Title:
DRILL AND METHOD FOR PRODUCING MACHINED WORKPIECE USING SAME
Document Type and Number:
WIPO Patent Application WO/2018/123937
Kind Code:
A1
Abstract:
The drill according to an embodiment has a main body, a cutting lip, cutting faces, and flutes. The cutting lip has a curved chisel edge, a pair of first edges and a pair of second edges. The second edges have a first portion extending from the chisel edge and a second portion extending from the first portion toward a first edge. The cutting faces have a first region extending from the first portion and a second region extending from the second portion. A first rake angle of the first region is zero or a negative value. A second rake angle of the second region is a negative value. The absolute value of the second rake angle is greater than the absolute value of the first rake angle.
Inventors:
NISHIKOORI HIRONORI (JP)
Application Number:
PCT/JP2017/046366
Publication Date:
July 05, 2018
Filing Date:
December 25, 2017
Export Citation:
Assignee:
KYOCERA CORP (JP)
International Classes:
B23B51/00
Foreign References:
| JP2012529998A | 2012-11-29 | |||
| JP2012192514A | 2012-10-11 | |||
| JP2012529375A | 2012-11-22 | |||
| JP2016529124A | 2016-09-23 | |||
| JPH06320316A | 1994-11-22 | |||
| JP5940205B1 | 2016-06-29 |
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