Post solidification intensive riser cooling method (PSIRC) was proposed, in which risers were cooled by forced air or water spray after the solidification of a casting, turning risers into cooling pas-sages during the cooling process of castings in contrast to feeding passages during the solidification process. It may improve production efficiency and reduce residual stress and deformation.

1. Course- SEMINAR 1 ( MTTH199)
intensive riser cooling of casting after solidification
BY LOKESH BAVISKAR (M1754005)
Guided by-
DR. R.S.MAURYA
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2. INTRODUCTION
 CENTRAL IDEA
 NON UNIFORM TEMPERATURE
DISTRIBUTION
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3. LITERATURE REVIEW
Efficient and economical manufacture of
heavy steel castings
Yu, H.L., Kang, J.W., Huang, T.Y., 2010.
HIGH THERMAL GRADIENT
RESIDUAL STRESS OR DEFORMATION
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4. LITERATURE REVIEW
Developing a localized squeeze cooling technique
for improved casting solidification
Singh, D., Navaneeth, V., Lee, J., 2011
air gap between the casting/mold interface
Movable water-cooled chill
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5. LITERATURE REVIEW
Thermal and grain-structure simulation in a land-
based turbine blade directionally solidified with the
liquid metal cooling process
Kermanpur, A., Rappaz, M., Varahram, N., Davami,
P., 2000
LMC process
Heat by conduction and natural convection
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6. LITERATURE REVIEW
The ablation casting process
Grassi, J., Campbell, J., Hartlieb, M., Major, F., 2009
AIR GAP CONTROL RATE OF COOLING
ABLATION CASTING TECHNOLOGY
HIGH CHILL RATE
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7. LITERATURE REVIEW
Finite-element analysis on thermomechanical
behavior of a marine propeller casting in the
sand-casting process
Lee, S.M., Lee, W.J., 2005
Rapid but uneven cooling
martensitic phase transformation at low temperature
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8. Post solidification intensive riser cooling8

9. Close loop PSIRC system9

10. Case study 1: stress frame specimen
 Pair of casting (700 ˚c)
 Compressed air
at speed Of
25 m/s (5 atm)
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11. Numerical simulation11

12. Comparison of temp fields12

13. Case study 2: a hydro turbine blade13

14. Results and analysis
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15. 15
0.25h
17.8 h
30 h

16. Effect of PSIRC on mechanical properties16

17. Conclusions
Post solidification intensive riser cooling method
(PSIRC) was proposed, in which risers were cooled
by forced air or water spray after the solidification of
a casting, turning risers into cooling pas-sages
during the cooling process of castings in contrast to
feeding passages during the solidification process. it
may improve production efficiency and reduce
residual stress and deformation.
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18. Conclusions
The cooling speed of a stress frame specimen
casting increased apparently and its temperature
uniformity was improved under PSIRC
One day was saved for a hydro turbine blade
casting of 0.9ton melt before shakeout under PSIRC.
The strength and hardness at the riser bottom were
improved; meanwhile, its residual stress was greatly
reduced
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