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对 Ｊ Ｌ２１ 系列 １０００ｋ Ｎ 和 ６３０ｋ Ｎ 开式压力机机身强度和刚度进行了有限元计算与分析，并进行了机身结构优选，取得了既减轻机身重量又提高强度和刚度的显著效果。这对于降低成本并提高该系列产品的技术性能，具有重要意义。
The strength and stiffness of the fuselage of J L21 series 1000k N and 630k N open press were calculated and analyzed by finite element method. The structure of the fuselage was optimized and the significant effect of reducing the weight of the fuselage and increasing the strength and rigidity was obtained. This is of great importance to reducing costs and improving the technical performance of the series.