Olein palm oil as a binder in core making process - a study / Ahmad Nazri Hamzah and Kamarudin Mohd. Tahir

Casting is one of the most important of the manufacturing processes. In many cases, cast parts are ready for use as they come from the casting process, but more often they require subsequent machining and finishing. Machining a block of metal to an intricate shape can be very expensive. High rates of production, good surface finish, small dimensional tolerances and improved properties of materials have enabled both large and small intricate parts to be cast of almost all metals and their alloys. Casting are made of many different metals and alloys which each metal requires the use of a specific shrinkage allowance in the construction of the pattern. The type and the number of casting that are to be made from a pattern are factors which determine the kind of material to be used for the construction of the pattern. When a casting is to have a cavity or recess in it such as a hole for a bolt, some form of core must be introduced into the mold. A core is sometimes defined as "any projection of the sand into the mold". This projection may be formed by the pattern itself or made elsewhere and introduced into the mold after the pattern is withdrawn. Either internal or external surface of a casting can be formed by a core.