Method for producing a pipe and apparatus for the same

Details Method for producing a pipe and apparatus for the same Method for producing a pipe and apparatus for the same

1996-04-12

1997-05-06

Larson, Lowell A.

Metal working

Method of mechanical manufacture

Gas and water specific plumbing component making

72369, B21D 706

Patent

active

056259484

ABSTRACT:
According to the present invention, in the first process, a pipe end of a long pipe is bent with a radius of curvature which is larger than a minimum radius of curvature to form a large R portion. That is to say, bending with a large radius of curvature (R) is performed to form a large R portion in a region in which cracking or excessive reduction of plate thickness of the bend outer-side portion, or buckling of the bend inner-side portion does not occur. Subsequently, in the second process, the pipe is bent with a small radius of curvature form a small R portion by pressing a pipe-end portion of the pipe from a pipe-end direction while fixedly holding the bend side wall of the pipe. In this way, it is possible to obtain an R-minimum elbow configuration irrespective of magnitude of an amount of elongation of material and further without special equipment or mechanisms, by minor modification of present equipment.

REFERENCES:
patent: 2500890 (1950-03-01), Wurzburger
patent: 2963778 (1960-12-01), Dolby
patent: 3453857 (1969-07-01), Reckard

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