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AssigneeFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
InventorsAndreas Hartmann, Frank Kretzschmar, Annett Klotzbach, Lothar Morgenthal, Dieter Pollack, Thomas Schwarz
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The invention relates to a method and an apparatus for the laser machining of workpieces, a laser beam being two-dimensionally positionable with the aid of a laser machining head with respect to a surface of a workpiece and it being intended for the machining of the workpiece to take place with predeterminable contours. According to the object, it is to be possible for the forming of the contours to be realized with high positional accuracy at low cost and with little effort. To achieve this object, the laser beam is correspondingly guided by means of a laser machining head, in which at least one two-dimensionally pivotable scanner mirror is accommodated. The scanner mirror or two scanner mirrors is/are connected to an electronic evaluation and control unit. Before the actual machining, a set-actual value comparison is carried out with respect to the position of the workpiece with at least one predetermined contour with respect to the laser machining head. For this purpose, a light beam of a light source is focused and directed via one or else two scanner mirror(s) onto the surface of the workpiece and deflected along at least one axis by pivoting at least one of the scanner mirrors. The light reflected from the workpiece surface passes via the scanner mirror or mirrors onto an optical detector and is focused onto the latter. Taking into account the respective pivoting angle of the scanner mirror(s), the measuring signals of this optical detector are fed to the electronic evaluation and control unit, so that the deflection of the laser beam can be controlled during the machining in dependence on the actual position of the contour ascertained in this way for the machining.
A method for the laser machining of workpieces, in which a laser beam is directed by means of a laser machining head, in which at least one two-dimensionally pivotable scanner mirror connected to an electronic evaluation and control unit is accommodated, onto a workpiece for machining the latter with predeterminable contours and, before the laser machining, a set-actual comparison of the position of the workpiece (4) is carried out with at least one predetermined contour with respect to the laser machining head, wherein a light beam (7) of a light source (1), focused by means of the one or two scanner mirror(s) (2, 3), is directed onto the surface of the workpiece (4) and is deflected along at least one axis by pivoting at least one scanner mirror (2) or (3) and light reflected from the workpiece surface is directed in a focused manner onto an optical detector (5) via the scanner mirror(s) (2, 3);
An apparatus for the laser machining of workpieces, in which at least one two-dimensionally pivotable scanner mirror is accommodated in a laser machining head which can likewise be positioned two-dimensionally with respect to a workpiece surface, for the machining of the workpiece with a laser beam, wherein a light source (1) directs a focused light beam (7) via the scanner mirror(s) (2, 3) onto the surface of the workpiece (4) and light reflected from the surface of the workpiece (4) is directed via the scanner mirror(s) (2, 3) onto an optical detector (5);
Dependencies are inferred from the claim text.