利用上限原理和最小能量原理，获得了用楔横轧工艺成形阶梯轴类件时杆部拉断的条件。
With upper bound method and least energy principle, the conditions are established of drawing and breaking workpiece with cross wedge rolling technique to form axial symmetry spare parts.
针对压盖具有的阶梯型结构，进行了拉深、成形工艺分析及计算。
Drawing and forming process analysis and calculation was carried out in terms of step configuration of the press-cover part.
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