Investigation of the temperature factor on the formation of a strip surface micro-relief during warm rolling
DOI:
https://doi.org/10.37142/2076-2151/2022-1(51)141Keywords:
rolling, tempering, temperature, micro-relief, printability coefficient, experiment, indenter.Abstract
Kulik T. A. Investigation of the temperature factor on the formation of a strip surface micro-relief during warm rolling
The temperature is studied as a factor that affects the formation of the micro-relief of the strip, which was rolled with heat. Various schemes for heating the strip to the required temperature are considered. A mathematical model of the temperature distribution over the thickness of the strip and along the length of the deformation zone is obtained. The temperature distribution along the height and length of the deformation zone is not the same. Our studies have shown that the heating scheme is better when the heater is inside the roll. This is better because it gives a smaller temperature spread along the length of the deformation zone. That is, you can better use temperature as a factor. The roughness of the strip during warm rolling is influenced by several factors. If we consider the process with the final tempering, then one of the main factors is temperature. We studied how temperature affects the printability coefficient of the micro-relief from rolls to metal. Experiments were carried out to confirm the results. The experiment consisted in indentation a single indenter into a metal sample. Indenters of various shapes were used, similar to the shape of single micro-protrusions of the real relief of the work rolls. The sample was heated to different temperatures in the drying box, then the depth of its indentation was measured. Experimental studies have shown an almost linear dependence of the penetration depth on temperature, that is, the dependence of the printability coefficient on temperature. This form of dependence was observed for all forms of the indenter, although with different intensity. So, we can confidently say that the temperature factor can be used to control the parameters of the strip roughness that is needed. To do this, at the final stage of the technological chain of rolling, which is temper rolling, you can use the work rolls of the desired micro-relief, and the strip of the desired temperature.
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