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The article concerns preliminary research involving the development of a flow model for a material consisting of a mixture of clay (70 %), quartz sand (10 %) and ceramic flour (20 %) in an upsetting test in order to determine the course of plasticizing stress as a function of actual strain. This material constitutes the mass for the production of ceramic roof tiles and, at the beginning of the process, it is pressed through forming tools, then cut to the appropriate size, stamped and dried. It is difficult to find information in the literature on the subject of numerical modelling of the process of extruding a strip of clay, especially in terms of the operation of forming tools, which wear out mainly as a result of intense friction of the pressed material, causing abrasive and tribological wear of the tools. Therefore, first, the authors conducted upsetting tests to determine the flow characteristics, and then attempted to develop a material model for the clay mixture. The results of the conducted R&D work, after many verifications and modifications, allowed for the construction of a model based on the Hansel-Spittel formula along with the identification of the parameters and coefficients appearing in the equation. The final stage of the work was the development of a numerical model for the preliminary analysis of the formation of the squeezed band.
Keywords: ceramic roof tiles; band extrusion; clay flow curves; material modelling© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.