Code No: 321853 III-B.Tech. II-Semester Supplementary Examinations, May-2004 FOUNDRY TECHNOLOGY (Metallurgy and Material Technology) Max. Marks: 70 Answer any FIVE questions All questions carry equal marks ---
b) 2.a) b)
Identify the important problems/challenges in the Indian metal casting industry. Give your suggestions to over the same. Name & explain the important industries using casting. Give typical examples.
Upon What factors does the choice of an adequate foundry sand depend? Explain them. Explain the importance of permeability in sand molds. What are the differences between green strength, dry strength and Hot strength?
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3.a) Discuss the various factors to be considered for die costing design? b) Name various types of die casting dies. Also explain the factors that affect the selection of die. What do you mean be feeding distance? Explain in detail on shape, size, location and feeding distance of risers.
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5.a) Derive an expression for critical nucleus size during nucleation. b) Distinguish between progressive solidification and directional solidification. 6.a)
Draw a simple sketch of cupola. Label the principal sections of the furnace. Describe briefly its operation. b) Explain the necessary precautions to be taken during melting of Aluminium alloys. Explain salient features of continuous casting with a sketch. Explain with suitable justification whether it can be used for normal shaped casting or not.
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Explain why the following are encountered in foundries. Suggest suitable remedial measures in each case. a) Sand expansion defects b) Mold dilation c) Burn on d) Metal Mold reaction.
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c) What is the effect of 'under cooling' on critical radius? d) Can you expect the aforesaid in the actual practice? Justify. 6. Distinguish clearly between · a) Cold chamber and Hot chamber Die casting. b) Full mould process and Lost wax process. c)
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