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Abstract：
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An internal high pressure forming process of a car steering column has been researched and the part is produced through experiments successfully. The cross sections of the part are mainly hollow rectangular sections with big different dimensions at different positions of the part axis, so that it is necessary to be manufactured through preforming and final forming processes with a tube blank. During the preforming, a preform with an expansion ratio of 70% can be achieved by controlling the relationship between the internal pressure and the axial feeding force. Then, through bending, closing in the final dies and forming by a higher pressure, a final part meeting the thickness and dimensions demands is manufactured. Without a welding flange, the continuous cross section of the tubular part is beneficial to enhance the stiffness, strength and the fatigue strength of the part.
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Reference：
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1 苑世剑,郎利辉,王仲仁内高压成形技术研究与应用进展哈尔滨工业大学报,2000,32(5):60～63
2 FrankHortonHydroformingapplicationtrendsinautomotivestructuresPapersoftheInternationalConferenceonHydroforming,Fellbach,Ger many,Oct28th-29th,2003:7～14
3 JSporer,MDelker,AZisler,etcHydroformingatBMW PapersoftheInternationalConferenceonHydroforming,Fellbach,Germany,Oct28th-29th,2003:91～109
4 YuanSJ,LiuG ,LangLH Numericalsimulationofwrinklinginhydro formingofaluminumalloytubesTransactionsofNonferrousMetalsSocietyofChina,2003,13(S1):152～156
5 YuanSJ,LiuG ,WangXS ,WangZR Useofwrinklesintubehydro formingIdeaandexamplesHydroforming2003,Stuttgart,Germany,2003,10:79～90
6 YuanSJ,LiuG ,TianXW ,WangZR Hydroformingofrectangular sec tionstructuralcomponentswithrelativelylowerpressureProceedingsoftheTUBEHYDRO 2003,Aichi,Japan,2003,9:13～17
7 戴昆,何祝斌,王仲仁管材内压液力成形的稳定性分析塑性工程学报,2002,7(4):49～52
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