| 摘要 |
A bellows pipe is manufactured, with an elastic body pinched between a collar and a stopper inside a raw pipe being deformed, by pressing the elastic body as to expand radially such that a circumferential portion of the pipe changes to an annular convex portion, pinching and compressing the annular convex portion by a chuck and a punch to form a bellows portion, and shifting the pipe a given distance while pinching the bellows portion by the chuck. A plurality of bellows portions are successively formed in the pipe by repeating the foregoing deforming steps. Thus, a device for manufacture of the bellows pipe comprises a core member secured at one end to a support member, a collar slidably fitted on the core member, a stopper secured to the core member, an elastic body slidably fitted on the core member between the collar and the stopper, a chuck having parallel arms for pinching each bellows portion, a punch loosely fitted on the pipe, and driving cylinders for driving and shifting the collar, chuck, and punch.
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