CN114005632A - Large neodymium iron boron magnet ring or magnet cake and preparation method thereof - Google Patents
Large neodymium iron boron magnet ring or magnet cake and preparation method thereof Download PDFInfo
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- CN114005632A CN114005632A CN202111177438.3A CN202111177438A CN114005632A CN 114005632 A CN114005632 A CN 114005632A CN 202111177438 A CN202111177438 A CN 202111177438A CN 114005632 A CN114005632 A CN 114005632A
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- 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
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- 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
- H01F1/0573—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 obtained by reduction or by hydrogen decrepitation or embrittlement
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- 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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- H01F13/003—Methods and devices for magnetising permanent magnets
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- 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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- H01F7/02—Permanent magnets [PM]
- H01F7/0205—Magnetic circuits with PM in general
- H01F7/021—Construction of PM
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Abstract
The invention discloses a large neodymium iron boron magnetic ring or magnetic cake and a preparation method thereof, and the key points of the technical scheme are as follows: a large neodymium iron boron magnetic ring or magnetic cake is arranged in a round cake shape or a circular ring shape, and comprises the following elements in percentage by weight: PrNd: 29-31%, Dy: 0.5% -1%, GdFe: 0.3% -1%, Al: 0.1-0.5%, Cu: 0.1-0.5%, ZrFe: 0.1% -0.5%, Co: 0.1% -0.5%, B: 3% -10%, Fe: 55 to 63 percent, and the sum of the weight percent of the components is 100 percent. The invention realizes the convenience of compression molding the large neodymium iron boron magnetic ring or the magnetic cake, realizes the demolding of the large neodymium iron boron magnetic ring or the magnetic cake blank subjected to compression molding through the corresponding mold and the demolding transfer mechanism, and performs vacuum packaging in an oxygen-free environment, thereby avoiding the deformation or damage condition when preparing the large neodymium iron boron magnetic ring or the magnetic cake.
Description
Technical Field
The invention relates to the field of magnetic steel preparation, in particular to a large neodymium iron boron magnetic ring or magnetic cake and a preparation method thereof.
Background
The prior neodymium iron boron magnetic cake and magnetic ring are cylindrical or circular, the outer diameter is smaller, and the diameter is generally smaller than 100 mm. Due to the technical development, when a magnetic cake or magnetic ring with a large outer diameter (diameter larger than 200mm) needs to be used, the magnetic cake or magnetic ring with a large outer diameter is generally manufactured by manufacturing a plurality of parts which are spliced with each other and then assembling.
Because the prior art is difficult to realize mould pressing and transfer large-size magnetic cakes or magnetic rings, the whole magnetic cakes and magnetic rings after mould pressing are soft, and when the size is overlarge, the magnetic cakes and magnetic rings are easy to collapse and break when being overturned for carrying. In addition, when the prepared magnetic ring and the prepared magnetic cake are prepared according to the element proportion, the cracking deformation condition is easy to occur during sintering after the prepared magnetic ring and the prepared magnetic cake are enlarged in volume.
Therefore, there is a need for an improved structure that overcomes the above-mentioned deficiencies.
Disclosure of Invention
The invention aims to provide a large neodymium iron boron magnetic ring or magnetic cake and a preparation method thereof, which are convenient for compression molding of the large neodymium iron boron magnetic ring or magnetic cake, realize demolding of a green body of the large neodymium iron boron magnetic ring or magnetic cake subjected to compression molding through a corresponding mold and a demolding transfer mechanism, and perform vacuum packaging in an oxygen-free environment, so that the condition of deformation or damage during preparation of the large neodymium iron boron magnetic ring or magnetic cake is avoided
The technical purpose of the invention is realized by the following technical scheme: a large neodymium iron boron magnetic ring or magnetic cake is arranged in a round cake shape or a circular ring shape, and comprises the following elements in percentage by weight: PrNd: 29-31%, Dy: 0.5% -1%, GdFe: 0.3% -1%, Al: 0.1-0.5%, Cu: 0.1-0.5%, ZrFe: 0.1% -0.5%, Co: 0.1% -0.5%, B: 3% -10%, Fe: 55 to 63 percent, and the sum of the weight percent of the components is 100 percent.
The invention is further provided with: a preparation method of a large neodymium iron boron magnetic ring or magnetic cake comprises the following steps: step 1, filling ingredients for preparing a large neodymium iron boron magnetic ring or magnetic cake into a vacuum rapid hardening furnace, vacuumizing, filling argon, smelting at a high temperature of 1400 ℃ for half an hour and a low temperature of 950-1050 ℃, and refining for 15-22 minutes to prepare a cast sheet;
step 4, filling the prepared powder into a die, then carrying out compression molding, then carrying out magnetizing orientation, adjusting the pressure to 7-8 Mpa, pressurizing to obtain a blank, packaging by adopting 8-10 layers of thin film single sheets, then carrying out vacuum packaging by using a vacuum bag, and adjusting the pressure by an isostatic press to 180-190 Mpa so as to improve the density of the product;
step 5, putting the prepared blank into a graphite box; before loading in the graphite box, 40um corundum sand is laid on the bottom of the graphite box, the blank is placed on the corundum sand, the graphite cover plate is covered, and then the graphite box is placed in a high vacuum sintering furnace for sintering.
The invention is further provided with: in the step 5, when sintering is carried out, the sintering furnace is vacuumized, the temperature is raised to 380 ℃ at the rate of 3-8 ℃ per minute, the temperature is kept for 60-120 minutes, then the temperature is raised to 850 ℃ at the rate of 2-5 ℃ per minute, compact shrinkage and air release of the blank are achieved, the temperature is kept for 200-360 minutes, the temperature is raised to 1050-1150 ℃, and the temperature is kept for 300-600 minutes. Naturally cooling to 900 ℃, filling argon or nitrogen for air cooling, and discharging.
The invention is further provided with: the mould that is used for the powder after the confession is made to pack into in step 4 includes the die holder, can dismantle connect in connecting plate, two in opposite directions sliding connection in the die holder upper surface the connecting plate can surround the side module, the lid that form circular die cavity and fit side module, the last module of side module upper surface, after the powder after the confession was made fills between connecting plate, last module, two side modules, carries out compression molding through the moulding press, takes out and gets into behind the drawing of patterns transport mechanism from the moulding press after the compression molding, demolishs last module, side module and die holder, makes the body after the mould pressing persist in the connecting plate, later takes out and carries out vacuum packaging through drawing of patterns transport mechanism.
The invention is further provided with: the demolding transfer mechanism comprises an operation table connected with a molding press, a sealing frame arranged on the operation table and used for realizing operation of the molded blank in an oxygen-free environment, a truss arranged in the sealing frame and used for hoisting a connecting plate and the blank, a cart used for moving the blank, a butt plate used for butting the lower surface of the turned blank, and a protective sleeve placed on the butt plate and used for keeping the shape of the blank; when the film single sheets and the bag parts are sleeved on the green body in advance, the outer side wall of the green body is sleeved with the protective sleeve, if the green body is annular, when the die cavity of the die is filled with manufactured powder, the corresponding die core is installed in the die in advance, then the upper surface of the green body is covered with the butt plate, the butt plate is connected with the connecting plate through bolts, then the butt plate is lifted by a truss vehicle and turned over for 180 degrees, the push vehicle is placed in a pushing vehicle, the connecting plate and the protective sleeve are taken down, the green body is coated with the film single sheets and the vacuum bag, then the blank is vacuumized and transferred to a static pressure machine, the blank is transported out through the pushing vehicle, static pressure is carried out, and when the green body is in, the die core is taken out after the static pressure is finished.
The invention is further provided with: the sealing frame is provided with two groups of separating assemblies for separating an inner cavity of the sealing frame into three chambers, each separating assembly comprises a separating plate which is arranged on the sealing frame and is connected to the sealing frame in a sliding mode along the vertical direction and used for separating the inner cavity of the sealing frame, and an air cylinder which is arranged on the upper end face of the sealing frame and used for driving the separating plates to lift, the number of the truss lathes is two, and the two truss lathes are respectively positioned in the two chambers close to one side of the molding press; when the device is used, nitrogen is filled into the sealing frame, then the die-cast green body is taken out to a cavity closest to a molding press, the connecting plate and the green body are taken down from the mold, the connecting plate is lifted by the truss vehicle and placed in a trolley, then adjacent partition plates are driven to ascend, the trolley is moved into the adjacent cavity, the partition plates are reset, then the thin film single sheets and the vacuum bag are partially sleeved on the green body in advance, the outer side wall of the green body is sleeved with a protective sleeve, the abutting plate is covered, the connecting plate is lifted by the next truss vehicle, the connecting plate is overturned for 180 degrees, and then the connecting plate is placed in the trolley; unloading the connecting plate, the protecting sleeve, packaging the thin film single sheets and the vacuum bag, vacuumizing, opening the next separating plate, pushing the cart into a chamber far away from the molding press, and transferring the blank body and the butt plate out to enter a static press.
In conclusion, the invention has the following beneficial effects:
the component proportion of the elements is beneficial to sintering large neodymium iron boron magnetic rings or magnetic cakes (the diameter or the outer diameter is more than or equal to 200mm), the cracking condition is avoided, and the stable magnetic performance is ensured.
The compression molding of the large neodymium iron boron magnetic ring or the magnetic cake is facilitated, the compression molded large neodymium iron boron magnetic ring or magnetic cake blank is demoulded through the corresponding mould and the demould transfer mechanism, the blank is packed in a vacuum mode in an oxygen-free environment, the blank is further extruded through a static pressure machine, and the density of the blank is improved; and then, preparing the large neodymium iron boron magnetic ring or magnetic cake with the corresponding specification by sintering and machining.
Disassemble through the mould at the in-process of drawing of patterns, place in the shallow through the body together with the connecting plate, then establish the protective sheath through the cover and cover the butt joint board after, the upset body to the realization takes out the connecting plate, and the body is established to convenient with film monolithic and vacuum bag cover, realizes anaerobic environment packing, and the simple operation, and avoids the body to produce deformation or damage when drawing of patterns.
Drawings
FIG. 1 is a schematic structural view of a mold release transfer mechanism in example 2;
FIG. 2 is a schematic view showing a part of a sealing sheet hidden by the mold release transfer mechanism in example 2;
FIG. 3 is a schematic view showing the connection plate and the green sheet in example 2 when they are set in a cart;
FIG. 4 is a schematic view of the blank of example 2 with the protective sheath and the fixed abutting plate;
FIG. 5 is a schematic view of a mold in example 2;
FIG. 6 is a schematic view of a mold-hidden upper module in example 2;
FIG. 7 is a schematic view of the blank covered with the protective sheath and the fixed abutting plate in example 2;
fig. 8 is a cross-sectional view of the blank of fig. 7 with the protective sleeve and the fixed abutment plate.
The corresponding part names indicated by the numbers in the figures: 1. a lower die holder; 2. a connecting plate; 3. a side module; 4. an upper module; 5. an operation table; 6. a sealing frame; 7. a truss vehicle; 8. pushing a cart; 9. a butt joint plate; 10. a protective sleeve; 11. a partition plate; 12. and a cylinder.
Detailed Description
In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the invention is further described with reference to the figures and the specific embodiments.
Example 1: the invention provides a large neodymium iron boron magnetic ring or magnetic cake, which is arranged in a round cake shape or a circular ring shape, and comprises the following elements in percentage by weight: PrNd: 29-31%, Dy: 0.5% -1%, GdFe: 0.3% -1%, Al: 0.1-0.5%, Cu: 0.1-0.5%, ZrFe: 0.1% -0.5%, Co: 0.1% -0.5%, B: 3% -10%, Fe: 55 to 63 percent, and the sum of the weight percent of the components is 100 percent. The component proportion of the elements is beneficial to sintering large neodymium iron boron magnetic rings or magnetic cakes (the diameter or the outer diameter is more than or equal to 200mm), the cracking condition is avoided, and the stable magnetic performance is ensured.
Example 2: a method of making the large neodymium iron boron magnet ring or the magnetic cake of embodiment 1, comprising the steps of:
step 1, filling ingredients for preparing a large neodymium iron boron magnetic ring or magnetic cake into a vacuum rapid hardening furnace, vacuumizing, filling argon, smelting at a high temperature of 1400 ℃ for half an hour and a low temperature of 950-1050 ℃, and refining for 15-22 minutes to prepare a cast sheet;
step 4, filling the prepared powder into a die, then carrying out compression molding, then carrying out magnetizing orientation, adjusting the pressure to 7-8 Mpa, pressurizing to obtain a blank, carrying out 8-10-layer packaging on a single film, carrying out vacuum packaging by using a vacuum bag, and adjusting the pressure by an isostatic press to 180-190 Mpa so as to improve the density of the product;
step 5, putting the prepared blank into a graphite box; before loading in the graphite box, 40um corundum sand is laid on the bottom of the graphite box, the blank is placed on the corundum sand, the graphite cover plate is covered, and then the graphite box is placed in a high vacuum sintering furnace for sintering.
As shown in fig. 1 to 8, in step 4, the mold for filling the manufactured powder includes a lower mold base 1, a connecting plate 2 detachably connected to an upper surface of the lower mold base 1, two side mold blocks 3 connected to the connecting plate 2 in a sliding manner in opposite directions and capable of enclosing to form a circular mold cavity, and an upper mold block 4 covering an upper surface of the side mold block 3. A mechanism for realizing drawing of patterns is drawing of patterns transport mechanism, and drawing of patterns transport mechanism includes the operation panel 5 of being connected with the molding press, set up in operation panel 5 and realize the sealed frame 6 of operation under the mould pressing back base body anaerobic environment, set up in sealed frame 6 and be used for the purlin car 7 of handling connecting plate 2 and base body, be used for supplying the shallow 8 of base body removal, be used for supplying butt plate 9 of base body lower surface butt after the upset, place in butt plate 9 and the lag 10 that keeps the base body shape, the lag 10 material can play the guard action for rubber or foam material etc. break, split when avoiding the drawing of patterns. The sealing frame 6 is provided with two sets of separating assemblies for separating the inner cavity of the sealing frame 6 into three chambers, each separating assembly comprises a separating plate 11 which is connected with the sealing frame 6 in a sliding mode in the vertical direction and separates the inner cavity of the sealing frame 6, and a cylinder 12 which is arranged on the upper end face of the sealing frame 6 and drives the separating plate 11 to lift, the two truss lathes 7 are arranged in two chambers, and the two truss lathes 7 are located on one side of the die pressing machine respectively.
When the prepared powder is filled into a die and then molded, the prepared powder is filled among the connecting plate 2, the upper die block 4 and the two side die blocks 3, and then the die is moved into a molding press and molded by the molding press. The upper die block 4, the side die block 3 and the connecting plate 2 are detached from the lower die holder 1 and fall down, the pressed green body is left on the connecting plate 2, then the connecting plate 2 is pulled by the truss vehicle 7 above, the connecting plate 2 is placed on the cart 8, then the adjacent partition plate 11 is driven to rise, the cart 8 is moved into the adjacent cavity, and the partition plate 11 is reset. Then, the film single sheets and the vacuum bag are sleeved on the blank body in advance, the outer side wall of the blank body is sleeved with the protective sleeve 10, the abutting plate 9 is covered, and then the abutting plate 9 is connected with the connecting plate 2 through bolts. Lifting the connecting plate 2 by the next truss 7, turning the connecting plate 2 by 180 degrees, and placing the connecting plate on a trolley 8; unloading the connecting plate 2 and the protecting sleeve 10, packaging the thin film single sheets and the vacuum bag, vacuumizing, opening the next separating plate 11, pushing the cart 8 into a cavity far away from the molding press, rotating the blank and the butt plate 9 out, then entering a static press, and then realizing full extrusion through the static press to improve the density of the blank. And when the magnetic ring is subjected to compression molding, the corresponding mold core is arranged in a mold in advance, the prepared powder is filled, the mold is pressed, the mold core is still on the molded blank during static pressure, and the mold core is taken out after the static pressure is finished.
In the step 5, when sintering is carried out, the sintering furnace is vacuumized, the temperature is raised to 380 ℃ at the rate of 3-8 ℃ per minute, the temperature is kept for 60-120 minutes, then the temperature is raised to 850 ℃ at the rate of 2-5 ℃ per minute, the compact shrinkage and air release of the blank are realized, namely, the gas in the blank is discharged, the sintering compactness of the blank is improved, the temperature is kept for 200-360 minutes, the temperature is raised to 1050-1150 ℃, and the temperature is kept for 300-600 minutes. And naturally cooling to 900 ℃, filling argon or nitrogen for air cooling, discharging, and thus processing the rough blank of the large neodymium iron boron magnetic ring or the magnetic cake, and then processing the product with the corresponding specification through machining.
In this document, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the purpose of clarity and convenience of description of the technical solutions, and thus, should not be construed as limiting the present invention.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A large neodymium iron boron magnetic ring or magnetic cake is characterized by being arranged in a round cake shape or a circular ring shape, and comprising the following elements in percentage by weight: PrNd: 29-31%, Dy: 0.5% -1%, GdFe: 0.3% -1%, Al: 0.1-0.5%, Cu: 0.1-0.5%, ZrFe: 0.1% -0.5%, Co: 0.1% -0.5%, B: 3% -10%, Fe: 55 to 63 percent, and the sum of the weight percent of the components is 100 percent.
2. A preparation method of a large neodymium iron boron magnetic ring or magnetic cake is characterized by comprising the following steps:
step 1, filling ingredients for preparing a large neodymium iron boron magnetic ring or magnetic cake into a vacuum rapid hardening furnace, vacuumizing, filling argon, smelting at a high temperature of 1400 ℃ for half an hour and a low temperature of 950-1050 ℃, and refining for 15-22 minutes to prepare a cast sheet;
step 2, performing hydrogen reaction crushing treatment on the prepared cast sheet;
step 3, adding 0.3-0.5% of antioxidant into the powder after hydrogen reaction crushing, mixing, adding into an airflow mill after 20-30 minutes, and grinding to obtain 2.5-3.5 um powder;
step 4, filling the prepared powder into a die, then carrying out compression molding, then carrying out magnetizing orientation, adjusting the pressure to 7-8 Mpa, pressurizing to obtain a blank, packaging by adopting 8-10 layers of thin film single sheets, then carrying out vacuum packaging by using a vacuum bag, and adjusting the pressure by an isostatic press to 180-190 Mpa so as to improve the density of the product;
step 5, putting the prepared blank into a graphite box; before loading in the graphite box, 40um corundum sand is laid on the bottom of the graphite box, the blank is placed on the corundum sand, the graphite cover plate is covered, and then the graphite box is placed in a high vacuum sintering furnace for sintering.
3. The method as claimed in claim 2, wherein in the step 5, the sintering furnace is vacuumized, the temperature is raised to 380 ℃ at a rate of 3-8 ℃ per minute, the temperature is maintained for 60-120 minutes, the temperature is raised to 850 ℃ at a rate of 2-5 ℃ per minute, the compact shrinkage and air release of the blank are realized, the temperature is maintained for 200-360 minutes, the temperature is raised to 1050-1150 ℃, and the temperature is maintained for 300-600 minutes. Naturally cooling to 900 ℃, filling argon or nitrogen for air cooling, and discharging.
4. The method for preparing a large neodymium iron boron magnetic ring or magnetic cake as claimed in claim 2, wherein the mold used for filling the prepared powder in step 4 comprises a lower mold base (1), a connecting plate (2) detachably connected to the upper surface of the lower mold base (1), two side modules (3) which are connected to the connecting plate (2) in a sliding manner in opposite directions and can surround to form a circular mold cavity, and an upper module (4) which covers the upper surface of the side modules (3), when the prepared powder is filled among the connecting plate (2), the upper module (4) and the two side modules (3), the powder is molded by a molding machine, after the powder is molded, the powder is taken out of the molding machine and enters the demolding transfer mechanism, the upper module (4), the side modules (3) and the lower mold base (1) are removed, and the molded blank is left on the connecting plate (2), and then taking out the product through a demoulding transfer mechanism and carrying out vacuum packaging.
5. The preparation method of the large neodymium iron boron magnetic ring or magnetic cake as claimed in claim 4, wherein the demolding transfer mechanism comprises an operation table (5) connected with a molding press, a sealing frame (6) arranged on the operation table (5) and used for realizing operation of the molded blank in an oxygen-free environment, a truss (7) arranged in the sealing frame (6) and used for hoisting the connecting plate (2) and the blank, a cart (8) used for moving the blank, a butt plate (9) used for butting the lower surface of the turned blank, and a protecting sleeve (10) placed on the butt plate (9) and used for keeping the shape of the blank; when the film single sheets and the bag parts are pre-sleeved on a green body, a protective sleeve (10) is sleeved on the outer side wall of the green body, if the green body is annular, when a mold cavity of a mold is filled with prepared powder, a corresponding mold core is pre-installed in the mold, a corresponding filler is filled in an annular inner cavity of the green body, a butt plate (9) is covered on the upper surface of the green body, the butt plate (9) is connected with a connecting plate (2) through a bolt, then the green body is lifted and turned over for 180 degrees through a truss vehicle (7), the green body is placed in a trolley (8), the connecting plate (2) and the protective sleeve (10) are taken down, the green body is coated with the film single sheets and the vacuum bag, then the green body is vacuumized and transferred to a static pressure machine, the green body is transferred out through the trolley (8) for static pressure, and when the green body is annular, the mold core is taken out after the static pressure is finished.
6. The preparation method of the large neodymium iron boron magnetic ring or the magnetic cake as claimed in claim 5, characterized in that the sealing frame (6) is provided with two sets of partition components for dividing the inner cavity of the sealing frame (6) into three chambers, the partition components comprise partition plates (11) which are arranged on the vertical direction and slidably connected to the sealing frame (6) and partition the inner cavity of the sealing frame (6), air cylinders (12) which are arranged on the upper end face of the sealing frame (6) and drive the partition plates (11) to lift, the number of the truss cars (7) is two, and the two truss cars (7) are respectively positioned in the two chambers at a position close to one side of the molding press; when the device is used, nitrogen is filled in a sealing frame (6), then a die-cast blank body is taken out to a cavity closest to a molding press, a connecting plate (2) and the blank body are taken down from a mold, the connecting plate (2) is lifted through a truss (7) and placed in a trolley (8), then adjacent partition plates (11) are driven to ascend, the trolley (8) is moved into the adjacent cavity, the partition plates (11) are reset, then the thin film single sheets and the vacuum bag are partially sleeved on the blank body, the outer side wall of the blank body is sleeved with a protective sleeve (10), the abutting plate (9) is covered, and then the connecting plate (2) is lifted through the next truss (7) and placed in the trolley (8) after the connecting plate (2) is turned over for 180 degrees; unloading the connecting plate (2) and the protective sleeve (10), packaging the membrane single sheets and the vacuum bag, vacuumizing, opening the next separation plate (11), pushing the cart (8) into a cavity far away from the molding press, and transferring the blank body and the abutting plate (9) out to enter a static press.
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|---|---|---|---|
| CN202111177438.3A CN114005632A (en) | 2021-10-09 | 2021-10-09 | Large neodymium iron boron magnet ring or magnet cake and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111177438.3A CN114005632A (en) | 2021-10-09 | 2021-10-09 | Large neodymium iron boron magnet ring or magnet cake and preparation method thereof |
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