Metallurgical continuous casting machine roller repairing method

Abstract

The invention relates to a metallurgical continuous casting machine roller repairing method. The metallurgical continuous casting machine roller repairing method includes the steps of disassembling, cleaning, repairing a roller body, repairing a bearing seat and other parts, assembling, inspecting finished product, packaging, and protecting. If every ton of various rollers can save RMB25000 for enterprises, and annular salary for a worker on a production line of a steel-making enterprise is RMB35000, the manufacturing cost saved via the roller repairing and recycling technology can basically guarantee salaries of the whole year of all workers on the production line; as for a mechanical processing factory, the addition of the repairing production line can supply 30 employment opportunities for local residents, so that corresponding contribution can be made to social employment rate and increasing of local taxation.

Description

technical field [0001] The invention belongs to the technical field of metallurgical equipment repair, and relates to a method for repairing rollers of metallurgical continuous casting machines. Background technique [0002] As the core component of continuous casting equipment, continuous casting rolls are mainly used to transport products. If there is an accident in the production process, the entire production line may be shut down, and its quality, strength and service life will directly affect the continuous casting equipment. work rate. [0003] According to the analysis of failure forms of continuous casting rollers by many research institutions at home and abroad, the main reasons for continuous casting roller damage are as follows: [0004] One is thermal fatigue damage: Thermal fatigue damage is one of the main causes of continuous casting roll damage. The cause is that the circumferential temperature distribution of the roll surface in the working state is uneven...

AI Technical Summary

Problems solved by technology

[0004] One is thermal fatigue damage: Thermal fatigue damage is one of the main causes of continuous casting roll damage. The cause is that the circumferential temperature distribution of the roll surface in the working state is uneven, and sometimes the temperature difference between the roll surface and the internal temperature exceeds 300 ° C. Therefore, Non-axisymmetric, periodically changing, and unevenly distributed thermal stress occurs on the surface and inside of the roller, and the continuous casting roller is fatigued and damaged under the joint action of mechanical stress and thermal stress

[0005] The second is the quality of raw materials: The quality of raw materials determines the overall quality of continuous casting roll products. If the material with good yield strength at room temperature is selected, the yield strength at high temperature may drop sharply, and the thermal fatigue crack resistance is not enough. It will lead to thermal fatigue damage of continuous casting roll

[0006]Third is wear: the wear of the base material of the roller is the most intuitive reason and the most direct cause of damage. In a high temperature and humid environment, the surface of the roller is prone to oxidation and corrosion. During the production process, due to the load impact of the produced product, the outer diameter of the roller is reduced and thinned, resulting in the scrapping of the roller

It is very costly for metallurgical enterprises to be scrapped due to the wear of the outer layer, so most of the current domestic rollers are mostly repaired.

[0008] At present, the existing repair methods mainly include open welding repair, submerged arc welding repair and thermal spray repair: in the process of open welding repair, the solder joints are directly exposed to the air, and the surfacing material is easily oxidized at high temperature, forming a large amount of Welding slag and pores affect the quality of surfacing; thermal spraying wear-resistant materials are not suitable for recoating thicker coatings because of the high price of materials; therefore, the most effective repair method at present is submerged arc welding repair