Method for repairing cold roll

Abstract

The method for repairing working roll for cold-rolling includes the following steps: using the combination of dye penetrant inspection and crack depth detector to define crack position and crack depth; turning working roll for cold-rolling, after it is turned, using dye penetrant inspection method to make inspection, checking and confirming that said working roll has no crack and transferring it into next procedure, if said working roll also has the crack, making secondary turning, low-temp. tempering treatment of crackless roll, further grinding so as to make it reach to requirements for use.

Description

technical field

[0001] The invention relates to a method for repairing cold-rolled work rolls with cracks on the surface but less than the scrapped size. Background technique

[0002] In the production process of stainless steel, cracks will appear on the surface of the cold-rolled work roll after a period of use, which will directly affect the product quality of stainless steel. For example, the diameter of the finished work roll of the 20-roll mill is Φ63.5mm. When the diameter wears to Φ58mm~Φ59mm during production, the cold-rolled work roll is scrapped, and a considerable part of the cold-rolled work roll is less than the scrapped size, and the surface of the roll body is damaged. Cracks have appeared, affecting the quality of stainless steel. Therefore, in order to ensure product quality in production, the cold-rolled work rolls that have not been used to the scrapped size and have cracks on the surface of the roll body can only be scrapped in advance. This will not o...