3, a detailed review of the part:

⑴ whether the size of each other inconsistent with each other?

⑵ section shape correct or not?

⑶ the number of parts is correct?

⑷ parts material is correct?

⑸ plate rigidity to meet the requirements?

⑹ cavity rigidity, strength is to meet the requirements?

⑺ Is the gate shape appropriate?

(8)Did the processing method be properly considered?

⑼ Is the electrode design correct?

⑽ standard parts issued a book is wrong?

⑾ Has the customer changed all the changes?

⑿ Has the scrap picture been replaced?

(13)inch tolerance, surface roughness is too strict?

⒁ Is the machinability appropriate?

4.Continuous die

4.1 Preface

Stamping die according to the structure can be divided into single engineering model, composite mold, continuous mode three categories. The first two categories need more manpower does not meet the economic benefits, continuous mode can be a large number of high production efficiency. Similarly, the design of a set of high-speed precision continuous die, but also for your production of products (including all the stamping out of the processed products, Foxconn Group mainly terminal, computer chassis and connector with the hardware and the current mobile phone parts Wait). The design of continuous die should pay attention to the spacing between the modules, parts processing accuracy, set the accuracy, with the accuracy and interference issues, in order to achieve the purpose of continuous mass automation mass production.

2) The concept of modular design

The overall structure of the stamping die can be divided into two parts: (1) the common part (2). Common parts can be standardized or standardized, according to the product and the part is difficult to normalize.

3)the composition and specifications of the template

4) the composition of the template

The composition of the stamping die will depend on the type and composition of the mold and the similarity, with the configuration and the reverse configuration. The former is the most commonly used structure, the latter structure is mainly used for extension forming mold or with a special mold.

The main tasks involved include:

(1). Digital mapping – the three-dimensional products and mold models into conventional processing used in the two-dimensional engineering drawings;

(2). The digital design of the mold – According to the product model and the design intention, the establishment of the mold three – dimensional solid model;

(3). Digital analysis of mold simulation – According to the product forming process conditions, the mold parts of the structural analysis, thermal analysis, fatigue analysis and mold movement analysis;

(4). Product forming process simulation – injection molding, stamping forming

(5). Customized for the company’s mold design standards and standard design process;

(6). Mold production management.

5) the specifications of the mold

(1). Mold size and locking screws

The size of the template should be greater than the work area and select the standard template size. The position of the locking screw is related to the type of mold and the size of the template. One of the most commonly used molds are equipped with locking screws in the four corners, the most standard form of work area can be widely used. Long-shaped molds and continuous molds are most commonly used with locking screws arranged in four corners and intermediate positions.

(2) the thickness of the template

The thickness of the template selection and mold structure, stamping processing types, stamping processing and processing, stamping precision, and so have an absolute relationship. According to the theoretical calculation to determine the thickness of the mold is difficult, generally on the experience obtained by the design of the template thickness of the type of use should be as little as possible, with the mold height and clamping height to be standardized to facilitate procurement and inventory management.

6) Design of the template

The main mold of the continuous mold is the punching plate, the pressing plate and the mother template, etc. The structural design is according to the precision of the stamping product, the production quantity, the processing equipment and the processing method of the mold, the maintenance of the mold are the following three Form: (1) monolithic, (2) yoke, (3) inserts.

1, block type

The monolithic formwork is also known as an integral form, and its machined shape must be closed. The whole module is mainly used for simple structure or low precision mold, the processing methods to the main processing (without heat treatment), the use of heat treatment of the template must be implemented line cutting or discharge processing and grinding processing. When the template size is long (continuous mold), it will use two or more pieces and use it together.

2, yoke

The central portion of the yoke pattern is machined into a groove to assemble the block. Its structure according to the application requirements, groove can be composed of other templates. The advantages of this yoke-type template structure are: groove processing is easy, the width of the groove can be adjusted, the processing accuracy is good. But the low rigidity is its shortcoming.

The design considerations for the yoke template are as follows:

(1). The combination of the yoke plate and the block part of the middle of the mating or light with the way, such as mining with the pressure will make the yoke changes.

(2) The yoke plate and the holding function of the block part, in order to withstand the side of the block part of the pressure and pressure, must have sufficient rigidity. In addition, in order to make the yoke plate groove and the block-like parts get close together, the groove corner for the flaring processing, such as yoke groove corner corner can not be made to escape the gap, the block parts to be made for flaring processing.

(3) The division of the block shall take into account its internal shape and the datum must be clarified. In order to make the stamping process does not produce deformation, but also pay attention to the shape of each block.

(4) When the yoke plate is composed of a plurality of pieces, the pitch is changed due to the cumulative error of the processing of each block. The solution is that the intermediate block is designed to be adjustable.

(5) The block structure is arranged in parallel with the mold structure, because the punching part of the block will withstand the lateral pressure to make a gap between the block-like parts or cause the slanting of the block-like parts. This phenomenon is stamping the size of bad, such as stucco jamming bad cause of the important reasons, it must have adequate countermeasures.

(6) The method of fixing the block-shaped part in the yoke shall be fixed according to its size and shape: A. fixed with locking screw, B. fixed with key, Part of the fixed, E. above the pressure pieces (such as the material board) compression fixed.

3, inlay

In the template, a circular or square concave part is machined, and the block-like part is embedded in the template. This kind of template is called inlay structure. The construction has less cumulative tolerance, high rigidity, decomposition and precision good. Due to the advantages of easy machining, machining accuracy determined by the work machine, the final adjustment of the project less, insert-in template structure has become the mainstream of precision stamping die, but the shortcomings of the need for high-precision hole processing machine.

Continuous stamping die With this template construction, in order to make the template with high rigidity requirements, is the design of empty stations. Inserted template construction considerations are as follows:

(1). Embedded hole processing: the template of the embedded hole processing using vertical milling machine (or rule with a milling machine), integrated processing machine, governance with boring machine, a rule grinder, wire cutting machine and so on. Embedded in the processing of the benchmark, the use of wire cutting electric processing machine, in order to improve its processing accuracy is the second or more line cutting.

(2) The method of fixing the inserts: The determinants of the fixation method of the inserts are the accuracy of the processing, the ease of assembling and decomposition, and the possibility of adjustment. The fixation method of the inserts has the following four kinds: A. Fix with screws, B is fixed with shoulder, C. is fixed with toe, D. Its upper part is pressed by plate. The insert method of the female template is also used in the press fit, in which case the relaxation result due to the thermal expansion of the processing body should be avoided, and the rotation prevention method should be designed when machining the irregular hole with the circular die sleeve insert.

(3). Embedded components of the establishment and decomposition of the considerations: embedded parts and cavities processing accuracy requirements for high set of operations. In order to obtain even a slight dimensional error can be adjusted in the group immediately, should be considered in advance to solve the countermeasures, insert the specific considerations of the processing of the following five items: A. with pressure into the Department, B. to adjust the embedded insert And the correct position of the press, C embedded with the bottom of the hole with a hole, D. to tighten the screw when the same size of the screw should be used to facilitate the lock and release, E. In order to prevent the formation of the wrong direction , Should be designed to prevent chamfering processing.

4.2 Mold alignment unit

1, mold alignment unit

The mold alignment unit is also known as the die guide of the mold blade. In order to maintain the alignment of the upper mold and the lower mold and shorten the preparation time, according to product accuracy and production quantity and other conditions, the mold alignment unit has the following five:

(1). No guide type: mold installed in the punch directly when the blade of the pair of cooperation, do not use the boot device.

(2). Outer guide type: This device is the most standard structure, the guide device installed in the upper mold base and under the mold base, not through the template, commonly known as the mold seat type.

(3). Outer guidance and internal guide with the type (a): This device is the most commonly used continuous mold structure, punch fixed plate and press plate between the installation of internal guide device. The combination of punch and die is made of fixed pin and external guide. The other function of the inner guide means is to prevent the pressing plate from tilting and protecting the small punch.

(4). External guidance and internal guide with the type (b): This device is a high-precision high-speed continuous use of the mold structure, the internal guide device through the punch fixed plate, pressing plate and die fixed plate Wait. The internal guide device itself also has a mold blade on the combination and protection of small punch role. The main function of the external guide device is the mold decomposition and installation in the punch can get smooth when the purpose.

(5). Inner guide type: This structure does not use the external guide device, the internal guide device through the punch fixed plate, the pressure plate and the mother mold fixed plate, etc., to correctly maintain the position of the relationship between the board Protection punch.

2, guide and guide sets of units

There are two types of guide and fittings for guide and fittings: (A). Outer guide (mold type or main guide), (B). Internal guide type (or auxiliary lead). With the requirements of precision molds, the use of external guidance and internal guidance and the use of high demand.

(1). Outside the guide type: generally used in the mold does not require high precision, most of the mold seat with a unit to sell, the main role is installed in the mold when the blade of the match, almost no stamping The dynamic precision to maintain the effect.

(2). Internal guide type: As the progress of the mold processing machine, the recent rapid popularity. The main role in addition to the mold installed in the punch when the blade on the joint, there are stamping in the dynamic precision to maintain the effect.

(3). External guide and internal guide with the type: a mold with the use of external guidance and internal guide device.

3, punch and die unit (round)

(1). Punch unit: round punch unit according to its shape (shoulder type and straight type), length, maintenance of the convenience, the use of punch unit should be with the pressure plate guide sleeve unit with.

(2). Master mold unit: round die module is also known as the parent mold guide sleeve unit, in the form of a monolithic and separate, according to the number of production, service life and the processing of products or dust, (B). The flap with two diagonal corners, (C). Do you want to use the back plate, (D). Irregular mantle shape Must have a rotation to prevent the design.

4, the material bolt and spring unit

(A). Outer screw type, (B). Sleeve type, (C). Internal screw type. In order to keep the pressing plate parallel to the specified position, the method of stopping the pressing bolts (shoulder contact): (A). Mold seat concave receiving surface, (B). Punch fixed plate top surface, (C). Punch the top of the backplane.

(2). Binder spring unit: Movable press plate Binder spring unit can be roughly divided into: (A). Separate use type, (B). With the combination of bolts and bolts

It is advisable to consider the following points when selecting the binder spring unit:

(A). Ensure that the free length of the spring and the necessary amount of compression (large amount of compression of the spring should be placed in the paste plate pocket).

(B). The amount of spring compression (pre-compression) or the adjustment of the load is necessary.

(C) Consider the ease of mold making or maintenance.

(D). Consider the relationship with the length of the punch or press bolt.

(E). Consider safety (to prevent flying out of the spring when the break).

5, guide pin unit (material feeding direction of the positioning)

(1). Guide pin unit: the main role of the guide pin is continuous punching processing to get the correct feed pitch. Stamping die guide unit with indirect type (guide pin used alone) and direct type (guide pin installed in the punch inside) two forms.

(2) The guide pin is assembled in the same way as the punching punch (mounted on the punch plate). Using a spring to be controlled by a punch plate.

(3) The guide pin is additionally provided in the form of the pressing plate, and the rigidity of the material to be processed, the rigidity of the pressing plate and the rigidity of the pressing plate are required due to the requirement that the guide pin protrude from the amount of the pressing plate and to prevent the mold from rising It is necessary to pay attention to the form of guidance.

(4) The guide pin unit has a direct type, which is installed in the punch, mainly for the shape of the punching (cutting processing) or the extension of the trimming process, the location of the use of products through the hole and extension the inside diameter of.

6, the guide unit

(1). When the punching (cutting) or continuous stamping is carried out, the guide unit is used to guide the width of the material to be processed and to obtain the correct feed pitch.

(B). Movable guide pin type, (C). Board tunnel guide type (() () () () () () () () () (D). Board guide type (two pieces), (E). Lifting pin guide type (movable type, fixed type and both).

(2). Movable pin type and other two, the main role is the material placed in the mold of the initial starting position positioning. (3).

(A). Fixed stop pin, (B). Movable stop pin, (C (c)), (c) The movable stop, (D). Hook stop mechanism, (E). Automatic stop mechanism.

(5). Side-push guide mechanism, stamping processing material is pressed to one side, to prevent the material due to the width of the material and the width of the difference between the material produced by the phenomenon of snake.

(B). Fixed pin lead type (the use of the embryo of the hole), the use of the core material, (D). Conductive plate (integral), (E). Guide plate (split).

7, liter material and the top material unit

(1). Lifting pin unit: its main role is to carry out continuous stamping process will be raised to the material on the material (height is called the feeding height, and to achieve a smooth feeding purposes, in the form of: (A). (Round, with a guide pin hole), the hopper pin is equipped with a guide pin (round), is the most common lifting pin unit. (C). Feeder and guide pin type, both the function of the guide material, the continuous use of the mold of the most commonly used in this form of the hopper pin (D). Lifting pin type (square) If necessary, with air blowing hole. (E). Feeder and guide pin type (square).

(2). Top material unit: automatic punching processing must prevent the punching products or dust in the dummy to jump to the surface of the mold to avoid damage to the mold and the production of bad stamping parts.

(3). Ejector Unit: The main function of the ejector unit is to eject the product or scrap from the inside of the die each time the press is processed. (A). Reverse configuration mold fashion is located in the upper part of the mold, (B). With the configuration of mold fashion in the mold part.

8, fixed pin unit

The shape and size of the fixing pin unit are designed according to the standard specifications. Note: (A) The fixing pin hole should be a through hole and can not be used, and it is easy to use the design method of screw removal. (B). Fixed pin length is the best, not more than the necessary length. (C). Fixed pin hole should be necessary to escape the Department. (D). When placed in the upper part of the mold, should be designed to prevent the fall of the body to prevent its fall. (E). When the one side is press fit, the fixing pin hole on the sliding side is slightly larger than the fixing pin. (F). The number of fixed pins in two principles, try to choose the same size.

9, pressing plate unit

The particularly important point of the briquetting plate is that the binder surface and the master face have the correct parallelism and the buffer pressure required to balance.

10, error detection unit

In the case of continuous die stamping, the mold must design the error detection unit to check whether the change in the feed pitch exceeds its reference and stop the operation of the punch. The error detection unit is installed in the mold, according to its detection method has the following two kinds of installation: (A). The upper mold set the form of sales, when it deviates from the material hole, Contact with the detection. (B). The lower mold is equipped with the form of the check pin, and when the part of the bar is in contact with the check pin. Mold design

Mold design book

The recent use of contact detection methods will be changed, the use of proximity switches to increase the number of cases.

The upper mold is equipped with a standard detection device. Because it is detected near the bottom dead center, it is difficult to completely prevent the effect of preventing the error from starting to the punch. The detection device installed in the lower mold, when the material feeding action is completed immediately after the detection, this method has been taken seriously.

11, waste cut off unit

Continuous processing of the material (scrap) will continue to leave the mold, the treatment in two ways: (A). Using the coiling machine to take, (B). The use of mold cutting device to refine. (A). The use of special waste cutting machine (set in the stamping machine outside), (B) installed in the final mold of the final cut off the unit.

12, the height stops the block unit

The main function of the height stop block unit is to correctly determine the position of the dead center below the mold, in the form of the following two: (A). Stamping process is also often contact with the way, (B). Assembly only contact, stamping Do not touch the way. Also, when the mold handling, storage, in order to prevent the upper mold and the next mold contact, it is best in the mold and the mold between the placement of the block. When the accuracy requirements are not necessary, the use of the standard can be used screw adjustment type.

4.3 Standard parts and specifications

1, the standard parts and specifications

The choice of standard specifications for molds is best considered in the following matters: (A). When the contents of the specifications are not restricted, it is best to use the highest level. (B). In principle, the number of standards used. (C). Mold standard parts without this size, the use of the nearest and then processing.

2, punch design

Punch according to its function can be broadly divided into three parts: (A). Processing materials of the blade tip (cutting edge, its shape irregular shape, square, round, etc.). (B). With the punch fixed plate contact (fixed or shank, the cross-sectional shape of irregular shape, square, round, etc.). (C). The connecting portion (middle portion) of the blade portion and the shank portion.

(B). The grinding direction of the cutting edge, (C), the fixing method of the punch and the shape of the handle, respectively, are described in terms of the length of the cutting part.

(1). Cutting edge length: the length of the cutting edge of the blade design should consider the processing will not produce lateral bending, and the movement of the material plate should be appropriate part of the gap. The relationship between the press plate and the cutting edge of the punch is guided and unguided, and the length of the cutting edge will vary.

(2). Grinding direction of the cutting edge: The grinding direction of the cutting edge is parallel to the shaft (upper cutting) and perpendicular to the shaft (through machining). To improve the wear resistance of the punch And resistant to burning, should adopt the former. Cutting edge shape is convex shape can be used through the processing, concave and convex shape when the use of cutting or processing through the way.

(3). The fixed method of the punch and the shape of the handle: the handle of the punch is divided into two types: straight section and shoulder type. The choice of the fixed way is the precision of the product and mold, The head of the fixed plate processing machinery and processing methods, maintenance methods and so on.

(4). The size and accuracy of the handle: the size and accuracy of the handle will be with the punch of the fixed way and have different requirements.

(5). Punch length adjustment method: the length of the punching punch due to re-grinding processing and shorten, with other projects such as (bending, extension, etc.) to maintain the balance of the length of the punch and maintain the length of the design, It is necessary to adjust the length of the punch.

(6). With the punching punch design: In order to achieve the mass production of stamping products, the quality and safety of the production of no bad products, mold aspects need to consider the following: A. punch processing of the grinding direction to be the same, the surface should Polished. B. To prevent the floating of the dust, the punch can be installed under the top of the pin or processing air holes. C. To reduce the punching force, punching punch applied to the beveled processing, as well as large punch near the small punch should be shorter to reduce the impact.

(7). Punch design with the processing method: the shape of the punch design and processing difficulties have an absolute relationship, when it is too close to the punching plate processing becomes difficult, then the punch should be divided Processing (mining combination)

3, punch fixed plate design

The thickness of the punch fixing plate is related to the size of the mold and the load, generally 30 to 40% of the length of the punch, and the length of the punch guide is 1.5 times higher than the punch diameter.

4, the design of the guide pin (punch)

The size of the guide pin (punch) and the width of the guide hole of the material are designed according to the thickness of the material. The tip shape of the guide pin is roughly divided into two types: Shape, B. conical (push and pull shape).

(1). The shell is the most common form, the market also has standard parts.

(2). Cone has a certain angle, it is suitable for small pieces of high-speed stamping, pushing the angle of the decisive factors are stamping stroke, the workpiece material, the size of the guide hole, processing speed. When pushing the angle, it is easier to correct the position of the material to be machined, but the length of the push part will be longer. Push the connection with the cylindrical part of the connection should be smooth.

5, the design of the mother model

(1). Punching die design

Punching the shape of the mold design should consider the following items: A. Mold life and the shape of the escape angle, B. Die angle of the parent mold, C. Die split.

(A). Mold life and the shape of the escape angle: This design is a very important matter, such as the design is not correct will cause damage to the punch, dust clogging or floating, burr and other stamping problems.

(B). Die angle of the parent mold: the shape of the cut to reduce its punching force, the mother mold can be cut angle design, cut angle when the reduction of large punching force is also large, but easy to cause the product of the anti- The

(C). The division of the mother mold: the mother mold must be shaped grinding and other finishing, because it is concave shape, grinding tool is not easy to enter, it must be divided.

(2) Design of curved master mold

The design of the master mold for bending is to prevent the occurrence of springback and excessive bending. The shape of the shape of the male mold for U-shaped bending is a combination of double R and straight line (inclination of 30 degrees), preferably R shape. R shape after the formation of grinding or NC discharge processing should be polished.

(3). Design of the extension die

It is very important to design the angle and shape of the horns and the shape of the horns. The shape and characteristics of the corners and escape angles are as follows: The extension of the parent mold R is more easily elongated when it is large, but also extends the surface of the product Resulting in wrinkles, the thickness of the extension products sidewall is greater than the thickness. Extrusion of thick plate and the occasion of the hardships, the parent mold R value to take a small, about 1-2 times the thickness of the plate, generally on the cylinder and the square cylinder of the extension of the majority of the extension made straight section, to prevent Burning the occurrence of lubricating oil film and reduce the damage and other purposes, straight section below the Department should have fled (stage or push pull shape) design. Especially in the case of shrinkage processing, this section must be as little as possible.

6, punch the side of the pressure measures

Stamping processing around the punch to bear the equal load is the best ideal (that is, the side pressure is zero) state, the punch to bear the lateral pressure will make the upper mold and the lower part of the horizontal shift, resulting in part of the mold gap Large or smaller (uneven gap) and can not get good precision stamping processing. (A). Change the processing direction, (B). Unilateral processing (punching, bending, extension, etc.) of the products should adopt two rows of arrangement, (C). Chong The head or die is provided with a side stopper, and the side of the cutting edge is provided with a guide portion (particularly, a cutting and breaking process).

7, the pressure plate back pressure plate design

The function of the pressing plate is peeled off from the material of the punch and the function of guiding the small punch, depending on the function of its design content is very different. Thickness of the press plate and selection of the basis of the product design according to the following two: 1. Movable pressing plate, 2. Fixed pressing plate.

The gap between the press plate and the punch should be less than half the diameter of the mold (especially the precision continuous mold should comply with this principle), when the design of the plate when the product varies according to the product must pay attention to the following: The gap between the plate and the punch and the length of the punch guide, 2. the design of the auxiliary guide and the pressing plate and the design of the pressing plate. 3. The movable pressing plate is The relationship between the material guide part and the width of the material to be machined is the relationship between the material guide part and the width of the material to be machined.

8, back pressure plate design

Stamping processing of the main role of the pieces (punch, pressing plate, the mother mold) after the side will bear the surface pressure, when the punch pressure is higher than the surface pressure should adopt the back pressure plate (especially the punch and the mother mold die sets of the back) The use of local use and full use of the two forms.

Mold design software

Modern industrial development soon, are basically using the computer to design and processing, the accuracy can be guaranteed in the 0.002 ~ 0.01 or so.

5. Plastic mold

Plastic mold design

First, accept the task book

The task book for forming a plastic part is usually made by the part designer, as follows:

1, after the approval of the regular pieces of drawings, and indicate the use of plastic grades, transparency and so on.

2, plastic parts manual or technical requirements.

3, production production.

4, plastic parts samples.

Usually the mold design task book by the plastic parts craftsmen according to the task of forming plastic parts of the task book, mold design staff to form plastic parts task book, mold design task book based on the design of mold.

Second, the collection, analysis, digest the original data

1, collection and finishing of the parts design, molding process, molding equipment, machining and special processing materials to prepare for the use of mold design.

2, digestive plastic parts drawing, to understand the use of parts, analysis of plastic parts of the process, dimensional accuracy and other technical requirements. For example, plastic parts in the appearance of the shape, color transparency, the use of performance requirements, plastic parts of the geometric structure, slope, insert, etc. is reasonable, welding marks, shrinkage and other defects in the formation of defects, Equipment, electroplating, bonding, drilling and other post-processing. Select the plastic parts of the size of the highest dimensional accuracy of the analysis to see if the estimated forming tolerance is lower than the plastic parts of the tolerance, whether to meet the requirements of the plastic parts to meet. In addition, but also to understand the plastic plastic molding process parameters.

3, digestion process information, analysis of the task of the proposed method of the molding method, equipment model, material specifications, mold structure type and other requirements are appropriate, can be implemented. Molding materials should meet the strength requirements of plastic parts, with good mobility, uniformity and isotropic, thermal stability. According to the use of plastic parts, molding materials should meet the requirements of dyeing, metallization, decorative properties, necessary elasticity and plasticity, transparency or opposite reflective properties, adhesiveness or weldability requirements.

4, to determine the molding method using direct pressure method, casting method or injection method.

5, select the molding equipment according to the type of molding equipment to mold design, it must be familiar with a variety of molding equipment performance, specifications, features. For example, for the injection machine, the specifications should be aware of the following: injection capacity, clamping pressure, injection pressure, mold installation size, ejector and size, nozzle hole diameter and nozzle spherical radius, gate sleeve positioning ring size, The maximum thickness of the mold and the minimum thickness, the template travel, see the relevant parameters. To estimate the mold size, determine whether the mold can be installed and used on the selected injection machine.

Third, the specific structure of the program

1, to determine the type of mold

Such as compression mold (open, semi-closed, closed), casting die, injection mold and so on.

2, to determine the main structure of the mold type

The ideal mold structure is to determine the necessary molding equipment, the ideal number of cavity, in absolute and reliable conditions can make the work of the mold itself to meet the plastic parts of the process technology and production economy requirements. The technical requirements for plastic parts are to ensure that the plastic parts of the geometric shape, surface finish and dimensional accuracy. Production of economic requirements is to make plastic parts of the low cost, high production efficiency, mold can work continuously, long life, save labor.

Affect the mold structure and mold individual system factors are many, very complex: such as cavity layout. According to the geometric structure of plastic parts, dimensional accuracy requirements, batch size, mold manufacturing difficult, mold costs to determine the number of cavities and their arrangement.

For the injection mold, the plastic parts of the accuracy of 3 and 3a, the weight of 5 grams, the use of hardening pouring system, the number of cavity to take 4-6; plastic parts for the general accuracy (4-5), molding Material for the local crystalline material, the number of cavity up to 16-20; plastic parts of the weight of 12-16 grams, the number of cavity to take 8-12; and the weight of 50-100 grams of plastic parts, 4-8 months. For the amorphous plastic parts recommended cavity number is 24-48, 16-32 and 6-10. When you continue to increase the weight of plastic parts, it is rarely used multi-cavity mold. 7-9 grade precision plastic parts, the maximum number of cavity than the specified 4-5 grade precision plastic increased to 50%.

3, to determine the parting surface

4, the location of the sub-surface to be conducive to mold processing, exhaust, stripping and forming operations, plastic parts, such as the surface quality.

5, to determine the pouring system

Main runner, sprue and gate shape, position, size) and exhaust system (exhaust method, vent position, size).

6, select the top way

(Mandrel, pipe jack, push plate, modular top out), determine the side concave processing methods, core pulling mode.

7, decided to cool, heating and heating the shape of the cooling trench, location, heating components of the installation site

According to the mold material, strength calculation or empirical data, determine the thickness of the mold parts and dimensions, shape structure and all connections, positioning, guide parts position.

8, to determine the main forming parts, structural parts of the form

9, consider the strength of the various parts of the mold, calculate the working parts of the size

If these problems are resolved, the structure of the mold naturally resolved. At this time, we should start drawing the mold structure sketch, ready for the formal drawing.

Fourth, drawing mold map

Requirements in accordance with the national standard drawing, but also requires the combination of factory standards and the state does not specify the factory custom painting.

1, in the drawing mold before the assembly diagram, should draw the process diagram, and to meet the parts drawing and process information requirements. The size of the procedure to be guaranteed by the next procedure shall be marked on the drawing with the words “process size”. If the molding in addition to repair the burr, and then do not carry out other mechanical processing, then the process diagram and parts of the same map. In the process diagram below the best marked part number, name, material, material shrinkage, drawing ratio and so on. Usually put the process picture in the mold assembly diagram.

2, drawing the assembly diagram

Draw the assembly diagram as far as possible using the ratio of 1: 1, first by the cavity began to draw, the main view and other views at the same time to draw.

3, mold assembly diagram should include the following:

(1) mold forming part of the structure

(2) pouring system, the structure of the exhaust system.

(3) parting and sub-mode pickup mode.

(4) Outline structure and all connections, positioning, orientation of the guide.

(5) marked cavity height dimensions (not required, as required) and the overall size of the mold.

(6) Auxiliary tools (pickup tools, correction tools, etc.).

(7) All parts are numbered in sequence, and fill in the schedule.

(8) Mark technical requirements and instructions.

4, mold assembly diagram of the technical requirements Content:

The performance requirements for certain systems of the mold. Such as the ejection system, the requirements of the assembly of the slider core structure.

Requirements for mold assembly process. For example, after the mold assembly, the fitting surface of the fitting surface should not be more than 0.05mm on the mold, below the parallelism requirements, and indicate the size determined by the assembly and the size of the requirements.

Mold use, assembly and disassembly method.

Anti-oxidation treatment, mold number, lettering, marking, oil seal, storage and other requirements.

On the test and test requirements.

5, drawing all parts map

The order of drawing parts from the mold assembly diagram should be: first inside and outside, the first complex after the simple, first forming parts, after the structural parts. Graphic requirements:

Be sure to scale, allow zoom in or out. View the selection is reasonable, the projection is correct, properly arranged. In order to make the processing patent number easy to understand, easy assembly, graphics as much as possible with the assembly diagram, graphics to be clear.

Dimension requires uniform, centralized, orderly and complete. The order of the dimensions is: the main dimensions of the main parts and the output scale, and then marked with the size, and then marked all the size. In the non-main parts on the map marked with the size of the first, after all the dimensions.

Surface roughness. The most roughness of the application is marked on the upper right corner of the drawing, such as “the remaining 3.2.” The other roughness symbols are marked on each surface of the part.

Other parts, such as part name, mold number, material grade, heat treatment and hardness requirements, surface treatment, graphics ratio, free size machining accuracy, technical instructions, etc. should be filled out correctly.

5, proofreading, trial plans, tracing, send sun

The contents of self-proofing are:

1, mold and parts and plastic parts of the relationship between the drawings

2, mold and mold parts of the material, hardness, dimensional accuracy, structure, etc. are in line with the requirements of plastic sheet drawings.

3, plastic parts

Plastic flow, shrinkage, weld marks, cracks, stripping slope, etc. affect the use of plastic parts performance, dimensional accuracy, surface quality and other requirements. Whether the design is insufficient, whether the processing is simple, the choice of shrinkage of molding materials is correct.

4, the molding equipment, refusing injection, injection pressure, clamping force enough, the installation of molds, plastic parts of the South core, stripping with or without problems, injection nozzle and the mouth of the mouth is correct contact.

5, mold structure

Sub-surface position and finishing accuracy is to meet the needs, will not happen flash, open mold can ensure that the plastic parts to stay in the top of the mold side of the device. Is the mold release correct, the size of the push rod, the size of the push tube, the number of positions, the number is appropriate, the push plate will be stuck by the core, will not cause abrasion molding parts.

6, mold temperature adjustment. The power of the heater, the number of cooling medium flow line location, size, quantity is appropriate.

7, the treatment of plastic parts of the side of the concave method, the side of the concave body is appropriate, such as oblique guide cylinder core pulling mechanism and the putter is mutual interference.

8, pouring, exhaust system location, size is appropriate.

9, design drawings

Assembly parts on the layout of the mold parts are appropriate, that is clear whether the missing part of the parts on the part number, name, production quantity, parts of the system or purchased, is the standard or non-standard parts, parts with the processing Precision, molded plastic parts of the high-precision size of the correction processing and margin, mold parts of the material, heat treatment, surface treatment, surface finishing degree is marked, narrative clear.

Parts of the main parts, forming parts working size and with the size. The dimensions should be correct and do not allow the producers to convert.

Check the position of all parts and assembly drawings, whether the projection is correct, whether the painting conforms to the national standard of the drawing, and whether the size is missing.

Check processing performance. (All parts of the geometry, view drawing, size, etc. are conducive to processing)

The main working dimensions of the recovery aid

Professional proofreading in principle by the designer self-proofing project; but to focus on structural principles, process performance and operational safety.

Tracing the first to digest the graphics, according to the national standard description, fill in all the size and technical requirements. After the study and signature.

The drawings are designed by the tool manufacturers to review the technical staff, will sign, check the manufacturing process, and then can be sent to the sun.

Six, the preparation of manufacturing process cards

1, by the tool manufacturing unit technical staff to write manufacturing process cards, and to prepare for the manufacturing process.

2, in the mold parts manufacturing process to strengthen the inspection, the focus of the inspection on the size of the accuracy. Mold assembly is completed by the inspector according to the mold inspection table for testing, the main thing is to test the performance of mold parts is good, the only way to slang mold manufacturing quality.

Seven, test mode and repair mode

Although it is in the selected molding materials, molding equipment, in the expected process conditions for mold design, but people’s understanding is often imperfect, it must be completed in the mold after the test, try to shape the workpiece How is the quality. Found that after all, to eliminate the wrong mode of repair. Plastic parts of the phenomenon of many types of bad phenomenon, the reason is very complex, there are mold reasons, there are reasons for the process conditions, the two are often only together. Before repairing the mold, it should be based on the plastic parts of the adverse phenomena of the actual situation, a detailed analysis of the study, to find out the cause of plastic defects after the proposed remedies. Because the molding conditions are easy to change, so the general practice is to change the molding conditions, when changing the molding conditions can not solve the problem, only to consider repair mold. Repair mold should be more careful, not very sure can not act rashly. The reason is that once the change in the mold conditions, it can no longer make a big transformation and restitution.

Eight, finishing the information for archiving

1, the mold after the test, if not temporarily used, it should be completely erased stripping dross, dust, oil, etc., coated with butter or other anti-rust oil or rust inhibitor, off to custody place custody.

2, the design of the mold to the mold processing success, inspection qualified, during the period generated by the technical information, such as the task book, parts drawing, technical manual, mold assembly diagram, mold parts map, base map, mold design manual, Inspection records, test mode repair records, etc., according to the provisions of the system finishing, binding, number archiving. This seems to be a lot of trouble, but after the repair mold, the design of new molds are very useful.

6. Mold CAD / CAE

1, the basic concept of mold CAD / CAE

CAD: (Computer Aided Design) is the use of computer hardware and software systems to help people on the product or engineering design, drawing, engineering analysis and technical documentation and other design activities in general, is a comprehensive technology.

CAE: (Computer Aided Engineering) is a computer-aided engineering technology. It is a kind of engineering support technology based on modern computational mechanics and computer simulation. It is the main support module to realize mold optimization. For the mold CAE is concerned, the current limited to the numerical simulation method, the future work of the mold state and operational behavior simulation, early detection of design flaws.

2, CAD / CAE technology in the mold design application

The traditional mold design is based on the conceptual design – analysis – sample production – analysis – design – analysis – production – such a complex process before the final identification of those complex mold prototype. With the development of computer, CAD / CAE technology gradually replaced the traditional mold design concept and design method, this technology makes the mold in the real production (including sample production) before the computer application software has been through the precise structure Design, structural analysis and forming simulation process.

The mold design uses the corresponding CAD software, according to the function, appearance and structure requirements to be realized, first design the sketch, and then generate the corresponding entity, then sub-assembly and the overall assembly, simulation mold opening process, check the interference situation, and real Rendering. The whole process can also be modified from top to bottom, the parameters of each process can be changed, and can set the correlation between the parameters.

(1) Sketch reconstruction technology

Sketch design is the basis of the entire mold design. Now the sketch reconstruction technology has been developed very mature, this technology is the mold designers with two-dimensional and three-dimensional design sketch for three-dimensional modeling of key technologies. This technique can modify and reconstruct the various dimensions and associated constraints of the sketch. At present, sketching reconstruction technology has been relatively mature, some large CAD / CAE software systems such as Pro / Engineer, UG and so provide sketch design module.

(2) surface feature design

With the improvement of product quality and aesthetics, and because of the many characteristics of the surface features, the design of the product shape is heavy and the surface feature design becomes an important part of the mold design. Three-dimensional solid modeling, parametric modeling and composite modeling techniques, physical and surface modeling methods, as well as free form feature technology for the mold design provides a powerful tool.

(3) variable assembly design technology

Assembly design modeling methods are bottom-up, conceptual design, top-down and other three methods. Bottom-up method is to design a detailed part, and then assembled products. And top-down is the first product of the entire shape and function of the idea, and then in the entire shape of the level of a division of the product components, sub-components, until the bottom of the rough parts. In the mold, because some of the mold structure is very complex, in the mold design only use top-down design method, variable assembly design to support the top-down design.

The design of the variable assembly designation, expression and dissemination of the design variables and design variables constrained by the conceptual design to meet the design requirements so that the design (mainly part design) of the various stages is carried out on the basis of the product function and design intent, All work is done and completed under product functional constraints. Variable assembly technology is also a key technology to achieve dynamic assembly design, the so-called dynamic assembly design refers to the design variables, design variables constraints, assembly constraints driven by a variable assembly design.

(4) realism technology

Realistic technology is the application of CAD software itself has the rendering technology, has been designed to the model, such as color and material properties, in different external conditions (such as light) to observe the appearance of the model to achieve the original design of the aesthetic requirements.

3, CAD / CAE technology and mold structure analysis mold design

Mold design has not only stay in the design of the appearance and structure, it has been extended to the field of mold structure analysis. The strength, stiffness, impact test simulation, drop test simulation, heat dissipation capacity, fatigue and creep are analyzed by using CAE software (especially finite element software). Through the analysis of the front of the mold structure design is reasonable, analysis of the structure of the reasons and location unreasonable, and then in the CAD software in the corresponding changes, and then in the CAE software for a variety of performance testing, and ultimately determine the requirements of the mold structure The

Based on the application of finite element analysis software, the key is grid division, simulation calculation method and forming contact processing. In addition, the data provided to the software for CAE analysis is also important, and production conditions, equipment performance, product requirements, material properties, etc. will have an impact on the accuracy of the CAE analysis of the mold.

(1) Strength and stiffness analysis

Strength and stiffness are the most important performance requirements in mold design. Using CAE technology, through the mold to impose constraints and load and other external conditions to simulate the true application of the mold, the analysis of the strength and stiffness of the mold to meet the requirements. Mold CAE technology after a short period of time has been used in injection mold, die casting mold, forging die, extrusion die, stamping die and other mold optimization, and in practice to guide the production.

(2) impact test simulation

CAE technology can be used to analyze the effects of time-varying loads such as alternating loads, explosions and impact loads, random loads, and other transient forces on the structure. Such as CAE technology for transient analysis, modal analysis, harmonic response analysis, response spectrum analysis and random vibration analysis, for the analysis of products in special and harsh environments and working conditions, physical response, reliability and durability A complete assessment and solution.

(3) drop test simulation

CAE technology can also be used to analyze the structure due to collision or drop of force, deformation, stress, displacement, vibration response, product structure strength, joint design, stiffness properties, impact resistance, explosion-proof performance and the whole system stability and integrity To make a quantitative assessment.

(4) Analysis of heat dissipation capacity

The current CAE technology simulates the temperature distribution in the mold by simulating the energy generated by the high-power electronic components and the heat generated by conduction, convection, and radiation to determine the heat distribution of the mold, and then the heat dissipation of the various materials initial analysis.

(5) Fatigue and creep analysis

In the mold design, it is necessary to carry out preliminary fatigue analysis and creep analysis for mold products that may be working under concentrated load, cyclic load and constant displacement, or in low temperature or high temperature conditions. Analysis does not need to consider each of the external conditions, but the results of this analysis has a great reference value, if there is unreasonable situation, you can re-design, to avoid unnecessary design and analysis. For example: ANSYS dedicated fatigue analysis software module FE-SAFE can achieve a variety of material model for high and low temperature environment and long-term load under the deformation and failure of the study.

4, CAD / CAE technology and mold forming simulation

Mold forming is a very complex process, there are a lot of factors, so for the complex structure of the mold on the need for forming simulation, test the design of the mold in front of the formation of the strength and stiffness to meet the requirements, only to meet the forming requirements , The initial design work was finally completed.

(1) cold stamping die design process

Cold stamping die is mainly used for metal and non-metallic materials, cold forming. Through the simulation, CAE technology can detect whether the strength level of the mold material in the forming process meets the requirements, whether the heat treatment has played the strength and toughness of the mold.

(2) hot forming

Hot work die for high temperature conditions of metal or non-metal forming, the mold is under high temperature to withstand the alternating stress and impact force, the work forming temperature is often higher for the metal mold but also subject to high temperature oxidation and burning, in the strong Under the condition of water cooling, it is subjected to thermal shock caused by hot and cold changes. Hot work die as a hot forming tool, is widely used in various types of die-casting mold, extrusion die, injection mold, hot die and forging die.

5, CAD / CAE technology in the mold design direction

Mold CAD / CAE technology in the traditional application on the basis of constantly adapt to the new environment and new challenges, to seek new development.

1) and gradually improve the CAD / CAE system of intelligence. Artificial intelligence is one of the several functions of computer, the introduction of artificial intelligence CAD / CAE system, so that it has the experience and knowledge of experts, with learning, reasoning, association and judgment ability, so as to achieve the purpose of design automation.

2)the study of mold motion simulation technology, that is, die stamping process and injection mold motion simulation. Because the die and injection mold structure is complex, in the stamping and injection process, some mold parts of the movement will inevitably produce interference, especially the progressive die may also exist strip movement and mold movement interference, and in the design of these phenomena is difficult Found that only the use of simulation technology on the computer to show its movement state, immediately correct the wrong design, in order to avoid problems in production.

3)collaborative innovation design will become the main direction of mold design, manufacturing vertical integration model makes the world of product sales, product design, product manufacturing and mold manufacturing division of labor more clearly. Mold enterprises through the Internet network for remote collaborative design and manufacturing. According to the degree of enterprise information and the level of cooperation between enterprises, the use of technical means and programs are very different.

4)mold CAD technology application ASP model, will become the development direction. As the mold industry has become the most high-tech industry, any enterprise can not have all the latest technology, so there will be CAD technology application ASP model, that is, a variety of specialized technology applications service units for the mold industry Various enterprises to provide technical services, application services, including reverse design, rapid prototyping, CNC machining outsourcing, mold design, mold forming process analysis and many other aspects.

5)based on the network mold CAD / CAE integrated system will be in-depth development.

7.Other references

Injection Moulding Machine
CNC Engraver
Gantry Milling Machine
Milling Cutter
CNC Turning Machine
Universal Milling Machine
Horizontal Milling Machine
Vertical Milling Machine
Tapping Machine
Water Jet Cutting Machine
Plasma Cutting Machine
EDM – Electrical Discharge Machining
ERP – Enterprise Resource Planning
CAM – Computer Aided Manufacturing
CAD(Computer Aided Design)
cnc-milling-machine
cnc router
cnc-lathe-machine-buyers
3d-printer
cnccomputer-numerical-control
cnc-grinding-machine
cnc-drilling-machine
cnc-machining-center
5-axis-cnc-machine
cnc-machining

8.List of Mould Design manufacturers

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