What standard is used to detect the defects of roller working layer?

Non-destructive testing is the standard to detect the defects of roller working layer.

The cost of modern rolling mill roll workshop directly determines the cost of rolling mill, the surface quality of roll directly determines the quality of rolled products, and the internal quality of roll determines the service life of roll.

In the increasingly fierce competition, high product quality and low production cost are prerequisites for the survival and development of an enterprise. How to reduce the cost (roller consumption) and improve the product quality (rollers meet the requirements of steel rolling production line) has become an urgent problem to be solved in roller workshop.

Applying reasonable roller flaw detection methods (mainly nondestructive flaw detection) in production practice has also become a faster and more effective way to solve this problem.

Advantages of reasonable roll flaw detection technology

1. Cost savings

(1) Rolling mills that do not use roll flaw detection generally use open-loop grinding or turning when grinding rolls. Generally speaking, this means removing the standard depth of the roller surface. If the defect is small, it will cause unnecessary waste. If the defect is large, it may not be completely removed. After using the roller detection device, the minimum removal amount can be ensured, and under normal circumstances, only the original 1/3 ~ 1/2 is used, thus avoiding unnecessary losses and ensuring the grinding quality of rollers.

(2) It can reduce the downtime of the rolling mill, improve the service life of the roll, and reduce the amount of scrap steel and the decline of product quality caused by crack propagation under normal operation. After applying reasonable roller flaw detection, the minimum size of each roller can be basically guaranteed before scrapping. In this way, it can be solved that many rolls can not be detected due to internal defects, which leads to the expansion of defects and eventually leads to many rolls breaking or other accidents that seriously affect production.

Common flaw detection methods

Common roll flaw detection methods are mainly as follows: magnetic particle flaw detection, infiltration coloring flaw detection, eddy current flaw detection and ultrasonic flaw detection.

Reference to the above content: Sohu. Discussion on common roll flaw detection methods in roll workshop