| 摘要 |
PURPOSE:To produce a hose having a bellows part and a shape forming part without increasing a man-hour at a low cost. CONSTITUTION:A core 3 is inserted from the end face of at least one side of the cylindrical extrusion material 1 having a fixed cross section and arranged in molding dies 40, 41 having die faces 42 for forming a bellows part. At least one end part is formed through compression molding between the core 3 and the molding dies 40, 41 by performing mold clamping. Successively the extrusion material 1 is expanded in the molding dies 40, 41 and the bellows part is formed by pressing the extrusion material 1 on the die faces 42 of the molding dies. |
