A model- and simulation-based approach for tolerancing and verifying the functional capability of micro/nano-structured workpieces |
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| Affiliation: | 1. Department of Materials Engineering, Applied Mechanics and Construction, School of Industrial Engineering, University of Vigo, C.P. 36208 Vigo, Spain;2. Department of Natural Resources and Environmental Engineering, School of Mining Engineering, University of Vigo, C.P. 36310 Vigo, Spain;1. Washington State University, Material Science and Engineering Program, Pullman, WA 99163, USA;2. Sandia National Laboratory, Albuquerque, NM 87123, USA;3. Sandia National Laboratory, Livermore, CA 94588, USA;4. Purdue University, Materials Engineering, West Lafayette, IN 47907, USA;1. Associazione EURATOM-ENEA sulla Fusione, Via Enrico Fermi 45, 00044 Frascati, Rome, Italy;2. Fusion For Energy c/Josep Pla, 2 Torres Diagonal Litoral, 08019 Barcelona, Spain;1. Department of Innovation Engineering, University of Salento, Lecce, Italy;2. Cavalera s.r.l., Galatone, Lecce, Italy |
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| Abstract: | The evaluation of functional features of manufactured workpieces is based on GO- and NO-GO-test results, which are obtained by comparing measured geometric characteristics with nominal dimensions and tolerances specified by the designer. These geometrical specifications are based on a tolerancing system, which was originally defined for the function mating capability. Against the background of upcoming lots of other new functions (like reduction of flow resistance, light absorption, reduction of friction, diffraction of light, self-cleaning or mass transmission) are to be realized with our products – particularly by micro- and nano scaled features. If the verification process will deliver the prediction of the achievable degree of functionality, the usability of a part can be assessed more accurately and in consequence quality and economics can be improved. So, a new principle for tolerancing and verifying turns out to be necessary. In this paper the fundamental deficit of the actual tolerancing and specification systems GPS and ASME Y14.5 is derived and the path for enlarging the system by preposing a functional model is shown. To verify the functional capability of the workpieces an approach based on simulations done with the parameterized mathematical–physical model of the function is suggested. Advantages of this approach will be discussed and demonstrated by examples with microstructured inking rolls, crankshafts and injection valves. |
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| Keywords: | Function-oriented Metrology Virtual functional gauge Model of function Micro engineering Tolerancing |
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