Browsing by Author "Tosi, Riccardo"

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    On Optimization of Surface Roughness of Selective Laser Melted Stainless Steel Parts: A Statistical Study
    (Springer, 2014-04-22) Airbaey, K.; Wimpenny, David Ian; Tosi, Riccardo; Manning, Warren; Moroz, Adam
    In this work, the effects of re-melting parameters for postprocessing the surface texture of Additively Manufactured parts using a statistical approach are investigated. This paper focuses on improving the final surface texture of stainless steel (316L) parts, built using a Renishaw SLM 125 machine. This machine employs a fiber laser to fuse fine powder on a layer-by-layer basis to generate three-dimensional parts. The samples were produced using varying angles of inclination in order to generate range of surface roughness between 8 and 20 lm. Laser re-melting (LR) as post-processing was performed in order to investigate surface roughness through optimization of parameters. The re-melting process was carried out using a custom-made hybrid laser re-cladding machine, which uses a 200 W fiber laser. Optimized processing parameters were based on statistical analysis within a Design of Experiment framework, from which a model was then constructed. The results indicate that the best obtainable final surface roughness is about 1.4 lmĀ±10%. This figure was obtained when laser power of about 180 W was used, to give energy density between 2200 and 2700 J/cm2 for the re-melting process. Overall, the obtained results indicate LR as a postbuild process has the capacity to improve surface finishing of SLM components up to 80%, compared with the initial manufactured surface.
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    Remanufacture of turbine blades by laser cladding, machining and in-process scanning in a single machine
    (University of Texas, 2012-08) Jones, Jason B.; McNutt, Phil; Tosi, Riccardo; Perry, Clinton; Wimpenny, David Ian
    Remanufacturing is one of the most efficient ways of recycling worn parts because it consumes only a fraction of the energy, cost, and material required for new parts. Remanufacture of engineering components typically entails serial labor intensive and operator skill sensitive processes, often requiring parts to move between manufacturers and subcontractors. Unfortunately the logistics and quality assurance measures required for effective remanufacturing currently restrict its implementation primarily to high value components (e.g. turbine blades, blisks, etc.). This research reports progress toward an integrated production system which combines laser cladding, machining and in-process scanning in a single machine for flexible and lean remanufacturing.