Research And Experimental Analysis On Cold Extrusion Of Universal Joint With The Function Of High-Frequency Chattering

With the rapid development of China’s automotive industry, the demand for auto parts is more and more big, and the cold extrusion technology is also developing in this circumstance. Compared with cutting processing, cold extrusion technology with high production efficiency, material consumption, and better mechanics performance. But at the same time, cold extrusion technology, there also exist some disadvantages. Because the metal deformation resistance, in the forming process, is very big, the metal flow need very large extrusion pressure, therefore, the equipment requirements are very high; the Die is under a huge pressure from blank in the extrusion process, and the high friction is also existing, so life of dies is always limited. Therefore further researching is necessary to overcome these disadvantages of extrusion process, and make this a better technology for manufacturing services.This paper aims to do research on the forming conditions of universal joint with high-frequency chattering, and find out the influence of amplitude and frequency to load.Main contents of this paper are:(1) Deform is used to do numerical simulation to analysis the extrusion process of universal joint with conventional way and high-frequency chattering method. The results show that the load with high-frequency chattering is lower. And the mathematic model is also founded to analyze mechanism.(2) Adopted orthogonal method to figure out test groups that contain relationship of vibration parameter and forming load, obtained training data for neural networks via FEA, established neural networks, obtained the interpolated function by using linear regression analysis on neural networks, adopted genetic algorithm to optimize the global optimal solution of the mathematical function. The optimal solution was used for FEA, and then the feasibility of collaborative optimization of the combined die could be verified.(3) Design universal joint forming process, chattering table, die structure, according to the forming requirements, design the flutter table and die structure.(4) Experimental analysis. Collect the load value under different amplitude and frequency.