Low-cost spherical powder gas atomization preparation device and preparation method

Abstract

The low-cost spherical powder gas atomization preparation device comprises a material changing chamber, a smelting chamber and an atomizing chamber which are sequentially arranged from top to bottom, a partition plate capable of being opened and closed is arranged between the material changing chamber and the smelting chamber, and a material changing chamber door and a scavenging valve are arranged on the material changing chamber; a rotary lifting mechanism for driving a metal tube filled with raw material powder to move up and down is arranged in the material changing chamber, the components of the metal tube are the same as those of the raw material powder, an induction coil for heating, curing and remelting the metal tube and the powder is arranged in the smelting chamber, and a spraying disc for atomizing molten liquid drops is arranged in the atomizing chamber. The preparation device is reasonable in structure, small in investment and convenient to operate, the preparation method is simple in process and short in flow, the production procedures of bar smelting, forging, machining and the like are reduced, the raw material cost of atomization powder making is reduced, sintering and smelting atomization powder making are carried out at the same time, and coarse metal powder can be recycled for atomization powder making again.

Description

Technical Field

[0001] The invention belongs to the technical field of atomization powder making, and relates to a low-cost spherical powder aerosol preparation device and a preparation method. Background Art

[0002] The electrode induction gas atomization powder making process is to regionally refine the prefabricated alloy rods under appropriate vacuum conditions and protective gas conditions. The metal liquid flows continuously and vertically downward through the nozzle. The high-pressure airflow through the nozzle atomizes the metal liquid into a large number of fine droplets, and the droplets solidify into particles in flight.

[0003] Electrode Induction Gas Atomization (EIGA) is the primary technology for producing titanium alloy powders due to its advantages in purity, powder production efficiency, and fine powder yield. However, the raw material for producing spherical metal powders using EIGA is bar stock. Bar stock preparation requires batching, smelting, forging, peeling, and machining, resulting in a long, energy-intensive, and costly process. Since raw material costs account for over 70% of powder costs, reducing them is an effective way to reduce powder costs.

[0004] Therefore, it is necessary to develop a low-cost spherical powder aerosol preparation method and device to solve the current problem of high raw material preparation costs. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a low-cost spherical powder aerosol preparation device with reasonable structure, small investment and convenient operation.

[0006] The second technical problem to be solved by the present invention is to provide a low-cost aerosol preparation method of spherical powder with simple process and short flow.

[0007] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a low-cost spherical powder aerosol preparation device, characterized in that: it includes a material changing chamber, a smelting chamber and an atomizing chamber arranged in sequence from top to bottom, an openable and closable partition is provided between the material changing chamber and the smelting chamber, a material changing chamber door and an air exchange valve are provided on the material changing chamber, a rotating lifting mechanism is provided in the material changing chamber for driving a metal tube filled with raw material powder to move up and down, the composition of the metal tube is the same as that of the raw material powder, the smelting chamber is provided with an induction coil for heating, solidifying and remelting the metal tube and powder, and the atomizing chamber is provided with a spray disc for atomizing the melted droplets.

[0008] As an improvement, a bracket is vertically provided in the material changing chamber, and a slider that can move up and down is provided on the bracket. The rotating lifting mechanism includes a lifting motor that can drive the slider to move up and down and a rotating motor that drives the metal tube to rotate. The lifting motor is fixed at the upper end of the bracket, and the rotating motor is installed on the slider. The upper end of the metal tube is connected to the rotating motor through a clamping device.

[0009] Furthermore, the upper end of the metal tube is provided with a feeding port and the bottom is a closed cone tube. The raw material powder can be pure metal powder or a mixture of multiple metal powders.

[0010] Finally, the induction coils are two groups, one above the other, coaxially arranged with the metal tube, wherein the upper one is a common pre-sintered induction coil and the lower one is a conical induction coil.

[0011] The technical solution adopted by the present invention to solve the second technical problem is: a low-cost spherical powder aerosol preparation method, characterized in that: the preparation is carried out using the preparation device described in claim 4, and the specific steps are:

[0012] 1) Charging: Select a uniformly mixed powder, add it to a metal tube with the same composition and sealed at the bottom, vibrate it and then load it into the EIGA powder making furnace;

[0013] 2) When the metal tube filled with powder slowly descends to the pre-sintering induction coil under the control of the rotary lifting mechanism, the pre-sintering induction coil is energized to heat the metal tube, causing the powder inside the metal tube to be pre-sintered and formed;

[0014] 3) The solidified metal tube and raw material powder, under the control of the rotary lifting mechanism, move downward into the conical induction coil at a certain rotation speed and movement speed to achieve the melting of the raw materials in the metal tube;

[0015] 4) The melted droplets enter the spray plate, where high-pressure atomizing gas blows the droplets into atomized form, solidifying them into spherical metal powder;

[0016] 5) After melting, the material head is driven by the rotary lifting mechanism to rise to the material exchange chamber, close the partition, open the air exchange valve, then open the material exchange chamber door, replace the new metal tube containing the raw material powder, and repeat the above steps.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] A sintering induction coil and a conical induction coil are provided, and an induction melting and sintering method is used to sinter and solidify the uniform powder material, and then the conical induction coil is used to melt the raw material in the metal tube. The preparation device of the present invention has a reasonable structure, low investment, and convenient operation. The preparation method of the present invention is simple and has a short process flow, eliminating production processes such as bar melting, forging, and machining, reducing the raw material cost of atomized powder production, and realizing sintering and melting atomized powder production. The present invention can also reuse the coarse metal powder for atomization powder production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a low-cost spherical powder aerosol preparation device provided by the present invention;

[0020] Figure 2 It is a structural diagram of a metal tube. DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 、 2 As shown, a low-cost spherical powder aerosol preparation device includes a material change chamber 1, a smelting chamber 2 and an atomizing chamber 3 arranged in sequence from top to bottom. The function of the material change chamber 1 is to replenish the metal tube 5 raw material without affecting the gas environment and melting continuity in the smelting chamber 2. An openable and closable partition 8 is provided between the material change chamber 1 and the smelting chamber 2. The material change chamber 1 is provided with a material change chamber door 10 and a gas exchange valve 11. A rotating lifting mechanism 4 is provided in the material change chamber 1 for driving the metal tube 5 filled with raw material powder to move up and down. The composition of the metal tube 5 is the same as that of the raw material powder. The smelting chamber 2 is provided with induction coils 6 and 7 for heating, solidifying and remelting the metal tube 5 and the powder. The atomizing chamber 3 is provided with a spray disc 9 for atomizing the melted droplets.

[0023] The specific structure is as follows: the function of the partition 8 is to separate the refueling chamber 1 and the smelting chamber 2. When melting is carried out in the smelting chamber 2, the partition 8 is opened and raised, and the refueling chamber 1 is connected with the smelting chamber 2. When the metal tube 2 containing raw materials in the refueling chamber 1 is about to be used up and bar materials need to be replenished, the partition 8 is lowered to separate the refueling chamber 1 from the smelting chamber 2, the ventilation valve 11 is opened, and air is filled into the refueling chamber 1. Then, the refueling chamber door 10 is opened to replenish raw materials into the refueling chamber 1, and the vacuum is evacuated to a specified vacuum level. Then, the partition 8 is opened to connect the refueling chamber 1 with the smelting chamber 2.

[0024] A bracket 12 is vertically mounted within the refueling chamber 1, on which is mounted a slider 13 that can move up and down. The rotary lifting mechanism 4 includes a lifting motor 41 that drives the slider 13 up and down, and a rotary motor 42 that rotates the metal tube 5. The lifting motor 41 is fixed to the upper end of the bracket 12 and drives the slider 13 up and down via a gear rack transmission mechanism or a chain sprocket transmission mechanism. The rotary motor 42 is mounted on the slider 13, and the upper end of the metal tube 5 is connected to the rotary motor 42 via a clamping device. The upper end of the metal tube 5 is provided with a feeding port 51 and a closed conical tube 52 at the bottom. The raw material powder can be pure metal powder or a mixture of multiple metal powders.

[0025] The induction coils 6 and 7 are two groups, one above the other, coaxially arranged with the metal tube 5 , wherein the upper one is a common pre-sintered induction coil 6 and the lower one is a conical induction coil 7 .

[0026] A low-cost spherical powder aerosol preparation method is prepared using the above-mentioned preparation device, and the specific steps are as follows:

[0027] 1) Charging: Select a uniformly mixed powder and add it to the metal tube 5 with the same composition and sealed at the bottom. After vibrating, load it into the EIGA powder making furnace;

[0028] 2) When the metal tube 5 filled with powder slowly descends to the pre-sintering induction coil 6 under the control of the rotary lifting mechanism 4, the pre-sintering induction coil 6 is energized to heat the metal tube 5, so that the powder in the metal tube 5 is pre-sintered and formed;

[0029] 3) The solidified metal tube 5 and raw material powder, under the control of the rotary lifting mechanism 4, move downward into the conical induction coil 7 at a certain rotation speed and movement speed, thereby melting the raw materials in the metal tube 5;

[0030] 4) The melted droplets enter the spray plate 9, which contains high-pressure atomizing gas, blowing the droplets into atomized form and solidifying them into spherical metal powder;

[0031] 5) After melting is completed, the material head is driven by the rotary lifting mechanism 4 to rise to the material exchange chamber 1, the partition 8 is closed, the ventilation valve 11 is opened, and then the material exchange chamber door 10 is opened. A new metal tube 5 filled with raw material powder is replaced and the above steps are repeated.

[0032] The present invention realizes sintering and melting atomization powder production, with low overall investment, short process, low cost and simple operation. Coarse metal powder can also be remelted and atomized into fine powder by this method.

[0033] 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 within the scope of protection of the present invention.

Claims

1. A low-cost spherical powder atomization preparation device, characterized by: It includes a material changing chamber, a smelting chamber and an atomizing chamber which are arranged in sequence from top to bottom. An openable and closable partition is arranged between the material changing chamber and the smelting chamber. The material changing chamber is provided with a material changing chamber door and a ventilation valve. The material changing chamber is provided with a rotating lifting mechanism for driving a metal tube filled with raw material powder to move up and down. The composition of the metal tube is the same as that of the raw material powder. The smelting chamber is provided with an induction coil for heating, solidifying and remelting the metal tube and powder. The atomizing chamber is provided with a spray disc for atomizing the melted droplets.

2. The low-cost spherical powder atomization preparation device according to claim 1, characterized in that: A bracket is vertically provided in the material changing chamber, and 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 metal tube to rotate. The lifting motor is fixed to the upper end of the bracket, and the rotating motor is installed on the slider. The upper end of the metal tube is connected to the rotating motor through a clamping device.

3. The low-cost spherical powder atomization preparation device according to claim 2, characterized in that: The upper end of the metal tube is provided with a feeding port, and the bottom is a closed cone tube. The raw material powder is pure metal powder or a plurality of mixed metal powders.

4. The preparation device according to claim 3, characterized in that: The induction coils are composed of two groups, upper and lower, coaxially arranged with the metal tube, wherein the upper one is a common pre-sintered induction coil and the lower one is a conical induction coil.

5. A low-cost spherical powder aerosol preparation method, characterized in that: The preparation is carried out using the preparation device described in claim 4, and the specific steps are: 1) Charging: Select the uniformly mixed powder, add it into the metal tube with the same composition and sealed at the bottom, and then load it into the EIGA powder making furnace after compaction; 2) When the metal tube filled with powder slowly descends to the pre-sintering induction coil under the control of the rotating lifting mechanism, the pre-sintering induction coil is energized to heat the metal tube, so that the powder in the metal tube is pre-sintered and formed; 3) The solidified metal tube and raw material powder, under the control of the rotating lifting mechanism, move downward into the conical induction coil at a certain rotation speed and movement speed to achieve the melting of the raw materials in the metal tube; 4) The melted droplets enter the spray plate, and the high-pressure atomizing gas in the spray plate blows the droplets into atomization and solidifies them into spherical metal powder; 5) After melting, the material head is driven by the rotating lifting mechanism to rise to the material exchange chamber, close the partition, open the air exchange valve, then open the material exchange chamber door, replace the new metal tube containing the raw material powder, and repeat the above steps.

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