Study On Concave Anvil Cogging

According to the development and problems of heavy forging technology, two new technologies-CFAF and CVAF, which use concave anvil in the cogging process are brought forward. The two new technologies are simulated by nonlinear FEA software ANSYS. Results show that compare with cogging process using common flat anvil and common V anvil, using concave flat anvil and concave V anvil can increase the deformation at the center of the billet > improve the stress state of the center part and greatly decrease the reduction.Numerical simulation is also done to CFAF and CVAF technologies when parameter is different. Results show that ft is an important parameter in the new cogging process. The higher the value of , the better the effect of cogging. Effects of ratio of anvil width to billet widthy and reduction^ to CFAF and CVAF technology are also simulated. When 77 is different, considering the cogging effect, the range of y is given.Forging parameter optimization program DDGY1.0, which based on ANSYS and WHP optimization algorithm, is developed using FORTRAN language. The interface subroutine Interface is also programmed. The data is transferred by a file named Data, which written in ANSYS Parametric Design Language-APDL. The file Data can perform the functions including parametric modeling automatically grid loading and solving. Optimization research is done to CFAF and CVAF technology and the results are same as simulation.Experiment is carried through using lead billet and Grid Method. The data after cogging is processed by computer and the strain of the nodes at the center of the billet and the flat degree of the man-made holes is gained. Results show that cogging using concave anvil can increase the deformation at the center part of the billet and can press holes more effectively.