Control method for producing conical plate blank using side compression machine of fixed width plate blank

Abstract

The invention relates to a control method for producing hot rolling strip steel, particularly to an effective control method that a tapered plate blank (a transitional blank of continuous casting) is rolled to form a near rectangular plate blank through a horizontal rolling mill after being subjected to side compression through reasonably changing the openness of a side press machine with a fixed width, thereby improving the width control precision of the tapered plate blank produced by a hot rolling machine and reducing the width quality loss. In the invention, through the accurate description and the definition to the shape of the tapered blank, a dog-bone formed by the different amount of side compression at each point of the tapered blank and the width stretching quantity of the dog-bone after being horizontally rolled accurately calculated; a changeable amount of side compression exerted on the tapered plate blank is calculated by adopting rapid iteration and taking the rectangular width of an outlet plate blank of the horizontal rolling mill as an objective function, thereby achieving the control method for effectively controlling the tapered blank and overcoming the disadvantage of producing the tapered blank in the traditional control method.

Description

technical field [0001] The invention relates to a production control method of hot-rolled strip steel, in particular to a method of rationally changing the opening degree of a fixed-width side press so that it can be rolled on a conical slab (continuous casting transitional slab) by a horizontal rolling mill. Finally, it becomes a nearly rectangular slab, thereby improving the width control accuracy of the hot rolling mill to produce the tapered slab and reducing the effective control method of width quality loss. 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. Existing hot-rolling rough rolling vertical roll mills or fixed-width side presses are all controlled by fixed openings. The proce...

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Problems solved by technology

Existing hot-rolling rough rolling vertical roll mills or fixed-width side presses are all controlled by fixed openings. The process control system and basic automation system can only control the width of rectangular slabs with the same width at both ends. There is no conical billet rolling. Therefore, the width control of this kind of conical blank can only be realized by manually opening the opening of the small-head slab by the operator. The accuracy of width control is poor and the quality loss is large. , and when the difference between the size and head of the cone parison exceeds 100mm, secondary cutting must be carried out before production can be barely carried out, resulting in slower logistics and higher manufacturing costs

[0003] For the traditional large side pressure control method, see figure 1 , Figure 2, after the conical billet 1 passes through the large lateral pressure equipment 2, because the traditional control method is to control the fixed opening degree, the outlet slab 3 is a rectangular slab, at this time, the cross section of the slab is formed by the lateral pressure of the conical billet The size of the "dog bones" is different. After being rolled by the horizontal rolling mill 4, the width and size of the formed "dog bones" are different, which eventually leads to the rolling of the horizontal rolling mill 4. The slab 5 maintains the disadvantage of the conical billet.

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