Abstract
Spring-back issues are critical in stamping procedures for advanced high strength steel. The spring-back can be comprehensively controlled by applying a newly designed hybrid bead to effectuate a post-stretching process in a U-channel part forming. Finite element forming simulation is applied in a cross-section to evaluate and optimize the hybrid bead performance, using DP980. A specific post-stretching die with the optimized hybrid bead was manufactured and applied to demonstrate the performances. Excellent spring-back control and material restricting effect were observed in the stamping results. Both effects of clamping force and post-stretching amount are systematically studied, using 1.2mm DP980 and CP1180 AHSS sheets. Significant tonnage reduction was achieved, comparing to the original stinger bead design. An analytical solution was also applied to predict the same process with good correlation.
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