DRILL TIP AND DRILL BIT - MITSUBISHI MATERIALS CORP

Title:

DRILL TIP AND DRILL BIT

Document Type and Number:

WIPO Patent Application WO/2016/114344

Kind Code:

A1

Abstract:

In the drill tip of the present invention, the tip body of the drill tip has a cylindrical or disc-shaped rear end part, an intermediate part having a smaller outside diameter than that of the rear end part, and a leading end part in which the outer diameter gradually decreases from the centerline of the tip toward the leading end. The tip body is covered by a hard layer from the surface of the leading end part of the tip body to the outer periphery of the intermediate part. The outside diameter of the hard layer at the intermediate part is equal to the outside diameter of the rear end part.

More Like This:

WO/1992/005335	SELF-SHAPING DRILL CUTTING EDGE
WO/1999/006667	CLAW TOOTH ROTARY BIT

Inventors:

AKHMADI EKO WARDOYO (JP)
MATSUO TOSHIHIKO (JP)
SAKURAZAWA CHIHIRO (JP)

Application Number:

PCT/JP2016/050973

Publication Date:

July 21, 2016

Filing Date:

January 14, 2016

Export Citation:

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Assignee:

MITSUBISHI MATERIALS CORP (JP)

International Classes:

E21B10/56; E21B10/52

Foreign References:

US5379854A	1995-01-10
JPS6299083A	1987-05-08
JPH0633677A	1994-02-08
JPH0446183U	1992-04-20

Other References: