Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

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  • Publication
    Entschraubwerkzeuge und Demontagearbeitsplätze
    ( 1997)
    Seliger, G.
    ;
    Wagner, M.
    ;
    Staubach, H.
  • Publication
    Disassembly factories for recovery of resources in product and material cycles
    ( 1996)
    Seliger, G.
    ;
    Hentschel, C.
    ;
    Wagner, M.
    The worldwide increase of waste and restricted resources require the recycling of worn-out products. Disassembly of complex consumer products offers advantages to other recycling technologies, like material recovery and reuse of components. Current disassembly processes, however, can not cope with the increasing amount and variety of products that have to be discarded each year. The multifarious aspects of disassembly factories are addressed in an integrated project by an interdisciplinary research team at the Technical University Berlin. The closely correlated study fields are disassembly processes and tools, logistics and urban planning, product evaluation and disassembly planning as well as design for disassembly. An outline of the research program is given and the guiding theses are presented. Two example illustrate the range of the research activities. In a bottom-up approach fundamental knowledge about disassembly processes is acquired and used for the design of new tools. With t he strategy of creating new acting surfaces disassembly tools become independent of shape variations and additional changes to the products during usage. The topdown approach provides methods for the planning of disassembly factories. Grouping of product variants is used to support the design of disassembly systems. To cope with the uncertainties due to usage influences on the product, fuzzy set theory is applied for planning purposes.
  • Publication
    Modelling of geometry-independent endeffectors for flexible disassembly tools
    ( 1996)
    Wagner, M.
    ;
    Seliger, G.
    The indentation of solids in an object's surface creates new acting surface which can be used to transmit forces for handling, loosening and fixing operations. A verified mathematical description of the indentation process is presented and first results of indentation processes using impulse forces are given. A disassembly tool based on impact indentation loosens screws independent of their head shapes and with minimized reaction forces to the worker.
  • Publication
    Demontagewerkzeuge schaffen Zeit- und Kostenvorteile
    ( 1995)
    Seliger, G.
    ;
    Wagner, M.
    Produktvielfalt und nutzungsbedingte Veränderungen von Altgütern stellen hohe Flexibilitätsanforderungen an Demontagewerkzeuge. Durch neue Demontagewerkzeuge, die z. B. unempfindlich gegen geometrische Variationen eines Verbindungstyps sind, lassen sich Sensorsysteme und Werkzeugwechsel vermeiden. Am Beispiel eines prototypischen Demontagewerkzeuges für Schlauchverbindungen mit Schlauchschellen werden die Vorteile aufgezeigt.
  • Publication
    Flexible and safe automation with gripping interfaces
    ( 1995)
    Wagner, M.
    ;
    Seliger, G.
    Gripping interfaces are solids which are attached to objects to provide standardized gripping surfaces for manipulation. Gripping interfaces considerably reduce flexibility requirements for the gripper of the handling system and enable automation of difficult handling processes. Benefits of gripping interfaces can be increased by the integration of further features. Two new functions for gripping interfaces are suggested in this paper to achieve enhanced functionality. An integrated storage device permits the storing of objects on standardized receptables, hence object-specific storage equipment becomes superfluous. The integration of actuating components allows safe synchronization of gripper action and object fixtures, which is relevant for automation tasks with high safety requirements. Two examples for application are described, ranging from mass production to one-of-a-kind products.
  • Publication
    Neues Greifelement erleichtert die Automatisierung im Weltraum
    ( 1994)
    Seliger, G.
    ;
    Thom, H.
    ;
    Wagner, M.
    The great varity of experiments in automated space laboratories sets high flexibility requirements to handling devices. Thus, all handling objects are equipped with standardized gripping elements, so-called gripper interfaces. Existing gripper interfaces require active fixing mechanisms to hold the objects in place. A new gripper interface has been developed, which, among other features, possesses a special device for the temporary storage of handling objects independent of their geometry. Therefore the gripper interface is also suitable for automation tasks on earth with high flexibility and safety requirements.