Hot rolling and finish rolling multi-level threading speed control method
A technology of strip threading speed and control method, which is applied in the direction of rolling mill control device, metal rolling, metal rolling, etc., and can solve problems such as hidden dangers of steel scrap
Active Publication Date: 2015-04-22
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology
However, increasing the strip threading speed is also a problem that cannot be ignored for the hidden danger of scrap steel brought about by the normal production of the rolling line.
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Embodiment 1
[0023] For the hot rolling and finishing rolling multi-stage threading speed control of this embodiment, refer to figure 1 , taking the 7-stand (F1-F7) finishing mill equipped with finish rolling temperature and strip end position monitoring, the rolled strip thickness is 1.80mm, and the target finish rolling temperature is 880±20°C as an example, the longitudinal The coordinate V is the belt threading speed, and the abscissa F is the rack. The specific steps are as follows:
[0024] (1) When rolling the first piece of strip steel, the initial strip threading speeds of the strip steel in the 7 racks are determined to be 1.22m / s, 2.30m / s, 3.59m / s, 5.36m / s which increase linearly .
[0025] 1.22*16.29=2.30*8.60=3.59*5.52=5.36*3.70=7.49*2.64=9.62*2.06=11.00*1.80=C, so the principle of equal flow per second is satisfied.
[0026] (2) When the strip head leaves the last stand F7, the instrument detects that the average actual temperature of the strip head is 852°C, which is lower...
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The invention relates to a hot rolling and finish rolling multi-level threading speed control method, and belongs to the technical field of steel rolling control. According to the hot rolling and finish rolling multi-level threading speed control method, in a group of steel rolling mill provided with finish rolling temperature and strip steel end location monitoring, the initial threading speed of each corresponding machine frame in a group of machine frames is determined as a matter of routine; when the monitored finish rolling temperature is lower than a target temperature, the speed of next time threading of a first machine frame is improved according to a scheduled speed-up ratio; if the monitored finish rolling temperature is still lower than the target temperature, the threading speed of a next machine frame is improved according to the scheduled speed-up ratio until before the middle machine frame; if the monitored finish rolling temperature is still lower than the target temperature, the second step is repeated; and after the threading, a strip steel end is output from a speed-up machine frame, enters in front of a bite steel of a next machine frame with the initial threading speed, and controls all speed-up machine frames to recover into original corresponding initial threading speeds. By means of the method to the maximum extent, the threading speed of the current machine frame can be improved appropriately to achieve the purpose that the finish rolling temperature is kept not to lower than a threshold value.
Description
technical field [0001] The invention relates to a steel rolling speed control method, in particular to a hot rolling finish rolling multi-stage strip threading speed control method, which belongs to the technical field of steel rolling control. Background technique [0002] In the hot rolling production process, the control of the final rolling temperature is an important key point, because the deviation between the actual temperature of the strip and the target temperature directly affects the structure and performance of the strip. The control of the actual finish rolling temperature is related to factors such as rolling speed (including strip threading speed, rolling speed, and steel throwing speed), cooling water between stands, intermediate billet thickness, actual temperature of incoming materials, and target temperature setting. Under the same conditions, it is easy to control the finishing temperature of strip steel with thicker finished product specifications (>2...
Claims
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IPC IPC(8): B21B37/00
Inventor 卞皓谢向群夏小明凌爱兵
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD