What are the different types of casting?

There are many types of casting materials used in the production of sculptures or mechanical parts that can be too complicated to be able to use other techniques. Different types of material in liquid form or liquefied form are poured into a casting or mold, which contain a hollowed area in the form of the desired part or item, and then they are hardening into a solid mold. One of the oldest types of casting materials is sand, which is used to create a single large pressed object. Urethan rubber is used in the process of casting concrete and other aggregated materials for use in indoor and outdoor applications. Gypsum is the main ingredient used for casting materials made of different types of metal with low stretching. Because the form is destroyed after each use, this type of cast is best for manufacturers who only need a few -formed items. The sand used in the casting of sand is held together by means of chemical binders, clay or certain types of polymeRied oils. Molds are also used in casting very large parts. For example, the entire steel frame for a railway car, bulldozer or ship can be made of a single sand castle.

Urethan rubber is one of the most durable of all casting materials and is used primarily for items from concrete or other aggregates that will be exposed to elements. As with casting materials such as plaster, the model is made and the urethan rubber has been poured or formed around the model. After allowed to dry, Urethan is carefully extracted from the model and creates a negative form of the item. After the concrete is poured into the mold, it is subjected to vibrations that attract air bubbles away from the concrete surface and create a smooth surface that allows urine to easily pull. The WetCast Concrete process uses rubber forms to create smaller decorative objects such as backrest blocks, medallions, cornice pressing, balusTery and finishes.

Like sand casting, the casting of plaster uses the same basic techniques, except that the plaster of Paris is used instead of sand. In some cases, plaster casting materials allow more than one cast. The model or item model is created by pouring the plaster around the part, resulting in a negative mold or plaster. The mold is then poured into molten metal or other liquid material to make the final part. The excess plaster is removed by mechanical knock-out and pressure water jets. The casting materials of this kind are only able to handle non -colored metals with a low melting point such as copper, aluminum and zinc.