A foundry is a factory which produces various metal based castings from ferrous and non ferrous alloys. In a foundry, metals are melted so that they could form various parts. This can be achieved by placing the melted metals in molds to finally give their desired forms. It may require a certain level of expertise to work in a foundry. Normally, foundry workers wear special clothes and equipments so as to protect themselves from the hot environment of the factory.
Moreover, the most common metal alloys produced in a foundry are aluminium and cast iron. On the other hand, a wide variety of other metals are also produced. These include, copper, tin, magnesium and zinc among others. In a foundry, the melting process is performed in a furnace. The furnace is charged with different elements such as pure metal, internal and external scrap and other alloying compositions. The alloying elements can either be in the pure form or limited form. In other words, pure alloying elements such as electrolytic nickel or partial alloys like ferroalloys can be used in a foundry.
Therefore, the whole process consists of melting all the elements mentioned above and transferring in a transport recipient. The next step will be to refine the whole mixture to remove certain impurities. Other materials are added during the melting procedure so as to create the exact end product as per stipulations of industrial standards. Additionally, furnaces are one of the main equipments used in a foundry. The furnace is an important tool in a foundry where all the materials to be melted are placed. Certain modern furnaces used in a foundry these days can include electric arc furnaces, cupolas, crucible and reverbatory furnaces. However, one can see different furnaces in a foundry. This is because furnace choice may depend on the type of alloy to be produced. For ferrous materials, the electric arc furnace and the induction furnace among others can be used in a foundry. On the other end, reverbatory and crucible furnaces are suitable for producing aluminium castings.
Furthermore, furnaces have numerous designs. Designs can be calculated depending on specific factors. As such, furnaces may vary from one foundry to the other. You may see a small furnace in a specific foundry but come across one that can weigh tons in another. So, furnaces are built in regards with the types of materials that have to be melted. Also, furnaces may be designed with respect to the amount of fuel needed to produce the desired temperature. As a matter of fact, for low melting point alloys such as tin and zinc, a foundry has to be equipped with a furnace that can reach around 327 degree Celsius. In this case, the fuel used to attain this temperature can be propane, natural gas or electricity. But for high melting point alloys, such as steel and nickel, a foundry has to possess a furnace capable of reaching a temperature of around 3600 degree Celsius. Fuels such as electricity or coke may be used to attain this.
It can be vital to know that nowadays there may be foundries specialised for a specific metal production. For example an iron foundry will only produce iron based alloys while a steel foundry will also do the same by using their dedicated furnaces.
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