Research On Testing And Analysis Technology Of Rotary Accuracy For Precision Rotating Shafting

The precision rotating shaft system is the core component of high-precision machine tools in modern machining.The rotation precision of the rotating shaft is an important measure to determine the machining accuracy of the workpiece.Therefore,the monitoring and quantitative analysis of the rotating precision is particularly important.The expression is the rotation error and the roundness error.The effective study of the two errors can effectively understand the working and health status of the equipment.Based on the three-point error separation technique,this thesis improves the precision of the rotation error separation of the precision rotating shaft system.The error assessment method was developed.Firstly,this thesis compares and analyzes existing error measurement and separation work and error shape evaluation work.Because environmental noise interference is unavoidable during the experiment,the principle and steps of frequency domain and time domain denoising method are determined for the original signal.After the pre-processed vibration signal,the data fitting method is briefly analyzed.For the uncertain components in the sampled signal,the source of uncertainty and the transfer process are briefly described.Secondly,the thesis compares and analyzes the current common methods of rotation error separation and compares them.Finally,the three-point error separation technique is selected and studied in depth.The principle and process of the method are described in detail.It is found that the noise signal transfer function is of great significance to the separation accuracy under the influence of noise.Therefore,the mathematical model with the noise transfer function as the optimization target is proposed.Considering the ?-norm of the component,the optimal state of the noise suppression effect is achieved and the optimal installation angle of the sensor that can improve the separation accuracy is obtained,and then the simulation analysis is performed.Then,through theoretical analysis,it is concluded that for the evaluation of the shape of the rotary error shape,the motion error of the rotating shaft can be changed to the linear error minimization problem.After observability and complex frequency domain analysis of the rotation error,Mathematical model for the evaluation of the rotation error of the shaft.For the single-section rotary error,the particle size group algorithm is used to optimize the results by using the minimum containment method,and the simulation results are evaluated.Finally,the experimental system of precision rotating shaft rotation accuracy test and analysis is constructed to realize the sampling and processing of the rotational axis motion error data,verifying the authenticity of the theoretical research in the thesis,and quantitatively analyzing the influence of uncertainty in the error separation process.The thesis focuses on improving the error separation accuracy of the three-point method and the evaluation method of the rotation error.The reliability and correctness of the error separation accuracy improvement method and the rotation precision evaluation optimization algorithm for suppressing noise signal transmission are verified by simulation analysis and experiment.The research content of this thesis involves high-precision machining and aerospace and other important fields.The testing and analysis of the precision of the rotating shaft of the rotating shaft is of great significance for the precision instrument processing industry and the industrial level of precision parts production.