Influence of Electric Upsetting Process Variables :,on Temperature Field Evolution by Multi-Field Coupling Finite Element Analysis

Electric upsetting is a complex electrical-thermal-mechanical multi-field coupling technology to the manufacturing process of exhaust valves. Generally, it is difficult to obtain the appropriate forming parameters in the practical industrial production. Thus, finding a convenient and reliable way to choose the optimum process conditions for electric upsetting is a non-trivial issue that still needs to be addressed in greater depth. Based on the multi-field coupling solver platform, MSC. Marc, a finite element model of electric upsetting was established, and then the influence of current and upsetting pressure on deformation were analyzed It is concluded that as current increases, the maximum temperature and diameter of the deformed material increases, meanwhile as upsetting pressure increases, the maximum temperature decreases, but the maximum diameter of the onion-shape increases. In addition, by means of a three-stage load mode of direct current, the secondary upsetting defect has been avoided. Finally, the finite element model was, validated by the results of physical experiments.