Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1978-05-11
1979-10-23
Moon, Charlie T.
Metal working
Method of mechanical manufacture
Assembling or joining
29460, 228175, 228176, 264262, B21D 3900, B23P 1904
Patent
active
041715608
ABSTRACT:
A steel wear belt having a prepared inner surface with an inner diameter large enough to pass over the weld upset on one end of a drill pipe tube but too small to pass over the tool joints is installed about the pipe over a prepared outer peripheral surface thereof. The belt is installed prior to one or both tool joints being welded to the tube. The belt is secured to the tube by injection molding a mounting layer of high polymer material, e.g. plastics or elastomer, preferably self bonding and thermo-set, between the prepared surfaces. There is employed a diametrally split mold disposed about the belt and wedged together by tapered end rings. The rings have inner diameters large enough so they can be removed by passing over the tool joints if they are attached to the ends of the tube before securement of the wear belt. The pipe is plastics coated internally from tool joint to tool joint. The plastics of the internal coating and the polymer of the wear belt mounting are cured. Preferably both coating and mounting are cured simultaneously at the same cure cycle times and temperatures. To that tend the pipe coating and belt mounting may both be made of phenolic or epoxy, or preferably, phenolic-epoxy synthetic resin. Independent of that end, an elastomer would be preferred for the belt mounting.
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Conley Ned L.
Moon Charlie T.
Robinson Murray
Rose David Alan
Smith International Inc.
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