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Abstract：
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Finish -formingprocessofenginevalveforgingissimulatedandstudiedbyFEsoftwareMAPHA .Analysis showsthatthequalityoffinialforgingandtheservice -lifeoffinish -forgingdieareinfluencedgreatlybypre -forming blank’sgeometryparameters ,especiallytheratioofheaddiametertoitsheight (D/H)andtheneckradius (R) .Larger upsettingdeformationwouldbecausediftheratioofD/Hissmaller ,andextrusiondeformationwouldbecomeseriousifthe ratioofD/Hlarger .IfRislittletoomuch ,itwouldeasilyleadtothedefectofnotentirelydiefilling ,andWhenthefillet Ristoolarge,intensefrictionalshearingstressandnormalstresswouldleadthedieeasytocollapse .Theresultsprovide somereasonableprinciplesfortheshapecontrolofthepre-formingblankaswellasthestructuredesignofthefinish -forg ingdie .
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Funds：
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广东省自然科学基金资助项目 (990 1 4 1 ) ;;
广东工业大学资助项目 (992 0 2 0 )
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AuthorIntro：
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Reference：
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1 李尚健金属塑性成形过程模拟北京:机械工业出版社,1999
2 孙长杰等用有限元方法设计BJ型等速万向节外套预成形件机械工程学报,2000(1)
3 胡云贵等弹托温挤流变成形的数值模拟锻压技术,2000,25(1)
4 杨青春等汽车转向节成形过程的有限元数值模拟塑性工程学报,1996(3)
5 周大隽.锻压技术数据手册.北京:机械工业出版社,1998
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