A method of manufacturing titanium based automotive engine valves using a powder metallurgy process

摘要

There is provided an automotive engine valve stem, an engine valve, and a method of manufacturing the two. The valve includes a head and a stem joined to the head. Lightweight high temperature materials such as e.g. Titanium based materials can be used to form at least a majority of the valve. These materials are combined with manufacturing techniques that can vary between the head and the stem, with at least a portion of the valve being made by dynamic magnetic compaction. While much of the stem may be made of a titanium-based powder material, its tip may be made of a high strength, hardened material, such as e.g. consist of a steel alloy. The valve head can be manufactured by single pressing and sintering, double pressing and sintering, forging and machining, forging and sintering and dynamic magnetic compacting and sintering.