Metal deforming – By application of fluent medium – or energy field – Using fixed die
Patent
1974-04-11
1976-03-30
Mehr, Milton S.
Metal deforming
By application of fluent medium, or energy field
Using fixed die
72 56, 72264, 72476, B21J 504
Patent
active
039465845
ABSTRACT:
A hydrostatic extrusion method and apparatus for the extrusion of tubes is disclosed wherein the simplified structure of the nose or tip portion of the billet and the cooperating surfaces of the die defining the die cavity and those of the mandrel facilitate an improved initial sealing among the associated surfaces of the die, billet and mandrel. Such an initial sealing is effected between such interfaces of the members and billet at a point which is located substantially rearwardly from the position at which the actual extrusion to the final tubular configuration occurs between the bearing portion of the die and the cooperating sizing portion of the mandrel. Such structure and method permits the extrusion of tubes having walls of asymmetric or non-circular configurations in cross section, even those of complex configurations. In order to further enhance the efficacies of the present invention, the mandrel is provided with a head portion which may be replaced, or exchanged as desired, and a position-aligning member is associated with the mandrel in order to maintain the proper orientation of the mandrel relative to the die. The mandrel may also have a specifically designed configuration in order to provide the inner surface of the tube extruded with a gloss finish.
REFERENCES:
patent: 3677060 (1972-07-01), Loqvist
patent: 3751957 (1973-08-01), Nilsson
patent: 3807032 (1974-04-01), Nilsson
patent: 3808860 (1974-05-01), Yamaguchi et al.
patent: 3817069 (1974-06-01), Hauser et al.
Ide Hideaki
Matsushita Tomiharu
Nakahara Yuuzi
Yamaguchi Yoshihiro
Yamasaki Tatsuo
(Kobe Steel, Ltd.)
Mehr Milton S.
Walkowski Joseph A.
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