Electro-slag remelting method of self-consumable electrode and electro-slag furnace

A consumable electrode, electroslag remelting technology, applied in the field of electroslag metallurgy, can solve the problems of low purity and density of magnesium alloy ingots, increase production time, reduce ingot purity and density, and save energy and raw materials. , solve the problem of current loss, improve the effect of purity and density

Active Publication Date: 2014-02-26
HUNAN LIFANG ROLLER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing electroslag remelting technology usually puts one casting into the electroslag furnace for electroslag remelting, and then puts the second one after the electroslag is finished, so that the electroslag remelting is carried out one by one, which not only wastes energy and raw materials, it also reduces the purity and density of the ingot, and the production efficiency is low; the existing electroslag furnace is usually designed according to the traditional operation process, without the functions of pause, speed regulation and current regulation
[0003] CN 102094125B disclosed a process for preparing magnesium alloys by electroslag remelting on January 09, 2013. The method is to use the smelted magnesium alloys to be prepared as consumable electrode rods, and put them into an electroslag furnace for electroslag remelting. For slag smelting, the working voltage is 25-40V, and the working current is 0.8-5kA. After electroslag smelting, it is rapidly solidified into magnesium alloy ingots through a water-cooled crystallizer; Electroslag remelting, the final magnesium alloy ingot has less purity and density, and increases production time, wasting energy and raw materials
[0004] CN 103173630A disclosed an electroslag remelting furnace on June 26, 2013, including a lifting platform and a platform lifting device for driving the lifting platform to move up and down. The lifting platform is provided with a motorized flat car, and the top of the motorized flat car is provided with a crystallizer. There are two uprights on the side of the platform lifting device, each upright is equipped with a cross arm, the free end of the cross arm is provided with a chuck for clamping electrodes, a three-phase transformer is installed between the two uprights, and the lead-out wire It is connected with various electrode clamps; however, the electroslag remelting furnace cannot adjust the remelting current at any time, and is not suitable for the electroslag remelting method of castings whose current is gradually lost during the melting process

Method used

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  • Electro-slag remelting method of self-consumable electrode and electro-slag furnace
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Experimental program
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Effect test

Embodiment 1

[0027] refer to figure 1 with figure 2 , an electroslag furnace used for electroslag remelting of consumable electrodes, including a furnace body 1, a consumable electrode 2 is arranged on the central upper side of the furnace body 1, and a slag pool 3, a metal melting pool 4 and bottom water tank 5; the side wall of the furnace body 1 is provided with a water-cooled crystallizer 6; the outside of the furnace body 1 is provided with an electrode lifting mechanism 7 connected to the consumable electrode 2 through a lifting arm 71, and the lower end of the lifting arm 71 is provided with The clamping mechanism 711 is a pair of clamping claws; the outer side of the furnace body 1 is provided with a main control cabinet 8, which includes a transformer 81, a controller 82 and a voltage regulator 83, and on the main control cabinet 8 There is a current regulation switch 84 and a pause switch 85, the current regulation switch 84 is used to adjust the size of the remelting current, ...

Embodiment 2

[0032] Electroslag furnace is as embodiment 1.

[0033] The electroslag remelting method of steel casting comprises the following steps:

[0034] 1) Three steel castings smelted in an electric arc furnace are welded in series to form a consumable electrode 2. The size of each steel casting is Φ200mm×280mm and the weight is 650 kg. After welding to form a consumable electrode 2, The head diameter and the tail diameter of the consumable electrode 2 are 140 mm, and the diameter of the middle part is 200 mm.

[0035] 2) Slowly lower the consumable electrode 2 and insert it into the slag of the electroslag furnace for secondary electroslag. After the arc is energized, adjust the remelting voltage to 57-61V and the remelting current to 6000-6500A, of which the slag The composition weight percentage is 70%CaF 2 +30%Al 2 o 3 ;

[0036] 3) The end of the consumable electrode 2 melts slowly, and the molten metal gathers into metal droplets, which fall off from the end of the consu...

Embodiment 3

[0042] Electroslag furnace is as embodiment 1.

[0043] The electroslag remelting method of iron casting comprises the following steps:

[0044] 1) Four iron castings smelted in an electric arc furnace are welded in series to form a consumable electrode 2. The size of each iron casting is Φ120mm×180mm and the weight is 300 kg. After welding to form a consumable electrode 2, The head diameter and the tail diameter of the consumable electrode 2 are 70 mm, and the diameter of the middle part is 120 mm.

[0045] 2) Slowly lower the consumable electrode 2 and insert it into the slag of the electroslag furnace for secondary electroslag. After the arc is energized, adjust the remelting voltage to 55-59V and the remelting current to 4000-4500A, of which the slag The composition weight percentage is 40%CaF 2 + 35%Al 2 o 3 + 25%CaO;

[0046] 3) The end of the consumable electrode 2 melts slowly, and the molten metal gathers into metal droplets, which fall off from the end of the c...

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Abstract

An electro-slag remelting method of a self-consumable electrode comprises the following steps: 1) welding a plurality of smelted castings in series into a whole, to form the self-consumable electrode; 2) slowly descending the self-consumable electrode and inserting into furnace slag of an electro-slag furnace, after energizing and arc striking, adjusting the remelting voltage and the remelting current; 3) slowly melting one end of the self-consumable electrode, gathering molten metal into metal molten droplets, falling off from the end of the self-consumable electrode, passing through a slag pool into a metal molten pool, and forming an ingot casting through forced cooling by a water-cooling crystallizer; 4) when melting the falling-off metal molten droplets, descending after pausing the non-molten self-consumable electrode for 10-20 s, and accelerating the descending speed by 10%-20%; and 5) after completion of electro-slag remelting, carrying out annealing treatment of the obtained ingot casting, and then carrying out mechanical processing to obtain the finished product. The invention also provides the electro-slag furnace for electro-slag remelting of the self-consumable electrode. Energy and raw materials are saved, the production efficiency is improved, the production time is shortened, and the high-purity ingot casting is obtained.

Description

technical field [0001] The invention relates to the technical field of electroslag metallurgy, in particular to an electroslag remelting method for consumable electrodes and an electroslag furnace. Background technique [0002] Electroslag remelting is a method of smelting using the resistance heat generated when the current passes through the slag as a heat source. Its main purpose is to purify metals and obtain ingots with clean and uniform structures. The existing electroslag remelting technology usually puts one casting into the electroslag furnace for electroslag remelting, and then puts the second one after the electroslag is finished, so that the electroslag remelting is carried out one by one, which not only wastes energy and raw materials, which also reduces the purity and density of the ingot, and the production efficiency is low; the existing electroslag furnace is usually designed according to the traditional operation process, without the functions of pause, spe...

Claims

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Application Information

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IPC IPC(8): C22B9/18C22B9/187
Inventor 彭龙生
Owner HUNAN LIFANG ROLLER
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