Abstract: If a mandrel for extruding metal pipes, having two axially offset pressing surfaces with different radial characteristics and having a transition region between these two pressing surfaces has a support surface in the transition region then the negative effect of narrowing, which arises owing to the mandrel shifting from a first pressing position, in which the first of the two pressing surfaces interacts with a die, to a second pressing position, in which the second pressing surface interacts with the die, can be minimized.

Abstract: An extruder and tube extruder or metal extrusion press that has a press frame, which is composed of a cylinder bar and a counter bar connected to said cylinder bar, in which a movable block receiver holder that bears a block receiver and a movable plunger traverse are provided. A main cylinder or pressing cylinder is arranged in the cylinder bar. The cylinder receiving in its cylinder housing a pressing piston provided with a pressing plunger, and in which an equalization container is arranged in the cylinder housing. The container supplying hydraulic oil to the pressing piston by a slide plate provided on a central linkage. A filling valve that has a lid-like valve cone is formed in the transition from the equalization container to the cylinder housing.

Abstract: A double-rod ram (1), preferably for an extruder, comprising an outer cylinder (10), an inner cylinder (20) installed therein and arranged concentrically therewith, a double-acting work piston (41) provided in the inner cylinder to be displaceable and a bypass device (50) with at least one bypass valve (52), wherein the work piston (41) divides the inner cylinder (20) into two compartments (42) and can be loaded with a hydraulic fluid from both compartments (42), wherein the bypass device (50) is so arranged that in a bypass position of the bypass valve (52) a fluid connection between the two compartments (42) is formed by a direct connection, preferably at least one bypass line, and in a work position of the bypass valve (52) no such fluid connection is present.

Abstract: An extruder and tube extruder or metal extrusion press that has a press frame, which is composed of a cylinder bar and a counter bar connected to said cylinder bar, in which a movable block receiver holder that bears a block receiver and a movable plunger traverse are provided. A main cylinder or pressing cylinder is arranged in the cylinder bar. The cylinder receiving in its cylinder housing a pressing piston provided with a pressing plunger, and in which an equalization container is arranged in the cylinder housing. The container supplying hydraulic oil to the pressing piston by a slide plate provided on a central linkage. A filling valve that has a lid-like valve cone is formed in the transition from the equalization container to the cylinder housing.

Abstract: A double-rod ram (1), preferably for an extruder, comprising an outer cylinder (10), an inner cylinder (20) installed therein and arranged concentrically therewith, a double-acting work piston (41) provided in the inner cylinder to be displaceable and a bypass device (50) with at least one bypass valve (52), wherein the work piston (41) divides the inner cylinder (20) into two compartments (42) and can be loaded with a hydraulic fluid from both compartments (42), wherein the bypass device (50) is so arranged that in a bypass position of the bypass valve (52) a fluid connection between the two compartments (42) is formed by a direct connection, preferably at least one bypass line, and in a work position of the bypass valve (52) no such fluid connection is present.

Abstract: A tube or metal extrusion press has a stationary press frame formed by a main housing, a counter housing, a billet support carrying a billet holder, and a ram cross-member movable in the press frame between the housings. A piston-cylinder unit has a cylinder on the main housing, a piston in the cylinder, and a ram stem extending between a front end of the piston and the ram cross-member. An equalizing reservoir supplies hydraulic fluid to the piston, and a transfer passage extends between the reservoir and the cylinder rearward of the piston. A fill valve has a displacement sleeve on a rod and carries a ring piston and a fill valve body movable centrally of the cylinder in the transfer passage between an open position in which the passage has a large annular flow cross-section and a closed position in which the valve body blocks the passage.

Abstract: If a mandrel for extruding metal pipes, having two axially offset pressing surfaces with different radial embossing and having a transition region between these two pressing surfaces has a support surface in the transition region then the negative effect of narrowing, which arises owing to the mandrel shifting from a first pressing position, in which the first of the two pressing surfaces interacts with a die, to a second pressing position, in which the second pressing surface interacts with the die, can be minimized.

Abstract: The invention relates to extrusion and pipe presses (1), comprising a press frame consisting of a cylindrical spar (2) and a counter spar (4) connected thereto, in which a mobile billet container holder (7) supporting a billet container (8), which puts a billet (18) to be pressed, which was introduced by a loading device, into a press position in front of the counter spar (4) with the associated tool (38), and a mobile punch crosshead (6) are provided. In the cylindrical spar (2), a main cylinder, or press cylinder, is arranged, which in the cylinder housing (9) thereof receives a press piston (11), which at the front end thereof that is supported by the punch crosshead (6) is connected to a press punch (19). A compensation tank (15), which delivers hydraulic oil to the press piston (11) by way of a slider plate (28), is assigned to a main cylinder housing (9) connected to a tank line.

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.

Abstract: In a method for operating an indirect extrusion press, wherein the indirect extrusion press includes an indirect punch having a tool head that can be accommodated on the indirect punch, a closure piece, and a longitudinally movable block holder having a material block accommodation for accommodating a material block, after pressing a material block and forming a shell in a shell chamber, a tool head to be replaced is pushed out of the block holder by a tool head to be inserted, so that very operationally reliable removal of a shell formed during one or more pressing procedures is possible. For this purpose, an indirect extrusion press can have a maximal distance between a closure piece and an indirect punch that corresponds at least to the sum of the expanses of the tool head and of the block holder in the movement direction.

Abstract: The invention relates to an extruder and tube extruder or metal extrusion press (1) having a press frame consisting of a cylinder bar (2) and a counter bar (4) connected thereto, in which a movable block receiver holder (7) supporting a block receiver (8) and a movable plunger traverse (6) are provided, wherein a main or pressing cylinder arranged in the cylinder bar (2) holds in its cylinder housing (9) a pressing piston (11) that is supported at its front end by the plunger traverse (6) and is furnished with a pressing plunger (18), and wherein the cylinder housing (9) connected to a tank line is associated with a compensation container (15) supplying the pressing piston (11) with hydraulic oil by means of a pusher plate (22) provided on a connecting rod (23) connected to the rear end of the pressing piston (11), wherein the connecting rod (23) extending in the compensation container (15) is connected to a hydraulic supply arranged upstream of the pusher plate (22) in the pressing direction (14).

Abstract: If a mandrel for extruding metal pipes, having two axially offset pressing surfaces with different radial embossing and having a transition region between these two pressing surfaces has a support surface in the transition region then the negative effect of narrowing, which arises owing to the mandrel shifting from a first pressing position, in which the first of the two pressing surfaces interacts with a die, to a second pressing position, in which the second pressing surface interacts with the die, can be minimized.

Abstract: The invention relates to extrusion and pipe presses (1), comprising a press frame consisting of a cylindrical spar (2) and a counter spar (4) connected thereto, in which a mobile billet container holder (7) supporting a billet container (8), which puts a billet (18) to be pressed, which was introduced by a loading device, into a press position in front of the counter spar (4) with the associated tool (38), and a mobile punch crosshead (6) are provided. In the cylindrical spar (2), a main cylinder, or press cylinder, is arranged, which in the cylinder housing (9) thereof receives a press piston (11), which at the front end thereof that is supported by the punch crosshead (6) is connected to a press punch (19). A compensation tank (15), which delivers hydraulic oil to the press piston (11) by way of a slider plate (28), is assigned to a main cylinder housing (9) connected to a tank line.

Abstract: In a method for operating an indirect extrusion press, wherein the indirect extrusion press includes an indirect punch having a tool head that can be accommodated on the indirect punch, a closure piece, and a longitudinally movable block holder having a material block accommodation for accommodating a material block, after pressing a material block and forming a shell in a shell chamber, a tool head to be replaced is pushed out of the block holder by a tool head to be inserted, so that very operationally reliable removal of a shell formed during one or more pressing procedures is possible. For this purpose, an indirect extrusion press can have a maximal distance between a closure piece and an indirect punch that corresponds at least to the sum of the expanses of the tool head and of the block holder in the movement direction.

Abstract: The invention relates to an extrusion press or tube press (1), in particular for aluminium or aluminium 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, characterised 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.

Abstract: A tubular workpiece with a throughgoing bore is held by a handler having a passage alignable with the bore and of a predetermined inside passage diameter. A rod carrying a mandrel and of an outside rod diameter is provided with a guide having an outside guide diameter slightly smaller than the inside passage diameter but greater than the outside rod diameter The passage is aligned by the handler with the workpiece bore and the mandrel is inserted through the handler passage into the workpiece bore while sliding the guide along the passage and centering the rod in the passage with the guide out of contact with an inner surface of the passage. The workpiece is externally engage around the mandrel with forging tools and thereby forged around the mandrel.

Abstract: The invention relates to a method for extruding curved extruded profiles. The extruded profile is formed in a matrix mounted upstream in a counter beam of an extruder system and is subsequently curved or bent due to the effect of external forces and separated, supported and arranged into partial lengths in the extrusion flow by means of a separating robot connected to a higher control mechanism and is discharged to a storage area with the aid of a handling robot. The handling robot is coupled to the separating robot by means of the control mechanism and, like the separating robot, is moved into a starting position in front of the extrusion press.

Abstract: The invention relates to an extruder and pipe extruder (1), comprising a press frame (3) consisting of a cylinder bar and a counter bar (2) connected thereto, wherein a linear displaceable receiver carriage (5) is arranged, said carriage consisting of a receiver holder (6) which concentrically encompasses a block receiving element (7) and transports a block, which is charged with a charging device and which is to be pressed in a press position in front of a die associated with the counter bar (2), wherein the receiver holder (6) is maintained therein in a self-supporting manner in relation to the receiver carriage by means of air (2). The receiver holder (6) is provided with carrier webs (13) which are arranged on two sides in the middle of the press (12) and which project in a diametrically outward manner, being suspended in the recesses (14) of retaining blocks (15) of the receiver carriage (5).

Abstract: A tubular workpiece with a throughgoing bore is held by a handler having a passage alignable with the bore and of a predetermined inside passage diameter. A rod carrying a mandrel and of an outside rod diameter is provided with a guide having an outside guide diameter slightly smaller than the inside passage diameter but greater than the outside rod diameter The passage is aligned by the handler with the workpiece bore and the mandrel is inserted through the handler passage into the workpiece bore while sliding the guide along the passage and centering the rod in the passage with the guide out of contact with an inner surface of the passage. The workpiece is externally engage around the mandrel with forging tools and thereby forged around the mandrel.

Abstract: Disclosed is an extruding press (1) for billets and tubes, comprising a press frame (2) which is composed of a cylinder-type bar (3) and an opposite bar (6) that is connected thereto. A movable running bar (6) and a movable receiving device (7) are disposed within said press frame (2), the receiving device (7) displacing a block (9) that is introduced with the aid of a charging apparatus and is to be pressed in front of the opposite bar (5) encompassing a matrix. A multifunctional robot (12) which can be moved on a linear guide (11), acts independently of the movements of the press, and is equipped with a receptacle head (13) is assigned to the press frame.