Method and device for remelting and refining metals by vacuum magnetic-control arc

A vacuum arc remelting and arc remelting technology, which is applied in the field of electromagnetic metallurgy secondary refining, can solve the problems of severe heating of anode and cathode surfaces, loss of alloy composition, influence of metallurgical quality, etc., so as to prevent metallurgical quality from being affected and inhibit melting and vaporization. , the effect of delaying ion starvation

Active Publication Date: 2015-12-09
SHANGHAI UNIV
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Problems solved by technology

The concentrated vacuum arc makes the surface of the anode and the cathode rise violently locally, resulting in

Method used

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  • Method and device for remelting and refining metals by vacuum magnetic-control arc
  • Method and device for remelting and refining metals by vacuum magnetic-control arc
  • Method and device for remelting and refining metals by vacuum magnetic-control arc

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Embodiment Construction

[0031] Preferred embodiments of the present invention are described in detail as follows:

[0032] In this example, see Figure 1 to Figure 5 , a vacuum arc remelting device, comprising an electrode feeding mechanism 1, a vacuum cover 2, an air extraction hole 4, a water-cooled copper mold crystallizer 6, a crystallizer cooling water jacket device and a power supply 11, the power supply 11 adopts a voltage-regulated DC power supply, and the vacuum The cover 2 is used as the outer shell of the vacuum arc remelting device to form a vacuum chamber 3. The air extraction hole 4 is arranged on the vacuum cover 2. The vacuum chamber 3 is connected to the vacuum pump through the air extraction hole 4. During the metal remelting process, the vacuum chamber 3 is continuously evacuated. The metal electrode rod 5 to be remelted and refined is installed on the bottom fixed end of the electrode feeding mechanism 1 in the vacuum chamber 3 as a consumable electrode, and the metal electrode ro...

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Abstract

The invention discloses a method and a device for remelting and refining metals by a vacuum magnetic-control arc. According to the method and the device, a magnetic field generator is applied on the tail end of a vacuum arc remelting electrode and the periphery of a metal melting pool; the magnetic field generator is composed of two groups of concentric coils; a direct current and an alternating current are charged respectively; and a static magnetic field component generated by charging the direct current forms an inhibition effect on charged particles which radially move, thus delaying generations of an inter-electrode ion-lacking phenomenon and anode spots, reducing the voltage and the energy of the arc, and preventing that an agglomerated arc is formed to remelt so that the local temperature of the electrode is too high to generate serious fusion and vaporization to influence metallurgical quality; meanwhile, the alternating magnetic field component generated by charging the alternating current is capable of forming a certain pressure gradient in the metal melting pool, and generating pressure wave broken dendrites; in additional, a certain included angle always exists between the alternating magnetic field and the current of the direct-current arc, so that a certain oscillation Lorentz force is formed, thus contributing to break dendrites, refine solidification structures and reduce cast ingot segregations.

Description

technical field [0001] The invention relates to an out-of-furnace refining method and device, in particular to a method and device for secondary refining of electromagnetic metallurgy, which are applied in the technical fields of electromagnetic metallurgical preparation of metal materials and quality control of metal materials. Background technique [0002] The traditional vacuum arc remelting process is to quickly melt the metal electrode rod prepared by the common smelting method through the high temperature of the DC arc under the condition of slag-free vacuum and then re-solidify it in the water-cooled copper mold crystallizer. When the liquid metal forms a droplet in the form of a thin layer and passes through the arc region of nearly 5000K to the crystallizer and solidifies, a series of physical and chemical reactions occur. The melting under vacuum and slag-free conditions eliminates external air and slag, etc. The pollution of steel and alloy can also reduce the gas...

Claims

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Application Information

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IPC IPC(8): C22B9/20C22B9/21
Inventor 钟云波方贻鹏王怀
Owner SHANGHAI UNIV
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