Method for improving coil shape quality of hot rolled strip steel

Abstract

The invention relates to a method for improving the coil shape quality of hot rolled strip steel. The method comprises the steps of after the head part of a coiling machine bites steel, delaying 21-36seconds, and starting to set a stopped state of the tail part; after the tail part throws steel, when the tail part of the strip steel leaving a pinch roll is detected, enabling the tail part to automatically stop and start to control, and enabling a coiling block to stop according to a retardation curve; when the tail part of the strip steel enters a definite range from a starting stop position,determining a tail part stop position according to a pair tail conversion timing sequence; and after normal coiling is completed, adopting the appropriate uncoiling delaying time in the coiling machine. The method has the advantages that after the coiling machine bites steel at the heat part of the strip steel, the pair tail position pre-judgment of the tail part and the calculation and judgmentof automatic rotation angle after aligning delaying are introduced, the final uncoiling position can be selectively determined according to operational requirements, and therefore the coil shape quality of the hot rolled strip steel is improved, and the chance of flat coiling due to wear of the coiling block, insufficient tension, insufficient cooling water capacity and large roll-gap deviation ofa wrapper roll is reduced.

Description

Technical field [0001] The invention relates to a method for improving the coil shape quality of hot rolled strip steel. Background technique [0002] Advanced high-strength steel sheets produced by hot rolling and hot-rolled steel sheets for special purposes require high impact performance, crush strength, fatigue performance, cold bending performance, etc.; in addition to the above-mentioned good mechanical properties and forming properties, It should also have good welding performance, spot weldability, corrosion resistance, anti-aging stability, and performance uniformity and stability, and good damping performance. However, these steels have a common problem in the production process: flat coils. Typical varieties are: automotive steel, weathering steel, military steel, cutting tool steel, and duplex steel. In the production process, due to the unwinding procedure of the coiler, the steel plate reel with a thickness of less than 6 mm has a reversal function when unloading. ...

AI Technical Summary

Problems solved by technology

In order to ensure that the reel is tight enough when coiling steel, it is necessary that the secondary expansion position of the reel with load is obviously smaller than the position without load, but due to the limitation of the equipment structure, it is impossible to increase the secondary expansion stroke directly. accomplish

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