Processes and devices for the drawing of tubes by extrusion

Details Processes and devices for the drawing of tubes by extrusion Processes and devices for the drawing of tubes by extrusion

1983-07-01

1985-06-11

Bray, W. D.

Metal deforming

By extruding through orifice

Utilizing internal forming means

722735, B21C 2700, B21C 3506

Patent

active

045220522

ABSTRACT:
A process and device for drawing tubes by extrusion of a metal billet (4) placed in a receptacle (50) within which ramming of the billet (4) is carried out by first pushing the latter against a ramming insert (63) closing the receptacle (50), then perforating the billet by means of an axial mandrel (7), and finally replacing the ramming insert (63) in the axis of the receptacle (50) by an insert (65) holding a die. Drawing is carried out by extrusion of the billet. During ramming of the billet (4), a boss (41) is formed on the face of the latter turned towards the ramming insert (63) which is inscribed within an orifice (66) in the die and which has a plane face centered on an axis diverging from the drawing axis. The ramming insert (63) is provided for this purpose with an impression (8) which has recessed the desired shape. During perforation of the billet (4), the advance of the mandrel (7) is blocked before it reaches the bottom of the dish (8) so as not to perforate the boss (41), and, after the ramming insert (63) has been replaced by the die-holder insert (65), the mandrel (7) is advanced in the die, detaching the boss (41) without carrying along the bottom of the latter, which remains attached by one edge (42) to the billet (4) because of its offset in relation to the mandrel.

REFERENCES:
patent: 3370449 (1968-02-01), Lomas
patent: 3528275 (1970-09-01), Sibler
patent: 3738144 (1973-06-01), Doudet
patent: 4345450 (1982-08-01), Doudet
patent: 4365497 (1982-12-01), Asari
patent: 4399676 (1983-08-01), Noyori et al.
patent: 4424696 (1984-01-01), Asari et al.

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