| Titre : |
Using breathing signals for process optimization : Comparative methods for determining mold breathing |
| Type de document : |
texte imprimé |
| Auteurs : |
Georg Pillwein, Auteur ; Johannes Lettner, Auteur ; Markus Lehr, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 26-31 |
| Langues : |
Anglais (eng) |
| Catégories : |
Capteurs (technologie)
Matières plastiques -- Moulage par injection
Moules d'injection
Pression
Serrage (mécanique)
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
Mold breathing provides useful information about the processes that occur in the mold and the cavity. Mold-maker Schneider Form and injection molding machine-maker Engel have recognized the potential which this process variable offers and have worked intensively on it for several years, albeit by adopting different approaches. They recently carried out joint tests on bumper molds using a two-platen injection molding machine with a clamping force of 40 000 kN and then swapped experiences. |
| Note de contenu : |
- Used for large parts, such as bumpers
- Signals on the test bench
- Avoiding additional costs of tens of thousands of Euros per year
- Optimized breathing curves reduce the required clamping force
- More efficient blueing
- Clamping force optimization made easy
- Fig. 1 : Mold breathing in brief (exaggerated drawings) : when the mold closes without force, there is no compression of any significance initially. As the clamping force builds up, the mold height and the volume of the cavity are reduced. Some of this compression is compensated by the opening pressure of the melt during injection. The resulting change in cavity volume and mold height is known as mold breathing
- Fig. 2 : For the opti-check measurements - shown here on mold 2 - sensors were placed at various points in the cavity. The red circles mark the injection points
- Fig. 3 : The tests were carried out in the Schneider form pilot plant on an Engel duo23050/4000 injection molding machine
- Fig. 4 : Comparison of the molds breathing signals from OptiCheck and iQ clamp control during an injection cycle in mold 1 (ABS). The hydraulic injection pressure is provided for reference. The opening of shut-off needles is indicated by dashed lines, and the switchover point, by a solid line
- Fig. 5 : Influence of the shut-off needle setting on the profiles of hydraulic injection pressure and various breathing signals of mold 2 (PP). The orange curve shows an unfavorable setting, while the green curve shows the variant optimized for low opening pressure. The magnifications on the right show the time range before the switchover poin
- Fig. 6 : Comparison of the profile of various breathing signals on mold 1 (ABS) with all pressure platens and with some pressure platens removed in the area of the flanks |
| En ligne : |
https://drive.google.com/file/d/10tppGqqVW1Orss1YGnJlD5eFjj6KO4s6/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33834 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 1 (01/2020) . - p. 26-31
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