Boring tool holder and turning tool

Patent metadata

Field	Value
Publication number	US-12202052-B2
Application number	US-202017610699-A
Country	US
Kind code	B2
Filing date	Apr 23, 2020
Priority date	May 15, 2019
Publication date	Jan 21, 2025
Grant date	Jan 21, 2025

Abstract

A boring tool holder has a base member and a cutting insert holding member. The base member has a first main surface and a second main surface opposite to the first main surface. The cutting insert holding member is contiguous to the base member on the first main surface, and disposed in a circumferential direction of the base member as viewed in a direction from the first main surface toward the second main surface. A cross-sectional area of the base member in a cross section perpendicular to the direction from the first main surface toward the second main surface and intersecting the base member is larger than a cross-sectional area of the cutting insert holding member in a cross section perpendicular to the direction from the first main surface toward the second main surface and intersecting the cutting insert holding member.

First claim

The invention claimed is:

1. A boring tool holder comprising:
a base member having a first main surface and a second main surface opposite to the first main surface; and
a cutting insert holding member contiguous to the base member on the first main surface, and disposed in a circumferential direction of the base member as viewed in a direction from the first main surface toward the second main surface,
a cross-sectional area of the base member in a cross section perpendicular to the direction from the first main surface toward the second main surface and intersecting the base member being larger than a cross-sectional area of the cutting insert holding member in a cross section perpendicular to the direction from the first main surface toward the second main surface and intersecting the cutting insert holding member, wherein
the base member has a first external circumferential surface that is continuous to each of the first main surface and the second main surface,
the first external circumferential surface has a curved surface,
the curved surface of the first external circumferential surface is arcuate when viewed in the direction from the first main surface toward the second main surface, and
the cutting insert holding member is disposed in a circumferential direction of the curved surface of the first external circumferential surface.

2. The boring tool holder according to claim 1 , further comprising a shank member contiguous to the base member on the second main surface, wherein
the shank member is disposed without overlapping the cutting insert holding member as viewed in the direction from the first main surface toward the second main surface.

3. The boring tool holder according to claim 2 , wherein the cutting insert holding member has a distal end surface located on a side opposite to the first main surface.

4. The boring tool holder according to claim 3 , wherein the distal end surface has a circumferential angle of 45° or larger and 180° or smaller as viewed in the direction from the first main surface toward the second main surface.

5. The boring tool holder according to claim 1 , wherein the cutting insert holding member has a distal end surface located on a side opposite to the first main surface.

6. The boring tool holder according to claim 5 , wherein the distal end surface has a circumferential angle of 45° or larger and 180° or smaller as viewed in the direction from the first main surface toward the second main surface.

7. The boring tool holder according to claim 6 , wherein
the cutting insert holding member has a first side end surface contiguous to the distal end surface, and
a distance of the first side end surface to the first main surface decreases from a boundary between the distal end surface and the first side end surface towards a boundary between the first main surface and the first side end surface in the circumferential direction of the base member.

8. The boring tool holder according to claim 7 , wherein
the cutting insert holding member is provided with a cutting insert receiving recess, and
the first side end surface is arcuate when the cutting insert holding member is viewed in a direction perpendicular to the direction from the first main surface toward the second main surface and parallel to a bottom surface of the cutting insert receiving recess.

9. The boring tool holder according to claim 5 , wherein
the cutting insert holding member has a first side end surface contiguous to the distal end surface, and
a distance of the first side end surface to the first main surface decreases from a boundary between the distal end surface and the first side end surface towards a boundary between the first main surface and the first side end surface in the circumferential direction of the base member.

10. The boring tool holder according to claim 9 , wherein
the cutting insert holding member is provided with a cutting insert receiving recess, and
the first side end surface is arcuate when the cutting insert holding member is viewed in a direction perpendicular to the direction from the first main surface toward the second main surface and parallel to a bottom surface of the cutting insert receiving recess.

11. A turning tool comprising:
the boring tool holder according to claim 1 ; and
a cutting insert attached to the cutting insert holding member.

12. The turning tool according to claim 11 :
wherein the boring tool holder further comprising a shank member contiguous to the base member on the second main surface, wherein
the shank member is disposed without overlapping the cutting insert holding member as viewed in the direction from the first main surface toward the second main surface.

13. The turning tool according to claim 10 ,
wherein the cutting insert holding member has a distal end surface located on a side opposite to the first main surface.

14. The turning tool according to claim 13 , wherein the distal end surface has a circumferential angle of 45° or larger and 180° or smaller as viewed in the direction from the first main surface toward the second main surface.

15. The turning tool according to claim 13 , wherein
the cutting insert holding member has a first side end surface contiguous to the distal end surface, and
a distance of the first side end surface to the first main surface decreases from a boundary between the distal end surface and the first side end surface towards a boundary between the first main surface and the first side end surface in the circumferential direction of the base member.

16. The turning tool according to claim 15 , wherein
the cutting insert holding member is provided with a cutting insert receiving recess, and
the first side end surface is arcuate when the cutting insert holding member is viewed in a direction perpendicular to the direction from the first main surface toward the second main surface and parallel to a bottom surface of the cutting insert receiving recess.

Assignees

• Sumitomo Electric Hardmetal Corp

Inventors

• Tohkairin Hitoshi

Classifications

• B23B29/03

  Boring heads · CPC title

• B23B27/02

  Cutting tools with straight main part and cutting edge at an angle (B23B27/04 - B23B27/08 take precedence) · CPC title

• B23B2220/126

  Producing ring grooves · CPC title

• B23B27/14

  Cutting tools of which the bits or tips {or cutting inserts} are of special material · CPC title

• B23B29/025 Primary

  Boring toolholders fixed on the boring bar · CPC title