DRILL - MITSUBISHI MATERIALS CORP

Title:

DRILL

Document Type and Number:

WIPO Patent Application WO/2020/213482

Kind Code:

A1

Abstract:

In this drill, a cutting blade (3), which is formed in an intersecting ridge line portion between a wall surface (5A), facing a drill rotation direction (T), of a chip discharging groove (5) formed on an outer periphery of a tip end portion of a drill main body (1) that is rotated about an axial line (O), and a tip end flank face (4), is provided with: an inner peripheral cutting blade (3A) positioned on a radially inner peripheral side with respect to the axial line (O); and an outer peripheral cutting blade (3B) continuous with a radially outer peripheral side of the inner peripheral cutting blade (3A). With regard to the inner peripheral cutting blade (3A), an inner peripheral side portion with respect to the axial line (O) has a tip end angle (θA) within a range from 90° to 170°. With regard to the outer peripheral cutting blade (3B), a radial width with respect to the axial line (O) of a rotational trajectory around the axial line (O) in a cross section along the axial line (O) is within a range from 5% to 20% of a diameter (D) of the cutting blade (3), and a tip end angle (θB) is greater than the tip end angle (θA) of the inner peripheral cutting blade (3A).

Inventors:

YAMAMOTO TADASHI (JP)
HIBI TAKAHIRO (JP)

Application Number:

PCT/JP2020/015700

Publication Date:

October 22, 2020

Filing Date:

April 07, 2020

Export Citation:

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Assignee:

MITSUBISHI MATERIALS CORP (JP)

International Classes:

B23B51/00

Domestic Patent References:

WO2012095479A1

2012-07-19

Foreign References:

US5273380A	1993-12-28
JP2009028895A	2009-02-12
JP2014516813A	2014-07-17
JP2012161912A	2012-08-30
JP2009502538A	2009-01-29
JP2019078605A	2019-05-23
JP2011104751A	2011-06-02

Other References: