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Processing of graphite electrodes

Processing of graphite electrodes

(1) Pressurized vibration method: Pressurized vibration method requires special machine tools, and the electrode mother mold is opposite to the electrode shape. Graphite materials and forming tools are placed relative to each other during processing, leaving a certain gap. A machining fluid mixed with water and abrasive is injected into it. Ultrasonic vibration of graphite and forming tools occurs while passing through the processing fluid. Under the action of abrasive impact force, graphite is slightly peeled off to form the desired shape. The abrasive is SiC, B4C, or diamond. The coarser the abrasive, the faster the processing speed. When the machine tool is working, it adopts sealed type and water curtain type for processing. EDM machining suitable for mass production.

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Development history of graphite electrodes

Development history of graphite electrodes

It is reported that since the 1990s, the enterprise located in Beijing, led by Beijing Jixing Sheng'an Industry and Trade Co., Ltd., has been adhering to the development and production of graphite products. It has excellent CNC production equipment and processing centers, exquisite production technology, and complete testing methods. Since the early 1990s, due to its excellent performance and stable quality, the product has been consistently praised by users at home and abroad. Its "Ji'an" brand products include: graphite electrodes, graphite products for high-temperature treatment in industrial furnaces,

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National Standard for Graphite Electrodes

National Standard for Graphite Electrodes

This standard specifies the appearance, dimensions, allowable deviations, technical requirements, test methods, packaging, marking, storage, transportation, and quality certificates of graphite electrodes. This standard is applicable to ordinary power graphite electrodes made from high-quality petroleum coke, asphalt coke, and other main raw materials through molding, roasting, impregnation, graphitization, and mechanical processing. Power supply arc furnaces are used as conductive materials.

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Advantages of Graphite Electrodes (1)

Advantages of Graphite Electrodes (1)

The increasing complexity of mold geometry and the diversification of product applications have led to increasing requirements for the discharge accuracy of spark machines. The advantage of graphite electrodes is that they are easy to process, have a high removal rate by electrical discharge machining, and have low graphite loss. Therefore, some group based spark machine customers have abandoned copper electrodes and switched to graphite electrodes. In addition, some electrodes with special shapes cannot be made of copper, but graphite is easier to form, and copper electrodes are heavier, making them unsuitable for machining large electrodes. These factors have led to the application of graphite electrodes by some group based spark machine customers.

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Advantages of Graphite Electrodes (2)

Advantages of Graphite Electrodes (2)

Of course, after a mold factory switches from copper electrode to graphite electrode, it should first be clear how to use graphite materials and consider other relevant 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 desired surface finish. Without increasing the time and polishing process, it is impossible for copper electrodes to produce such a workpiece. In addition, graphite is divided into different grades, and using appropriate grades of graphite and spark discharge parameters for specific applications can achieve ideal machining results. If the operator uses the same parameters as copper electrodes on a spark machine using graphite electrodes, the results may be disappointing. If it is necessary to strictly control the material of the electrode, the graphite electrode can be set in a non loss state (loss less than 1%) during rough machining, but the copper electrode is not used.

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