Method, device and system for detecting the magnetic orientation of an uncharged blank

Abstract

The present application relates to the technical field of magnetic orientation detection, and particularly relates to a non-magnetized blank magnetic orientation detection method, device and system, wherein the technical scheme provided by the present application first applies a changing magnetic field to the non-magnetized blank, so that eddy current is generated on the surface of the blank. Since the magnetic permeability of different surfaces of the non-magnetized blank is different, the eddy current generated on different surfaces of the non-magnetized blank is different, so that the inductance of different surfaces of the non-magnetized blank is different. The inductance of different surfaces of the non-magnetized blank is sent to a cloud server. The cloud server judges the magnetic orientation of the non-magnetized blank according to the inductance of different surfaces of the non-magnetized blank obtained, and sends the judgment result to the non-magnetized blank magnetic orientation detection device. The magnetic orientation of the neodymium iron boron blank can be effectively distinguished, and the processing progress of the product can be accelerated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of magnetic orientation detection, and particularly relates to a method, device and system for detecting magnetic orientation of an uncharged magnetic blank. BACKGROUND

[0002] Neodymium iron boron is an anisotropic magnet, and the magnetic properties of the anisotropic magnet are different in different directions. The direction in which the best magnetic properties can be obtained is referred to as the orientation direction of the magnet. Therefore, the alloy powder needs to be oriented in a magnetic field to form a directional structure, and the magnet will have high magnetic properties.

[0003] In the actual production process of the neodymium iron boron magnet, distinguishing the orientation of the neodymium iron boron magnet has been a technical problem that has caused great trouble to actual production, especially for the uncharged magnet, it is more difficult to judge the magnetic orientation of the magnet, which has caused great problems to subsequent processing, and the processing error often occurs. Therefore, a method for judging the magnetic orientation of the magnet is needed to enable the magnetic blank to be processed correctly according to the drawing requirements. SUMMARY

[0004] Therefore, the present application aims to provide a method, device and system for detecting the magnetic orientation of an uncharged magnetic blank to overcome the problem that the magnetic orientation of the neodymium iron boron blank cannot be effectively distinguished at present, which affects the subsequent processing procedure.

[0005] To achieve the above object, the present application adopts the following technical scheme:

[0006] In a first aspect, the present application provides a device for detecting the magnetic orientation of an uncharged magnetic blank, comprising: a magnetic field generating module, an inductance detection module and a magnetic orientation determining module.

[0007] The magnetic field generating module is configured to apply a varying magnetic field to the uncharged magnetic blank.

[0008] The inductance detection module is configured to obtain the inductance of different surfaces of the uncharged magnetic blank.

[0009] The magnetic orientation determining module is configured to send the inductance of different surfaces of the uncharged magnetic blank to a cloud server for magnetic orientation confirmation, and obtain the magnetic orientation of the uncharged magnetic blank.

[0010] Further, the device described above, the magnetic field generating module comprises a coil.

[0011] Further, the device described above, the inductance detection module comprises a bridge instrument and an inspection tool.

[0012] The bridge instrument is connected to the inspection tool.

[0013] Further, the above-mentioned device, the bridge instrument is adjusted to measure the inductance mode, the frequency is adjusted to 1KHZ, and the voltage is 600mV.

[0014] Further, the above-mentioned device, the non-magnetized blank is placed at the center of the inspection tool, and after waiting for 1-2 seconds, the measurement is started.

[0015] In a second aspect, the application provides a non-magnetized blank magnetic orientation detection method, which applies the non-magnetized blank magnetic orientation detection device, and includes:

[0016] A changing magnetic field is applied to the non-magnetized blank to generate eddy current in the non-magnetized blank, thereby generating inductance.

[0017] The inductance of different surfaces of the non-magnetized blank is obtained.

[0018] The inductance of different surfaces of the non-magnetized blank is sent to a cloud server for magnetic orientation confirmation, and the magnetic orientation of the non-magnetized blank is obtained.

[0019] Further, the above-mentioned method, the changing magnetic field is applied to the non-magnetized blank to generate eddy current in the non-magnetized blank, thereby generating inductance, includes:

[0020] The changing magnetic field is applied to the non-magnetized blank by a coil connected with high-frequency current, so as to generate eddy current in the non-magnetized blank, thereby generating inductance.

[0021] Further, the above-mentioned method, the inductance of different surfaces of the non-magnetized blank is sent to a cloud server for magnetic orientation confirmation, and the magnetic orientation of the non-magnetized blank is obtained, includes:

[0022] The inductance of different surfaces of the non-magnetized blank is compared.

[0023] The orientation of the surface with the maximum inductance of the non-magnetized blank is determined as the magnetic orientation of the non-magnetized blank.

[0024] In a third aspect, the application provides a non-magnetized blank magnetic orientation confirmation system, which includes:

[0025] The non-magnetized blank magnetic orientation detection device and the cloud server in communication connection with the non-magnetized blank magnetic orientation detection device.

[0026] The technical scheme provided in the application can include the following beneficial effects:

[0027] The technical scheme provided in the application first applies a changing magnetic field to the un-magnetized blank, so that eddy current is generated on the surface of the blank, because the magnetic permeability of different surfaces of the un-magnetized blank is different, the eddy current generated on different surfaces of the un-magnetized blank is different, so the inductance of different surfaces of the un-magnetized blank is different, the inductance of different surfaces of the un-magnetized blank is sent to the cloud server, the cloud server judges the magnetic orientation of the un-magnetized blank according to the inductance of different surfaces of the un-magnetized blank, and sends the judgment result to the un-magnetized blank magnetic orientation detection device, so that the magnetic orientation of the neodymium iron boron blank can be effectively distinguished, and the processing progress of the product can be accelerated. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0029] Figure 1 is a structure diagram provided by an embodiment of the un-magnetized blank magnetic orientation detection device of the present application;

[0030] Figure 2 is a flow chart provided by an embodiment of the un-magnetized blank magnetic orientation detection method of the present application;

[0031] Figure 3 is a basic principle diagram in the un-magnetized blank magnetic orientation detection method of the present application;

[0032] Figure 4 is an equivalent circuit diagram in the un-magnetized blank magnetic orientation detection method of the present application. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described in detail below. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0034] In the actual production process of neodymium iron boron magnets, distinguishing the orientation of neodymium iron boron magnets has always been a technical problem that has brought great trouble to actual production, especially for un-magnetized magnets, it is more difficult to judge the magnetic orientation of the magnets, which has brought great problems to the subsequent processing, and the processing error often occurs, so it is necessary to find a method to judge the magnetic orientation of the magnets, so that the magnet blank can be correctly processed according to the drawing requirements.

[0035] In view of this, the purpose of the present invention is to provide a method and device for detecting the magnetic orientation of unmagnetized blanks, so as to overcome the problem that the magnetic orientation of NdFeB blanks cannot be effectively distinguished, which affects subsequent processing steps.

[0036] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of an embodiment of the magnetic orientation detection device for unmagnetized blanks of the present invention, as shown below. Figure 1 As shown, the present invention provides a magnetic orientation detection device for an unmagnetized blank, comprising: a magnetic field generating module 1, an inductance detection module 2, and a magnetic orientation determination module;

[0037] Magnetic field generating module 1 is used to apply a changing magnetic field to an unmagnetized blank;

[0038] In some alternative embodiments, the magnetic field generating module 1 includes a coil that generates a changing magnetic field by applying a high-frequency current to the coil, thereby generating small eddy currents on the surface of the unmagnetized blank.

[0039] Inductance detection module 2 is used to obtain the inductance of different surfaces of the unmagnetized blank;

[0040] Specifically, when an unmagnetized blank is in a changing magnetic field, the permeability on different surfaces of the unmagnetized blank will vary greatly, resulting in different eddy currents generated in different orientations, which in turn leads to different measured inductances.

[0041] The magnetic orientation determination module is used to send the inductance of different surfaces of the unmagnetized blank to the cloud server for magnetic orientation confirmation, thereby obtaining the magnetic orientation of the unmagnetized blank.

[0042] Specifically, the magnetic orientation determination module sends the inductance of different surfaces of the unmagnetized blank detected by the inductance detection module 2 to the cloud server. The cloud server compares the magnitude of the inductance of different surfaces of the unmagnetized blank, determines the orientation of the surface with the largest inductance of the unmagnetized blank as the magnetic orientation of the unmagnetized blank, and sends the result to the unmagnetized blank magnetic orientation detection device.

[0043] In some optional embodiments, in order to better distinguish which surface of the unmagnetized blank each inductor corresponds to, the inductor detection module 2 will number the detected inductor data according to the detection order. For example, the first detected inductor data is numbered 1.

[0044] In some optional embodiments, the inductance detection module 2 includes a bridge instrument and an inspection fixture; the bridge instrument and the inspection fixture are connected. By adjusting the bridge instrument to the inductance measurement mode, setting the frequency to 1kHz and the voltage to 600mV, the unmagnetized blank to be tested is placed at the center of the inspection fixture, and the inductance of the surface of the unmagnetized blank is detected. When measuring with the bridge instrument, the higher the frequency and voltage set by the bridge instrument, the larger and more significant the measured value.

[0045] In some alternative embodiments, the coil is disposed inside the inspection fixture, enabling the detection of the inductance on the surface of the unmagnetized blank while applying a varying magnetic field to the blank.

[0046] When inspecting an unmagnetized blank, wait 1-2 seconds before measuring it. The reading on the bridge instrument will fluctuate and be unstable when the unmagnetized blank is first placed on the inspection fixture. The reading will stabilize after waiting 1-2 seconds.

[0047] First, a changing magnetic field is applied to the unmagnetized blank to generate eddy currents on its surface. Because the permeability of different surfaces of the unmagnetized blank is different, the eddy currents generated on different surfaces are also different, resulting in different inductances on different surfaces. The inductances of the different surfaces of the unmagnetized blank are sent to a cloud server. Based on the obtained inductances of the different surfaces of the unmagnetized blank, the cloud server determines the magnetic orientation of the unmagnetized blank and sends the determination result to the magnetic orientation detection equipment for the unmagnetized blank. This can effectively distinguish the magnetic orientation of NdFeB blanks and speed up the product processing.

[0048] This invention also provides a method for detecting the magnetic orientation of an unmagnetized blank, using the aforementioned unmagnetized blank magnetic orientation detection equipment. Figure 2 This is a flowchart provided in one embodiment of the magnetic orientation detection method for unmagnetized blanks of the present invention, as shown below. Figure 2 The method includes:

[0049] S11. Apply a changing magnetic field to the unmagnetized blank to generate eddy currents in the unmagnetized blank, thereby generating inductance.

[0050] Specifically, a changing magnetic field is applied to the unmagnetized blank by a coil connected to a high-frequency current, causing eddy currents to be generated in the unmagnetized blank, thereby generating inductance.

[0051] S12. Obtain the inductance of different surfaces of the unmagnetized blank.

[0052] Specifically, according to Figure 3 As shown, when a high-frequency current I1 flows through the coil, a continuously fluctuating magnetic field H1 is generated around the coil. In this fluctuating magnetic field, small eddy currents I2 are generated on the surface of the metal conductor. The new magnetic field H2 generated by I2, in turn, opposes the change in H1, which can be simplified as follows: Figure 4The equivalent circuit shown, according to Kirchhoff's voltage balance equation, yields the following equation:

[0053]

[0054] In the formula: I is the coil current, I1 is the induced current in the metal, J is an imaginary number, ω is the frequency of the excitation current in the coil; L is the equivalent inductance of the coil; R is the coil resistance; L1 is the equivalent inductance of the metal being measured; R1 is the equivalent resistance of the coil; M is the mutual inductance coefficient between L and L1; U is the excitation voltage.

[0055] Thus, the formula for equivalent inductance is obtained:

[0056]

[0057] Through the derivation of the above equation, the inductance can be simplified to:

[0058] L S = f(ω, μ, x, ρ)

[0059] In the formula: ω is the frequency of the excitation current in the coil; μ is the permeability of the measured object; ρ is the conductivity of the measured object; and x is the relative distance between the coil and the measured object.

[0060] By substituting the obtained parameters into the simplified inductance equation above, the inductance of different surfaces of the unmagnetized blank can be calculated.

[0061] S13. Send the inductance of different surfaces of the unmagnetized blank to the cloud server for magnetic orientation confirmation, and obtain the magnetic orientation of the unmagnetized blank.

[0062] Specifically, the inductance data from different surfaces of the unmagnetized blank are sent to the cloud server.

[0063] The cloud server compares the inductance of different surfaces of the unmagnetized blank;

[0064] The orientation of the surface with the largest inductance in the unmagnetized blank is determined as the magnetic orientation of the unmagnetized blank.

[0065] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0066] It should be noted that in the description of this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means at least two.

[0067] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0068] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0069] Those skilled in the art will understand that all or part of the steps of the methods described in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it includes one or a combination of the steps of the method embodiments.

[0070] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0071] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0072] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0073] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A magnetic orientation detection device for unmagnetized blanks, characterized in that, include: Magnetic field generation module, inductance detection module, and magnetic orientation determination module; The magnetic field generating module is used to apply a changing magnetic field to the unmagnetized blank; The inductance detection module is used to obtain the inductance of different surfaces of the unmagnetized blank; The magnetic orientation determination module is used to send the inductance of different surfaces of the unmagnetized blank to the cloud server, and the cloud server compares the inductance of different surfaces of the unmagnetized blank and determines the orientation of the surface with the largest inductance of the unmagnetized blank as the magnetic orientation of the unmagnetized blank, thereby obtaining the magnetic orientation of the unmagnetized blank.

2. The device according to claim 1, characterized in that, The magnetic field generating module includes a coil.

3. The device according to claim 1, characterized in that, The inductance detection module includes a bridge instrument and testing fixtures; The bridge instrument and the inspection fixture are connected.

4. The device according to claim 3, characterized in that, The bridge instrument was set to inductance measurement mode, with the frequency adjusted to 1kHz and the voltage set to 600mV.

5. The device according to claim 3, characterized in that, Place the unmagnetized blank in the center of the inspection fixture, wait 1-2 seconds, and then begin the measurement.

6. A method for detecting the magnetic orientation of an unmagnetized blank, using the magnetic orientation detection equipment for an unmagnetized blank as described in any one of claims 1-5, characterized in that, include: A changing magnetic field is applied to an unmagnetized blank, causing eddy currents to be generated in the blank, thereby producing inductance; Obtain the inductance of different surfaces of the unmagnetized blank; The inductances of different surfaces of the unmagnetized blank are sent to the cloud server, and the cloud server compares the inductances of different surfaces of the unmagnetized blank and determines the orientation of the surface with the largest inductance as the magnetic orientation of the unmagnetized blank, thereby obtaining the magnetic orientation of the unmagnetized blank.

7. The method according to claim 6, characterized in that, The method of applying a changing magnetic field to the unmagnetized blank to induce eddy currents in the blank, thereby generating inductance, includes: A changing magnetic field is applied to the unmagnetized blank by a coil connected to a high-frequency current, causing eddy currents to be generated in the unmagnetized blank, thereby generating inductance.

8. A magnetic orientation confirmation system for unmagnetized blanks, characterized in that, include: The magnetic orientation detection device for unmagnetized blanks according to any one of claims 1-5 and the cloud server that is communicatively connected to the magnetic orientation detection device for unmagnetized blanks.

Images