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High speed processing of graphite electrode

Pulished on Jul. 24, 2019

The strategy of high speed machining of graphite electrode and the principle of optimum selection of processing parameters shared by China carbon graphite electrode.

Graphite has high temperature strength, low thermal expansion coefficient, good machinability and good thermal and electrical conductivity, so graphite electrode is widely used in metallurgy, furnace, edm and other fields. In terms of edm, the development of new graphite electrode material and its processing technology has extended the application range of edm and improved its performance.

Compared with copper electrode, graphite electrode has the advantages of low electrode consumption, fast processing speed, good mechanical processing performance, high machining accuracy, small thermal deformation, light weight, easy surface treatment, high temperature resistance, high processing temperature, electrode bonding and so on.

Although graphite is a kind of very easy cutting material, but as a result of used for EDM carbon graphite electrode for eaf materials must have sufficient strength to avoid damage in the process of operation and EDM machining, the electrode shape, thin wall and small rounded corners and sharp change) and also on the grain size and strength of graphite electrode put forward higher requirements, resulting in graphite in the process of machining workpiece easily broken, tool wear and tear. Therefore, how to prevent the workpiece from falling into pieces, improve the surface processing quality and reduce the cutting tool cost has become an important problem in graphite electrode processing.

Handan Graphite Electrode Factory

Generally, conventional turning, milling and grinding methods can meet the requirements of machining electrode with simple shape, but in recent years, the requirement of electrode geometry complexity continues to increase. The high surface quality and high precision of high speed machining make the high speed machining of graphite electrode become a hot spot in EDM machining of mould. For example, Makino SNC64 CNC high-speed graphite milling machine, R? :ders RFM series machine tools, etc., spindle speed is usually 10000 ~ 60000r/min, feed speed is more than 60m/min, machining wall thickness is less than 1mm, minimum rounded radius is less than 0.2mm.

As EDM graphite electrode high-speed processing is still a new process, the processing properties of different graphite materials are also different, for the workpiece breakage, tool wear, processing strategies and other issues in the high-speed processing of graphite electrode, domestic literature rarely mentioned. This paper introduces the research results of high performance graphite electrode materials machining in Japan and Germany, including the cutting mechanism of graphite electrode materials, cutting temperature, tool wear, chip treatment and other aspects of the basic theory, as well as the graphite electrode high-speed processing strategy, processing parameters selection and other content.