Issue 37

I. Mazur et alii, Frattura ed Integrità Strutturale, 37 (2016) 287-296; DOI: 10.3221/IGF-ESIS.37.38 287 Focused on Fracture Mechanics in Central and East Europe Quality Control system for a hot-rolled metal surface I. Mazur Lipetsk State Technical University, Russia. mazur_ip@mail.ru T. Koinov University of Chemical Technology and Metallurgy, Sofia, Bulgaria toni309@koinov.com A BSTRACT . The modern ideas about of quality of products are based on the principle of the absolute satisfaction of requirements of recommendations of the buyer. A presence of surface defects of steel-smelting and rolling origin is peculiar to the production of hot-rolling mill. The automatic surface inspection system (ASIS) includes two digital line video cameras for the filming of the upper and lower surfaces of the flat bar, block of illumination of the upper and lower surfaces of the flat bar, computer equipment. A system that secures 100 % control of the surface of rolled metal (of the upper and lower side) detects automatically and classifies the sheet defects in the real time mode was mounted in the domestic practice in the first time in 2003 on hot rolling mill 2000 JSC «Novolipetsk Iron & Steel Corporation» (NISC). The whole assortment of the mill 2000 was divided for the five groups by the outward appearance of the surface. The 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 than 10 thousand images of defects were added to the data base during the year. K EYWORDS . Hot rolling; Sheet; Quality; Control, Surface. I NTRODUCTION he modern ideas about of quality of products are based on the principle of the absolute satisfaction of requirements of recommendations of the buyer [1]. It is defined as a totality of product characteristics necessary for the use in accordance with its destination. The mechanical properties and geometrical adjectives of the flat bar are for the first turn such characteristics for the rolling. The main producers of metal production guarantee and document to the buyer these quality ratings at the today’s level of development of rolling-mill production. It is attained by the introduction of automated control systems and by the introduction of control of technological process [2-4]. The state of surface of rolled metal is a separate item of quality. The most mass use of control of surface is accomplished on the final process stages of production of metal production (after of cold rolling, etching, annealing, deposition and so on.). It excludes a delivery of production that does not meet the requirements of the buyer. If the process stage on which T