ton, CT). The company’s TruMicro series 5000 picosecond laser systems excel at hole drilling in injection nozzles for automotive and turbine blades for aerospace applications. The TruMicro 5000 short-pulse lasers offer pulse durations under 10 ps, as well as one model rated at 800 femtosecond (fs) pulse duration. “Picosecond lasers have come quite a way down in costs,”


Weiler said. “On the high-quality side, if you use picoseconds, there it’s really more ablation. You get the highest quality on 100-µm holes, and you need that on injection nozzles. It com- petes with EDM, not only in quality, accuracy and time, but also on price. The cost per part is incredibly low.” An advantage in drilling with these lasers is the quality offered by ablation, with virtually no HAZ. “It’s more or less direct vaporization,” Weiler said. “In the real world, there’s always a little heat, but with picosecond lasers, there is very little HAZ.”


Drilling strategies vary, but Weiler said percussion drill- ing makes sense when the aspect ratio is low, say with a


300-µm hole and material that is 300-µm thick. “If it’s a 1:10 aspect ratio, it’s not possible with percussion drill- ing,” he said. “With trepanning, you move the laser, and it’s like you’re steering inside of the hole. In addition, you can do the so-called helical drilling, which allows you to make undercuts.” ME


Want More Information?


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Web site: www.muc.miyachi.com


Prima Power Laserdyne Ph: 763-433-3700


Web site: www.primapower.com Trumpf Inc.


Ph: 860-255-6000 Web site: www.trumpf.com


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November 2013 | ManufacturingEngineeringMedia.com 77


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