Schuler Pressen Gmbh

Maschinenfabrik Mueller-weingarten Ag

Mueller Weingarten Ag

Muller Weingarten Ag

Schuler Pressen Gmbh & Kg

Joachim Beyer

Guenther Schaich

Marcus Kosse

Rainer Hedler

Carsten Otremba

Hans Hofele

Andreas Lauke

Ulrich Hermann

The invention relates to a press drive for a press or a press having a press drive. The invention also relates to a method for controlling the press drive by means of a control unit. The press drive is used for moving a ram of the press in a stroke direction H between an upper return point OT and a lower return point UT. It comprises a knee lever gear having a first lever and a second lever. A connecting rod engages on the knee lever of the two levers and is connected on the other end to an eccentric of an eccentric drive. The control unit can drive the eccentric drive in a first operating mode Bor a second operating mode Bor, in particular, also a third operating mode B. In the first and the second operating modes B, B, the eccentric oscillates in a respectively different angle region W, Wabout a rotation axis D of the eccentric drive, thus resulting in different force and movement states of the ram in both operating modes.

Press drive comprising two working areas

In a press having a plunger supported so as to be movable linearly back and forth by drive means which include at least one servomotor in combination with a rotatably supported inertia structure connected for rotation with the servomotor, the inertia structure has an inertia moment which is small enough to permit reversal of the servomotor within a stroke length of the plunger so that the stroke of the plunger is adjustable under the control of a control device connected to the servomotor for controlling its operation.

Mechanical press

A forming press for external high-pressure forming is proposed, in which the fluid box ( ) is arranged stationarily. Working cylinders ( ) are integrated in the ram ( ) so as to achieve a compact design, and the sheetholding and closing force is applied by short-stroke cylinders ( ).

Press for external high-pressure forming

A hydraulic drive for a press and in particular for a press for the simulation of the operating conditions of mechancial presses for large parts or the like is proposed. In order to also make such a hydraulic simulation press available for pilot lots or small lots with a considerable improvement in efficiency, a so-called hydraulic transformer, which consists of hydraulic devices adjustable in angular travel, is assigned to the drive.

Hydraulic drive for a press

A method for controlling the drive of a hydraulic press and an associated device for carrying out the method are proposed, the piston/cylinder unit belonging to a press ram being driven via several hydraulic devices connected in series. Depending on the operating phase of the press, the hydraulic devices are here used as required either as hydraulic motors or hydraulic pumps, which effect a delivery of pressure medium into the respective cylinder chamber.

Method for controlling the drive for a hydraulic press having a

A method for controlling a drive for a hydraulic press employed for at least one of forming and cutting sheets of metal. The method involves a press comprising: a press ram and at least one piston-cylinder unit operatively connected to the press ram and including a drive piston having an upper side and a lower side, the drive piston further comprising an upper cylinder chamber communicating with the upper side, and a lower cylinder chamber communicating with the lower side. The method comprises the step of pressurizing the drive piston with hydraulic medium on at least one of its upper side and its lower side for driving the press ram. The step of pressurizing comprises the steps of: supplying a system pressure network including pressure lines operatively connecting the upper cylinder chamber and the lower cylinder chamber with hydraulic medium at a predetermined maximum operating pressure from a hydraulic accumulator unit thereby equalizing pressures between the upper side and the lower side; and producing a downward movement of the press ram by extracting hydraulic medium from the lower cylinder chamber with a first hydraulic motor having an adjustable swivel angle and thereafter feeding the hydraulic medium to the upper cylinder chamber to pressurize the upper cylinder chamber thereby effecting a controlled volumetric flow of hydraulic medium through the pressure network.

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Ravensburg, Germany

Joachim Beyer