Metal deforming – By application of fluent medium – or energy field – Using fixed die
Patent
1976-05-07
1977-08-09
Lanham, C.W.
Metal deforming
By application of fluent medium, or energy field
Using fixed die
72260, 72264, 72DIG31, B21C 2508, B21C 2304
Patent
active
RE0293440
ABSTRACT:
There are disclosed herein a method and an apparatus for manufacturing tubes or tubular bodies by means of hydrostatic extrusion, which tubes or tubular bodies have axially running holes therethrough having cross-sections of irregular shapes. The method and apparatus utilize a mandrel of novel construction which comprises a conical tip portion having a smooth peripheral surface, a cut or grooved intermediate portion with a sloped groove starting at a peripheral edge and a body portion formed with a flange and adapted to move longitudinally of a pressure chamber, as necessary. The conical tip portion is specifically intended to seal against the conical end of a metallic billet. Unless there is such a provision, there would be leakage of a fluid through the grooved portion because of direct contact of the grooved edge with the inner end surface of the billet. Thus, this method and the apparatus for performing the method enables one-step extrusion of tubes or tubular bodies having inner fins or inner walls having irregularly shaped cross-sections, with the accompanying advantages of providing complete sealing among the die, the billet and the mandrel, particularly in the initial stage of the extrusion.
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patent: 3751958 (1973-08-01), Nilsson et al.
patent: 3807032 (1974-04-01), Nilsson
patent: 3946584 (1976-03-01), Yamasaki et al.
Hasegawa Hakumi
Matsushita Tomiharu
Nakagawa Jun'ichi
Noguchi Masataka
Yamaguchi Yoshihiro
(Kobe Steel, Ltd.)
Gurley D. M.
Lanham C.W.
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