Earth boring tool with improved inserts

Details Earth boring tool with improved inserts Earth boring tool with improved inserts

1976-02-13

1980-07-08

Vlachos, Leonidas

Cutters, for shaping

Miscellaneous

76108A, 175410, B26D 100, B21K 502

Patent

active

042115086

ABSTRACT:
In an earth boring tool an improved sintered tungsten carbide insert and surface conditioning method to improve retention within an interferringly sized hole and to decrease the frequency of fracture of the inserts. The insert has a randomly varied surface finish that is obtained from abrasive treatment with particles having hardness greater than 9.0 on Mohs' Scale. The particles are selected from the class consisting of silicon carbide, boron carbide, boron, and diamond. The resulting surface has asperities varying from a maximum value, smaller than that formed by grinding, to a minimum value, larger than the mat finish obtained by abrading with aluminum oxide.

REFERENCES:
patent: 2978850 (1961-04-01), Gleszer
patent: 3651716 (1972-03-01), Stebley

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