Graphite electrodes is the mother of the steel industry, why ? 

Because in global market, most of steel plants are choosing electric arc furnace as a steel smelting way.

Graphite electrodes are mainly made of petroleum coke and needle coke as raw materials and coal tar pitch as binder. They are made by calcining, batching, kneading, pressing, roasting, graphitization and machining. They are released in the form of electric arcs in an electric arc furnace. The conductors that heat and melt the charge by electric energy can be divided into ordinary power, high power and ultra-high power according to their quality indicators.

Graphite electrodes include:

(1) Ordinary power graphite electrode. It is allowed to use graphite electrodes with a current density lower than 17A/cm2, which are mainly used in ordinary power electric furnaces such as steelmaking, siliconmaking, and yellow phosphorus smelting.

(2) Graphite electrode with anti-oxidation coating. The surface of the graphite electrode is coated with an anti-oxidation protective layer to form a protective layer that is both conductive and resistant to high temperature oxidation, reducing electrode consumption during steelmaking.

(3) High-power graphite electrodes. It is allowed to use graphite electrodes with a current density of 18-25A/cm2, mainly used in high-power electric arc furnaces for steelmaking.

(4) Ultra-high power graphite electrodes. Graphite electrodes with a current density greater than 25A/cm2 are allowed. Mainly used for ultra-high power steelmaking electric arc furnace.

1. Wet graphite electrodes should be dried before use.

2. Remove the foam plastic protective cap on the spare graphite electrode hole, and check whether the inner thread of the electrode hole is complete.

3. Clean the surface of the spare graphite electrode and the inner thread of the hole with compressed air free of oil and water; avoid cleaning with steel wire balls or metal brush abrasive cloth.

4. Carefully screw the connector into the electrode hole at one end of the spare graphite electrode (it is not recommended to directly install the connector into the electrode removed from the furnace), and do not collide with the thread.

5. Screw the electrode spreader (graphite material is recommended) into the electrode hole at the other end of the spare electrode.

6. When lifting the electrode, place a soft object under one end of the spare electrode mounting joint to prevent the ground from hitting the joint; use the hook to extend into the lifting ring of the spreader and then lift it up. Lift the electrode smoothly to prevent the electrode from loosening from the B end. come off or collide with other fixtures.

7. Lift the spare electrode above the electrode to be connected, align it with the electrode hole and drop it slowly; rotate the spare electrode to make the screw hook rotate and descend together with the electrode; when the distance between the end faces of the two electrodes is 10-20mm, use compressed air again Clean the two end faces of the electrode and the exposed parts of the connector; when the electrode is completely lowered, do not be too violent, otherwise the electrode hole and the thread of the connector will be damaged due to violent collision.

8. Use a torque wrench to screw the spare electrode until the end faces of the two electrodes are in close contact (the correct connection gap between the electrode and the connector is less than 0.05mm).

Graphite is very common in nature, and graphene is known to be the strongest substance, but it may still take scientists years or even decades to find a way to convert graphite into large sheets of high-quality graphene "thin films" methods, so that they can be used to manufacture various useful substances for human beings. According to scientists, in addition to being extremely strong, graphene also has a series of unique properties. Graphene is also the material known to have excellent electrical conductivity, which makes it also have great application potential in the field of microelectronics. Researchers even see graphene as a replacement for silicon that could be used to produce future supercomputers.

Note: Graphite electrodes for EDM, also known as copper males.

1. The increasing complexity of mold geometry and the diversification of product applications lead to higher and higher requirements for the discharge accuracy of spark machines. The advantages of graphite electrodes are that they are easier to process, have a high EDM removal rate, and have low graphite loss. Therefore, some Qunji 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 and not suitable for processing large electrodes. These factors cause some customers of Qunji spark machines to use graphite electrodes.

2. Graphite electrodes are easier to process, and the processing speed is significantly faster than copper electrodes. For example, the processing speed of graphite is 2~3 times faster than that of other metal processing and does not require additional manual processing, while copper electrodes require manual grinding. Similarly, if a high-speed graphite machining center is used to make electrodes, it will be faster and more efficient, and there will be no dust problems. In these machining processes, selecting tools and graphite with appropriate hardness can reduce tool wear and copper breakage. If the milling time of graphite electrode and copper electrode is compared in detail, graphite is 67% faster than copper electrode. In general EDM, the machining of graphite electrode is 58% faster than that of copper electrode. As a result, processing time is greatly reduced, and manufacturing costs are also reduced.

3. The design of graphite electrodes is different from traditional copper electrodes. Many mold shops usually have different allowances for roughing and finishing of copper electrodes, while graphite electrodes use almost the same allowance, which reduces the number of CAD/CAM and machining times. For this reason alone, it is necessary to It is enough to greatly improve the accuracy of the mold cavity.