At present, the graphite mould is widely used in the following aspects:
Graphite mould for continuous casting and semi continuous casting of graphite mould
In recent years, the domestic and foreign is to promote the state of molten metal directly from the continuous (or semi continuous) production of rods or tubes, and other advanced production methods. Domestic copper, copper alloy, aluminum, aluminum alloy and other aspects have begun to use this method. Artificial graphite is considered as the most suitable material for continuous casting or semi continuous casting of nonferrous metals. Production practice has proved that due to the adoption of the graphite mold, because of its thermal conductivity is good (thermal conductivity determines the solidification rate of metal or alloy), mold self lubrication performance good and other factors, not only the casting speed improve and because of precise size of ingot, smooth surface, uniform crystal structure, directly under the procedures of processing. This not only greatly improve the rate of finished products, reduce the loss of waste products, but also the quality of products have greatly improved. Continuous casting method has two kinds: vertical continuous casting and horizontal continuous casting.
Mould for pressing and casting graphite mould
Artificial graphite materials have been successfully used in the pressure casting of nonferrous metals. For example, the use of artificial graphite materials for the production of pressure casting mold zinc alloy and copper alloy castings have been used in automotive parts, etc..
Graphite mould for centrifugal casting of graphite mould
Shi Momo has been successfully applied to centrifugal casting. The United States has a wall thickness of 25 mm above the artificial graphite mold centrifugal casting bronze sleeve. In order to prevent the loss of artificial graphite mold, can take certain measures to prevent oxidation. After casting a certain number of castings, if it is found that the mold has an inner surface burning, the mold hole size to large size casing casting.
Graphite mould hot pressing die
Artificial graphite hot pressing die for hard alloy pressurized sintering has the following characteristics: one is if pressed to raise the temperature to the 1350-1450 degree, the required pressure units can be dropped to 67-100 kilograms force / square cm (1 / 10 of cold pressure) can be; the second is pressurizing and heat in the same process. After a short time of sintering can get dense sintered bodies.
Mould for forming graphite mould
Due to the graphite materials with chemical stability, less susceptible to molten glass infiltration, does not change the glass composition, good resistance to thermal shock of graphite materials, size varies with temperature characteristics of small, so in recent years in the manufacture of glass become indispensable to the mold material, can use it to manufacture glass tube, pipe, funnel and other a variety of special-shaped glass bottle mold.
Graphite mould sintering mould and other diamond sintering mould
The sintering mould and the support of the transistor can be made by using the characteristic of the small thermal deformation of artificial graphite material, which is widely used now. It has become an indispensable material for the development of the semiconductor industry. In addition, graphite mould used for cast iron casting, non-ferrous metals in the durability of the mold, casting mold, refractory metal (Ti, Zr, Mo, etc.) with the cast and welded rail aluminothermic welding type mold. Hot pressing sintered diamond tools graphite mould, diamond tool manufacturing process in charged with the dual role of the heating element and a mould support, the pros and cons of the graphite mould quality, directly affects the diamond tool size precision, the appearance of the. Hot pressing sintering process requirements: the temperature reached (1000 + 2) degrees Celsius, molding pressure 16 ~ 50 MPa, heat preservation time is 15 ~ 30 min, the environment is not a vacuum state. In this condition, graphite mold and molding heating element with conductive, high resistivity, sufficient mechanical strength, also need to have good antioxidant performance and long service life, to ensure that the diamond tool size precision and excellent performance. At present, diamond tool in western developed countries manufacturing graphite mould material, mainly for ultrafine particle structure, high purity and high graphite degree of graphite material, the average particle size of less than 15 m, even 10 mu m or less, medium pore size less than 2 microns. With the carbon raw materials made of graphite mould, porosity, compact structure, high surface smoothness, oxidation resistance is strong, the average service life up to 30 ~ 40 times. Diamond die requires high hardness, good oxidation resistance, high processing precision, high quality graphite raw materials greatly extend the service life of the mold and improve the antioxidant properties.