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What are the main problems to be solved in the design and manufacture of plastic molds?

1. The plastic mold structure should be selected reasonably. According to the drawings and technical requirements of the plastic parts, research and select the appropriate molding method and equipment, combine the processing capacity of the factory, put forward the structural plan of the plastic mold, fully solicit the opinions of relevant parties, and conduct analysis and discussion to make the designed injection mold structure reasonable , reliable quality and easy operation. If necessary, according to the needs of plastic mold design and processing, it is necessary to modify the drawings of plastic parts, but it must be implemented with the consent of the user.

2. The dimensions of the injection molded parts should be calculated correctly. Plastic parts are the direct factors that determine the shape, size and surface quality of plastic parts, which are closely related and require special attention. When calculating the size of the molded part, the average shrinkage method can generally be used. For plastic parts with high precision and need to control the mold repair allowance, it can be calculated according to the tolerance zone method. For large precision plastic parts, the shrinkage of plastic parts in different directions can be calculated by analogy to make up for the influence of some factors that are difficult to consider in theory.

3. The designed plastic mold should be easy to manufacture. When designing the injection mold, try to make the designed plastic mold easy to manufacture and the manufacturing cost is low. Especially for those complex formed parts, it must be considered whether to use general processing methods or special processing methods. If special processing methods are used, how to assemble after processing, similar problems should be considered and solved in the design of injection molds, and at the same time, mold repair after mold trial should be considered, and sufficient mold repair allowance should be reserved.

4. The designed injection mold should be safe and reliable. This requirement involves many aspects of injection mold design, such as filling and clamping in the gating system, good temperature adjustment effect, flexible and reliable demolding mechanism, etc.

5. Plastic mold parts should be wear-resistant and durable. The durability of plastic mold parts affects the service life of the entire plastic mold. Therefore, when designing such parts, it is not only necessary to put forward necessary requirements for their materials, processing methods, heat treatment, etc. But pin-like parts such as push rods are also prone to jamming, bending and breaking, and the resulting failures account for the majority of injection mold failures. To this end, we should also consider how to easily adjust and replace, but pay attention to the adaptation of the part life to the injection mold.

6. The structure of the plastic mold should be adapted to the molding characteristics of the plastic. When designing an injection mold, it is necessary to fully understand the molding characteristics of the plastic used and try to meet the requirements, which is also an important measure to obtain high-quality plastic parts.