Round cutting insert with serrated topography
AssigneeKennametal Inc.
InventorsBrad Daniel Hoffer, Thomas Jerry Long, II
Life of this patent
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Abstract
A cutting insert with a serrated topography includes a top surface terminating in a circular cutting edge, a bottom surface and a frusto-conical sidewall interconnecting the top surface and the bottom surface, and a plurality of serrations on the top surface uniformly disposed around the circular cutting edge and extending radially inward from the cutting edge in such a way that a bisector through each serration passes through a central axis of the cutting insert. The plurality of serrations are positioned in a cutting tool in such a way so as to reduce regenerative chatter during a cutting operation. A method of reducing generative chatter by positioning the cutting inserts in a particular fashion in a cutting tool is also disclosed.
Claims7
A cutting insert with a serrated topography, comprising:
- a top surface terminating in a circular cutting edge, a bottom surface and a frusto-conical sidewall interconnecting the top surface and the bottom surface;
- a plurality of serrations uniformly disposed on the top surface and extending radially inward from the cutting edge in such a way that a bisector through each serration passes through a central axis of the cutting insert;
- and
- a plurality of curved stop surfaces uniformly disposed around the frusto-conical sidewall and extending to the bottom surface of the insert,
- wherein each of the curved stop surfaces includes a pair of mirror-symmetrical oblique engagement portions,
- wherein each of the stop surfaces is defined by side edges formed by mirror-symmetrical S-type curves between top and bottom ends of each surface,
- wherein a central portion of each the stop surfaces is tapered such that a depth of each of the stop surfaces increases between the top and bottom ends of each surface, and
- wherein the plurality of serrations reduce regenerative chatter during a cutting operation.
A method of reducing regenerative chatter in a cutting tool having a plurality of cutting inserts mounted in an even number of pockets, each cutting insert comprising a top surface terminating in a circular cutting edge, a bottom surface and a frusto-conical sidewall interconnecting the top surface and the bottom surface;
- and a plurality of serrations disposed on the top surface, the method comprising:
- positioning a first cutting insert of the plurality of cutting inserts at a first serration position;
- and
- positioning a second cutting insert of the plurality of cutting inserts at a second serration position by rotating the second cutting insert about its central axis ½ (360/(a total number of serrations)) degrees with respect to the first cutting insert,
- wherein the first and second serration positions are repeated in an alternating fashion for cutting tool having more than two pockets.
A method of reducing regenerative chatter in a cutting tool having a plurality of cutting inserts mounted in an odd number of pockets, each cutting insert comprising a top surface terminating in a circular cutting edge, a bottom surface and a frusto-conical sidewall interconnecting the top surface and the bottom surface;
- and a plurality of serrations disposed on the top surface, the method comprising:
- positioning a first cutting insert of the plurality of cutting inserts at a first serration position;
- positioning a second cutting insert of the plurality of cutting inserts at a second serration position by rotating the second cutting insert about its central axis ½ (360/(a total number of serrations)) degrees with respect to the first cutting insert;
- and
- positioning a third cutting insert at a third serration position by rotating the third cutting insert about its central axis ¼ (360/(a total number of serrations)) degrees with respect to the first cutting insert for cutting tool having an odd number of pockets,
- wherein the first, second and third serration positions are repeated in an alternating fashion for a cutting tool having more than three pockets.
Dependencies are inferred from the claim text.