Research On Time Sequence Flanging Forming Of Concave Flanging Model Based On Numerical Simulation

Flanging is an important forming technology in sheet metal forming process.The common defects in flanging process are cracking,wrinkling and springback.In view of the defects,many scholars put forward solutions,but most of them focus on changing the technological parameters of flanging process and the geometric parameters of flanging parts.There are few studies on the sequential flanging in the flanging process,and only a few thesis introduce this method and its influence on springback.In this thesis,it is found that time sequence flanging has an important influence on flanging fracture,and An optimal design method of sequential flangin g is proposed to study the influence of sequential flanging on the forming quality of sheet metal flanging of concave flanging model,so as to obtain better time sequence flanging forming tools,reduce the cracking trend,and improve the forming quality of sheet metal flanging of concave flanging model.In this thesis,the optimal design method of time sequence flanging is mainly used in the research of time sequence flanging of typical plane inner concave flanging model,and on this basis,the time sequence flanging of complex inner concave flanging model—swing arm parts is optimized.The main work is as follows:1.The typical planar concave flangin g model is studied by using the time sequence flanging optimal design method.This method combines the optimized Latin hypercube test design method,numerical simulation analysis technology,approximate model and multi-island genetic optimization algorithm in the optimal design process.The optimized time sequence flanging forming tool of the typical planar concave flanging model created has optimized its sheet flanging forming quality.In addition,the influence of the flanging height of a typical planar concave flanging model on its optimized flanging curve is further studied.The study find that with the increase of the flanging height,the optimized flanging curve of the typical in-plane concave flanging model has a trend that the maximum height difference of the flanging increases.2.A typical in-plane concave flanging mold is designed and manufactured.The flat bottom simultaneous flanging forming mold,the optimized time sequence flanging forming mold and its assembly parts are made.Physical stamping experiments are carried out to verify the e ffectiveness of the optimal design method of time sequence flanging and the reliability of the in-plane concave flanging simulation model created in this thesis.The experimental results show that the typical in-plane concave flanging simulation model is created accurately.3.Based on the optimal process of a typical planar concave flanging model,the complex concave flanging model—swing arm parts are optimized for sequential flanging technology.The optimized results of time sequence flanging simulation show that,compared with traditional ordinary flanging,the time sequence flanging technology can reduce the flanging fracture area,increases the minimum thickness of the swing arm part thinning area by 0.24 3mm,and the maximum thickness difference of sheet metal forming is reduced 0.2 50 mm,which improves the quality of sheet metal flanging forming of the swing arm parts,and makes the thickness value of sheet metal flanging forming more uniform.The optimal method proposed in this thesis can obtain the optimized time sequence flanging tool shape,improve the forming quality of the inner concave flanging model sheet metal flanging,and provide a meaningful reference for the forming of related parts.