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Abstract：
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The calculating formula of upsetting forming pressure considering longitudinal forming velocity and transverse acceleration has been conducted by using main stress method in this paper.The calculating method,the relation between the forming pressure and time,and the affection of longitudinal forming velocity and transverse acceleration to the forming pressure are discussed through an example.Main stress method is suitable when a/h is not too small.Therefore,the formula obtained in this paper should be also a meet for this condition.The forming pressure is divided into three items: q_j,q_y,q_d.q_d is neglectful when ρV~2/k is far smaller than 1;q_d is not neglectful when ρV~2/k is close to 1.The position of maxium and minimum distribution pressure is the same as that of common upsetting of velocity-independent plastic material.The maximum pressure is at where x=0 and the minimum pressure is at where x=±a/2.
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Funds：
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淮海工学院学科建设基金资助项目(XK2003-02);;
淮海工学院自然科学基金资助项目(Z2002006);;
固体力学教育部重点实验室(同济大学)开放课题(200003)
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AuthorIntro：
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Reference：
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