冷却系统对ABS材质汽车后视镜外壳翘曲变形影响

Influence of Cooling System on Warpage and Deformation of ABS Automotive Rearview Mirror Shell

首先对丙烯腈-丁二烯-苯乙烯塑料(ABS)材质的汽车后视镜外壳的注塑加工工艺进行了优化,最终确定了其工艺为:料筒温度、注塑压力、保压压力、保压时间、模具温度分别为260℃,11 MPa,2 MPa,5.0 s,60℃。通过Moldflow软件对ABS材质的汽车后视镜外壳模具冷却系统进行了仿真模拟,并确定了最佳的冷却方案:冷却管路直径为10 mm,管路数目为1根,排列方式处于模具单侧排列,冷却液温度为20℃。仿真结果表明,冷却管路进口和出口的冷却液温度分别为20.02℃和25.20℃;总体冷却时间为30.37 s;注塑件底面最高温度为60.21℃;Z方向的最大翘曲变形量为1.031 mm。另外,还以实际注塑实验对模拟结果进行了验证,10次注塑的结果均与模拟结果十分接近,标准差仅为0.003 mm。

The injection molding process of ABS automotive rearview mirror shell was optimized,and the process was determined as follows:barrel temperature,injection pressure,holding pressure,holding time and mould temperature are 260℃,11 MPa,2 MPa,5.0 s and 60℃respectively.In addition,the mold cooling system of automobile rearview mirror shell made of ABS material was simulated by Moldflow software,and the optimal cooling scheme is determined:the diameter of cooling pipeline is 10 mm,the number of pipeline is 1,the arrangement mode is arranged on one side of the mold,and the temperature of coolant is 20℃.The simulation results show that the coolant temperature at the inlet and outlet of the cooling pipe is 20.02℃and 25.20℃respectively,the total cooling time is 30.37 s;the maximum ground temperature of the injection molding part is 60.21℃,the maximum warpage deformation in the Z direction is 1.031 mm.In addition,the simulation results are verified by the actual injection experiments.The results of 10 injection molding are very close to the simulation results,and the standard deviation is only 0.003 mm.