ROUND CUTTING INSERT WITH CHIP CONTROL FEATURE
A round cutting insert includes a bottom surface, a clearance side surface and a top surface. The top surface includes a chip control feature in the form of a continuous, circumferential depression formed by a substantially planar bottom surface and a pair of upward sloping substantially planar side walls that form an angle with respect to the top surface. The chip control feature may also include a plurality of radially offset bumps located in the depression. The bumps may have the same size and shape, or may have a different size and shape. The top surface also includes an elevated island having one or more indexing marks for easy indexing of the cutting insert.
Round cutting inserts may often manage a number of profiling operations from fine machining to rough machining. Usually, the round cutting inserts generate a fine surface also in connection with high feeding since the round edge functions as a wiper. However, the chip control may easily become deficient, especially in connection with small cutting depths when relatively wide and thin chips are formed that could be hard to break. Thereby, long curled chips are formed that at worst may entangle around the insert holder and scratch the generated surface and possibly cause insert breakdown. Further, round inserts are afflicted with the inherent disadvantage that it is not possible to select an entering angle at a certain cutting depth because the insert is round. Thus, there is a need to provide a round insert with improved chip control for a desired entering angle and a desired cutting depth.
BRIEF SUMMARY OF THE INVENTIONBriefly, according to this invention, there is provided a round cutting insert comprising a bottom surface; a clearance side surface; and a top surface including a chip control feature in the form of a continuous, circumferential depression having a plurality of radially offset bumps located in the depression.
In another embodiment, a round cutting insert comprises a bottom surface; a clearance side surface; and a top surface including a chip control feature in the form of a continuous, circumferential depression comprising a substantially planar bottom surface, and a pair of upward sloping substantially planar side walls, each side wall forming an angle with respect to the top surface, and a plurality of bumps located in the depression.
In yet another embodiment, a round cutting insert comprises a bottom surface; a clearance side surface; and a top surface including a chip control feature in the form of a continuous, circumferential depression comprising a substantially planar bottom surface, and a pair of upward sloping substantially planar side walls, each side wall forming an angle with respect to the top surface, and a plurality of radially offset bumps located in the depression, the top surface further comprising an elevated island having one or more indexing marks for indexing the cutting insert.
These and other features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:
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In the illustrated embodiment, the centerlines 122, 124, 126 of the chips 102, 104, 106 of grouping 108 are generally equidistant from each other. However, it will be appreciated that the invention can be practiced in which the centerlines 122, 124, 126 of the chips 102, 104, 106 are not equidistant from each other. For example, the centerlines 122, 124 of the bumps 102, 104 may be equidistant to each other, whereas the centerline 126 of the bump 106 is closer or more distant to the centerline 124 of the bump 104. As will be appreciated, other variations of the distance between the bumps 102, 104, 106 of each grouping 108, 110 are within the spirit and scope of the invention.
The bumps 102, 104, 106 may be the same in size and shape, or they may be different sizes and shapes. In the illustrated embodiment in
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As described above, a round cutting insert includes a chip control feature in the form of a continuous, circumferential depression that may include one or more bumps that provide additional chip control at various depths of cut.
The documents, patents and patent applications referred to herein are hereby incorporated by reference.
While the invention has been specifically described in connection with certain specific embodiments thereof, it is to be understood that this is by way of illustration and not of limitation, and the scope of the appended claims should be construed as broadly as the prior art will permit.
Claims
1. A round cutting insert, comprising: wherein a first bump is located at a first distance from the cutting edge, and wherein a second bump is located at a second distance from the cutting edge, the second distance being different than the first distance.
- a bottom surface;
- a clearance side surface;
- a top surface including a chip control feature in the form of a continuous, circumferential depression having a plurality of bumps located in the depression;
- a cutting edge formed at an intersection between the top surface and the clearance side surface; and
- a substantially flat downwardly sloping facet interposed between one of the side walls of the depression and the cutting edge, the facet forming an angle with respect to the top surface,
2. A cutting insert according to claim 1, wherein at least one bump is different in size than another bump
3. A cutting insert according to claim 1, wherein the plurality of bumps are teardrop in shape.
4. A cutting insert according to claim 1, wherein the depression comprises a substantially planar bottom surface, and a pair of upward sloping substantially planar side walls, each side wall forming an angle with respect to the top surface.
5. A cutting insert according to claim 4, wherein the angle formed by one side wall is different than the angle formed by the other side wall.
6-7. (canceled)
8. A cutting insert according to claim 1, wherein the top surface further comprises an elevated island having one or more indexing marks for indexing the cutting insert.
9. A round cutting insert, comprising:
- a bottom surface;
- a clearance side surface;
- a top surface including a chip control feature in the form of a continuous, circumferential depression comprising a substantially planar bottom surface, and a pair of upward sloping substantially planar side walls, each side wall forming an angle with respect to the top surface, and a plurality of bumps located in the depression, wherein at least one bump is different in size than another bump;
- a cutting edge formed at an intersection between the top surface and the clearance side surface; and
- a substantially flat downwardly sloping facet interposed between one of the side walls of the depression and the cutting edge, the facet forming an angle with respect to the top surface.
10. A cutting insert according to claim 9, wherein a cutting edge formed at an intersection between the top surface and the clearance side surface, and wherein at least one bump is located at a first distance from the cutting edge, and wherein a second bump is located at a second distance from the cutting edge, the second distance being different than the first distance.
11. (canceled)
12. A cutting insert according to claim 9, wherein the plurality of bumps are teardrop in shape.
13. A cutting insert according to claim 9, wherein the angle formed by one side wall is different than the angle formed by the other side wall.
14-15. (canceled)
16. A cutting insert according to claim 9, wherein the top surface further comprises an elevated island having one or more indexing marks for indexing the cutting insert.
17. A round cutting insert, comprising:
- a bottom surface;
- a clearance side surface;
- a top surface including a chip control feature in the form of a continuous, circumferential depression comprising a substantially planar bottom surface, and a pair of upward sloping substantially planar side walls, each side wall forming an angle with respect to the top surface, and a plurality of bumps located in the depression; and
- a substantially flat downwardly sloping facet interposed between one of the side walls of the depression and the cutting edge, the facet forming an angle with respect to the top surface.
18. A cutting insert according to claim 17, wherein at least one bump is different in size than another bump.
19. A cutting insert according to claim 17, wherein the angle formed by one side wall is different than the angle formed by the other side wall.
20. (canceled)
21. A cutting insert according to claim 17 wherein at least one bump is radially offset with respect to another bump.
22. A cutting insert according to claim 17, wherein at least one bump is different in size than another bump.
Type: Application
Filed: Jun 25, 2007
Publication Date: Dec 25, 2008
Inventors: Kenneth L. Niebauer (Ligonier, PA), Keith R. Zack (Homer City, PA)
Application Number: 11/821,708
International Classification: B23B 27/22 (20060101);