Metal deforming – By deflecting successively-presented portions of work during... – By use of work-contacting wiper and moving – work-holding form
Patent
1977-08-11
1979-02-06
Combs, E. M.
Metal deforming
By deflecting successively-presented portions of work during...
By use of work-contacting wiper and moving, work-holding form
72369, B21D 905
Patent
active
041377435
ABSTRACT:
To fabricate a bent assembly of two metal tubes with one extending through and radially spaced within the other, the bending is done by inserting the smaller through the larger tube producing a tubular work assembly, clamping a leading work portion onto a bending forming die with the inner tube eccentric in the region to be bent against the die-adjacent inner wall portion of the outer tube, bending the region trailing the clamped portion by wrapping onto the bending die, while at (and immediately preceding) the point of feed onto the die the tubes are supported against collapse by a cylindrical mandrel in the smaller tube and a mandrel of crescent cross-section interposed between the large and small tube, in the plane of bending providing reaction support by a slideshoe bearing against the outer tube diametrically remote from the die; the mandrels being axially shiftably supported.
REFERENCES:
patent: 3343250 (1967-09-01), Berto et al.
patent: 3546917 (1970-12-01), Paine
patent: 4009601 (1977-03-01), Shimizu
patent: 4063441 (1977-12-01), Eaton
Combs E. M.
Striker Michael J.
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