4.+expendable+casting patterns
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Sand casting Expendable Mold Casting Pattern is permanent
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Sand casting
Expendable Mold Casting
Pattern is permanent
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• Gated pattern• Cope and drag Pattern• Match plate pattern• Loose piece pattern• Follow board pattern• Sweep pattern• Skeleton pattern
Single , Split, type
Match plate & Drag and cope type
In sketch: