US 11,724,323 B2
Reamer
Sakuya Tanaka, Kato (JP); and Koji Sawa, Kato (JP)
Assigned to A.L.M.T. CORP., Tokyo (JP)
Appl. No. 16/973,716
Filed by A.L.M.T. Corp., Tokyo (JP)
PCT Filed Apr. 3, 2019, PCT No. PCT/JP2019/014770
§ 371(c)(1), (2) Date Dec. 9, 2020,
PCT Pub. No. WO2020/003679, PCT Pub. Date Jan. 2, 2020.
Claims priority of application No. 2018-123495 (JP), filed on Jun. 28, 2018.
Prior Publication US 2021/0245276 A1, Aug. 12, 2021
Int. Cl. B23D 77/00 (2006.01); B23D 77/02 (2006.01)
CPC B23D 77/00 (2013.01) [B23D 77/02 (2013.01); B23D 2277/105 (2013.01); B23D 2277/72 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A reamer comprising: a core; and a plurality of outer-circumference cutting edges provided on an outer circumference of the core and made of a hard tool material, the core extending from a front end to a rear end, the core being provided with a plurality of flutes extending from the front end toward the rear end, a center-of-gravity adjustment portion being provided at least partially from terminal ends of the plurality of flutes on a rear end side toward the rear end of the core, the center-of-gravity adjustment portion causing the distance from the center of rotation to the center of gravity to be smaller than when the center-of-gravity adjustment portion is not provided, wherein the center-of-gravity adjustment portion is a lightened portion provided at a terminal end of one of the plurality of flutes, the lightened portion being a material reduction of a portion of the core.