Development of a symmetrical four-roller bending process

  • Gaochao YuEmail author
  • Jun Zhao
  • Changfu Xu


In order to reduce the straight edge section and simplify process flow, a new symmetrical four-roller bending process is proposed, and its optimum forming process is determined. The main procedure composes of feeding, pre-bending, reverse roll bending, final bending, positive roll bending, unloading, and springback. It has advantages of less production procedure, small remaining straight edge, and simple equipment structure. Three methods are adopted to study the process, i.e., theoretical analysis, numerical simulation, and physical experiment. According to the theory of elastoplastic and geometric relation, the relationship between the reduction of the upper roller and the curvature radius before and after springback is established, and the reduction of the upper roller can be predicted. The symmetrical four-roller bending process is simulated by ABAQUS software. The distribution of stress and strain is analyzed, and the theoretical curvature radius and the simulated curvature radius are compared. The rolling part is obtained from simulation with an ovality of 0.43% and only 1.5 times the thickness of the remaining straight edge. The symmetrical four-roller bending machine is designed, and the ovality of the rolling part from experiment is less than 5%, and the minimum is only 1.74%. The error of most curvature radius is less than 0.5%. Numerical simulation and physical experiments both prove the feasibility of the method. The effect of the process parameters on the curvature after springback is studied by a single variable method. This process provides a new idea for pipe production and helps improve the rolling quality.


Thin-walled pipe Four-roller bending Four-point bending Springback Numerical simulation Process parameters 


Funding information

This project was funded and supported by the Project funded by China Postdoctoral Science Foundation (2018M641672), Science and Technology Project of Qinhuangdao (201805A007), National Natural Science Foundation of China (51575473), and Doctoral Foundation of Yanshan University (BL18024).


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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  1. 1.Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University), Ministry of Education of ChinaQinhuangdaoPeople’s Republic of China
  2. 2.College of Mechanical EngineeringYanshan UniversityQinhuangdaoPeople’s Republic of China

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