PISTON AND METHOD OF MAKING A PISTON

摘要

A one-piece piston (20) including a combustion bowl (26) which is cast to its final form and includes at least one irregularity spaced from a central axis (A). The piston (20) is initially fabricated of an upper crown member (22) and a lower crown member (24), which are joined together. The piston (20) is then chucked into a machine tool (54), such as a CNC lathe, which locates either the piston's top surface (32) or a portion of the combustion bowl (26) and establishes its location as a datum plane. It is this datum plane which serves as a reference location for subsequent machining operations of the piston (20).