Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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A Gating System Design to Reduce the Gas Porosity for Die Casting Mobile Device

다이캐스팅 모바일 기기의 기공결함 감소를 위한 유동구조 설계

  • Jang, Jeong Hui (Graduate School of Mechanical System Engineering, Kumoh National Inst. of Technology) ;
  • Kim, Jun Hyung (Core Technology R&D Team, Samsung Electronics) ;
  • Han, Chul Ho (Graduate School of Mechanical System Engineering, Kumoh National Inst. of Technology)
  • 장정희 (금오공과대학교 일반대학원 기계시스템공학과) ;
  • 김준형 (삼성전자 생산기술연구소) ;
  • 한철호 (금오공과대학교 일반대학원 기계시스템공학과)
  • Received : 2020.10.30
  • Accepted : 2020.11.24
  • Published : 2021.02.28
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Abstract

Usually, the die-cast components used in small mobile devices require finishing processes, such as computer numerically controlled coating. In such cases, porosity is the most important defect. The shape of the molten aluminum that passes through the runner and gate in a mold is the one of the factors that influences gas porosity. To define the spurt index, which numerically indicates the shape of molten aluminum after the gate, Reynolds number and Ohnesorge number are used. Before die fabrication, computer-aided engineering analysis is performed to optimize the filling pattern. Finally, X-ray and surface inspection are performed after casting and machining to evaluate how the spurt index affects porosity and other product parameters. Based on the results obtained herein, a new gating system design process is suggested.

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References

  1. William, G. W., Die Casting defects - Trouble shootings Guide, NADCA Kindle Edition, pp. 11-19, 2013.
  2. Hwang, I. H., Lee, W. S., Cho, J. H., Park, I. S., Heo, M. W., Jung, H. Y., Lee, J. C., "A Study on the Development of Die-Casting Technology for Minimum Gas Hole Defect of Aluminum Automobile Parts", The Korean Society of Manufacturing Process Engineers, pp. 135, 2018.
  3. Herman, E. A., Gating Die Casting Die, NADCA, pp. 21, 1996.
  4. William, G. W., Die Casting Defects - Causes and Solutions, NADCA Kindle Edition, pp. 35-45, 2007.
  5. Ramnath, B. V., Elanchezhian, C., Chandrasekhar, V., Kumar, A. A., Asif, S. M., Mohamed, G. R., Raj, D. V., Kumar, C. S., "Analysis and Optimization of Gating System for Commutator End Bracket", Procedia Materials Science 6, pp. 1312-1328, 2014. https://doi.org/10.1016/j.mspro.2014.07.110
  6. Raveendran, N. A. K., Patil A. N., "Optimization of Runner Design in Pressure Die Casting", International Journal of Engineering Research & Technology Vol. 6, pp. 394-396, 2017.
  7. Chimani, C. M., Kretz, R., Schneiderbauer, S., Puttinger, S., Pirker, S., "Studies on Flow Characteristics at High-Pressure Die-Casting", Materials Science and Engineering 27, 2011.
  8. Kang, H. J., Park, J. H., Kim, E. S., Yun, P. H., Park, I. M., "Effect of the Plunger Velocity and the Fast Shot Set Point on the Gas Porosity during ADC12 Plate Die Casting", Korean journal of metals and materials, Vol. 54, No. 2, pp. 145-153, 2016. https://doi.org/10.3365/kjmm.2016.54.2.145
  9. McKinley, G. H., Renardy, M., "Wolfgang von Ohnesorge", Physics OF Fluids, 23, pp. 2-5, 2011.