Research On Deep Hole Straightness Inspection System Based On PSD

Deep hole parts are widely used in industrial fields and have high military and economic value.Straightness is an important performance indicator of deep hole parts,it often determines whether its product function can be realized.Small and medium-sized aperture deep-hole parts have the characteristics of large length-to-diameter ratio,complex inner wall shape,small space and relatively closed space,coupled with foreign technology blockade and the limitations of existing sensors,The two reasons jointly limit the development of China’s deep hole straightness detection.In some special fields,the detection of deep hole straightness still uses traditional manual detection methods such as triangular shadow method,measuring rod method,straightening telescope method,lever method,etc.,and does not form a unified and efficient automatic straightness detection method.In order to solve this problem,this paper designs a single laser dual PSD deep hole straightness detection system.The system makes up for the shortcomings of the traditional PSD straightness detection method and effectively improves the accuracy of straightness detection of deephole parts.Firstly,this paper analyzes the measurement principle of traditional PSD straightness detection scheme,Aiming at the two defects existing in the traditional PSD straightness detection scheme,a single-laser dual-PSD deep-hole straightness detection method was constructed.In this paper,the measurement principle of single laser double PSD straightness detection method is analyzed,the mathematical model of angle error correction is derived,the compensation of angle error is realized,and the mathematical model of three straightness error evaluation methods is established.Secondly,this paper completes the overall structural design of the single-laser dualPSD deep-hole straightness detection system and introduces the structural design characteristics and functions of each component module of the system in detail.The designed dual PSD acquisition module integrates two independent PSD sensors to realize simultaneous detection of spot spatial position and tilt angle;A new shrapnel-type selfcentering mechanism designed after simulation analysis using ANSYS software improves the centering accuracy during measurement;The top-notch,PSD adjustment and mobile mechanism designed and checked according to the requirements completes the execution of each specific action of the system.Thirdly,this paper elaborates the motion control requirements of the single-laser dualPSD deep-hole straightness detection system,completes the system electrical architecture and electrical component selection according to the specific control requirements,and completes the software development of the system based on the Lab VIEW software development platform.At last,this paper completes the measurement principle analysis,mechanical structure design,electronic and electrical architecture and system software development of the inspection system,and establishes a complete set of automatic straightness inspection system for deep-hole parts.The straightness detection accuracy of this system was calibrated using CMM.The results show that the repeatability error of the straightness detection system is less than 0.0033 mm,and the straightness detection accuracy can reach 0.003/400 mm.After calibration,use this system to measure the straightness of the target workpiece,The results show that the maximum deviation of the 6 measurement results is 0.0133 mm,and the maximum standard deviation of the sample is 0.0063 mm,it proves that the deep hole straightness detection system has good straightness detection repeatability and accuracy.