Method and device for manufacturing bellows pipe

Details Method and device for manufacturing bellows pipe Method and device for manufacturing bellows pipe

1989-12-29

1991-10-15

Jones, David

Metal deforming

By application of fluent medium, or energy field

With actuated tool engaging work

72 57, B21D 1510

Patent

active

050563467

ABSTRACT:
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.

REFERENCES:
patent: 2581787 (1952-01-01), Dreyer
patent: 2954064 (1960-09-01), De Mers
patent: 3083754 (1963-04-01), De Mers
patent: 3130771 (1964-04-01), Peyton
patent: 3339386 (1967-09-01), Homfeldt
patent: 3375689 (1968-04-01), Millar
patent: 4364252 (1982-12-01), Koizumi

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