变薄拉深，通常是拉深工序或冷挤成形工序后进行的一种旨在实现极薄壁杯形件的成形工序。也可用此方法实现极薄壁管件的成形。
利用上限元法对变薄拉深过程进行了数值模拟。
This paper simulates the deformation process of ironing deep drawing by means of the upper bound element method.
利用连续速度场解析了筒形件变薄拉深过程拉深力，并获得其上限解析解。
A continuous velocity field is established and applied to the ironing process, and an upper-bound analytical solution is obtained.
本文用变形功法和滑移线法分别求解变薄拉深力，并将两种方法的计算结果进行了比较。
The thinning drawing force is calculated through deforming work method and slip-line method irrespectively, and the results are compared in this paper.
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