注射成型工艺参数对聚碳酸酯残余应力的影响

Effect of Injection Molding Parameters on Residual Stress of Polycarbonate

采用正交实验法考察了不同注射成型工艺参数对聚碳酸酯(PC)残余应力的影响,结果表明:熔体温度对残余应力影响最大,冷却时间和模具温度次之,注射压力影响最小。熔体温度升高,分子链快速松弛,残余应力减小。同时试样浇口附近处的残余应力较大且分布集中,沿熔体流动方向,残余应力逐渐减小。对于不同成型工艺,残余应力的分布趋势基本相同。

The influences of injection molding parameters on the residual stress of polycarbonate specimens were investigated by using orthogonal method.The results show that the most significant factor is melt temperature followed by cooling time and mold temperature,and the injection pressure has less influence.Because of the rapid relaxation of molecule chain,the residual stress decreases with increasing the melt temperature.The residual stress which decreases gradually along the flow direction is concentrated and high around the gate.The different injection molding processes take little influence on the distribution of the residual stress.