关键词: 固体颗粒介质成形, 拉深, 圆筒形件

Abstract: Solid granule medium forming(SGMF) technology is applied to the deep drawing for cylinders of sheet metal, and the corresponding mechanical model under this condition is established. On the basis of the pressure-transfer attenuation model, the formula of desired unit punch pressure during the forming process has been obtained through mechanical analysis on the straight wall zone, which demonstrates that after the straight wall zone of the cylinder comes into being, the maximum unit punch pressure will linearly decrease gradually with the drawing coefficient increases; it also turns out that increment of friction coefficient between the sheet and the female die surface will result in a quite obvious tendency of increase in unit punch pressure; nevertheless, increment of that between the sheet and the solid granule medium will otherwise minish the unit punch pressure. Furthermore, with the increasing of the initial medium loading height, the unit punch pressure increases, which is resulted from the gradual attenuation of stress transfered by granule medium with the transferring distance grows. Additionally, magnesium alloy sheet as subject investigated, the deep drawing experiment and finite element simulation based on SGMF technology have been conducted, which has verified that the experimental and simulation results are in good agreement with the theoretical one.

Key words: Cylinder, Deep drawing, Solid granule medium forming