Technique for continuously and flatly rolling welding seams of cold-rolled sheets

Abstract

The invention relates to a technique for continuously and flatly rolling welding seams of cold-rolled sheets. A computer controls a hydraulic cylinder of a flat roll and front and back tension rolls of a leveler, adjusts rolling force and strip steel running speed, and adopts a control method for firstly slowing down the speed and then reducing the rolling force, and firstly recovering the rollingforce and then recovering the speed to realize the continuous and flat rolling of the welding seams of the cold-rolled sheets. The technique does not influence the production of previous and subsequent procedures, and eliminates punch marks of the welding seams on the flat roll, so the punch mark defects of the steel sheets are avoided, the surface quality of the steel sheets is improved, and a value of 2.6 million Yuan can be saved each year. The rolling force is reduced, so power consumption is reduced and energy is saved; and the technique dose not need increasing any equipment and investment, is simple and feasible, and has quick response.

Description

technical field [0001] The invention belongs to the field of steel rolling technology, and in particular relates to a control method when cold-rolled strip steel rolls weld seams on a continuous tempering machine. Background technique [0002] The tempering mill of the continuous annealing unit is one of the main equipments to improve the performance and surface quality of cold-rolled sheets, and it is in an uninterrupted continuous working mode in the continuous annealing production line. The main function of the tempering machine is to control the strip shape, surface roughness and elongation index, and the elongation is the most important control index. In the state of continuous production, the head and tail of the steel strip entering the continuous annealing furnace are welded together. The weld seam formed by the lap welding method will appear a certain super-thick phenomenon after welding and rolling, and the super-thick part will pass through the flat When the whol...

AI Technical Summary

Problems solved by technology

The method of opening the roll gap of the leveling roller, because the roll gap is opened and then closed, it lasts for a long time and there is a section of strip steel that is not leveled, and there is a performance problem in the unleveled part; and the operation is more complicated, frequent opening and closing of the roll gap, easy to The equipment causes repeated impacts, causing fatigue of the components

In the method of passing through the normal rolling state, since the hardness of the weld is higher than that of the base part of the steel plate after annealing, it is very easy to leave weld marks on the roll, and then pressed to the surface of the steel plate after smooth rolling, every time Every month, the steel plate that cannot be delivered to the SG7 grade has a weight of more than 470 tons of printing defects, which not only affects the surface quality of the steel plate, but also causes great economic losses

[0004] After retrieving domestic and foreign patent documents and books and periodicals, no related reports were found to solve this problem