公开(公告)号：US20220347761A1

公开(公告)日：2022-11-03

申请号：US17656534

申请日：2022-03-25

Applicant: TUNGALOY CORPORATION

Inventor： Yuma KONDOU ,  Jun OTSUKA ,  Katsura MOCHIZUKI

IPC: B23B27/16

Abstract: To provide a cutting insert such that a tool body can sufficiently hold the cutting insert even if one of cutting parts is broken. The cutting insert includes two side surfaces opposed to each other, a fixing hole passing through the centers of the two side surfaces, and an outer circumferential surface that is disposed between the outer circumferential edges of the two side surfaces and are connected to the outer circumferential edges of the two side surfaces. The outer circumferential surface includes four cutting parts, a first outer circumferential surface part that is disposed between the first cutting part and the second cutting part, and a second outer circumferential surface part that is opposed to the first outer circumferential surface part and is disposed between the third cutting part and the fourth cutting part. In a side view of the side surfaces from the axial direction of the fixing hole, the first outer circumferential surface part and the second outer circumferential surface part each have the center recessed toward the fixing hole, and a virtual arc having the same diameter as the diameter of the circumcircle of the cutting insert is in contact with two points on each of the outer circumferential surface parts.

公开(公告)号：US20240109133A1

公开(公告)日：2024-04-04

申请号：US18450235

申请日：2023-08-15

Applicant: TUNGALOY CORPORATION ,  ISCAR LTD.

Inventor： Yuma KONDOU ,  Sergey CHISTYAKOV ,  Dima MAKHLIN

IPC: B23B27/16 ,  B23B31/00

CPC classification number: B23B27/1614 ,  B23B31/005 ,  B23B2231/0204

Abstract: A head replaceable cutting tool having a structure that can limit a machining cost when a clearance portion is formed in a portion at which a head is attached and detached, and also limit deformation of a shank is provided. The head replaceable cutting tool includes: a projection portion or a hole portion for attachment and detachment disposed in a head; a shank to which the head is attachable; a hole portion, to which the projection portion is removably attachable along a central axis, or a projection portion disposed in an end portion of the shank; a fastening member that presses the projection portion toward an inner circumference surface of the hole portion; and a fastened portion disposed in the shank to fasten the fastening member. The hole portion has a transverse cross-sectional shape that is a substantially circular shape having a curvature radius R1, and the projection portion has a transverse cross-sectional shape including a contact portion at which an outer circumference surface of the projection portion is in contact with the inner circumference surface of the hole portion and a clearance portion that is formed in a part of the outer circumference surface so as to deviate radially inward from a virtual circle corresponding to the inner circumference surface and does not come into contact with the inner circumference surface.

公开(公告)号：US20190118275A1

公开(公告)日：2019-04-25

申请号：US16132589

申请日：2018-09-17

Applicant: TUNGALOY CORPORATION

Inventor： Yuki OIKAWA ,  Yuma KONDOU

IPC: B23C5/20 ,  B23C5/22

Abstract: The present invention provides a cutting insert 10 which is mounted on an indexable rotating tool E comprising a body B that rotates about a predetermined rotational axis AX. The cutting insert 10 comprises an upper surface 10a, a lower surface 10b and a peripheral side surface. The cutting insert 10 further comprises an inner cutting edge 10g and a corner cutting edge 10f. A top part S, which has the maximum distance from the lower surface 10b, is located on the corner cutting edge 10f.