Method for solving wave shapes among racks through proportional convexity variation coefficients

Abstract

The invention relates to a method for solving wave shapes among racks through proportional convexity variation coefficients. The method comprises the following steps of determining the ratio convexityvariation coefficient of each rack, determining the target convexity of a product, configuring the convexity of a middle blank, calculating the convexity value of each rack and the like. According tothe method for solving the wave shapes among the racks through the ratio convexity variation coefficients, it can be guaranteed that the head convexity of strip steel reaches the target value completely, that is to say, it is guaranteed that the outlet convexity of each rack is within the equipment capability range, and the precondition is established for the purpose of enabling the full-length convexity to reach the target value. In addition, it can be guaranteed that no wave shape exists among the racks and at an outlet of a finish-rolling group, especially the flatness of the strip steel between the finish-rolling rear-section racks such as F5, F6 racks and F6, F7 racks. Thus, the strip-threading stability in the thin-specification strip steel rolling process is guaranteed, the rollingplan is finally prolonged by at least 15% or above, the roll changing time is reduced, and the roller consumption is reduced.

Description

technical field [0001] The invention relates to a method for solving the wave shape between racks through the coefficient of proportional convexity variation, and belongs to the technical field of steelmaking. Background technique [0002] The hot continuous rolling process of finishing rolling is usually composed of 7 or 6 or even 5 finishing mills, rolling intermediate billets of different thicknesses into strips of various widths (0.8-25) mm in thickness. When producing thin-gauge products, the shape quality of the strip between the racks and the finish rolling exit not only relates to the shape quality of the product, but more importantly, involves the success of strip threading and the stability of rolling. The strip shape control system mainly includes the control of crown and flatness (model setting and control of bilateral waves and intermediate waves, that is, symmetrical wave shape), and the straightness between racks depends on the strip convexity of each rack. d...

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Problems solved by technology

[0005] For example, in the literature reported above, it is not found that by adjusting the proportional crown variation coefficient, the simultaneous control of the crown and wave shape of each stand of hot continuous rolling can be realized.

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