A numerical model to predict the powder–binder separation during micro-powder injection molding |
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Authors: | Sk Tanbir Islam Sudip K Samanta Santanu Das Himadri Chattopadhyay |
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Affiliation: | 1. Mechanical Engineering Department, Jadavpur University, Kolkata, 700032 India;2. CSIR-Central Mechanical Engineering Research Institute, Durgapur, 713209 India;3. Mechanical Engineering Department, Kalyani Government Engineering College, Kalyani, 741235 India |
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Abstract: | The micro-powder injection molding (micro-PIM) process has the potential to bridge the gap between the design and manufacturing of micro-components that are often used in small and handy devices. Numerical modeling helps to analyze and overcome various difficulties of micro-PIM. In the present work, a numerical model is developed to predict the powder–binder separation (a common defect in PIM and especially severe in micro-PIM) during the injection of an alumina feedstock. A powder–binder separation criterion is proposed dealing with applied injection pressure and friction force between the powder and binder. An indirect comparison of feedstock travel time between two locations is used to validate the model. The predicted segregation from the simulated result is supported by a qualitative experimental measurement. The developed model can be used to optimize injection parameters to get a defect-free product. |
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Keywords: | alumina feedstock dynamic mesh micro-PIM powder–binder separation |
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