Cutting insert for grooving

Details Cutting insert for grooving Cutting insert for grooving

1999-05-24

2001-05-29

Tsai, Henry (Department: 3722)

Cutters, for shaping

Including cut off tool

C407S114000, C407S116000

Reexamination Certificate

active

06238147

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a cutting insert for grooving operations. In particular, the present cutting insert according to the invention is suitable for radial grooving, although it also can be used for various axial grooving and parting off operations, as well as for axial and radial longitudinal turning operations.
During such machining, chip breaking and chip formation are often of decisive importance for undisturbed production. Modern high productive machines put very high claims on good chip transport. Long uncontrollable chips can easily cause machine interruptions and cessation. Chip control must therefore be given high priority and governs to a high degree the tool design.
Cutting inserts intended for grooving operations and parting off are usually clamped in a holder, which is blade shaped in order to be useful in the slot produced. The expression “holder of blade type” is also intended to comprise slot mills. Such cutting inserts are for example known from U.S. Pat. No. 4,778,311, U.S. Pat. No. 4,992,008, U.S. Pat. No. 5,135,336 and U.S. Pat. No. 5,423,639. At the same time, it is necessary to be able to obtain an improved surface finish of the surfaces in the slots produced. A first purpose is to produce a cutting insert, which is well suited to give improved finish of the surfaces in the slot produced in a work piece.
It is another purpose of the present invention to produce a cutting insert, which is well suited for repeated radial grooving.
It is a third purpose to produce a cutting insert, which gives the possibility to achieve good surface roughness in combination with high feed and good chip control.
It is a fourth purpose with the present invention to produce a cutting insert which also can be used for longitudinal turning in particular on the bottom surface of a widened slot.
SUMMARY OF THE INVENTION
These and other purposes have been achieved by a metalcutting insert comprising a shank portion and a cutting head. The shank portion defines a longitudinal axis, and the cutting head is located at a longitudinal end of the shank portion. The cutting head includes an upper surface, a bottom surface, two side clearance surfaces each extending between the upper and bottom surfaces, and a front clearance surface disposed between the side clearance surfaces and extending between the upper and bottom surfaces. An intersection between the upper surface and the front clearance surface forms a main cutting edge extending generally perpendicular to the longitudinal axis. The intersection between the upper surface and each side clearance surface defines a side edge having a clearance angle. The upper surface includes a pair of ridges extending generally longitudinally on opposite sides of the longitudinal axis and spaced apart to define a chip-forming recess between one another. The cutting insert further includes corner cutting edges extending between respective ones of the side edges and the main cutting edge. Each corner cutting edge includes a primary curved edge extending from the main cutting edge, and a curved wiper edge extending from the primary curved edge to the side edge. The primary curved edge has a smaller radius of curvature than the curved wiper edge.


REFERENCES:
patent: 4778311 (1988-10-01), Niemi
patent: 4992008 (1991-02-01), Pano
patent: 5040930 (1991-08-01), Zinner
patent: 5135336 (1992-08-01), Noguchi et al.
patent: 5423639 (1995-06-01), Wiman
patent: 5634745 (1997-06-01), Wiman et al.
patent: 5827017 (1998-10-01), Tagstrom et al.
patent: 000409143 (1991-01-01), None
patent: 1521529 (1989-11-01), None

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