Moog Gmbh

Klaus Kirch

Achim Helbig

Werner Händle

Tino Kentschke

Reiner Kohlhas

The present invention relates to an extrusion press () with a press cylinder (), the press cylinder () being driven with an electro-hydrostatic control system () for a power transmission and being connected to a separate drive () for rapid traverse, with a container (), wherein the container () is connected to a hydraulic cylinder () for a power transmission and to a further separate drive () for rapid traverse, with a hydraulic cylinder () with a locking device () for driving a shearing tool (), wherein the hydraulic cylinder () is connected to the electro-hydrostatic control system (), and wherein the press cylinder () in the power transmission and the hydraulic cylinder () for driving a shearing tool () are controlled alternately via the common electro-hydrostatic control system ().

Extrusion press with electro-hydrostatic control system

An electro-hydrostatic actuator system for a press drive, having an upper piston with a press surface, which acts from a first direction, wherein the press surface of the upper piston is actuated by means of a piston rod in a hydraulic cylinder of the upper piston and traverses a first distance in a press run, and a first electro-hydrostatic actuator for driving the upper piston, comprising a first pump and a first motor generators which is controlled by a first controller. The system furthermore comprises at least one auxiliary piston with a press surface, which acts from a second direction opposite the first direction, wherein the press surface of the auxiliary piston is actuated by means of a piston rod in a hydraulic cylinder of the auxiliary piston and traverses a second distance in the press run, and a second electro-hydrostatic actuator for driving the at least one auxiliary piston, comprising a second pump and a second motor generator which is controlled by a second controller. The second motor generator is operated as a generator in the press run, thereby generating energy which is provided to the first motor generator or auxiliary piston, which are operated as motors, via the common DC bus.

Press drive with energy recovery

The present invention relates to an electro-hydrostatic system () with a hydraulic machine () which is driven by an electric motor () and has a variable volume and/or rotational speed for providing a volumetric flow rate of a hydraulic fluid, a differential cylinder () with a piston surface and with an annular surface, and at least one equalization container (), wherein the drive system () has a closed hydraulic circuit and during operation has an overpressure relative to the environment by means of the hydraulic machine () and/or a pretensioning source (), and the drive system () provides a movement of the cylinder in a first direction by means of a volumetric flow rate of the hydraulic machine () and a volumetric flow rate from the equalization container (), and provides a movement in a second direction by means of a volumetric flow rate of the hydraulic machine () and a volumetric flow rate into the equalization container (), and a power operating mode and a speed operating mode are provided with the differential cylinder ().

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Aachen, Germany

Klaus Kirch