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US 2020/0038948 A1Published application
Piston with cofused alfin ring and process to obtain it
AssigneeAsso Werke S.R.L.
InventorDimitri ANGUILLESI
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Abstract
The present invention relates to a process for producing a piston made of hypereutectic Al—Si alloy with a cast iron Alfin ring and a piston obtained through said process. The process according to the invention allows to obtain high adhesion of the Alfin ring to the piston body, making it particularly suitable for use in high performance engines.
Claims20
A process to produce for a piston made of a hypereutectic Al—Si alloy comprising at least one Alfin ring, comprising the steps of:
- (i) providing at least one cast iron ring;
- (ii) soaking said at least one cast iron ring in at least one aluminium plating bath comprising an Al—Si alloy comprising 8.0-12.0 wt. % of Si at the temperature of 650°-750° C.;
- (iii) extracting the cast iron ring from the aluminium plating bath and inserting it in a casting mold;
- (iv) pouring a hypereutectic Al—Si alloy comprising 16-24 wt. % of Si into the mold, at a casting temperature of 760°-900° C., thereby obtaining a piston comprising at least one Alfin ring;
- (v) cooling and extracting the piston from the mold.
2 more elements
Dependencies are inferred from the claim text.