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1

Modular intelligent fixture system for flexible clamping of large parts

Möhring H.-C., Gessler W., König A., Nguyen L. T., Nguyen Q. P.

Journal of Machine Engineering

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2017

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Vol. 17, No. 4

29--39

EN

In this work a modular intelligent fixture system for flexible clamping of large parts is presented. The fixture modules consist of a hybrid material structure involving metal frame elements and mineral casting. These modules can be combined and connected to realize fixtures adapted to the geometry of the workpiece and requirements of the machining processes. By integrated pipes and interfaces, an internal hydraulic supply and active cooling is possible even for combined modules. Temperature and acceleration sensors allow for an active thermal control and process monitoring. The modules and first test fixtures are investigated in experiments.

2

Intelligent hybrid material slide component for machine tools

Möhring H. C., Wiederkehr P., Baumann J., König A., Spieker C., Müller M.

Journal of Machine Engineering

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2017

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Vol. 17, No. 1

17--30

EN

In mid-scale and large five axis overhead gantry type milling machines, the vertical z-slide (ram) often constitutes one of the most sensitive and critical components regarding stiffness, structural vibrations and thermal influences. During machining, the z-slide is loaded by (quasi-) static process and drive forces, transient acceleration forces, periodic excitations by the tool engagement, as well as by thermal effects resulting from altering ambient conditions, heated chips, cooling lubricant and power losses in drives, guides and bearings. Deflections, thermal deformations and vibrations of the z-slide lead to geometric machining errors and inacceptable surface location errors at the workpieces. Furthermore, instable cutting conditions and regenerative chatter limit applicable material removal rates and, thus, productivity. In this work, a newly developed hybrid material structure for an exemplary z-slide, involving metal parts and mineral cast, is introduced. Structural optimization methods as well as process simulation techniques were applied in order to derive the final design solution. The integration of active cooling circuits for thermal stabilization is investigated and the use of fibre optical strain sensors is analysed with respect to a state monitoring of the machine tool component.

3

Anaerobic biological degradation of carbamazepine at environmental concentrations

König A., Sorgler Y., Jekel M.

Czasopismo Techniczne. Środowisko

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2016

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Y. 113, iss. 1-Ś

45--54

EN

A removal of the antiepileptic drug carbamazepine is frequently observed under anaerobic redox conditions at managed aquifer recharge sites. The biological influence on this effect is widely unknown and therefore it is the focus of this study. Anaerobic degradation batch tests and long-term soil column experiments, conducted within this study, suggest a removal of 2 to 50% induced by microbiological processes. Transformation products and their molecular structures are suggested – one of them is clearly identified as 10,11-dihydro-carbamazepine. This study provides a deeper understanding regarding the biotic reduction of carbamazepine.

PL

Eliminacja leku padaczkowego karbamazepiny jest często obserwowana podczas sztucznego wzbogacania wόd gruntowych w warunkach beztlenowych. W poniższym artykule przedstawiono badania dotyczące dotychczas niedostatecznie zrozumiałego wpływu faktorόw biologicznych na te zjawisko. Przeprowadzone testy naczyniowe (testy batch) w warunkach beztlenowych i testy ciągłe z kolumnami piaskowymi pokazały znaczną eliminację karbamazepiny spowodowanej przez procesy mikrobiologiczne w wysokości 2 do 50%. W artykule zasugerowano produkty transformacji karbamazepiny i ich struktury molekularne – jednoznacznie zidentyfikowana zostala 10,11-dihydro-karbamezepina. Przedstawione badania umożliwiają lepsze zrozumienie biotycznego rozkładu karbamazepiny.

4

Novel synergists for flame retarded glass-fiber reinforced poly(1,4-butylene terephthalate)

Louisy J., Bourbigot S., Duquesne S., Desbois P., König A., Klatt M.

Polimery

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2013

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T. 58, nr 5

403-412

EN

Poly(1,4-butylene terephthalate) (PBT) is an important engineering thermoplastic polymer which is very often reinforced by glass fibers (GF) to improve its mechanical properties. Applications of GF-PBT could be limited due to its high flammability and flame retardants (FRs) must be incorporated into the polymer. In this work, the selected FRs are aluminum diethylphosphinate (OP 1240) and a combination of melamine cyanurate and of aluminum diethylphosphinate (OP 1200). Synergists are investigated in formulations of GF-PBT containing OP 1200 or OP 1240 according to different fire scenarios [limiting oxygen index (LOI), UL-94 and mass loss calorimetry]. It is found that polyhedral silsesquioxanes (POSS)-based molecules are synergists of interest combined with OP 1200 and OP 1240. The combination of the layered potassium acetate modified kaolin with OP 1200 also appears to be beneficial.

PL

Badano potencjalne synergetyki, działające w układzie z handlowo dostępnymi opóźniaczami palenia (FR), stosowane do uniepalniania kompozytu poli(1,4-tereftalanu butylenu) napełnionego włóknem szklanym (GF-PBT). Palność wytworzonych materiałów (FR GF-PBT) oceniano na podstawie testu palności UL-94, wyznaczonego indeksu tlenowego (LOI) oraz określonej kalorymetrycznie szybkości wydzielania ciepła (HRR). Wykorzystano w pracy handlowe uniepalniacze: dietylofosfinian glinu (OP 1240) oraz układ cyjanuranu melaminy z dietylofosfinianem glinu (OP 1200), jako nanonapełniacze stosowano natomiast: Cloisite 30B, warstwowy kaolin modyfikowany octanem potasu, talk, krzemionkę, ekspandowany grafit i trzy rodzaje silseskwioksanów (POSS). Stwierdzono, że interesujący synergiczny układ z tradycyjnymi uniepalniaczami, poprawiający odporność na palenie otrzymywanych kompozytów, tworzy poliedryczny silseskwioksan a także warstwowa glinka kaolinowa modyfikowana octanem potasu.