Study On Forming Performance Of Stamping Of Tailor Rolled Blanks In Varying Velocities

The heterogeneity of the geometric cross-section shape and mechanical properties of TRB(Tailor rolled blanks)increases the degree of non-uniform deformation in the forming process and reduces the press forming performance.The existence of thin,thick and transitional regions makes the TRB have obvious characteristics of regional deformation.According to the same strain point,a deformation domain is formed.There are multiple deformation domains in the process of forming TRB,and the crucial deformation domain of instability is The overall forming properties of the TRB play a decisive role.However,the accumulation of the deformation degree plays a decisive role in the forming properties of the crucial deformation domains.However,the accumulation of the deformation degree changes the crucial deformation domains.Therefore,this paper proposes the use of variable velocity forming for deformation characteristics of each deformation stage of a suitable TRB to improve its forming performance.This article will focus on the effect of forming velocity on the forming limit of TRB,using a combination of numerical simulation and experimental research to conduct in-depth research.The inhomogeneity of the cross-section thickness and the different stress levels during the rolling process are different in the mechanical properties and plastic deformation behaviors of the TRB.For this reason,the mechanical properties and plastic deformation behavior of the TRB were studied by using uniaxial tensile tests and finite element numerical simulations for the differences in the mechanical properties of TRB in various thickness regions.The thickness was established according to the principle of plastic mechanics.The stress-strain constitutive equation of the transition area is changed.Further analysis of the microstructure change,texture change,and fracture analysis before and after the tensile plate cracking.The results show that the thin and thick regions in the isopach region have excellent mechanical properties,while the transition region with varying thickness has lower toughness.When plastic deformation occurs,the plastic deformation in the equal thickness region develops uniformly and the plastic deformation in the transition region is limited to The local area is used to reduce the forming performance of TRB;the deformation behavior and fracture mechanism in the transitional and thick regions of TRB are different.The transition zone is brittle fracture,the thin zone is shear fracture,and the thick zone is ductile fracture.Thick plate plastic deformation mechanism.In order to study the influence of forming velocity on the forming performance of deep slab stamping,a finite element model for deep slab stamping was established.The influence of forming velocity and velocity and velocity pattern on the distribution and evolution of deformation domain was analyzed,and the difference in velocity increase was obtained.The process of setting TRB forming performance.The results show that the distributions and evolution laws of different stamping velocitys are similar for TRB deformation field.The only difference is that the reasonable stamping velocity and the variable velocity mode can effectively reduce the strain value in the key deformation domain and improve TRB.The forming properties.In the critical thick zone of the transition zone,with the increase of the depth of stamping,the deformation domain gradually spreads,shifts,and concentrates on the four corners of the bottom plate of TRB.This is a key deformation zone that affects the overall forming performance of TRB.The results of the study further indicate that the setting of the velocity turning point and the initial stamping velocity is the key to the setting of the velocity stamping process.A reasonable variable velocity forming can effectively improve the forming performance of the thick thick plate.On the basis of the above research results,stamping and forming experiments were used to investigate the distribution of wall thickness of parts.The law of the forming velocity was used to study the effect of stamping forming on bad slabs.The results showed that the maximum stamping velocity of Cr340 TRB was 50 mm/s,When the stamping velocity is greater than the limit velocity,the box part deepens and cracks.The initial stamping velocity is lower than the limit velocity 50mm/s for stamping.When the stamping depth is 22 mm,stamping is carried out at a velocity greater than the limit velocity of 60mm/s.The stamping result is in good condition,which proves that the stamping forming can effectively improve the difference.Thick formability.Because the numerical simulation results are consistent with the experimental results,the correctness of the above simulation analysis is verified.