Title:
DRILLING METHOD AND DRILLING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2017/145699
Kind Code:
A1
Abstract:
A drilling method for drilling a hole in a work material (10) using a drill bit (2), on the side surface of which a margin section is provided. Said drilling method is provided with a step for preparing the work material (10) and a drilling step for forming a hole (10A) in the work material (10) by advancing the drill bit (2), which is rotating around the axis, toward the work material (10) in the axial direction and cutting the work material (10). In the drilling step, the hole (10A) is formed in the work material (10) while maintaining a positive value for the feed rate of the drill bit (2) in the forward direction D1 and continuously or intermittently changing the rate.
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Inventors:
YAMAMOTO KENJI
NII HIROAKI
NII HIROAKI
Application Number:
PCT/JP2017/003907
Publication Date:
August 31, 2017
Filing Date:
February 03, 2017
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
International Classes:
B23B35/00; B23B47/18
Domestic Patent References:
| WO2014206716A1 | 2014-12-31 | |||
| WO2006109347A1 | 2006-10-19 |
Foreign References:
| JP2015052927A | 2015-03-19 | |||
| JPH0550311A | 1993-03-02 | |||
| US4561813A | 1985-12-31 |
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (JP)
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