| 摘要 |
A heavy duty insert for severe machining operations having a generally rectangular body with upstanding walls and rounded corners having a cutting edge extending around the periphery thereof and an upstanding mesa inboard of the cutting edge. To provide improved machining life the cutting edge in cross-section has an arcuate surface with a small radius merging from the walls of the body into an inclined face which is intersected inwardly of the walls by a flat land extending transversely to the walls. The maximum cutting speed and in-feed rate for machining is significantly increased by a groove interposed between the mesa and a cutting edge adjacent each side wall and having a first portion extending inwardly of and downwardly below the land of the cutting edge and a second portion defining in cooperation with a side wall of the mesa a surface extending inwardly of and upwardly above the land of the cutting edge.
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