-Casting is a 6000-year-old process; the earliest example of casting is a copper frog cast is in Macedonia in 32000 BC
-Casting is done by pouring hot metal into a mold; the mold is a hollow form that is shaped into what you want the object you are casting to look like.
- There are 2 major types of casting, expandable and non expandable.
-Expandable mold casting includes sand, plastic, shell, plaster, and investment (lost wax) moldings. The molds used in these processes are non-reusable.
-Non-Expandable casting includes permanent, die, centrifugal, and continuous casting.
-Die-casting was invented in 1838 for producing moveable type.
-Centrifugal casting is done when casting silver; the mold is held at arms length and then spun to ensure a successful pour. It is also used when casting glass objects like marbles.
-Continuous casting is the process whereby molten metal is solidified into a "semi finished" billet, bloom, or slab for subsequent rolling in the finishing mills. It is more economical and cost affective than casting first into ingots.
-Sand casting is one of the most popular types of casting, and has been used for centuries. Sand casting allows for smaller batches to be made compared to permanent mold casting and at a very reasonable cost. Not only does this method allow manufacturers to create products at a low cost, but there are other benefits to sand casting, such as very small size operations.
Bibliography
-Blair, Malcolm; Stevens, Thomas L. (1995), Steel castings handbook (6th ed.), ASM International, ISBN 9780871705563 http://books.google.com/books?id=QG3_QqmPZ_AC
-Kalpakjian, Serope; Schmid, Steven (2006), Manufacturing Engineering and Technology (5th ed.), Pearson, ISBN 0-13-148965-8.
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