Robert Bosch

Roland Bleher

Eberhard Maier

Benjamin Schweizer

Peter Voehringer

Uwe Gordon

Detlev Potz

Achim Brenk

Thomas Kuegler

Manfred Mack

Wolfgang Klenk

Gerhard Mack

The invention relates to a method for the rapid manufacture of a three-dimensional workpiece from a molten material (), in particular a molten metal, in which method the molten material () is supplied to a compression chamber () and delivered in drop form via an injector hole () by means of a pressure pulse which is generated with the aid of a reciprocating piston () that delimits the compression chamber (). According to the invention, the compression chamber () is degassed before manufacturing begins and/or during a pause in the manufacturing. In a first step, ultrasonic waves are coupled into the molten material () in the compression chamber (), which generate a force (F) that makes the gas in the molten material () sink, and in a second step, after the ultrasonic excitation has ended, the piston () is introduced deeper into the compression chamber () in order to remove the rising gas via a conduit () of the piston (). The invention also relates to a device for carrying out the method according to the invention.

Method and device for rapid three-dimensional workpiece from a molten material

The invention relates to a method for the additive manufacturing of a three-dimensional workpiece from a liquid material (), in which method the liquid material () is fed to a displacement chamber () and discharged in drop form via a jet hole () by means of a pressure pulse which is generated with the aid of a reciprocating piston () delimiting the displacement chamber (). According to the invention, in order to optimise the wetting properties of at least one surface () which delimits the displacement chamber () and/or the jet hole (), sound waves are coupled into the liquid material () for a limited period of time with the aid of the piston () which is caused to vibrate for this purpose. The invention also relates to a device for carrying out the method according to the invention.

Manufacturing of a three-dimensional workpiece from a liquid material

In an injection nozzle for a fuel injection system, the opening stroke of the nozzle needle is to be limited selectively, so that different injection cross sections can be employed. To that end, the injection nozzle is provided with a nozzle body, a nozzle needle displaceable in the nozzle body, two groups of injection ports, which are uncovered as a function of an opening stroke of the nozzle needle, a piston that is connected to the nozzle needle, a stop chamber in which the piston is disposed and which is provided with an outlet, and a control valve that can open and close the outlet of the stop chamber, as a result of which the stroke of the piston in the stop chamber and thus the opening stroke of the nozzle needle can be selectively limited.

Injection nozzle

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Stuttgart, Germany

Roland Bleher