Cutters – for shaping – Including tool having plural alternatively usable cutting edges – With integral chip breaker – guide or deflector
Reexamination Certificate
1999-11-22
2001-06-05
Tsai, Henry (Department: 3722)
Cutters, for shaping
Including tool having plural alternatively usable cutting edges
With integral chip breaker, guide or deflector
C407S115000, C407S116000
Reexamination Certificate
active
06241430
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a turning insert for the cutting machining of metallic workpieces. More specifically the present invention relates to a turning insert with a chip former, developed foremost to be used for internal turning.
PRIOR ART
Special demands are put on a metal cutting tool during turning of internal surfaces in comparison with external longitudinal turning. Such demands involve the need for low cutting forces due to long moment arms, and controlled chip forming in order not to damage the generated surface. European Document A2-0 422 586 relates to a single sided cutting insert having an elliptical chip breaker which directs the chip in a desired direction while however presenting a risk of damaging the generated surface. From U.S. Pat. No. 4,681,487 there is previously known a double-sided cutting insert for external turning having a chip breaker both for fine and rough turning.
OBJECTS AND SUMMARY OF THE INVENTION
One object of the present invention is to provide a cutting insert, which remains stable during internal turning.
Another object of the present invention is to provide a cutting insert producing chips that do not damage the generated surface.
Another object of the present invention is to provide a cutting insert that produces low cutting forces.
Another object of the present invention is to provide a cutting insert with strong cutting corners.
Another object of the present invention is to provide a cutting insert that provides controlled chip forming.
These and other objects of the present invention are realized by a turning insert. The insert comprises a polygonal body formed of a hard material and including upper and lower surfaces disposed in substantially parallel respective planes, and a plurality of side surfaces each interconnecting the upper and lower surfaces. The body includes at least one cutting corner formed by two of the side surfaces. Those two side surfaces constitute leading and trailing side surfaces, respectively during a cutting operation. At least the upper surface includes a chip former disposed therein. The cutting corner defines a nose having a bisector plane. The chip former is asymmetrically arranged relative to the bisector plane. The chip former comprises an inclined wall having a portion situated adjacent the nose and being of convex shape as viewed in a direction perpendicular to a plane of the insert. The convex portion includes a lower edge intersected at least at two locations by the bisector plane.
REFERENCES:
patent: 3751782 (1973-08-01), Fruish
patent: 4681487 (1987-07-01), Pettersson
patent: 5676495 (1997-10-01), Katbi et al.
patent: 5779401 (1998-07-01), Stallwitz et al.
patent: 0 422 586 (1991-04-01), None
Burns Doane Swecker & Mathis L.L.P.
Seco Tools AB
Tsai Henry
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