Research on closing and opening of end after roll forming of open anti-collision beam
The problem of closing and opening of end of open anti-collision beam after roll forming was researched by simulation and test.Three typical open anti-collision beams were selected for analysis,and the variation rules of the closing and opening after roll forming were obtained by analyzing the effect of truncate angle and matching angle on closing and opening.The reason of closing and opening after roll forming was obtained by analyzing the stress of the section and the improvement measures were proposed.The effect rules of layout angle to closing and opening were obtained by analyzing the effect of anti-bending measures on closing and opening,and it was verified by test.The closing and opening were analyzed by four backward extruding schemes,and the optimal working condition was obtained by improving the scheme.The results show that when the layout angle of arcing wheel is fixed,the larger the truncate angle is,the smaller the stiffness of vertical rib is.The difference value of closing and opening decreases with the increase of the truncate angle.The phenomenon of closing and opening after roll forming is caused by the shear stress during roll forming,and the shear stress is caused by the height difference of the arcing wheel.Adjusting the layout angle of arcing wheel to form a reverse bend can reduce part of the internal stress and the difference value between closing and opening.The backward extrusion can reduce the difference value between closing and opening and the structure is the best when five shaping wheels are used.When the inner push wheel pushes 2 mm,the consistency of the anti-collision beam after roll forming is the best,but it also brings bad effect of flange warping.
anti-collision beamroll formingclosing and openingreverse bendingback extrusion
万方数据
维普
