15 November 1996 Ultrasonic monitoring of injection molding and die casting
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On-line ultrasonic monitoring of polymer injection molding and aluminum die casting are presented. The flow front of molten polymer and aluminum inside the mold has been proved by a multiple-channel acquisition system with a time resolution up to 1 ms. This information may be used to control the plunger movement. The gap development, due to the shrinkage of the part in the mold, and the part solidification are also monitored for the understanding of the cooling process. As expected, it is observed that thicker sections take longer times to solidify. For injection molding, the relation between the gap formation time and packing pressure has been investigated. Since the temperature of molten aluminum is around 700 degrees C, ultrasonic waveguides are inserted into the die for the monitoring.
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Bin Cao, H. Wang, Cheng-Kuei Jen, N. T. Nguyen, J. Legoux, Chee Ang Loong, Martin Viens, "Ultrasonic monitoring of injection molding and die casting", Proc. SPIE 2948, Nondestructive Evaluation for Process Control in Manufacturing, (15 November 1996); doi: 10.1117/12.259196; https://doi.org/10.1117/12.259196

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