BTA深穴加工におけるライフリングマーク発生現象の防止対策(機械力学,計測,自動制御)

概要

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BTA deep hole drilling is used for producing holes of high aspect ratio. In this process, a chatter vibration sometimes occurs and a rifling mark is formed on the surface of the hole. The generating mechanism of the rifling mark in BTA deep hole drilling process has been studied as a self-excited vibration caused by time delay. In this paper, a BTA machining head which has two guide pads is treated, and countermeasures against the generation of rifling mark phenomenon are considered. The influence of the locations of the guide pads is analyzed. Also, the preventing method by an additional guide pad is proposed, and the effect of the preventing method is investigated. Furthermore, the optimal location of the guide pads is studied by quasi-static analysis. According to the numerical result, it was confirmed that the perfect prevention of the generation of rifling mark phenomenon was possible by using an additional guide pad and locating the guide pads appropriately.
2010-07-25