Stretch forming apparatus

Details Stretch forming apparatus Stretch forming apparatus

1987-07-17

1988-05-31

Crane, Daniel C.

Metal deforming

By use of non-deforming work-gripping clamp and relatively...

By individually non-deforming clamps

72302, B21D 1102, B21D 2502

Patent

active

047472928

ABSTRACT:
Jaws (20) and (23) on a stretch former (10) hold a metal sheet while the tension cylinders (18) and (19) stretch the metal sheet into its "yield state." In one embodiment, a bulldozer platen (33) carries a female die (32) into and out of forming contact with the metal sheet wrapped over a male die (31) carried between jaws (20) and (23). Bulldozer cylinders (35), (36), (38) and (39) are mounted in lightly spaced-apart relation to provide access to the metal forming parts of former (10). In another embodiment, a cantilever mounted transverse bulldozer beam (40) carries a female die (32). Beam (40) includes a retractable cylinder rod (46) which assists in moving die (32) into forming engagement with die (31) and, between reciprocations, can be retracted to permit unobstructed access to the metal forming interior of the machine.

REFERENCES:
patent: 2759513 (1956-08-01), Green
patent: 2961028 (1960-11-01), Bath
patent: 3034560 (1962-05-01), Matthews
patent: 3073373 (1963-01-01), Wheeler et al.
patent: 3113607 (1963-12-01), Maize
patent: 3314269 (1967-04-01), MacKenzie

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