CUTTING INSERT AND INDEXABLE BALL END MILL

WIPO Patent Application WO/2020/039981

A1

A cutting insert (1) to be mounted on an insert mounting seat of an indexable ball end mill comprises a rake face (2) facing in the end mill rotation direction, a seating face (3) facing away from the rake face (2), and a flank face (4) extending around the rake face (2) and the seating face (3), wherein a cutting edge (5) including an arcuate cutting edge portion (5a) extending in a convex arc shape in a plan view as viewed from the direction opposite to the rake face (2), and an inner peripheral cutting edge portion (5c) that is continuous with the tip of the arcuate cutting edge portion (5a) and extends in the direction crossing the arcuate cutting edge portion (5a) at an obtuse angle in a plan view is formed at the intersection ridge line between the rake face (2) and the flank face (4), and the inner peripheral cutting edge portion (5c) is formed in a concave shape away from the seating face (3) after extending to the seating face (3) side following the separation from the tip of the arcuate cutting edge portion (5a) in a side view as viewed from the direction facing the flank face (4) continuous with the inner peripheral cutting edge portion (5c).

NAGAFUCHI KENJI (JP)
KIUCHI YASUHIRO (JP)
KOBAYASHI YOSHIYUKI (JP)

PCT/JP2019/031677

February 27, 2020

August 09, 2019

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MITSUBISHI HITACHI TOOL ENG LTD (JP)

B23C5/20; B23C5/10

WO2004082877A1

2004-09-30

JPS6452613U	1989-03-31
JPH11197933A	1999-07-27
JPS6426113U	1989-02-14
JPH0839326A	1996-02-13

MATSUNUMA Yasushi et al. (JP)

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