基于气辅注射成型工艺CAE优化的汽车手柄模具设计

针对塑件壁厚大收缩变形大的成型问题,首先借助计算机辅助工程(CAE)分析确定了塑件的成型方式采用气辅注射成型(GAIM)工艺,经优化后,采用单点侧浇口进行浇注,两点注气口进行注气辅助成型。经注塑参数优化、注气参数优化后,能将塑件的收缩变形能控制在0. 3%～0. 42%之间。基于CAE分析,设计了塑件的一模两腔两次打开气辅成型两板模具,模具中,设置了一种复合式两次抽芯哈弗滑块机构、一种通用型斜导柱哈弗滑块机构来进行侧抽芯脱模。复合式机构中,先通过动模垫板与动模板之间的第一次打开,先实现斜型芯的抽芯,而后再通过定模板与动模板之间的第二次打开,来驱动哈弗滑块体进行侧抽芯。CAE优化分析对气辅注射成型模具结构的设计具有非常重要的指导作用,有利于整体设计效率的提升。

Mold Design of Automobile Handle Based on GAIM CAE Optimization

Aimed at the difficulty in the formation of plastic parts with a large wall thickness,shrinkage and deformation,a gas-assisted injection molding process was determined by CAE analysis. After the optimization for this injection mold,a single-point side-gate was adopted for gating,and a two-point gas port was applied for gas-assisted forming. With the optimized injection parameters,the shrinkage deformation of plastic parts could be controlled within 0. 3 %~0. 42 %.Based on the analysis of CAE,a gas-assisted two-plate injection mold with two cavities and two opening was designed.A compound twice-core-pulling half slider mechanism and a universal angle pin half slider mechanism were set up to carry out side core pulling and demolding. In these compound mechanisms,the first opening between the moving plate and moving-base plate on the moving mold side was adopted to realize the core pulling of the inclined core,and then the second opening between the fixed plate of fixed mold and the moving plate of moving mold was applied to drive the two half-sliders to carry out the side-core-pulling. The CAE optimization analysis played a very important role in the structural design of gas-assisted injection mold and it was advantageous to the improvement of overall design efficiency.