Experimental Research On How The Drawbead Have An Impact On The Subsequent Forming Properties Of Sheets

Sheet forming is one of the important branchs of material processing. As industry and economy developing, the shape and dimension precision of sheet metal part must need higher demand. As a important means of control sheet forming, drawbead is focused on by more and more scholars and manufactures. At present, the research on drawbead has obtained some progress,but the study on its effection on deformation and subsequent forming properties of sheet metal is deficient.First,this paper used single-factor rotation method,summarized the structure and geometric paramenters of circle drawbead impact on the force of sheet matel through drawbead,predeformation of sheet matel,thickness reduction, subsequent yieled linit,subsequent strength linit, subsequent elongation percentage by analysising a large number of experiments and experimental results. Draw the preferred range of geometric paramenters.Then made experiments study of circle drawbead and trapezium drawbead by orthogonal experimental design method.Based on the analysising of experimental results,summarized the level of imapct strength that the structure and geometric paramenters of drawbead(circle,trapezium) impact on drawbead restraing force,deformation and subsequent forming performance of matel,and draw the effect tendency of the structure and geometric paramenters of drawbead(circle,trapezium) impact on the force of sheet matel through drawbead,predeformation of sheet matel,thickness reduction,subsequent yieled linit,subsequent strength linit,subsequent elongation percentage. Provides a theoretical basis for drawbead design and adjustment.Based on above-mentioned work,this paper further analysis the ralationship of extra deep drawing sheet steel BUFDE+Z between predeformation which went through circle drawbead and trapezium drawbead and drawbead restraing force,subsequent yieled limit, subsequent strength limit and subsequent elongation percentage.