A cutting insert includes an insert longitudinal axis defining a forward to rear direction, opposing insert inner and outer side surfaces and an insert peripheral surface extending therebetween. The insert peripheral surface includes an insert rear end surface and an adjacent insert lower surface. The cutting insert includes two spaced apart peripheral abutment ridges that are distal the insert outer side surface and extend along the insert rear end surface and the insert lower surface, respectively. The two peripheral abutment ridges converge towards each other at an acute insert wedge angle in a rearward direction of the cutting insert, away from a cutting edge.

A cutting insert in the present disclosure includes an upper surface, a lower surface, a side surface, and an edge. The upper surface includes a first corner part and a second corner part. The edge is located in a region which is located between the first corner part and the second corner part. The edge includes a first edge located at a side of the first corner part, a second edge located at a side of the second corner part, and a third edge located between the first edge and the second edge. The edge has a curvilinear shape being recessed toward the lower surface in a side view. Each of a radius of curvature R1 of the first edge and a radius of curvature R2 of the second edge is smaller than a radius of curvature R3 of the third edge in a side view.

A cutting tool comprises a tool body having a first end and a second end, and a longitudinal axis extending between the first end and the second end. The first end comprises two or more cutting portions, with each of the cutting portions comprising a cutting edge and a flank surface.

Each cutting edge extends radially outwardly from a centre region of the first end to a perimetral edge of the first end, with the cutting edge being angled relative to the longitudinal axis. Each flank surface extends circumferentially from the cutting edge.

Each of at least two of the two or more flank surfaces comprises an abrasive portion extending over at least a part of the respective flank surface and each abrasive portion comprises a plurality of abrasive features.

A cutting insert includes an insert longitudinal axis defining a forward to rear direction, opposing insert inner and outer side surfaces and an insert peripheral surface extending therebetween. The insert peripheral surface includes an insert rear end surface and an adjacent insert lower surface. The cutting insert includes two spaced apart peripheral abutment ridges that are distal the insert outer side surface and extend along the insert rear end surface and the insert lower surface, respectively. The two peripheral abutment ridges converge towards each other at an acute insert wedge angle in a rearward direction of the cutting insert, away from a cutting edge.

In a cutting tool having an indexable cutting insert with three cutting portions, the cutting insert is removably securable to an insert holder by means of a fastener. The cutting insert has two opposing end surfaces with a peripheral side surface extending therebetween. At least one end surface has a central boss protruding therefrom with a raised support surface, and the peripheral side surface has three abutment recesses. In an end view of the cutting insert, each of the three abutment recesses is visible and located inside a first imaginary circle circumscribing the visible central boss. A holding portion of the insert holder has a seating surface with at least one protuberance protruding therefrom. The support surface is in clamping contact with the seating surface, and exactly two of the three abutment recesses are engaged with the at least one protuberance.

A method and a device for machining a workpiece rotating about a rotational axis. The machining point moves along the cutting edge of a cutting edge plane and the surface to be machined in a rolling movement on an advancement plane not intersected by the rotational axis. A pivot drive implements a large enough pivot angle so that a first workpiece surface is machined by a machining point moving along the first cutting edge in a first machining step. In a second machining step, a second workpiece surface is machined, wherein the machining point moves along the second cutting edge and the second workpiece surface. The cutting edge has a curvature radius smaller than the distance from the pivot axis of the holder to the cutting edge. The holder can additionally be displaced on the advancement plane with a movement component in a direction transverse to the rotational axis.

A cutting tool comprising a holder (12) having a slot-shaped, arcuate receptacle (16), with respectively a lower and an upper bearing surface (36, 38) attached to rigid clamping jaws (18, 20) of the holder (12), for the reception (16) of a cutting insert, (14) and a cutting insert (14) having an arcuate shank (22) with lower and upper locating face (32, 34), which cutting insert is arranged exchangeably in the receptacle (16), and having a cutting head (24) with cutting edge (26), which cutting head is disposed on a workpiece-side end (44) of the shank (22), wherein the arcuate receptacle (16) and the arcuate shank (22), measured respectively on the lower bearing surface (36) of the receptacle (16) and the lower locating face (32) of the cutting insert (14), extend respectively over at least 90, wherein the receptacle (16) extends over a larger angular range than the shank (22) of the cutting insert (14), and wherein the shank (22) is held in the receptacle (16) such that the holder-side end (28) of the shank (22) is distanced from the holder-side end (30) of the receptacle (16).

Provided is a cutting insert easy to be gripped by an operator or a robot hand. First and second end surfaces (10, 20) are formed in substantially polygonal shapes having second and fourth corners (B, H) formed at obtuse angles and first and third corners (A, G) formed at acute angles. A peripheral side surface (30) includes a first curved portion (41) connecting the first and third corners (A, G), a second curved portion (42) connecting the second and fourth corners (B, H), and a first side surface (31) interposed between the first and second curved portions (41, 42). The first side surface (31) is inclined with respect to a center axis (O). The second curved portion (42) is provided with a grip portion (50), and the grip portion (50) includes at least one of a shape of each of plane surfaces (51, 53) chamfered parallel to the center axis (O) and a shape of a recessed portion (52) formed to be spaced apart from the first and second end surfaces (10, 20) and recessed toward the center axis (O).

A cutting insert for a modular rotary cutting tool is disclosed. The cutting insert may include a shaft, opposing insert centering surfaces, and convex torque transmission insert drive surfaces.