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Dual-mode plasma arc device and method for rotating electrode atomization

A plasma arc and rotating electrode technology, applied in the powder metallurgy industry, can solve problems such as low thermal efficiency, and achieve the effects of improving thermal efficiency, improving production efficiency, and improving compatibility

Active Publication Date: 2017-11-14
SINO EURO MATERIALS TECH OF XIAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of melting form, non-transferred arc can be applied to more materials, but its thermal efficiency is usually lower than that of transferred arc

Method used

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  • Dual-mode plasma arc device and method for rotating electrode atomization

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for centrifugal atomization of a dual-mode plasma arc device according to claim 1, the working mode of the plasma gun includes two modes of transferred arc and non-transferred arc, and the variable resistance module, the switch module, and the The gas pressure of the plasma gun controlled by the compressor is changed, and for the non-transferred arc working mode, the following steps are included:

[0037] Step 1, install the electrode rod, disconnect all devices from the power supply, and keep the gas pressure in the atomization chamber at 1.1 bar after the gas in the atomization chamber is replaced by Ar gas;

[0038] Step 2, start the compressor to keep the gun inlet pressure at 2.5bar, set the variable resistor connected to the nozzle to be small, start the high-frequency oscillator and power supply, start the arc between the nozzle and the cathode, and the plasma flame gas passes through the Laval type The plasma gun nozzle is compressed and blown out;

[...

Embodiment 2

[0042] A method for centrifugal atomization of a dual-mode plasma arc device according to claim 1, comprising the following steps:

[0043] Step 1, install the electrode rod, disconnect all devices from the power supply, and keep the gas pressure in the atomization chamber at 1.3bar after the gas in the atomization chamber is replaced by Ar gas;

[0044] Step 2, start the compressor to keep the gun inlet pressure at 3bar, set the variable resistance connected to the nozzle to be small, start the high-frequency oscillator and power supply, start the arc between the nozzle and the cathode, and the plasma flame gas passes through the Laval type plasma The nozzle of the gun is compressed and blown out;

[0045] In step 3, the plasma gun is moved as a whole, so that the non-transferred arc impacts the end face of the bar, and the end face of the bar begins to melt under the thermal impact of the plasma flame.

[0046] When the non-transferred arc mode is selected, it is suitable f...

Embodiment 3

[0048] A method for centrifugal atomization of a dual-mode plasma arc device according to claim 1, comprising the following steps:

[0049] Step 1, install the electrode rod, disconnect all devices from the power supply, and keep the gas pressure in the atomization chamber at 1.2 bar after the gas in the atomization chamber is replaced with Ar gas;

[0050] Step 2, start the compressor to keep the gun pressure at 2.8bar, set the variable resistance connected to the nozzle to be small, start the high-frequency oscillator and power supply, start the arc between the nozzle and the cathode, and the plasma flame gas passes through the Laval type The plasma gun nozzle is compressed and blown out;

[0051] Step 3, the plasma gun is moved as a whole, so that the non-transferred arc impacts the end face of the bar, and the end face of the bar begins to melt under the impact of the thermal energy of the plasma flame.

[0052] When the non-transferred arc mode is selected, it is suitable ...

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Abstract

The invention provides a dual-mode plasma arc device for rotating electrode atomization. The dual-mode plasma arc device comprises a high-frequency oscillator connected with a power supply, and the high-frequency oscillator is further connected with a truncated-cone-shaped cathode; a Laval type plasma gun nozzle is arranged outside the truncated-cone-shaped cathode, and the Laval type plasma gun nozzle is connected with a gas compressor and the power supply separately; and the power supply is further connected with a second electric brush and a first electric brush, the second electric brush and the first electric brush are located on the upper side and the lower side of the left end of an electrode bar, and the electrode bar is opposite to the left end of the truncated-cone-shaped cathode. A method for centrifugal atomization comprises the steps that (1), the electrode bar is installed, the power supply is switched off, and gas in an atomizing chamber is replaced with Ar gas; (2), the gas compressor is started, a variable resistor connected with the nozzle is set to be small, the high-frequency oscillator and the power supply are started, arcing is conducted between the nozzle and the cathode, and plasma flame gas is blown out after being compressed through the plasma gun nozzle; and (3), a plasma gun is integrally moved, and the end face of a bar materials starts to be melted under the thermal energy impact of a plasma flame. The dual-mode plasma arc device and method for rotating electrode atomization have the advantages that the structure is simple, the production efficiency is high, and the method is easy to operate.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy industry, and in particular relates to a dual-mode plasma arc device and a method thereof for rotating electrode atomization. Background technique [0002] The plasma rotating electrode method is a centrifugal atomization technology that uses high plasma heat as a heating source. The metal spherical powder produced by it has good customizability in particle size, good finish, high sphericity, high flow, and extremely low defects such as pores. , Oxygen and other impurities content increase very little, very suitable for hot isostatic pressing, additive manufacturing, metal injection molding and other powder molding technologies that have strict requirements on defects, fluidity, impurity content, and particle size. The heat source of the plasma rotating electrode method is usually a transfer plasma arc, which has a higher heat energy utilization rate than a non-transfer arc, and more com...

Claims

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Application Information

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IPC IPC(8): B22F9/14
CPCB22F9/14B22F2202/13
Inventor 刘洋韩志宇王庆相梁书锦张平祥
Owner SINO EURO MATERIALS TECH OF XIAN CO LTD
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