Graphite mold for casting Best For You

With the development of the mold industry in recent years, graphite materials have been widely used in the mold industry. The new technology of graphite molds continues to impact the mold market. Graphite has gradually become the material of choice for mold making with its good physical and chemical properties.


Graphite mold processing performance:

  •   1. Excellent thermal and electrical conductivity
  • 2. Very good thermal stability and thermal shock resistance, such as low linear expansion coefficient
  • 3. Resistant to chemical corrosion and not easy to react with most metals
  • 4. Under high temperature (most copper-based matrix sintering temperature is above 800 ℃), the strength increases with the increase of temperature
  • 5. It has good lubrication and abrasion resistance.
  • 6. It is easy to process and has good machining performance. It can be made into molds with complex shapes and high precision.
  • Graphite mold application industry
  •   Graphite molds 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 the molten metal state are being promoted at home and abroad. Domestically, this method has been adopted in copper, copper alloy, aluminum, and aluminum alloy. Artificial graphite is considered to be the most suitable material as a mold for continuous casting or semi-continuous casting of non-ferrous metals. Production practice has proved that due to the graphite mold, the thermal conductivity is good (the thermal conductivity determines the solidification speed of the metal or alloy), the self-lubricating performance of the mold and other factors not only increase the casting 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 yield rate and reduces the loss of waste products, but also greatly improves the product quality. There are two types of continuous casting methods: vertical continuous casting and horizontal continuous casting.


Mould for pressure casting


Artificial graphite material has been successfully used in pressure casting of non-ferrous 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 so on.


Graphite molds for centrifugal casting


Graphite molds have been successfully applied to centrifugal casting. The United States has used artificial graphite molds with a wall thickness of more than 25 mm to centrifugally cast bronze bushings. In order to prevent the burning of the artificial graphite mold, certain anti-oxidation measures can be taken. After casting a certain number of castings, if the inner surface of the mold is found to be burnt, the size of the inner hole of the mold can be enlarged to be used for casting large-size casing.


hot press mold

The artificial graphite hot pressing mold used for 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 pressing pressure). The second is that pressing and heating are carried out in the same process, and a dense sintered body can be obtained after a short time of sintering.


Mold for glass molding

Graphite materials are chemically stable, not easy to be infiltrated by molten glass, and will not change the composition of the glass. Graphite materials have good thermal shock resistance and small size changes with temperature. In recent years, they have become indispensable molds in glass manufacturing. Material, it can be used to make molds for glass tubes, elbows, funnels and various other special-shaped glass bottles.


sintering mold and other diamond sintering molds


Using the characteristics of extremely small thermal deformation of artificial graphite materials, sintered molds and brackets for transistors can be manufactured. It is now widely used and has become an indispensable material for the development of the semiconductor industry. In addition, graphite molds are also used in casting molds for cast iron, durable molds for various non-ferrous metals, casting molds for cast steel, casting molds for heat-resistant metals (titanium, zirconium, molybdenum, etc.), and aluminum for welding rails. Hot welding molds, etc. Graphite molds for hot-pressed sintered diamond tools play the dual role of heating element and mold support during the manufacturing process of diamond tools. The quality of graphite molds directly affects the dimensional accuracy, appearance and shape of diamond tools. Hot-pressing sintering process requirements: temperature reaches (1000±2)℃, molding pressure is 16-50MPa, heat preservation time is 15-30min, and the environment is non-vacuum. Under these working conditions, the graphite molds for forming and heating elements are required to have conductivity, high resistivity, and sufficient mechanical strength, but also need to have good oxidation resistance and long service life to ensure diamond The dimensional accuracy and excellent performance of the tool. At present, the graphite mold materials used in the manufacture of diamond tools in western developed countries are mainly graphite materials with ultrafine particle structure, high purity and high graphitization degree. The average particle size is required to be less than 15μm, or even less than 10μm, and the medium pore size is less than 2μm. Graphite molds made of this carbon raw material have small porosity, compact structure, high surface finish, strong oxidation resistance, and an average service life of 30-40 times. Diamond molds require high material hardness, good oxidation resistance, and high processing accuracy. The use of high-quality graphite raw materials greatly extends the service life of the mold and improves the oxidation resistance.


 Electric Discharge (EDM) Machining


Moulds have increasingly become the main process equipment for industrialized mass production in the industrial fields of home appliances, automobiles, electromechanical, aerospace, etc., and undertake the processing and production of 60%-90% of product parts in these industries. In recent years, high-speed milling has broken through the limitations of traditional milling that are difficult to process high-hardness, high-strength, and high-toughness mold materials. However, EDM has high machining accuracy and surface quality, and a wide range of machining. Especially in the machining of complex, precise, thin-walled, narrow-slit, and high-hard materials, the advantages of high-speed milling are incomparable. Therefore, Electrical discharge machining will still be the main method of mold cavity processing. As graphite electrodes (compared with copper) have the advantages of low electrode consumption, fast electrical discharge machining speed, good machining performance, light weight, and low thermal expansion coefficient, they have gradually replaced copper electrodes and become the mainstream of electrical machining electrodes. Compared with copper, graphite electrodes have the advantages of less consumption, fast discharge speed, light weight and low thermal expansion coefficient, so they gradually replace copper electrodes and become the mainstream of electrical discharge machining electrodes.

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