Abstract
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.
Highlights
The modern ideas for the quality of products are based on the principle of the absolute satisfaction of requirements and recommendations of the buyer [1]
Accumulated data base of knowledge automatic surface inspection system (ASIS) and digital images of defects detected by visual examination and identification of defects of surface of hot-rolled metal became a basis of that catalogue
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
Summary
The modern ideas for the quality of products are based on the principle of the absolute satisfaction of requirements and recommendations of the buyer [1]. Though the use of data base of knowledge of standard images of defects obtained on different metallurgical plants was possible, the stage of setting of ASIS for the automatic classification was performed in the manual mode. This is more laborious method of setting connected with the stoppages of units but effective because the precision of classification of unknown defects is increased due to visual inspection. Accumulated data base of knowledge ASIS and digital images of defects detected by visual examination and identification of defects of surface of hot-rolled metal became a basis of that catalogue. A rate of detection Pd and a rate of classification Pc according to the results of manual and automated detection of deffects of surface of hot-rolled metal was calculated:
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