Transactions of Materials and Heat Treatment

Title：Optimization research on free bending loading curve for pipe based on cantilever beam analysis

Authors： Xu Xinliang1 2 Wu Wei1 2 Yan Jing1 2 Zhang Zhe3 Han Xiuquan1 2

Unit： 1.AVIC Manufacturing Technology Institute 2.Aviation Key Laboratory of Science and Technology on Plastic Forming 3.Institute of Standard Process Material Design AVIC First Aircraft Design Research Institute

KeyWords： free bending loading curve cantilever beam bending die bent conduit

ClassificationCode：TG386

year,vol(issue):pagenumber：2023,48(12):138-142

Abstract：

Free bending technology can realize the forming of conduits with complex axis by simultaneously controlling the axial propulsion of pipe and the movement of bending die. Therefore, through the analysis of free bending process and the theory of elastic-plastic deformation, combined with the assumption of cantilever beam shape in the forming area, the control equation of the forming area in the free bending process of pipe was discussed, and the function relationship between the bending process parameters (displacement and rotation angle) based on the assumption of cantilever beam shape in the forming area and the specific curvature radius of forming was derived. Furthermore, the free bending process of superalloy GH4169 conduits was numerically simulated by finite element software, and the shapes of the conduits formed based on the arc analytical and cantilever beam analytical loading curves were compared. It is shown that the formed is closer to the design size based on the cantilever beam analytical loading curves. Finally, it is determined that the bending die rotation angle is the reason for the difference in the above two loading curvatures, and the rotation angle in the cantilever beam analytical loading curve is coordinated with the shape of the current bent conduit and the displacement of the bending die.

Funds：

徐鑫良（1985-），男，硕士，高级工程师 E-mail：xuxinl@qq.com

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