Prediction of cylinder re-drawing performance

An equation was established to predict the limiting redrawing ratio of cylinder cup,which was based on the redrawing process,using slab method,friction theory and sheet bending/unbending theory around the die arc radius.Commercially pure titanium(TA1) cups were used for deep drawing experiments,and the effects of various parameters,such as average normal anisotropy,friction coefficient μ,half die cone anger α,radius of the die arc rd,cup thickness ration tmax/tmin on redrawing were discussed.The results show that the calculation from the model is in good agreement with the experimental results by the experiments,and the limiting redrawing ratio increases linearly with R,but decreases almost linearly with μ and tmax/tmin.