A magnet processing system and a magnet processing method

Abstract

The present invention belongs to the technical field of magnet manufacturing, and specifically relates to a magnet processing system and a magnet processing method. The magnet processing system includes a supporting device and a grinding device. The supporting device is used to support the magnet to be ground. The grinding device includes a grinding wheel for grinding the magnet and a first driving motor for driving the grinding wheel to rotate. The grinding wheel includes a base and a grinding blade surrounding the base. The grinding blade is a cubic boron nitride grinding blade containing cubic boron nitride granular material. The magnet processing system of the present application significantly increases the service life of the grinding wheel, not only reduces the frequency of grinding wheel replacement, but also improves the stability of magnet grinding; at the same time, it also reduces the requirements for coolant and cooling devices during the processing process, further reducing the manufacturing cost of the magnet processing system; further, the processed magnet has good surface quality, high smoothness, and high dimensional accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of magnet manufacturing, and in particular relates to a magnet processing system and a magnet processing method. Background Art

[0002] As the third generation of rare earth permanent magnet materials, NdFeB magnets have been widely used due to their excellent magnetic properties and better cost performance. The emergence of NdFeB permanent magnets not only makes the motor electroacoustics, instrumentation, magnetic separation magnetization, medical equipment and other equipment develop in the direction of miniaturization, high frequency, high performance, low loss and low noise, but also expands its application from traditional fields to emerging fields such as new energy vehicles, wind power generation, energy-saving home appliances and aerospace with its energy-saving and environmental protection characteristics.

[0003] At present, diamond grinding wheels are often used as cutting tools in the grinding and cutting of rare earth permanent magnets. In the actual research process, the inventors found that there are still problems with this processing method, as follows:

[0004] For rare earth permanent magnets, especially NdFeB magnets, which are hard and brittle, the heat resistance and wear resistance of current grinding wheels are poor. Even with coolant cooling during the grinding process, the grinding wheels will wear out quickly and have a short service life. Continuing to use grinding wheels that have been worn to a certain extent to process rare earth permanent magnets can easily lead to defects in permanent magnet products.

[0005] Therefore, there is a need to design a magnet processing device and a processing method for magnet processing that can increase the service life of grinding tools and ensure the quality of magnet products. Summary of the invention

[0006] The purpose of the present invention is to provide a magnet processing device and a processing method for magnet processing, which can increase the service life of the grinding tool and ensure the quality of the magnet product, in view of the shortcomings of the current magnet processing process, such as the short service life of the grinding wheel, which easily leads to defects in the magnet product.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] A magnet processing system comprises a supporting device and a grinding device, wherein the supporting device is used to support the magnet to be ground, the grinding device comprises a grinding wheel for grinding the magnet and a first driving motor for driving the grinding wheel to rotate, the grinding wheel comprises a base body and a grinding edge surrounding the base body, and the grinding edge is a cubic boron nitride grinding edge containing cubic boron nitride granular material.

[0009] In the scheme of the present application, when in use, the magnet to be ground is arranged on the supporting device, and the grinding wheel of the grinding device rotates under the drive of the first driving motor, and grinds the magnet through its grinding blade. Since the grinding blade contains cubic boron nitride granular material, cubic boron nitride has not only high hardness but also significantly better heat resistance than diamond. As the grinding blade material of the grinding wheel, its advantages are as follows: the service life of the grinding wheel is significantly increased; the service life of the grinding wheel is extended, and the service life can be increased by 30-80% relative to the diamond grinding wheel, which not only reduces the frequency of grinding wheel replacement, but also improves the stability of magnet grinding; at the same time, The requirements for coolant are also reduced. The cooling effect during the processing can be guaranteed by the spraying method. At the same time, there are no high requirements for the friction coefficient of the coolant, whether to add a defoaming agent, and the spraying pressure of the coolant. In this way, the requirements for the coolant are also reduced, and the manufacturing cost of the magnet processing system is further reduced. Furthermore, due to the high heat resistance of cubic boron nitride materials, the risk of grinding defects such as cracking and defects is reduced during grinding. Therefore, the surface quality of the processed magnet is good, the finish is high, and the dimensional accuracy is high. The finish can reach ▽7-8μm, and the dimensional accuracy can reach ≤0.01 mm.

[0010] Preferably, the grinding wheel is arranged on the rotating shaft of the first driving motor.

[0011] Preferably, in the cubic boron nitride grinding edge, the volume percentage of the cubic boron nitride is 20-80%.

[0012] Preferably, the cubic boron nitride particle size is 80-325 mesh.

[0013] Preferably, the grinding blade also contains other abrasive particles, such as diamond particles, corundum particles, etc.

[0014] The grinding edge with the above cubic boron nitride particle parameters ensures that the cubic boron nitride particles enhance the grinding performance of the grinding edge.

[0015] Preferably, the grinding blade further contains a binder.

[0016] Preferably, the adhesive is one or a combination of resin adhesive, ceramic adhesive and metal adhesive. The strength of the grinding edge is further increased by the adhesive.

[0017] Preferably, the matrix is ​​made of an alloy material. The alloy material in the present application is a high-strength, high-toughness alloy material, such as 60Si2Mn spring steel, 20MoV low-carbon alloy steel, etc.

[0018] Preferably, there are at least two grinding wheels.

[0019] Preferably, the spacing between the grinding wheels is adjustable.

[0020] In actual grinding, by providing at least two grinding wheels with an adjustable spacing between the grinding wheels, multiple magnets can be ground at a time, thereby improving the magnet processing efficiency.

[0021] Preferably, the grinding device includes a first slide rail and a second slide rail, a first slide seat is slidably arranged on the first slide rail, the second slide rail is arranged on the first slide seat, a second slide seat is slidably arranged on the second slide rail, and the first drive motor is arranged on the second slide seat. By sliding the first slide seat and the second slide seat, the position of the first drive motor is adjusted, and then the position of the grinding wheel is adjusted, which further facilitates the grinding of the magnet.

[0022] Preferably, the sliding direction of the first slide is parallel to the axial direction of rotation of the grinding wheel, and the sliding direction of the second slide is perpendicular to the axial direction of rotation of the grinding wheel. In actual work, the first slide is slid to bring the grinding wheel close to the magnet, and then the second slide is slid to feed, thereby achieving grinding of the magnet by the grinding wheel.

[0023] Preferably, the linear speed of the grinding wheel is 10-120 m / s. In actual research and development and production, the inventors found that when the linear speed of the grinding wheel is less than 10 m / s, in addition to low processing efficiency, it is also easy to cause abnormal wear of the grinding wheel; when the linear speed of the grinding wheel is greater than 120 m / s, the grinding wheel will vibrate abnormally during grinding, resulting in poor processing accuracy.

[0024] As a preferred embodiment, the supporting device is a rotating shaft of the second driving motor, or a rotating shaft driven by the second driving motor through a transmission assembly.

[0025] As a preferred embodiment, the magnet is annular and is sleeved on the rotating shaft.

[0026] As a preferred embodiment, the magnet is block-shaped and is placed statically on the support device. In the solution of the present application, the magnet is block-shaped and is placed statically on the support device, that is, the support device does not drive the magnet to move, and the magnet remains static during the grinding process.

[0027] Preferably, the linear speed of the magnet rotation is 5-30 mm / min.

[0028] Preferably, the magnet and the grinding wheel rotate in the same direction.

[0029] As mentioned above, when the magnet is annular, the magnet is rotated, so that the relative speed between the magnet and the grinding wheel is increased, thereby further improving the grinding efficiency and the finish of the grinding, and the grinding wheel will not vibrate abnormally due to the high rotation speed.

[0030] Preferably, the cutting speed of the grinding wheel for machining the magnet is 1 to 10 mm / min. In actual research and development and production, the inventors found that if the grinding wheel cutting speed is lower than 1 mm / min, the processing efficiency is low and the cost is increased; and if the grinding wheel cutting speed exceeds 10 mm / min, the grinding wheel will also suffer abnormal wear.

[0031] Preferably, the magnet processing system also includes a cooling system, and the cooling system includes a nozzle, and the nozzle is used to spray coolant toward the grinding edge. By setting up a cooling device, the grinding wheel and the magnet are cooled to ensure the reliable grinding process and avoid strong oxidation of the magnet due to temperature increase; and, since the present application uses a cubic boron nitride grinding edge, spray cooling can be used. Compared with the cooling method of traditional grinding, the cooling system of the present application does not have high requirements for the friction coefficient of the coolant, whether to add a defoaming agent, and the spray pressure of the coolant.

[0032] Preferably, the flow rate of the cooling liquid sprayed by the nozzle is 5-50 L / min.

[0033] Preferably, the flow rate of the cooling liquid sprayed by the nozzle is 15-30 L / min.

[0034] In actual research and development and production, the inventors found that when the coolant flow rate is lower than 5L / min, insufficient coolant is supplied to the grinding edge of the grinding wheel, which will cause an abnormal temperature rise of the grinding wheel and the processing magnet due to insufficient cooling; when the coolant flow rate is greater than 50L / min, on the one hand, it causes excessive waste of coolant and increases power costs; on the other hand, it will have a greater impact on the grinding wheel and adversely affect its rotation, resulting in a decrease in processing accuracy.

[0035] Preferably, the coolant is an alkaline coolant with a pH value greater than 7. The pH value of the coolant is greater than 7 and is alkaline, which prevents the acidic solution from corroding the magnet.

[0036] Preferably, the coolant is mainly composed of water. Using water as the main component of the coolant can reduce the cost of the coolant while ensuring the cooling effect, thereby reducing the cost of magnet grinding.

[0037] Preferably, a defoaming agent is added to the coolant.

[0038] Preferably, lubricant and defoaming agent are added to the coolant.

[0039] As mentioned above, a lubricant and / or a defoaming agent is provided in the coolant to ensure the quality of the coolant, facilitate the reuse of the coolant and improve the cooling effect of the coolant.

[0040] Preferably, the grinding wheel has a diameter of 50-150 mm and a thickness of 0.2-1.5 mm;

[0041] The magnet of the present application, when the magnet is ring-shaped, rotates at a certain speed during the cutting process. The rotation speed of the magnet is positively correlated with the diameter of the magnet, that is, the larger the diameter of the magnet, the greater the suitable rotation speed. The use of a suitable alloy magnetic ring rotation speed can, on the one hand, ensure higher processing efficiency, and on the other hand, ensure higher processing accuracy and a longer service life of the grinding wheel.

[0042] A magnet processing method using the magnet processing system comprises the following steps:

[0043] Step A: Installation step: placing the grinding wheel on the rotating shaft of the first driving motor, and placing the magnet on the supporting device;

[0044] Step B: Cooling step: starting the cooling system to spray the coolant on the grinding wheel;

[0045] Step C: Grinding step: Start the first drive motor to rotate the grinding wheel, and move the support device or the grinding device so that the grinding edge of the grinding wheel contacts the magnet, so as to grind the magnet by the grinding wheel to obtain a magnet part.

[0046] Since the above-mentioned magnet processing system is adopted and the magnet manufacturing method of the present application is adopted, the service life of the grinding wheel is significantly increased, which not only reduces the frequency of grinding wheel replacement, but also improves the stability of magnet grinding; at the same time, the requirements for coolant are also reduced, further reducing the manufacturing cost of the magnet processing system; further, due to the high heat resistance of cubic boron nitride material, the risk of grinding defects such as cracking and defects is reduced during grinding, so the processed magnet has good surface quality, high smoothness and high dimensional accuracy.

[0047] Preferably, step C is followed by step D: preservation: placing the magnet obtained in step C into an aqueous solution of a rust inhibitor.

[0048] The processing method of the present application stores the processed magnet parts in an aqueous solution with a rust inhibitor added, thereby avoiding the influence of the processing effect caused by adding a rust inhibitor to the coolant, and also avoiding the oxidation and rust of the permanent magnet alloy due to the loss of the coolant when the product is placed after processing. Since the rare earth permanent magnet alloy workpiece is kept in the rust inhibitor, it is beneficial to its protection work before entering the subsequent process.

[0049] Preferably, step E is further provided after step C: collecting: collecting the magnet wear debris obtained in step C. The magnet wear debris is collected and centrally processed or reused.

[0050] Preferably, the magnet is a hot pressed NdFeB magnet.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] The magnet processing system of the present application, when in use, the magnet to be ground is arranged on the supporting device, the grinding wheel of the grinding device rotates under the drive of the first driving motor, and grinds the magnet through its grinding blade. Since the grinding blade contains cubic boron nitride granular material, cubic boron nitride has not only high hardness but also heat resistance that is significantly better than diamond. As the grinding blade material of the grinding wheel, its advantages are as follows: the service life of the grinding wheel is significantly increased; the service life of the grinding wheel is extended, and the service life can be increased by 30 to 80% relative to the diamond grinding wheel, which not only reduces the frequency of grinding wheel replacement, but also improves the stability of magnet grinding; at the same time , and also reduces the requirements for coolant. The spraying method can ensure the cooling effect during the processing. At the same time, there are no high requirements for the friction coefficient of the coolant, whether to add defoaming agent, and the spraying pressure of the coolant. In this way, the requirements for coolant are also reduced, and the manufacturing cost of the magnet processing system is further reduced; further, due to the high heat resistance of cubic boron nitride materials, the risk of grinding defects such as cracking and defects is reduced during grinding. Therefore, the surface quality of the processed magnet is good, the finish is high, and the dimensional accuracy is high. The finish can reach ▽7~8μm, and the dimensional accuracy can reach ≤0.01 mm;

[0053] The magnet processing method of the present application: Since the above-mentioned magnet processing system is adopted, the magnet manufacturing method of the present application significantly increases the service life of the grinding wheel, not only reduces the frequency of grinding wheel replacement, but also improves the stability of magnet grinding; at the same time, it also reduces the requirements for coolant, further reducing the manufacturing cost of the magnet processing system; further, due to the high heat resistance of cubic boron nitride material, the risk of grinding defects such as cracking and defects is reduced during grinding, so the processed magnet has good surface quality, high smoothness and high dimensional accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 This is a schematic diagram of the structure of the magnet processing system of this application;

[0055] Figure 2 For 30-25-50 rare earth permanent bodies, the average service life of the conventional diamond grinding wheel and the cubic silicon nitride grinding wheel is compared;

[0056] Figure 3 This is a comparison table of the relationship between the magnet rotation speed and the magnet outer diameter size;

[0057] Figure 4 This is a flowchart of the processing method of this application.

[0058] Indications in the figure: 1-support device, 2-grinding device, 3-magnet, 4-grinding wheel, 5-first drive motor, 6-second drive motor, 7-first slide rail, 8-second slide rail, 9-first slide seat, 10-second slide seat, 11-nozzle. DETAILED DESCRIPTION

[0059] The present invention is further described in detail below in conjunction with test examples and specific implementation methods, but this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies implemented based on the contents of the present invention belong to the scope of the present invention. Specific implementation 1:

[0061] A magnet processing system, such as Figure 1 As shown, it includes a supporting device 1 and a grinding device 2, wherein the supporting device 1 is used to support a magnet 3 to be ground, the grinding device 2 includes a grinding wheel 4 for grinding the magnet 3 and a first driving motor 5 for driving the grinding wheel 4 to rotate, the grinding wheel 4 includes a base body and a grinding edge surrounding the base body, and the grinding edge is a cubic boron nitride grinding edge containing cubic boron nitride granular material.

[0062] In the scheme of the present application, when in use, the magnet 3 to be ground is arranged on the supporting device 1, and the grinding wheel 4 of the grinding device 2 rotates under the drive of the first driving motor 5, and grinds the magnet 3 through its grinding edge. Since the grinding edge contains cubic boron nitride granular material, cubic boron nitride has a heat resistance significantly better than diamond in addition to having a high hardness. As the grinding edge material of the grinding wheel 4, its advantages are as follows: the service life of the grinding wheel 4 is significantly increased; the extension of the service life of the grinding wheel 4, such as Figure 2 As shown, the service life can be increased by 30-80% relative to the diamond grinding wheel 4, which not only reduces the frequency of replacing the grinding wheel 4, but also improves the stability of the grinding of the magnet 3; at the same time, the requirements for the coolant are also reduced, and the cooling effect during the processing can be ensured by using a spraying method. At the same time, there are no high requirements for the friction coefficient of the coolant, whether to add a defoaming agent, and the spraying pressure of the coolant. In this way, the requirements for the coolant and the cooling device are also reduced, and the manufacturing cost of the magnet 3 processing system is further reduced; further, due to the high heat resistance of the cubic boron nitride material, the risk of grinding defects such as cracking and defects is reduced during grinding. Therefore, the surface quality of the processed magnet 3 is good, the finish is high, and the dimensional accuracy is high. The finish can reach ▽7-8μm, and the dimensional accuracy can reach ≤0.01 mm.

[0063] As a preferred implementation, the grinding wheel 4 is disposed on the rotating shaft of the first driving motor 5 .

[0064] As a preferred implementation, in the cubic boron nitride grinding edge, the volume percentage of the cubic boron nitride is 20-80%.

[0065] As a preferred embodiment, the cubic boron nitride particle size is 80-325 mesh.

[0066] As a preferred embodiment, the grinding blade also contains other abrasive particles, such as diamond particles, corundum particles, etc.

[0067] The grinding edge with the above cubic boron nitride particle parameters ensures that the cubic boron nitride particles enhance the grinding performance of the grinding edge.

[0068] As a preferred embodiment, the grinding blade further contains a binder.

[0069] As a preferred embodiment, the adhesive is one or a combination of resin adhesive, ceramic adhesive and metal adhesive. The strength of the grinding edge is further increased by the adhesive.

[0070] As a preferred embodiment, the substrate is made of an alloy material. The alloy material in the present application is a high-strength, high-toughness alloy material, such as 60Si2Mn spring steel, 20MoV low-carbon alloy steel, etc.

[0071] As a preferred embodiment, there are at least two grinding wheels 4.

[0072] As a preferred embodiment, the distance between the grinding wheels 4 is adjustable.

[0073] In actual grinding, by providing at least two grinding wheels 4 and adjusting the spacing between the grinding wheels 4 , multiple magnet pieces can be ground at a time, thereby improving the processing efficiency of the magnet 3 .

[0074] As a preferred embodiment, the grinding device 2 includes a first slide rail 7 and a second slide rail 8, a first slide seat 9 is slidably arranged on the first slide rail 7, the second slide rail 8 is arranged on the first slide seat 9, a second slide seat 10 is slidably arranged on the second slide rail 8, and the first drive motor 5 is arranged on the second slide seat 10. By sliding the first slide seat 9 and the second slide seat 10, the position of the first drive motor 5 is adjusted, and then the position of the grinding wheel 4 is adjusted, which further facilitates the grinding of the magnet 3.

[0075] As a preferred embodiment, the sliding direction of the first slide 9 is parallel to the rotation axis of the grinding wheel 4, and the sliding direction of the second slide 10 is perpendicular to the rotation axis of the grinding wheel 4. In actual work, the first slide 9 is slid to make the grinding wheel 4 close to the magnet 3, and then the second slide 10 is slid to achieve feeding, thereby achieving grinding of the magnet 3 by the grinding wheel 4.

[0076] As a preferred embodiment, the linear speed of the grinding edge of the grinding wheel 4 is 10-120 m / s. In actual research and development and production, the inventors found that when the linear speed of the grinding wheel 4 is less than 10 m / s, in addition to low processing efficiency, it is also easy to cause abnormal wear of the grinding edge of the grinding wheel 4; when the linear speed of the grinding wheel 4 is greater than 120 m / s, the grinding wheel 4 will vibrate abnormally during the grinding process, resulting in poor processing accuracy.

[0077] As a preferred embodiment, the supporting device 1 is the rotating shaft of the second driving motor 6, or is the rotating shaft driven by the second driving motor 6 through a transmission assembly.

[0078] As a preferred embodiment, the magnet 3 is annular and sleeved on the rotating shaft.

[0079] As another preferred embodiment, the magnet 3 is block-shaped and is stationary on the support device 1. In the scheme of this embodiment, the magnet 3 is block-shaped and is stationary on the support device 1, that is, the support device 1 does not drive the magnet to move, and the magnet 3 remains stationary during the grinding process. Such a setting is conducive to maintaining the stability of the magnet 3 during the grinding process and improving the grinding quality.

[0080] As a preferred embodiment, the linear speed of the rotation of the magnet 3 is 5-30 mm / min.

[0081] As a preferred implementation, the magnet 3 and the grinding wheel 4 rotate in the same direction.

[0082] As mentioned above, when the magnet 3 is annular, the magnet 3 is rotated, so that the relative speed between the magnet 3 and the grinding wheel 4 is increased, thereby further improving the grinding efficiency and the grinding finish, and the grinding wheel 4 will not vibrate abnormally due to the high rotation speed.

[0083] As a preferred embodiment, the cutting speed of the grinding wheel 4 for machining the magnet 3 is 1 to 10 mm / min. In actual research and development and production, the inventors found that if the cutting speed of the grinding wheel 4 is lower than 1 mm / min, the machining efficiency is low and the cost is increased; and if the cutting speed of the grinding wheel 4 exceeds 10 mm / min, the grinding wheel 4 will also suffer abnormal wear.

[0084] As a preferred embodiment, the magnet 3 processing system also includes a cooling system, and the cooling system includes a nozzle 11, and the nozzle 11 is used to spray coolant toward the grinding edge. By setting a cooling device, the grinding wheel 4 and the magnet 3 are cooled to ensure the reliable grinding process and avoid the strong oxidation of the magnet 3 due to the temperature increase; and since the present application uses a cubic boron nitride grinding edge, spray cooling can be used. Compared with the cooling method of traditional grinding, the cooling system of the present application does not have high requirements for the friction coefficient of the coolant, whether to add a defoaming agent, and the spray pressure of the coolant.

[0085] As a preferred implementation, the flow rate of the cooling liquid sprayed by the nozzle 11 is 5-50 L / min.

[0086] As a preferred implementation, the flow rate of the cooling liquid sprayed by the nozzle 11 is 15-30 L / min.

[0087] In actual research and development and production, the inventors found that when the coolant flow rate is lower than 5L / min, insufficient coolant is supplied to the grinding edge of the grinding wheel 4, which will cause an abnormal temperature rise of the grinding wheel 4 and the processing magnet 3 due to insufficient cooling; when the coolant flow rate is greater than 50L / min, on the one hand, it causes excessive waste of coolant and increases power costs; on the other hand, it will have a greater impact on the grinding wheel 4 and have an adverse effect on its rotation, resulting in a decrease in processing accuracy.

[0088] As a preferred embodiment, the coolant is an alkaline coolant with a pH value greater than 7. The pH value of the coolant is greater than 7 and is alkaline, which prevents the acidic solution from corroding the magnet 3 .

[0089] As a preferred embodiment, the coolant is mainly composed of water. Using water as the main component of the coolant can reduce the cost of the coolant while ensuring the cooling effect, thereby reducing the cost of magnet grinding.

[0090] As a preferred implementation, a defoaming agent is added to the coolant.

[0091] As a preferred embodiment, lubricant and defoamer are added to the coolant.

[0092] As mentioned above, a lubricant and / or a defoaming agent is provided in the coolant to ensure the quality of the coolant, facilitate the reuse of the coolant and improve the cooling effect of the coolant.

[0093] As a preferred embodiment, the grinding wheel 4 has a diameter of 50-150 mm and a thickness of 0.2-1.5 mm;

[0094] The magnet 3 of the present application, when the magnet 3 is annular, rotates at a certain speed during the cutting process. Figure 3 As shown, the rotation speed of the magnet 3 is positively correlated with the diameter of the magnet 3, that is, the larger the diameter of the magnet 3, the greater the suitable rotation speed. Using a suitable alloy magnetic ring rotation speed can ensure high processing efficiency on the one hand, and high processing accuracy and a longer service life of the grinding wheel 4 on the other hand.

[0095] Specific implementation method 2, as Figure 4 As shown,

[0096] A magnet processing method using the magnet processing system comprises the following steps:

[0097] Step A: Installation step: setting the grinding wheel 4 on the rotating shaft of the first driving motor 5, and setting the magnet 3 on the supporting device 1;

[0098] Step B: Cooling step: starting the cooling system to spray the coolant on the grinding wheel 4;

[0099] Step C: Grinding step: Start the first drive motor 5 to rotate the grinding wheel 4, and move the support device 1 or the grinding device 2 so that the grinding edge of the grinding wheel 4 contacts the magnet 3, so that the grinding wheel 4 grinds the magnet 3 to obtain a magnet part.

[0100] Since the above-mentioned magnet 3 processing system is adopted and the magnet 3 manufacturing method of the present application is adopted, the service life of the grinding wheel 4 is significantly increased, which not only reduces the frequency of replacing the grinding wheel 4, but also improves the stability of the magnet 3 grinding; at the same time, the requirements for coolant are also reduced, further reducing the manufacturing cost of the magnet 3 processing system; further, due to the high heat resistance of cubic boron nitride material, the risk of grinding defects such as cracking and defects is reduced during grinding, so the processed magnet 3 has good surface quality, high smoothness and high dimensional accuracy.

[0101] As a preferred embodiment, step D is further provided after step C: preservation: placing the three magnets obtained in step C into an aqueous solution of a rust inhibitor.

[0102] The processing method of the present application stores the three processed magnets in an aqueous solution with a rust inhibitor added, thereby avoiding the influence of the processing effect caused by adding a rust inhibitor to the coolant, and also avoiding the oxidation and rust of the permanent magnet alloy due to the loss of the coolant when the product is placed after processing. Since the rare earth permanent magnet alloy workpiece is kept in the rust inhibitor, it is beneficial to its protection work before entering the subsequent process.

[0103] As a preferred embodiment, step E is further provided after step C: collecting: collecting the magnet wear debris obtained in step C. The magnet wear debris is collected and centrally processed or reused.

[0104] As a preferred embodiment, the magnet 3 is a hot-pressed NdFeB magnet.

[0105] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the invention should be included in the scope of the claims of the present invention.

Claims

1. A magnet processing method, characterized in that: The invention comprises a supporting device and a grinding device, wherein the supporting device is used to support a magnet to be ground, the grinding device comprises a grinding wheel for grinding the magnet and a first driving motor for driving the grinding wheel to rotate, the grinding wheel comprises a base body and a grinding edge surrounding the base body, and the grinding edge is a cubic boron nitride grinding edge containing cubic boron nitride granular material; In the cubic boron nitride grinding edge, the volume percentage of the cubic boron nitride is 20-80%; The cubic boron nitride particle size is 80-325 mesh; The linear speed of the grinding wheel grinding edge is 10-120m / s; The supporting device is a rotating shaft of the second driving motor, or a rotating shaft driven by the second driving motor through a transmission assembly; The magnet is annular and sleeved on the rotating shaft; The linear speed of the magnet rotation is 5-30 mm / min, and the magnet and the grinding wheel rotate in the same direction; Also included is a cooling system, the cooling system including a nozzle, the nozzle being used to spray a coolant toward the grinding edge; The steps include: Step A: Installation step: placing the grinding wheel on the rotating shaft of the first driving motor, and placing the magnet on the supporting device; Step B: Cooling step: starting the cooling system to spray the cooling liquid on the grinding wheel; the cooling liquid is an alkaline cooling liquid with a pH value greater than 7; a lubricant and a defoaming agent are added to the cooling liquid; Step C: Grinding step: starting the first driving motor to rotate the grinding wheel, and moving the support device or the grinding device so that the grinding edge of the grinding wheel contacts the magnet, thereby grinding the magnet with the grinding wheel to obtain a magnet part; Step D: Magnet preservation: The magnet obtained in step C is placed in an aqueous solution of a rust inhibitor.

2. The magnet processing method according to claim 1, characterized in that: The grinding blade also contains a binder, which is one or a combination of multiple types of binders, such as resin binders, ceramic binders and metal binders.

3. The magnet processing method according to claim 1, characterized in that: The base body is made of alloy material.

4. The magnet processing method according to claim 1, characterized in that: There are at least two grinding wheels, and the distance between the grinding wheels is adjustable.

5. The magnet processing method according to any one of claims 1 to 4, characterized in that: The grinding device includes a first slide rail and a second slide rail, a first slide seat is slidably arranged on the first slide rail, the second slide rail is arranged on the first slide seat, a second slide seat is slidably arranged on the second slide rail, and the first drive motor is arranged on the second slide seat.

6. The magnet processing method according to claim 5, characterized in that: The sliding direction of the first slide seat is parallel to the axial direction of rotation of the grinding wheel, and the sliding direction of the second slide seat is perpendicular to the axial direction of rotation of the grinding wheel.

7. The magnet processing method according to claim 5, characterized in that: The magnet is block-shaped and is stationary on the supporting device.

8. The magnet processing method according to any one of claims 1 to 4, characterized in that: The cutting speed of the grinding wheel machining magnet is 1 to 10 mm / min.

9. The magnet processing method according to claim 1, characterized in that: The flow rate of the cooling liquid sprayed by the nozzle is 5-50L / min.

10. The magnet processing method according to claim 1, characterized in that: The cooling liquid contains water as a main component.

11. The magnet processing method according to claim 1, characterized in that: A defoaming agent is added into the cooling liquid.

12. The magnet processing method according to claim 1, characterized in that: After step C, step E is further provided: collecting the wear debris: collecting the magnet wear debris obtained in step C.

13. The magnet processing method according to claim 1, characterized in that: The magnets are hot pressed NdFeB magnets.

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