Abstract
Numerous studies have established that the damage to the lower surface of hot-rolled strips is mainly due to their friction against rollers of mill rollers. In this case, the probability of scoring, scrapes and other mechanical damage increases otherwise severe wear on the surface of the rollers, improper installation and jamming. This also applies fully to the pulling and forming rollers of the coilers. On modern broadband mills the following measures are used to prevent damage to the surface of hot-rolled strips: reduce the distance between the axes of adjacent rollers; Increase the accuracy installation of rollers in the horizontal plane; apply the individual drive of each roller; provide a smooth increase in the speed rotation of the rollers along the length of the withdrawing roller table; increase the wear resistance of rollers. A prerequisite for preventing damage to the surface of hot-rolled strips is also the maintenance of a high level technical condition of the mill equipment, which includes inspections of wiring armature bars, roller conveyor rollers and other units for each transshipment, timely replacement and repair of individual parts and assemblies (primarily roller conveyors, interroller plates, etc.).
Highlights
In the conditions of sharp and often unpredictable changes in prices for rolled metal and energy resources, the use of innovative technologies in rolling production makes it possible to significantly improve the efficiency of production and the competitiveness of manufactured sheet products [1]
Numerous studies have established that the damage to the lower surface of hot-rolled strips is mainly due to their friction against rollers of mill rollers
The resulting maximum values of equivalent stresses (27.5 Pa) do not exceed the maximum allowable value for the material of rollers 420 MPa. – Under the influence of applied vertical forces, the rollers elastically bend in the direction of the force, and the neck of the rollers elastically deforms in the same direction [5, 6], the maximum value of the equivalent deformation being for the roll of rollers 8,217Е-011, and for the neck of the rollers –7,061Е-011 of the proposed outgoing roller conveyor
Summary
In the conditions of sharp and often unpredictable changes in prices for rolled metal and energy resources, the use of innovative technologies in rolling production makes it possible to significantly improve the efficiency of production and the competitiveness of manufactured sheet products [1]. Researching by scientists from the far and near abroad have shown that the temperature conditions for rolling on continuous wide-band hot rolling mills (CWBHRM) and cooling on a retractable roller table are the determining factors for obtaining high-quality rolled products in terms of structure, mechanical properties, and flatness in a variety of thicknesses [2]. In this way, it is paramount to create efficient equipment and technologies that allow to reduce energy and labor costs for rolled products, reduce the consumption coefficients of metal and tools, improve the quality and improve the accuracy of rolled sheets [3]. On modern broadband mills the following measures are used to prevent
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