| 摘要 |
PURPOSE:To balance a working force of working rollers and to iron a thick pipe with high accuracy by arranging plural pairs of paired opposing working rollers while deviating them along the longitudinal direction of a thick-walled pipe attached to a mandrel. CONSTITUTION:In a spinning machine that obtains a thin-walled cylinder by inserting a work 12 made up of a specified thick-walled cylinder to a part of a mandrel 10, bringing two pairs of working rollers 30, 30 and 32, 32 into contact with the outer peripheral face and performing rotary ironing, paired rollers 30, 30 and 32, 32 are arranged on straight lines M-M and N-N that intersect the center axis of the mandrel 10 at right angles with each other and are deviated to the circumferential direction of the mandrel 10. At the same time, they are disposed specified distances away from the axial direction of the mandrel 10. Gaps C1, C2 between rollers 30, 32 and the mandrel 10 are made nearly equal, and the gaps C1, C2 are constituted to contact the work 12 through specified steps. |
