Abstract: A cutting tool including: a tool body (2) provided with an insert support seat (5) including a major seat surface (5a) that supports a bearing surface of a cutting insert, a plurality of seat side surfaces (5b, 5c) that supports side surfaces of the cutting insert at different positions, and a thinned portion (5d) continuous with the major seat surface and the seat side surfaces; and a cutting insert attached to the insert support seat, wherein a ridge at a position where the major seat surface and the thinned portion intersect, a ridge at a position where the seat side surface and the thinned portion intersect, and a ridge at a position where the thinned portions continuous with each other intersect are each formed of a convex arc curved surface.

Abstract: A cutting tool including: a tool body (2) provided with an insert support seat (5) including a major seat surface (5a) that supports a bearing surface of a cutting insert, a plurality of seat side surfaces (5b, 5c) that supports side surfaces of the cutting insert at different positions, and a thinned portion (5d) continuous with the major seat surface and the seat side surfaces; and a cutting insert attached to the insert support seat, wherein a ridge at a position where the major seat surface and the thinned portion intersect, a ridge at a position where the seat side surface and the thinned portion intersect, and a ridge at a position where the thinned portions continuous with each other intersect are each formed of a convex arc curved surface.

Abstract: A cutting insert includes a first surface and a second surface each of which is polygonal and that face away from each other; a side surface that is continuous with the first surface and a side surface that is continuous with the second surface; a cutting edge formed along each of a ridge where the first surface and the side surface intersect and a ridge where the second surface and the side surface intersect; a bearing surface formed in each of a part the first surface and a part of the second surface adjacent to an insert center, the bearing surfaces disposed parallel to each other; and a recessed portion that separates the side surface that is continuous with the first surface from the side surface that is continuous with the second surface. The cutting edge includes three corner edges, a first cutting edge, and a second cutting edge, the first and second cutting edges being continuous with each other and located between each pair of the corner edges.

Abstract: A cutting insert, used for a milling cutter, which includes two polygonal main surfaces that are opposite each other and a plurality of side faces and whose main surfaces are rake faces, whose side faces are flank faces, and whose ridge lines at positions where the main surfaces and the side faces cross each other are used as cutting edges include two major side surfaces that are opposite each other and a plurality of minor side surfaces that are formed continuously with the major side surfaces. A mounting hole is provided at the two major side surfaces in a direction in which the mounting hole extends therethrough, and areas of the two major side surfaces are greater than those of the main surfaces. The major side surfaces and the minor side surfaces are provided with flutes along entire regions of the cutting edges.

Abstract: An object is to provide a cutting insert for a milling cutter with which efficiency in machining can be increased. The cutting insert includes two polygonal main surfaces facing each other and side surfaces each connected to a corresponding side of each of the main surfaces. The side surfaces include a major side surface through which an attachment hole extends, a first minor side surface perpendicular to the major side surface, and a second minor side surface disposed between the first minor side surface and the major side surface. A ridge between each of the main surfaces and the major side surface forms a major cutting edge, and a ridge between each of the main surfaces and the second minor side surface forms a minor cutting edge. An angle between the major cutting edge and the minor cutting edge is 145° or larger.

Abstract: A cutting tool including: a tool body (2) provided with an insert support seat (5) including a major seat surface (5a) that supports a bearing surface of a cutting insert, a plurality of seat side surfaces (5b, 5c) that supports side surfaces of the cutting insert at different positions, and a thinned portion (5d) continuous with the major seat surface and the seat side surfaces; and a cutting insert attached to the insert support seat, wherein a ridge at a position where the major seat surface and the thinned portion intersect, a ridge at a position where the seat side surface and the thinned portion intersect, and a ridge at a position where the thinned portions continuous with each other intersect are each formed of a convex arc curved surface.

Abstract: A cutting insert includes a first surface and a second surface each of which is polygonal and that face away from each other; a side surface that is continuous with the first surface and a side surface that is continuous with the second surface; a cutting edge formed along each of a ridge where the first surface and the side surface intersect and a ridge where the second surface and the side surface intersect; a bearing surface formed in each of a part the first surface and a part of the second surface adjacent to an insert center, the bearing surfaces disposed parallel to each other; and a recessed portion that separates the side surface that is continuous with the first surface from the side surface that is continuous with the second surface. The cutting edge includes three corner edges, a first cutting edge, and a second cutting edge, the first and second cutting edges being continuous with each other and located between each pair of the corner edges.

Abstract: An object is to provide a cutting insert for milling that has a minor cutting edge for wiping to achieve improved machined surface quality. A minor cutting edge 3 at a corner includes two circular cutting edge portions 3a and 3a joined to major cutting edges 2 on both sides of the corner and a straight cutting edge portion 3b located between the two circular cutting edge portions 3a. The cutting insert satisfies the following conditions: 0.05TA?L1?0.4TA, 0.1L1?L?0.5L1, and h?15 ?m, where TA is the radius of a circle inscribed inside the major cutting edges 2 as viewed in the thickness direction of the cutting insert, L1 is the length of the minor cutting edge 3 in the longitudinal direction of the straight cutting edge portion 3b, L is the length of the straight cutting edge portion 3b, and h is the height of the minor cutting edge 3.

Abstract: A cutting insert, used for a milling cutter, which includes two polygonal main surfaces that are opposite each other and a plurality of side faces and whose main surfaces are rake faces, whose side faces are flank faces, and whose ridge lines at positions where the main surfaces and the side faces cross each other are used as cutting edges include two major side surfaces that are opposite each other and a plurality of minor side surfaces that are formed continuously with the major side surfaces. A mounting hole is provided at the two major side surfaces in a direction in which the mounting hole extends therethrough, and areas of the two major side surfaces are greater than those of the main surfaces. The major side surfaces and the minor side surfaces are provided with flutes along entire regions of the cutting edges.

Abstract: An object is to provide a cutting insert for a milling cutter with which efficiency in machining can be increased. The cutting insert includes two polygonal main surfaces facing each other and side surfaces each connected to a corresponding side of each of the main surfaces. The side surfaces include a major side surface through which an attachment hole extends, a first minor side surface perpendicular to the major side surface, and a second minor side surface disposed between the first minor side surface and the major side surface. A ridge between each of the main surfaces and the major side surface forms a major cutting edge, and a ridge between each of the main surfaces and the second minor side surface forms a minor cutting edge. An angle between the major cutting edge and the minor cutting edge is 145° or larger.

Abstract: An object is to provide a cutting insert for milling that has a minor cutting edge for wiping to achieve improved machined surface quality. A minor cutting edge 3 at a corner includes two circular cutting edge portions 3a and 3a joined to major cutting edges 2 on both sides of the corner and a straight cutting edge portion 3b located between the two circular cutting edge portions 3a. The cutting insert satisfies the following conditions: 0.05 TA?L1?0.4 TA, 0.1 L1?L?0.5 L1, and h?15 ?m, where TA is the radius of a circle inscribed inside the major cutting edges 2 as viewed in the thickness direction of the cutting insert, L1 is the length of the minor cutting edge 3 in the longitudinal direction of the straight cutting edge portion 3b, L is the length of the straight cutting edge portion 3b, and h is the height of the minor cutting edge 3.