Cutting insert for grooving operations

Details Cutting insert for grooving operations Cutting insert for grooving operations

1999-05-14

2000-10-24

Wellington, A. L.

Cutters, for shaping

Including cut off tool

407116, 407114, B23B 2722

Patent

active

061356786

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a cutting insert for grooving operations, and is particularly suitable for different radial groove cutting and groove turning operations as well as the profiling of grooves with small angles, for example, the production of grooves for piston rings.
During such machining, chip breaking and chip forming often have a decisive influence on the number of interruptions in production. Modern, high productive machines put very high demands on good chip removal. Long, uncontrollable chips can easily cause breakdowns in production and result in defective components which have to be scrapped. Close attention must therefore be paid to chip control and it must be allowed to have a major influence on the design of the tool.
Cutting inserts intended for the turning of grooves and parting operations are generally clamped in holders, which are of the blade type, in order that they can be used in confined spaces. Such cutting inserts are, for example, known through U.S. Pat. No. 5,375,948 and 5,423,639.
It has been established that cutting inserts, known until now, for the radial turning of grooves have not always functioned satisfactorily. The chips are not broken adequately and chip control is substandard.
The first purpose of the present invention is consequently to produce an insert which is well suited for the repeated, radial turning of grooves.
The second purpose of the present invention is to produce an insert which can also be used for profiling and longitudinal turning, in particular the profiling of the sides of a groove with small angles.
An additional purpose of the present invention is to produce an insert which can also, in a reliable manner, carry out the first cut, during which a long, unbroken chip is generally formed.


SUMMARY OF THE INVENTION

These and other purposes have been achieved by a cutting insert for the turning of grooves in metallic work pieces. The cutting insert comprises a rear shank portion and a forward cutting head projecting forwardly from the rear shank portion. The cutting head includes a top side, an underside, two flank side surfaces each interconnecting the top side with the underside, and a forwardly facing front flank surface interconnecting the flank side surfaces. Each flank side surface forms an acute angle with the top side. A transition between the flank front surface and the top side forms a main cutting edge. A transition between each flank side surface and the top side forms a side cutting edge. The side cutting edges extend on respective opposite sides of a center line of the cutting head and converge in a forward direction. The side cutting edges form an acute angle between one another. Each side cutting edge includes a plurality of spaced-apart grooves formed therein, whereby each side cutting edge is non-continuous.


BRIEF DESCRIPTION OF THE DRAWINGS

The invention is now described in more detail with reference to the enclosed drawings in order to better clarify but in no way limit the invention.
The drawings are presented in brief herewith:
FIG. 1 shows an insert according to the invention in a view, as seen from above.
FIG. 2 shows an insert according to the invention in a side view.
FIG. 3 shows the same insert as in FIG. 2, straight from the front.
FIG. 4 shows the same insert as in FIG. 2, in an enlarged view seen straight from above.
FIG. 5 shows the section A--A in FIG. 4.
FIG. 6 shows the section B--B in FIG. 4.
FIG. 7 shows the section C--C in FIG. 4.


DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION

With reference to FIG. 1 an insert (1) is shown which is made of a hard and wear resistance material such as cemented carbide, including a rear shank portion (2) and a forward cutting head (3). The rear portion of the shank (2) comprises two substantially plane parallel side surfaces (4, 5) two upper, obliquely inward sloping edge surfaces, (6, 7) a bottom surface (8) formed in a corresponding manner, a rear end surface (9) forming a right angle with the side surfaces (4, 5) as well

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