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本文根据约翰逊公式及力学等效性原理建立了多台阶中长受压凸模的强度及稳定性校核条件，确定了许用冲裁力及许用自由长度等参数的设计方法。文末介绍了设计实例。
Based on the Johnson formula and mechanics equivalence principle, this paper established the condition of checking the strength and stability of multi-step middle and long pressed punch, and determined the design method of parameters such as allowable blanking force and allowable free length. The end of the article introduced the design examples.