Achieving a more secure connection with the correct design / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 32-35 Titre : Achieving a more secure connection with the correct design : Higher process quality through adjustment of the production parameters Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Maximilian kramer, Auteur ; Elmar Moritzer, Auteur ; Christian Held, Auteur Année de publication : 2022 Article en page(s) : p. 32-35 Langues : Anglais (eng) Catégories : Assemblages (technologie) Matières plastiques -- Moulage par injection Thermodurcissables Vissage Index. décimale : 668.4 Plastiques, vinyles Résumé : In a research project being carried out by the IKV and KTP, the influence of geometric and process parameters on the quality of the screw connection in the direct assembly of thermosetting plastics has been analyzed. The research results show that, in addition to the geometric design, the production parameters offer additional optimization potential for the reliability of the screw connection. The compactness and curing degree of the parts exert the largest influence. Note de contenu : - Measuring the torque guarantees a reliable screw joint - Geometry influences flank coverage and quality of the screw connection - Injection molding parameters further optimize the quality of the screw joint - Fig. 1 : In order to better understand the influences exerted on direct screwing processes in thermoset molding compounds, the screw connection is designed and optimized in an iterative process - Fig. 2 : Sketch of the screw-in tube with the varied geometry parameters. A modular mold structure allows an analysis of the different tube geometries - Fig. 3 : Influence of the geometry parameters : a high differential torque provides for adequate space before failure of the screw connection and thus ensures a higher quality of the joint - Fig. 4 : Evaluation of the significance analysis: the largest influence on the quality of the screw connection comes from the holding phase and the subsequent curing time - Table 1 : Factors and steps for the injection molding tests En ligne : https://drive.google.com/file/d/1zuOz1HxK6i--bhJRf-CLfehTbIWoMLmD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37964 [article]

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Excellent resistance at reduced weight / Christian Hopmann in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 11 (11/2019)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 11 (11/2019) . - p. 28-31 Titre : Excellent resistance at reduced weight : The qualification of suitable foam injection molding processes enables the use of thermosets in lightweight construction applications Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; Maximilian kramer, Auteur ; Stefan Haase, Auteur Année de publication : 2019 Article en page(s) : p. 28-31 Langues : Anglais (eng) Catégories : Agents d'expansion (chimie) Matériaux -- Allègement Matières plastiques -- Moulage par injection Matières plastiques -- Propriétés mécaniques Sphères creuses Index. décimale : 668.4 Plastiques, vinyles Résumé : The transfer of foam injection molding from thermoplastic to thermoset processing has not yet been implemented in industrial practice. IKV Aachen has investigated this transfer and has precisely analyzed the economic efficiency of the process and the potential for lightweight construction. Note de contenu : - Which foaming processes are suitable ? - Hollow glass spheres as an alternative - Studies with chemical blowing agents - Pros and cons of hollow glass spheres - Cost comparison facilitates process selection - Figure : Foamed thermosets can be used to produce low-density thermally resistant components at low cost - Fig. 1 : The expansion of the chemical blowing agent in thermoset foam injection molding is similar to thermoplastic foam injection molding in the mold, but the reaction is thermally initiated - Fig. 2 : The specimen geometry allows the analysis of different material properties - Fig. 3 : Influence of the process parameters : with an increasing blowing agent content the component weight is reduced. The results of the mechanical analysis are shown on the right - Fig. 4 : In addition to an increasing content of hollow glass spheres (HGS,) decreasing melt temperatures and injection speeds leat to lower component weights. The stiffness and impact strength can even be improved - Fig. 5 : The cost comparison calculation shows that the use of chemical blowing agent results in an economic advantage for large quantities. Hollow glass spheres, on the other hand, improve the mechanical properties En ligne : https://drive.google.com/file/d/1i85hS5I34K35GwyaKLUowwPd8M4Mf9o0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33654 [article]

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