PURPOSE: To reduce defective products by measuring the amplitude of vibration of a shell on the outlet side of an elongator with the measuring sensor of a single axis CCD camera, sending these signals to a means for judging amplitude of vibration, calculating the average value of peak value and raising an alarm when set threshold value is exceeded.
CONSTITUTION: The amplitude of vibration of the shell in red heated state on the outlet side of the elongator is continuously measured with the measuring sensor 1 in which the single axis CCD camera 11 is used. The signal of this measured amplitude of vibration is sent to the means 3 for judging amplitude of vibration and the average value of the peak value of amplitude of vibration of the shell per one seamless tube is calculated. When the calculated average value exceeds the threshold value that is preliminarily set, the alarm is raised by sending a signal to an alarming means. When the amplitude of vibration of the shell is grasped, the generation of thickness deviation can be naturally detected. In this way, the thickness deviation that is generated in the shell can be detected on the outlet of the elongator and the generation of defective products due to thickness deviation can be reduced.
YAMASHITA HAJIME
KAMINAGA IWAO
YASUOKA HIDENORI
KUWANO TAKASHI
OTSUKA TSUNEYUKI
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