Invention Grant
- Patent Title: Indexable drill and method for arranging inserts in the drill
- Patent Title (中): 可转位钻头和钻头插入件的安装方法
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Application No.: US12520338Application Date: 2007-12-21
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Publication No.: US08388278B2Publication Date: 2013-03-05
- Inventor: Kazuchika Nasu , Atsuhiko Maeta
- Applicant: Kazuchika Nasu , Atsuhiko Maeta
- Applicant Address: JP Hyogo
- Assignee: Sumitomo Electric Hardmetal Corp.
- Current Assignee: Sumitomo Electric Hardmetal Corp.
- Current Assignee Address: JP Hyogo
- Agency: Ditthavong Mori & Steiner, P.C.
- Priority: JP2006-347335 20061225; JP2007-098150 20070404
- International Application: PCT/JP2007/074700 WO 20071221
- International Announcement: WO2008/078696 WO 20080703
- Main IPC: B23B51/02
- IPC: B23B51/02

Abstract:
An indexable drill which has cutting edges formed of a plurality of indexable inserts and which provides stable performance so that the accuracy of entrance hole diameter and exit hole diameter is improved and generation of burrs at the hole exit can be suppressed. Indexable inserts which form a center cutting edge and a peripheral cutting edge are attached to a drill main body at an end thereof. A ratio between a cutting contribution of the center cutting edge and a cutting contribution of the peripheral cutting edge is set such that the cutting contribution of the center cutting edge is larger. The indexable insert is disposed so at to project forward in the axial direction from the indexable insert so that an outer-end corner of the peripheral cutting edge engages a workpiece first.
Public/Granted literature
- US20100034606A1 THROW-AWAY DRILL AND TIP ARRANGEMENT METHOD FOR THE DRILL Public/Granted day:2010-02-11
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