|
Abstract The multi-action forging process is one of the developing directions of forging technology. In this study, the mechanism design of multi-action on the forging die set will be discussed. At first, using simulation software “DEFORM” is used to analyze the stress, strain and material flow of the billet. The optimum conditions of the multi-action forging process will be investigated and established by the simulation results. According to the optimum conditions, the multi-action mechanism will be tried by a screw set. Finally, the feasibility of multi-action die set design is investigated by forging the spider with plasticine. According to the results of DEFORM simulation , the conventional forging process needs the highest load and the material flow in the single direction of multi-action forging process is non-uniform. When the velocity ratio of the upper punch relative that of to die in double directions of multi action forging process is two to one the material flow is uniform with no defect and the lowest load, that is the optimum condition. According to the condition, the design variables of the multi-action forging die set are as follow: The diameter of upper screw bar is 30mm and the angle fo upper screw is 60°. The outer diameter is 60mm ,inner diameter is 30mm for the lower screw tube and its screw angle is 23.4°.Then, the forging experiment with plasticine are proceeded and the shows that the results is confirm with the DEFORM simulation data. Therefore, it is practicable to control the relative velocity between the upper punch and die by using screw set design for multi-action forging process to obtain the expected forming condition. keyword:multi-action , screw , plastic
|