Sheet coiling temperature control method in big-speed-reduction rolling of hot-rolled strip steel

Abstract

The invention discloses a sheet coiling temperature control method in big-speed-reduction rolling of hot-rolled strip steel. The method comprises the steps of: inputting such data as the thickness of the strip steel into a laminar cooling model module of a laminar cooling process machine; and judging if a finish rolling steel casting speed difference is not smaller than 3 M / S and the steel casting time point is reached, if not, increasing the cooling water quantity through opening a concentrated distribution control valve of a finish rolling basic automation computer, and enabling the actual temperature of the strip steel to approach a target value through adjusting the feedback water quantity, and if so, calculating the tail heating length of the strip steel according to a rolled length before the finish rolling speed-reduction rolling through the laminar cooling model module, raising the tail temperature, re-calculating the valve opening magnitude, sending a signal to the finish rolling basic automation computer to perform the valve reducing treatment so as to reduce the tail cooling water quantity, and enabling the actual temperature of the strip steel to approach the target value through adjusting the feedback water quantity. The method can prevent the tail coiling temperature of the thin-specification strip steel from exceeding the control range in the big-speed-reduction rolling.

Description

technical field [0001] The invention relates to a laminar flow cooling control method for a hot strip steel production line, in particular to a method for controlling the coiling temperature at the tail of a hot-rolled thin strip steel. Background technique [0002] The prior art concerning the temperature control of the external hot tandem mill and the tail coiling of the sheet has the following published patent applications: [0003] 1. The method disclosed in the invention patent application No. CN200810032041.3 titled "Method for Producing Metal Titanium Plates Using Medium and Broadband Hot Rolling Mills" uses a cast steel plate (CSP) production line to produce non-ferrous metal titanium plates (coils), By controlling the roll gap width, reduction rate, rolling force and rolling mill (system) speed of each stand of the hot rolling unit, the rolling speed of the titanium plate rolled out by the last stand of the hot rolling unit is controlled at 4.0- 8.0m / s, the titaniu...

AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to provide a method for controlling the coiling temperature of the hot-rolled strip during large-speed rolling, to solve the problem that the actual coiling temperature at the end of the thin plate is low and the coiling temperature quality loss and poor precision are easy to occur, so as to solve the problem of Avoiding Thin Gauge Strip Tail Coil Temperature Out of Control Range When Using Large Reduced Speed ​​Rolling

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