Apparatus for limiting the working stroke of a press ram

Details Apparatus for limiting the working stroke of a press ram Apparatus for limiting the working stroke of a press ram

1975-01-24

1976-04-06

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72417, B21D 2414

Patent

active

039480755

ABSTRACT:
Press apparatus including a blank holding ram and a drawing ram which are reciprocally driven such that the holding ram can hold a blank of material while the drawing ram moves relatively to the holding ram to perform a drawing operation on the blank. Stops are provided for limiting the movement of the holding ram with pressure fluid cushions being arranged in the drive train for the holding ram so as to accommodate a dwell phase with the holding rams against the stops during the drawing operation.

REFERENCES:
patent: 2672836 (1954-03-01), Ernst
patent: 2872886 (1959-02-01), Longfield
patent: 3180634 (1965-04-01), Heiser
patent: 3279780 (1966-10-01), Williamson
patent: 3375001 (1968-03-01), Hennells
patent: 3490757 (1970-01-01), Haanes

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