Transactions of the Korean Society of Machine Tool Engineers (한국공작기계학회논문집)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
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Robust Design of the Gate System for Flatness Improvement in Semi-Solid Casting Processes

반응고 주조공정에서 평면도 증대를 위한 게이트시스템의 강건설계

  • Published : 2009.04.15
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Abstract

Semi-solid casting(SSC) of magnesium alloys is increasingly being used to produce high quality components. This process is similar to the injection molding of plastics and is called thixomolding. Using this process, higher strength, thinner wall sections and tighter tolerances without porosity are obtained. The high strength and low weight characteristics of magnesium alloys render the high-precision fabrication of thin-walled components with large surface areas. They are widely used for the IT, auto and consumer electronics industries. However, warpage of the thin-walled sections degrade quality of the parts produced in the SCC process. To produce thin-walled magnesium alloy parts, the geometry of gating system on the quality of the finished products should be clearly studied. In this paper, to minimize warpage of the thin-walled sections, Taguchi method is applied to the optimal design of the gate geometry in the thixomolding process. Width, height, length and angle of the gating system are selected for the robust design parameters. Effectiveness of the robust design is verified through the CAE software.

Keywords

References

  1. Kainer, K. U., 2003, Magnesium-Alloys and Technologies, WILEY-VCH Verlag GmbH & Co. Weinheim, Germany.
  2. Avedesian, M. M. and Baker, H., 1999, Magnesium and Magnesium Alloys (ASM Specialty Handbook), ASM International, Ohio, U.S.A.
  3. Sin, S. L. and Dube, D., 2004, "Influence of Process Parameters on Fluidity of Investment-cast AZ91D Magnesium Alloy," Material Science and Engineering A, Vol. 386, pp. 34-42.
  4. EI-Mahallawy, N. A., Taha, M. A., Pokora, E., and Klein, F., 1998, "On the Influence of Process Variables on the Thermal Conditions and Properties of High Pressure Die-cast Magnesium Alloys," Journal of Materials Processing and Technology, Vol. 73, pp. 125-138. https://doi.org/10.1016/S0924-0136(97)00221-5
  5. Wu, D. H. and Chang, M. S., 2004, "Use of Taguchi Method to Develop a Robust Design for the Magnesium Alloy Die Casting Process," Materials Science and Engineering A, Vol. 379, pp. 366-371, https://doi.org/10.1016/j.msea.2004.03.006
  6. Hu, B. H., Tong, K. K., Niu, X. P., and Pinwill, I., 2000, "Design and Optimisation of Runner and Gating Systems for the Die Casting of Thin-walled Magnesium Telecommunication Parts through Numerical Simulation," Journal of Material Processing Technology, Vol. 105, pp. 128-133. https://doi.org/10.1016/S0924-0136(00)00546-X
  7. Kwon, T. H., Moon, C. K., Kim, Y. H. and Choi, J. C., 2002, "A Study on the Design of Gating System for Semi-solid Diecasting Process," Journal of the Korean Society of Precision Engineering, Vol. 19, No. 8, pp. 116-125.
  8. Park, S. H., 2001, Modern Design of Experiments, Minyoungsa, Republic of Korea.
  9. AnyCasting Inc., 2002, viewed 7 October 2008, .
  10. Tang, S. H., Tan, Y. J., Sapuan, S. M., Sulaiman, S., Ismail, N., and Samin, R., 2007, "The Use of Taguchi Method in the Design of Plastic Injection Mold for Reducing Warpage," Journal of Materials Processing Technology, Vol. 182, pp. 418-426. https://doi.org/10.1016/j.jmatprotec.2006.08.025
  11. Spencer, D. B., Meharabian, R. and Flemings, M. C., 1972, "Rheological Behavior of Sn-15%Pb in the Crystallization Range," Metallurgical and Materials Transactions B, Vol. 3, pp. 1925-1932. https://doi.org/10.1007/BF02642580
  12. Fan, Z., 2002, "Semi-solid Metal Processing," International Materials Reviews, Vol. 47, No. 2, pp. 49-85. https://doi.org/10.1179/095066001225001076
  13. Park, K., Ahn, J. H. and Choi, S. R., 2001, "Optimal Design for Injection Molding Processes using Design of Experiments and Finite Element Analysis," Proceedings of the Korean Society for Technology of Plasticity Conference, pp. 150-153.