Landesmesse Stuttgart GmbH
LASYS PREVIEW
“We are delighted to be back with LASYS after this long break and to build on what we achieved at the last event together with the industry”
reduced while the penetration depth remains the same, which saves energy and significantly reduces distortion. The LaVa process is now established in
many industrial areas such as electromobility, aerospace and sensor technology. The reason is that joining technology is now key in many applications, as the quality requirements for joints have increased significantly.
Dynamic Beam Laser for joining applications Dr Eyal Shekel, CEO, Civan Lasers In the past few years, the fast-growing demand for electrically operated vehicles has surfaced the need for an industry transition toward laser-based welding processes rather than conventional technologies such as arc-welding, brazing, solid-state welding, etc. The challenges are broad and versatile and concern the minimisation of parts, difficult- to-weld alloys, dissimilar-material welding, and high-speed welding challenges when processing components such as powertrains, busbars, and hairpins, to name a few. However, these challenges are dealt with by
conventional laser systems only to a limited extent that has not yet been established for mass production replacements. This, in part, is caused by the fact that conventional laser systems can control a limited set of process parameters, such as power, feed rate, and focus as the main exchangeable parameters, which are insufficient to allow better control of the welding process dynamics. Civan’s OPA-series Dynamic Beam Lasers precisely target the melt pool dynamic through shape stirring and predesigned power distribution profiles, by which defects such as porosity, spatter, humping, and cracks are avoided. The flexibility of the controlled parameters offered
In this talk, we will present the latest results achieved in high-rate laser surface texturing and functionalisation, for example, by demonstrating super-hydrophobic surfaces, shark-skin inspired riblet profiles and high-friction performances. The replication of these microscopic surface structures in plastic features a further technological improvement for mass production, which enables numerous innovations in modern micromachining and advanced surface engineering.
by OPA-series lasers (i.e., type of shape, shape frequency, focus stirring, power distribution profile, etc.) allows for the better refinement of process parameters for a specific task. This results in better optimisation of various welding processes that are of high industrial demand.
3D dynamic beam shaping for laser material processing Dr-Ing Patrick Herwig, group manager for laser cutting, Fraunhofer Institute for Material and Beam Technology IWS Macro laser material processing is no longer limited due to the availability of laser power at low costs. Currently, local overheating in the centre of the process zone does not lead to an increase in process performance, but degrades the process result due to instabilities. Additional local energy deposition in high temporal resolution provides a solution to this problem. This presentation gives an insight into the technical possibilities of an implementation as well as first insights into shifting the process boundaries. Different adaptive elements for beam oscillation in the kHz range will be discussed and improvements already achieved in the field of laser cutting and welding will be shown.
High throughput biomimetic laser surface functionalisation Bizhan Alatif, Laserinstitut Hochschule Mittweida
Mimicking natural concepts by laser surface texturing holds great promise for biomimetic surface functionalities, interfaces and products. So far, it is validated that rippled textures can function as a diffraction grating for optical effects, multi-scale laser textures can induce water-repellent and self-cleaning surface behaviour, and riblet-shaped groove structures are beneficial to reduce wall shear stress and skin friction drag on solid surfaces in turbulent flows. The ongoing trend to higher laser powers
allows high-throughput machining and large-area processing, thus paving the way for laser made surface functionalities from lab-scale research to industrial production.
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Selective laser melting in the micro scale Julian Drechsel, Laserinstitut Hochschule Mittweida The micro-SLM process established at the Laserinstitut Hochschule Mittweida (LHM) is an additive manufacturing process that scratches the surface of possibility of metallic microprocessing. The process is a further development of selective laser melting (SLM), which has already been established in industry for several years. The special features of the process, namely the small focus diameter of <30µm, the small powder grain size and the resulting low structural resolutions, enable the production of various parts in the micro range, which will be presented. Micro-SLM can be used to produce a range of structures, from watch parts to aerospace components.
Latest developments in laser-based glass additive manufacturing Katharina Rettschlag and Dr.-Ing. Peter Jäschke Additive manufacturing of glass and ceramic materials will open up new fields of application in the future, for example in chemical apparatus engineering, architecture, or even optics. Therefore, we are developing manufacturing processes further to produce reproducible and automatable glass components with a high level of complexity and optical quality. The additive manufacturing of glass, also
known as laser glass deposition, has been co-developed by us at the Laser Zentrum Hannover and enables the automated production of complex structures using a fibre-based process. The focus is on the automation of extensive handling, from handling the raw material to the finished product for standardised, reproducible results. Furthermore, we are working on the additive manufacturing of optics and optical components such as ball lenses. We can print on existing components as well as build up independent components layer by layer. To set the basis for more applications for the additive manufacturing of glasses and ceramics, we are developing and evaluating processes for materials that have not yet been used for this purpose. l
SUMMER 2022 LASER SYSTEMS EUROPE 11
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