Method of manufacturing a rotary rock bit

Details Method of manufacturing a rotary rock bit Method of manufacturing a rotary rock bit

1978-08-07

1979-10-30

Spruill, Robert L.

Metal tools and implements, making

Blank or process

Drill

75208R, 291495PM, 308 82, 308237, B21K 502, B21D 5310

Patent

active

041723953

ABSTRACT:
A rolling cone earth boring bit is produced having a bearing surface that has been infiltrated to a controlled depth. A groove is machined in one of the bearing members. The bearing member is placed in a die and an alloy powder material is pressed into the groove recess thereby producing a porous matrix for the bearing element. The bearing element is sintered to provide a porosity within the range of 10% to 20%. An anti-galling material is infiltrated into said porous matrix bearing element. The porous matrix bearing element is hardened resulting in a high-strength bearing that will provide performance with high loads at low RPM or high RPM.

REFERENCES:
patent: 2595903 (1952-05-01), Swart
patent: 2733968 (1956-02-01), Pelz, Jr.
patent: 3206264 (1965-09-01), Dalzell et al.
patent: 3235316 (1966-02-01), Whanger
patent: 3984158 (1976-10-01), Sorensen

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