Abstract: In one-step inverse analysis, the resistance produced by the blank holder or draw bead should be given by experience and then equivalent to the nodal force on the boundary line for obtaining a rational blank shape if the final configuration only contains the part surface. However, the resistance is not distributed uniformly. Handling as uniform distribution will cause big error. Giving manually section by section is inefficient. Here, a self-adaptive algorithm of the equivalent resistance is introduced. In the algorithm, firstly the initial configuration is obtained by linear elastic reverse deformation without considering any resistance. Then the resistance is assumed to be in direct proportion to the distance between the above mentioned initial configuration and the part contour line. In this way, the equivalent resistance can be distributed adaptively. To confirm the algorithm’s validity, two typical stamping parts are presented as examples. By comparing four different results respectively obtained by non-uniformly distributed resistance algorithm, uniformly distributed resistance algorithm, giving resistance manually section by section, a commercial software Fastform and trial and error, this self-adaptive algorithm is proved accurate and convenient.

Key words: equivalent resistance, one-step inverse analysis, self-adaptive algorithm