Metal working – Method of mechanical manufacture – Repairing
Patent
1981-03-20
1984-12-11
Goldberg, Howard N.
Metal working
Method of mechanical manufacture
Repairing
294011, 2940207, 295276, B23P 702, B22D 11126
Patent
active
044869380
ABSTRACT:
A process of remanufacturing drilling fluid pump cylinder liners to increase the liner working life and to improve the same involving the steps of: procuring a used liner having a hard metal alloy inner layer from a pump cylinder, and removing portions of the interior metal surface so as to form an enlarged diameter, accurately dimensioned cylindrical surface in the liner. The remanufactured liner is then supplied for use with a specially manufactured piston having an enlarged diameter. Sequential remanufacturing steps can be carried out following several pumping and use cycles so that an orginal liner can be remanufactured multiple times. Prior to the procuring step, the worn liner can be checked while it is retained in the pump cylinder to determine whether extraction is necessary. If desired, the liner can be cleaned by a number of procedures and the outer diameter and configuration checked and, if necessary, resurfaced to restore the original outer surface dimensions. The metal removing step is carried out by honing or by internal grinding.
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Goldberg Howard N.
Rising V. K.
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