Research On Visual Recognition And Quantitative Dispensing Technology Oriented To Assembly Of Bush Parts

Laser gyros are widely used in the aerospace field because of their excellent performance.In the automatic assembly of laser gyros,the dispensing of the surface of the bushing parts is an important process.Aiming at the problem of poor consistency of dispensing caused by high viscosity of glue in the process of manual dispensing,this paper carried out research on liner visual recognition technology and high viscosity quantitative dispensing technology.In order to accurately identify the type of bushing,research on the visual recognition technology of bushing parts was carried out.A size measurement method for bushing parts based on Canny operator is proposed,the camera is calibrated and a clear image is obtained,the effect of the filtering method is compared by the gray histogram,the Canny operator edge detection is performed on the filtered image,and then feature point extraction method is used to calculate the size,and the bush type identification is initially achieved.Subsequently,the measurement process of parts was improved,and the threshold selection algorithm of Canny operator was improved to adapt to the image of bushing parts,and the threshold was automatically selected.Then use region of interest(ROI)design,Hough transform and other methods to extract and fit the contour,and finally obtain the complete contour of the bushing part,control the measurement error within 0.1mm,and realize the accurate identification of the bushing model.The dispensing process is a complex process influenced by multiple parameters.Starting from the liquid bridge fracture mechanism,the main factors affecting the dispensing accuracy are determined,including viscosity,pin-plate initial distance,and pin-plate final distance.Establish a dispensing area model,use the computational fluid dynamics simulation software Fluent to dynamically simulate the dispensing process,analyze the simulation results and draw conclusions that as the viscosity increases and the needle-plate initial distance increases,the transfer rate decreases.Based on the mechanical dispensing mechanism including the vision module and the dispensing module,the dispensing process is experimentally studied.Quantitatively explore the effects of various parameters on the dispensing process to achieve high-viscosity quantitative dispensing.Using a high-viscosity glue with a viscosity of 40Pa·s,the quality of a single droplet is in the order of micrograms,and the error is controlled within 10%.A series of experiments are conducted to explore the influence of various parameters on the accuracy and a reasonable Dispensingparameter range.