X-ray Real-time Imagery Based For Evaluating Internal Defects In Aluminum Alloy Parts Made By Die Squeeze Casting

In recent years,aiming to guarantee the car having good performance,The internal quality inspection is prepared to the car parts before exporting.The X-ray inspection as a kind of nondestructive test is widely applied for internal quality inspection of car parts.Traditional X-ray film has low efficiency and poor operability,which is unable to meet the need of car parts production.So as a new type of X-ray inspection method,X-ray real-time imagery,due to its high sensitivity,high efficiency and good operability,increasingly favored by automobile manufactures.But the theory of X-ray real-time imagery in production practice is researched rarely,which is unable to accurately solve encountered problems in production inspection and process optimization.Based on the parameters,working voltage and corresponding relationship between images and actual defects,guiding the internal quality inspection in production practices by theory.This paper studied the best process parameters of X-ray real-time imagery system in the actual production,the orthogonal experiment method was used to.study the process parameters including gain,brightness,contrast,gamma and denoising,through range analysis requiring that the gain and gamma are the main factors which affected the image quality leve.Through analyzing trend curves to determine the best process parameters are gain 400,brightness 40,contrast-20,gamma 360,denoising 9.Analogy method were used to study the X-ray real-time imagery system operating voltage by getting the relation curves among work voltage,parts thickness and the image level.For the optimal image,when part thickness ranging 10 mm to 20 mm,the thickness of each added 5 mm,required voltage increases 5 kV,when part thickness ranging from 20 mm to 25 mm,the thickness of each added 2.5 mm,required voltage increases 5 kV.Determination was made for the corresponding relationship between defect images and actual defects in this paper.The translation method was used to study of the position of defects in the parts and then summed up the formula of calculating defects position,through the experiments system correction coefficients A was obtained that was 0.85,the similar proportion method was used to study the size of the defects in the parts and then summed up the formula of calculating defects sizes,through the experiments system correction coefficients C was obtained that was 1.22.Empirical method was used to study the defects thickness of the X-ray direction,relevant atlas were obtained,which guided the production practice.