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Advantages of Graphite Electrodes

Feb. 07, 2020

1: The increasing complexity of mold geometries and the diversification of product applications have led to higher and higher requirements for the discharge accuracy of spark machines. The advantages of graphite electrodes are that they are easier to process, have a higher removal rate of electrical discharge machining, and have less graphite loss. Therefore, some group-based spark machine customers have abandoned copper electrodes and switched to graphite electrodes. In addition, some special-shaped electrodes cannot be made of copper, but graphite is easier to mold, and copper electrodes are heavier and are not suitable for processing large electrodes. These factors have caused some group-based spark machine customers to use graphite electrodes.


2: Graphite Electrode is easier to process, and the processing speed is significantly faster than copper electrodes. For example, milling graphite is used to process graphite, its processing speed is 2--3 times faster than other metal processing and no additional manual processing is required, and copper electrodes require manual grinding. Similarly, if a high-speed graphite machining center is used to manufacture the electrodes, the speed will be faster, the efficiency will be higher, and the problem of dust will not occur. In these processes, the selection of tools and graphite with the appropriate hardness can reduce the tool's wear and tear and copper breakage. If you compare the milling time of graphite electrodes with copper electrodes, graphite electrodes are 67% faster than copper electrodes. In general, the discharge processing using graphite electrodes is 58% faster than using copper electrodes. In this way, the processing time is greatly reduced, and the manufacturing cost is also reduced.

 Graphite Electrode

Graphite Electrode

3: The design of graphite electrodes is different from traditional copper electrodes. Many mold factories usually have different reserves for roughing and finishing of copper electrodes, while graphite electrodes use almost the same reserves, which reduces the number of CAD / CAM and machining operations. For this reason alone, It is enough to greatly improve the accuracy of the mold cavity.


Of course, after the mold factory switches from copper electrodes to Graphite Electrode For Mold, the first thing to know is how to use graphite materials and consider other related factors. Today, some group-based spark machine customers use graphite for electrode discharge machining, which eliminates the process of mold cavity polishing and chemical polishing, but still achieves the expected surface finish. Without increasing the time and polishing process, it would not be possible to produce such a workpiece with copper electrodes. In addition, graphite is divided into different grades. Under certain applications, appropriate grades of graphite and electrical discharge parameters can be used to achieve the ideal processing effect. If a spark machine using graphite electrodes uses the same parameters as copper electrodes, The results must be disappointing. If the material of the electrode is to be strictly controlled, the graphite electrode can be set to a non-loss state (loss is less than 1%) during the rough processing, but the copper electrode is not used.


Graphite has the following high-quality properties that copper cannot match:

Processing speed: High-speed milling roughing is 3 times faster than copper; high-speed milling finishing is 5 times faster than copper;

Good machinability, can realize complex geometric modeling;

Light weight, density is less than 1/4 of copper, electrode is easy to clamp;

Can reduce the number of single electrodes, because it can be bundled into a combined electrode;

Good thermal stability, no deformation and no burr.


The above is the superiority of graphite electrodes introduced by Graphite Electrode Supplier.


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