| Titre : |
Customized foam : Process variant of foam injection molding opens up new lightweight construction potential |
| Type de document : |
texte imprimé |
| Auteurs : |
Mike Tromm, Auteur ; Hans-Peter Heim, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 26-28 |
| Langues : |
Anglais (eng) |
| Catégories : |
Matériaux -- Allègement
Mousses plastiques -- Moulage par injection
Procédés de fabrication
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
With special mold technology and process control, it is possible to produce parts with locally highly foamed structures. The foam can considerably extend the limited design freedom of compact molded and conventionally foamed parts. Hence, extremely abrupt changes in wall thickness can be achieved and conventional design guidelines for ribs circumvented. Variothermal process control ensures excellent surfaces here. |
| Note de contenu : |
- Lightweight construction potential is not yet exhausted
- Precision opening restricted to specific mold areas
- Hydraulic cylinder changes cavity volume inside the closed mold
- Abrupt changes in wall thickness and surfaces as required
- FIGURES : 1. Comparison of processes : the conventional foam injection molding in contrast to the high-pressure foam injection molding in combination with precision mold-opening - 2. Principles behind the pull an foam process : after volumetric mold filling, a section of the cavity is enlarged. The pressure drop initiated this way allows the blowing agent to expand locally to a greater extent - 3. The special features of the new experimental mold are the locally variable cavity volume and a variothermal insert - 4. Schematic diagram, locally expanded part and cross-sectional cut through an expanded rib area : the widest rib, at 10 mm, has been expanded five-fold here - 5. Variothermal temperature cycle with brief heating by 100K (from 90°C to 190°C) and subsequent cooling to th estandard mold temperature with the corresponding thermographic images of the mold. The positive influence on the surface quality is clear to see - 6. Cell size as a function of the process parameters : the results of the test plan show that, within the process window selected, the cell size and density can be influenced by a factor of 10 |
| En ligne : |
https://drive.google.com/file/d/1hnY4cFcH4KKxS58jy0iUc-KiDr1ZOIb1/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30086 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 26-28
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Customized foam in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 1-2 (01-02/2018)
