确定了锥形模膛的最小长度、模腔锥角与毛坯长度的关系；
The minimum depth of conical die and the relationship between coning of die cavity and workpiece length are determined;
采用大变形刚塑性有限元法模拟超塑性材料轴对称锥形模约束胀形过程。
The constrained superplastic bulging process is investigated by a large rigid-plastic finite element method.
基于滑移线场的简化流动模型，运用数学方法求解出了一种锥形模正挤压变形力的最佳上限解，并将该上限解用通用解析式表达出来。
The deforming force of cone-die direct extrusion is solved by a mathematic method based on the simplified flow model of slip line field.
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