Cutting insert with narrow face segment between depression and e

Details Cutting insert with narrow face segment between depression and e Cutting insert with narrow face segment between depression and e

1995-11-16

1997-08-26

Howell, Daniel W.

Cutters, for shaping

Including tool having plural alternatively usable cutting edges

With integral chip breaker, guide or deflector

407117, B23B 2704, B23B 2716

Patent

active

056605072

DESCRIPTION:

BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS

This is a national phase of PCT/DE94/00560 filed on 10 May 1994 and based, in turn, on German application P4321426.6 filed 28 Jun. 1993 under the International Convention.


FIELD OF THE INVENTION

The invention relates to a cutting insert for chip-removal machining, particularly for milling, turning or punching, with at least one cutting edge and at least one adjacent chamfer, into which project adjacent depressions or recesses at a distance from the cutting edge, defining narrowed segments.
Such cutting inserts are known for instance from EP 0 208 668 B1, whereby a chamfer is adjacent to the cutting edge under a 0 degree chamfer angle or a negative chamfer angle, into which project a number of depressions or recesses, which are arranged along the cutting edge separated from each other and at a distance from the cutting edge. Moreover the depressions and recesses project into the curved face continuing the chamfer towards the cutting insert middle.
Patent corresponding cutting insert is also shown by U.S. Pat. No. 5,180,258, wherein a positive chamfer is continued with a downward sloping flank towards the middle of the face of the cutting insert. This flank has indentations with a trapezoidal cross section which reach down to the depressed middle of the face bottom.
From EP 0 360 774 A2 a polygonal cutting insert is known which is supposed to have on its face a multitude of ribs, the distance between them decreasing in the direction of the cutting insert center. Between the ribs there are synclinal depressions, whose deepest point is supposed to lie below the cutting edge plane. These depressions extend in a partial area in a negative chamfer continuing the cutting edge. This tool is supposed to insure that the chip is deflected from the tool during machining.
The DE 28 40 610 A1 describes a cutting insert for improving chip breaking and chip removal, even under strongly variable cutting conditions. The cutting insert has indentations along the cutting edge or cutting edges in an uninterrupted succession, which are shaped so that their width or biggest extent parallel to the cutting edge is greater than the distance between two neighboring or successive indentations. These indentations interrupt the cutting edge and towards the rear end are shaped with a very sharp edge towards the face. The face can be additionally provided with a chamfer running along the cutting edge, whose width decreases from the cutting edge corner towards the cutting edge middle.
The cutting insert according to EP 0 414 241 A2 has notches on the relief flank as well as on the face, which in the area of the cutting edge run into each other, whereby the cutting edges recede in the notched areas with respect to the remaining cutting edge areas. The respective trapezoidal shape has sharp edges and because of that a targeted long tool life can not be achieved, except under certain conditions. Besides the friction created on the face during chip flow removal is very high. This cutting insert can only be used for a specific finishing operation.
In the WO 93/11898 a cutting insert for rough machining of metallic workpieces at high advancement rates is described, wherein for improving the chip removal flow during cutting indentations lying along the cutting edge form a trapezoidal shape in a cross section lying parallel to the cutting edge and perpendicularly to the face, whose trapezoidal flanks are opened towards the face, whereby the face bottom tapers off towards the cutting edge at a negative angle or a cutting angle of 0.degree. and the face has a positive cutting angle in the area between indentations and the cutting edge.


OBJECT OF THE INVENTION

It is the object of the present invention to provide a cutting insert which makes possible a very soft and friction-poor cutting, with a stabilized cutting edge and by means of which high advance rates are possible.


SUMMARY OF THE INVENTION

This object is achieved due to the cutting insert according to claim 1, which is characterized in that dep

REFERENCES:
patent: 4159884 (1979-07-01), Schott
patent: 5137396 (1992-08-01), Durschinger
patent: 5180258 (1993-01-01), Bernadic

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