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An Equivalent Calculation Method for Press-Braking Bending Analysis of Integral Panels

School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
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Author to whom correspondence should be addressed.
Metals 2018, 8(5), 364; https://doi.org/10.3390/met8050364
Received: 17 April 2018 / Revised: 6 May 2018 / Accepted: 15 May 2018 / Published: 18 May 2018
(This article belongs to the Special Issue Modern Aerospace Materials)
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Abstract

Press-braking bending is widely applied in the manufacture of aircraft integral panels because of the advantages of strong adaptability to different contours, simplicity of bending tools, short manufacturing time and low process cost. However, a simulation of bending process requires long-time calculation and consumes extensive computational resources. Considering the factors that the original model (ORM) of an integral panel is large and the press-braking bending is used only for the local area of integral panels with heavy thickness in practice, an equivalent calculation method for press-braking bending analysis of integral panels is proposed. The local bending area of an integral panel is simplified to a model of plate in this method. An exponential strengthening model is used to derive the equations of stress, strain and forming radius of the ORM and its simplified model (SPM). Meanwhile, the equivalent parameters of the SPM are determined and deduced based on three principles: that the material begin to be yielded simultaneously, the ultimate stress of the ORM is the same as that of the SPM at the same punch displacement, and the forming radii of neutral surfaces of the ORM and the SPM are identical after springback. The distribution of the stress and strain determined by finite element (FE) simulations are compared, and the FE simulations indicate that the contour curve of the SPM is in fairly good agreement with the profile of the ORM under the same bending process parameters, and the maximum difference is 13.17%. The computational efficiency is increased by more than 48%. Therefore, the proposed approach is quite suitable for industrial applications to improve the bending quality and efficiency of integral panels. View Full-Text
Keywords: equivalent model; press-braking bending; equivalent parameters; finite element (FE) method; integral panels equivalent model; press-braking bending; equivalent parameters; finite element (FE) method; integral panels
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Zhang, M.; Tian, X.; Li, W.; Shi, X. An Equivalent Calculation Method for Press-Braking Bending Analysis of Integral Panels. Metals 2018, 8, 364.

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