In this way, the workpiece is held gently, can be machined precisely and is protected from vibrations. The new fixation technology has already been tested in the aircraft industry and will be presented by the scientists at the Hannover Fair, from April 19th to 23rd. The Saarland research booth C44 is located in Hall 2.
A flip of a switch is enough to convert the oily, honey-like liquid into a firm and tough substance with the appearance of dried-out clay. This effect is a special property of so-called magneto-rheological fluids. Most of them are silicon or mineral oil suspensions with an even distribution of ferrous particles. By exposing the fluids to a magnetic field the particles immediately orient themselves in the direction of one of the poles. "This effect has been known for more than 50 years. To use it in an industrial context for the fixation of workpieces, it was necessary to solve several problems", explains Harmut Janocha, professor for Process Automation at Saarland University.
His team investigates how the substances can be used to fix workpieces and how they can be implemented in other applications. The research also focuses on how to create an optimised magnetic circuit for different applications. In the European funded cooperative project Maffix, it has been possible to implement and test the new technology in the aircraft industry. Until now it was necessary to clamp titanium frame members, used to stabilize the body of the aircraft, in a complex way before machining. Titanium has the property to easily retract to its original form (memory effect), making it impossible to correct even the smallest, unwanted deformation.
"By using our fixation system the steps involved in the process could be shortened in a significant way, since the frame members could be inserted into the liquid without any additional fixation elements. The fixation now only requires half the time", added Professor Janocha. Due to this fact the production process has been improved enormously, since fixation of the workpieces took up more than half the overall time of processing. "Now it is possible to process the workpieces in a gentler way, since they are protected against vibrations during milling and bevelling", pointed out Janocha.
The European Maffix project, which was funded until October 2008 with about one million Euro, included cooperation with the Fraunhofer Institute for Silicate Research in Würzburg, as well as companies from Spain, Germany, Italy and Romania. The task of the research project was to develop novel fixation systems for workpieces with the help of this special fluid.
Producing electricity during flight
20.09.2017 | Albert-Ludwigs-Universität Freiburg im Breisgau
Solar-to-fuel system recycles CO2 to make ethanol and ethylene
19.09.2017 | DOE/Lawrence Berkeley National Laboratory
Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.
A warming planet
Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.
The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
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22.09.2017 | Life Sciences
22.09.2017 | Medical Engineering
22.09.2017 | Physics and Astronomy