Graphic analysis of the relationship between surface morphology of Cold rolled steel plate and film freshness

The appearance quality of the paint film after painting is a very important indicator of the quality of the car. The surface morphology of the steel plate has a very important influence on the appearance quality of the steel plate after painting. The smoother the surface of the same material, the less diffuse reflection of light, the brighter the surface, and the higher the definition of the image. However, if the surface of the steel plate is too smooth, the surface of the steel plate will be roughened during forming and stamping, which will deteriorate the painting effect. The final surface morphology of the steel plate is formed by the transfer of the surface topography of the roll. A roll with a smooth surface tends to form an overall thick oil film between the steel plate and the roll during rolling, which makes it difficult to control the uniformity and stability of rolling. Therefore, good stamping ability, stability and uniformity of steel plate rolling all require the steel plate and roll to have a certain roughness, which constitutes a pair of contradictions with the requirements of the appearance quality of spray painting on the roughness of the steel plate. The purpose of this paper is to study the influence of surface topography on the distinctness of image of the paint film, and to find out suitable surface topography parameters and quantitative indicators, so that the steel plate for cars can not only meet the requirements of stamping and rolling, but also ensure the smoothness and smoothness of the paint film. Appearance quality - high distinctness of image.