US 2019/0240737 A1Published application

Grooving insert having rearwardly pointing arrowhead-shaped chip former

AssigneeIscar, Ltd.

InventorOleg Kertsman

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Abstract

A cutting insert has a cutting edge formed at an intersection of a rake surface and a relief surface, with a chip-control arrangement located at the rake surface. The chip-control arrangement includes a depression that includes a depression declining surface that extends downwardly in a direction away from the major cutting edge. A chip deflecting surface located rearward of the depression is inclined upwardly in a direction away from the major cutting edge. A chip former includes an interposed projection that extends from the chip deflecting surface to the depression declining surface, and two lateral protuberances that extend from opposite sides of the interposed projection to the depression declining surface beyond a forwardmost portion of the interposed projection.

Claims41

Dependent claims

A cutting insert (20) comprising:

a cutting portion (34), having a cutting portion major axis (A) defining a forward to rearward direction (DF, DR), the cutting portion (34) comprising:
a major cutting edge (36) formed at an intersection of an upward facing rake surface (38) and a forward facing major relief surface (40), wherein in a top view of the cutting portion (34), the major cutting edge (36) has a cutting edge length (L) which also defines a maximum width dimension of the cutting portion (34) in a direction perpendicular to the cutting portion major axis (A);
a chip-control arrangement (50) at the rake surface (38) comprising:
a depression (60) recessed in the rake surface (38), a forwardly disposed portion of the depression (60) comprising a depression declining surface (68) that extends downwardly in a direction away from the major cutting edge (36);
a rake ascending surface (52) formed on the rake surface (38), the rake ascending surface (52) being inclined upwardly in a direction away from the major cutting edge (36), a portion of the rake ascending surface (52) being disposed rearward of the depression (60) forming a chip deflecting surface (60);
an interposed projection (74) extending along a projection longitudinal axis (B) in the forward direction, from the chip deflecting surface (60) to the depression declining surface (68);
and
two lateral protuberances (78) extending from opposite sides of the interposed projection (74) to the depression declining surface (68), each lateral protuberance (78) extending along a respective protuberance longitudinal axis (C), beyond a forwardmost portion of the interposed projection (74), wherein the two lateral protuberances (78) are inclined downwardly in a direction away from the major cutting edge (36).

5 more elements

A cutting insert (20) comprising:

a cutting portion (34), having a cutting portion major axis (A) defining a forward to rearward direction (DF, DR), the cutting portion (34) comprising:
a major cutting edge (36) formed at an intersection of an upward facing rake surface (38) and a forward facing major relief surface (40), wherein in a top view of the cutting portion (34), the major cutting edge (36) has a cutting edge length (L) which also defines a maximum width dimension of the cutting portion (34) in a direction perpendicular to the cutting portion major axis (A);
a chip-control arrangement (50) at the rake surface (38) comprising:
a depression (60) recessed in the rake surface (38), a forwardly disposed portion of the depression (60) comprising a depression declining surface (68) that extends downwardly in a direction away from the major cutting edge (36);
a rake ascending surface (52) formed on the rake surface (38), the rake ascending surface (52) being inclined upwardly in a direction away from the major cutting edge (36), a portion of the rake ascending surface (52) being disposed rearward of the depression (60) forming a chip deflecting surface (60);
an interposed projection (74) extending along a projection longitudinal axis (B) in the forward direction, from the chip deflecting surface (60) to the depression declining surface (68);
and
two lateral protuberances (78) extending from opposite sides of the interposed projection (74) to the depression declining surface (68), each lateral protuberance (78) extending along a respective protuberance longitudinal axis (C), beyond a forwardmost portion of the interposed projection (74),
wherein,
the cutting portion (34) comprises two lateral minor cutting edges (46), formed at intersections of the rake surface (38) and two opposing minor relief surfaces (48), the minor cutting edges (46) merging with the major cutting edge (36) at opposite ends thereof;
and
in the top view of the cutting portion (34), a majority of each lateral protuberance (78) is further from the cutting portion major axis (A) than from an adjacent one of the two minor cutting edges (46).

9 more elements

A cutting insert (20) comprising:

a cutting portion (34), having a cutting portion major axis (A) defining a forward to rearward direction (DF, DR), the cutting portion (34) comprising:
a major cutting edge (36) formed at an intersection of an upward facing rake surface (38) and a forward facing major relief surface (40), wherein in a top view of the cutting portion (34), the major cutting edge (36) has a cutting edge length (L) which also defines a maximum width dimension of the cutting portion (34) in a direction perpendicular to the cutting portion major axis (A);
a chip-control arrangement (50) at the rake surface (38) comprising:
a depression (60) recessed in the rake surface (38), a forwardly disposed portion of the depression (60) comprising a depression declining surface (68) that extends downwardly in a direction away from the major cutting edge (36);
a rake ascending surface (52) formed on the rake surface (38), the rake ascending surface (52) being inclined upwardly in a direction away from the major cutting edge (36), a portion of the rake ascending surface (52) being disposed rearward of the depression (60) forming a chip deflecting surface (60);
an interposed projection (74) extending along a projection longitudinal axis (B) in the forward direction, from the chip deflecting surface (60) to the depression declining surface (68);
and
two lateral protuberances (78) extending from opposite sides of the interposed projection (74) to the depression declining surface (68), each lateral protuberance (78) extending along a respective protuberance longitudinal axis (C), beyond a forwardmost portion of the interposed projection (74),
wherein, in the top view of the cutting portion (34), each of the two lateral protuberances (78) is narrower than the interposed projection (74) in their respective widthwise directions.

6 more elements

Dependencies are inferred from the claim text.