Abstract：The outer pressure forming method corresponding to the inner pressure forming of thin-walled tube parts is rarely applied to the forming of large deformation parts due to the influence of instability and wrinkling. Viscous outer pressure forming uses the physical characteristics and mechanical properties of the viscous media to not only provide the stability of the tube, but also adapt to changes in the shape of the wrinkling tube, and eliminate wrinkles under a certain pressure field, thereby effectively solve the outer pressure influence of instability and wrinkling during forming on the quality of outer pressure forming. This paper mainly introduces the basic principle of viscous outer pressure forming, summarizes the influence of medium properties, loading methods and tube size on the instability wrinkling process, as well as the application of viscous outer pressure forming in thin-walled tube parts, and summarizes and looks forward to the existing problems and development trends.
2022, 
