This paper investigates the equivalent model for the friction boundary conditionbetween blank and holder during sheet metal forming simulation, and proposes an equivalentalgorithm, the thickness threshold value algorithm, for the first time based on thickness weighting.This algorithm assumes that the holder clearance is uniform during sheet metal forming; and themain reason for the unevenness of friction force distribution under the holder is that the unevendeformation of the blank leads to its uneven thickness distribution, which makes the local pressureon the blank distributed unevenly. The algorithm proposed in this paper can effectively simulatethe influence of the unevenness on the forming process. Validity of this algorithm is verified bya comparison between the simulation results and the experimental ones for the drawing processof a car spring base.
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