Browsing by Author "Gélin, Jean Claude"
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- ItemDirect observation of mould cavity filling in ceramic injection moulding(Technická Univerzita v Liberci, 2008) Dvořák, Pavel J.; Barrière, Thierry; Gélin, Jean ClaudeThe ceramic injection moulding process is largely used to manufacture 3D net shape components. So far the feedstock behaviours of the mixture of polymer binder and ceramic powder are not well described. In order to better understand the ceramic injection moulding process, a mould with transparent glass windows is manufactured in the laboratory to observe the melt flow during injection stage. The injection process is taken by a high speed CCD camera through the transparent glass windows. In this paper, injection moulding experiments have been performed to observe and compare the filling process, the effects of gate size and injection process parameters on occurrence of jetting have been studied. © 2008 Elsevier Ltd. All rights reserved.
- ItemJetting in metal injection moulding of 316L stainless steel(Maney Publishing, 2005) Dvořák, Pavel J.; Barrière, Thierry; Gélin, Jean Claude; yesThe jetting phenomenon in metal injection moulding (MIM) has been investigated. To date, the behaviour of the polymer metallic powder melting during filling stage that causes problems in choosing process parameters has not been adequately described in the literature, the manner of the melt flows inside a die cavity is not easy to predict. In order to better understand the process, an experimental mould with replaceable inserts including a window glass section was designed and manufactured in our lab. The glass window allows monitoring the manner of the melt flows in real time and permit to record it with a change couple device (CCD) camera. In this paper, the injection moulding experiments have been performed to test the filling process and occurrence of jetting. The experiments indicate that there is high probability of conventional jetting depending on process parameters. Various gate cross sections and runner length die cavity were employed as variable parameters in order to investigate their influence on jetting phenomenon. The processing regimes were kept the same during all the experiments. © 2005 Institute of Materials, Minerals and Mining. Published by Maney on behalf of the Institute.