Control method of tandem cold rolling mill emulsion section cooling

Abstract

The invention discloses a control method of tandem cold rolling mill emulsion section cooling, comprising the following steps: a. collecting the device parameter of a rolling mill and the key parameter of band steel to be rolled; b. collecting a technological lubrication institution parameter; c. giving emulsion section cooling flow distribution initial value and iteration precision; d. calculating corresponding work roll thermal crown; e. calculating the lateral distribution value of a slipping factor; f. comparing the slipping factor maximum value with a critical value; g. calculating the lateral distribution value of a slip injury index; h. comparing the maximum value of the slip injury index with the critical value; i. calculating the corresponding strip shape distribution value; j. calculating the function value of a strip shape objective function; and k. judging whether Powell condition is available, and obtaining the control curve of the optimal section cooling flow. The control method of the invention combines device section condition with practical flow control precision to set the emulsion flow in sections, reduces problems of slipping, hot slip injury and the like caused by lubrication and ensures the strip shape and the surface quality index of chassis outlet strip steel rolled stock.

Description

technical field [0001] The invention relates to a production technology of continuous cold rolling, in particular to a method for controlling the staged cooling of emulsion in a continuous cold rolling mill. Background technique [0002] figure 1 It is a schematic diagram of the continuous rolling process of cold strip steel, such as figure 1 As shown, the strip 1 is uncoiled from the uncoiler 2 and then sent to the frame. After being rolled by multiple stands, the strip 1 reaches a specified thickness and is sent to the coiler 3 for rewinding. The rolls of each stand include backup rolls 4 and work rolls 5 , wherein the work rolls 5 are in direct contact with the surface of the strip 1 . In the process of continuous cold rolling production, due to the deformation heat and friction heat generated by the deformation of the metal and the friction between the metal and the roll, the temperature of the roll surface gradually rises, forming a certain roll crown, producing a cer...

AI Technical Summary

Problems solved by technology

However, most of the cold tandem mills in the prior art do not have a corresponding segmental control model for the segmented emulsion injection beams in the frame, and rely on manual experience to set the emulsion flow rate. Although a small number of units have a certain amount of emulsion flow Segmented control model, but the relevant models mainly focus on the shape of the strip, and rarely involve the prevention and control of slipping and thermal slipping, which cannot guarantee the production capacity of the rolling mill and the surface quality of the finished strip

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