A Method for Optimizing the Side Tilt Angle of the Nozzle on the Emulsion Spray Rack of the Secondary Cold Rolling Unit

Abstract

A method for optimizing the roll angle of a nozzle on an emulsion spraying frame of a secondary cold rolling unit comprises the following step (A) of collecting the required technological parameters of equipment for optimizing the roll angle of the nozzle; the step (B) of initializing the optimal value Fy of an optimized objective function of the roll angle of the nozzle, and setting the optimal step size delta phi; the step (C) of initializing an optimization process parameter i=0; the step (D) of calculating the roll angle phii of the nozzle; the step (E) of calculating the flow density distribution qli (xj)of emulsions sprayed by a single nozzle in the band steel width direction; the step (F) of calculating the flow distribution qNi (xj)of emulsions sprayed by N nozzles in the band steel width direction after superposition; the step (G) of calculating the horizontal flow distribution qi(xj) of the emulsions of the secondary cold rolling unit within the band steel width range; the step (H) of calculating the optimized objective function F(phii)of the roll angle of the nozzle; the step (I) of judging if F(phii)< Fy is true; the step (J) of judging if phii<phimax is true; and the step (K) of outputting the optimal value phiy of the roll angle of the nozzle on the emulsion spraying frame of the secondary cold rolling unit. According to the method disclosed by the invention, theflow distribution uniformity of the emulsions on the band steel surface of the secondary cold rolling unit can be improved.

Description

technical field [0001] The invention belongs to the technical field of cold rolling, in particular to a method for optimizing the side inclination angle of a nozzle on an emulsion spray frame of a secondary cold rolling mill. Background technique [0002] Secondary cold rolling refers to the secondary rolling of strip steel after cold rolling and annealing. It is often used to produce thin cold-rolled tinplate original plates. The secondary cold rolling unit often adopts the form of double stands. According to product specifications The strip is rolled and thinned at a reduction rate of 10% to 40% in the first stand, and flattened at an elongation rate of 0.5% to 1.0% in the second stand. In order to achieve a larger reduction rate of the first stand, the emulsion direct injection lubrication system is often used for rolling lubrication. During the secondary cold rolling process, the emulsion is sprayed on the surface of the strip by the nozzle installed on the spray frame,...

AI Technical Summary

Problems solved by technology

However, the size of the nozzle side tilt angle not only affects the interference of the emulsion spray flow field of each nozzle, but also affects the uniformity of the emulsion sprayed by each nozzle on the strip surface after the flow density is superimposed, and then affects the width direction of the strip. Uniformity of rolling lubrication and surface quality

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