Research On Stamping Process And Mold Design Of B Pillar With Variable Thickness

With the increasingly serious environmental pollution，present lightweightautomobile aiming to reduce body weight to achieve energyconservation．There are some new material structures especially tailor rolledblanks to achieve lightweight car． As an important car body part， B-pillarplayed the role of resisting car bent inward．According to the analysis，themiddle segment of B pillar suffers the maximum bending moment，indicatingthat the distribution of its stiffness is very important，when the automotiveoccurs side impact． So variable thickness B-pillar designed as thick middleportion and small thickness of both end portions．Studying variable thicknessB-pillar molding and mold design are significant to move forward for car．Applying ABAQUS software for numerical simulation and studying theforming process of U-shape piece of variable thickness． Analysing how theprocess parameters and mold parameters effect on stress and strain distributionof formed parts，as well as the movement of the transition zone and reboundeffect．Knowing that BHF is the most important factor．Finding the differencebetween U-shape piece of variable thickness and equal thickness．Combining with the structural characteristic of the B-pillar and metalforming theory，to design the structure of variable thickness B-pillar formingparts．According to the existing theory to design variable thickness B-pillarmold and check the mold strength using finite element software．By analyzing the material flow and fracture position of variable thicknessB-pillar and improving blank ways to optimize blank shape．Discussing thestress and strain distribution of formed parts and transition zone mov ing underthe different combinations of BHF．Finally， applying Dynaform for analyzing weight loss of variablethickness automotive B-pillar， getting the weight loss rate is12.74%bycalculation，achieving good result of weight loss．...