A method and apparatus for determining the orientation of magnetic materials

Abstract

This invention provides a method and apparatus for determining the orientation of magnetic materials. The method determines the orientation of the magnetic material by measuring the difference between the attractive force of the magnetic material and a reference value obtained from the orientation determination device; the orientation determination device includes a magnetized magnet. This method, by placing the magnetic material at an appropriate observation distance and judging the change in the difference between the attractive force value obtained from the orientation determination device and the reference value, enables orientation determination of magnetic materials in a non-magnetized state. This meets the transportation requirements in a non-magnetized state and ensures the production quality of magnetic products. The determination device used in this method is simple to construct and has low manufacturing cost, thus reducing the cost of orientation determination.

Description

Technical Field

[0001] This invention relates to the field of magnetic materials technology, and specifically to a method and apparatus for determining the orientation of magnetic materials. Background Technology

[0002] Most magnetic materials, including neodymium iron boron (NdFeB), have a specific orientation. Only after confirming this orientation can magnetization ensure the product's strongest magnetism. However, some customers require products to be transported in a non-magnetized state. Currently, there is no low-cost and effective method to confirm the orientation of magnetic materials in this non-magnetized state. During machining, the orientation must be strictly confirmed before processing. If the orientation cannot be confirmed in the non-magnetized state, it's impossible to reconfirm it during product inspection, meaning it's impossible to verify if the orientation was incorrectly cut during machining. This reduces the ability to ensure product quality and also causes inconvenience for customers.

[0003] Therefore, it is necessary to provide a method and apparatus for determining the orientation of magnetic materials in a non-magnetized state. Summary of the Invention

[0004] The purpose of this invention is to provide a method and apparatus for determining the orientation of magnetic materials. The method can determine the orientation of magnetic materials in a non-magnetized state, ensuring that the magnetic materials are non-magnetic after the orientation determination test at a low testing cost, thus improving the quality of magnetic products, and meeting the needs of transportation in a non-magnetized state.

[0005] The technical solution of the present invention is as follows:

[0006] A method for determining the orientation of magnetic materials, wherein the orientation of the magnetic material is determined by the difference between the attractive force of the magnetic material and a reference value of the attractive force by an orientation determination device; the orientation determination device includes a magnetized magnet.

[0007] Preferably, the method for calculating the attractive force reference value is F=k / d ∧ 2, where F is the reference value of the attractive force, k is the magnet coefficient, and d is the observation distance.

[0008] Preferably, the observation distance is the minimum distance at which the magnetized magnet will not cause the tested magnetic material to become magnetized.

[0009] The present invention also discloses a magnetic material orientation discrimination device for the above-mentioned magnetic material orientation discrimination method, which includes an attractive force test piece, a magnetized magnet connected to the attractive force test piece, and a support component for placing the magnetic material at the observation distance.

[0010] Preferably, the attractive force test piece is a tension gauge arranged in a vertical direction, and the magnetized magnet is located at the bottom end of the attractive force test piece.

[0011] Preferably, the magnetic material orientation discrimination device further includes a vertical mounting plate, the top of the attraction force test piece is connected to the vertical mounting plate, and the support component includes a first baffle and a second baffle vertically disposed on the vertical mounting plate. In the initial state, the magnetized magnet is disposed on the first baffle, and the magnetic material is disposed below the second baffle.

[0012] Preferably, the central axis of the magnetic material is coaxially arranged with the central axes of the attractive force test piece and the magnetized magnet. Preferably, the distance between the first baffle and the second baffle is the observation distance.

[0013] Preferably, the attractive force test piece is a balance, and the magnetized magnets are symmetrically arranged at both ends of the balance platform; the support component is a support platform located in the central area of ​​the balance platform, and the height of the support platform is the observation distance.

[0014] The beneficial effects of this invention are as follows: The magnetic material orientation discrimination method of this invention, by placing the magnetic material at an appropriate observation distance and judging the difference between the attractive force value obtained by the magnetic material orientation discrimination device and the attractive force reference value, realizes the orientation discrimination of the magnetic material in a non-magnetized state, which can meet the transportation needs in a non-magnetized state and ensure the production quality of magnetic products; the discrimination device used in the discrimination method is simple to construct and has low manufacturing cost, thereby reducing the cost of orientation discrimination. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the magnetic material orientation discrimination device described in Embodiment 1 of the present invention.

[0016] Figure 2 This is a schematic diagram of the magnetic material orientation discrimination device described in Embodiment 2 of the present invention. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Example 1:

[0019] This invention discloses a method for determining the orientation of magnetic materials. The orientation of a magnetic material is determined by the difference between the attractive force exerted by the magnetic material on it and a reference value. Specifically, an attractive force close to or equal to the reference value indicates the orientation direction of the magnetic material; conversely, an attractive force significantly less than the reference value indicates a non-orientation direction. The orientation determination device includes a magnetized magnet. This method, based on the principle that magnetic materials attract each other when close, uses a magnetized magnet to determine the orientation of magnetic materials such as neodymium iron boron (NdFeB) within a reasonable observation distance. The orientation direction of the magnetic material is determined by the magnitude of the attractive force exerted by the magnetized magnet when the magnetic material approaches it. The observation distance ensures that the determined magnetic material is not magnetized while the attractive force is observable, guaranteeing that the magnetic material is not magnetized during the orientation determination process.

[0020] The method for calculating the attractive force reference value is F=k / d. ∧ 2, where F is the reference value of the attractive force, k is the magnet coefficient, and d is the observation distance. The observation distance is the minimum distance at which the magnetized magnet will not magnetize the tested magnetic material. The observation distance is obtained by testing the magnetism of the tested magnetic material using a fluxmeter at different distances between the magnetized magnet and the tested magnetic material. If the fluxmeter does not display anything during the test, it indicates that the tested magnetic material is not magnetized. The observation distance is obtained when the fluxmeter does not display anything and the distance between the magnetized magnet and the tested magnetic material is minimized.

[0021] This invention also discloses a magnetic material orientation discrimination device for the aforementioned magnetic material orientation discrimination method, comprising an attractive force test element 1, a magnetized magnet 2 connected to the attractive force test element 1, and a support component 3 for placing the magnetic material at an observation distance. The magnetic material orientation discrimination device of this invention combines the attractive force test element 1 and the magnetized magnet 2. The attractive force test element 1 visually displays the attractive force of the magnetized magnet 2 on the magnetic material, thereby allowing the orientation direction of the magnetic material to be determined. The overall structure is simple and readily available, the operating principle is convenient, and the discrimination cost is low.

[0022] like Figure 1 As shown, in some embodiments, the attractive force test piece 1 is a tension gauge arranged in a vertical direction, and the magnetized magnet 2 is located at the bottom end of the attractive force test piece 1.

[0023] The magnetic material orientation discrimination device further includes a vertical mounting plate 4. The top of the attraction force test piece 1 is connected to the vertical mounting plate 4. The support component 3 includes a first baffle 31 and a second baffle 32 vertically mounted on the vertical mounting plate 4. The magnetized magnet 2 is disposed on the first baffle 31, and the magnetic material is disposed below the second baffle 32. In use, the central axis of the magnetic material is coaxially arranged with the central axes of the attraction force test piece 1 and the magnetized magnet 2. The attraction force test piece 1 is pulled to record the value when the magnetized magnet 2 leaves the first baffle 31. Tests are performed on different directions of the same magnetic material, and the orientation direction of the magnetic material can be determined by comparing the numerical values. The numerical discrimination can be based on the attraction force when the orientation is uniform, so as to avoid residual magnetism in the tested magnetic material after measurement and improve the testing efficiency. In some embodiments, the attraction force test piece 1 is a spring tension gauge. In the initial state, the magnetized magnet 2 is located at the natural extension of the tension gauge spring, and the first baffle 31 abuts against the magnetized magnet 2.

[0024] The distance between the first baffle 31 and the second baffle 32 is the observation distance.

[0025] Example 2:

[0026] This invention provides another magnetic material orientation discrimination device for the above-described magnetic material orientation discrimination method, such as... Figure 2 As shown in the embodiment of the invention, the attractive force test piece 1 is a balance, and the magnetized magnets 2 are symmetrically arranged at both ends of the balance platform; the support component 3 is a support platform located in the central area of ​​the balance platform, and the height of the support platform is the observation distance. In use, the specific testing steps include: recording the initial value of the balance when the magnetized magnets 2 and the support component 3 are loaded; then placing the magnetic material to be tested on the support platform; changing the opposite face of the magnetic material to the support platform to test different faces of the same magnetic material and recording the test values; the face corresponding to the largest change in value relative to the initial value is the orientation direction of the magnetic material to be tested; the central axis of the magnetic material is correspondingly set to the central axis of the support platform; the support platform can be a plastic platform. Similarly, the numerical discrimination criterion can be based on the attractive force when uniformly oriented, to avoid residual magnetism in the magnetic material after measurement and to improve testing efficiency.

[0027] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A method for determining the orientation of magnetic materials, characterized in that, The orientation of a magnetic material is determined by the difference between the attractive force of the magnetic material and a reference value of the attractive force, using an orientation determination device. The orientation determination device includes a magnetized magnet. The reference value of the attractive force is calculated as F = k / d. ∧ 2, where F is the reference value of the attractive force, k is the magnet coefficient, and d is the observation distance; the observation distance is the minimum distance at which the magnetized magnet will not cause the tested magnetic material to become magnetized.

2. A magnetic material orientation discrimination device, used in the magnetic material orientation discrimination method of claim 1, characterized in that: It includes an attractive force test piece, a magnetized magnet connected to the attractive force test piece, and a support component for placing magnetic material at the observation distance.

3. The magnetic material orientation discrimination device according to claim 2, characterized in that: The attractive force test piece is a tension gauge arranged in a vertical direction, and the magnetized magnet is located at the bottom end of the attractive force test piece.

4. The magnetic material orientation discrimination device according to claim 3, characterized in that: The magnetic material orientation discrimination device further includes a vertical mounting plate. The top of the attraction force test piece is connected to the vertical mounting plate. The support component includes a first baffle and a second baffle vertically disposed on the vertical mounting plate. In the initial state, the magnetized magnet is disposed on the first baffle, and the magnetic material is disposed below the second baffle.

5. The magnetic material orientation discrimination device according to claim 4, characterized in that: The central axis of the magnetic material is coaxial with the central axis of the attractive force test piece and the magnetized magnet.

6. The magnetic material orientation discrimination device according to claim 4, characterized in that: The distance between the first baffle and the second baffle is the observation distance.

7. The magnetic material orientation discrimination device according to claim 2, characterized in that: The attractive force test piece is a balance, and the magnetized magnets are symmetrically arranged at both ends of the balance platform; the support component is a support platform located in the central area of ​​the balance platform, and the height of the support platform is the observation distance.

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