CN114743786B - Production process of sintered NdFeB magnetic material - Google Patents
Production process of sintered NdFeB magnetic material Download PDFInfo
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- CN114743786B CN114743786B CN202210418038.5A CN202210418038A CN114743786B CN 114743786 B CN114743786 B CN 114743786B CN 202210418038 A CN202210418038 A CN 202210418038A CN 114743786 B CN114743786 B CN 114743786B
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- 229910001172 neodymium magnet Inorganic materials 0.000 title claims abstract description 123
- 239000000696 magnetic material Substances 0.000 title claims abstract description 118
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims abstract description 79
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 238000003754 machining Methods 0.000 claims abstract description 16
- 238000009713 electroplating Methods 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 10
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 238000005245 sintering Methods 0.000 claims abstract description 7
- 238000004458 analytical method Methods 0.000 claims abstract description 4
- 230000005291 magnetic effect Effects 0.000 claims description 94
- 239000000463 material Substances 0.000 claims description 69
- 239000010935 stainless steel Substances 0.000 claims description 37
- 229910001220 stainless steel Inorganic materials 0.000 claims description 37
- 238000003825 pressing Methods 0.000 claims description 35
- 238000000227 grinding Methods 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 235000013350 formula milk Nutrition 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 12
- 238000005192 partition Methods 0.000 claims description 9
- 238000007689 inspection Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 235000020610 powder formula Nutrition 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000000462 isostatic pressing Methods 0.000 claims description 3
- 238000002074 melt spinning Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 101000623895 Bos taurus Mucin-15 Proteins 0.000 claims 1
- 230000005389 magnetism Effects 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract description 8
- 230000005408 paramagnetism Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 description 33
- 230000007797 corrosion Effects 0.000 description 30
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000000956 alloy Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 229910052779 Neodymium Inorganic materials 0.000 description 8
- 239000002585 base Substances 0.000 description 6
- 229910052796 boron Inorganic materials 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 6
- 229910052755 nonmetal Inorganic materials 0.000 description 6
- 239000006104 solid solution Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 229910052726 zirconium Inorganic materials 0.000 description 4
- 241001391944 Commicarpus scandens Species 0.000 description 3
- 150000001868 cobalt Chemical class 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 229910003460 diamond Inorganic materials 0.000 description 3
- 239000010432 diamond Substances 0.000 description 3
- 230000005489 elastic deformation Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 229910001004 magnetic alloy Inorganic materials 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- ZDVYABSQRRRIOJ-UHFFFAOYSA-N boron;iron Chemical compound [Fe]#B ZDVYABSQRRRIOJ-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 2
- 230000005298 paramagnetic effect Effects 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910017709 Ni Co Inorganic materials 0.000 description 1
- 229910003267 Ni-Co Inorganic materials 0.000 description 1
- 229910003262 Ni‐Co Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a production process of a sintered NdFeB magnetic material, which relates to the field of production processes of sintered NdFeB magnetic materials and comprises the following steps: s1: raw material analysis, S2: formula S3: and (4) preparation and molding, wherein S4: vacuum sintering, S5: finish machining, S6: electroplating, S7: warehousing a finished product; the Nd has paramagnetism, the magnetism in the prepared neodymium iron boron magnetic material can be increased, and the Nd consumption takes an intermediate value of 18% -33% in the prior art, so that the neodymium iron boron magnetic material is ensured to have enough magnetism, and the defect that the whole neodymium iron boron magnetic material is brittle due to the characteristic that the Nd consumption is not excessive and the Nd is easy to oxidize can be achieved.
Description
Technical Field
The invention relates to the field of production processes of sintered NdFeB magnetic materials, in particular to a production process of a sintered NdFeB magnetic material.
Background
The neodymium iron boron permanent magnet material is a permanent magnet material based on an intermetallic compound Nd2Fe 14B. Compared with cast Al-Ni-Co permanent magnetic materials and ferrite permanent magnetic materials, the neodymium iron boron has extremely high magnetic energy product and coercive force, and can absorb a weight which is 640 times of the self weight. The advantage of high energy density makes neodymium iron boron permanent magnet materials widely used in modern industry and electronic technology. The device can be miniaturized, light and thin for instruments, electroacoustic motors, magnetic separation magnetization, medical appliances, medical equipment and the like. The neodymium-iron-boron permanent magnet has the advantages of high cost performance and good mechanical properties; the defects are that the Curie temperature point is low, the temperature characteristic is poor, the powder corrosion is easy, and the requirements of practical application can be met by adjusting the chemical components and adopting a surface treatment method to improve the powder corrosion.
In the prior art, the integral mechanical property of the neodymium iron boron permanent magnet material is poor, the neodymium iron boron permanent magnet material is easy to brittle fracture during preparation, is easy to be influenced by corrosion during use, has a low integral service life, and is difficult to be compressed and lifted again due to the mass density of the neodymium iron boron permanent magnet material, so that the integral volume of the neodymium iron boron permanent magnet material is larger under the condition of ensuring certain magnetic strength, and the use is limited.
Therefore, it is necessary to invent a process for producing sintered NdFeB magnetic material to solve the above problems.
Disclosure of Invention
The invention aims to provide a production process of a sintered NdFeB magnetic material so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the production process of the sintered NdFeB magnetic material comprises the following steps:
s1: raw material analysis, namely preparing raw material powder for manufacturing the neodymium iron boron magnetic material, detecting whether the performance of the raw material meets the standard, and replacing the raw material powder with the performance which does not meet the standard with the raw material powder with the performance which meets the standard;
s2: the formula is prepared into a raw material powder formula for manufacturing the neodymium iron boron magnetic material, and the formula comprises the following components in percentage by mass: 20 to 23 percent of Nd (Nd has paramagnetic property, can increase the magnetism in the prepared neodymium iron boron magnetic material, and the Nd consumption takes an intermediate value of 18 to 33 percent in the prior art, thereby not only ensuring that the neodymium iron boron magnetic material has enough magnetism, but also achieving the defect that the whole neodymium iron boron magnetic material is brittle due to the characteristic that the Nd is easy to oxidize because of not too much Nd), 10 to 13 percent of B (the hardness of B is only inferior to that of diamond, the B consumption is more than 0.95 to 1.1 percent in the prior art, the strength of the whole neodymium iron boron magnetic material is increased, the neodymium iron boron magnetic material is not easy to break, and the corrosion resistance is relatively increased), 5 to 10 percent of Co (Co is an important raw material for producing heat-resistant alloy, hard alloy, anti-corrosion alloy, magnetic alloy and various cobalt salts, and the Co consumption is more than 0 to 4 percent in the prior art, the heat resistance, corrosion resistance and strength performance of the whole neodymium iron boron magnetic material can be improved), 0 to 0.3 percent of Cu and 5 to 8 percent of Nb (the ductility of Nb is higher but can be hardened along with the increase of impurity content), the use amount of Nb is 0 to 1 percent of the content of Nb in the prior art, the whole ductility of the neodymium iron boron magnetic material is fully increased, the phenomena of the increase of the brittle fracture performance and the reduction of the ductility of the whole neodymium iron boron magnetic material caused by the excessive use of Nd, B and Co are changed by combining the increase of the proper use amount of Nd and the increase of the use amount of Co, so that the neodymium iron boron magnetic material has higher strength and hardness while keeping higher ductility and is not easy to fracture, and the performances of the neodymium iron boron magnetic material in all aspects are combined), 1% -1.3% of Zr (Zr is mixed in the formula for preparing the neodymium iron boron magnetic material, and because the Co consumption is increased, the defect that Zr is easy to react with non-metal and a plurality of metal elements at high temperature to generate solid solution is overcome, the increased Co and Zr are applied in the formula for preparing the neodymium iron boron magnetic material, so that the heat resistance of the whole neodymium iron boron magnetic material and Zr are improved, the phenomenon that the excessive Zr consumption reacts with a large amount of non-metal and a plurality of metal elements at high temperature to generate solid solution is avoided, the neodymium iron boron magnetic material is not easy to be influenced by external factors to corrode is avoided, 3% -5% of Al (in the prior art, the Al consumption is 0% -2%, the ductility of the whole neodymium iron boron magnetic material is improved, and the Al is mixed in the neodymium iron boron magnetic material, and the Al on the surface of the neodymium iron boron magnetic material can form an oxide film for preventing metal corrosion in humid air, and simultaneously the corrosion resistance of the surface of the neodymium iron boron magnetic material is increased), 2% -3% of Ga (Ga is more stable in dry air and generates oxide and prevents the oxide from generating alkali oxide in the dry air and the surface of the neodymium iron boron magnetic material from being corroded), and the corrosion resistance of the surface is improved to be the surface of the corrosion resistance of the metal is further improved, and the corrosion resistance of the surface is increased to be the surface of the silicon (Fe is 2% -2%);
S3: the preparation and molding are carried out, the materials are pressed and molded by molding equipment after the formula in S2 is subjected to melt spinning, hydrogen breaking, powder preparation, material mixing and sieving, isostatic pressing is carried out after the pressing and molding, and then the products are peeled, namely: stripping the product from the mould on the forming equipment to form a preliminary product;
s4: vacuum sintering, namely sintering and forming the primary product formed in the step S3 in a vacuum state to form a blank, wherein performance detection is required for the blank, warehousing is performed after the magnetic property, the strength, the hardness, the ductility, the heat resistance and the corrosiveness of the blank meet the requirements, and the blank is smashed and recycled when the performance is not in accordance with the requirements;
s5: finish machining, namely finishing the blanks after warehouse entry to form finished blanks, checking the finished blanks again, and carrying out finish machining operation again if the finished blanks are qualified for standby;
s6: electroplating, namely electroplating the finish machining blank, checking whether the electroplated blank is qualified or not after electroplating, packaging after the electroplated blank is qualified, and carrying out electroplating repair again when the electroplated blank is unqualified;
s7: and (3) warehousing finished products, namely warehousing the electroplated blanks subjected to the inspection in the step (S6) to form neodymium-iron-boron magnetic materials, waiting for delivery, and carrying out delivery inspection on the neodymium-iron-boron magnetic materials before delivery.
Preferably, the finishing in S5 includes machining steps such as centerless grinding, trepanning, hole washing, slicing, double-sided grinding, chamfering, and the like.
In the equipment, slicing and chamfering are all common processing in the prior art, and can be realized by using a slicing machine and a chamfering machine, and the details are omitted herein.
Preferably, the centerless grinding is used for primarily grinding all surfaces of the blank, and the double-sided grinding is used for simultaneously grinding two sides of the blank, so that the consistency of the double-sided grinding quality of the blank is ensured.
Preferably, the trepanning is used for drilling holes on the neodymium iron boron magnetic material by using a bench drill, and the holes are cleaned by cleaning equipment, so that the positions of the holes are clean and the inner wall is smooth.
Preferably, the former in S3 includes the bottom plate, be provided with the mould subassembly on the bottom plate, the fixed welding in upper surface one side of bottom plate has the side support frame, and the fixed welding in upper end of side support frame has the upper base plate, and the fixed welding in lower surface of upper base plate has the second adapter sleeve, is connected with drive assembly on the second adapter sleeve, the top of bottom plate is provided with the top board, drive assembly includes the telescoping unit, the upper end of telescoping unit is fixed on the second adapter sleeve through the screw rod, the fixed welding in upper surface middle part of top board has first adapter sleeve, the lower extreme of telescoping unit is fixed on first adapter sleeve through the screw rod, the mould subassembly includes mould board one and mould board two, mould board one, mould board two all are provided with two sets of, mould board one, mould board two all are rectangular plate structures, and mould board one is arranged along the length direction of bottom plate, and the width of bottom plate is arranged, and the both sides of two sets of mould boards are movable laminating respectively in the one side that two sets of mould boards are close to each other, the inside of mould board one is provided with supplementary mould board, and inside the inside of drive assembly that is provided with the second mould board is provided with the second drive assembly, drive assembly is still provided with the second mould board on the second bottom plate.
When the material is placed on the upper surface of the bottom plate between the first die plate and the second die plate, the upper part of the material is pressed through the upper pressing plate, then the first driving assembly and the second driving assembly are used for driving the first die plates to be pressed on the two sides of the second die plate, and then the second driving assembly is used for driving the second die plates to move towards the middle of the first die plate, so that the material is pressed between the first die plates, the second die plates, the upper pressing plate and the bottom plate, a preliminary product is formed after static pressure is carried out for a certain time, and the preliminary product is peeled from the die assemblies.
Preferably, the first driving assembly comprises a first supporting plate fixedly welded on the upper surface of the bottom plate, a second pushing unit is fixedly welded on one surface of the first supporting plate, which is close to the first die plate, and a fourth connecting sleeve for fixing the end part of the second pushing unit through a screw rod is fixedly welded on the middle part of the first die plate.
Further, the second pushing unit can use devices such as an electric push rod or an air cylinder, and the second pushing unit is detachably connected with the first die plate, so that the second pushing unit is convenient to assemble, disassemble and maintain.
Preferably, the second driving assembly comprises a second supporting plate fixedly welded on the upper surface of the bottom plate, a first pushing unit is fixedly welded on one surface, close to the second die plate, of the second supporting plate, and a third connecting sleeve for fixing the end part of the first pushing unit through a screw rod is fixedly welded on the middle part of the second die plate.
Specifically, the first pushing unit can use devices such as an electric push rod or an air cylinder, and the first pushing unit is detachably connected with the first die plate, so that the first pushing unit is convenient to assemble, disassemble and maintain.
Preferably, the length of the second die plate is smaller than that of the first die plate, the length of the first die plate is equal to the length and width of the bottom plate, and the length and width of the bottom plate are respectively equal to the length and width of the upper pressing plate.
When the upper pressing plate is pressed above the die assembly, the upper pressing plate can be bonded and sealed with the first die plate and the second die plate, material leakage is avoided, sealing is also avoided between the bottoms of the first die plate and the second die plate and the upper surface of the bottom plate, material leakage in the die assembly is also avoided, and specifically, rubber strips are fixedly arranged on the upper surface and the lower surface of the first die plate and the second die plate, so that the sealing effect on the whole die assembly is achieved.
Preferably, the first auxiliary assembly comprises a first inner groove arranged in the first inner groove of the die plate, a stainless steel plate, a first magnetic block and a second magnetic block are arranged in the first inner groove, the stainless steel plate is movably arranged in the first inner groove and keeps a gap with the inner wall of one side of the first inner groove, which is close to the second die plate, an elastic connecting plate is fixedly welded on one surface of the stainless steel plate, which is far away from the second die plate, one end of the elastic connecting plate, which is far away from the stainless steel plate, is fixed on the inner wall of one side, which is far away from the second die plate, of the first inner groove, the stainless steel plate, the first magnetic block and the second magnetic block are all provided with a plurality of groups, the plurality of groups of stainless steel plates are distributed along the length direction of the first die plate at equal distance, the plurality of groups of first magnetic blocks and the second magnetic blocks are distributed between the plurality of groups of stainless steel plates in a staggered manner, the first magnetic block and the second magnetic block are fixed on the inner wall of one side, which is close to the second inner groove is close to the second die plate, the same side of the second magnetic block is opposite magnetic pole, and two ends of the magnetic plate are N pole and S pole respectively.
In the device, when the mould board II moves between two mould boards I, the magnetic plate tip moves to the first magnetic block inboard of corresponding second magnetic block and can be kept away from or inhale mutually when being close to it, and the position of first magnetic block, the second magnetic block is fixed, therefore, when having caused mould board II to move, the magnetic plate is because the attraction of first magnetic block, the attraction of second magnetic block and round back shaft pivoted phenomenon, the vibration after having realized that the magnetic plate stir elastic metal sheet elastic deformation, thereby drive mould board two vibrations, the material in the mould structure is compressed tightly because of the vibration effect, the pressfitting degree when having improved the material compression, and the magnetic plate can attract the corrosion resistant plate to be close to when passing corrosion resistant plate one side, make corrosion resistant plate tensile elastic connection plate, and the corrosion resistant plate high-speed beating is on one side inner wall of mould board II near to the corrosion resistant plate at first internal groove, and the corrosion resistant plate is reset through the resume effect of elastic connection plate when the corrosion resistant plate through here, because the elastic connection plate has certain elasticity, make the material of elastic connection plate to stir elastic connection plate elastic deformation after vibrating, the purpose vibration plate vibration, the purpose is realized that the material in the mould is filled with the mould material, the vibration particle is filled to the mould has been realized to the vibration material, the vibration particle is filled to the mould has further, the vibration material has been filled, the mould material has been filled to vibration in the mould has been filled.
Preferably, the second auxiliary assembly comprises a second inner groove arranged in the second inner part of the die plate, a partition plate is fixedly arranged in the second inner groove, the partition plate partitions the second inner part of the second inner groove into a second cavity positioned in the middle and a third cavity and a first cavity positioned at two sides of the second cavity, one end, close to the first inner groove, of the third cavity is provided with a supporting shaft, the supporting shaft is distributed along the height direction of the second die plate, a magnetic plate is sleeved on the supporting shaft in a rotating mode, the magnetic plate is of an oval plate-shaped structure, an elastic metal plate which is movably blocked at the side surfaces of two ends of the magnetic plate is arranged on the inner wall of one side of the third cavity, a pressurizing unit is fixedly welded on the outer side surface of the second die plate, a main pipeline is arranged on the pressurizing unit, the main pipeline is communicated with the first air pipe, the second air pipe and the third air pipe are respectively communicated with the third cavity, the second air pipe and the inner part of the first cavity, and the second inner wall of the second cavity on one side of the second die plate is of the elastic plate.
When the device is used, the lower end of the telescopic unit is connected with the upper pressing plate in a detachable mode, the telescopic unit can be conveniently maintained, the air in the second chamber is pumped into the first chamber and the third chamber by the pressurizing unit, the pressure in the second chamber is reduced, at the moment, the two groups of die plates are mutually close, so that the elastic plates at the side surface positions of the second chamber are extruded by materials in the die assembly to be deformed and sunken in an arc shape, the materials are pressed at one time, the pressurizing unit is used for pumping air in the third chamber and the first chamber into the second chamber, the air pressure in the second chamber is increased, the elastic plates are reset along with the increase of the air pressure in the second chamber, the materials in the inner cavity of the die assembly are compressed again, the pressing density of the neodymium-iron-boron magnetic materials can be improved, the whole mechanical property of the neodymium-iron-boron magnetic materials is improved, the device adopts a secondary pressurizing pressing mode, the purpose that the materials cannot be pressed excessively is achieved, and the practicability is strong.
The invention has the technical effects and advantages that:
1. according to the production process of the sintered NdFeB magnetic material, nd has paramagnetism, magnetism in the prepared NdFeB magnetic material can be increased, and the Nd consumption takes an intermediate value of 18-33% in the prior art, so that the NdFeB magnetic material is ensured to have enough magnetism, and the defect that the whole NdFeB magnetic material is brittle due to the characteristic that Nd is easy to oxidize because the Nd consumption is not excessive can be achieved;
2. according to the production process of the sintered NdFeB magnetic material, the hardness of B is only inferior to that of diamond, the dosage of B is 0.95-1.1% larger than that of the prior art, the integral strength of the NdFeB magnetic material is increased, the NdFeB magnetic material is not easy to break, and the corrosion resistance is relatively increased;
3. according to the production process of the sintered NdFeB magnetic material, co is an important raw material for producing heat-resistant alloy, hard alloy, anti-corrosion alloy, magnetic alloy and various cobalt salts, and the dosage of Co is 0-4% larger than that in the prior art, so that the overall heat resistance, corrosion resistance and strength performance of the NdFeB magnetic material are improved;
4. according to the production process of the sintered NdFeB magnetic material, the extensibility of Nb is higher, but the Nb can harden along with the increase of the impurity content, the Nb consumption is 0-1% higher than that in the prior art, the whole extensibility of the NdFeB magnetic material is fully increased, the phenomena of the increase of the brittle fracture performance and the reduction of the extensibility of the whole NdFeB magnetic material caused by the excessive use of Nd, B and Co are changed by combining the increase of the appropriate Nd consumption, the increase of the B consumption and the increase of the Co consumption, so that the NdFeB magnetic material has higher strength and hardness while keeping higher extensibility, is not easy to fracture, and has all the performances of the NdFeB magnetic material;
5. According to the production process of the sintered NdFeB magnetic material, the corrosion resistance of the NdFeB magnetic material is fully improved by mixing Zr in the formula for preparing the NdFeB magnetic material, and the defect that Zr is easy to react with non-metal and a plurality of metal elements at high temperature to generate solid solution is overcome due to the increase of the use amount of Co, and the increased use amount of Co and Zr are applied to the formula for preparing the NdFeB magnetic material, so that the heat resistance of the NdFeB magnetic material and the Zr are improved, and the phenomenon that the NdFeB magnetic material is not easy to be corroded due to the influence of external factors due to the fact that the excessive use amount of Zr reacts with a large amount of non-metal and a plurality of metal elements at high temperature to generate solid solution is avoided;
6. the invention relates to a production process of a sintered NdFeB magnetic material, wherein the dosage of Al in the prior art is as follows: the ductility of the whole neodymium-iron-boron magnetic material is improved by 0% -2% of the increase of the Al consumption, the Al is mixed in the neodymium-iron-boron magnetic material, the Al on the surface of the neodymium-iron-boron magnetic material can form an oxide film for preventing metal corrosion in humid air, and the corrosion resistance of the surface of the neodymium-iron-boron magnetic material is also improved;
7. according to the production process of the sintered NdFeB magnetic material, ga is more stable in dry air and generates an oxide film to prevent continuous oxidation, the Ga is delustered in humid air and reacts with alkali to release hydrogen, so that the corrosion resistance of the surface of the NdFeB magnetic material is improved;
8. According to the production process of the sintered NdFeB magnetic material, when the material is placed on the upper surface of a bottom plate between a first die plate and a second die plate, the upper part of the material is pressed by an upper pressing plate, then the first driving assembly drives the first die plates of the two groups to be pressed on the two sides of the second die plate, and then the second driving assembly drives the second die plates to move towards the middle part of the first die plate, so that the material is pressed between the first die plates of the two groups, the second die plates of the two groups, the upper pressing plate and the bottom plate, a preliminary product is formed after static pressure is carried out for a certain time, and the preliminary product is peeled from the die assemblies;
9. according to the production process of the sintered NdFeB magnetic material, when the upper pressing plate is pressed above the die assembly, the upper pressing plate can be bonded and sealed with the first die plate and the second die plate, so that material leakage is avoided, the bottoms of the first die plate and the second die plate and the upper surface of the bottom plate are also sealed, material leakage in the die assembly is also avoided, and in particular, rubber strips are fixedly arranged on the upper surface and the lower surface of the first die plate and the second die plate, so that the whole die assembly is sealed;
10. According to the production process of the sintered NdFeB magnetic material, when the second die plate moves between the first die plates, the end parts of the magnetic plates move to the inner sides of the corresponding second magnetic blocks, the corresponding second magnetic blocks are away from or attracted to the first magnetic blocks, and the positions of the first magnetic blocks and the second magnetic blocks are fixed, so that the phenomenon that the magnetic plates rotate around a supporting shaft due to the attraction or the separation of the first magnetic blocks and the second magnetic blocks when the second die plate moves is caused, the phenomenon that the magnetic plates stir elastic metal sheets to elastically deform and vibrate is realized, the second die plate is driven to vibrate, materials in a die structure are compressed and compacted due to the vibration effect, the pressing degree of the materials is improved, the stainless steel plates are attracted to be close when the magnetic plates pass through one side of the stainless steel plates, the stainless steel plates stretch the elastic connecting plates, and the stainless steel plates are high-speed hit on the inner wall of one side of the first inner groove close to the second die plate, and the stainless steel plates are reset through the restoring effect of the elastic connecting plates, and the elastic connecting plates have certain elastic force to enable the first die plates to vibrate, the first die plate and the vibration assembly and the second die assembly are further vibrated, and the vibration assembly is further fully vibrated, and the vibration material is fully pressed;
11. According to the production process of the sintered NdFeB magnetic material, the lower end of the telescopic unit is connected with the upper pressing plate in a detachable mode, the maintenance is convenient, the pressurizing unit can use devices such as an air cylinder, when the pressurizing unit pumps air in the second chamber into the first chamber and the third chamber, the pressure in the second chamber is reduced, at the moment, when the two groups of die plates are close to each other, the elastic plates at the side surface position of the second chamber are extruded by materials in the die assembly to deform and dent in an arc shape towards the inside of the second chamber, so that the materials are pressed at one time, when the pressurizing unit pumps air in the third chamber and the first chamber into the second chamber, the air pressure in the second chamber is increased, and as the air pressure in the second chamber is increased, the elastic plates are reset, so that the materials in the inner cavity of the die assembly are compressed again, the pressing density of the NdFeB magnetic material is improved, the integral mechanical property of the NdFeB magnetic material is improved, the aim of excessively pressing the materials is achieved by adopting a secondary pressurizing and pressing mode, and the practicability is strong.
Drawings
Fig. 1 is a flow chart of the production process of the sintered NdFeB magnetic material.
Fig. 2 is a finishing flow chart of the present invention.
FIG. 3 is a schematic diagram of the structure of the present invention.
Fig. 4 is a schematic view of the bottom structure of the present invention.
FIG. 5 is a schematic view of a mold assembly according to the present invention.
Fig. 6 is a top view of the mold assembly of the present invention.
FIG. 7 is a schematic view of a second embodiment of the mold plate of the present invention.
FIG. 8 is a schematic view showing the internal structures of a first die plate and a second die plate according to the present invention.
Fig. 9 is an enlarged schematic view of the structure a in fig. 7 according to the present invention.
Fig. 10 is an enlarged schematic view of the structure B in fig. 8 according to the present invention.
In the figure: the base plate 1, the first die plate 2, the second die plate 3, the first support plate 4, the second support plate 5, the first pushing unit 6, the second pushing unit 7, the upper press plate 8, the telescoping unit 9, the upper base plate 10, the side support frame 11, the first connecting sleeve 12, the second connecting sleeve 13, the third connecting sleeve 14, the fourth connecting sleeve 15, the partition plate 16, the first chamber 17, the second chamber 18, the third chamber 19, the first internal groove 20, the second internal groove 21, the elastic metal sheet 22, the support shaft 23, the magnetic plate 24, the elastic connecting plate 25, the first magnetic block 26, the stainless steel plate 27, the second magnetic block 28, the pressurizing unit 29, the main pipe 30, the first air pipe 31, the second air pipe 32, and the third air pipe 33.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a production process of a sintered NdFeB magnetic material shown in figures 1-10, which comprises the following steps:
s1: raw material analysis, namely preparing raw material powder for manufacturing the neodymium iron boron magnetic material, detecting whether the performance of the raw material meets the standard, and replacing the raw material powder with the performance which does not meet the standard with the raw material powder with the performance which meets the standard;
s2: the formula is prepared into a raw material powder formula for manufacturing the neodymium iron boron magnetic material, and the formula comprises the following components in percentage by mass: 20 to 23 percent of Nd (Nd has paramagnetic property, can increase the magnetism in the prepared neodymium iron boron magnetic material, and the Nd consumption takes an intermediate value of 18 to 33 percent in the prior art, thereby not only ensuring that the neodymium iron boron magnetic material has enough magnetism, but also achieving the defect that the whole neodymium iron boron magnetic material is brittle due to the characteristic that the Nd is easy to oxidize because of not too much Nd), 10 to 13 percent of B (the hardness of B is only inferior to that of diamond, the B consumption is more than 0.95 to 1.1 percent in the prior art, the strength of the whole neodymium iron boron magnetic material is increased, the neodymium iron boron magnetic material is not easy to break, and the corrosion resistance is relatively increased), 5 to 10 percent of Co (Co is an important raw material for producing heat-resistant alloy, hard alloy, anti-corrosion alloy, magnetic alloy and various cobalt salts, and the Co consumption is more than 0 to 4 percent in the prior art, the heat resistance, corrosion resistance and strength performance of the whole neodymium iron boron magnetic material can be improved), 0 to 0.3 percent of Cu and 5 to 8 percent of Nb (the ductility of Nb is higher but can be hardened along with the increase of impurity content), the use amount of Nb is 0 to 1 percent of the content of Nb in the prior art, the whole ductility of the neodymium iron boron magnetic material is fully increased, the phenomena of the increase of the brittle fracture performance and the reduction of the ductility of the whole neodymium iron boron magnetic material caused by the excessive use of Nd, B and Co are changed by combining the increase of the proper use amount of Nd and the increase of the use amount of Co, so that the neodymium iron boron magnetic material has higher strength and hardness while keeping higher ductility and is not easy to fracture, and the performances of the neodymium iron boron magnetic material in all aspects are combined), 1% -1.3% of Zr (Zr is mixed in the formula for preparing the neodymium iron boron magnetic material, and because the Co consumption is increased, the defect that Zr is easy to react with non-metal and a plurality of metal elements at high temperature to generate solid solution is overcome, the increased Co and Zr are applied in the formula for preparing the neodymium iron boron magnetic material, so that the heat resistance of the whole neodymium iron boron magnetic material and Zr are improved, the phenomenon that the excessive Zr consumption reacts with a large amount of non-metal and a plurality of metal elements at high temperature to generate solid solution is avoided, the neodymium iron boron magnetic material is not easy to be influenced by external factors to corrode is avoided, 3% -5% of Al (in the prior art, the Al consumption is 0% -2%, the ductility of the whole neodymium iron boron magnetic material is improved, and the Al is mixed in the neodymium iron boron magnetic material, and the Al on the surface of the neodymium iron boron magnetic material can form an oxide film for preventing metal corrosion in humid air, and simultaneously the corrosion resistance of the surface of the neodymium iron boron magnetic material is increased), 2% -3% of Ga (Ga is more stable in dry air and generates oxide and prevents the oxide from generating alkali oxide in the dry air and the surface of the neodymium iron boron magnetic material from being corroded), and the corrosion resistance of the surface is improved to be the surface of the corrosion resistance of the metal is further improved, and the corrosion resistance of the surface is increased to be the surface of the silicon (Fe is 2% -2%);
Here, S2: the formula is prepared into a raw material powder formula for manufacturing the neodymium iron boron magnetic material, and the formula comprises the following components in percentage by mass: 20% Nd,10% B,10% Co,0.3% Cu,8% Nb,1.3% Zr,5% Al,3% Ga,2% Si, the balance being Fe; .
S3: the preparation and molding are carried out, the materials are pressed and molded by molding equipment after the formula in S2 is subjected to melt spinning, hydrogen breaking, powder preparation, material mixing and sieving, isostatic pressing is carried out after the pressing and molding, and then the products are peeled, namely: stripping the product from the mould on the forming equipment to form a preliminary product;
s4: vacuum sintering, namely sintering and forming the primary product formed in the step S3 in a vacuum state to form a blank, wherein performance detection is required for the blank, warehousing is performed after the magnetic property, the strength, the hardness, the ductility, the heat resistance and the corrosiveness of the blank meet the requirements, and the blank is smashed and recycled when the performance is not in accordance with the requirements;
s5: finish machining, namely finishing the blanks after warehouse entry to form finished blanks, checking the finished blanks again, and carrying out finish machining operation again if the finished blanks are qualified for standby;
s6: electroplating, namely electroplating the finish machining blank, checking whether the electroplated blank is qualified or not after electroplating, packaging after the electroplated blank is qualified, and carrying out electroplating repair again when the electroplated blank is unqualified;
S7: and (3) warehousing finished products, namely warehousing the electroplated blanks subjected to the inspection in the step (S6) to form neodymium-iron-boron magnetic materials, waiting for delivery, and carrying out delivery inspection on the neodymium-iron-boron magnetic materials before delivery.
The finish machining in S5 comprises the machining steps of centerless grinding, trepanning, hole washing, slicing, double-sided grinding, chamfering and the like.
In the equipment, slicing and chamfering are all common processing in the prior art, and can be realized by using a slicing machine and a chamfering machine, and the details are omitted herein.
The centerless grinding is used for primarily grinding all surfaces of the blank, and the double-sided grinding is used for simultaneously grinding two sides of the blank, so that the consistency of the double-sided grinding quality of the blank is ensured.
The trepanning is to use the bench drill to drill on neodymium iron boron magnetism material, washes the hole and washs the drilling through cleaning equipment, guarantees that drilling position is clean and the inner wall is smooth.
The forming equipment in S3 includes bottom plate 1, be provided with die assembly on bottom plate 1, the fixed welding of upper surface one side of bottom plate 1 has side support frame 11, the fixed welding of upper end of side support frame 11 has upper base plate 10, the fixed welding of lower surface of upper base plate 10 has second adapter sleeve 13, be connected with drive assembly on the second adapter sleeve 13, the top of bottom plate 1 is provided with top board 8, drive assembly includes telescopic unit 9, the upper end of telescopic unit 9 passes through the screw rod to be fixed on second adapter sleeve 13, the fixed welding in upper surface middle part of top board 8 has first adapter sleeve 12, the lower extreme of telescopic unit 9 passes through the screw rod to be fixed on first adapter sleeve 12, die assembly includes die plate one 2 and die plate two 3, die plate one 2, die plate two 3 all are provided with two sets of, die plate one 2, die plate two 3 all are rectangular plate structures, die plate one 2 is arranged along the length direction of bottom plate 1, die plate two sets of die plate two 3 both sides are movable laminating respectively in the one side that die plate one is close to each other, die plate one inside is provided with inside the inside die plate 2, drive assembly one is provided with the inside die plate 2, drive assembly is provided with two inside the inside die plate 1, die assembly is still provided with the inside the drive assembly 2, the inside the drive assembly is provided with the inside the die plate 1, and is provided with the inside the drive assembly 2.
It should be noted that, when the material is placed on the upper surface of the bottom plate 1 between the first die plate 2 and the second die plate 3, the upper part of the material is pressed by the upper pressing plate 8, then the first driving assembly and the second driving assembly are used for driving the first die plate 2 to be pressed on two sides of the second die plate 3, and then the second driving assembly is used for driving the second die plate 3 to move towards the middle part of the first die plate 2, so that the material is pressed between the first die plate 2, the second die plate 3, the upper pressing plate 8 and the bottom plate 1, a preliminary product is formed after static pressure is performed for a certain time, and the preliminary product is peeled from the die assembly.
The first driving assembly comprises a first supporting plate 4 fixedly welded on the upper surface of the bottom plate 1, a second pushing unit 7 is fixedly welded on one surface of the first supporting plate 4, which is close to the first die plate 2, and a fourth connecting sleeve 15 for fixing the end part of the second pushing unit 7 through a screw rod is fixedly welded on the middle part of the first die plate 2.
Further, the second pushing unit 7 can use devices such as an electric push rod or an air cylinder, and the second pushing unit 7 is detachably connected with the first die plate 2, so that the disassembly and the maintenance are convenient.
The second driving assembly comprises a second supporting plate 5 fixedly welded on the upper surface of the bottom plate 1, a first pushing unit 6 is fixedly welded on one surface, close to the second die plate 3, of the second supporting plate 5, and a third connecting sleeve 14 for fixing the end part of the first pushing unit 6 through a screw rod is fixedly welded on the middle part of the second die plate 3.
Specifically, the first pushing unit 6 may use devices such as an electric push rod or an air cylinder, and the first pushing unit 6 is detachably connected with the first die plate 2, so that disassembly, assembly and maintenance are convenient.
The length of the second die plate 3 is smaller than that of the first die plate 2, the length of the first die plate 2 is equal to the length and width of the bottom plate 1, and the length and width of the bottom plate 1 are respectively equal to the length and width of the upper pressing plate 8.
Wherein, when top board 8 pressfitting is in the mould subassembly top, top board 8 can keep laminating sealedly with mould board 2, between the mould board two 3, has avoided the material to leak, also keeps sealedly between the upper surface of mould board 2, mould board two 3 bottoms and bottom plate 1, has also avoided the material in the mould subassembly to leak, and specifically, the upper and lower surface of mould board 2, mould board two 3 is all fixed and is provided with the rubber strip, has played the effect to whole mould subassembly is sealed.
The first auxiliary assembly comprises a first inner groove 20 arranged in the first die plate 2, a stainless steel plate 27, a first magnetic block 26 and a second magnetic block 28 are arranged in the first inner groove 20, the stainless steel plate 27 is movably arranged in the first inner groove 20 and keeps a gap with the inner wall of one side of the first inner groove 20, which is close to the second die plate 3, an elastic connecting plate 25 is fixedly welded on one side, which is far away from the second die plate 3, of the stainless steel plate 27, one end, which is far away from the stainless steel plate 27, of the elastic connecting plate 25 is fixed on the inner wall of one side, which is far away from the second die plate 3, of the first inner groove 20, a plurality of groups of stainless steel plates 27, the first magnetic blocks 26 and the second magnetic blocks 28 are all arranged in a plurality of groups, the stainless steel plates 27 are distributed equidistantly along the length direction of the first die plate 2, the plurality of groups of the first magnetic blocks 26 and the second magnetic blocks 28 are distributed among the plurality of groups of the stainless steel plates 27 in a staggered manner, the first magnetic blocks 26 and the second magnetic blocks 28 are fixed on the inner wall of one side, which is close to the second die plate 3, one side, which is far away from the second magnetic blocks 28 and the first magnetic blocks 26 are opposite in magnetic poles 24, and S poles are respectively.
In the device, when the second die plate 3 moves between the first die plates 2, the end part of the magnetic plate 24 moves to the inner side of the first magnetic block 26 of the corresponding second magnetic block 28 and is away from or is attracted to the inner side of the first magnetic block 26, and the positions of the first magnetic block 26 and the second magnetic block 28 are fixed, so that when the second die plate 3 moves, the magnetic plate 24 rotates around the supporting shaft 23 due to the attraction or the separation of the first magnetic block 26 and the second magnetic block 28, the phenomenon that the magnetic plate 24 stirs the elastic metal sheet 22 to vibrate after elastic deformation is realized, the second die plate 3 is driven to vibrate, the material in the die structure is compressed and compacted due to the vibration effect, the degree of the lamination of the material is improved, the stainless steel plate 27 is attracted to be close when the magnetic plate 24 passes through one side of the stainless steel plate 27, the stainless steel plate 27 is stretched to the elastic connecting plate 25, the stainless steel plate 27 is high-speed hit on the inner wall of one side of the first inner groove 20 close to the second die plate 3, the magnetic plate 24 passes through the stainless steel plate 27, the elastic connecting plate 25 is restored by the elastic plate 25, the elastic plate 25 is restored to the elastic plate 25, the elastic plate 2 is fully vibrated, the vibration particles are fully vibrated, the first die plate 2 is fully pressed, and the vibration material is further pressed, and the purpose of the vibration material is further improved, and the vibration of the end part of the die assembly is realized.
The second auxiliary assembly comprises a second inner groove 21 arranged in the second die plate 3, a partition plate 16 is fixedly arranged in the second inner groove 21, the partition plate 16 partitions the second inner groove 21 into a second cavity 18 positioned in the middle and a third cavity 19 and a first cavity 17 positioned at two sides of the second cavity 18, one end, close to the first inner groove 20, of the third cavity 19 is provided with a supporting shaft 23, the supporting shaft 23 is distributed along the height direction of the second die plate 3, a magnetic plate 24 is rotatably sleeved on the supporting shaft 23, the magnetic plate 24 is of an oval plate-shaped structure, an elastic metal plate 22 which is movably blocked at two end sides of the magnetic plate 24 is arranged on one side inner wall of the third cavity 19, a pressurizing unit 29 is fixedly welded on the outer side face of the second die plate 3, a main pipeline 30 is arranged on the pressurizing unit 29, the main pipeline 30 is communicated with the first air pipe 31, the second air pipe 32 and the third air pipe 33, the first air pipe 31, the second air pipe 32 and the third air pipe 33 are respectively communicated with the third cavity 19, the second cavity 18 and the inner side of the first cavity 17, and the inner wall 3 of the second die plate 18 is of an elastic plate 3.
When the device is in operation, the telescopic unit 9 can use devices such as an air cylinder or an electric push rod, the lower end of the telescopic unit 9 is connected with the upper pressure plate 8 in a detachable mode, the maintenance is convenient, the pressurizing unit 29 can use devices such as the air cylinder, when the pressurizing unit 29 pumps air in the second chamber 18 into the first chamber 17 and the third chamber 19, the pressure in the second chamber 18 is reduced, at the moment, the two groups of die plates 23 can enable materials in the die assembly to extrude elastic plates at the side surface position of the second chamber 18 to deform and dent in an arc shape towards the inside of the second chamber 18 when the die assembly is mutually close, the materials are pressed once, when the pressurizing unit 29 pumps air in the third chamber 19 and the first chamber 17 into the second chamber 18, the air pressure in the second chamber 18 is increased, the elastic plates are reset along with the increase of the air pressure in the second chamber 18, the materials in the die assembly are compressed again, the pressing density of the neodymium iron boron magnetic materials can be improved, the whole mechanical performance of the neodymium iron boron magnetic materials is improved, the device adopts a mode of pressing by secondary pressurizing and pressing, the materials can not be pressed once, and the aim of excessive compression is achieved, and the practicability is further achieved.
Working principle: when the material is placed on the upper surface of the bottom plate 1 between the first die plate 2 and the second die plate 3, the upper part of the material is pressed through the upper pressing plate 8, then the first die plate 2 is pressed on two sides of the second die plate 3 through the first driving assembly and the second driving assembly, then the second die plate 3 is driven to move towards the middle part of the first die plate 2 through the second driving assembly, so that the material is pressed between the first die plate 2, the second die plate 3, the upper pressing plate 8 and the bottom plate 1, a preliminary product is formed after static pressure is carried out for a certain time, and the preliminary product is peeled from the die assembly.
The second pushing unit 7 can use devices such as an electric push rod or an air cylinder, and the second pushing unit 7 is detachably connected with the first die plate 2, so that the second pushing unit is convenient to assemble, disassemble and maintain.
The first pushing unit 6 can use devices such as an electric push rod or an air cylinder, and the first pushing unit 6 is detachably connected with the first die plate 2, so that the disassembly and the maintenance are convenient.
When the upper pressing plate 8 is pressed above the die assembly, the upper pressing plate 8 can be bonded and sealed with the first die plate 2 and the second die plate 3, material leakage is avoided, sealing is also avoided between the bottoms of the first die plate 2 and the second die plate 3 and the upper surface of the bottom plate 1, material leakage in the die assembly is also avoided, and specifically, rubber strips are fixedly arranged on the upper surface and the lower surface of the first die plate 2 and the second die plate 3, so that the sealing effect on the whole die assembly is achieved.
When the second die plate 3 moves between the first die plates 2, the end parts of the magnetic plates 24 move to the inner sides of the first magnetic blocks 26 of the corresponding second magnetic blocks 28 and are away from or attracted to each other, and the positions of the first magnetic blocks 26 and the second magnetic blocks 28 are fixed, so that when the second die plate 3 moves, the magnetic plates 24 rotate around the supporting shaft 23 due to the attraction or the separation of the first magnetic blocks 26 and the second magnetic blocks 28, the phenomenon that the magnetic plates 24 stir the elastic metal plates 22 to elastically deform and vibrate is realized, the second die plate 3 is driven to vibrate, materials in a die structure are compressed and compacted due to vibration, the degree of lamination of the materials is improved, the stainless steel plates 27 are attracted to be close when the magnetic plates 24 pass through one side of the stainless steel plates 27, the stainless steel plates 27 stretch the elastic connecting plates 25, the stainless steel plates 27 are high-speed hit on the inner wall of one side of the first inner groove 20 close to the second die plate 3, when the magnetic plates 24 pass through the stainless steel plates 27, the elastic plates 27 restore the elastic connecting plates 25, the elastic plates 2 restore the elastic plates through the elastic connecting plates, the elastic plates 25 are fully reset, the elastic plates 2 are fully vibrated, the elastic materials are further vibrate in the die plates 2 are fully, and the vibration of the first die structure is further pressed, and the vibration materials are fully stressed, and the vibration of the vibration materials are further stressed, and the aim of the vibration of the first die plate is realized, and the vibration is achieved, and the vibration of the vibration is that the vibration is better, and the quality due to the vibration, and has the vibration, and the quality.
The telescopic unit 9 can use devices such as an air cylinder or an electric push rod, the lower end of the telescopic unit 9 is connected with the upper pressure plate 8 in a detachable mode, the maintenance is convenient, the pressurizing unit 29 can use devices such as an air cylinder, when the pressurizing unit 29 pumps air in the second chamber 18 into the first chamber 17 and the third chamber 19, the pressure in the second chamber 18 is reduced, at the moment, the two groups of die plates 3 can enable materials in the die assembly to extrude elastic plates at the side surface position of the second chamber 18 to deform and dent in an arc shape towards the inside of the second chamber 18 when being mutually close, the materials are pressed once, when the pressurizing unit 29 pumps air in the third chamber 19 and the first chamber 17 into the second chamber 18, the air pressure in the second chamber 18 is increased, the elastic plates are reset along with the increase of the air pressure in the second chamber 18, the materials in the die assembly are compressed again, the pressing density of the inner cavity of the neodymium iron boron magnetic materials can be improved, the whole mechanical performance of the neodymium iron boron magnetic materials is improved, the device adopts a secondary pressurizing pressing mode, the disposable pressing can not achieve the purpose of pressing the materials, and the practical purpose is achieved.
Claims (10)
1. The production process of the sintered NdFeB magnetic material is characterized by comprising the following steps of: the method comprises the following steps:
S1: raw material analysis, namely preparing raw material powder for manufacturing the neodymium iron boron magnetic material, detecting whether the performance of the raw material meets the standard, and replacing the raw material powder with the performance which does not meet the standard with the raw material powder with the performance which meets the standard;
s2: the formula is prepared into a raw material powder formula for manufacturing the neodymium iron boron magnetic material, and the formula comprises the following components in percentage by mass: 20% -23% of Nd,10% -13% of B,5% -10% of Co, 0% -0.3% of Cu,5% -8% of Nb,1% -1.3% of Zr,3% -5% of Al,2% -3% of Ga,1.5% -2% of Si and the balance of Fe;
s3: the preparation and molding are carried out, the materials are pressed and molded by molding equipment after the formula in S2 is subjected to melt spinning, hydrogen breaking, powder preparation, material mixing and sieving, isostatic pressing is carried out after the pressing and molding, and then the products are peeled, namely: stripping the product from the mould on the forming equipment to form a preliminary product;
s4: vacuum sintering, namely sintering and forming the primary product formed in the step S3 in a vacuum state to form a blank, wherein performance detection is required for the blank, warehousing is performed after the magnetic property, the strength, the hardness, the ductility, the heat resistance and the corrosiveness of the blank meet the requirements, and the blank is smashed and recycled when the performance is not in accordance with the requirements;
S5: finish machining, namely finishing the blanks after warehouse entry to form finished blanks, checking the finished blanks again, and carrying out finish machining operation again if the finished blanks are qualified for standby;
s6: electroplating, namely electroplating the finish machining blank, checking whether the electroplated blank is qualified or not after electroplating, packaging after the electroplated blank is qualified, and carrying out electroplating repair again when the electroplated blank is unqualified;
s7: and (3) warehousing finished products, namely warehousing the electroplated blanks subjected to the inspection in the step (S6) to form neodymium-iron-boron magnetic materials, waiting for delivery, and carrying out delivery inspection on the neodymium-iron-boron magnetic materials before delivery.
2. The process for producing a sintered neodymium-iron-boron magnetic material according to claim 1, wherein: the finish machining in the step S5 comprises the machining steps of centerless grinding, trepanning, hole washing, slicing, double-sided grinding, chamfering machining and the like.
3. The process for producing a sintered neodymium-iron-boron magnetic material according to claim 2, wherein: the centerless grinding is used for primarily grinding all surfaces of the blank, and the double-sided grinding is used for simultaneously grinding two sides of the blank, so that the consistency of the double-sided grinding quality of the blank is ensured.
4. A process for producing a sintered neodymium-iron-boron magnetic material according to claim 3, characterized in that: the trepanning is used for drilling holes in the neodymium iron boron magnetic material by using the bench drill, and the holes are cleaned by using the cleaning equipment, so that the positions of the holes are clean and the inner wall is smooth.
5. The process for producing a sintered NdFeB magnetic material according to claim 4, wherein: the forming equipment in S3 includes bottom plate (1), be provided with mould subassembly on bottom plate (1), the fixed welding in upper surface one side of bottom plate (1) has side support frame (11), and the fixed welding in upper end of side support frame (11) has upper base plate (10), and the fixed welding in lower surface of upper base plate (10) has second adapter sleeve (13), is connected with drive assembly on second adapter sleeve (13), the top of bottom plate (1) is provided with top clamp plate (8), drive assembly includes flexible unit (9), the upper end of flexible unit (9) is fixed on second adapter sleeve (13) through the screw rod, the fixed welding in upper surface middle part of top clamp plate (8) has first adapter sleeve (12), the lower extreme of flexible unit (9) is fixed on first adapter sleeve (12) through the screw rod, the mould subassembly includes mould board one (2) and mould board two (3), mould board one (2), mould board two (3) all are provided with two sets, mould board one (2), mould board two rectangle board (3) are the length that the mould board one is the mould board (2) is along the mould board (2) is two, and two end plates (3) are close to each other along the mould board one and are close to each other in the direction of the mould board (1) and are arranged along the length of mould board (2) respectively, the novel mold comprises a first mold plate (2), an auxiliary component I is arranged in the first mold plate (2), an auxiliary component II is arranged in the second mold plate (3), a first driving component for driving the first mold plate (2) to move is arranged on a bottom plate (1), and a second driving component for driving the second mold plate (3) to move is also arranged on the bottom plate (1).
6. The process for producing a sintered NdFeB magnetic material according to claim 5, wherein: the first driving assembly comprises a first supporting plate (4) fixedly welded on the upper surface of the bottom plate (1), a second pushing unit (7) is fixedly welded on one surface, close to the first die plate (2), of the first supporting plate (4), and a fourth connecting sleeve (15) for fixing the end part of the second pushing unit (7) through a screw rod is fixedly welded on the middle part of the first die plate (2).
7. The process for producing a sintered NdFeB magnetic material according to claim 6, wherein: the second driving assembly comprises a second supporting plate (5) fixedly welded on the upper surface of the bottom plate (1), a first pushing unit (6) is fixedly welded on one surface, close to the second die plate (3), of the second supporting plate (5), and a third connecting sleeve (14) for fixing the end part of the first pushing unit (6) through a screw rod is fixedly welded on the middle part of the second die plate (3).
8. The process for producing a sintered neodymium iron boron magnetic material according to claim 7, wherein: the length of the second die plate (3) is smaller than that of the first die plate (2), the length of the first die plate (2) is equal to the length and width of the bottom plate (1), and the length and width of the bottom plate (1) are equal to the length and width of the upper pressing plate (8) respectively.
9. The process for producing a sintered neodymium-iron-boron magnetic material according to claim 8, wherein: the auxiliary assembly is characterized in that the auxiliary assembly comprises a first inner groove (20) arranged in the first mold plate (2), a stainless steel plate (27), a first magnetic block (26) and a second magnetic block (28) are arranged in the first inner groove (20), the stainless steel plate (27) is movably arranged in the first inner groove (20) and is kept in a gap with the first inner groove (20) close to one side inner wall of the second mold plate (3), an elastic connecting plate (25) is fixedly welded on one surface of the stainless steel plate (27) far away from the second mold plate (3), one end of the elastic connecting plate (25) far away from the stainless steel plate (27) is fixed on one side inner wall of the first inner groove (20) far away from the second mold plate (3), the stainless steel plate (27), the first magnetic block (26) and the second magnetic block (28) are all arranged in multiple groups, the multiple groups of the stainless steel plate (27) are distributed at equal intervals along the length direction of the first mold plate (2), the multiple groups of the first magnetic block (26) and the second magnetic block (28) are distributed between the multiple groups of the stainless steel plate (27) in a staggered mode, and the first magnetic block (26) and the second magnetic block (28) are fixed on the same side of the first magnetic block (28) and the first magnetic block (28) on the opposite side.
10. The process for producing a sintered neodymium-iron-boron magnetic material according to claim 9, wherein: the auxiliary assembly comprises a second inner groove (21) arranged inside a mold plate II (3), a partition plate (16) is fixedly arranged in the second inner groove (21), the partition plate (16) divides the inside of the second inner groove (21) into a second cavity (18) positioned in the middle and a third cavity (19) positioned at two sides of the second cavity (18), a first cavity (17), one end, close to the first inner groove (20), of the third cavity (19) is provided with a supporting shaft (23), the supporting shaft (23) is distributed along the height direction of the mold plate II (3), a magnetic plate (24) is sleeved on the supporting shaft (23) in a rotating mode, two ends of the magnetic plate (24) are respectively an N pole and an S pole, the magnetic plate (24) is of an oval plate-shaped structure, an elastic metal sheet (22) which is movably blocked on two end sides of the magnetic plate (24) is arranged on one side inner wall of the third cavity (19), a pressurizing unit (29) is fixedly welded on the outer side face of the mold plate II (3), a main pipeline (29) is arranged on the pressurizing unit (30), a main pipeline (31) is arranged on the main pipeline (32), a third pipeline (32) is communicated with a third pipeline (32), and a third pipeline (32) is communicated with the third pipeline (31) The inner walls of the second cavity (18) and the first cavity (17) are elastic plates, and the inner walls of the second die plate (3) on one side of the second cavity (18) are elastic plates.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102436889A (en) * | 2011-11-16 | 2012-05-02 | 宁波同创强磁材料有限公司 | Low-weight-loss neodymium iron boron magnetic material with Titanium, zirconium and gallium compound addition and preparation method thereof |
| CN103839670A (en) * | 2014-03-18 | 2014-06-04 | 安徽大地熊新材料股份有限公司 | Method for preparing high-coercivity sintered Nd-Fe-B permanent magnet |
| CN110379580A (en) * | 2019-06-25 | 2019-10-25 | 宁波合力磁材技术有限公司 | A kind of neodymium-iron-boron preparation and the not neodymium iron boron magnetic body of cracky |
| CN112466643A (en) * | 2020-10-28 | 2021-03-09 | 杭州永磁集团有限公司 | Preparation method of sintered neodymium-iron-boron material |
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- 2022-04-21 CN CN202210418038.5A patent/CN114743786B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102436889A (en) * | 2011-11-16 | 2012-05-02 | 宁波同创强磁材料有限公司 | Low-weight-loss neodymium iron boron magnetic material with Titanium, zirconium and gallium compound addition and preparation method thereof |
| CN103839670A (en) * | 2014-03-18 | 2014-06-04 | 安徽大地熊新材料股份有限公司 | Method for preparing high-coercivity sintered Nd-Fe-B permanent magnet |
| CN110379580A (en) * | 2019-06-25 | 2019-10-25 | 宁波合力磁材技术有限公司 | A kind of neodymium-iron-boron preparation and the not neodymium iron boron magnetic body of cracky |
| CN112466643A (en) * | 2020-10-28 | 2021-03-09 | 杭州永磁集团有限公司 | Preparation method of sintered neodymium-iron-boron material |
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Denomination of invention: Production process of sintered neodymium iron boron magnetic materials Granted publication date: 20231117 Pledgee: Dongyang Branch of China Construction Bank Co.,Ltd. Pledgor: ZHEJIANG NANCI INDUSTRIAL CO.,LTD. Registration number: Y2024980033018 |
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