为了提高产品质量和降低生产成本 ,需要合理确定成形件的毛坯形状。在介绍目前几种确定合理毛坯形状方法的基础上 ,提出用形状误差来优化由几何映射法获得的初始毛坯 ,进而确定合理的毛坯形状。以方盒件为例进行了数值模拟和物理模拟 ,结果表明 ,该方法确定的毛坯成形时避免了成形缺陷 ,而且修边余量小 ,既提高了质量又降低了成本 ,因而此方法是一种确定毛坯的有效方法 In order to improve product quality and reduce production costs, the shape of the blank of the shaped part needs to be reasonably determined. Based on the introduction of several methods to determine the reasonable shape of the blank, the paper proposes to use the shape error to optimize the initial blank obtained by the geometric mapping method and then to determine the reasonable blank shape. The numerical simulation and physical simulation are carried out by taking square box as an example. The results show that this method can avoid the forming defect when the blank is formed, and the margin for trimming is small, which not only improves the quality but also reduces the cost. An effective way to determine the rough