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 tool holder includes a tool shank and a tool head connected to the tool shank. The tool head has a rear surface. An insert seat or a blade pocket is partially formed on both the tool head and the tool shank, and extends rearwardly of the tool head's rear surface. Adjacent to at least a portion of a shank side surface there is a reinforcement portion connecting the shank side surface and the tool head.

A cutting tool assembly includes a cutting tool and an indexable cutting insert having an insert index axis. The cutting insert includes parallel insert first and second sides connected by an insert peripheral surface that extends peripherally around the cutting insert. At least one clamping hole opens out to one or both of the insert first and second sides, and at least a portion of the clamping hole is in a clamping region of the cutting insert. The insert peripheral surface includes cutting edges that are spaced-apart and extend from the insert first side to the insert second side. Along a width direction, which is perpendicular to the insert first and second sides, each of the cutting edges is wider than the cutting insert, at least at the cutting region of the cutting insert.

A cutting tool having a tool holder, cutting insert and clamping member. The tool holder includes an elongated supporting surface extending in a rearward-to-forward direction. The cutting insert has a central portion and three cutting portions, the central portion having two opposing side surfaces and three spaced apart locating surfaces defining a first imaginary triangle. The cutting insert is indexable about a central axis intersecting the two side surfaces. Each locating surface intersects two of three bisector planes containing the central axis and bisecting respective corners of the first imaginary triangle, and the cutting edge of each cutting portion is located entirely outside of the first imaginary triangle. In each index position the clamping member is located entirely rearward of a first vertical plane containing the central axis and perpendicular to the rearward-to-forward direction, and one of the locating surfaces is in clamping contact with the supporting surface.

A cutting insert has a bottom supporting surface, a center cutting edge, two secondary cutting edges, realized on both sides of the center cutting edge and offset in relation to the center cutting edge, and two transition edges connecting the center cutting edge to the secondary cutting edge adjacent in each case. The two secondary cutting edges are realized in each case vertically offset and, where applicable, also offset in depth with respect to the center cutting edge and are laterally spaced from the center cutting edge. The transition edges, in each case in a non-edge-overlapping region, have at least over a portion an inclination n where 2n20 in relation to a height direction which extends at right angles with respect to a main extension plane of the supporting surface.

An object of the present invention is to configure a cutting-off processing tool that includes a cutting edge angled at an end cutting edge angle and causes evacuation of chips to be controlled so that the chips are evacuated in the tool axis direction, thereby reducing concerns about damage to a processed surface by the chips. The cutting-off processing tool includes a cutting edge angled at the end cutting edge angle. In the cutting-off processing tool, an upper surface has a shape laterally asymmetric about a center in a width direction. In the cutting-off processing tool, when b is a rake angle of a rake face on a first corner side positioned on a foremost end of the tool, and c is a rake angle of the rake face on a second corner side, b>c is satisfied.

A cutting insert of one aspect includes a main body section and a cutting section located in front of the main body section. The cutting section includes a front cutting edge disposed along a ridge line of the cutting section at an intersection between a top surface and a first side surface; and a lateral cutting edge disposed along the ridge line at an intersection between the top surface and a second side surface and inclined with ascending as getting away from the front cutting edge. The lateral cutting edge each includes a first region and a second region located to a rear of the first region; and an angle of inclination of the second region with respect to the bottom surface is larger than an angle of inclination of the first region with respect to the bottom surface.

A cutting insert (1) includes a top surface (6), a side surface, a rake face (10) on the top surface (6), a front flank face (11) and a lateral flank face (12), a cutting edge (9) including a front cutting edge (13), and a lateral cutting edge (14), a breaker groove (15) adjacent to the front cutting edge (13) and the lateral cutting edge (14), and a rake face end (20). The breaker groove (15) includes a descending surface (16) and an ascending surface (17). The ascending surface (17) includes a front wall surface (21) and a lateral wall surface (22) on the side of the front cutting edge (13) and the side of the lateral cutting edge (14). An opening angle (1) of the front wall surface (21) is greater than an opening angle (2) of the lateral wall surface (22) in the top surface (6) view.

A cutting assembly includes toolholder and a cutting insert. The cutting insert includes a top surface, a rake face and a cutting edge. The top surface includes a coolant duct along a central, longitudinal axis, A, that directs coolant from an inlet region to a cutting region. The cutting region includes a pair of chip deflectors and a plurality of coolant directing elements separating a plurality of coolant channels configured in at least one hub and spoke arrangement that directs coolant radially outward from the central, longitudinal axis, A, to the entire cutting edge of the cutting insert.

A holder for grooving work includes a shank portion, and a head portion located on an end portion thereof. The head portion includes an insert attaching space, an upper and lower respectively located above and below the insert attaching space, a slit extending backward from the insert attaching space, an upper and a lower jaw connecting portions divided by the slit, an upper clamp surface on the upper jaw and a lower clamp surface on the lower jaw opposed to the insert attaching space. A column-shaped groove is connected to the deepest end of the slit. The column-shaped groove is formed to reduce the thickness of the upper jaw connecting portion, and extends from the lateral face on the side of the insert attaching space halfway along the deepest end of the slit toward the opposite lateral face. Upon attaching the insert to the holder the cutting tool is obtained.