CN114883102A - Neodymium iron boron magnetic steel processing system and neodymium iron boron special-shaped magnetic steel processing method - Google Patents
Neodymium iron boron magnetic steel processing system and neodymium iron boron special-shaped magnetic steel processing method Download PDFInfo
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- CN114883102A CN114883102A CN202210469666.6A CN202210469666A CN114883102A CN 114883102 A CN114883102 A CN 114883102A CN 202210469666 A CN202210469666 A CN 202210469666A CN 114883102 A CN114883102 A CN 114883102A
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- magnetic steel
- iron boron
- neodymium iron
- boron magnetic
- ceramic die
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus 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
- H01F41/02—Apparatus 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
- H01F41/0253—Apparatus 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
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- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention relates to the field of neodymium iron boron magnetic steel processing, in particular to a neodymium iron boron magnetic steel processing system and a neodymium iron boron special-shaped magnetic steel processing method. The processing system comprises a ceramic die, round holes, two pushing columns and a supporting rod, wherein the ceramic die is provided with a cuboid groove, the left side and the right side of the ceramic die are respectively provided with a round hole, the two pushing columns are inserted into the two round holes in a clearance fit mode respectively, and the lower ends of the two pushing columns are fixed at the left end and the right end of the supporting rod respectively. The method comprises the following steps: adding pure iron, ferroboron and rare earth fluoride into a crucible of a vacuum melting chamber under a vacuum condition; pouring the refined molten liquid on a mould to prepare a plurality of alloy sheets; gluing the surfaces of the alloy sheets, and bonding the alloy sheets together after the alloy sheets are stacked to form a neodymium iron boron magnetic steel stacked part; carrying out hot pressing treatment on the neodymium iron boron magnetic steel superposed part to obtain a neodymium iron boron magnetic steel hot pressed part; and baking and forming the neodymium iron boron magnetic steel hot pressing part to obtain the neodymium iron boron special-shaped magnetic steel. Alloy sheets can be prepared.
Description
Technical Field
The invention relates to the field of neodymium iron boron magnetic steel processing, in particular to a neodymium iron boron magnetic steel processing system and a neodymium iron boron special-shaped magnetic steel processing method.
Background
The neodymium-iron-boron magnet is an intermetallic compound consisting of a rare earth element Nd, iron and boron. Nd is mainly neodymium or a combination of neodymium and other rare earth elements, and some iron may be substituted with cobalt, aluminum, vanadium, or the like. The rare earth permanent magnetic material is a known permanent magnetic material with the highest comprehensive performance, has much better performance than ferrite and alnico, and has twice higher magnetic performance than expensive platinum-cobalt alloy. The ndfeb magnet needs to be made into various shapes sometimes, but some shapes are not easy to be made, so the ndfeb magnet needs to be made into a plurality of alloy sheets, and then the alloy sheets are bonded to form the ndfeb special-shaped magnet.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the neodymium iron boron magnetic steel processing system and the neodymium iron boron special-shaped magnetic steel processing method.
The utility model provides a neodymium iron boron magnetic steel system of processing, includes ceramic mould, round hole, pushes away post and die-pin, the last groove that is provided with the cuboid of ceramic mould respectively is provided with a round hole about on the ceramic mould, and two push away the post respectively clearance fit insert on two round holes, and two lower extremes that push away the post are fixed both ends about the die-pin respectively.
Still include bracket slot and bracket, two round hole departments all are provided with the bracket slot, and two upper end homogeneous integrated into one piece that push away the post have the bracket, and two brackets clearance fit insert respectively on two bracket slots.
The ceramic die is connected to the upper portion of the bottom frame through screws.
And the upper side of the middle part of the support rod is fixedly connected with a compression spring, and the upper end of the compression spring is fixed at the lower side of the ceramic die.
A method for processing neodymium iron boron special-shaped magnetic steel by a neodymium iron boron magnetic steel processing system comprises the following steps:
the method comprises the following steps: adding pure iron, ferroboron and rare earth fluoride into a crucible of a vacuum melting chamber under a vacuum condition, and heating to 1500 ℃ for refining;
step two: pouring the refined molten liquid on a mould to prepare a plurality of alloy sheets;
step three: gluing the surfaces of the alloy sheets, and then laminating and bonding the alloy sheets together to form a neodymium iron boron magnetic steel superposed part;
step four: carrying out hot pressing treatment on the neodymium iron boron magnetic steel superposed part to obtain a neodymium iron boron magnetic steel hot pressed part;
step five: and baking and forming the neodymium iron boron magnetic steel hot pressing part to obtain the neodymium iron boron special-shaped magnetic steel.
Drawings
The invention is described in further detail below with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a first schematic structural diagram of a NdFeB magnet machining system;
FIG. 2 is a schematic structural diagram II of a NdFeB magnet machining system;
FIG. 3 is a schematic structural diagram III of a NdFeB magnet machining system;
FIG. 4 is a first schematic structural view of a ceramic mold;
FIG. 5 is a second schematic structural view of a ceramic mold;
FIG. 6 is a schematic side bar construction;
FIG. 7 is a first schematic side frame configuration;
FIG. 8 is a schematic view of the sideframe configuration II;
FIG. 9 is a first structural view of the semi-cylindrical case I;
fig. 10 is a structural schematic diagram of the semi-cylindrical box I.
In the figure: a ceramic mold 101; a circular hole 102; a bracket slot 103; a bracket 104; a push post 105; a chassis 106; a hydraulic cylinder I107; a support rod 108;
a side lever 201; a hydraulic cylinder II 202; a stand 203; a track rod 204; a hydraulic cylinder III 205; a compression leg 206; a channel clamp 207;
a side frame 301; a triangular groove 302; a sponge strip 303; a rotating shaft 304; a pedestal 305; a friction wheel 306; a convex plate 307; a connecting piece 308;
a semi-cylindrical box I401; a semi-cylindrical box II 402; a glue injection groove 403; a connecting strip 404.
Detailed Description
As shown in fig. 1-10, this example solves the problem of making alloy sheets,
because neodymium iron boron magnetic steel system of processing includes ceramic mould 101, round hole 102, push away post 105 and die-pin 108, be equipped with the groove of cuboid on the ceramic mould 101, two round holes 102 are opened respectively at the left and right both ends of ceramic mould 101, two push away post 105 clearance fit insert respectively on two round holes 102, the lower extreme of two push away post 105 passes through the screw connection respectively at the left and right both ends of die-pin 108, and then pour the pure iron after the refining, ferroboron, fluoridized tombarthite into ceramic mould 101, treat that the alloy solidifies the back can form the alloy piece, can drive two push away post 105 upwards to slide through the up-sliding of die-pin 108, and then jack up the alloy piece after will solidifying from ceramic mould 101, be convenient for the alloy piece to take off, make a plurality of alloy pieces with this operation.
As shown in fig. 1-10, this example solves the problem of holding the alloy sheet horizontally stable,
because neodymium iron boron magnetic steel system of processing still includes bracket slot 103 and bracket 104, bracket slot 103 has all been opened to two round hole 102 departments, bracket slot 103 is the door shape, both ends extend to two lateral walls in the front and back of ceramic mould 101 around bracket slot 103, two equal integrated into one piece in upper end that push away post 105 have bracket 104, bracket 104 clearance fit is inserted on corresponding bracket slot 103, after waiting that the alloy solidifies the back formation alloy piece, die-pin 108 drives two and pushes away post 105 while rebound, then drive two brackets 104 while rebound, two brackets 104 rebound simultaneously can keep the stable support of level with the alloy piece, and then take out the alloy piece.
As shown in fig. 1 to 10, this example solves the problem of the bottom chassis 106 supporting the ceramic mold 101,
because neodymium iron boron magnetic steel system of processing still includes chassis 106, chassis 106 passes through the screw fixation in the downside of ceramic mould 101, and chassis 106 plays the supporting role to ceramic mould 101.
As shown in fig. 1-10, this example solves the problem of having two brackets 104 normally disposed in two bracket slots 103,
the upper side of the middle of the supporting rod 108 is provided with a sleeving cylinder, the lower side of the ceramic die 101 is also provided with a sleeving cylinder, two ends of a compression spring are sleeved on the two sleeving cylinders respectively, the compression spring provides downward force to the supporting rod 108, so that the two pushing columns 105 and the two brackets 104 always have a downward moving trend, and the two brackets 104 are placed in the two bracket grooves 103 at ordinary times.
As shown in fig. 1-10, this example solves the problem of the cylinder I107 extending to move the rest bar 108, the two push posts 105 and the two brackets 104 upward,
because neodymium iron boron magnetic steel system of processing still includes pneumatic cylinder I107, the lower extreme of pneumatic cylinder I107 has the flange certainly, and the flange on the pneumatic cylinder I107 passes through the screw connection on chassis 106, and the downside at die-pin 108 is pushed up to the upper end of pneumatic cylinder I107, can drive die-pin 108, two posts 105 and two brackets 104 rebound when pneumatic cylinder I107 extends.
As shown in fig. 1-10, this example solves the problem of two channel clamps 207 being close together to secure the alloy sheet,
because the neodymium iron boron magnetic steel processing system further comprises the vertical frames 203, the hydraulic cylinders III205, the pressing columns 206 and the groove-shaped clamping pieces 207, the vertical frames 203 are arranged on the front side and the rear side of the ceramic die 101, the pressing columns 206 are inserted into the upper portions of the vertical frames 203 in a clearance fit mode in the front-rear direction, the groove-shaped clamping pieces 207 are welded to the inner ends of the two pressing columns 206, one end of the hydraulic cylinder III205 is connected to the vertical frames 203 through a flange, the other end of the hydraulic cylinder III205 is connected to the pressing columns 206 through a flange, the pressing columns 206 can be driven to slide back and forth on the vertical frames 203 through the extension and retraction of the hydraulic cylinder III205, the two groove-shaped clamping pieces 207 are driven to move back and forth, the two groove-shaped clamping pieces 207 are close to or far away from each other, when the two brackets 104 simultaneously move upwards to hold the alloy pieces horizontally and stably, the two groove-shaped clamping pieces 207 are close to clamp pieces to clamp the alloy pieces tightly, and then the two brackets 104 can move downwards to return to the original positions.
As shown in fig. 1-10, this example solves the problem of moving the alloy sheet sandwiched between the two channel-like clamping members 207 to the right,
because the neodymium iron boron magnetic steel processing system also comprises a side rod 201, a hydraulic cylinder II202 and track rods 204, the side rod 201 is welded on the left side of the bottom frame 106, the left ends of the two track rods 204 are respectively welded on the front end and the rear end of the side rod 201, the lower parts of the two vertical frames 203 are respectively inserted on the two track rods 204 in a clearance fit manner, the front end and the rear end of the side rod 201 are respectively connected with the hydraulic cylinder II202 through flanges, the other ends of the two hydraulic cylinders II202 are respectively connected on the two vertical frames 203 through flanges, and the two groove-shaped clamping pieces 207 are both positioned above the ceramic die 101; and then the two upright stands 203 can be driven to slide left and right on the two track rods 204 respectively by simultaneously extending or shortening the two hydraulic cylinders II202, so that the alloy sheet clamped between the two trough clamping pieces 207 can be moved rightwards.
As shown in fig. 1-10, this example solves the problem of resistance to high temperatures after melting of pure iron, ferroboron, rare earth fluorides,
because the materials of the ceramic die 101, the bracket 104 and the push column 105 are all ceramics, the ceramics have good high temperature resistance and can resist the high temperature after the smelting of pure iron, ferroboron and rare earth fluoride.
Neodymium iron boron magnetic steel system of processing still includes side bearer 301, triangular groove 302, sponge strip 303, pivot 304 and pedestal 305, side bearer 301 connects the right side at chassis 106 through the pole of an L shape, both ends all weld pedestal 305 around side bearer 301 upper portion, be connected with two pivots 304 through the bearing rotation between two pedestals 305, two pivots 304 set up from top to bottom, it is provided with a plurality of sponge strips 303 all to be the annular on every pivot 304, all be provided with a plurality of triangular grooves 302 after to in the past on every sponge strip 303, there are two servo motor I at the rear portion of side bearer 301 through the screw connection, two servo motor I's output shaft passes through the shaft coupling and fixes the rear portion at two pivots 304 respectively.
As shown in fig. 1-10, this example solves the problem of multiple sponge strips 303 spreading glue on both sides of the alloy sheet,
after the alloy sheet clamped between the two groove-shaped clamping pieces 207 is moved rightwards, the alloy sheet is inserted between the two rotating shafts 304, glue is added at the two rotating shafts 304, the two servo motors I respectively drive the two rotating shafts 304 to rotate, and then the sponge strips 303 on each rotating shaft 304 are driven to rotate, and further the alloy sheet continuously moves rightwards, the glue is smeared on the two sides of the alloy sheet by the sponge strips 303, a plurality of triangular grooves 302 are formed in each sponge strip 303, glue can conveniently circulate on the two sides of each sponge strip 303, and left and right separation of the glue after the sponge strips 303 are contacted with the alloy sheet is prevented. After the alloy piece that produces and scribble glue is whole to a plurality of, can be in the same place a plurality of alloy pieces superposes as required, the shape that the department wanted is superposed as required, then together a plurality of alloy pieces hot pressing, obtain neodymium iron boron magnetic steel hot pressing piece, then toast the shaping with neodymium iron boron magnetic steel hot pressing piece, obtain neodymium iron boron dysmorphism magnetic steel.
Neodymium iron boron magnetic steel system of processing still includes connection piece 308, semi-cylinder box I401, semi-cylinder box II402, injecting glue groove 403 and connecting strip 404, connection piece 308 has all been welded at both ends around the side bearer 301, semi-cylinder box I401 welds between two connection pieces 308, semi-cylinder box I401 sets up the below at the pivot 304 of downside, semi-cylinder box I401's upside is connected with semi-cylinder box II402 through four connecting strip 404, semi-cylinder box II402 sets up the top at the pivot 304 of upside, injecting glue groove 403 sets up on semi-cylinder box II 402.
As shown in fig. 1-10, this example solves the problem of adding glue,
glue can be poured into to the realization in the semicylinder box I401, a plurality of sponge strips 303 that are located the pivot 304 of downside and on it rotate, can drive the glue in the semicylinder box I401 to the downside of alloy piece and paint, then through the pipeline of the injection glue among the prior art, can add glue to the pivot 304 that is located the upside and a plurality of sponge strips 303 on it in injecting glue groove 403 department, the pivot 304 that is located the upside rotates with a plurality of sponge strips 303 on it and paints the upside of alloy piece with glue.
Neodymium iron boron magnetic steel system of processing still includes friction pulley 306 and flange 307, and the front and back both ends on side bearer 301 upper portion have all welded flange 307, and equal two servo motor II of fixedly connected with on every flange 307 all bond on every servo motor II's the output shaft and have friction pulley 306, and two friction pulleys 306 on the same flange 307 set up from top to bottom.
As shown in fig. 1-10, this example solves the problem of moving the alloy sheet to the right,
the alloy sheet is inserted between the four friction wheels 306 in the process of moving rightwards, and the four servo motors II respectively drive the four friction wheels 306 to rotate, so that the alloy sheet is continuously moved rightwards until falling.
A method for processing neodymium iron boron special-shaped magnetic steel by a neodymium iron boron magnetic steel processing system comprises the following steps:
the method comprises the following steps: adding pure iron, ferroboron and rare earth fluoride into a crucible of a vacuum melting chamber under a vacuum condition, and heating to 1500 ℃ for refining;
step two: pouring the refined molten liquid on a mould to prepare a plurality of alloy sheets;
step three: gluing the surfaces of the alloy sheets, and then laminating and bonding the alloy sheets together to form a neodymium iron boron magnetic steel superposed part;
step four: carrying out hot pressing treatment on the neodymium iron boron magnetic steel superposed part to obtain a neodymium iron boron magnetic steel hot pressed part;
step five: and baking and forming the neodymium iron boron magnetic steel hot pressing part to obtain the neodymium iron boron special-shaped magnetic steel.
Claims (10)
1. The utility model provides a neodymium iron boron magnetic steel system of processing, includes ceramic mould (101), round hole (102), pushes away post (105) and die-pin (108), its characterized in that: the ceramic die is characterized in that a cuboid groove is formed in the ceramic die (101), a round hole (102) is formed in the left side and the right side of the ceramic die (101), two pushing columns (105) are inserted into the round holes (102) in a clearance fit mode respectively, and the lower ends of the two pushing columns (105) are fixed to the left end and the right end of the supporting rod (108) respectively.
2. The ndfeb magnetic steel processing system according to claim 1, characterized in that: the push-type bicycle frame is characterized by further comprising bracket grooves (103) and brackets (104), the bracket grooves (103) are formed in the positions of the two round holes (102), the brackets (104) are integrally formed at the upper ends of the two push-type columns (105), and the two brackets (104) are inserted into the two bracket grooves (103) in a clearance fit mode respectively.
3. The ndfeb magnetic steel processing system according to claim 2, characterized in that: the ceramic die further comprises a bottom frame (106), and the ceramic die (101) is connected to the upper portion of the bottom frame (106) through screws.
4. A system for processing ndfeb magnetic steel according to claim 3, characterized in that: the upper side of the middle part of the support rod (108) is fixedly connected with a compression spring, and the upper end of the compression spring is fixed on the lower side of the ceramic die (101).
5. A neodymium iron boron magnetic steel system of processing according to claim 4, characterized in that: the hydraulic support is characterized by further comprising a hydraulic cylinder I (107), the lower end of the hydraulic cylinder I (107) is fixedly connected to the base frame (106), and the upper end of the hydraulic cylinder I (107) is propped against the lower side of the supporting rod (108).
6. A system for processing ndfeb magnetic steel according to claim 3, characterized in that: the ceramic die is characterized by further comprising an upright frame (203), hydraulic cylinders III (205), compression columns (206) and groove-shaped clamping pieces (207), wherein the upright frame (203) is arranged on the front side and the rear side of the ceramic die (101), the upper portion of each upright frame (203) is connected with the compression columns (206) in a sliding mode in the front-rear direction, the groove-shaped clamping pieces (207) are fixedly connected to the inner ends of the two compression columns (206), the hydraulic cylinders III (205) are fixedly connected to the upright frames (203), and the other ends of the hydraulic cylinders III (205) are fixed to the compression columns (206).
7. A neodymium iron boron magnetic steel system of processing according to claim 6, characterized in that: still include side lever (201), pneumatic cylinder II (202) and track pole (204), side lever (201) fixed connection is in the left side of chassis (106), the left end difference fixed connection of two track poles (204) is at the front and back both ends of side lever (201), the lower part difference clearance fit of two grudging posts (203) is inserted on two track poles (204), the equal fixedly connected with pneumatic cylinder II (202) in both ends around side lever (201), the other end difference fixed connection of two pneumatic cylinder II (202) is on two grudging posts (203).
8. The ndfeb magnetic steel processing system according to claim 2, characterized in that: the ceramic die (101), the bracket (104) and the push column (105) are made of ceramic.
9. The ndfeb magnetic steel processing system according to claim 7, characterized in that: the two trough clamping pieces (207) are both positioned above the ceramic die (101).
10. The method for processing neodymium iron boron steel profiled magnetic steel by using the neodymium iron boron steel processing system of claim 1, characterized by comprising the following steps:
the method comprises the following steps: adding pure iron, ferroboron and rare earth fluoride into a crucible of a vacuum melting chamber under a vacuum condition, and heating to 1500 ℃ for refining;
step two: pouring the refined molten liquid on a mould to prepare a plurality of alloy sheets;
step three: gluing the surfaces of the alloy sheets, and then laminating and bonding the alloy sheets together to form a neodymium iron boron magnetic steel superposed part;
step four: carrying out hot pressing treatment on the neodymium iron boron magnetic steel superposed part to obtain a neodymium iron boron magnetic steel hot pressed part;
step five: and baking and forming the neodymium iron boron magnetic steel hot pressing part to obtain the neodymium iron boron special-shaped magnetic steel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210469666.6A CN114883102B (en) | 2022-04-28 | 2022-04-28 | Neodymium iron boron magnetic steel processing system and neodymium iron boron special-shaped magnetic steel processing method |
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| CN202210469666.6A CN114883102B (en) | 2022-04-28 | 2022-04-28 | Neodymium iron boron magnetic steel processing system and neodymium iron boron special-shaped magnetic steel processing method |
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| CN114883102A true CN114883102A (en) | 2022-08-09 |
| CN114883102B CN114883102B (en) | 2022-11-22 |
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| US5791040A (en) * | 1997-02-04 | 1998-08-11 | Eastman Kodak Company | Method for making ceramic tools for the production of micromagnets |
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| CN210412474U (en) * | 2019-08-01 | 2020-04-28 | 湖南联辉新材料有限公司 | Neodymium iron boron rapid forming die |
| CN111834076A (en) * | 2020-07-27 | 2020-10-27 | 宁波美固力磁电有限公司 | Preparation method of high-performance hot-pressed neodymium iron boron magnetic steel |
| CN212704108U (en) * | 2020-06-09 | 2021-03-16 | 江西省世宇金属制品有限责任公司 | Stamping device is used in processing of high added value, special properties steel, alloy product |
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2022
- 2022-04-28 CN CN202210469666.6A patent/CN114883102B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5791040A (en) * | 1997-02-04 | 1998-08-11 | Eastman Kodak Company | Method for making ceramic tools for the production of micromagnets |
| CN204030878U (en) * | 2014-07-30 | 2014-12-17 | 温岭市九洲电机制造有限公司 | A kind of magnet steel pressing machine of wheel hub motor |
| CN107275025A (en) * | 2016-04-08 | 2017-10-20 | 沈阳中北通磁科技股份有限公司 | A kind of Nd-Fe-B magnet steel containing cerium and manufacture method |
| CN210412474U (en) * | 2019-08-01 | 2020-04-28 | 湖南联辉新材料有限公司 | Neodymium iron boron rapid forming die |
| CN212704108U (en) * | 2020-06-09 | 2021-03-16 | 江西省世宇金属制品有限责任公司 | Stamping device is used in processing of high added value, special properties steel, alloy product |
| CN111834076A (en) * | 2020-07-27 | 2020-10-27 | 宁波美固力磁电有限公司 | Preparation method of high-performance hot-pressed neodymium iron boron magnetic steel |
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