Analysis of stress and strain on deep drawing process of breaking-hub dust-cover

The models of the punch and die for the deep drawing process of the dust cover used in automotive axle breaking hub was established by CAD software,Pro/E,and then the deep drawing process was carried out by the FEA software,MSC.Marc.The metal flowing during drawing and the distributions of the stress and strain after drawing were studied,the effect of the blank holdering force and the clearance between the punch and die on the forming property were mainly investigated.The reasons,characteristics,influence factors and prevention measures of the fracture and wrinkle were analyzed.Both the simulation and experiment results show that,wrinkle occurs easily in the flange region,and the clearance between the punch and die is the main factor to influence the fracture.When the clearance between the rigid blank holder and die is less than 1.2 times of blank thickness,the workpiece with smooth surface quality can be obtained;when the clearance between the punch-die and the floating punch-die is greater than the blank thickness,the deep drawing process would be proceeded successfully.