Laser strengthening method for casting roller of aluminum casting rolling mill

Abstract

The invention discloses a laser strengthening method for a casting roller of an aluminum casting rolling mill. The method is characterized by comprising the following steps of: polishing and derusting a metal matrix, and removing oil; uniformly spreading or spraying an alcoholic saturated solution of shellac, alcohol, and metal powder or alloy powder with the particle size of +1 to -50mu m onto the metal matrix; and performing laser strengthening by using a CO2 laser. The invention provides a laser strengthening method; a strengthening layer area which is rich in alloy elements is formed on the surface of the casting roller; a strengthening layer has high hardness and wear resistance, defects such as cracks, pores and the like are avoided, and the strengthening layer and a roller sleeve matrix have large binding force and are in metallurgical bonding; and the strengthening layer cannot affect the thermal conductivity of a roller sleeve and the basic mechanical performance of a matrix material, can also not change a process for using the casting roller, and can improve thermal fatigue cracking resistance.

Description

technical field [0001] The invention relates to the technical field of aluminum processing, in particular to a method for applying laser surface strengthening treatment to the surface of a roll sleeve of a casting roll of an aluminum casting and rolling mill. Background technique [0002] The casting roll is an important core component of the aluminum casting and rolling mill. In the production process of aluminum casting and rolling, its function is to continuously complete the solidification, crystallization and rolling of the molten aluminum in the casting and rolling area with a length of 60mm to form a cast-rolled slab. . In this process, the casting roll is affected by three aspects: firstly, the huge rolling force; secondly, the huge temperature gradient, because the temperature of the casting roll surface is about 700 ℃ in the casting and rolling zone, leaving the casting and rolling After the zone, the temperature dropped sharply to about 300 °C, so it was impacted...

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Problems solved by technology

[0006] Chinese patent 101864567A proposes to use chemical methods to form a light yellow iron oxide covering layer of 0.05 to 0.1mm on the roller surface with methanol and nitric acid solution to improve hardness, and use a mixture of graphite milk, alcohol and water as a lubricant, but there is no When it comes to the effect of use, and the binding force of iron oxide itself is not strong, there is a high possibility of falling off during the heat exchange process

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