通过自主研发的聚合物压力-比容-温度(PVT)特性在线测试仪获得聚合物真实成型工况下的PVT特性参数,由此得到注射材料收缩率,用于制品模具成型尺寸设计,并计算得到以离线PVT参数为依据进行设计的模具成型尺寸。采用数值模拟方法对上述两种模具尺寸设计结果得到的成型制品精度进行对比分析。结果表明,以在线PVT测试结果为基础设计的模具成型尺寸得到的制品尺寸精度与实际设计要求更加接近。 The PVT characteristic parameters of the polymer under the actual forming conditions were obtained by the self-developed polymer pressure-specific volume-temperature (PVT) characteristic tester, and the shrinkage rate of the injected material was obtained, which was used to calculate the forming dimension of the product mold Obtained offline PVT parameters based on the design of the mold forming size. The numerical simulation method was used to compare the accuracy of the molded products obtained from the above two die size design results. The results show that the dimensional accuracy of the fabricated product based on the online PVT test results is closer to the actual design requirements.