A cutting insert has a cutting edge formed on part of an intersecting ridge line portion of an upper face or a lower face and a side face. The cutting edge includes a major cutting edge, a minor cutting edge, and a connecting cutting edge that connects the major cutting edge and the minor cutting edge. A minor cutting edge flank that is part of the side face and that corresponds to the minor cutting edge includes a first minor cutting edge flank that connects to the minor cutting edge and that has a clearance angle of 0°, and a second minor cutting edge flank that connects to the first minor cutting edge flank and that has a clearance angle of a negative value. A connecting cutting edge flank that is part of the side face and that corresponds to the connecting cutting edge includes a first connecting cutting edge flank that connects to the connecting cutting edge and that has a clearance angle of 0° or greater, and a second connecting cutting edge flank that connects to the first connecting cutting edge flank and has a clearance angle that is greater than the clearance angle of the first connecting cutting edge flank.

A cutting insert suitable for a small-diameter milling tool is provided. A cutting insert has a rake face, a bottom surface, a circumferential side surface, and a through hole. A first ridgeline at which the rake face and the circumferential side surface intersect each other includes a first main cutting edge, and a first corner cutting edge connected to a tip of the first main cutting edge. The bottom surface includes a first bottom surface that comes closer to the rake face gradually toward a side at which the first main cutting edge is located when viewed from a central axis of the through hole, and a second bottom surface that comes closer to the rake face gradually toward a side opposite to the first main cutting edge when viewed from the central axis. A distance between a virtual intersection line, at which a first virtual surface formed by extending the first bottom surface and a second virtual surface formed by extending the second bottom surface intersect each other, and the first main cutting edge decreases from a tip side, at which the tip of the first main cutting edge is located, toward an end side, at which an end opposite to the tip is located, in an extending direction of the first main cutting edge.

Provided is a milling tool that allows a life of a tool main body to be elongated. The milling tool includes a replaceable cutting insert and a tool main body in which at least one insert seat that fixes the cutting insert is provided on a distal end side. The tool main body has a reinforcing wall covering at least a portion of the cutting insert when the cutting insert that is in a state of being fixed to the tool main body is viewed from the distal end side.

An indexable and double-sided round cutting insert includes an upper and lower side. A center axis extends between the upper and lower side and a median plane extends perpendicular to the center axis and is situated halfway between the upper and lower side. A side surface has an upper and lower positive clearance surface at an upper positive clearance angle with respect to an upper cutting edge and a lower positive clearance angle with respect to a lower cutting edge. A plurality of protrusions extends along the side surface and protrude in a radial direction perpendicular to the center axis. Each protrusion includes an outer surface, which along the center axis, extends such that a first radial distance from the center axis to the outer surface in the median plane is at least equal to or greater than a second radial distance from the center axis to the outer surface.

A tangential cutting insert includes two opposing main surfaces having a triangular shape, three identical side surfaces extending between the main surfaces, and at least three identical and indexable major cutting edges formed at the intersection of at least one of the main surfaces and the three identical side surfaces. Each side surface includes three flat support surfaces recessed in relation to the major cutting edge and arranged one after another in a longitudinal direction of each side surface. A first flat support surface is disposed centrally in each side surface and forms the lowermost recessed support surface in relation to the major cutting edge. Second and third flat support surfaces are located on opposite sides of the first flat support surface and extend at an obtuse angle with the first flat support surface. A milling tool having a plurality of insert seats receiving the tangential cutting insert is provided.

A cutting insert according to the present disclosure includes a first surface, a second surface, a side surface, and a cutting edge. The first surface has a rake face continuous to the cutting edge. The cutting edge has a corner cutting edge, a flat cutting edge, and a main cutting edge. The rake face has a first rake face portion, a second rake face portion, and a third rake face portion, the first rake face portion being continuous to the flat cutting edge, the second rake face portion being continuous to the main cutting edge, the third rake face portion being continuous to the corner cutting edge and being located between the first rake face portion and the second rake face portion. The rake face is provided with a level difference portion.

A cutting tool of the present disclosure may include a holder including a pocket, a shim member, a first screw and an insert. The shim member may include a first hole that opens into an outer side surface and an inner side surface. The pocket may include a second hole corresponding to the first hole. The first screw may be inserted into the first hole and the second hole. A first central axis of the first hole may be located ahead of a second central axis of the second hole in a rotation direction.

A double-sided tangential milling cutting insert for corner milling, contains: a first end surface, an opposed second end surface, two main side surfaces, two secondary side surfaces, and a through-hole penetrating the two main side surfaces. The first and second end surfaces each have two diagonally opposed raised corners and two diagonally opposed lowered corners. The cutting insert has a first symmetry plane and a reference plane dividing the cutting insert into two halves. First to fourth cutting edge sections each having a main cutting edge, a raised corner and a wiper edge are formed at intersections of the first and second end surfaces with the main side surfaces and secondary side surfaces. A transitional edge portion, connecting the wiper edge to an adjacent lowered corner, is formed along the secondary side surface.

A cutting body rotatable about a tool axis has an insert receiving pocket with a seat surface at an axial forward end thereof. The seat surface has a plurality of abutment elements, including an axial abutment element having an axially forward facing abutment surface and at least one radial abutment element. In a top view of the insert receiving pocket, the axially forward facing abutment surface forms an external acute clamping angle with a radially outward facing pocket wall. A rotary cutting tool includes the cutting body, and a cutting insert removably secured in the insert receiving pocket, having a base surface in contact with the seat surface. The at least one radial abutment element occupies or is occupied by at least one radial abutting element of the base surface, and the axially forward facing abutment surface is in contact with an axial abutting surface of the base surface.

A cutting insert has opposing upper and lower surfaces interconnected by a peripheral side surface, an insert axis passing through the upper and lower surfaces, and first and second upper cutting edges formed at the intersection of the upper surface and the peripheral side surface. A lower central protuberance having first, second, third and fourth abutment walls extends downwardly from the lower surface. In a cross-section taken in a first horizontal plane perpendicular to the insert axis and intersecting the lower central protuberance, the first, second, third and fourth abutment walls define an imaginary quadrilateral having diagonally opposing first and third internal angles and diagonally opposing second and fourth internal angles. The first and third internal angles are equal to each other, and the second and fourth internal angles are not equal to each other. Two cutting inserts are removably secured in a rotary cutting tool.