| 摘要 |
PURPOSE:To enable flaw detection on the whole surface of a roll efficiently and correctly by shifting the phase in the circumferential direction of a roll corresponding to a flaw detectable width at every path by plural pulses of finishing to perform flaw detection. CONSTITUTION:When flaw detection is made once round a roll in the axial direction of the roll at the final one path, flaw detection is made at certain intervals of the flaw detectable width. Accordingly, if the phase of the next second path is controlled to be shifted, the nest phase to flaw detection on the first orbit is subjected to flaw detection. Further, a part not subjected to flaw detection is again shifted in phase, and flaw detection at the third path is made in the circumferential direction of the roll. thus, when the final plural paths in the whole N-paths of finishing are subjected to flaw detection while the maximum feed speed determined by the flaw detectable width is taken and the phase in the circumferential direction of the roll is controlled to be shifted corresponding to the flaw detectable width at each path, flaw detection for the whole surface of the roll can be accomplished after N-paths. Thus, flaw detection for the whole surface of the roll can be completed simultaneously with finishing. |
