Load-oriented lightweight structures are commonly designed based on topology optimization. For machine tool parts, they enable the reduction of moving masses and therefore increase the resource and energy efficiency of production systems. However, this usually results in complex part structures that are difficult or impossible to produce using conventional manufacturing methods. In this paper, a hybrid layer laminated manufacturing (LLM) method is proposed enabling manufacturing of topology-optimized machine tool parts. The method is referred to as hybrid, as the subtractive structuring of metal sheets is combined with the additive joining of the sheets by adhesive bonding. This enables enclosed inner cavities without support structures, which are used to approximate the optimal density distribution from a topology optimization via manufacturing. The proposed LLM method is validated on the basis of a bearing block of a ball screw feed drive. A experimental study in the time and frequency domain on a test rig confirms the principle suitability of the LLM method for the production of industrial applicable lightweight components.
Der Einsatz von Industrierobotern erlaubt auch kleineren Betrieben die Automatisierung verschiedener Bearbeitungsschritte. Daraus resultierende Möglichkeiten für die flexible Kleinserienfertigung stellen jedoch gleichzeitig große Anforderungen an die Werkstückaufspannung. Dieser Beitrag stellt ein Konzept für eine vollautomatische Werkstückfixierung vor, welche die Bearbeitung von großflächigen Schalenelementen aus leicht zerspanbaren Werkstoffen durch Umpositionieren von Vakuumgreifern während der spanenden Bearbeitung ermöglicht.
The use of industrial robots enables small-sized enterprises to automate various processing steps. The possibilities for flexible small series production result in great demands being placed on workpiece clamping. A concept for fully automatic workpiece fixturing is presented to enable the manufacturing of large-area shell elements that are made of easily machinable material by dynamic repositioning of vacuum grippers during machining.
Industrieroboter bieten eine große Flexibilität und einen großen Arbeitsraum bei verhältnismäßig geringen Investitionskosten. Gegenüber spanenden Werkzeugmaschinen sind die Steifigkeiten und Bahngenauigkeiten von Robotern jedoch geringer. Dennoch bieten sie für die Holzbearbeitung großes Potential, da die Prozesskräfte gewöhnlich kleiner und die Toleranzen höher sind als im Metallbereich. Dieser Beitrag stellt einen Vergleich der erzielbaren Bauteilqualitäten bei der Holzbearbeitung mit Industrierobotern und Bearbeitungszentren vor.
Industrial robots provide great flexibility and a large working area at relatively low investment costs. However, their stiffness and path accuracy are generally lower compared to machine tools. Still, they offer high potential for woodworking, as the process forces are usually smaller and the tolerances higher than in the metal industry. This paper presents a comparison of the achievable component qualities in woodworking with industrial robots and machining centers.
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