Composite poppet valve and method for manufacturing same.

摘要

A method for making a composite poppet valve, and a poppet valve fabricated using that method. A composite slug is formed of a cylindrical core of a light weight metal such as titanium to which is fixed as by friction welding a disc or cup shaped element of a wear resistant cladding material such as steel. The composite slug is first extruded, wear resistant material first, through an extrusion die to form a blank followed by a restriking process to form the head portion of the valve into its final shape. The configurations and proportions of the core and cladding material are controlled to produce a poppet valve having a light weight core and a wear resistant cladding which varies in extent from defining the tip of the valve with cladding extending part way up the stem to a configuration wherein the cladding material completely encapsulates the core material. <IMAGE>