公开(公告)号：US12172220B2

公开(公告)日：2024-12-24

申请号：US17429018

申请日：2020-02-07

Applicant: NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEM ,  NTK CUTTING TOOLS CO., LTD.

Inventor： Eiji Shamoto ,  Takashi Ueda

IPC: B23B27/10 ,  B23B27/16

Abstract: A structure for cooling a rake face of a cutting insert in a region near a tip of a cutting edge. The cutting insert includes a rake face, a cutting edge formed on an outer periphery of the rake face, a base portion that supports the rake face, and an internal cooling path through which fluid for cooling the rake face flows. The internal cooling path includes an introduction flow path and a cooling flow path, and the cooling flow path is disposed behind a region in which a chip of a workpiece comes into contact with rake face. The cooling flow path is provided at a depth of less than or equal to 1.5 mm from the rake face.

公开(公告)号：US20240300027A1

公开(公告)日：2024-09-12

申请号：US18598521

申请日：2024-03-07

Applicant: NTK CUTTING TOOLS CO., LTD.

Inventor： Kanshi Kushibiki ,  Ryoji Toyoda

IPC: B23B27/14

CPC classification number: B23B27/148 ,  B23B2226/18 ,  B23B2226/31 ,  B23B2228/10

Abstract: Provided is a diamond coating cutting tool in which the adhesiveness of a diamond layer to a base material is high.
A diamond coating cutting tool 1 includes a base material 3 made of a silicon nitride sintered body or a sialon sintered body, and a diamond layer 7 coated on a surface of the base material 3. In the base material 3, an average thermal expansion coefficient x at 25° C. to 600° C. satisfies 2.6×10−6/K≤x≤4.0×10−6/K, and the diamond layer 7 has a compressive residual stress of 50 MPa or more and 1800 MPa or less.

公开(公告)号：US20240189937A1

公开(公告)日：2024-06-13

申请号：US18285965

申请日：2022-04-07

Applicant: NTK CUTTING TOOLS CO., LTD. ,  Osaka University

Inventor： Yuki Takeuchi ,  Jun Moteki ,  Hiroki Takeuchi ,  Yusuke Katsu ,  Yasushi Hara ,  Hidetoshi Fujii ,  Yoshiaki Morisada

IPC: B23K20/12 ,  B23K101/18

CPC classification number: B23K20/1255 ,  B23K2101/18

Abstract: A friction stir welding tool and a friction stir welding method that can increase the amount of heat generation, while reducing the amount of escaping heat are provided. The friction stir welding tool (1) has a shoulder portion (7) and a probe portion (5) provided on a bottom surface of the shoulder portion (7) . The base material of the friction stir welding tool (1) is a ceramic material whose main phase is silicon nitride or sialon. The shoulder portion (7) has a diameter of 35 mm or greater.