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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2011, Vol. 32 ›› Issue (5): 953-960.doi: CNKI:11-1929/V_20101028.1834.004

• Material Engineering and Mechanical Manufacturing • Previous Articles    

Spring-back Prediction of Non-planar Tube Bending

ZHANG Shen, WU Jianjun   

  1. The Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, Ministry of Education, Northwestern Polytechnical University, Xi’an 710072, China
  • Received:2010-07-09 Revised:2010-08-19 Online:2011-05-25 Published:2011-05-19

Abstract: The spring-back phenomenon of tube bending occurs consequentially after unloading, which reduces the accuracy of tube manufacturing and processing efficiency. Therefore, it becomes the focus of study in tube bending. In this paper, the spring-back of a non-planar bended tube is projected onto two mutually perpendicular planes. The mathematical relationship of the radii of the bended plane before and after the spring-back is built through a pure bending spring-back experiment, and then the spring-back on the special planes are transformed into 3D, partitioned non-planar tubes after the spring-back are merged in the space in accordance with a special law. Thus, the re-construction of the non-planar tube shape which takes into consideration the spring-back is determined based on the above process. This spring-back prediction method can be useful for the maintenance of the bending die. It will ensure that the new shape meets the requirements of geometric accuracy of the non-planar bended tube.

Key words: tube-bending, non-planar bended tube, spring-back, bending die, prediction

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