Cutting insert and cutting tool having the same

Patent metadata

Field	Value
Publication number	US-10086447-B2
Application number	US-201515320444-A
Country	US
Kind code	B2
Filing date	Apr 29, 2015
Priority date	Jul 8, 2014
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

A cutting insert and a cutting tool having same are provided. The cutting insert includes an upper surface, a lower surface having a flat surface, side surfaces connecting to each of the upper surface and the lower surface, and cutting edges being formed by the upper surface and the side surfaces. A first cutting edge among the cutting edges is inclined downward. A major side surface among the side surfaces comprises a first major side surface connected to the upper surface so as to constitute the first cutting edge, and a second major side surface connected to the first major side surface and the lower surface. The first major side surface has a reversely positive surface, and the second major side surface has a reversely positive surface or a negative surface, and a minor side surface among the side surfaces has a positive surface or a negative surface.

First claim

What is claimed is:

1. A cutting insert, comprising:
an upper surface; a lower surface being a flat surface; side surfaces each connecting to the upper surface and the lower surface; and cutting edges being formed by the upper surface and the side surfaces,
wherein a first cutting edge among the cutting edges is inclined downward from one side which is a high portion to the other side which is a low portion,
a major side surface among the side surfaces comprises a first major side surface connected to the upper surface so as to constitute the first cutting edge, and a second major side surface connected to the first major side surface and the lower surface,
the first major side surface is a reversely positive surface, and the second major side surface is a reversely positive surface or a negative surface, and
a minor side surface among the side surfaces is a positive surface or a negative surface.

2. The cutting insert of claim 1 , wherein, when seen on a plan view, an angle formed by the minor side surface and the second major side surface each connected to the high portion H is less than 90 degrees.

3. The cutting insert of claim 1 , wherein, when the second major side surface is a reversely positive surface, the second major side surface is formed at a positive angle less than the first major side surface.

4. The cutting insert of claim 1 , wherein the second major side surface and the minor side surface are operated as a mounting surface when the cutting insert is mounted on a cutting tool.

5. The cutting insert of claim 1 , wherein a fastening hole provided for fastening with a cutting tool is formed by penetrating the second major side surfaces facing each other.

6. The cutting insert of claim 5 , wherein the upper surface is provided with rake surfaces inclined from the first cutting edge into the inside of the upper surface, and a projecting portion protruded upward between boundaries of the rake surfaces.

7. The cutting insert of claim 1 , wherein, when seen on a plan view, the cutting insert is in 180-degree rotational symmetry with reference to an intersection between a first imaginary line connecting a pair of the high portions opposed to each other, and a second imaginary line connecting a pair of the low portions opposed to each other.

8. The cutting insert of claim 7 , wherein the upper surface is inclined from the high portions toward the intersection.

9. The cutting insert of claim 8 , wherein the upper surface is composed of non-flat surface only.

10. A cutting tool on which the cutting insert as set forth in claim 9 is mounted,
wherein the cutting tool is provided with a mounting sheet surface where the cutting insert is mounted, and
the mounting sheet surface comprises a second major side surface sheet and a lower surface sheet surface each being in contact with, and having corresponding shapes to the second major side surface and the lower surface.

11. The cutting tool of claim 10 , wherein the second major side surface sheet surface and the lower surface sheet surface are flat surfaces.

12. A cutting tool on which the cutting insert as set forth in claim 8 is mounted,
wherein the cutting tool is provided with a mounting sheet surface where the cutting insert is mounted, and
the mounting sheet surface comprises a second major side surface sheet and a lower surface sheet surface each being in contact with, and having corresponding shapes to the second major side surface and the lower surface.

13. A cutting tool on which the cutting insert as set forth in claim 7 is mounted,
wherein the cutting tool is provided with a mounting sheet surface where the cutting insert is mounted, and
the mounting sheet surface comprises a second major side surface sheet and a lower surface sheet surface each being in contact with, and having corresponding shapes to the second major side surface and the lower surface.

14. A cutting tool on which the cutting insert as set forth in claim 6 is mounted,
wherein the cutting tool is provided with a mounting sheet surface where the cutting insert is mounted, and
the mounting sheet surface comprises a second major side surface sheet and a lower surface sheet surface each being in contact with, and having corresponding shapes to the second major side surface and the lower surface.

15. A cutting tool on which the cutting insert as set forth in claim 5 is mounted,
wherein the cutting tool is provided with a mounting sheet surface where the cutting insert is mounted, and
the mounting sheet surface comprises a second major side surface sheet and a lower surface sheet surface each being in contact with, and having corresponding shapes to the second major side surface and the lower surface.

16. A cutting tool on which the cutting insert as set forth in claim 4 is mounted,
wherein the cutting tool is provided with a mounting sheet surface where the cutting insert is mounted, and
the mounting sheet surface comprises a second major side surface sheet and a lower surface sheet surface each being in contact with, and having corresponding shapes to the second major side surface and the lower surface.

17. A cutting tool on which the cutting insert as set forth in claim 3 is mounted,
wherein the cutting tool is provided with a mounting sheet surface where the cutting insert is mounted, and
the mounting sheet surface comprises a second major side surface sheet and a lower surface sheet surface each being in contact with, and having corresponding shapes to the second major side surface and the lower surface.

18. A cutting tool on which the cutting insert as set forth in claim 2 is mounted,
wherein the cutting tool is provided with a mounting sheet surface where the cutting insert is mounted, and
the mounting sheet surface comprises a second major side surface sheet and a lower surface sheet surface each being in contact with, and having corresponding shapes to the second major side surface and the lower surface.

19. A cutting tool on which the cutting insert as set forth in claim 1 is mounted,
wherein the cutting tool is provided with a mounting sheet surface where the cutting insert is mounted, and
the mounting sheet surface comprises a second major side surface sheet and a lower surface sheet surface each being in contact with, and having corresponding shapes to the second major side surface and the lower surface.

Assignees

• Korloy Inc

Inventors

• Nam Ki-Chan
• Kim Young-Heum
• Lee Kane-Hee
• Kim Hyo-San

Classifications

• B23C5/202 Primary

  Plate-like cutting inserts with special form (special form related to securing of the insert B23C5/22) · CPC title

• B23C5/20

  with removable cutter bits or teeth {or cutting inserts} · CPC title

• B23C5/06 Primary

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

• B23C2200/284

  Negative clearance angles · CPC title

• B23C2210/045

  axial rake angle · CPC title