Laser repair method of high-carbon hard-face crack-free large-thickness cold roll

Abstract

The invention discloses a laser repair method of a high-carbon hard-face crack-free large-thickness cold roll. The laser repair method comprises the steps that a to-be-repaired area of the cold roll face is determined, and the surface of the to-be-repaired area is pretreated; the to-be-repaired area is subjected to preheating treatment, and a low-carbon transition layer is prepared on the to-be-repaired area through laser cladding; multiple high-carbon work layers are prepared on the surface of the low-carbon transition layer through laser cladding; and the surface of a laser repair layer formed by the low-carbon transition layer and the high-carbon work layers is subjected to grinding treatment till the axle diameter dimension and roughness of the surface of the laser repair layer are consistent to the process requirements of the cold roll. According to the laser repair method, through reasonable design to alloy powder components and optimization selection of process parameters, the crack-free laser repair layer is prepared, and the coating microstructure is uniform and compact; and through reasonable control over the structures and thickness of the laser repair layer, the structure and performance of multiple cladding layers effectively cooperate, the laser repair layer large in thickness and high in performance can be prepared, and the repair efficiency of the roll is greatly improved.

Description

technical field [0001] The invention relates to the technical field of rolls, in particular to a laser repair method for a high-carbon hard surface without cracks and a large thickness of cold rolls. Background technique [0002] Metallurgical rolls are important consumable parts that determine the efficiency of rolling mills and the quality of rolling stock. For cold rolls, the rolling load is generally high, and the cold rolls for rolling plates and strips must have sufficient strength, uniform high hardness and surface quality to withstand extremely high rolling forces and ensure sufficient resistance Abrasion ability, to meet the accuracy requirements of rolled products. At present, the average service life of high-carbon hard-faced metallurgical rolls such as work rolls, pinch rolls, and back-up rolls used for rolling strip steel is relatively short, and the working surfaces of the rolls wear rapidly to a certain extent, resulting in unusable and waste disposal, and an...

AI Technical Summary

Problems solved by technology

However, cold-rolled work rolls are generally metallurgical spare parts with high carbon content, and it is still difficult to meet the performance requirements of welding and crack control of the cladding layer during the repair process using laser cladding technology

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