Invention Grant
- Patent Title: Drill and method for manufacturing machined product
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Application No.: US16473258Application Date: 2017-12-25
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Publication No.: US10882121B2Publication Date: 2021-01-05
- Inventor: Hironori Nishikoori
- Applicant: KYOCERA Corporation
- Applicant Address: JP Kyoto
- Assignee: KYOCERA Corporation
- Current Assignee: KYOCERA Corporation
- Current Assignee Address: JP Kyoto
- Agency: Viering, Jentschura & Partner MBB
- Priority: JP2016-250973 20161226
- International Application: PCT/JP2017/046366 WO 20171225
- International Announcement: WO2018/123937 WO 20180705
- Main IPC: B23B51/02
- IPC: B23B51/02

Abstract:
A drill according to a non-limiting aspect may have a body, a cutting edge, a rake face, and a groove. The cutting edge may have a curved chisel edge, a pair of first cutting edges, and a pair of second cutting edges. The second cutting edge may have a first portion extending from the chisel edge and a second portion extending from the first portion toward the first cutting edge. The rake face may 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 may be zero or a negative value. A second rake angle of the second region may be a negative value. An absolute value of the second rake angle may be greater than an absolute value of the first rake angle.
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