CN116504524A - Die for improving uniformity of neodymium iron boron pressed powder based on axial compression and pressing method - Google Patents
Die for improving uniformity of neodymium iron boron pressed powder based on axial compression and pressing method Download PDFInfo
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- CN116504524A CN116504524A CN202310631960.7A CN202310631960A CN116504524A CN 116504524 A CN116504524 A CN 116504524A CN 202310631960 A CN202310631960 A CN 202310631960A CN 116504524 A CN116504524 A CN 116504524A
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- axial compression
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- 238000007906 compression Methods 0.000 title claims abstract description 70
- 230000006835 compression Effects 0.000 title claims abstract description 69
- 238000003825 pressing Methods 0.000 title claims abstract description 58
- 229910001172 neodymium magnet Inorganic materials 0.000 title claims abstract description 57
- 239000000843 powder Substances 0.000 title claims abstract description 46
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000006247 magnetic powder Substances 0.000 claims description 13
- 238000000465 moulding Methods 0.000 claims description 11
- 230000001629 suppression Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 abstract description 11
- 239000002245 particle Substances 0.000 description 6
- 238000005245 sintering Methods 0.000 description 6
- 238000007493 shaping process Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 210000001161 mammalian embryo Anatomy 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009694 cold isostatic pressing Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000462 isostatic pressing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000009702 powder compression Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000009461 vacuum packaging Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- H01F1/0576—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 pressed, e.g. hot working
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Powder Metallurgy (AREA)
Abstract
Aiming at the technical problems that in the prior art, the density distribution of a pressed blank is uneven due to uneven friction resistance, uneven magnetic field distribution and the like in the pressing orientation process of a sintered neodymium iron boron magnet, so that the magnetic property and the mechanical property of a final magnet are reduced, the invention provides a die and a pressing method for improving the uniformity of neodymium iron boron pressed powder based on axial compression.
Description
Technical Field
The invention relates to the technical field of rare earth neodymium iron boron magnets, in particular to a die for improving uniformity of neodymium iron boron pressed powder based on axial compression and a pressing method.
Background
The neodymium-iron-boron permanent magnet is used as a third-generation rare earth permanent magnet material, and is widely applied to the fields of electronics, medical appliances, aerospace, wind power generation, electric automobiles and the like due to the excellent magnetic property. According to the preparation method, the method can be divided into bonding NdFeB and sintering NdFeB. At present, the sintered NdFeB magnet is mainly produced by adopting a powder metallurgy process, and the magnetic powder compression molding is an important process in the preparation process of the sintered NdFeB magnet, so that the magnetic property and the mechanical property of the magnet can be directly influenced by the compression effect of the pressed compact.
The Chinese patent publication No. CN112475291A discloses a side pressure male die molding opposite sintering neodymium iron boron mould, including last die assembly, lower die assembly, die and coil, go up die assembly and include cope match-plate pattern, upper slide fixed plate and upper punch, lower die assembly includes die template, regulating part and lower punch, and the lower punch that one end extends to in the die cooperates into the shaping die cavity with the die, and the powder that waits to suppress is located between upper punch and the lower punch, and the upper punch drives the lower slide into the shaping die cavity under the press and suppresses the powder, and the one end that the die kept away from the upper punch is equipped with the floating plate, and the one end that the floating plate is close to the cope match-plate pattern is equipped with the slider down, is equipped with on the side that the slider is close to the die down, and the side pressure male die is driven down to slide into the shaping die cavity under the slider and suppresses, and the magnetic field orientation of coil is unanimous with the axial of die.
The disadvantage of the above patent is that uneven stress of the magnetic powder particles is caused by uneven friction resistance and magnetic field distribution in the process of pressing and orienting neodymium iron boron powder, friction force between the wall of the forming cavity and the powder particles hinders the flow of the magnetic powder particles, so that the density of the magnetic powder distributed on the outer side of the pressed blank is larger, the density of the magnetic powder in the inner part of the pressed blank is smaller, the density of the two ends of the cylindrical pressed blank is larger than the density of the middle section of the pressed blank due to the larger magnetic field intensity near the electrified coil, and the uneven pressing of the pressed blank directly causes the magnetic property and mechanical property of the magnet to be reduced.
Based on the above, how to further optimize the orientation press forming method so that the magnetic powder particles in the neodymium iron boron pressed blank can be distributed more uniformly, and further improve the magnetic performance of the magnet is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
Aiming at the technical problems that in the prior art, uneven distribution of magnetic powder particles is caused by uneven friction resistance, uneven magnetic field distribution and the like in the pressing orientation process of a sintered NdFeB magnet, so that the magnetic performance and mechanical performance of the magnet are reduced, the invention provides a die and a pressing method for improving the uniformity of NdFeB pressed powder based on axial compression.
In order to achieve the above object, the present invention adopts the following technical scheme.
The utility model provides a mould and suppression method based on axial compression improves neodymium iron boron pressed powder homogeneity, including last mould, lower mould, spring pressure subassembly, slide wedge lower pressure post, axial compression post, short baffle, long baffle, limiting plate and extension spring, its characterized in that, spring pressure subassembly includes drum, spring and circular baffle, the one end of axial compression post is the die cavity with last mould, the cooperation of lower mould, the neodymium iron boron powder that waits to compress is located between last mould and the lower mould, spring pressure device is above last mould, the press promotes circular baffle and compresses the spring downwards, the spring makes drum end lower pressure mould, the last mould then suppresses the powder, after last lower mould is in place, circular baffle will contact the upper end of slide wedge lower pressure post to make its downward movement, and the slide wedge structure of lower extreme will make axial compression post be close to the centre of mould, axially compresses neodymium iron boron powder simultaneously.
For convenience of explanation, the x direction, the y direction and the z direction are defined on the sintered anisotropic rare earth neodymium iron boron permanent magnet shown in fig. 1, wherein the x direction is the axial compression direction, the z direction is the vertical compression direction, and the y is the radial direction.
There are two general ways to press sintered neodymium iron boron powder: parallel molding in which the pressure direction is parallel to the magnetic field direction and perpendicular molding in which the pressure direction is perpendicular to the magnetic field direction, whereas the degree of orientation of the magnetic powder by vertical orientation molding and isostatic pressing is relatively less affected by the magnetic field density ratio. Defects such as blank pressing fracture, edge missing and corner falling, even internal cracks and the like often occur in the actual production process of sintered NdFeB. The method is characterized in that the neodymium iron boron powder has factors such as uneven friction resistance and magnetic field distribution in the compression molding process, which are unfavorable for molding, so that the density and internal stress distribution of the pressed blank are uneven. Although the neodymium iron boron pressed blanks with obvious defects such as fracture, unfilled corners and the like can be removed through preliminary screening, the problem of uneven density distribution of the pressed blanks still exists, and the reduction of the yield and the reduction of the magnetic performance of the products can be caused. Based on the above problems, the manufacturing process of the general sintered neodymium-iron-boron magnet comprises the following steps: adding neodymium iron boron powder with certain mass into a mould, pressing by a press, applying a pulse magnetic field to the powder, applying a demagnetizing field after the pressing is finished, packaging a pressed blank by using a clean plastic film, performing plastic packaging in a vacuum packaging machine, performing cold isostatic pressing on the pressed blank, and sintering and magnetizing. The problem is that uneven stress of magnetic powder particles can be caused by uneven friction resistance, uneven magnetic field distribution and the like in the neodymium iron boron pressing orientation process, so that the density of the magnetic powder distributed on the outer side is larger, the density of the magnetic powder in the inner part is smaller, and uneven pressing of a pressed blank can directly lead to the reduction of the magnetic property and the mechanical property of a magnet.
The utility model provides a mould and suppression method based on axial compression improves neodymium iron boron pressed powder homogeneity, can shaping density distribution homogeneity have the neodymium iron boron pressed embryo that obtains promoting, set up the coil on the outside certain distance of long baffle, the magnetic field orientation that the coil produced is unanimous with lower mould axial, and the press pressure head moves down, drives the circular baffle among the spring pressure subassembly and compresses the spring downwards, and the spring makes the drum end lower upper mould, go up the mould then the powder suppresses, and after upper and lower mould pressing is in place, the circular baffle will contact the slide wedge pushes down the upper end of post to make its downward movement, and the slide wedge structure of lower extreme will make axial compression post be close to the mould centre, carries out axial compression simultaneously to neodymium iron boron powder, for further guaranteeing to press embryo atress even, axial compression post is in mould both sides symmetrical arrangement two, so can effectively avoid because of pressing the technical problem that the magnetic property and the mechanical property of the inhomogeneous magnet that causes of embryo density decline.
Preferably, the two axial compression columns are respectively positioned at two sides of the die, the column body parts of the two axial compression columns are in small clearance fit with holes in the middle of the long baffle plates at two sides, and two side surfaces of the inclined wedge structure in the axial compression columns are in sliding fit with the limiting plates. According to the technical scheme, the matching mode of the axial compression column and the long baffle is limited, and after the neodymium iron boron powder is vertically compacted, the axial compression column simultaneously presses the neodymium iron boron powder along the axis direction of the lower die.
Preferably, the wedge pressing column comprises a driving inclined plane, the axial compression column comprises a driven inclined plane, the driving inclined plane at the lower end of the wedge pressing column is consistent with the driven inclined plane at the tail end of the axial compression column in inclination angle and is mutually attached, the driving inclined plane is positioned at one side of the wedge pressing column close to the forming cavity, and the driven inclined plane is positioned at one side of the axial compression column far away from the forming cavity. According to the technical scheme, the matching mode of the wedge pressing column and the axial compression column is limited, the wedge pressing column moves downwards, and the axial compression columns on two sides of the die are simultaneously close to the middle of the die.
Preferably, the two limiting plates are respectively fixed on the long baffle plates at two sides of the die and are in sliding fit with one side, far away from the forming cavity, of the lower end of the wedge pressing column. The limiting plate in the application can ensure that the inclined plane of the lower end of the wedge pressing column is tightly attached to the inclined plane of the tail end of the axial compression column, so that the wedge structure is kept in a stable state.
Preferably, the spring pressure assembly comprises a cylinder, a spring and a circular baffle, wherein two ends of the spring are respectively fixed on the cylinder and the circular baffle, the circular baffle is in clearance fit with the cylinder, and the upper cylinder of the wedge pressing column is in clearance fit connection with the cylinder from below. The spring pressure assembly is utilized to realize the operation of firstly vertically compacting the NdFeB powder and then axially compressing the powder.
Preferably, two ends of the tension spring are respectively fixed on the limiting plate and the axial compression column through bolt connection, so that the inclined surface at the tail end of the axial compression column clings to the limiting plate. The extension spring in this application can guarantee before perpendicular compaction neodymium iron boron powder that axial compression post can not remove to the mould centre in advance.
In summary, the invention has the following beneficial effects: (1) The neodymium iron boron blank pressing can be formed, the density distribution uniformity is improved, and the magnetic performance of the final magnet can be improved; (2) The uniformity of the density of the neodymium iron boron pressed blank is improved, so that the defects of fracture, unfilled corners and the like can be reduced, and the yield of the magnet is increased; (3) Can be directly improved on the basis of a common neodymium iron boron powder pressing die, and can greatly reduce the production cost; (4) Because the spring pressure assembly and the cam hold-down post can be used continuously, no rotation is required, and therefore, the required number is small.
Drawings
Fig. 1 is a schematic diagram of a cylindrical sintered neodymium-iron-boron magnet prepared according to the invention.
Fig. 2 is a schematic view of an axial compression structure of the present invention.
Fig. 3 is an elevation view of a die for preparing a green compact of a cylindrical sintered neodymium-iron-boron magnet according to the invention.
Fig. 4 is a top view of an embodiment of the green compact die for preparing a cylindrical sintered neodymium-iron-boron magnet according to the present invention.
Fig. 5 is an illustration of an embodiment of a die for preparing cylindrical sintered neodymium-iron-boron magnet green compact according to the present invention.
In the figure: spring 1, circular baffle 2, forming cavity 3, slide wedge lower pressure post 4, drive inclined plane 5, upper mould 6, lower mould 7, powder 8, indent 9, axial compression post 10, passive inclined plane 11, coil 12, long baffle 13, short baffle 14, drum 15, limiting plate 16, extension spring 17.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
The following examples are compressible 7 cylindrical compacts at a time, but are merely illustrative of the invention and are not to be construed as limiting the invention.
Examples: as shown in fig. 1 to 5, the die and the pressing method for improving uniformity of neodymium iron boron pressed powder based on axial compression comprise an upper die 6, a lower die 7, a spring pressure component, a wedge lower pressing column 4, an axial compression column 10, a short baffle 13, a long baffle 13, a limiting plate 16 and a tension spring 17, and are characterized in that the spring pressure component comprises a cylinder 15, a spring 1 and a round baffle 2, one end of the axial compression column 10 is matched with the upper die 6 and the lower die 7 to form a forming cavity 3, neodymium iron boron powder 8 to be pressed is positioned between the upper die 6 and the lower die 7, the spring pressure device is arranged at the upper end of the upper die 6, the press pushes the round baffle 2 to compress the spring 1 downwards, the spring 1 presses the upper die 6 at the tail end of the cylinder 15, the upper die 6 presses the powder 8, after the upper die and the lower die are pressed in place, the round baffle 2 contacts with the upper end of the wedge lower pressing column 4 and moves downwards, and the wedge structure at the lower end makes the axial compression column 10 approach the middle of the die, and simultaneously compresses the neodymium iron boron powder axially; two axial compression columns 1010 are respectively positioned at two sides of the die, the convex parts of the two axial compression columns are mutually attached to the holes in the middle of the long baffle plates 13 at two sides, and the two side surfaces of the inclined wedge structure at the tail ends of the compression columns are attached to the limiting plates 16; the wedge pressing column 4 comprises a driving inclined plane 5, the axial compression column 10 comprises a driven inclined plane 11, the driving inclined plane 5 at the lower end of the wedge pressing column 4 is consistent with the driven inclined plane 11 at the tail end of the axial compression column 10 in inclination angle and is mutually attached, the driving inclined plane 5 is positioned at one side of the wedge pressing column 4 close to the forming cavity 3, and the driven inclined plane 11 is positioned at one side of the axial compression column 10 far away from the forming cavity 3; the limiting plates 16 are fixed on the long baffle plates 13 at two sides of the die and are attached to one side, far away from the forming cavity 3, of the lower end of the wedge pressing column 4; the spring 1 pressure assembly comprises a cylinder 15, a spring 1 and a circular baffle plate 2, wherein two ends of the spring 1 are respectively fixed on the cylinder 15 and the circular baffle plate 2, the circular baffle plate 2 is in clearance fit with the cylinder 15, and the upper end cylinder of the wedge pressing column 4 is in clearance fit connection with the cylinder 15 from below; the two ends of the tension spring 17 are respectively fixed on the limiting plate 16 and the axial compression column 10 through bolt connection, so that the inclined surface of the tail end of the axial compression column 10 clings to the limiting plate 16.
In the embodiment, the hydrogen crushing treatment adopts an HD hydrogen crushing process; the strong magnetic field orientation molding technology is adopted in the process of magnetic field orientation; the sintering in the vacuum sintering furnace adopts a fully-sealed high-vacuum gas quenching sintering process.
As shown in fig. 3, the top is a spring 1 pressure component, the spring 1 pressure component comprises a cylinder 15, a spring 1 and a circular baffle plate 2, two ends of the spring 1 are respectively fixed on the cylinder 15 and the circular baffle plate 2, the circular baffle plate 2 is in clearance fit with the cylinder 15, and the upper end cylinder of the wedge lower pressing column 4 is in clearance fit connection with the cylinder 15 from below; the press pushes the circular baffle plate 2 to compress the spring 1 downwards, the spring 1 enables the tail end of the cylinder 15 to press the upper die 6, the upper die 6 presses the powder 8, and after the upper die 7 and the lower die 7 are pressed in place, the circular baffle plate 2 is contacted with the upper end of the inclined wedge pressing column 4 and moves downwards.
As shown in fig. 4, in this embodiment, seven molding cavities 3 are provided on the lower die 7, the molding cavities 3 are cylindrical, and the length direction of the molding cavities 3 is arranged along the moving direction of the axial compression column 10. As shown in fig. 5, taking the wedge structure located on the right side of the wedge pressing column 4 as an example, the wedge pressing column 4 includes a driving inclined plane 5 on the left side, the driving inclined plane 5 inclines from the upper left to the lower right, the axial compression column 10 includes a passive inclined plane 11 on the right side, the passive side inclines from the upper left to the lower right, the driving inclined plane 5 and the passive side contact and cooperate, the wedge pressing column 4 moves downward, and the wedge structure at the lower end thereof makes the axial compression column 10 approach to the middle of the die, so as to axially compress neodymium iron boron powder.
Claims (9)
1. The utility model provides a mould and suppression method based on axial compression improves neodymium iron boron pressed powder homogeneity, includes mould, lower mould, spring pressure subassembly, slide wedge lower pressure post, axial compression post, short baffle, long baffle, limiting plate and extension spring, its characterized in that, spring pressure subassembly includes drum, spring and circular baffle, and axial compression post's one end is the molding cavity with last mould, lower mould cooperation, and the neodymium iron boron powder that waits to press is located between last mould and the lower mould, and spring pressure device is located the top of last mould.
2. The die and the pressing method for improving uniformity of neodymium iron boron pressed powder based on axial compression according to claim 1, wherein the pressing method is characterized in that a pressing machine pushes a circular baffle plate to compress a spring downwards, the spring enables the tail end of a cylinder to press a die, the upper die presses powder, after the upper die and the lower die are pressed in place, the circular baffle plate is contacted with the upper end of a wedge lower pressing column and moves downwards, and a wedge structure at the lower end enables the axial compression column to approach towards the middle of the die, so that neodymium iron boron powder is axially compressed at the same time.
3. The die and the pressing method for improving the uniformity of neodymium iron boron pressed powder based on axial compression according to claims 1 and 2 are characterized in that an inclined wedge structure of the inclined wedge pressing column forms an included angle alpha (smaller than 90 degrees) with a horizontal angle, and the pressing amount of the inclined wedge pressing column is as followsL(mm), compression amount of axial compression column at one endd(mm) and total axial compressionD(mm) satisfies the following relationship: d=l·cotα; d=2·d.
4. The die and pressing method for improving uniformity of neodymium iron boron pressed powder based on axial compression according to claims 1 and 2, wherein after the neodymium iron boron powder is filled into the die and is closed, the coil is electrified for 2 times or more, magnetic field impact orientation is performed on the magnetic powder in the die cavity, then the magnetic field is kept unchanged or intermittent electrification of the coil is continued, and the press is started to press and shape the magnetic powder.
5. The die and the pressing method for improving the uniformity of neodymium iron boron pressed powder based on axial compression according to claim 1 are characterized in that two axial compression columns are respectively positioned at two sides of the die, the column body parts of the two axial compression columns are in small clearance fit with holes in the middle of long baffles at two sides, and two side surfaces of a wedge structure in the axial compression columns are in sliding fit with a limiting plate.
6. The die and the pressing method for improving uniformity of neodymium iron boron pressed powder based on axial compression according to claim 2, wherein the inclined wedge pressing column comprises a driving inclined plane, the axial compression column comprises a passive inclined plane, the driving inclined plane at the lower end of the inclined wedge pressing column is consistent with and is mutually attached to the passive inclined plane at the tail end of the axial compression column, the driving inclined plane is positioned at one side of the inclined wedge pressing column close to the forming cavity, and the passive inclined plane is positioned at one side of the axial compression column far away from the forming cavity.
7. The die and the pressing method for improving the uniformity of neodymium iron boron pressed powder based on axial compression according to claim 6, wherein the two limiting plates are respectively fixed on the long baffle plates at two sides of the die and are in sliding fit with one side, far away from the forming cavity, of the lower end of the wedge lower pressing column.
8. The die for improving uniformity of neodymium iron boron pressed powder and the pressing method thereof based on axial compression according to claim 1, wherein the spring pressure assembly comprises a cylinder, a spring and a circular baffle plate, two ends of the spring are respectively fixed on the cylinder and the circular baffle plate, the circular baffle plate is in clearance fit with the cylinder, and an upper end cylinder of a wedge lower pressing column is in clearance fit connection with the cylinder from below.
9. The die and the pressing method for improving the uniformity of neodymium iron boron pressed powder based on axial compression according to claim 6, wherein two ends of the tension spring are respectively fixed on the limiting plate and the axial compression column through bolt connection, so that the inclined surface of the tail end of the axial compression column is clung to the limiting plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310631960.7A CN116504524A (en) | 2023-05-31 | 2023-05-31 | Die for improving uniformity of neodymium iron boron pressed powder based on axial compression and pressing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310631960.7A CN116504524A (en) | 2023-05-31 | 2023-05-31 | Die for improving uniformity of neodymium iron boron pressed powder based on axial compression and pressing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116504524A true CN116504524A (en) | 2023-07-28 |
Family
ID=87328461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310631960.7A Pending CN116504524A (en) | 2023-05-31 | 2023-05-31 | Die for improving uniformity of neodymium iron boron pressed powder based on axial compression and pressing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116504524A (en) |
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2023
- 2023-05-31 CN CN202310631960.7A patent/CN116504524A/en active Pending
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