Sms Group Gmbh

Sms Meer Gmbh

Karl Herrmann Claasen

Uwe Muschalik

Hermann-Josef Klingen

Andreas Wershofen-Crombach

Valentin Gala Losada

Ekhard Siemer

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

Synchronizing cylinder for extruder

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.

Extruder and tube extruder or metal extrusion press

Growing community of inventors

Moers, Germany

Karl Herrmann Claasen