Several Key Factors for Making Molds Well

For an enterprise, the competition between enterprises is the competition of “technology”.

The technology of mold is also very critical in the whole enterprise.

Mold directly affects the quality of products and the efficiency of production.

It is suggested that you pay attention to the new technology of mold.

Mold is the real weapon to win the enemy on the battlefield.

Here are some design ideas.

For a good product, there are mainly these factors:

  • (1) Raw materials;
  • (2) Product optimization design;
  • (3) Optimization design of mold;
  • (4) Stamping process

Compared with a poor mold, a good mold has a production efficiency of 3-5. To make a good mold (a mold with high production efficiency) mainly depends on these points:

  • (1) Mold material;
  • (2) Technology;
  • (3) Computer aided system;
  • (4) New processing equipment;
  • (5) Mold design and design ideas.

The fifth point is the most important and crucial.

A. Best design

Every product has several design schemes, but the design scheme that is suitable for this product requires the designer’s rich practical experience.

A good design scheme involves all aspects, and all factors should be considered, such as the characteristics of materials (all kinds of different materials, mold design schemes will change), the structural complexity of products, the process parameters of presses, mold steel screening, and the firmness of the mold, etc.

B. Spatial simulation imagination method

Mold designers have stronger spatial imagination ability (spatial logic ability) than ordinary people, that is, when a product is in hand, they can think of various design schemes: the relationship of splicing, and the reasonable compilation of various processes.

To find out the best design, first of all, a variety of design schemes should be designed, compared and screened.

Then determine a more reasonable design scheme, and then use the simulation imagination method to simulate the best design scheme in your brain, simulate the possible deficiencies in the molding (which can also be simulated in the computer), list the possible problems, and correct them in the redesign.

It can reduce unnecessary waste, shorten the time of mold manufacturing, and improve production efficiency.

In the design, many factors are not taken into account.

As a result, there are many defects in the products tested, and they may be scrapped after dozens of rectification.

Unsuccessful design wastes a lot of time and resources.

C. Innovative consciousness

As designers, they all have the consciousness of continuous innovation and boldly put forward their own various design schemes.

Don’t be bound by the thought of a teacher in the past.

Some design ideas of their ancestors can be left behind, and some unsuitable design ideas can be changed.

Technology is constantly developing and evolving, and a new technology is constantly evolving through practice, so we really need to get a new technology.

We need to constantly explore in production practice.

For example, those mold experts, the theory of mold is not imagined out of thin air, but also get experience from practice.

In the design innovation, we should gather mold designers to discuss and study together in the design.

One person’s strength is limited.

Mold design is the most critical!

1. According to the structure, stamping dies can be divided into three categories: single engineering die, composite die and continuous die.

The first two require more manpower, which is not in line with economic benefits.

Continuous mold can produce a large number of products with high efficiency.

Similarly, to design a set of high-speed and precision continuous stamping dies, it is also necessary to control the products you produce (including all products processed by stamping).

In order to achieve the purpose of automatic mass production of continuous dies, attention should be paid to the spacing between modules, part processing accuracy, assembly accuracy, fitting accuracy and interference in the design of continuous dies.

2. Modular design concept:

The overall structure of the stamping die can be divided into two parts: the common part and the part that changes according to the product.

Common parts can be standardized or normalized, and parts that change according to products are difficult to be normalized.

3. Formwork composition and specification:

Formwork composition

The composition of stamping dies will vary according to the type and composition of dies, and there are two categories: forward configuration structure and reverse configuration structure.

The former is the most commonly used structure, and the latter structure is mainly used for drawing forming dies or matching special dies.

4. Formwork design:

The main templates of continuous molds include punch fixing plate, pressing plate, mother template, etc.

The structural design has three forms according to the accuracy of stamping products, production quantity, processing equipment and processing method of molds, and maintenance methods of molds: integral type, yoke type, and inlay type.

Continuous die design technology

5. Modular design:

1. Mold alignment unit

The mold alignment unit is also called the alignment guide device 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 the requirements of product accuracy, production quantity and other conditions, mold alignment units mainly include the following five types:

(1) Unguided type;

(2) External guidance type;

(3) External guidance and internal guidance;

(4) External guidance and internal guidance;

(5) Internally guided.

2. Guide injection and guide sleeve unit

There are two types of guiding methods and accessories of the mold: external guiding type (mold base type or main guiding) and internal guiding type (or auxiliary guiding).

In addition, with the requirements of precision molds, there is a high demand for using the combination of external guidance and internal guidance.

3. Pressing bolt and spring unit

When selecting the pressing spring unit, it is best to consider the following points before deciding:

Ensure the free length and necessary compression of the spring.

Whether it is necessary to adjust the initial spring compression (pre compression) or load;

Consider the ease of mold assembly or maintenance;

Consider the relationship with the length of punch or pressing bolt;

Consider safety (prevent the spring from flying out when it breaks).

4. Guide pin unit (positioning of strip feeding direction)

(1) Guide pin unit: the main function of the guide pin is to obtain the correct feeding pitch during continuous stamping processing.

There are two types of guide units for stamping dies: indirect type (guide pin is used alone) and direct type (guide pin is installed inside the punch).

(2) The assembly method of the guide pin is the same as that of the punching punch (installed on the punch fixing plate).

It is restrained by the punch fixing plate with a spring.

(3) The guide pin is additionally installed in the form of the pressing plate.

Because it is required that the amount of the guide pin protruding from the pressing plate reaches a certain level and it is easy to bring the processed material when the mold rises, it is necessary to pay attention to the rigidity and guiding form of the pressing plate.

(4) The guide pin unit has a direct type, which is installed in the punch, and is mainly used for contour punching (blanking) or edge cutting of drawing engineering.

Its position positioning is based on the hole of the product and the inner diameter of the drawing part.

5. Guide unit

6. Lifting and jacking unit

7. Fixed pin list

8. Pressing plate unit

9. Error detection unit

10. Waste cutting unit

11. Height stop block unit

6. Design of main mold components:

1. Standard parts and specifications

The selection method of standard specifications for molds should preferably consider the following matters:

When the specification content used is not limited, it is best to use the highest level;

In principle, the standard number is adopted;

If there is no such size for the standard parts of the mold, the nearest one shall be used for processing.

2. Design of punch

The punch can be roughly divided into three parts according to its function:

The tip of the cutting edge of the processing material (the cutting edge, whose shape is irregular, square, round, etc.);

The contact part with the punch fixing plate (the fixing part or the handle part, whose cross-section shape has irregular shape, square shape, circular shape, etc.);

The connecting part (middle part) between the blade and the handle.

3. Design of punch fixing plate

The thickness of the punch fixing plate is related to the size of the die and the load, which is generally 30~40% of the punch length, and the length of the punch guide part should be 1 or 5 times higher than the punch diameter.

4. Design of guide pin (punch)

The diameter of the guide part of the guide pin (punch) and the gap between the material guide hole, its size and the amount of protrusion of the pressing plate are designed according to the thickness of the material.

The shape of the leading end of the guide pin is roughly divided into two types: shell shape and conical shape (push-pull shape).

5. Countermeasure of punch side pressure

When stamping, it is the best and ideal state for the punch to bear equal load on the left and right sides (that is, the lateral pressure is zero).

When the punch bears the lateral pressure, it will make the upper die and the lower die offset in the transverse direction, resulting in the part of the die gap becoming larger or smaller (uneven gap) and the stamping processing with good accuracy cannot be obtained.

6. Pressing plate design

The function of the pressing plate is to peel off the material attached to the punch and guide the small punch. Its design content varies greatly according to different functions.

The thickness and selection criteria of the pressing plate are divided into the following two types according to the product design: movable pressing plate and fixed pressing plate.

7. Back pressure plate design

During stamping processing, the main action parts (punch, pressing plate, master die) will bear the surface pressure only after that.

When the punching pressure is higher than the surface pressure, the back pressure plate should be used.

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