Hydroforming Process Design: An Integrated Review of Fundamentals, Process Parameters, Numerical Modeling, Intelligent Optimization, and Digital Manufacturing

Abstract

Hydroforming has become one of the most advanced metal forming technologies for manufacturing lightweight, high-strength, and geometrically complex components with superior dimensional accuracy and enhanced mechanical performance. Its growing industrial adoption is primarily attributed to the ability of pressurized fluid to improve material flow, increase formability, reduce manufacturing defects, and enable the production of complex geometries that are difficult to achieve using conventional forming techniques. This review presents a comprehensive and integrated analysis of hydroforming process design by examining the fundamental principles of sheet and tube hydroforming, the influence of key process parameters on forming performance, and recent advances in numerical modeling for process prediction and defect analysis. The review further discusses modern process monitoring technologies and summarizes conventional and intelligent optimization strategies, including statistical methods, finite element-based optimization, artificial intelligence, machine learning, and digital manufacturing technologies. Particular attention is given to the integration of computational simulation, data-driven methodologies, and smart manufacturing frameworks for improving process reliability, reducing development time, and enhancing product quality. The interactions among process variables and the importance of multi-parameter optimization are critically analyzed to provide a unified perspective on hydroforming process design. Finally, current technical challenges and future research directions are discussed, emphasizing the increasing role of Digital Twin technology, intelligent decision-making, and sustainable manufacturing in next-generation hydroforming systems. The review serves as a comprehensive reference for researchers and engineers seeking to design robust, efficient, and intelligent hydroforming processes while supporting future developments in advanced manufacturing.