注射参数对注塑拉伸试样成型的影响

Effect of Injection Parameters on the Moulding of Injected Plastics Tensile Samples

以共聚甲醛为例,采用Moldflow软件对塑料熔体在注塑机模具中的流动行为进行了模拟,研究了熔体温度、模具温度、注射压力、保压压力、注射时间和保压时间等六个注塑机注射参数对注塑拉伸试样成型的影响;并通过试验验证了注射压力的影响与模拟分析结果的一致性。结果表明:对于注塑机的任意一个注射参数,过高或过低都可能会影响注塑试样的质量和力学性能;要确定一个注塑机的注射参数,需从设备、原料的性能参数、生产效率和经济条件等各方面综合考虑,避免仅从单一角度考虑,从而影响成型试样的总体性能。

Taking co-POM as example,melt flow behavior in the mould was simulated by Moldflow software,and the effect of injection parameters including melt temperature,mould temperature,injection pressure, holdup pressure,injection time and holdup time on the moulding of the injected tensile samples was studied.It was validated that the effect of injection pressure was as same as the simulation results.The results show that each injection parameter is too high or too low maybe affect the quality and mechanical property of the injected samples. If it needs to determine the injection parameters,it must give a synthetic consideration on the facility,property parameters of the material,productivity,the economic condition,and so on.Cases considered only from a single point of view must be avoided because it would affect the overall performance of the moulding samples.