Process for bending a metal tube to a small radius of curvature

Details Process for bending a metal tube to a small radius of curvature Process for bending a metal tube to a small radius of curvature

1994-02-15

1996-01-16

Larson, Lowell A.

Metal deforming

By deflecting successively-presented portions of work during...

By use of work-contacting wiper and moving, work-holding form

72310, 72369, B21D 905, B21D 901

Patent

active

054838096

ABSTRACT:
A bent metal tube of high quality having a bend formed with a small radius of curvature, and not having any flattened, cracked, broken, folded, or otherwise defective wall portion, and a bending process which can make the same efficiently. The tube has along the inside corner of its bend a thickened wall portion having a thickness of 2.0 t to 1.5 t (t is the wall thickness of work), and a pair of transitory wall portions formed on both sides, respectively, of the thickened wall portion, and each having a gradually decreasing thickness approaching the wall thickness t of the work, and a length which is at least equal to 1/3 D (D is the diameter of the work), while the bend has an outer peripheral configuration which is substantially equal to that of the work. The bent tube is formed from the work secured near one end thereof by a first clamp consisting of a pair of members and having a pipe guide groove, while the work is fitted about a core positioned in the guide groove and having an end defining a guide surface. The work is loosely held near the other end thereof by a second clamp consisting of a pair of members and having a guide groove in which the work is loosely fitted. The second clamp is rotated, while the work is axially pushed at the other end thereof by a pressure cylinder, whereby the work is bent along the guide surface and the guide groove.

REFERENCES:
patent: 2873786 (1959-02-01), Fuchs, Jr.
patent: 2976908 (1961-03-01), Ferguson
patent: 2996100 (1961-08-01), Newhall et al.
patent: 4959984 (1990-10-01), Trudell et al.
patent: 5129247 (1992-07-01), Johnson

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