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A Study on the Filling Imbalance in a Geometrically Balanced Injection Mold  

구양 (부경대학교 기계공학부)
김병탁 (부경대학교 기계공학부)
정영득 (부경대학교 기계공학부)
한성렬 (부경대학교 기계공학부 대학원)
한규택 (부경대학교 기계공학부)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.28, no.6, 2004 , pp. 931-937 More about this Journal
Abstract
Simultaneous filling is a goal in plastic injection mold that has multi cavities. The moldings which have not been filled at the same time have undesired faults such as dimension inaccuracy, residual stress, law mechanical strength, etc. The best way to simultaneous fill is to be injected in a geometrically balanced runner system. In a general processing, however, in balanced runner system mold, filling imbalance would be observed in cavities. These phenomena result from molten polymer's characteristics and circumstances in balanced runner. In this study, the degree of filling imbalance (DFI) was defined for showing rate of filling imbalance in geometrically balanced injection mold that has 8 cavities. Before the main experiment, an injection molding simulation was conducted to know a pattern of filling imbalance with Moldflow software. There were somewhat differences between results of experiment and simulation about the filling imbalance. The reason for the difference was that the software have not concerned about a situation in a real flow channel. It was also investigated how the injection speed affected on filling imbalance in the experiment.
Keywords
Injection molding; Filling imbalance; Degree of filling imbalance; Moldflow; Injection speed;
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