A柱内饰件“一模两腔”注塑工艺参数优化

Optimization of Injection Molding Process Parameters for A Cylindrical Inner Parts in Mode of One Mold and Two Cavities

对A柱内饰件模型进行分析,得出浇口应选择潜伏式侧浇口,选择四点进料,模具设置成“一模两腔”结构。对熔体温度、保压压力、保压时间、冷却时间进行研究,得出在熔体温度232℃、保压压力105MPa、保压时间7s、冷却时间29s时,塑件平均体积收缩率为3.42%。对该组工艺参数试验验证后,得出A柱内饰件音响口特征成型完全,没有因为内流道细长而产生缺陷,整体轮廓与检具间隙在允许范围内。

Based on the analysis of the interior decoration model of column A, the gate was determined as a latent side gate, four points of feeding was selected, and the mold was designed a structure with “one mold and two cavities”. According to the analysis of injection molding process the melt temperature was determined as 232 ℃, the holding pressure was set to 105 MPa, the holding time was set as 7 s, and the cooling time was set as 29 s. The plastic volume shrinkage rate in average was 3.42 % for the injection-molded part under this condition. After verifying this group of technical parameters in injection molding, the acoustic port characteristics of the interior trim of column A are formed perfectly, and there is no defect caused by the slender internal flow passage. The clearance between the overall contour and fixture was within the allowable range.