IMPROVEMENT OF THE PRODUCTION EFFICIENCY OF REINFORCEMENT SECTIONS AT THE OPERATING CONTINUOUS SMALL-SECTION MILL

Abstract

The article considers a promising combined method for increasing the production effi ciency of the section rolling profi les – rollingdivision with the use of non-powered dividing tool, the experience in the use of which in the conditions of production has shown high effi - ciency of this direction in terms of reducing the cost of the fi nished product. The dependences, which allow to defi ne the frequency separation, and high-speed conditions when deciding industrial introduction of process technology of rolling-separation on current continuous small-section mill 250. The existing experience of implementing the rolling process-separation model of continuous small-grade mill 250 has been reviewed, which allowed to reveal the peculiarities in the distribution coeffi cients of drawing and changing speed conditions for groups of stands. It was found that on the basis of capacity of rolling equipment on the mill, it is advisable to carry out the longitudinal separation of the workpiece into two bands in the fi nishing group of stands, and changes in the total coeffi cients of drawing and rolling speed on rolling groups were also identifi ed. The article presents data on changes in the machine time for reinforcing the profi le no. 10, no. 12, no. 14 in connection with the development of technology in the process of rolling-division, which in turn contributed to increasing eff ectivelySTI production of existing continuous small-section mill. Proven in the industry values of the total coeffi cients of drawing and rolling speed on rolling groups can be determined from the shown illustrations. In addition, the study process was carried out for experimental – industrial rolling of rebar no. 8 under conditions of continuous light section mill 250-1 of the rolling shop of JSC “EVRAZ ZSMK”. The authors have compared the coeffi cients of drawing and rolling speed in the production of rebar no. 8 on the continuous wire mill 250 and a continuous small-section mill 250 from the same piece – square 100 mm. The results are provided in the illustration, which shows that the use of the rolling process-separation allows to use four stands less than at the rod mill at production of rebar no. 8 at a small-section mill.