| 摘要 |
Disclosed is a method for detecting defects in rotary piercing with high accuracy. A rotary piercing mill (10) is provided with piercer rollers (1a, 1b), a piercer plug (3), a rolling load sensor (4), a thrust load sensor (5) and a control unit (6). The control unit (6) measures a rolling load parameter corresponding to the rolling load of the piercer rollers (1a, 1b), and a thrust load parameter corresponding to the thrust load of the piercer plug (3), and detects defects in rotary piercing on the basis of the measured value of the rolling load parameter and the measured value of the thrust load parameter. |
