Title:
DEEP HOLE DRILLING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2008/001735
Kind Code:
A1
Abstract:
A deep hole drilling apparatus which prevents development of a tool mark. The
deep hole drilling apparatus comprises a tool (12) for drilling a deep hole (Wa)
in a work (W) by rotation drive, an accelerometer (19) for detecting the vibration
of the tool (12) as acceleration during deep hole drilling, a monitoring unit
(20) for analyzing the frequency of the detected acceleration and judging that
a tool mark is produced in the deep hole (Wa) when the overall values of the whirling
natural frequency and the bending natural frequency in the frequency range other
than the frequency of the torsion natural frequency caused at all time during
deep hole drilling exceed predetermined thresholds (α), and an NC machine
(18) for controlling the rotational speed and the feed speed of the tool (12) according
to the judgment made by the monitoring unit (20).
Inventors:
KAWASHITA RIMPEI (JP)
HIROTA KAZUO (JP)
KAGUCHI HITOSHI (JP)
KASUBATA YOSHITAKE (JP)
KAMBE AKIO (JP)
HIROTA KAZUO (JP)
KAGUCHI HITOSHI (JP)
KASUBATA YOSHITAKE (JP)
KAMBE AKIO (JP)
Application Number:
PCT/JP2007/062735
Publication Date:
January 03, 2008
Filing Date:
June 26, 2007
Export Citation:
Assignee:
MITSUBISHI HEAVY IND LTD (JP)
KAWASHITA RIMPEI (JP)
HIROTA KAZUO (JP)
KAGUCHI HITOSHI (JP)
KASUBATA YOSHITAKE (JP)
KAMBE AKIO (JP)
KAWASHITA RIMPEI (JP)
HIROTA KAZUO (JP)
KAGUCHI HITOSHI (JP)
KASUBATA YOSHITAKE (JP)
KAMBE AKIO (JP)
International Classes:
B23B49/00; B23B41/02; B23Q15/12; B23Q17/12; G05B19/416
Foreign References:
| JP2001162489A | 2001-06-19 | |||
| JPH1177532A | 1999-03-23 | |||
| JPS62246408A | 1987-10-27 | |||
| JP2007190628A | 2007-08-02 | |||
| JPH0751992A | 1995-02-28 | |||
| JP2003159607A | 2003-06-03 | |||
| JPH0326555B2 | 1991-04-11 |
Other References:
See also references of EP 2033729A4
Attorney, Agent or Firm:
MITSUISHI, Toshiro et al. (9-15 Akasaka 1-chome, Minato-ku Tokyo 52, JP)
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