1,721,041 research outputs found
L'organizzazione della produzione, i valori del passato per un futuro sostenibile
No full textL'articolo esamina l'evoluzione storica dell'organizzazione della produzione industriale ed esamina le motivazioni alla base delle scelte organizzative per la gestione della produzione industrial
An experimental evaluation of an etching simulation model for photochemical machining
No full textPhotochemical machining can satisfy the large demand coming from the microproducts market. The metal etching technologies lack however a precise control over the micro-geometry of surfaces. Metal etching results from diffusive and kinetic phenomena whose relative importance depends on process parameters. The effects of the chemical kinetics on the etching regime and, consequently, on the surface generated by wet-chemical etching need a thorough investigation. This paper reports an experimental assessment of a 2D simulation model of etching, where also the role of reaction products dynamics is considered. Furthermore an experimental analysis of the process parameters on micro-geometry is reported. © 2010 CIRP
Application of artificial neural networks to conoscopic measurement, Invited Keynote paper
No full textMeasurement and topography characterization of surfaces produced by Selective Laser Sintering
No full textSelective Laser Sintering (SLS) permits to manufacture physical models, suitable to be used as sand moulds in the casting processes. SLS presents some technological limits as regards the dimensional precision and surface roughness, which require an accurate assessment. Unfortunately contact methods are not able to carry out these measurements. This paper investigates the possibility of using a new non-contact instrument based on conoscopic holography to measure both microgeometry and macrogeometry of SLS samples. The reliability of measures and its influence on roughness parameters is discussed. A procedure for characterizing and identifying the sample edges is introduced
Angiografo a Campo Rotante Rapido
No full textThe invention relates to radiological equipment which can be used to obtain an image of the object in a view which varies continuously with time. This machine has a structure similar to that of a conventional angiograph, but differs from it in the possibility of rapidly rotating the radiogenic-intensifier tube around the patient during exposure in a time interval compatible with the duration of the intravascular injection of contrast medium. The image so obtained provides three dimensional information about the object examined
Effect of flushing and electrode material on die sinking EDM
No full textThe most important parameters of EDM are the removal rate, the electrode wear, accuracy and surface texture. In this paper the influence of electrode material, flushing, electrode dimension, depth of cut and planetary motion on EDM performance is discussed. An experimental analysis was carried out on a Cr, Mo, V steel for die casting by using both copper and graphite electrodes. Roughing and finishing operations were considered, by adopting for each condition the parameters commonly recommended in industrial production. The observed results show the importance of electrode material, injection flushing and geometry of cutting on removal rate, electrode wear and surface quality
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