I.1 Background The need for metals is not only limited to objects with flat surfaces. The need for metals is also growing rapidly along with the technology that supports it. Now we can produce metal objects in the form apaun without having to experience the process penenmpaan. In ancient times to get the highest metal complex brbentuk the object to be heated and
beaten as forging process in general. But with the progress of time the demand for increasing the metal requirements and the demands that have now been created furnace-blast furnace that is yielding a temperature above 1500 ° C location within the paper contained some kind of casting namely:
PERMANENT MOLD CASTING, CENTRIFUGAL CASTING, INVESTMENT CASTING, DIE CASTING, INJECTION MOLDING, BLOW MOLDING
That at least the reader will know a little about the casting.
CHAPTER II :
1. DEFINITIONS CASTING Casting is a manufacturing process that uses liquid metal and molds to produce parts with a shape that approximates the shape of the final geometry of the finished product. Molten metal will be poured or pressed into a mold having a cavity corresponding to the desired shape. After the molten metal meets the cavity and back to solid form, then cast the mold removed and the results can be used for secondary processes. Green sand casting used for about 75 percent of the 23 million tons of castings are produced in the USA each year.
Casting process itself can be divided into two kinds, namely traditional and non-traditional casting / contemporary casting.
Traditional techniques consist of:
1. Sand-Mold Casting