Sand casting is a traditional casting process that uses sand as the main modeling material to make molds. Gravity casting is generally used for sand molds, and low-pressure casting, centrifugal casting and other processes can also be used when there are special requirements. Sand casting has a wide range of adaptability, small pieces, large pieces, simple pieces, complex pieces, single pieces and large quantities can be used. The molds used for sand casting were mostly made of wood in the past and are commonly called wooden molds. In order to change the defects of wood molds such as easy deformation and easy damage, Xudong Precision Casting Factory changed all molds to aluminum alloy molds or resin molds with high dimensional accuracy and long service life, except for the single-piece sand castings. Although the price has increased, it is still much cheaper than the mold for metal casting. In the production of small batches and large parts, the price advantage is particularly prominent.In addition, sand molds have higher refractoriness than metal molds, so materials with higher melting points such as copper alloys and ferrous metals also use this process. However, sand casting also has some shortcomings: because each sand mold can only be poured once, the mold is damaged after the casting is obtained and must be reshaped, so the production efficiency of sand casting is low; and because the overall nature of sand is soft However, it is porous, so the dimensional accuracy of sand outlaw castings ballarat lower, and the surface is rougher. However, the precision casting factory has accumulated many years of technology accumulation and has greatly improved the surface condition of sand castings, and the effect after shot blasting is comparable to that of metal castings.
Die casting is a metal mold pressure performed on a die casting machine, and it is currently the most efficient casting process. Die casting machines are divided into hot chamber die casting machines and cold chamber die casting machines. The hot chamber die casting machine has a high degree of automation, less material loss, and higher production efficiency than the cold chamber die casting machine. However, due to the heat resistance of the machine parts, it can only be used for the production of low melting point materials such as zinc alloys and magnesium alloys. . The aluminum alloy die castings that are widely used today can only be produced on cold chamber die casting machines due to their high melting point. The main feature of die casting is that the molten metal fills the cavity under high pressure and high speed, and forms and solidifies under high pressure. The disadvantage of die casting is: because the molten metal fills the cavity under high pressure and high speed, it is inevitable The air in the cavity is wrapped inside the casting to form subcutaneous pores, so aluminum alloy die castings are not suitable for heat treatment, and zinc alloy die castings are not suitable for surface spraying (but paint can be sprayed).Otherwise, when the pores inside the casting are heated for the above treatment, they will expand when exposed to heat and cause the casting to deform or bubble. In addition, the machining allowance of die castings should also be smaller, generally around 0.5mm, which can reduce the weight of the castings and reduce the amount of cutting to reduce costs, and it can also avoid penetrating the dense layer of the surface and exposing subcutaneous pores. The artifact is scrapped.
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