Improved uniformity in cylindrical cup wall thickness at elevated temperatures using deep drawing process for SPCC sheet steel

This study aimed to investigate the effect of elevated temperatures, combined with the blank holder force and punch radius, on the thickness distribution of cylindrical cups in the deep drawing of SPCC sheet steel. Numerical simulations and corresponding experiments were conducted to evaluate the performance of the hardening equation that combines anisotropy coefficient based on Hill's 48 stress models in simulating and comparing the deformed cylindrical cup shapes at room and elevated temperatures. The results showed good agreement between simulation and experimental data and confirmed that the thinness of the cylindrical cup increased at elevated temperatures due to the indeterminacy of the blank holder force parameter. To improve the thickness uniformity of the cylindrical cups, the Taguchi analysis design and ANOVA variance were employed to optimize the blank holder force, punch radius, and elevated temperature parameters. The optimal parameters were selected for simulation and experiment to confirm the uniformity of the cup thickness, with a thickness deviation of only 1.62% between simulation and experiment. This study provides valuable insights into the process parameters and conditions necessary for the deep drawing of cylindrical cups with uniform thickness distribution.

Automated summary

This study investigated the impact of elevated temperatures, blank holder force, and punch radius on the thickness distribution of cylindrical cups in the deep drawing of SPCC sheet steel. Numerical simulations and experiments were conducted to evaluate the performance of the hardening equation in simulating the deformed shapes of cylindrical cups. The results showed that the thinness of the cups increased at elevated temperatures and the optimal parameters were determined to achieve uniform thickness distribution.