超长工作台装饰条的翘曲变形研究

采用计算机辅助工程（CAE）模拟技术，以超长装饰条为研究对象，应用有限元方法研究了温度场、压力场对注塑件残余应力及翘曲变形的影响，重点讨论了注塑件的温度场计算以及热塑性小变形理论下的注塑件翘曲变形计算。对影响超长塑件翘曲变形的因素（如模具温度、熔体温度、注射速率、保压压力等）进行分析，提出翘曲产生的原因及相应的改进措施。结果表明，翘曲变形的原因主要是塑料收缩不均匀，其次是在充模过程中温度不均，造成冷却不一致，此外，分子取向的不一致也会引起装饰条的翘曲变形。

Study on the Warping Deformation of Super-long Worktable Decoration Strips

Using CAE and FEM, the effects of temperature and pressure on residual stress and warpage of super-long decoration strip were investigated. The computation was focused on mould temperature, melt temperature, rate of injection, and holding pressure. The cause of warpage and the improving measures for the injection product were proposed. Results demonstrate that the main reasons of warpage deformation were the asymmetry of plastics shrinkage. The second reason was the temperature asymmetry resulting from the cool-off asymmetry in the filling mold process. The last reason was the non-uniform of molecule orientation.