Magnesium – Werkstoff der Zukunft

Magnesium – Material of the future In the last years the reduction of fuel consumption by reduce the car weight come to the fore. In many cases single car components will be replaced by light metals. The development of innovate automobile materials will be defined by the energy consumption, the recycling capability and profilability.     

Wolfgang Gaede ‐ Wegbereiter der Vakuumtechnik

The inventions of Wolfgang Gaede were the beginning of the extensive industrial application of vacuum technology: the 1905 invented high vacuum mercury pump simplified the production of electric bulbs. From this time Gaede joined the company E. Leybold's Nachfolger research & development activities for 40years. Three of his inventions, the diffusion pump, the (turbo‐) molecular pump and the principle of “gas ballast” are worldwide in use even today. The most important stations of Gaede's biography are reported.     

Betriebsfestigkeit in der Fahrzeugentwicklung – von der Theorie zum Produkt

Durability Evaluation in the automotive engineering – from theory to product The procedures for durability evaluation in the automotive engineering are represented, especially the methods, load assumption, fatigue testing and the regulations for the release and quality control. By practical examples of the vehicle development from chassis, aggregate and body the procedure is described, in particular the used experimental and virtual simulation methods     

Carl Hoffmann (1844 – 1910), der Erfinder der Drehschieberpumpe

Among the numerous constructions and designs of mechanical (vacuum) pumps around the turn of the 19th/20th century Hoffmanns invention of the sliding vane rotary vacuum pump may be considered as the real breakthrough in this field. His pump, manufactured since 1905 excels by the introduction of the – by now standard – back pressure valve which has been retained as an essential component in all later constructions of similar pumps, in particular of Gaede's so called “box” pump. The articel describes Hoffmann's professional life in context with the state of vacuum technology at his time.     

Alnatura Campus – Neubau der Alnatura Arbeitswelt

Alnatura Campus – building the Alnatura Working Environment The site of the former US‐Army Kelley Barracks has been extensively restored for the 55 000 m² large site of Alnatura Campus in the southwest of Darmstadt. The sealed surfaces were broken up and the resulting construction material was installed in the surrounding area. The newly constructed building of Alnatura Working Environment is the main focal point on the campus – a bright and open office building for up to 500 employees. Alnatura Working Environment is the largest office building with an innovative rammed‐earth façade in Europe with a gross floor area of approximately 13 500 m². The rammed‐earth facade regulates the indoor climate in a natural way and has a positive effect on the indoor acoustics. Various features meet the highest ecological requirements: an earth duct supplying the climate‐neutral building with fresh air from the near forest; the rainwater cistern; the photovoltaic and geothermal systems; the large rooms full of light; flexible workplaces. The entire ground floor functions as a meeting place and a communication space, thus promoting the uncomplicated encounter between the visitors and the employees. Stairs, bridges and walkways connect the curved levels, creating horizontal and vertical neighborhoods. Alnatura Campus serves further as a learning and meeting place for the local community with a restaurant on the ground floor. The nearby public herbal, vegetable and fruit gardens were established with educational purpose as well. As per Martin Haas, founder and partner of haascookzemmrich STUDIO2050: ”Alnatura Working Environment provides answers on how to plan and build buildings today: simple and resource‐neutral. The values and open organizational structures of Alnatura received an architectural equivalent hence creating identity and connecting people.”     

Werkstücktemperaturen bei der Zerspanung – Messung und Berechnung

Workpiece Temperatures in Machining - Measurement and Calculation Workpiece temperatures in machining of an austenitic steel, an aluminum alloy and copper have been both determined experimentally using infrared pyrometry and calculated numerically with a finite-difference-model. The influence of the cutting parameters such as cutting speed, cutting depth and rake angle on the workpiece temperature were investigated. Depending on the thermal diffusivity of the material an increase in cutting speed or cutting depth can either increase or decrease the maximum workpiece temperature. Increasing the rake angle always leads to decreasing workpiece temperatures.