Rolling reduction acquisition method and device for upper-row rollers of roller-type stretch bend straightening machine

Abstract

The invention discloses a rolling reduction acquisition method and device for upper-row rollers of a roller-type stretch bend straightening machine. The method is characterized in that relational expressions between residual strains of interlayers of strip steel during stretch bending and the relative bending curvatures of the strip steel at all straightening rollers, as well as between the residual strains of the interlayers of the strip steel during stretch bending and the relative tensile stresses of strip steel at all the straightening rollers are established through theoretical analysis; then the residual strains of the strip steel at all the straightening rollers are calculated according to given roller-type stretch bend straightening process parameters, and accumulated to work out the ductility of the strip steel, and the calculated ductility values and the actual ductility values are compared to realize optimal calculation of the rolling reduction of upper-row rollers of the roller-type stretch bend straightening machine. The rolling reduction acquisition method is definite and clear in principle, and simple and quick in calculation; the calculated results and the field measured values are identical; the rolling reduction of the upper-row rollers can be accurately matched with the speed difference between an inlet tension roller set and an outlet tension roller set, so that the ductility of the strip steel, which can be provided by the roller-type stretch bend straightening machine, conforms to the actual ductility, and accordingly, the strip steel is prevented from sliding.

Description

technical field [0001] The invention relates to metallurgical technology, in particular to a method and a device for obtaining the rolling reduction of an upper row of a roller-type tension-bending straightening machine. Background technique [0002] The roll-type stretch bending straightening machine unit is the key equipment connecting the hot rolling and cold rolling processes, and has the dual functions of strip straightening and scale breaking. The unit is mainly composed of two sets of tension rollers and two rows of straightening rollers arranged alternately in the middle. The lower row of rollers is arranged horizontally and its position is fixed, and the upper row of rollers can be tilted and adjusted as a whole. figure 1 It is a schematic diagram of a seventeen-roller stretch bending straightening machine unit, such as figure 1 As shown, the strip passes through the entrance tension roller group 18, 17 straightening rollers up and down (wherein there are 8 upper r...

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Problems solved by technology

However, there is no convenient and practical online calculation model for the elongation of the roller-type tension leveling strip at present, which makes it often necessary to rely on experience to determine the reduction value of the upper row of straightening rollers. The resulting problem is: in the roller-type In the actual application of the stretch bending straightening machine unit, the reduction of the upper row of rollers and the speed difference between the entrance tension roller group and the exit tension roller group cannot be correctly matched, so that the strip steel will slip, causing the surface of the strip steel to be scratched and the shape of the strip steel plate to deteriorate

[0004] In addition, the roll-type tension leveling machine can not take into account the functions of strip straightening and scale breaking in practical applications. The problem often encountered is that the strip scale is very effective, but after roll leveling The shape of the strip is poor

This is because in order to achieve a good scale-breaking effect, a relatively large strip elongation (generally greater than 1%) is required to achieve it, and the elongation needs to be distributed to each straightening roll. If the reduction of the upper row of rolls is set If it is unreasonable, the straightening rollers will not be able to adapt to the deformation of the strip steel, which is not conducive to improving the shape of the strip steel plate, and may even deteriorate the shape of the strip steel plate

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