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Four main criteria for selecting graphite electrode materials
Views: 178 Update date: May 08,2021

There are many basis for selecting graphite electrode materials, but there are four main criteria:

 

1. The average particle diameter of the material
The average particle diameter of the material directly affects the discharge status of the material. The smaller the average particle size of the material, the more uniform the discharge of the material, the more stable the discharge, and the better the surface quality. For forging and die-casting molds with low surface and precision requirements, it is usually recommended to use coarser particles, such as ISEM-3, etc.; for electronic molds with high surface and precision requirements, it is recommended to use materials with an average particle size below 4μm.

 

2. Flexural strength of the material
The flexural strength of a material is a direct manifestation of the strength of the material, showing the tightness of the internal structure of the material. High-strength materials have relatively good discharge resistance performance. For electrodes with high precision requirements, try to choose better-strength materials.

 

3. Shore hardness of the material
In the subconscious understanding of graphite, graphite is generally considered to be a relatively soft material. However, actual test data and application conditions show that the hardness of graphite is higher than that of metal materials. In the specialty graphite industry, the universal hardness test standard is the Shore hardness measurement method, and its testing principle is different from that of metals. Due to the layered structure of graphite, it has excellent cutting performance during the cutting process. The cutting force is only about 1/3 of that of copper materials, and the surface after machining is easy to handle. However, due to its higher hardness, the tool wear during cutting will be slightly greater than that of metal cutting tools. At the same time, materials with high hardness have better control of discharge loss.

 

4. The intrinsic resistivity of the material
According to statistics on the characteristics of materials, if the average particles of the materials are the same, the discharge speed with a higher resistivity will be slower than a lower resistivity. For materials with the same average particle size, materials with low resistivity will have a correspondingly lower strength and hardness than materials with high resistivity. That is, the discharge speed and loss will vary. Therefore, it is very important to select materials according to actual application needs. Due to the particularity of powder metallurgy, each parameter of each batch of material has a certain fluctuation range of its representative value. However, the discharge effects of graphite materials of the same grade are very similar, and the difference in application effects due to various parameters is very small. The choice of electrode material is directly related to the effect of the discharge. To a large extent, whether the selection of the material is appropriate determines the final situation of the discharge speed, machining accuracy and surface roughness.




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