Abstract
Additi ve manufa cturing (AM) of me tal powde r by ele ctron bea m fusion offe rs sig nifi cant adva ntages compa re d with tradi tional subtra cti ve manufa cturing te chniques . AM has de veloped signi fi cantl y ove r re cent years and is now widel y used in acade mi c a nd industry, pa rti cula rl y in ae rospa ce and medi cal de vi ce manufa cture. AM te chniques s till ha ve many unsol ved challenges, such as the de te ction of pa rt defe cts de velope d duri ng the AM building process. Powde r deli ve ry is a process tha t occurs many thousands of times during the build cycle, consequentl y the assessment of deli ve ry quality would be important for in-build quality control . This pape r des cribes the de velopment of an inspe ction s ys tem for the powde r bed deli ve ry by using phase measure ment profilome try. A compensa tion algori thm for nonlinear e ffe ct is inves tiga ted in orde r to i mpro ve the accura cy and tra ceability of the inspe cti on te chnique. A te mporal s ynchronisation te chnique is employe d to re duce the da ta capture ti me down to 2 se conds for ea ch inspe ction. Addi tionall y a novel calibra tion me thod based on a surfa ce fitting algori thm is inves tiga ted and employed to reduce the influence of phase e rror and random noise. The resul ts show the deploye d calibra tion protocol can effe cti vel y enhance the inspe ction a ccura cy and sol ve hi ghe r ha rmoni c proble ms. The proposed in -situ inspe ction te chnique was deploye d on a prototype ele ctron beam melting (EBM) AM machine. An e xample of e xcessi ve powde r deli ve ry due to rake damage during a real pa rt build i s used to de mons tra te the s ys te m capability on the a ctual EBea m ma chine. Addi tionall y, two e xa mples of e xcessive powde r deli ve ry a cross a reas of the powde r bed and the resul ting scanning results obtained duri ng the building are shown. Expe rime ntal resul ts de monstra te tha t powde r defe cts can be e ffi cientl y inspe cted wi th the proposed te chnique and inspe ction a ccura cy is improved s i gnificantly by a pplying the proposed calibration me thod and compensation algorithm.
Original language | English |
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Title of host publication | European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019 |
Editors | Richard K. Leach, D. Billington, C. Nisbet, D. Phillips |
Publisher | euspen |
Pages | 324-327 |
Number of pages | 4 |
ISBN (Electronic) | 9780995775145 |
Publication status | Published - 2019 |
Event | 19th International Conference of the European Society for Precision Engineering and Nanotechnology - Euskalduna, Bilbao, Spain Duration: 3 Jun 2019 → 7 Jun 2019 Conference number: 19 https://www.euspen.eu/events/19th-ice-bilbao/ |
Conference
Conference | 19th International Conference of the European Society for Precision Engineering and Nanotechnology |
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Abbreviated title | EUSPEN 2019 |
Country/Territory | Spain |
City | Bilbao |
Period | 3/06/19 → 7/06/19 |
Internet address |