Meyer, Daniel
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Meyer, Daniel
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Meyer, Daniel
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Meyer, D.
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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 94 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Analysis of internal material loads and Process Signature Components in deep rollingThe high mechanical loads in deep rolling lead to a beneficial surface topography, hardness alterations, and compressive residual stresses. The generation of defined residual stress values has been achieved in a mainly iterative way, as the relevant internal material loads occurring during the process could not be considered. They are difficult to determine experimentally and well-validated models are required to deduce them e.g. from finite element (FE) simulations. In this study, a 3D FE model has been developed to analyze the strains in the workpiece material as a measure for the internal material load during the process. The residual stress profiles were measured by x-ray-diffraction and are presented in a way that allows for deriving the internal material loads required to induce a desired residual stress state.Wissenschaftlicher ArtikelBand:35255 155 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Internal reinforced domains by intermediate deep rolling in additive manufacturingThis paper presents a new concept to integrate mechanical surface treatment into the build process of additive manufacturing (AM). The layer-based build process during Selective Laser Melting (SLM) allows for accessing the single layers before continuing the addition of further layers above the mechanically treated surfaces. Deep rolling is applied to enhance the Surface Integrity into depths of several SLM-layers (450 μm) before the part is re-integrated into the SLM-process. The hardness alterations and increased full-width-half-maximum (FWHM) are preserved after continuing the AM-process. The results reveal the potential to generate material-internal reinforced domains and thus enhance the Material Integrity after AM.Wissenschaftlicher Artikel144 205 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Interactions of grinding tool and supplied fluidThis paper reviews the physical and chemical interactions between the rotating tool and the supplied fluid in grinding. The mechanisms of this tool-fluid interaction are the key for high performance grinding processes due to an efficient fluid supply resulting in a minimal thermomechanical impact on workpiece and tool. Reduced wear, increased surface finish, suitable subsurface properties of the machined material, increased material removal rates, and also energy efficiency can be achieved. In this context, the fluid supply towards the contact zone between tool and workpiece, the tool cleaning with high pressure cleaning nozzles as well as (tribo)-chemical phenomena between the abrasive layer and the supplied fluid are analysed and discussed. Finally, knowledge gaps are revealed which are indicating future research needs.Wissenschaftlicher ArtikelBand:69Heft:226 21 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Particle-oriented peening as method to investigate the material dependent deformation behaviourThe material and its microstructure define the behaviour of a part in a deformation process. A single particle deformation process is introduced as a rapid material characterization method extending already existing approaches. Particle-oriented peening is performed with spherical micro samples of the low carbon steel 100Cr6 (AISI 52100) and the martensitic stainless steel X46Cr13 (AISI 420). Three different diameters (0.6 mm, 0.8 mm and 1.0 mm) were chosen to investigate the impact of the material and the surface to volume ratio. By processing single particles, the mechanical and geometrical properties of the particle before and after the impact can be linked to the deformation behaviour during the peening process. The elastic and plastic material properties are revealed by studying the remaining plastic deformation of the particle and the velocity reduction as a result of the impact. Instrumented universal micro hardness measurements are carried out to determine the hardness of the particles and to correlate it with the behavior of the particles during the particle-oriented peening process. The plastic deformation work as a characteristic value of micro hardness measurements of the different material states is discussed. It is conceivable that the consideration of different material behaviour related values (so-called descriptors) may replace conventional material testing in the future. Using short-term characterization methods like the particle-oriented peening a fast determination of material properties is possible.Wissenschaftlicher Artikel55 57