The Research And Development Of Measurement System For Non-contact Deep Hole Circle Roundness And Straightness

As a common mechanical part,deep hole parts are widely used in various fields.In addition to the diameter error of the inner hole,the roundness error of the cross section of the deep hole part and the error of the straightness of the axis are also important technical indicators in the processing process..The existing deep hole section roundness and straightness detection methods are cumbersome and the measurement accuracy is low,which is difficult to achieve accurate and rapid measurement of deep hole parts.Therefore,the cross section roundness and deepness of deep hole parts In-depth research on the measurement method of axis straightness error to ensure the precision measurement and manufacturing accuracy of deep hole parts is of great significance for improving the stability and life of deep hole parts.This paper proposes a non-contact measurement principle of the roundness of the cross section of the deep hole based on visual inspection and develops a non-contact roundness instrument.The non-contact roundness instrument uses a ring beam to reflect the geometric information of the contour circle of each cross section of the deep hole.The hexagonal plane mirror folds the optical path to reduce the volume of the device and form the measurement optical path.The ccd camera in the non-contact circularity meter calculates the geometric parameters of the contour circle of each cross-section of the deep hole by acquiring the six-segment light arc in the mirror.Information,so that the roundness error and center coordinates of each cross-sectional contour circle are calculated by the data processing center.Based on a non-contact roundness meter,a non-contact measurement system for deep hole cross-section roundness and axis straightness was developed.The measurement system includes: non-diffractive light spatial straight line reference,data processing system,roundness probe,among which the roundness probe It is composed of a non-contact roundness instrument,a posture measurement device,and a new type of self-centering mobile device.The measurement system is based on non-diffracted light as a spatial straight line reference,and combines the posture measurement device to obtain the contour circle of each cross section relative to the spatial straight line reference The spatial position information of each section unifies the measurement data of each cross-sectional contour circle into a spatial straight line reference.The calculation and processing through the data processing system can realize the precise measurement of the straightness of the deep hole axis.In order to realize the integration of the data of multiple components of the measurement system,this article defines each coordinate system in detail,and deduces the conversion relationship between each coordinate system,and establishes a mathematical model for the calculation of the straightness of the axis of the deep hole.Designed the structure,designed and manufactured a special self-centering mobile device,and produced a roundness probe prototype for measuring the roundness of the deep hole section and the straightness of the axis;the image processing program was written using the C ++ programming language and a set of data was developed Processing software,which can realize the synchronous data collection,storage and processing evaluation of the three cameras,and is verified by corresponding experiments to ensure the stability of the software.Finally,according to the measurement scheme,this paper formulates the calibration scheme of the non-contact roundness instrument in the roundness probe,performs the calibration experiment and compensates the measurement system.The uncertainty of the entire measurement system is analyzed.Demonstration experiments are carried out on parts with deep holes to ensure the stability and reliability of the measurement results and meet the technical index requirements of the measurement system.