Title:
SMALL-DIAMETER DRILL
Document Type and Number:
WIPO Patent Application WO/2013/065695
Kind Code:
A1
Abstract:
The objective of the present invention is to improve the flow of chips near the convergence point in a small-diameter drill for which grooves are made to converge, thereby improving the precision of the hole position, increasing the quality of the inner walls of the hole that is formed, and accommodating high-efficiency processing. This small-diameter drill is equipped with two or more grooves, a cutting edge arranged at the tip, at least two margins defining the outer circumferential surface of the small-diameter drill, and two or more outer-circumferential recesses that extend so as to make contact with the margins. In addition, this small-diameter drill has a point where two or more grooves converge. At least one of the two or more outer circumferential recesses has a connecting point for interconnecting the two or more grooves at a location closer to the tip than the convergence point.
Inventors:
KATSUKI TAKASHI (JP)
OHMINE MEGUMI (JP)
IKEGAMI EIJI (JP)
HORIKAWA SHINICHI (JP)
OHMINE MEGUMI (JP)
IKEGAMI EIJI (JP)
HORIKAWA SHINICHI (JP)
Application Number:
PCT/JP2012/078063
Publication Date:
May 10, 2013
Filing Date:
October 30, 2012
Export Citation:
Assignee:
TUNGALOY CORP (JP)
International Classes:
B23B51/00
Domestic Patent References:
| WO2011116540A1 | 2011-09-29 |
Foreign References:
| JP2007307642A | 2007-11-29 | |||
| JPS63318208A | 1988-12-27 | |||
| JP2010099790A | 2010-05-06 | |||
| JP2009113177A | 2009-05-28 |
Attorney, Agent or Firm:
TANI & ABE, p. c. (JP)
Patent business corporation A valley and Abe patent firm (JP)
Patent business corporation A valley and Abe patent firm (JP)
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Claims: