Browsing by Keyword "Machine tool"
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Item Design of piezo-based AVC system for machine tool applications(2013-03) Aggogeri, F.; Al-Bender, F.; Brunner, B.; Elsaid, M.; Mazzola, M.; Merlo, A.; Ricciardi, D.; De La O Rodriguez, M.; Salvi, E.; ROBOTICA_AUTOMAThe goal of machine tools for Ultra High Precision Machining is to guarantee high specified performances and to maintain them over life cycle time. In this paper the design of an innovative mechatronic subsystem (platform) for Active Vibration Control (AVC) of Ultra High Precision micromilling Machines is presented. The platform integrates piezoelectric stack actuators and a novel sensor concept. During the machining process (e.g. milling), the contact between the cutting tool and the workpiece surface at the tool tip point generates chattering vibrations. Any vibration is recorded on the workpiece surface, directly affecting its roughness. Consequently, uncontrolled vibrations lead to poor surface finishing, unacceptable in high precision milling. The proposed Smart Platform aims to improve the surface finishing of the workpiece exploiting a broadband AVC strategy. The paper describes the steps throughout the design phase of the platform, beginning from the actuator/sensor criteria selection taking into account both performance and durability. The novel actuation principle and mechanism and the related FE analysis are also presented. Finally, an integrated mechatronic model able to predict in closed-loop the active damping and vibration-suppression capability of the integrated system is presented and simulation results are discussed.Item Eco-efficient and highly productive machine tools by means of an holistic eco-design approach(2010) Zulaika, Juan Jose; Dietmair, Anton; Verbeeten, Wilco; Campa, Francisco Javier; De Lacalle, Luis Norberto López; MAQUINASMachinery manufacturers are facing the challenge of designing machine tools that are productive, accurate and reliable and that at the same time consume the least possible amount of material and energy resources. In view of this, this paper presents a multidisciplinary methodology for designing milling machines that achieve a high level of productivity while at the same time ensuring high machining quality and less energy consumption during their use phase. Following this methodology, an eco-productive milling machine has been designed and manufactured which, combining different technologies (light materials, active vibration damping system etc.), has managed to reduce the inertias involved in servo-drives by over 50%, with a corresponding reduction in energy consumption, whereas the productivity of the machine - measured in terms of metal removal rate- has been increased by 100% in such a way that productivity and eco-efficiency have been combined in a single machine: the eco-productive milling machine.Item Research plan on the development of a holistic eco-design methodology for conceiving eco-efficient and highly productive machine tools(2010) Zulaika, Juan Jose; MAQUINASMachinery manufacturers are facing the challenge of increasing the productivity of their machines while assuring at the same time high levels of accuracy and reliability. This increase in the productivity is being achieved anyway at the expense of increasing also the consumption of material and energy resources. In view of this, this paper presents a methodology for designing machine tools that achieve high levels of productivity while reducing their material content for the production phase, reducing thus also the energy consumption during their use phase. Following this methodology, a complete milling machine has been designed and produced which, combining different technologies (light materials, active damping etc.), has reduced the inertias involved in servo-drives by over 50%, with a corresponding reduction in energy consumption, whereas the productivity of the machine has been increased by 100%, in such a way that productivity and eco-efficiency have been combined in a single machine: the eco-productive milling machine.