Metal deforming – By application of fluent medium – or energy field – Using fixed die
Patent
1997-03-14
1999-04-13
Jones, David
Metal deforming
By application of fluent medium, or energy field
Using fixed die
72256, 72278, B21C 3100
Patent
active
058932879
ABSTRACT:
A method and a device for forming a metal billet into an elongated product body of desired cross-sectional shape and dimension by a combination of die drawing and hydroextrusion from a pressure chamber having a central axis, holding a pressurized working liquid and being fitted with a hydroextrusion die, which are characterized by placing a drawing die of smaller cross-sectional size than the hydroextrusion die in coaxial alignment with the latter at a distance L downstream therefrom whereby the hydroextrusion die and the drawing die form a pair of dies flanking an intermediary empty region; adjusting the distance L to fit the metal and size of the elongated product body such that any stretch of an extruded body passing through the intermediary empty region retains its elastic stability; continuously extruding the billet through the hydroextrusion die to form an extruded intermediate product; continuously passing the extruded intermediate product across the intermediary empty region into the drawing die; and continuously pulling an elongated product body out of this drawing die; whereby the elongated product body is obtained with desired degrees of precision and surface quality in one operational cycle.
REFERENCES:
patent: 3747384 (1973-07-01), Nilsson
patent: 3841129 (1974-10-01), Nishihara et al.
patent: 3862557 (1975-01-01), Zeitlin
patent: 3863481 (1975-02-01), Dibrell
Genin Dmitry
Lyahovetsky Lev
Jones David
Project 3-P Precise Pipe Production Ltd.
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