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摘要：
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根据管坯视塑性实验法的实验结果 ,分析了无芯轴支撑条件下 ,管坯中部镦锻的变形规律 ,阐述了变形区位移场、应变场的计算方法 ;通过对实验结果的分析 ,得出了当镦粗比 λ>3 ,管坯中部镦锻时 ,内壁呈现四种典型的变形模式 ;论述了分流面的分布与四种变形模式之间的转化关系。
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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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基金项目：
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作者简介：
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参考文献：
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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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