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.

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.

A cutting insert includes a body made of a ceramic material. The body has a first surface, a second surface and at least one flank surface extending between the first surface and the second surface. The first surface includes a chip forming feature extending in a radially outwardly direction to a cutting edge and extending in a radially inwardly direction to an inner edge. The chip forming feature includes a front wall that slopes downward from the cutting edge radially inward toward a rounded bottom surface and a back wall that slopes upward from the rounded bottom surface radially inward to the inner edge. The chip forming feature can include an optional land surface between the cutting edge and the front wall.

A cutting insert according to an embodiment of the present invention has a body section and a cutting section located closer to a front end side than the body section. The cutting section has an end cutting edge located along an intersection of an upper surface and a side surface, a recess located from the end cutting edge toward the body section, and a pair of protrusions opposed to each other with the recess interposed therebetween. The pair of protrusions has a first protrusion and a second protrusion located on the first protrusion. The first protrusion has a first inclined surface that is inclined upward and approaches another one of the pair of protrusions as going from the front end side toward the rear end side. A periphery of the second protrusion which is close to the front end side has a convex curvilinear shape in a top view.

A cutting insert includes a body made of a ceramic material. The body has a first surface, a second surface and at least one flank surface extending between the first surface and the second surface. The first surface includes a chip forming feature extending in a radially outwardly direction to a cutting edge and extending in a radially inwardly direction to an inner edge. The chip forming feature includes a front wall that slopes downward from the cutting edge radially inward toward a rounded bottom surface and a back wall that slopes upward from the rounded bottom surface radially inward to the inner edge. The chip forming feature can include an optional land surface between the cutting edge and the front wall.

The present invention provides a novel groove cutter with chip breaker, including: a cutter body; a cutter head arranged at the end part of the cutter body, a cutting edge being arranged at a bordering position of the cutter head; and a chip breaker arranged on the cutter head, wherein the chip breaker comprises a breaker bottom and a breaker wall, the breaker bottom being connected to the cutting edge, the breaker wall being arranged on one side of the breaker bottom away from the cutting edge, the breaker bottom being non-coplanar with the breaker wall, an intersecting line of the breaker bottom and the breaker wall including multiple connecting sections, and one curved transition section being arranged between two adjacent connecting sections. By means of the technical solutions provided in the present application, the problem that breaking chips in a groove machining process is difficult in the prior art can be solved.

A cutting element for use in a cutting operation, comprising a cutting edge (CE) capable of cutting out material from a workpiece during the operation, to form therein a workpiece corner of angle alpha. There exists at least one view of the cutting edge in which a portion of the cutting edge is delimitable by a first (L1) and a second (L2) line oriented tangentially to the portion of the cutting edge portion at respective tangency points A and B. The lines form therebetween a cutting angle corresponding to the workpiece corner angle alpha and have a vertex 0. For a bisector of the cutting angle intersecting the portion of the cutting edge at the point C, the projection C of the point C of the portion of the cutting edge on a line OL passing through the vertex 0 perpendicularly to the plane of the one view is located between projections A1 and B of the respective points A and B of the portion of the cutting edge on the line OL.

A cutting tool includes an upper surface, a flank, and a cutting edge formed on an edge between the upper surface and the flank, the cutting tool having a shape extending in a longitudinal direction along a longitudinal reference axis from a base end part to a leading end part, the cutting tool having the cutting edge member at the leading end part, in which the cutting tool is provided with a chip discharge groove that is constituted by a wall surface at least part of which is curved and at least part of which is located at a position higher than the cutting edge, in which the chip discharge groove has a shape extending in a direction different from an axial direction of the longitudinal reference axis.

A cutting insert may include an upper surface, a lateral surface, and a cutting edge including a boundary between the upper surface and the lateral surface. The upper surface may include a first rising face that extends upward and a second rising face that is connected to an upper side of the first rising face and extends upward. The first rising face may include a first region that extends along a corner portion and a second region that extends along a side portion. The second rising face may include a third region connected to the first region and a fourth region connected to the second region. An entirety of a boundary between the first region and the third region may be positioned above the cutting edge. A boundary between the second region and the fourth region may include a portion disposed below the cutting edge.