![]() ![]() Machining can also finish the surface of some alloys by grinding and buffing the metal until it shines. Rough surfaces also may increase the friction in moving parts or create uneven measurements and therefore be very undesirable. Therefore, machining is often done to create precise surface dimensions. Engineering specifications can be very precise to fulfil mechanical and structural needs, but casting does not provide dimensional accuracy to that level. Many metal castings need to fulfill precise dimensional tolerances to work as they will end up being parts of larger industrial machines. Machining Machining both finishes the surface and returns precise dimensions. This is a consumer-finished form of secondary processing, but similar treatments can be done by the foundry. Home chefs have the experience of completing this step when they bring home a cast iron pan home and “season” it with oil. Many iron and steel castings will rust if not sealed in some way and protecting against this oxidization is another almost universal finishing step. Sand castings generally have a rough finish, and often parts of the casting will be machined to be smoother, or the right size. On the other side, most castings are worked in their finishing stages. This “casting” stage in worked metal is limited and simplified, and is usually referred to as metal production, but it is technically a casting of the raw materials. Machine-worked metals often begin their journey as billets, slabs, or blooms from a continuous caster, or as pipes or wheels from a centrifugal one. These two branches of metal work may be separate, but metal items usually have both casting and working as part of their history. Castings are another branch, in which objects are made by pouring liquid metal into molds and allowing them to cool. One branch involves the cutting, forming, joining, or sealing metals in their solid state. There are different branches of metal work. Machining, assembling, and sealing the casting Machining, finishing, and assembly take a casting to a real-world application. ![]()
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