2. mold pattern-gating

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2. mold pattern-gating

  1. 1. Expendable Mold Casting Sand casting Pattern is permanent
  2. 2. Moulding Materials
  3. 3. 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
  4. 4. 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
  5. 5. 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
  6. 6. Single piece pattern Split pattern
  7. 7. Cope and Drag pattern Match plate pattern
  8. 8. Follow board pattern Loose piece pattern Sweep pattern
  9. 9. Various types of gates Mould cavity Top gating Mould cavity Bottom gating Mould cavity Parting line gating
  10. 10. Various furnaces used in FOUNDRY PRACTICE • Blast Furnace • BOF • Cupola • Oxygen Lance Furnace • Electric Arc Furnace • Induction Furnace
  11. 11. Crucible furnace
  12. 12. Cupola
  13. 13. Electric Arc Furnace
  14. 14. Induction furnace
  15. 15. Pouring vessel

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