| 摘要 |
PURPOSE: A calibrating roll device for a raw pipe calibrator is provided to reduce raw material by effectively calibrating a raw pipe and preventing change of length by elongation according to the material characteristic of the raw pipe. CONSTITUTION: A calibrating roll device for a raw pipe calibrator installing a plurality of pairs of calibrating rolls(11) where a raw pipe passes between arc-shaped surfaces in the upper and lower part frame(21,22) of a calibrator at a regular gap for calibrating the raw pipe manufactured by a welding machine, wherein the size of a minimum diameter and a maximum diameter of the pair of unit calibrating roll are arithmetic progressively increased as much as set value as it goes from an inlet part to an outlet part of the raw pipe.
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