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US 5,056,219 AGranted
Method of manufacturing hollow engine valve
AssigneeAisan Kogyo Kabushiki Kaisha
InventorSatoru Iwase
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Abstract
A method of manufacturing a hollow engine valve includes the steps of inserting a core of free-cuting metal into a pipe material of heat-resistant steel to provide a shaping stock, shaping the shaping stock into a rough valve profile of a mushroom shape, subsequently forming a hole in a central portion of said rough valve profile by cutting, and sealingly plugging an open end of the hole close to the valve mushroom portion.
Claims4
A method of manufacturing a hollow engine valve, comprising the steps of:
- inserting a core of free-cutting metal into a pipe material of heat-resistant steel to provide a shaping stock;
- shaping said shaping stock into a rough valve profile including a substantially mushroomshaped portion;
- subsequently forming a hole axially through a central portion of said rough valve profile by cutting;
- and
- sealingly plugging an open end of said hole close to the valve mushroom portion.
2 more elements
Dependencies are inferred from the claim text.