| 摘要 |
PROBLEM TO BE SOLVED: To accurately find a solidification state, for example, a central solid phase rate. SOLUTION: A transverse ultrasonic wave is made incident on a cast piece S from an electromagnetic ultrasonc transmitting element 1a of a transmitting probe 1, a received signal from an electromagnetic ultrasonic receiving element 2a of a receiving probe 2 is fed to a transmitted signal measuring circuit 7, and the circuit 7 computes the intensity of the transverse ultrasonic wave. A lift-off data obtained from eddy current type range finders 1b/2b is taken in an operation circuit 8 to correct intensity of the transverse ultrasonic wave. A central solid phase rate is calculated from the corrected intensity of the transmitted transverse ultrasonic wave to be output to a measured result outputting device 9. The device 9 finds a pressure data corresponding to a computed result from the operation circuit 8 based on a preliminarily given relation between a central solid phase rate and a drafting rate to be output to rolling rolls 32, 32. |
