i) Why is the permeability of shell mold higher as compared to sand mold? ii)What type of die casting process is mostly preferable for higher production rate? Justify your answer. iii) Bauschinger effect can be reduced by the stress aging process. Justify your answer.
Q1.Write down your answer briefly.
i) Why is the permeability of shell mold higher as compared to sand mold?
ii)What type of die casting process is mostly preferable for higher production rate? Justify your answer.
iii) Bauschinger effect can be reduced by the stress aging process. Justify your answer.
iv) Why is the sand for foundry practice called green sand? Can it be used for the core making process?
v) What is moldability? How do you determine moldability of molding sand?
vi) Which casting process is usually preferred for producing long tubular objects? Is it possible to manufacture a solid and parallelepiped object having different dimensions in a centrifugal casting process? Justify your answer.
vii) What is directional solidification? How does a riser promote directional solidification?
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