2. mold pattern-gating
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Transcript of 2. mold pattern-gating
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Sand casting
Expendable Mold Casting
Pattern is permanent
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Moulding Materials
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Testing of moulding sand properties
• Moisture content
• Clay content
• Sand grain size: determining the grain fineness number (GFN)
• Permeability– Specimen preparation– Standard definition
• Strength– Green strength– Dry strength
• Mould hardness
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Pattern making
Materials:
Properties:low cost, low weight, easy formability, less dimensional changes, surface finishSize of casting, number of casting, dim. accuracy
• Wood: pine, teak, walnut• Metal: aluminium alloys, grey cast iron, steel• Plastic: poly urethine foam
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Types of patterns
• Single piece pattern• Split pattern• Cope and drag Pattern• Match plate pattern• Loose piece pattern• Follow board pattern• Sweep pattern• Skeleton pattern
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Single piece pattern
Split pattern
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Cope and Drag pattern
Match plate pattern
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Follow board pattern
Loose piece pattern
Sweep pattern
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Various types of gates
Mould cavityMould cavity Mould cavity
Top gating Bottom gating Parting line gating
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Various furnaces used in FOUNDRY PRACTICE
• Blast Furnace
• BOF
• Cupola
• Oxygen Lance Furnace
• Electric Arc Furnace
• Induction Furnace
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Crucible furnace
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Cupola
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Electric Arc Furnace
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Induction furnace
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Pouring vessel