beam drilling
Drilling with a laser is a thermal material removal process. Because of the high power density the material is melted and vaporized by the strongly focused beam. As a result of the vapor pressure occurring, particles are catapulted out of the hole. Depending on the hole diameter there are two different drilling methods with the laser.
The process monitoring for shoot-through control is mostly used for very expensive alloys.
- Wolfram, Molybdenum
- Tantalum, Nickel and Beryllium
- Aluminium, Titanium
- High alloy steels
Percussion drilling
Depending on the material this method is applied for hole diameters of 20 - 1200 µm. Shaft ratios (diameter/hole depth) up to 1:200 can be achieved.
Trepanning
In the case that the hole diameter is much greater than the focus, trepanning is carried out, i.e. the hole is cut practically, for example using rotating optics.
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