Gavrilchenko E. Improvement of the process of editing hot-rolled sheets and design parameters of sheet-straightening machines for its implementation

Object of research - Technologies and equipment for straightening hot rolled sheets. The purpose of the work is improving the quality of products and expanding the range of levelers by improving the technology and equipment of the straightening processes and developing methods for their calculation. Research methods – methods of elasticity and plasticity, including methods of numerical iterative solutions provided continuity dimensional geometric parameters of the line leaves the implementation process of leveling; finite element modeling; method planned experiment; the method of physical modeling and the method of similarity for the implementation of experimental studies; methods of strain gauges, measuring geometric parameters and expert evaluations based on elements of the theory of probability and mathematical statistics. Theoretical and practical results – a complex of techniques and corresponding to them software tools for automated calculation and designing of technologies and equipment of processes of multiple change-bending with differentiated application of forces on the width of the sheet, which ensures a reduction in the complexity of the corresponding design and technological works; practical recommendations for improving the technological modes of operation, equipment structure, basic design parameters and settings of mechanical equipment of sheet-bending machines with the possibility of differentiated application of forces on the width of the sheet, which ensure the expansion of the assortment, improve the quality and economy of material resources in the production of hot-rolled sheets, four of which are recognized as inventions. Novelty – for the first time on the basis of the three-dimensional analysis, the regularities of the stress-strain state of the metal when straightening the unevenly distributed widths of plane defects are established by means of a differentiated force application of the width of the corrected sheet; for the first time, the influence of the structural parameters of sheet-type machines with the differentiated application of the force of straightening on the width of the sheets, in particular the number of bending rollers, and their bending dimensions on the plane of hot-rolled sheets, are corrected; the regularities of the penetration of plastic deformation on the height of the section of hot-rolled sheets at the straightening are specified on the basis of the improvement of the one-dimensional mathematical model of the stress-strain state and the resulting plots indexes when straightening hot-rolled sheets on multi-wire machines, which includes numerical iterative solutions of the conditions of continuity of the geometric parameters of the elastic line. Introduction – the technology and equipment for straightening sheets with the bend of rollers have been tested and accepted for implementation in production, which is confirmed by the act. Scope – treatment of metals by pressure.