Minimizing wrinkling formation of GPa-grade steels in multi-stage crash forming process
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This paper newly proposes a strategy for constructing the multi-stage forming procedures to minimize the wrinkling formation with GPa-grade steels in the crash forming. Although the optimum design variables were adopted in the conventional crash forming, it is not possible to control the wrinkling formation in severe cases. In the multi-stage crash forming, the safe forming window against the wrinkling formation for the pre-stage forming has been constructed with numerical simulations representing the effects of design variables such as die radius, die angle, step height variations, and flange lengths. It does not only substantially reduce the area fraction of the wrinkling formation, but also recommend the other optimum design variables by interpreting the safe forming window. Experimental validations were carried out by applying the design variables suggested by the safe forming window for the multi-stage forming, which is compared with the conventional crash forming with TRIP1180 steel sheet.
KeywordsCrash forming GPa-grade steels Wrinkling Wrinkling criterion Multi-stage crash forming
Author Prof. Jonghun Yoon has received research funding from the Materials Forming Research Group, POSCO, and “Human Resources Program in Energy Technology” of the Korean Institute of Energy Technology Evaluation and Planning (KETEP), granted by the Ministry of Trade, Industry & Energy, Republic of Korea (no. 20174010201310).
The authors declare that they have no conflicts of interest.
- 4.Chen XM, Shi MF, Chen G, Kamura M, Watanabe K, Omiya Y (2005) Crash performances of advanced high strength steels of DP780, TRIP780 and DP980. SAE Technical Paper 2005-01-0354. https://doi.org/10.4271/2005-01-0354.
- 12.Yoshida T, Katayama T, Hashimoto K, Kuriyama Y (2003) Shape control techniques for high strength steel in sheet metal forming. Nippon Steel Technical Report 88:27–32Google Scholar
- 13.Yoshida T, Isogai E, Sato K, Hashimoto K (2013) Springback problems in forming of high-strength steel sheets and counter measures. Nippon Steel Technical Report 103:4–10Google Scholar
- 14.Bobade SS, Badgujar TY (2017) Design analysis of a cross member panel for eliminating a wrinkling. Int J Eng Res Tech 6:358–361Google Scholar
- 16.Connie Yao Z (2011) Die wear evaluation for stamping TRIP700 and DP980 B-Pillar, SAE Int. 2011-01-0038. https://doi.org/10.4271/2011-01-0038
- 19.Shimid K (2011) Evaluation of DP780 and DP980 for B-Pillars, Autosteel Seminar. https://www.autosteel.org/-/media/files/autosteel/great-designs-in-steel/gdis-2008/22%2D%2D-evaluation-of-dp780-and-dp980-for-b-pillars.ashx. Accessed 2 Feb 2019
- 24.AutoForm R7.0.2 Software Manual, AutoForm Engineering GmbH, February 28, 2017.Google Scholar
- 25.Dr. -ing, Dr. h.c., Mathias Liewald MBA (2016) Use of forming simulation in modelling and process development of sheet metal forming processes, 14th German LS-DYNA Forum, Bamberg, Germany. October 10–12Google Scholar
- 27.Taguchi G, Konishi S (1987) Taguchi Methods, Orthogonal Arrays and Linear Graphs, Tools for Quality Engineering, American Supplier Institute, Inc. Center for Taguchi Methods, ASI Press, Allen Park, Michigan, p. 36Google Scholar
- 28.Nawaz Y, Maqsood S, Naeem K (2018) Effect of input parameters of wire electric discharge machining on surface integrity of DC53 die steel. In 2018 International Conference on Power Generation Systems and Renewable Energy Technologies (PGSRET) IEEE:1-6, https://doi.org/10.1109/PGSRET.2018.8685955