Method for controlling strip-steel head and tail temperature
A technology for controlling the strip, head and tail, applied in the field of controlling the temperature of the head and tail of the strip steel, can solve the problems of temperature fluctuation, unqualified, and large performance fluctuations of the transition part of the weld, and achieve the effect of ensuring the product quality is qualified
Active Publication Date: 2010-11-24
BAOSHAN IRON & STEEL CO LTD +1
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Problems solved by technology
If the thickness of the front and rear steel coils changes, the temperature of the transition part of the weld must fluctuate, even exceeding the annealing temperature range required by the process, resulting in large fluctuations in the performance of the transition part or unqualified
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The invention discloses a method for controlling strip-steel head and tail temperature, comprising the following steps of: A. detecting positions of welded seams of strip-steels by a detector; B. calcThe invention discloses a method for controlling strip-steel head and tail temperature, comprising the following steps of: A. detecting positions of welded seams of strip-steels by a detector; B. calcrget strip temperature at the welded positions; E. according to the difference between the locus of the target strip temperature and the predicated strip temperature values, calculating a gas flthe target strip temperature at the welded positions; E. according to the difference between the locus of the target strip temperature and the predicated strip temperature values, calculating a gas flow compensation value; F. counting up the gas flow compensation value and a gas flow set value calculated by the model and transmitting the total value to a heating furnace meter; and G. controlling tow compensation value; F. counting up the gas flow compensation value and a gas flow set value calculated by the model and transmitting the total value to a heating furnace meter; and G. controlling the openness of a gas valve by the heating furnace meter through a loop.he openness of a gas valve by the heating furnace meter through a loop.ulating predicted strip temperature values of the front and the back strip-steels at a heating furnace outlet by a mathematical model to obtain a strip temperature variation between the front and theulating predicted strip temperature values of the front and the back strip-steels at a heating furnace outlet by a mathematical model to obtain a strip temperature variation between the front and theback strip-steels; C. taking the strip temperature variation into consideration and ascertaining target strip temperatures of the upper and the lower strip-steels at the positions of the welded seamsback strip-steels; C. taking the strip temperature variation into consideration and ascertaining target strip temperatures of the upper and the lower strip-steels at the positions of the welded seamsaccording to a principle that the predicated strip temperature values at the tail of the upper strip-steel coil and at the head of the lower strip-steel coil are not lower than a lowest annealing tempaccording to a principle that the predicated strip temperature values at the tail of the upper strip-steel coil and at the head of the lower strip-steel coil are not lower than a lowest annealing temperature required by the strip-steels; D. according to the obtained target strip temperatures, utilizing an empirical formula for the temperature-rise period of the heating furnace to fix the locus oferature required by the strip-steels; D. according to the obtained target strip temperatures, utilizing an empirical formula for the temperature-rise period of the heating furnace to fix the locus ofthe ta
Description
A Method of Controlling the Temperature of Strip Head and Tail technical field The invention relates to a method for controlling the temperature at the head and tail of a steel strip, in particular to a method for controlling the temperature at the head and tail of a steel strip used in a cold rolling continuous annealing production line. Background technique The general situation of the heating furnace of the continuous annealing unit is shown in Figure 1. It is heated by gas, and steel coils of different thicknesses and widths are continuously passed through the heating furnace by welding. Annealing treatment to meet the mechanical properties of the product. The control of the heating furnace of the continuous annealing unit is divided into furnace temperature control and belt temperature control. The furnace temperature control model aims to control the actual furnace temperature at the outlet of the heating furnace, and considers the influence of the temperature at t...
Claims
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IPC IPC(8): C22C1/00
Inventor 何建锋林莉军
Owner BAOSHAN IRON & STEEL CO LTD