| In recent years,cylindrical roller bearings with trilobe wave raceways in the outer ring are used to solve the problem of light-load skidding damage for aero-engine high-speed mainshaft bearings,however,the trilobe waveform difference of the outer ring raceway has an extremely important impact on the accuracy and life of the bearing and the reliability of the aero-engine to meet the working conditions.Currently,in the process of designing and manufacturing aviation bearings.The measurement of the trilobe waveform of the outer ring raceway of the cylindrical roller bearing mainly adopts the traditional manual detection method,its accuracy and stability are difficult to guarantee.At the same time,due to processing and measurement errors,The reliability of the measurement results of the trilobe waveform of the outer ring raceway of the cylindrical roller bearing has also become an urgent problem to be solved.In this paper,aiming at the above problems,the detection technology of the outer ring raceway of the trilobe wave aviation bearing is studied.Analyze,derive and establish the machining dynamics model of the grinding system of "wheel spindle-ring-pre-deformation fixture",using Riccati transfer matrix method,calculate the influence law of grinding wheel spindle speed and ring fixture speed on raceway waveform error,use the calculated result as the error compensation value of the raceway waveform result value formed after actual processing,provide a theoretical basis for reducing measurement errors.Analyze the formation mechanism of the trilobe raceway waveform error of the roller bearing,the least square method is used to fit and compensate the trilobe waveform error after measuring the base circle,an error fitting algorithm suitable for trilobe waveform is studied.In the case of meeting the design requirements of the raceway waveform,the shape error of the bearing raceway waveform is given,and the error compensation of the trilobe waveform after measuring the base circle is used to reduce the measurement error of the trilobe waveform.According to the trilobe waveform error compensation method,the corresponding measurement software program is developed on the three-coordinate measuring machine,and the principle of the ring raceway measurement is analyzed.The different functional modules are completed with independent functions,strong internal sealing,and better coupling with external interfaces.Few program modules are packaged into categories,and the established trilobe wave measurement program for the outer ring raceway of the rolling bearing can be post-processed according to the system adopted by the coordinate measuring machine.Use a three-coordinate measuring machine for actual measurement verification.The ring raceway measurement test shows that the error fitting optimizes the waveform error amount,which can effectively reduce the measurement force fluctuation,improve the measurement environment,and reduce the waveform profile error fluctuation caused by the force deformation.It is proved that the coordinate measuring machine is suitable for the measurement of the outer ring raceway of the raceway bearing.After the error fitting compensation,the measurement waveform error is significantly reduced compared with that before compensation,indicating that under the normal working condition of the measuring machine,the waveform profile caused by the installation accuracy of the measuring machine,the accuracy of the servo system,and the stability of the three-axis work can be effectively reduced error.The research on the detection technology of the outer ring raceway of the trilobe wave aviation bearing provides a scientific reference for the accurate measurement of the non-circular raceway of the roller bearing.It has important theoretical significance and application value. |
