Electrode induction ultrasonic hot gas atomization powdering device and powdering method

Abstract

The electrode induction ultrasonic hot gas atomization powder making device is characterized in that the electrode induction ultrasonic hot gas atomization powder making device comprises a material changing chamber, a smelting chamber and an atomizing chamber which are sequentially arranged from top to bottom, and a rotary lifting mechanism for driving a bar to ascend, descend and rotate is arranged in the material changing chamber; an induction coil for heating and melting a bar and an ultrasonic transducer for crushing molten liquid drops into small liquid drops are arranged in the smelting chamber, one side of the smelting chamber is connected with an inert gas inlet pipe, a gas heating device is arranged on the inert gas inlet pipe, and a nozzle for atomizing the molten liquid drops is arranged in the atomizing chamber. The ultrasonic transducer and the hot gas are introduced into the electrode induction technology, the powder making device is reasonable in structure, the powder making method is simple in process, the problems that an existing atomization mode is single, and the fine powder yield is low are effectively solved, the production efficiency and the fine powder yield are greatly improved, and the production cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of atomization powder making, and relates to an electrode induction ultrasonic hot gas atomization powder making device and a powder making method. Background Art

[0002] At present, the methods for preparing metal powder mainly include electrode induction gas atomization process, ultrasonic atomization powder making process, etc. Among them, the principle of electrode induction gas atomization (EIGA) is to use rod raw materials as electrodes, so that they are continuously melted in the high-frequency induction coil. Under the action of gravity, the metal liquid flows through the center hole of the atomizer, and the metal powder is obtained after the impact of high-speed airflow. The principle of ultrasonic atomization powder making is that the arc melts the metal wire into droplets, and the droplets fall directly on the atomization surface of the ultrasonic transducer. The ultrasonic transducer converts high-frequency sound waves into high-frequency mechanical energy, and the high-frequency vibration produces standing waves. When the molten metal liquid passes through the atomization surface, it is broken into a uniform micron-sized droplet mist to achieve atomization. The atomized micron-sized droplets are thrown out of the atomization surface under the action of the rotating centrifugal force and standing waves of the atomization surface, and are rapidly solidified when cooled by air to form micron-sized metal solid particles.

[0003] At present, the electrode induction gas atomization process has become the mainstream preparation method for spherical titanium alloy powder. In industrial production, this process uses room temperature gas as the crushing gas. The raw material bar is heated and melted into droplets through the electrode induction principle and drips into the atomization chamber. The room temperature inert gas crushes the droplets to form powder. However, the existing device has low gas superheat and a single atomization method, resulting in a fine powder yield of usually 40%-50%. There are defects such as low fine powder yield and low raw material utilization. The raw material for ultrasonic atomization powder making is metal wire, which has a high raw material cost and low production efficiency.

[0004] Therefore, it is necessary to develop a new aerosol powder making device and a powder making method to improve production efficiency and reduce production costs. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide an electrode-induced ultrasonic hot gas atomization powder-making device with reasonable structural design and high superheat, and to add an ultrasonic device to effectively improve the production efficiency and fine powder yield.

[0006] The second technical problem to be solved by the present invention is to provide an electrode-induced ultrasonic hot gas atomization powder making method with reasonable process and high production efficiency, which can effectively improve the fine powder yield and reduce the powder making cost.

[0007] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: an electrode induction ultrasonic hot gas atomization powder making device, characterized in that it includes a material changing chamber, a smelting chamber and an atomizing chamber arranged in sequence from top to bottom, a rotating lifting mechanism for driving the rod material to lift and rotate is provided in the material changing chamber, an induction coil for heating and melting the rod material and an ultrasonic transducer for breaking the molten droplets into small droplets are installed in the smelting chamber, an inert gas inlet pipe is connected to one side of the smelting chamber, a gas heating device is provided on the inert gas inlet pipe, and a nozzle for atomizing the molten droplets is provided in the atomizing chamber.

[0008] As an improvement, an openable and closable partition is provided between the material changing chamber and the smelting chamber, a bracket is vertically provided in the material changing chamber, a slider which can move up and down is provided on the bracket, the rotary lifting mechanism includes a lifting motor which can drive the slider to move up and down and a rotating motor which drives the rod to rotate, the lifting motor is fixed to the upper end of the bracket, the rotating motor is installed on the slider, and the upper end of the rod is connected to the rotating motor through a clamping device.

[0009] Furthermore, the induction coil is a multi-turn large-angle conical coil coaxially arranged with the rod.

[0010] Furthermore, the material changing chamber and the smelting chamber are pressure-resistant devices with a pressure resistance of not less than 3.0 MPa, and a pressure regulating valve is installed on the inert gas inlet pipe.

[0011] Furthermore, there are at least two ultrasonic transducers, which are symmetrically arranged on the outside of the induction coil.

[0012] Finally, the nozzle is a Laval nozzle.

[0013] The technical solution adopted by the present invention to solve the above second technical problem is: an electrode-induced ultrasonic hot gas atomization powder making method, characterized in that: the above electrode-induced ultrasonic hot gas atomization powder making device is used for preparation, and the specific steps are:

[0014] 1) Install the bar: lower the partition to separate the material changing chamber from the melting chamber, install the bar on the slider through the clamping device and connect it to the rotating motor;

[0015] 2) The material changing chamber is evacuated to a specified vacuum degree, the partition is raised, the material changing chamber is connected with the smelting chamber, and the titanium alloy bar enters the induction coil downward at a certain rotation speed and movement speed under the control of the rotating motor and the lifting motor;

[0016] 3) Adjust the valve of the pressure regulating valve to adjust the pressure in the smelting chamber to a suitable pressure, and the inert gas enters the smelting chamber after being heated by the gas heating device;

[0017] 4) Turn on the coil power supply to melt the bar;

[0018] 5) Turn on the ultrasonic transducer to ultrasonically break the melted droplets into small droplets;

[0019] 6) After ultrasonic crushing, the small droplets are carried into the Laval nozzle by high-pressure gas, atomized in the atomization chamber, and solidified to form spherical metal powder;

[0020] 7) After the melting of the bar material is completed, the material head returns upward to the material changing chamber under the control of the rotating lifting mechanism, the partition is closed, the new bar material is replaced, and the above process is repeated.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] The advantages of electrode induction atomization powder making technology and ultrasonic atomization powder making technology are combined. An ultrasonic transducer is added to the smelting chamber so that the melted droplets are broken into smaller droplets by the ultrasonic transducer. The conical angle of the conical coil is increased so that the droplets stay in the induction coil for more time to heat and obtain a higher superheat. At the same time, the time the droplets are within the action range of the ultrasonic transducer is extended, and the ultrasonic crushing time is extended. A gas heating device is provided to heat the inert gas entering the smelting chamber, increase the superheat of the droplets, and further refine the powder. The present invention introduces ultrasonic transducers and hot gas into the electrode induction technology. The powder making device has a reasonable structure and the powder making method has a simple process. It effectively solves the problems of the existing single atomization method and the low fine powder yield, greatly improving the production efficiency and fine powder yield, and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the electrode-induced ultrasonic hot gas atomization powder making device provided by the present invention;

[0024] Figure 2 It is a schematic diagram of the electrode-induced ultrasonic thermal gas atomization principle of the present invention. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the accompanying drawings.

[0026] like Figure 1 , 2As shown, an electrode induction ultrasonic hot gas atomization powder making device comprises a material changing chamber 1, a smelting chamber 2 and an atomizing chamber 3 arranged in sequence from top to bottom, wherein the material changing chamber 1 and the smelting chamber 2 are pressure-resistant devices with a pressure bearing pressure of 3.0 MPa. The material changing chamber 1 is mainly used to replenish the rod material 6 in the melting chamber 2; a rotating lifting mechanism for driving the rod material 6 to rise and fall and rotate is provided in the material changing chamber 1, an induction coil 4 for heating and melting the rod material 6 and an ultrasonic transducer 10 for breaking the molten droplets into small droplets are installed in the smelting chamber 2, an inert gas inlet pipe 12 is connected to one side of the smelting chamber 2, a gas heating device 8 is provided on the inert gas inlet pipe 12, and a nozzle 5 for atomizing the molten droplets is provided in the atomizing chamber 3.

[0027] The specific structure is as follows: an openable and closable partition 15 is provided between the material changing chamber 1 and the smelting chamber 2. The function of the partition 15 is to separate the material changing chamber 1 from the smelting chamber 2. When melting is carried out in the smelting chamber 2, the partition 15 rises, and the material changing chamber 1 is connected with the smelting chamber 2; when the rod material 6 needs to be supplemented, the partition 15 is lowered, the material changing chamber 1 is separated from the smelting chamber 2, the air release valve is opened, the material changing chamber 1 is filled with air, and then the material changing chamber door is opened, the rod material 6 is supplemented into the material changing chamber 1, and the vacuum is evacuated to a specified vacuum degree, and the partition 15 is opened, and the material changing chamber 1 is connected with the smelting chamber 2. A bracket 13 is vertically arranged in the material changing chamber 1, and a slider 14 that can move up and down is arranged on the bracket 13. The rotary lifting mechanism includes a lifting motor 9 that can drive the slider 14 to move up and down and a rotating motor 11 that drives the rod 6 to rotate. The lifting motor 9 is fixed to the upper end of the bracket 13, and is connected and drives the slider 14 to move up and down through a screw nut structure. The rotating motor 11 is installed on the slider 14, and the upper end of the rod 6 is connected to the rotating motor 11 through a clamping device. The induction coil 4 is a multi-turn large-angle conical coil coaxially arranged with the rod, and the conical angle and number of turns of the conical induction coil 4 are increased. At present, the number of turns is 4, and the taper is 30°, so that the droplets stay in the induction coil 4 for more time to heat and obtain a higher superheat. A pressure regulating valve 7 is installed on the inert gas inlet pipe 12. There are two ultrasonic transducers 10, which are symmetrically arranged on the outside of the induction coil 4. The nozzle 5 is a Laval nozzle. The Laval nozzle is a single-piece atomizing nozzle with a simple structure, which is mainly used to form suction at the bottom of the induction coil 4 and atomize the droplets.

[0028] An electrode-induced ultrasonic hot gas atomization powder making method is used to prepare the powder by using the electrode-induced ultrasonic hot gas atomization powder making device, and the specific steps are as follows:

[0029] 1) Installing the bar 6: lowering the partition 15, separating the material changing chamber 1 from the melting chamber 2, and installing the bar 6 on the slider through the clamping device and connecting it to the rotating motor 11;

[0030] 2) The material changing chamber 1 is evacuated to a specified vacuum degree, the partition 15 is raised, the material changing chamber 1 is connected with the smelting chamber 2, and the titanium alloy bar 6 moves downward into the induction coil 4 at a certain rotation speed and movement speed under the control of the rotating motor 11 and the lifting motor 9;

[0031] 3) The valve of the pressure regulating valve 7 is adjusted to adjust the pressure of the smelting chamber 2 to a suitable pressure, and the inert gas enters the smelting chamber 2 after being heated by the gas heating device 8;

[0032] 4) Turn on the coil power supply to melt the bar 6;

[0033] 5) turning on the ultrasonic transducer 10 to ultrasonically break the melted droplets into small droplets;

[0034] 6) After the ultrasonically broken droplets are carried into the Laval nozzle 5 by the high-pressure gas, they are atomized in the atomization chamber 3 and solidified to form spherical metal powder;

[0035] 7) After the melting of the rod 6 is completed, the material head returns upward to the material changing chamber 1 under the control of the rotating lifting mechanism, the partition is closed, and a new rod 6 is replaced, and the above process is repeated.

[0036] The present invention first heats the high-pressure inert gas used for atomization, which helps to increase the subsequent droplet superheat; secondly, an ultrasonic device is installed in the atomization chamber to ultrasonically crush the metal droplets after electrode induction heating; at the same time, the conical angle and number of turns of the conical induction coil are increased, so that the droplets stay in the induction coil for more time to be heated, and obtain a higher superheat. At the same time, the surrounding environment is also an overheated environment, further improving the superheat. Finally, the superheated metal droplets are further crushed into fine droplets by the high-pressure hot gas and enter the cooling tower to form fine powder particles.

[0037] The present invention introduces ultrasonic transducers and hot gas into electrode induction technology to increase the superheat of droplets, further refine powder, increase the fine powder recovery rate, and improve production efficiency, which can be increased by more than 10% at most.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An electrode-induced ultrasonic hot gas atomization powder making device, characterized in that: It includes a material changing chamber, a smelting chamber and an atomizing chamber which are arranged in sequence from top to bottom. The material changing chamber is provided with a rotating lifting mechanism for driving the bar material to lift and rotate. The smelting chamber is provided with an induction coil for heating and melting the bar material and an ultrasonic transducer for breaking the molten droplets into small droplets. An inert gas inlet pipe is connected to one side of the smelting chamber, and a gas heating device is provided on the inert gas inlet pipe. The atomizing chamber is provided with a nozzle for atomizing the molten droplets.

2. The electrode-induced ultrasonic hot gas atomization powder making device according to claim 1 is characterized in that: An openable and closable partition is provided between the material changing chamber and the smelting chamber, a bracket is vertically provided in the material changing chamber, a slider which can move up and down is provided on the bracket, the rotary lifting mechanism comprises a lifting motor which can drive the slider to move up and down and a rotating motor which drives the rod to rotate, the lifting motor is fixed to the upper end of the bracket, the rotating motor is installed on the slider, and the upper end of the rod is connected to the rotating motor through a clamping device.

3. The electrode-induced ultrasonic hot gas atomization powder making device according to claim 2 is characterized in that: The induction coil is a multi-turn large-angle conical coil coaxially arranged with the rod.

4. The electrode-induced ultrasonic hot gas atomization powder making device according to claim 3 is characterized in that: The material changing chamber and the smelting chamber are pressure-resistant devices with a pressure resistance of not less than 3.0 MPa, and a pressure regulating valve is installed on the inert gas inlet pipe.

5. The electrode-induced ultrasonic hot gas atomization powder making device according to claim 4 is characterized in that: There are at least two ultrasonic transducers, which are symmetrically arranged on the outside of the induction coil.

6. The electrode-induced ultrasonic hot gas atomization powder making device according to claim 5 is characterized in that: The nozzle is a Laval nozzle.

7. An electrode-induced ultrasonic hot gas atomization powder making method, characterized in that: The electrode-induced ultrasonic hot gas atomization powder making device according to any one of claims 1 to 6 is used for preparation, and the specific steps are as follows: 1) Install the bar: lower the partition to separate the material changing chamber from the melting chamber, install the bar on the slider through the clamping device and connect it to the rotating motor; 2) The material changing chamber is evacuated to a specified vacuum degree, the partition is raised, the material changing chamber is connected with the smelting chamber, and the titanium alloy bar enters the induction coil downward at a certain rotation speed and movement speed under the control of the rotating motor and the lifting motor; 3) Adjust the valve of the pressure regulating valve to adjust the pressure in the smelting chamber to a suitable pressure, and the inert gas enters the smelting chamber after being heated by the gas heating device; 4) Turn on the coil power supply to melt the bar; 5) Turn on the ultrasonic transducer to ultrasonically break the melted droplets into small droplets; 6) After ultrasonic crushing, the small droplets are carried into the Laval nozzle by high-pressure gas, atomized in the atomization chamber, and solidified to form spherical metal powder; 7) After the melting of the bar material is completed, the material head returns upward to the material changing chamber under the control of the rotating lifting mechanism, the partition is closed, the new bar material is replaced, and the above process is repeated.

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