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    • 6. 发明专利
    • BELLOWS MOLDING DEVICE
    • JPS63280616A
    • 1988-11-17
    • JP11529687
    • 1987-05-12
    • HITACHI LTDHITACHI SETSUBI ENG KK
    • SUGIYAMA SENTAKEI TETSUOMISHINA YASUHIKOKIKUCHI YOSHIOKAZAMA KAZUHIROSHIMIZU YOICHISUGAWARA HITOSHI
    • B29C53/58B29C53/30B29L23/18
    • PURPOSE:To shorten the overall length of a cylindrical molding machine, lessen the deflection of the molding machine caused by the pressure of molding outer shape at the time of bellow molding and attaining high accuracy of bellow molding by providing bearing sections which slide specifically at both ends of a cylinder. CONSTITUTION:Both ends of a cylinder 6 are retained by cylinder retaining sections 12 and 13. When the side surface of a cylinder 6 is pressed by a molding outer shape 5, the cylinder 6 is transferred to the position to come into contact with a shaft 1 and clamped by the molding outer shape 5 and a molding inner shape 4. Further, when the cylinder 6 is pressed by the molding outer shape 5, plastic deformation of the cylinder surface is started by the action of the recessed section of the molding outer shape 5 and the projected section of the molding inner shape 4 to shrink the overall length of the cylinder 6. As bearing sections 10 and 11, however, slide along the shaft 1, a bellows 6C of good accuracy is molded on the side surface of the cylinder 6. Since the shaft 1 is short, the deflection of the shaft 1 is small even when the molding load is applied from the molding outer shape 5 to the shaft 1, and a belows of high accuracy can be molded. Also, as the bearing section 10 can be slided outside the shaft 1, the cylinder 6 can be on and off the shaft 1 easily.