Process and device for extruding hollow sections

Details Process and device for extruding hollow sections Process and device for extruding hollow sections

1979-03-14

1980-09-23

Larson, Lowell A.

Metal deforming

By extruding through orifice

Utilizing internal forming means

72264, 72266, 72269, 72271, B21C 2301, B21C 2500, B21C 2904, B21C 3100

Patent

active

042235480

ABSTRACT:
A process for the extrusion of tubes or similar hollow sections from a billet is disclosed within the billet is forced against a hollow extrusion die surrounding a mandrel and a mandrel support. A core passing through the extrusion billet moves in the direction of extrusion with the billet and is led through the mandrel into the space inside the resultant hollow section. The process of the present invention relieves the die of the high stresses which can otherwise lead to early failure of the die.

REFERENCES:
patent: 2337804 (1943-12-01), Dempsey
patent: 2491897 (1949-12-01), Lorant
patent: 3213662 (1965-10-01), Lenz
patent: 3455137 (1969-07-01), Edgecombe
patent: 3675457 (1972-07-01), Groos
patent: 3798954 (1974-03-01), Asari

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