Research On The Principle And Detection Technology Of Magnetic Imaging Of Barrel Riflin

The distance accuracy of the electronic time fuze is one of the main factors affecting the air blasting accuracy of the electronic time fuze,and the muzzle velocity error is the main factor affecting the distance accuracy of the electronic time fuze.The machining error of rifling entanglement Angle of gun barrel has great influence on the velocity measurement accuracy of air blasting fuze.Therefore,in order to reduce the distance error of air blasting fuze and improve the accuracy of air blasting,it is of great significance to carry out high-quality rifling detection of gun barrel.In the current researches on rifling detection of barrel,most detection methods combine the bore creeping robot and CCD camera to detect and analyze the rifling of barrel.Due to the size limitation of robot and camera,these research methods are not suitable for rifling detection of small caliber barrel.In this paper,a rifling magnetic imaging detection system is designed for the barrel of small caliber gun.Through experiments,it is found that the magnetic images of rifling of small caliber barrel with high quality can be detected,so as to solve the above problems.In this paper,based on the unique advantages of TMR sensor in nondestructive testing,a magnetic image sensor is selected and its structure and working principle are introduced in detail,so as to analyze the principle and method of rifling magnetic imaging of body tube with this sensor.Around the principle of magnetic flux leakage detection technology,The Maxwell3 D module in the finite element software ANSYS Electronics Desktop was used to conduct magnetic flux leakage simulation analysis on the simple model of steel plate grooving and the actual metal plate model with rifling area of small bore barrel by means of magnetic field excitation and permanent magnet excitation respectively,and a general conclusion was drawn.It provides a theoretical basis for the specific operation scheme of testing experiment.In this paper,the overall structure,hardware part and software part of the rifling detection system of small caliber barrel are given a detailed design scheme.In the overall structure design,the core structure-clamping centering device is optimized and improved and the mechanical simulation analysis is carried out to prove the practicality of the structure.In the hardware circuit design,based on STM32 microcontroller has the advantage of ADC with high sampling rate,combined with magnetic image sensor,the rifling signal acquisition circuit of the body tube is designed.In the software design,Keil MDK software development environment,combined with STM32 CUBE MX and HAL library are used to program the data acquisition module to complete the software design of the lower computer of the detection system.Then,Lab VIEW software is used to write programs to realize the processing and analysis of serial port data.Then the imaging program is written by the visual development module VDM of Lab VIEW,so that the data collected by magnetic sensor can achieve the effect of magnetic imaging of rifling area on the surface of metal plate,and achieve the expected design purpose of the subject.Finally,the paper builds experimental environment needed for detecting system,in view of the different ways of excitation grooves magnetic imaging testing experiments respectively,verify the validity of the simulation results and analysis,choose the magnetic image quality can make grooves highest experiment scheme,so as to realize the small-bore tube body grooves for the purpose of high quality,The detection system designed by it is of general and practical value in rifling detection of body tube.