Extrusion press and tube press and method for separating a butt

Abstract

The invention relates to an extrusion press or tube press (1), in particular for aluminum or aluminum alloys, comprising a press frame which consists of a cylinder bar and a counter bar (3) connected thereto, and in which a moving bar and a moving block receiver (2) are arranged, the moving block receiver being formed to move a block to be pressed, introduced with a loading device, into a compression position in front of the counter bar (3) having a die, characterized in that a shearing device (4) is provided for separating a butt remaining after the extrusion process, and the shearing device (4) is vertically and horizontally movable on the extrusion frame. The invention further relates to a method for separating a butt during extrusion and tube extrusion using an extrusion press or tube press according to the invention.

Claims

1. A method for separating a butt in extrusion and tube pressing using an extrusion or tube press having a counter housing, a die braced forward against the counter housing and having a rear face spaced in a rearward direction from and turned away from the counter housing, and a billet holder movable forward toward and rearward away from the rear face of the die, the method comprising the following steps: pressing a workpiece forward from a starting position toward the billet holder past the rear face of the die and through the die against the counter housing while holding a shear in a rest position proximally forward of the rear face, above the die, but not above the billet holder, thereafter retracting the billet holder rearward into the starting position spaced rearward from the rear face, thereafter horizontally displacing the shear level with the rear face, thereafter vertically displacing the shear across the rear face for shearing off a butt, thereafter displacing the shear horizontally rearward away from the billet holder; thereafter vertically retracting the shear above the die but not above the billet holder after shearing off the butt, and thereafter horizontally displacing the shear back into the rest position.

2. The method according to claim 1, wherein a horizontal displacement of at least 3 mm is performed after shearing off the butt.

3. The method according to claim 1, further comprising the step of: aligning a blade or a shearing plate of the shear parallel to the counter housing at least during the shearing operation.

4. The method according to claim 3, wherein the blade or shearing plate of the shear is aligned parallel to the counter housing during the entire process.

5. The method defined in claim 1, further comprising the step of: moving the shear only parallel and perpendicular to a direction of displacement of the billet holder in straight-line motion.

6. The method defined in claim 5, wherein a front face of the billet holder is of a greater dimension measured perpendicular to the direction of displacement than the rear face of the die.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) The invention is explained in greater detail below with reference to four figures. These figures illustrate individual steps of a method according to the invention using a device according to the invention. In the figures:

(2) FIG. 1 shows an extrusion or tube press according to the invention, having a shear in the starting position,

(3) FIG. 2 shows the extrusion or tube press from FIG. 1 according to the invention, having a horizontally displaced shear,

(4) FIG. 3 shows the extrusion or tube press from FIGS. 1 and 2 according to the invention, after shearing off a butt, and

(5) FIG. 4 shows the conclusion of the method according to the invention with the shear in its starting position.

SPECIFIC DESCRIPTION OF THE INVENTION

(6) FIG. 1 shows a schematic view of an extrusion or tube press 1 according to the invention in a starting position in which a shear 4 carrying a blade 4a is above an extrusion die 9 between a counter housing 3 and a billet holder 2. The billet holder 2 presses an unillustrated billet through the extrusion die 9 and the counter housing 3 to produce an extrusion. In this working position of the extrusion or tube press 1, the shear 4 remains in an upper position completely above the extrusion die 9 but only offset slightly toward the counter housing 3 in its starting position. The vertical and horizontal displaceability of the shear 4 in this embodiment is effected by a hydraulic displacement cylinder 7 as well as an electric drive 6.

(7) FIG. 2 shows a first step in the method according to the invention, in which the shear 4 is displaced horizontally rearward in direction X (to the right in the figure) by the cylinder 6 into a position in which the shear 4, in particular the blade 4a, is aligned with the right rear face of the extrusion die 9 on the counter housing 3 with the workpiece butt 5 projecting rearward out past the rear face of the extrusion die 9. In this phase of the method according to the invention, the billet holder 2 has been displaced rearward to the right, opposite the direction of the extrusion press, to press another billet by extrusion onto the counter housing 3 and the die after separating the butt 5.

(8) FIG. 3 shows another step in the method according to the invention, in which the blade 4a of the shear 4 has been moved downward along the arrow Y by the hydraulic cylinder 7, so that the cutting edge of the cutting blade 4a passes downward along the right rear face of the extrusion die 9 exactly parallel to the extrusion die 9 and thus shears off the butt 5.

(9) Finally, FIG. 4, like FIG. 1, again shows the starting position of the extrusion or tube press 1 according to the invention in which the shear 4 has been displaced vertically upward along the arrow Y and horizontally forward to the left along the path X into the starting position toward the counter housing 3. The cutting blade 4a is above the extrusion die 9 and thus completely frees the travel path for the billet holder 2 toward the extrusion die 9 and the counter housing 3. It is therefore not necessary to raise the cutting device 4 beyond the position shown here or to pivot the cutting blade 4a out of the vertical position shown here.