US20090246063A1 - Method and apparatus for producing radially oriented ring magnet - Google Patents
Method and apparatus for producing radially oriented ring magnet Download PDFInfo
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- US20090246063A1 US20090246063A1 US12/378,230 US37823009A US2009246063A1 US 20090246063 A1 US20090246063 A1 US 20090246063A1 US 37823009 A US37823009 A US 37823009A US 2009246063 A1 US2009246063 A1 US 2009246063A1
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- magnetic field
- oriented
- mold cavity
- outer pole
- magnetic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0273—Imparting anisotropy
- H01F41/028—Radial anisotropy
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- 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
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- 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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F5/106—Tube or ring forms
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- 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
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Definitions
- the present invention relates to a method and an apparatus for producing radially oriented ring magnet, and more particularly for the orientation along the radius or diameter of the ring magnet.
- Radially oriented ring magnet also called radial ring or radially oriented ring
- the biggest technical difficulty of fabricating the radial ring is to apply radial orienting to the powder body during the forming stage.
- the first is the sectional orienting method which separates the ring into several sections, and introduces each section into the magnet field individually.
- the disadvantage of this method is that the orientation is not uniform, some portion is higher, and some portion is lower.
- the second is the squeezed magnetic field orienting method, the method is to adjust the current direction of the two coils to generate a same pole (N pole or S pole) magnetic field between the terminals of the two coils, then to squeeze the same pole magnetic field into the inner cavity of the radial ring mold and to form a radial magnetic field through a magnetic conductive device.
- the disadvantage is when the inner diameter is small, the oriented magnetic field strength will reduce largely and will cause the magnetic powder orienting insufficiently (the first method has the same problem).
- the oriented magnetic field strength will reduce and the uniformity will be affected as well, this will fail the request of performance and uniformity.
- the present invention provides a method and an apparatus for producing radially oriented ring magnet.
- the problem it solved is to uniformly orient the magnet powder in the process of producing, and also to get relatively large oriented magnetic field strength even if the inner diameter of the magnet ring is too small, or the height of the magnetic ring is too high, so as to increase the performance and uniformity of the radial ring.
- the present invention provides the following method: a method of forming a radially oriented ring magnet, is to position magnetic powder into a ring mold, using an oriented magnetic field to orient the magnetic powder in the ring mold along the radius or diameter direction, wherein the oriented magnetic field is distributed discretely 360° around the ring mold, and during the forming process the oriented magnetic field and the magnetic powder have relative rotation.
- a method of forming a radially oriented ring magnet comprises the steps of:
- An apparatus for forming radially oriented ring magnet comprises a ring mold cavity positioned in an oriented magnetic field, wherein the oriented magnetic field is distributed discretely 360° around the ring mold, and the apparatus comprises a component fot the oriented magnetic field and the magnetic powder to rotate relatively.
- the oriented magnetic field of the present invention is a flake parallel magnetic field or near parallel magnetic field.
- the width of the oriented magnetic field of the present invention along the diameter of the radial ring mold cavity is less than the inner diameter of the mold cavity.
- the width of the oriented magnetic field of the present invention along the diameter of the radial ring mold cavity is less than the one fifth of the inner diameter of the mold cavity.
- the inner pole of the oriented magnetic field is located in the center of the ring mold cavity, and the outer pole of the oriented magnetic field is located on the outside of the ring mold cavity.
- the magnetic conductive plate is located inside the outer pole to form a strong magnetic field between the inner pole and the magnetic conductive plate.
- the present invention comprises more than one set of inner pole and magnetic conductive plate.
- the mold cavity and the inner pole of the oriented magnetic field is fixed, the outer pole and the magnetic conductive plate of the oriented magnetic field are connected with the rotation driver; or the outer pole and the magnetic conductive plate are fixed, the mold cavity and the inner pole are connected with the rotation driver.
- the first outer pole and the second outer pole of the oriented magnetic field of the present invention are positioned at the outside of the ring mold cavity facing to each other.
- a magnetic conductive core is located at the center of the ring mold cavity. The magnetic conductive core forms two strong magnetic fields respectively between the magnetic conductive core and the first outer pole, and between the magnetic conductive core and the second outer pole.
- the mold cavity and the magnetic conductive core are fixed, the first outer pole and the second outer pole of the oriented magnetic field are connected with the rotation driver; or the first outer pole and the second outer pole are fixed, the mold cavity and the magnetic conductive core are connected with the rotation driver.
- the first pole and the second pole have more than one pair.
- the number of the first pole and the second pole is odd.
- the oriented magnetic field is distributed discretely 360° around the ring magnet, and during the forming process the oriented magnetic field and the magnetic powder have relative rotation. Because the magnetic field is the same field in 360°, the orienting of the magnetic powder is more complete, the orientation in different directions is more unified.
- This invention can be used in producing sintering radial ring magnet, adhesion radial ring magnet, and injection radial ring magnet.
- FIG. 1 is a perspective view of one embodiment of the present invention illustrating the inner pole—outer pole (1) orientation method.
- FIG. 2 is a perspective view of one embodiment of the present invention illustrating the inner pole—outer pole (2) orientation method.
- FIG. 3 is a perspective view of one embodiment of the present invention illustrating the outer pole—outer pole orientation method.
- the numbers indicate: 1 . inner pole (can also acts a mold core if the hardness of the magnetic conductive material is large); 2 . mold cavity; 3 . nonmagnetic mold; 4 . magnetic conductive plate; 5 . outer pole; 6 . magnetic field; 7 . the first outer pole; 8 . the second outer pole; 9 . magnetic conductive core (can also acts a mold core if the hardness of the magnetic conductive material is large).
- the selected oriented magnetic field is not distributed all around the mold cavity in 360°, but is limited in a portion of the mold cavity.
- the width in the diameter direction of the mold cavity is less than the inner diameter of the mold cavity, the optimum width is the one fifth of the inner diameter of the mold cavity.
- the 360° orientation of the magnetic powder is realized by continuously rotating the mold cavity and the magnetic powder inside the mold cavity relating to the oriented magnetic field for plural of rounds, instead of applying a 360° or near 360° radial oriented magnetic field as the conventional method.
- the oriented magnetic field is using flake parallel magnetic field or near flake parallel magnetic field instead of the ring radial magnetic field.
- the parallel magnetic field is a well developed technique which is easy to realizand can provide strong magnetic field. On the contrary, it is difficult for a ring magnetic field to provide a strong magnetic field.
- the present invention is using a mature technique to achieve the effect which needs non- mature technique to achieve.
- the present invention has two preferred embodiment to realize: (1) the inner pole—outer pole method; and (2) the outer pole—outer pole method.
- a strong magnetic field 6 will be formed between the inner pole 1 and the magnetic conductive plate 4 in the inside of the outer pole 5 . If the mold cavity 2 is filled with magnetic powder, the magnetic powder in the magnetic field 6 will be sufficiently magnetized and oriented. If the first method is used, the nonmagnetic mold 3 , mold cavity 2 , and inner pole 1 are fixed on the platform of the apparatus and are relatively static. The outer pole 5 and magnetic conductive plate 4 are connected with the rotation driver to rotate around the nonmagnetic mold 3 , mold cavity 2 , and inner pole 1 .
- outer pole 5 and magnetic conductive plate 4 are fixed on the platform of the apparatus and are relatively static, nonmagnetic mold 3 , mold cavity 2 , and inner pole 1 are connected with the rotation driver to rotate to magnetize and radially orient all the magnetic powder in the mold cavity 2 .
- using the existing method of pressure forming applying a gradually increased pressure will realized the radial ring bodyware pressure forming.
- a reverse magnetic field which has an opposite direction against the oriented magnetic field 6 , and proper magnetic field strength, is needed to be introduced between the inner pole 1 and the outer pole 5 to demagnetize the bodyware.
- the present invention only uses one set of outer pole 5 and magnetic conductive plate 4 . It is optional to use more than one set. Additionally, the magnetic field introduced between the inner pole I and the outer pole 5 could be a permanent magnetic field, or a regularly changed magnetic field (such as pulse magnetic field), and also could be a irregularly changed magnetic field.
- a strong magnetic field 6 will be formed between the inner pole 1 and the magnetic conductive plate 4 in the inside of the outer pole 5 . If the mold cavity 2 is filled with magnetic powder, the magnetic powder in the magnetic field 6 will be sufficiently magnetized and oriented. If the first method is used, the nonmagnetic mold 3 , mold cavity 2 , and inner pole 1 are fixed on the platform of the apparatus and are relatively static. The magnetic conductive plate 4 is fixed on the on the outer pole 5 , and the outer pole 5 is driven by a motor to rotate in high speed.
- the outer pole 5 and the magnetic conductive plate 4 are fixed on the platform of the apparatus and are relatively static.
- the nonmagnetic mold 3 , mold cavity 2 , and inner pole 1 are connected with the rotation driver to rotate to magnetize and radially orient all the magnetic powder in the mold 5 cavity 2 .
- using the existing method of pressure forming applying a gradually increased pressure will realized the radial ring bodyware pressure forming.
- a reverse magnetic field which has an opposite direction against the oriented magnetic field 6 , and proper magnetic field strength, is needed to be introduced between the inner pole 1 and the outer pole 5 to demagnetize the bodyware.
- the invention only uses one magnetic conductive plate 4 . It is optional to use more than one magnetic conductive plate 4 . Additionally, the magnetic field introduced between the inner pole 1 and the outer pole 5 could be a permanent magnetic field, or a regularly changed magnetic field (such as pulse magnetic field), and also could be a irregularly changed magnetic field.
- the first outer pole 7 and the second outer pole 8 are connected with the rotation driver to rotate around the nonmagnetic mold 3 , mold cavity 2 , and magnetic conductive core 9 .
- the first outer pole 7 and the second outer pole 8 are fixed on the platform of the apparatus and are relatively static, nonmagnetic mold 3 , mold cavity 2 , and magnetic conductive core 9 are connected with the rotation driver to rotate to magnetize and radially orient all the magnetic powder in the mold cavity 2 .
- using the existing method of pressure forming applying a gradually increased pressure will realized the radial ring bodyware pressure forming.
- first outer pole 7 and the second outer pole 8 uses one pair of outer poles (first outer pole 7 and the second outer pole 8 ). It is optional to use more than one pair of outer poles, or odd-numbered outer poles, for example, 3 outer poles, one N and two S.
- the magnetic field introduced between the first outer pole 7 and the second outer pole 8 could be a permanent magnetic field, or a regularly changed magnetic field (such as pulse magnetic field), and also could be a irregularly changed magnetic field.
- the present invention uses the method which is rotating and applying pressure at the same time to form the radial ring bodyware by pressure.
- the radial ring bodyware can also be formed using the steps of:
- the method and apparatus of the present invention can be used in producing sintering radial ring magnet, adhesion radial ring magnet, and injection radial ring magnet.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Powder Metallurgy (AREA)
Abstract
The present invention provides a method and an apparatus for producing radially oriented ring magnet. The problem it solved is to uniformly orient the magnet powder in the process of producing, and also to get relatively large oriented magnetic field strength, so as to increase the performance and uniformity of the radial ring. The method of forming a radially oriented ring magnet, is to position magnetic powder into a ring mold, using an oriented magnetic field to orient the magnetic powder in the ring mold along the radius or diameter direction, wherein the oriented magnetic field is distributed discretely 360° around the ring mold, and during the forming process the oriented magnetic field and the magnetic powder have relative rotation. The apparatus comprises a ring mold cavity positioned in an oriented magnetic field, wherein the oriented magnetic field is distributed discretely 360° around the ring mold, and the apparatus comprises a component fot the oriented magnetic field and the magnetic powder to rotate relatively. Because the magnetic field is the same field in 360°, the orienting of the magnetic powder is more complete, the orientation in different directions is more unified.
Description
- 1. Field of Invention
- The present invention relates to a method and an apparatus for producing radially oriented ring magnet, and more particularly for the orientation along the radius or diameter of the ring magnet.
- 2. Description of Related Arts
- Radially oriented ring magnet (also called radial ring or radially oriented ring) is widely used in the electric field. The biggest technical difficulty of fabricating the radial ring is to apply radial orienting to the powder body during the forming stage. Currently there are two major methods of orienting in this industry: the first is the sectional orienting method which separates the ring into several sections, and introduces each section into the magnet field individually. The disadvantage of this method is that the orientation is not uniform, some portion is higher, and some portion is lower. Not uniformed orientation would not only seriously affect the overall magnetic property of the magnet ring, but due to different level of orientation has different shrinkage in the sintering process and (or) heating treatment, it will lead to radial ring cracking or deformation, so as to reduce the performance, lower the production yield, and increase the cost. The second is the squeezed magnetic field orienting method, the method is to adjust the current direction of the two coils to generate a same pole (N pole or S pole) magnetic field between the terminals of the two coils, then to squeeze the same pole magnetic field into the inner cavity of the radial ring mold and to form a radial magnetic field through a magnetic conductive device. The disadvantage is when the inner diameter is small, the oriented magnetic field strength will reduce largely and will cause the magnetic powder orienting insufficiently (the first method has the same problem). In addition, when the height of the radial ring is high, the oriented magnetic field strength will reduce and the uniformity will be affected as well, this will fail the request of performance and uniformity.
- The present invention provides a method and an apparatus for producing radially oriented ring magnet. The problem it solved is to uniformly orient the magnet powder in the process of producing, and also to get relatively large oriented magnetic field strength even if the inner diameter of the magnet ring is too small, or the height of the magnetic ring is too high, so as to increase the performance and uniformity of the radial ring.
- The present invention provides the following method: a method of forming a radially oriented ring magnet, is to position magnetic powder into a ring mold, using an oriented magnetic field to orient the magnetic powder in the ring mold along the radius or diameter direction, wherein the oriented magnetic field is distributed discretely 360° around the ring mold, and during the forming process the oriented magnetic field and the magnetic powder have relative rotation.
- A method of forming a radially oriented ring magnet, comprises the steps of:
- (a) applying a relatively small pressure onto the magnetic powder in the cavity of the mold to reduce the volume of the magnetic powder to 5% to 40%;
- (b) introducing magnetic field to the pole of the oriented magnetic field, rotating the magnetic powder in the mold relating to the oriented magnetic field until the magnetic powder is totally magnetized;
- (c) reducing the magnetic field strength of the oriented magnetic field until zero during rotating;
- (d) applying more pressure on the magnetic powder until predetermined level; and
- (e) applying reverse magnetic field to the radial ring bodyware for demagnetization, receiving radial ring bodyware.
- An apparatus for forming radially oriented ring magnet comprises a ring mold cavity positioned in an oriented magnetic field, wherein the oriented magnetic field is distributed discretely 360° around the ring mold, and the apparatus comprises a component fot the oriented magnetic field and the magnetic powder to rotate relatively.
- The oriented magnetic field of the present invention is a flake parallel magnetic field or near parallel magnetic field.
- The width of the oriented magnetic field of the present invention along the diameter of the radial ring mold cavity is less than the inner diameter of the mold cavity.
- The width of the oriented magnetic field of the present invention along the diameter of the radial ring mold cavity is less than the one fifth of the inner diameter of the mold cavity.
- The inner pole of the oriented magnetic field is located in the center of the ring mold cavity, and the outer pole of the oriented magnetic field is located on the outside of the ring mold cavity. The magnetic conductive plate is located inside the outer pole to form a strong magnetic field between the inner pole and the magnetic conductive plate.
- The present invention comprises more than one set of inner pole and magnetic conductive plate.
- In the presenting invention, the mold cavity and the inner pole of the oriented magnetic field is fixed, the outer pole and the magnetic conductive plate of the oriented magnetic field are connected with the rotation driver; or the outer pole and the magnetic conductive plate are fixed, the mold cavity and the inner pole are connected with the rotation driver.
- The first outer pole and the second outer pole of the oriented magnetic field of the present invention are positioned at the outside of the ring mold cavity facing to each other. A magnetic conductive core is located at the center of the ring mold cavity. The magnetic conductive core forms two strong magnetic fields respectively between the magnetic conductive core and the first outer pole, and between the magnetic conductive core and the second outer pole.
- The mold cavity and the magnetic conductive core are fixed, the first outer pole and the second outer pole of the oriented magnetic field are connected with the rotation driver; or the first outer pole and the second outer pole are fixed, the mold cavity and the magnetic conductive core are connected with the rotation driver.
- In the present invention, the first pole and the second pole have more than one pair.
- In the present invention, the number of the first pole and the second pole is odd.
- Comparing with the conventional technique, in the present invention, the oriented magnetic field is distributed discretely 360° around the ring magnet, and during the forming process the oriented magnetic field and the magnetic powder have relative rotation. Because the magnetic field is the same field in 360°, the orienting of the magnetic powder is more complete, the orientation in different directions is more unified. This invention can be used in producing sintering radial ring magnet, adhesion radial ring magnet, and injection radial ring magnet.
- 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.
-
FIG. 1 is a perspective view of one embodiment of the present invention illustrating the inner pole—outer pole (1) orientation method. -
FIG. 2 is a perspective view of one embodiment of the present invention illustrating the inner pole—outer pole (2) orientation method. -
FIG. 3 is a perspective view of one embodiment of the present invention illustrating the outer pole—outer pole orientation method. - Referring to the drawings of the present invention, the numbers indicate: 1. inner pole (can also acts a mold core if the hardness of the magnetic conductive material is large); 2. mold cavity; 3. nonmagnetic mold; 4. magnetic conductive plate; 5. outer pole; 6. magnetic field; 7. the first outer pole; 8. the second outer pole; 9. magnetic conductive core (can also acts a mold core if the hardness of the magnetic conductive material is large).
- In the method of forming radial oriented ring magnet of the present invention, the selected oriented magnetic field is not distributed all around the mold cavity in 360°, but is limited in a portion of the mold cavity. The width in the diameter direction of the mold cavity is less than the inner diameter of the mold cavity, the optimum width is the one fifth of the inner diameter of the mold cavity. The 360° orientation of the magnetic powder is realized by continuously rotating the mold cavity and the magnetic powder inside the mold cavity relating to the oriented magnetic field for plural of rounds, instead of applying a 360° or near 360° radial oriented magnetic field as the conventional method. The oriented magnetic field is using flake parallel magnetic field or near flake parallel magnetic field instead of the ring radial magnetic field. The parallel magnetic field is a well developed technique which is easy to realizand can provide strong magnetic field. On the contrary, it is difficult for a ring magnetic field to provide a strong magnetic field. The present invention is using a mature technique to achieve the effect which needs non- mature technique to achieve.
- The present invention has two preferred embodiment to realize: (1) the inner pole—outer pole method; and (2) the outer pole—outer pole method.
- Referring to
FIG. 1 , after introducing the two poles (N and S) of a magnetic field generated by an electromagnet or a permanent magnet into theinner pole 1 and theouter pole 5 though a magnetic conductive component respectively, a strongmagnetic field 6 will be formed between theinner pole 1 and the magneticconductive plate 4 in the inside of theouter pole 5. If themold cavity 2 is filled with magnetic powder, the magnetic powder in themagnetic field 6 will be sufficiently magnetized and oriented. If the first method is used, thenonmagnetic mold 3,mold cavity 2, andinner pole 1 are fixed on the platform of the apparatus and are relatively static. Theouter pole 5 and magneticconductive plate 4 are connected with the rotation driver to rotate around thenonmagnetic mold 3,mold cavity 2, andinner pole 1. If the second method is used,outer pole 5 and magneticconductive plate 4 are fixed on the platform of the apparatus and are relatively static,nonmagnetic mold 3,mold cavity 2, andinner pole 1 are connected with the rotation driver to rotate to magnetize and radially orient all the magnetic powder in themold cavity 2. At the same time of magnetization and orientation, using the existing method of pressure forming, applying a gradually increased pressure will realized the radial ring bodyware pressure forming. After the forming, a reverse magnetic field which has an opposite direction against the orientedmagnetic field 6, and proper magnetic field strength, is needed to be introduced between theinner pole 1 and theouter pole 5 to demagnetize the bodyware. Then using the widely used sintering process and (or) heating treatment to process the radial ring bodyware to get the semifinished radial ring. After the finishing machining, a radial ring is produced. In this embodiment, the present invention only uses one set ofouter pole 5 and magneticconductive plate 4. It is optional to use more than one set. Additionally, the magnetic field introduced between the inner pole I and theouter pole 5 could be a permanent magnetic field, or a regularly changed magnetic field (such as pulse magnetic field), and also could be a irregularly changed magnetic field. - Referring the
FIG. 2 , after introducing the two poles (N and S) of a magnetic field generated by an electromagnet or a permanent magnet into theinner pole 1 and theouter pole 5 though a magnetic conductive component respectively, a strongmagnetic field 6 will be formed between theinner pole 1 and the magneticconductive plate 4 in the inside of theouter pole 5. If themold cavity 2 is filled with magnetic powder, the magnetic powder in themagnetic field 6 will be sufficiently magnetized and oriented. If the first method is used, thenonmagnetic mold 3,mold cavity 2, andinner pole 1 are fixed on the platform of the apparatus and are relatively static. The magneticconductive plate 4 is fixed on the on theouter pole 5, and theouter pole 5 is driven by a motor to rotate in high speed. If the second method is used, theouter pole 5 and the magneticconductive plate 4 are fixed on the platform of the apparatus and are relatively static. Thenonmagnetic mold 3,mold cavity 2, andinner pole 1 are connected with the rotation driver to rotate to magnetize and radially orient all the magnetic powder in themold 5cavity 2. At the same time of magnetization and orientation, using the existing method of pressure forming, applying a gradually increased pressure will realized the radial ring bodyware pressure forming. After the forming, a reverse magnetic field which has an opposite direction against the orientedmagnetic field 6, and proper magnetic field strength, is needed to be introduced between theinner pole 1 and theouter pole 5 to demagnetize the bodyware. Then using the widely used sintering process and (or) heating treatment to process the radial ring bodyware to get the semifinished radial ring. After the finishing machining, a radial ring is produced. In this embodiment, the invention only uses one magneticconductive plate 4. It is optional to use more than one magneticconductive plate 4. Additionally, the magnetic field introduced between theinner pole 1 and theouter pole 5 could be a permanent magnetic field, or a regularly changed magnetic field (such as pulse magnetic field), and also could be a irregularly changed magnetic field. - Referring to
FIG. 3 , after introducing the two poles (N and S) of a magnetic field generated by an electromagnet or a permanent magnet into the firstouter pole 7 and the secondouter pole 8 though a magnetic conductive component respectively, two strongmagnetic fields 6 will be formed between the magneticconductive core 9 and the firstouter pole 7, and between the magnetic conductive core 9and the secondouter pole 8. If themold cavity 2 is filled with magnetic powder, the magnetic powder in themagnetic field 6 will be sufficiently magnetized and oriented. If the first method is used, thenonmagnetic mold 3, themold cavity 2, and magneticconductive core 9 are fixed on the platform of the apparatus and are relatively static. The firstouter pole 7 and the secondouter pole 8 are connected with the rotation driver to rotate around thenonmagnetic mold 3,mold cavity 2, and magneticconductive core 9. If the second method is used, the firstouter pole 7 and the secondouter pole 8 are fixed on the platform of the apparatus and are relatively static,nonmagnetic mold 3,mold cavity 2, and magneticconductive core 9 are connected with the rotation driver to rotate to magnetize and radially orient all the magnetic powder in themold cavity 2. At the same time of magnetization and orientation, using the existing method of pressure forming, applying a gradually increased pressure will realized the radial ring bodyware pressure forming. Then using the widely used sintering process and (or) heating treatment to process the radial ring bodyware to get the semifinished radial ring. After the finishing machining, a radial ring is produced. In this embodiment, the invention only uses one pair of outer poles (firstouter pole 7 and the second outer pole 8). It is optional to use more than one pair of outer poles, or odd-numbered outer poles, for example, 3 outer poles, one N and two S. The magnetic field introduced between the firstouter pole 7 and the secondouter pole 8 could be a permanent magnetic field, or a regularly changed magnetic field (such as pulse magnetic field), and also could be a irregularly changed magnetic field. - In the
embodiments 1 to 3, the present invention uses the method which is rotating and applying pressure at the same time to form the radial ring bodyware by pressure. Alternatively, the radial ring bodyware can also be formed using the steps of: - (a) applying a relatively small pressure onto the magnetic powder in the cavity of the mold to reduce the volume of the magnetic powder to 5% to 40%, the density of the powder is proper when the magnetic powder does not slide in the mold cavity obviously but can still rotate in the magnetic field;
- (b) introducing magnetic field to the pole of the oriented magnetic field, rotating the magnetic powder in the mold relating for a plurality of rounds to the oriented magnetic field until the magnetic powder is totally magnetized;
- (c) reducing the magnetic field strength of the oriented magnetic field until zero during rotating;
- (d) applying more pressure on the magnetic powder until predetermined level; and
- (e) applying reverse magnetic field to the radial ring bodyware for demagnetization, receiving radial ring bodyware.
- The method and apparatus of the present invention can be used in producing sintering radial ring magnet, adhesion radial ring magnet, and injection radial ring magnet.
- 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. It 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 (13)
1. A method for forming radially oriented ring magnet, comprising the steps of:
(a) positioning a magnetic powder in a ring mold cavity; and
(b) radially orienting said magnetic powder in said ring mold cavity by a oriented magnetic field along radius or diameter direction, wherein said oriented magnetic field is distributed discretely 360° around said ring mold cavity, and during said forming process said oriented magnetic field and said magnetic powder have relative rotation.
2. A method for forming radially oriented ring magnet, comprising the steps of:
(a) applying a relatively small pressure onto a magnetic powder in a mold cavity to reduce the volume of said magnetic powder to 5% to 40%;
(b) introducing a magnetic field to the poles of an oriented magnetic field, rotating said magnetic powder in said mold cavity relating to said oriented magnetic field until said magnetic powder is totally magnetized;
(c) reducing the magnetic field strength of said oriented magnetic field until zero during rotating;
(d) applying more pressure on said magnetic powder until a predetermined level; and
(e) applying a reverse magnetic field to a radial ring bodyware for demagnetization, receiving said radial ring bodyware.
3. An apparatus for forming radially oriented ring magnet, comprising a ring mold cavity in said oriented magnetic field, wherein said oriented is distributed discretely 360° around said ring mold cavity, and during said forming process said oriented magnetic field and said magnetic powder have relative rotation.
4. The apparatus, as recited in claim 3 , wherein said oriented magnetic field is a flake parallel magnetic field or a near parallel magnetic field.
5. The apparatus, as recited in claim 4 , wherein the width of said oriented magnetic field in the diameter direction is less than the inner diameter of said mold cavity.
6. The apparatus, as recited in claim 5 , wherein the width of said oriented magnetic field in the diameter direction is less than the one fifth of the inner diameter of said mold cavity.
7. The apparatus, as recited in claim 6 , wherein an inner pole of said oriented magnetic field is located in the center of said ring mold cavity, an outer pole of said oriented magnetic field is located in the outside of said ring mold cavity, wherein said apparatus comprises a magnetic conductive plate located inside said outer pole, and a strong magnetic field between said inner pole and said magnetic conductive plate.
8. The apparatus, as recited in claim 7 , wherein comprises more than one set of inner pole and magnetic conductive plate.
9. The apparatus, as recited in claim 8 , wherein said mold cavity and said inner pole of said oriented magnetic field are fixed, said outer pole of said oriented magnetic field and said magnetic conductive plate are connected with a rotation driver; or said outer pole and said magnetic conductive plate are fixed, said mold cavity and said inner pole are connected with said rotation driver.
10. The apparatus, as recited in claim 6 , wherein said first outer pole and said second outer pole of said oriented magnetic field are positioned at the outside of said ring mold cavity facing to each other, wherein said ring mold cavity further comprises a magnetic conductive core located at the center thereof, wherein said apparatus comprises two strong magnetic fields respectively between said magnetic conductive core and said first outer pole, and between said magnetic conductive core and said second outer pole.
11. The apparatus, as recited in claim 10 , wherein said mold cavity of said oriented magnetic field and said magnetic conductive core are fixed, said first outer pole and said second outer pole of said oriented magnetic field are connected with a rotation driver; or said first outer pole and said second outer pole of said oriented magnetic field are fixed, said mold cavity and said magnetic conductive core are connected with said rotation driver.
12. The apparatus, as recited in claim 11 , wherein said first outer pole and said second outer pole are more than one pair.
13. The apparatus, as recited in claim 11 , wherein said first outer pole and said second outer pole have an odd number.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2008100662694A CN101256898B (en) | 2008-03-27 | 2008-03-27 | Method and apparatus for forming of radiation orientating round ring-shaped magnetic body |
CN200810066269.4 | 2008-03-27 |
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US20090246063A1 true US20090246063A1 (en) | 2009-10-01 |
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US12/378,230 Abandoned US20090246063A1 (en) | 2008-03-27 | 2009-02-11 | Method and apparatus for producing radially oriented ring magnet |
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Cited By (1)
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CN113977856A (en) * | 2021-10-22 | 2022-01-28 | 杭州千石科技有限公司 | Electromagnetic field radiation orientation device of annular injection molding magnet |
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CN101719417B (en) * | 2009-10-19 | 2012-10-03 | 金浦威恩磁业(上海)有限公司 | Radial orienting method and device of ring-shaped anisotropic magnet |
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CN102360914B (en) * | 2011-08-10 | 2013-06-05 | 周大鹏 | Method for manufacturing annular magnet with radial magnetic orientation |
CN102360915B (en) * | 2011-08-10 | 2013-03-13 | 周大鹏 | Equipment for manufacturing magnet with radialized magnetic aligning |
CN102360697B (en) * | 2011-08-10 | 2013-05-29 | 周大鹏 | Annular magnet with radial magnetic orientation |
CN103310970B (en) * | 2012-03-09 | 2016-01-06 | 江苏东瑞磁材科技有限公司 | The preparation method of permanent-magnetic ring of radial orientation and radial orientation device thereof |
CN102543353A (en) * | 2012-03-09 | 2012-07-04 | 上海平野磁气有限公司 | Method and device for manufacturing magnetic radiation ring |
CN103123864B (en) * | 2013-02-26 | 2016-01-06 | 江苏东瑞磁材科技有限公司 | A kind of method and manufacturing installation thereof preparing radial permanent magnetic ring |
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CN104347261A (en) * | 2014-10-10 | 2015-02-11 | 宁波金鸡强磁股份有限公司 | Orientation device and orientation method for radiation ring magnet |
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CN108922764B (en) * | 2018-06-08 | 2021-06-04 | 深圳市瑞达美磁业有限公司 | Processing method of radiation orientation sintering magnetic ring |
CN109435017A (en) * | 2018-11-27 | 2019-03-08 | 闫溪 | A kind of permanent-magnet ferrite hydraulic press magnetic field optimization structure |
CN113579230B (en) * | 2021-06-29 | 2023-12-22 | 台州市铭冠机械有限公司 | Double-layer magnetic powder uniform filling and pre-pressing integrated device |
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US20060022782A1 (en) * | 2002-08-29 | 2006-02-02 | Shin-Etsu Chemical Co., Ltd. | Radial anisotropic ring magnet and method of manufacturing the ring magnet |
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JPH01147819A (en) * | 1987-12-03 | 1989-06-09 | Hitachi Metals Ltd | Method and device for molding anisotropic ring-shaped permanent magnet |
JPH0339415A (en) * | 1989-07-06 | 1991-02-20 | Mitsubishi Materials Corp | Heat treatment method in magnetic field giving ring-like magnet alloy radial magnetic anisotropy |
JPH07211567A (en) * | 1994-01-11 | 1995-08-11 | Mitsubishi Materials Corp | Method of molding cylindrical radial anisotropic bonded magnet |
JP2002030304A (en) * | 2000-07-11 | 2002-01-31 | Yoshihiro Okuda | Method and apparatus for forming radial magnetic field |
JP4133686B2 (en) * | 2002-08-29 | 2008-08-13 | 信越化学工業株式会社 | Radial anisotropic ring magnet and manufacturing method thereof |
WO2005124800A1 (en) * | 2004-06-22 | 2005-12-29 | Shin-Etsu Chemical Co., Ltd. | Methods of producing radial anisotropic cylinder sintered magnet and permanent magnet motor-use cylinder multi-pole magnet |
CN1934662B (en) * | 2004-06-22 | 2010-10-06 | 信越化学工业株式会社 | Radial anisotropic cylindrical sintered magnet and permanent magnet motor |
JP4315340B2 (en) * | 2004-06-30 | 2009-08-19 | Tdk株式会社 | Magnetic field forming method, radial anisotropic ring magnet manufacturing method, magnetic field forming apparatus and radial anisotropic ring magnet |
JP2006019386A (en) * | 2004-06-30 | 2006-01-19 | Tdk Corp | Compacting method in magnetic field, method for manufacturing radial anisotropic ring magnet, and compacting apparatus in magnetic field |
WO2007069454A1 (en) * | 2005-12-13 | 2007-06-21 | Shin-Etsu Chemical Co., Ltd. | Process for producing radially anisotropic magnet |
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- 2008-03-27 CN CN2008100662694A patent/CN101256898B/en active Active
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- 2009-02-11 US US12/378,230 patent/US20090246063A1/en not_active Abandoned
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US20060022782A1 (en) * | 2002-08-29 | 2006-02-02 | Shin-Etsu Chemical Co., Ltd. | Radial anisotropic ring magnet and method of manufacturing the ring magnet |
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CN113977856A (en) * | 2021-10-22 | 2022-01-28 | 杭州千石科技有限公司 | Electromagnetic field radiation orientation device of annular injection molding magnet |
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CN101256898B (en) | 2011-06-29 |
JP2009239287A (en) | 2009-10-15 |
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