Course Outcomes (COs):
On completion of the Course in Foundry
Technology, students will be able to:
- Indicate the factors to be considered while designing a casting incorporating adequate risering and suitable gating system.
- Suggest suitable techniques that can be employed during melt treatment, pouring and solidification to control the cast structure of metals.
- Suggest suitable moulding techniques, melting furnaces and foundry practices for ferrous and non-ferrous castings.
- Explain the recent advances and the use of modern technology in foundry industries.
Topic
Title
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Description
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Duration
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1. Foundry Metallurgy
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Oxidation of
liquid metals, gas dissolution in liquid metals, methods of degassing,
fluidity, factors affecting fluidity, fluidity tests, hot tearing, shrinkage
of liquid metals.
|
06 Hours
|
2. Casting Design
|
Introduction
to casting design, redesign considerations, design for minimum casting
stresses, design for directional solidification, design for metal flow,
safety factors, design for low pattern cost and model making as an aid in
design.
|
06 Hours
|
3. Solidification of Castings
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Crystallization
and development of cast structure - nucleation, growth and dendritic growth.
Structure of castings – significance and practical control of cast structure,
grain shape and orientation, grain size, refinement and modification of cast
structure. Concept of progressive and directional solidification,
solidification time and derivation of Chvorinov’s equation, influence on mold
characteristics and cast metal.
|
07 Hours
|
4. Risering and Gating
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Need
for risering, general considerations of risering, riser shapes, riser size,
and location. Requirements of a riser. Sand, insulating, and exothermic
materials used for risers. Riser feeding distance and theory of risering.
Internal chills, external chills, use of mould materials of different chill
capacities, padding for directional solidification. Open type and blind
risers. Riser treatment using exothermic and insulating compounds. Gating
system – theoretical consideration of gating, laws of fluid flow, turbulence
in gating system, use of ceramic foam filters in gating, need for tapered
sprue, gating ratio, simple problems.
|
07 Hours
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5. Special Moulding Techniques & Cupola Melting
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Principles,
materials used, process details and application of no-bake sand systems,
vacuum moulding, flaskless moulding, and high pressure moulding. Cupola
melting: Developments in cupola melting – hot blast cupola, water cooled
cupola, balanced blast cupola, cokeless cupola, cupola charge calculations
|
07 Hours
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6. Ferrous Foundry
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Melting
procedures, casting characteristics, production, specification, and
properties of some typical steels, grey cast iron, malleable iron, and
spheroidal graphite cast iron castings.
|
07 Hours
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7. Non-ferrous Foundry
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Melting
procedures, casting characteristics, production, specification, and
properties of some typical aluminum, copper, and magnesium based alloy
castings.
|
06 Hours
|
8. Modernization and Mechanization of Foundry
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Need for
modernization, and mechanization, moulding and core making, melting, pouring,
shake out equipment and fettling, dust and fume control, material handling
equipments for sand moulds and cores, molten metal and castings, reclamation
of sands. Pollution control – norms, and agencies.
|
06 Hours
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