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US 5,330,296 AGranted
Ceramic cutting tool with chip control
AssigneeKennametal Inc.
InventorsCraig W. Beeghly, Deepak P. Ahuja, Pankaj K. Mehrotra, Kenneth L. Niebauer
Life of this patent
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Abstract
A ceramic cutting insert for high speed machining of materials is provided having an integral chip control surface thereon.
Claims17
A ceramic cutting insert comprising:
- a rake face having an integral as molded means for providing chip control;
- a flank face;
- a cutting edge at the junction of said rake face and said flank face;
- wherein the included angle respectively formed by said rake face and said flank surface at the cutting edge is less than 90 degrees;
- and
- wherein said ceramic has a transverse rupture strength of at least 80 ksi and a fracture toughness of at least 5 MPam.sup.1/2.
3 more elements
A method for the high speed machining of metallic materials, comprising the steps of:
- machining said metallic material at a speed of 500 to 5,000 sfm, a feed of 0.002 to 0.020 ipr, and a depth of cut of 0.015 to 0.500 inch, with a cutting edge of a ceramic cutting insert having a positive rake surface with an integral as molded means for chip control thereon;
- and
- wherein chips formed during said machining have a desired and controllable configuration.
An indexable ceramic cutting insert comprising:
- a top rake face;
- a bottom rake face;
- a flank face joining said top rake face and said bottom rake face;
- a first cutting edge formed at the juncture of said top rake face and said flank face;
- a second cutting edge formed at the juncture of said bottom rake face and said flank face;
- a first as molded chip control groove in said top rake face;
- a second as molded chip control groove in said bottom rake face;
- and
- wherein said ceramic has a transverse rupture strength of at least 80 ksi and a fracture toughness of at least 5 MPam.sup.1/2.
6 more elements
A ceramic cutting insert for high speed machining of materials comprising:
- a flank face;
- a rake face;
- a cutting edge at the juncture of said flank and said rake faces;
- wherein said rake face includes as molded means for controlling chip forming, during said high speed machining of materials;
- said insert having a ceramic composition characterized by a transverse rupture strength of at least 80 ksi, a fracture toughness (K.sub.IC) of at least 5 MPam.sup.1/2.
2 more elements
An indexable ceramic cutting insert comprising:
- a first cutting edge extending in a first direction;
- a second cutting edge extending in a second direction and joined to said first cutting edge at a corner of the insert;
- a rake face with an integral means for controlling chip formation extending along said first cutting edge, said second cutting edge and said corner of said insert;
- wherein said first cutting edge and said second cutting edge define a plane;
- a surface of said means for controlling chip formation extending below said plane, and said surface is in an as-molded condition;
- and
- wherein said indexable ceramic cutting insert is composed of a ceramic composition having a transverse rupture strength of at least 80 ksi and a fracture toughness of at least 5 MPam.sup.1/2.
4 more elements
Dependencies are inferred from the claim text.