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International Journal of Machine Tools and Manufacture, Volume 88, January 2015, Pages 194–205.
Kenichiro Matsuzaki1, Takahiro Ryu2, Atsuo Sueoka3, Keizo Tsukamoto4.
- Kagoshima University, Department of Mechanical Engineering, 1-21-40 Korimoto, Kagoshima-shi, Kagoshima, Japan and
- Oita University, Department of Mechanical and Energy Systems Engineering, 700 Dannoharu, Oita-shi, Oita, Japan and
- Kyushu Polytechnic College, 1655-1 Shii, Kokuraminami-ku, Kitakyushu-shi, Fukuoka, Japan and
- Ayabo Corporation 1 Hosogute, Fukama-cho, Anjo-shi, Aichi, Japan
Abstract
Boring and Trepanning Association (BTA) deep hole drilling is used for producing holes with high aspect ratios. In this process, chatter vibration sometimes occurs, and a rifling mark is formed on the bore surface. The rifling mark generating phenomenon is considered to be a result of self-excited vibration caused by time delay. An analytical model is proposed considering the supporting condition of the boring bar in detail. In a real machine for BTA drilling, the boring bar is supported at the oil pressure head and the supporting pad, as well as at the base. The stability of the self-excited vibration is analyzed numerically, and the result is compared with the experiment. The theoretical and experimental results agree well with each other. Furthermore, the effect of an additional guide pad proposed by the authors as a countermeasure is evaluated theoretically and experimentally
