May. 14, 2020
Graphite Electrode mainly uses petroleum coke and needle coke as raw materials, coal pitch as binder, and is made by calcination, batching, kneading, pressing, roasting, graphitization, and machining. It releases electric energy in the form of electric arc in electric arc furnace The conductor that heats and melts the charge can be divided into ordinary power graphite electrode, high power graphite electrode and ultra-high power graphite electrode according to its quality index.
The Chinese Graphite Electrode Manufacturer tells us that there are three main forms of Industrial Graphite Electrode processing: pressure vibration method, CNC automatic forming method and mechanical processing method.
Pressurized vibration method: The pressurized vibration method requires a special machine tool, and the electrode master mold has the opposite shape to the electrode. Graphite materials and forming tools are relatively placed during processing, leaving a certain gap. The machining fluid, which is a mixture of water and abrasives, is injected into its solution. While passing through the machining fluid, the graphite and the forming tool are ultrasonically vibrated. Under the action of the abrasive impact force, graphite is stripped in small amounts to 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. It is suitable for EDM processing for mass production.
CNC automatic forming method: The CNC automatic forming method requires a special graphite electrode forming machine, which adopts a numerical control method and has an automatic tool exchange device, which can accommodate multiple tools. In order to improve the processing environment, the processing graphite electrode is surrounded by a water curtain to prevent the graphite dust from scattering around. In addition, the wet machining method can also be used to prevent the tool from being worn and the graphite dust from being scattered by the water-soluble cutting fluid. The machine tool has a high-performance filtering device, which can separate the cutting fluid and graphite chips, which can ensure continuous processing for a long time. However, its price is relatively high, and it is not widely used in China.
Mechanical processing method: The mechanical processing method is the main method adopted by domestic general mold production units.
Graphite materials can be processed by turning, milling, drilling and grinding methods. In addition, graphite materials are prone to fly ash during mechanical processing, which will adversely affect processing equipment and operators.
Processing procedures for graphite materials. Graphite immersed in oil. Before machining, the graphite material should be immersed in the engine oil for tens of hours to allow the oil to penetrate into the graphite material, so that the dust will not fly during the machining and a smoother surface can be obtained. Painted and crossed. After rough processing of the electrode surface, spray a thin layer of white paint on the scribing surface and then scribing, so that the lines are clear and easy to machine. Perform mechanical processing.
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