Cutting insert, especially for milling

Details Cutting insert, especially for milling Cutting insert, especially for milling

1996-10-16

1998-11-24

Pitts, A. L.

Cutters, for shaping

With chip breaker, guide or deflector

407113, 407114, B23C 520

Patent

active

058398589

DESCRIPTION:

BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATIONS

This application is the US national phase of PCT application PCT/DE95/00435 filed 7 Jun. 1994 with a claim to the priority of German patent application P 44 19 839.6 filed 7 Jun. 1994.


FIELD OF THE INVENTION

The invention relates to a cutting insert for material-removing machining, in particular for milling, with a cutting face which has recesses which are arranged in a row along a cutting edge and which deform the chip transversely of its travel direction.


BACKGROUND OF THE INVENTION

German patent document 2,849,610 describes a cutting insert of this type which has recesses along the cutting edge whose width or greatest dimensions parallel to the cutting edge are larger than the spacings between adjacent or succeeding recesses. These recesses extend into the cutting face and have a generally sharp edge at the transition from the cutting edge to the cutting face. The recesses are either circular or have a generally rounded shape.
U.S. Pat. No. 3,973,308 describes a cutting insert with a bevel between the cutting edge and the cutting face and recesses which interrupt the edge of this face at the inner portions of the cutting face. The recesses are either generally rectangular or tapered away from the cutting edge, that is generally triangular.
U.S. Pat. No. 4,880,338 describes a cutting insert with a central raised plateau between which and the cutting edge is arranged a groove-like recess extending along the cutting edge as well as if necessary a bevel immediately at the cutting edge. The rising flanks and parts of the plateau are interrupted by generally drop-shaped recesses.


OBJECT OF THE INVENTION

It an object of the present invention to improve the cutting insert of the described type so that shaping and deflecting of a passing chip and its stabilization are improved, with the chip being subject to minimal friction on passing over the cutting face and the cutting force being held very small.


SUMMARY OF THE INVENTION

This object is attained by the cutting insert which is characterized in that the recesses widen to their rear ends away from the cutting edge preferably conically straight and a rib-shaped raised region is provided between a cutting edge and the first recess with a longitudinal axis which is arranged parallel to or forms the edge of the recess closest to the cutting edge.
Two things are important, namely that the passing chip undergoes at the flank closer to the cutting edge a deformation and deflection and is bent by the rib transversely to the travel direction while the opposite flank of the recess stabilizes the chip movement. Unlike in the embodiments known from the prior art the recesses get wider toward their rear ends so that the chip is advantageously not subjected to compression caused by increased friction.
Thus the recesses are generally trapezoidal in section parallel to the cutting edge and have lateral opposing flanks. Preferably this trapezoidal shape changes from a parallel plane close to the cutting edge to one remote therefrom such that the "base" as well as the "roof" increase in size. The trapezoidal shape has advantages in the plastic deformation of the chip transverse to its travel direction.
The edges of the lateral flanks (seen in top view) form with each other an angle of at least 5.degree. forming the conical widening. Preferably the angle is between 5.degree. and 15.degree.. According to a particular embodiment of the invention the edge of the recess closest to the effective cutting corner forms with a perpendicular to the cutting edge an angle between 5.degree. and 25.degree.. A positive angle is such an angle that is measured clockwise.
The edges remote from the effective cutting edge form with a perpendicular to the cutting edge a positive angle, preferably both corners of the edge line having positive values and the angle of the edge remote from the cutting edge to the perpendicular being bigger than the angle of the edge close to the cutting edge.
The flanks are generally planar, preferably rounded where th

REFERENCES:
patent: 4988242 (1991-01-01), Pettersson
patent: 5630681 (1997-05-01), Paya

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