The difference between casting and smelting
two. The casting process can be divided into three basic parts, namely, casting metal preparation, casting preparation and casting processing. Casting metal refers to casting pouring casting metal material used in the production, it is a kind of metal elements as the main ingredient, and adding other metal or nonmetal elements and the composition of the alloy, traditionally known as the main cast alloy, cast iron, cast steel and cast nonferrous alloys. The advantages of the advantages and disadvantages of the casting process: 1, can produce complex shape parts, especially complex inner blank; 2, wide adaptability, can be used for casting metal materials industry, a few grams to hundreds of tons; 3, a wide source of raw materials, low price, such as scrap steel, scrap, scrap and other shapes; the size and parts of 4 castings are very close, to reduce the cutting amount, belonging to the non cutting processing; 5, widely used in agricultural machinery 70%~80% 40%~70%, machine weight are cast.
Casting is the process of melting metal into a liquid that meets a certain requirement and pouring it into a mold. After cooling, solidification and finishing, the casting is obtained with a predetermined shape, size and performance. Casting blank for almost forming, and achieve free machining or a small amount of processing to reduce the cost and reduce the production time to a certain extent. The main sand casting and special casting 2 categories, 1 ordinary sand casting, using sand as the mold material, also known as sand casting, foundry, including wet sand and dry sand and 3 kinds of chemical hardening sand, but not all are available in sand casting. Advantage is low cost, because of the use of the mold sand can be used repeatedly; the disadvantage is time-consuming mold manufacture, the mold itself cannot be reused to damage can be achieved after finished. 2, special casting, special casting press molding materials can be divided into natural mineral sand as the main materials (such as casting, mud casting, shell casting, vacuum casting, mold casting, ceramic mold casting, special casting and metal) as the main materials (such as cast metal casting pressure casting, continuous casting, low pressure casting, centrifugal casting, etc.)
Casting: molten liquid metal filled with cavity cooling. The middle part of the product is easy to generate air holes.Forging: forming mainly by extruding at high temperature. The grain in the workpiece can be refined.Performance difference.After forging, metal plastic deformation, a grain refinement in continuous fibers, so commonly used in key parts of Mao PI manufacturing, such as the axis, gear and so on.The casting has the requirement to be processed, and the casting properties of cast iron and aluminum are better. Do not have the advantages of casting forging, but it can make complicated shape of zero, so commonly used in mechanical performance requirements of supporting parts manufacturing Mao pi. For example, machine tools, housings, etc..
