Plasma rotating electrode milling machine group and technique

Abstract

The invention relates to a plasma rotary electrode powder milling set and a process thereof, relating to the technical field of powder metallurgy. The milling set comprises a rotating feeding mechanism, a vacuum furnace, a vacuum unit, a plasma gun device and an electrical source. The rotating feeding mechanism is arranged at the exterior of one side of the vacuum furnace; the plasma gun device is arranged at the interior of the other side of the vacuum furnace; the vacuum unit is communicated with the vacuum furnace through a ventilation pipe, wherein, the vacuum furnace body has a double-decker sandwich structure, and cooling circulating water is injected into the sandwich structure; a receiving mechanism is arranged at the bottom part of the vacuum furnace, wherein, the receiving mechanism comprises two cut-off valves connected in series. The process includes the following steps: metal is processed into electrode bars; low-voltage heavy current is applied to the electrode bars to melt the electrode bars in a highly vacuumized melting chamber through the high temperature produced by the cathode arc of the plasma gun, and to eject the molten metal instantly by the strong centrifugal force produced through the high-speed rotation of the electrode bars to produce fine metal powders. The invention is characterized in that the yield of perfect spherical metal powders is up to 97 percent, and the powders are free from the contamination of any microelement.

Description

Technical field [0001] The present invention relates to the technical field of powder metallurgy, in particular to a production process and device for producing perfect spherical microbead powder, which is particularly capable of producing spherical powder of high melting point, refractory metals. Background technique [0002] At present, the well-known metal spherical powder is produced by gas atomization, water atomization, etc. The yield rate of the first two production methods to produce metal perfect spherical powder is about 10%-12%, and the spheres appear to be hollow. And it cannot be completely sorted. Generally, it will pollute the prepared materials slightly and change their chemical properties. [0003] According to the search, metal powder processing equipment designed for mass production of nanometal particles using plasma technology, the main structure is a plasma gun placed in the upper part of the shell lined with high temperature resistant materials, and a ...

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Problems solved by technology

It needs to melt the metal in advance, and the spherical shape of the prepared metal is not perfect

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