针对传统的毛坯展开方法所存在的问题 ,本文采用形变理论并利用理想形变的假设 ,导出用于板料成形设计的逆算法。理想形变假设认为变形是在整体塑性功取得相对极值的条件下得到的 ,文中给出了理想形变的数学公式和有限元表达。将此数值方法的结果与实验数据对照 ,得到了满意的结果 Aiming at the problems existing in traditional blank unrolling method, this dissertation deduces the inverse algorithm used in sheet metal forming design by using the theory of deformation and the assumption of ideal deformation. The ideal deformation assumption assumes that the deformation is obtained under the condition that the overall plastic work obtains the relative extreme value. The ideal deformation mathematical formula and the finite element expression are given in this paper. The results of this numerical method are compared with the experimental data and satisfactory results are obtained