Method for detecting surface evenness of steel plate coating

Abstract

The invention relates to a method for detecting the surface evenness of a steel plate coating. In the method, by using the characteristics that lines written with a marking pen can be scraped away when immerged in water and are uneven at defect parts, the types and the positions of surface defects of the steel plate coating can be determined according to the shapes of residual pen marks and corresponding measures are taken to control and solve the surface defects; therefore, the surface quality, the insulativity and the corrosion-resistance of the steel plate coating can be improved, which has valuable significance for improving the performance of the steel plate coating. The invention provides a simple and practical method for detecting the surface evenness of a steel plate with a coating. Without any equipment and investment, the method provided by the invention can accurately detect tiny uneven parts which cannot be seen with naked eyes and provide an important quality proof for the production of coatings. The method can be applied to the surface evenness detection of smooth materials.

Description

technical field [0001] The invention belongs to the field of inspection methods, and in particular relates to a method for inspecting the surface roughness of a cold-rolled silicon steel coated steel plate. Background technique [0002] In the production process of cold-rolled silicon steel coating, small point-like coating defects will occasionally occur, resulting in reduced corrosion resistance of the coating at the defect site, poor insulation performance, and corrosion spots during storage, affecting the coating The appearance quality and processing of the board are used, and some are even unusable. The main reason for the formation of coating point defects is that the coating liquid has poor leveling before drying and curing. At present, the coating production process of silicon steel is composed of roller coating + high temperature curing process. The high temperature of the strip steel plate entering the roller coating machine will inevitably lead to poor leveling o...

AI Technical Summary

Problems solved by technology

Since the grooves on the surface of the coating roller are very small, the depth is about 0.09mm, and the number of teeth is 56, once such tiny coating surface waves occur, inspectors cannot see them with the naked eye.

Because it is difficult to check out, and the country has no relevant standard requirements, it has not been possible to find a suitable inspection method, making the inspection of small point defects on the surface of steel plate coatings a difficult problem to solve