Patent ID: 8926234
Filing Date: 2015-01-06
Classification: B23C,Y10T

Abstract:
1. An indexable end-milling insert, comprising: an underside, an upperside, and a plurality of cutting edges that are formed between the upperside and a number of clearance sides, the cutting edges individually include a chip-removing main edge and a surface-wiping wiper edge that transforms into a next main edge via a corner of the cutting insert; the individual main edge extending arched between a first end and an opposite second end, which in relation to the underside, is situated on a higher level than the first end, wherein the individual main edge is arched concavely proximate the first end the main edge being delimited between a chip surface situated inside a cutting-edge line, and a concavely arched primary clearance surface positioned outside the cutting-edge line, below which there is a convexly arched secondary clearance surface, the primary clearance surface being defined between the first and second ends of the main cutting edge; a planar support flank below the secondary clearance surface, the secondary clearance surface forming a transition between the concavely arched primary clearance surface and the planar support flank; and the insert having a square basic shape and including four main edges and four wiper edges, each wiper edge of which is situated along the same clearance side as one main edge, transforms into the first end of the one main edge, and is countersunk to a lower level than the one main edge; wherein the individual wiper edge is an upper borderline of a lip projecting in relation to the secondary clearance surface, the lip having a tertiary clearance surface, which along one side of the insert transforms into the primary clearance surface on the same one side of the insert via a transition surface, wherein the secondary clearance surface extends under the tertiary clearance surface, the primary clearance surface having a width that decreases from the two opposite ends thereof toward a section having a smallest width therebetween at an area where the individual main edge is concave and the secondary clearance surface is convex, and wherein a clearance angle of the primary clearance surface increases from the second end to the first end of the main cutting edge.