Analysis of Cavity Pressure and Dimension of Molded Part According to V/P Switchover Position in Injection Molding

• Published in: Elastomers and composites Vol. 52; no. 4; pp. 309 - 316
• Main Authors: Cho, Jung Hwan, Kwon, Soon Yong, Roh, Hyung Jin, Cho, Sung Hwan, Kim, Su Yeon, Lyu, Min-Young
• Format: Journal Article
• Language: Korean
• Published: 한국고무학회 01.12.2017
• Subjects: cavity pressure; computer simulation; deformation; injection molding; V/P switchover; 고분자공학; computer simulation; deformation; V/P switchover; injection molding; cavity pressure
• ISSN: 2092-9676; 2288-7725
• DOI: 10.7473/EC.2017.52.4.309

In injection molding, the quality of an injection molded product varies greatly depending on the molding con-ditions. Many researche studies have been conducted on the quality analysis of molded parts according to the molding con-ditions such as injection pressure, injection temperature, and packing pressure. However, there have not been many studies on the V/P switchover timing. It is known that when a large pressure is applied to a cavity in the packing phase, the cavity pressure is most affected by the packing pressure. In addition, depending on the position (timing) of the packing pressure, it can have a direct influence on quality based on the shrinkage and dimensions of the molded parts. In this study, the change in pressure profile in the cavity according to the V/P switchover position is confirmed. A CAE analysis program (Moldflow) was used to simulate and analyze two models using the PC and PBT materials. In order to compare these results with the actual injection molding results, injection molding was performed for each V/P switchover position, and the correlation between simulation and experiment, especially for the shrinkage of molded parts, was evaluated.