Free rolling control method for two rough rolling mills

Abstract

The invention provides a free rolling control method for two rough rolling mills. According to the free rolling control method for the two rough rolling mills, computer process control is adopted, and when rolling is conducted in a three-pass plus three-pass mode, the first rough rolling mill R1 and the second rough rolling mill R2 judge the rolling priority and the allowed rolling condition according to the plate blank prediction length, the number of rolling mill passes and steel feeding interlock factors; during rolling of a plate blank with general specifications, when the rolling mill R1 is located on the first pass and meanwhile the rolling mill R2 is located on the second pass, the rolling mill R2 carries out second pass rolling, and the part, in front of the rolling mill R1, of the plate blank can be directly subjected to first pass rolling; while the rolling mill R2 carries out first pass rolling, the part, in front of the rolling mill R2, of the plate blank does not need to wait to be rolled and completed through a finishing mill, and when no plate blank is arranged on roller bed H1 to roller bed H6 or the length of an intermediate blank body is smaller than the length of an idle roller bed behind the rolling mill R2 after prediction rolling is completed, rolling can be conducted. Accordingly, the rolling time can be shortened by 20 seconds; not only can the output be improved, but also the temperature loss of the intermediate blank body can be reduced; energy sources are saved, the temperature difference of the head and the tail of the plate blank is reduced, and the band steel quality is improved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling technology, and in particular relates to a free rolling control method of a hot-rolling rough-rolling double-rolling mill. Background technique [0002] At present, the roughing mills of the 1580mm hot rolling line in domestic hot rolling mills generally have two roughing mills, namely the first roughing mill (R1) and the second roughing mill (R2). The length of the first group of inter-machine roller tables (G1) to the tenth group of inter-machine roller tables (G10) is 78.4 meters. The length of conventional incoming slabs in the rough rolling area is mostly 10 to 12 meters, and the rolling is done in 3 passes + 3 passes. The original control plan uses two rolling mills in parallel rolling method, and the tapping rhythm is 125 seconds. Rough rolling mill R1 And R2 carry out forward and reverse rolling at the same time according to the R1 forward request program and the R2 reverse request ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the current hot-rolling roughing mill can only be rolled in parallel and cannot be rolled freely under the double-stand arrangement technology, and to provide a rough rolling mill that can improve the rolling rhythm, save energy, and improve the quality of the strip steel. Free rolling control method of double rolling mill

Images