Design Of Coaxiality Error Detection System Of Shaft And Hole Of Revolving Parts

Rotary parts are widely used in industry,agriculture,national defense and other fields.In order to ensure the manufacturing accuracy of rotating body parts in industrial mass production,it is very important to measure their dimensions quickly,accurately and automatically.The coaxiality error between the shaft and the hole is one of the important indicators for the accuracy evaluation of rotating body parts.This paper analyzes the detection status of coaxiality error,studies the key technology of coaxiality error detection using multi-sensor coordination,and mainly completes the following work:1.In view of the detection requirements of coaxiality error,combined with the existing measuring device of rotating body parts of the research group,a detection scheme based on the cooperation of contact sensor and visual sensor is proposed,which realizes the rapid detection of the coaxiality error of the shaft and the hole of the rotating body parts.The measurement models of the internal and external measuring components are analyzed,a unified coordinate system is established with the rotary axis of the turntable as the Z axis,and the positions of the internal and external measuring components in the unified coordinate system are determined.Solved the problem of coordinate system one in collaborative measurement.2.According to the principle of coaxiality error detection,the measurement scheme of the reference axis and the actual measured axis is designed: the contact sensor is used to measure the coordinates of the center of the circle of the hole section of the part,and the linear equation of the hole axis is fitted according to the principle of least squares.Take this axis as the reference axis;use the dual vision sensor to measure the coordinates of the center of the shaft section circle,and take the line connecting the center of the shaft section circle as the actual measured axis.3.The installation error of the contact sensor in the measurement host,the relative position error between the dual vision sensors,the geometric error and relative position error of the internal and external measuring components,the turntable error and other errors on the test results are analyzed,and the error measurement scheme is designed.Various errors are compensated.A number of system parameters in the measurement host were calibrated,including the installation position parameters of the touch sensor,the pixel equivalent of the vision sensor,and so on.4.In order to improve the automation degree of the measurement system,a loading and unloading system composed of parts conveying line and ABB robot was designed,and the operation program of the parts conveying line and ABB robot was written to realize the communication and cooperative work between each part.The measurement program of the measurement host is written,and the automatic detection of the coaxiality error is realized.The coaxiality error detection experiment is carried out on the standard rotating body parts.The experiment shows that the maximum error is less than 7μm,which meets the measurement accuracy requirements and verifies that the detection scheme is feasible.