Metal deforming – By application of fluent medium – or energy field – Using fixed die
Patent
1976-12-09
1978-04-25
Gilden, Leon
Metal deforming
By application of fluent medium, or energy field
Using fixed die
72264, B21D 2210
Patent
active
040856062
ABSTRACT:
A method and an apparatus for manufacturing elongated, hollow bodies of rectangular cross section by means of hydrostatic extrusion. The method and apparatus utilize a mandrel and billet of novel construction. The mandrel cooperates with a die and has a forming tip comprising a cylindrical portion, a transition portion, and a rectangular portion. The transition portion provides a tapered surface which extends from the cylindrical portion to the rectangular portion. The billet has a leading end which is extruded first and which has a simple geometry comprising two tapered surfaces situated axially adjacent to each other and being of different taper. The billet has an axially extending hole through which the mandrel is inserted. Due to their construction and relative positioning, a hydrostatic seal is provided between the billet's leading end and the die and between the mandrel and an inner wall of the billet which bounds its axially extending hole. The uniform flow between the mandrel and die during extrusion yields a hollow, elongated product of rectangular shape whose corners are free of folds and other metal forming defects. Thus, this method and the apparatus for performing the method enables one step hydrostatic extrusion of hollow, elongated bodies of rectangular cross section with the advantages of providing excellent extrusion lubrication and complete hydrostatic sealing between the die, billet, and mandrel.
REFERENCES:
patent: 2638213 (1953-05-01), Clark
patent: 3580038 (1971-05-01), Andreassion
patent: 3712103 (1973-01-01), Malegue
patent: 3751957 (1973-08-01), Nilsson
patent: 3807032 (1974-04-01), Nilsson
patent: 3808860 (1974-05-01), Yamaguchi et al.
patent: 3946584 (1976-03-01), Yamasaki et al.
Gilden Leon
Keen J. W.
Westinghouse Electric Corporation
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