CN114709066A - Method for manufacturing permanent magnetic ferrite thin-wall magnetic shoe - Google Patents
Method for manufacturing permanent magnetic ferrite thin-wall magnetic shoe Download PDFInfo
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- CN114709066A CN114709066A CN202210397182.5A CN202210397182A CN114709066A CN 114709066 A CN114709066 A CN 114709066A CN 202210397182 A CN202210397182 A CN 202210397182A CN 114709066 A CN114709066 A CN 114709066A
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- magnetic
- magnetic shoe
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- shoe
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- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims description 18
- 238000003825 pressing Methods 0.000 claims abstract description 37
- 238000005245 sintering Methods 0.000 claims abstract description 36
- 238000004140 cleaning Methods 0.000 claims abstract description 11
- 238000004321 preservation Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 7
- 239000000696 magnetic material Substances 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
- B24B19/22—Single-purpose machines or devices for particular grinding operations not covered by any other main group characterised by a special design with respect to properties of the material of non-metallic articles to be ground
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/06—Dust extraction equipment on grinding or polishing machines
Abstract
The invention discloses a manufacturing method of a permanent magnetic ferrite thin-wall magnetic shoe, relates to the technical field of permanent magnetic materials, and aims to solve the problem that the magnetic field strength of the permanent magnetic ferrite thin-wall magnetic shoe cannot meet the requirement of a motor sensor with a certain distance; selecting a magnetic shoe with a radian, orienting and pressing the magnetic shoe with the radian into a pressed blank, wherein the axial direction of the magnetic shoe with the radian is parallel to the direction of an oriented magnetic field, and the pressing direction is parallel to the axial direction of the magnetic shoe; placing the convex arc surface of the magnetic shoe pressed compact downwards on a burning bearing plate for sintering; after the sintered blank is cooled, grinding each surface to a required size, and cleaning surface scraps; magnetizing the ground magnetic shoe to obtain a finished product thin-wall magnetic shoe; the invention has simple and convenient operation, and the magnetic field intensity at the shaft end can meet the application scene of the motor sensor that the magnetic field signal has a certain distance requirement from the surface of the rotor.
Description
Technical Field
The invention relates to the technical field of permanent magnet materials, in particular to a method for manufacturing a permanent magnetic ferrite thin-wall magnetic shoe.
Background
The magnetic material is a basic functional material in the electronic industry. The permanent magnetic material is an important component of the magnetic material, and plays an important role in the industries such as the electronic industry, the information industry, motorcycles, electric tools industry, automobile industry and the like. The permanent magnetic ferrite material is a functional material for generating a magnetic field.
The permanent magnetic ferrite thin-wall magnetic shoe is mainly matched with a sensor in specific motor design, generally, the permanent magnetic ferrite thin-wall magnetic shoe is produced in a radial orientation mode, in the application field of some special motor sensors, a magnetic field signal has a certain distance requirement from the surface of a rotor, a common magnetic field with a distance of 50-200Gs is required to be 10-20mm away from the axial direction of the magnetic shoe, the magnetic field is found to be weak after the magnetic shoe is selected for magnetizing and assembling, and the magnetic field is only about 30Gs at a position 10mm away from the axial direction of the magnetic shoe, so that the requirement cannot be met. Therefore, a new technique for manufacturing a thin-walled magnetic shoe of permanent magnetic ferrite is needed to solve the problem.
Disclosure of Invention
The invention aims to provide a manufacturing method of a permanent magnetic ferrite thin-wall magnetic shoe, which aims to solve the problem that the permanent magnetic ferrite thin-wall magnetic shoe cannot meet the requirement of low magnetic field intensity in some motor sensor application scenes.
In order to achieve the purpose, the invention provides the following technical scheme: a manufacturing method of a permanent magnetic ferrite thin-wall magnetic shoe comprises the following steps: selecting magnetic shoes with radian, wherein the axial direction of the magnetic shoes with the radian is parallel to the direction of the oriented magnetic field, and the pressing direction is parallel to the direction of the oriented magnetic field to prepare a pressed blank; the convex cambered surface of the magnetic shoe pressed compact is laid down and placed on a burning bearing plate for sintering; after the sintered blank is cooled, grinding each surface to a required size, and cleaning surface scraps; and magnetizing the ground magnetic shoe to obtain the finished product thin-wall magnetic shoe.
Preferably, the wall thickness of the finished thin-wall magnetic tile is 1-3 mm.
Preferably, the wall thickness of the finished product thin-wall magnetic tile is 2-3 mm.
Preferably, the pressing adopts a wet pressing forming process, and the pressing direction is a vertical direction.
Preferably, the sintering temperature is 1150-1300 ℃, the sintering time is 8-15h, and the high-temperature heat preservation time is 2-3 h.
Preferably, the magnetic field intensity of the finished product thin-wall magnetic tile is tested to be 50-200Gs at the position 10-20mm away from the two axial ends of the magnetic tile.
Preferably, the magnetic field intensity of the finished product thin-wall magnetic shoe is tested to be 120-200Gs at the position 10mm away from the two axial ends of the magnetic shoe, and the magnetic field intensity of the magnetic shoe is tested to be 50-120Gs at the position 20mm away from the two axial ends of the magnetic shoe.
Preferably, the magnetic shoe is axially oriented, is vertically placed in a magnetizing clamp for magnetizing, and is alternately packaged by an axial end surface N/S pole during assembly.
Compared with the prior art, the invention has the beneficial effects that:
1. the manufacturing method of the permanent magnetic ferrite thin-wall magnetic shoe is simple and convenient to operate, original main equipment and process routes are not changed basically, mold design and manufacturing are changed mainly, the magnetic shoe mold cavity is horizontally arranged to be vertically arranged, and the manufacturing cost of the mold is not increased.
2. According to the manufacturing method of the permanent magnetic ferrite thin-wall magnetic shoe, the placing mode during sintering of the pressed compact is changed from the existing vertical placing mode to the horizontal placing mode, and the deformation degree of the magnetic shoe in the scheme during sintering is reduced.
3. The magnetic field intensity of the permanent magnetic ferrite thin-wall magnetic shoe manufactured by the method can reach 200Gs at the position 10mm away from the two axial ends of the magnetic shoe, can reach 120Gs at the position 20mm away from the two axial ends of the magnetic shoe, and can meet the related requirements of a magnetic field signal of a motor sensor.
Drawings
FIG. 1 is a schematic diagram showing the directional relationship between the orientation magnetic field and the magnetic shoe according to the present invention.
Detailed Description
A manufacturing method of a permanent magnetic ferrite thin-wall magnetic shoe comprises the following steps: manufacturing a vertical cavity magnetic shoe mold, wherein the mold cavity and the magnetic field direction are the same as those shown in figure 1, namely the orientation direction of the axial thin-wall magnetic shoe is parallel to the magnetic field direction, the pressing direction is parallel to the axial direction of the magnetic shoe, and a pressed blank is pressed by adopting a conventional wet pressing forming process without changing the original vertical pressing direction; the convex cambered surface of the magnetic shoe pressed compact is laid down downwards and placed on a burning bearing plate for sintering, and optionally, the sintering temperature is 1150-plus-material 1300 ℃, the sintering time is 5-15h, and the high-temperature heat preservation is 2-3 h; after the sintered blank is cooled, grinding each surface to a required size, and cleaning surface scraps; magnetizing the grinded magnetic shoe to obtain a finished product thin-wall magnetic shoe, wherein the thickness of the finished product thin-wall magnetic shoe is preferably 1-3 mm; the preferred mode of magnetizing is that the magnetic shoe is axially and vertically placed in the magnetizing clamp for magnetizing, namely, axial magnetizing is carried out, and N/S poles are alternately packaged during assembly.
Example 1:
selecting a magnetic shoe, setting the axial direction to be parallel to the direction of an oriented magnetic field, setting the pressing direction to be parallel to the direction of the magnetic field, adopting a wet pressing forming process, orienting and pressing the magnetic shoe into a pressed blank from top to bottom; the convex cambered surface of the magnetic shoe pressed compact is laid down downwards and is placed on a burning bearing plate for sintering, the sintering temperature is 1230 ℃, the sintering time is 10 hours in total, and the high-temperature heat preservation is carried out for 3 hours; after the sintered blank is cooled, grinding each surface to the required size, and cleaning surface chips; and (3) axially and vertically placing the ground magnetic shoe in a magnetizing fixture for axial magnetizing to obtain a finished product thin-wall magnetic shoe, wherein the size of the finished product thin-wall magnetic shoe is 30mm in outer diameter, 25mm in inner diameter, 15.5mm in chord length, 2.5mm in thickness and 10mm in height, and the magnetic field intensity at the positions of 10mm, 15mm and 20mm at two ends in the height direction (magnetizing direction) is tested for multiple times.
Example 2:
selecting a magnetic shoe, setting the axial direction to be parallel to the direction of an oriented magnetic field, setting the pressing direction to be parallel to the direction of the magnetic field, pressing from top to bottom, adopting a wet pressing forming process, orienting and pressing into a pressed blank; the magnetic shoe pressed compact is laid horizontally with the convex cambered surface facing downwards and is placed on a burning bearing plate for sintering, the sintering temperature is 11800 ℃, the sintering is carried out for 12min, and the high-temperature heat preservation is carried out for 3 h; after the sintered blank is cooled, grinding each surface to a required size, and cleaning surface scraps; and (3) axially and vertically placing the ground magnetic shoe in a magnetizing fixture for axial magnetizing to obtain a finished product thin-wall magnetic shoe, wherein the size of the finished product thin-wall magnetic shoe is 20mm in outer diameter and 14mm in inner diameter, and 5.2mm in chord length, 3mm in thickness and 6mm in height, and the magnetic field intensity at the positions of 10mm, 15mm and 20mm at two ends in the height direction (magnetizing direction) is tested for multiple times.
Example 3:
selecting a magnetic shoe, setting the axial direction of the magnetic shoe to be parallel to the direction of the oriented magnetic field, pressing the magnetic shoe from top to bottom, adopting a wet pressing forming process, setting the pressing direction to be vertical, orienting and pressing the magnetic shoe into a pressed blank; the convex surface of the magnetic tile green compact is laid flat on a burning bearing plate for sintering, the sintering temperature is 1200 ℃, the sintering time is 15 hours, and the high temperature heat preservation time is 2 hours; after the sintered blank is cooled, grinding each surface to a required size, and cleaning surface scraps; and (3) vertically placing the ground magnetic tile into a magnetizing fixture for magnetizing, wherein the magnetizing direction is the axial direction, obtaining a finished product thin-wall magnetic tile, the size of the finished product thin-wall magnetic tile is 40mm in outer diameter, 36mm in inner diameter, 20mm in chord length, 2mm in thickness and 8mm in height, and testing the magnetic field intensity at 10mm, 15mm and 20mm positions at two ends in the axial direction (magnetizing direction) for multiple times.
Example 4:
selecting a magnetic shoe, setting the axial direction of the magnetic shoe to be parallel to the direction of the oriented magnetic field, pressing the magnetic shoe from top to bottom, adopting a wet pressing forming process, setting the pressing direction to be vertical, orienting and pressing the magnetic shoe into a pressed blank; putting the convex surface of the magnetic shoe pressed compact on a burning bearing plate for sintering, wherein the sintering temperature is 1280 ℃, the sintering time is 10min, and the high-temperature heat preservation is carried out for 2 h; after the sintered blank is cooled, grinding each surface to a required size, and cleaning surface scraps; and (3) vertically placing the ground magnetic shoe in a magnetizing fixture for magnetizing, wherein the magnetizing direction is the axial direction, so that a finished product thin-wall magnetic shoe is obtained, the size of the finished product thin-wall magnetic shoe is 32mm in outer diameter, 27.6mm in inner diameter, 16mm in chord length, 2.2mm in thickness and 5.5mm in height, and the magnetic field intensity at the positions of 10mm, 15mm and 20mm at two ends in the axial direction (magnetizing direction) is tested for multiple times.
Comparative example 1:
selecting the same magnetic shoe as the embodiment 1, wherein the orientation direction is the thickness direction, adopting a wet pressing forming process, the pressing direction is parallel to the orientation magnetic field direction and is vertical to the plane of the chord of the cambered surface of the magnetic shoe, orienting and pressing into a green compact; vertically placing the magnetic shoe pressed compact on a burning bearing plate for sintering, wherein the sintering temperature is 1200 ℃, the sintering time is 10 hours, and the high-temperature heat preservation time is 3 hours; after cooling the sintered blank, grinding each surface to the same size as in example 1, and cleaning the surface chips; and flatly placing the ground magnetic shoe in a magnetizing fixture for magnetizing in the orientation direction to obtain a finished product thin-wall magnetic shoe, and testing the magnetic field intensity at the positions of 10mm, 15mm and 20mm at the two ends in the axial direction for many times.
Comparative example 2:
selecting the same magnetic shoe as the embodiment 2, wherein the orientation direction is the thickness direction, adopting a wet pressing forming process, the pressing direction is parallel to the orientation magnetic field direction and is vertical to the plane where the chord of the cambered surface of the magnetic shoe is positioned, orienting and pressing into a pressed blank; vertically placing the magnetic shoe pressed compact on a burning bearing plate for sintering, wherein the sintering temperature is 1300 ℃, the sintering time is 9min, and the high-temperature heat preservation time is 2 h; after cooling the sintered blank, grinding each surface to the same size as in example 2, and cleaning the surface chips; and (3) radially magnetizing the ground magnetic shoe to obtain a finished product thin-wall magnetic shoe, and testing the magnetic field intensity at the positions of 10mm, 15mm and 20mm at the two ends in the axial direction for multiple times.
Comparative example 3:
selecting magnetic shoes with the same size as that of the embodiment 4, wherein the orientation direction is the radial direction, adopting a wet pressing forming process, the pressing direction is parallel to the orientation magnetic field direction, pressing from top to bottom, orienting and manufacturing a pressed blank; the magnetic tile pressed compact is laid on a sintering bearing plate according to the convex surface and sintered, the sintering temperature is 1200 ℃, the sintering time is 15 hours, and the high temperature is kept for 2 hours; after cooling the sintered blank, grinding each surface to the same size as in example 4, and cleaning the surface chips; and (3) putting the ground magnetic shoe into a magnetizing fixture to be magnetized in the radial direction, wherein the magnetizing direction is the thickness direction of the magnetic shoe, obtaining a finished product thin-wall magnetic shoe, and testing the magnetic field intensity at the positions of 10mm, 15mm and 20mm at the two ends of the magnetic shoe in the axial direction for many times.
The results of the tests of the above examples and comparative examples are as follows:
| 10mm | 15mm | 20mm | |
| example 1 | 190Gs±10Gs | 150Gs±10Gs | 100Gs±15Gs |
| Example 2 | 180Gs±10Gs | 140Gs±10Gs | 100Gs±15Gs |
| Example 3 | 140Gs±10Gs | 100Gs±10Gs | 80Gs±15Gs |
| Example 4 | 130Gs±10Gs | 100Gs±10Gs | 70Gs±15Gs |
| Comparative example 1 | 80Gs±10Gs | 50Gs±10Gs | 30Gs±5Gs |
| Comparative example 2 | 40Gs±5Gs | 25Gs±5Gs | 15Gs±5Gs |
| Comparative example 3 | 60Gs±10Gs | 30Gs±5Gs | 20Gs±5Gs |
From the above examples and comparative examples, it can be seen that the comparative example 1 is different from the example 1 only in the orientation direction and the sintering process, the comparative example 2 is different from the example 2 in the orientation and the sintering process, and the comparative example 3 is different from the example 4 in the orientation direction and the sintering mode.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
The present invention is not described in detail, but is known to those skilled in the art.
Claims (8)
1. A manufacturing method of a permanent magnetic ferrite thin-wall magnetic shoe is characterized by comprising the following steps: selecting a magnetic shoe with a radian, wherein the axial direction of the magnetic shoe with the radian is parallel to the direction of the oriented magnetic field, and the pressing direction is parallel to the direction of the oriented magnetic field to prepare a pressed blank; the convex cambered surface of the magnetic shoe pressed compact is laid down and placed on a burning bearing plate for sintering; after the sintered blank is cooled, grinding each surface to a required size, and cleaning surface scraps; and magnetizing the ground magnetic shoe to obtain the finished product thin-wall magnetic shoe.
2. The manufacturing method of the permanent magnetic ferrite thin-wall magnetic shoe according to claim 1, characterized in that: the wall thickness of the finished product thin-wall magnetic tile is 1-3 mm.
3. The manufacturing method of the permanent magnetic ferrite thin-wall magnetic shoe according to claim 2, characterized in that: the wall thickness of the finished product thin-wall magnetic tile is 2-3 mm.
4. The manufacturing method of the permanent magnetic ferrite thin-wall magnetic shoe according to claim 1, characterized in that: the pressing adopts a wet pressing forming process, and the pressing direction is vertical.
5. The manufacturing method of the permanent magnetic ferrite thin-wall magnetic shoe according to claim 1, characterized in that: the sintering temperature is 1150-1300 ℃, the sintering time is 8-15h, and the high-temperature heat preservation time is 2-3 h.
6. The manufacturing method of the permanent magnetic ferrite thin-wall magnetic shoe according to claim 1, characterized in that: and testing the finished product thin-wall magnetic shoe, wherein the magnetic field intensity at the position 10-20mm away from the two axial ends of the magnetic shoe is 50-200 Gs.
7. The manufacturing method of the permanent magnetic ferrite thin-wall magnetic shoe according to claim 6, characterized in that: and testing the finished product thin-wall magnetic shoe, wherein the magnetic field intensity at the position 10mm away from the two axial ends of the magnetic shoe is 120-200Gs, and the magnetic field intensity at the position 20mm away from the two axial ends of the magnetic shoe is 50-120 Gs.
8. The manufacturing method of the permanent magnetic ferrite thin-wall magnetic shoe according to claim 1, characterized in that: the magnetic shoes are axially oriented, vertically placed in a magnetizing clamp for magnetizing, and N/S poles on the axial end faces are alternately packaged during assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210397182.5A CN114709066A (en) | 2022-04-15 | 2022-04-15 | Method for manufacturing permanent magnetic ferrite thin-wall magnetic shoe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210397182.5A CN114709066A (en) | 2022-04-15 | 2022-04-15 | Method for manufacturing permanent magnetic ferrite thin-wall magnetic shoe |
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| CN114709066A true CN114709066A (en) | 2022-07-05 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201534370U (en) * | 2009-04-22 | 2010-07-28 | 邓崇岭 | Axially oriented die for large-scale ferrite plastic-magnetic product |
| CN102779639A (en) * | 2012-08-14 | 2012-11-14 | 安徽大学 | Method for preparing multi-pole anisotropic permanent magnet ring |
| CN104505990A (en) * | 2014-09-15 | 2015-04-08 | 横店集团东磁股份有限公司 | Preparation method for sintering permanent magnetic ferrite ring of brushless motor |
| CN105741994A (en) * | 2016-02-04 | 2016-07-06 | 李忠 | Manufacturing method of neodymium-iron-boron magnet |
| CN206727745U (en) * | 2017-05-11 | 2017-12-08 | 马鞍山市鑫洋永磁有限责任公司 | A kind of green structure of small extreme difference square magnetic shoe |
-
2022
- 2022-04-15 CN CN202210397182.5A patent/CN114709066A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201534370U (en) * | 2009-04-22 | 2010-07-28 | 邓崇岭 | Axially oriented die for large-scale ferrite plastic-magnetic product |
| CN102779639A (en) * | 2012-08-14 | 2012-11-14 | 安徽大学 | Method for preparing multi-pole anisotropic permanent magnet ring |
| CN104505990A (en) * | 2014-09-15 | 2015-04-08 | 横店集团东磁股份有限公司 | Preparation method for sintering permanent magnetic ferrite ring of brushless motor |
| CN105741994A (en) * | 2016-02-04 | 2016-07-06 | 李忠 | Manufacturing method of neodymium-iron-boron magnet |
| CN206727745U (en) * | 2017-05-11 | 2017-12-08 | 马鞍山市鑫洋永磁有限责任公司 | A kind of green structure of small extreme difference square magnetic shoe |
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