| 摘要 |
PURPOSE:To offer a forming equipment of a pipe, etc. whose mill rigidity is high and whose shearing strain is scarcely generated at a high working speed by holding and connecting plural ring-shaped tools by an independent member, and making at least one of the tools eccentric and also inclining it. CONSTITUTION:A long column body such as a pipe 24, etc. into which a mandrel has been inserted is advanced into a rolling device. By stopping a rotation of ring-shaped tools 1, 3 of both sides, a central ring-shaped tool 2 is inclined, made eccentric and held in a tool holding member 9. When a gear 12 is driven in the direction going toward the rear side from the surface in the upper part 29, an advance force is applied to the tube 24 by the tool 2 and the forming is advanced in a spiral shape. When the ring-shaped tools 1, 3 are formed to a structure inclined forward and backward, the tools 1, 3 are inclined in the direction for decreasing the frictional force. Also, when the inclined direction of the tools 1, 3 is set to the direction opposite to the inclined direction, the advance force can be applied to the pipe by the tools 1, 3, too. |
