We all know that graphite has other metal materials can not replace the high quality characteristics, as the preferred material, graphite electrode material in the actual selection of materials often have a lot of confusing characteristics, the selection of graphite electrode material is also a lot of basis, but the main four standards:

For materials with the same average particle size, the strength and hardness of materials with low resistivity will be slightly lower than those with high resistivity. That is, the speed of discharge, loss will be different. Therefore, the natural resistivity of graphite electrode materials, in the practical application of the need to select materials is very important. The choice of electrode material is directly related to the discharge effect. To a large extent, whether the material is selected properly determines the discharge speed, machining accuracy and surface roughness.

　　In the special graphite industry, the general hardness test standard is the Shore hardness measurement method, the test principle is different from that of metal. Although we in the subconscious understanding of graphite, it is generally considered to be a relatively soft material. But the actual test data and application show that the hardness of graphite is higher than that of metal materials. Because of the layered structure of graphite, so that it has very superior cutting performance in the cutting process, cutting force is only about 1/3 of copper material, machined surface is easy to deal with.

But because of its higher hardness, in cutting, the loss of the tool will be slightly greater than the cutting tool of metal. At the same time, the material with high hardness has better control over discharge loss. Therefore, the Shore hardness of graphite electrode material is also one of the selection criteria of graphite electrode material.

Then there is the bending strength of graphite electrode material. The bending strength of graphite electrode material is a direct reflection of the strength of the material, showing the tightness of the internal structure of the material. High strength material, its discharge loss resistance is relatively good, for high precision requirements of the electrode, try to choose better strength material.

Finally, the average particle diameter of the graphite electrode material directly affects the discharge condition of the material. The smaller the average particle of the material, the more uniform the discharge of the material, the more stable the discharge condition, the better the surface quality. The larger the particle, the faster the discharge speed, the smaller the loss of rough machining. The main reason is that the discharge energy is different due to the different current intensity. However, the surface finish after discharge will also change with the change of particles.

Graphite electrode can become the preferred material in the industry, it is because of the graphite electrode has impeccable advantages, so the correct material selection standard of graphite electrode, suitable for the graphite electrode is the key.