Surface defect form and depth on-line lossless detection method of high-temperature continuous casting blank

Abstract

The invention relates to a surface defect form and depth on-line lossless detection method of a high-temperature continuous casting blank, comprising the following steps: scanning the surface distanceof the transverse direction of the high-temperature continuous casting blank along a pulling-speed direction of the casting blank; measuring distance two-dimensional lattices on the running directionand the transverse direction of the casting blank; converting the distance two-dimensional lattices into a distance dimensional HSB two-dimensional diagram; and finally processing the HSB two-dimensional diagram to recognize the forms of surface defects and calculate the depths of the defects in a quantization mode. The method can effectively inhibit the interference of non-defect oxidative sheetiron in a defect form, realize the surface defect form and depth on-line detection of the continuous casting blank above 950 DEG C and evaluate the quality of the surface defects of the integral high-temperature continuous casting blank. The surface defect form and depth on-line lossless detection method has significances for increasing the automatic level of the surface detect detection of the high-temperature continuous casting blank, reducing the production cost, increasing the direct rolling and heat transmitting and loading rate of the continuous casting blank and has important guiding functions for developing a continuous casting blank quality forecast system, improving a continuous casting process technology and increasing the casting blank quality.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to an online non-destructive quantitative detection method for surface defects of high-temperature continuous casting slabs, and also relates to online detection of the shape and depth of surface defects such as high-speed steel rails and strip steel. The invention has great significance for realizing the online detection and quality evaluation control of the surface defects of the slab covered with non-defective iron scale, improving the automation level of the surface defect detection of the high-temperature slab, and the hot delivery, hot charging and direct rolling rate of the slab. Background technique [0002] The high-temperature slab hot charging and direct rolling (CC-DR) process is a systematic new technology, which integrates steelmaking-continuous casting-hot rolling production, and its advantages are directly reflected in saving heating energy, Reduce oxidation burning loss, i...

AI Technical Summary

Problems solved by technology

The biggest advantage of eddy current testing technology is that it can detect surface and near-surface defects, but affected by the skin effect and lift-off effect, eddy current and ultrasonic testing methods have poor accuracy, are greatly affected by iron oxide scale and vibration marks, and cannot Realize the detection of surface and near-surface defect morphology

The conventional optical inspection method has advantages in the detection of defects on the surface of high-temperature slabs, but it is difficult to identify scale-like iron scales that are not defects but show a certain defect image shape. Wide transverse cracks, but the defect cannot be quantitatively evaluated because the depth information of the defect cannot be detected

So far, there is no stable, accurate and reliable method or system for online detection of surface defects of high-temperature slabs at home and abroad that can be practically applied to continuous casting industrial production lines

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