1. First, analyze the process of plastic products

Before mold design, you should communicate more with customers about the process details of plastic products, including the geometric shape, dimensional accuracy, and appearance requirements of the product, and communicate as much as possible to avoid unnecessary complexity in mold manufacturing.

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2. Mould structure design

On the premise of meeting the requirements of customers, the processing cost is low, the processing difficulty is small, and the processing time is short. To achieve this, we must first have a good mold design, not only consider the needs of customers, but also have an understanding of the injection molding machine, mold structure, processing technology and the mold factory's own processing capabilities. Therefore, to improve the level of mold design, the following points should be achieved:

1. Understand every detail in the design of each mold and understand the purpose of each part in the mold.

2. When designing, refer to previous similar designs and learn from the experience and lessons.

3. Communicate with experienced teachers to learn and exchange experiences.

4. "There are gods on site" often go to the plastic mold processing site to observe and understand the characteristics and limitations of each processing.

5. Understand the results of mold trial and mold modification of the mold designed by yourself, and learn lessons.

6. In the design, try to use the more successful mold structure before.

7. Research some special mold structures and learn about the latest mold technology.

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3. Purchasing mold materials

In the selection of mold materials, in addition to considering the accuracy and quality of the product, it is also necessary to combine the actual processing and heat treatment capabilities of the mold factory to give the correct choice. In addition, in order to shorten the manufacturing cycle, use existing standard parts as much as possible.

Fourth, parts processing and mold assembly

Except for the best structure and reasonable tolerance matching, the precision of the mold is very important for the part processing and mold assembly. Therefore, the choice of processing accuracy and processing method occupies an absolute dominant position in mold manufacturing.

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In order to reduce mold manufacturing errors, the machining accuracy should first be improved. In addition, in order to prevent errors caused by mold wear and deformation, when molds with high machining accuracy and large product output are required, the key to the cavity, core, etc. The parts should be quenched. In the medium and large molds, in order to save materials and facilitate processing and heat treatment, the mosaic structure should be adopted as much as possible in the mold design.

In order to solve the error caused by uneven shrinkage of the molded part and the inconsistency between the predetermined shrinkage and the actual shrinkage, 1/3 of the product tolerance is generally selected during mold manufacturing as the manufacturing tolerance of the mold. Large adjustment room to solve the error caused by the molding process.

Fifth, try to modify the mold.

A set of molds only completes 70% to 80% of the entire manufacturing process from design to assembly. For the error caused by the inconsistency between the predetermined shrinkage and the actual shrinkage, whether the demolding is smooth or not, how the cooling effect is, especially the influence of the size, position, and shape of the gate on the accuracy and appearance of the product, it must be tested by mold trial. If problems are found during mold trial, confirm and modify with customers in time.