Theoretical Analysis on the Modified Criterion for Sheet Metal Drawing Capability——TLDR

A modified criterion for sheet metal drawing capability was proposed. The Technological Limiting Drawing Ratio, TLDR= f(R,n,σ s , t,F,μ,r d , r p , G ap ,…), that is, both the mechanical properties of blank and the technological parameters are treated as variables in the case of TLDR. A new formula was derived to predict the TLDR, and theoretical analysis on the effects of each parameter was carried out based on the formula. TLDR is not the drawing capability of sheet metal under a fixed operating condition, it is the practical drawing capability of sheet under different operating conditions, so accurate prediction of TLDR will help avoid the blindness in the selection of sheet metal before drawing. The formula can be used to predict TLDR (the results show good agreements with experimental data). Besides, it is the base on which further experiments will be carried out and a model of neural network will be constructed.