Presented by Karthick.C METAL CASTING Presented by Karthick.C

CASTING Casting is a manufacturing process in which the liquid molten material is poured into a mould. Where mould is a hollow cavity of having required shape and dimension to hold the molten metal to produce a sound component to meet the required service conditions.

IMPORTANCE OF CASTING Simple method to produce large and very complex parts Low cost method New models or prototypes can be produced It offers complete range of mechanical properties

STAGES IN CASTING Pattern making Mould and core making Melting and casting Fettling Testing and inspection

MOULDING SAND The principal ingredients of moulding sand are silica sand grains, clay and moisture. Refractoriness Chemical resistivity Permeability flowability

TYPES OF MOULDING SAND Green sand mould Dry sand mould Loam sand moulding Oil sand moulding Facing sand Parting sand

TESTING OF MOULDING SAND Grain size Clay content test Moisture content test Permeability test Shatter test

MELTING FURNACES Cupola furnace Crucible furnace Open hearth furnace Blast furnace

TYPES OF CASTING PROCESS Shell mould casting Investment casting Ceramic mould casting Pressure die casting Centrifugal casting Continuous casting Stir casting

SHELL MOULD CASTING

CERAMIC MOULD CASTING

PRESSURE DIE CASTING

CENTRIFUGAL CASTING

CONTINOUS CASTING

STIR CASTING

DEFECTS IN CASTING

Shrinkage Scab Swell Cracks mismatch

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