PISTONE IN ALLUMINIO OTTENUTO CON STAMPAGGIO PER COMPRESSIONE CON RIPORTI IN MATERIALE DIVERSO PER MOTORI A COMBUSTIONE E PROCEDIMENTO PER LA SUA FABBRICAZIONE

摘要

The invention provides a piston formed by casting a metal piston body under pressure around an insert, the body being made of aluminium or aluminium alloy and the insert being made of a porous layer having a thickness 20 to 50 times the pore diameter and completely filled with the piston body metal which projects from the body into the pores of the insert.