Self cleaning progressive fin die with improved stripping means

Metal deforming – With cutting – By composite tool

Patent

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Details

B21D 2200, B21D 4506

Patent

active

039954692

ABSTRACT:
A progressive fin die having means for preventing metal particle buildup around the punch with the means stripping the workpiece from the punch. A plurality of draw punches are arranged with decreasing diameters in a row. A ram is movable to and from the draw punches and includes a plurality of draw bushings. Movement of the ram toward the draw punches results in the punches forming bonnets in the workpiece positioned between the punches and bushings. Spring biased stripper rods extend through the bushings and are operable to force the workpiece from the bushings. A compound pierce and straightening station includes a hollow pierce bushing mounted to the frame for receiving a pierce punch movable to and from the frame by a ram. A straightening bushing encircles the pierce punch and is externally engageable with the bonnet formed by the draw punches. A stripper bushing is slidably mounted to the pierce punch and is disposed between the straightening bushing and the pierce punch. Spring means are provided to urge the stripper bushing to force the workpiece from the pierce punch.

REFERENCES:
patent: 2701018 (1955-02-01), Glitsch
patent: 2985128 (1961-05-01), Henrickson
patent: 3733879 (1973-05-01), Sellman

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