| 摘要 |
PROBLEM TO BE SOLVED: To control the rolling with a mandrel mill so as to manufacture the steel tube having accurate dimensions at the next stage by performing rolling so that the dimensions of a tube stock are most proper in rolling with the mandrel mill. SOLUTION: The perimeter and the circularity of the tube are measured with a profile meter using a scanning laser range finder or the like on the outlet side of a mandrel mill and the roll gap and the number of revolution of the mandrel mill are feedback-controlled so that the difference between the measured value and the preset value becomes zero.
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