Castings

Casting is a manufacturing process in which a liquid material is usually poured into a mould which contains a hollow cavity of the desired shape and then allowed to solidify. The origin of casting is 7000 years back. The use of metal ornament was characterized instruments and instead of stone. The axes and hammers factor-made from copper were utilized. Casting is most often used for making complex shapes that would be difficult or uneconomical to make by other methods. Heavy equipment like machine tool beds, can be cast easily in the required size rather than fabricating by joining several small pieces. Casting is 7000year old process the oldest casting is copper frog (it casted in copper is oldest living proof of intricate patterns used as early as 3200 B C). Casting meaning Casting is the process of giving shape to or reproducing an object by pouring its material in liquid form into a mould. Casting is the process of the melting metal and pouring it into a cavity that has been moulded on a pattern into a desired shape. The metal is allowed to cool and solidified. The solidified metal is called the “Casting”. usually castings are manufactured in a commercial set up called “Foundry”. Origin of casting A casting is the essential foundation of civilization. With it, man unlocked his future, placing him on the path toward conquering his environment. History tells us this happened Mesopotamia, today’s modern Iraq. The oldest casting in existence today is believed to be a frog, cast in copper. The frog’s complexity indicates that in th was preceded by other simpler casting efforts. Things went slow back then. Tin, came around in the 16 century, but man used earth’s ores4500 years prior to this. The Chinese got the nod for iron castings in around 1000 B.C. India made steel in about 500 B.C. Civilization in general was casting brass by then, (brass=copper+ zinc), which was many centuries before the Christian era. All along this path all the techniques for “CASTING AND MOULDING PROCESSES’’ were being discovered and recorded in to history. In metal working and making, casting is a process in which a liquid metal is delivered into a mold that contains a negative impression of the intended shape. The metal is poured into the mold through a hollow channel called a sprue. The metal and mold are then cooled, and the metal part is extracted. Casting is most often used for making complex shapes that would be difficult or uneconomical to make by other methods. Casting processes have been known for thousands of years, and have been widely used for tools. Highly engineered castings are found in 90 percent of durable goods, including cars, trucks, aerospace, trains, mining and construction equipment, oil wells, appliances, pipes, hydrants, wind turbines, nuclear plants, medical devices, defense products, toys, and more. The modern casting process is subdivided into two main categories: expendable and non-expendable casting. It is further broken down by the mold material, such as sand or metal, and pouring method, such as gravity, vacuum, or low pressure.