| 摘要 |
PROBLEM TO BE SOLVED: To provide a sealing device capable of forming by the hydroform process a thin thickness tube which cannot be processed safely with the traditional sealing device. SOLUTION: The sealing device for hydroforming characterized by the feature that a cylinder (3) for the internal surface seal enlargement whose tip end protrudes from a forcing tool outer casing in the central section of the forcing tool outer case (5) is provided, and in the tip end of the forcing tool outer casing (5), a resin seal section (2a) which surrounds the outer periphery of the cylinder for the internal surface seal enlargement and a tapered pressing attachment (1b) so as to bulge the resin seal section (2a) by drawing the cylinder (3) for the internal surface seal enlargement, are provided at the outer periphery of the cylinder for the internal surface seal enlargement which is situated in the forward position of the resin seal section (2a).
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