DRILL - MITSUBISHI MATERIALS CORP

Title:

DRILL

Document Type and Number:

WIPO Patent Application WO/2021/006115

Kind Code:

A1

Abstract:

In this drill: a main cutting blade (8) is formed on a tip side ridge section of a chip discharge groove (6) formed on the tip outer periphery of a drill body (1); a thinning blade (9) is formed on a tip side ridge section of a thinning section (7) having recessed a groove shape formed in the tip inner periphery of the chip discharge groove (6); when viewed from the twist direction of the chip discharge groove, the radius of the inscribing circle of the chip discharge groove falls within the range of 0.3xD2 to 0.7xD2 with respect to the diameter D2 of a second circle; in the thinning section (7), the radius (R2) of a thinning inscribing circle (C6) falls within the range of 0.3xd to 0.7xd with respect to the core thickness (d) when viewed in the thinning direction; and the ratio A/B between the ratio A=R1/D2 of a radius R1 to the diameter D2 and the ratio B=R2/d of the radius (R2) to the core thickness (d) fall within the range of 0.8 to 1.25.

Inventors:

SATOU AKIRA (JP)
KIMURA TOMOKI (JP)

Application Number:

PCT/JP2020/025667

Publication Date:

January 14, 2021

Filing Date:

June 30, 2020

Export Citation:

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Assignee:

MITSUBISHI MATERIALS CORP (JP)

International Classes:

B23B51/00; B23B51/02

Domestic Patent References:

WO2009054400A1	2009-04-30
WO2015025872A1	2015-02-26

Foreign References:

JP2006281407A	2006-10-19
JPS6268213A	1987-03-28
US20110170973A1	2011-07-14
JP2019127145A	2019-08-01
JPS618264B2	1986-03-13

Other References: