Cutting insert

Patent metadata

Field	Value
Publication number	US-11858050-B2
Application number	US-202217725315-A
Country	US
Kind code	B2
Filing date	Apr 20, 2022
Priority date	Apr 30, 2021
Publication date	Jan 2, 2024
Grant date	Jan 2, 2024

Abstract

It is intended to allow a wide range including a low region (fine finishing) to a middle region (medium cutting) to be covered with a single insert. A cutting insert includes an upper surface, a lower surface, a peripheral side surface, a cutting edge including a main cutting edge and a corner cutting edge, a corner portion, a projecting portion formed to extend from the corner portion toward a central axis and including a first projection and a second projection, a rake portion, and an inclined portion provided at the cutting edge. The inclined portion has a first inclined portion beginning at an intermediate point in the corner cutting edge, while the rake portion has a shape in which an angular degree of a rake angle gradually increases with distance from the corner portion.

First claim

What is claimed is:

1. A cutting insert comprising:
an upper surface serving as a first end surface;
a lower surface serving as a second end surface opposite to the upper surface and having a mounting surface to be brought into contact with a body of a cutting tool;
a peripheral side surface formed to connect the upper surface and the lower surface;
a cutting edge including a main cutting edge and a corner cutting edge, the main cutting edge and the corner cutting edge being formed at an intersecting edge between the upper surface and the peripheral side surface;
a projecting portion including a first projection formed to have an elongated shape elongated in a direction extending from a corner portion toward a central axis, the central axis extending through a center of the upper surface in a direction perpendicular to the lower surface, and having a top surface including a portion having a height decreasing with distance from the corner portion toward the central axis and a second projection extending from the first projection and having a top surface having a height increasing with distance from the first projection toward the central axis; and
a rake portion formed between the projecting portion and the cutting edge, wherein
the cutting edge has an inclined portion provided to extend from an intermediate point in the corner cutting edge such that a height of the cutting edge from the lower surface decreases with distance from the corner cutting edge,
the inclined portion includes a first inclined portion beginning at the intermediate point in the corner cutting edge, and
a rake angle of the rake portion increases with distance from the corner portion.

2. The cutting insert according to claim 1 , wherein the inclined portion further includes a second inclined portion connected to the first inclined portion and having a gradient larger than that of the first inclined portion.

3. The cutting insert according to claim 1 , wherein a portion of the rake portion adjacent to the corner portion forms a flat surface.

4. The cutting insert according to claim 1 , wherein a peak point of the first projection is higher than a cutting edge of the corner cutting edge.

5. The cutting insert according to claim 4 , wherein the first projection has a height gradually decreasing with distance from the peak point toward the central axis.

6. The cutting insert according to claim 1 , wherein a side portion of the second projection is formed in a multi-step shape.

7. The cutting insert according to claim 6 , wherein a portion of the second projection located between the top surface of the second projection and the rake portion is formed with a wall surface.

8. The cutting insert according to claim 7 , wherein the wall surface has a first-level wall surface rising from the rake portion and a second-level wall surface provided between the first-level wall surface and the top surface of the second projection.

9. The cutting insert according to claim 8 , wherein the first-level wall surface is formed such that a space, formed between the first-level wall surface and the rake portion so as to allow chip to flow, becomes smaller with distance from the corner portion.

Assignees

• Tungaloy Corp

Inventors

• Ida Takehiro

Classifications

• B23B27/1611 Primary

  characterised by having a special shape · CPC title

• B23B27/145

  characterised by having a special shape · CPC title

• B23B2200/0433

  rounded · CPC title

• B23B2200/081

  with projections · CPC title

• B23B27/00 Primary

  Tools for turning or boring machines (for drilling machines B23B51/00); Tools of a similar kind in general; Accessories therefor · CPC title