Cutting insert, metal spacer and holder

Patent metadata

Field	Value
Publication number	US-10654116-B2
Application number	US-201816146020-A
Country	US
Kind code	B2
Filing date	Sep 28, 2018
Priority date	Oct 25, 2017
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A cutting insert comprising a cutting tip and a base insert on which the cutting tip is mounted, the cutting insert being provided with a passage PA which is formed along a boundary surface between the cutting tip and the base insert so as to extend from a boundary part, in an upper surface of the cutting insert, between the cutting tip and the base insert to another boundary part, in a lower surface of the cutting insert, between the cutting tip and the base insert.

First claim

What is claimed is:

1. A cutting insert comprising:
a base insert comprising a first upper surface, a first lower surface and a first side surface connecting the first upper surface and the first lower surface; and
a cutting tip comprising a second upper surface, a second lower surface and a second side surface connecting the second upper surface and the second lower surface, wherein:
the first side surface comprises:
a first mounting surface; and
a first peripheral side surface connected to the first upper surface, the first lower surface and the first mounting surface;

the second side surface comprises:
a second mounting surface opposing the first mounting surface, the second mounting surface including a second passage surface; and
a second peripheral side surface which is connected to the second upper surface, the second lower surface and the second mounting surface and in which at least an edge connected to the second upper surface is provided with a first cutting edge;

the first mounting surface comprises:
a first securing surface fixed to the second mounting surface; and
a first passage surface opposing the second mounting surface; and

the first passage surface and the second passage surface form a passage in communication with the second upper surface and the second lower surface to thereby allow coolant for cooling the cutting tip to pass therethrough.

2. The cutting insert according to claim 1 , wherein the second surface is, in a plan view seen from a direction facing the second upper surface, in line symmetry with respect to a line passing through the edge.

3. The cutting insert according to claim 2 , wherein, a boundary line, being a boundary between the first upper surface and the first mounting surface, includes, in a plan view seen from a direction facing the first upper surface, a point which has a maximum distance, in a direction of the line, with respect to an intersection between the line and the second peripheral side surface, such point being respectively located between an intersection between the boundary line and the line, and each of two end points of the boundary line.

4. The cutting insert according to claim 1 , wherein a second edge connecting the second peripheral side surface and the second lower surface is provided with a second cutting edge.

5. The cutting insert according to claim 4 , wherein the second lower surface is, in a plan view seen from a direction facing the second lower surface, in line symmetry with respect to a second line passing through the second edge.

6. The cutting insert according to claim 5 , wherein, a second boundary line, being a boundary between the first lower surface and the first mounting surface, includes, as seen from a direction facing the first lower surface, a point which has a maximum distance, in a direction of the second line, with respect to an intersection between the second line and the second peripheral side surface, such point being respectively located between a second intersection, being an intersection between the second boundary line and the second line, and each of two end points of the second boundary line.

7. The cutting insert according to claim 1 , wherein the first securing surface is included in a plane perpendicular to the first upper surface or the first lower surface.

8. The cutting insert according to claim 7 , wherein the first passage surface comprises a surface recessed with respect to the first securing surface in a direction away from the cutting tip.

9. The cutting insert according to claim 1 , wherein the passage comprises, in a plan view seen from a direction facing the first upper surface:
a first passage part which starts from a boundary between the first upper surface and the second upper surface and travels in a direction away from the cutting tip;
a second passage part which is connected to the first passage part and travels in a direction of the first lower surface; and
a third passage part which is connected to the second passage part and travels in a direction toward the cutting tip so as to be connected to a boundary between the first lower surface and the second lower surface.

10. The cutting insert according to claim 1 , wherein the second upper surface comprises:
a first flat part; and
a first guiding surface which is recessed with respect to the first flat part in a direction of the second lower surface so as to be connected to the passage.

11. The cutting insert according to claim 10 , wherein a surface of the first guiding surface is provided with irregularities in a direction perpendicular to a flow direction of the coolant.

12. The cutting insert according to claim 1 , wherein the first peripheral side surface comprises at least one side surface part facing toward the first upper surface, in an intermediate part between the first upper surface and the first lower surface.

13. A metal spacer for being arranged between a holder for holding the cutting insert according to claim 1 and the cutting insert, the metal spacer comprising:
a first through hole provided so as to fix the cutting insert to the holder with the use of a screw; and
a coolant passage provided so as to guide the coolant into the passage.

14. A holder for holding the cutting insert according to claim 1 , the holder comprising:
fixation means for fixing the cutting insert; and
a supply port for guiding the coolant.

Assignees

• Tungaloy Corp

Inventors

• Kawasaki Sozo

Classifications

• B23B2226/315

  polycrystalline [PCD] · CPC title

• B23B2205/16

  Shims · CPC title

• B23C5/06 Primary

  Face-milling cutters, i.e. having only or primarily a substantially flat cutting surface · CPC title

• B23B2226/125

  cubic [CBN] · CPC title

• B23B2240/08

  Brazed connections · CPC title