DRILL INSERT AND INDEXABLE DRILL - MITSUBISHI MATERIALS CORP

Title:

DRILL INSERT AND INDEXABLE DRILL

Document Type and Number:

WIPO Patent Application WO/2015/098646

Kind Code:

A1

Abstract:

The purpose of the invention is to ensure sufficient chipping resistance for large cutting loads, cutting resistance, and welding. Provided is a drill insert that is removably mounted to the distal end of a drill body that is rotated around an axis, wherein: the polygon face of a polygonal plate-shaped insert body (1) is a rake face (2), a side face disposed around the rake face (2) is a flank face (3), and a cutting blade (4) is formed on the ridge where the rake face (2) and the flank face (3) intersect; the cutting blade (4) has a honing face (9) that gradually rises from the flank face (3) toward the rake face (2) and that is formed on a first cutting portion (4A) continuous with at least one edge of the cutting blade (4); the honing face (9) comprises a first convex curved face (9A) continuous with the rake face (2) and a second convex curved face (9B) continuous with the flank face (3); and in a cross section perpendicular to the cutting blade (4), the radius of curvature (R1) of the first convex curved face (9A) is larger than the radius of curvature (R2) of the second convex curved face (9B).

Inventors:

SATO TAKAHIRO (JP)
HAYASHIZAKI HIROAKI (JP)

Application Number:

PCT/JP2014/083386

Publication Date:

July 02, 2015

Filing Date:

December 17, 2014

Export Citation:

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Assignee:

MITSUBISHI MATERIALS CORP (JP)

International Classes:

B23B51/00

Foreign References:

JP2012171040A	2012-09-10
JP2009178787A	2009-08-13
US5771763A	1998-06-30
JP2012525987A	2012-10-25
JPH10315023A	1998-12-02
JP2008080483A	2008-04-10
JP3022002B2	2000-03-15
JP4394180B2	2010-01-06

Other References: