METHOD OF INSPECTING OBVERSE SURFACE OF CONTINUOUS CAST MATERIAL

摘要

Disclosed are a method of, and a device for, inspecting the obverse surface of a continuous cast material that are suited to inspecting the state of the obverse surface of a continuous cast material comprising either magnesium or a magnesium alloy, as well as a method of manufacturing a magnesium substrate material. Light is projected by a light source (10) upon the obverse surface of a magnesium cast substrate material (100) comprising either magnesium or a magnesium alloy, which is continuously cast by a continuous-casting machine, diffusely reflected light arising from the projected light contacting obverse surface imperfections of the magnesium cast substrate material (100) are treated as primary detected light, and an image formed by the detected light is captured by an optical image capture unit (11). The obverse surface state of the magnesium cast substrate material (100) is inspected by an image processing inspection unit (12) on the basis of the image that is obtained by the optical image capture unit (11). Using the image derived from the diffusely reflected light from the light projected from the light source (10), rather than the regular reflected light thereof, allows obtaining high-contrast images. It is possible to suitably detect the microscopic cracks that constitute obverse surface imperfections by using the images thus generated.