| 摘要 |
A cutting tool made of a material that retains its cutting effectiveness at temperatures over 1200 DEG F., and including a chip breaker geometry, for the continuous machining of metal, having a first top generally planar surface and an end surface which join to define the cutting edge of the tool and which join at an included angle such that the tool has a relatively high positive rake angle. A second top generally planar surface extends from the first top surface away from the cutting edge and forms an included angle with the first top surface of between about 125 DEG and 145 DEG . The upper surface of the tool at the other end of the second top surface drops below the second top surface. This allows a chip formed during machining to move from the cutting edge, over the first and second top surfaces, and relatively unobstructed past the edge of the other end of the second top surface. The lengths of the first and second top surfaces are approximately equal and the edge at the other end of the second top surface lies below the cutting edge of the tool. The tool may be formed as a polygonal shaped insert.
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