Feintool International Holding Ag

Osterwalder Ag

Alex Wehrli

Andreas Walther

Hans-Ruedi Honegger

Michael Sollberger

Daniel Meier

Roland Hänni

Eric Luginbühl

Beat Straub

Basil Kambli

Mischa Kindler

Curdin Maissen

Peter Kunz

Andreas Dipl-Ing Walther

Bruno Stoll

The invention relates to a press device () for a powder press () for producing pellets from a compressible material, wherein the powder press () comprises a press frame () that has an upper and a lower frame portion, an upper and/or lower punch arrangement () which each comprise a tool, and a die arrangement (), which define a mold cavity into which the compressible material is introducible, and a drive unit () that is operatively connected to the punch arrangement () and/or the die arrangement (), wherein, in order to form the pellet, the upper and/or lower punch arrangement () and the die arrangement () are movable relative to one another along a pressing axis () by means of the drive unit () and are able to be pressed against one another. The press device () has multiple tool planes () that are arranged above one another, which each comprise a carrying element () and a push-in element () that is able to be received on the carrying element () and arrested, on which at least one of the tools is receivable.

Press device for a powder press and a tool changing system

The invention relates to a powder press () for producing a pressed article from a material that can be pressed, having a press frame (), an upper and/or lower punch assembly () and a die assembly, which define a molding cavity, into which the material that can be pressed can be introduced, and an electric drive unit () which is operatively connected to the punch assemblies () and/or the die assembly, wherein, in order to mold the pressed article, the punch assemblies () and the die assembly can be moved relative to each other along a pressing axis () and pressed against each other by means of the electric drive unit (). Furthermore, the operative connection between the electric drive unit () and one of the punch assemblies () comprises a toggle lever drive () which moves the punch assembly () into a pressing end position along the pressing axis ().

Powder press having toggle lever drive and electric drive

In an apparatus and a method for stripping/pushing out a punched grid and for ejecting a blanked part from a die in a precision blanking press, the force of stripping/pushing out and ejection can be adjusted independent of the knife-edged ring force and the counterstay counteracting force while reducing the mass of the knife-edged ring and counterstay pistons, increasing the stripping/pushing and ejection speeds, and at the same time simplifying the hydraulic circuit.

Apparatus and method for stripping away/pushing out a punched grid/internally formed part and ejecting a blanked part in a precision blanking press

In a method and an apparatus for reducing the cutting impact in a hydraulically-driven precision blanking press, the force necessary to reduce the cutting impact as a counterforce is generated directly in the pressure chamber of the drive piston such that the counterforce acts directly on the cutting punch and so that the design of the press can be simplified, costs can be reduced, no additional external hydraulic-mechanical means for reducing the cutting impact are needed, and so that the loads on the press and the die can be reduced.

Method and apparatus for reducing cutting impact in a precision blanking press

In an apparatus and a method for controlling the primary drive of a hydraulically driven fine blanking press, the hydraulic circuit is simplified due to the elimination of hydraulic tubes, and the amount of hydraulic fluid is reduced, while increasing the number of strokes and achieving a simple design for the press.

Device and method for controlling the primary drive of a fine blanking press

The invention relates to a precision blanking press including a top, a base and tie rods and columns that operatively connect the top and the base. The precision blanking press has a press frame with a high stiffness, low mass and simple design, the press allowing the transfer of higher cutting forces during fine blanking while safely eliminating axial play between adjustment elements and at the same time improving the operational safety.

Precision blanking press

A powder press for producing a metal powder compact comprises an upper punch arrangement and a lower punch arrangement () which accommodates the die arrangement () which forms the mold cavity () into which the metal powder is filled, whereupon the pressing process is carried out. The lower punch arrangement () is equipped with a plate () on which the die arrangement () is placed and to which plate () cross pressing devices () are fastened. Each cross pressing device () is equipped with a cross pressing punch () that can be linearly driven by a drive unit and that can be pressed into and retracted out of the mold cavity () in the cross pressing direction through an opening () in the die () which is essentially perpendicular to the pressing direction. The drive unit of each cross pressing device () comprises a linear drive unit with a fixed part fastened to the frame () of the cross pressing device () and a part which is linearly moveable relative to the fixed part, said linearly moveable part being connected to a first wedge () whose wedge surface () acts on the wedge surface () of a second wedge () that can be moved essentially perpendicularly to the first wedge () in the direction of cross pressing. This allows compacts to be produced which exhibit lateral holes, side impressions or side impressions and protrusions applied during the pressing process, whereby the forces produced in the cross pressing direction can be optimally absorbed.

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Kehrsatz, Switzerland

Alex Wehrli