Mathematical modeling of the process of pinch rolling relatively thin sheets and strips taking into account the real temperatures of the process

Abstract

Kulik T. A. Mathematical modeling of the process of pinch rolling relatively thin sheets and strips taking into account the real temperatures of the process // Material working by pressure.  – 2019. – № 2 (49). - Р. 71-75.

The purpose of this article is to improve the quality of relatively thin metal subjected to warm pinch rolling, by clarifying and expanding the scope of information provided by the results of mathematical modeling of the stress-strain state and temperature regimes of the process. The method of calculation of resistance of metals and alloys at their warm deformation providing more complete and correct accounting of influence of temperature is specified. The obtained mathematical model for pinch rolling allows us to take into account the real nature of the residual stress distributions over the width of the strip subjected to training and, thus, to predict one of the main indicators of the quality of the finished metal. Thus, it is shown that the temperature increase leads to an increase in the levels of residual compression stresses in the surface layers. In this case, the maximum intensity of these quantitative changes takes place in the case of heat energy supply directly to the deformation center through preheated working rolls. The possibility of additional increase of residual compression stress on the surface of the relatively thin strips, sheets and strip, makes effective use of warm pinch rolling in a pre-heated work rolls not only from the point of view of reducing the power parameters, but also from the point of view of improvement of consumer properties of the preparations used in the future during realization of different technological schemes for sheet metal forming.