The Fraunhofer Institute for Laser Technology ILT, Aachen, Germany is presenting two highlights at the LASER World of PHOTONICS China Shanghai from March 20-22. The specialty of helical optic is ultra high quality and high precision micro-machining. The extreme high-speed laser material deposition EHLA shows how the patented invention has already proved itself as an alternative to hard chrome plating and thermal spraying for metal components that must withstand powerful stresses.
Demonstration: A video at the Laser World of Photonics China Shanghai 2019 shows how quickly, precisely and efficiently EHLA works.
Fraunhofer ILT, Aachen, Germany / Volker Lannert.
Industrial applications require the precision of machining, especially for micro drilling and cutting the controllable drilling diameter and kerf width, as well as desired taper. The new Helical Optic v6s provides highest drilling and cutting quality with high controllability and reproducibility in a large variety of materials and is able to machine hardened glass, sapphire, silicon wafers and diamond.
Fully controlled drilling of boreholes
In the center of this device, a Dove prism rotates at up to 20,000 rpm. At first, this leads to a rapid rotation of the laser beam itself, allowing for an effective smoothing of the beam profile. In addition, the laser beam rotates on a circular path with an adjustable diameter.
You can also set the tilt angle of the beam, allowing full control of the aspect ratio and conicity of the borehole. Since the upcoming technology was firstly sold in 2008 as version 1, the helical drilling technology has undergone several developments in optics and systems to make it suitable for higher processing requirements.
In addition, the Helical Optics v6/v6s use a modular design and standardized interfaces with better integrability. This compact design saves 15 percent of the volume compared to the previous version, enabling the optical system to be better integrated into the laser machining center.
However, the Fraunhofer ILT booth will focus on practical examples such as the following: Right-angled helical cutting of high-performance ceramics (effective cutting speed 10 mm/min, Ra on cutting kerf less than 0.7 μm).
Alternative to hard chrome plating
EHLA, the extreme high-speed laser material deposition, is tackling another task: As an alternative to hard chrome plating, Fraunhofer ILT and RWTH Aachen University have developed this process.
The new process raises the obtainable process speed by orders of magnitude compared to conventional laser material deposition to up to 500 meters per minute. Another benefit of EHLA is that it needs much less material, as it reduces the coating thickness that can be manufactured from over 500 micrometers to between 25 and 250 micrometers.
Industrialization in China
In cooperation with ACunity, a Fraunhofer ILT spin-off, focusing on customer support and process development for laser technology, the Dutch machine integrator Hornet Laser Cladding already delivered several EHLA systems to China. “We’re continuously further developing EHLA into an even more effective and cost-efficient process,” says Thomas Schopphoven, scientist and leader of the Productivity and System Technology team in the Laser Material Deposition group at Fraunhofer ILT.
Use in the automotive industry
As one of the most prominent and promising applications, the scientist mentions the possibility of coating car brake disks using EHLA. But the technique can also be used in the aviation industry. Schopphoven explains: “EHLA is particularly suitable for the repair of landing gear components, whose anti-corrosion and anti-wear coatings also have to withstand very high stresses, similarly to brake disks.”
Videos at the Fraunhofer ILT booth (Hall 3, Booth 3101) will show how EHLA and Helical Optics works.
M.Eng. Chao He
Group Micro- and Nano Structuring
Telephone +49 241 8906-611
Dipl.-Ing. Thomas Schopphoven
Group Laser Material Deposition
Telephone +49 241 8906-8107
Petra Nolis M.A. | Fraunhofer-Institut für Lasertechnik ILT
First implementation of Gecomer®-Technology in a Collaborative Robot
21.03.2019 | INM - Leibniz-Institut für Neue Materialien gGmbH
Novel sensor system improves reliability of high-temperature humidity measurements
20.03.2019 | Universität des Saarlandes
Nano- and microtechnology are promising candidates not only for medical applications such as drug delivery but also for the creation of little robots or flexible integrated sensors. Scientists from the Max Planck Institute for Polymer Research (MPI-P) have created magnetic microparticles, with a newly developed method, that could pave the way for building micro-motors or guiding drugs in the human body to a target, like a tumor. The preparation of such structures as well as their remote-control can be regulated using magnetic fields and therefore can find application in an array of domains.
The magnetic properties of a material control how this material responds to the presence of a magnetic field. Iron oxide is the main component of rust but also...
Due to the special arrangement of its molecules, a new coating made of corn starch is able to repair small scratches by itself through heat: The cross-linking via ring-shaped molecules makes the material mobile, so that it compensates for the scratches and these disappear again.
Superficial micro-scratches on the car body or on other high-gloss surfaces are harmless, but annoying. Especially in the luxury segment such surfaces are...
The Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) at the Large Binocular Telescope (LBT) in Arizona released its first image of the surface magnetic field of another star. In a paper in the European journal Astronomy & Astrophysics, the PEPSI team presents a Zeeman- Doppler-Image of the surface of the magnetically active star II Pegasi.
A special technique allows astronomers to resolve the surfaces of faraway stars. Those are otherwise only seen as point sources, even in the largest telescopes...
Researchers at Chalmers University of Technology and the University of Gothenburg, Sweden, have proposed a way to create a completely new source of radiation. Ultra-intense light pulses consist of the motion of a single wave and can be described as a tsunami of light. The strong wave can be used to study interactions between matter and light in a unique way. Their research is now published in the scientific journal Physical Review Letters.
"This source of radiation lets us look at reality through a new angle - it is like twisting a mirror and discovering something completely different," says...
New research group at the University of Jena combines theory and experiment to demonstrate for the first time certain physical processes in a quantum vacuum
For most people, a vacuum is an empty space. Quantum physics, on the other hand, assumes that even in this lowest-energy state, particles and antiparticles...
11.03.2019 | Event News
01.03.2019 | Event News
28.02.2019 | Event News
21.03.2019 | Life Sciences
21.03.2019 | Physics and Astronomy
21.03.2019 | HANNOVER MESSE