Method and apparatus for manufacturing bellows pipe

Details Method and apparatus for manufacturing bellows pipe Method and apparatus for manufacturing bellows pipe

1990-02-09

1991-04-16

Jones, David

Metal deforming

By application of fluent medium, or energy field

With actuated tool engaging work

72 57, 72 61, B21D 1510

Patent

active

050072676

ABSTRACT:
A bellows pipe is manufactured from a raw pipe, with an elastic body pinched between a movable core and a fixed core inside the raw pipe, by compressing the elastic body by axially moving the movable core to form an annular convex portion in the raw pipe, changing the annular convex portion to a bellows portion by axially moving a punch to press the annular convex portion, pinching the bellows portion between a chuck and a chuck inner block assembled therein, shifting the pipe a given distance by axially moving the chuck and chuck inner block holding the bellows portion therebetween, and repeating the foregoing steps. Therefore, a small-diameter raw pipe of smaller than 16 mm diameter can be deformed, the outer diameter, pitch, etc. of a bellows portion can be freely set, the elastic body is worn little.

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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