Purpose. Justification of technical solutions as to the reduction of the amplitude and reduction of the dynamic change duration in the tension of the rolling stock at the exit of the output cage when moving to winding a new layer to an acceptable level in terms of its effect on the resulting profile of the rolled product through the control of the rotation frequency of an output cage. Methodology. The conducted research was based on a complex model of the process of rolled steel winding with a Garrett-type winder and the tension of rolled steel in the area of the exit cage-winder. To control the actual amount of tension at the output cage exit, it is suggested to use the amount of free deflection of the rolled steel directly behind the cage. The research was carried out by simulating the process of rolled steel winding according to the basic control scheme and control schemes that predict the influence on both drives, i.e. the winder drive and the output cage drive according to the actual value of tension, in various combinations with further analysis and comparison of the obtained results. Findings. It was established that the correction for the deviation of the actual rolling tension in the finishing cage-winder area from the specified value of the winding current of the winder electric drive does not eliminate rolling tension when switching to the next layer winding and the oscillating form of the transition process, which are characteristic of the basic rolling winding scheme. In turn, the correction of the rotation frequency of the output cage rolls drive reduces the amplitude of the roll tension jerk by almost half with a simultaneous reduction in the time of the transition process and readjustment when switching to a new layer winding. Originality. It has been shown for the first time that the introduction of the roll tension control circuit by correcting the high-speed rolling mode of the output cage ensures minimization of dynamic changes in the rolled steel tension when switching to a new layer winding and reduces the probability of local tightening of rolled steel profile. Practical value. The use of the described technical solutions in the control system of the section of rolled products winding of the small-grade wire mill DSDS 250/150-6 PJSC ArcelorMittal Kryvyi Rih ensures the improvement of the commercial properties of the winding of rolled products produced on the rolling mill.
The purpose of the work is to study the laboratory rolling mill 150 as an object of automation to establish the relationship between rolling parameters and the dimensions of the rolled products, as well as the implementation of the system of automated regulation of the thickness of the rolled products (SAR). The work is intended for further application in the educational process for the formation of students' competencies in the study of automation objects and the synthesis of SAR. Teaching students with the help of computer equipment and technological process simulation packages definitely made progress in education, allowed to quickly explore different modes of processes and obtain the necessary solutions to problems. But the lack of studies of real processes with real sensors and executive mechanisms and in the conditions of obstacles creates a feeling of ease in research and decision-making. The conducted experimental studies made it possible to establish the dependence between the thickness of the finished rolled product and the rolling force, the change in the thickness of the roll and the change in the gap between the rolls. The stiffnesses of the rolling mill and rolled metall were determined. The stiffness of the rolling mill is equal to 26801 N/mm and is much higher than the stiffness of rolled steel. It is shown that the line of plastic deformation of the rolled product has a significantly nonlinear character, the stiffness of the rolled product varies in the range of 618 - 7093 N/mm. It is shown that changing the inter-roll gap does not provide full compensation for the effect of changing the thickness of the roll. Research has also shown that to determine the necessary parameters, it is enough to have a limited number of lead samples, which allows you to apply experimental research in the educational process. The conducted experimental studies determined that it is possible to conduct them in the conditions of laboratory work performed by students, they allow students to gain the necessary experience in the study of the rolling state as an object of automation and the operation of the system for regulating the thickness of the rolled metal.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.