利用田口式參數設計方法於氣動打釘機噪音減低之研究

Noise Reduction of Pneumatic Nail Tool by Using Taguchi’s Parameter Design Methods

郭倫鴻(Lun-Hung Kuo)

指導教授 ： 張英俊

大同大學/工程學院/機械工程學系所/碩士(2007年)

摘要

在建築業中手工具的應用相當廣泛，依照動力源可分為人力手工具和動力手工具。動力手工具中氣動打釘機的發明，因為具備了省力及操作簡單之優點，廣泛的應用於木屋建築及裝潢工程，為專業建築裝潢工人使用，取代了人力手工具-鐵鎚。氣動打釘機雖然擁有了省力，快速……等優點，但是卻會帶來嚴重的噪音問題。這些問題不僅會影響操作者的工作效率，降低工作環境品質，長期下來更會對操作者產生傷害。但對於氣動打釘機噪音問題的文獻卻非常缺乏，因此吾人選定氣動打釘機為研究對象，希望藉由實驗探討其主要噪音源並找出降低噪音的方法。
氣動打釘機所產生的噪音，有兩種。一個是於打擊釘子的過程中，活塞瞬間撞擊緩衝器，所產生之噪音，稱為衝擊噪音。另一個是於打擊釘子完成後，活塞回歸時瞬間帶動氣動通過排氣出口所產生之噪音，稱為排氣噪音。
本論文藉由調整緩衝器的硬度與活塞的接觸面積，探討其變化對噪音的影響。另外也對吸音材料做出放置變化的實驗研究探討其關係。最後運用田口法，找出其最佳化之組合，結果發現緩衝器硬度 70 HSA，緩衝器撞擊面積114mm2並增加排氣蓋及吸音材料為最佳參數組合，比較下可減少8 dB。

關鍵字

田口法 ； 氣動打釘機 ； 噪音

並列摘要

The hand tools are now in widespread use in the architecture industry and according to the manner of the power source, they may be divided into the manual hand tool and the power tool.
The pneumatic nail tool invention provides with advantages on effort-saving and easy operation, so it has been extensively used for professional cabin construction and decoration project applications, instead of manual hand tool –hammer. However, the pneumatic tool still has serious noise pollution problem which will not only affect operator’s working efficiency but also debase quality of the working environment. Moreover, it will also cause injury to the operator after long-term usage.
In fact, the literature is deficient regarding the pneumatic nail tool noise pollution problem. Therefore, we designated that the pneumatic nail tool as the object of this research and expected we could probe into the main noise sources and find out some effective methods to reduce the noise through the experiment.
There are two kinds of noise from pneumatic nail tool; one is the impact noise that comes from the piston impacting instantaneously on the bumper while firing. The other is the exhaust noise. After a nail is driven, the piston will return to its original position and at this moment the piston will also push the remaining air out from the exhaust gate. As the result the exhaust air causes the noise.
The thesis investigates the influence of variation in the bumper hardness and the impact area of the piston on noise. Moreover, we also discuss the relationship between position of the absorption material and noise.
Finally, by using the Taguchi Methods to discover the optimum combination; the results show that when the bumper hardness and piston impact area were 70 HSA and 114 mm2, with adding the exhaust cover and absorption material, for the optimum parameter combination and the comparison might reduce 8 dB.

並列關鍵字

Taguchi Methods ； pneumatic nail tool ； noise

參考文獻

[1] 林育泉 ’’動力手工具之振動與噪音之研究’’ 清華大學碩士論文, 2005。

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[5] 林佑庭 ’’利用田口式參數設計方法於高轉速光碟機噪音減低之研究” 大同大學碩士論文, 2005。

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