Sklyar V. Development of the theory and technology of deforming continuously-casting billet under incomplete crystallization and subsequent rolling in the box pass

Object of research is two-stage compression process of continuous casting billets at the stage of incomplete crystallization and its subsequent rolling in the box pass. The purpose is establish a mechanism of the formation of "romboidity" of continuously billets, and the stress-strain-state of the metal when it is deforming in a partial crystallization to improve the technology of continuously deforming billet of rectangular cross section under conditions of incomplete crystallization of the metal, as well as technology subsequent rolling of continuously square billets in the box pass to eliminate or reduce "romboidity". Industrial research forms of billets and rolled up from them, as well as mathematical and physical modeling of rolling, met with the main provisions of the OMD, plasticity theory, solid state physics, continuum mechanics and the theory of heat conduction. The method of finite element analysis and experimental design is used. Experimental studies of deformation processes of continuously billets are made on laboratory mills 100 and 200 of the department "Metal Forming" at "Donetsk National Technical University". For the simulation of metal forming equipment used in modern control temperature conditions simulating the handling of materials, as well as the personal computer for statistical processing of data. For the first time by modeling the regularities of the physical strain penetration into the inner zone of continuously rectangular billets during their two-stage deformation on the stage of incomplete crystallization, it is possible to evaluate the effectiveness of the process. For the first time by the finite-element simulation set limit value of the relative degree of deformation of continuously rectangular billets during their two-stage deformation on partial crystallization of the metal. Was further developed understanding of the laws of correction "romboidity" of continuously billets during their initial deformation in box pass, it is possible to improve the technology of continuously rolling billets with a defect of form "romboidity" in order to reduce or eliminate it. Field of application is manufacture of high-quality rolling from continuous casting steel.