Warpage prediction of the injection-molded strip-like plastic parts

作     者：Chaofang Wang Ming Huang Changyu Shen Zhenfeng Zhao 

作者机构：National Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou University 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2016年第24卷第5期

页      面：665-670页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081504[工学-水利水电工程] 0817[工学-化学工程与技术] 08[工学] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：Supported by the Key Program of National Natural Science Foundation of China(11432003) the Key Research Project for Henan Universities(15A430009) 

主　　题：Strip-like plastic part Warpage prediction Injection molding Numerical simulation 

摘      要：For most strip-like plastic injection molded parts, whose cross section size is much smaller than their length, the traditional Hele-Shaw model and three-dimensional model do not work well in the prediction of the warpage be- cause of their special shape. A new solution was suggested in this work. The strip-like plastic part was regarded as a little-curved beam macrnscopically, and was divided into a few one-dimensional elements. On the section of each elemental node location, two-dimensional thermal finite element analysis was made to obtain the non- uniform thermal stress caused by the time difference of the solidification of the plastic melt in the mold. The stress relaxation, or equivalently, strain creep was dealt with by using a special computing model. On the bases of in-mold elastic stress, the final bending moment to the beam was obtained and the warpage was predict- ed in good a^reement with practical cases.