Polygonal cutting insert

Details Polygonal cutting insert Polygonal cutting insert

1997-06-06

1999-07-13

Pitts, Andrea L.

Cutters, for shaping

Including tool having plural alternatively usable cutting edges

With integral chip breaker, guide or deflector

407113, 407115, 407116, B23D 1528, B26D 100, B26D 300

Patent

active

059217227

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a polygonal cutting insert with at least one raised longitudinal rib-shaped cutting element arranged on the face of the insert at a distance from the cutting edge and extending longitudinally to define a longitudinal axis. The elongated cutting rib is arranged substantially in the chip removal direction, whereby the longitudinal rib section, seen in the direction of chip removal, has a maximum.


BACKGROUND OF THE INVENTION

Such a cutting insert is described for instance in DE 42 39 236 A1. The longitudinal ribs described therein have in there longitudinal section a minimum and a maximum in a region away from the cutting edge, or are at the same level as a central face plateau raised with respect to the cutting edges or corners. Seen in cross section, the longitudinal ribs can have a constant width over their entire longitudinal axis or can become wider towards a region located at a distance from the cutting edge. In the case of relatively large initial curvature radii of the removed chip, particularly when the cutting element is used with small advance, these ribs make it possible to bend up the chip as much as possible. In the case of high advance rates, due to the maximum or greatest height located at a distance from the cutting edge it is possible to act counteract a very small initial curvature radius, i.e. a very tight curling of the chip.
A cutting insert having longitudinal ribs with a parabolic cross section, arranged along the cutting edge at identical acute angles, is described in DE 41 18 070 A1. Cutting inserts with longitudinal ribs having at least one recess reaching up to the cutting face, are described in the WO 92/21467. Finally there are also known cutting inserts with raised cutting elements or a median raised face plateau which has nose-like or wedge-like projections pointing in the direction of the cutting corner or cutting edge.


OBJECTS OF THE INVENTION

It is an object of the present invention to provide a cutting insert suitable for turning, lancing, milling and like machining operations, particularly for steel and for materials with relatively difficult chip control, such as highly alloyed steel and titanium-aluminum alloys, whose face geometry forms the removed chip during cutting in the region immediately adjacent to the cutting edge, without allowing the removed chips to put undue strain on the cutting insert itself.
Another object of the invention is to provide an improved cutting insert which has wear-resistant ribs, capable of withstanding even the strong friction, resulting from roughing-down operations or due to the type of material machined.


SUMMARY OF THE INVENTION

These objects are achieved by a cutting insert wherein, according to the invention, a the longitudinal rib has a ascending slope or inclined flank facing the cutting edge and which widens towards a region spaced away from the cutting edge and reaches its greatest width in the region of the maximum cross section of the rib. The longitudinal rib has an upper surface or flank descending and narrowing from the region of the maximum to a region further away from the cutting edge and the region of the maximum projects above the cutting edge.
This cutting insert can insure that the chip is bent away from the face of the cutting insert immediately behind the cutting edge by the ascending slope, whereby the cutting insert is noticeably relieved after the chip slides away over the maximum of the longitudinal rib. The described longitudinal rib offers optimal chip guidance counteracts the lateral deflection of the chip. Besides the friction of the chip against the face is kept as low as possible.
The longitudinal rib can have longitudinal axis which is set at an angle between 30.degree. and 150.degree., preferably between 60.degree. and 120.degree., with respect to the cutting edge. The layout of the longitudinal rib or ribs, which preferably are parallel to each other, is essentially determined by the chip removal conditions and the chip flow.
In order to provide a

REFERENCES:
patent: 4674924 (1987-06-01), Carlson et al.
patent: 4846609 (1989-07-01), Bernadic et al.
patent: 4992008 (1991-02-01), Pano
patent: 5460464 (1995-10-01), Arai et al.
patent: 5765972 (1998-06-01), Ericksson et al.

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