Seal head for tube expansion apparatus

Details Seal head for tube expansion apparatus Seal head for tube expansion apparatus

1993-08-16

1994-10-25

Jones, David

Metal deforming

By application of fluent medium, or energy field

Using fixed die

72 58, 294211, B21D 3908

Patent

active

053577744

ABSTRACT:
An apparatus is provided for filling a tube with fluid and for pressurizing the tube, in order to expand and form it within a die for example. The apparatus provides a high flow-low pressure fluid circuit for quickly filling and draining the tube, together with a separate high pressure-low flow fluid circuit for pressurizing and depressurizing the tube. The high pressure circuit of the apparatus comprises a shaft having a longitudinal bore communicating with a high pressure fluid source and control means; tube sealing means adjacent the forward end of the shaft for sealing the tube when the shaft is engaged with the tube and high pressure fluid flows into the tube; and shaft reciprocating means for advancing and retracting the shaft. The high flow circuit of the apparatus comprises: a forwardly open shroud, housing the forward end of the shaft when retracted and having a rearward opening slidably and sealably engaging the forward end of the shaft rearward of the tube sealing means, the interior of the shroud communicating with a high flow-low pressure fluid source and control-means; external seal means about the forward opening of the shroud for sealing an external surface adjacent an end of the tube; and shroud reciprocating means for advancing and retracting the shroud. In operation therefore: the shroud is advanced to seal the external surface; the tube is filled with low pressure fluid; the shaft is advanced and the tube sealing means engaged; the tube is pressurized; and the process is reversed to release the tube.

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