| 摘要 |
PURPOSE:To in-mold a resin material in the outer periphery of a tubular body by a method wherein a molded primary tubular body is set in a lower mold of a next process, a movable mold is inserted from both, right and left directions into the lower mold, a slide core provided in the periphery of an end of the movable mold is pressed and fixed to the inner peripheral surface of the tubular body in a wedge-like movement subsequent to the movement of the mold, and an upper mold is set and a resin material is injected. CONSTITUTION:A primary molded tubular body (a) is set in a recessed part 14 at the center of a lower mold 13. A movable mold 15 at both, right and left sides of the lower mold, 13 is driven by a hydraulic cylinder, so that the tip part, 16 of the movable mold 15 is brought close to and away from the tubular body (a) at the inner side of the tubular body (a). The tip part 16 is tapered, and two kinds of slide cores 17, 18 are alternately provided in the peripheral surface of the end part 16 to slide in frictional contact with the tapered end part. The slide cores 17, 18 are contracted and expanded by the movement, of the movable mold 15. When the movable mold is inserted, the distance of the slide cores 17, 18 is enlarged, thereby fixing the tubular body (a). An upper mold 10 is set with a gap above the tubular body 10 after the tubular body (a) is fixed. A resin material is injected into the gap in the periphery of the tubular body from an injection port 12, and accordingly a secondary molded tubular body is obtained. A multi-layered tubular body can be easily manufactured in this manner. |
