Color grade determination method for defect in roller through airborne flaw detector

Abstract

The invention discloses a color grade determination method for a defect in a roller through an airborne flaw detector. The method employs a supersonic wave flaw detector to perform flaw detection on a working layer and a binding layer of the roller, and the reference sensitivity is set. The flaw detector takes the height of amplitude of supersonic wave as an evaluation index value; an actual measured value is an echo value received by a normal probe; and a display value is shown after conversion. The actual measured value and the display value are set to satisfy a linear relation, and the actual measured value is set into ten risk levels and corresponding colors of the defect in the roller. When the risk level value is 1.00 and the color is purple, a risk alarm of the roller is determined, and when the risk level value is 0.60 and the color is above light yellow, a roller risk pre-warning is determined. Once the working layer and binding layer of the roller is subjected to flaw detection by the flaw detector through the method, the amplitude of the detected wave is converted to form corresponding grades and colors. The grades and colors are defined, so that direct accurate determination of the defect in the roller is given, and the working performance is improved.

Description

technical field [0001] The invention relates to a method for judging the color progression of roll defects by an airborne flaw detector. Background technique [0002] Generally, the rolls used in strip steel production are made of cast iron, cast steel or forged steel. During the manufacture and use of rolls, the working layer or bonding layer on the surface of the rolls often produces detectable defects. The detection technology of roll surface defects has become more and more mature. Eddy current, magnetic particle or coloring are commonly used to find the defect position of the roll and show the shape and characteristics of the defect. At present, the use of ultrasonic flaw detection has gradually matured, but it is impossible to directly use the naked eye to judge defects, and the shape and characteristics of defects cannot be displayed intuitively. [0003] As the production workpiece of strip steel, the roll needs to be replaced frequently to restore the accuracy of t...

AI Technical Summary

Problems solved by technology

However, the airborne flaw detector performs flaw detection continuously, and the detection results of the working layer or bonding layer of the roll need to display and judge the defects. Usually, it depends on the display of the testing instrument and the interpretation with certain experience, and it is impossible to make an intuitive analysis of the defects. , The correct judgment affects the efficiency of roll defect detection

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