Abstract
Hemming is the main assembly process used for auto-body panels. Surface defects resulting from the hemming operation may significantly influence the appearance aesthetics of an automobile. The formation of surface defects can be forestalled, and the process can be optimized and compensated by the numerical simulation method during the process design stage. In this study, the hemming assembly of a fuel tank cap is chosen as the research object, and the specimen is made of DX54D + Z deep drawing steel sheet. Numerical simulation and forming experiments have been carried out. It was found that the surface defect index can be expressed as the weighted sum of the design variable effects by simulation and orthogonal design. In addition, the magnitude of each effect can be ranked from the most significant to the least significant. Using this information helps to obtain an optimal hemming process plan. However, process parameter optimization cannot completely eliminate surface defects. The surface compensation of tool geometry based on the continuity of curvature was used to eliminate the surface lows and the hemming test results indicated that the obtained component was of the required quality.
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References
Liewald M, Hönle S, Sindel M (2016) Surface roughening of an aluminum 6016 alloy during bending and hemming. Int J Mater Form 9(2):203–213. https://doi.org/10.1007/s12289-015-1223-1
Maoût NL, Thuillier S, Manach PY (2010) Drawing, flanging and hemming of metallic thin sheets: a multi-step process. Mater Des 31(6):2725–2736. https://doi.org/10.1016/j.matdes.2010.01.030
Esquivel E, Carbone G, Ceccarelli M, Jáuregui J (2016) Requirements and constraints for a robotized roll hemming solution. RAAD 2016: Advances in robot design and intelligent control, pp 244-251. https://doi.org/10.1007/978-3-319-49058-8_27
Sun ZZ, Yang YY, Shi L (2008) Experimental study on controlling technique of surface deflection. J Mater Process Technol 199(1-3):445–447. https://doi.org/10.1016/j.jmatprotec.2007.07.019
Andersson A (2009) Evaluation and visualisation of surface defects on auto-body panels. J Mater Process Technol 209(2):821–837. https://doi.org/10.1016/j.jmatprotec.2008.02.078
Park CD, Chung WJ, Kim BM (2007) A numerical and experimental study of surface deflections in automobile exterior panels. J Mater Process Technol 187-188:99–102. https://doi.org/10.1016/j.jmatprotec.2006.11.129
Nordström M, Järvstråt N (2009) An appearance-based measure of surface defects. Int J Mater Form 2(2):83–91. https://doi.org/10.1007/s12289-009-0393-0
Yang YY, Zhao LH, Sun ZZ (2007) Study on mechanism of cylindrical shallow shell surface deflection. J Mater Process Technol 187-188:145–149. https://doi.org/10.1016/j.jmatprotec.2006.11.176
Le Port A, Thuillier S, Manach PY (2010) Occurrence and numerical prediction of surface defects during flanging of metallic sheets. Int J Mater Form 3(3):215–223. https://doi.org/10.1007/s12289-009-0677-4
Le Port A, Thuillier S, Manach PY (2011) Characterization of surface defects after flanging of metallic sheets. J Mater Process Technol 211(12):2062–2071. https://doi.org/10.1016/j.jmatprotec.2011.07.004
Shen HQ, Li SH, Chen GL (2012) Quantitative analysis of surface deflections in the automobile exterior panel based on a curvature-deviation method. J Mater Process Technol 212(7):1548–1556. https://doi.org/10.1016/j.jmatprotec.2012.03.005
Shen HQ, Li SH, Ni XF, Chen GL (2013) A modified displacement adjustment method to compensate for surface deflections in the automobile exterior panels. J Mater Process Technol 213(11):1943–1953. https://doi.org/10.1016/j.jmatprotec.2013.05.009
Weinschenk A, Volk W (2017) Strategy to prevent surface deflections for automotive sheet metal parts. J Phys Conf Ser 896:012058
Hu Y, Zhu X, Lee W (2008) Surface low prediction using ls-dyna and dynaform. In: Numisheet 2008, September. Interlaken, Switzerland, pp 1–5
Chung WJ, Kim WS, Kim JH, Seo JH, Jung TC (2011) Evaluation of surface deflection in automobile exterior panel by curvature based method. In: Numisheet 2011, AIP Conf. Proc 1383:1072–1077
Wang XZ (2011) Tool wear prediction using AutoForm software. In: tool wear prediction modeling for sheet metal stamping die in automotive manufacture. PhD thesis. Swinburne University of Technology, Melbourne, pp 52–70
Acknowledgements
The authors are grateful to FAW Tooling Die Manufacturing Co., Ltd. for their valuable help in the experimental part.
Funding
This study was funded by the Technology Development Program of Jilin Province (20160204058GX).
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Wang, G., Gu, Z., Xu, H. et al. Numerical analysis and experimental investigation of surface defects in die hemming process. Int J Mater Form 13, 91–102 (2020). https://doi.org/10.1007/s12289-019-01470-x
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DOI: https://doi.org/10.1007/s12289-019-01470-x