Graphite mould

At present, graphite molds are widely used in the following aspects:

? Graphite mould for continuous casting and semi continuous casting of nonferrous metals

In recent years, advanced production methods such as directly continuous (or semi continuous) production of bars or tubes from the molten metal state are being promoted at home and abroad. This method has been used in copper, copper alloy, aluminum and aluminum alloy in China. Artificial graphite is considered as the most suitable material for continuous casting or semi continuous casting molds of non-ferrous metals. The production practice has proved that the graphite mold not only improves the casting speed due to its good thermal conductivity (which determines the solidification speed of metal or alloy) and good self-lubricating performance, but also can be directly processed in the next process due to its accurate size, smooth surface and uniform crystal structure. This not only greatly improves the yield and reduces the waste loss, but also greatly improves the product quality.

Continuous casting methods include vertical continuous casting method and horizontal continuous casting method.

? Mold for pressure casting

Artificial graphite has been successfully used in pressure casting of nonferrous metals. For example, zinc alloy and copper alloy castings produced by pressure casting molds made of artificial graphite materials have been used in automobile parts and the like.

? Graphite mould for centrifugal casting

Graphite mould has been successfully used in centrifugal casting. The United States has adopted artificial graphite mold with wall thickness of more than 25 mm to centrifugally cast bronze sleeve. In order to prevent the burning loss of the artificial graphite mold, certain anti-oxidation measures can be taken. After casting a certain number of castings, if it is found that the inner surface of the mold is burned, the size of the inner hole of the mold can be expanded to cast large-scale casing pipes.

? Hot pressing die

The artificial graphite hot pressing die has the following characteristics when it is used for pressure sintering of cemented carbide: first, if the pressing temperature is increased to 1350-1450 degrees, the required unit pressure can be reduced to 67-100 kgf / cm2 (that is, 1 / 10 of the cold pressing pressure); Second, the pressing and heating are carried out in the same process, and the compact sintered body can be obtained after a short time of sintering.

? Mold for glass molding

Due to its chemical stability, not easy to be infiltrated by molten glass, not changing the composition of glass, good heat-resistant impact performance, small size change with temperature and other characteristics, stone graphite material has become an indispensable mold material in glass manufacturing in recent years. It can be used to make glass tubes, bends, funnels and other molds of various special-shaped glass bottles.

? Sintering die and others

Artificial graphite can be used to manufacture sintering dies and supports for transistors due to its extremely small thermal deformation. It has been widely used and has become an indispensable material for the development of semiconductor industry. In addition, graphite molds are also used for cast iron molds, durability molds for various non-ferrous metals, cast steel molds, heat-resistant metals (titanium, zirconium, molybdenum, etc.), and thermite welding molds for rail welding.

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