The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 1985
Filed:
Jul. 01, 1983
Michel Doudet, Epone, FR;
Clecim, Courbevoie, FR;
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it reaches the bottom of the dish (8) so as not to perforate the boss (41), and, after the ramming insert (63) has been replaced by the die-holder insert (65), the mandrel (7) is advanced in the die, detaching the boss (41) without carrying along the bottom of the latter, which remains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.