Cutters – for shaping – With chip breaker – guide or deflector – Comprising concave surface in cutting face of tool
Patent
1990-01-11
1990-11-27
Terrell, William E.
Cutters, for shaping
With chip breaker, guide or deflector
Comprising concave surface in cutting face of tool
407117, B23B 2708
Patent
active
049732048
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates generally to an arrangement in cutting inserts and more particularly to an arrangement in cutting inserts for turning tools.
In turning with conventional tools, axial turning in lateral direction, facing etc are carried out by means of a cutting insert, and severing and deep radial and axial plunge cutting by means of a recessing tool.
A characteristic feature of cutting inserts and recessing tools is their small extent in axial direction. The small width prevents unnecessary waste of material during severing and facilitates plunge cutting of grooves of smaller width.
Recessing tools frequently cause difficulties, especially with "difficult" materials, in that the chips may wedge in the groove and be carried along, damaging both to the tool and the workpiece.
SUMMARY OF THE INVENTION
One object of the invention is to provide a cutting insert designed to improve chip-forming and guiding in a variety of materials of different workability, the chips being guided away from the cutting area and gradually broken up, such that the risk of tool damages or deterioration of quality is reduced.
A conventional tool for axial turning or facing can be of large extent in axial direction and cannot be used for severing or plunge cutting. In normal turning work, it is therefore necessary to use several types of tools. Another object of the invention is to provide a cutting insert which can be used both for radial plunge cutting, severing, axial plunge cutting and for axial turning in lateral direction, facing and copy-turning, i.e. a cutting insert which can operate in all directions in the plane under production conditions.
A still further object is to provide a cutting insert which can also be used for turning of materials which normally require a large positive rake, for example high alloy stainless steel, acidproof steel, heat-resisting steel and non-ferrous metals such as aluminium, copper, brass etc.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the cutting insert according to the invention will be described in detail with reference to the accompanying drawing which shows a greatly enlarged cutting insert. In the drawing,
FIG. 1 is a side view of the preferred embodiment of the cutting insert,
FIG. 2 is a view from the cutting edge end of the same cutting insert,
FIG. 3 is a top plan view of the cutting insert, and
FIG. 4 is a cross-sectional view taken along line A--A in FIG. 3.
DETAILED DESCRIPTION OF THE INVENTION
The cutting insert comprises, in the embodiment shown, a body of so-called cutting alloy or sintered material. The lower side of the cutting insert 1 is formed with a longitudinal ridge 2 to be received in a complementary groove in a recess formed in a cutting insert holder. The rear portion 3 of the cutting insert consists of a projection which is lower than the rest of the cutting insert, and the surface of this projection extending substantially in parallel with the lower side is adapted to form an abutment for a clamping arm mounted on the cutting insert holder and actuated by a screw or the like to keep the cutting insert stable in the groove of the holder, the rear end surface 4 of the cutting insert being engaged with the rear wall of the recess of the holder. The lower portion 5 of the cutting insert, which also comprises the projection 3 has substantially parallel lateral surfaces 6, but at the front portion of the cutting insert, the lateral surfaces 7 diverge upwardly such that the lateral surfaces at the main section of the insert body portion ahead of the projection 3 are inclined outwardly, as seen from the underside. Also the front end surface 8 of the cutting insert is inclined outwardly, as seen in the same direction. The major cutting edge 9 of the cutting insert is formed at the upper edge of the front end surface 8 of the insert body at the location where this end surface meets the cutting surface 10. As seen from the major cutting edge 9, the cutting insert also has a rearwardly directed taper to allow
REFERENCES:
patent: 4776733 (1988-10-01), Petterson
patent: 4778311 (1988-10-01), Niemi
Johns S. Keating
Terrell William E.
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