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Metals 2016,6, 313
3.2. Influenceof theDistancebetween theNozzle and theTopSurfaceof thePreviousLayer
In this section, only the layer thickness is discussed in order to maintain other parameter
consistency.Onegoalof thisexperimentwas toachievemultilayerdeposition.Afterone layerwas
deposited, theplatformwasmoveddownwardforadistance in thez-direction,andanother layerwas
depositedover thepreviousone. The formingprocessof theMLSPismorecomplicated thantheSLSP
due to thecomplexmorphologiesof thepre-deposited layer. In this section, the formingprocess is
basedontheoptimizedprocesswindowsof theSLSP.Eachthin-walledspecimenhas twelve layers
thatare100mminlength. If the formingdefectoccurs in thecurrent layer, the formingprocessmust
be terminated.
TheprocessparametersofCategoryBinFigure2wereused. In theexperiment, thedeposition
velocitywas18mm/s, theflowratewas50mm3/s,andthe layer thicknesswasset to0.9mm,1.2mm,
1.5mm, 1.8mm, and 2.1mm, respectively, the platformwasmoveddownward for a distance in
thez-direction. Figure4mainlyshowstheexperimental results. AsshowninFigure4a, thenozzle
contactedcompletelywith theworkpiecewhenthethicknesswas0.9mm,resulting inwider layers,
whichwas beneficial for the formation of a new layer, as good bonding quality can be achieved
between layers. AsshowninFigure4b,when the thicknesswas1.2mm, the thin-wallwasnot too
widewithheatcapillaryflowpressureandheatcapillaryflow,resulting in themostcomplex forming
state.AsshowninFigure4c, themoltenmetalgeneratedadraganglewhenthe thicknesswas1.5mm,
whichwillbediscussed indetail in thenextsection.AsshowninFigure4d,whenthe thicknesswas
1.8mm,therandomjetfromthemoltenmetalaffectedtheformingmorphology,whichledtothefailure
of thesubsequentdepositionprocess.AsshowninFigure4e, thenozzleseparatedcompletely from
theworkpiecewhenthe thicknesswas2.1mm. Inaddition, thehigh-speedmelthadastrongimpact
onthe freesurfaceof themelt.
149
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Buch 3D Printing of Metals"
3D Printing of Metals
- Titel
- 3D Printing of Metals
- Autor
- Manoj Gupta
- Herausgeber
- MDPI
- Ort
- Basel
- Datum
- 2017
- Sprache
- englisch
- Lizenz
- CC BY-NC-ND 4.0
- ISBN
- 978-3-03842-592-2
- Abmessungen
- 17.0 x 24.4 cm
- Seiten
- 170
- Schlagwörter
- 3D printing, additive manufacturing, electron beam melting, selective laser melting, laser metal deposition, aluminum, titanium, magnesium, composites
- Kategorien
- Naturwissenschaften Chemie