| 摘要 |
PROBLEM TO BE SOLVED: To provide a bending apparatus, by which a bend part of a pipe is bent at curvature as small as possible, and crushing or buckling is hardly caused at the bend part. SOLUTION: The bending apparatus is provided with: a bending die 2 of a pipe 1; a clamping die 3, which turns while sandwiching the pipe 1 between the bending die 2 and itself; a pressure die 4 pressing down the pipe 1; and a core metal 6, which is inserted into the pipe 1 to keep the shape of a bend part 8. The core metal 6 is made to be a spherical core metal 6a that is rotatably supported through an arcuate arm 6b at the front end of a core metal holder 6c. COPYRIGHT: (C)2006,JPO&NCIPI
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