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.

 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.