Method for controlling opening degree of rough rolling edger during rolling of tapered slab

Abstract

The invention relates to the field of hot-rolled band steel production control, in particular to a method for controlling the opening degree of a rough rolling edger during the rolling of a tapered slab. A method for controlling the opening degree of a rough rolling edger during the rolling of a tapered slab includes the following steps: step 1 of dividing a slab into three sections, respectively: a head parallel section, a middle oblique section and an end parallel section, with the width of the head parallel section being larger than that of the end parallel section; step 2 of reading the original data of the slab; step 3 of determining the shape equation of the slab according to the original data of the slab; step 4 of selecting a plurality of characteristic points on the shaft of the slab at equal intervals, and obtaining the coordinates of the characteristic points by calculation; and step 5 of setting various parameters required by this rolling procedure according to the obtained coordinates of the characteristic points of the slab. In the invention, by accurately describing and defining the shape of the tapered slab, and precisely calculating the set values of the opening degree of the edger during the process in which tapered slabs in various shapes pass through the edger, the products rolled from the tapered slabs have no difference with products rolled from normal slabs in terms of quality precision.

Description

technical field [0001] The invention relates to the field of production control of hot-rolled strip steel, in particular to a method for controlling the opening degree of a rough-rolling vertical roll mill when rolling a tapered slab. Background technique [0002] The tapered billet is also called the width-adjusting billet, which is the excessive billet produced when the slab continuous casting machine casts two kinds of slabs with different widths. The width difference varies due to the change in width before and after each casting, and there is no rule to follow. The existing hot-rolled rough-rolling vertical roll mills are all controlled by a fixed opening. The process control system and the basic automation system can only control the width of the rectangular slab with the same width at both ends. The mechanism of hot-rolled conical slab control is to use the tail Short stroke sLt control function. By advancing the control position of the short stroke sLt of the tail ...

AI Technical Summary

Problems solved by technology

The specific method is that when the E1 and E2 vertical rollers are setting the short stroke trajectory of the forward pass, the setting of the short stroke sLh at the head remains the same; but the setting of the short stroke sLt at the tail is changed to the long stroke trajectory setting That is, the opening degree of the vertical roller at the tail (roll gap) setting is the same as that of the short stroke sLt at the tail, but the length of the control is lengthened, and the starting point of the long stroke control at the tail is the short stroke sLh at the head After the end point delay of 200ms, that is to say, the short stroke of the head and the long stroke of the tail are connected with each other. This control method can solve the rolling work of the standard T-shaped plate, but when encountering the segmented T-shaped plate shape , the effect of the rolled slab is not good, so a new method for controlling the opening of the rough vertical roll mill is needed

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