1,721,019 research outputs found
METODOLOGIE INNOVATIVE PER RIDURRE IL TEMPO DI MESSA A PUNTO DI NUOVI PRODOTTI E RELATIVI STAMPI NEL SETTORE CALZATURIERO
No full textMETALLURGICAL PHASES DISTRIBUTION DETECTION THROUGH IMAGE ANALISYS FOR SIMULATION OF LASER HARDENING OF CARBON STEELS
No full textThis paper deals with an original method for detecting the topological distribution of the ferrite and pearlite phases concerning a medium carbon hypo-eutectoid steel. Starting from a digital metallographic image a computation algorithm is applied to the pixel grid and a text array is generated reproducing the actual position of every phase into the bulk of the material. This result could be very useful to technological processes FEM simulators, where a good knowledge of the starting material is a required condition in order to obtain reliable and accurate results
ANALISI E MONITORAGGIO DEL PROCESSO DI PRODUZIONE DI MANUFATTI IN MATERIALI COMPOSITI MEDIANTE TECNOLOGIA VA-RTM.
No full text
The influenceof plasma plume in Laser milling for mould manufacturing
No full textThe paper refers to the modeling of the plasma plume influence on the shape of the crater ob-tained by means of nanosecond pulsed laser milling. A transient model of the physical state of the plasma plume is developed according to the laser parameters. Two empirical coefficients are pro-posed in the model in order to evaluate the plasma plume self-emission energy lost towards the en-vironment and the energy spread from the plasma towards the target surface.
These two coefficients, directly correlated to the depth and to the width of the crater, can be ex-perimentally determined, due to the difficulty of their analytical quantification, and they can be used for tuning a complete plasma plume software package for laser milling simulation named LAS (La-ser Ablation Simulator) already developed by the authors.
In this paper their influence on the crater shape will be proved by means of several simulation runs
Geometrical inspection of designed and acquired surfaces
No full textIn this study a series of procedures were implemented to compare acquired surfaces with the nominal data or to directly compare different scanned surfaces. In particular a morphological evaluation algorithm based on the extended Gaussian curvature (EGC) and a method to compare features based on aggregate normal orientation are presented. To perform the comparison between the features a simple procedure for segmentation was developed. The main characteristic of the two methods is a robust behavior referring to the scan orientation. The procedures were implemented as software modules in a graphic environment
LASER ABLATION MODELLING FOR CNC MACHINE TOOL APPLICATION IN MOULD MANUFACTURING
No full textIn this paper an original mathematical model of laser ablation is presented. Laser ablation optimization is quite a complex activity due to the high number of parameters involved and nowadays the most common way to set up the process, in industrial environments, is based on a “trial and error” activity. In order to reduce the set-up time, which can be very long when different materials and shapes have to be processed, a mathematical model is presented where the process parameters are related to the most important machining results such as ablated volume, temperature in work piece, resulting surface conditions. The plasma plume effects on the machining operations are considered. The comparisons between the theoretical and experimental results are finally presented
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