Numerical Simulation Of Complete Stamping Process For Center Floor Panel Reinforcement Of Automobile

A large number of high-strength steel material is used to manufacture automobile body panels in order to improve the safety of automobile and to reduce the weight of automobile in recent years. However, such parts are not only difficult to manufacture but also prone to producing forming defects, which is seriously challenging to develop an economic and reasonable manufacturing process. The Finite element numerical simulation technology is an effective measure to solve this problem, this technology can forecast forming defects and mold design defects, which can shorten the development cycle of mold and product significantly.Currently, finite element numerical simulation technology has been widely used in the field of stamping forming of automobile body panels, however, researchers mainly focus on single-process forming numerical simulation rather than multi-step process forming numerical simulation. Complete stamping process simulation for center floor panel reinforcement of an automobile are proceeded in this paper by AutoForm. The results prove that complete stamping process numerical simulation can shorten the cycle of development and die tryout for the center floor panel reinforcement. In addition, the process program of the part is reasonable, which can provide a reference to the similar parts. The main contents in this paper are given as follows:1. The forming process design for center floor panel reinforcementThe manufacturability of product was analyzed and the forming scheme is drawing, trimming and piercing, restricting, cam-piercing. The drawing die surface was designed by AutoForm and CATIA collaboratively. The outer contour of product was expanded and the layout was designed based on Onestep module, the shape and size of blank was determined. A reasonable drawing finite element model was determined by simulation. By using the related functions of AutoForm, restricting surface was expanded on the die surface designed by CAD software and the trimming line was obtained. The sizing die surface was designed by CATIA and the restricting scheme was determined. The direction of piercing was define by importing lines from outside and the cam-piercing scheme was determined.2. The forming process optimization for center floor panel reinforcementThe influence of three process parameters including blank holding force, die clearance, friction coefficient on drawing forming was studied and reasonable interval value of each process parameters was given. Optimum combination of holding force, die clearance, friction coefficient was given based on orthogonal experiment. The trimming line was optimized by using trim module of AutoForm. The influence of blank holding force, friction coefficient on restricting process was studied, reasonable interval value and optimum combination of two process parameters was given.3. Analysis and compensation of springback for center floor panel reinforcementSpringback of the part after trimming and restricting were analyzed respectively. Springback of restricting region which exceed deviation was compensated by the compensator module of AutoForm.