Metal tools and implements – making – Blank or process – Drill
Patent
1978-04-03
1980-05-27
Simpson, Othell M.
Metal tools and implements, making
Blank or process
Drill
148 165, B21K 502, C21D 178
Patent
active
042044375
ABSTRACT:
A rock bit segment has a cutter rotatably mounted on a journal. Loads radially of the axis of the journal are largely taken by a friction bearing pad of hard material. Ball bearings track in circular races on the journal and cutter and retain the cutter on the journal. A seal at the junction of the journal and the balance of the segment keep lubricant from escaping from the interface between the cutter and the journal and formation material from entering this interface. To provide hardened wear surfaces for the seal on the journal and segment in the ball race on the journal, on radial surfaces of the journal adjacent the pad, and at the nose of the journal, the entire rock bit segment is subjected to a carbon enrichment of the surface after the segment has been machined. Thereafter, the segment is quenched to effect a hardened case, and then the segment is tempered. Carbon in the case varies from 0.5% to 0.9% at the surface to base metal concentrations at depth, and the case is 0.010 to 0.015 inches thick.
REFERENCES:
patent: 3275389 (1966-09-01), Neilson et al.
patent: 3661656 (1972-05-01), Jarleborg
patent: 3922038 (1975-11-01), Scales
patent: 3946817 (1976-03-01), Prince
Parker Roscoe V.
Simpson Othell M.
Smith International Inc.
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