HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
Purpose -The purpose of this article is to determine if the level of recyclability of atomized Ti-6Al-4V powder, used as raw material in electron beam melting (EBM), is in compliance with aeronautical standards. Design/methodology/approach -The adopted strategy for this study was to manufacture a series of builds in the EBM system recycling the same powder from build to build. Optimized EBM process parameters were used, as well as the common procedure of powder recycling for each build, to emulate real production conditions. The aim of the study is to confirm that the powder properties are kept within the range of chemical contents which complies with the aeronautical standards despite numerous reuses. Findings -The conclusion of this study is that the EBM-processed Ti-6Al-4V powder properties are conserved in consecutive builds with recycled powder. This study shows that significant raw material can be saved by powder recycling since the powder quality is kept in range throughout consecutive builds, despite the working conditions of EBM. Practical implications -The main two advantages of application of EBM in the aerospace sector are design freedom and reduction of buy-to-fly ratio. The design freedom enables the creation of lightweight structures, which can significantly reduce the fuel consumption, while the reduction of buy-to-fly ratio enables much material saving in manufacturing of aircraft parts. Originality/value -The present study represents the first complete study on atomized Ti-6Al-4V powder processed in EBM which was made for the sake of aeronautical sector.The study presented in this paper has been conducted within the framework of the AEROBEAM project: Direct Manufacturing of stator vanes through electron beam melting. This project is funded by the European Union under a Joint Technological Initiative denominated Cleansky in which major European aerospace agents, together with Research Executive Agency, provide assessment and funding for projects of special relevance for the aerospace industry.
In order to save cost and time, the manufacturability of injected parts should be analysed and estimated in early design stages using some appropriate method of part representation. This paper presents the use of the mid-surface of a part to perform automatic assessment of the manufacturability of injected parts. This approach allows the manufacturability to be analysed in a short time, so that the analysis can be integrated into the stage of part modelling. The mid-surface is homotopically identical to the solid model of the part, and it can substitute the corresponding solid model in the evaluation of aspects of manufacturability such as safe demoulding. In other aspects, such as partial cycle times and abrupt changes in thickness, mid-surface offers more possibilities than a solid model because it contains an explicitly defined thickness distribution. Furthermore, mid-surface can be used for the purpose of guiding design correction. This paper outlines the foundations underlying the analysis of manufacturability aspects based on a mid-surface approach.
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. vpetrovic@aimme.es 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59
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