Study Of Forming Rules In Spline Tube Extrusion

Spline is usually employed for circumferential orientation of part, such as gear and pulley, and torsion transmission, as well as axial orientation and axial motion, with the particular section, long axial length, high accuracy and high surface quality, the spline tube has more strict requirements for the plastic forming process which is different from the other traditional forming process. Based on the analysis to the current spline forming process at home and abroad, the spline tube forming process was studied and the cold extrusion process was suggested. The cold extrusion process was introduced and the influential factors are researched.The spline tube's three dimensional data was gained with the help of three dimensional measurement machine. By the treatment to the measurement data in UG software, the accurate spline tube model was made, as well as the real dimension.The finite element model was made by finite element theory, and the simulation analysis with the DEFORM-3D software came up with the metal flow status and equivalent plastic stress-strain curves which are visible and meaningful.Simulation research and optimization were made to the spline tube cold extrusion process parameters and die structure, the pre-part and cold extrusion mill for spline tube production was also designed and selected. The influence law of the main influential factors, such as friction coefficient and cone angle , on the forming force were studied.Combined with the spline tube cold extrusion experiments and the reference to the simulation results, the die parameters are designed for punch and matrix. By the employment of theory to experiment, the measurement data came up with the influential law of several main factors on cold extrusion forming and the metal forming rules.