Research On Light Transmission Measurement System And Key Technology For Raceway Parameters Of Ball Bearing Inner Ring

The parameters such as channel curvature radius and channel position of the ball bearing inner ring are the necessary inspection parameters in the processing of the bearing inner ring,and they are also important factors affecting the bearing quality.At present,with the rapid development of intelligent manufacturing,online inspection has become the key to intelligent production of bearings,and online inspection of bearing grooves is one of the difficulties.The current channel parameter detection methods are hard to meet the demands of detection speed,detection rhythm,reliability,etc.in online detection.Therefore,this paper takes the channel parameters of the inner ring of the 7006 C angular contact ball bearing as the measurement object,and studies the measurement system of the parameters of the inner ring channel of the bearing by selecting optical measurement methods,which can not only promote the development of the intelligent production line of bearings,but also improve the digitalization of my country’s bearing industry.The development of detection technology is also of great significance.Firstly,aiming at the problems of low efficiency and difficult to realize on-line detection in the contact measurement method of bearing inner ring channel parameters,based on the analysis of optical detection technology and the structural characteristics of bearing inner ring,a bearing inner ring channel parameter measurement system based on surface structured light transmission measurement method is designed.The principle of the method is analyzed and the mathematical model of the system is established.Secondly,based on the mathematical model,considering the possible errors in the measurement process,the error factors affecting the measurement results are transformed into two relative deflection angles of the workpiece relative to the fixed reference system.On this basis,the contour equation under the error factors is deduced,and the corresponding piecewise fitting algorithm is designed to obtain the parameters to be measured.The accuracy of the contour equation and the fitting algorithm are verified by simulation.At the same time,the feasibility of the light transmission measurement method in the detection of the channel parameters of the bearing inner ring is also proved.Then,based on the measurement principle,the system scheme design is carried out,and the hardware selection and image processing algorithm are completed.First the noise in the image is removed by median filtering,and the next step is to use the Canny operator to obtain the rough positioning point of the bearing inner ring contour,and then the eight-neighborhood boundary tracking algorithm is used to obtain the coordinates of the pixel points arranged in order.Then the sub-pixel edge point coordinates are obtained by the sub-pixel detection algorithm based on the improved Zernike moment.Finally,the slope of the edge points is calculated based on cubic spline interpolation,and the angle between the tangent vector and the coordinate axis is determined according to the order of the points,then according to the variation law of included angle,the abnormal data are screened out and the contour is grouped according to the characteristics.Finally,an experimental platform is built to verify the designed measurement system for the parameters of the bearing inner ring channel.After many experiments,it is shown that the parameter measurement accuracy of the system can reach 3μm,which meets the design requirements.At the same time,the error source of the measurement system is analyzed in detail,which can be used for system improvement.