The Method of Improving the Rolling Quality of Strip Tail

Abstract

The invention provides a method for improving strip steel tail part coiling quality. The method is based on coiling equipment arranged behind a hot rolling unit, and the coiling equipment comprises afirst coiling machine and a second coiling machine which are arranged in sequence along the running direction of strip steel, and further comprises a pair of first side guide plates and a pair of second side guide plates. The method comprises the steps that during coiling of the strip steel by the second coiling machine, when the head part of the strip steel reaches an inlet of a pinch roller of the second coiling machine, the pair of second side guide plates are folded to clamp the strip steel; and before the tail part of the strip steel is transported out of a tail frame of a finish rollingunit, the pair of first side guide plates are folded to clamp the strip steel. According to the method for improving the strip steel tail part coiling quality, the side guide plates of the upstream coiling machines are used for clamping the strip steel, and two or more side guide plates are adopted to clamp the strip steel at the same time, so that the friction force between the side guide platesand the edge of the strip steel are improved, the tail part of the strip steel is ensured to be tightened, and the coiling quality of the tail part of the strip steel is improved.

Description

technical field [0001] The invention relates to a method for improving the coil shape quality of the strip steel tail in the hot rolling process. Background technique [0002] The coiler is an important equipment of the hot rolling production line, which is used to coil the hot rolled steel strip into steel coils. The coiler is located behind the finish rolling unit and is the last process of the hot rolling production line. see figure 1 with 2 , the strip 1 is transported from the finish rolling unit to the coiler unit by the roller table 3, and then enters the pinch roller 51 through the centering of the side guide plate 41. The main function of the pinch roller is to apply a certain clamping force to the strip steel at the head biting stage, and at the same time implement the first bending deformation; to apply a stable tension to the strip steel at the tail coiling stage to ensure good Roll quality. Three roll-helping rollers 6 help to bend the steel strip and make ...

AI Technical Summary

Problems solved by technology

When the loose strip steel is coiled, it is easy to produce overflow edge, fold edge and edge damage defects

[0009] The existing technology adopts the method of roller table lag to solve this problem: when the tail of the strip is thrown out by the last stand 21 of the finishing mill, the speed of the roller table 3 is reduced to make it lower than the running speed of the strip

[0011] 1) The effect is poor when coiling thin strip steel (such as strip steel with a thickness less than or equal to 4mm): reduce the speed of the roller table to make it lower than the operating speed of the strip steel, and the effect is better when coiling thick strip steel, but Thin strip steel has light weight, the friction force between the lower surface of the strip steel and the roller table is small, the tail of the strip steel cannot be tightened, it is still in a loose and unstable state, and quality defects cannot be avoided

[0012] 2) Affect the quality of the lower surface of the strip: the speed of the roller table is lower than the speed of the strip, and there is inevitably friction between the lower surface of the strip and the roller surface, which affects the surface quality

In order to tension the thin strip, the speed difference between the roller table and the strip must be increased, but this increases the possibility of causing surface defects

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