304 Stainless Steel Pull-physical Modeling And Numerical Simulation Of Deep Drawing

During the deep-drawing of stainless steel sheet, some defects such as strain hardening, wrinkling, sticking and fracture are easy showing, and their influent factors are so complex that it is difficult to study and control. In the present paper, the effects of processing conditions on the deep-drawing deformation of 304 austenite stainless steel sheet were investigated by means of physic simulation and numerical simulation. The primary contains and conclusions are as following:The influences of deformation rate on the mechanical properties of 304 austenitic stainless steel were studied by tensile test at room temperature. The results showed that yielding strengthσ_0.2 increased slightly and tensile strengthσ_b decreased a little with increasing the tension deforming rate, while the elongation decreased obviously and the ratioσ_s/σ_b increased intensely; The deforming rates have little effect on the hardening process of the uniform cold deformation; and by curve fitting the average data of the true stress and true strain, the constructive equation of the uniform cold tensile deformation for 304 austenitic stainless steel can be described as:σ=- 1638.43ε^{0.6328+.0.361lnε}(MPα)By applying the HHP98-120 sheet metal plastic deformation simulation testing machine, the friction coefficients for cylinder pieces of 304 austenitic stainless steel sheet during deep-drawing were measured and analyzed at different conditions. The results showed that the viscosity of the lubricator had great influence on the friction coefficient between the die and the piece. The higher the viscosity of the lubricator, the smaller the friction coefficient and the maximum force for deep-drawing.The deep-drawing deformation processes of 304 austenitic stainless steel sheet under diverse conditions were simulated by DEFORM-2D. The results showed that the limit height of deep-drawing decreased with improving the friction factor at the flange of the piece; and it might increase with raising the drawing rate or reducing the friction coefficient. By analyzing the numerically simulated results, it can be concluded that at the present conditions, the optimum parameters for the deep-drawing of 304 austenitic stainless steel sheet are summarized as: profile radius of the male die is r_p=3mm, profile radius of the female die is r_d=3mm, the friction factor at the flange of the piece is small as (1=0.08 and drawing rate is v _d=55mm/s.