Exzentrische Gelenke für parallelkinematische Werkzeugmaschinen

Abstract

Kurzfassung Die Anwendungsbreite parallelkinematischer Werkzeugmaschinen ist, trotz intensiver Erforschung und Entwicklung seit Mitte der 1990er Jahre, nach wie vor eingeschränkt. Als Ursachen dafür gelten die noch nicht wirtschaftliche Beherrschung der Bewegungsgenauigkeit sowie der begrenzte Arbeitsraum. In beiden Fällen bilden die eingesetzten Gelenke entscheidende Schwachstellen. Der Beitrag berichtet von der Untersuchung einer alternativen Gelenkbauform, mit der Defizite konventioneller Gelenke umgangen werden können.

SEAMHex - Fast 6D Additive Manufacturing using an innovative Screw Extruder applied on a Hexapod Parallel Kinematic

“…Nevertheless, for some influences, such as non-linear joint play, the approach is limited. Consequently, new eccentric joints have been developed [15,16] that provide higher positioning accuracy and much higher stiffness, when compared to conventional joints [17,18]. At the same time, they are cost-efficient and, therefore, meet the approach of simple design.…”

Stiffness evaluation of a hexapod machine tool with integrated force sensors

“…Also, contributions discussing structureintegrated sensors in parallel kinematics itself are very rare, in contrast to the mentioned rigid Steward structures that are used as force sensor [4]. On that account, the new contributions of this paper are practical evaluations to the loss of stiffness by sensor integration for a single hexapod strut as well as for the complete hexapod machine tool in comparison to an optimisation of the kinematic joints that was focus of former works [22][23][24]. First, two single struts are evaluated on a test bench by applying load and measuring displacement using touch probes (Section 2).…”