Process for repairing continuous casting crystal roller

Abstract

The invention discloses a repairing method of a continuous casting crystallization roller, which relates to a repairing technique of the continuous casting crystallization roller, in particular to a technique utilizing a metal atomization spray and deposition process to repair the crystallization roller. The method is mainly characterized in that: the surface of the crystallization roller is cleaned, then the roller is positioned into a spraying atomization and deposition chamber and heated, then high pressure inert gases are input thereto for atomizing a metal repairing material in a molten state and making the material deposit on parts needing to be repaired of the crystallization roller, finally the redundant parts are removed through machining, thereby the repairing to the damaged parts or the whole surface of the crystallization roller is completed. The method can avoid the defects existing in the current crystallization roller repairing technique, and can improve the repairing efficiency and quality of the crystallization roller and extend the service life of the crystallization roller.

Description

technical field [0001] The invention relates to a technology for repairing the surface of a continuous casting crystal roll, in particular to a technology for repairing the surface of a metal strip continuous casting crystal roll. Background technique [0002] The crystallization roll is one of the key components of the thin metal strip continuous casting and rolling equipment. Its main function is to rapidly cool, solidify and roll the molten metal to form a thin metal strip. The basic principle is that molten steel is injected into the triangular area formed by two counter-rotating crystallization rollers and the side sealing plates used to block the two sides of the crystallization roller through the flow distributor, and the liquid metal is rapidly cooled and solidified on the surface of the crystallization roller. The blank shell with a certain thickness forms a thin strip (plate) after rolling. The normal rolling force of the crystal roll is less than 15 tons, and it ...

AI Technical Summary

Problems solved by technology

However, after turning, the roll diameter of the crystallization roll becomes smaller and the copper plate of the roll sleeve becomes thinner. After several turning repairs, the copper plate of the roll sleeve of the crystallization roll is too thin, the distance between the surface and the internal cooling water gap is too small, and the thin strip continuous casting process changes too much. Large, which will lead to a serious decline in the quality of the casting belt, and the crystallization roll has to be scrapped

The process of surfacing repair often causes local oxidation of copper alloy, forming a high-oxygen interface between the repair area and the substrate, which affects the thermal conductivity and mechanical properties of the crystal roller; thermal spray repair is to use high-temperature and high-speed oxygen flame or high-temperature plasma beam to The repair material is sprayed and deposited on the area to be repaired on the crystal roller, and there are also problems such as high oxygen content in the repair area; cold spray repair has defects such as low efficiency and low interface bonding force

[0004] At present, the method of repairing the thin strip continuous casting crystal roll by spray atomization deposition method has not been reported yet