Milling cutter with indexable inserts
AssigneeStellram S.A.
InventorsGilbert Aebi, Pierre Raye, Maurice J. A. David, Michel E. A. Marianneau
Life of this patent
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Abstract
The milling cutter comprises a body (1) having two indentations (4,5) each presenting a housing (4',5') the body of which makes with the longitudinal axis of the body a helix angle which is not equal to zero. In each housing a cutting insert (6,7) is removably fixed which comprises a tip portion emerging on the frontal face (9) of the body and a main cutting edge extending beyond and along the external lateral rim of the indentation. The position and the shape of this insert are such that the radial cutting angle is not equal to zero and is constant, and that the clearance angle is constant with a wedge angle of the insert which is also constant.
Claims9
A milling cutter having indexable inserts, comprising
- (a) a body including a front portion containing at least two indentations each defining a housing having a bottom surface which defines a positioning angle other than 0.degree. with the longitudinal axis of said body;
- and
- (b) a cutting insert removably connected with each housing and including a corner portion emerging from a face of said body front portion and a main cutting edge extending beyond and along an external lateral rim of the indentation, said insert having a rake face comprising a flat central depression and a sloped portion having an inclination which varies along its length relative to said flat central depression extending from said flat central depression to said main cutting edge and a clearance face of variable normal clearance along its length forming with said sloped portion a constant wedge angle, wherein the variable incline of the sloped portion and clearance face are selected to coact with the positioning angle to impart to the cutter a constant radial rake and clearance angle.
A cutting insert for use on a milling cutter comprising
- a cutting element having a parallelogram shape with two long sides of said element defining two main cutting edges and the two short sides of said element defining two secondary cutting edges, the included angle between the main and secondary edges being between 40.degree. and 70.degree.,
- said element including a flat central depression connected with the main and secondary edges by a sloped portion having an inclination which varies along its length relative to said flat central depression, and a clearance along its length face of variable normal clearance forming with said sloped portion a constant wedge angle, whereby when said element is connected with a cutter, at an acute angle to the axis of the cutter the cutter will have a constant clearance angle and a constant radial rake along its main cutting edge.
Dependencies are inferred from the claim text.