| Titre : |
Declaring war on quench marks : The correct plug geometry makes the wall thickness more homogenous |
| Type de document : |
texte imprimé |
| Auteurs : |
Christian Hopmann, Auteur ; Dennis Balcerowiak, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 37-41 |
| Langues : |
Anglais (eng) |
| Catégories : |
Bouchons en matières plastiques
Conception technique
Matériaux -- Allègement
Matériaux -- Epaisseur
Matières plastiques -- Thermoformage
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
In addition to the choice of forming process parameters, the design of the pre-stretching plug in particular affects the wall thickness distribution. By directing plastic material into areas where thin spots develop during forming when using only compressed air, the material consumption and therefore weight can be reduced while maintaining a consistent component quality, simultaneously reducing the risk of quench mark formation during production. |
| Note de contenu : |
- Plug-assisted thermoforming
- Development and design of pre-stretching plug geometries
- Studies of the stretching distance and timing of compressed air activation
- Influence of the plug geometry
- Fig. 1 : Tool Geometry, plug dimensions, and measuring path to evaluate the produced cups. The invervals between the measuring points are 5 mm
- Fig. 2 : Wall thickness distribution of a cup produced without plug stretching and calculated, theoretical, homogenous wall thickness of a cup with the same mass (red line). For improved clarity, the respective values across from each other in the component have been averaged and shown on one cup half in the following diagrams
- Fig. 3 : Plug geometries : these shapes were developed to analyze the influence on the wall thickness distribution
- Fig. 4 : Preliminary investigation : the influence of the compressed air activation timing is low, the plug stretching distance on the other hand has a greater influence on the wall thickness distribution
- Fig. 5 : The plug edge radius with a constant wall incline mainly exhibits influences on the floor of the component
- Fig. 6 : Variation of the plug wall angles with a constant plug edge radius shows a considerable influence on the wall thickness distribution
- Fig. 7 : Using a cone-shaped, pointed plug produces a heterogeneous wall thickness distribution |
| En ligne : |
https://drive.google.com/file/d/1m0zPYnoyQaXxfy-wLzHlFUY0fkyjaK2g/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31538 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 11 (11/2018) . - p. 37-41
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Declaring war on quench marks in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 11 (11/2018)
