CN110788338A - Drum-type low-melting-point metal powder spheroidizing device and process - Google Patents
Drum-type low-melting-point metal powder spheroidizing device and process Download PDFInfo
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- CN110788338A CN110788338A CN201911177935.6A CN201911177935A CN110788338A CN 110788338 A CN110788338 A CN 110788338A CN 201911177935 A CN201911177935 A CN 201911177935A CN 110788338 A CN110788338 A CN 110788338A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Abstract
The invention discloses a roller type low-melting-point metal powder spheroidizing device which comprises a bottom plate, wherein a transmission shaft is rotatably arranged at the center inside a heat-insulating cylinder through a high-temperature-resistant support bearing, the bottom of an inclined support plate is fixedly connected with a variable-frequency motor, a roller is fixedly connected onto the transmission shaft, a lining ceramic sleeve is arranged on the inner wall of the roller, a vacuumizing connecting pipe and a feeding hole are arranged at the upper part of one end of the roller, a discharging pipe is communicated with the lower part of the side surface of the other end of the roller, and a heating assembly and a temperature sensing element which hermetically penetrate through the inner wall of the heat-insulating cylinder. The invention can rapidly heat up and spheroidize the metal powder, has simple structure, relatively small argon consumption and uniform texture after the spheroidization of the metal powder; because of the design of the lining ceramic sleeve, the sticking can not occur in the spheroidizing process, and the spheroidizing device is particularly suitable for the spheroidizing of metal powder with low melting point and is convenient to operate and use.
Description
Technical Field
The invention belongs to the technical field of metal powder spheroidization, and particularly relates to a roller type low-melting-point metal powder spheroidizing device; in particular, the invention also relates to a spheroidizing process of the roller type low-melting-point metal powder.
Background
At present, the preparation process of metal powder mainly adopts an atomization method, wherein the atomization method is divided into two types of water atomization and gas atomization, wherein the argon atomization method is adopted to move metal powder with higher quality, such as: patents with publication numbers EP0400659a1 and CN2855596 disclose methods and apparatuses for pulverization by argon atomization, which have high yield and fine powder yield, but consume a large amount of gas (such as Ar), have high production cost, and cannot prepare high-melting-point metal or alloy powder such as W, Mo, Ta, and Nb; in order to solve the preparation of refractory metal spherical powder, a plasma spheroidizing method is invented, for example, the patent with the publication number of US005707419A adopts 3 or more plasma guns, metal wires or powder are sent to a plasma flame flow intersection point after being placed at a specific angle, and high-speed plasma jet is utilized to realize atomization powder preparation; however, because the flame flow intersection point is far away from the electric arc root, and the plasma temperature is low, the method is only suitable for preparing the powder of the metal or the alloy with low melting point, and the powder of the refractory metal and the alloy thereof cannot be prepared; the patent of US7318363B2, publication number, further improves the rf plasma spheroidizing method, and by providing a helical guide vane in the powder feeding pipe, the powder can be fed into a region of higher temperature of the rf plasma, which improves the spheroidizing efficiency of the powder, but the rf plasma has lower energy conversion efficiency and higher hardware cost, and a higher threshold is set for industrial application.
In summary, there are many kinds of preparation processes of metal spherical powder, which have their own advantages and disadvantages, and these methods have no advantages in preparing low-melting-point nonferrous metal spherical powder, for example, because of the high viscosity of copper alloy, the powder prepared by gas atomization method is easy to stick to the inner wall of cooling tower, and plasma spheroidization is suitable for high-melting-point metal.
Disclosure of Invention
The invention aims to provide a roller type low-melting-point metal powder spheroidizing device and a roller type low-melting-point metal powder spheroidizing process, which are used for solving the problems that the spheroidizing cost of metal powder is higher, the argon consumption is high, and the low-melting-point non-ferrous metal spherical powder is easy to stick and is not suitable in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a roller type low-melting-point metal powder spheroidizing device comprises a bottom plate, wherein an inclined supporting plate is fixedly connected to the surface of the upper part of the bottom plate through supporting legs, a heat-insulating cylinder is fixedly connected to the upper part of the inclined supporting plate through a supporting frame, a transmission shaft is rotatably installed at the inner center of the heat-insulating cylinder through a high-temperature-resistant supporting bearing, a driven belt pulley is fixedly installed at one end of the transmission shaft, a variable frequency motor is fixedly connected to the bottom of the inclined supporting plate, a driving belt pulley is fixedly installed at one end of an output shaft of the variable frequency motor and is in transmission connection with the driven belt pulley through a belt, a roller is fixedly connected to the transmission shaft, a lining ceramic sleeve is arranged on the inner wall of the roller, a vacuumizing connecting pipe and a feeding port are arranged at the upper part of one end of the roller, a discharging pipe is communicated with the, and a PLC (programmable logic controller) is fixedly installed on one side of the inclined supporting plate.
Preferably, the temperature sensing element is a thermocouple or a temperature sensor, and a signal output end of the temperature sensing element is connected with a signal input end of the PLC controller.
Preferably, the heating assembly is arranged as an electric heating wire, the electric control end of the heating assembly is electrically connected with the control output end of the PLC, and the control output end of the PLC is further connected with the control end of the variable frequency motor.
Preferably, the vacuumizing connecting pipe is provided with a first manual valve, the discharging pipe is provided with a second manual valve, and the feeding hole is provided with a feeding hole sealing cover.
Preferably, an inlet is formed in one end of the upper portion of the heat-insulating cylinder, an inlet heat-insulating plug cover is installed on the inlet through threads, an outlet is formed in the lower portion of the side face of one end of the heat-insulating cylinder, and an outlet heat-insulating plug cover is installed on the outlet through threads.
Preferably, one side of the lower end of the inclined supporting plate is fixedly connected with a discharge chute.
Preferably, a asbestos fiber cloth heat-insulating layer is further arranged between the inner wall of the heat-insulating cylinder and the heating assembly.
The invention also provides a spheroidizing process of the roller type low-melting-point metal powder, which specifically comprises the following steps:
s1, adjustment: the variable frequency motor is operated to rotate, so that the vacuumizing connecting pipe and the feeding hole are aligned with the inlet, and the discharging pipe is aligned with the outlet; turning off a power supply of the variable frequency motor;
s2, vacuumizing and injecting argon: putting powder to be spheroidized into the feed inlet from the feed inlet, plugging the feed inlet by using a feed inlet sealing plug cover in a sealing way, communicating the feed inlet with a vacuumizing connecting pipe through a flexible connecting pipe of a vacuumizing pump, opening a first manual valve, and vacuumizing; after the vacuumizing is finished, closing the first manual valve, then replacing and connecting a hose of the vacuumizing pump with an argon injection pipe, opening the first manual valve, and injecting argon; after the argon injection is finished, closing the first manual valve, and then removing the argon injection pipe;
s3, starting spheroidizing: plugging the inlet through an inlet heat-insulating plug cover, starting a heating assembly and a variable frequency motor to heat and rotate a roller for spheroidizing;
s4, discharging: after the spheroidization is finished, stopping heating the assembly, keeping low-speed rotation until the temperature is lower than 100 ℃, opening an outlet, reducing the rotating speed of a variable frequency motor, adjusting a discharge pipe to be aligned with the position of the outlet, stopping the machine, and then opening a second manual valve for discharging;
s5, screening: after the discharging is finished, the powder is screened, the required particle size is reserved, and the spheroidizing production of the low-melting-point metal powder is finished.
Preferably, in the spheroidizing process, the rotating speed of the roller is set to be 300-320/min; the temperature of the roller is raised to 645-.
The invention has the technical effects and advantages that: compared with the prior art, the roller type low-melting-point metal powder spheroidizing device and the process have the following advantages that:
1. the invention utilizes the design of the roller and the heat-insulating cylinder, can quickly heat up and carry out metal powder spheroidization, has simple structure, relatively small argon consumption and uniform texture after the metal powder spheroidization;
2. because of the design of the lining ceramic sleeve, the invention can not generate adhesion in the spheroidization process, is especially suitable for the spheroidization of metal powder with low melting point, and has convenient operation and use.
Drawings
FIG. 1 is a schematic structural view of a roller type low melting point metal powder spheroidizing apparatus according to the present invention;
FIG. 2 is a schematic view of the internal structure of the heat-insulating cylinder of the present invention.
In the figure: 1. a variable frequency motor; 2. a drive pulley; 3. a belt; 4. a driven pulley; 5. a drive shaft; 6. a heat-preserving cylinder; 7. a drum; 8. a discharge chute; 9. a support frame; 10. an inclined support plate; 11. a base plate; 12. supporting legs; 13. an inlet heat-insulating plug cover; 14. an inlet; 15. an outlet; 16. an outlet heat-insulating plug cover; 17. a PLC controller; 18. vacuumizing a connecting pipe; 19. a first manual valve; 20. a feed inlet; 21. a feed port sealing plug cover; 22. a high temperature resistant support bearing; 23. a heating assembly; 24. a asbestos fiber cloth heat-insulating layer; 25. a temperature sensing element; 26. lining with a ceramic sleeve; 27. a second manual valve; 28. and (4) discharging the pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a roller type low-melting-point metal powder spheroidizing device as shown in figures 1-2, which comprises a bottom plate 11, wherein the upper surface of the bottom plate 11 is fixedly connected with an inclined supporting plate 10 through a supporting leg 12, the upper part of the inclined supporting plate 10 is fixedly connected with a heat-insulating cylinder 6 through a supporting frame 9, the inner center of the heat-insulating cylinder 6 is rotatably provided with a transmission shaft 5 through a high-temperature-resistant supporting bearing 22, one end of the transmission shaft 5 is fixedly provided with a driven pulley 4, the bottom of the inclined supporting plate 10 is fixedly connected with a variable-frequency motor 1, one end of an output shaft of the variable-frequency motor 1 is fixedly provided with a driving pulley 2, the driving pulley 2 is in transmission connection with the driven pulley 4 through a belt 3, the transmission shaft 5 is fixedly connected with a roller 7, the inner wall of the, the lining ceramic cover 26 is made of alumina corundum, and is beneficial to heat conduction and can ensure that metal powder cannot be bonded with the roller 7), the vacuumizing connecting pipe 18 and the feeding hole 20 are arranged on the upper portion of one end of the roller 7, the lower portion of the side face of the other end of the roller 7 is communicated with the discharging pipe 28, the heating assembly 23 and the temperature sensing element 25 which penetrate through the inner wall of the heat-insulating cylinder 6 in a sealing mode are fixedly mounted on the inner wall of the heat-insulating cylinder 6, and the PLC 17 is fixedly mounted on one side of the inclined supporting plate 10.
The temperature sensing element 25 is a thermocouple or a temperature sensor, and a signal output end of the temperature sensing element 25 is connected with a signal input end of the PLC 17. Heating element 23 sets up to electric heating wire, heating element 23's automatically controlled end and PLC controller 17's control output electric connection, and PLC controller 17's control output still with inverter motor 1 (when implementing, still be provided with the speed reducer in inverter motor 1's one end, the accurate rotational speed regulation of being convenient for) the control end is connected. The vacuumizing connecting pipe 18 is provided with a first manual valve 19, the discharging pipe 28 is provided with a second manual valve 27, and the feeding hole 20 is provided with a feeding hole sealing cover 21. An inlet 14 is formed in one end of the upper portion of the heat-insulating cylinder 6, an inlet heat-insulating plug cover 13 is installed on the inlet 14 through threads, an outlet 15 is formed in the lower portion of the side face of one end of the heat-insulating cylinder 6, and an outlet heat-insulating plug cover 16 is installed on the outlet 15 through threads. One side of the lower end of the inclined supporting plate 10 is fixedly connected with a discharging groove 8. And a asbestos fiber cloth heat-insulating layer 24 is also arranged between the inner wall of the heat-insulating cylinder 6 and the heating component 23.
The invention relates to a spheroidizing process of drum-type low-melting-point metal powder, which specifically comprises the following steps:
s1, adjustment: the variable frequency motor 1 is operated to rotate, so that the vacuumizing connecting pipe 18 and the feeding hole 20 are aligned with the inlet 14, and the discharging pipe 28 is aligned with the outlet 15; turning off the power supply of the variable frequency motor 1;
s2, vacuumizing and injecting argon: putting powder to be spheroidized into the feeding hole 20, sealing and blocking the feeding hole 20 by using a feeding hole sealing and blocking cover 21, communicating the feeding hole with a vacuumizing connecting pipe 18 through a flexible connecting pipe of a vacuumizing pump, opening a first manual valve 19 and vacuumizing; after the vacuumizing is finished, closing the first manual valve 19, then replacing and connecting a hose of the vacuumizing pump with an argon injection pipe, opening the first manual valve 19, and injecting argon; after the argon injection is finished, the first manual valve 19 is closed, and then the argon injection pipe is removed;
s3, starting spheroidizing: the inlet 14 is blocked by the inlet heat-insulating blocking cover 13, and the heating component 23 and the variable frequency motor 1 are started to heat and rotate the roller 7 for spheroidizing;
s4, discharging: after the spheroidization is finished, stopping heating the assembly 23, keeping the low-speed rotation until the temperature is lower than 100 ℃, opening the outlet 15, reducing the rotating speed of the variable frequency motor 1, adjusting the discharge pipe 28 to be aligned with the outlet 15, stopping the machine, and then opening the second manual valve 27 to discharge;
s5, screening: after the discharging is finished, the powder is screened, the required particle size is reserved, and the spheroidizing production of the low-melting-point metal powder is finished. In the spheroidizing process, the rotating speed of the roller 7 is set to 300-; the temperature of the roller 7 is raised to 645 plus 655 ℃, the roller is rolled for 90-100min, then the rotating speed of the roller 7 is reduced to 120 plus 150r/min, the roller is rotated for 90-100min, and the rotating speed of the low-speed rotation in the cooling process is set to be 80-120r/min after the spheroidization is finished.
The non-spherical metal powder is heated in the roller 7 and the roller 7 rotates under the action of centrifugal force, the edges and corners of the non-spherical powder are preferentially subjected to plastic deformation under the action of plastic deformation temperature, rolling friction force and centrifugal force, and the non-regular metal powder is gradually spheroidized along with a rolling machine. The heating temperature is the plastic deformation temperature of the required metal powder, the roller time is influenced by the powder and the metal material, and the roller time is determined according to the spheroidization requirement. Firstly, plastic deformation and gradual rounding are carried out, along with the rolling speed, the rolling speed also influences the spheroidization speed and the sphericity of the powder, the roller speed can be higher when the powder is just played, and the later speed is reduced. The diameter of the roller 7 is not too large in consideration of the need of heating and heat preservation of the roller, the diameter of the roller is selected within the range of 150-300mm, and the length of the roller is 80-100 mm.
The specific implementation example is as follows: 2kg of non-spherical copper alloy powder is filled into a roller 7, the roller is vacuumized, argon is added, the roller is filled with gas, a variable frequency motor 1 is started, and the rotating speed of the roller 7 is set to 300 revolutions per minute; heating the roller 7 to 650 ℃, rolling for 1.5 hours, reducing the rotating speed of the roller 7 to 150 revolutions per minute, and rotating for 2 hours; subsequently, the heating unit 23 is switched off, the temperature is maintained at 150 rpm, the temperature is lower than 100 ℃, the powder is discharged, and the powder is sieved out of the desired particle size range.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (9)
1. A roller type low melting point metal powder spheroidizing device comprises a bottom plate (11), and is characterized in that: the upper surface of the bottom plate (11) is fixedly connected with an inclined supporting plate (10) through supporting legs (12), the upper part of the inclined supporting plate (10) is fixedly connected with a heat-insulating cylinder (6) through a supporting frame (9), the inner center of the heat-insulating cylinder (6) is rotatably provided with a transmission shaft (5) through a high-temperature-resistant supporting bearing (22), one end of the transmission shaft (5) is fixedly provided with a driven pulley (4), the bottom of the inclined supporting plate (10) is fixedly connected with a variable-frequency motor (1), one end of an output shaft of the variable-frequency motor (1) is fixedly provided with a driving pulley (2), the driving pulley (2) is in transmission connection with the driven pulley (4) through a belt (3), the transmission shaft (5) is fixedly connected with a roller (7), the inner wall of the roller (7) is provided with an inner lining ceramic sleeve (26), and one end upper part of the roller (7), and the lower part of the side surface of the other end of the roller (7) is communicated with a discharge pipe (28), a heating component (23) and a temperature sensing element (25) which hermetically penetrate through the inner wall of the heat-insulating cylinder (6) are fixedly installed on the inner wall of the heat-insulating cylinder (6), and a PLC (programmable logic controller) is fixedly installed on one side of the inclined supporting plate (10).
2. A roller type low melting point metal powder spheroidizing apparatus according to claim 1, wherein: the temperature sensing element (25) is arranged as a thermocouple or a temperature sensor, and the signal output end of the temperature sensing element (25) is connected with the signal input end of the PLC (17).
3. A roller type low melting point metal powder spheroidizing apparatus according to claim 1, wherein: heating element (23) set up to electric heating wire, the automatically controlled end of heating element (23) and the control output electric connection of PLC controller (17), and the control output of PLC controller (17) still is connected with the control end of inverter motor (1).
4. A roller type low melting point metal powder spheroidizing apparatus according to claim 1, wherein: be provided with first manual valve (19) on evacuation connecting pipe (18), be provided with second manual valve (27) on discharging pipe (28), install feed inlet sealing plug (21) on feed inlet (20).
5. A roller type low melting point metal powder spheroidizing apparatus according to claim 1, wherein: the upper portion one end of a heat preservation section of thick bamboo (6) is provided with import (14), import heat preservation blanking cover (13) are installed to the screw thread on import (14), the one end side lower part of a heat preservation section of thick bamboo (6) is provided with export (15), export heat preservation blanking cover (16) are installed to the screw thread on export (15).
6. A roller type low melting point metal powder spheroidizing apparatus according to claim 1, wherein: one side of the lower end of the inclined supporting plate (10) is fixedly connected with a discharge chute (8).
7. A roller type low melting point metal powder spheroidizing apparatus according to claim 1, wherein: and a asbestos fiber cloth heat-insulating layer (24) is also arranged between the inner wall of the heat-insulating cylinder (6) and the heating component (23).
8. A spheroidization process of the roller type low melting point metal powder as claimed in claim 1, characterized by comprising the following steps:
s1, adjustment: the variable frequency motor is operated to rotate, so that the vacuumizing connecting pipe and the feeding hole are aligned with the inlet, and the discharging pipe is aligned with the outlet; turning off a power supply of the variable frequency motor;
s2, vacuumizing and injecting argon: putting powder to be spheroidized into the feed inlet from the feed inlet, plugging the feed inlet by using a feed inlet sealing plug cover in a sealing way, communicating the feed inlet with a vacuumizing connecting pipe through a flexible connecting pipe of a vacuumizing pump, opening a first manual valve, and vacuumizing; after the vacuumizing is finished, closing the first manual valve, then replacing and connecting a hose of the vacuumizing pump with an argon injection pipe, opening the first manual valve, and injecting argon; after the argon injection is finished, closing the first manual valve, and then removing the argon injection pipe;
s3, starting spheroidizing: plugging the inlet through an inlet heat-insulating plug cover, starting a heating assembly and a variable frequency motor to heat and rotate a roller for spheroidizing;
s4, discharging: after the spheroidization is finished, stopping heating the assembly, keeping low-speed rotation until the temperature is lower than 100 ℃, opening an outlet, reducing the rotating speed of a variable frequency motor, adjusting a discharge pipe to be aligned with the position of the outlet, stopping the machine, and then opening a second manual valve for discharging;
s5, screening: after the discharging is finished, the powder is screened, the required particle size is reserved, and the spheroidizing production of the low-melting-point metal powder is finished.
9. The spheroidization process of the roller-type low melting point metal powder according to claim 8, wherein: in the spheroidizing process, the rotating speed of the roller is set to 300-; the temperature of the roller is raised to 645-.
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| CN201911177935.6A CN110788338A (en) | 2019-11-27 | 2019-11-27 | Drum-type low-melting-point metal powder spheroidizing device and process |
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| CN201911177935.6A CN110788338A (en) | 2019-11-27 | 2019-11-27 | Drum-type low-melting-point metal powder spheroidizing device and process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113618058A (en) * | 2021-08-11 | 2021-11-09 | 浙江工业大学 | Method for preparing low-cost spherical metal powder by self-shaping |
| CN115351273A (en) * | 2022-08-22 | 2022-11-18 | 广东电网有限责任公司 | Powder filler surface treatment device |
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Application publication date: 20200214 |