3D Reconstruction Of Internal Defects In Forgings Based On ICT

Industrial forging is the kernel component of the industrial equipment, and there are some defects, such as voids and cracks in the process of production, make bad affect to the quality of industrial equipment, so the industrial forgings accurately detect internal defects and its internal defects of three-dimensional shape, spatial location, spatial information such as size, deformation gradient, for determining defect type scientifically and accurately, grade and industrial equipment can be served, has the very high research value. In recent years, with the development of non-destructive testing technology, ICT is used as the measuring method, it has becoming an important tool of non-destructive testing technology. Industry computed tomography can not get the 3D information of the defects, for further analysis of the reliability of the forgings, it is necessary to study the defect of 3D surface reconstruction.This paper in view of the accuracy of traditional 3D reconstruction algorithm model is low, the time of reconstruction is long, the boundary of reconstruction is limited to the conditions of contour, studied the image 3D reconstruction technology, mainly include the fault contour matching technology, triangle subdivision technology linght transmission technology and entity transformation technology, the main contents of this paper are as follows:(1)In view of the existing surface reconstruction algorithm is difficult to solve the problem of adjacent image the adjacent image contour error corresponding, based on the method of centroid matching and elliptic curve, according to each the centroid of contour determine the preliminary of corresponding relation of the adjacent contour, according to the similarity parameters resulting from ellipse fitting adjacent contour matching, in order to improve the precision of 3D reconstruction model.(2)In view of the existing algorithm in polygonal contours is difficult to splice, put forward the method that based on Delaunay triangulation subdivision vertex adding and removing, selecting and adding the contour vertex in the crotch to the triangle subdivision, the experimental results show that the 3D model obtained by this method is more accurate.(3) In view of the existing volume rendering algorithm has large calculation and low efficiency, through light projection algorithm for volume rendering, and optimize the light projection algorithm, calculating other sample point coordinates in space by the key sample points, reducing the overall amount of calculation, in order to improve the efficiency of algorithm.(4) In view of the triangular mesh surface model are difficult to translate into solid model, though ANSYS parameter design language to transform the surface model into entity model.