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Shape accuracy analysis of multi-point forming process for sheet metal under normal full constrained conditions

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Abstract

In order to study the shape accuracy of multi-point forming (MPF) process for sheet metal under normal full constrained conditions, the in-depth analysis of shape accuracy of workpieces in multi-point forming with individually controlled force-displacement (MPF-ICFD) process is conducted in this paper by combining experiment, theoretical analysis and numerical simulation. The influences of normal force, material thickness and material properties on the shape accuracy of the feature surface are studied, and the shape accuracy characteristics of the sheet under different parameters are obtained. Afterwards, the stress and strain characteristics of sheets are obtained by numerical simulation. Finally, the effect of normal force on shape accuracy was revealed by establishing a mechanical model of the sheet metal under normal full constrained conditions. Moreover, the amount of springback reduction in MPF-ICFD is defined quantitatively. Compared with the normal unconstrained conditions, the shape accuracy of sheet metal is improved significantly under normal full constrained conditions. The stress and plastic deformation are more uniform and the amount of springback is smaller. For Q 295 steel plate with thickness of 2.0 mm, the difference between the maximum value and the minimum value of the reaction force of punch decreases from 4515.9 N to 1475 N when the forming force is 2500 N. Besides, the bending moment of the sheet on the unit width decreases from 357.9 N • mm to 328.1 N • mm. The average shape error E rr and the amount of springback Δk decreases by 60.05% and 16.03%, respectively.

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (No. 51505103, No. 51175109). The authors wish to express their gratitude to the funding.

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Authors and Affiliations

  1. School of materials science and engineering, Harbin Institute of Technology, Harbin, 150001, China

    Bin-bin Jia

  2. School of materials science and engineering, Harbin Institute of Technology at Weihai, Weihai, 264209, China

    Bin-bin Jia & Wei-Wei Wang

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  1. Bin-bin Jia
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  2. Wei-Wei Wang
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Correspondence to Bin-bin Jia.

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Funding

This study was funded by the National Natural Science Foundation of China (No. 51505103, No.51175109).

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The authors declare that they have no conflict of interest exits in the submission of this manuscript, and manuscript is approved by all authors for publication.

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Jia, Bb., Wang, WW. Shape accuracy analysis of multi-point forming process for sheet metal under normal full constrained conditions. Int J Mater Form 11, 491–501 (2018). https://doi.org/10.1007/s12289-017-1359-2

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