Its highlights included beam sources and manufacturing processes for ultrashort laser pulses as well as ways to systematically optimize machining processes using computer simulations. There was even a specialist booth at the fair dedicated to the revolutionary technological potential of digital photonic production.
Polygon scanner for rapid beam deflection.
Source: Fraunhofer ILT, Aachen/Wolfgang Schwager
Load and resource optimized wheel bearing manufactured using selective laser melting.
Source: Fraunhofer ILT, Aachen/Volker Lannert
Experts at Fraunhofer ILT have now developed a polygon scanner with a 20 mm aperture and a focal length of 163 mm that is capable of achieving scanning speeds of up to 360 m/s. It can treat a 100 x 100 mm² area of a workpiece in 3 seconds, and has a scanning action that moves in two directions simultaneously. One plane of movement is the progress of the laser beam as it moves through the scanner, while the high-speed up and down movement of the workpiece along a different axis represents the second dimension. Depending on the positioning of both axes, the laser can be piloted at frequencies of up to 40 MHz. This means that the full power of modern USP sources can be brought to bear on the workpiece with great effect. In order to highlight its machining speed and precision, experts used the polygon scanner to engrave a metallic calling card in a live demonstration.
Petra Nolis | Fraunhofer-Institut
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