Espenhahn, Björn
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Item-typ:Veröffentlichung, Relevance of the region of interaction between the tool and the metalworking fluid for the cooling effect in grinding(Elsevier Science, 2022-07-12); ; ; ; The relevance of the metalworking fluid supply characteristics is well-described for grinding processes. In the presented work, the fluid's interaction with the grinding wheel between the point of impact and the contact zone has been analyzed. For varied supply conditions, deceleration and acceleration effects are obtained and quantified. Furthermore, shadowing effects related to the fluid entrainment towards the contact zone are considered. The observed effects within the region of interaction are consistent with the thermal limits of taper grinding experiments. By revealing the fluid's behavior within the region of interaction, explanation for the effectiveness of supply conditions is given.Wissenschaftlicher ArtikelBand:71Heft:1118 93 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Indirect geometry measurement method based on confocal microscopy and fluorescent microparticles(Society of Photo‑Optical Instrumentation Engineers (SPIE), 2023-08-15); ; ; The precise production of micro- or micro-structured components of increasingly different materials requires ever more precise and flexibly adjustable geometry measurement methods. Today’s optical metrology offers various innovative approaches for this purpose. A major shortcoming is, however, that not all surfaces and structures to be measured are optically cooperative and return too little light or information to the measurement system for the signal analysis. Therefore, indirect optical geometry measurements are introduced as a new approach: Instead of directly detecting the outer boundary layer of the measuring object, the shape of the object’s imprint in the surrounding medium is examined. For this purpose, the surrounding medium is enriched with fluorescent substances and a confocal microscope scans the space surrounding the measured object. The spanned area above which the fluorescence signal disappears is then determined as the boundary layer between the measurement object and the surrounding medium. As a result, the object geometry is obtained completely independently of the optical response behavior of the object. While first realizations studied measurements in a liquid environment, this work demonstrates for the first time the feasibility of indirect optical geometry measurements in air environments with the aid of fluorescent microparticles. In order to maximize the measurement accuracy, different model-based signal evaluation approaches for determining the interface geometry from the fluorescence signals are investigated and compared, taking both cases (liquid and air environment) into account. Finally, indirect optical measurements are performed on a step geometry, reconstructing the height profiles using the theoretically derived model function.Wissenschaftlicher Artikel83 87