Self cleaning progressive fin die with improved stripping means

Details Self cleaning progressive fin die with improved stripping means Self cleaning progressive fin die with improved stripping means

1976-06-18

1978-10-10

Gilden, Leon

Metal deforming

With cutting

By composite tool

72344, 72427, B21D 4500

Patent

active

041189680

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: 987144 (1911-03-01), Kuechenmieter
patent: 1396230 (1921-11-01), Peterson
patent: 1818332 (1931-08-01), Johnson
patent: 2369551 (1945-02-01), Feiler
patent: 2701018 (1955-02-01), Glitsch
patent: 2772735 (1956-12-01), Wakelee
patent: 2985128 (1961-05-01), Henrickson
patent: 3733879 (1973-05-01), Sellman

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