Title:
DRILL
Document Type and Number:
WIPO Patent Application WO/2017/043129
Kind Code:
A1
Abstract:
In this drill: chip discharge grooves extending from the tip flanks of the drill body toward the back end are formed on the outer circumference of the leading end of the drill body; margins are formed on the sides of the chip discharge grooves that are opposite to the drill rotation direction; and relieving surfaces, the outer diameters of which are smaller than said margins, are formed further past said margins in the direction opposite to the drill rotation direction. The surface roughness of said relieving surfaces, at least along the circumferential direction, is made to be lower than or equal to the surface roughness of said margins.
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Inventors:
NAKANOHARA YOSHITAKA (JP)
Application Number:
PCT/JP2016/065726
Publication Date:
March 16, 2017
Filing Date:
May 27, 2016
Export Citation:
Assignee:
MITSUBISHI MATERIALS CORP (JP)
International Classes:
B23B51/00
Foreign References:
| JPS63267153A | 1988-11-04 | |||
| JPS5590213A | 1980-07-08 | |||
| JP2004141970A | 2004-05-20 | |||
| JP2006055941A | 2006-03-02 | |||
| JP2004299017A | 2004-10-28 | |||
| JPH06312319A | 1994-11-08 | |||
| US20120063857A1 | 2012-03-15 |
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
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