Sand casting
Expendable Mold Casting
Pattern is permanent
Moulding Materials
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
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
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
Single piece pattern
Split pattern
Cope and Drag pattern
Match plate pattern
Follow board pattern
Loose piece pattern
Sweep pattern
Various types of gates
Mould cavityMould cavity Mould cavity
Top gating Bottom gating Parting line gating
Various furnaces used in FOUNDRY PRACTICE
• Blast Furnace
• BOF
• Cupola
• Oxygen Lance Furnace
• Electric Arc Furnace
• Induction Furnace
Crucible furnace
Cupola
Electric Arc Furnace
Induction furnace
Pouring vessel