US 12,103,093 B2
Radius endmill and machine tool using the same, and designing method and machining method of radius endmill
Eiji Shamoto, Aichi (JP); Jun Eto, Tokyo (JP); Akira Kitano, Tokyo (JP); and Tomomi Sugihara, Aichi (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP); and NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEM, Nagoya (JP)
Appl. No. 16/968,658
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP); and NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEM, Nagoya (JP)
PCT Filed Apr. 8, 2019, PCT No. PCT/JP2019/015289
§ 371(c)(1), (2) Date Aug. 10, 2020,
PCT Pub. No. WO2019/203043, PCT Pub. Date Oct. 24, 2019.
Claims priority of application No. 2018-078299 (JP), filed on Apr. 16, 2018.
Prior Publication US 2020/0406378 A1, Dec. 31, 2020
Int. Cl. B23C 5/10 (2006.01)
CPC B23C 5/10 (2013.01) 6 Claims
OG exemplary drawing
 
1. A radius endmill comprising:
a tool body having
a bottom surface at a distal end portion thereof,
a side surface, and
a bottom circular arc edge provided on the bottom surface at an outer periphery thereof,
wherein the bottom circular arc edge is formed starting from a first position defined at a first corner point in the bottom surface forming a tangential line and perpendicularly intersecting a central axis line of the tool body, and terminating on a second position at a second corner point intersecting with the side surface of the tool body, in a vertical section including the central axis line, in which the bottom circular arc edge forms a discontinued radius of curvature interrupted at the intersection with the side surface, and
an angular range of the bottom circular arc edge from the first position in the bottom surface to the second position intersecting with the side surface is equal to or less than 30° in the vertical section.