CN112164572B - Compression molding process of neodymium iron boron product - Google Patents
Compression molding process of neodymium iron boron product Download PDFInfo
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- CN112164572B CN112164572B CN202010912665.5A CN202010912665A CN112164572B CN 112164572 B CN112164572 B CN 112164572B CN 202010912665 A CN202010912665 A CN 202010912665A CN 112164572 B CN112164572 B CN 112164572B
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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
- H01F41/0266—Moulding; Pressing
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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
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
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- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention belongs to the technical field of compression molding processes, and particularly discloses a compression molding process of a neodymium iron boron product, which comprises a neodymium iron boron raw material and compression molding equipment, wherein the compression molding equipment comprises a grinding device and an extrusion device; grinding the neodymium iron boron raw material in a grinding device to obtain neodymium iron boron raw material powder with the average particle size of 0.1-5 mm; then placing the ground neodymium iron boron raw material powder into an extrusion device, and extruding the neodymium iron boron raw material powder for 4-10s through the extrusion device to obtain a neodymium iron boron magnet pressed blank; sintering the obtained neodymium iron boron magnet pressed blank to obtain a neodymium iron boron magnet; the process enables the neodymium iron boron magnet pressed blank to be directly packed and sintered without waiting for static pressure treatment, reduces production steps and improves production efficiency.
Description
Technical Field
The invention relates to a compression molding process of a neodymium iron boron product, and belongs to the technical field of compression molding processes.
Background
Neodymium iron boron magnet is also called neodymium magnet (Neodymiummagnet), and its chemical formula is Nd2Fe14B, which is an artificial permanent magnet and is also the permanent magnet with the strongest magnetic force so far; in the manufacturing process of the existing neodymium iron boron magnet, the grinding fineness of raw materials cannot be guaranteed due to the grinding of the raw materials, so that the particle size of raw material particles cannot be reduced, and the high-performance neodymium iron boron magnet cannot be obtained; in addition, for the pressing process of the ground powdery raw material, the uniformity of the density of the neodymium iron boron magnet obtained after pressing cannot be ensured, and the density of the pressed neodymium iron boron magnet is not high enough; therefore, the press forming process of the neodymium iron boron product is provided to solve the problems.
Disclosure of Invention
The invention aims to provide a compression molding process of a neodymium iron boron product, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a compression molding process of a neodymium iron boron product comprises the following steps:
s1: preparing neodymium iron boron raw materials according to requirements, placing the neodymium iron boron raw materials in a compression molding device for grinding, wherein the rotating speed of a grinding motor is 4000-;
s2: placing the powder obtained in the step S1 in a compression molding device, and extruding for 4-10S to obtain a neodymium iron boron magnet pressed blank; the density of the neodymium iron boron magnet compact is 3.5-5g/cm3；
S3: and (3) placing the neodymium iron boron magnet pressed compact in the S2 in a high-temperature sintering furnace for sintering treatment to obtain the neodymium iron boron magnet, wherein the sintering temperature is 1000-1200 ℃, and the sintering time is 3-5 h.
Preferably, the protective gas is nitrogen.
Preferably, the compression molding equipment comprises a sealing box, a grinding device and an extrusion device, and a sealing door is arranged on the front surface of the sealing box; the grinding device is arranged at the top of the inner side of the seal box; the extrusion device is arranged at the bottom of the inner side of the seal box.
Preferably, the grinding device comprises a grinding box, an electric telescopic rod, a grinding motor and an inverted cone-shaped grinding plate, the grinding box is fixed at the top of the inner side of the sealing box, feed pipes are fixed on two sides of the grinding box, the feed pipes are communicated with the top of the inner side of the sealing box, and feed hoppers are arranged at communication holes; the periphery of the grinding box is provided with a screen; the outside of grinding case is located screen cloth department and is provided with the storage case, and the bottom of storage case is connected with a plurality of row's material pipes.
Preferably, the bottom of the inner side of the grinding box is provided with a conical seat, and the surface of the conical seat and the bottom of the inverted conical grinding plate are provided with a plurality of grinding bulges.
Preferably, an electric telescopic rod is fixed at the top of the inner side of the grinding box, an installation plate is fixed at the bottom end of the electric telescopic rod, a grinding motor is fixed on the installation plate, an output shaft is fixed at the output end of the grinding motor, and an inverted conical grinding plate is fixed on the output shaft.
Preferably, the extrusion device comprises an L-shaped assembly, a first pushing plate, a second pushing plate, a connecting plate, a sealing plate, a first cylinder and a second cylinder, and the sealing plate is fixedly connected with the inner walls of the periphery of the sealing box; the number of the L-shaped assemblies is four, the end faces of two sides of each L-shaped assembly are provided with accommodating grooves, and the inner walls of the accommodating grooves are provided with limiting sliding grooves; be provided with the connecting plate between adjacent "L" type subassembly, the both ends of connecting plate are inserted and are established and accomodate the inslot and the both ends of connecting plate are fixed with spacing slider, spacing slider and spacing spout sliding connection.
Preferably, a folding plate is arranged between the adjacent L-shaped components at the top or the bottom of the connecting plate.
Preferably, first air cylinders are fixed on the inner wall of the seal box and positioned at the left side and the right side of the extrusion device, push rods are fixed at the output ends of the first air cylinders, first push plates are fixed on the push rods, and moving through grooves are formed in the first push plates; the inner wall of seal box is located extrusion device's front and back both sides department and is fixed with the second cylinder, and the output of second cylinder is fixed with the push rod, and the one end of push rod is fixed with the second and bulldozes the board, and the both ends that the second bulldozed the board alternate in the groove that removes.
Preferably, the sealing plate is connected with a communicating pipe, and the peripheral side wall of the communicating pipe is connected with the discharging pipe.
Compared with the prior art, the invention has the beneficial effects that:
according to the compression molding process of the neodymium iron boron product, the screen meshes are arranged on the periphery of the grinding box, so that the particle size of the ground neodymium iron boron powder particles can be ensured to be 0.1-5mm, and the neodymium iron boron magnet has the characteristic of high performance.
The compression device is arranged to apply pressure to the neodymium iron boron powder in four directions, namely front, back, left and right directions, so that the neodymium iron boron powder is uniformly stressed, the application force of the neodymium iron boron powder is further ensured, the neodymium iron boron magnet pressed blank does not need to wait for static pressure treatment, the neodymium iron boron magnet pressed blank can be directly packed and sintered, the production steps are reduced, and the production efficiency is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic view of the connection structure of the L-shaped assembly and the connecting plate.
Fig. 3 is a schematic diagram of a first push plate structure.
In the figure: 1. a sealing box; 2. grinding a box; 3. an electric telescopic rod; 4. grinding the motor; 5. an inverted conical lapping plate; 6. a feed pipe; 7. a feed hopper; 8. screening a screen; 9. a material storage box; 10. a discharge pipe; 11. a conical seat; 12. grinding the bumps; 13. mounting a plate; 14. an "L" shaped component; 1401. a receiving groove; 1402. a limiting chute; 15. a first push plate; 1501. moving the through groove; 16. a second push plate; 17. a connecting plate; 18. a sealing plate; 19. a first cylinder; 20. a second cylinder; 21. a limiting slide block; 22. folding the board; 23. a communication pipe is provided.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1-3, the present invention provides a technical solution: a compression molding process of a neodymium iron boron product comprises the following steps:
s1: preparing a neodymium iron boron raw material according to requirements, placing the neodymium iron boron raw material into a compression molding device for grinding, wherein the rotating speed of a grinding motor 4 is 4000-6000rmp, and meanwhile, the compression molding device is fully filled with protective gas for 5-10min to obtain neodymium iron boron raw material powder with the average grain diameter of 0.1-5 mm;
s2: the powder obtained in S1 was placed in a pressExtruding for 4-10s in the forming device to obtain a neodymium iron boron magnet pressed blank; the density of the neodymium iron boron magnet compact is 3.5-5g/cm3；
S3: and (3) placing the neodymium iron boron magnet pressed compact in the S2 in a high-temperature sintering furnace for sintering treatment to obtain the neodymium iron boron magnet, wherein the sintering temperature is 1000-1200 ℃, and the sintering time is 3-5 h.
Further, the protective gas is nitrogen.
Further, the compression molding equipment comprises a sealing box 1, a grinding device and an extrusion device, wherein a sealing door is arranged on the front surface of the sealing box 1; the grinding device is arranged at the top of the inner side of the seal box 1; the extrusion device is arranged at the bottom of the inner side of the seal box 1.
Further, the grinding device comprises a grinding box 2, an electric telescopic rod 3, a grinding motor 4 and an inverted cone-shaped grinding plate 5, wherein the grinding box 2 is fixed at the top of the inner side of the sealing box 1, feed pipes 6 are fixed on two sides of the grinding box 2, the feed pipes 6 are communicated with the top of the inner side of the sealing box 1, and feed hoppers 7 are arranged at communication holes; the periphery of the grinding box 2 is provided with a screen 8; the outer side of the grinding box 2 is provided with a material storage box 9 at the position of the screen 8, and the bottom of the material storage box 9 is connected with a plurality of material discharge pipes 10.
Further, the bottom of the inner side of the grinding box 2 is provided with a conical seat 11, and the surface of the conical seat 11 and the bottom of the inverted conical grinding plate 5 are provided with a plurality of grinding protrusions 12.
Furthermore, an electric telescopic rod 3 is fixed at the top of the inner side of the grinding box 2, a mounting plate 13 is fixed at the bottom end of the electric telescopic rod 3, a grinding motor 4 is fixed on the mounting plate 13, an output shaft is fixed at the output end of the grinding motor 4, and an inverted cone-shaped grinding plate 5 is fixed on the output shaft.
Further, the extrusion device comprises an L-shaped assembly 14, a first pushing plate 15, a second pushing plate 16, a connecting plate 17, a sealing plate 18, a first air cylinder 19 and a second air cylinder 20, wherein the sealing plate 18 is fixedly connected with the inner wall of the periphery of the sealing box 1; the number of the L-shaped assemblies 14 is four, the two side end faces of each L-shaped assembly 14 are provided with a containing groove 1401, and the inner wall of each containing groove 1401 is provided with a limiting sliding groove 1402; a connecting plate 17 is arranged between the adjacent L-shaped assemblies 14, two ends of the connecting plate 17 are inserted into the accommodating groove 1401, two ends of the connecting plate 17 are fixed with limiting sliding blocks 21, and the limiting sliding blocks 21 are connected with the limiting sliding grooves 1402 in a sliding mode.
Further, a folding plate 22 is provided between adjacent said "L" shaped members 14 at the top or bottom of the connecting plate 17.
Further, a first air cylinder 19 is fixed on the inner wall of the seal box 1 at the left side and the right side of the extrusion device, a push rod is fixed at the output end of the first air cylinder 19, a first push plate 15 is fixed on the push rod, and a moving through groove 1501 is formed in the first push plate 15; the inner wall of the seal box 1 is fixed with second cylinders 20 at the front and back sides of the extrusion device, the output end of the second cylinder 20 is fixed with a push rod, one end of the push rod is fixed with a second pushing plate 16, and the two ends of the second pushing plate 16 are inserted into the moving through groove 1501.
Furthermore, the sealing plate 18 is connected with a communicating pipe 23, and the peripheral side wall of the communicating pipe 23 is connected with the discharging pipe 10.
Further, an inflation tube is arranged on the seal box 1, and a valve is arranged on the inflation tube; the seal box 1 is a transparent glass box.
The working principle is as follows: the invention relates to a compression molding process of a neodymium iron boron product, which comprises the steps of firstly filling nitrogen into a sealing box 1 through an inflation tube, closing a valve after the nitrogen is filled, then putting a neodymium iron boron raw material into a grinding box 1 through a feed hopper 7 and a feed tube 6, then starting an electric telescopic rod 3, enabling the electric telescopic rod 3 to drive a mounting plate 13 to move downwards, further driving a grinding motor 4 and an inverted cone-shaped grinding plate 5 to move downwards, enabling the inverted cone-shaped grinding plate 5 to be in contact with a conical seat 11, then starting the grinding motor 4, enabling the grinding motor 4 to drive the inverted cone-shaped grinding plate 5 to rotate, realizing the function of grinding the neodymium iron boron raw material into powder under the action of a grinding bulge 12, accumulating the powdery neodymium iron boron raw material near a screen 8 under the action of an inclined plane of the conical seat 11, and enabling the powdery neodymium iron boron raw material to enter the storage box 1 through the screen 8 when the neodymium iron boron raw material is ground to have a particle size of 0.01-5mm, under the action of the discharge pipe 10, enters the communicating pipe 23 and further enters the extrusion device.
When all are in powder formAfter the neodymium iron boron raw material enters the extrusion device, the first cylinder 19 and the second cylinder 20 are started simultaneously, the first cylinder 19 drives the first pushing plate 15 to extrude L-shaped assemblies 14 on the left side and the right side through the push rod, the second cylinder 20 drives the second pushing plate 16 to extrude the L-shaped assemblies 14 on the front side and the rear side through the push rod, so that the connecting plate 17 is contracted into the accommodating groove 1401, the powdered neodymium iron boron raw material is further extruded, the powdered neodymium iron boron raw material can be prevented from overflowing under the action of the bottom of the sealing box 1, the folding plate 22 and the sealing plate 18, the extrusion time is ensured to be 4-10s, the powdered neodymium iron boron raw material can be extruded into a neodymium iron boron magnet pressed blank, and the density of the neodymium iron boron magnet pressed blank is ensured to be 3.5-5g/cm3The neodymium iron boron magnet pressed blank does not need to wait for static pressure treatment, can be directly packed and sintered, reduces production steps and improves production efficiency.
It is worth noting that: the whole device realizes control over the device through the master control button, and the device matched with the control button is common equipment, belongs to the existing mature technology, and is not repeated for the electrical connection relation and the specific circuit structure.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A compression molding process of a neodymium iron boron product is characterized in that: the method comprises the following steps:
s1: preparing neodymium iron boron raw materials according to requirements, placing the neodymium iron boron raw materials into a pressing forming device for grinding, wherein the rotating speed of a grinding motor (4) is 4000-6000rmp, and meanwhile, ensuring that the pressing forming device is filled with protective gas, and the grinding time is 5-10min, so that neodymium iron boron raw material powder with the average grain diameter of 0.1-5mm is obtained;
s2: placing the powder obtained in the step S1 in a compression molding device, and extruding for 4-10S to obtain a neodymium iron boron magnet pressed blank; the density of the neodymium iron boron magnet pressed compact is 3.5-5g/cm3；
S3: placing the neodymium iron boron magnet pressed blank in the S2 in a high-temperature sintering furnace for sintering treatment to obtain the neodymium iron boron magnet, wherein the sintering temperature is 1000-1200 ℃, and the sintering time is 3-5 h;
the compression molding equipment comprises a sealing box (1), a grinding device and an extrusion device, wherein a sealing door is arranged on the front surface of the sealing box (1); the grinding device is arranged at the top of the inner side of the seal box (1); the extrusion device is arranged at the bottom of the inner side of the seal box (1);
the grinding device comprises a grinding box (2), an electric telescopic rod (3), a grinding motor (4) and an inverted cone-shaped grinding plate (5), wherein the grinding box (2) is fixed at the top of the inner side of the sealing box (1), feed pipes (6) are fixed on two sides of the grinding box (2), the feed pipes (6) are communicated with the top of the inner side of the sealing box (1), and feed hoppers (7) are arranged at communication holes; the periphery of the grinding box (2) is provided with a screen (8); a material storage box (9) is arranged at the position of the screen (8) on the outer side of the grinding box (2), and the bottom of the material storage box (9) is connected with a plurality of material discharging pipes (10); the bottom of the inner side of the grinding box (2) is provided with a conical seat (11), and the surface of the conical seat (11) and the bottom of the inverted conical grinding plate (5) are provided with a plurality of grinding bulges (12); an electric telescopic rod (3) is fixed at the top of the inner side of the grinding box (2), a mounting plate (13) is fixed at the bottom end of the electric telescopic rod (3), a grinding motor (4) is fixed on the mounting plate (13), an output shaft is fixed at the output end of the grinding motor (4), and an inverted cone-shaped grinding plate (5) is fixed on the output shaft;
the extrusion device comprises an L-shaped assembly (14), a first pushing plate (15), a second pushing plate (16), a connecting plate (17), a sealing plate (18), a first air cylinder (19) and a second air cylinder (20), wherein the sealing plate (18) is fixedly connected with the inner wall of the periphery of the sealing box (1); the number of the L-shaped assemblies (14) is four, the end faces of two sides of each L-shaped assembly (14) are provided with accommodating grooves (1401), and the inner walls of the accommodating grooves (1401) are provided with limiting sliding grooves (1402); a connecting plate (17) is arranged between the adjacent L-shaped components (14), two ends of the connecting plate (17) are inserted into the accommodating groove (1401), two ends of the connecting plate (17) are fixed with limiting sliding blocks (21), and the limiting sliding blocks (21) are connected with the limiting sliding grooves (1402) in a sliding manner;
a folding plate (22) is arranged between the adjacent L-shaped components (14) at the top or the bottom of the connecting plate (17);
first air cylinders (19) are fixed on the inner wall of the seal box (1) and positioned on the left side and the right side of the extrusion device, push rods are fixed at the output ends of the first air cylinders (19), first push plates (15) are fixed on the push rods, and moving through grooves (1501) are formed in the first push plates (15); the inner wall of seal box (1) is located extrusion device's front and back both sides department and is fixed with second cylinder (20), and the output of second cylinder (20) is fixed with the push rod, and the one end of push rod is fixed with second and bulldozes board (16), and the both ends that the second bulldozed board (16) alternate in removing logical groove (1501).
2. The press forming process of a neodymium iron boron product according to claim 1, characterized in that: the protective gas is nitrogen.
3. The press forming process of the neodymium iron boron product according to claim 1, characterized in that: the sealing plate (18) is connected with a communicating pipe (23), and the peripheral side wall of the communicating pipe (23) is connected with the discharging pipe (10).
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| CN114192776A (en) * | 2021-12-07 | 2022-03-18 | 葛安娜 | Preparation method of neodymium iron boron magnetic material |
| CN115036122B (en) * | 2022-04-27 | 2024-02-06 | 杭州永磁集团有限公司 | System and sample method for preparing samarium cobalt magnet with ultralow remanence temperature coefficient |
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| CN1410205A (en) * | 2001-09-21 | 2003-04-16 | 吴庆林 | Neodymium iron boron alloy powder deep processing technology |
| CN2855597Y (en) * | 2005-12-19 | 2007-01-10 | 北京有色金属研究总院 | Grinding and sieving machine |
| CN105575651A (en) * | 2016-03-01 | 2016-05-11 | 京磁材料科技股份有限公司 | Compression molding technology for neodymium iron boron magnet |
| CN110355374A (en) * | 2019-07-12 | 2019-10-22 | 长沙雾谷智能科技有限公司 | It is a kind of for manufacturing the grinding device and its working method of metal powder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4039779B2 (en) * | 1999-01-28 | 2008-01-30 | 太陽誘電株式会社 | Manufacturing method of chip-shaped electronic component |
| JP4391980B2 (en) * | 2005-11-07 | 2009-12-24 | インターメタリックス株式会社 | Manufacturing method and manufacturing apparatus for magnetic anisotropic rare earth sintered magnet |
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| CN1410205A (en) * | 2001-09-21 | 2003-04-16 | 吴庆林 | Neodymium iron boron alloy powder deep processing technology |
| CN2855597Y (en) * | 2005-12-19 | 2007-01-10 | 北京有色金属研究总院 | Grinding and sieving machine |
| CN105575651A (en) * | 2016-03-01 | 2016-05-11 | 京磁材料科技股份有限公司 | Compression molding technology for neodymium iron boron magnet |
| CN110355374A (en) * | 2019-07-12 | 2019-10-22 | 长沙雾谷智能科技有限公司 | It is a kind of for manufacturing the grinding device and its working method of metal powder |
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