CN110233042B - Manufacturing process of neodymium iron boron magnet - Google Patents

Manufacturing process of neodymium iron boron magnet Download PDF

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Publication number
CN110233042B
CN110233042B CN201910486278.7A CN201910486278A CN110233042B CN 110233042 B CN110233042 B CN 110233042B CN 201910486278 A CN201910486278 A CN 201910486278A CN 110233042 B CN110233042 B CN 110233042B
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Prior art keywords
plate
magnetic powder
sieve
powder
drives
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CN201910486278.7A
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CN110233042A (en
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周晓庆
鲍黄平
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Zhejiang Sheensen Magnetics Technology Co ltd
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Zhejiang Sheensen Magnetics Technology Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/90Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms 
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING 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
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B07B1/34Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens jigging or moving to-and-fro perpendicularly or approximately perpendiculary to the plane of the screen
    • B07B1/343Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens jigging or moving to-and-fro perpendicularly or approximately perpendiculary to the plane of the screen with mechanical drive elements other than electromagnets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING 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
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/42Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING 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
    • B07B1/00Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46Constructional details of screens in general; Cleaning or heating of screens
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02Compacting only
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10Sintering only
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24After-treatment of workpieces or articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00Making metallic powder or suspensions thereof
    • B22F9/02Making metallic powder or suspensions thereof using physical processes
    • B22F9/04Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • H01F41/026Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets protecting methods against environmental influences, e.g. oxygen, by surface treatment
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • H01F41/0266Moulding; Pressing

Abstract

The invention discloses a process for manufacturing a neodymium iron boron magnet, which comprises the following steps: a. smelting: charging, vacuumizing to below 1Pa, starting to heat at low power, continuously exhausting while heating, gradually desorbing and exhausting adsorbed gas and water along with temperature rise until furnace burden is dark red, closing a valve, filling argon, increasing power, heating until the furnace burden is completely melted, refining for 5 minutes, reducing power after refining, pouring, and cooling after pouring; b. milling: placing neodymium iron boron particles into an airflow mill for high-speed collision so as to form powder under the high-speed collision of the particles, collecting the formed powder, placing the collected powder into a sieving machine for sieving, and removing impurities in the magnetic powder; c. molding; d. sintering; e. and (3) machining: the neodymium iron boron magnets obtained after sintering are all blanks, and need to be further machined to obtain products with different sizes, sizes and shapes; f. surface treatment; g. and (6) inspecting and packaging a finished product.

Description

Manufacturing process of neodymium iron boron magnet
Technical Field
The invention belongs to the technical field of processing of neodymium iron boron magnets, and particularly relates to a manufacturing process of a neodymium iron boron magnet.
Background
Neodymium magnet (Neodymium magnet), also known as Neodymium iron boron magnet (NdFeB magnet), is a tetragonal crystal formed of Neodymium, iron, and boron (Nd 2Fe 14B). In 1982, the neodymium magnet was discovered by a person living in the special metal of Sumitomo. The magnetic energy product (BHmax) of this magnet was greater than that of a samarium cobalt magnet, and was the largest in magnetic energy product worldwide at that time. Later, Sumitomo specialty metals successfully developed powder metallurgy (powder metallurgy) and general automotive successfully developed melt-spinning (melt-spinning) processes that could produce neodymium-iron-boron magnets. This magnet is a permanent magnet that is second only to absolute zero holmium magnets in magnetism today and is also the most commonly used rare earth magnet. Neodymium iron boron magnets are widely used in electronic products such as hard disks, mobile phones, earphones, and battery powered tools.
The neodymium iron boron magnet needs to go through a pulverizing link during manufacturing, a lot of impurities are mixed in the magnetic powder after the magnetic powder is manufactured, the impurities in the magnetic powder need to be removed and the magnetic powder performance needs to be improved, the existing method for removing the impurities of the magnetic powder generally puts the magnetic powder on a vibrating screen and shakes off the magnetic powder, the magnetic powder is magnetic, the magnetic powder can be mutually bonded into one piece, the filtering effect of the magnetic powder is influenced, the sieve pores are easily blocked by the massive magnetic powder, and the service life of the vibrating screen is influenced.
Disclosure of Invention
The invention provides a process for manufacturing a neodymium iron boron magnet, aiming at overcoming the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a neodymium iron boron magnet manufacturing process comprises the following steps:
a. smelting: charging, vacuumizing to below 1Pa, starting to heat at low power, continuously exhausting while heating, gradually desorbing and exhausting adsorbed gas and water along with temperature rise until furnace burden is dark red, closing a valve, filling argon, increasing power, heating until the furnace burden is completely melted, refining for 5 minutes, reducing power after refining, pouring, and cooling after pouring;
b. milling: placing neodymium iron boron particles into an airflow mill for high-speed collision so as to form powder under the high-speed collision of the particles, collecting the formed powder, placing the collected powder into a sieving machine for sieving, and removing impurities in the magnetic powder;
c. molding: the method comprises orientation and profiling, wherein the orientation is used for enabling the easy magnetization direction c axis of the disorderly oriented powder particles to rotate to the same direction, so that the maximum remanence is obtained; the main purpose of the pressing is to press the powder into crush with certain shape and size, and simultaneously to keep the degree of grain orientation obtained in the magnetic field orientation as much as possible;
d. and (3) sintering: putting the product into a sintering furnace, and sintering to obtain a blank product;
e. and (3) machining: the neodymium iron boron magnets obtained after sintering are all blanks, and need to be further machined to obtain products with different sizes, sizes and shapes;
f. surface treatment: the surface treatment is carried out on the rare earth permanent magnets in various shapes so as to ensure the appearance and the corrosion resistance of the product;
g. and (3) inspecting and packaging a finished product: various magnetic properties, corrosion resistance, high-temperature properties and the like of the product are detected, and the product is packaged after reaching the standard so as to meet various requirements of customers;
wherein the sieving machine in the step b comprises a barrel body and a box body arranged at the bottom of the barrel body, a material receiving box is arranged in the box body, a first movable groove is arranged on the inner wall of the barrel body, a sieve plate is arranged in the first movable groove, a connecting spring is arranged at the top of the first movable groove, the sieve plate is arranged at the bottom end of the connecting spring, a first connecting plate is arranged in the barrel body, a connecting shaft is arranged at the bottom of the first connecting plate, the side wall of the connecting shaft is provided with a stirring rod, the side wall of the first connecting plate is provided with a connecting rod, one end of the connecting rod is provided with a connecting ring, a second movable groove matched with the connecting ring is arranged on the inner wall of the barrel body, a driving motor for driving the connecting ring to rotate is arranged on the side wall of the barrel body, when the driving motor drives the connecting ring to rotate, the sieve plate moves up and down along the inner wall of the first movable groove; after the magnetic powder is made, the magnetic powder is placed in the barrel body, the magnetic powder is placed on the surface of the sieve plate, the driving motor drives the connecting ring to rotate, the connecting ring drives the first connecting plate to rotate, and the magnetic powder is uniformly stirred when the stirring rod rotates, so that the magnetic powder is dispersed in the box body; the first connecting plate drives the sieve plate to move in the first movable groove when rotating, the sieve plate moves upwards under the elastic force of the connecting spring after moving downwards, the sieve plate is pulled to move upwards quickly, the sieve plate is made to collide with the top of the first movable groove and then shake off the magnetic powder, the magnetic powder is made to fall into the material receiving box from the sieve plate, and impurities in the magnetic powder are removed.
The magnetic powder in the barrel body is stirred and dispersed through the stirring action of the stirring rod on the magnetic powder, the situation that the magnetic powder is combined with each other to form a large block to block a sieve pore is avoided, and the magnetic powder is prevented from wrapping impurities in the middle to influence the filtering effect of the magnetic powder; the sieve plate is driven to move up and down in the first movable groove by the rotation of the stirring rod, so that scattered magnetic powder is shaken off from the sieve holes when the sieve plate vibrates, the magnetic powder falls off from the sieve plate, and the sieve plate is convenient to sieve the magnetic powder; under the effect of coupling spring, make the sieve produce great up-motion's power after down-motion to produce the collision with first movable groove top when making the quick up-motion of sieve, the sieve produces great vibrations under the collision, and the effectual magnetic that shakes on the sieve is scattered, makes the magnetic drop from the sieve, and further promotion is to the filter effect of magnetic.
The temperature of the hydrogen scrap melt of the melt spun belt in the step d is 1050-1085 ℃, the temperature of the hydrogen scrap of the cast ingot is 1070-1095 ℃, and the temperature of the cast ingot is 1100-1135 ℃; the sintering effect is improved by controlling the temperature, and the quality of the finished magnet product is improved.
The step e comprises a cutting operation, namely, a slicing machine is used for processing the wafer and the small and medium square blocks, and a double-sided grinding machine with higher precision or with the CPK requirement is required to be processed; the magnet tangent plane after cutting is polished, promotes magnet tangent plane smoothness, promotes the off-the-shelf pleasing to the eye degree of magnet, is convenient for sell of finished product magnet.
The sintering process of the step d comprises the following steps: feeding, sintering, discharging, demagnetizing and back burning; through the multiple processing to magnet, promote the sintering effect of magnet, increase the finished product quality of magnet.
The surface treatment in the step f comprises electroplating, and the electroplating specifically comprises: zinc plating, nickel plating, electrophoresis, phosphorization, gold plating, and the like; through carrying out surface treatment to magnet, plate the protection film on the magnet surface, avoid magnet and air and moisture to contact and cause the damage to magnet, play the guard action to magnet, prolong the life of magnet.
A second connecting plate is arranged on the inner wall of the barrel body, the second connecting plate is movably connected to the inner wall of the barrel body, a third connecting plate is arranged on the sieve plate, the third connecting plate is movably connected to the sieve plate, one end of the second connecting plate and one end of the third connecting plate are hinged to one point, a first convex block is arranged on the second connecting plate, and a second convex block matched with the first convex block is arranged at the bottom of the stirring rod; after the magnetic powder is placed in the barrel body, the driving motor drives the connecting ring to rotate, so that the connecting ring drives the stirring rod to rotate, the stirring rod is in contact with the magnetic powder and simultaneously drives the second lug to rotate, the second lug is in contact with the first lug to push the first lug to move downwards, the sieve plate shakes with the second lug in a small amplitude and high frequency mode to shake the magnetic powder off the sieve plate, and the magnetic powder is separated from impurities; the first lug is in discontinuous contact with the second lug along with the rotation of the stirring rod, the first lug pushes the second lug to move downwards, the second lug pushes the second connecting plate to move downwards, the second connecting plate pushes the third connecting plate to move downwards, and the third connecting plate pushes the sieve plate to move downwards; when the puddler rotates, push the sieve toward first activity tank bottom below motion under the puddler effect, the sieve motion drives the motion of third connecting plate, make the motion of third connecting plate pulling second connecting plate, second connecting plate and third connecting plate rotate round the tie point, make second connecting plate and third connecting plate play the closure effect to first activity groove, avoid the sieve magnetic to drop to first activity inslot when down moving, be convenient for clear up staving inside, prevent that the magnetic from causing the influence to the motion of sieve.
A cavity is arranged in the box body, a material receiving groove is arranged in the cavity and is arranged below the sieve plate, the material receiving box is arranged on one side of the material receiving groove, a guide rod is arranged in the cavity, an installation plate is arranged at the bottom of the guide rod, an air cylinder is arranged at the top of the installation plate, an air cylinder piston rod is arranged on the installation plate in a penetrating manner, an iron plate is arranged on the air cylinder piston rod, and a scraper plate is arranged above the material receiving box; after magnetic powder falls from the sieve plate, the magnetic powder falls into the material receiving groove, the mounting plate moves along the guide rod to move to the position above the material receiving groove, the air cylinder drives the iron plate to move downwards to make the iron plate contact with the magnetic powder, the magnetic powder is adsorbed at the bottom of the iron plate, the air cylinder drives the iron plate to move to the position where the iron plate contacts with the bottom surface of the mounting plate, the mounting plate moves to the position above the material receiving box along the guide rod, the air cylinder drives the iron plate to move downwards to make the bottom surface of the iron plate contact with the scraper plate, the mounting plate is moved along the guide rod, the scraper plate hangs down the; the magnetic powder is conveyed under the action of the iron plate, and is separated from small particle impurities falling together, so that the screening effect of the magnetic powder is improved, and the impurities in the magnetic powder are effectively removed; under the action of the scraper, magnetic powder at the bottom of the iron plate is effectively scraped, so that the magnetic powder falls into the material receiving box, and the magnetic powder is collected through the material receiving box, so that the magnetic powder after screening is obtained; the mounting panel drives iron plate and removes in the cavity, makes the mounting panel be in the material receiving box top when the magnetic drops from the sieve, avoids the magnetic to drop and causes the inconvenience of magnetic clearance at the mounting panel top, and the mounting panel removes again after the magnetic all drops in connecing the silo, will connect the magnetic transport in the silo to connect in the material receiving box, does further screening to the magnetic, is convenient for collect the magnetic after the screening.
The invention has the following advantages: through the stirring effect of puddler to the magnetic, stir the scattering with the magnetic in the barrel, avoid magnetic inter combination to form the bold together and block up the sieve mesh, prevent that the magnetic from wrapping up impurity in the middle part and influencing the filter effect to the magnetic.
Drawings
Figure 1 is a schematic structural diagram of the sieving machine of the invention.
Figure 2 is a schematic cross-sectional view of the sieving machine of the present invention.
Fig. 3 is an enlarged view of a portion a in fig. 2.
Fig. 4 is an enlarged view of fig. 2 at B.
Fig. 5 is an enlarged view of fig. 2 at C.
Figure 6 is a schematic cross-sectional view of the screening machine of the present invention.
Fig. 7 is an enlarged view of fig. 6 at D.
Fig. 8 is an enlarged view of fig. 6 at E.
Figure 9 is a schematic cross-sectional view of the screen of the present invention showing three.
Fig. 10 is an enlarged view at F in fig. 9.
Fig. 11 is an enlarged view at G in fig. 9.
Figure 12 is a cross-sectional schematic view of the screen of the present invention four.
Figure 13 is a schematic cross-sectional view of a screen according to the present invention.
Fig. 14 is an enlarged view of fig. 13 at H.
Detailed Description
Example 1:
a neodymium iron boron magnet manufacturing process comprises the following steps: a. smelting: charging, vacuumizing to below 1Pa, starting to heat at low power, continuously exhausting while heating, gradually desorbing and exhausting adsorbed gas and water along with temperature rise until furnace burden is dark red, closing a valve, filling argon, increasing power, heating until the furnace burden is completely melted, refining for 5 minutes, reducing power after refining, pouring, and cooling after pouring; b. milling: placing neodymium iron boron particles into an airflow mill for high-speed collision so as to form powder under the high-speed collision of the particles, collecting the formed powder, placing the collected powder into a sieving machine for sieving, and removing impurities in the magnetic powder; c. molding: the method comprises orientation and profiling, wherein the orientation is used for enabling the easy magnetization direction c axis of the disorderly oriented powder particles to rotate to the same direction, so that the maximum remanence is obtained; the main purpose of the pressing is to press the powder into crush with certain shape and size, and simultaneously to keep the degree of grain orientation obtained in the magnetic field orientation as much as possible; d. and (3) sintering: putting the product into a sintering furnace, and sintering to obtain a blank product; e. and (3) machining: the neodymium iron boron magnets obtained after sintering are all blanks, and need to be further machined to obtain products with different sizes, sizes and shapes; f. surface treatment: the surface treatment is carried out on the rare earth permanent magnets in various shapes so as to ensure the appearance and the corrosion resistance of the product; g. and (3) inspecting and packaging a finished product: various magnetic properties, corrosion resistance, high-temperature properties and the like of the product are detected, and the product is packaged after reaching the standard so as to meet various requirements of customers; the temperature of the throwing hydrogen crushing material in the step d is 1050 ℃, the temperature of the ingot casting hydrogen crushing material is 1070 ℃, and the temperature of the ingot casting material is 1100 ℃; the step e comprises a cutting operation, namely, a slicing machine is used for processing the wafer and the small and medium square blocks, and a double-sided grinding machine with higher precision or with the CPK requirement is required to be processed; the sintering process of the step d comprises the following steps: feeding, sintering, discharging, demagnetizing and back burning; the surface treatment in the step f comprises electroplating, and the electroplating specifically comprises: zinc plating, nickel plating, electrophoresis, phosphorization, gold plating, and the like.
As shown in fig. 1 to 14, the screening machine in the step b includes a barrel body 1 and a box body 2 disposed at the bottom of the barrel body 1, a material receiving box 4 is disposed in the box body 2, a first movable groove 16 is disposed on the inner wall of the barrel body 1, a sieve plate 14 is disposed in the first movable groove 16, a connecting spring 161 is disposed at the top of the first movable groove 16, the sieve plate 14 is disposed at the bottom end of the connecting spring 161, a first connecting plate 3 is disposed in the barrel body 1, a connecting shaft 33 is disposed at the bottom of the first connecting plate 3, a stirring rod 34 is disposed on the side wall of the connecting shaft 33, a connecting rod 31 is disposed on the side wall of the first connecting plate 3, a connecting ring 32 is disposed at one end of the connecting rod 31, a second movable groove matched with the connecting ring 32 is disposed on the inner wall of the, when the driving motor 111 drives the connecting ring 32 to rotate, the sieve plate 14 moves up and down along the inner wall of the first movable groove 16; after the magnetic powder is prepared, the magnetic powder is put into the barrel body 1, the magnetic powder is placed on the surface of the sieve plate 14, the driving motor 111 drives the connecting ring 32 to rotate, the connecting ring 32 drives the first connecting plate 3 to rotate, and the magnetic powder is uniformly stirred when the stirring rod 34 rotates, so that the magnetic powder is dispersed in the barrel body 1; first connecting plate 3 drives sieve 14 and moves in first movable groove 16 when rotating, and sieve 14 up-movement under connecting spring 161 elasticity after down-movement, the quick up-movement of pulling sieve 14 makes sieve 14 shake off the magnetic after producing the collision with first movable groove 16 top, makes the magnetic drop to connect in the magazine 4 from sieve 14, gets rid of the impurity in the magnetic.
The magnetic powder in the barrel body is stirred and dispersed through the stirring action of the stirring rod on the magnetic powder, the situation that the magnetic powder is combined with each other to form a large block to block a sieve pore is avoided, and the magnetic powder is prevented from wrapping impurities in the middle to influence the filtering effect of the magnetic powder; the sieve plate is driven to move up and down in the first movable groove by the rotation of the stirring rod, so that scattered magnetic powder is shaken off from the sieve holes when the sieve plate vibrates, the magnetic powder falls off from the sieve plate, and the sieve plate is convenient to sieve the magnetic powder; under the effect of coupling spring, make the sieve produce great up-motion's power after down-motion to produce the collision with first movable groove top when making the quick up-motion of sieve, the sieve produces great vibrations under the collision, and the effectual magnetic that shakes on the sieve is scattered, makes the magnetic drop from the sieve, and further promotion is to the filter effect of magnetic.
A first movable cavity 15 is arranged on the side wall of the barrel body, the first movable groove and the second movable groove are communicated through the first movable cavity, a push plate 141 is arranged on the sieve plate, the push plate penetrates through the first movable cavity, the top of the push plate is arranged in the second movable groove, a third bump 321 matched with the push plate is arranged at the bottom of the connecting ring, two ends of the bottom of the third bump are of circular arc structures, and two ends of the top of the push plate are of circular arc structures, so that the third bump is matched with the push plate conveniently; when the connecting ring rotates, the connecting ring drives the third bump to rotate, so that the third bump is connected with the push plate coarsely, the third bump pushes the push plate to move downwards, the push plate pushes the sieve plate to move downwards, the up-and-down movement of the sieve plate in the first movable groove is realized, and the magnetic powder on the sieve plate can be shaken off from the sieve plate conveniently.
The supporting blocks 162 are arranged at the tops of the first movable grooves, the rubber pads 163 are arranged at the bottoms of the supporting blocks, when the sieve plate moves upwards under the action of the connecting springs, the sieve plate collides with the supporting blocks, the rubber pads play a role in buffering the sieve plate, and damage to the sieve plate caused by direct collision with the supporting blocks is avoided; under the effect of rubber pad, make the sieve produce the trend of downstream after colliding with the rubber pad, make the sieve lie in the residual part kinetic energy of rubber pad collision back, drive the sieve and produce continuous vibrations, tremble the magnetic on the sieve and scatter, be convenient for shake off the magnetic from the sieve.
Be equipped with equipment chamber 11 on the staving lateral wall, driving motor locates the equipment intracavity, is equipped with drive wheel 112 on driving motor's the output shaft, and the drive wheel is with go-between transmission cooperation, under the effect of drive wheel, gives the go-between with driving motor's power transmission, drives the go-between and rotates to make the go-between drive puddler rotate, provide kinetic energy for puddler and sieve, promote the filter effect to the magnetic.
A second connecting plate 12 is arranged on the inner wall of the barrel body 1, the second connecting plate 12 is hinged to the inner wall of the barrel body 1, a third connecting plate 13 is arranged on the sieve plate 14, the third connecting plate 13 is hinged to the sieve plate 14, one end of the second connecting plate 12 and one end of the third connecting plate 13 are hinged to a point, a first convex block 121 is arranged on the second connecting plate 12, and a second convex block 341 matched with the first convex block 121 is arranged at the bottom of the stirring rod 34; after the magnetic powder is placed in the barrel body 1, the driving motor 111 drives the connecting ring 32 to rotate, so that the connecting ring 32 drives the stirring rod 34 to rotate, the stirring rod 34 is in contact with the magnetic powder and simultaneously drives the second bump 341 to rotate, the second bump 341 is in contact with the first bump 121 to push the first bump 121 to move downwards, the sieve plate 14 shakes with the second bump 341 in a small amplitude and high frequency manner to shake the magnetic powder off the sieve plate 14, and the magnetic powder is separated from impurities; the first lug is in discontinuous contact with the second lug along with the rotation of the stirring rod, the first lug pushes the second lug to move downwards, the second lug pushes the second connecting plate to move downwards, the second connecting plate pushes the third connecting plate to move downwards, and the third connecting plate pushes the sieve plate to move downwards; when the puddler rotates, push the sieve toward first activity tank bottom below motion under the puddler effect, the sieve motion drives the motion of third connecting plate, make the motion of third connecting plate pulling second connecting plate, second connecting plate and third connecting plate rotate round the tie point, make second connecting plate and third connecting plate play the closure effect to first activity groove, avoid the sieve magnetic to drop to first activity inslot when down moving, be convenient for clear up staving inside, prevent that the magnetic from causing the influence to the motion of sieve.
A cavity is arranged in the box body 2, a material receiving groove 22 is arranged in the cavity, the material receiving groove 22 is arranged below the sieve plate 14, the material receiving box 4 is arranged on one side of the material receiving groove 22, a guide rod 23 is arranged in the cavity, an installation plate 24 is arranged at the bottom of the guide rod 23, an air cylinder 25 is arranged at the top of the installation plate 24, a piston rod of the air cylinder 25 is arranged on the installation plate 24 in a penetrating manner, an iron plate 251 is arranged on the piston rod of the air cylinder 25, and a scraper 26 is arranged above the material; after the magnetic powder falls from the sieve plate 14, the magnetic powder falls into the material receiving groove 22, the mounting plate 24 moves along the guide rod 23, the mounting plate 24 moves to the position above the material receiving groove 22, the air cylinder 25 drives the iron plate 251 to move downwards, the iron plate 251 is in contact with the magnetic powder, the magnetic powder is adsorbed at the bottom of the iron plate 251, the air cylinder 25 drives the iron plate 251 to move to the position in contact with the bottom surface of the mounting plate 24, the mounting plate 24 moves to the position above the material receiving box 4 along the guide rod 23, the air cylinder 25 drives the iron plate 251 to move downwards, the bottom surface of the iron plate 251 is in contact with the scraper 26, the mounting plate 24 is moved along the guide rod 23, the scraper 26 hangs down the magnetic powder; the magnetic powder is conveyed under the action of the iron plate, and is separated from small particle impurities falling together, so that the screening effect of the magnetic powder is improved, and the impurities in the magnetic powder are effectively removed; under the action of the scraper, magnetic powder at the bottom of the iron plate is effectively scraped, so that the magnetic powder falls into the material receiving box, and the magnetic powder is collected through the material receiving box, so that the magnetic powder after screening is obtained; the mounting panel drives iron plate and removes in the cavity, makes the mounting panel be in the material receiving box top when the magnetic drops from the sieve, avoids the magnetic to drop and causes the inconvenience of magnetic clearance at the mounting panel top, and the mounting panel removes again after the magnetic all drops in connecing the silo, will connect the magnetic transport in the silo to connect in the material receiving box, does further screening to the magnetic, is convenient for collect the magnetic after the screening.
Be equipped with the logical groove of material receiving box matched with on the cavity lateral wall, be equipped with the ejector pad on the material receiving box lateral wall, after the magnetic is collected in the material receiving box, toward the outer ejector pad that stimulates, will receive the material receiving box and pull out in the cavity, be convenient for collect the magnetic after the screening, reduce the magnetic and collect the degree of difficulty.
The side wall of the guide rod is provided with a sliding groove 231, the top of the mounting plate is provided with a connecting block, the connecting block is provided with a sliding block 241 matched with the sliding groove, and under the mutual matching of the sliding block and the sliding groove, the mounting plate is supported, so that the mounting plate is prevented from falling off the guide rod, and the matching effect of the mounting plate and the guide rod is improved; the one end top that the sieve below was located to the guide arm is equipped with toper top 232, avoids the magnetic powder to drop long-pending stay at the guide arm top, is convenient for clear up the screening machine is inside.
The sieve plate is provided with a second movable cavity 142, the sieve plate is also provided with a through hole, the through hole penetrates through the second movable cavity, a stop dog 143 matched with the through hole is arranged in the second movable cavity, a limiting spring is arranged on the side wall of the stop dog, one end of the second movable cavity is provided with a roller, a connecting rope is wound on the roller, the other end of the connecting rope is connected with the stop dog, and a micro motor is arranged in the second movable cavity; when the magnetic powder completely falls off from the sieve plate, the micro motor drives the roller to rotate, so that the roller drives the connecting rope to rotate, the connecting rope is wound on the roller, the baffle is pulled to move towards the inside of the second movable cavity, the through hole is in an open state, the driving motor drives the stirring rod to rotate, so that the sieve plate vibrates, impurities on the sieve plate are shaken off from the through hole, and the sieve plate is cleaned; impurity drops to connect the silo from through-hole department in, is equipped with sealing door 21 on the box lateral wall, and sealing door one end articulates on the box lateral wall, is convenient for to dock the impurity in the silo after opening sealing door and clears up.
When the magnetic powder is screened, the magnetic powder is placed in the barrel body, the magnetic powder and impurities are placed on the screen plate together, the driving motor drives the connecting ring to rotate, the connecting ring rotates to drive the stirring rod to rotate, the stirring rod plays a role in stirring the magnetic powder, the first lug is in contact with the second lug, the first lug pushes the second lug to move downwards, the second connecting plate is pushed to move downwards under the action of the first lug, and the second connecting plate pushes the third connecting plate to move downwards to drive the screen plate to vibrate in a small amplitude; the third bump is contacted with the push plate, so that the third bump pushes the push plate to move downwards, and the sieve plate generates vibration with a larger amplitude; the sieve plate is vibrated discontinuously and greatly in continuous small-amplitude vibration, the vibration effect of the sieve plate is improved, and the magnetic powder is shaken off from the sieve holes after being shaken from a block shape, so that the magnetic powder is prevented from being retained on the sieve plate; after magnetic powder falls into the material receiving groove, the mounting plate moves along the guide rod, the mounting plate is moved to the position above the material receiving groove, the iron plate is driven by the air cylinder to move downwards to be contacted with the magnetic powder, the magnetic powder is adsorbed at the bottom of the iron plate, the iron plate is driven by the air rod to ascend to be contacted with the bottom surface of the mounting plate, the mounting plate drives the iron plate to move, the iron plate is moved to the position above the material receiving box, the iron plate is driven by the air cylinder to move downwards to be contacted with the scraper, the mounting plate drives the iron plate to move towards the scraper, the magnetic powder at the bottom of the iron plate is scraped under the action of; when the magnetic powder is collected, the micro motor drives the stop block to move towards the second movable cavity to open the through hole, the driving motor drives the stirring rod to rotate, so that the sun bar vibrates, impurities on the sieve plate fall from the through hole, the impurities on the sieve plate fall into the material receiving groove through the through hole, the impurities on the sieve plate are mixed with the impurities in the material receiving groove, the sealing door is opened, and the impurities in the material receiving groove are cleaned; the push block is pulled towards the outer side of the box body, the material receiving box is pulled towards the outer side of the box body, and magnetic powder in the material receiving box is recovered, so that the magnetic powder can be conveniently processed on the next step.
Example 2:
a neodymium iron boron magnet manufacturing process comprises the following steps: a. smelting: charging, vacuumizing to below 1Pa, starting to heat at low power, continuously exhausting while heating, gradually desorbing and exhausting adsorbed gas and water along with temperature rise until furnace burden is dark red, closing a valve, filling argon, increasing power, heating until the furnace burden is completely melted, refining for 5 minutes, reducing power after refining, pouring, and cooling after pouring; b. milling: placing neodymium iron boron particles into an airflow mill for high-speed collision so as to form powder under the high-speed collision of the particles, collecting the formed powder, placing the collected powder into a sieving machine for sieving, and removing impurities in the magnetic powder; c. molding: the method comprises orientation and profiling, wherein the orientation is used for enabling the easy magnetization direction c axis of the disorderly oriented powder particles to rotate to the same direction, so that the maximum remanence is obtained; the main purpose of the pressing is to press the powder into crush with certain shape and size, and simultaneously to keep the degree of grain orientation obtained in the magnetic field orientation as much as possible; d. and (3) sintering: putting the product into a sintering furnace, and sintering to obtain a blank product; e. and (3) machining: the neodymium iron boron magnets obtained after sintering are all blanks, and need to be further machined to obtain products with different sizes, sizes and shapes; f. surface treatment: the surface treatment is carried out on the rare earth permanent magnets in various shapes so as to ensure the appearance and the corrosion resistance of the product; g. and (3) inspecting and packaging a finished product: various magnetic properties, corrosion resistance, high-temperature properties and the like of the product are detected, and the product is packaged after reaching the standard so as to meet various requirements of customers; the temperature of the hydrogen scrap spinning in the step d is 1085 ℃, the temperature of the hydrogen scrap casting is 1095 ℃, and the temperature of the hydrogen scrap casting is 1135 ℃; the step e comprises a cutting operation, namely, a slicing machine is used for processing the wafer and the small and medium square blocks, and a double-sided grinding machine with higher precision or with the CPK requirement is required to be processed; the sintering process of the step d comprises the following steps: feeding, sintering, discharging, demagnetizing and back burning; the surface treatment in the step f comprises electroplating, and the electroplating specifically comprises: zinc plating, nickel plating, electrophoresis, phosphorization, gold plating, and the like; the structure of the screening machine is the same as that of the screening machine in the embodiment 1.
Example 3:
a neodymium iron boron magnet manufacturing process comprises the following steps: a. smelting: charging, vacuumizing to below 1Pa, starting to heat at low power, continuously exhausting while heating, gradually desorbing and exhausting adsorbed gas and water along with temperature rise until furnace burden is dark red, closing a valve, filling argon, increasing power, heating until the furnace burden is completely melted, refining for 5 minutes, reducing power after refining, pouring, and cooling after pouring; b. milling: placing neodymium iron boron particles into an airflow mill for high-speed collision so as to form powder under the high-speed collision of the particles, collecting the formed powder, placing the collected powder into a sieving machine for sieving, and removing impurities in the magnetic powder; c. molding: the method comprises orientation and profiling, wherein the orientation is used for enabling the easy magnetization direction c axis of the disorderly oriented powder particles to rotate to the same direction, so that the maximum remanence is obtained; the main purpose of the pressing is to press the powder into crush with certain shape and size, and simultaneously to keep the degree of grain orientation obtained in the magnetic field orientation as much as possible; d. and (3) sintering: putting the product into a sintering furnace, and sintering to obtain a blank product; e. and (3) machining: the neodymium iron boron magnets obtained after sintering are all blanks, and need to be further machined to obtain products with different sizes, sizes and shapes; f. surface treatment: the surface treatment is carried out on the rare earth permanent magnets in various shapes so as to ensure the appearance and the corrosion resistance of the product; g. and (3) inspecting and packaging a finished product: various magnetic properties, corrosion resistance, high-temperature properties and the like of the product are detected, and the product is packaged after reaching the standard so as to meet various requirements of customers; the temperature of the throwing hydrogen crushing material in the step d is 1065 ℃, the temperature of the ingot casting hydrogen crushing material is 1080 ℃, and the temperature of the ingot casting material is 1120 ℃; the step e comprises a cutting operation, namely, a slicing machine is used for processing the wafer and the small and medium square blocks, and a double-sided grinding machine with higher precision or with the CPK requirement is required to be processed; the sintering process of the step d comprises the following steps: feeding, sintering, discharging, demagnetizing and back burning; the surface treatment in the step f comprises electroplating, and the electroplating specifically comprises: zinc plating, nickel plating, electrophoresis, phosphorization, gold plating, and the like; the structure of the screening machine is the same as that of the screening machine in the embodiment 1.

Claims (5)

1. A neodymium iron boron magnet manufacturing process is characterized in that: the method comprises the following steps:
a. smelting: firstly charging and then vacuumizing to below 1Pa, starting to send power for heating, continuously exhausting while heating, gradually desorbing and exhausting absorbed gas and water along with temperature rise until furnace burden is dark red, closing a valve to fill argon, increasing power and heating until the furnace burden is completely melted, refining for 5 minutes, reducing power and pouring after refining is finished, and cooling after pouring is finished;
b. milling: placing neodymium iron boron particles into an airflow mill for collision, enabling the particles to form powder under the collision, collecting the formed powder, placing the collected powder into a sieving machine for sieving, and removing impurities in the magnetic powder;
c. molding: comprises orientation and pressing, wherein the orientation is used for rotating the easy magnetization direction c axis of the disorderly oriented powder particles to the same direction, so that the maximum remanence is obtained; the purpose of the pressing is to press the powder into a compact of a certain shape and size while maintaining as much as possible the degree of grain orientation obtained in the magnetic field orientation;
d. and (3) sintering: putting the product into a sintering furnace, and sintering to obtain a blank product;
e. and (3) machining: the neodymium iron boron magnets obtained after sintering are all blanks, and are further machined to obtain products with different sizes, sizes and shapes;
f. surface treatment: carrying out surface treatment on the neodymium iron boron magnets in various shapes so as to ensure the appearance and the corrosion resistance of the product;
g. and (3) inspecting and packaging a finished product: detecting various magnetic properties and corrosion resistance of the product, and packaging after reaching the standard;
wherein the screening machine in the step b comprises a barrel body (1) and a box body (2) arranged at the bottom of the barrel body (1), a material receiving box (4) is arranged in the box body (2), a first movable groove (16) is arranged on the inner wall of the barrel body (1), a sieve plate (14) is arranged in the first movable groove (16), a connecting spring (161) is arranged at the top of the first movable groove (16), the sieve plate (14) is arranged at the bottom end of the connecting spring (161), a first connecting plate (3) is arranged in the barrel body (1), a connecting shaft (33) is arranged at the bottom of the first connecting plate (3), a stirring rod (34) is arranged on the side wall of the connecting shaft (33), a connecting rod (31) is arranged on the side wall of the first connecting plate (3), a connecting ring (32) is arranged at one end of the connecting rod (31), a second movable groove matched with the connecting ring (, a driving motor (111) for driving the connecting ring (32) to rotate is arranged on the side wall of the barrel body (1), and when the driving motor (111) drives the connecting ring (32) to rotate, the sieve plate (14) moves up and down along the inner wall of the first movable groove (16); after the magnetic powder is prepared, the magnetic powder is placed in the barrel body (1) and is placed on the surface of the sieve plate (14), the driving motor (111) drives the connecting ring (32) to rotate, the connecting ring (32) drives the first connecting plate (3) to rotate, and the magnetic powder is uniformly stirred when the stirring rod (34) rotates, so that the magnetic powder is dispersed in the barrel body (1); the first connecting plate (3) drives the sieve plate (14) to move in the first movable groove (16) when rotating, the sieve plate (14) moves upwards under the elasticity of the connecting spring (161) after moving downwards, the sieve plate (14) is pulled to move upwards quickly, magnetic powder is shaken off after the sieve plate (14) collides with the top of the first movable groove (16), the magnetic powder falls into the material receiving box (4) from the sieve plate (14), and impurities in the magnetic powder are removed;
a second connecting plate (12) is arranged on the inner wall of the barrel body (1), the second connecting plate (12) is movably connected to the inner wall of the barrel body (1), a third connecting plate (13) is arranged on the sieve plate (14), the third connecting plate (13) is movably connected to the sieve plate (14), one end of the second connecting plate (12) and one end of the third connecting plate (13) are hinged to one point, a first convex block (121) is arranged on the second connecting plate (12), and a second convex block (341) matched with the first convex block (121) is arranged at the bottom of the stirring rod (34); after the magnetic powder is placed in the barrel body (1), the driving motor (111) drives the connecting ring (32) to rotate, the connecting ring (32) drives the stirring rod (34) to rotate, the stirring rod (34) is in contact with the magnetic powder and simultaneously drives the second lug (341) to rotate, the second lug (341) is in contact with the first lug (121) to push the first lug (121) to move downwards, the sieve plate (14) vibrates along with the second lug (341), the magnetic powder is shaken off from the sieve plate (14), and the magnetic powder is separated from impurities.
2. A process for manufacturing a nd-fe-b magnet according to claim 1, wherein: and e, cutting the wafer and the square by using a slicing machine, and processing the wafer and the square by using a double-sided grinding machine with higher precision or with the CPK requirement.
3. A process for manufacturing a nd-fe-b magnet according to claim 1, wherein: the sintering process of the step d comprises the following steps: charging, sintering, discharging, demagnetizing and back burning.
4. A process for manufacturing a nd-fe-b magnet according to claim 1, wherein: the surface treatment in the step f comprises electroplating, and the electroplating specifically comprises: zinc plating, nickel plating or gold plating.
5. A process for manufacturing a nd-fe-b magnet according to claim 1, wherein: a cavity is arranged in the box body (2), a material receiving groove (22) is arranged in the cavity, the material receiving groove (22) is arranged below the sieve plate (14), the material receiving box (4) is arranged on one side of the material receiving groove (22), a guide rod (23) is arranged in the cavity, a mounting plate (24) is arranged at the bottom of the guide rod (23), an air cylinder (25) is arranged at the top of the mounting plate (24), a piston rod of the air cylinder (25) is arranged on the mounting plate (24) in a penetrating manner, an iron plate (251) is arranged on the piston rod of the air cylinder (25), and a scraper plate (26) is arranged above the material receiving; after the magnetic powder falls from the sieve plate (14), the magnetic powder falls in the material receiving groove (22), the mounting plate (24) moves along the guide rod (23), the mounting plate (24) is moved to the position above the material receiving groove (22), the air cylinder (25) drives the iron plate (251) to move downwards, the iron plate (251) is in contact with the magnetic powder, the magnetic powder is adsorbed at the bottom of the iron plate (251), the air cylinder (25) drives the iron plate (251) to move to the position in contact with the bottom surface of the mounting plate (24), the mounting plate (24) is moved to the position above the material receiving box (4) along the guide rod (23), the air cylinder (25) drives the iron plate (251) to move downwards, the bottom surface of the iron plate (251) is in contact with the scraper blade (26), the mounting plate (24) is moved along the guide rod (23), the magnetic powder on the surface of the iron plate (251) is scraped down by the scraper.
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