Granted Patent B2

US 12,617,025 · App. 18/557,048 · Granted May 5, 2026

Inventors: Tomohito Shuto (Kyoto, JP); Yoshihito Ikeda (Kyoto, JP); Hirotoshi Gonzui (Kyoto, JP)

Assignee: KYOCERA CORPORATION

B23B29/025B23B27/002B23B29/043

Abstract

Claims (39)

1 . A cutting tool holder configured to receive a cutting insert, wherein the cutting tool holder comprising:

a body having a bar shape extending along a center axis from a first end surface to a second end surface, the body comprising a recess extending from the first end surface toward the second end surface;

a weight located in the recess;

an elastic member having a ring shape in contact with an inner peripheral surface of the recess; and

a lid press-fitted into the recess from a side of the first end surface, wherein

the inner peripheral surface of the recess comprises

a first region located on a side of the first end surface and being in contact with the lid; and

a second region located closer to the second end surface than the first region and being in contact with the elastic member,

the weight is fixed to the inner peripheral surface by the elastic member, and

a surface roughness of the second region is greater than a surface roughness of the first region.

2 . The cutting tool holder according to claim 1 , wherein

the lid comprises an outer peripheral surface configured to come into contact with the first region, and

a surface roughness of the outer peripheral surface is the same as the surface roughness of the first region.

3 . The cutting tool holder according to claim 1 , wherein

the body further comprises an outer surface, and

a surface roughness of the outer surface is equal to or less than the surface roughness of the first region.

4 . The cutting tool holder according to claim 1 , wherein

the second region comprises a groove having a spiral shape extending along the center axis.

5 . The cutting tool holder according to claim 4 , wherein

a depth of the groove is smaller than a dimension of the elastic member in a direction orthogonal to the center axis in a cross section along the center axis.

6 . The cutting tool holder according to claim 1 , wherein

an inner diameter of the recess in the second region is smaller than an inner diameter of the recess in the first region, and wherein

the recess further comprises a step located between the first region and the second region.

7 . A cutting tool comprising:

the cutting tool holder according to claim 1 ; and

a cutting insert located on a side of the first end surface in the holder.

8 . A method for manufacturing a machined product, the method comprising:

rotating a workpiece;

bringing a cutting tool into contact with the workpiece that is rotating, wherein the cutting tool comprises a cutting tool holder and a cutting insert, and the cutting tool holder comprises:

a body having a bar shape extending along a center axis from a first end surface to a second end surface, the body comprising a recess extending from the first end surface toward the second end surface;

a weight located in the recess;

an elastic member having a ring shape in contact with an inner peripheral surface of the recess; and

a lid press-fitted into the recess from a side of the first end surface, wherein

the inner peripheral surface of the recess comprises

a first region located on a side of the first end surface and being in contact with the lid; and

a second region located closer to the second end surface than the first region and being in contact with the elastic member,

the weight is fixed to the inner peripheral surface by the elastic member and

a surface roughness of the second region is greater than a surface roughness of the first region; and

separating the cutting tool from the workpiece.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (14)