而厚壁封头冲压成形过程属于几何非线性和材料非线性的问题，很难用弹塑性力学理论的解析法进行研究。
The drawing process of thick wall is a problem of geometry non-linear and material non-linear, so it is very difficult to be solved by the method of elasticity and plastics mechanics.
在石油化工设备压力容器制造中，对于整体冲压成形封头的质量控制关键是封头展开下料毛坯直径展开计算和冲压成形环节。
In the fabrication of pressure vessels for petrochemical equipments, the key to quality control of stamping of head is the calculation of head blank expanding size and the stamping of the head.
通过分析比较以往封头压模的设计参数与现有封头模具的差异，提出新的冲压件的压制工艺和模具设计方案。
The new punching technology and die design method is put forward by analyzing the deference of the former punching die design parameter and existing die.
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