Patent ID: 9573203
Date: 2017-02-21
CPC Classifications: B23C,Y10T

Claim:
1. A milling tool comprising: a basic body having front and rear ends, between which there extends an envelope surface and a first center axis on which the basic body is rotatable; a plurality of single sided and indexable milling inserts having a round basic shape, which individually include an upper side, an under side, and a clearance surface that extends between the upper and lower side, a portion of the clearance surface bordering the upper side converging toward the underside to provide a positive cutting geometry of a cutting edge positioned between the clearance surface and a chip surface included in the upper side, the cutting edge including a reinforcing chamfer surface that is delimited against the clearance surface via an outer boundary line and against the chip surface via an inner boundary line, the upper and under sides in the milling insert being determined by upper and lower reference planes, each of the reference planes extending perpendicular to a second center axis of an imaginary cylinder that circumscribes the periphery of the upper side and defines the round basic shape of a milling insert, wherein in the clearance surface of the individual milling insert, a plurality of tangentially spaced-apart and plane side contact surfaces are formed, two of which are pressed against a side support surface in the seat; and a seat formed in a transition between the front end and the envelope surface of the basic body, wherein each of the plurality of milling inserts being fixed in the seat by a tightening device and co-operating lock means disposed in the seat of the basic body and the respective milling insert so as to counteract rotation of the milling insert, the milling insert being located in a spatial position that is tipped-in in the basic body and determined by an axial tipping-in angle, as well as by a radial angle, wherein each of the plurality of milling inserts is formed with a plurality of tangentially spaced-apart and alternately usable cutting edges, each of the cutting edges falling archedly from a first end bordering the upper reference plane of the milling insert, to a lowest point, from which a respective cutting edge rises toward a second end, the inner boundary line of the chamfer surface diverging from the outer boundary line so as to give the chamfer surface an increasing width in a direction from the first end of the cutting edge toward the second end thereof, wherein the lock means for rotationally securing each milling insert in the individual seat of the basic body has a first connecting surface that is formed in a bottom of the individual seat and includes a plurality of radially oriented ridges and countersinks between the ridges, and a second connecting surface that is formed in the underside of the milling insert, the second connecting surface including a plurality of radially oriented ridges and countersinks, the ridges of the second connecting surface engaging the countersinks of the first connecting surface at the same time as countersinks of the second connecting surface receive the ridges of the first connecting surface, the side contact surfaces of the milling insert being located in the same radial plane as the ridges of the second connecting surface of the milling insert.