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• W2275101207 abstract "Forming operations are among the most frequently used processes in sheet metal working. Dynamic phenomena occurring represent critical aspects for geometrical accuracy of products and service life of machines parts in high-tech forming machine sector. Stiff presses allow high repeatability and dimensional accuracies but, at the same time, determine rapid and excessive deterioration of tools by stresses and wear. On the other hand, softer ones improve the efficiency and the service life of tools, but with higher energy dissipation and bigger scatter in product dimensions that make processes unreliable with respect to precision.The right trade-off is often the main prerequisite for the technical and economic success of the whole process and must therefore be found, especially with complex non-symmetric geometry and if vibrations take place during the process.Since the interaction of different elements determines the dynamic efficiency of forming machines, controls systems for the compensation of elastic deformations result fundamental for the component accuracy and the required tolerances. Conventional actuators devices present strong limitations in both performances and reliability, with restricted possibilities of closed-loop controls. The best solution is represented by new technologies, able to enhance the control of phenomena process.Magneto-rheological (MR) fluids represent one of the most versatile and promising solutions for the development of high efficiency damping systems, capable to grant high versatility of configuration and effective closed-loop control capabilities. The main objective of this work is to study magneto-rheological fluids technology, used up-to-now especially in anti-seismic and automotive fields, in order to extend to the industrial material forming processes. Due to the complexity of the physics fields involved, the majority of models are based on analytical descriptions that, though easy and fast to implement, present strong limitations for the accurate design of the functional devices. A new approach is introduced, focused on a multi-physics coupled numerical model of the vibration dampers, based on calibrations by physical-simulation.Different damper prototypes are realized for the laboratory tests, in order to experimentally analyse fluid and device behaviours.On these bases, the application of these innovative damping systems and the evaluation of their performances are extended in the industrial context. The experimental tests, conducted on an hydraulic press using both commercially available hydraulic dampers and MR dampers, are analysed with particular focus on the excited frequencies, the vibrations and the powers to quantify the impact of dynamic phenomena on the quality of final parts. The developed prototypes are able to elevated damping performances without complex adjustment calibration when setting up a new process, making flexible its design." @default.
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• W2275101207 date "2011-01-31" @default.
• W2275101207 modified "2023-09-27" @default.
• W2275101207 title "Active vibration control systems based on magneto-rheological fluids for sheet metal forming processes" @default.
• W2275101207 hasPublicationYear "2011" @default.
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