Roll processing flaw detecting method

Abstract

The invention provides a crack detection method of roll dressing, the steps of which is that: scrapping the surface of the rolls after processing; connecting magnetic particle detector to the electricity; spraying black oil magnetic suspension on the defectoscopy of the roll surface; opening the switch of the magnetic particle detector and adjusting the angle of the two contact heads and being positioned at the black oil magnetic suspension sprayed. After observation of the roll surface, magnetic powder can be found at the crack if crack exists; then carrying on flaw inspection in a plurality of different places on the roll surface, the process should be continued if crack is observed until no crack is detected. The invention has the beneficial effects that tiny crack on the roll surface is efficiently detected after roll processing by the detection method. Then appropriate procession can be continued which not only cuts down the loss during raising the processing capacity blindly, but also avoiding the short service life of rolls caused by not eliminating the cracks completely.

Description

technical field [0001] The invention relates to a detection technology in the production of steel pipes, in particular to a detection method for cracks in roll processing. Background technique [0002] Cracks will appear on the surface of the rolls used in steel pipe production, and the cracks will be removed by turning. If the cracks cannot be completely removed during processing, the rolls will age prematurely in the next use and affect the quality of the steel pipe. Frequent replacement of rolls also affects the rolling rhythm, and sometimes even causes serious accidents such as roll cracking and stacking of steel. Therefore, it is very important to detect whether there are still cracks on the surface of the roll after processing. [0003] Because the roll will be subjected to a large rolling force during use, sometimes deep and small cracks will be generated, which are not easy to find with the naked eye after the roll is processed. Therefore, a flaw detection develope...

AI Technical Summary

Problems solved by technology

However, the effect of this method is not very good, and small cracks cannot be detected, which brings blind spots to the inspection of roll processing quality.