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How to identify the quality of graphite raw materials

Issuing time:2018-11-19 Popularity:583
Shandong Shuangyu Carbon Co., Ltd. mainly produces and sells graphite, graphite powder, flake graphite, expanded graphite, high-purity graphite, micro-powder graphite, spherical graphite, expanded graphite worm, graphite anode material. It is a professional graphite manufacturer in China. : 18669737779.
1. The flexural strength of the material
The flexural strength of the material is a direct manifestation of the strength of the material and represents the tight level of the external layout of the material. For materials with high strength, the discharge resistance is relatively good, and the electrode with high precision is required to select the material with better strength. For example: TTK-4 can satisfy the request of general electronic connector molds, but some electronic connector molds with special precision requirements can use TTK-5 material with the same particle size but slightly higher strength.


2. Shore hardness of the material
In the subconscious understanding of graphite, graphite is generally considered to be a softer material. However, the actual test data and the performance of the environment, the hardness of graphite is higher than the metal material. In the special graphite industry, the general hardness inspection scale is the Shore hardness measurement method, and the test principle is different from the metal test principle. Because of the layered layout of graphite, it has a very good cutting function in the cutting process, the cutting force is only about 1/3 of the copper material, and the machined profile is easy to handle.
However, due to its high hardness, the tool consumption during cutting is slightly larger than that of cutting metal. At the same time, the material having a high hardness has a good control ratio in terms of discharge consumption. In our EDM material system, there are two materials for the material with the same particle size. The hardness is slightly higher, and the hardness is slightly lower. need. Such as: uniform particle size of 5μm material, ISO-63 and TTK-50; uniform particle size of 4μm material, TTK-4 and TTK-5; uniform particle size of 2μm material, TTK-8 and TTK -9. It is important to consider the various types of customers to deal with the purpose of discharge and machining. The uniform particle diameter of the material directly affects the state of the material discharge. The smaller the uniform particle size of the material, the more average the discharge of the material, and the less disordered the state of discharge, the better the quality of the profile.
For casting, die casting molds with low profile and low precision requirements, all materials with coarser particles, such as ISEM-3, are used. For electronic molds with high profile and high precision requirements, the following materials with uniform particle size of 4μm are recommended. To ensure the accuracy of the processed mold, the outline brightness. The smaller the uniform particle size of the material, the smaller the consumption environment of the material, and the greater the influence between the ion clusters. For example, ISEM-7 is sufficient to satisfy the request for tight die-casting molds and casting molds. However, when customers have high requirements for precision, they use TTK-50 or ISO-63 materials to ensure smaller material consumption. The accuracy and profile of the packaged die are rough.
At the same time, the larger the particles, the faster the rate of discharge and the lower the consumption of roughing. The important thing is that the current intensity of the discharge process is divergent, causing the energy of the discharge to be different. However, the brightness of the profile after discharge has also changed with the change of particles.
4. The inherent resistivity of the material
According to the characteristics of our company's material handling, if the uniform particle size of the material is the same, the discharge rate with a large resistivity will be slower than the resistivity. For materials with the same uniform particle size, the material with low resistivity will also respond to the material with a higher resistivity than the material with high resistivity. That is, the rate and consumption of discharge will be different. Therefore, it is very tense to select the materials according to the actual use.
Because of the special nature of powder metallurgy, there are certain bumpy categories for the representative values of the materials for each batch of materials. However, the graphite material of the same grade has a very close discharge result, because the difference in the utilization results of various parameters is very small.
The choice of electrode material is directly related to the result of discharge. At a large level, the extraction of the material is appropriate, and the ultimate situation of discharge rate, processing accuracy and rough outline is determined. Grasping the above points, we have a great help in distinguishing the grade of graphite materials.

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