| Spherical plain bearing has the advantages of strong bearing capacity,high rotary precision,self-aligning,etc.It is one of the key parts in the aviation field.However,the outer ring of spherical plain bearing 17-4ph stainless steel has high hardness,thin wall thickness and small machining allowance,which is easy to cause clamping deformation and difficult processing.Therefore,it is of great significance to study the precision machining technology of spherical plain bearing and optimize the cutting parameters to improve the finishing quality and machining efficiency of spherical plain bearing.In order to meet the needs of small batch production of self-lubricating spherical plain bearing in the aviation science and technology laboratory,the thin-wall structure of the outer ring of the precision-machined spherical plain bearing was taken as the research object.The combination of theoretical analysis,mathematical modeling,finite element simulation,parameter optimization and experimental research is used to carry out the research on the precision machining technology of the spherical plain bearing and cutting parameter optimization.The main work content is as follows:1.According to the material properties,structural characteristics and technological requirements of the outer ring of the joint bearing,the finishing method and tool are preliminarily selected,the range of the cutting parameters is set,the clamping force calculation model is derived by using the static balance principle,and the finishing fixture is designed.2.Taking XRL20 R articulated bearing as a typical research object,the deform-3d software was used to carry out finite element simulation of its finishing process,and the key issues such as geometric modeling,mesh division and chip separation criteria in the simulation were deeply analyzed.The relationship between cutting parameters,cutting force,cutting temperature and tool wear was determined by using range analysis.3.Apply the optimal Latin hypercube design method for virtual test design,RBF neural network is adopted to establish an approximate model of cutting amount and cutting force,cutting efficiency,and to minimize cutting force,cutting efficiency maximization as the objective function to establish spherical plain bearing finishing cutting parameter optimization model,the application of ASA algorithm to complete the spherical plain bearing finishing process of multi-objective optimization of cutting parameters.4.Based on the above research results,the precision machining test of the spherical plain bearing was carried out.The three-dimensional laser scanner,surface roughness tester and profiler were used to detect the dimensional accuracy,surface roughness,form and position accuracy of the spherical plain bearing after finishing.The results show that the indexes of the spherical plain bearing all meet the requirements,verifying the accuracy of the fixture and clamping force calculation model,the reliability of the cutting finite element simulation and the feasibility of the cutting parameter optimization model. |
