EP2851144B1 - Technological process for sintering of a rare earth permanently magnetic alloy and apparatus therefor - Google Patents
Technological process for sintering of a rare earth permanently magnetic alloy and apparatus therefor Download PDFInfo
- Publication number
- EP2851144B1 EP2851144B1 EP13853302.1A EP13853302A EP2851144B1 EP 2851144 B1 EP2851144 B1 EP 2851144B1 EP 13853302 A EP13853302 A EP 13853302A EP 2851144 B1 EP2851144 B1 EP 2851144B1
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- EP
- European Patent Office
- Prior art keywords
- sintering
- chamber
- isolating
- conveying vehicle
- furnace
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- 238000005245 sintering Methods 0.000 title claims description 119
- 238000000034 method Methods 0.000 title claims description 24
- 229910052761 rare earth metal Inorganic materials 0.000 title claims description 21
- 150000002910 rare earth metals Chemical class 0.000 title claims description 14
- 230000008569 process Effects 0.000 title claims description 8
- 229910000543 permanently magnetic alloy Inorganic materials 0.000 title 1
- 238000005096 rolling process Methods 0.000 claims description 72
- 239000011261 inert gas Substances 0.000 claims description 35
- 230000005540 biological transmission Effects 0.000 claims description 31
- 238000010438 heat treatment Methods 0.000 claims description 28
- 238000001816 cooling Methods 0.000 claims description 24
- 229910001004 magnetic alloy Inorganic materials 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 14
- 238000012546 transfer Methods 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910002804 graphite Inorganic materials 0.000 claims description 8
- 239000010439 graphite Substances 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims 1
- 230000032683 aging Effects 0.000 description 7
- 229910001172 neodymium magnet Inorganic materials 0.000 description 7
- -1 neodymium-iron-boron rare earth Chemical class 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000005056 compaction Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 239000000112 cooling gas Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C2202/00—Physical properties
-
- 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
- H01F1/06—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 in the form of particles, e.g. powder
- H01F1/08—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 in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/086—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 in the form of particles, e.g. powder pressed, sintered, or bound together sintered
Definitions
- the present invention relates to a field of processing rare earth permanent magnetic alloy, and more particularly to a method for sintering neodymium-iron-boron rare earth permanent magnetic alloy and a sintering equipment therefor.
- the neodymium-iron-boron rare earth permanent magnet is widely applied in electronic equipments, motors, hybrid vehicles, etc., and the application of the neodymium-iron-boron rare earth permanent magnet also becomes wider and wider.
- a conventional equipment for sintering neodymium-iron-boron rare earth permanent magnetic alloy comprises: a furnace body; a heating chamber provided in the furnace body; and a nozzle provided on a wall of the heating chamber; wherein a valve is provided at a side of the furnace body, the furnace body is connected with a seated glove box with a vacuum line via a valve, in such a manner that the problems of product oxidization, poor cooling uniformity, and poor consistency are effectively solved.
- the conventional equipment has problems of great investment, large area occupation, low automaticity, which is not able to realize non-oxidation during the whole process of sintering the neodymium-iron-boron rare earth permanent magnetic alloy.
- the present invention provides a sintering equipment according to claim 1, and a method for sintering a rare earth permanent magnetic alloy according to claim 11.
- Technical solutions of the present invention are as follows.
- a sintering equipment for flexibly sintering rare earth permanent magnetic alloy in the present invention comprises: a glove box, two conveying vehicles with sealed compartments, a press machine, a sintering furnace and a discharging vehicle; wherein two logistics channels are respectively provided at two ends of the glove box; the press machine and the sintering furnace are aligned at one side of the two logistics channels; the two conveying vehicles are able to move respectively in the two logistics channels; each of the two conveying vehicles, the sintering furnace and the press machine comprises an isolating valve provided at a corresponding end thereof; the glove box comprises two isolating valve respectively provided at the two ends thereof; and the two conveying vehicles are respectively coupled with the glove box, the press machine and the sintering furnace via the isolating valves.
- the glove box is a sealed box comprising two sealed chambers which are vacuum or filled with protective atmosphere.
- the two sealed chambers in the glove box are a first chamber and a second chamber.
- a second isolating valve is provided between the two sealed chambers.
- a first isolating valve and a third isolating valve are provided at two ends of the two sealed chamber.
- Each of the chambers comprises an evacuating pipeline, an inert gas inlet, an exhaust valve pipeline, a pressure gage and a vacuum gauge.
- a balance valve pipeline is provided between the two chambers for equalizing pressures of the two sealed chambers.
- a second rolling wheel transmission and a third rolling wheel transmission for a charging tray to place on are respectively provided in the two chambers, wherein the second chamber comprises a glove flange component.
- the conveying vehicle comprises an fifth isolating valve provided at a first end thereof, and a compartment door provided at a second end thereof.
- the conveying vehicles are respectively coupled with the glove box, the sintering furnace or the press machine, two connecting flanges of the two isolating valves are connected tightly to form a seal joint.
- first rolling wheel transmission for transferring material to the glove box and a fork mechanism for transferring the material to the sintering furnace are provided in the conveying vehicle.
- Universal wheels are provided at a bottom of the conveying vehicle.
- a first evacuating pipeline, an inert gas inlet and a first exhaust valve pipeline are provided on the conveying vehicle and connected with the conveying vehicle.
- the fork mechanism comprises a fork, a guiding track framework of rolling wheels, a screw driving component, a first speed reducer of motor and a first cylinder; wherein an output shaft of the first speed reducer of motor is connected with a first end of a screw of the screw driving component; a second end of the screw driving component is connected with the guiding track framework of rolling wheels which is supported by the first cylinder.
- the first rolling wheel transmission is installed on a compartment bottom via a supporter.
- first cylinder is fixed under the compartment.
- a cylinder rod of the first cylinder extends into the compartment and is connected with a connecting rod of a rolling wheel axle in the guiding track framework of rolling wheels, and a rolling wheel moves in a track of a first rolling wheel track component.
- the sintering furnace comprises: a fourth isolating valve provided at a first end thereof, which is also at one side of the logistics channel; and a furnace door provided at a second end thereof, which is locked with a high-pressure furnace ring for locking.
- a furnace chamber of the sintering furnace comprises a heating chamber provided therein, and a thermal insulating layer is provided in the heating chamber.
- a plurality of groups of heaters and thermocouples are provided in the thermal insulating layer. The heaters are connected with a heating power cabinet via a electrode provided on the heating chamber and a copper bar provided outside the heating chamber.
- a plurality of nozzles which are interconnected go through the thermal insulating layer in a radial direction of the furnace chamber.
- An outer wall of a furnace shell has a structure of double-layer water-cooling jacket, and water-cooling inlet and outlet pipelines are provided on the outer wall of the furnace shell.
- An inert gas inlet, a safety valve pipeline, an exhaust valve pipeline and a air cooling system are connected with the furnace chamber.
- the charging tray is placed on a charging shelf of the heating chamber in the sintering furnace by the fork in the first conveying vehicle.
- a balance valve pipeline is provided between the furnace chamber of the sintering furnace and the fourth isolating valve for equalizing pressures.
- the air cooling system having an outer circulation system or an inner circulation system comprises a fan, a heat exchanger, and a plurality of nozzles provided along the furnace chamber.
- An air duct which is connected with the nozzles has a first end connected with the fan, and a second end connected with the heat exchanger.
- a plurality of sintering furnaces are provided, the sintering furnaces are provided side by side in front of the logistics channel.
- the present invention adopts a parallel-type flexible production method.
- Sintering period of the neodymium-iron-boron rare earth permanent magnetic alloy is long, i.e. 24 hours. However, it only takes more than 1 hour to take the blanks of the neodymium-iron-boron rare earth permanent magnetic alloy out of the press machine, load the blanks into the graphite charging boxes manually in the glove box, and then pile the graphite charging boxes upon the charging tray. Therefore, a sealed glove box of a one-chamber sintering furnace in a conventional method is removed. Instead, a glove box is provided to operate with a plurality of one-chamber sintering furnaces with isolating valves. The conveying vehicles are coupled with the sintering furnace in the protective atmosphere.
- the present invention adopts a flexible production method, wherein the conveying vehicle is coupled with the press machine in the protective atmosphere, in such a manner that non-oxidation connection from compaction to sintering is realized, and magnet performance and automaticity of production are significantly improved.
- a sintering equipment for flexibly sintering rare earth permanent magnetic alloy in the present invention comprises: a glove box 1, a first conveying vehicle with a sealed compartment 2, a second conveying vehicle with a sealed compartment 6, a press machine 5, a sintering furnace 3 and a discharging vehicle 4; wherein two logistics channels are respectively provided at two ends of the glove box 1; the press machine 5 and the sintering furnace 3 are aligned at one side of the two logistics channels; the first conveying vehicle 2 and the second conveying vehicle 6 are able to move respectively in the two logistics channels; each of the first conveying vehicle 2, the second conveying vehicle 6, the sintering furnace 3 and the press machine 5 comprises an isolating valve provided at a corresponding end thereof; the glove box 1 comprises two isolating valve respectively provided at the two ends thereof; and the first conveying vehicle 2 and the second conveying vehicle 6 are respectively coupled with the glove box 1, the press machine 5 and the sintering furnace 3 via the isolating valve
- the glove box 1 is a sealed box comprising two sealed chambers which are vacuum or filled with protective atmosphere.
- the two sealed chambers in the glove box I are a first chamber 32 and a second chamber 38.
- a second isolating valve 36 is provided between the two sealed chambers.
- a first isolating valve 31 is provided at a first end of the first chamber 32, and a third isolating valve 43 is provided at a second end of the second chamber 38.
- Each of the chambers comprises an evacuating pipeline, an inert gas inlet, an exhaust valve pipeline, a pressure gage and a vacuum gauge.
- a balance valve pipeline is provided between the two chambers for equalizing pressures of the two chambers.
- a second rolling wheel transmission 46 and a third rolling wheel transmission 45 for a charging tray 44 to place on are respectively provided in the two chambers, wherein the second chamber 38 comprises a glove flange component 37 and a second electrical control cabinet 39.
- the first conveying vehicle 2 and the second conveying vehicle 6 have identical structure.
- Each of the first conveying vehicle 2 and the second conveying vehicle 6 comprises a fifth isolating valve 14 provided at a first end thereof and a compartment door 7 provided at a second end thereof.
- the first conveying vehicle 2 and the second conveying vehicle 6 are respectively coupled with the glove box 1, the sintering furnace 3 or the press machine 5, two connecting flanges of the two isolating valves are connected tightly to form a seal joint.
- Air between the fifth isolating valve 14 and the first isolating valve 31 or between the fifth isolating valve 14 and the third isolating valve 43 is evacuated by a fourth evacuating pipeline 30 provided in the fifth isolating valve 14 of the conveying vehicle or replaced with inert gas by an inert gas inlet provided in the fifth isolating valve 14 of the conveying vehicle.
- a first rolling wheel transmission 16 for conveying material to the glove box 1 and a fork mechanism for conveying the material to the sintering furnace 3 or the press machine 5 are provided in the conveying vehicle.
- Universal wheels 19 are provided at a bottom of the conveying vehicle.
- a first evacuating pipeline 12 An inert gas inlet and a first exhaust valve pipeline 8 are provided on the conveying vehicle and connected with the conveying vehicle.
- the fork mechanism comprises a fork 17, a guiding track framework of rolling wheels 20, a screw driving component 29, a first speed reducer of motor 18 and a first cylinder 27; wherein the first speed reducer of motor 18 is fixed on the guiding track framework of rolling wheels 20; an output shaft of the first speed reducer of motor 18 is connected with a first end of thescrew21; a second end of thescrew21 is connected with the guiding track framework of rolling wheels 20; the first cylinder 27 supports a rolling wheel axle of the guiding track framework of rolling wheels 20; the screw driving component 29 is fixed on the fork 17; the screw rotates to drive a nut in the screw driving component 29, and the nut further drives a rolling wheel of the fork 17 to roll along the guiding track framework of rolling wheels 20, in such a manner that the fork moves; and the first rolling wheel transmission 16 is installed on a compartment bottom 22 via a supporter 81.
- the first cylinder 27 is fixed under the compartment.
- a cylinder rod of the first cylinder 27 extends into the compartment and is connected with a connecting rod of the rolling wheel axle in the guiding track framework of rolling wheels 20 of the fork, and a rolling wheel moves in a track of a first rolling wheel track component 28.
- the first rolling wheel transmission 16, the second rolling wheel transmission 46 and the third rolling wheel transmission 45 have identical structures.
- the first rolling wheel transmission 16 is fixed in the conveying vehicle via the supporter 81, and the second rolling wheel transmission 46 and the third rolling wheel transmission 45 are fixed in the glove box 1 via the supporter 81.
- Each of the rolling wheel transmissions comprises a motor, a plurality of rolling wheel supporters, chain wheels and a chain; wherein the motor drives the chain wheels to rotate, in such a manner that the charging tray 44 on the rolling wheel transmission is driven to move.
- the first cylinder 27 drives the rolling wheels of the first rolling wheel track component 28 to move up and down along the track of the first rolling wheel track component 28.
- the first speed reducer of motor 18 drives the screw driving component 29, and the screw driving component 29 further drives the rolling wheel of the fork 17 moves horizontally along a track of the guiding track framework of rolling wheels 20, in such a manner that the fork 17 is able to move horizontally and vertically.
- At least one sintering furnace 3 is provided. If a plurality of sintering furnaces 3 are provided, the sintering furnaces 3 are provided side by side in front of the logistics channel.
- the sintering furnace 3 comprises a fourth isolating valve 56 provided at a first end thereof, which is also at one side of the logistics channel; and a furnace door 53 provided at a second end thereof, which is locked with a high-pressure furnace ring for locking 52.
- a furnace chamber of the sintering furnace 3 comprises a heating chamber provided therein, and a thermal insulating layer 59 is provided in the heating chamber.
- a plurality of groups of heaters 58 and thermocouples 55 are provided in the thermal insulating layer 59.
- the heaters 58 are connected with a heating power cabinet 48 via an electrode 54 provided on the heating chamber and a copper bar49 provided outside the heating chamber.
- a plurality of nozzles 60 which are interconnected go through the thermal insulating layer 59 in a radial direction of the furnace chamber.
- An outer wall of a furnace shell has a structure of double-layer water-cooling jacket, and water-cooling inlet and outlet pipelines 57 are provided on the outer wall of the furnace shell.
- An inert gas inlet, a safety valve pipeline 67, an exhaust valve pipeline 68 and a air cooling system are connected with the furnace chamber.
- the charging tray44 is placed on a charging shelf of the heating chamber in the sintering furnace by the fork 17 in the first conveying vehicle 2.
- a balance valve pipeline 69 is provided between the furnace chamber of the sintering furnace 3 and the fourth isolating valve 56 for equalizing pressures.
- the air cooling system having an outer circulation system or an inner circulation system comprises a fan 50, a heat exchanger 51, and a plurality of nozzles 60 provided along the furnace chamber.
- An air duct which is connected with the nozzles 60 has a first end connected with the fan 50, and a second end connected with the heat exchanger 51.
- a vacuum system comprises a diffusion pump 64, roots pump 63, rotary piston pump or rotary vane pump 62, and vacuum pipeline, wherein each of the diffusion pump 64, the roots pump 63, and the rotary piston pump or the rotary vane pump 62 comprises a high vacuum flapper valve 61 provided thereon.
- the isolating valve comprises a valve body, a second cylinder70, a water-cooling valve board 75 provided therein, a hinge plate 76, connecting rods 78, a second rolling wheel track component 77 and a block 79.
- the water-cooling valve board 75 is connected with the hinge plate 76 via the connecting rod s 78.
- a guiding track 24 of the second rolling wheel track component 77 is provided in the valve body.
- Each of the water-cooling valve board 75 and the hinge plate 76 comprises a rolling wheel 23 which is able to roll in the guiding track 24.
- the second cylinder 70 is provided outside the valve body.
- a cylinder rod of the second cylinder 70 extends into the valve body and is connected with the hinge plate76.
- the block 79 is provided on a valve bottom 25 in the valve body.
- the water-cooling valve board 75 comprises a rubber ring 74 provided at one end near a flange at valve port 26.
- the second cylinder 70 drives the hinge plate 76 to move on the guiding track 24, and then the water-cooling valve board 75 hits the block 79, wherein the connecting rod s 78 pushes water-cooling valve board 75 to move close to the flange at valve port 26 for compressing the rubber ring 74, in such a manner that the isolating valve is sealed.
- a axle of water inlet and outlet 72 of the water-cooling valve board 75 and the cylinder rod of the second cylinder 70 are linked via a connecting element 73.
- a thermal insulation board is provided on the water-cooling valve board 75.
- An upper flange 80 is provided on an upper portion of the valve body. When the isolating valve is in maintenance, the water-cooling valve board 75 is taken out of the valve body through an opening of the upper flange 80.
- An operational process of the present invention is as follows.
- Each of the glove box 1, the sintering furnace 3, the first conveying vehicle 2, the second conveying vehicle 6, and the press machine 5 comprises an independent electrical control cabinet. Decentralized operation mode is adopted, in such a manner that the equipments are in production status, i.e. vacuum system is started and the equipments are interlocking. The inert gas valve is opened and adjusted to a certain flow. All of the isolating valve, the furnace door and the compartment door are closed, and the heater is excellent without damage.
- Each of the first conveying vehicle 2 and the second conveying vehicle 6 comprises a sealed compartment.
- the compartment door 7 and the fifth isolating valve 14 are closed, and the first evacuating pipeline 12 is opened to evacuate the air in the compartment or replace the air in the compartment with inert gas.
- a first pressure gage 13 is for controlling pressure.
- First observation windows 9 are symmetrically provided at two sides of the compartment.
- a first electrical control cabinet 10, a second observation window 11, and the first exhaust valve pipeline 8 are provided on a roof for convenient operation.
- the universal wheel 19 of the second conveying vehicle 6 moves to drive the second conveying vehicle 6 to respectively coupled with the first isolating valve 31 of the glove box 1 and the press machine 5, wherein the second conveying vehicle 6 is located by a position switch.
- the universal wheel 19 of the first conveying vehicle 2 moves to drive the first conveying vehicle 2 to respectively coupled with the third isolating valve 43 of the first glove 1 and the sintering furnace 3, wherein the first conveying vehicle 2 is located by the position switch.
- an external control system is able to monitor status of equipments continuously, and the equipments run automatically according to a preset program. Whole operation is finished on a human-computer interface of the computer.
- a screen of the external control system provides following information, i.e. working status of the vacuum pumps, vacuum valves and the vacuum pipelines; driving the conveying vehicles and displaying transferring and operating status of the conveying vehicles; driving the isolating valves and displaying operating status of the isolating valves; displaying the pressures of the glove box 1, the sintering furnace 3, the first conveying vehicle 2, the second conveying vehicle 6 and the fifth isolating valve 14, and the temperature of the sintering furnace 3; operating status of the inert gas and the safety valve; actual pressures of the cooling water, dynamic gas pressure and alarm management; displaying all related technological parameters (set values and actual values); inputting parameters; and displaying and storing historical process parameters/data. All of the main elements in the equipments are able to be operated via the screen.
- the compacts are processed with vacuum sintering, and then the temperature is kept for 2 hours, wherein the vacuum degree is E-2Pa. Finally, the compacts are processed with aging in 900°C for two hours and aging in 500°C for four hours.
- Example 1 Materials are prepared according to the weight proportion in the comparison example, and then compacts are sintered by the sintering method in the present invention. Before the temperature is increased, the sintering furnace is evacuated. When vacuum degree is more than 1 Pa, the temperature is increased to 400 °C and then kept for 3 hours. The temperature in a heating furnace is repeatedly increased and then kept for some time in range of 400°C ⁇ 850°C. Afterwards, the temperature is increased to 850 °C and then kept for 2 hours, wherein the vacuum degree is 3E-2Pa. The temperature continues to be increased to 1080 °C and then kept for 2 hours, wherein the vacuum degree is E-2Pa. Finally, the compacts are processed with aging by the method described in the comparison example.
- Example 2 Materials are prepared according to the weight proportion in the comparison example, and then compacts are sintered by the sintering method in the present invention. Before the temperature is increased, the sintering furnace is evacuated. When vacuum degree is more than 1 Pa, the temperature is increased to 450 °C and then kept for 3 hours. The temperature in the heating furnace is repeatedly increased and then kept for some time in range of 450°C ⁇ 850°C. Afterwards, the temperature is increased to 850 °C and then kept for 2 hours, wherein the vacuum degree is 3E-2Pa. The temperature continues to be increased to 1080 °C and then kept for 2 hours, wherein the vacuum degree is E-2Pa. Finally, the compacts are processed with aging by the method described in the comparison example.
- Example 3 Materials are prepared according to the weight proportion in the comparison example, and then compacts are sintered by the sintering method in the present invention. Before the temperature is increased, the sintering furnace is evacuated. When vacuum degree is more than 1 Pa, the temperature is increased to 400°C and then kept for 3 hours. The temperature in the heating furnace is repeatedly increased and then kept for some time in range of 400°C ⁇ 900°C. Afterwards, the temperature is increased to 900 °C and then kept for 2 hours, wherein the vacuum degree is 3E-2Pa. The temperature continues to be increased to 1080 °C and then kept for 2 hours, wherein the vacuum degree is E-2Pa. Finally, the compacts are processed with aging by the method described in the comparison example.
- Example 4 Materials are prepared according to the weight proportion in the comparison example, and then compacts are sintered by the sintering method in the present invention. Before the temperature is increased, the sintering furnace is evacuated When vacuum degree is more than 1 Pa, the temperature is increased to 400°C and then kept for 3 hours. The temperature in the heating furnace is repeatedly increased and then kept for some time in range of 400°C ⁇ 900°C. Afterwards, the temperature is increased to 900 °C and then kept for 2 hours, wherein the vacuum degree is 3E-2Pa. The temperature continues to be increased to 1070 °C and then kept for 3 hours, wherein the vacuum degree is E-2Pa. Finally, the compacts are processed with aging by the method described in the comparison example.
- the sealed glove box of the one-chamber sintering furnace is removed.
- a glove box is provided to operate with a plurality of one-chamber sintering furnaces with isolating valves.
- the conveying vehicles are coupled with the sintering furnace and the press machine in the protective atmosphere, in such a manner that non-oxidation connection from compaction to sintering is realized.
- the method in the present invention significantly improves magnet performance and automaticity of production.
Description
- The present invention relates to a field of processing rare earth permanent magnetic alloy, and more particularly to a method for sintering neodymium-iron-boron rare earth permanent magnetic alloy and a sintering equipment therefor.
- The neodymium-iron-boron rare earth permanent magnet is widely applied in electronic equipments, motors, hybrid vehicles, etc., and the application of the neodymium-iron-boron rare earth permanent magnet also becomes wider and wider.
- Referring to the Chinese patent
CN 01248403.2 , a conventional equipment for sintering neodymium-iron-boron rare earth permanent magnetic alloy comprises: a furnace body; a heating chamber provided in the furnace body; and a nozzle provided on a wall of the heating chamber; wherein a valve is provided at a side of the furnace body, the furnace body is connected with a seated glove box with a vacuum line via a valve, in such a manner that the problems of product oxidization, poor cooling uniformity, and poor consistency are effectively solved. - The conventional equipment has problems of great investment, large area occupation, low automaticity, which is not able to realize non-oxidation during the whole process of sintering the neodymium-iron-boron rare earth permanent magnetic alloy.
- In order to solve above technical problems, the present invention provides a sintering equipment according to
claim 1, and a method for sintering a rare earth permanent magnetic alloy according toclaim 11. Technical solutions of the present invention are as follows. - Specific procedures are as follows.
- (1) Fine powder of rare earth permanent magnetic alloy is weighed, loaded in moulds, and orientedly compacted in a press machine and in inert atmosphere to obtain blanks. After the blanks compacted are loaded in charging boxes, the charging boxes are piled upon a charging tray. After a second conveying vehicle is coupled with the press machine , matching flanges of two isolating valves are locked tightly. After air between the two isolating valves is replaced with inert gas, the two isolating valves are opened. After a fork of the second conveying vehicle transfers the charging tray in the press machine into the second conveying vehicle, the two isolating valves are closed. The second conveying vehicle leaves and then is coupled with a first isolating valve of a first chamber in a glove box.
- (2) After air between the second conveying vehicle and the first isolating valve of the glove box is replaced with inert gas, the two isolating valves connected with each other are opened. After a first rolling wheel transmission in the second conveying vehicle transfers the charging tray into the first chamber of the glove box, the two isolating valves are closed, and the second conveying vehicle leaves. After a second isolating valve of the glove box is opened, material in the first chamber is transferred to a second chamber by rolling wheel transmissions, and then the second isolating valve is closed. The blanks are loaded into graphite charging boxes manually in the second chamber, and the graphite charging boxes are piled upon the charging tray.
- (3) After a first conveying vehicle is coupled with a third isolating valve at an end of the second chamber, two matching flanges of the two isolating valves are locked tightly. After air between the two isolating valves is replaced with inert gas, the two isolating valves connected with each other are opened. Rolling wheel transmissions in the second chamber and the first conveying vehicle are started to transfer the charging tray in the second chamber to the first conveying vehicle. Then the two isolating valves are closed, and the first conveying vehicle leaves.
- (4) After the first conveying vehicle is coupled with an isolating valve of a sintering furnace, matching flanges are locked tightly. After air between the two isolating valves is replaced with inert gas, a balance valve is opened to equalize pressures in the sintering furnace and the first conveying vehicle. After the pressures are equal, the two isolating valves connected with each other are opened. A fork mechanism in the first conveying vehicle which is horizontally driven by a screw rod and vertically driven by a cylinder is started to transfer the charging tray into the sintering furnace. Then the two isolating valves are closed, and the first conveying vehicle leaves.
- (5) After the sintering furnace is evacuated to a vacuum degree more than 50Pa, or the sintering furnace is filled with protective gas, the blanks are processed with heating and heat preservation according to a preset process curve. The blanks are sintered at a highest temperature of 1200°C. The sintering furnace is filled with nitrogen or argon to a pressure of 0.01 ∼ 0.03MPa. A fan is started to cool the charging boxes and the blanks of the rare earth permanent magnetic alloy therein, until the temperature is lower than 80 °C, and then the fan is stopped after at least 5 minutes. After the pressure in a furnace chamber is equal to atmosphere, the fourth isolating valve of the sintering furnace is opened. A fork of a discharging vehicle takes out the charging tray, the fourth isolating valve is closed, and then the discharging vehicle leaves.
- A sintering equipment for flexibly sintering rare earth permanent magnetic alloy in the present invention comprises: a glove box, two conveying vehicles with sealed compartments, a press machine, a sintering furnace and a discharging vehicle; wherein two logistics channels are respectively provided at two ends of the glove box; the press machine and the sintering furnace are aligned at one side of the two logistics channels; the two conveying vehicles are able to move respectively in the two logistics channels; each of the two conveying vehicles, the sintering furnace and the press machine comprises an isolating valve provided at a corresponding end thereof; the glove box comprises two isolating valve respectively provided at the two ends thereof; and the two conveying vehicles are respectively coupled with the glove box, the press machine and the sintering furnace via the isolating valves.
- Further, the glove box is a sealed box comprising two sealed chambers which are vacuum or filled with protective atmosphere. The two sealed chambers in the glove box are a first chamber and a second chamber. A second isolating valve is provided between the two sealed chambers. A first isolating valve and a third isolating valve are provided at two ends of the two sealed chamber. Each of the chambers comprises an evacuating pipeline, an inert gas inlet, an exhaust valve pipeline, a pressure gage and a vacuum gauge. A balance valve pipeline is provided between the two chambers for equalizing pressures of the two sealed chambers. A second rolling wheel transmission and a third rolling wheel transmission for a charging tray to place on are respectively provided in the two chambers, wherein the second chamber comprises a glove flange component.
- Further, the conveying vehicle comprises an fifth isolating valve provided at a first end thereof, and a compartment door provided at a second end thereof. When the conveying vehicles are respectively coupled with the glove box, the sintering furnace or the press machine, two connecting flanges of the two isolating valves are connected tightly to form a seal joint.
- Further, the first rolling wheel transmission for transferring material to the glove box and a fork mechanism for transferring the material to the sintering furnace are provided in the conveying vehicle. Universal wheels are provided at a bottom of the conveying vehicle. A first evacuating pipeline, an inert gas inlet and a first exhaust valve pipeline are provided on the conveying vehicle and connected with the conveying vehicle.
- Further, the fork mechanism comprises a fork, a guiding track framework of rolling wheels, a screw driving component, a first speed reducer of motor and a first cylinder; wherein an output shaft of the first speed reducer of motor is connected with a first end of a screw of the screw driving component; a second end of the screw driving component is connected with the guiding track framework of rolling wheels which is supported by the first cylinder. The first rolling wheel transmission is installed on a compartment bottom via a supporter.
- Further, the first cylinder is fixed under the compartment. A cylinder rod of the first cylinder extends into the compartment and is connected with a connecting rod of a rolling wheel axle in the guiding track framework of rolling wheels, and a rolling wheel moves in a track of a first rolling wheel track component.
- Further, at least one sintering furnace is provided. The sintering furnace comprises: a fourth isolating valve provided at a first end thereof, which is also at one side of the logistics channel; and a furnace door provided at a second end thereof, which is locked with a high-pressure furnace ring for locking. A furnace chamber of the sintering furnace comprises a heating chamber provided therein, and a thermal insulating layer is provided in the heating chamber. A plurality of groups of heaters and thermocouples are provided in the thermal insulating layer. The heaters are connected with a heating power cabinet via a electrode provided on the heating chamber and a copper bar provided outside the heating chamber. A plurality of nozzles which are interconnected go through the thermal insulating layer in a radial direction of the furnace chamber. An outer wall of a furnace shell has a structure of double-layer water-cooling jacket, and water-cooling inlet and outlet pipelines are provided on the outer wall of the furnace shell. An inert gas inlet, a safety valve pipeline, an exhaust valve pipeline and a air cooling system are connected with the furnace chamber. The charging tray is placed on a charging shelf of the heating chamber in the sintering furnace by the fork in the first conveying vehicle.
- Further, a balance valve pipeline is provided between the furnace chamber of the sintering furnace and the fourth isolating valve for equalizing pressures.
- Further, the air cooling system having an outer circulation system or an inner circulation system comprises a fan, a heat exchanger, and a plurality of nozzles provided along the furnace chamber. An air duct which is connected with the nozzles has a first end connected with the fan, and a second end connected with the heat exchanger.
- Preferably, a plurality of sintering furnaces are provided, the sintering furnaces are provided side by side in front of the logistics channel.
- The merits and beneficial effects are as follows.
- The present invention adopts a parallel-type flexible production method. Sintering period of the neodymium-iron-boron rare earth permanent magnetic alloy is long, i.e. 24 hours. However, it only takes more than 1 hour to take the blanks of the neodymium-iron-boron rare earth permanent magnetic alloy out of the press machine, load the blanks into the graphite charging boxes manually in the glove box, and then pile the graphite charging boxes upon the charging tray. Therefore, a sealed glove box of a one-chamber sintering furnace in a conventional method is removed. Instead, a glove box is provided to operate with a plurality of one-chamber sintering furnaces with isolating valves. The conveying vehicles are coupled with the sintering furnace in the protective atmosphere.
- The present invention adopts a flexible production method, wherein the conveying vehicle is coupled with the press machine in the protective atmosphere, in such a manner that non-oxidation connection from compaction to sintering is realized, and magnet performance and automaticity of production are significantly improved.
- These and other objectives, features, and advantages of the present invention will become apparent from the following detailed description, the accompanying drawings, and the appended claims.
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Fig. 1 is a sketch view of an equipment for flexibly sintering rare earth permanent magnetic alloy according to a preferred embodiment of the present invention. -
Fig. 2 is a sketch view of a structure of a conveying vehicle having a sealed compartment shown inFig. 1 . -
Fig. 3 is a sketch view of a structure of a glove box shown inFig. 1 . -
Fig. 4 is a sketch view of a structure of a sintering furnace shown inFig. 1 . -
Fig. 5 is a top view ofFig. 4 . -
Fig.6 is a sketch view of a structure of an isolating valve shown inFig. 1 . - 1, glove box; 2, first conveying vehicle with sealed compartment; 3, sintering furnace; 4, discharging vehicle; 5, press machine; 6, second conveying with sealed compartment; 7, compartment door; 8, first exhaust valve pipeline; 9, first observation window; 10, first electrical control cabinet; 11, second observation window; 12, first evacuating pipeline; 13, first pressure gage; 14, fifth isolating valve; 15, charging box; 16, first rolling wheel transmission; 17, fork; 18, first speed reducer of motor; 19, universal wheel; 20, guiding track framework of rolling wheels; 21, screw; 22, compartment bottom; 23, rolling wheel; 24, guiding track; 25, valve bottom; 26, flange; 27, first cylinder; 28, first rolling wheel track component; 29, screw driving component; 30, fourth evacuating pipeline; 31, first isolating valve; 32, first chamber; 33, second exhaust valve pipeline; 34, second evacuating pipeline; 35, second pressure gage; 36, second isolating valve; 37, glove flange component; 38, second chamber; 39, second electrical control cabinet; 40, third exhaust valve pipeline; 41, third evacuating pipeline; 42, third pressure gage; 43, third isolating valve; 44, charging tray; 45, third rolling wheel transmission; 46, second rolling wheel transmission; 47, third electrical control cabinet; 48, heating power cabinet; 49, copper bar; 50, fan; 51, heat exchanger; 52, furnace ring for locking; 53, furnace door; 54, electrode; 55, thermocouple; 56, fourth isolating valve; 57, water-cooling inlet and outlet pipeline; 58, heater; 59, thermal insulating layer; 60, nozzle; 61, high vacuum flapper valve; 62, rotary piston pump or rotary vane pump; 63, roots pump; 64, diffusion pump; 65, cold trap; 66, pressure gage of electric contact; 67, safety valve pipeline; 68, exhaust valve pipeline; 69, balance valve pipeline; 70, second cylinder; 71, magnetic switch; 72, axle of water inlet and outlet; 73, connecting element;; 74, rubber ring; 75, water-cooling valve board; 76, hinge plate; 77, second rolling wheel track component; 78, connecting rod; 79, block; 80, upper flange; 81, supporter.
- According to the drawings and embodiments, the present invention is further described as follows.
- Referring to
Fig. 1 , a sintering equipment for flexibly sintering rare earth permanent magnetic alloy in the present invention comprises: aglove box 1, a first conveying vehicle with a sealedcompartment 2, a second conveying vehicle with a sealedcompartment 6, apress machine 5, asintering furnace 3 and a dischargingvehicle 4; wherein two logistics channels are respectively provided at two ends of theglove box 1; thepress machine 5 and thesintering furnace 3 are aligned at one side of the two logistics channels; the first conveyingvehicle 2 and the second conveyingvehicle 6 are able to move respectively in the two logistics channels; each of the first conveyingvehicle 2, the second conveyingvehicle 6, thesintering furnace 3 and thepress machine 5 comprises an isolating valve provided at a corresponding end thereof; theglove box 1 comprises two isolating valve respectively provided at the two ends thereof; and the first conveyingvehicle 2 and the second conveyingvehicle 6 are respectively coupled with theglove box 1, thepress machine 5 and thesintering furnace 3 via the isolating valves. Preferably, a plurality ofsintering furnaces 3 and a plurality of thepress machines 5 could be provided side by side. - Referring to
Fig. 3 , theglove box 1 is a sealed box comprising two sealed chambers which are vacuum or filled with protective atmosphere. The two sealed chambers in the glove box I are afirst chamber 32 and asecond chamber 38. A second isolatingvalve 36 is provided between the two sealed chambers. A first isolatingvalve 31 is provided at a first end of thefirst chamber 32, and a third isolatingvalve 43 is provided at a second end of thesecond chamber 38. Each of the chambers comprises an evacuating pipeline, an inert gas inlet, an exhaust valve pipeline, a pressure gage and a vacuum gauge. A balance valve pipeline is provided between the two chambers for equalizing pressures of the two chambers. A secondrolling wheel transmission 46 and a thirdrolling wheel transmission 45 for a chargingtray 44 to place on are respectively provided in the two chambers, wherein thesecond chamber 38 comprises aglove flange component 37 and a secondelectrical control cabinet 39. - Referring to
Fig. 1 , the first conveyingvehicle 2 and the second conveyingvehicle 6 have identical structure. Each of the first conveyingvehicle 2 and the second conveyingvehicle 6 comprises a fifth isolatingvalve 14 provided at a first end thereof and acompartment door 7 provided at a second end thereof. When the first conveyingvehicle 2 and the second conveyingvehicle 6 are respectively coupled with theglove box 1, thesintering furnace 3 or thepress machine 5, two connecting flanges of the two isolating valves are connected tightly to form a seal joint. Air between the fifth isolatingvalve 14 and the first isolatingvalve 31 or between the fifth isolatingvalve 14 and the third isolatingvalve 43 is evacuated by a fourth evacuatingpipeline 30 provided in the fifth isolatingvalve 14 of the conveying vehicle or replaced with inert gas by an inert gas inlet provided in the fifth isolatingvalve 14 of the conveying vehicle. - Referring to
Fig. 2 , a firstrolling wheel transmission 16 for conveying material to theglove box 1 and a fork mechanism for conveying the material to thesintering furnace 3 or thepress machine 5 are provided in the conveying vehicle.Universal wheels 19 are provided at a bottom of the conveying vehicle. A first evacuatingpipeline 12, An inert gas inlet and a firstexhaust valve pipeline 8 are provided on the conveying vehicle and connected with the conveying vehicle. - The fork mechanism comprises a
fork 17, a guiding track framework of rolling wheels 20, a screw driving component 29, a first speed reducer ofmotor 18 and afirst cylinder 27; wherein the first speed reducer ofmotor 18 is fixed on the guiding track framework of rolling wheels 20; an output shaft of the first speed reducer ofmotor 18 is connected with a first end of thescrew21; a second end of thescrew21 is connected with the guiding track framework of rolling wheels 20; thefirst cylinder 27 supports a rolling wheel axle of the guiding track framework of rolling wheels 20; the screw driving component 29 is fixed on thefork 17; the screw rotates to drive a nut in the screw driving component 29, and the nut further drives a rolling wheel of thefork 17 to roll along the guiding track framework of rolling wheels 20, in such a manner that the fork moves; and the firstrolling wheel transmission 16 is installed on a compartment bottom 22 via asupporter 81. Thefirst cylinder 27 is fixed under the compartment. A cylinder rod of thefirst cylinder 27 extends into the compartment and is connected with a connecting rod of the rolling wheel axle in the guiding track framework of rolling wheels 20 of the fork, and a rolling wheel moves in a track of a first rollingwheel track component 28. The firstrolling wheel transmission 16, the secondrolling wheel transmission 46 and the thirdrolling wheel transmission 45 have identical structures. The firstrolling wheel transmission 16 is fixed in the conveying vehicle via thesupporter 81, and the secondrolling wheel transmission 46 and the thirdrolling wheel transmission 45 are fixed in theglove box 1 via thesupporter 81. Each of the rolling wheel transmissions comprises a motor, a plurality of rolling wheel supporters, chain wheels and a chain; wherein the motor drives the chain wheels to rotate, in such a manner that the chargingtray 44 on the rolling wheel transmission is driven to move. At work status, thefirst cylinder 27 drives the rolling wheels of the first rollingwheel track component 28 to move up and down along the track of the first rollingwheel track component 28. The first speed reducer ofmotor 18 drives the screw driving component 29, and the screw driving component 29 further drives the rolling wheel of thefork 17 moves horizontally along a track of the guiding track framework of rolling wheels 20, in such a manner that thefork 17 is able to move horizontally and vertically. - Referring to
Fig. 4 andFig. 5 , at least onesintering furnace 3 is provided. If a plurality ofsintering furnaces 3 are provided, thesintering furnaces 3 are provided side by side in front of the logistics channel. Thesintering furnace 3 comprises a fourth isolatingvalve 56 provided at a first end thereof, which is also at one side of the logistics channel; and afurnace door 53 provided at a second end thereof, which is locked with a high-pressure furnace ring for locking 52. A furnace chamber of thesintering furnace 3 comprises a heating chamber provided therein, and a thermal insulatinglayer 59 is provided in the heating chamber. A plurality of groups ofheaters 58 andthermocouples 55 are provided in the thermal insulatinglayer 59. Theheaters 58 are connected with aheating power cabinet 48 via anelectrode 54 provided on the heating chamber and a copper bar49 provided outside the heating chamber. A plurality ofnozzles 60 which are interconnected go through the thermal insulatinglayer 59 in a radial direction of the furnace chamber. An outer wall of a furnace shell has a structure of double-layer water-cooling jacket, and water-cooling inlet andoutlet pipelines 57 are provided on the outer wall of the furnace shell. An inert gas inlet, asafety valve pipeline 67, anexhaust valve pipeline 68 and a air cooling system are connected with the furnace chamber. The charging tray44 is placed on a charging shelf of the heating chamber in the sintering furnace by thefork 17 in the first conveyingvehicle 2. Abalance valve pipeline 69 is provided between the furnace chamber of thesintering furnace 3 and the fourth isolatingvalve 56 for equalizing pressures. - The air cooling system having an outer circulation system or an inner circulation system comprises a
fan 50, aheat exchanger 51, and a plurality ofnozzles 60 provided along the furnace chamber. An air duct which is connected with thenozzles 60 has a first end connected with thefan 50, and a second end connected with theheat exchanger 51. - A vacuum system comprises a
diffusion pump 64, roots pump 63, rotary piston pump orrotary vane pump 62, and vacuum pipeline, wherein each of thediffusion pump 64, the roots pump 63, and the rotary piston pump or therotary vane pump 62 comprises a highvacuum flapper valve 61 provided thereon. - Referring to
Fig. 6 , all of the isolating valves are sealed in one-way and have structures of gate valve. The isolating valve comprises a valve body, a second cylinder70, a water-coolingvalve board 75 provided therein, ahinge plate 76, connectingrods 78, a second rollingwheel track component 77 and ablock 79. The water-coolingvalve board 75 is connected with thehinge plate 76 via the connectingrod s 78. A guidingtrack 24 of the second rollingwheel track component 77 is provided in the valve body. Each of the water-coolingvalve board 75 and thehinge plate 76 comprises a rollingwheel 23 which is able to roll in the guidingtrack 24. Thesecond cylinder 70 is provided outside the valve body. A cylinder rod of thesecond cylinder 70 extends into the valve body and is connected with the hinge plate76. Theblock 79 is provided on a valve bottom 25 in the valve body. The water-coolingvalve board 75 comprises arubber ring 74 provided at one end near a flange atvalve port 26. Thesecond cylinder 70 drives thehinge plate 76 to move on the guidingtrack 24, and then the water-coolingvalve board 75 hits theblock 79, wherein the connecting rod s 78 pushes water-coolingvalve board 75 to move close to the flange atvalve port 26 for compressing therubber ring 74, in such a manner that the isolating valve is sealed. A axle of water inlet andoutlet 72 of the water-coolingvalve board 75 and the cylinder rod of thesecond cylinder 70 are linked via a connectingelement 73. A thermal insulation board is provided on the water-coolingvalve board 75. Anupper flange 80 is provided on an upper portion of the valve body. When the isolating valve is in maintenance, the water-coolingvalve board 75 is taken out of the valve body through an opening of theupper flange 80. - An operational process of the present invention is as follows.
- Power source, gas source, circulating cooling water and gas source of medium are checked. All of main equipments and auxiliary equipments are checked to ensure excellent without damage and in working status. Each of the
glove box 1, thesintering furnace 3, the first conveyingvehicle 2, the second conveyingvehicle 6, and thepress machine 5 comprises an independent electrical control cabinet. Decentralized operation mode is adopted, in such a manner that the equipments are in production status, i.e. vacuum system is started and the equipments are interlocking. The inert gas valve is opened and adjusted to a certain flow. All of the isolating valve, the furnace door and the compartment door are closed, and the heater is excellent without damage. - Each of the first conveying
vehicle 2 and the second conveyingvehicle 6 comprises a sealed compartment. At working status, thecompartment door 7 and the fifth isolatingvalve 14 are closed, and the first evacuatingpipeline 12 is opened to evacuate the air in the compartment or replace the air in the compartment with inert gas. Afirst pressure gage 13 is for controlling pressure.First observation windows 9 are symmetrically provided at two sides of the compartment. A firstelectrical control cabinet 10, asecond observation window 11, and the firstexhaust valve pipeline 8 are provided on a roof for convenient operation. Theuniversal wheel 19 of the second conveyingvehicle 6 moves to drive the second conveyingvehicle 6 to respectively coupled with the first isolatingvalve 31 of theglove box 1 and thepress machine 5, wherein the second conveyingvehicle 6 is located by a position switch. Theuniversal wheel 19 of the first conveyingvehicle 2 moves to drive the first conveyingvehicle 2 to respectively coupled with the third isolatingvalve 43 of thefirst glove 1 and thesintering furnace 3, wherein the first conveyingvehicle 2 is located by the position switch. - (1) Fine powder of rare earth permanent magnetic alloy is weighed, loaded in moulds, and orientedly compacted in the press machine and in inert atmosphere to obtain blanks. After the blanks compacted are loaded in charging
boxes 15, the chargingboxes 15 are piled upon the chargingtray 44. After the second conveyingvehicle 6 is coupled with thepress machine 5, matching flanges of the two isolating valves are locked tightly. After air between the two isolating valves is replaced with inert gas, the two isolating valves connected with each other are opened; wherein the fourth evacuatingpipeline 30 is opened to evacuate a holding chamber between the two isolating valves, a vacuum pump is stopped, and then the holding chamber is filled with the inert gas by the inert gas inlet; after the compartment of the second conveyingvehicle 6 and thepress machine 5 have equal pressures, the two isolating valves are opened. The fork of the second conveyingvehicle 6 is started to take the charging tray44 carrying the chargingboxes 15 out of thepress machine 5, and the fork transfers the charging tray44 into the second conveyingvehicle 6. Then the two isolating valves are closed, and the matching flanges which have been locked tightly are unlocked. The second conveyingvehicle 6 leaves thepress machine 5, and then the second conveyingvehicle 6 is coupled with the first isolatingvalve 31 of the first chamber in theglove box 1. - (2) The second conveying
vehicle 6 moves to a position of theglove box 1, and is coupled with the first isolatingvalve 31 of theglove box 1, and then two matching flanges of the two isolating valves are locked tightly. After air between the fifth isolating valve and the first isolating valve is replaced with inert gas, the two isolating valves connected with each other are opened; wherein the fourth evacuatingpipeline 30 is opened to evacuate a holding chamber between the fifth isolatingvalve 14 and the first isolatingvalve 31, a vacuum pump is stopped, and then the holding chamber is filled with the inert gas by the inert gas inlet; after the compartment of the second conveyingvehicle 6 and thefirst chamber 32 have equal pressures, the fifth isolatingvalve 14 and the first isolatingvalve 31 are opened. The first rolling wheel transmission16 and the secondrolling wheel transmission 46 are started to transfer the chargingtray 44 carrying the chargingboxes 15 into thefirst chamber 32. The fifth isolatingvalve 14 and the first isolatingvalve 31 are closed, the matching flanges of the two isolating valves which has been locked tightly are unlocked, and then the second conveyingvehicle 6 leaves. After thefirst chamber 32 and thesecond chamber 38 have equal pressures, the second isolatingvalve 36 of thefirst glove box 1 is opened. The second rolling wheel transmission46 and the third rolling wheel transmission45 are started to transfer the chargingtray 44 carrying the chargingboxes 15 from thefirst chamber 32 to thesecond chamber 38, and then the second isolating valve is closed. The blanks are loaded into graphite charging boxes manually in the second chamber, and the graphite charging boxes are piled upon the charging tray44. - (3) The first conveying vehicle moves to one end of the
first glove box 1 which is close to the second chamber, and is coupled with the third isolatingvalve 43. Two matching flanges of the two isolating valves are locked tightly. After air between the two isolating valves is replaced with inert gas, the fifth isolating valve and the third isolating valve connected are opened; wherein the fourth evacuatingpipeline 30 is opened to evacuate a holding chamber between the fifth isolatingvalve 14 and the third isolatingvalve 43, the vacuum pump is stopped, and then the holding chamber is filled with the inert gas by the inert gas inlet; after the compartment of the first conveyingvehicle 2 and thesecond chamber 38 have equal pressures, the fifth isolatingvalve 14 and the third isolatingvalve 43 are opened. The firstrolling wheel transmission 16 and the third rolling wheel transmission45 in the second chamber are started to transfer the chargingtray 44 carrying the chargingboxes 15 from the second chamber to the first conveying vehicle, and then the fifth isolatingvalve 14 and third isolatingvalve 43 are closed. The matching flanges of the fifth isolatingvalve 14 and the third isolatingvalve 43 which have been locked tightly are unlocked, and then the first conveyingvehicle 2 leaves. - (4) The first conveying
vehicle 2 moves a position of thesintering furnace 3 and is coupled with the fourth isolatingvalve 56. Matching flanges of the fifth isolatingvalve 14 and the fourth isolatingvalve 56 are locked tightly. After air between the fifth isolatingvalve 14 and the fourth isolatingvalve 56 is replaced with inert gas, a balance valve is opened to equalize pressures in the sintering furnace and the first conveying vehicle, and then the fifth isolatingvalve 14 and the fourth isolatingvalve 56 connected with each other are opened, wherein the fourth evacuatingpipeline 30 is opened to evacuate a holding chamber between the fifth isolatingvalve 14 and the fourth isolatingvalve 56, the vacuum pump is stopped, and then the holding chamber is filled with the inert gas by the inert gas inlet; after the first conveyingvehicle 2 and thesintering furnace 3 have equal pressures, the fifth isolatingvalve 14 and the fourth isolatingvalve 56 are opened. The first speed reducer ofmotor 18 is started, and the screw driving component 29 drives thefork 17 to extend into thesintering furnace 3. Thefirst cylinder 27 drives thefork 17 to moves downward along the first rollingwheel track component 28. The chargingtray 44 is placed on the charging shelf of thesintering furnace 3, and thefork 17 goes back to the first conveyingvehicle 2. The fourth isolatingvalve 56 and the fifth isolatingvalve 14 are closed, the matching flanges thereof which have been locked tightly are unlocked, and then the first conveyingvehicle 2 leaves. - (5) After the
sintering furnace 3 is evacuated to a vacuum degree more than 50Pa, or thesintering furnace 3 is filled with protective gas, the blanks are processed with heating and heat preservation according to a preset process curve. The blanks are sintered at a highest temperature of 1200 °C. Thesintering furnace 3 is filled with inert gas, such as nitrogen or argon, to a pressure of 0.01∼0.03MPa. Thefan 50 is started to cool the chargingboxes 15 and the blanks of the rare earth permanent magnetic alloy therein, wherein cooling gas blows to the charging boxes15 via thenozzle 60 of the air duct; the gas which has been heated is cooled circularly by theheat exchanger 51 having high efficiency under driving of thefan 50. The secondelectrical control cabinet 39 electrically controls thesintering furnace 3. When the temperature is lower than 80°C, the fan is stopped after at least 5 minutes. The furnace chamber is filled with gas by theexhaust valve pipeline 68. After the pressure in the furnace chamber is equal to atmosphere, the fourth isolating valve of thesintering furnace 3 is opened. A fork of the dischargingvehicle 4 takes the chargingtray 44 out of thesintering furnace 3, the fourth isolating valve is closed, and then the dischargingvehicle 4 leaves. - During productive process, an external control system is able to monitor status of equipments continuously, and the equipments run automatically according to a preset program. Whole operation is finished on a human-computer interface of the computer.
- A screen of the external control system provides following information, i.e. working status of the vacuum pumps, vacuum valves and the vacuum pipelines; driving the conveying vehicles and displaying transferring and operating status of the conveying vehicles; driving the isolating valves and displaying operating status of the isolating valves; displaying the pressures of the
glove box 1, thesintering furnace 3, the first conveyingvehicle 2, the second conveyingvehicle 6 and the fifth isolatingvalve 14, and the temperature of thesintering furnace 3; operating status of the inert gas and the safety valve; actual pressures of the cooling water, dynamic gas pressure and alarm management; displaying all related technological parameters (set values and actual values); inputting parameters; and displaying and storing historical process parameters/data. All of the main elements in the equipments are able to be operated via the screen. - Products respectively produced according to techniques in the present invention and conventional techniques have different performances which are compared as follows.
- Comparison example: Materials are prepared according to weight proportion as: 18% Nd , 8.5% Pr, 3% Dy, 1.02 %B, 0.3% Al and balance being Fe. After smelting, hydrogen pulverization, jet mill, and magnetic compaction, compacts are sintered in a one-chamber sintering furnace with a protective glove box which has been evacuated. A temperature is increased to 430°C, and then the compacts are processed with vacuum heat preservation for 3 hours, wherein vacuum degree is higher than 1 Pa. After the heat preservation, the temperature is increased to 850°C, and then the temperature is kept for 2 hours. Afterwards, when the temperature is increased to 1080 °C , the compacts are processed with vacuum sintering, and then the temperature is kept for 2 hours, wherein the vacuum degree is E-2Pa. Finally, the compacts are processed with aging in 900°C for two hours and aging in 500°C for four hours.
- Example 1: Materials are prepared according to the weight proportion in the comparison example, and then compacts are sintered by the sintering method in the present invention. Before the temperature is increased, the sintering furnace is evacuated. When vacuum degree is more than 1 Pa, the temperature is increased to 400 °C and then kept for 3 hours. The temperature in a heating furnace is repeatedly increased and then kept for some time in range of 400°C∼850°C. Afterwards, the temperature is increased to 850 °C and then kept for 2 hours, wherein the vacuum degree is 3E-2Pa. The temperature continues to be increased to 1080 °C and then kept for 2 hours, wherein the vacuum degree is E-2Pa. Finally, the compacts are processed with aging by the method described in the comparison example.
- Example 2: Materials are prepared according to the weight proportion in the comparison example, and then compacts are sintered by the sintering method in the present invention. Before the temperature is increased, the sintering furnace is evacuated. When vacuum degree is more than 1 Pa, the temperature is increased to 450 °C and then kept for 3 hours. The temperature in the heating furnace is repeatedly increased and then kept for some time in range of 450°C∼850°C. Afterwards, the temperature is increased to 850 °C and then kept for 2 hours, wherein the vacuum degree is 3E-2Pa. The temperature continues to be increased to 1080 °C and then kept for 2 hours, wherein the vacuum degree is E-2Pa. Finally, the compacts are processed with aging by the method described in the comparison example.
- Example 3: Materials are prepared according to the weight proportion in the comparison example, and then compacts are sintered by the sintering method in the present invention. Before the temperature is increased, the sintering furnace is evacuated. When vacuum degree is more than 1 Pa, the temperature is increased to 400°C and then kept for 3 hours. The temperature in the heating furnace is repeatedly increased and then kept for some time in range of 400°C∼900°C. Afterwards, the temperature is increased to 900 °C and then kept for 2 hours, wherein the vacuum degree is 3E-2Pa. The temperature continues to be increased to 1080 °C and then kept for 2 hours, wherein the vacuum degree is E-2Pa. Finally, the compacts are processed with aging by the method described in the comparison example.
- Example 4: Materials are prepared according to the weight proportion in the comparison example, and then compacts are sintered by the sintering method in the present invention. Before the temperature is increased, the sintering furnace is evacuated When vacuum degree is more than 1 Pa, the temperature is increased to 400°C and then kept for 3 hours. The temperature in the heating furnace is repeatedly increased and then kept for some time in range of 400°C∼900°C. Afterwards, the temperature is increased to 900 °C and then kept for 2 hours, wherein the vacuum degree is 3E-2Pa. The temperature continues to be increased to 1070 °C and then kept for 3 hours, wherein the vacuum degree is E-2Pa. Finally, the compacts are processed with aging by the method described in the comparison example.
- Example 5: Materials are prepared according to the weight proportion in the comparison example, and then compacts are sintered by the sintering method in the present invention. Before the temperature is increased, the sintering furnace is evacuated. When vacuum degree is more than 1 Pa, the temperature is increased to 500 °C and then kept for 3 hours. The temperature in the heating furnace is repeatedly increased and then kept for some time in range of 500°C∼900°C. Afterwards, the temperature is increased to 900 °C and then kept for 2 hours, wherein the vacuum degree is 3E-2Pa. The temperature continues to be increased to 1070°C and then kept for 3 hours, wherein the vacuum degree is E-2Pa. Finally, the compacts are processed with aging by the method described in the comparison example (10KGs = 1T and IKOe = 795774.7A/m).
- From the above examples, in a parallel-type flexible production method of the present invention, the sealed glove box of the one-chamber sintering furnace is removed. Instead, a glove box is provided to operate with a plurality of one-chamber sintering furnaces with isolating valves. The conveying vehicles are coupled with the sintering furnace and the press machine in the protective atmosphere, in such a manner that non-oxidation connection from compaction to sintering is realized. Compared with the conventional method adopting the sintering furnace with the glove box, the method in the present invention significantly improves magnet performance and automaticity of production.
- One skilled in the art will understand that the embodiment of the present invention as shown in the drawings and described above is exemplary only and not intended to be limiting.
- It will thus be seen that the objects of the present invention have been fully and effectively accomplished. Its embodiments have been shown and described for the purposes of illustrating the functional and structural principles of the present invention and is subject to change without departure from such principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims.
Claims (11)
- A sintering equipment for sintering a rare earth permanent magnetic alloy comprising: a glove box (1) having two ends, two conveying vehicles each provided with a sealed compartment (2, 6), a press machine (5), a sintering furnace (3) and a discharging vehicle (4) and two logistic channels; wherein a respective logistics channel is provided at a respective end of said glove box (1); said press machine (5) and said sintering furnace (3) are aligned at one side of said two logistics channels; said two conveying vehicles (2, 6) are able to move respectively in said two logistics channels; each of said two conveying vehicles (2, 6), said sintering furnace (3) and said press machine (5) having an isolating valve (14) provided at an end of each one of said two conveying vehicles (2, 6), said sintering furnace (3) and said press machine (5); and said glove box (1) comprises two isolating valves (31, 43), wherein a respective isolating valve is provided at a respective end of said glove box (1) and each of said two conveying vehicles (2, 6) can be respectively coupled with said glove box (1), said press machine (5) and said sintering furnace (3) via said isolating valves (14).
- The sintering equipment, as recited in claim 1, wherein said glove box (1) is a sealed box comprising two sealed chambers which are vacuum or filled with protective atmosphere; said two sealed chambers in said glove box are a first chamber (32) and a second chamber (38); a second isolating valve (36) is provided between said two sealed chambers; a first isolating valve (31) and a third isolating valve (43) are provided at two ends of said two sealed chambers (32, 38); each of said chambers comprises an evacuating pipeline (34, 41), an inert gas inlet, an exhaust valve pipeline (33, 40), a pressure gage (35, 42) and a vacuum gauge; a balance valve pipeline is provided between said two chambers for equalizing pressures of said two sealed chambers (32, 38); and a second rolling wheel transmission (46) and a third rolling wheel transmission (45) for a charging tray (44) to place on are respectively provided in said two chambers (32, 38), wherein said second chamber (38) comprises a glove flange component (37).
- The sintering equipment, as recited in claim 1, wherein each conveying vehicle (2, 6) comprises an isolating valve (14) provided at a first end thereof, and a compartment door (7) provided at a second end thereof; and when said conveying vehicle is respectively coupled with said glove box (1), said sintering furnace (3) or said press machine (5), two connecting flanges of said two isolating valves (14, 31, 43) are connected tightly to form a seal joint.
- The sintering equipment, as recited in claim 1, wherein said first rolling wheel transmission (16) for transferring material to said glove box (1) and a fork mechanism (17) for transferring said material to said sintering furnace (3) are provided in each conveying vehicle (2, 6); universal wheels (19) are provided at a bottom of said conveying vehicle (2, 6); and a first evacuating pipeline (12), an inert gas inlet and a first exhaust valve pipeline (8) are provided on said conveying vehicle (2, 6) and connected with said conveying vehicle (2, 6).
- The sintering equipment, as recited in claim 4, wherein said fork mechanism comprises a fork (17), a guiding track framework of rolling wheels (20), a screw driving component (29), a first speed reducer of motor (18) and a first cylinder (27); an output shaft of said first speed reducer of motor (18) is connected with a first end of a screw (21) of said screw driving component (29); a second end of said screw driving component (29) is connected with said guiding track framework of rolling wheels (20) which is supported by said first cylinder (27); and said first rolling wheel transmission (16) is installed on a compartment bottom (22) via a supporter (81).
- The sintering equipment, as recited in claim 5, wherein said first cylinder (27) is fixed under said compartment; a cylinder rod of said first cylinder (27) extends into said compartment and is connected with a connecting rod of a rolling wheel axle in said guiding track framework of rolling wheels (20); and a rolling wheel moves in a track of a first rolling wheel track component (28).
- The sintering equipment, as recited in claim 1, wherein at least one sintering furnace (3) is provided; said sintering furnace (3) comprises: a fourth isolating valve (56) provided at a first end thereof, which is also at one side of said logistics channel, and a furnace door (53) provided at a second end thereof, which is locked with a high-pressure furnace ring (52) for locking; a furnace chamber of said sintering furnace (3) comprises a heating chamber provided therein, and a thermal insulating layer (59) is provided in said heating chamber; a plurality of groups of heaters (58) and thermocouples (55) are provided in said thermal insulating layer (59); said heaters (58) are connected with a heating power cabinet (48) via an electrode (54) provided on said heating chamber and a copper bar (49) provided outside said heating chamber; a plurality of nozzles (60) which are interconnected go through said thermal insulating layer (59) in a radial direction of said furnace chamber; an outer wall of a furnace shell has a structure of double-layer water-cooling jacket, and water-cooling inlet and outlet pipelines (57) are provided on said outer wall of said furnace shell; an inert gas inlet, a safety valve pipeline (67), an exhaust valve pipeline (68) and an air cooling system are connected with said furnace chamber; and said charging tray is placed on a charging shelf of said heating chamber in said sintering furnace by said fork (17) in said first conveying vehicle (2).
- The sintering equipment, as recited in claim 7, wherein a balance valve pipeline (69) is provided between said furnace chamber of said sintering furnace (3) and said fourth isolating valve for equalizing pressures (56).
- The sintering equipment, as recited in claim 7, wherein said air cooling system having an outer circulation system or an inner circulation system comprises a fan (50), a heat exchanger (51), and a plurality of nozzles (60) provided along said furnace chamber; an air duct which is connected with said nozzles (60) has a first end connected with said fan (50), and a second end connected with said heat exchanger (51).
- The sintering equipment, as recited in claim 7, wherein a plurality of sintering furnaces (3) are provided, said sintering furnaces (3) are provided side by side in front of said logistics channel.
- A method for sintering a rare earth permanent magnetic alloy, using a sintering equipment as defined in any of claims 2 to 10, comprising:(1) weighing fine powder of rare earth permanent magnetic alloy, loading the fine powder in moulds, and orientedly compacting the fine powder in the press machine (5) and in inert atmosphere to obtain blanks; wherein after the blanks are loaded into charging boxes, the charging boxes are piled up on the charging tray (44); after the second conveying vehicle (6) is coupled with the press machine (5), matching flanges of two isolating valves (14) are locked tightly; after air between the two isolating valves (14) is replaced with inert gas, the two isolating valves (14) connected with each other are opened; after the fork mechanism (17) of the second conveying vehicle (6) transferred the charging tray from the press machine (5) into the second conveying vehicle (6), the two isolating valves (14) are closed; and the second conveying vehicle (6) is then coupled with the first isolating valve (31) of the first chamber (32) of the glove box (1);(2) after air between the second conveying vehicle (6) and the first isolating valve (31) of the glove box (1) has been replaced with inert gas, the two isolating valves (14, 31) connected with each other are opened; thereafter the first rolling wheel transmission (16) in the second conveying vehicle (6) transfers the charging tray (4) into the first chamber (32) of the glove box (1), the two isolating valves (14, 31) are closed, and the second conveying vehicle (6) id decoupled from the glove box (1); after the second isolating valve (36) of the glove box (1) is opened, material in the first chamber (32) is transferred to the second chamber (38) by rolling wheel transmissions (45, 46), and then the second isolating valve (36) is closed; and the blanks are loaded into graphite charging boxes manually in the second chamber (38), and the graphite charging boxes are piled up at the charging tray (44);(3) after the first conveying vehicle (2) is coupled with the third isolating valve (43) at the end of the second chamber (38), two matching flanges of the two isolating valves (43, 14) are locked tightly; after air between the two isolating valves (43, 14) has been replaced with inert gas, the two isolating valves (43, 14) connected with each other are opened; rolling wheel transmissions (45) in the second chamber (38) and the first conveying vehicle (2) are started to transfer the charging tray (44) from the second chamber (38) to the first conveying vehicle (2); the two isolating valves (43, 14) are closed; and then the first conveying vehicle (2) is decoupled from the glove box (1);(4) after the first conveying vehicle (2) is coupled with the isolating valve (56) of the sintering furnace (3), matching flanges are locked tightly; after air between the two isolating valves (14, 56) has been replaced with inert gas, the balance valve has been opened to equalize pressures in the sintering furnace (3) and the first conveying vehicle (2); after the pressures are equal, the two isolating valves (14, 56) connected with each other are opened; the fork mechanism in the first conveying vehicle (2) which is horizontally driven by a screw (21) and vertically driven by a cylinder (27) is started to transfer the charging tray (44) into the sintering furnace (3); the two isolating valves (14, 56) are closed; and then the first conveying vehicle (2) is decoupled; and(5) after the sintering furnace (3) is evacuated to a vacuum degree more than 50Pa, or the sintering furnace (3) is filled with protective gas, the blanks are heated and processed with a heat preservation according to a preset process curve; wherein the blanks are sintered at a highest temperature of 1200°C ; the sintering furnace is filled with nitrogen or argon to a pressure of 0.01 ∼ 0.03MPa; a fan (50) is started to cool the charging boxes and the blanks of the rare earth permanent magnetic alloy therein until the temperature is lower than 80°C, and then the fan (50) is stopped after at least 5 minutes; after the pressure in a furnace chamber is equal to atmosphere, the fourth isolating valve (56) of the sintering furnace (3) is opened; a fork of the discharging vehicle (4) takes out the charging tray (44), the fourth isolating valve (56) is closed, and then the discharging vehicle is decoupled.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201210445605.2A CN103801693B (en) | 2012-11-08 | 2012-11-08 | RE permanent magnetic alloy flexible sintered process |
PCT/CN2013/071356 WO2014071709A1 (en) | 2012-11-08 | 2013-02-05 | Technological process for flexible sintering of rare earth permanently magnetic alloy and apparatus therefor |
Publications (3)
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EP2851144A1 EP2851144A1 (en) | 2015-03-25 |
EP2851144A4 EP2851144A4 (en) | 2016-01-27 |
EP2851144B1 true EP2851144B1 (en) | 2018-01-17 |
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EP13853302.1A Active EP2851144B1 (en) | 2012-11-08 | 2013-02-05 | Technological process for sintering of a rare earth permanently magnetic alloy and apparatus therefor |
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EP (1) | EP2851144B1 (en) |
JP (1) | JP6043812B2 (en) |
CN (1) | CN103801693B (en) |
WO (1) | WO2014071709A1 (en) |
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CN104561568B (en) * | 2015-01-31 | 2016-10-26 | 西安海联石化科技有限公司 | Rare metal degassing processing means and method |
CN107321977B (en) * | 2016-04-29 | 2022-12-23 | 沈阳中北通磁科技股份有限公司 | Rare earth permanent magnet vacuum sintering method and vacuum sintering heat treatment equipment |
CN108747443A (en) * | 2018-07-09 | 2018-11-06 | 苏州鸿顺自动化设备有限公司 | A kind of new Machining Centre pallet |
CN109273230B (en) * | 2018-07-23 | 2020-06-23 | 沈阳中北真空技术有限公司 | Intelligent rare earth permanent magnet sintering production line and sintering method |
CN109301343A (en) * | 2018-10-24 | 2019-02-01 | 爱发科真空技术(沈阳)有限公司 | A kind of continuous lithium battery material device for making of multicell |
CN109579515A (en) * | 2018-11-26 | 2019-04-05 | 太原开元智能装备有限公司 | A kind of external-heat vacuum continuous fritting furnace |
CN109884992B (en) * | 2018-12-29 | 2021-08-03 | 湖南金炉科技股份有限公司 | Intermittent kiln sintering process setting system and method based on OCX control |
CN109765088B (en) * | 2019-01-23 | 2021-05-25 | 托特半导体(山东)有限公司 | Semiconductor material preparation equipment |
CN111504053B (en) * | 2020-05-09 | 2020-11-10 | 湖北华磁电子科技有限公司 | High-safety soft magnetic ferrite sintering furnace |
CN114322546B (en) * | 2020-09-30 | 2024-04-05 | 宝山钢铁股份有限公司 | Discharging method and device for rotary hearth furnace |
CN112735804B (en) * | 2020-12-28 | 2022-05-24 | 翼城县瑞科磁业有限公司 | Equipment for improving coercive force of sintered neodymium-iron-boron magnet |
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CN103801693A (en) | 2014-05-21 |
EP2851144A4 (en) | 2016-01-27 |
EP2851144A1 (en) | 2015-03-25 |
JP6043812B2 (en) | 2016-12-14 |
JP2015511271A (en) | 2015-04-16 |
WO2014071709A1 (en) | 2014-05-15 |
CN103801693B (en) | 2016-01-06 |
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