| 摘要 |
PURPOSE:To obtain a receiving port having smooth peripheral face without uneven portion by a method in which an inside mold A to form a bond-type receiving port by expanding the end of a synthetic resin tube and an outside mold B to vacuum-suck and pressurize the peripheral side of the receiving port so expanded are used, and the space between the outside mold B and the peripheral side of the receiving port is evacuated to vacuum to expand the outer wall toward the peripheral direction. CONSTITUTION:One end of a hole tube P2 is softned by heating by means of a heater, and an inside mold A is pressed into the end portion of the tube P2 to expand the end portion of the tube P2 to the diametrical direction by the expanded portion 1 in order to form a sleeve form of receiving port. When the tapered portion 3 is moved to the left side, the core part 2 is expanded to the diametrical direction and projected from the expanded portion 1 to form a groove for attaching rubber. After the expanded receiving port is formed on the end of the tube P2, the peripheral face of the receiving port is air-tightly surrounded by an outside mold B, and the space between the mold V and the peripheral face of the receiving port is evacuated. When the peripheral face of the receiving port is kept under vacuum condition in this way, the outer wall is expanded in the peripheral direction to obtain the receiving port of smooth peripheral face without uneven portion. |
