The present disclosure's technical object is to provide a high feed cutting insert capable of providing a sufficient entering angle while ensuring rigidity of a cutting tool's bottom part. For this, the high feed cutting insert of the present disclosure comprises a short cutting edge provided on a boundary portion between a main surface and a short side surface, a long cutting edge provided on a boundary portion between the main surface and a long side surface, two ascending corner cutting edges connecting the short cutting edge and the long cutting edge, and placed on one diagonal position, and two descending corner cutting edges placed on the other diagonal position and having the height lower than that of the ascending corner cutting edges, wherein the short cutting edge and the long cutting edge, when viewed towards the main surface, form an obtuse angle while the ascending corner cutting edges are interposed therebetween and form an acute angle while the descending corner cutting edges are interposed therebetween.

A cutting insert may include a first surface. The first surface may include a first side, a second side, a first corner, a land surface and an inclined surface. The land surface may include a first land surface, a second land surface and a corner land surface. The first land surface may be located along the first side. The second land surface may be located along the second side. The corner land surface may be located along the first corner. The first land surface may include a part thereof where a first land angle increases as going away from the first corner. The corner land surface may include a part thereof where a corner land angle increases as going away from the first side.

Provided is a cutting insert, within which a burr being generated at an outer edge of a finished surface is inhibited and chipping of the cutting insert is inhibited even when the cutting insert is formed to have multiple corners superior in economical efficiency. The cutting insert has an upper surface, a lower surface on an opposite side to the upper surface, and a circumferential side surface connecting the upper surface and the lower surface to each other. A first ridgeline at which the upper surface and the circumferential side surface intersect each other includes major cutting edges and wiper cutting edges which are alternately disposed one by one, and corners each disposed between each of the major cutting edges and each of the wiper cutting edges. A distance between the corners that are adjacent to each other is equal to or less than 60% of a diameter of an inscribed circle of the first ridgeline. The corner that is positioned at one end of the wiper cutting edge is formed at a deburring cutting edge that intersects the wiper cutting edge at an angle smaller than an angle formed by the major cutting edge and the wiper cutting edge. The corner that is positioned at the other end of the wiper cutting edge is formed at a corner cutting edge having a curvature larger than that of the wiper cutting edge.

In an end view, a cutting insert 10 comprises a first connecting part 30A which is inclined such that the first connecting part 30A travels in a first direction as it heads away from a second peripheral side surface part 18 and approaches a fourth peripheral side surface part 22, and also comprises a second connecting part 30B which is connected to a center point serving as an end of the first connecting part 30A and which is inclined such that the second connecting part 30B travels in a third direction as it heads away from the second peripheral side surface part 18 and approaches the fourth peripheral side surface part 22. A cutting edge 24 comprises: a first cutting edge part 24A which is formed on the first connecting part 30A so as to be distant, by a first distance L1, from a virtual plane PR1 including a center point C1; a second cutting edge part 24B which has, in a side view, a concave circular-arc shape having a second curvature radius smaller than a first curvature radius and which is formed on the second connecting part 30B so as to be distant, by a second distance L2 greater than the first distance L1, from the virtual plane PR1; and a third cutting edge part 24C connecting the first cutting edge part 24A and the second cutting edge part 24B.

A rotary cutting tool includes a cutting head having a plurality of insert-receiving pockets for radially mounting a first type of cutting insert in a first cutting region and for tangentially mounting a second type of cutting insert in a second cutting region. The first cutting region has a first length, L1, and the second cutting region has a second length, L2, that is greater in magnitude than the first length, L1. The two types of cutting inserts provides a hybrid cutting insert design in which the first type of cutting inserts provide an increased chip gash volume for effective chip evacuation, and the second type of cutting inserts provide an increased core diameter to minimize deflection of the rotary cutting tool.

A single-sided three-way indexable milling insert for 90° shoulder milling operations, includes a positive basic shape, a rake surface, a peripheral surface including side abutment surfaces, a base bearing surface and a screw hole connecting the rake and base bearing surfaces. The insert has three main cutting edges which lie along an imaginary equilateral triangle. A material volume V.sub.F of the cutting insert and a void volume V.sub.S of the insert's screw hole fulfill the condition V.sub.S/V.sub.F≥0.30.

A cutting insert includes: an upper face including a virtual reference surface and an upper inclined surface extending to be inclined upward from the virtual reference surface; a lower face disposed below the upper face and including a lower inclined surface extending to be inclined with respect to the virtual reference surface; and a plurality of side faces connecting the upper face and the lower face. An insert bore is formed to penetrate through the upper face and the lower face along a central axis perpendicular to the virtual reference surface. A major cutting edge is formed at an edge at which the upper inclined surface meets any one side face among the plurality of side faces. A first angle between the side face, on which the major cutting edge is formed, and the upper inclined surface is greater than a second angle between the central axis and the lower inclined surface.

A cutting insert 2 comprises a peripheral side surface 30 which is parallel to a central axis O of a first end surface 10 and a second end surface 20. The peripheral side surface 30 comprises a first side surface 31 facing a first major cutting edge 11, a second side surface 32 facing a first wiper edge 12, and a third side surface 33 facing a first inner edge 13. A flank 311 of the first major cutting edge 11 and a flank 321 of the first wiper edge 12 are inclined such that the flank 311 and 321 approaches the central axis O as it heads toward the first end surface 10. The flank 311 of the first major cutting edge 11 is located on a different plane from the first side surface 31. The flank 321 of the first wiper edge 12 is located on a different plane from the second side surface 32. Meanwhile, a flank of the first inner edge 13 is located on the same plane as the third side surface 33.

A single-sided four-way indexable cutting insert includes a positive basic shape, a rake surface, a peripheral surface including four side abutment surfaces, a base bearing surface and a screw hole connecting the rake and base bearing surfaces. The insert has an imaginary square frustum which defines a square base containing the cutting insert's base bearing surface, and further defines four isosceles trapezoid side surfaces respectively containing the cutting insert's four side abutment surfaces. A material volume V.sub.F of the cutting insert and a void volume V.sub.S of the insert fulfill the condition V.sub.S/V.sub.F0.25.

A cutting insert for a milling tool including an upper side having a central surface, a lower side, a peripheral side surface, and a cutting edge formed between the upper side and the peripheral side surface. The cutting edge having a positively inclined main cutting edge projecting at least partly above the central surface. The upper side includes a rake surface extending inside of and along the at least one cutting edge, sloping downward toward the central surface. A plateau, elevated with respect to the central surface and extending along the main cutting edge, is formed inside the rake surface. A transition between the rake surface and the plateau extends at an angle .sub.2 with respect to an upper extension plane, wherein .sub.2>0.