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http://dx.doi.org/10.7317/pk.2012.36.6.685

Analysis of Cavity Pressure for Packing Conditions in Injection Molding of a Deep Depth Product  

Kim, Dong Woo (Seoul National University of Science and Technology, Jaeyoung Solutech Co. Ltd.)
Kang, Mina (Seoul National University of Science and Technology, KET Co.)
Kim, Hyeok (Department of Mechanical System Design Engineering, Seoul National of University of Science and Technology)
Lyu, Min-Young (Department of Mechanical System Design Engineering, Seoul National of University of Science and Technology)
Publication Information
Polymer(Korea) / v.36, no.6, 2012 , pp. 685-692 More about this Journal
Abstract
Injection molding operation consists of phases of filling, packing, and cooling. The highest cavity pressure is involved in the packing phase among the operation phases. Thus the cavity pressure largely depends upon velocity to pressure (v/p) switchover timing and magnitude of packing pressure. Developed cavity pressure is directly related to stress concentration in the cavity of mold and it may cause a crack in the mold. Consequently control of cavity pressure is considered very important. In this study, cavity pressure was analyzed in terms of v/p switchover timing and packing pressure through computer simulation and experiment. Cavity pressure was increased as the v/p switchover timing was delayed. Residual pressure after cooling phase was observed when the v/p switchover timing was late, which was due to increased pressurizing time for long filling phase. Cavity pressure was increased proportionally with the packing pressure. Residual pressure after cooling phase was also observed, and it was increased with increasing packing pressure. High cavity pressure and residual pressure have been observed at late v/p switchover and high packing pressure. Compared with simulation and experimental results, the profiles of pressures were very similar however simulation could not predict residual pressure. Packing condition was important for the control of cavity pressure and the optimum condition could be set up using CAE analysis.
Keywords
deep depth product; injection molding; v/p switchover timing; packing pressure; residual pressure;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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