Perhaps you know what graphite is? Black, carbon-based, very brittle and easily broken, seems to be toxic and harmful to the human body?
In the 1960s, in the electrical processing industry, copper was widely used as an electrode material, with a usage rate of about 90% and graphite accounting for only about 10%. Today, this situation has changed a lot. In developed industrial countries, more than 90% of the electrode materials use graphite. But in China's electrical processing industry, more than 80% of users are still accustomed to using copper electrodes.
Concern 1: graphite is a dangerous material with potential health hazards;
Concern 2: When the graphite is processed, the electrode ribs are easily broken;
Concern three: has been accustomed to the use of copper electrodes, the need to understand the graphite materials and processes;
Concern 4: graphite electrodes are more expensive to use than copper electrodes;
Concern 5: The surface progress of graphite electrode processing is not as good as that of copper electrodes.
Is it true?
In order to allow more companies to share the market benefits brought by graphite electrode materials, on the afternoon of October 15, 2015, Swiss Archie Shamir will hold a seminar on graphite electric discharge machining process on the official website of Shenzhen Machinery Exhibition. At that time, Mr. Chen Yuming, the manager of the GF processing program (formerly known as GF AgieCharmilles Group in Switzerland), and Mr. Zhu Bin, the current application manager of the GFMS Group in South China, will bring online Chinese electric processing manufacturers. The most thorough and practical answer to questions.
About electroforming graphite electrodes
As a widely used industrial technology, EDM has always played an important role. In order to ensure the high quality of machining, the importance of electrodes is a topic that has been discussed for a long time. Today, as energy conservation and consumption reduction become hot topics, more and more customers have to start to realize some new trends in technological change: how to apply limited resources to increase production value, how to save time, cost and energy under the same conditions. .
The revolution in electrode materials has become the most effective way to solve the above problems. Graphite is an allotrope of carbon, with stable chemical properties, mobile ions in the nucleus, and strong electrical conductivity. Due to its special stable physical properties, it is gradually becoming the future trend of EDM electrode materials.
Conventional EDM mainly uses copper as an electrode. Although copper has good electrical conductivity, its energy efficiency is low and its price is high. Moreover, the copper electrode is heavy and is not suitable for processing large electrodes, and some special shaped electrodes cannot be made of copper. All kinds of drawbacks limit the development of enterprises and the application range of copper electrodes.
The diversification and refinement of the application of mechanical products has led to an increasing demand for discharge accuracy. The graphite electrode has a small loss during processing. Conventional copper electrodes have different reserves for roughing and finishing, while graphite electrodes use almost the same amount of reservation, which reduces the number of processing and greatly improves the processing accuracy of mechanical products.
Secondly, in the electrode processing process, the graphite electrode processing speed is significantly faster than the copper electrode. For example, the processing of graphite by milling process is 2 to 3 times faster than other metal processing and does not require additional manual processing, while the copper electrode requires manual grinding. Similarly, if a high-speed graphite machining center is used to make the electrode, the speed will be faster and the efficiency will be higher, and no dust problem will occur. If the milling time of the graphite electrode and the copper electrode graphite electrode is specifically compared, the graphite is 67% faster than the copper electrode. In the general case of electrical discharge machining, the processing using the graphite electrode is 58% faster than the copper electrode. As a result, the processing time is greatly reduced, and the manufacturing cost is also reduced.
These factors have accelerated the increasing use of graphite electrodes in the mold manufacturing industry.
Of course, after switching from a copper electrode to a graphite electrode, it should first be clear how to use the graphite material and consider other relevant factors. Graphite is divided into different grades. The appropriate grade of graphite and spark discharge parameters can be used in a specific application to achieve the desired processing results. If the operator uses the same parameters as the copper electrode on a spark machine using graphite electrodes, then the result It must be disappointing.
To sum up: Compared with traditional copper electrodes, graphite electrodes have great advantages in processing accuracy, release speed, energy consumption, thermal expansion coefficient or unit weight. Especially in the processing of precision, complex and high-hard materials, it has incomparable quality. After entering the 21st century, graphite as a new driving force for EDM technology will drive profound changes in the entire machinery industry and change our lives.
Concerned about surprises
Label: New Power for EDM Technology - Graphite
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