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The key intermediate blank shapes andinitial blank shape can be generated with the method in asequence opposite to the process sequence with many times.The optimum blank shape can also be designed according tothe formability of the stamping part.AcknowledgementWe thank Mr. Francis Liu of the UGS Company (USA) for thehelp of offering the numerical model (referenced as “Example1”).This project is supported byNationalNatural Science Foun-dation of China (No. 50575080) and National Science andTechnology support plan (No. 2006BAF01A43).referencesBatoz, J.L., Bathe, K.J., Ho, L.W., 1980. A study of three-nodetriangular plate bending elements. Int. J. Num. Method Eng.15, 1771–1812.Batoz, J.L., Hammadi, F., Zheng, C.L., et al., 2000. On the linearanalysis of plates and shells using a new sixteen dof flat shellelement. J. Comput. Struct. 78, 11–20.Guo, Y.Q., Batoz, J.L., Detraux, J.M., Duroux, P., 1990. Finiteelement procedures for strain estimations of sheet metalforming parts. Int. J. Num. Method Eng. 30, 1385–1401.Guo, Y.Q., Batoz, J.L., Naceur, H., et al., 2000. Recent developmenton the analysis and optimum design of sheet metal formingparts using a simplified inverse approach. Comput. Struct. 78,133–148.Guo, Y.Q., Gati, W., Naceur, H., Batoz, J.L., 2001. Springbackevaluation after forming simulation using the inverseapproach and incremental approach, simulation of materialsprocessing: theory, methods and applications. SwetsZeitlinger, 717–722.Jian, L., Xianghuai, D., Zhigang, L., 2002. FE inverse approach andevaluation for design of sheet metal forming progress. ChinaMech. Eng. 13, 826–829.Lee, C.H., Huh, H., 1998. Three dimensional multi-step inverseanalysis for the optimum blank design in sheet metal formingprocesses. J. Mater. Proc. Tech. 80/81, 76–82.Naceur, H., Guo, Y.Q., Batoz, J.L., Knopf-Lenoir, C., 2001.Optimization of drawbead restraining forces and drawbeaddesign in sheet metal forming process. Int. J. Mech. Sci. 43,2407–2434.Shuobeng, L., Guangqi, T., Bing, G., 2002. Stamping Manuals,second ed. China Machine Press.Yingping, G., Jun, Z., 2002. Research on place of stress and strainneutral layer in elastic plastic of plate. J. Plast. Eng. 9, 39–41.Yuqi, L., Junhua, L., 2006. Numerical constraint disposal forboundary friction in sheet metal forming. J. Mater. Proc. Tech.176, 4–7.Yuqi, L., Zhigang, L., Yakun, Y., 2004. Fast accurate prediction ofblank shape in sheet metal stamping forming. ActaMechanica Solida Sin. 17, 36–42.
摘要：一步展开法（MSUM）是毛坯的开发设计和复杂的级进模冲压件成形性预测的一种方法，就这种方法而言，是有限元模型的逆方法（在一个局部区域的逆方法），根据冲压工艺来讲，是在局部区域的基准面上展开中间形状。不仅是连接、压边力和摩擦的影响，而且影响不同曲率半径的应变中性层在局部区域的偏移，把这种方法放在模型中考虑，它提高了毛坯形状的计算精度在每一步。关键在于的中间坯的形状和初始毛坯形状可以遗传逆序列中的多次使用方法。最佳坯料形状也可根据成形件成形性设计。MSUM是对一个级进式冲模零件的毛坯设计，并进行了比较与实验和其他数值结果。
1简介
大量的汽车车身零件的变形通过冲压来实现的，有时具有冲压的特点零件非常复杂。为了提高产品的质量和的效率，许多零部件都是使用级进模制造。与简单的制造方式比较，级进模具有高质量、高效率的产品优势，特别适合于大批量在短时间内生产。然而，级进模的设计是非常困难的，级进模设计的排样图，只有丰富的经验和技术工程师且有较强的能力才做得好。在排样图设计中，首先，冲压工艺的设计是根据部分工艺的特点与经验以及简单的理论公式来进行的。其次，料带每一步是设计的过程和序列是将所有形状组装成带状。完成模具料带设计是非常重要的，在实际生产条件下的料带布局可以找出模具结构设计潜在的缺陷。这个过程是必要的，修改料状布局可以改善模具结构，直到缺陷改善。因此，获得一个最佳的料带布局是一个相当困难的任务。如果最佳坯料形状和尺寸的每一步成形性预测的设计阶段做的周全，这将大大减少设计和调整级进模是犯下的错误和时间。