JCOE is a progressively advanced forming process that encompasses J-forming, C-forming, O-forming, and expansion technology. This methodology constitutes an efficacious means of producing high-strength pipes. In recent years, this process has been utilized in the manufacturing of small-diameter, thick-walled welded pipes using nickel-based alloy N08810 plates. This study establishes a mathematical model for key parameters in the pre-bending process, rooted in JCOE forming and plastic bending theory, and introduces a process optimization approach. Initially, by refining the mold configuration and executing simulation analyses, we comprehensively delineate the stress-strain distribution and metal flow dynamics during pre-bending. Furthermore, we unravel the influence of varying plate thicknesses on both the pre-bending force and springback bending angle. Ultimately, the veracity of our theoretical model and simulation protocol is substantiated through rigorous experimentation. The findings indicate that the optimized mold configuration yields superior pre-bending forces and springback bending angles compared to conventional methods, thereby furnishing a solid theoretical foundation for industrial applications.
