To provide a deep hole drilling device capable of preventing the development of a tool mark.
This deep hole drilling device is provided with a tool 12 rotatingly driving and drilling a deep hole Wa in a workpiece W, an accelerometer 19 detecting the vibration of the tool 12 in the deep-hole drilling as an acceleration, a monitoring device 20 analyzing the frequency of the acceleration detected by the accelerometer 19 and, when overall values of whirling natural frequency and bending natural frequency in a frequency range other than twisting natural vibration frequency constantly generating during the deep-hole drilling exceed a preset threshold , determining that a tool mark is generated in the deep hole Wa, and an NC device 18 controlling the rotating speed and the sending speed of the tool 12 based on the determination of the monitoring device 20.
HIROTA KAZUO
KAGUCHI HITOSHI
KASUGATA YOSHITAKE
KANBE AKIO
Tadahiro Mitsuishi
Yasuyuki Tanaka
Hiroshi Matsumoto