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Casting Terminology. Mold cavity- combination of the mold material and cores. Riser-additional void in the mold that provides additional metal to compensate for shrinkage. Gating system- network of channels that delivers the molten metal to the mold.
Sand casting is a mold based net shape manufacturing process in which metal parts are molded by pouring molten metal into a cavity. The mold cavity is created by withdrawing a pattern from sand that
28 mar 2020 · casting process and sand casting. Two forms of mold: (a) open mold, simply a container in the shape of the desired part; and (b) closed mold, in which the mold geometry is more complex and...
Moulding sand: Sand, which binds strongly without losing its permeability to air or gases. It is a mixture of silica sand, clay, and moisture in appropriate proportions. Facing sand: The small amount of carbonaceous material sprinkled on the inner surface of the mould cavity to give a better surface finish to the castings. Important casting terms
Advantages of Casting • Complex shapes • Parts can have hollow sections or cavities • Very large parts • Intricate shaping of metals that are difficult to machine • Different mold materials can be used –Sand, metal, or ceramics • Different pouring methods
Sand casting is an economical method of producing metal parts in quantities from one-offs to high volume. It’s the nature of the process that sand cast parts will require machining.
Sand Casting: Process Capability • Process: molten metal poured into sand mold • Advantages: almost no limit on shape, weight, complexity or type of metal • Limitations: poorer tolerances and surface finish (compared to other casting processes), post-processing necessary, relatively slow cycle time
