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使用Moldflow MPI/Injection-compression模块对薄壁塑件顺序注射压缩成型工艺进行了仿真,采用单因素试验研究了熔体温度、模具温度、延迟时间、压缩距离、压缩速度、压缩压力和保压压力对脱模后热残余应力的影响。仿真结果表明,顺序注射压缩成型薄壁制件热残余应力分布规律与常规注射成型相似,但是前者热残余应力较小且沿流动方向更为均匀;热残余应力随熔体温度、模具温度、压缩距离、压缩速度的增加而减小,随延迟时间和保压压力的增加而增大;压缩压力大于熔体流动阻力后,继续增大压缩力对热残余应力无影响。
The mold injection molding process was simulated by using Moldflow MPI / Injection-compression module. The melt temperature, mold temperature, delay time, compression distance, compression speed, compression pressure and packing pressure Effect on thermal residual stress after demolding. The simulation results show that the thermal residual stress distribution of the thin-walled parts by sequential injection molding is similar to that of the conventional injection molding, but the former has smaller thermal residual stress and more uniform flow direction. The thermal residual stress varies with the melt temperature, mold temperature, Distance and compression speed increase, but decrease with increasing delay time and packing pressure. After the compression pressure is greater than the melt flow resistance, continuing to increase the compression force has no effect on the thermal residual stress.