THEORY AND PRACTICE OF RESOURCE-SAVING TECHNOLOGIES OF MILL BAR PRODUCTION AT THE OPERATING CONTINUOUS ROLLING MILLS

Abstract

Based on the modeling results of the processes of high-quality rolling in calibers of a simple form, the flow patterns of surface layers of the blanks and their influence on the formation of stress-strain state of the metal in the rolling process have been determined and confirmed experimentally. Subject to the formed recommendations a new calibration of rolls of roughing mill of continuous light-section mill 250-2 of OJSC «EVRAZ ZSMK» has been developed and passed the trial approbation. Its use has increased the yield in the production of high-quality rolled structural steel by 3 %. The evaluation to improve the production efficiency by increasing productivity in the implementation process of rolling-separation under the existing continuous light-section mill 250-1 of OJSC «EVRAZ ZSMK» has been conducted. A technique for determining the multiplicity of separation depending on the desired performance increments has been offered, as well as provided the guidance on the calculation of the speed limit in the roughing and finishing stand continuous mill, the actual data on the change of the total reduction ratio and speed conditions on groups stands in the preparation of rebars no. 10, no. 12, no. 14.