| Project/Area Number |
23560262
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Dynamics/Control
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| Research Institution | Kagoshima University (2012-2013)
Kyushu University (2011) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
RYU Takahiro 大分大学, 工学, 教授 (60230877)
SOWA Nobuyuki 九州大学, 工学(系)研究科(研究院), 助教 (40304753)
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Keywords | BTA / 深穴加工 / ライフリングマーク / パターン形成 / 自励振動 |
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| Research Abstract |
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 a hole. The rifling mark generating phenomenon was considered as a self-excited vibration caused by time delay. The analytical model was proposed considering the structure of the real BTA deep hole drilling machine. In the real machine, the boring bar is supported at the oil pressure head and at the intermediate support as well as at the base. The uncertain parameters are identified by the vibration test of the real machine. Furthermore, the stability of the self-excited vibration was analyzed numerically, and the result of numerical analysis is compared with the experiment. It is confirmed that the theoretical and experimental results agree well with each other. Also, the effect of a countermeasure by an additional guide pad is evaluated theoretically and experimentally.
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