本研究目的在探討3C產品中常用的功能按鍵，在融膠充填的過程中流經不同長度設計的彈臂，對翹曲量與疲勞壽命的影響。利用模流分析軟體Modex3D R9.1與有限元素分析軟體ANSYS Workbench V11及實驗設計法搭配反應曲面分析。採用保壓壓力、模具溫度、冷卻時間等參數因子。結果發現，彈臂長度與保壓壓力為影響翹曲量的最重要之因子。從等高線圖的結論可以得知彈臂在31mm與保壓壓力在120%(射壓MPa)的條件下，會有最小翹曲量。搭配模具溫度80ْ ℃與冷卻時間15 sec，可以得到最低翹曲量3.4µm 。在射出實驗的模具中，相同的彈臂長度的功能按鍵，經過CMM量測其翹曲量，搭配較高的保壓壓力所生產功能按鍵其翹曲量較小。在有限單元分析的結論中，可以得知改良後較短的彈臂設計其抗疲勞壽命較佳。本研究結果可運用於很多彈臂結構的設計上且供機構工程師作為設計之參考。

This research is to investigate the arm design of function key for 3C products. To consider warpage and long life span of fatigue, the different length of feature arm has been designed and analyzed for filling in injection process. Two CAE softwares of Moldex3D R9.1 and ANSYS Workbench V11 are used for simulating based on the fractional factorial design of experiment (DOE) and response surface method with experimental parameters of feature arm length, packing pressure, mold temperature and cooling time. The setting of 31 mm length of arm, 120%(injection pressure MPa) packing pressure, 80ْ℃ mold temperature and 15 sec cooling time can keep low warpage and long life span of fatigue from simulation. Experimental results of injection molding and measured data by CMM have shown that the high packing pressure can keep low warpage for the same length of feature arm. Future application can be applied for a design guide of feature arm for mechanism engineer.

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