Browsing by Author "Zulaika, Juan Jose"
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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 Polynomial path profiles for Machine Tools with low frequency excitation(Institute of Electrical and Electronics Engineers Inc., 2007) Larranaga, Josu; Zulaika, Juan Jose; Agirre, Jon; ROBOTICA_AUTOMA; MAQUINAS; GENERALThe aim of this job is to study the polynomial path profiles with low frequency excitation. In one dimension, time dependent, kinematical path profiles frequency spectrums are studied. We show that any discontinuity on the k-th order position derivative of the path profile lead to the excitations on the whole frequency spectrum. The decay on frequency is faster as the order of the discontinuity raises. Therefore, Machine Tools will have less frequency excitation if higher order path profiles are used. Fourth order path profiles are generated combined with low pass filters. The path profile design procedure is the following: to find an optimal function effected by the jerk derivative, with the cost functional of frequency weighted energy. The profile optimization is more effective if a Particle Swarm optimization is used. For simulation, frequency spectrums of both path profiles are represented.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.