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Sand casting. Steps: 1.Mechanical Drawing of the part 2. Making pattern- about pattern material.

Sand casting. Steps: 1.Mechanical Drawing of the part 2. Making pattern- about pattern material. 3.Making cores- if needed 4.Preparing drag and cope. (Setting the core, positioning etc.) 5.Removal of pattern 6Assembling cope and drag 7.Pouring- factors, method, etc. 8.Casting removed

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Sand casting. Steps: 1.Mechanical Drawing of the part 2. Making pattern- about pattern material.

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  1. Sand casting. Steps: • 1.Mechanical Drawing of the part • 2. Making pattern- about pattern material. • 3.Making cores- if needed • 4.Preparing drag and cope. (Setting the core, positioning etc.) • 5.Removal of pattern • 6Assembling cope and drag • 7.Pouring- factors, method, etc. • 8.Casting removed • 9.Trimming etc. • 10. READY FOR SHIPMENT

  2. 1.Mechanical Drawing of the part2. Making pattern- about pattern material.3.Making cores- if needed4.Preparing drag and cope. (Setting the core, positioning etc.)5.Removal of pattern6Assembling cope and drag7.Pouring- factors, method, etc.8.Casting removed9.Trimming etc.10. READY FOR SHIPMENT Some basics you had in Foundry 3 1 2 3a 3c 3b 4b 5a 4a 5b 6 8&9 10

  3. DISADVANTAGES • Cast product properties inferior in many cases when compared with other manufacturing processes. • Elevated temperature working in castings, as material has to be melted. • Thin section limitations exist. • For number of components very small, casting not preferred.

  4. SIGNIFICANT FACTORS- • TYPE OF METAL, • THERMAL PROPERTIES OF BOTH THE METAL AND MOULD, • GEOMETRIC RELATIONSHIP BETWEEN THE VOLUME AND SURFACE AREA ,AND • SHAPE OF MOULD.

  5. SOLIDIFICATION OF METALS • After pouring molten metal into mould, series of events takes place during solidification and cooling to ambient temperature. • These events greatly influence the size, shape, uniformity of the grains formed, and thus the over alll properties.

  6. The liquid Metal has a Volume"A”It solidifies to solid with a new volume "B"The solidified casting further contracts (shrinks)  through the cooling process to Volume "C" Three Stages of Contraction (Shrinkage)

  7. COOLING CURVE For pure metal or compound TEMPERATURE Cooling of Liquid Latent heat of solidification given off during freezing- At constant temperature Freezing begins Freezing ends Liquid + Solid Cooling of solid Liquid Solid TIME, log scale

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