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- 저자 : 정휘권(H.K. Jung) (검색결과 3 건)
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정휘권(H.K. Jung),김현수(H.S. Kim),한병윤(B.Y. Han),박형구(H.K. Park) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
Recycling process of melted resin after the injection molding is getting popularto reduce the waste of material. It uses two rollers to make the remaining resin into plastic panels. Analysin the thermal/fluid behaviour of the melted resin is important in the roller process. For this the flow analysis of the gravity driven resin has been done between the rotating rollers with constant speed. The temperature of the roller surface which was contacted with resin and the ambient air cyclically was obtained and it was used as the thermal boundary conditions for the thermal behaviour of the resin. The obtained steady-state results showed a reverse flow in the central part in between the rollers. The temperature of the plastic surface was reduced sharply to the one of the roller surface after it was temperature change was slow inner part of the resin due to the phase changing process.
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김현수(H.S. Kim),정휘권(H.K. Jung),한병윤(B.Y. Han),박형구(H.K. Park) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
The injection molding process is suitable for manufacturing the complicated plastic products. As the customer needs for higher quality products increase, realization of precise dimensional and shape controls is getting more important, For this it is important to obtain uniform cooling procedure over the whole surface of high temperature molded plastic. Failure to this can leads to different shrinkage speed, internal stresses and unwanted shape deformations. It needs to distribute coolant flow rates to main channel and to sub-channels properly for insuring uniform cooling process when there are parallel cooling channels. In this study, three-dimensional turbulent flow simulations for representative parallel cooling channels were performed. To insure intended flow rate to each sub-channels various shape designs for channel system were investigated. The results show that as the Reynolds number increases the effect of shape design are more profound. Through the proper flow distribution, uniform cooling effects would be expected.
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김현수(H.S. Kim),정휘권(H.K. Jung),한병윤(B.Y. Han),김영만(Y.M. Kim),박형구(H.K. Park) 한국전산유체공학회 2012 한국전산유체공학회지 Vol.17 No.3
The injection molding process is suitable for manufacturing complicated plastic products. As the customer request higher quality products increase, realization of the precise dimensional and shape controls is getting more important. For this purpose it is important to obtain uniform cooling procedure over the whole surface of the high temperature molded plastic. Failure to this may lead to different shrinkage speed, internal stresses and unwanted shape deformations. It is necessary to distribute coolant flow rates to the main channel and to the sub-channels properly to insure uniform cooling process when there are parallel cooling channels. In this study, three-dimensional turbulent flow simulations for representative parallel cooling channels were performed. To insure the intended flow rate to each sub-channels, various shape designs for the channel system were investigated. The results show that as the Reynolds number increases the effect of shape design is more profound. Through the proper flow distribution, uniform cooling effects would be expected.
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