Design of Large Hot Runner Injection Mold for Interior Part Based on CAE Analysis

Abstract

According to the shape and structural characteristics of an automotive interior plastic part, this paper has designed a large hot runner injection mold in accordance with the customers’ layout requirement, i.e., one mold and two cavities. It then analyzes the mold filling, cooling, and weld lines via the software, Moldflow, and hence determines a reasonable pouring system; a side core pulling mechanism, “lifter block + square push bar”, has been adopted for the large inverted part on the inner side of the plastic part, while a “lifter + insert” is organized for the two bayonet catches or inverted buckles on the inner side of the plastic part; the combination form of “ejector pin + lifter” has also been employed for the mold release system, with complicated mold structure. Practices prove that the mold structure is reasonable and reliable, and the production of plastic parts meet the quality requirements.