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Vorrichtung und Verfahren zum schneidenden Bearbeiten von Werkstuecken mit einem Laserstrahl

Laser cutting equipment with mirror deflecting focused beam, includes additional beam movement facility to extend field of operation and increase agility
: Bartels, F.; Morgenthal, L.; Schwarz, T.; Himmer, T.

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DE 102008027524 A: 20080604
DE 102008027524 A: 20080604
Patent, Elektronische Publikation
Fraunhofer IWS ()

(B3) Die Erfindung betrifft eine Vorrichtung und ein Verfahren zum schneidenden Bearbeiten von Werkstuecken mit einem Laserstrahl. Aufgabe der Erfindung ist es, die erforderliche Bearbeitungszeit beim Schneiden zu erhoehen und gleichzeitig den Schneidgasverbrauch und den Einfluss wirkender beschleunigungsbedingter Kraefte oder Momente zu minimieren. Bei einer erfindungsgemaessen Vorrichtung wird ein Laserstrahl mittels mindestens eines reflektierenden schwenkbaren Elementes zweidimensional ausgelenkt und mit einer fokussierenden Optik durch eine Schneidduese gemeinsam mit einem Schneidgas auf die Oberflaeche des Werkstuecks gerichtet. Dabei wird eine zweiachsige Relativbewegung zwischen Werkstueck und Laserstrahl mit in einem Schneidkopf aufgenommenen Elementen durchgefuehrt. Die am Schneidkopf befestigte Schneidduese wird zur Bearbeitung eines vergroesserten Bearbeitungsbereichs, mittels mindestens eines Antriebs zusaetzlich in zwei Achsrichtungen parallel zur Oberflaeche des Werkstuecks bewegt.


DE 102008027524 B3 UPAB: 20090928 NOVELTY - The laser cutting unit is moved conventionally, relative to the workpiece (1.4). In a novel arrangement, the cutting nozzle (1.3) fastened to the cutting head (1) can also be moved in two axial directions, parallel to the surface of the workpiece. This additional movement is caused by a separate drive system. The new arrangement increases the working area of the laser cutter. The focusing optic (1.2) is a telecentric planar field optic and/or a telecentric F-theta optic. DETAILED DESCRIPTION - The cutting nozzle rotates about an axis directed at right angles to the workpiece surface. The rotational axis of the nozzle, or of its opening, is located eccentrically with respect to the longitudinal axis of the cutting head. An eccentric drive moves the cutting nozzle. A double-eccentric drive is used, with two drive motors. These are independently-controlled. The eccentric drives are connected. They are arranged one inside the other, or one above the other. Through combined nozzle movement and beam (10) deflection, the operational area achieved on the workpiece reaches at least 7 mm2. The cutting nozzle is alternatively moved by two independently-controlled linear drives. The drives used are: moving coil, pneumatic or hydraulic. The linear drives act on the cutting nozzle from the radial exterior of the unit, and are articulated to it. The laser beam and cutting gas are directed through the nozzle onto the workpiece. The nozzle opening is circular, elliptical or slot-shaped. The nozzle is held by a cross-slide assembly with linear drives to each slide. The beam deflection includes an oscillatory motion. AN INDEPENDENT CLAIM IS INCLUDED FOR the corresponding laser cutting method. USE - Agile laser cutting equipment with a mirror deflecting the focused beam. ADVANTAGE - By superimposing mechanical and optical deflections, variation of cutting direction can be achieved with smaller radii. This accelerates the cutting operation, increasing production and saving cutting gas. At the same time, stressing of the equipment by accelerations and torques is reduced. Wear is reduced and equipment life is extended. Movements of individual drives become smoother. Agility is increased without increase in the size of the gas opening, so cutting gas is conserved. The additional drives permit simpler optics to be used if required. This minimizes cost. Advantages of differing types of nozzle drives are discussed further in the disclosure. Gas flow is readily matched with the cutting requirement and either conical-cylindrical or Laval nozzles can be used.