The Stretch Bending Analysis Of Extruded Profiles

In airplane and automobile industries, with the requirement of enhanced manufacture tolerance and the reduced costs, the advanced stretch bending technologies are gradually used in enterprise. But how to promote the whole manufacture process digitization, how to combine the CAD and CAE technology effectively and reduce the manufacture period and choose the reasonable forming parameters, all those problems needed more detailed study.Considering the complication of the forming process, to control the spring-back of extruded profiles precisely, the essential factors which caused the spring-back is required to understand, and on the basis the spring back control methods are put forward. In this paper, in order to keep geometry of the formed part in agreement with the product, the method of combination of CAD technology and the die's surface redesign are used to compensate die's geometry.In this paper, the mechanic theories are discussed firstly, the characters and defects of the theory methods used in the researches of the stretch bending analysis are studied. After obtained the primary influence parameters of the spring-back, the die face are compensated according to the product's shape and the forecasted value of spring-back. Further in the study, how to keep the geometry continuity of the die's surface after the compensation are considered. As verification, the finite element method is used to simulate the stretch bending process and calculate spring-back of the part formed in the compensated die. The simulation results show the corrective of the compensation method that put forward in this paper. Also in this paper the UG secondary development methods are studied to fulfill the analysis of stretch bending process and die face.