International Journal of Naval Architecture and Ocean Engineering

The Society of Naval Architects of Korea (대한조선학회)
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A study on the S/W application for a riser design process for fabricating axisymmetric large offshore structures by using a sand casting process

  • Received : 2017.03.08
  • Accepted : 2018.08.20
  • Published : 2019.01.31
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Abstract

The effects of the location and dimension of the gate, location, and volume of the feeder, application of a chill, chill volume, and heating method of the feeder with respect to the effect of the mold-designing technologies on the defect status of the products are described. It is possible to increase the solidification time of the feeder by heating feeder. Furthermore, the pressure generated from the feeder is imposed on a product, and this decreases the generation of shrinkage porosities. In this study, two types of gating and feeding systems had been proposed: the bottom L-type junctions and the top L-type junctions. Additionally, solidification behaviors, such as solidification time, shrinkage porosities, weight percentage of chill system to product, hot spot, and solidification time ratio (=Solidification time of feeder/solidification time of product), are extensively analyzed by using commercial casting simulation software. Based on the solidification behaviors, reasonable mold design, feeding system, critical feeder heating temperature, and solidification time ratios are proposed in the sand casting process for the fabrication of carrier housing in order to reduce the casting defects and to increase the recovery rate.

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References

  1. Becker Marine Systems. 2015. Available online: http://www.becker-marine-systems.com (accessed on 29 April 2015).
  2. Campbell, J., 1991. Castings. Butterworth-Heinemann Ltd.
  3. Hu, B.H., Tong, K.K., Niu, X.P., Pinwill, I., 2000. Design and optimization of runner and gating systems for the die casting of thin-walled magnesium telecommunication parts through numerical simulation. J. Mater. Process. Technol. 105, 128-133. https://doi.org/10.1016/S0924-0136(00)00546-X
  4. Hsu, F.Y., Jolly, M.R., Cambell, J., 2009. A multiple-gate runner system for gravity casting. J. Mater. Process. Technol. 209, 5736-5750. https://doi.org/10.1016/j.jmatprotec.2009.06.003
  5. Jin, C.K., Seo, H.Y., Kang, C.G., 2017. Heating system for riser size minimizing in sand casting process and its experimental verification. Metals 7 (4), 130-141. https://doi.org/10.3390/met7040130
  6. Kim, T.W., Jin, C.K., Jeong, I.K., Lim, S.S., Mun, J.C., Kang, C.G., Seo, H.Y., Kim, J.D., 2015. Integral steel casting of full-spade rudder trunk Carrier housing for supersized container vessels through casting process engineering (Sekjin E&T). Metals 5, 706-719. https://doi.org/10.3390/met5020706
  7. Lagad, P.P., 2014. Air entrapment analysis of casting (turbine housing) for shell moulding process using simulation technique. Int. J. Eng. Res. Gen. Sci. 2, 143-149.
  8. Lee, H.C., Seo, P.K., Jin, C.K., Seo, H.Y., Kang, C.G., 2017. Fabrication technology of turbo charger housing for riser minimizing by fusion S/W application and its experimental investigation. J. Korea Foundry Soc. 37 (1), 1-13. https://doi.org/10.7777/jkfs.2017.37.1.1
  9. Lee, H.S., Kwon, H.W., 2003. Effect and fading behavior of inoculant in the cast iron melt. J. Korea Foundry Soc. 23 (3), 20-27.
  10. Lee, S.M., Shin, H.C., Shin, J.S., Moon, B.M., 2005. Control of abnormal graphite structure in heavy section ductile cast iron. J. Korea Foundry Soc. 25 (1), 40-50.
  11. Park, J.J., Seo, G.S., Kwon, H.W., 2009. Effect of heat treatment condition on the processing window of 3.60wt%C - 2.50wt%Si - 0.80wt%Cu austempered ductile cast iron. J. Korea Foundry Soc. 29 (2), 36-44.
  12. Tavakoli, R., Davami, P., 2009. Feeder growth: a new for automatic optimal feeder design in gravity casting process. Struct. Multidiscip. Optim. 39, 519-530. https://doi.org/10.1007/s00158-008-0340-6
  13. Todorov, R.P., Khristov, KhG., 2004. Widmanstatten structure of carbon steels. Mater. Sci. Heat Treat. 46, 49-53. https://doi.org/10.1023/B:MSAT.0000029601.58461.bd