Optimization method of process lubrication system for tandem cold rolling mill aiming at prevention of galling

Abstract

Disclosed is an optimization method of a technological lubrication system taking galling prevention as an objective for a tandem cold mill. The method mainly comprises the following computer-executed steps: 1, collecting main equipment and technological parameters of a five-stand tandem cold mill; 2, defining procedure parameters related in the technological lubrication system optimization procedure; 3, giving initial values of emulsion flow, emulsion concentration and emulsion temperature of a first stand, a second stand, a third stand, a fourth stand and a fifth stand; 4, computing a friction coefficient mui of each stand in a current technological lubrication system and rolling schedule; 5, computing rolling pressure, rolling power and slip factors of each stand; 6, computing thermal crown distribution of a working roll of each stand; 7, computing an outlet flatness value of the tail stand; 8, computing a value of a comprehensive galling judgment index lambdai of each stand; 9, computing an optimization objective function in the current technological lubrication system; 10, completing optimal setting of the technological lubrication system, taking the galling prevention as the objective, of the tandem cold mill. By the method, galling defection occurrence probability of each stand is lowered, and outlet surface quality of strip steel is improved.

Description

technical field [0001] The invention relates to the field of cold rolling, in particular to a process lubrication system optimization method for a continuous cold rolling mill with the aim of preventing and controlling fuzzing. Background technique [0002] In the high-speed rolling process of the cold tandem mill, it is often necessary to spray a certain amount of emulsion into the roll gap to form a thin layer of lubricating oil film between the roll and the strip, so that there is only a part of the direct contact between the roll and the strip. Contact, the friction between the two will produce iron powder particles, and will enter the emulsion, when the emulsion with a high concentration of iron powder is sprayed on the roll and the entrance of the roll gap, part of the iron powder (especially combined with oil droplets) Saponified iron powder) will be adsorbed on the surface of the roll and strip along with the rolling oil particles. Since the roll is in a state of ro...

AI Technical Summary

Problems solved by technology

At the same time, for tandem cold rolling mills, the slipping tendency is obvious during high-speed rolling. When slipping occurs, the friction between the roll and the strip in the rolling zone completely changes to sliding friction, and the iron powder adsorbed on the surface of the roll Separation from the surface of the roll under the obstruction of sliding friction, the separated iron powder will quickly accumulate near the entrance of the roll gap, and continuously "scrape" the iron powder at the position behind it as the roll slips in the circumferential direction, and finally in the relatively Under the action of large rolling force, roughness is "engraved" on the surface of the roll along the circumferential direction, which is continuously reproduced on the surface of the strip during the subsequent rolling process, resulting in roughness defects at the corresponding positions of the strip and affecting the surface quality of the strip [1- 3]

In the past, experience and table methods were often used to set the process lubrication system on site, and the same process lubrication system was used for emulsions with different iron powder contents, resulting in frequent occurrence of roughening defects, especially when the iron powder content was high

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