Springback of thin-walled tube NC precision bending and its numerical simulation
(1.College of Materials Science and Engineering, Northwest Polytechnic University, Xi’an 710072, China2.西北工业大学 凝固技术国家重点实验室，西安 710072)
Abstract: The springback is one of the key factors which affect the forming quality of thin-walled tube NC precision bending. The elastic-plastic finite element method was proposed to study the springback process of thin-walled tube NC precision bending and the combination of dynamic explicit algorithm and the static implicit algorithm was proposed to solve the whole process of thin-walled tube NC precision bending. Then, the 3D elastic-plastic finite element model was established based on the DYNAFORM platform, and the model was verified to be reasonable. At last, the springback rule of thin-walled tube NC precision bending and the effect of geometry and material parameters on the springback rule of thin-walled tube NC precision bending were studied, which is useful to controlling the springback of thin-walled tube NC precision bending, and the numerical simulation method can be used to study other effect of parameters on the forming quality of thin-walled tube NC precision bending.
Key words: thin-walled tube; NC bending; precision forming; springback; simulation