The Knowledge About Graphite electrode processing

Jun. 17, 2024

The Knowledge About Graphite electrode processing

In the use of graphite electrodes, the connection accuracy of the thread is very important. At present, graphite electrodes are commonly connected with conical joints, and the use of triangular threads (cone at the top) connection has the advantage of large contact area. Good thread processing can ensure the surface contact between the electrode hole thread and the joint thread, which not only makes the tooth surface uniformly stressed, avoids local stress concentration on the connection part, but also reduces the contact resistance, avoids the connection part overheating when the power is turned on, and greatly reduces the occurrence of accidents during usage. The accuracy of the thread chaser is one of the important factors that affect the contact of the thread connection, and the major carbon companies have also paid enough attention. However, due to the differences in the control of the inspection items of the thread chasers for each enterprise, the inspected parameters and inspection methods are also different. In this paper, the important parameters that affect the accuracy of the graphite electrode chaser and its detection methods have been studied, and a set of chaser quality inspection control and evaluation specifications have been formed. After years of practical verification, satisfactory results have been achieved.

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The chaser for graphite electrode processing

The chaser commonly used in the processing of graphite electrodes can be divided into two types according to the proportion of the hard alloy part of the chaser: full hard alloy chaser and inlaid hard alloy chaser:

1) The full hard alloy chaser, as the name suggests, is made of hard alloy. Its advantages are uniform material, strong structure, good processing and thermal stability, but its disadvantage is that the hard alloy is expensive.

2) The inlaid inlaid hard alloy chaser uses metal welding and riveting to connect the cemented carbide part for cutting and the ordinary steel part as the carrier. Its advantage lies in its low price, which is about 1/4 of the price of a full-hard chaser of the same specification. The disadvantage is that if the physical properties of different materials differ greatly, it will easily expand unevenly after being stressed, which will cause the chaser to bend and deform, which affects the processing accuracy. In severe cases, the chaser will break and damage the processing machine.

Graphite Electrodes and Finishing Applications

Despite the many advancements in machining technology, sinker EDM or electrical discharge machining still remains as a practical process for applications that involve difficult materials and complex geometries. Hundreds of thousands of powerful microscopic sparks that are generated by electrodes per second are used to remove materials from the work pieces.

In sinker EDM, the electrode material can be copper tungsten, pure copper, or graphite. Among these three, graphite electrodes are most popular and the most preferred. Aside from being accessible and easily machined into shapes needed for EDM use, graphite electrodes are also good for finishing applications. Certain grades of graphite are used to create extremely fine finish.

Two grades of graphite that are used for finishing are ultrafine and angstrofine. Ultrafine graphite have particle sizes of less than 5 microns and are suitable for most finishing applications. Angstrofine have particles that measure less than 1 micron and are used when extremely fine finish is needed.

Cleaning Permanent Magnets

Permanent lifting magnets have plenty of advantages over electromagnets. It requires no power to operate, very durable, reliable and affordable to purchase. Its real disadvantage is cleaning. Steel shavings that stuck to the permanent magnet can be quite annoying to remove.

Some recommend using an electromagnet with a stronger magnetic field to remove the shavings from the permanent magnet. The electromagnet is easier to clean since turning the power off stops its magnetism and the shavings will fall by themselves or can be removed just by using a brush.

Additional reading:
Maximize Efficiency with HP Graphite Electrodes

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The Knowledge About Graphite electrode processing