DRILL - OSG CORP

Title:

DRILL

Document Type and Number:

WIPO Patent Application WO/2013/035166

Kind Code:

A1

Abstract:

Provided is a drill, the tool life of which is improved by obtaining swarf shapes that curl and do not have needle-shaped protrusions, and thereby have shorter overall length, and by the evacuation thereof being facilitated. Because a first convex curve (CL1) corresponding to the convex cutting edge (12a) and a first concave curve (CL2) corresponding to the concave cutting edge (12b) intersect with each other at an intersection point (A) in a cross-section of the drill (10) that is orthogonal to the shaft center (C), the swarf generated from the cutting edge (12) has a shape that curls and does not have needle-shaped protrusions, and thereby has a relatively short overall length. Because the evacuation thereof is facilitated and evacuating ability is increased, the tool life of the drill (10) is improved.

Inventors:

TAKAI KAZUTERU (JP)
ITOH KAZUTOYO (JP)
AMANO HIROYUKI (JP)

Application Number:

PCT/JP2011/070296

Publication Date:

March 14, 2013

Filing Date:

September 06, 2011

Export Citation:

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Assignee:

OSG CORP (JP)
TAKAI KAZUTERU (JP)
ITOH KAZUTOYO (JP)
AMANO HIROYUKI (JP)

International Classes:

B23B51/00

Domestic Patent References:

WO2010038279A1

2010-04-08

Foreign References:

JP2003025125A	2003-01-29
JPS6389211A	1988-04-20
JP2000198011A	2000-07-18
JP2006326790A	2006-12-07
JP2003025125A	2003-01-29

Other References: