A method and system for detecting the surface state of a roll based on a double laser profilometer

Abstract

The present application belongs to the technical field of nondestructive testing of rolling equipment, and particularly relates to a rolling mill roll surface state detection method and system based on double laser profilers. In the detection method, two laser profilers are arranged along the circumference of the rolling mill roll at a fixed angle of intersection around the scanning planes of the two profilers, and three-dimensional generatrix original point cloud data is synchronously collected by scanning the cylindrical surface of the rotating rolling mill roll. The coordinate systems of the two profilers are established in turn and unified into a device coordinate system, and a global coordinate system of the rolling mill roll is then constructed to complete coordinate conversion. By calculating the difference between the measured radius of the point cloud and the theoretical radius, in combination with the defect morphology, distribution range and change gradient, the roll surface wear, pits and crack defects are identified. The present application uses double-view scanning to compensate for the defects of insufficient coverage of single-device scanning, effectively avoiding the scanning omission problem in the rotation process. Relying on the calibration of double-source data and two-level coordinate systems, the completeness and accuracy of the rolling mill roll surface defect detection are significantly improved.

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