Mtu Aero Engines Gmbh

Daimler Chrysler Ag

Thomas Kraenzler

Erwin Bayer

Albin Platz

Martin Bussmann

Juergen Steinwandel

Werner Scherber

Markus Haase

Horst Weller

Andreas Leupolz

Martin Stroeer

Jochen Haering

Harald Geiger

Jochen Laun

Walter Rothammel

Michael Lahres

Ulf Zum Felde

A method for manufacturing gear wheels, specifically transmission gear wheels, is disclosed. An embodiment of the method includes the following steps: a) preparation of a base body for a gear wheel, b) electrochemical processing of the base body by a precise electrochemical machining process (PECM process), where several recesses running between the teeth of the gear wheel are made simultaneously electrochemically to manufacture the teeth of the gear wheel.

Method for producing gear wheels

A method for machining workpieces provides a machining electrode, which is guided at a specific distance to the workpiece. An electrolyte is provided between the workpiece and the machining electrode, through which an operating current flows between the machining electrode and the workpiece. The operating current results from an operating voltage (U), which is produced at the machining electrode, the workpiece being connected to ground. To perform the machining procedure, the distance between the machining electrode and the workpiece is regulated and the operating voltage (U) is determined in such a way that the resulting operating current is a DC current or a pulsed DC current&#x2014;i.e., the operating voltage is a DC voltage of fixed or specific dimension. A measuring voltage (U) is superimposed on the operating voltage (U) for producing the operating current. The measuring current resulting because of the application of the measuring voltage (U) is detected and the distance between the machining electrode and the workpiece is concluded from the relationship between the measuring voltage (U) and the measuring current.

Method for machining workpieces

The invention relates to a method for the production of aero-dynamic structures during the production of integrally bladed gas turbine rotors. Aerodynamic structures of an integrally bladed gas turbine rotor are produced on a rotor disk base body, whereon the end contours are precise, by removing material according to an electrochemical removal process, i.e. by means of an electrochemical machining (ECM)-process. The method comprises the following steps: a) preparing a rotor disk base body which is made of a material which is difficult to machine; b) removing the material which is between the blade wings until a specific dimension is obtained, according to a removal process; c) preparing at least one working electrode in order to finish at least one aerodynamic structure of an integrally bladed gas turbine rotor. The contours of the or each of the working electrodes are adapted to the contours of the aerodynamic structure, which are produced by means of the respective working electrode, such that a gap between the rotor disk base body and a working electrode are produced in an approximately identical manner during the removal process of the material; d) electrochemically machining the or each aerodynamic structure in an electrochemical sinking by placing the rotor disk base body and the or each working electrode in an electrolyte and by applying voltage and/or current, whereby the applied current and/or voltage is temporally pulsed; e) pressure-rinsing the gap which is filled with electrolytes between the aero-dynamic structure and the or each working electrode by a pulsed movement of the or each working electrode.

Method for producing aerodynamic structures in the manufacturing of integrally bladed gas turbine rotors

A method for manufacturing integrally bladed rotors (preferably gas turbine rotors) is provided. The method includes the steps of a) providing a basic rotor body; b) placing the basic rotor body into an electrolyte; c) electrochemically machining the basic rotor body by simultaneously manufacturing a plurality of unmachined blades; and d) subsequently machining the unmachined blades to provide hydrodynamic surfaces, in particular a suction side and a pressure side, in the area of each unmachined blade.

Method and device for manufacturing integrally bladed rotors

An electrode and method for the electrochemical machining of a workpiece is disclosed. The electrode is designed as a cathodically polarized tool electrode. It has a geometry that corresponds to the geometry to be removed from the workpiece, at least in a machining range, and perviousnesses in the electrode to allow an electrolyte to flow through and exit at the electrode surface, at least in the area of the machining range. The perviousnesses are formed by a porous design of the electrode and/or by artificially created openings in the electrode or the electrode surface. The porosity distribution and/or the number, arrangement and configuration of the openings is selected such that a uniform electrolyte flow and/or electrolyte exchange at the electrode surface is ensured at least in the machining range of the electrode.

Electrode and method for electrochemically machining a workpiece

An electrode () is provided for electrochemical reduction of a workpiece () that is to be treated. The electrode () has a predefined contour and contains an electrically conductive material. The electrically conductive material of the predefined contour forms an electrode core (). The outside of the electrode core () is covered with an insulation layer (). The insulation layer () is porous and is made of an electrically non-conductive material.

Electrode for electrochemical reduction

A vehicle window includes a pane of self-darkening or laminated glass and a function layer made of a low-emission material disposed on an inside surface of the pane. The function layer reflects a first infrared radiation into the vehicle and reduces an emission of a second infrared radiation from the glass pane into an interior of the vehicle. In addition, a method for regulating a thermal comfort of a passenger in an interior of a vehicle includes the steps of providing a self-darkening glazing as protection against glare and heat, disposing an IR-reflecting transparent layer on the glazing in form of a coating or film, reflecting an infrared radiation emitted from the vehicle interior back into the vehicle interior using the IR-reflecting transparent layer, and reducing a heat radiated by the glazing into the vehicle interior.

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Salem, Germany

Thomas Kraenzler