Spraying method of wear-resistant coating on roll surface of technology roller of cold rolling unit

Abstract

The invention discloses a spraying method of a wear-resistant coating on the roll surface of a technology roller of a cold rolling unit. A supersonic flame spraying device and a CO2 laser are used. The method comprises the following steps of: firstly, pretreating the substrate surface of a technology roller before hot spraying, and setting the working parameters of a spraying device; then, spraying a WC metal ceramic alloy powder material on the substrate surface of the technology roller, wherein the WC content in the powder material is 73-88%, the alloy mainly comprises NiCr or Co, the alloy content is 12-27%, the powder size is 10-65 mum, and the thickness of the obtained coating is 200-500 mum; and finally, setting the working parameters of the CO2 laser, treating the obtained coating by laser, and blowing in argon gas to the coating during treatment for protection. The coating has ultrahigh binding strength to the technology roller and excellent wear resisting property, and the requirements of the cold rolling technology for the technology roller of the cold rolling unit are satisfied.

Description

technical field [0001] The invention relates to a spraying method of a wear-resistant coating on the surface of a process roll of a cold rolling mill. Background technique [0002] There are many rolls exposed to the atmosphere in the cold rolling production line of iron and steel enterprises. These rolls are usually called process rolls, such as tension rolls, looper rolls, correction rolls, steering rolls, and straightening rolls. The performance requirements of process rolls vary slightly due to different working conditions, but in general, since the process roll is in direct or indirect contact with the steel plate, the performance of its surface is an important factor to ensure product quality, and usually the coating of process rolls must have Properties include: wear resistance, surface roughness retention, anti-slip, anti-sticking iron, anti-sticking zinc, etc. In order to prolong the service life of the process roll, the earliest process method is to electroplate h...

AI Technical Summary

Problems solved by technology

However, the bonding strength between thermal spray coating and the substrate is not good, which limits its application

For some process roll coatings subjected to high loads or certain impact loads, the wear resistance of thermal spray coatings is not good, so in the process rolls of cold rolling mills, thermal spray coatings are difficult to meet the requirements of cold rolling process

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