Metal material with low waviness surface and manufacturing method thereof

Abstract

The invention discloses a metal material with a low waviness surface. The surface of the metal material has a large number of roughen points, and the area of a single roughen point is 400-10,000 [mu]m<2>. The difference in size among the roughen points is less than 50%. The roughen points are disorderly distributed, and the mutual overlap amount between the roughen points is less than 10%. In addition, the invention further discloses a manufacturing method of the metal material with the low waviness surface. The manufacturing method comprises the steps that (1) a mill roll is subjected to grinding and polishing machining, the roll surface is cleaned to enable the mill roll surface roughness Ra to be less than 0.5 [mu]m, and the surface is free of oil; (2) the surface of the mill roll is subjected to roughen processing, specifically, the surface of the mill roll is irradiated with a laser pulse to form the roughen points on the surface of the mill roll; and (3) the mill roll after the roughen processing is used for rolling or leveling a metal material to obtain the metal material with the low waviness surface. The metal material is provided with the low waviness surface while havingcertain roughness on the surface of the material.

Description

technical field [0001] The invention relates to a material and a manufacturing method thereof, in particular to a metal material and a manufacturing method thereof. Background technique [0002] In recent years, due to the continuous improvement of environmental protection requirements and market pressure, more and more automobile factories have upgraded the traditional 3C2B coating process to 2C1B coating process. The main difference is that the intermediate coating and intermediate coating baking steps are cancelled. . Due to the reduction of one coating and one baking leveling process, the surface micro-roughness on the material will be more easily transferred to the painted surface, so the new 2C1B coating process puts forward higher requirements on the micro-roughness of the material surface. A large number of experts and scholars have found that there is a significant correspondence between the waviness of the material surface and the coating effect. Generally, the lo...

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Problems solved by technology

However, the problem with the technical solution disclosed in this patent document is that its surface topography is a regular texture topography, and regular surface topography is prone to "moiré" defects during painting

[0006] To sum up, in the prior art, the surface waviness of the steel plate is reduced by optimizing the rolling and leveling roll matching process, which can properly reduce the surface waviness, but the micro-morphology of the roll has not been optimized, and the publication number is The microscopic surface topography design of the roll proposed in the Chinese patent literature of CN104884180A will cause the surface texture to be too regular, and it is easy to produce coating defects

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