Schuler Pressen Gmbh

Michael Richter

Juergen Fahrenbach

Jürgen Fahrenbach

Martin Gaebges

Tobias Schwarz

Michael Micklisch

Dieter Reisch

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

A method for a die casting with a casting device which includes a casting valve with a valve piston and a post-compression piston configured to provide a post-compression. The method includes providing a casting valve in a closed position and a mold cavity which is cleaned and prepared for a mold filling process, opening the casting valve for a casting, filling the casting valve with a melt, closing the casting valve after the filling with the melt, cooling the casting valve and the melt, and removing a cast part. A post-compression is provided to the melt during the cooling by the post-compression piston.

Casting valve with a post-compression piston

A casting valve configured to supply a melt of a casting device includes a valve housing including a melt channel connection as an inlet and a valve outlet as a run-out. A melt channel is configured to be pressurizable via a casting pressure. A valve compartment is configured to receive the melt. The valve compartment is connectable via the melt channel connection with the melt channel. A closing device is configured to modify a cross-sectional surface of the valve outlet. A post-compression piston is configured to post-compress the melt after a completion of a mold filling.

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Birenbach, Germany

Michael Richter