US2002069939A1PendingUtilityA1

Method of manufacturing an HLA for an internal combustion engine

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Priority: Dec 13, 2000Filed: Sep 28, 2001Published: Jun 13, 2002
Est. expiryDec 13, 2020(expired)· nominal 20-yr term from priority
Inventors:Seung Gyun Ahn
C23C 8/02C23C 8/22C23C 8/80F01L 1/14
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Claims

Abstract

The present invention is related to a method of manufacturing HLA for an internal combustion engine, wherein the friction of valve drain system can be reduced approximately 30% due to the polishing effect as well as the initial engine tune-up resulted from an etching treatment additionally applied on the upper surface of the HLA already treated with high carbon carburization.

Claims

exact text as granted — not AI-modified
what is claimed is:  
     
         1 . A method of manufacturing an HLA of an internal combustion engine characterized by comprising: 
 (a) a drawing process to generate a given material such as MAC  14  to have an appropriate diameter;    (b) a cold honing process;    (c) a high carbon carburizing process to improve wear resistance;    (d) a finishing process to finish up the carburized surface;    (e) and an etching process using NITAL for a predetermined period of time.    
     
     
         2 . In  claim 1 , said finishing surface is treated with NITAL for 50 sec.

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