塑膠外殼中凸轂設計對鎖附強度之研究

凸轂(boss)常使用於3C產品的塑膠外殼中，利用自攻螺絲作為上下蓋的鎖附及PCB板或其他零件固定等用途。由於凸轂的設計大多依靠經驗值，假如設計錯誤，容易造成鎖附強度不足，使得產品維修成本增加。因此，希望藉由實驗找出最佳的凸轂設計值。在本實驗中，使用一般常用於外殼鎖附的兩種規格TP2.6 mm和TP3.0 mm的自攻螺絲，在試片上設定凸轂八種不同內徑2.1、2.2、2.3、2.4 mm(TP2.6 mm自攻螺絲使用)與2.5、2.6、2.7、2.8 mm(TP3.0 mm自攻螺絲使用)，外徑使用一般建議值，搭配三種不同的塑膠材料ABS、PC與PC/ABS，進行拉拔力測試、重覆鎖附測試、最大扭力測試，經由實驗結果得到最佳的內徑設計參數，提供工程師在塑膠產品外殼設計時的參考。

關鍵字

凸轂；自攻螺絲；鎖附強度

並列摘要

The boss is generally made use of locking the up and bottom covers and the PCB by the self-tapping screws, or fixing the other parts for the plastic housing of the 3C products. Due to the design of the Boss is normally based on the experience, the incorrect design may happen to cause the insufficient locking strength which will accordingly increase the cost for maintenance. Hence the experiment has been proposed and carried out in order to obtain the optimized design value for the boss. 2 specifications (TP2.6 mm and TP3.0 mm) of the self-tapping screws which are generally in use of locking the cover have been applied in the experiment. The bosses with 2.1, 2.2, 2.3 and 2.4 mm inner diameters for the TP 2.6mm self-tapping screw and 2.5, 2.6, 2.7 and 2.8 mm inner diameters for the TP 3.0mm self-tapping screw have been set on the samples. A recommended diameter is applied for the outer diameter. The drawing force test, repetitive locking test and maximum torque test are then carried out by using the 3 plastic materials which are ABS, PC and PC/ABS. As the results of the experiment, the optimized design parameter for the inner diameter is obtained which can be referenced by the engineer for the design of the plastic cover.

並列關鍵字

locking strength ； self-tapping screws ； boss

參考文獻

[15] 朱家慶(2008)，補強肋對塑膠件凸轂鎖附扭矩的影響，台北科技大學製造科技研究所碩士論文。

[14] 廖哲新(2007)，塑膠成型製品中凸轂強度設計之研究，大同大學機械工程系碩士論文。

[16] 陳京凡(2009)，塑膠件凸轂設計對鎖附扭矩之研究，台北科技大學製造科技研究所碩士論文。

[17] 馮志偉(2008)，塑膠射出薄殼件加強肋之最佳化設計，台北科技大學製造科技研究所碩士論文。

參考文獻

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塑膠外殼中凸轂設計對鎖附強度之研究

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