Abstract: The microstructure and mechanical properties of different parts in tailor rolled blanks(TRBs)were studied and the differentiation was explained. A finite element model was established to simulate deep drawing process of the square box from TRB and the effects of the thickness and non-uniformly distributed mechanical properties on the model setup were discussed. After comparison the experimental and simulation results， the reliability of the numerical model was verified. Taking the limit drawing height and the offset of thickness transition zone(TTZ)as the evaluation criteria， the effects of the geometric parameters(i.e. the length and position of the TTZ， and the thickness difference between the thin and thick area)on the formability of TRB were analyzed. The results show that when the TTZ length is longer， the distance between the TTZ and thin area is smaller and the thickness difference between thin and thick areas is smaller， the formability of TRB is better. Therefore， determining the geometric parameters of TRB need to consider the formability and light-weight effect.

Key words: tailor rolled blank(TRB); square box; deep drawing test; finite element simulation; light weight