Indexable insert with a V-shaped chip breaker

Details Indexable insert with a V-shaped chip breaker Indexable insert with a V-shaped chip breaker

1999-07-09

2001-07-31

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

06267541

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention generally relates to cutting inserts, especially metal cutting inserts with chip control that effectively break thin, foil-like chips that result from cutting of a workpiece.
2. Description of Prior Art
Cutting tools typically employ a replaceable cutting insert that is securely and accurately held in place on the cutting tool. The inserts are preferably intended for indexing so that a new cutting edge can be presented for removing metal from a workpiece once the cutting edge becomes dull or worn.
During the cutting operation, the edge engages the workpiece and creates a gap between the cut portion and the remainder of the workpiece. A chip starts to flow but remains intact with the workpiece until it engages a face of the tool, typically a face of the toolholder, which imparts a curl to the chip. During a third phase of the cutting operation the ribbon, or curl, is broken into pieces to facilitate removal from the cutting region.
Thus, the cutting operation generates a ribbon-like strip of material, usually metal, removed from the workpiece. It is important to control removal of the chip material so that it does not interfere with continued cutting operations. A great deal of time, effort, and design are associated with chip handling. Although chip breaking structures are well known in the art, there is a continuous need for improvement in the area. The insert must be able to effectively embrittle and repeatedly break the thin, foil-like chips over a wide range of chip thicknesses so that the cutting tools employing such inserts can operate effectively. In addition, the chip breaking structure should be capable of use in a wide range of insert shapes and sizes. Exemplary cutting arrangements exhibiting chip control are shown and described in U.S. Pat. Nos. 5,704,737 and 5,791,833, commonly assigned to the assignee of the present invention.
SUMMARY OF THE INVENTION
The present invention is directed to an indexable cutting insert having an improved chip breaker.
An exemplary embodiment of the invention includes an insert body having a first surface and a side relief surface with a cutting edge disposed therebetween. A chip breaking structure is disposed on the first surface inwardly from the cutting edge and includes a first series of wedges disposed adjacent one another and a second series of wedges disposed adjacent one another and substantially orthogonal to the first series of wedges.
The first series of wedges have a face disposed generally parallel to the side relief surface.
Relief faces associated with the wedges of the first and second series are disposed at an angle between 40° and 900° from the wedge face. Such angles are known as wedge included angles.
A primary benefit of the invention resides in the ability to effectively break chips generated during a cutting operation into controllable pieces.
Still another benefit of the invention is found in the adaptability of the chip breaking structure to various insert configurations.
Still other advantages and benefits of the invention will become apparent to those skilled in the art upon a reading and understanding of the following detailed description.


REFERENCES:
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patent: 5324144 (1994-06-01), Katbi et al.
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patent: 4437093 (1996-04-01), None
International Search Report mailed Oct. 2, 2000 in counterpart International Application No. PCT/US00/16454.

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