Patent ID: 7972091
Filing Date: 2011-07-05
Classification: B23C,Y10T

Abstract:
1. A milling tool for chip-removing machining, comprising a basic body rotatable around a geometrical centre axis and a plurality of peripherically spaced-apart, detachable cutting inserts, which separately are securable in insert pockets adjacent to chip channels formed in the basic body, the individual cutting insert having at least one edge formed between a chip surface on the top side of the cutting insert and a clearance surface along the periphery side of the cutting insert, the individual insert pocket is arranged to secure the individual cutting insert in a position in which the chip surface is inclined in relation to the centre axis while forming a positive angle of inclination wherein a value of the angle of inclination (θ) between the chip surface and the centre axis is within the range of 25-28°, the cutting edge cross section-wise has an arc-shape having a radius of curvature within the range of 5-20 μm, the clearance surface of the cutting insert is formed with a clearance bevel, which extends from the cutting edge in the direction of a bottom side of the cutting insert to a main clearance portion, a clearance angle (γ) of the clearance bevel is larger than 0°, but smaller than 3°, a clearance angle (ω) of the main clearance portion is larger than the clearance angle (γ) of the clearance bevel, an extension of the clearance bevel from the cutting edge to the main clearance portion is within the range of 0.05-0.30 mm, the chip surface is formed with a reinforcement bevel, which extends from the cutting edge in the direction of the centre of the cutting insert and transforms into a main chip portion, an angle of inclination (ψ) of the reinforcement bevel in relation to the centre axis being larger than −5°, but smaller than +5°, and an extension of the reinforcement bevel from the cutting edge to the main chip portion is within the range of 0.05-0.15 mm.