Method and device for vacuum magnetron arc remelting and refining metal
A technology of vacuum arc remelting and arc remelting, which is applied in the field of electromagnetic metallurgy secondary refining, can solve the problems of severe temperature rise of anode and cathode surfaces, influence of metallurgical quality, loss of alloy composition, etc., so as to prevent metallurgical quality from being affected and delay ion shortage , Inhibit the effect of melting vaporization
Active Publication Date: 2017-12-22
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 severe melting and vaporization, serious loss of alloy composition and serious impact on metallurgical quality
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[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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The invention discloses a method and device for vacuum magnetron arc remelting and refining metal. A magnetic field generator is applied at the end of the vacuum arc remelting electrode and the periphery of the metal molten pool to provide an axial magnetic field. The magnetic field generator consists of two sets of same The core coil is composed of DC current and AC current respectively, and the stable magnetic field component generated by the DC current inhibits the charged particles moving in the radial direction, delays the phenomenon of ion poverty between the electrodes and the generation of anode spots, and reduces the arc voltage and Arc energy, to prevent the formation of concentrated arc for remelting, resulting in excessive local temperature of the electrode and severe melting and vaporization, which will affect the metallurgical quality. At the same time, the alternating magnetic field component generated by the alternating current can form a certain pressure gradient in the molten metal pool, and generate pressure waves to break dendrites. In addition, there will always be a certain angle between the alternating magnetic field and the DC arc current, so a certain oscillating Lorentz force will be formed, which will help break dendrites, refine solidified structures, and reduce ingot segregation.
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...
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IPC IPC(8): C22B9/20C22B9/21
Inventor 钟云波方贻鹏周俊峰王怀
Owner SHANGHAI UNIV