Metal Casting is just one of the procedures that have been formulated to shape and build items and components over the years. The usage of Casting as a manufacturing process by which a liquid material is usually poured into a mold, which contains a hollow cavity in the required form, and then permitted to cool has allowed for the reproduction of identical objects when fabricated from the same original mold (or mould).
The finished product or solidified part is also known as a 'casting', which is removed from the mold (at times broken out of the mold) to complete the metal casting activity. Although the substance utilized in casting are usually metals, various resources such as, plaster, epoxy, concrete and clay are often employed.
The process of Casting is consequently excellent for creating and reproducing complex designs and objects that would usually be either too expensive or too complicated to create.
The procedure of Casting has been with us for a very long time (over 6000 years) and it is even now regularly being developed and amended with new composites and metals that are capable of withstanding a tremendous spectrum of temperature and pressure tolerances.
The particulars of Metal Casting involve the process of the design and generation of the target mould. The skills and instruments essential for mold construction are in themselves a comprehensive area that is covered in other articles. But let us presume that the required mold has been created that contains a hollow cavity of the desired form and size and has been made from a substance that has the characteristics to endure the heat and pressure of the molten (or liquid) metal to be poured into it.
In the course of the solidification activity, the target object takes shape and when totally cooled or set the item is then ready for removal from the mould ready for the finishing process. It is during this cooling procedure that any anomolies will arise and tremendous consideration is taken over gas porosity and shrinkage during this key phase of building the metal cast. Once the cast has been generated, depending on the end application of the item, the finishing activity will eradicate any aberrations and apply the required polishing. This final target product is often known as the casting.
Further to this elementary definition of Metal Casting there are other categories of this approach, namely Expendable and Non-expendable Casting which may be further sub divided by the material utilized for the mold and the pouring method used to create the metal cast.
Examples of these sub-categories are Sand Casting, Lost Wax, Gravity, Vacuum and Low Pressure Casting. All of these methods have been created and improved over the years to offer a large choice of techniques with their resultant casts they are ideally suited to deliver the cost effective manufacturing of a metal object that would typically be too difficult to manufacture in any other manner. Thus the oldest surviving metal casting (a frog from 3200BC) was just one of various objects that its creators manufactured using Metal Casting when no other way seemed possible, and this continues today.