With the development of science and technology, graphite with its good physical and chemical properties has gradually become the preferred material for mold production; graphite mold is widely used in various fields.
1. Graphite mold for non-ferrous metal continuous casting and semi-continuous casting
In recent years, advanced production methods such as direct continuous (or semi-continuous) manufacturing of rods or pipes from molten metal are being promoted at home and abroad. Domestically, this method has been adopted in copper, copper alloy, aluminum, aluminum alloy, etc. Artificial graphite is considered to be a more suitable material as a mold for continuous casting or semi-continuous casting of non-ferrous metals. Production practice proves that as the use of graphite mold, due to its good thermal conductivity (the thermal conductivity determines the solidification speed of the metal or alloy), the mold's self-lubricating performance and other factors not only increase the mold speed, but also due to the size of the ingot accurate, smooth surface, uniform crystal structure, can be directly processed in the next process. This not only greatly improves the rate of finished products, reduces the loss of waste products, but also greatly improves the quality of products.
2. Mould 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 mould made of artificial graphite material have been used in automobile parts and so on.
3. Graphite mold for centrifugal casting
Graphite mold has been successfully used in centrifugal casting. The United States has adopted artificial graphite mold with wall thickness of more than 25 mm to centrifugal cast bronze sleeve. In order to prevent the burning loss of artificial graphite mold, some 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 burnt, the size of the inner hole of the mold can be enlarged to cast large-size casing.
4. Hot pressing die
The artificial graphite hot-pressing die used in the pressure sintering of cemented carbide has the following characteristics: 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 pressure); Second, pressurization and heating are performed in the same process, and a compact sintered body can be obtained after a short time of sintering.
5. Graphite mold for glass forming
Due to the chemical stability of graphite material, it is not easy to be infiltrated by molten glass, and the composition of glass will not be changed. Graphite material has good heat shock resistance and small size change with temperature. Therefore, it has become an indispensable mold material in glass manufacturing in recent years. It can be used to make mold of glass tube, elbow, funnel and other special-shaped glass bottles.
6. Sintered graphite mold and others
Taking advantage of the extremely small thermal deformation of artificial graphite materials, sintering molds and brackets for transistors can be manufactured, which are now widely used, and it has become an indispensable material for the development of the semiconductor industry. In addition, graphite molds are also used in molds for cast iron, durable molds for various non-ferrous metals, molds for cast steel, molds for heat-resistant metals (titanium, zirconium, molybdenum, etc.) and aluminium heat welding mold for welding rails, etc.
