Electric heating – Metal heating – By arc
Patent
1997-11-26
2000-09-05
Evans, Geoffrey S.
Electric heating
Metal heating
By arc
21912168, 2191218, B23K 2636
Patent
active
06114651&
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a laser beam apparatus for the removal of surface layers from work pieces with a beam-emitting head that is equipped with focusing optics and is capable of being guided by hand, which is connected to a laser apparatus that produces a laser beam so as to feed in light, which exhibits a direction of beam deflection that covers the laser beam laterally with a point and releases it through an exit opening on the side facing the work piece, and which has a distance retainer that renders it possible to adjust the distance of the beam-emitting head from the work piece.
A laser beam apparatus having the aforementioned features is known from the German patent document DE-C-29 43 107. The distance retainer is a frame that is present laterally from the beam-emitting head. The beam-emitting head has a point that covers the laser beam radially that is arranged at a distance from the work piece and has an exit opening. The exit opening is sufficiently large that the laser beam can oscillate on a pre-determined pathway. A focusing of the laser beam onto the surface of the work piece is not provided. The laser beam apparatus is designed for use with a CO.sub.2 laser.
Beyond that, it is known, from the United States patent application U.S. Pat. No. 3,622,743, how to use a miniaturized laser beam apparatus of low output on paper for the removal of printed letters. Laser radiation is turned on only if the point of the known apparatus is pressed on and a micro-switch is closed. Due to the oblique positioning, which is possible at all times, the point permits no sealing off at the work piece being processed, so that a removal of surface layers with greater laser power outputs is not admissible, because then greater endangerment of the operator and the environment would be present.
The realization of high mean power outputs is lacking in all mobile laser systems that are available at the present time. The high mean outputs that can be realized with the customary technology, even in a mobile and robust fashion, are, however, urgently needed in order to render acceptable surface coverage rates and processing times possible. Only in this way can a broad, especially industrial, distribution of the apparatus be accomplished.
By comparison, it is the underlying task of the invention to improve upon a laser beam apparatus having the characteristics mentioned at the outset in such a way that it can be used in conjunction with freehand guidance with great mean power outputs such that acceptable surface coverage rates or rather, processing times should be rendered possible.
This task is resolved by virtue of the fact that the distance retainer is the point of the beam-emitting head that covers the laser beam laterally, which may be supported on the work piece so as to effect a seal, that the distance retainer is the point of the beam-emitting head, which covers the laser beam over laterally, which may be supported on the work piece so as to effect a seal, that the laser beam is oscillatible by the beam deflection apparatus on a predetermined pathway by means of an exit opening of the distance retainer that is adapted to the pathway, and that the focusing optics can alter the focus of the laser beam in dependence of the beam deflection in the sense of a focus lying on the surface of the work piece.
For the laser beam apparatus, it is significant that it exhibits a distance retainer that may make contact with the work piece. The distance retainer guarantees a distance of the beam-emitting head from the work piece that can be predetermined, at the least, however, a predetermined minimum distance, so that the power output made available by the laser apparatus is brought to bear in an area of the surface of the work piece, the size of which is predetermined as well, particularly by the beam deflection apparatus. Predetermined intensity values can be adhered to with a sufficient degree of precision while utilizing the distance retainer. The laser beam apparatus can be used for various processing methods. The removal of
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Barkhausen Winfried
Buchter Edwin
Reichel Frank
Schluter Holger
Wissenbach Konrad
Evans Geoffrey S.
Frauenhofer Society for the Promotion of Applied Research
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