Production method for eliminating surface color difference of cold-rolled sheet

Abstract

The invention provides a production method for eliminating the surface color difference of a cold-rolled sheet. According to the method, on the basis that reasons for the formation of the surface color difference of the cold-rolled sheet are analyzed systematically, a working mode of improving working rollers and emulsified liquid of a cold rolling 5# machine frame is provided to overcome the strip-shaped color difference defect on the surface of the cold-rolled sheet, and a set of process production method is formed. The production method mainly comprises the steps that the surface roughness Ra of the working rollers of the 5# machine frame is improved from original 0.2-0.3 [mu]m to 0.4-0.5 [mu]m; the saponification value (mgKOH / g) of the emulsified liquid of the cold rolling 5# machine frame is stabilized to be 180 + / - 10; and the amount of the emulsified liquid sprayed to the working rollers of the 5# machine frame and the surface of strip steel is improved. By the adoption of the measures, it is guaranteed that when the cold-rolled sheet is in a bright rolling state, the strip-shaped color difference on the surface of the cold-rolled sheet is avoided, and surface quality and product grade of the cold-rolled sheet are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a production method for eliminating the color difference on the surface of a cold-rolled sheet. Background technique [0002] Cold-rolled sheets are mainly used in automobiles, home appliances, and various food packaging. In addition to the usual performance and shape requirements, there are high requirements for the surface quality of the steel sheets. Striped color difference on the surface of cold-rolled sheet is a common defect in the production process. The main feature of this defect is that it is distributed in irregular strips along the rolling direction of the strip. Striped chromatic aberration is mainly due to the uneven distribution of surface roughness of the strip, which in turn causes differences in its reflective properties. Through on-site follow-up observation and analysis, it is found that the appearance of chromatic aberration mainly has the following charact...

AI Technical Summary

Problems solved by technology

[0003] 1) The color difference on the upper surface of the strip steel is more severe than that on the lower surface;

[0004] 2) The late stage of a rolling unit is more serious than the early stage;

[0005] 3) Smooth roll rolling is more serious than rough roll rolling;

Although this method mentions improving the uniformity of the oil film on the surface of the steel strip, it does not involve measures such as increasing the saponification value of the emulsion, adding auxiliary nozzles, etc.

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