Technology and device for forming dry bag quick isostatic pressing in oriented magnetic fields
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A technology of oriented magnetic field and forming technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of large consumption of soft mold bags, reduced green compact density, uneven density, etc., to save resources and man-hours The effect of cost, product qualification rate improvement, and uniform distribution of internal stress
Inactive Publication Date: 2014-06-25
吴庆华 +2
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Problems solved by technology
In the past 28 years, many new technologies, new processes and equipment have appeared in various processes, but the powder molding process has always been the bottleneck in the development of NdFeB permanent magnets (strontium-containing ferrite, cobalt permanent magnets, etc.)
But its biggest disadvantages are: 1. Cannot complete isostatic pressing in orientation magnetic field; 2. Oil is easy to contaminate the green compact; 3. The consumption of soft mold bags is large and the operation is cumbersome
In recent years, the high-density and high-quality forming technology and equipment of large-scale products under the orientation magnetic field have become a research hotspot that countries around the world are paying close attention to. Uniform and extremely uneven internal stress; 2. The relative density of the compact is further reduced; 3. The magnetic orientation effect (orientation degree) is significantly reduced; 4. Complex shapes cannot be formed or the mold structure is complex, and the cost is high; 5. Powder parison Can not be machined; 6. Raw materials (primary powder) cannot be recycled
In the end, the magnetic properties of the product will be significantly reduced, and the production efficiency will be extremely low.
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Embodiment 1
[0026] Prepare a tile-shaped NdFeB sintered magnet, the properties:
[0027] The magnetic energy product is (BH)max / 40(MG.Oe); the alloy density is 7.6g / cm 3 ;The size of the tile-shaped product is: (length) 40mm×(width) 20mm×(thickness) 8mm, and the inner arc surface is R50mm. Polishing after sintering is required.
[0028] The relevant soft mold design and preparation methods are as follows:
[0029] 1. Dry bag type rapid cold isostatic pressing mold design
[0030] Mold structure and attached figure 2 It is exactly the same, but the size of each part of the mold should start from the compact size design and related calculations.
[0031] 1.1. Compact design
[0032] 1.1.1. Determination of the size of the sintered body
[0033] Final size of sintered body: length L 1 =40mm, width b 1 =20mm, thickness H 1 =8mm, inner arc surface R 内1 =50mm, outer arc surface R 外1 = 58mm.
[0080] Preparation of medium-sized tile-shaped NdFeB sintered magnets, various properties:
[0081] The magnetic energy product is (BH)max / 40(MG.Oe); the alloy density is 7.6g / cm 3 ;The size of the medium-sized tile-shaped product is: (length) 80mm×(width) 40mm×(thickness) 16mm, and the inner arc surface is R100mm. Polishing after sintering is required.
[0082] The relevant soft mold design and preparation methods are as follows:
[0083] 2.1 Dry bag type rapid cold isostatic pressing die design
[0084] Mold structure and attached figure 2 It is exactly the same, but the size of each part of the mold should start from the compact size design and related calculations.
[0085] 2.1. Compact design
[0086] 2.1.1. Determination of the size of the sintered body
[0087] Final size of sintered body: length L 1 =80mm, width b 1 =40mm, thickness H 1 =16mm, inner arc surface R 内1 =100mm, outer arc surface R 外1 =116mm.
[0088] 2.1.2. Compact size calculation
[0089] K...
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Abstract
The invention belongs to the field of technologies for manufacturing magnetic materials, and provides a technology and a device for forming dry bag quick isostatic pressing in oriented magnetic fields. The technology and the device have the advantages that an oriented magnetic field technology is ingeniously and organically combined with the technology and the device for forming dry bag isostatic pressing by the aid of a novel design concept, so that dry bag isostatic pressing can be formed in the oriented magnetic fields which have optional directions and optional magnetic field intensities by the aid of the novel technology and the novel device; orientation degrees of products can be obviously upgraded; two necessary working procedures in existing neodymium, iron and boron magnet production can be combined with each other to form one working procedure by the novel technology and the novel device, and the automation and mechanization levels are high; powder is not in contact with pressing blanks and oil in production procedures, and accordingly a latex sheath for binding the corresponding pressing blank can be omitted; the pressing blanks are quite uniform in density distribution and internal stress distribution; the pressing blanks can be machined, and original powder can be recycled; single-hole and multi-hole thin-walled pipes, sleeves and multi-magnetic-pole products which are heavy and are in complicated shapes or have large length-diameter (L/d) ratios can be produced by the aid of the technology and the device, the rare earth mineral resource utilization rate can be greatly increased, and the neodymium, iron and boron magnet industrial production level of China can be upgraded to the world leading level.
Description
technical field [0001] The invention belongs to the technical field of magnetic material preparation and provides a dry-bag rapid isostatic pressing forming method under an orientation magnetic field. Background technique [0002] Since the sintered NdFeB permanent magnet material came out in 1984 (invented by Sogawa et al.), because of its excellent magnetic properties (high magnetic energy product), it has been widely used in generators, motors, and speakers in just 28 years. , Magnetic bearings and other aspects have been greatly applied. These products are widely used in aerospace, flight equipment, electric vehicles, automotive micro-movement parts, medical equipment and other fields. In recent years, with the development of large-scale equipment such as wind power, hydropower and tidal power, the demand for large-scale NdFeB permanent magnet products has become more and more urgent. Therefore, industrially developed countries in the world have invested a lot of manpo...
Claims
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