電腦輔助工程運用於塑膠射出成型品翹曲變形改善對策之研究

在塑膠射出成型工業中，射出成型參數的設定，例如模溫、熔溫、射出速率、保壓壓力等，均常被用來控制成型品的翹曲。但並沒有單純的法則可以解決所有問題，因為任何一項參數的改變，均會影響到其他的參數。參數間的相互影響造成結果十分複雜，甚至不合邏輯。本研究在探討，如何藉由CAE軟體的計算，配合有系統的歸納分析，得以解決成型品的翹曲變形問題。本研究內容描述了造成收縮及翹曲的基本原因，來說明易被混淆或誤解的理論概念。並使用Moldflow軟體，模擬各種不同成型參數組合的射出成型過程與翹曲。藉由模擬實際的操作變數及使用田口法，找出符合塑料特性及模具設計的最佳成型參數。分析驗證結果顯示，使用田口法分析找出之成型最佳參數組合能有助塑件達到最小翹曲變形量。

關鍵字

翹曲；田口法；射出成型參數；塑膠射出成型

並列摘要

In the Plastic injection industry, the injection parameter settings such as mold temperature, resin temperature, filling speed, packing pressure and so on, are used to control the warp of product. Because any change of a parameter will affect the others, there is no any simple rule to solve all problems. The coupling effects of the injection parameters cause the com -plex and illogical results. This study focused on how to use the CAE calculating capability and systematized analysis to solve the product warp problem. This study explores the root cause of shrinkage and warp, and also explains clearly the theory and concept of shrinkage and warp which formerly easy to confuse or misunderstand. In the study Moldflow program was used to simulate injection process and the warp on different injection parameter and to simulate actual operation parameter and coor- dinates experiments. Taguchi method was used to find out the optimum injection parameters to improve the property of injected product and the tooling design. Base on the simulation results. It was found that the optimum injection parameters from Taguchi method can improve the warp of plastic injection parts.