| Titre : |
3D-printed minimalists : Improved extrusion head designs thanks to additive manufacturing |
| Type de document : |
texte imprimé |
| Auteurs : |
Heinz Gross, Auteur ; Sebastian Gross, Auteur ; J. M. Nóbrega ; Joao P. O. Vidal |
| Année de publication : |
2019 |
| Article en page(s) : |
p. 40-43 |
| Langues : |
Anglais (eng) |
| Catégories : |
Fusion sélective par laser La fusion sélective par laser (selective laser melting en anglais) est une technique de fabrication additive capable de produire des pièces métalliques à l'aide de lasers de haute puissance, faisant fusionner progressivement et localement, c'est-à -dire de façon sélective, une poudre métallique dans une atmosphère contrôlée.
Impression tridimensionnelle
Malaxeurs et mélangeurs
Matières plastiques -- Extrusion
Simulation par ordinateur
Têtes d'extrusion
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
The development of additive manufacturing processes, such as selective laser melting (SLM), has significantly extended the options for manufacturing extrusion heads. Extrusion head designs can now be realized with very slender geometries, which not only have integrated mixer functions, thereby improving the melt homogeneity, but can also be used to attach the mandrel to the head. This allows compact heads to be manufactured with a very high potential for saving operating costs. |
| Note de contenu : |
- An innovative head design avoids weld marks and reduces the number of invidual parts
- Design challenges
- Head for a small-diameter tube
- Blow molding for a parison
- Head for thin tubes
- Figure : Size comparison: the mixer spider-type head mounted on the extruder, which is manufactured by an additive process, without the heating tapes, weighs 480 g ; the conventional head lying below it in the catch basin weighs 32 kg
- Fig. 1 : A spider-type head manufactured conventionally, with radial adjusting screws for centering the die
- Fig. 2 : Section through the innovative pipe head in perspective view
- Fig. 3 : Air channel that follows the profile of the wall of the honeycomb system
- Fig. 4 : Tube head with tilt die and axial setting screws during the testing at Siro-Plast GmbH
- Fig. 5 : Mixer-spider-type head with counterrotating
spiral mixer spider legs : 3D view and mounted on the trial extruder
- Fig. 6 : Simulation results of a color exchange trial after 5 s ; figures top left : with supporting air channel ; figures bottom left : channel section rotated through 90 degrees without the disruption of the melt stream by the supporting air channel. Blue : original color; red: color purged out of the channel with the blue melt
- Fig. 7 : Color exchange trials : the improved mixer spider-leg system results in uniform colors over the entire cross-section of the samples, which were removed at different times during color exchange trials
- Fig. 8 : Cutaway view of a one-piece mixer-spider-type head with an innovative Integrated supporting air-channel system and a sensitively adjustable tilt die |
| En ligne : |
https://drive.google.com/file/d/1CtB4_4kYnN_-sTEmwiaIHeKZ_aZVpB5s/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31825 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 1-2 (01-02/2019) . - p. 40-43
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