Metal deforming – By application of fluent medium – or energy field – With actuated tool engaging work
Patent
1995-06-05
1998-09-08
Jones, David
Metal deforming
By application of fluent medium, or energy field
With actuated tool engaging work
72 57, 72369, 72387, 294211, B21D 2602, B21D 1503
Patent
active
058028986
ABSTRACT:
An apparatus for bending a tube blank having an outer diameter, comprising: an inner bending die having an arcuate outer surface which has a first radius from an axis; a wiper shoe having an inner surface, said shoe disposed and adapted to trap a tube blank between said inner surface and said outer surface; holding means for holding a first portion of the blank against said inner die; limiting means for limiting movement of said shoe to rolling about an arc around said axis, said arc having a second radius from said axis which is approximately between said first radius and said first radius plus said diameter; and, moving means for moving said shoe around said axis, and around the blank thereby bending a second portion of the blank around said outer surface; and sealing and pressurizing means for sealing the blank and for hydraulically pressurizing the interior of the blank to a sufficient pressure to allow moving means to bend a second portion of the blank around said outer surface, said pressurized liquid acting like a flexible mandrel to ensure uniform, non-buckling deformation of the tube, substantially without distorting the cross section of the second portion.
REFERENCES:
patent: 2777500 (1957-01-01), Ekholm et al.
patent: 3650140 (1972-03-01), Zmuda
patent: 5239852 (1993-08-01), Roper
patent: 5275031 (1994-01-01), Whiteside et al.
patent: 5353618 (1994-10-01), Roper et al.
Aquaform Inc.
Jones David
LandOfFree
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