Method for restoring and improving service life of hot roller and cold rolling subsidiary roller

Abstract

The present invention relates to a method to resume and improve the service life of hot rollers and cold auxiliary rollers, which comprises the following steps: (1) test the stress of working roller body of invalid or scrapped rollers, and then test the damage degree of cracks and peeling layers on stress concentration parts; evaluate the residue life and analyze the strength based on the tested damage degree; evaluate remanufacturing craftwork and economical efficiency, forecast the service life and design the service life period on the basis; (2) use laser quick shape deposition manufacture to quickly form the original shape of the roller with designed service life; (3) after the roller is quickly formed through laser quick shape deposition manufacture, conduct the process treating of strengthening and toughening for the material of the deposition layer. The method to resume and improve the service life of hot rollers and cold auxiliary rollers has the advantages that: the steel rolling throughput during the rolling process can be improved by 30% to 50%; the service cycle can be prolonged; and the service life of the backup roller can be improved by more than 30%.

Description

technical field [0001] The invention relates to the iron and steel metallurgy industry, in particular to a method for restoring and increasing the service life of hot rolling rolls and cold rolling auxiliary rolls. Background technique [0002] In iron and steel enterprises, hot rolls and auxiliary rolls for cold rolling used in hot and cold continuous rolling production lines are important, but there are parts that are consumed in large quantities. For example, the back-up roll is an auxiliary roll in the roll, and the back-up roll is cast or forged from high-carbon and high-alloy steel. In a rolling production line, the back-up rolls are passive rolls. During operation, the front is squeezed, the bottom is compressed, the rear is pulled, and the deep layer is subjected to shear stress. Therefore, when the backup roller is running, it is subjected to alternating loads such as extrusion and cutting near the contact point. Due to the inclusions, holes, tiny cracks and othe...

AI Technical Summary

Problems solved by technology

However, it is difficult to restore the service life and use effect to the level of the original manufacturing of new rollers

However, there is no better technical method to improve the service life and performance of the medium and large failed backup rolls of more than 30 tons, or even more than 120 tons.

More than 60% of the medium and large backup rolls used in domestic iron and steel enterprises are imported from abroad, which is expensive and is a major consumption cost in the iron and steel industry, and it is also a long-standing problem