Cutting insert

Abstract

A cutting insert comprising at least one cutting edge (5), a rake surface (2) which extends from the cutting edge (5), a relief surface (3) which intersects the rake surface (2) with the cutting edge (5) disposed therebetween, a recess (6) which is, when viewed from the cutting edge (5), located behind the rake surface (2) so as to be recessed downward from the rake surface (2), and at least one protrusion (7) which protrudes upward from the bottom surface (6a) of the recess. The entire protrusion is disposed below an extension surface of the rake surface (2), and at least one portion of the upper surface of the protrusion is separated from the extension surface of the rake surface as the at least said portion is separated from the cutting edge.

Description

technical field [0001] The present invention relates to a cutting insert mounted on an exchangeable cutting tool. Background technique [0002] Patent Document 1 discloses a throwaway insert (that is, a cutting insert) provided with a chip breaker. In this throwaway insert, a chip breaker portion is provided on the rake face adjacent to the cutting edge. The chip breaker portion includes a plurality of recesses and protrusions extending in a direction intersecting the cutting edge, and the recesses and protrusions are alternately arranged in a direction parallel to the cutting edge. The surfaces of the concave portion and the protruding line portion of the chip breaker portion form concavo-convex curves that are smoothly connected to each other in a cross section parallel to the cutting edge. [0003] When the throwaway insert is used for heavy cutting, the chips generated by the cutting edge collide with the chip breaker and are deformed by the curve formed by the cross-s...

AI Technical Summary

Problems solved by technology

[0005] However, in the throw-away insert described in Patent Document 1, when the chips generated by the cutting edge are deformed by the above-mentioned chip breaker portion, the deformation resistance of the chip acting on the chip breaker portion becomes large, and there is a possibility that High vibration or high frequency vibration occurs on throw-away insert or cutting tool body

Especially in heavy cutting, since a large deformation resistance occurs in order to deform thicker chips, there may be problems of poor machining accuracy, non-regrinding inserts, or damage to the cutting tool body

In addition, the contact area is reduced by ensuring a gap between the groove bottom of the recess and the chip, and the contact area between the other surface and the chip is concentrated on the protrusion, so the wear of the protrusion is promoted, and the wear of the protrusion may be lost early. The effect of stabilizing the outflow direction of chips

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