By virtue of high-quality standards, work-holding devices have an important role in industrial machining processes. Especially thin-walled and fragile parts in micro manufacturing, but also free formed and irregular shaped workpieces in macro manufacturing are diﬃcult to be clamped. In order to face these challenges, an innovative phase changing and adhesive clamping technique is introduced and investigated: clamping with ice. Clamping by means of adhesive and cohesive forces of frozen water introduces a sustainable and ﬂexible clamping technology for a nearly deformation-free clamping of hard-to-clamp workpieces. A prototype of an embedded control system and an optimized clamping device is designed and manufactured, based on the gained results from preliminary investigations. The proposed thermoelectric coolers are realized using controlled Peltier cells. After a physical validation of a mathematical model of the considered Peltier structures, a distributed control optimization is proposed. The control strategy is combined with a sensorless state estimation using Extended Kalman Filter, and comparatively proved to improve the ice clamping performance towards a more accurate and homogeneous cooling and thus, a more secure and, for industrial applications, more suitable clamping. Different strategies using PID controllers, Sliding Mode Control are investigated. Real measured results are discussed
Brief Biography of the Speaker:
Paolo Mercorelli received a Ph.D. degree in Systems Engineering from his Alma Mater, Studiorum University of Bologna, Bologna, Italy, in 1998. In 1997, he was a visiting researcher for one year in the Department of Mechanical and Environmental Engineering, University of California, Santa Barbara, USA. He received an award from the Marie Curie Actions research fellowship program sponsored by The European Commission in year 1998. Thanks to this scholarship, from 1998 to 2001, Paolo Mercorelli was a postdoctoral researcher with ABB (Asea Brown Boveri) Corporate Research, Heidelberg, Germany. During the Heidelberg period he introduced, for the first time in ABB, software structures based on wavelet packets for fault detection and data reconciliation and he developed industrial trading software using these wavelet packets. He was the inventor cited in three patents in which the applicant was ABB Zuerich. Moreover, these wavelet packet structures were implemented and integrated in the Inferential Modelling Platform of the Advanced Control and Simulation Solution Responsible Unit within the ABB industry division. From 2002 to 2005, he was a senior researcher with the Institute of Automation and Informatics, Wernigerode, Germany, where he was the leader of the control group. From 2005 to 2011, Paolo Mercorelli was an Associate Professor of Process Informatics with Ostfalia University of Applied Sciences, Wolfsburg, Germany. In Wolfsburg, he was involved in various projects with the Volkswagen AG Research Center developing different control systems which have been implemented in production series of vehicles as, for instance, the control algorithms for Intelligent Parking Assist System. Since 2012 he has had the position of Full Professor and Head of the Chair of Control and Drive Systems at the Institute of Product and Process Innovation, Leuphana University of Lueneburg, Lueneburg, Germany. Since 2018 he has obtained an international visiting professor fellowship at the Institute of Automatic Control of Lodz University of Technology (Poland) and responsible for two courses at the Master’s in “Automatic Control and Robotics“. In Fall 2019 he was visiting Professor at the University of Miskolc (Hungary) giving lectures at the Master’s and PhD programs. His actual interests include Applications with Kalman Filters, Robotics, Wavelets, Geometric Control, Sliding Mode Control and Application with Sliding Mode Control.