Tangential cutting insert

Details Tangential cutting insert Tangential cutting insert

1999-07-09

2001-05-29

Tsai, Henry (Department: 3722)

Cutters, for shaping

Including tool having plural alternatively usable cutting edges

C407S114000, C407S115000

Reexamination Certificate

active

06238146

ABSTRACT:

FIELD OF THE INVENTION
The present invention refers to a tangential (on-edge) cutting insert for mounting thereof on cutting tools for different cutting operations.
BACKGROUND OF THE INVENTION
Tangential cutting inserts are often used with rotary milling cutters such as slotting cutters or extended-flute cutters, with turning cutting tools or the like. Examples of such use may be found in U.S. Pat. No. 3,416,209, U.S. Pat. No. 3,490,117, U.S. Pat. No. 3,701,187 and U.S. Pat. No. 4,790,693.
A conventional tangential cutting insert of the kind to which the present invention refers has a prismatic body with a clamping screw bore and with an operative front surface which is generally parallel to the clamping screw bore's axis and which is associated with upper and lower cutting edges and side edges extending therebetween and merging therewith via insert comer edges. In such conventional tangential cutting inserts, the side and comer edges are usually not used in cutting operations, being consequently not provided with appropriate cutting geometry.
WO 97/17157 discloses a double-sided indexable tangential cutting insert for face milling operations in which front and rear surfaces are each associated with upper and lower main cutting edges, two auxiliary side cutting edges therebetween and four corner edges at which the main and auxiliary cutting edges meet. The front and rear surfaces are each formed with a chip groove extending along the circumference thereof between the associated cutting edges and a planar central positioning surface projecting outwardly from the cutting edges.
It is the object of the present invention to provide a new tangential cutting insert of the above kind.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided a tangential cutting insert having a body with an operative front surface associated with upper and lower main cutting edges, side auxiliary cutting edges and comer cutting edges therebetween, all cutting edges having rake surfaces formed at said front surface and extending from their associated cutting edges in an inward direction of the cutting insert, the insert having an imaginary reference plane passing through extremities of the cutting comer edges thereof; characterized in that each of said main cutting edges extends from its associated comer edges in an inward direction of the insert away from said reference plane.
Preferably, each of the main cutting edges hav two lateral component cutting edges extending from adjacent comer edges in the inward direction of the insert, and a central component cutting edge therebetween substantially co-directional with said reference plane.
Preferably, the operative front surface has two component surfaces that extend from the associated auxiliary side edges in the inward direction of the insert. By virtue of this design, the insert is provided with a pair of appropriate positioning surfaces by means of the geometry of the operative front surface generally repeating the geometry of the main cutting edges.
Preferably, the cutting insert is indexable around an axis of 180° rotational symmetry, which axis is substantially parallel to the operative front surface and substantially transverse to the main cutting edge. The body of the cutting insert has a prismatic shape with a pair of identical front and rear surfaces at two ends thereof, opposite upper and lower surfaces and a pair of opposite side surfaces extending between the front and rear surfaces.
Preferably, the rake surfaces of the cutting edges are oriented so that an acute angle formed thereby with a normal to said imaginary plane is different for the main, auxiliary and corner cutting edges. The value of this angle may vary along these cutting edges.
The cutting insert geometry of the present invention is particularly suitable for the manufacturing of cutting inserts by net-shape processes, where no grinding operations are required, by virtue of which any desired design, in particular, non-planar, of the chip rake and relief surfaces may be obtained.


REFERENCES:
patent: 2688791 (1954-09-01), Luers et al.
patent: 3128804 (1964-04-01), Scott
patent: 3416209 (1968-12-01), Contrucci et al.
patent: 3490117 (1970-01-01), Hertel
patent: 3701187 (1972-10-01), Erkfritz
patent: 4124326 (1978-11-01), Cost
patent: 4790693 (1988-12-01), Koblesky
patent: 5158402 (1992-10-01), Satran et al.
patent: 5333972 (1994-08-01), Bernadic et al.
patent: 6074137 (2000-06-01), Betman et al.
patent: 2549757 (1977-05-01), None
patent: 195 16 946 A1 (1996-11-01), None
patent: 197 04 931 C1 (1998-03-01), None
patent: WO 93/19879 (1993-10-01), None
patent: WO 97/17157 (1997-05-01), None
patent: WO 98/34747 (1998-08-01), None

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