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摘要：
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介绍了轻合金热介质内压成形基本原理,研究了温度对镁合金和铝合金管材热态内压成形性能的影响,进行了镁合金变截面件和铝合金变径管成形试验。所建立的热介质内高压成形装置最高加热温度315℃,压力100 MPa,可实现高压热介质的传输和密封、成形件温度和加载曲线控制等。对镁合金和铝合金管材在不同温度下成形性能的测试分析表明,轻合金热成形需综合考虑总延伸率、均匀延伸率和n值等参数随温度的变化,选取合适的成形温度。
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The principle of warm hydroforming was introduced.The formability of tube blanks of Mg-alloy and Al-alloy was tested.A Mg-alloy part with various cross sections and an Al-alloy tubular part with various diameters were manufactured.A warm hydroforming device with the highest medium temperature of 315 ℃ and the maximum pressure of 100 MPa was set up,which was capable of transmitting and sealing warm medium at high pressure,and controlling tube temperature and loading path.Testing and analysis on the formability of Mg-alloy and Al-alloy at various temperatures indicate that the effects of temperature on total elongation, uniform elongation and work-hardening-coefficient should be considered comprehensively to determine a proper forming temperature range.
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基金项目：
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国家杰出青年基金项目(50325516);;
国家科技支撑计划资助项目(No.2006BAE04B03)
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作者简介：
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参考文献：
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[1]苑世剑,王小松.内高压成形机理及应用[J].机械工程学报,2002,38(增刊):12-15.
[2]Vollertsen F.Hydroforming of aluminum alloys using heatedoil[A].9th International Conference on Sheet Metal[C].Leuven,2001.
[3]Geiger M,Merklein M,Hecht J.Warm hydroforming ofmagnesium sheet-results and microstructural changes[A].Advanced Technology of Plasticity[C].Italy,2005.
[4]Friedrich H,Schumann S.Research for a“new age of magne-sium”in the automotive industry[J].Journal of MaterialsProcessing Technology,2001,117:276-281.
[5]Yuan S J,Qi J,He Z B.An experimental investigation intothe formability of hydroforming 5A02 Al-tubes at elevatedtemperature[J].Journal of Materials Processing Technolo-gy,2006,177:680-683.
[6]齐军,何祝斌,苑世剑.铝合金管材热态内高压成形研究[J].航空材料学报,2006,26(3):99-104.
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