Method of producing cylinder heads, and cylinder head produced thereby

A method of producing partially reinforced cylinder heads, particularly of internal combustion engines, comprising in combination the steps of:

• providing a pre-formed workpiece including a valve bridge, valve seat, valve fillet, valve web and made of a predetermined material composition;
• and
• casting on said workpiece a high-alloy fatigue-resistant material for high heat stability capable of producing a bond with said predetermined material composition in areas of maximum thermal and mechanical stresses for forming a positive connection between said workpiece and said casting of high-alloy fatigue-resistant material to reduce possibility of valve bridge cracks by increasing creep strength, said pre-formed workpiece including at least one fusible portion, said method further including the steps of:
• alloying said predetermined material composition of said preformed workpiece in a composition including by weight percent,
• ______________________________________ C 3.0 maximum Si 1.7-2.2 Mn 1.0-1.5 Ni 18-22 Cr 1.8-2.4 Nb 0.1 Mg 0.05 Fe Balance ______________________________________
• and wherein said casting material includes a cast iron composition for cylinder heads of internal combustion engines,
• supporting said pre-formed workpiece in a predetermined position, whereby said at least one fusible portion faces downwardly;
• and
• casting said material in such a way that said casting material rises at said at least one fusible portion.