Issue 37

I. Mazur et alii, Frattura ed Integrità Strutturale, 37 (2016) 287-296; DOI: 10.3221/IGF-ESIS.37.38 291 Only the defects that are the deffects from the point of view of the expert were taken into consideration at the calculation of the rate of detection of defects but а class of deffect назначенный for them by the system in automatic mode was not taken into consideration. Altogether 16 rolls were examined in the course of guarantee tests. The analysis of the obtained results showed that the main surface deffects of hot-rolled flat bars are skins (ingot and stitch) and also the bubbles and rolled-in foreign particles . The rate of detection and a classification of these defects amounted 100 % and 94,2 %, 95 % and 95 %, correspondingly. The level of detection of pseudo-deffects (drops of water, «not deffects») amounted 99 % and 98,3 % of the classification. The average rate for the selected lot of detection of deffects is equal to 99,7 % at the classification in 97,3 %. So the guarantee indices were confirmed and the ASIS was put into commercial operation. U SING OF RESULTS OF DETECTION AND CLASSIFICATION OF DEFECTS he works on the identification of defects of hot-rolled metal and widening of data base of knowledge of ASIS were continued after the carrying out of guarantee tests. More tan 10 thousand images of defects were added to the data base during the year. The images of skins (ingot and stitch), slags, rolled-in foreign particles, cracks (longitudinal and transversal), hairlines, imprints, riffle, edged cracks, water and other defects detected on the surface of hot-rolled metal are among them. A high rate of detection and a classification of surface defects on the hot-rolled metal, generated volume data base of knowledge and a catalogue of digital images of defects created an objective basis for the realization of tasks connected with the use of results obtained from ASIS. A software executed in the form of separate applications was worked out in LSTU [9-11]: digital catalogue of images of defects (Fig. 2); Figure 2: Digital catalogue of defects of surface of hot rolled metal T