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Abstract：
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Based on the result of visioplasticity test,the law of tube central upsetting was created,and the calculated method of displacement field and strain field were obtained.In this study,the four deformation modes were showed when ratio λ of height to thickness of tubular billet is greater than 3.The four modes were related to the distribution of strainless plane.
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AuthorIntro：
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Reference：
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1 张志文 .锻造工艺学 .北京 :机械工业出版社 ,1 998.
2 汪大年 .金属塑性成形理论 .北京 :机械工业出版社 ,1 986.
3 S Tadano,H Ishikawa. Non-Steady State Deformation of ThickCylinder during Upset Forging. Advanced Tech of Plasticity.1 990 ,1 :1 4 9～ 1 54
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