CN210023786U - Device for producing spherical metal powder for 3D printing - Google Patents
Device for producing spherical metal powder for 3D printing Download PDFInfo
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- CN210023786U CN210023786U CN201920357846.9U CN201920357846U CN210023786U CN 210023786 U CN210023786 U CN 210023786U CN 201920357846 U CN201920357846 U CN 201920357846U CN 210023786 U CN210023786 U CN 210023786U
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Abstract
The utility model discloses a device for producing spherical metal powder for 3D printing, which comprises an overflow feeding device, a steel furnace top, a high-temperature melting spheroidization chamber and a forming cooling chamber which are sequentially arranged from top to bottom, and the device ensures the oxygen content requirement in the product by combining the control of spheroidization atmosphere on the basis of utilizing an outfield to heat spheroidization; adopt the mode of overflow feed, through adjustment fluidization chamber structure and fluidization gas velocity, the particle size distribution of effective control raw materials sieves the large granule that is not conform to the product granularity in advance, alleviates balling burden, improves production efficiency, and the fluidization feed mode makes the raw materials go into stove homodisperse simultaneously, avoids gluing, has reduced the satellite ball.
Description
Technical Field
The invention belongs to the technical field of 3D printing, and particularly relates to a method and a device for producing spherical metal powder for 3D printing by utilizing an outfield heating spheroidization.
Background
3D printing is a hotspot in the current manufacturing industry due to the advantages of net forming, automation, short period, convenience, rapidness, individualization and the like. The 3D printing technology of metal parts is the most advanced technology in the whole 3D printing system and is an important development direction of advanced manufacturing technology.
With the rapid development of 3D printing technology, the demand for high-quality fine spherical powder is increasingly vigorous. The conventional metal powder preparation includes mechanical methods (mechanical grinding, cold gas pulverization, two-flow atomization, rotary disk atomization, rotary electrode atomization, plasma atomization), and physicochemical methods (reduction, deposition, electrolysis, and electrochemical corrosion), while the main production processes of the current 3D printing raw materials are water atomization, gas atomization, plasma spheroidization, and the like. The preparation methods of the powders have the disadvantages that the water atomization method has high efficiency, but the product has irregular shape and higher oxygen content; inert gas can be used as an atomizing medium for gas atomization, so that oxidation can be effectively avoided, but the gas kinetic energy is small, the production efficiency is low, and the problem of satellite balls is serious; the plasma spheroidization method has good spheroidization effect, but has high production cost and large energy consumption, and the plasma flame temperature is too high, so that some metals with lower melting points volatilize. The invention provides a method and a device for producing spherical metal powder for 3D printing by using irregular metal powder as a raw material.
Disclosure of Invention
In view of the above-mentioned problems in the prior art, a method and an apparatus for producing spherical metal powder for 3D printing are provided. The invention can efficiently and continuously produce the spherical metal powder for 3D printing, which meets the requirement of granularity, has high sphericity, good fluidity, low oxygen content and no satellite ball, mainly through the heating and spheroidization of the external field.
The technical means adopted by the invention are as follows:
the utility model provides a production 3D prints device with spherical metal powder, includes overflow feeder, high temperature melting balling chamber, shaping cooling chamber that from top to bottom installs in proper order.
The bottom of the overflow feeding device is connected with the gas storage tank, the upper part of the overflow feeding device is provided with a metal powder feeding port and a fluidizing gas outlet pipe, the middle part of the overflow feeding device is a fine powder fluidizing chamber, and the lower part of the left side of the overflow feeding device is connected with the center of the steel furnace top and is provided with a metal powder discharging port.
The steel furnace top, the high-temperature melting spheroidizing chamber and the forming cooling chamber are positioned on the same axis.
The heat-resistant lining of the high-temperature melting spheroidizing chamber is made of corundum or silicon carbide materials, a heating rod made of silicon molybdenum or nickel-chromium alloy is embedded inside the heat-resistant lining, and the heat-insulating brick is a light magnesia brick or a high-aluminum refractory brick. The highest temperature control value of the melting chamber is determined by the melting point of the processed metal powder and is controlled to be higher than the melting point of the metal powder by more than 100 ℃.
The inner wall of the formed cooling chamber is a steel lining made of heat-resistant steel, the middle layer is a light magnesia brick or a high-alumina insulating brick with a cooling wall embedded inside, the outer layer adopts a steel furnace shell, and the bottom of the formed cooling chamber is provided with a product discharge hole.
Preferably, the fine powder fluidizing chamber of the overflow feeding device is a fluidized bed which uses inert gas and metal powder as fluidized gas-solid medium, a coarse powder outlet is arranged at the lower part of the fine powder fluidizing chamber, and the actual fluidizing chamber structure is adjusted according to the type and physical property parameters of the raw material powder and the product requirement.
Preferably, the height of the high-temperature melting and spheroidizing chamber is more than 1.5m, the top end of the high-temperature melting and spheroidizing chamber is provided with an inert/reducing gas outlet, a furnace type which is gradually expanded from top to bottom is adopted, the included angle between the inner wall and the horizontal direction is 80-86 degrees, and the angle of the furnace type is adjusted according to the divergence degree of materials in the falling process in the furnace; the continuous working temperature is higher than 800 ℃, the highest temperature can reach 1700 ℃, multi-section type accurate temperature control is adopted, and the actual production temperature is adjusted in real time according to the property and the production efficiency of the actual metal powder raw material.
Preferably, the height of the forming cooling chamber is more than 1.0, a furnace type which is gradually contracted from top to bottom is adopted, the included angle between the inner wall of the upper part and the horizontal direction is 85 degrees, the included angle between the inner wall of the lower part and the horizontal direction is 33 degrees, a product discharge hole and a discharge valve are arranged at the bottom, and the forming cooling chamber can be opened and closed according to the storage amount in the forming cooling chamber; the cooling wall at the lower part of the forming cooling chamber adopts circulating cooling water as a cooling medium, and the flow rate of the cooling water can be adjusted according to the actual temperature of the forming cooling chamber.
The use method for producing the spherical metal powder for 3D printing by the device comprises the following steps:
opening an inert reducing gas inlet and an inert reducing gas outlet, introducing inert gas to ensure that the oxygen content in the fine powder fluidization chamber and the forming cooling chamber is lower than 0.1%, switching the inert reducing gas inlet and introducing inert gas mixed with reducing gas with the proportion of 5%; and starting a power supply of the heating system to ensure that the temperature of the high-temperature melting spheroidizing chamber reaches a proper working range.
Opening a fluidizing gas valve, leading inert gas to enter a fine powder fluidizing chamber after passing through a gas storage tank, exhausting air to ensure that the oxygen content in the fine powder fluidizing chamber is lower than 0.1 percent, adding metal powder into the fine powder fluidizing chamber through a metal powder feeding port, adjusting the flow rate of the fluidizing gas valve and the powder feeding speed, discharging gas overflowing a fluidized layer through a fluidizing gas outlet pipe, leading fine particles with qualified particle size distribution in the fluidizing chamber to be in a fluidized state, and depositing coarse particles with large particle size at a coarse powder discharging port for intermittent discharge.
Opening the partition board of the fluidizing chamber to make the powder overflowing the partition board of the fluidizing chamber enter the discharge port of the metal powder, uniformly dispersed through the steel furnace top and enter the high-temperature melting and spheroidizing chamber, fully preheating the upper part of the high-temperature melting and spheroidizing chamber, melting the middle part of the high-temperature melting and spheroidizing chamber, forming the particles into spheres by the surface tension of the metal liquid drops, rapidly reducing the partially oxidized particles in the raw materials in the temperature region reaching the reduction temperature, allowing the spherical liquid drops to enter the forming and cooling chamber for gradually cooling, solidifying and forming the lower part of the high-temperature melting and spheroidizing chamber until the bottom of the forming and cooling chamber is cooled to below 70 ℃, and effectively preventing the gas carrying powder from flowing out by controlling the discharge valve to discharge the steel baffle plate arranged at the inert/reducing gas outlet in a.
The reduction reaction in the high-temperature melting spheroidization chamber is extremely rapid and completed within 2 seconds in the high-temperature melting zone.
Preferably, the inert gas mixed with a reducing gas in a proportion of 5% fed into the furnace through the inert/reducing gas inlet is 5% H295% Ar mixed gas or 5% CO and 95% Ar mixed gas.
Preferably, the inert gas in the powder fluidizing chamber is high-purity Ar.
The process method of the invention has strong controllability, and the advantages are represented by the following points: the overflow feeding mode is adopted, the particle size distribution of the raw materials can be effectively controlled by adjusting the structure of the fluidization chamber and the fluidization gas velocity, large particles which do not accord with the particle size of the product are selected in advance before the raw materials enter the furnace, the spheroidizing burden is reduced, the raw materials enter the furnace to be uniformly dispersed in the fluidization feeding mode, and the adhesion is avoided; the high-temperature melting spheroidizing chamber adopts multi-section temperature control, and the temperature in the furnace can be accurately controlled; oxygen contained in the fine metal droplets in the high-temperature melting spheroidizing chamber reacts with the reducing gas very quickly, and the oxygen content of the particles can be effectively controlled by controlling the proportion of the reducing gas of the mixed gas added into the furnace through the inert/reducing gas inlet.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention;
the parts in the figures are numbered:
1. an overflow feeding device; 2. a steel furnace top; 3. a steel baffle plate; 4. a first steel furnace shell; 5. a first cooling wall; 6. 1, insulating bricks I; 7. a steel lining; 8. a forming cooling chamber; 9. a product discharge port; 10. a discharge valve; 11. a second steel furnace shell; 12. a second cooling wall; 13. a second insulating brick; 14. an inert reducing gas inlet; 15. A heat resistant inner liner; 16. a high-temperature melting spheroidizing chamber; 17. a heating rod; 18. an inert reducing gas outlet; 19. a fluidizing gas valve; 20. a gas storage tank; 21. a powder fluidization chamber; 22. a fluidizing gas outlet; 23. a metal powder feeding port; 24. a fluidization chamber partition; 25. a metal powder discharge port; 26. and a coarse powder outlet.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
As shown in figure 1, the device for producing the spherical metal powder for 3D printing comprises an overflow feeding device (1), a steel furnace top (2), a high-temperature melting spheroidization chamber (16) and a forming cooling chamber (8) which are sequentially arranged from top to bottom.
The bottom of the overflow feeding device (1) is connected with a gas storage tank (20), the upper part of the overflow feeding device is provided with a metal powder feeding port (23) and a fluidizing gas outlet pipe (22), the middle part of the overflow feeding device is provided with a fine powder fluidizing chamber (21), and the lower part of the left side of the overflow feeding device is connected with the center of the steel furnace top (2) to form a metal powder discharging port (25).
The top of the high-temperature melting spheroidization chamber (16) is connected with the bottom of the steel furnace roof (2), the high-temperature melting spheroidization chamber mainly comprises an inner layer heat-resistant lining (15), a middle layer insulating brick (6) and an outer layer steel furnace shell (4) which are of a three-layer structure, a whole set of copper cooling wall (5) is embedded inside the high-temperature melting spheroidization chamber, an inert/reducing gas outlet (18) and an inert/reducing gas inlet (14) which are uniformly distributed along the radial direction of the circumference are respectively arranged at the upper part and the lower part of the high-temperature melting spheroidization chamber (16), and the inert/reducing gas outlet (18) is provided with.
The steel furnace top (2), the high-temperature melting spheroidizing chamber (16) and the forming cooling chamber (8) are positioned on the same axis.
Preferably, the inner wall of the forming cooling chamber (8) is a steel lining (7) made of heat-resistant steel, the middle layer is a light magnesia brick or a high-aluminum insulating brick (13) with a second cooling wall (12) embedded inside, the outer layer is a steel furnace shell (11), and a product discharge hole (9) is formed in the bottom of the outer layer.
The fine powder fluidizing chamber (21) of the overflow feeding device (1) is a fluidized bed which takes inert gas and metal powder as fluidized gas-solid medium, the height of the fine powder fluidizing chamber (21) is 0.6-1 m, the radius is more than 0.15m, the lower part of the fine powder fluidizing chamber (21) is provided with a coarse powder outlet (26), and the actual structure of the fine powder fluidizing chamber (21) is adjusted according to the type and physical parameters of raw material powder and product requirements.
Preferably, the heat-resistant lining (15) of the high-temperature melting and spheroidizing chamber (16) is made of corundum or silicon carbide materials, a heating rod (17) made of silicon-molybdenum or nickel-chromium alloy is embedded inside the heat-resistant lining, and the first insulating brick (6) is a light magnesia brick or a high-aluminum refractory brick.
Preferably, the high-temperature melting spheroidizing chamber (16) is 2.5-3.0 m in height, an inert/reducing gas outlet (18) is arranged at a position which is 15cm away from the top end of the high-temperature melting spheroidizing chamber, a top-down gradually expanding furnace type is adopted, the included angle between the inner wall and the horizontal direction is 80-86 degrees, and the angle of the furnace type is adjusted according to the divergence degree of materials in the falling process in the furnace; the continuous working temperature is 800-1600 ℃, the highest temperature can reach 1700 ℃, three-section type accurate temperature control is adopted, and the actual production temperature is adjusted in real time according to the property and the production efficiency of the actual metal powder raw material.
The height of the forming cooling chamber (8) is 1.2-1.5 m, which is about 0.4 time of the volume of the high-temperature melting spheroidizing chamber (16), a furnace type which is gradually contracted from top to bottom is adopted, the included angle between the inner wall of the upper part and the horizontal direction is 85 degrees, the included angle between the inner wall of the lower part and the horizontal direction is 33 degrees, and a product discharge port (9) and a discharge valve (10) are arranged at the bottom and can be opened and closed according to the storage amount in the forming cooling chamber (8); and a second cooling wall (12) at the lower part of the forming cooling chamber (8) adopts circulating cooling water as a cooling medium, and the flow rate of the cooling water can be adjusted according to the actual temperature of the forming cooling chamber (8).
A method for producing spherical metal powder for 3D printing by using the device comprises the following steps:
opening an inert reducing gas inlet (11) and an inert reducing gas outlet (11), introducing inert gas to ensure that the oxygen content in the fine powder fluidization chamber (21) and the forming cooling chamber (8) is lower than 0.1%, and switching the inert reducing gas inlet (11) to introduce the inert gas mixed with reducing gas with the proportion of 5%; and starting a power supply of the heating system to ensure that the temperature of the high-temperature melting spheroidizing chamber (16) reaches a proper working range.
Opening a fluidizing gas valve (16), leading inert gas to enter a fine powder fluidizing chamber (21) through a gas storage tank, exhausting air to ensure that the oxygen content in the fine powder fluidizing chamber (21) is lower than 0.1%, adding metal powder into the fine powder fluidizing chamber (21) through a metal powder feeding port (23), adjusting the flow rate of a fluidizing gas valve (19) and the powder feeding speed, discharging gas overflowing a fluidized layer through a fluidizing gas outlet pipe, leading fine particles with qualified particle size distribution in the fluidizing chamber to be in a fluidized state, and leading coarse particles to be deposited at a coarse powder discharging port (26) for intermittent discharge.
Opening a partition plate (24) of a fluidizing chamber, enabling powder overflowing the partition plate (24) of the fluidizing chamber to enter a metal powder discharge port (25), uniformly dispersing the powder through a steel furnace top (2), entering a high-temperature melting and spheroidizing chamber (16), fully preheating the upper part of the high-temperature melting and spheroidizing chamber, melting the middle part of the high-temperature melting and spheroidizing chamber, enabling the middle lower part of the high-temperature melting and spheroidizing chamber to be completely liquid, enabling particles to form spheres by self surface tension of metal droplets, rapidly reducing the partially oxidized particles in the raw materials in a temperature region reaching the reduction temperature, completely spheroidizing the bottom of the high-temperature melting and spheroidizing chamber (16), enabling the spherical droplets to enter a forming cooling chamber (8), gradually cooling the spherical droplets to reach the middle lower part of the high-temperature melting and spheroidizing chamber, cooling the bottom of.
The inert/reducing gas outlet (18) is provided with a steel baffle (3) which can effectively prevent the gas carried powder from flowing out.
The spheroidized product is not limited to the application in the field of 3D printing, but also can be used in powder metallurgy, spraying and other fields.
The reduction reaction in the high-temperature melting spheroidizing chamber (16) occurs extremely rapidly and is completed within 1 second of the high-temperature melting zone.
Preferably, the inert gas mixed with a 5% proportion of reducing gas introduced into the furnace through the inert/reducing gas inlet (18) is 5% H295% Ar mixed gas or 5% CO and 95% Ar mixed gas.
Preferably, the device for producing the spherical metal powder for 3D printing is characterized in that the inert gas in the powder fluidizing chamber (18) is high-purity Ar.
The following are specific examples of the present invention, but the scope of the present invention is not limited to the contents of the following examples.
Example 1
Copper powder with the granularity of-140 meshes to +325 meshes produced by an electrolytic method is used as a raw material to produce spherical copper powder products with the granularity of 45 mu m to 105 mu m, and the yield is 300 kg/h.
The height of the fine powder fluidization chamber (21) in the embodiment is 0.7 m; a heat-resistant lining (15) of the high-temperature melting spheroidizing chamber (16) is made of corundum, and a heating rod (17) is made of silicon-molybdenum material; the height of the high-temperature melting spheroidizing chamber (16) is 2.5m, the included angle between the inner wall of the high-temperature melting spheroidizing chamber and the horizontal direction is 86 degrees, and the highest temperature area is controlled to be 1400 ℃; the height of the forming cooling chamber (8) is 1.2 m; the inert gas mixed with 5% of reducing gas added into the furnace through the inert/reducing gas inlet (18) is mixed gas of 5% CO and 95% Ar.
Opening an inert reducing gas inlet (11) and an inert reducing gas outlet (11), introducing argon at the flow rate of 15L/min, detecting the oxygen content of the inert reducing gas outlet (11) after 30min, and switching the inert reducing gas inlet (11) to introduce argon mixed with 5% of CO if the oxygen content is lower than 0.1% in a 5min time period; and starting a power supply of a heating system to ensure that the temperature of the high-temperature melting spheroidizing chamber (16) reaches a proper working range, and the highest temperature region reaches 1400 ℃.
Opening a fluidizing gas valve (16), introducing argon into a fine powder fluidizing chamber (21), slowly adding electrolytic copper powder into the fine powder fluidizing chamber (21) through a metal powder feeding port (23) when the oxygen content in the fine powder fluidizing chamber (21) is lower than 0.1%, adjusting the flow rate of the fluidizing gas valve (19) to 0.7m/s, wherein fine particles in the fluidizing chamber are in a fluidized state, and coarse particles with the particle size of more than 105 mu m are deposited at a coarse powder discharging port (26) and are intermittently discharged.
Opening a partition plate (24) of a fluidizing chamber, enabling powder overflowing the partition plate (24) of the fluidizing chamber to enter a metal powder discharge port (25), uniformly dispersing the powder through a steel furnace top (2), entering a high-temperature melting spheroidizing chamber (16), fully preheating the upper part of the high-temperature melting spheroidizing chamber, melting the middle part of the high-temperature melting spheroidizing chamber, enabling the middle lower part of the high-temperature melting spheroidizing chamber to be completely liquid, enabling particles to form spheres by self surface tension of metal droplets, rapidly reducing the partially oxidized particles in the raw materials to reach the middle part of the high-temperature melting spheroidizing chamber (16), completely spheroidizing the bottom of the high-temperature melting spheroidizing chamber (16), enabling the spherical droplets to enter a forming cooling chamber (8), gradually cooling the spherical droplets to reach the middle lower part of the forming cooling chamber, cooling the bottom of the forming cooling chamber (.
Example 2
The 718 high-temperature alloy powder with the granularity of-300 meshes to +1000 meshes produced by a water atomization method is used as a raw material to produce a 718 high-temperature alloy spherical powder product with the granularity of 15 mu m to 53 mu m, and the yield is 220 kg/h.
The height of the fine powder fluidization chamber (21) in the embodiment is 0.9 m; a heat-resistant lining (15) of the high-temperature melting spheroidizing chamber (16) is made of corundum, and a heating rod (17) is made of nickel-chromium alloy; the height of the high-temperature melting spheroidizing chamber (16) is 2.8m, and the inner wall of the high-temperature melting spheroidizing chamber is in the horizontal directionThe included angle is 84 degrees, and the highest temperature area is controlled to be 1600 degrees; the height of the forming cooling chamber (8) is 1.4 m; the inert gas mixed with 5% of reducing gas added into the furnace through the inert/reducing gas inlet (18) is 5% H2And 95% Ar mixed gas.
Opening an inert reducing gas inlet (11) and an inert reducing gas outlet (11), introducing argon at the flow rate of 15L/min, detecting the oxygen content of the inert reducing gas outlet (11) after 35min, and switching the inert reducing gas inlet (11) to introduce H mixed with 5% of H within 5min when the oxygen content is lower than 0.1% within 5min2Argon gas of (2); and starting a power supply of a heating system to ensure that the temperature of the high-temperature melting spheroidizing chamber (16) reaches a proper working range, and the highest temperature region reaches 1600 ℃.
Opening a fluidizing gas valve (16), introducing argon into a fine powder fluidizing chamber (21), when the oxygen content in the fine powder fluidizing chamber (21) is lower than 0.1%, slowly adding 718 high-temperature alloy powder into the fine powder fluidizing chamber (21) through a metal powder feeding port (23), adjusting the flow rate of a fluidizing gas valve (19) to 0.28m/s, wherein fine particles in the fluidizing chamber are in a fluidized state, and coarse particles with the particle size of more than 53 mu m are deposited at a coarse powder discharging port (26) and are intermittently discharged.
Opening a partition plate (24) of a fluidizing chamber, enabling powder overflowing the partition plate (24) of the fluidizing chamber to enter a metal powder discharge port (25), uniformly dispersing the powder through a steel furnace top (2), entering a high-temperature melting spheroidizing chamber (16), fully preheating the upper part of the high-temperature melting spheroidizing chamber, melting the middle part of the high-temperature melting spheroidizing chamber, enabling the middle lower part of the high-temperature melting spheroidizing chamber to be completely liquid, enabling particles to form spheres by self surface tension of metal droplets, rapidly reducing the partially oxidized particles in the raw materials to reach the middle part of the high-temperature melting spheroidizing chamber (16), completely spheroidizing the bottom of the high-temperature melting spheroidizing chamber (16), enabling the spherical droplets to enter a forming cooling chamber (8), gradually cooling the spherical droplets to reach the middle lower part of the forming cooling chamber, cooling the bottom of the forming cooling chamber (.
Claims (3)
1. A device for producing spherical metal powder for 3D printing is characterized by comprising an overflow feeding device (1), a high-temperature melting spheroidizing chamber (16) and a forming cooling chamber (8) which are sequentially arranged from top to bottom;
the bottom of the overflow feeding device (1) is connected with a gas storage tank (20), the upper part of the overflow feeding device is provided with a metal powder feeding port (23) and a fluidizing gas outlet pipe (22), the middle part of the overflow feeding device is a fine powder fluidizing chamber (21), and the lower part of the left side of the overflow feeding device is connected with the center of the steel furnace top (2) to form a metal powder discharging port (25);
the top of the high-temperature melting and spheroidizing chamber (16) is connected with the bottom of the steel furnace top (2), the high-temperature melting and spheroidizing chamber mainly comprises a three-layer structure of an inner-layer heat-resistant lining (15), a middle-layer insulating brick I (6) and an outer-layer steel furnace shell I (4), a whole set of copper cooling wall I (5) is embedded inside the high-temperature melting and spheroidizing chamber, the upper part and the lower part of the high-temperature melting and spheroidizing chamber (16) are respectively provided with an inert/reducing gas outlet (18) and an inert/reducing gas inlet (14) which are uniformly distributed along the circumferential radial direction, and steel baffles (3) are arranged;
the inner wall of the forming cooling chamber (8) is a steel lining (7), the middle layer is a second insulating brick (13), the outer layer is a second steel furnace shell (11), and the bottom of the forming cooling chamber is provided with a product discharge hole (9).
2. The apparatus for producing spherical metal powder for 3D printing according to claim 1, wherein the high temperature melting and spheroidizing chamber (16) has a height of more than 1.5m, and is of a top-down gradually expanding furnace type, and the inner wall thereof has an angle of 80 to 86 degrees with the horizontal direction.
3. The apparatus for producing spherical metal powder for 3D printing according to claim 1, wherein the height of the forming cooling chamber (8) is more than 1.0m, a furnace type is adopted which is tapered from top to bottom, the angle between the upper inner wall and the horizontal direction is 85 °, the angle between the lower inner wall and the horizontal direction is 33 °, and a product discharge port (9) and a discharge valve (10) are provided at the bottom; and a second cooling wall (12) at the lower part of the forming cooling chamber (8) adopts circulating cooling water as a cooling medium.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109877330A (en) * | 2019-03-20 | 2019-06-14 | 北京科技大学 | A kind of device and application method producing 3D printing spherical metal powder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109877330A (en) * | 2019-03-20 | 2019-06-14 | 北京科技大学 | A kind of device and application method producing 3D printing spherical metal powder |
| CN109877330B (en) * | 2019-03-20 | 2023-09-05 | 北京科技大学 | Device for producing spherical metal powder for 3D printing and use method |
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