Title:
ドリル
Document Type and Number:
Japanese Patent JP6722410
Kind Code:
B2
Abstract:
A drill including: a chip discharge groove formed in an outer periphery of an edge portion serving as a leading end side portion of a drill body; and a cutting edge formed in an intersecting edge between a rake surface of a leading end side region and a leading end flank of the edge portion. The drill having a margin portion, a shoulder portion and a web thinning portion. The cutting edge includes, in order from a rotation center, first cutting edge, second cutting edge, shoulder cutting edge, and margin cutting edge portions. Honing widths of the second cutting edge, the margin cutting edge, and the shoulder cutting edge portions satisfy a relation represented by expression (1), as follows: honing width of the shoulder cutting edge portion>honing width of the margin cutting edge portion≥honing width of the second cutting edge portion.
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Inventors:
Takao Katagiri
Application Number:
JP2018108401A
Publication Date:
July 15, 2020
Filing Date:
June 06, 2018
Export Citation:
Assignee:
Tungaloy Co., Ltd.
International Classes:
B23B51/00; B23B27/14
Domestic Patent References:
| JP2004268230A | ||||
| JP4608933B2 | ||||
| JP2014018883A | ||||
| JP2000167706A | ||||
| JP2008142800A |
Foreign References:
| WO2016043098A1 | ||||
| EP3195967A1 | ||||
| US6585460 |
Attorney, Agent or Firm:
Yoshiyuki Inaba
Toshifumi Onuki
Akihiko Eguchi
Kazuhiko Naito
Toshifumi Onuki
Akihiko Eguchi
Kazuhiko Naito