| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2009: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Research Abstract |
In the BTA deep hole drilling 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 is studied numerically as a self-excited vibration caused by time delay. Also, the preventing method by an additional guide pad is proposed, and the effect of the preventing method and the optimal location of the guide pads is studied. Furthermore, the results of numerical analysis and the effect of the preventing method is confirmed by experiments using an actual BTA deep hole drilling machine.
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