带倒扣的PVC线盒的模具结构

Mould structure of PVC wire box with undercuts

简要分析了PVC制品的材料特性与其注塑模具的特点。介绍了加工带倒扣的PVC线盒常用的斜顶机构的工作原理,分析了其在脱模和复位过程中出现的问题,以及对产品表观质量的影响。针对斜顶机构的不足,考察了采用内滑块机构实现内壁倒扣的脱模。介绍了内滑块机构的工作原理及优点,分析了其尺寸和装配要求。

According to the characteristics of PVC products, the characteristics of injection mold for PVC products were analyzed briefly. The working principle of common angle lifter mechanism for PVC wire box with undercuts were introduced. The problems occurred in the process of demoulding and re- setting were analyzed. The effects of these problems on surface quality of products were discussed. Ai- ming at the deficiencies of the angle lifter mechanism, inner sliding block mechanism was studied to de- mould inner wall undercuts. The working principle and advantages of the inner sliding block mechanism were introduced. The requirements of size ~nA ~ ~,1 ~.L_ _1~ J.