Wide and thick plate temperature monitoring method for grid exponential distribution

Abstract

The invention provides a wide and thick plate temperature monitoring method for grid exponential distribution, and belongs to the technical field of automatic control on wide and thick plate rolling. The problem that the on-line operation time is too long caused by the fact that the grid division in a thickness direction is extremely fine when a thick gauge steel plate is rolled under the condition of large temperature gradient is solved. In a differential temperature rolling process, grid division is carried out on the steel plate from the surface to the core part of the steel plate along the thickness direction by adopting a manner that the log Kow of the thickness is equal and the true value of the thickness is in exponential distribution, so as to form a distribution form that grids at the surface are relatively fine and grids at the core part are relatively wide, thus improving the on-line operation efficiency of a temperature monitoring calculating process, and reducing the on-line operation time; compared with a traditional difference method of equidistant grid division, the temperature control accuracy can be improved to 6 to 8 DEG C from the traditional 10 to 15 DEG C by the method; the method can be widely popularized to wide and thick plate rolling plants, so as to improve the temperature control accuracy of a wide and thick plate product.

Description

technical field [0001] The invention belongs to the technical field of automatic control of wide and thick plate rolling, and in particular relates to a method for monitoring the temperature of wide and thick plate with grid index distribution. Background technique [0002] Wide and thick plates are widely used in ships, bridges, boilers, containers, petrochemicals, engineering machinery and national defense construction. Precise control of rolling temperature and final cooling temperature. However, for thick-gauge steel plates, the rolling deformation often cannot penetrate into the core, so that the quality of the core of thick-gauge products cannot be guaranteed. Therefore, in order to improve the mechanical properties of the steel plate core, differential temperature rolling technology is used for rolling. figure 1 As shown, this method produces a large deformation resistance gradient along the thickness direction of the steel plate through side rolling and cooling, for...

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Problems solved by technology

[0003] In the production process of wide and thick plates, the temperature model is usually calculated by the finite difference method. During the differential temperature rolling process, a large temperature gradient will be generated in the thickness direction of the steel plate. In order to ensure the calculation accuracy of the temperature distribution in the thickness direction, it is often used The method is to greatly increase the grid number of the finite difference method, but because there are a large number of iterative calculations in the calculation process of the rolling schedule of the plate, the increase of the grid number will greatly increase the online calculation of the rolling schedule calculation program time, unable to meet the real-time requirements of online control for wide and thick plates

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