4.+expendable+casting patterns

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4.+expendable+casting patterns

  1. 1. Expendable Mold Casting Sand casting Pattern is permanent
  2. 2. Pattern making Materials: Properties: low cost, low weight, easy formability, less dimensional changes, surface finish Size of casting, number of casting, dim. accuracy • Wood: pine, teak, walnut • Metal: aluminium alloys, grey cast iron, steel • Plastic: poly urethine foam
  3. 3. 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
  4. 4. Single , Split, type
  5. 5. Match plate & Drag and cope type
  6. 6. In sketch:
  7. 7. Follow board pattern

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