Rapid shutdown control method for thin plate in vertical continuous annealing unit
A control method and unit technology, applied in heat treatment process control, manufacturing tools, furnaces, etc., can solve problems such as high reverse temperature in the furnace, large span of deceleration interval, and rise in strip temperature, so as to avoid uneven stress , The control process is simple, and the effect of reducing the temperature difference of the board
Active Publication Date: 2019-12-10
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology
However, in the actual production process, because the temperature in the annealing furnace has the characteristics of thermal inertia, the speed reduction will cause the temperature of the strip steel in the furnace to rise. It will cause the unit to break
[0004] After retrieval, the Chinese invention with the application number 201510004294.X discloses a control method for preventing the thin strip steel from buckling when the continuous annealing furnace is shut down. It is characterized in that when the production line breaks down, the...
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Embodiment 1
[0024] Example 1: see Figure 1-Figure 4 , a vertical continuous annealing unit thin plate rapid shutdown control method, the control method comprises the following steps:
[0025] S1, the annealing furnace is switched to the cooling mode, and its temperature is controlled;
[0026] S2, reduce unit speed (speed control);
[0027] S3, reduce unit tension (tension control);
[0028] S4. When the unit speed drops below 400mpm, press the stop button;
[0029] S5. After the unit is shut down, the annealing furnace section is unloaded, and the strip steel is conveyed to the annealing furnace to ensure that the strip steel before and after the annealing furnace is slack.
[0030] The specific operation of the temperature control in the step S1 is as follows: when an abnormal situation occurs in the production, the unit needs to slow down. If the running speed of the strip is directly reduced, the temperature of the strip will rise locally. Due to the high temperature of the anneal...
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Abstract
The invention relates to a rapid shutdown control method for a thin plate in a vertical continuous annealing unit. The control method includes the following steps of S1, switching an annealing furnaceto a cooling mode, and controlling the temperature of the annealing furnace; S2, reducing the speed of the unit (speed control); S3, reducing the tension of the unit (tension control); S4, when the unit speed is reduced to be below 400 mpm, pressing down a stop button; S5, after the unit is stopped, eliminating the tension of strip steel in an annealing furnace section and conveying the strip steel into annealing furnace so as to ensure the slackness of the strip steel before entering the annealing furnace and after exiting from the annealing furnace. According to the scheme, through reasonable adjustment of the speed and tension of the unit, the fluctuation of the tension in the furnace is reduced while the stable speed reduction of the unit is ensured, and the problem that the strip steel is stressed unevenly in the width direction under the action of large tension and thus generates ridge buckles is solved by adopting small tension control under the condition that stable running and non-deviation of the strip steel in the speed reduction process are ensured.
Description
technical field [0001] The invention relates to a method for controlling rapid shutdown of thin plates in a vertical continuous annealing unit, in particular to a control method for rapid shutdown of cold-rolled thin strip steel in the process of stable operation in a vertical continuous annealing furnace. Strip steel is in the field of vertical continuous annealing control technology. Background technique [0002] Iron and steel enterprises mostly use continuous annealing units to recrystallize and anneal the work-hardened strip steel after cold rolling to improve its microstructure, thereby improving the plasticity and stamping formability of the strip steel. Since the high-speed thin plate continuous annealing unit has the characteristics of fast strip running speed (600mpm-700mpm), thin strip steel specification (0.17mm-0.25mm), high furnace temperature (up to 840°C), etc., it is very important for the stability of equipment status and process Sex is very demanding. ...
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Login to view more IPC IPC(8): C21D9/50C21D11/00C21D1/26
CPCC21D9/50C21D11/00C21D1/26
Inventor 王涛李少朋
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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