What are the advantages and disadvantages of sand casting and metal casting?
Sand casting - casting production method of casting in sand mold. Iron and steel, most nonferrous alloy casting sand casting method can be obtained. The other materials used cheap sand casting mould has the advantages of simple manufacture, easy to get, the single production of castings, mass production and mass production can adapt, for a long time, has been cast the basic process of production.Also known as die casting metal casting, it is the liquid metal is poured into the mold, to get the casting a casting method. The mold is made of metal, can be used repeatedly (hundreds to thousands of times). The metal casting can produce castings in weight and shape still exists as is the limit, simple shape castings of ferrous metal castings only; the weight should not be too big; there are limits on the wall thickness, the smaller section thickness not cast out.
Although there are many advantages of metal mold casting, there are also shortcomings:(1) the cost of manufacturing metal mould is high;(2) the metal type is airtight, and has no yielding, and is easy to be made into defects such as insufficient casting, cracking or iron casting, daytime and so on;(3) the metal mold casting, casting temperature, casting temperature and casting speed, casting in casting stay time, and the use of the coating, affecting the quality of castings is very sensitive to the need for strict control.Therefore, in determining the use of metal mold casting, it is necessary to consider the following factors: casting shape and weight must be appropriate; there should be sufficient quantities; completion of the production period of the permit
Advantages and disadvantagesThe comparison of metal to casting and sand casting: there are many advantages in technology and economy(1) the mechanical properties of the castings produced by metal mould are higher than those of sand casting. The tensile strength of the alloy can be increased by 25% on average, and the yield strength is increased by about 20%. The corrosion resistance and hardness of the alloy are also greatly improved;(2) the accuracy and surface finish of the casting are higher than that of the sand casting, and the quality and size are stable;(3) the casting process has a high yield, and the consumption of liquid metal is reduced. It can save 15 ~ 30%;(4) do not use less sand or sand, can save the other materials from 80 to 100%; in addition, metal mould casting and high production efficiency; reduce the cause of casting defects; the process is simple, easy to realize mechanization and automation.
