论文部分内容阅读
利用数值模拟软件重点研究了由快变模温工艺提供的不同温度外场对注塑制品微观结构的影响规律。对结晶型聚丙烯注塑成型的模拟结果表明:提高模具型腔表面温度能有效减薄冷凝层,并降低注射压力;残余应力则随之呈现先降后升的趋势,其分布更均匀。结晶分析模块的结果表明:制品的结晶取向因子整体上随模具型腔表面温度的升高而下降;模具型腔表面温度的升高有利于增大制品晶体的平均粒径,但模具表面温度过高会导致制品晶体的平均粒径减小。
The influence of temperature field on the microstructure of injection molded products provided by fast-changing mold-temperature process was studied emphatically using numerical simulation software. The simulation results of injection molding of crystalline polypropylene indicate that increasing the surface temperature of the mold cavity can effectively reduce the thickness of the condensate layer and decrease the injection pressure. The residual stress then decreases first and then increases, and the distribution is more uniform. The results of the crystallization analysis module show that the crystallographic orientation factor of the product decreases as the temperature of the cavity surface increases. The increase of the surface temperature of the mold cavity is beneficial to increase the average crystal grain size of the product, but the mold surface temperature is too high High results in a decrease in the average crystal grain size of the product.