Research And Numerical Simulation On Formability Of Tailor Rolled Blank And Typical Automotive Components

Through the Tailor Rolled Blank(TRB) stamping of automobile covering parts have good rigidity and strength, it can improve the bearing capacity of the car, reduce the automobile weight.In order to promote cold Rolled plate application in car body, paper plate HC260 LA on domestic difference as the research object, by adopting the combination of theoretical analysis and microstructure observations and numerical analysis method for poor rolling plate bending resilience properties were studied. Using optical microscopy, scanning electron microscopy, energy spectrum analysis and other equipment for the steel sheet to organize and phase analysis, and the steel hardness and tensile mechanical properties test,theoretical analysis resilience plate by finite element simulation to verify the results of the analysis, the findings of this paper show that:(1) Due to the rolling action, massive ferrite steel is elongated in the rolling direction,fibrous grain size uniform, low steel high strength plastic, prone to large rebound Using ANSYS Workbench14.5 simulation software on domestic HC260 LA U-shaped steel pieces,to simulate the stamping process analysis of stress and strain distribution of steel plate and steel plate springback amount. Analysis results show that the stress and deformation of u-shaped piece are rounded parts is greater than the straight parts, the maximum thickness of sheet metal side rebound is 3.5°, the maximum rebound thin side is 4.1°.(2) To improve domestic HC260 LA the forming performance of variable thickness steel plate, steel plate for different solution heat treatment, We observated the organization of the steel sheet and determined of the relevant mechanical properties. Analyzed resilience steel in theory. Using ANSYS Workbench14.5 simulation software of U-shaped steel after heat treatment of stamping simulation, observe the stress and strain distribution of steel after heat treatment and the deformation of the steel plate and the springback amount.Simulation results show that : numerical simulation after 960℃ heat preservation 2 h water cooled and 700℃ tempering heat preservation after 3 h empty cold treatment after recrystallization, the organization of steel and carbides becomes smaller and more uniform.The yield strength is 252 MPa, elastic modulus is 208 GPa, tensile strength is 405 MPa Simulation results of U-shaped member resilience becomes small. And the overall rebound values more evenly, the maximum thickness of the side rebound is 3.4°, thin side maximum resilience value 3.7°; Heated to 840℃ for 3h water cooling treated steel sheet maximum resilience becomes large, The yield strength is 365 MPa, elastic modulus is192 GPa, tensile strength is 435 MPa, thick side maximum resilience value 3.8°, thin sidemaximum resilience value 4.3°, fillet bending stress distribution is more concentrated,Comparative analysis obtained by the heat treatment after 1 treatment program formability of the steel sheet has been optimized. Verified the theoretical analysis.(3) Poor plate HC260 LA as analysis object using ANSYS/LS-DYNA, the forming process of typical automobile parts car front longeron simulation, simulation thinning ratio,amount of springback after forming and stress distribution. Simulation results show that the stamping parts after the biggest thinning rate is 30%, the largest amount of springback is 3.48 °.