1. Test mode
A set of injection molds is only 70% to 80% of the entire manufacturing process from the start of design to the completion of assembly. For the error caused by the inconsistency between the predetermined shrinkage and the actual shrinkage, the smoothness of demolding, the effect of cooling, especially the influence of the size, position and shape of the gate on the accuracy and appearance of the product, it is necessary to test the mold. test. Therefore, mold trial is an indispensable step to check whether the mold is qualified or not and to select the molding process.
2. Process analysis of plastic products
Before designing an injection mold, the designer should first analyze and study whether the plastic product conforms to the principle of injection molding, and needs to negotiate carefully with the product designer and reach a consensus. Including product geometry, dimensional accuracy and appearance requirements should be carefully discussed.
3. Mold structure design
A good mold requires not only good processing equipment and skilled mold manufacturing workers, but also good mold design, especially for complex molds, the quality of mold design accounts for more than 80% of the quality of the mold.
4. Determine mold material and select standard parts
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. In addition, in order to shorten the manufacturing cycle, the existing standard parts should be used as much as possible.
5. Parts processing and mold assembly
In addition to giving reasonable structure and tolerance in the design of injection mold accuracy, parts processing and mold assembly are also very important. The dimensional error of molded products is mainly composed of the following parts:
(1) The manufacturing error of the mold is about 1/3;
(2) The error caused by die wear is about 1/6;
(3) The error caused by uneven shrinkage of the molded part is about 1/3;
(4) The error caused by the inconsistency between the scheduled shrinkage and the actual shrinkage is about 1/6.