| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus which accurately performs working of tapered tubes having right and left diameters different from each other in a roll machine. SOLUTION: Driving rolls capable of changing speeds to speeds different by the right and left on a piece of the roll are arranged and the three upper and lower rolls are driven at mutually varied speeds and the intermediate portion is acted free, so that the working of the tapered tube free from slip flaws is made possible. COPYRIGHT: (C)2007,JPO&INPIT
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