CN115283676B - Magnetic field pressure forming and isostatic pressing integrated machine - Google Patents
Magnetic field pressure forming and isostatic pressing integrated machine Download PDFInfo
- Publication number
- CN115283676B CN115283676B CN202211087490.4A CN202211087490A CN115283676B CN 115283676 B CN115283676 B CN 115283676B CN 202211087490 A CN202211087490 A CN 202211087490A CN 115283676 B CN115283676 B CN 115283676B
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- magnetic field
- die
- pressure forming
- rubber
- isostatic pressing
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- 238000000462 isostatic pressing Methods 0.000 title claims abstract description 38
- 229920001971 elastomer Polymers 0.000 claims abstract description 53
- 239000007788 liquid Substances 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000000843 powder Substances 0.000 claims abstract description 22
- 238000000465 moulding Methods 0.000 claims abstract description 16
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 9
- 229920002635 polyurethane Polymers 0.000 claims description 7
- 239000004814 polyurethane Substances 0.000 claims description 7
- -1 polyethylene Polymers 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 229910052761 rare earth metal Inorganic materials 0.000 abstract description 13
- 150000002910 rare earth metals Chemical class 0.000 abstract description 13
- 230000010354 integration Effects 0.000 abstract description 3
- 238000004806 packaging method and process Methods 0.000 description 4
- 239000002985 plastic film Substances 0.000 description 4
- 229920006255 plastic film Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000009694 cold isostatic pressing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/087—Compacting only using high energy impulses, e.g. magnetic field impulses
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention relates to forming equipment of rare earth permanent magnet powder, in particular to a magnetic field pressure forming and isostatic pressing integrated machine. The method solves the problem that the prior art is difficult to consider the advantages of the existing molding method and molding equipment. The magnetic field pressure forming and isostatic pressing integrated machine comprises a die with upper and lower openings, an upper punch, a lower punch and an orientation magnetic field device; the inner wall of the die is sleeved with a rubber inner die with upper and lower openings, the upper die punch and the lower die punch extend into the rubber inner die, and magnetic field pressure forming is carried out on powder added into the rubber inner die; the inner wall of the die is provided with an annular groove, the annular groove is filled with a liquid filling pressurizing bag, the liquid filling pressurizing bag is provided with a liquid filling nozzle, and the liquid filling nozzle extends out of the die. The invention creatively integrates the isostatic pressing structure on the existing magnetic field press, and the use process of the isostatic pressing structure maintains the reasonable procedures of magnetic field pressure forming and isostatic pressing of the existing forming method, thereby avoiding the deformation of the magnetic blank; meanwhile, through equipment integration, automation is convenient to realize.
Description
Technical Field
The invention relates to forming equipment of rare earth permanent magnet powder, in particular to a magnetic field pressure forming and isostatic pressing integrated machine.
Background
The current common forming method of rare earth permanent magnet powder comprises the following steps: firstly, performing low-density pressure forming (namely magnetic field pressure forming) on rare earth permanent magnet powder under magnetic field orientation by adopting a magnetic field press to ensure orientation degree; packaging the magnetic blank subjected to magnetic field pressure forming by using a plastic film, and carrying out isostatic pressing by using an isostatic pressing machine so as to improve density and uniformity; and then sintering to obtain the rare earth permanent magnet. The molding method has the recognized advantages, so that the molding method is widely used and popularized; however, due to operations such as plastic film packaging, cold isostatic pressing, plastic sealing film disassembly and the like, automation is difficult to realize, so that more operators exist at present, and pressure is brought to cost and quality management; meanwhile, two devices, namely a magnetic field press and an isostatic press, are needed, so that the investment is large and the maintenance is troublesome. For this reason, in the prior art, a magnetic field isostatic press is presented, rare earth permanent magnet powder is added into a rubber mold (also called a dry bag) of the magnetic field isostatic press, isostatic pressing is performed on the rare earth permanent magnet powder under the orientation of a magnetic field, and the obtained magnetic blank is directly sintered. Although the operations of plastic film packaging, plastic sealing film disassembling and the like are omitted, and working procedures are saved, the magnet blank subjected to magnetic field isostatic pressing is easy to deform, and the obtained magnet needs to be machined, so that rare earth permanent magnet powder is wasted. For this reason, from the viewpoint of the molding method, the process of magnetic field pressure molding is essentially omitted; the powder in the rubber mold is directly molded under isostatic pressure to make the resulting magnetic blank very deformable. Thus, it is difficult in the prior art to combine the advantages of existing molding methods and molding equipment, including magnetic field presses, isostatic presses, and magnetic field isostatic presses.
Disclosure of Invention
Aiming at the problem that the prior art is difficult to consider the advantages of the prior forming method and the prior forming equipment, the invention provides a magnetic field pressure forming and isostatic pressing integrated machine. The integrated machine creatively integrates an isostatic pressing structure on the existing magnetic field press, and the use process of the integrated machine maintains reasonable procedures of magnetic field pressure forming and isostatic pressing in the existing forming method so as to avoid deformation of magnetic blanks; meanwhile, through equipment integration, automation is convenient to realize.
The invention is realized by adopting the following technical scheme: the magnetic field pressure forming and isostatic pressing integrated machine comprises a die with upper and lower openings, an upper punch, a lower punch and an orientation magnetic field device (electromagnet); the inner wall of the die is sleeved with a rubber inner die with upper and lower openings, the upper die punch and the lower die punch extend into the rubber inner die, and magnetic field pressure forming is carried out on powder added into the rubber inner die; the inner wall of the die is provided with an annular groove, the annular groove is filled with a liquid-filled pressurizing bag (namely, the liquid-filled pressurizing bag is also annular and distributed around the groove), and the liquid-filled pressurizing bag is provided with a liquid injection nozzle which extends out of the die. After finishing magnetic field pressure forming of the powder in the rubber internal mold, injecting a pressure medium into the liquid-filled pressurizing sac through the liquid injection nozzle, and applying isostatic pressure generated by the liquid-filled pressurizing sac to a magnetic blank after magnetic field pressure forming through the rubber internal mold; the magnet blank after isostatic pressing can be directly sintered to obtain the rare earth permanent magnet.
Another technical scheme of the invention is as follows: the magnetic field pressure forming and isostatic pressing integrated machine comprises a die with upper and lower openings, an upper punch, a lower punch and an orientation magnetic field device (electromagnet); a rubber internal mold with upper and lower openings is arranged in a mold cavity of the mold, and an upper punch and a lower punch extend into the rubber internal mold to perform magnetic field pressure molding on powder added into the rubber internal mold; the upper end and the lower end of the rubber internal mold are in sealing connection with the inner wall of the mold, so that the outer wall of the rubber internal mold and the inner wall of the mold enclose a closed hydraulic medium cavity, and the mold is provided with a liquid injection hole communicated with the hydraulic medium cavity. After finishing magnetic field pressure forming of the powder in the rubber internal mold, injecting pressure medium into the hydraulic medium cavity through the liquid injection hole, and carrying out isostatic pressing on the magnetic blank after magnetic field pressure forming; the magnet blank after isostatic pressing can be directly sintered to obtain the rare earth permanent magnet.
The invention creatively integrates the isostatic pressing structure on the existing magnetic field press, and the use process of the isostatic pressing structure maintains the reasonable procedures of magnetic field pressure forming and isostatic pressing of the existing forming method, thereby avoiding the deformation of the magnetic blank; meanwhile, through equipment integration, manual operations such as plastic film packaging and plastic sealing film disassembly are omitted, automation is convenient to realize, and investment and maintenance are reduced.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a magnetic field pressure forming and isostatic pressing integrated machine according to the present invention;
fig. 2 is a partial enlarged view of fig. 1.
In the figure: 1-mould, 2-upper punch, 3-lower punch, 4-rubber internal mould, 5-liquid-filled pressurizing sac and 6-liquid injection nozzle.
Detailed Description
Example 1
The magnetic field pressure forming and isostatic pressing integrated machine comprises a die 1 with upper and lower openings, an upper punch 2, a lower punch 3 and an orientation magnetic field device (electromagnet); the inner wall of the die 1 is sleeved with a rubber inner die 4 with an upper opening and a lower opening, the upper die punch 2 and the lower die punch 3 extend into the rubber inner die 4, and powder added into the rubber inner die 4 is subjected to magnetic field pressure forming; the inner wall of the die 1 is provided with an annular groove, the annular groove is filled with a liquid filling pressurizing sac 5 (namely, the liquid filling pressurizing sac is also annular and distributed around the groove), the liquid filling pressurizing sac 5 is provided with a liquid filling nozzle 6, and the liquid filling nozzle 6 extends out of the die 1. After finishing magnetic field pressure forming of the powder in the rubber internal mold 4, injecting a pressure medium into the liquid filling pressurizing bag 5 through the liquid injection nozzle 6, and applying isostatic pressure generated by the liquid filling pressurizing bag 5 to a magnetic blank after magnetic field pressure forming through the rubber internal mold; the magnet blank after isostatic pressing can be directly sintered to obtain the rare earth permanent magnet. The axial height of the annular groove is not smaller than the height of the magnetic blank after the magnetic field pressure forming is completed in the rubber internal mold 4, so that the full isostatic pressing process of the magnetic blank is ensured. The rubber internal mold 4 can be made of polyurethane, polyethylene and polytetrafluoroethylene, and is preferably made of polyurethane with the hardness of 60-90 degrees (equivalent hardness is kept, so that the rubber internal mold can transmit isostatic pressure and does not deform in the magnetic field pressure forming process). The fluid-filled pressurized bladder 5 is formed of rubber, such as polyurethane. As shown in the figure, the present embodiment adopts vertical piezomagnetic field press molding (the pressure direction is parallel to the orientation magnetic field direction, which is called parallel piezomagnetic field press molding; the pressure direction is perpendicular to the orientation magnetic field direction, which is called vertical piezomagnetic field press molding). As known to those skilled in the art: in the isostatic pressing process, the pressure applied by the upper punch 2 and the lower punch 3 to the magnetic blank is the same as the isostatic pressure applied by the liquid-filled pressurizing sac 5 to the magnetic blank; the upper punch 2 and the lower punch 3 are driven by an upper cylinder and a lower cylinder respectively (in the existing magnetic field press), and the pressure applied by the upper punch 2 and the lower punch 3 to the magnetic blank is the same as the isostatic pressure applied by the liquid-filled pressurizing sac 5 to the magnetic blank through hydraulic control, which is very easy to realize by a person skilled in the art of hydraulic control or is a conventional technology.
Examples: cavity dimensions of mold 1: 180mm high, 100mm free, 60mm oriented. 1400g of powder is added, exciting current 140A is applied to form a magnetic field of 1.8T, the pressure of magnetic field pressure forming is 3.6MPa, and the density of a magnetic blank formed by magnetic field pressure forming is 3.3 g/Cm. Injecting 80MPa oil into the liquid-filled pressurizing bag 5 through the liquid injection nozzle 6, maintaining the pressure for 10 seconds, demagnetizing and demolding to obtain a green body with the density of 4.3g/cm, and directly sintering according to a conventional process to obtain the rare earth permanent magnet with the density of 7.5g/cm, the coercive force of 2.1 Wan Oe and the magnetic energy product of 45 MGOe. Compared with the conventional secondary molding method, the density of the product is 7.52g/cm, the coercivity is 2.1 kiloOersted, and the magnetic energy product is 43.7MGOe. The density and the coercive force are equivalent, and the magnetic energy product is improved.
Example two
The magnetic field pressure forming and isostatic pressing integrated machine comprises a die 1 with upper and lower openings, an upper punch 2, a lower punch 3 and an orientation magnetic field device (electromagnet); a rubber inner die 4 with an upper opening and a lower opening is arranged in a die cavity of the die 1, the upper die punch 2 and the lower die punch 3 extend into the rubber inner die 4, and powder added into the rubber inner die 4 is subjected to magnetic field pressure forming; the upper end and the lower end of the rubber internal mold 4 are in sealing connection with the inner wall of the mold 1, so that the outer wall of the rubber internal mold 4 and the inner wall of the mold 1 enclose a closed hydraulic medium cavity, and the mold 1 is provided with a liquid injection hole communicated with the hydraulic medium cavity. After finishing magnetic field pressure forming of the powder in the rubber internal mold 4, injecting pressure medium into the hydraulic medium cavity through the liquid injection hole, and carrying out isostatic pressing on the magnetic blank after magnetic field pressure forming; the magnet blank after isostatic pressing can be directly sintered to obtain the rare earth permanent magnet. As known to those skilled in the art: in the isostatic pressing process, the pressure applied by the upper punch 2 and the lower punch 3 to the magnetic blank is the same as the isostatic pressure; the upper punch 2 and the lower punch 3 are respectively driven by an upper oil cylinder and a lower oil cylinder, and the pressure applied by the upper punch 2 and the lower punch 3 to the magnetic blank is the same as the isostatic pressure through hydraulic control, which is very easy to realize by a person skilled in the art of hydraulic control or is a conventional technology. The sealing connection structure between the upper and lower ends of the rubber internal mold 4 and the inner wall of the mold 1 is adopted on the existing magnetic field isostatic press, so that the sealing connection structure is known or conventional by the person skilled in the art, and at least the relevant sealing connection structure related to the China patent of CN 201510921296.5 can be adopted.
Claims (6)
1. A magnetic field pressure forming and isostatic pressing integrated machine comprises a die (1) with upper and lower openings, an upper punch (2) and a lower punch (3), and an orientation magnetic field device; the method is characterized in that the inner wall of a die (1) is sleeved with a rubber inner die (4) with an upper opening and a lower opening, an upper die punch (2) and a lower die punch (3) extend into the rubber inner die (4), and powder added into the rubber inner die (4) is subjected to magnetic field pressure forming; an annular groove is formed in the inner wall of the die (1), a liquid filling pressurizing sac (5) is filled in the annular groove, a liquid filling nozzle (6) is arranged on the liquid filling pressurizing sac (5), the liquid filling nozzle (6) extends out of the die (1), after powder completes magnetic field pressure forming in the rubber internal die (4), pressure medium is injected into the liquid filling pressurizing sac (5) through the liquid filling nozzle (6), and isostatic pressure generated by the liquid filling pressurizing sac (5) is applied to a magnetic blank after magnetic field pressure forming through the rubber internal die; the hardness of the rubber internal mold (4) ensures that the rubber internal mold (4) can transmit isostatic pressure and does not deform in the magnetic field pressure forming process.
2. The magnetic field pressure forming and isostatic pressing integrated machine according to claim 1, wherein the axial height of the annular groove is not smaller than the height of the magnetic blank after finishing magnetic field pressure forming in the rubber inner die (4).
3. The magnetic field pressure forming and isostatic pressing integrated machine according to claim 1 or 2, characterized in that the rubber inner mold (4) is made of polyurethane, polyethylene and polytetrafluoroethylene, preferably polyurethane with a hardness of 60-90 degrees.
4. The magnetic field pressure forming and isostatic pressing integrated machine according to claim 1 or 2, wherein the liquid-filled pressurizing sac (5) is made of rubber, such as polyurethane.
5. A magnetic field pressure forming and isostatic pressing integrated machine as claimed in claim 3, wherein the liquid-filled pressurizing sac (5) is made of rubber, such as polyurethane.
6. A magnetic field pressure forming and isostatic pressing integrated machine comprises a die (1) with upper and lower openings, an upper punch (2) and a lower punch (3), and an orientation magnetic field device; the method is characterized in that a rubber internal mold (4) with an upper opening and a lower opening is arranged in a mold cavity of a mold (1), an upper punch (2) and a lower punch (3) extend into the rubber internal mold (4), and powder added into the rubber internal mold (4) is subjected to magnetic field pressure molding; the upper end and the lower end of the rubber internal mold (4) are connected with the inner wall of the mold (1) in a sealing way, so that the outer wall of the rubber internal mold (4) and the inner wall of the mold (1) are enclosed into a sealed hydraulic medium cavity, a liquid injection hole communicated with the hydraulic medium cavity is formed in the mold (1), after the powder completes magnetic field pressure molding in the rubber internal mold (4), a pressure medium is injected into the hydraulic medium cavity through the liquid injection hole, and isostatic pressure generated by the pressure medium is applied to a magnetic blank after the magnetic field pressure molding through the rubber internal mold (4); the hardness of the rubber internal mold (4) ensures that the rubber internal mold (4) can transmit isostatic pressure and does not deform in the magnetic field pressure forming process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211087490.4A CN115283676B (en) | 2022-09-07 | 2022-09-07 | Magnetic field pressure forming and isostatic pressing integrated machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211087490.4A CN115283676B (en) | 2022-09-07 | 2022-09-07 | Magnetic field pressure forming and isostatic pressing integrated machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115283676A CN115283676A (en) | 2022-11-04 |
| CN115283676B true CN115283676B (en) | 2023-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211087490.4A Active CN115283676B (en) | 2022-09-07 | 2022-09-07 | Magnetic field pressure forming and isostatic pressing integrated machine |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07130566A (en) * | 1993-11-05 | 1995-05-19 | Inter Metallics Kk | Method of compression-molding permanent magnet powder |
| JP2000033609A (en) * | 1998-07-15 | 2000-02-02 | Kobe Steel Ltd | Platelike or blocking product-molding device |
| CN106024366A (en) * | 2016-06-21 | 2016-10-12 | 董开 | Primary molding magnetic field molding method and device |
| CN106057462A (en) * | 2016-07-13 | 2016-10-26 | 太原盛开源永磁设备有限公司 | Shifting magnetic field type method and device for pressing radiant orientation circular ring |
| CN110534332A (en) * | 2019-09-29 | 2019-12-03 | 太原开元智能装备有限公司 | Sintered magnet preparation method and its pressure forming machine |
| CN111112605A (en) * | 2020-02-29 | 2020-05-08 | 江西开源自动化设备有限公司 | Powder magnetic field forming method of rare earth permanent magnet |
-
2022
- 2022-09-07 CN CN202211087490.4A patent/CN115283676B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07130566A (en) * | 1993-11-05 | 1995-05-19 | Inter Metallics Kk | Method of compression-molding permanent magnet powder |
| JP2000033609A (en) * | 1998-07-15 | 2000-02-02 | Kobe Steel Ltd | Platelike or blocking product-molding device |
| CN106024366A (en) * | 2016-06-21 | 2016-10-12 | 董开 | Primary molding magnetic field molding method and device |
| CN106057462A (en) * | 2016-07-13 | 2016-10-26 | 太原盛开源永磁设备有限公司 | Shifting magnetic field type method and device for pressing radiant orientation circular ring |
| CN110534332A (en) * | 2019-09-29 | 2019-12-03 | 太原开元智能装备有限公司 | Sintered magnet preparation method and its pressure forming machine |
| CN111112605A (en) * | 2020-02-29 | 2020-05-08 | 江西开源自动化设备有限公司 | Powder magnetic field forming method of rare earth permanent magnet |
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| Publication number | Publication date |
|---|---|
| CN115283676A (en) | 2022-11-04 |
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