The main forms of graphite electrode processing are the pressurized vibration method, CNC automatic forming method, and mechanical processing method.
1. Pressure vibration method: The pressure vibration method requires a special machine tool, and the shape of the electrode master mold is opposite to that of the electrode. The graphite material and the molding tool are placed opposite each other during processing, leaving a certain gap. A machining fluid mixed with water and abrasives is poured into it. The graphite and forming tool are ultrasonically vibrated when the machining fluid passes through. Under the impact of the abrasive, the graphite is slightly exfoliated and formed into the desired shape. The abrasive is SiC, B4C, or diamond, the coarser the abrasive is, the faster the processing speed will be. The machine adopts sealed and water curtain processing when it is working. EDM is suitable for high-volume production.
2. CNC automatic forming method: CNC automatic forming method requires a particular graphite electrode forming machine, adopts a numerical control method, has an automatic tool changer, and can accommodate a variety of tools. To improve the processing environment, graphite electrodes are surrounded by water curtains to prevent graphite dust from flying. In addition, wet machining can also be used to avoid tool wear and graphite dust from flying with water-soluble cutting fluid. The machine tool has a high-performance filter device, which can separate the cutting fluid from the graphite chips and can guarantee continuous processing for a long time. It is an ideal special equipment for graphite electrode processing, and it is suitable for mold electrode processing. However, its price is high, and its application in China is not widely used.
3. Machining method: This is the main method adopted by general mold production units in my country.
Graphite materials can be machined by turning, milling, drilling, and grinding. In addition, graphite materials are easy to raise dust during mechanical processing, which will have adverse effects on processing equipment and operators.