Working method for loading an extrusion billet and metal extrusi

Metal deforming – By extruding through orifice – Work supplying

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Details

72272, 72263, B21C 3300

Patent

active

056576617

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a work method for loading an extrusion billet by means of a billet loader into the billet chamber of a metal extrusion press. The invention further relates to a metal extrusion press for extruding shaped sections through a die by means of an extrusion ram.


DESCRIPTION OF THE PRIOR ART

Metal extrusion presses for the production of shaped sections are known, being described, for instance, in the prospectus of Mannesmann Demag Huttentechnik entitled: "Extrusion press for aluminum sections with controlled prestressed press frame". These known metal extrusion presses have a die, arranged fixed in a machine frame, which has the cross section of the shape to be extruded, as well as a billet loader, also mounted fixed on the machine frame. A billet chamber is provided between the die and the billet loader. The billet loader can be swung from a position alongside the machine frame into a loading position in which the extrusion billet which has been moved up can be inserted into an billet chamber. This is done by means of the extrusion ram, fastened to a ram cross member, which, with the billet loader swung inward, pushes the extrusion billet into the billet chamber and, upon the further working stroke, with the billet chamber resting against the die, presses the metal through the die.
For the removal of the extrusion residue, it is necessary and customary in known metal extrusion presses to move the billet chamber back from the die in order to provide between the two of them a distance which is necessary for cutting off the extrusion residue with extrusion residue shears. During the backward movement of the billet chamber, the billet loader is positioned in the rearward swung position so that the billet chamber can pass through this region unimpeded. After the removal of the extrusion residue, the billet chamber is moved back towards the die into its starting position, whereupon the billet loader is swung in with a new extrusion billet and the press is again loaded by filling the billet chamber.
The known machines have the disadvantage that the loading process for a new extrusion billet can only start when the billet chamber is in the so-called applied position, directly in front of the die. Since the productivity of a metal extrusion press is dependent essentially on the non-productive times of the press, and therefore the positioning times of the units, the removal of the extrusion residue, the loading of new extrusion billets, etc., a shortening of the non-productive time would result directly in an increase in production.
From EP-A-04 86 436, a billet loading device for a metal extrusion press is known in which the billet chamber at the extrusion end moves opposite the extrusion direction to a distance from the die and the extrusion ram simultaneously moves out of the billet chamber. The extrusion residue is then sheared off from the die.
For the insertion of a new billet, the ram in this device is moved transversely into a position to the side of the extrusion axis. A separate driven push rod is then provided for the insertion of the billet.
Another billet loading device is known from U.S. Pat. No. 2,919,039. In that case, the billet loader is arranged within the press directly on the billet chamber holder and is provided with a push-in lever which pushes the billet into the billet chamber. The extrusion ram can be moved only when the loader is swung out.
Proceeding herefrom, the purpose of the present invention is to provide a work method for the rapid loading of a metal extrusion press as well as a metal extrusion press for carrying out this work method with which the total non-productive time is considerably reduced.
The work method of the invention by which this object can be achieved includes the following steps: extrusion to a distance from the die; positioned to the side of the extrusion line is moved, together with a new extrusion billet in direction opposite the extrusion direction and at the same time in the direction towards the extrus

REFERENCES:
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patent: 3416349 (1968-12-01), Kent et al.
patent: 3592032 (1971-07-01), Stromblad
patent: 3818745 (1974-06-01), Pollack et al.
patent: 4326399 (1982-04-01), Doudet
patent: 4895506 (1990-01-01), Nonini et al.
patent: 5247821 (1993-09-01), Bertoli
patent: 5335528 (1994-08-01), Cristiani

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