engleski

Laserforming of Metal

In its beginnings, laser forming goes back to a 1970 Japanese patent for the adjusting or relay legs. It has been a subject of industrial research since 1986. Projects in Japan were concerned with the use of laser forming for the consruction of space stations. A team in the United States worked on the forming of ship planking ; they little success since the basics had no understood. Two publications in Poland and Germany in the late 1980. s report on forming under bending conditions of sheet metals and sections with a lase beam and adjusting of discolid-off tools and threedimensional parts. Laser Irradiation in an artificially created electromagnetic radiation whose visible wave range is called laser light. Its theoretical physical description dated back to einsten in 1917, namely the principle of stimulated emission of stimulated emisssion of radiation. This is where the acronym Laser, i.e. Light Amplification by Stimulated Emission of Radiation, i derived from. N 1960, the American Maiman managed to realise the laser in an experiment for the first time. Today there are many different beam sources based on allsorts of laser-active media, for example gas lasers, dolidstate lasers, diode laser, chemical lasers, and so on. All lasers have in common a high temporal and spatial coherence of radiation. As a result, it is possible to use a focussing lens - similar to a burning glass - to focus this irradiation on an active cross-section the size of the irraditions wavelength, this makes it possible to achieve the highest radiant intensities known to us today o up to 10"19" (10 to the power of 19) W/cm"2" within this focus. Generally, however only small form changes are possible with each irradiation, for example 2 angular degrees per irradiation when 1 mm thick sheet steel is formed under bending conditions. Due to the characteristics of the process, laser forming always creates inhomogeneous stress and deformation disributions in the work piece. The beam-material interaction, which is locally limited for each moment of observation ; the movement of this interaction region along an irradiation path ; and the heat condiction into the base material more difficult, and most important reasons for this effect.

Laser; Bending

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