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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 (LTD. 1-1 Arai-cho Shinhama2-chome, Takasago-sh, Hyogo 86, 6768686, JP)
川下 倫平 (〒86 兵庫県高砂市荒井町新浜2丁目1番1号 三菱重工業株式会社高砂研究所内 Hyogo, 6768686, JP)
HIROTA, Kazuo (LTD. 1-1 Arai-cho Shinhama2-chome, Takasago-sh, Hyogo 86, 6768686, JP)
廣田 和生 (〒86 兵庫県高砂市荒井町新浜2丁目1番1号 三菱重工業株式会社高砂研究所内 Hyogo, 6768686, JP)
KAGUCHI, Hitoshi (LTD. 1-1 Wadasaki-cho 1-chome, Hyogo-ku, Kobe-sh, Hyogo 85, 6528585, JP)
Application Number:
JP2007/062735
Publication Date:
January 03, 2008
Filing Date:
June 26, 2007
Export Citation:
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Assignee:
MITSUBISHI HEAVY INDUSTRIES, LTD. (16-5, Konan 2-chome Minato-ku Tokyo, 15, 1088215, JP)
三菱重工業株式会社 (〒15 東京都港区港南二丁目16番5号 Tokyo, 1088215, JP)
KAWASHITA, Rimpei (LTD. 1-1 Arai-cho Shinhama2-chome, Takasago-sh, Hyogo 86, 6768686, JP)
川下 倫平 (〒86 兵庫県高砂市荒井町新浜2丁目1番1号 三菱重工業株式会社高砂研究所内 Hyogo, 6768686, JP)
HIROTA, Kazuo (LTD. 1-1 Arai-cho Shinhama2-chome, Takasago-sh, Hyogo 86, 6768686, JP)
廣田 和生 (〒86 兵庫県高砂市荒井町新浜2丁目1番1号 三菱重工業株式会社高砂研究所内 Hyogo, 6768686, JP)
International Classes:
B23B49/00; B23B41/02; B23Q15/12; B23Q17/12; G05B19/416
Attorney, Agent or Firm:
MITSUISHI, Toshiro et al. (Mitsuishi Law and Patent Office, 9-15 Akasaka 1-chome, Minato-ku Tokyo 52, 1070052, JP)
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