1: The increasingly complex geometry of the mold and the diversification of product applications lead to higher and higher requirements for the discharge accuracy of the spark machine. The advantage of graphite electrode is that it is easier to process, the removal rate of EDM is high, and the loss of graphite is small. Therefore, some group spark machine customers have given up 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 heavy, which is not suitable for processing large electrodes. These factors have led some group-based spark machine 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, graphite is processed by milling technology, which is 2 to 3 times faster than other metal processing and does not require additional manual processing, while copper electrodes require manual grinding. Likewise, if a high-speed graphite machining center is used to manufacture the electrodes, it is faster and more efficient without dusting problems. In these processes, choosing tools and graphite with appropriate hardness can reduce tool wear and copper damage. If you specifically compare the milling time of graphite and copper electrodes, graphite electrodes are 67% faster than copper electrodes. In general, graphite electrodes process 58% faster than copper electrodes in EDM. As a result, processing time is greatly reduced, which also reduces manufacturing costs.
Figure 3: Graphite electrodes are designed differently than conventional copper electrodes. Many mold factories usually leave different allowances for rough machining and finishing of copper electrodes, while graphite electrodes use almost the same allowance, thus reducing the number of CAD/CAM and machining. For this reason alone, it is enough to improve the accuracy of the mold cavity to a large extent.
Of course, after the mold factory changes from copper electrodes to graphite electrodes, it must first clarify how to use graphite materials and other related factors must also be considered. Today, some group-based EDM customers use graphite as the electrode for EDM, which saves the cavity polishing and chemical polishing processes, but still achieves the expected surface finish. It is impossible to manufacture such workpieces with copper electrodes without adding time and polishing steps. In addition, graphite is also divided into different grades. Only by using appropriate graphite grades and EDM parameters in specific applications can the ideal processing effect be achieved. If an operator uses the same parameters on a spark machine with graphite electrodes as copper electrodes, the results must be disappointing. For tight control of the electrode material, graphite electrodes can be set in a non-abrasive state (less than 1% loss) during roughing, but copper electrodes are not used.
Graphite has the following excellent properties that copper cannot match:
Processing speed: high-speed milling roughing is 3 times faster than copper; high-speed milling finishing is 5 times faster than copper
Good machinability, able to process complex geometries
Lightweight, the density is less than 1/4 of copper, the electrode is easy to clamp
Can reduce the number of individual electrodes as they can be bundled together to form combined electrodes
Good thermal stability, no deformation, no processing burrs.
Shanghai Weili Metal Products Co., Ltd. is located in Shanghai, the industrial metropolis of China. Founded in 2001, it is a well-known mold steel enterprise specializing in the supply of world-renowned brands. Professionally recommend and supply high-quality cold-work die steel for domestic mold manufacturing enterprises. , High-speed tool steel, hot work die-casting die steel, and plastic die steel. Over the years, the company has won the support and trust of customers all over the country with sincere and high-quality services.
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Description of related building materials entries:
graphite electrode
The national standard for general power graphite electrodes: Standard name Graphite electrode standard classification number Q51 Standard number YB/T 4088-2000 Application number YB/T 4088-2000 Alternative number YB/T 4088-1992 Implementation time 2000/12/1 0:00: 00 Release time 2000/7/26 0:00:00 Standard Access Page 7 International Standard Details This standard specifies the shape, size and allowable deviation, technical requirements, test methods, packaging, marking, storage, transportation, and quality certificates. This standard applies to high-quality petroleum coke, pitch coke, etc. as the main raw materials, which are made by forming, roasting, impregnating, graphitizing, machining, and other processes, and are used as ordinary power graphite electrodes for electric arc furnace conductive materials. National Standard for Graphite Electrode
processing
Definition 1. Refers to the reproduction of goods; consigned processing of goods refers to the business in which the entrusting party provides raw materials and main materials, and the entrusting party processes and manufactures according to the entrusting party's requirements and charges processing fees. Definition 2 refers to the process of developing from primary products to mature products. A series of chemical reactions that convert primary transcripts into functional messenger ribonucleic acid (mRNA), transfer ribonucleic acid (tRNA), or ribosomal ribonucleic acid (rRNA) molecules, including removal of introns, splicing of exons, 5' Capping and 3' tailing, etc.; a newly synthesized polypeptide chain is converted into a functional protein through a series of chemical modification reactions, including removal of N-formyl from methionine, phosphorylation, acetylation, hydroxylation, di Sulfur bond formation, etc. To sum up the above definitions, the processing is the process of transforming transformed substances according to certain organizational procedures or rules.