This study investigates the spring-back characteristics in the sheet metal U-bending process using finite element analysis. The elastic recovery phenomenon, known as spring-back, poses significant challenges in ensuring dimensional accuracy in sheet metal forming. The study employs an updated Lagrangian thermo-elastoplastic finite element method to analyze the effects of various process parameters on spring-back. Key findings demonstrate that the punch corner radius, punchdie clearance, and friction coefficient are major influencers, while the punch velocity and sheet thickness have minimal impact. This research provides insights for tool designers to enhance prediction accuracy and suppress elastic recovery.