Roll barrel crack controlling method of roughing working roll

Abstract

The invention provides a roll barrel crack controlling method of a roughing working roll, which comprises the steps of: firstly, punching a region with a crack on the surface of a roll, especially on the point end part of the crack; and secondly, measuring and recording the length and the depth of the crack on the surface of the working roll before and after operating by using an ultrasonic flaw detection technology to obtain a speed of crack expansion of the roll in an operating process, and judging that the roll is scraped when the depth of the crack reaches or approaches 50mm. Therefore, the stress state of the point end of the crack is changed, the expanding speed of the online crack of the roughing working roll is effectively controlled, the utilization rate of the working roll is furthest developed, the roll consumption of the roll is reduced, and production and equipment accidents caused by shedding and breakage on the surface of the roll are avoided.

Description

technical field [0001] The invention belongs to the field of steel rolling equipment, and in particular relates to a method for controlling and judging cracks in rough rolling work rolls used in hot rolling production. Background technique [0002] Roll is an important deformation tool in hot rolling production, and it is also an important consumable. In hot rolling production, rolls account for 5-8% of the cost of the entire production process, so reducing roll consumption to the greatest extent is an important way to reduce the cost of the production process. [0003] In hot rolling production, it is required that the work rolls of the roughing mill must have good wear resistance and thermal crack resistance. However, due to the characteristics of the roughing mill itself, when the rolls used in the roughing mill encounter production accidents such as jamming, the processing time is relatively long, resulting in more cracks on the rolls, and the cracks are deeper and long...

AI Technical Summary

Problems solved by technology

However, due to the characteristics of the roughing mill itself, when the rolls used in the roughing mill encounter production accidents such as jamming, the processing time is relatively long, resulting in more cracks on the rolls, and the cracks are deeper and longer.

The use of cracked rolls on the machine is likely to cause the surface of the roll to fall off or break the roll, which implies a great unsafe factor