RADIUS END MILL, MACHINE TOOL USING SAME, AND DESIGNING METHOD AND MACHINING METHOD FOR RADIUS END MILL

WIPO Patent Application WO/2019/203043

A1

Provided is a radius end mill in which chattering vibration is suppressed to improve machining stability. A radius end mill (1) is provided with a circular arc edge (5) provided on the outer peripheral side of the front end (4) of the tool body (3). In a longitudinal cross-section including the center axis of the tool body (3), a nose (R) angle (θr) which defines an angular range in which the circular arc edge (5) is formed is set to be 30º or less. In the longitudinal cross-section, the circular arc edge (5) is formed as a circular arc edge for bottom surface, which extends to a side surface (4b) from a position (P1) which is located on the bottom surface (4a) of the front end (4) of the tool body (3) and through which a tangential line in a direction perpendicular to the center axis passes. A nose (R) height (Hr) which is the dimension of the circular arc edge (5) in the direction of the center axis is set to be 0.75 mm or less.

SHAMOTO EIJI (JP)
ETO JUN (JP)
KITANO AKIRA (JP)
SUGIHARA TOMOMI (JP)

PCT/JP2019/015289

October 24, 2019

April 08, 2019

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MITSUBISHI HEAVY IND LTD (JP)
UNIV NAGOYA NAT UNIV CORP (JP)

B23C5/10

US20160271706A1	2016-09-22
US20050025584A1	2005-02-03
JP2007038344A	2007-02-15
JP2003323204A	2003-11-14
JP2006212744A	2006-08-17
JP2013176842A	2013-09-09

EIJI SHAMOTO: "Mechanism and Suppression of Chatter vibrations in Cutting", DENKISEIKO, vol. 82, no. 2, 2011, pages 143 - 155
See also references of EP 3736070A4

FUJITA, Takaharu (JP)

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