A Method for Determining Temperature Field and Thermal Expansion of Working Rolls in Cold Rolling Mill

Abstract

The invention provides a method for determining the temperature field and thermal expansion of a cold rolling mill working roll. The method comprises the steps that a working roll temperature field theoretical analysis model is set up according to cold rolling technological conditions and a working roll heat transfer mechanism, a finite difference method is adopted to discretize the theoretical model so as to obtain a discretization model for calculating the working roll temperature field, the model is then calculated, and the internal temperature distribution of the working roll and the thermal expansion of the working roll are obtained. By the method, the heat transfer boundary conditions and heat flow density of the working roll can be accurately determined, and accurate temperature field parameters and thermal expansion parameters of the working roll can be provided for cold-rolled sheet shape control parameter regulation and rolling gap setting.

Description

technical field [0001] The invention relates to the field of metallurgical automation, in particular to a method for determining the temperature field and thermal expansion of work rolls of a cold rolling mill. Background technique [0002] In the cold rolling production process, the temperature field and thermal expansion of the work rolls directly affect the shape quality of the finished strip, and affect the original roll shape of the work rolls, roll change cycle, roll gap setting, roll bending, roll tilt, and segmental cooling. The regulation produced by the isoform control plays an important role. [0003] During the rolling process, when the work roll is rotating, the surface of the roll is in contact with the strip steel. Under the joint action of the plastic deformation work of the strip steel and frictional heat, the temperature of the roll surface rises rapidly. At the same time, the work roll contacts with air, emulsion The convective heat exchange and the heat ...

AI Technical Summary

Problems solved by technology

However, considering that the rotation period of the roll is relatively small compared with the response time of thermal expansion to the change of rolling conditions, the temperature change of the work roll in the circumferential direction is ignored, and the temperature field is described by simplifying it into a two-dimensional unsteady system

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