| Titre : |
The switchover problem and its consequences : Phaseless process control should revolutionize the switchover process |
| Type de document : |
texte imprimé |
| Auteurs : |
Christian Hopmann, Auteur ; Katharina Hornberg, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 40-43 |
| Langues : |
Anglais (eng) |
| Catégories : |
Matières plastiques -- Moulage par injection
Moulage par injection -- Défauts
Procédés de fabrication
Qualité -- Contrôle
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
The switchover process from the injection phase to the holding pressure phase is frequently the cause of ‧reduced part quality in injection molding. An alternative process control concept aims to remedy this by completely eliminating the switchover process. For this purpose, the cavity pressure curve is predetermined and controlled for the entire filling process. |
| Note de contenu : |
- Which switchover method is best ?
- Part quality is process-dependent
- How the switchover affects the quality
- The solution to avoid the break between the controlled variables
- Figure : Typical injection molding defects, caused by incorrect switchover from injection toholding pressure phase
- Fig. 1 : The parts were manufactured on an injection molding machine (type: Allrounder 370A, manufacturer : Arburg GmbH + Co KG, Lossburg) using a polypropylene (grade : PP579 S)
- Fig. 2 : The regression analysis describes the change in length of the part when the machine setting variable is varied by one unit
- Fig. 3 : A pressure peak can be identified in the cavity pressure curve for the screw position-dependent switchover method
- Fig. 4 : The control loop consists of a superordinate quality control, which generates the target trajectories for a subordinate process control
- Fig. 5 : The cavity pressure curve steadily converges to the reference trajectory of 250 bar |
| En ligne : |
https://www.kunststoffe.de/en/journal/archive/article/phaseless-process-control- [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33982 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 2 (02/2020) . - p. 40-43
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The switchover problem and its consequences in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 2 (02/2020)
