Preparing method of engine valve
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorSung Hwan Park
Life of this patent
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Abstract
A method of preparing an engine valve is provided. The method includes hot forging a heat resistant steel at 1,150 to 1,250° C. to mold a valve, aging the molded valve and hollowed-out processing the aging valve. Additionally, the method includes nitride-heating the hollow valve and grinding a surface of a neck of the nitride-heated valve to remove a nitride layer.
Claims12
A method of preparing an engine valve, comprising:
- hot forging a heat resistant steel at 1,150 to 1,250° C. to mold a valve;
- aging the molded valve;
- hollowed-out processing the aging valve;
- nitride-heating the hollow valve;
- and
- grinding a surface of a neck of the nitride-heated valve to remove a nitride layer.
An engine valve made of heat-resistance steel and having a hollowness, comprising a nitride layer, wherein the nitride layer is formed on a surface of the valve excluding a neck of the valve.
Dependencies are inferred from the claim text.