Integration of Hot Tube Gas Forming and Die Quenching of Ultra-High Strength Steel Hollow Parts Using Low Pressure Sealed-Air |
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| Authors: | Ali Talebi-Anaraki Tomoyoshi Maeno Yuta Matsubara Ryohei Ikeda Ken-ichiro Mori |
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| Institution: | 1.Department of Mechanical Engineering, Materials Science, and Ocean Engineering, Graduate School of Engineering Science, Yokohama National University, Yokohama 240-8501, Kanagawa, Japan; (Y.M.); (R.I.);2.Division of Systems Research, Faculty of Engineering, Yokohama National University, Yokohama 240-8501, Kanagawa, Japan;3.Department of Mechanical Engineering, Toyohashi University of Technology, Toyohashi 441-8580, Aichi, Japan; |
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| Abstract: | A low pressure sealed-air hot tube gas forming process of ultra-high strength steel tubes was developed not only to change the cross-section of the hollow products by bulging but also to increase the strength of components. Gas-formed components are typically formed by a controlled-gas pressure with extremely high internal pressure, which leads to affected production costs and safety. Moreover, compressing the gas with high pressure requires high energy during its preparation. Therefore, to simplify the internal pressure controlling system and improve the safety factor in gas forming processes, the sealed-air tubes are formed with a quite low initial pressure. The pressure of the sealed air increased with increasing temperature of the air inside the resistance-heated tube, and the bulging deformation was controlled only by axial feeding. The effects of the initial pressure and heating temperature on the bulging deformation and quenchability of the tubes, and the effect of the starting time of axial feeding on the bulging behavior were examined. Consequently, ultra-high strength steel bulged parts were produced even in low initial internal pressure and with the rapid heating of the tubes. |
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| Keywords: | tube forming hot forming gas forming bulging low pressure die quenching |
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