Prediction and validation of the specific volume for inline warpage control in injection molding

The material-inherent specific volume behavior of polymers is highly important for producing dimensionally accurate injection molded parts since the shrinkage and the shrinkage-induced warpage are attributable to the specific volume behavior. Thereby, the prevalent process parameters melt temperatur...

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Autores principales:	Christian Hopmann, Chenglong Xiao, Cemi E. Kahve, Jan Fellerhoff
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Injection molding Simulation Modelling Inline data acquisition Specific volume Polymers and polymer manufacture TP1080-1185
Acceso en línea:	https://doaj.org/article/8873c903cd4c4542a362e591fd1ce548
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spelling	oai:doaj.org-article:8873c903cd4c4542a362e591fd1ce5482021-11-14T04:28:00ZPrediction and validation of the specific volume for inline warpage control in injection molding0142-941810.1016/j.polymertesting.2021.107393https://doaj.org/article/8873c903cd4c4542a362e591fd1ce5482021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S014294182100338Xhttps://doaj.org/toc/0142-9418The material-inherent specific volume behavior of polymers is highly important for producing dimensionally accurate injection molded parts since the shrinkage and the shrinkage-induced warpage are attributable to the specific volume behavior. Thereby, the prevalent process parameters melt temperature and cavity pressure significantly influence the prevailing specific volume. Many empirical models describe this pressure-specific volume-temperature (pvT) behavior.To minimize part warpage, a segmented dynamic mold temperature control has been developed which aims to homogenize the specific volume of a platen-shaped geometry. The mold temperature control is thereby controlled by a model predictive control concept, which predicts the local specific volume using an empirical pvT-model. A modified Tait-pvT-model is used for the prediction, which considers the effect of the cooling rate on the specific volume. To achieve homogenization of the local specific volume, the pvT-model is validated regarding its prediction accuracy by comparing the predicted specific volumes with specific volume measurements of molded test specimens using processing points with varying cooling rates. For the predictions of the final specific volumes, two approaches regarding the selection of the cooling rate were used. The results show that the selection of the cooling rate within the modified Tait model has a significant impact on the calculated final specific volume.Christian HopmannChenglong XiaoCemi E. KahveJan FellerhoffElsevierarticleInjection moldingSimulationModellingInline data acquisitionSpecific volumePolymers and polymer manufactureTP1080-1185ENPolymer Testing, Vol 104, Iss , Pp 107393- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Injection molding Simulation Modelling Inline data acquisition Specific volume Polymers and polymer manufacture TP1080-1185
spellingShingle	Injection molding Simulation Modelling Inline data acquisition Specific volume Polymers and polymer manufacture TP1080-1185 Christian Hopmann Chenglong Xiao Cemi E. Kahve Jan Fellerhoff Prediction and validation of the specific volume for inline warpage control in injection molding
description	The material-inherent specific volume behavior of polymers is highly important for producing dimensionally accurate injection molded parts since the shrinkage and the shrinkage-induced warpage are attributable to the specific volume behavior. Thereby, the prevalent process parameters melt temperature and cavity pressure significantly influence the prevailing specific volume. Many empirical models describe this pressure-specific volume-temperature (pvT) behavior.To minimize part warpage, a segmented dynamic mold temperature control has been developed which aims to homogenize the specific volume of a platen-shaped geometry. The mold temperature control is thereby controlled by a model predictive control concept, which predicts the local specific volume using an empirical pvT-model. A modified Tait-pvT-model is used for the prediction, which considers the effect of the cooling rate on the specific volume. To achieve homogenization of the local specific volume, the pvT-model is validated regarding its prediction accuracy by comparing the predicted specific volumes with specific volume measurements of molded test specimens using processing points with varying cooling rates. For the predictions of the final specific volumes, two approaches regarding the selection of the cooling rate were used. The results show that the selection of the cooling rate within the modified Tait model has a significant impact on the calculated final specific volume.
format	article
author	Christian Hopmann Chenglong Xiao Cemi E. Kahve Jan Fellerhoff
author_facet	Christian Hopmann Chenglong Xiao Cemi E. Kahve Jan Fellerhoff
author_sort	Christian Hopmann
title	Prediction and validation of the specific volume for inline warpage control in injection molding
title_short	Prediction and validation of the specific volume for inline warpage control in injection molding
title_full	Prediction and validation of the specific volume for inline warpage control in injection molding
title_fullStr	Prediction and validation of the specific volume for inline warpage control in injection molding
title_full_unstemmed	Prediction and validation of the specific volume for inline warpage control in injection molding
title_sort	prediction and validation of the specific volume for inline warpage control in injection molding
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/8873c903cd4c4542a362e591fd1ce548
work_keys_str_mv	AT christianhopmann predictionandvalidationofthespecificvolumeforinlinewarpagecontrolininjectionmolding AT chenglongxiao predictionandvalidationofthespecificvolumeforinlinewarpagecontrolininjectionmolding AT cemiekahve predictionandvalidationofthespecificvolumeforinlinewarpagecontrolininjectionmolding AT janfellerhoff predictionandvalidationofthespecificvolumeforinlinewarpagecontrolininjectionmolding
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Prediction and validation of the specific volume for inline warpage control in injection molding

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