How Many Forms Of Graphite Electrode Processing Are There?
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How many forms of graphite electrode processing are there?
There are three main forms of graphite electrode processing: pressurized vibration method, CNC automatic forming method and mechanical processing method.
| ITEM | Regular power | High power | Ultra High Power | ||||
| UNIT | 3-24inch | 4-24inch | 14-24inch | 12-20inch | 22-28inch | ||
| φ75-600mm | φ100-300mm | φ350-600mm | φ300-500mm | φ550-700mm | |||
| Resistivity | Electrode | μΩ·m | 7.0-9.0 | 5.8-6.8 | 5.5-6.5 | 4.8-5.8 | 4.5-5.5 |
| Nipple | 4.0-4.5 | 4.0-5.0 | 3.5-4.0 | 3.0-4.0 | 2.5-3.5 | ||
| Bending stregth | Electrode | Mpa | 8.0-12.0 | 9.0-12.0 | 10.0-14 | 10.0-15.0 | 12.0-16.0 |
| Nipple | 19.0-22.0 | 16.0-20 | 20.0-23.0 | 20.0-24.0 | 22.0-25.0 | ||
| Elastic Modulus | Electrode | Gpa | 7.0-11.0 | 8.0-12.0 | 8.0-12.0 | 9.0-13.0 | 10.0-14.0 |
| Nipple | 12.0-14.0 | 12.0-15.0 | 14.0-16.0 | 15.0-18.0 | 16.0-19.0 | ||
| Bulk density | Electrode | g/cm3 | 1.60-1.65 | 1.68-1.70 | 1.68-1.72 | 1.70-1.75 | 1.70-1.75 |
| Nipple | 1.75-1.8 | 1.78-1.82 | 1.78-1.82 | 1.78-1.85 | 1.8-1.85 | ||
| Ash | Electrode | % | 0.3 | 0.3 | 0.3 | 0.2 | 0.2 |
| Nipple | |||||||
| Electrode | 10-6/ºC | 2.0-2.4 | 1.6-2.0 | 1.6-1.9 | 1.1-1.4 | 1.1-1.4 | |
| CTE | Nipple | 100-600ºC | 1.8-2.2 | 1.1-1.5 | 1.1-1.4 | 0.9-1.2 | 0.9-1.2 |
(1) Pressurized vibration method: The pressurized vibration method requires a special machine tool, and the electrode master mold is opposite to the electrode shape. The graphite material and the forming tool are placed opposite to each other during processing, leaving a certain gap. A processing fluid mixed with water and abrasive is injected into it. While passing through the processing fluid, the graphite and the forming tool undergo ultrasonic vibration. Under the impact of the abrasive, the graphite is slightly peeled off to form the required shape. The abrasive is SiC, B4C or diamond. The coarser the abrasive, the faster the processing speed. The machine tool uses sealed and water curtain type processing when working. It is suitable for EDM processing for mass production.
(2) CNC automatic forming method: CNC automatic forming method requires a special graphite electrode forming machine, which uses CNC method, has an automatic tool changing device, and can accommodate multiple tools. In order to improve the processing environment, the graphite electrode is surrounded by a water curtain to prevent graphite dust from scattering. In addition, wet processing can also be used, and water-soluble cutting fluid can be used to prevent tool wear and graphite dust from flying. The machine tool has a high-performance filtration device that can separate the cutting fluid and graphite chips, which can ensure long-term continuous processing. It is an ideal special equipment for graphite electrode processing and is suitable for mold electrode processing. However, its price is relatively high and is not widely used in China.
(3) Mechanical processing method: Mechanical processing method is the main method used by general mold production units in China.
Graphite materials can be processed by turning, milling, drilling and grinding. In addition, graphite materials are prone to dust flying during mechanical processing, which has an adverse effect on processing equipment and operators.
