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: 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: The invention relates to a main cylinder or compression cylinder (4) of an extrusion/tube extrusion press (1), said cylinder being located in a transversal element (2) and comprising a cylinder housing (3) with a press piston (5), which is connected to a rod (9) that projects from the cylinder housing. According to the invention, the rod (9) is configured with an integrated feed and return cylinder (12) and comprises an axial hollow bore (13) that forms a hydraulic chamber (18) and houses a sword-shaped tube (15), the latter being surrounded concentrically by an outer housing (17), thus forming an annular gap (16), which is fluidically connected to the hydraulic chamber (18). Said tube is immobilised by one end that projects from the rod (9), together with the outer housing (17) in a hydraulic connection block (14), which comprises a conduit connection that opens into the sword-shaped tube (15) and a conduit connection (23; 24) that opens into the annular gap (16).

Abstract: The invention relates to a metal extrusion press (1), in particular a horizontal metal extrusion press (1), comprising a charging device (7) for charging an ingot to be extruded (6) into an ingot receptacle. According to the invention, the charging device (7) brings an ingot (6) that is received in a charging position and held in a charging tray (18) into the centre or the axis (8) of the extrusion press in order to insert it into the ingot receptacle. The charging device (7) of said metal extrusion press comprises an ingot insertion unit (28) which contains two intercoupled motion-dependent sliding cylinders (29a, 29b). Said cylinders (29a, 29b) are fixed by their piston-rod heads (31a, 31b) to a linear guided insertion finger (25) and their cylinder bases are likewise pivotally mounted in bearing rings (30a, 30b).