公开(公告)号：US11407047B2

公开(公告)日：2022-08-09

申请号：US16973612

申请日：2019-04-03

Applicant: A.L.M.T. Corp.

Inventor： Sakuya Tanaka ,  Koji Sawa

IPC: B23D77/02

Abstract: A reamer includes a core, a plurality of outer-circumference cutting edges provided on an outer circumference of the core and made of a hard tool material, and a margin provided on a rear side of each the plurality of outer-circumference cutting edges in a rotational direction. A distance from an axis of rotation to a position of a center of gravity of the reamer is greater than 0.01 mm and not greater than 0.5 mm.

公开(公告)号：US11724323B2

公开(公告)日：2023-08-15

申请号：US16973716

申请日：2019-04-03

Applicant: A.L.M.T. Corp.

Inventor： Sakuya Tanaka ,  Koji Sawa

IPC: B23D77/00 ,  B23D77/02

CPC classification number: B23D77/00 ,  B23D77/02 ,  B23D2277/105 ,  B23D2277/72

Abstract: A reamer incudes 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 extends from a front end to a rear end. The core is provided with a plurality of flutes from the front end to the rear end. A center-of-gravity adjustment portion, which adjusts a distance from a center of rotation to a center of gravity, is provided at least partially from terminal ends of the plurality of flutes on a rear end side to the rear end of the core. The center-of-gravity adjustment portion causes the deviation of the center of gravity from the center of rotation to be smaller than when no center-of-gravity adjustment portion is provided.