A method for electroslag remelting to prepare hollow steel ingots for large generator retaining rings

Abstract

A method of electroslag remelting to prepare hollow steel ingots for large generator protective rings, which is carried out according to the following steps: (1) prepare a consumable electrode group; (2) melt the slag material into liquid slag; (3) convert the self-consumable electrode group into liquid slag; The consumable electrode group is inserted into the electroslag remelting hollow ingot crystallizer; (4) Turn on the two transformers; (5) Liquid slag is injected into the electroslag remelting hollow ingot crystallizer; (6) The consumable electrode group contacts When the liquid slag reaches the liquid slag, a power loop is formed between the dummy electrode, the consumable electrode group and the bottom water tank; (7) When the liquid slag contacts the upper section, a circuit is formed between the upper section, the bottom water tank and the transformer connected to it; (8) ) Adjust the output current and voltage of the two transformers; (9) When the metal melt comes into contact with the molten steel level detection device, start the spindle extraction device to extract the spindle; (10) Exchange the consumable electrode group; (11) The subsequent Insert the consumable electrode set into the liquid slag and repeat steps (8)-(10) until the ingot is completed.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for electroslag remelting to prepare a hollow steel ingot for a large generator retaining ring. Background technique [0002] The composition of my country's primary energy determines that coal-fired power plants occupy a dominant position. This is also the biggest challenge my country faces in controlling greenhouse gas emissions. Therefore, using less coal to generate more power and clean and efficient utilization of coal have become strategic issues related to the sustainable development of my country's national economy. , one of the most important ways is to develop large-capacity and high-parameter supercritical and ultra-supercritical generator sets to improve the thermal efficiency of the generator set; The ring-shaped forgings of the winding coils at both ends of the motor rotor are used to protect the coils at both ends of the drive motor rotor from...

AI Technical Summary

Problems solved by technology

[0004] Using the traditional method to prepare hollow steel ingots for retaining rings has complex procedures, low forging yield, and a large amount of material waste caused by the punching process; multiple heating and multiple process deformations are easy to change the internal structure of the steel ingot, and are prone to forging cracks. It is also difficult to remove, and reheating after repeated cooling seriously affects the quality of the product. It is difficult to process hollow steel ingots for super large retaining rings, and the accuracy of the product and the uniformity of the material cannot be guaranteed.

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