Tube necking extrusion principle and forming process of trailer rear axle

摘要

The rear axle which undergoes the heavy and alternating load is the key parts on the rear bridge of trailer truck. The rare axle with integrated structure has become the main developing trend because of reducing vehicle weight and increasing load capacity. After reviewed the status of the forming process, this paper researched the forming process of the integer rear axle on numerical simulation and experiment, and present a highly efficient new forming process. For tube necking process, the relation between main parameters such as semi-cone angle, temperature, forming velocity, friction coefficient and limited necking coefficient were studied. To improve the ability of a necking coefficient, the way of heating with a temperature gradient were used. The simulation result shows that it can greatly increase the necking coefficient. Based on theoretical analysis and numerical simulation, the forming process of rare axle with integrated structure were studied, experiment were done and the sample of rear axle were obtained. The experiment results were coincident with the simulation. The deformation and wall thickness increase law of necking process was obtained. The new forming process by end heating with temperature gradient was presented. It could be used to produce rear axle rapidly and less energy consumption.