In order to try to reduce the influence of weld mark on the appearance quality and mechanical properties of plastic products, with the combination of injection molding simulation software and the orthogonal test design, reasonable test analysis programs was designed. Products weld mark depth was the evaluation index, and get the optimal parameter combination which could control the quality of the weld, then the results was verified by molding simulation. The results show that through the optimization of process parameters combination, the weld quality was improved and the negative impact on plastic parts was reduced.

According to the problem of core-pulling in the injection mold design of side holes plastic parts, analyzed the structural features and forming process of side holes plastics. Introduced the injection mold structure of side holes plastics, the design essentials and working process of the injection mold, then reasonable mold structure and side core-pulling mechanism ware designed. The design of inclined guide pillar core-pulling and combined core mechanism reduced the die cost and made the manufacture convenient.