Prelatec Gmbh

Herbert Walter Werkzeung- Und Maschinenbau

Mafell-saschinenfabrik Rudolf Mey Gmbh & Co. Kg

Herbert Walter

Gisbert Staupendahl

Rudiger Haas

Ernst Krauss

The present invention is a method and system for the drilling of holes in a workpiece within a diameter range of 20 &#x3bc;m to 500 &#x3bc;m by means of laser radiation. The invention utilizes the beam quality of a laser beam as well as: the polarization of the laser radiation; the parameters of the impulses of the laser used; and, the type and pressure of the process gas used. The method and system utilize means for focusing laser radiation, in particular the ratio of the beam diameter at the site of the focusing element and its focal distance, and wherein the focusing is done in coordination with the beam quality number and wave length and other factors. A first working gas supports the formation of the hole shape and accelerates the drilling process; and, a second working gas is utilized to improve the surface quality of the drilling walls.

Method for boring bottle-like holes having a defined geometry by means of pulsed laser radiation

A method for electroerosive machining of metal workpieces and related apparatus. The erosion head of an electroerosive machining apparatus is moved with a blank clamped in it to a machining device for machining the blank with a machine tool held in the machining device, preferably a rotating milling tool the erosin head, and moves the blank for machining relative to machine tool as directed by a control computer. The machining device is located below the erosion head, with a vertical or horizontal axis of rotation, the electrode, following its manufacture, form the blank, is moved while still held by the erosion head to the electroerosive machining apparatus. Alternatively, an additional clamping device can be provided constructed like the erosion head for holding an electrode blank for machining by the machining device, while a workpiece is machined by electroerosion using an electrode held by the erosion head.

Electrical discharge process and machining apparatus

In uninterrupted and neat machining of a workpiece or material, particularly extremely hard material, with an ultrosonic tool is obtained by keeping constant or substantially constant the contact pressure between the tool and the worked surface. This is done, for example, by feeding the tool by means of a spindle sleeve which is mounted for displacement in a feed head. The other end of the spindle sleeve, remote from the tool, is designed as the piston of a feed mechanism. By keeping the pressure P1 in the cylinder space above piston, or the volume of this cylinder space, constant, the contact pressure of the tool remains constant as desired. Since the piston displaced during the matching operation, this displacement must be determined, by means of a displacement pickup, for example. Through a very sensitive contact pressure control on a feed head of the working machine, to which the cylinder of the feed mechanism is secured, can be moved to keep the volume of or pressure in the cylinder space constant.

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Fluorn-Winzeln, Germany

Herbert Walter