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.
Studying the operation of automated control systems using computers significantly re-duces the time, but does not give a complete picture of the system on a real object. Therefore, the use of real objects for the study of control systems in the educational process is appropriate and useful. The purpose of the study is to modernize the laboratory rolling mill 150, designed for rolling lead, tin and plasticine, and equip it with sensors and actuators. The manual pressure device of the rolling stand was replaced by an automated one, for which an worm gearbox was additionally installed, which allowed to increase the total gear ratio to 94.5. The thrust screws are moved from the AC motor, which is controlled by the DOP-103BQ operator panel and the MS-300 frequency converter with built-in PLC. As a displacement sensor used photopulse sensor PDF-3. The installed equipment and the developed software for the operator panel and the PLC provided high accuracy of in-stallation of pressure screws in the set position. Additionally, software was developed to measure the power parameters of the rolling process: the rolling force and the electrical parameters of the DC motor of the drive of the rolling stand. The software allows you to configure the board, ie select the type of board, the channels used to measure voltage signals, select measurement ranges, signal color on the graph, signal polling frequency, number of points to display on the graph, parameters of graph coordinate axes. In the process of measurement, the output of signals to the monitor screen is performed simultaneously. Before rolling, the measurement process is started using the keyboard or mouse and the change of parameters is displayed on the screen in real time. At the end of the rolling process, the measurement stops, and the graphs of parameter changes over time remain on the monitor screen, which allows you to quickly analyze the process. The measurement results can be saved in an Excel file and then the file can be viewed. The file stores: the time of measurement of parameters and the values of parameters those were measured. Measurement of power parameters and sizes of rolled products before and after rolling allowed to determine the stiffness of the stand and rolled metal, which is necessary to calculate the transmission coefficients of the automated tuning system of the rolling stand.
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