Graphite electrode is a kind of high temperature resistant conductive material used in electric steelmaking. So let DanCarbon talk about what is graphite electrode used for? The principle of graphite electrode and its application and properties.
1. What is graphite electrode used for?
As the name suggests, the graphite electrode is a kind of electrode used as the input or export current two ends of conductive medium, and this conductive medium is made of graphite material, in the process of steelmaking in the electric furnace, need to convert electrical energy into heat energy molten steel; Previously, copper electrodes were used as conductive materials. With the development of technology, graphite electrodes gradually replaced copper electrodes. A graphite electrode inserted into an electric furnace needs to be highly resistant to high temperatures, and the graphite electrode is 3~4 times more resistant to high temperatures than the copper electrode. The application process of graphite electrode is shown in the figure below:
The graphite electrode melts into the furnace as the temperature rises, so it is also expendable.
2. The principle of graphite electrode
The working principle of graphite electrode is to initiate an arc between the electric extreme and the steel in the furnace, thus producing a high temperature as a heat source to make steel by melting the charge. It can also be used for smelting a variety of other metal materials. The principle of graphite electrode is shown in the figure below:
Steelmaking eaf is now generally method, heat source is the electrical energy into heat energy, also known as electric arc furnace steelmaking, the principle of graphite electrode in electric furnace by arc discharge between the electrodes and the burden, electricity in arc converted into heat energy, and at the same time equipped with electric arc heating molten metal and slag, smelting of steel components. In addition, induction furnace, electroslag furnace and other steelmaking methods.
3. Usage and properties of graphite electrode
• Strong electrical and thermal conductivity;
• High thermal shock resistance and chemical stability;
• Lubricity and wear resistance;
• Easy to process, high metal removal rate and small graphite loss in EDM;
• the proportion of graphite is one fifth of copper, the same volume of graphite weight is five times lighter than copper. The large electrode made of copper is too heavy for EDM spindle precision for a long time. Graphite, on the other hand, does not, and it is very safe to carry.
• graphite can have a very high processing speed, general graphite processing speed than ordinary metal 3-5 times. Moreover, the choice of suitable hardness tool and graphite can reduce tool wear and electrode wear.
• Graphite is easy to form and will not deform. Some shapes of electrodes are not easy to make with copper but can be easily achieved with graphite. For example, flake electrode, copper is easy to be deformed in machining and EDM, while graphite can be easily reached, and graphite can be used in EDM with a large current and processing speed, there is no need to worry about deformation caused by excessive temperature and damage to the workpiece.