A Method for Quickly Establishing Thermal Crown of Rolls in Cold Rolling Process

Abstract

The invention discloses a method for rapidly establishing roller thermal crown in a cold rolling process and belongs to the field of metal rolling. When a roller replacing signal of a certain rack isacquired, emulsion flow of a cooling spray beam between racks and emulsion flow of a cooling spray beam at an outlet of the roller changed rack go into a preheating process control mode, the set valueof the number of steel coils needing to be rolled is determined, the number of rolled steel coils is detected and recorded, corresponding reduction adjustment is carried out on the emulsion flow of the cooling spray beam between the racks and the emulsion flow of the cooling spray beam at the outlet according to the result of an original emulsion flow set value multiplied by a proportionality coefficient, and whether the recorded number of the rolled steel coils reaches the set value of the number of the steel coils needing to be rolled is detected; if not, the steps are repeatedly executed;and if yes, the preheating process control mode is finished. By means of the method, rapid establishing of the thermal crown after the rollers are replaced in the cold continuous rolling process can be achieved, the yield loss in the roller preheating process is reduced, and the mass control level of the roller preheating process and the production stability are improved. The method is suitable for the field of production process control of a cold rolling unit.

Description

technical field [0001] The invention belongs to the field of metal rolling, and in particular relates to a control method specially suitable for metal rolling mills. Background technique [0002] At present, in the plate production process of the cold rolling process, most of them use 6-high rolling mills or 4-high rolling mills for production. Taking the 6-high acid tandem rolling mill as an example, when the rolling tonnage of the working rolls or intermediate rolls is reached, it is necessary to carry out work rolls or 4-high rolling mills. Replacement of intermediate rollers. After the corresponding roll is replaced, because the temperature of the roll itself is low, the corresponding thermal crown of the roll has not yet been established, so the ability to control the shape of the plate is poor at this time, and the production process is unstable. [0003] In response to this situation, the current common practice in the industry is to carry out low-speed production of...

AI Technical Summary

Problems solved by technology

[0007] 1. The need for so many preheated coils significantly reduces the production efficiency of the cold rolling process

[0008] 2. Before the thermal crown is established, the product shape control level is significantly lower than that after the establishment, and the quality of the corresponding preheated coil is worse than the normal coil

[0012] The above technical solution involves a roll whose plate crown can be adjusted online, but the production and maintenance costs of this kind of roll are high, and the actual use range is extremely narrow. Generally, cold tandem rolling mills are not used, which cannot solve the problem that this application needs to solve. The problem

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