Patent ID: 8550753

Claim:
A face mill for fine milling, comprising: a basic body that is rotatable around a center axis (C 1 ) in a predetermined direction and has a front end surface as well as an envelope surface concentric with the center axis (C 1 ); and a replaceable milling insert that is mounted in a seat and has the shape of a polygon that includes a front side, a back side and a plurality of side surfaces, which converge in pairs into corners and at least one of which forms a chip surface that, together with the front side, delimits a cutting edge, which is tangent to an imaginary reference plane (RP) that extends perpendicular to the center axis (C 1 ) and is axially spaced apart in the forward direction from the front end surface of the basic body, the front side of the milling insert being tilted at a clearance angle (ε) in relation to the reference plane (RP), the cutting edge of the milling insert extending between two end points, a first one of which, during the rotation of the mill, is heading the second one as well as moves in a circular path, the radius of which is smaller than the radius of a circular path in which the second, rotationally trailing end point moves, the cutting edge forming a negative radial angle (δ) with an imaginary radial line (A) that extends from the center axis (C 1 ) of the basic body and intersects the first end point of the cutting edge, wherein the front side and chip surface of the milling insert mutually form a nominal angle (β) that amounts to at most 83°, and wherein the cutting edge is straight and in the entire length thereof situated in the reference plane (RP), the negative radial angle (δ) thereof amounting to at least 70 °.