Counterflow roller changing method for realizing online roller changing of ESP (endless strip production) finishing mill unit

Abstract

The invention provides a counterflow roller changing method for realizing online roller changing of ESP (endless strip production) finishing mill unit. The method is used for ESP finishing mill unit online roller changing equipment equipped with six racks. During normal rolling production, any five racks are put into operation, and one rack is used as a standby rack. The method adopts a counterflow roller changing strategy and comprises the following steps: (1) collecting and inputting of collecting technology, strip and mill parameters; (2) roller lifting and speed regulation of the roller changing rack Fi; (3) roller speed regulation and roller gap adjustment of the transition rack F (i+1); (4) roller speed regulation and roller gap adjustment of the transition rack F (i+2); (5) adjustment of the transition racks in the upstream of the standby rack Fj; (6) pressing down and roller speed regulation of the standby rack Fj. By control of the roller changing process according to the mathematic model provided by the method, the roller changing efficiency and the roller changing process stability can be improved, the control precision of the product thickness is improved, and the industrial application accuracy requirement can be met.

Description

technical field [0001] The invention relates to the field of metallurgical continuous casting and rolling, in particular to a countercurrent roll changing method for realizing online roll changing of an ESP finishing rolling mill. Background technique [0002] Hot-rolled thin strip steel can be used as finished products or raw materials for cold rolling, and its demand continues to grow worldwide. However, the traditional strip hot-rolling process causes serious environmental pollution and huge energy consumption, which is not conducive to the construction of an energy-saving and environmentally friendly society. At present, the research hotspot at home and abroad is to develop thin slab continuous casting and rolling process, "replacing heat with cold" to produce thin-gauge slab products, thereby reducing energy consumption and environmental pollution. Endless Strip Production (ESP) is a cutting-edge technology in the field of short-process hot-rolled strip at home and abro...

AI Technical Summary

Problems solved by technology

However, since the products of the ESP production line are mainly thin-gauge plate and strip products, the roll wear of the finishing mill is very serious during the rolling process. The roll change cycle is generally twice that of conventional rolling, and the roll change is frequent.

Since the ESP production line is continuous casting and rolling, during the roll change of the downstream finishing mill, the upstream continuous casting cannot continue, and the production line has to be stopped, which seriously affects the production efficiency of thin slab continuous casting and rolling

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