| 摘要 |
PURPOSE:To prevent the damage of the packing inserted in a receiving mouth part or that of an insert port part by expanding the diameter of the end part of a composite pipe and subsequently reducing the diameter of the end part of the opening side thereof until the end surface on the opening side is brought into contact with a core part. CONSTITUTION:When a composite pipe 10 is supported by a support member 31 and the end part thereof is expanded in its diameter, the end part of the composite pipe 10 is engaged with the recessed part 52a of a throttling mold 52 on the opening side of the pipe 10 in the supported state. Subsequently, when the piston rod 51a of a hydraulic cylinder 51 is advanced and the throttling mold 52 is allowed to approach the support member 31, the end part expanded in its diameter on the opening side of the composite pipe 10 is introduced into the recessed part 52a of the throttling mold 52 under pressure and the outer peripheral surface of the end part on the opening side is slid with the inner peripheral surface of the recessed part 52a to reduce the diameter of the end part on the opening side. Then, the end surface on the opening side is allowed to strike against the outer peripheral surface of the core part 52b arranged to the central part of the recessed part 52a of the throttling mold 52. By this method, the end surface on the opening side becomes smooth to be brought to a state along the outer peripheral surface of a protruding part 52b. As a result, a packing or an insert port can be easily inserted in the prepared receiving mouth part without damaging a packing, the insert mouth part or the like. |
