Key benefits of the HDO
- High integrability for different laser machining systems by a modular design consisting of a rotation module and processing head
- High precision of the hole shape and cutting kerf
- High aspect-ratio with a well-defined hole profile due to the selfrotation of the laser spot while moving on the helical path
- High productivity enabled by rotational speed of laser beam up to 30,000 RPM and its independency on helical diameter
- Dual wavelength coating for 500-550 nm & 1000-1100 nm for easy plug & play switches of wavelengths
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Principle of operation
The helical drilling optics consists of a beam rotator, optical components for beam tilt and parallel shift.
The laser beam is rotated around the optical axis by the beam rotator – a Dove prism mounted in a high-speed hollow shaft motor,
and the emitted laser beam spins in a circular path with respect to the workpiece surface. If the outgoing laser beam is offset or tilted
from the optical axis, a micro-hole with a certain taper or diameter is fabricated. With the control software, the diameter and taper
of the micro-hole can be changed precisely. The use of Dove prisms as image rotators has the fundamental advantage that
the drilling quality does not depend on the laser beam cross-sectional characteristics.
Also, due to the prism imaging characteristics, the outgoing laser beam rotates at twice the motor operating rate,
increasing drilling efficiency.
Main features
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Modular design
High integrability for different laser machining systems
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Rotation module
- Dimensions: LxWxH 555x370x195 mm³
- Weight: 30 kg
- Maximum beam rotation speed: 30,000 rpm
- AC hollow motor with encoder for a position, speed and temperature feedback,
water cooling optional - Fused silica optics set with dual-wavelength coating
- Achievable helical diameter: 5-1000 µm
- Achievable taper: max ±15°
- Automated control of rotator: adjustment accuracy 0.75 arcmin
- Motorized beam deflection and translation reflector
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Focusing/machining module
- Dimensions: LxWxH 145x105x280 mm³
- Weight: 4 kg
- Coaxial CMOS camera
- Real-time machining positioning and observation
- Fixed focus optics, focal lengths of 30, 60, 120, 150 mm, etc.
- Highest stability and best repeatability
- Applicable wavelengths: 355 nm, 532 nm, and 1064 nm
Helical drilling process
Drilling in 0.5 mm thick stainless steel
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Advantages of helical drilling
Based on Ø100 µm drilling in 1 mm thick stainless steel, quality prioritized
Parameter | Helilcal drilling | long pulse drilling | EDM |
---|---|---|---|
Drilling speed | 1 sec./hole | 0.3 sec./hole | 0.5 sec./hole |
Precision | < 1 µm | ~5 µm | > 30 µm |
HAZ | negligible | 5 µm | 20 µm |
Aspect ratio | 50:1 | 10:1 | 10:1 |
Conicity | -14°~15° | 3-15° | 3-8° |
Roughness of the drill wall | < 0.2 µm | 2 µm | 10 µm |
Roundness of the drill exit | > 0.95 | ~0.65 | 0.75 |
High precision microholes in stainless steel
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Entry
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Exit
Shaped holes drilling in stainless steel
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Helical drilling of micro holes with different taper
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10 μm micro holes in 100 μm titanium
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Single hole
Silicone Wafer
Overview |
Single hole |
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Entry |
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Exit |
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Helical drilling with high aspect-ratio in stainless
1 mm Material thickness |
2 mm Material thickness |
3 mm Material thickness |
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10:1 | 20:1 | 20:1 | 30:1 | 50:1 | |
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Helical cutting of sapphire glass
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