| 摘要 |
The disclosure concerns steel cylinder barrels for piston pumps and motors having bonded non-steel valve plates. The valve plate comprises a sintered iron powder matrix which is impregnated with bronze and is metallurgically and mechanically bonded to one end of the steel cylinder barrel. The valve plate is made from a porous sintered iron blank which is mounted in contact with one end of a steel barrel blank in an assembly which includes a mass of bronze in the solid state. The assembly is heated in a non-oxidizing atmosphere to a temperature between 1900 DEG F and 2000 DEG F to melt the bronze and cause it to infiltrate the sintered valve plate blank and bond to the steel. Thereafter, the assembly is cooled in the non-oxidizing atmosphere to solidify the bronze, followed by air cooling to room temperature. Finally, the finished valve plate is machined from the bronze-impregnated sintered preform.
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