Cutting insert

Patent metadata

Field	Value
Publication number	US-11878352-B2
Application number	US-202117490300-A
Country	US
Kind code	B2
Filing date	Sep 30, 2021
Priority date	Sep 30, 2020
Publication date	Jan 23, 2024
Grant date	Jan 23, 2024

Abstract

A cutting insert is described. It has a cutting insert body with a central mounting section and at least one cutting edge. The cutting edge is wave-shaped and generally descending from an end section of the cutting edge towards a middle section of the cutting edge. Furthermore, a chip guiding recess extends substantially along the at least one cutting edge and is arranged between the cutting edge and the central mounting section. A chip breaker element is arranged in the chip guiding recess. The chip breaker element comprises a first portion having a first width and a second portion having a second width, wherein a transition between the first portion and the second portion is formed as a step.

First claim

The invention claimed is:

1. A cutting insert comprising a cutting insert body with a central mounting section and at least one cutting edge,
wherein the cutting edge is wave-shaped from an end section forming a corner portion to middle section of the cutting edge and a distance between the end section of the cutting edge and a top surface of the central mounting section is smaller than a distance between the middle section of the cutting edge and the top surface;
wherein a chip guiding recess extending along the at least one cutting edge is arranged between the cutting edge and the central mounting section and a chip breaker element is arranged in the chip guiding recess, and
wherein the chip breaker element comprises a first portion having a first width and a second portion having a second width, wherein a transition between the first portion and the second portion is formed as a step.

2. The cutting insert according to claim 1 , wherein the cutting edge comprises a plurality of linear cutting edge segments being provided at different heights with respect to the top surface of the central mounting section.

3. The cutting insert according to claim 2 , wherein neighboring linear cutting edge segments are connected by non-linear connecting segments, wherein the non-linear connecting segments tangentially merge into the neighboring linear cutting edge segments.

4. The cutting insert according to claim 1 , wherein the step comprises a substantially flat surface that is arranged in parallel to the top surface of the central mounting section.

5. The cutting insert according to claim 1 , wherein the chip breaker element comprises a top surface being substantially parallel to the top surface of the central mounting section.

6. The cutting insert according to claim 1 , wherein the chip breaker element comprises a top surface being inclined towards the central mounting section.

7. The cutting insert according to claim 1 , wherein the chip breaker element merges with the central mounting section.

8. The cutting insert according to claim 1 , wherein the chip breaker element is separated from the central mounting section by a gap.

9. The cutting insert according to claim 1 , wherein a rake angle (γ) varies over the length of the cutting edge.

10. The cutting insert according to claim 1 , wherein a coolant channel is arranged adjacent to the chip guiding recess or within the chip guiding recess.

11. The cutting insert according to claim 1 , characterized by an additional cutting edge, wherein the cutting edge and the additional cutting edge form neighboring edges of a polygon and intersect in a corner portion of the cutting insert.

12. The cutting insert according to claim 11 , wherein the chip breaker element is arranged in the corner portion.

13. The cutting insert according to claim 1 , wherein the cutting edge is rounded with a rounding radius (R), wherein a rounding radius (R) at a wave peak of the wave-shaped cutting edge is bigger than a rounding radius (R) at a wave base of the wave-shaped cutting edge.

14. The cutting insert according to claim 1 , wherein the cutting insert is an indexable cutting insert.

15. The cutting insert according to claim 12 , wherein the chip breaker element is arranged on an angle bisector of the cutting edge and the additional cutting edge.

16. The cutting insert of claim 4 , wherein the surface is arranged in parallel to the top surface of the central mounting section.

Assignees

• Kennametal Inc

Inventors

• Kaufmann Igor
• Nagarajan Sathish Kumar
• Soore Pradeep

Classifications

• B23B27/143 Primary

  characterised by having chip-breakers · CPC title

• B23B27/145

  characterised by having a special shape · CPC title

• B23B2200/205

  with cutting edge having a wave form · CPC title

• B23B2200/28

  Angles · CPC title

• B23B2200/32

  Chip breaking or chip evacuation · CPC title