针对常规变形方法难以实现的轻合金板成形问题,综合固体颗粒介质成形和超声振动塑性成形技术,提出超声激励颗粒介质成形工艺。采用ABAQUS对变幅杆及凹模按照20 k Hz工作频率进行设计并展开模态及谐响应分析,并以此为基础,设计并制造了...针对常规变形方法难以实现的轻合金板成形问题,综合固体颗粒介质成形和超声振动塑性成形技术,提出超声激励颗粒介质成形工艺。采用ABAQUS对变幅杆及凹模按照20 k Hz工作频率进行设计并展开模态及谐响应分析,并以此为基础,设计并制造了最大输出功率1.5 k W的板材超声激励颗粒介质成形模具,进行AZ31B筒形件热态拉深试验,研究超声振动对板材颗粒介质拉深成形的影响。结果表明：超声激励促进颗粒介质的流动性及其传压性能;超声激励影响镁合金板材的极限拉深比,在振幅为6.7～11.6μm范围内,该极限拉深比呈现先增加后降低的规律。超声振动可以降低最佳压边力及成形载荷并抑制法兰区起皱,并且成形载荷随着超声振幅的增加,载荷降低比例越高。展开更多
Hot granule medium pressure forming(HGMF) is a technology in which heat-resistant granules are used to replace liquids or gases in existing flexible-die forming technology as pressure-transfer medium. Considering the ...Hot granule medium pressure forming(HGMF) is a technology in which heat-resistant granules are used to replace liquids or gases in existing flexible-die forming technology as pressure-transfer medium. Considering the characteristic of granule medium that seals and loads easily, the technology provides a new method to realize the hot deep-drawing forming on high strength aluminum alloy sheet. Based on the pressure-transfer performance test of granule medium and the material performance test of AA7075-T6 sheet, plastic mechanics analysis is conducted for the areas, such as the flange area, force-transfer area and free deforming area, of cylindrical parts deep-drawn by HGMF technology, and the function relation of forming pressure is obtained under the condition of nonuniform distribution of internal pressure. The comparison between theoretical result and experimental data shows that larger deviation occurs in the middle and later period of forming process, and the maximum theoretical forming force is less than the experimental value by 24.6%. The variation tendency of the theoretical thickness curve is close to the practical situation, and the theoretical value basically agrees well with experimental value in the flange area and the top area of spherical cap which is in the free deforming area.展开更多
文摘针对常规变形方法难以实现的轻合金板成形问题,综合固体颗粒介质成形和超声振动塑性成形技术,提出超声激励颗粒介质成形工艺。采用ABAQUS对变幅杆及凹模按照20 k Hz工作频率进行设计并展开模态及谐响应分析,并以此为基础,设计并制造了最大输出功率1.5 k W的板材超声激励颗粒介质成形模具,进行AZ31B筒形件热态拉深试验,研究超声振动对板材颗粒介质拉深成形的影响。结果表明：超声激励促进颗粒介质的流动性及其传压性能;超声激励影响镁合金板材的极限拉深比,在振幅为6.7～11.6μm范围内,该极限拉深比呈现先增加后降低的规律。超声振动可以降低最佳压边力及成形载荷并抑制法兰区起皱,并且成形载荷随着超声振幅的增加,载荷降低比例越高。
基金Projects(51305386,51305385)supported by the National Natural Science Foundation of ChinaProject(E2013203093)supported by the Natural Science Foundation of Hebei Province,China
文摘Hot granule medium pressure forming(HGMF) is a technology in which heat-resistant granules are used to replace liquids or gases in existing flexible-die forming technology as pressure-transfer medium. Considering the characteristic of granule medium that seals and loads easily, the technology provides a new method to realize the hot deep-drawing forming on high strength aluminum alloy sheet. Based on the pressure-transfer performance test of granule medium and the material performance test of AA7075-T6 sheet, plastic mechanics analysis is conducted for the areas, such as the flange area, force-transfer area and free deforming area, of cylindrical parts deep-drawn by HGMF technology, and the function relation of forming pressure is obtained under the condition of nonuniform distribution of internal pressure. The comparison between theoretical result and experimental data shows that larger deviation occurs in the middle and later period of forming process, and the maximum theoretical forming force is less than the experimental value by 24.6%. The variation tendency of the theoretical thickness curve is close to the practical situation, and the theoretical value basically agrees well with experimental value in the flange area and the top area of spherical cap which is in the free deforming area.
