An Online Calculation Method of Short Stroke Curve Parameters in Hot Continuous Rough Rolling

Abstract

The invention discloses an on-line computation method of hot continuous rolling rough rolling short stroke curve parameters and belongs to the technical field of hot rolled strip automatic control. According to the on-line computation method of the hot continuous rolling rough rolling short stroke curve parameters, a multi-step broken-line mode is adopted, neuron network is adopted to forecast width deviation which is generated when a rolled piece is through current pass forward direction rolling and next pass reversed direction rolling (if a current pass is not the last pass) under the condition that the head and the end of the rolled piece are not under short stroke control, wherein head and end parameters of the rolled piece are exchanged in the pass capable of reverse rolling, then short stroke curve parameters of a vertical roll rolling pass is confirmed according to deviation of the entrance width of the head and the end of the rolled piece and the forecast rolled width deviation. The on-line computation method of the hot continuous rolling rough rolling short stroke curve parameters is good in adaptability, high in accuracy, convenient to debug and maintain and beneficial for improving a yield rate of hot continuous rolling.

Description

Technical field: [0001] The invention belongs to the technical field of automatic control of hot-rolled strip steel, and particularly relates to a model method in the control process of the head and tail width of hot-rolled strip steel. Background technique: [0002] In the process of hot continuous rolling and rough rolling, vertical and horizontal rolling mills are set up, and the slab is rolled into the required width and thickness of the intermediate slab through multi-pass reversible and reciprocating rolling, and then it is rolled into hot rolling by the finishing mill. finished product. The vertical rolling mill is only used in the forward rolling pass, and the required intermediate blank width can be obtained by distributing the appropriate amount of lateral pressure when the schedule is set. However, during vertical roll rolling, the deformation process of the head and tail of the rolling piece is in an unstable state, resulting in a loss of width in the shape of t...

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Problems solved by technology

The patent "A method for auxiliary adjustment of head and tail width control of hot strip steel" (Chinese patent application number: 200910088150.1) only mentions the use of offline simulation tools to manually adjust and optimize the short-stroke curve parameter table, and does not involve online dynamic calculation of parameters Method; Document 1 (Study on short stroke control curve of rough rolling based on finite element and optimization, Chinese Journal of Computational Mechanics, V29, No4) mentions the method of optimizing short stroke curve through finite element analysis, which cannot realize online operation due to large amount of calculation. And the impact of multi-pass rolling back and forth is not considered; Document 2 (Summary of Short-stroke Intelligent Control of Hot-Rolled Strip Steel, Shandong Metallurgy, V31, No6) mentions that various artificial intelligence methods are used to optimize from a large number of actual production data samples. The method of short-stroke curve parameters does not involve the evolution process and compensation strategy of the width loss at the head and tail of the rolled piece

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