3D measuring and evaluated method of springback in sheet metal forming

To overcome the problem that the springback value of sheet metal forming is difficult to accurately measure and the actual error can not be fully estimated,springback in sheet metal forming are studied using the close range photogrammetry system and the surface scanning system.A new method for getting the accurate spatial springback value of sheet metal forming is put forward.The principle,program and steps of this new method are studied.Coupled with this method,the other new methods for the evaluation of the sheet springback is put forward.The new evaluation indicator S of sheet springback,which consists of a space springback value and three values along x,y and z directions,.is defined.The springback value of a refrigerator door shell model has been detected and evaluated as an example.The results are expressed for the large surface of the refrigerator door the shell,space springback value are mainly depended on value of the z direction,the impact of y direction is relatively small and x direction is zero.The magnitude and direction of 3D space springback are keeped consistent with z direction.