CN114632703A - Device and method for removing satellite powder in metal powder prepared by gas atomization method - Google Patents
Device and method for removing satellite powder in metal powder prepared by gas atomization method Download PDFInfo
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- 239000002184 metal Substances 0.000 title claims abstract description 147
- 238000000034 method Methods 0.000 title claims abstract description 54
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- 238000012216 screening Methods 0.000 claims abstract description 71
- 238000000227 grinding Methods 0.000 claims description 28
- 239000002245 particle Substances 0.000 claims description 23
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 16
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B15/00—Combinations of apparatus for separating solids from solids by dry methods applicable to bulk material, e.g. loose articles fit to be handled like bulk material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C7/00—Separating solids from solids by electrostatic effect
- B03C7/02—Separators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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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
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses a device and a method for removing satellite powder in metal powder prepared by a gas atomization method, wherein the device comprises an electrostatic screening shell, the top of the electrostatic screening shell is communicated with a powder inlet pipeline, the side wall of the electrostatic screening shell is provided with a vacuumizing interface and an inflating interface, a screening net rack and a vibrating motor are arranged below a powder outlet of the powder inlet pipeline, the screening net rack is divided into an upper cavity chamber and a lower cavity chamber by a screen, the bottoms of the two cavity chambers are respectively provided with a powder outlet, a coarse powder and fine powder collecting tank is respectively arranged below the powder outlet, and a corona electrode is arranged between the powder outlet of the powder inlet pipeline and the screening net rack in the shell; the method sets reasonable parameters based on the device and adopts two stages to carry out post-treatment on the metal powder prepared by the gas atomization method. The method can effectively remove the ultrafine powder adhered to the surface of the metal powder, thereby greatly reducing the proportion of the satellite powder, improving the plasticity and fatigue property of a powder metallurgy product while improving the fluidity and apparent density of the metal powder, and being beneficial to improving the appearance of an alloy impact fracture.
Description
Technical Field
The invention belongs to the technical field of metal powder post-treatment, and particularly relates to a device and a method for removing satellite powder in metal powder prepared by an atomization method.
Background
Metal powder is almost applied to all industries of national economy, and is the basis for reforming and promoting the development of new industries such as paint coatings, information recording media, fine ceramics, electronic technology, new materials, powder metallurgy, 3D printing, biotechnology and the like.
At present, methods for preparing metal powder mainly include a ball milling method, a jet milling method, a plasma rotating electrode method, a physicochemical method and an air atomization method. The preparation of metal powder by gas atomization is that liquid metal flow is smashed into small liquid drops by utilizing high-speed airflow, and then the small liquid drops are quickly condensed to obtain formed powder. The gas atomization technology has become the most important method for preparing fine spherical metal and alloy powder, and statistically, the gas atomization method produces metal powder which reaches 80 percent of the total production of powder in the world. However, in the forming process of the metal powder, the high-pressure gas participates in the whole process of powder crushing and forming, so that most of the metal powder obtained after gas atomization contains satellite powder (as shown in fig. 2), and the satellite powder refers to aggregated particles formed by adhering a plurality of ultrafine metal powders on the surfaces of large-size (coarse metal powder) particles.
In the prior art, the gas atomization powder containing the satellite powder is used after being pulverized and screened, and the conventional screening equipment and screening process cannot separate the satellite powder, so that the satellite powder contained in the metal powder prepared by the gas atomization method in the market is extremely high in proportion. The existence of the satellite powder has no influence on the compactness of the alloy prepared by the powder metallurgy method, but the existence of the superfine metal powder on the satellite powder can influence the performance of a powder metallurgy product. The reason is that on one hand, the superfine metal powder has large specific surface area, can adsorb a large amount of gas, has extremely high cooling speed, has a large amount of unstable carbides partially gathered on the surface of the powder, and can generate PPB in the hot isostatic pressing process, thereby influencing the plasticity of a powder finished piece, and on the other hand, the superfine metal powder is not easy to deform in the hot isostatic pressing process, is mainly connected with other powder particles by element diffusion, has weak binding force, and can influence the impact property and the fatigue property of the powder finished piece. Namely, because a large amount of satellite powder exists in the metal powder, the metal powder has poor flowability and loose packing density, and poor plasticity and fatigue performance, the appearance of an alloy impact fracture is poor, so that the application of the metal powder prepared by an air atomization method in the field of high-end powder metallurgy parts is limited.
In view of the above, the present invention provides an apparatus and a method for removing satellite powder from metal powder prepared by gas atomization method, so as to overcome the defects of the prior art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a device and a method for removing satellite powder from metal powder prepared by an air atomization method, which can effectively remove superfine metal powder adhered to the surface of the metal powder prepared by the air atomization method, thereby greatly reducing the proportion of the satellite powder in the metal powder, improving the fluidity and loose packing density of the metal powder, improving the plasticity and fatigue property of a powder metallurgy part, being beneficial to improving the appearance of an alloy impact fracture and enabling the alloy impact fracture to be a raw material of a high-end powder metallurgy part.
The purpose of the invention is solved by the following technical scheme:
a device for removing satellite powder in metal powder prepared by an air atomization method comprises an electrostatic screening shell, wherein a powder inlet pipeline is communicated with one side of the top of the electrostatic screening shell, one end of the powder inlet pipeline, which extends into the electrostatic screening shell, is obliquely arranged, a combined screening net rack is arranged below a powder outlet of the powder inlet pipeline, the bottom of the combined screening net rack is connected with a vibrating motor, the combined screening net rack is divided into an upper chamber and a lower chamber through a screen positioned in the middle, an upper powder outlet and a lower powder outlet are respectively formed in the opposite sides of the bottoms of the upper chamber and the lower chamber, and a coarse powder collecting tank and a fine powder collecting tank are respectively and correspondingly arranged below the upper powder outlet and the lower powder outlet and are communicated through hoses;
a corona electrode is arranged in the electrostatic screening shell and between a powder outlet of the powder inlet pipeline and the combined screening net rack;
and the electrostatic screening shell is provided with a vacuumizing interface and an inflating interface.
Furthermore, the part of the screen extending out of the combined screening net rack is connected with an ultrasonic transducer.
Furthermore, the combined screening net rack and the screen are made of rubber, and the aperture of a single grid in the screen is set to be 15-45 microns.
Further, the powder inlet pipeline is formed by communicating a vertical section and an inclined section, and the included angle alpha range of the inclined section and the vertical section is set to be 50-70 degrees.
Further, the inner bottom surface of the lower cavity is conical.
A method for removing satellite powder in metal powder prepared by an air atomization method is based on the device and specifically comprises the following steps:
step one, pre-screening metal powder prepared by an air atomization method by using a rotary vibration screen to obtain primary screened metal powder;
step two, putting the primary screened metal powder obtained in the step one into a V-shaped mixer or a conical mixer for mixing and grinding, and adding grinding balls with set sizes during grinding so as to disperse metal powder particles with different particle sizes combined in the primary screened metal powder;
thirdly, the electrostatic screening shell is vacuumized firstly through corresponding external equipment which is respectively connected with the vacuumizing interface and the air charging interface, and when the vacuum degree in the electrostatic screening shell is less than or equal to 1 x 10-2When the pressure is Pa, introducing argon from the gas-filled interface until the pressure in the electrostatic screening shell is more than or equal to 0.03MPa, and stopping introducing the argon;
and step four, introducing the metal powder obtained in the step two into the electrostatic screening shell treated in the step three from a powder inlet pipeline, enabling the metal powder to be endowed with electric charges when the metal powder passes through a corona electrode, then falling onto a screen under the action of gravity, realizing separation of metal powder particles with different particle sizes under the combined action of like-polarity electric charge repulsive force, the vibration force of a vibration motor and an ultrasonic transducer connected with the screen, enabling the metal powder particles larger than or equal to the mesh aperture of the screen to fall into a coarse powder collecting tank through an upper powder outlet, and enabling the metal powder particles smaller than the mesh aperture of the screen to fall into a fine powder collecting tank through a lower powder outlet.
Further, during the mixing and grinding in the second step, the rotating speed of the mixer is set to be 25-35 r/min, the diameter of the grinding ball is set to be 30-40 mm, the ball-material ratio is that 1 grinding ball is put into every 10kg of metal powder, and the mixing time is set to be 4-6 h.
Further, in the fourth step, the voltage of the corona electrode is set to be 50-80 kV.
Furthermore, in the fourth step, the vibration frequency of the vibration motor is set to be 20-40 Hz, and the offset angle is set to be 10-15 degrees; the frequency of the ultrasonic transducer connected with the screen is set to be 50-80 Hz, and the amplitude is set to be 50-60%.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a device and a method for removing satellite powder in metal powder prepared by an air atomization method, the device and the method can effectively remove fine/superfine metal powder adhered to the surface of the metal powder prepared by the air atomization method through a two-stage post-treatment process, the satellite powder removal efficiency is up to more than 88.97 percent through practical verification, and the metal powder after the satellite powder is removed can become a raw material of a high-end powder metallurgy part. Research and analysis show that the superfine metal powder adhered to the surface of the coarse metal powder and the coarse metal powder belong to metallurgical bonding, have certain bonding strength, and can still physically adsorb the coarse metal powder due to adsorption after being dispersed with the coarse metal powder due to large specific surface area of the superfine metal powder. Based on the method, in the first stage of the invention, V-shaped or conical mixing equipment is used for mixing and grinding the metal powder under the condition of adding grinding balls, so that the metal powder particles with different particle sizes, which are metallurgically bonded, in the metal powder are fully dispersed (separated from each other); the second stage uses the electrostatic screening device to screen the metal powder, and the device can give the same kind of electric charge to the metal powder granule, and under the effect of same kind of electric charge, the fine/superfine metal powder that takes place physical adsorption after the dispersion can produce repellent electrostatic force, then takes place the separation with thick metal powder granule itself under the effect of screen cloth, ultrasonic transducer and vibrating motor to play the effect of getting rid of the satellite powder.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of an apparatus for removing satellite powder from metal powder prepared by an atomization method according to the present invention;
FIG. 2 is a graphical representation of the morphology of a metal powder produced by a gas atomization process (example 1 before the process of the present invention is used);
FIG. 3 is a graph of the morphology of the metal powder after the method of the invention was used in example 1.
Wherein: 1 is an electrostatic screening shell; 2 is a powder inlet pipeline; 3 is a combined screening net rack; 4 is a vibration motor; 5 is a screen mesh; 6 is a coarse powder collecting tank; 7 is a fine powder collecting tank; 8 is a corona electrode; 11 is a vacuumizing interface; 12 is an inflation interface; 21 is a vertical section; 22 is an inclined section; 31 is an upper chamber; 32 is a lower chamber; 311 is an upper powder outlet; 321 is a lower powder outlet; 322 is conical; alpha is the included angle between the inclined section and the vertical section.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.
In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1, the present invention provides a device for removing satellite powder from metal powder prepared by gas atomization, comprising an electrostatic screening housing 1, a powder inlet pipe 2 connected to one side of the top of the electrostatic screening housing 1, an inclined end of the powder inlet pipe 2 extending into the electrostatic screening housing 1, a combined screening net rack 3 disposed below the powder outlet of the powder inlet pipe 2, preferably, the combined screening net rack 3 is composed of two screening net racks with the same size connected by a quick connector, the bottom of the combined screening net rack 3 is connected with a vibration motor 4, the combined screening net rack 3 is divided into an upper chamber 31 and a lower chamber 32 by a screen 5 disposed in the middle, the part of the screen 5 extending out of the combined screening net rack 3 is connected with an ultrasonic transducer, the opposite sides of the bottoms of the upper chamber 31 and the lower chamber 32 are respectively provided with an upper powder outlet 311 and a lower powder outlet 321, the lower parts of the upper powder outlet 311 and the lower powder outlet 321 are respectively and correspondingly provided with a coarse powder collecting tank 6 and a fine powder collecting tank 7 which are communicated through hoses. Through the above arrangement, in metal powder falls into combination formula screening rack 3 through the back by the action of gravity from powder inlet pipe way 2, under the vibration combined action of ultrasonic transducer and vibrating motor 4 that screen cloth 5 is connected, make the thick metal powder of diameter more than or equal to screen cloth 5 net aperture in the metal powder granule fall into middlings collection tank 6 after last meal outlet 311, the hose, the fine/superfine metal powder granule that is less than screen cloth 5 net aperture falls into in the fine powder collection tank 6 after powder outlet 321, the hose, thereby realize getting rid of the satellite powder, realize promptly getting rid of the purpose of gluing a plurality of fine/superfine metal powder on relative thick metal powder surface.
The powder inlet pipeline 2 is formed by communicating a vertical section 21 and an inclined section 22, the included angle alpha between the inclined section 22 and the vertical section 21 is set to be 50-70 degrees, the vertical section 21 accelerates the flow of metal powder, and the inclined section 22 enables the metal powder to be dispersed when the metal powder is discharged; in addition, a corona electrode 8 is arranged in the electrostatic screening shell 1 and between the powder outlet of the inclined section 22 and the combined screening net rack 3, and the corona electrode 8 is arranged in a bent shape, so that dispersed metal powder can be endowed with charges before falling into the screening net rack 3, and the like charges among the metal powder generate repulsive force, thereby efficiently realizing the separation of the fine/superfine metal powder and the coarse metal powder.
Preferably, the side wall of the electrostatic screening housing 1 is provided with the vacuumizing port 11 and the air charging port 12, and the vacuumizing port 11 is located above the air charging port 12, so that when the device is used for removing satellite powder, the electrostatic screening housing 1 needs to be in a vacuum state, and a certain pressure is kept in the housing.
Specifically, the combined screening net rack 3 and the screen 5 are made of rubber (because the rubber material is non-conductive, when the corona electrode 8 applies charges to metal powder particles, if the combined screening net rack 3 and the screen 5 are made of metal materials, points can be rapidly placed, and the effect of charge exclusion separation of fine/superfine metal powder cannot be achieved), the diameter setting range of a single grid in the screen 5 is 15-45 μm, and the actual size can be set according to specific conditions; in addition, because the metal powder particles which are sieved by the screen 5 and fall into the lower chamber 32 are relatively small, in order to avoid the metal powder particles from being gathered in the middle of the lower chamber 32, the inner bottom surface of the lower chamber 32 is set to be conical 322, so that the fine/superfine metal powder falling into the lower chamber 32 flows to the outer ring of the lower chamber 32 along the conical surface of the conical 322, and then the vibration of the vibration motor 4 is combined, the vibration motor 4 takes a vertical motor as a vibration source, the rotation motion of the motor is converted into horizontal-vertical-inclined three-dimensional motion through eccentric hammers arranged at the upper end and the lower end, and the fine/superfine metal powder can rapidly enter the fine powder collecting tank 7 for collection after passing through the lower powder outlet 321 and a connecting hose.
The invention also provides a method for removing satellite powder in metal powder prepared by an atomization method based on the device, which comprises the following steps:
step one, pre-screening the metal powder prepared by the gas atomization method by using a rotary vibration screen, and screening out large-particle metal powder to obtain primary screened metal powder.
Step two, putting the primary screened metal powder obtained in the step one into a V-shaped mixer or a conical mixer for mixing and grinding, and adding grinding balls with set sizes during grinding so as to disperse coarse and fine metal powder particles combined in the primary screened metal powder;
specifically, when the primary screened metal powder is mixed and ground, the rotating speed of a mixer is set to be 25-35 r/min, the diameter of a grinding ball is set to be 30-40 mm, the ball-material ratio is 1 grinding ball per 10kg of metal powder, and the mixing time is set to be 4-6 h.
Thirdly, respectively connecting the corresponding external equipment (vacuumizing equipment and argon filling equipment) with a vacuumizing interface 11 and an air filling interface 12, vacuumizing the electrostatic screening shell 1, and when the vacuum degree in the electrostatic screening shell 1 is less than or equal to 1 x 10- 2When Pa is needed, argon is introduced from the gas charging interface 12, the purity of the charged argon is required to be more than or equal to 99.999 percent, and the pressure of the charged argon is more than or equal to 0.03 MPa.
Step four, introducing the metal powder obtained in the step two into the electrostatic screening shell 1 treated in the step three from the powder inlet pipeline 2, enabling the metal powder to be endowed with electric charges when the metal powder passes through the corona electrode 8, then falling onto the screen 5 under the action of gravity, realizing separation of coarse metal powder and fine metal powder under the combined action of like-polarity electric charge repulsive force, the vibration force of the vibration motor 4 and an ultrasonic transducer connected with the screen 5, enabling the coarse metal powder to fall into the coarse powder collecting tank 6 through the upper powder outlet 311, and enabling the fine metal powder to fall into the fine powder collecting tank 7 through the lower powder outlet 321;
specifically, the speed of the metal powder flowing into the electrostatic screening shell 1 from the powder inlet pipeline 2 is 15-30 kg/h, the voltage of the corona electrode 8 is set to be 50-80 kV, the vibration frequency of the vibration motor 4 is set to be 20-40 Hz, and the offset angle is set to be 10-15 degrees; the frequency of the ultrasonic transducer connected with the screen 5 is set to be 50-80 Hz, and the amplitude is set to be 50-60%.
To further verify the efficacy of the present invention, the inventors conducted the following specific examples:
example 1
1) The metal powder produced by the gas atomization process (as shown in figure 2) was pre-sieved using a rotary vibrating sieve to obtain a primary sieved metal powder.
2) Putting the primary screened metal powder obtained in the step 1) into a V-shaped mixer for mixing and grinding, wherein the rotating speed of the mixer is set to be 25r/min, the diameter of a grinding ball is phi 30mm, the ball-material ratio is 1 grinding ball per 10kg, and the mixing time is 4 h.
3) The device is processed, firstly, the vacuum is pumped from the vacuum pumping interface 11, and when the vacuum degree in the device is less than or equal to 1 x 10-2When Pa is needed, argon is introduced from the gas charging interface 12 until the pressure of the device is more than or equal to 0.03MPa, and then the device is stopped.
4) Introducing the metal powder obtained in the step 2) into the device treated in the step 3) from the powder inlet pipeline 2 at a speed of 15kg/h, enabling the metal powder to be charged when passing through a corona electrode 8 with the voltage of 50 kV, then falling onto the screen 5 under the action of gravity, and realizing the separation of coarse metal powder and fine metal powder under the combined action of like-polarity charge repulsive force, the vibration force of the vibration motor 4 and an ultrasonic transducer connected with the screen 5, wherein the vibration frequency of the vibration motor 4 is set to be 20Hz, the offset angle is set to be 10 degrees, the frequency of the ultrasonic transducer is set to be 50Hz, the amplitude is set to be 50 percent, the coarse metal powder falls into the coarse powder collecting tank 6 through the upper powder outlet 311, and the fine metal powder falls into the fine powder collecting tank 7 through the lower powder outlet 321.
The following table 1 shows the satellite powder proportion detection result obtained before the metal powder is screened by the method, and the data in the table can show that the satellite powder in the metal powder can be effectively removed after the two-stage screening post-treatment is carried out by using the method, the satellite powder removal efficiency is up to 88.97 percent, the result is shown in figure 3, and the metal powder particles are mainly spherical and the proportion of the satellite powder is very small; in addition, the satellite powder removing effect can be further improved by increasing the electrostatic screening times, and the repeated description is omitted.
Table 1 shows the ratio of the satellite-removed powder of the present invention to the satellite-contained powder of the metal powder prepared by the conventional gas atomization method:
example 2
1) And pre-screening the metal powder prepared by the gas atomization method by using a rotary vibration screen to obtain primary screened metal powder.
2) Putting the primary screened metal powder obtained in the step 1) into a conical mixer for mixing and grinding, wherein the rotating speed of the mixer is set to be 30r/min, the diameter of a grinding ball is phi 35mm, the ball-material ratio is that 1 grinding ball is put into every 10kg, and the mixing time is 5 h.
3) The device is processed, firstly, the vacuum is pumped from the vacuum pumping interface 11, and when the vacuum degree in the device is less than or equal to 1 x 10-2When Pa is needed, argon is introduced from the gas charging interface 12 until the pressure of the device is more than or equal to 0.03MPa, and then the device is stopped.
4) Introducing the metal powder obtained in the step 2) into the device treated in the step 3) from the powder inlet pipeline 2 at a speed of 20kg/h, enabling the metal powder to be charged when passing through a corona electrode 8 with the pressure of 65kV, then falling onto the screen 5 under the action of gravity, and realizing the separation of coarse metal powder and fine metal powder under the combined action of like charge repulsive force, the vibration force of the vibration motor 4 and an ultrasonic transducer connected with the screen 5, wherein the vibration frequency of the vibration motor 4 is set to be 30Hz, the offset angle is set to be 13 degrees, the frequency of the ultrasonic transducer is set to be 65Hz, the amplitude is set to be 55 percent, the coarse metal powder falls into the coarse powder collecting tank 6 through the upper powder outlet 311, and the fine metal powder falls into the fine powder collecting tank 7 through the lower powder outlet 321.
Example 3
1) And pre-screening the metal powder prepared by the gas atomization method by using a rotary vibration screen to obtain primary screened metal powder.
2) Putting the primary screened metal powder obtained in the step 1) into a V-shaped mixer for mixing and grinding, wherein the rotating speed of the mixer is set to be 35r/min, the diameter of a grinding ball is phi 40mm, the ball-material ratio is 1 grinding ball per 10kg, and the mixing time is 6 h.
3) The device is processed, firstly, the vacuum is pumped from the vacuum pumping interface 11, and when the vacuum degree in the device is less than or equal to 1 x 10-2When Pa is needed, argon is introduced from the gas charging interface 12 until the pressure of the device is more than or equal to 0.03MPa, and then the device is stopped.
4) Introducing the metal powder obtained in the step 2) into the device treated in the step 3) from the powder inlet pipeline 2 at the speed of 30kg/h, enabling the metal powder to be charged when passing through a corona electrode 8 with the voltage of 80kV, then falling onto the screen 5 under the action of gravity, and realizing the separation of coarse metal powder and fine metal powder under the combined action of like-polarity charge repulsive force, the vibration force of the vibration motor 4 and an ultrasonic transducer connected with the screen 5, wherein the vibration frequency of the vibration motor 4 is set to be 40Hz, the offset angle is set to be 15 degrees, the frequency of the ultrasonic transducer is set to be 80Hz, the amplitude is set to be 60 percent, the coarse metal powder falls into the coarse powder collecting tank 6 through the upper powder outlet 311, and the fine metal powder falls into the fine powder collecting tank 7 through the lower powder outlet 321.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
It is to be understood that the present invention is not limited to what has been described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. The utility model provides a get rid of device of satellite powder among metal powder of gas atomization preparation, includes electrostatic screening casing (1), its characterized in that, electrostatic screening casing (1) top one side intercommunication has into powder pipeline (2), it is the tilting setting to stretch into the inside one end of electrostatic screening casing (1) in powder pipeline (2), the play powder mouth below of advancing powder pipeline (2) is provided with combination formula screening rack (3), the bottom of combination formula screening rack (3) is connected with vibrating motor (4), combination formula screening rack (3) is separated it for last cavity (31) and lower cavity (32) through screen cloth (5) that are located the middle part, go up powder mouth (311) and lower powder mouth (321) have been seted up respectively to the relative one side in bottom of going up cavity (31) and lower cavity (32), the below of going up powder mouth (311) and lower powder mouth (321) corresponds respectively and is provided with middlings collection jar (6) and farine collection jar (7), and are communicated through hoses;
wherein, a corona electrode (8) is arranged in the electrostatic screening shell (1) and between the powder outlet of the powder inlet pipeline (2) and the combined screening net rack (3);
the electrostatic screening shell (1) is provided with a vacuumizing interface (11) and an inflating interface (12).
2. The device for removing the satellite powder in the metal powder prepared by the gas atomization method according to claim 1, wherein the part of the screen (5) extending out of the combined screening net rack (3) is connected with an ultrasonic transducer.
3. The device for removing satellite powder from metal powder prepared by the gas atomization method according to claim 1 or 2, wherein the combined screening net rack (3) and the screen (5) are made of rubber, and the aperture of each grid in the screen (5) is set to be 15-45 μm.
4. The device for removing the satellite powder in the metal powder prepared by the gas atomization method according to the claim 1, characterized in that the powder inlet pipeline (2) is composed of a vertical section (21) and an inclined section (22) which are communicated, and the included angle α between the inclined section (22) and the vertical section (21) is set to be 50-70 °.
5. The apparatus for removing satellite powder from metal powder produced by aerosolization according to claim 1, wherein the bottom surface of the lower chamber (32) is conically shaped (322).
6. The method for removing the satellite powder in the metal powder prepared by the gas atomization method is based on the device for removing the satellite powder in the metal powder prepared by the gas atomization method, and is characterized by comprising the following steps:
step one, pre-screening metal powder prepared by an air atomization method by using a rotary vibration screen to obtain primary screened metal powder;
step two, putting the primary screened metal powder obtained in the step one into a V-shaped mixer or a conical mixer for mixing and grinding, and adding grinding balls with set sizes during grinding so as to disperse metal powder particles with different particle sizes combined in the primary screened metal powder;
thirdly, the electrostatic screening shell (1) is vacuumized through connecting corresponding external equipment with the vacuumizing interface (11) and the air charging interface (12) respectively, and when the vacuum degree in the electrostatic screening shell (1) is less than or equal to 1 x 10-2When Pa is reached, argon is introduced from the gas charging interface (12) until the pressure in the electrostatic screening shell (1) is more than or equal to 0.03MPa, and the introduction of argon is stopped;
and step four, introducing the metal powder obtained in the step two into the electrostatic screening shell (1) treated in the step three from the powder inlet pipeline (2), enabling the metal powder to be endowed with electric charges when the metal powder passes through the corona electrode (8), then falling onto the screen (5) under the action of gravity, realizing the separation of metal powder particles with different particle sizes under the combined action of like electric charge repulsive force, the vibration force of the vibration motor (4) and an ultrasonic transducer connected with the screen (5), enabling the metal powder particles larger than or equal to the mesh aperture of the screen (5) to fall into the coarse powder collecting tank (6) through the upper powder outlet (311), and enabling the metal powder particles smaller than the mesh aperture of the screen (5) to fall into the fine powder collecting tank (7) through the lower powder outlet (321).
7. The method for removing satellite powder from metal powder prepared by gas atomization according to claim 6, wherein the mixing and grinding in step two are carried out at a mixer rotation speed of 25-35 r/min and a grinding ball diameter of 30-40 mm, the feeding ratio is 1 grinding ball per 10kg metal powder, and the mixing time is 4-6 h.
8. The method for removing the satellite powder in the metal powder prepared by the gas atomization method according to claim 6, wherein in the fourth step, the speed of the metal powder flowing into the electrostatic screening shell (1) from the powder inlet pipeline (2) is 15-30 kg/h.
9. The method for removing satellite powder in metal powder prepared by gas atomization according to claim 6, wherein in the fourth step, the voltage of the corona electrode (8) is set to 50-80 kV.
10. The method for removing satellite powder from metal powder prepared by the gas atomization method according to claim 6, wherein in the fourth step, the vibration frequency of the vibration motor (4) is set to be 20-40 Hz, and the offset angle is set to be 10-15 °; the frequency of the ultrasonic transducer connected with the screen (5) is set to be 50-80 Hz, and the amplitude is set to be 50-60%.
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