Milling Cutter and Cutting Insert Having Rear Protuberance Therefor
AssigneeIscar, Ltd.
InventorYuri Men
Life of this patent
Estimating the term…
Abstract
A cutting insert for mounting in a socket on an insert holder of a milling cutter. The cutting insert has opposing top and bottom surfaces and a peripheral surface extending therebetween, forming one or two cutting edges. The peripheral surface has a front arcuate surface and a rear surface. The rear surface has a protuberance that extends in a direction away from a central region of the front surface. The protuberance is located in the socket. The socket includes a first socket side abutment surface for providing primarily axial support for the cutting insert against cutting forces acting in an axial rearward direction during a milling operation.
Claims18
A cutting insert (24) comprising:
- opposing top and bottom surfaces (36, 38) and a peripheral surface (40) extending therebetween, the peripheral surface (40) comprising a front arcuate surface (42) and a rear surface (44), the front arcuate surface (42) meeting the top and bottom surfaces (36, 38) at two edges (58, 60), at least one of the edges (58) comprising a cutting edge;
- the rear surface (44) comprising a central back surface (46), two side abutment surfaces (48, 50) and two rear abutment surfaces (52, 54), the central back surface (46) being located between the two side abutment surfaces (48, 50) which extend forwardly therefrom, each side abutment surface (48, 50) being adjacent to a respective rear abutment surface (52, 54), the central back surface (46) and the two side abutment surfaces (48, 50) being located on a protuberance (56) of the cutting insert (24), the protuberance (56) protruding beyond the rear abutment surfaces (52, 54) in a direction away from a central region of the front arcuate surface (42);
- and
- an insert through hole (30) passing between the top and bottom surfaces (36, 38).
An insert holder (22) having a longitudinal axis of rotation (R) defining a forward to rear direction, a forward end of the insert holder having a plurality of identical insert pockets (26), each insert pocket (26) comprising:
- a base surface (34);
- a side wall (66) comprising side contact surfaces (82, 80);
- a pocket hole (32) in the base surface (34);
- and
- a socket (68) in the side wall (66) adjacent the base surface (34), the socket (68) comprising a bottom socket surface (70), a back socket surface (74) and two socket side abutment surfaces (76, 78), each socket side abutment surface (76, 78) extending from an adjacent side contact surface (82, 80), wherein:
- the socket (68) is configured and dimensioned to receive a portion of a cutting insert retained in said each insert pocket with only one of the two socket side abutment surfaces (76, 78) abutting a side of said portion.
A double-sided cutting insert (24) comprising:
- opposing top and bottom surfaces (36, 38) and a peripheral surface (40) extending therebetween, the peripheral surface (40) comprising a front arcuate surface (42) and a rear surface (44), the front arcuate surface (42) meeting the top and bottom surfaces (36, 38) at two edges (58, 60), each of the edges (58, 60) comprising a cutting edge;
- the rear surface (44) comprising a central back surface (46), two side abutment surfaces (48, 50) and two rear abutment surfaces (52, 54), the central back surface (46) being located between the two side abutment surfaces (48, 50) which extend forwardly therefrom, each side abutment surface (48, 50) being adjacent to a respective rear abutment surface (52, 54), the central back surface (46) and the two side abutment surfaces (48, 50) being located on a protuberance (56) of the cutting insert (24), the protuberance (56) protruding beyond the rear abutment surfaces (52, 54) in a direction away from a central region of the front arcuate surface (42);
- and
- an insert through hole (30) passing between the top and bottom surfaces (36, 38);
- wherein:
- the cutting insert (24) has 180° rotational symmetry about an axis of symmetry (B) which passes through the central back surface (46), the insert through hole (30) and the front arcuate surface (42);
- and
- the cutting insert is non-indexable about the insert through hole (30).
Dependencies are inferred from the claim text.