Schuler Pressen Gmbh

Schuler Pressen Gmbh + Co. Kg

Michael Micklisch

Michael Richter

Dieter Reisch

Markus Müller

A hydraulic drawing cushion () for a drawing press () includes at least one hydraulic cylinder () comprising a piston rod () that causes a total force (G) to act on the metal sheet holding ring (). The hydraulic cylinder () comprises a hydraulic work circuit () to generate a hydraulic work force (A) in a work direction (Z) to act on a ring part () to which a force can be applied on both sides. Independently, a spring force (F) acts on the piston (). The spring force (F) is neither controlled nor adjusted, but is preset. Preferably, the spring force (F) is exclusively a function of the position or location of the piston () relative to the cylinder housing (). The total force (G) acting on the piston () results from the addition of the vectors of the work force (A) and the spring force (F).

Hydraulic drawing cushion of a drawing press and method of operating the hydraulic cushion

The invention resides in a hydraulic cylinder () for a hydraulic drawing cushion () of a drawing press (). The hydraulic cylinder () includes a first operating chamber (), a second operating chamber (), and a third operating chamber (). An annular piston () with a first piston surface area () and a second piston surface area () separates the first operating chamber () from the second operating chamber (). The first and the second piston surfaces () have the same size. A front surface of the piston rod () forms a third piston surface () which is larger than the first and second piston surfaces. The third piston surface () delimits the third operating chamber () of the hydraulic cylinder (). The first and the second operating chambers () are provided for controlling the position and/or the movement of the piston rod (). The third operating chamber () serves to control the metal sheet clamping force of the drawing press via the piston rod ().

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Göppingen, Germany

Michael Micklisch