A method for remanufacturing a cast iron roll based on laser cladding and a remanufacturing cast iron roll

Abstract

The invention provides a re-manufacturing method for a cast iron roll based on laser cladding and a re-manufactured cast iron roll and relates to the technical field of metal surface treatment. Lasercladding has relatively low heat input and generates a relatively small heat affecting area and heat deformation, a transitional cladding layer which is not cracked is prepared on the roll surface ofthe cast iron roll by combining a material for the transitional cladding layer and a material for a high-temperature wear-resistant cladding layer, and the high-temperature wear-resistant cladding layer is cladded to the surface of the transitional cladding layer, so that re-manufacturing of the cast iron roll reaching limiting size is achieved. The re-manufacturing method overcomes the defect that the surface of the cast iron roll is cracked as a result of conventional surface re-manufacturing techniques such as overlaying, plasma arc cladding and spray welding. Meanwhile, the material for the transitional cladding layer and the material for the high-temperature wear-resistant cladding layer are designed reasonably, so that hardness of the cast iron roll, the transitional cladding layer and the high-temperature wear-resistant cladding layer is increased in a gradient manner, and the service life of the re-manufactured cast iron roll is prolonged greatly.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a method for remanufacturing a cast iron roll based on laser cladding and a remanufactured cast iron roll. Background technique [0002] In recent years, with the increasing demand for large-scale infrastructure construction and modern industrial development in my country, the use of steel, especially high-quality steel, has greatly increased. As a key component of a rolling mill, rolls play a pivotal role in improving the quality of steel products. [0003] In the normal rolling process, the rolls will be worn and fatigued due to many reasons, especially the cast iron rolls used in large quantities, which need to be turned or ground before they can be used again, and for the cast iron rolls that have reached the size limit, the gap adjustment has already If the use requirements cannot be met, they can only be scrapped, resulting in the scrapping of a large numbe...

AI Technical Summary

Problems solved by technology

[0003] In the normal rolling process, the rolls will be worn and fatigued due to many reasons, especially the cast iron rolls used in large quantities, which need to be turned or ground before they can be used again, and for the cast iron rolls that have reached the size limit, the gap adjustment has already If they cannot meet the requirements of use, they can only be scrapped, resulting in the scrapping of a large number of out-of-tolerance cast iron rolls, which not only increases the cost of the enterprise, but also causes a lot of waste of metal materials

[0004] For these out-of-tolerance cast iron rolls, surfacing welding, plasma cladding and other technologies are used. Due to the large heat input in the welding process, the surface of the cast iron rolls is often cracked, resulting in the roll being scrapped and the remanufacturing of the roll cannot be completed; and laser alloying is used. technology, for these out-of-tolerance cast iron rolls, it is also impossible to realize the additive remanufacturing of the roll surface with a larger size