Method for comprehensively setting clamp force of pinch roll on hot rolling reeling machine

Abstract

The invention relates to a method for comprehensively setting clamp force of a pinch roll on a hot rolling reeling machine. The method is characterized by comprising the following steps executed by a computer: (a) collecting equipment and technological parameters of the hot rolling reeling machine; (b) collecting varieties and specifications of strip steels which are to be treated by the pinch roll, and technological parameters of treating the strip steels; (c) collecting calculating process parameters of the clamp force of the pinch roll; (d) setting main process parameters; (e) calculating a frictional coefficient [mu] between a roll surface and the strip steel when the pinch roll is working; (f) calculating a minimum clamp force P11 which ensures the strip steel can be fed in, calculating clamp forces P12 and P23; (g) calculating a clamp force Py of the pinch roll in a biting phase; (h) calculating a clamp force Pz of the pinch roll in a tension establishing phase. The advantage of the method is that through reasonable setting the clamp force of the pinch roll, the occurrence probabilities of insufficient feed-in, slip, surface scratches of the strip steel and guide plates, surface injuries of the strip steel, and other defects are reduced to the most extent, and a normal operation of the pinch roll is guaranteed.

Description

technical field [0001] The invention belongs to the field of computer control of hot-rolling coilers in the metallurgical industry, and relates to a method for controlling the coiling quality of steel coils, in particular to a method for comprehensively setting the clamping force of pinch rolls suitable for hot-rolling coilers. Background technique [0002] The determination of the clamping force of the pinch rolls in the coiling process of hot rolling has an important influence on the coiling quality. attached figure 1 Schematic diagram of the working principle of the pinch roller. After the strip 1 comes out of the hot-rolling finishing unit 2, it passes through the laminar flow cooling system 3 under the action of the output roller table 4, and then enters the pinch roll group 5 composed of the upper pinch roll 7 and the lower pinch roll 8, The head of the strip 1 is pulled and clamped by the pinch roller group 5, and it is sent between the reel 12 and the winding-assis...

AI Technical Summary

Problems solved by technology

In fact, it is unscientific to use this method to set the clamping force of the pinch roller, because the clamping force set by this method is only the ideal minimum limit value for the normal operation of the pinch roller, without any margin , if common problems such as strip thickness fluctuations and performance fluctuations occur during production, it may cause the pinch rollers to fail to work normally

At the same time, the clamping force of the pinch roller is not as high as possible. If the clamping force is too large, it may cause excessive local contact stress between the pinch roller and the strip, exceeding the allowable contact stress of the strip, which is easy Cause local scratches and scratches on the surface of the strip

In particular, the following four types of problems were not considered in the setting process of the clamping force of the pinch roller in the past: (1) During the working process of the pinch roller, with the increase of the mileage of the pinch roller passing the steel, the pinch roller The wear of the roller causes the clamping force of the pinch roller to be unevenly distributed along the lateral direction, which may cause the problem of excessive local contact pressure of the strip; (2) During the working process of the pinch roller, as the pinch roller passes the steel kilometer increase, the surface roughness of the pinch roller decreases, resulting in a slow decrease in the coefficient of friction between the pinch roller and the strip, and if the original technology is used to set the clamping force, it may lead to problems such as insufficient feed and slipping; (3) During the working process of the pinch roller, due to the convexity of the cross-sectional shape of the strip, the clamping force of the pinch roller is unevenly distributed along the lateral direction, resulting in the problem of excessive local contact pressure on the surface of the strip; (4) due to the The deflection problem itself causes the clamping force of the pinch roller to distribute unevenly along the transverse direction, resulting in excessive local contact pressure of the strip and the problem of crushing the strip

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