Earth boring bit with gridded ferrous bearing surface

Details Earth boring bit with gridded ferrous bearing surface Earth boring bit with gridded ferrous bearing surface

E - Fixed Constructions

21

B

76/21, 255/77

E21B 10/00 (2006.01) B21K 5/02 (2006.01) B21K 5/06 (2006.01) E21B 10/22 (2006.01) F16C 33/24 (2006.01)

Patent

CA 1107716

EARTH BORING BIT WITH GRIDDED FERROUS BEARING SURFACE Abstract of the Disclosure A rolling cone cutter earth boring bit is provided with a bearing surface having a substantial amount of anti- galling material throughout the load area of the bearing. A rough machined bearing surface is provided with either a male or female gridded surface through the use of a fine-toothed knurling tool. Anti-galling material is applied to the gridded surface. The bearing is heat treated by conventional quench and temper procedures to provide strength to the fer- rous alloy; however, special heat treating and/or carburizing is not required. Excess anti-galling material is removed by machining and/or grinding the bearing surface until a network or grid of the ferrous material is clearly discernible. The bearing provides adequate support for applied loads and sub- stantial amounts of anti-galling material for boundary layer lubrication situations in close proximity to the load bearing area.

332459

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