Deformation Behavior Of Longitudinal Arc Rib U-shaped Cross-section Beam And Process Development Of Front Anti-collision Beam Of A Certain Car

In the car body structure,there are some longitudinal arc rib U-shaped cross-section beams(such as front and rear bumper anti-collision beams).Because the longitudinal arc ridge beam U-shaped cross-section beam has a certain curvature in the length direction,the deformation behavior of the straight U-shaped cross-section beam is much more complicated.In addition,the high-strength steel is prone to wrinkles,excessive thinning and cracking during cold stamping.Therefore,it is necessary to study the deformation behavior of high-strength steel longitudinal arc rib beam parts,and optimize the forming process and molds of this type of parts to guide actual production.First,this article starts with the forming process and deformation characteristics of the longitudinal arc rib U-shaped cross-section beam,and analyzes the stress and strain size and distribution of each area of the part during forming,the equivalent stress distribution,and the law of material flow in all directions through the simulation of the DYNAFRORM software.Explore the possible defects and how to solve the blanks.Secondly,using the longitudinal arc ridge U-shaped cross-section beam with different curvature,wing plate width and side wall height as the research model,the maximum thinning rate and maximum thickening rate evaluation index are used to analyze the causes of wrinkling and thinning of the longitudinal arc ridge beam.Through a combination of numerical simulation and theoretical analysis,summarized the influence of different factors on the quality of longitudinal arc ridge beam stamping,and carried out the stamping experiment verification of the parts of DC04,DC01 and high-strength steel DP590.Finally,taking the front anti-collision beam of a car as an example,the finite element simulation software of DYNAFORM is used to simulate and analyze its stamping and forming.Aiming at the problems of wrinkling,thinning and springback in part forming,blank optimization and mold profile compensation were carried out on the basis of multi-objective optimization.When the thickness met the rigidity strength,the best process parameters were obtained,within the springback of the part was controlled to ±0.5mm.In the enterprise,the parts were tested and debugged,and the obtained parts were tested by three-dimensional scanning equipment to meet the requirements of forming quality and dimensional accuracy.The results of this paper provide a valuable reference for the forming process development and actual production of similar beam structures.