Abstract
Aluminum alloy hot stamping technology can improve the formability of materials and obtain parts with high dimensional accuracy. Friction behavior in the hot stamping process is very important for forming quality. Accurate friction coefficient is helpful to improve the prediction accuracy of forming defects. It is hard to obtain the friction coefficient by simple experiments due to the complicated thermal–mechanical coupling and contact conditions during the hot stamping of aluminum alloys. In order to explore the effect of friction behavior on forming quality, hot stamping experiments of 7075 aluminum alloy U-shaped parts with different lubricants were carried out. The influence of different lubricants on the force–displacement curve, material inflow, surface appearance, and thickness distribution of the formed part was analyzed. The results showed that a good lubrication effect could be obtained with the molybdenum disulfide lubricant. The friction coefficient under different lubrication conditions was obtained by using the inverse problem optimization method. Compared with the experimental results, the determined friction coefficients could accurately predict the force–displacement curves and the thickness distributions of formed parts under different lubrication conditions.
Highlights
Automobile lightweight is one of the most important aims to reduce fuel consumption and air pollution [1]
The formability of 7075 aluminum alloy in T6 condition is poor at room temperature and it is difficult to form complex parts [3,4]
Friction coefficients under different lubrication conditions displacement curve, materialThe inflow, surface appearance, and thickness distribution of the were obtained by using an inverse problem optimization method
Summary
Automobile lightweight is one of the most important aims to reduce fuel consumption and air pollution [1]. The results showed means of strip drawing tests in the temperature range 200–450 ◦ C varying the normal that the friction coefficient presents an initial decrease as the temperature increases, folcontact pressure up to 10 MPa and the sliding velocity up to 50 mm/s. Zaba et al [12] studied the abrasive wear resistance 2024 aluminum alloy strips unfollowed by adhesion phenomena at the highest temperatures with material transfer der friction conditions involving various lubricants. The sliding friction experiment can obtain the friction coefficient under different predicting set lubricant-material for tools which can be applied to sheet metal made of temperatures and pressures. In hotthe stamping experiments of 7075 aluminum alloy U-shaped parts with friction actual hot forming process. Friction coefficients under different lubrication conditions displacement curve, materialThe inflow, surface appearance, and thickness distribution of the were obtained by using an inverse problem optimization method. The friction coefficients under different lubrication conditions were obtained by using an inverse problem optimization method
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