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Japanese Patent JP7001844

B2

A three-flute drill (1) includes a body (3), discharge grooves (4), cutting edges (5), thinning edges (7) and gash portions (8). The body (3) extends along a shaft center (AX). The discharge grooves (4) are provided in an outer peripheral surface (31) of the body (3). The cutting edges (5) are provided on ridge sections between inner faces (41) of the discharge grooves (4) and flanks (6) of the body (3). The thinning edge (7) extends from an end (51) of the cutting edge (5) toward a radially inner side. The gash portion (8) includes an R portion (81) and a straight portion (82). A first ridge line (811) between the R portion (81) and the flank (6) extends while curving toward a rotation direction (R), from an end (71) of the thinning edge (7) toward a radially outer side. A second ridge line (821) between the straight portion (82) and the flank (6) extends linearly from an end (812) of the first ridge line (811) toward the radially outer side, and connects to the discharge groove (4) further to the radially inner side than the outer peripheral surface (31).

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Takehiro Yamamoto
Hiroyasu Makino

JP2020562786A

January 20, 2022

August 30, 2019

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OSG Co., Ltd.

B23B51/00

JP2015131384A
JP7308814A
JP10058291A
JP2016059999A
JP2017042879A
JP2017164836A
JP2009148865A

WO2019049257A1
WO2013065201A1
WO2014208421A1

Yamamoto Takashi
Daiki Hiramatsu

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