rp 800 graphite electrode
Analysis of the reasons for the kickback when using the rp 800 graphite electrode on the furnace
When the finished rp 800 graphite electrode is used in steel mills, occasionally there will be back-off, necking, oxidation, cracking, and block loss. For necking, oxidation, cracking, and block loss, it is generally considered to be the intrinsic of rp 800 graphite electrode. Quality problems, and for the kickback phenomenon, it is customary to think that it is the rp 800 graphite electrode processing problem, that is, the tolerance problem. Let’s briefly analyze the reasons for the kickback.
1. Improper tolerance matching
The fit between the body and the joint is a clearance fit, the hole diameter is a positive tolerance, and the outer diameter of the joint is a negative tolerance. Therefore, when pre-connection, the half length is added to control the reliability of the pre-connection. At the same time, otherwise half of the head is screwed into the pre-connected end, the remaining part and the lower end of the rp 800 graphite electrode have a larger gap, and a slight vibration will cause the product to snap back.
2. The resistance is too large. There are two reasons for the withdrawal phenomenon when the product with a fully qualified fit clearance is used:
(1) The contact resistance is too large, such as the defect of the tooth tip of the threaded buckle mentioned above, or the recessed busbar of the rp 800 graphite electrode hole, etc. As long as the threaded buckle is not fully contacted, the contact resistance will be increased and the withdrawal will be increased. risks of.
(2) If the electrical resistivity of the connector itself is too large, it will not only cause oxidation and consumption of the surface of the rp 800 graphite electrode, but also cause necking at the connecting part of the two rp 800 graphite electrodes. At the same time, the snapback phenomenon will also occur. For small or higher-grade connectors, this phenomenon will be reduced.
3. The phase sequence of the electric furnace is opposite to the direction of the tightening force of the rp 800 graphite electrode.
This problem generally occurs in new equipment. During the trial production, due to the phase sequence of the electrification, the molten steel in the furnace will produce eddy currents. The direction of the tightening force is opposite to that of the rp 800 graphite electrode, which will make the rp 800 graphite electrode and the joint looser and looser, resulting in an obvious back button. For experienced steel-making workers, it is easy to find such problems and adjust the phase sequence in time to avoid the continued occurrence of such problems. Datong rp 800 graphite electrode processing.