Features Of Graphite Electrode

(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 advantage of graphite electrodes is that they are easier to process.EDMhigh removal rate,graphiteThe loss is small, therefore, some group base spark machine customers have abandoned copper electrodes and switched to graphite electrodes. In addition, some special-shaped electrodes cannot be made of copper, but graphite is easier to form, and copper electrodes are heavier and not suitable for processing large electrodes, all of which cause some customers to use graphite electrodes.

(2) Graphite electrodes are easier to process, and the processing speed is significantly faster than that of copper electrodes. For example, the milling process is used to process graphite, which is 2~3 times faster than other metal processing and does not require additional manual processing, while copper electrodes need manual grinding. Similarly, if the electrodes are manufactured on a high-speed graphite machining center, they will be faster and more efficient, and there will be no dust problems. In these processes, choosing the right hardness of the tool and graphite can reduce tool wear and tear and copper electrode breakage. If we compare the milling time of graphite electrode and copper electrode, graphite electrode is 67% faster than copper electrode, and in general EDM, the processing with graphite electrode is 58% faster than that with copper electrode. As a result, machining time is significantly reduced, while manufacturing costs are also reduced.

(3) The design of graphite electrodes is different from that of traditional copper electrodes. While many mold mills usually have different reservations for roughing and finishing of copper electrodes, graphite electrodes use almost the same amount of reservation, which reduces the number of CAD/CAM and machining operations, and for this reason alone, it is enough to greatly improve the accuracy of the mold cavity.

(1) Long production cycle. The production cycle of ordinary power graphite electrodes is about 45 days, the production cycle of ultra-high power graphite electrodes is more than 70 days, and the production cycle of graphite electrode joints that require multiple impregnation is longer.

(2) High energy consumption. The production of 1t ordinary power graphite electrode requires about 6000kW·h of electric energy, thousands of cubic meters of coal gas or natural gas, and about 1t of metallurgical coke particles and metallurgical coke powder.

(3) There are many production processes. The production process includes raw material calcination, crushing and grinding, batching, kneading, molding, roasting, impregnation, graphitization and machining. Its production requires a lot of special machinery and equipment and kilns with special structures, and the construction investment is large.Payback periodLonger.

(4) A certain amount of dust and harmful gases are generated in the production process, and perfect environmental protection measures for ventilation and dust reduction and elimination of harmful gases need to be taken.

(5) The carbonaceous raw materials required for production, such as petroleum coke and coal asphalt, are by-products of oil refining enterprises and coal chemical enterprises, and the quality and stability of raw materials are difficult to be fully guaranteed, especially needle coke and modified electrode asphalt and low for the production of high-power and ultra-high-power graphite electrodesQuinoline insolubleThe content of special impregnating agent asphalt urgently needs the attention and active cooperation of China's petroleum and coal chemical processing enterprises.