Cutting insert

Details Cutting insert Cutting insert

1996-07-30

1998-08-25

Howell, Daniel W.

Cutters, for shaping

Including tool having plural alternatively usable cutting edges

With integral chip breaker, guide or deflector

407113, B23B 2714

Patent

active

057977070

DESCRIPTION:

BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS

This application is a national stage application of PCT/DE 95/00079 filed 23 Jan. 1995, published as WO95/20451 Aug. 3, 1995 and based, in turn, upon German National application P 4402759.1 of 31 Jan. 1994 under the International Convention.


FIELD OF THE INVENTION

The invention relates to a cutting insert for machinery with a plate-liked body, at least one support surface and a cutting edge, each associated with at least one face and a flank.


BACKGROUND OF THE INVENTION

Cutting inserts of the mentioned kind are known in large numbers and in various forms and shapes. Essential criteria for almost any cutting insert are its machining efficiency, tool life and the type and shape of the formed chips. Furthermore in order to exert a favorable influence on chip formation various steps have been taken in the region of the faces close to the cutting edges. However so far these steps have not been fully satisfactory.


OBJECT OF THE INVENTION

Therefore it is the object of the invention to provide a cutting insert with a particularly high machining efficiency and a long tool life, and which produces short chips.


SUMMARY OF THE INVENTION

In order to achieve this object the invention proposes that at least one bulging chip-forming element or bulge be provided on the face.
The bulge-shaped chip-forming element lifts the forming chip from the face and thereby reshapes it. As a result the chip breaks very quickly or winds itself due to the force to which it is subjected after chip removal by running against the chip-forming bulge. Further due to the hump-like chip-forming element or elements, only an extremely short contact is made between the chip and the cutting insert so that the contact surface is also extremely small. This again has a very favorable influence on the heat transfer from the chip to the cutting insert.
In a further development of the invention, only relatively few hump-like chip-forming elements are arranged on the face, which in addition are also relatively high.


BRIEF DESCRIPTION OF THE DRAWING

The above and other objects, features, and advantages will become more readily apparent from the following description, reference being made to the accompanying drawing in which:
FIG. 1 is a perspective view of the cutting insert to an enlarged scale;
FIG. 2 is a broken away section through the cutting insert along line II--II in FIG. 1, to even a more enlarged scale;
FIG. 3 is a section as in FIG. 2 through a modified embodiment;
FIG. 4 is a perspective view of a further modified cutting insert on a different, also to an enlarged scale;
FIG. 5 is a perspective view of a further embodiment example, to a larger scale and in section;
FIG. 6 is a view as in FIG. 5 of yet another embodiment;
FIG. 7 is a view as in FIGS. 5 and 6 of a final embodiment; and
FIG. 8 is a section along line VIII--VIII in FIG. 7.


SPECIFIC DESCRIPTION

A cutting insert 1 according to FIG. 1 comprises a plate-shaped body 2 with a support surface 3 serving as a base, and cutting edges 4 and 5 in the region of a side 6 opposite the support surface 3. The cutting edge 4 can serve for instance as a major cutting edge and the cutting edge 5 as a minor cutting area, adjacent respectively to the faces 7 and 8, as well as the flanks 9 and 10. The faces 7, 8 are flat or are slightly curved in the form of a concave groove according to the embodiments shown in FIGS. 2 and 3.
On each of the faces 7 chip-forming elements 11 are arranged. These chip-forming elements 11 are bulge-like projections or humps 12, whose contour rises clearly above the face 7. They gradually rise from the face 7 and after reaching their maximal height, gradually descend again towards face 7. This applies to their contours as seen in the longitudinal direction of the face 7, as well as transversely thereto, whereby in any case the chip-forming elements 11 have a bigger length than width. The main axis of each hump thus extends in the moving direction of the chip.
The contour of the chip-forming element 11 is concave where

REFERENCES:
patent: 4318645 (1982-03-01), McCreery
patent: 4359300 (1982-11-01), Harzra et al.
patent: 5116167 (1992-05-01), Niebauer
patent: 5123788 (1992-06-01), Friedrichs et al.
patent: 5372463 (1994-12-01), Takahashi
patent: 5577867 (1996-11-01), Paya
1991 Derwent Publications Ltd. Abstracts of Soviet Union patent 1611-583-A, 25 Oct, 1988.

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