Research On Automatic Leveling Method Of Precision Measuring Table

With the rapid development of precision equipment manufacturing and cutting-edge industry,the processing and assembly accuracy of cylindrical workpieces such as optical mandrels are becoming more and more demanding,which puts forward more stringent requirements for the level of such workpieces.For example,the cylindrical measuring instrument is a special measuring instrument for this type of workpiece,and the leveling method and technology of the leveling table directly affect the measurement accuracy and efficiency of the instrument.This paper reviews the structural composition and development process of the traditional automatic leveling device,analyzes the problems existing in the traditional automatic leveling device and leveling method,and proposes a new automatic leveling device and leveling method to provide reference for the research of high-precision automatic leveling device.This project carries out literature review,theoretical analysis and experimental research for the four-point automatic leveling method of precision measuring table,which provides theoretical basis and technical reserve for the subsequent construction of the entire precision measuring table for leveling.Firstly,in order to achieve the accurate adjustment of the workpiece on the precision measuring table,the structure and principle of the existing leveling device are analyzed in depth.On this basis,a new four-point automatic leveling device is designed,the leveling principle is introduced,and three-dimensional graphics are drawn with SOLIDWORKS.Secondly,a comparison was made between the angle error control leveling method and the position error control leveling method.Four types of position error control leveling methods were calculated and simulated for comparison.Thirdly,in order to solve the problem of inflection angle affecting the inclination angle due to the performance and installation position of the inclination sensor in the existing leveling device,the sensor probe is used to collect multiple sections on the surface of the workpiece,and the center of the circle is fitted with least squares,and then the center of the section circle is further fitted to an axis to calculate the tilt angle;Combined with the actual situation,due to the oblique placement of the workpiece,the sampling interval is non-equispaced,the abnormal signal is filtered by robust Gaussian regression filtering,and after 15 iterations,the tilt angle after treatment does not exceed ±0.04°,which is closer to the accurate angle and the change amplitude is more stable than when the filter treatment is not performed.Finally,the "highest point" fixed leveling method and the angle error leveling method are combined to adjust the legs in one direction,which saves the leveling time;The automatic leveling control interface is designed to facilitate automatic leveling after the subsequent construction of the precision measuring table;Leveling simulation was implemented with MATLAB.It lays a solid foundation for further application development in the future.