具減振導套槍鑽系統進行深孔鑽削之探討

A Study on the Gun Drilling System with Vibration-reduced Bushing in Deep-hole Drilling

洪啟彰(Hung Chichang)

指導教授 ： 簡文通

國立屏東科技大學/工學院/機械工程系所/碩士(2010年)

https://doi.org/10.6346/NPUST.2010.00241

摘要

本研究之目的在探討使用槍鑽系統搭配減振導套進行深孔鑽削的特性，並建立振動頻率與擴孔量的關係式。深孔鑽削時常因鑽頭斷裂或擴孔現象，導致加工時間變長、刀具成本增加和鑽削所得之孔品質不良等問題，究其原因最主要是振動所造成。故目前大都採用配有導套之槍鑽系統執行深孔鑽削加工，惟仍無法有效地消除振動現象。本研究針對此問題，自行設計及製作一種減振導套，搭配槍鑽系統進行一系列的實驗，同時以加速規量取深孔加工的振動頻率，對加工後的工件量測其擴孔量。根據實驗結果分析，比較減振導套及傳統導套對擴孔量的影響，分別建立兩者之振動頻率與擴孔量的關係式，並探討各鑽削參數結合減振導套對擴孔量的影響特性。結果顯示減振導套在轉速4000rpm及進給率70mm/min以下使用能可有效降低擴孔量17.1%。經由驗證實驗得知振動頻率與擴孔量關係式之平均誤差為4.29%。本研究所設計之減振導套及關係式建立對於槍鑽深孔加工及線上監控深孔鑽孔品質可提供實質上的協助及參考。

關鍵詞：深孔加工、槍鑽、擴孔量、減振導套

關鍵字

深孔加工 ； 槍鑽 ； 擴孔量 ； 減振導套

並列摘要

The purpose of this research is to investigate the characteristics in deep-hole drilling process by using gun-drilling system with a vibration-reduced bushing and build a relationship between vibration frequency and hole enhancement. If happens usually a broken driller or hole enhancement can be seen in a deep-hole drilling process. Those phenomena would further cause longer fabrication time, higher tool cost and poor hole quality. The most important reason for such problems is vibration. Hence a traditional bushing is often used in deep-hole drilling process today. However, the vibration problem has not been vanished effectively. In this research a new vibration-reduced bushing has been designed and fabricated and used incorporating with a gun-drilling system to conduct a series of experiments. An accelerometer is used to collect signals of vibration frequency during a drilling operation. A hole enhancement is measured after performing each drilling operation. Then the influence of a vibration-reduced bushing is investigated, and a relationship between vibration relationship and hole enhancement can be established. The characteristics of each hole-drilling parameter on hole enhancement are also performed in this research. The results showed that a reduction of 17.1% for hole enhancement is achieved when the vibration-reduced bushing is used with spindle speed lower then 4000 rpm and feed rate lower than 70 mm/min. Besides, an error of 4.29% has been found by comparing the predicting values obtained from the developed relationship with experimental results. This means the research can provide a practical contribution for deep-hole gun drilling processes and use to monitor a deep-hole drilling operation on-line.

Keywords：Deep-hole drilling, Gun drilling, Hole enhancement, Vibration-reduced Bushing

並列關鍵字

Deep-hole drilling ； Gun drilling ； Hole enhancement ； Vibration-reduced Bushing

參考文獻

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