Explain investment casting.
What will be an ideal response?
Investment casting is a form of sand casting that can be used to create relatively intricate shapes with good accuracy. This process begins with the fabrication of a wax master form that is geometrically nearly identical to the desired production part. The wax master is then repeatedly dipped in slurry that is composed of finegrained sand with a binder such as clay or cement. Allowing the slurry to dry, or set, between each dip forms a thick-walled mold. The set mold is then fired to dramatically improve its strength, hardness, and temperature resistance. This step also melts the wax master, which runs out of the mold through a hole. Metal is then poured into the mold to replace the wax. After the metal hardens, the mold is broken to retrieve the part. Investment casting can easily create feature geometries that are accurate to within 0.25 mm, whereas accuracy to within 0.025 mm is considered difficult.
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