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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 1    February 2002

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Effect of blank holder pressure on viscous 
pressure forming aluminum alloy ladder parts
WANG Zhong-jin(王忠金),WANG Xin-yun(王新云),WANG Zhong-ren(王仲仁)

School of Materials Science and Engineering,
Harbin Institute of Technology,Harbin 150001,China

Abstract:Viscous pressure forming (VPF),is suitable for forming difficult- to-form sheet metal parts. An investigation in the effect of blank holder pressure (BHP) on VPF aluminum alloy ladder parts was conducted.Based on experimental and numerical simulation results of the effect of BHP on dimensional accuracy, wall-thick ness reduction,forming pressure, material flow and defects (such as wrinkling and fracture) of specimens,the effect patterns of BHP load path on VPF ladder parts were explained.The limits of BHP corresponding to specimens with no defect and with wrinkling or fracture defect were determined.In the limits of formable BHP,the variable load path of BHP was beneficial to drawing blank into the die and decreasing wall-thickness reduction of specimens.The experimental results show that the ladder parts of good surface fineness and high dimensional accuracy can be obtained by variable load paths of BHP.

 

Key words: viscous pressure forming; ladder parts;blank holder pressure; aluminum alloy

ISSN 1672-7029
CN 43-1423/U

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