Advances in Manufacturing ›› 2024, Vol. 12 ›› Issue (2): 396-408.doi: 10.1007/s40436-023-00462-0

• • 上一篇    

Evolution of inner wall wrinkle defects in the sinking zone of a thick-walled steel tube during radial forging

Yu-Zhao Yang, Cheng Xu, Li-Xia Fan   

  1. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
  • 收稿日期:2022-12-08 修回日期:2023-01-28 发布日期:2024-05-16
  • 通讯作者: Yu-Zhao Yang,E-mail:yangyuzhao@njust.edu.cn E-mail:yangyuzhao@njust.edu.cn
  • 作者简介:Yu-Zhao Yang received his Ph.D. degree in Mechanical Engineering from Nanjing University of Science and Technology, Nanjing, China, in 2021. He is currently a postdoctor of Mechanical Engineering in Nanjing University of Science and Technology, China. His current research interests include metal plastic forming and defect research;
    Cheng Xu received his Ph.D. degree in Mechanical Engineering from Nanjing University of Aeronautics and Astronautics, Nanjing, China, in 1991. He is currently a professor of Mechanical Engineering in Nanjing University of Science and Technology, China. His current research interests include fluid mechanics, advanced manufacturing and machine design;
    Li-Xia Fan received her Ph.D. degree in Mechanical Engineering from Nanjing University of Science and Technology, Nanjing, China, in 1991. She is currently a professor of Mechanical Engineering in Nanjing University of Science and Technology, China. Her current research interests include metal plastic forming, advanced manufacturing, modeling and simulation.
  • 基金资助:
    Acknowledgement This work was supported by the National Natural Science Foundation of China(Grant No.52105366) and the Jiangsu Postdoctoral Research Funding Program(Grant No.2021K040A).

Evolution of inner wall wrinkle defects in the sinking zone of a thick-walled steel tube during radial forging

Yu-Zhao Yang, Cheng Xu, Li-Xia Fan   

  1. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
  • Received:2022-12-08 Revised:2023-01-28 Published:2024-05-16
  • Contact: Yu-Zhao Yang,E-mail:yangyuzhao@njust.edu.cn E-mail:yangyuzhao@njust.edu.cn
  • Supported by:
    Acknowledgement This work was supported by the National Natural Science Foundation of China(Grant No.52105366) and the Jiangsu Postdoctoral Research Funding Program(Grant No.2021K040A).

摘要: An axial wrinkle defect was observed in the inner wall of the sinking zone of a thick-wall steel tube processed by cold radial forging. Wrinkles can evolve into fissures. The present study focuses on the evolution of wrinkles and the effects of process parameters on them using a three-dimensional radial forging process finite element model, radial forging experiments, and surface morphology observations. The results indicated that the vertical section angle of the hammer die and the size of the tube blank significantly affect the evolution of wrinkles. The height-towidth ratio λ was introduced to describe the morphology of wrinkles. It had an approximately linear relationship with the radius reduction in the sinking zone. There was a linear correlation between the growth slope of λ and the axial to circumferential strain ratio|εr/εθ|, which can predict the λ under few process parameters. For the 30SiMn2MoVA steel, at the junction of the forging and sinking zones, the threshold of λ of the wrinkle that can evolve into a fissure is approximately 1.123.

The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-023-00462-0

关键词: Radial forging, Inner wall, Wrinkle defects, Evolution, Sinking zone

Abstract: An axial wrinkle defect was observed in the inner wall of the sinking zone of a thick-wall steel tube processed by cold radial forging. Wrinkles can evolve into fissures. The present study focuses on the evolution of wrinkles and the effects of process parameters on them using a three-dimensional radial forging process finite element model, radial forging experiments, and surface morphology observations. The results indicated that the vertical section angle of the hammer die and the size of the tube blank significantly affect the evolution of wrinkles. The height-towidth ratio λ was introduced to describe the morphology of wrinkles. It had an approximately linear relationship with the radius reduction in the sinking zone. There was a linear correlation between the growth slope of λ and the axial to circumferential strain ratio|εr/εθ|, which can predict the λ under few process parameters. For the 30SiMn2MoVA steel, at the junction of the forging and sinking zones, the threshold of λ of the wrinkle that can evolve into a fissure is approximately 1.123.

The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-023-00462-0

Key words: Radial forging, Inner wall, Wrinkle defects, Evolution, Sinking zone