Piston for swash-plate type compressor and manufacturing method of the same

摘要

The manufacturing of a piston (6) for a swash plate compressor comprises the following steps: An Al-Si alloy containing 7 to 18wt% of silicon is die casted and therefore needs not to be melted in a sand mold to refine (finely disperse) the eutectic Si phase in order to increase shock resistance. The die casting includes quenching (rapid cooling) of the aluminium alloy, to influence the shape of the eutectic silicon particles. Before the step of the quenching of the molten alloy, Na or Sr are added in quantities ranging from 20 to 1000ppm either simultaneously or independently. The spherically shaped silicon particles increase wear resistance of the piston, because stress concentrations in the material can be avoided during piston operation. <IMAGE>