Fixture Design And Optimization Of Key Components Of CRH5 Cardan Shaft

At present,high-speed railway transportation still occupies the core position among the main transportation methods in our country due to its advantages such as fast speed,large transportation volume,and high efficiency,which has attracted widespread attention from related researchers.Different from other EMUs,the typical feature of CRH5 EMU is that it can adapt to harsh climates such as high cold,high temperature,high altitude,strong wind and sand,which has high adhesion to the special geographical environment of the northwestern region.The cardan shaft is an important part of the CRH5 EMU.It is the key fulcrum for transmitting the driving torque generated by the traction motor to the gearbox.Since universal joint shafts need to operate in different working environments and conditions,the quality requirements for universal joint shafts are often relatively high.Considering that this demand further aggravates the manufacturing difficulty of cardan shaft and it is not easy to mass produce,the design of matching fixture parts is very important to strengthen the applicability of the universal joint shaft.Based on the above circumstances,this subject has designed a fixture that matches the processing machine tool for the difficulty of machining key parts of cardan shafts and high production accuracy,and uses the adaptive gravity search algorithm to optimize the layout of the fixture,so that the fixture can satisfy The actual production needs,to improve the work efficiency of the universal joint shaft.The main research content and structure of this paper are as follows:(1)By understanding the structure of the fixture and using the raditional workpiece fixture clamping as the theoretical basis,the degree of freedom of the workpiece was definedand explained.And the model of the positioning and clamping principle of the key components of the cardan shaft was established.By means of Solidworks,the three-dimensional model of each component of the cardan shaft was designed,and the three-dimensional assembly of the cardan shaft was completed.(2)By analyzing the transmission characteristics of the cardan shaft of the CRH5 EMU,and supported by the processing technology of the components of the cardan shaft,the machine fixture matching each component was designed.And the three-dimensional design was carried out in the Solid Works software.The degree of freedom of each workpiece in the fixture is defined,and finally the assembly of the three fixtures is explained.(3)It improves the gravity algorithm based on the basic principle of the gravity search algorithm,and proposes an adaptive gravity search algorithm based on this.Theopposite learning method to enrich the initial population of the algorithm and realize the static state in the basic gravity search algorithm.The dynamic processing of the coefficient G uses the test function to verify the accuracy of the adaptive gravity searchalgorithm;After that,taking the deformation of the workpiece and the position of the clamping point as the optimization variable,using the finite element method,the position of different clamping points in the fixture is simulated and analyzed in the ANAYS.And the optimal layout scheme is obtained with the help of the optimization ability of the adaptive gravity search algorithm.