Hot rolling reeling scroll defect control method

Abstract

The invention discloses a hot rolling reeling scroll defect control method, and relates to the field of hot rolling. The thickness of strip steel is set, the roll gap of a pinch roll is set, the stripsteel enters a reeling machine, the strip steel enters the roll gap between a reeling assisting roll and a core bar in the reeling machine till the core bar is expanded, and tension is established between the core bar and a finish rolling rack F6. The values of position sensors of pressing hydraulic cylinders on the two sides are adopted for reference, the two-side pressing actual deviation is calculated, a computer automatically gives the OS servo valve signals according to the actual deviation value, the hydraulic cylinders are elevated or the computer automatically gives DS servo valve signals, and the hydraulic cylinders are elevated. Through control over gaps of the pinch roll, actually, the actual deviation on the two sides is accurately obtained under the pressure control situation; through the deviation feedback value, the deviation is automatically or manually adjusted for ensuring the relative horizontal closed-loop control process of the pinch roll, the reeling machine is more automatic and stable in the running process, the artificial participation steps are reduced, and the labor cost is reduced.

Description

technical field [0001] The invention relates to the technical field of hot rolling, in particular to a method for controlling coil shape defects of hot rolling coils. Background technique [0002] The problem of wrong edge at the tail of the coiler in the 1700 hot rolling production line has been appearing in stages, affecting the appearance of the finished product, the quality index is unstable, and the rolling thickness is less than 4.5mm. There is a close relationship between the deviation of the pinch roller. The greater the dimension deviation on both sides of the pinch roller, the worse the coil shape of the tail of the steel coil. Therefore, the installation accuracy of the pinch roller is extremely high. At present, the level of the pinch roller under the production line is controlled at about 0.05mm The pinch roll adopts the convex roll type. Since the roll gap set by the pinch roll is smaller than the thickness of the finished strip, the surface of the upper and lo...

AI Technical Summary

Problems solved by technology

[0002] The problem of wrong edge at the tail of the coiler in the 1700 hot rolling production line has been appearing in stages, affecting the appearance of the finished product, the quality index is unstable, and the rolling thickness is less than 4.5mm. There is a close relationship between the deviation of the pinch roller. The greater the dimension deviation on both sides of the pinch roller, the worse the coil shape of the tail of the steel coil. Therefore, the installation accuracy of the pinch roller is extremely high. At present, the level of the pinch roller under the production line is controlled at about 0.05mm The pinch roll adopts the convex roll type. Since the roll gap set by the pinch roll is smaller than the thickness of the finished strip, the surface of the upper and lower pinch rolls will be worn after a period of use. Due to the different product specifications, the roll surface of the pinch roll The wear of the pinch roller cannot be absolutely uniform. At this time, there is a deviation on the actual two sides of the pinch, especially the 3# and 4# pinch rollers. volume control

[0003] The main problem of this process is that there is no absolute level of the current pinch roll surface. Although the pressure on both sides is the same, the actual roll gap will eventually have deviations. When the gap deviation is large, the strip will swim to the larger side of the roll gap. Through comparison, it is found that when the thin plate is produced, the greater the pressure of the pinch roll, the more serious the lateral movement of the strip, resulting in misalignment of the tail of the strip. edge, resulting in finishing or subjugation

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