Preparation method for tension-roller thermal-sprayed coating

Abstract

The invention discloses a preparation method for a tension-roller thermal-sprayed coating. The method comprises: firstly pre-treating the surface of a tension roller to reach thermal spraying requirements; employing a WC-Co, WC-CoCr, WC-NiCr or WC-Ni powder material to perform thermal spraying processing under certain parameter conditions, so as to obtain a coating with the thickness of 0.2 mm or more; employing epoxy resin and a curing agent, mixing according to a ratio, then coating the surface of the tension roller coating with the mixture, and placing for 24 h or drying at 100-120 DEG C for 2-3 h; employing a whetstone or diamond abrasive belt to perform polishing processing on the coating surface; and performing texturing processing on the tension-roller surface by employing sand grains with different particle size according to the different roughness finally needed by the tension roller, so as to obtain the tension-roller coating surface with different roughness. The prepared tension-roller thermal-sprayed coating possesses excellent wear resistance, shock resistance and roughness retention capability, is strong in surface foreign-matter adhesion resistance, satisfies practical production usage requirements of a tension roller, and helps to improve the quality of strip steel products.

Description

technical field [0001] The invention relates to a preparation method of a thermal spray coating of a tension roller. Background technique [0002] Thermal spray coatings have gained increasing popularity, especially in the steel industry, due to their high cost-effectiveness. In the continuous cold rolling production line of strip steel, there are a large number of tension rolls, and the thermal spray coating of the tension rolls can significantly improve its wear resistance, impact resistance, corrosion resistance and other properties. In the continuous production of strip steel cold rolling, the tension roll is in direct contact with the strip steel, and its surface performance is an important factor to ensure the quality of the strip steel product. Therefore, the requirements for the surface performance of the tension roll are also constantly increasing. At present, the thermal spray coating has been widely used to improve the surface performance of the tension roller. ...

AI Technical Summary

Problems solved by technology

At present, the thermal spray coating has been widely used to improve the surface performance of the tension roller. The sprayed coating is relatively hard, especially from the microscopic magnification of the roller surface, the surface has a peak shape, so in actual use, the tension roller is easy to scratch the surface of the strip steel, so that the scratches on the surface of the strip steel adhere to the tension roller surface, forming a foreign matter adhesion defect of the tension roller

Foreign matter adhesion defects will not only reduce the surface roughness of the tension roller, but also make the tension roller unable to achieve the effect of providing a certain tension as originally designed, causing the strip to slip

At the same time, the adhesion of foreign matter will also cause certain defects on the surface of the strip steel, such as roll marks, black spots, spot scratches, scratches, etc., which seriously affect the quality of strip steel products

Therefore, the original thermal spray coating on the surface of the tension roller can no longer meet the current requirements of the tension roller, and it is necessary to improve the anti-foreign matter adhesion ability of the thermal spray coating of the tension roller

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