Five main steps in injection mold production


Author: MULAN -Plastic Molding Manufacturer

The manufacture of injection molds can be roughly divided into the following steps: 1. Process analysis of plastic products. Before designing, designers should conduct sufficient analysis and research on their plastic products to make them conform to the principle of injection molding processing, and conduct in-depth consultations with product designers to obtain consensus. Conduct necessary discussions on the geometric shape, dimensional accuracy and appearance requirements of the product, and avoid unnecessary troubles in mold manufacturing as much as possible.

2. Mold structure design. A set of high-quality molds requires not only good processing equipment and skilled mold workers, but also a very important factor is to have good mold design, especially for complex molds, the pros and cons of mold design account for the quality of mold Eighty percent or more. An excellent mold design is: on the premise of meeting customer requirements, reduce processing costs, reduce processing difficulty, and shorten processing time.

To achieve this, we must not only comprehensively digest the customer's requirements, but also have a certain understanding of the injection molding machine, mold structure, processing technology and the processing capacity of the mold factory itself. For this reason, the following points should be paid attention to when designing molds: 1. Be familiar with every detail of each set of mold design and understand the purpose of each mold. 2. When designing, refer to similar designs before, and have an understanding of mold processing and product production, and learn lessons from them.

3. Have a deeper understanding of the working process of the injection molding machine and deepen the understanding of the machine. 4. Go to the factory to understand the process of processing products, understand the characteristics and limitations of each process. 5. Understand the results of mold testing and mold transformation of self-designed molds, and learn from experience.

6. When designing, try to use the more successful mold structure before. 7. Learn more about the impact of mold water on products. 8. Study some special mold structures and understand new mold technology.

Determination of mold materials and selection of standard parts. For the selection of mold materials, in addition to precision and quality, the actual processing and heat treatment capabilities of the mold factory should also be combined to make the correct choice. At the same time, try to use the existing standard parts to shorten the production cycle.

4. Parts processing and mold assembly. When designing, in addition to giving a good structure and reasonable tolerance fit, mold precision is also very important, part processing and mold assembly are also very important. Therefore, in mold manufacturing, the choice of processing accuracy and processing methods has an absolute advantage.

The dimensional error of molded parts mainly includes the following aspects: 1. The mold manufacturing error is about 1/3. 2. The error caused by mold wear is about 1/6. 3. The molded part shrinks unevenly, causing about 1/3 of the error.

4. The scheduled shrinkage does not match the actual shrinkage, and the error is about 1/6. Therefore, to reduce mold manufacturing errors, the machining accuracy must first be improved. With the application of CNC machine tools, this problem has been well controlled. In addition, in order to prevent errors caused by mold wear and deformation, when processing molds with high requirements for precision and high product output, quenching treatment is carried out on key parts such as the cavity and core.

For 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 design of the mold. In order to solve the error caused by the uneven shrinkage rate of the formed parts and the inconsistency between the pre-shrinkage and the actual shrinkage, usually 1/3 of the product tolerance is selected in the mold manufacturing as the mold manufacturing tolerance. Large adjustment space to solve the error generated in the forming process. Fifth, try out the mold.

A set of molds is only 70% to 80% of the entire production process from the beginning of design to the end of assembly. The error caused by the inconsistency between pre-shrinkage and actual shrinkage, the smooth progress of demoulding, the effect of cooling, especially the size, position, and shape of the gate on the accuracy and appearance of the product must be checked by mold testing. Therefore, mold trial is an essential step to check whether the mold is qualified and select the molding process.

For more information about injection molds, please visit the official website of Xingye:

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