Chatter mark detection method and chatter mark detection device for rolling mill

摘要

PROBLEM TO BE SOLVED: To provide a chatter mark detecting method and a chatter mark detecting device of a rolling mill capable of accurately detecting chatter marks even when the line speed changes. A chatter mark detection method for a rolling mill according to the present invention, in a continuous line for passing a steel plate, stripes caused by a variation in plate thickness generated on the surface of the steel plate by vibration of rolls installed before and after the rolling machine. A method for detecting chatter marks of a rolling mill that detects chatter marks that are defects in a shape, a measuring step of measuring vibration, and a calculating step of calculating vibration intensity by frequency-analyzing the vibration measured in the measuring step. A determination step of determining that chatter marks are generated when the vibration intensity calculated in the calculation step is larger than a threshold value set in advance for each frequency band, the determination step includes a threshold value according to the line speed. The step of changing the frequency band in which is set is included. [Selection diagram] Figure 1