A preparation device and preparation method for anisotropic bonded rare earth permanent magnet powder magnetic property test sample

Abstract

The present invention relates to the technical field of preparing rare earth permanent magnet material test samples, and in particular to a preparation device and method for anisotropic bonded rare earth permanent magnet powder magnetic property test samples. The present invention uses a cylindrical through-hole mold set on a sample plate as a mold for the magnetic property test sample of anisotropic bonded rare earth permanent magnet powder. By controlling the diameter of the cylindrical through-hole mold to be smaller than the end face diameters of the first pole head and the second pole head, it can be ensured that the anisotropic bonded rare earth permanent magnet powder falls into the magnetic field. During preparation, the sample plate is placed between the first pole head and the second pole head, and a closed magnetic circuit is formed between the first pole head, the first pole column, the first magnetic steel plate, the permanent magnet, the second magnetic steel plate, the second pole column, the second pole head and the powder in the sample plate. Under the action of the magnetic field, the orientation molding of the anisotropic bonded rare earth permanent magnet powder is realized, thereby realizing the sample preparation of the anisotropic bonded rare earth permanent magnet powder.

Description

Technical Field

[0001] The invention relates to the technical field of preparing rare earth permanent magnet material test samples, and in particular to a preparation device and a preparation method for anisotropic bonded rare earth permanent magnet powder magnetic property test samples. Background Art

[0002] Anisotropic bonded rare earth permanent magnet materials have important applications in industrial production, and the evaluation of their powder magnetic properties is an important part of material development. Vibrating sample magnetometer (VSM) has the characteristics of high sensitivity, high test accuracy and fast test speed. It is an excellent technical means to evaluate the magnetic property parameters of powders such as intrinsic coercivity, saturation magnetization, residual magnetization and maximum magnetic energy product.

[0003] The powder sample needs to be made into a block sample of a certain shape, and then fixed on the sample rod of the vibrating sample magnetometer (VSM), and a measuring magnetic field is applied to test the hysteresis loop. In order to prevent the powder particles from rotating with the external reverse magnetic field during the test, affecting the test accuracy of its intrinsic coercive force, the powder needs to be compacted during the sample preparation process, or the powder needs to be mixed with a certain proportion of a binder for fixation. Before the magnetic properties of anisotropic bonded rare earth permanent magnet materials are tested, in order to achieve the anisotropy of the permanent magnet material, the powder must be oriented and formed along the magnetic field direction in the external magnetic field.

[0004] At present, the preparation of anisotropic bonded rare earth permanent magnetic material samples mainly involves adding solid paraffin to the anisotropic powder, then heating it, and then putting the heated mixture into a plastic tube, and placing the plastic tube in a magnetic field for orientation sample preparation. However, this method is complicated to operate, and heating of rare earth magnetic powder is prone to cause magnetic performance loss. Therefore, it is urgent to provide an effective sample preparation device and method for anisotropic permanent magnetic powder to simplify the preparation process and reduce magnetic performance loss. Summary of the invention

[0005] The purpose of the present invention is to provide a preparation device and a preparation method for a magnetic property test sample of anisotropic bonded rare earth permanent magnet powder. The preparation device and the preparation method are suitable for sample preparation of anisotropic bonded rare earth permanent magnet powder, are easy to operate, do not require heating, and can avoid magnetic property loss caused by the preparation process. The preparation device and the preparation method are effective means for evaluating the magnetic properties of anisotropic bonded rare earth permanent magnet powder.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a preparation device for anisotropic bonded rare earth permanent magnetic powder magnetic property test sample, comprising: a first pole head 1, a first pole column 2, a first magnetic conductive steel plate 3, a permanent magnet 4, a second magnetic conductive steel plate 5, a second pole column 9, a second pole head 10 and a sample plate 11;

[0008] One end of the first pole 2 is connected to one end of the first pole head 1, and the other end is connected to the upper part of the first magnetic conductive steel plate 3;

[0009] The lower part of the first magnetic steel plate 3 is connected to one end of the permanent magnet 4;

[0010] The other end of the permanent magnet 4 is connected to the lower part of the second magnetic conductive steel plate 5;

[0011] The upper portion of the second magnetic conductive steel plate 5 is connected to one end of the second pole 9;

[0012] The other end of the second pole 9 is connected to the second pole head 10;

[0013] The sample plate 11 is provided with a cylindrical through-hole mold 12; the sample plate 11 is detachably arranged between the first pole head 1 and the second pole head 10; the diameter of the cylindrical through-hole mold 12 is smaller than the end surface diameters of the first pole head 1 and the second pole head 10; the material of the sample plate 11 is a non-magnetic material;

[0014] The axes of the first pole head 1, the first pole column 2, the second pole column 9 and the second pole head 10 coincide with each other; the first pole head 1, the first pole column 2, the second pole column 9 and the second pole head 10 are made of magnetic conductive material;

[0015] A magnetic circuit is formed between the first pole head 1 , the first pole column 2 , the first magnetic conductive steel plate 3 , the permanent magnet 4 , the second magnetic conductive steel plate 5 , the second pole column 9 and the second pole head 10 .

[0016] Preferably, the first pole head 1 and the second pole head 10 are both conical pole heads with a contraction half angle of 60°.

[0017] Preferably, the large end of the first pole 1 is connected to the first pole 2 as a whole; the large end of the second pole 10 is connected to the second pole 9 as a whole.

[0018] Preferably, the diameter of the cylindrical through-hole mold 12 is 3-5 mm, and the aspect ratio is 1.

[0019] Preferably, the first pole head 1 , the first pole column 2 , the second pole column 9 and the second pole head 10 are independently made of electrical pure iron or Fe—Co alloy.

[0020] Preferably, it further comprises a tightening nut 6, a tightening rod 7 and an optical axis fixing ring 8; the tightening rod 7 is fixedly connected to the tightening nut 6 and is used to rotate the tightening nut 6;

[0021] A thread is provided at one end of the second pole 9 away from the second pole head 10, and the second pole 9 passes through the second magnetic steel plate 5 and the optical axis fixing ring 8 in sequence and is connected to the tightening nut 6 by thread, and the first pole 2 is fixedly connected to the first magnetic steel plate 3; or a thread is provided at one end of the first pole 2 away from the first pole head 1, and the first pole 2 passes through the first magnetic steel plate 3 and the optical axis fixing ring 8 in sequence and is connected to the tightening nut 6 by thread, and the second pole 9 is fixedly connected to the second magnetic steel plate 5.

[0022] Preferably, the optical axis fixing ring 8 is made of non-magnetic material.

[0023] The present invention provides a method for preparing a sample for testing magnetic properties of anisotropic bonded rare earth permanent magnet powder, which is prepared by using the preparation device described in the above scheme. The preparation method comprises the following steps:

[0024] The anisotropic bonded rare earth permanent magnet powder and a binder are mixed to obtain a mixture; the binder has a curing time of 2 to 3 hours;

[0025] The mixture is filled in the cylindrical through-hole mold 12, and then the sample plate filled with the mixture is placed between the first pole head 1 and the second pole head 10, so that the first pole head 1, the cylindrical through-hole mold filled with the mixture and the second pole head 10 are tightly fitted, and a closed magnetic circuit is formed between the first pole head 1, the first pole 2, the first magnetic steel plate 3, the permanent magnet 4, the second magnetic steel plate 5, the second pole 9, the second pole head 10 and the mixture in the sample plate 11 to achieve the orientation of the anisotropic bonded rare earth permanent magnet powder. After curing, an anisotropic bonded rare earth permanent magnet powder magnetic property test sample is formed in the cylindrical through-hole mold.

[0026] Preferably, the content of anisotropic bonded rare earth permanent magnet powder in the mixture is 30-80wt%.

[0027] Preferably, the adhesive comprises AB adhesive.

[0028] The present invention provides a preparation device for anisotropic bonded rare earth permanent magnetic powder magnetic property test sample, comprising: a first pole head 1, a first pole column 2, a first magnetic conductive steel plate 3, a permanent magnet 4, a second magnetic conductive steel plate 5, a second pole column 9, a second pole head 10 and a sample plate 11; one end of the first pole column 2 is connected to one end of the first pole head 1, and the other end is connected to the upper part of the first magnetic conductive steel plate 3; the lower part of the first magnetic conductive steel plate 3 is connected to one end of the permanent magnet 4; the other end of the permanent magnet 4 is connected to the lower part of the second magnetic conductive steel plate 5; the upper part of the second magnetic conductive steel plate 5 is connected to one end of the second pole column 9; the other end of the second pole column 9 is connected to the second pole head 1 0 connection; the sample plate 11 is provided with a cylindrical through-hole mold 12; the sample plate 11 is detachably arranged between the first pole head 1 and the second pole head 10; the diameter of the cylindrical through-hole mold 12 is smaller than the end face diameter of the first pole head 1 and the second pole head 10; the material of the sample plate 11 is non-magnetic material; the axes of the first pole head 1, the first pole column 2, the second pole column 9 and the second pole head 10 coincide; the material of the first pole head 1, the first pole column 2, the second pole column 9 and the second pole head 10 is magnetic material; a magnetic circuit is formed between the first pole head 1, the first pole column 2, the first magnetic steel plate 3, the permanent magnet 4, the second magnetic steel plate 5, the second pole column 9 and the second pole head 10.

[0029] The present invention uses a cylindrical through-hole mold 12 set on a sample plate 11 as a mold for testing the magnetic properties of anisotropic bonded rare earth permanent magnet powder samples. By controlling the diameter of the cylindrical through-hole mold 12 to be smaller than the end face diameters of the first pole head 1 and the second pole head 10, it can be ensured that the anisotropic bonded rare earth permanent magnet powder falls into the magnetic field. During preparation, the sample plate 11 is placed between the first pole head 1 and the second pole head 10 and is closely fitted with the first pole head 1 and the second pole head 10. A closed magnetic circuit is formed between the first pole head 1, the first pole column 2, the first magnetic steel plate 3, the permanent magnet 4, the second magnetic steel plate 5, the second pole column 9, the second pole head 10 and the powder in the sample plate 11. Under the action of the magnetic field, the orientation molding of the anisotropic bonded rare earth permanent magnet powder is achieved, thereby achieving the sample preparation of the anisotropic bonded rare earth permanent magnet powder. The sample of the anisotropic bonded rare earth permanent magnet powder is prepared by the device of the present invention, which is easy to operate, does not require heating, and can avoid magnetic performance loss caused by the preparation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the preparation device of the present invention;

[0031] Figure 2 is a schematic diagram of the structure of the second pole and the second pole;

[0032] Figure 3 It is a top view of the optical axis fixing ring;

[0033] Figure 4 is a schematic diagram of the structure of the sample plate;

[0034] Among them, 1-first pole head, 2-first pole column, 3-first magnetic conductive steel plate, 4-permanent magnet, 5-second magnetic conductive steel plate, 6-tightening nut, 7-fastening rod, 8-optical axis fixing ring, 9-second pole column, 10-second pole head, 11-sample plate, 12-cylindrical through hole mold. DETAILED DESCRIPTION

[0035] The present invention provides a preparation device for anisotropic bonded rare earth permanent magnetic powder magnetic property test sample, comprising: a first pole head 1, a first pole column 2, a first magnetic conductive steel plate 3, a permanent magnet 4, a second magnetic conductive steel plate 5, a second pole column 9, a second pole head 10 and a sample plate 11;

[0036] One end of the first pole 2 is connected to one end of the first pole head 1, and the other end is connected to the upper part of the first magnetic conductive steel plate 3;

[0037] The lower part of the first magnetic steel plate 3 is connected to one end of the permanent magnet 4;

[0038] The other end of the permanent magnet 4 is connected to the lower part of the second magnetic conductive steel plate 5;

[0039] The upper portion of the second magnetic conductive steel plate 5 is connected to one end of the second pole 9;

[0040] The other end of the second pole 9 is connected to the second pole head 10;

[0041] The sample plate 11 is provided with a cylindrical through-hole mold 12; the sample plate 11 is detachably arranged between the first pole head 1 and the second pole head 10; the diameter of the cylindrical through-hole mold 12 is smaller than the end surface diameters of the first pole head 1 and the second pole head 10; the material of the sample plate 11 is a non-magnetic material;

[0042] The axes of the first pole head 1, the first pole column 2, the second pole column 9 and the second pole head 10 coincide; the material of the first pole head 1, the first pole column 2, the second pole column 9 and the second pole head 10 is magnetic conductive material; a magnetic circuit is formed between the first pole head 1, the first pole column 2, the first magnetic conductive steel plate 3, the permanent magnet 4, the second magnetic conductive steel plate 5, the second pole column 9 and the second pole head 10.

[0043] like Figure 1As shown, the preparation device provided by the present invention includes a first pole head 1 and a second pole head 10. In an embodiment of the present invention, the first pole head and the second pole head are preferably conical pole heads, and the contraction half angle is preferably 60°. The present invention adopts conical pole heads, which is conducive to the concentration of magnetic lines of force, can reduce magnetic leakage, and increase the magnetic field between the pole heads. In the present invention, the material of the first pole head and the second pole head is preferably a magnetic conductive material, and independently preferably electrical pure iron or Fe-Co alloy. The present invention has no special requirements on the size of the first pole head and the second pole head, as long as the concentration of magnetic lines of force can be achieved. In an embodiment of the present invention, the contraction half angle of the first pole head and the second pole head is preferably 60°, and the length is preferably 7 mm. In the present invention, the axes of the first pole head and the second pole head coincide.

[0044] The preparation device provided by the present invention includes a first pole 2, one end of which is connected to one end of the first pole head 1, specifically to the large end of the first pole head. In an embodiment of the present invention, the first pole 2 is connected to the first pole head 1 as a whole. In the present invention, the material of the first pole is preferably a magnetic conductive material, preferably having the same applicable range as the material of the first pole head, which will not be repeated here. The present invention has no special requirements for the size of the first pole, as long as it can cooperate with other components to form a magnetic circuit. In an embodiment of the present invention, the size of the first pole is preferably Φ40*50mm.

[0045] The preparation device provided by the present invention includes a first magnetic conductive steel plate 3 connected to the other end of the first pole 2, and the first pole 2 is specifically connected to the upper part of the first magnetic conductive steel plate 3. In an embodiment of the present invention, a groove is provided on the upper part of the first magnetic conductive steel plate 3, and the first pole 2 is inserted into the groove of the first magnetic conductive steel plate 3, so as to realize the connection between the two. The present invention has no special requirements for the depth of the groove, and it is sufficient to realize the firm connection between the first magnetic conductive steel plate 3 and the first pole 2. In the present invention, the function of the first magnetic conductive steel plate 3 is magnetic conductivity. The present invention has no special requirements for the material of the first magnetic conductive steel plate 3, and any magnetic conductive steel known in the art can be used. The present invention has no special requirements for the size of the first magnetic conductive steel plate 3, as long as it can cooperate with other components to form a magnetic circuit. In an embodiment of the present invention, the size of the first magnetic conductive steel plate is 750mm*230mm*20mm; the axial position of the first pole is located at a position 170mm high in the vertical direction and centered in the horizontal direction of the first magnetic conductive steel plate.

[0046] The preparation device provided by the present invention comprises a permanent magnet 4, and the two ends of the permanent magnet 4 are respectively connected to the lower part of the first magnetic steel plate 3 and the lower part of the second magnetic steel plate 5. In an embodiment of the present invention, the bottom edge of the permanent magnet 4 is on the same line as the bottom edges of the second magnetic steel plate 5 and the first magnetic steel plate 3. The present invention has no special requirements for the connection mode of the permanent magnet 4 and the first magnetic steel plate 3 and the connection mode of the permanent magnet 4 and the second magnetic steel plate 5, and it is sufficient to ensure that the two are tightly connected. In an embodiment of the present invention, the permanent magnet 4 and the first magnetic steel plate 3 and the permanent magnet 4 and the second magnetic steel plate 5 are connected by an adhesive, and the adhesive is preferably an epoxy resin adhesive. In the present invention, the material of the permanent magnet 4 is preferably NdFeB rare earth magnet. In the present invention, the function of the permanent magnet 4 is to provide an orientation magnetic field. In an embodiment of the present invention, the size of the permanent magnet 4 is 750mm*120mm*80mm.

[0047] The preparation device provided by the present invention includes a second magnetic conductive steel plate 5, and the function of the second magnetic conductive steel plate 5 is to conduct magnetism. The present invention has no special requirements on the material of the second magnetic conductive steel plate 5, and any magnetic conductive steel known in the art can be used. The present invention has no special requirements on the size of the second magnetic conductive steel plate 5, as long as it can cooperate with other components to form a magnetic circuit. In an embodiment of the present invention, the size of the second magnetic conductive steel plate is 750mm*230mm*20mm; the second magnetic conductive steel plate 5 and the first magnetic conductive steel plate 3 are symmetrically arranged with respect to the permanent magnet.

[0048] The preparation device provided by the present invention includes a second pole 9. In the present invention, one end of the second pole 9 is connected to the upper part of the second magnetic steel plate 5, and the other end is connected to the second pole head 10. In an embodiment of the present invention, the second pole 9 is connected to the second pole head 10 as a whole, specifically connected to the large end of the second pole head 10; the upper part of the second magnetic steel plate 5 is provided with a groove, and the second pole 9 is inserted into the groove of the second magnetic steel plate 5, so as to achieve the connection between the two. The present invention has no special requirements for the depth of the groove, and it is sufficient to achieve a firm connection between the second magnetic steel plate 5 and the second pole 9. In the present invention, the material of the second pole has the same applicable range as the material of the first pole, and it will not be repeated here. The present invention has no special requirements for the size of the second pole, as long as it can cooperate with other components to form a magnetic circuit. In an embodiment of the present invention, the size of the second pole is Φ40*50mm.

[0049] The preparation device provided by the present invention includes a sample plate 11, and the sample plate 11 is provided with a cylindrical through-hole mold 12; the sample plate 11 is detachably arranged between the first pole head 1 and the second pole head 10; the diameter of the cylindrical through-hole mold 12 is smaller than the end face diameter of the first pole head 1 and the second pole head 10. In the present invention, the cylindrical through-hole mold 12 is used as a mold for the magnetic property test sample of the anisotropic bonded rare earth permanent magnet powder. By controlling the diameter of the cylindrical through-hole mold 12 to be smaller than the end face diameter of the first pole head 1 and the second pole head 10, it can be ensured that the anisotropic bonded rare earth permanent magnet powder falls into the magnetic field completely. In an embodiment of the present invention, the diameter of the cylindrical through-hole mold 12 is 3 to 5 mm, and the aspect ratio is 1. In the present invention, the number of cylindrical through-hole molds 12 arranged on the sample plate 11 is preferably 1 to 3, and more preferably 2; when the number of the cylindrical through-hole molds 12 is 2, specifically as follows Figure 4 As shown, in Figure 4 The cylindrical through hole mold 12 - 1 and the cylindrical through hole mold 12 - 2 are shown in the figure. The present invention has no special requirements on the location of the cylindrical through hole mold 12 , and it is preferably located in the central area of ​​the sample plate 11 .

[0050] In the present invention, the material of the sample plate 11 is a non-magnetic material. The sample plate 11 of the present invention is a non-magnetic material, which can ensure that after the anisotropic bonded rare earth permanent magnet powder is placed in the cylindrical through-hole mold 12 in the sample plate 11, a closed magnetic circuit is formed between the first pole head 1, the first pole column 2, the first magnetic steel plate 3, the permanent magnet 4, the second magnetic steel plate 5, the second pole column 9, the second pole head 10 and the anisotropic bonded rare earth permanent magnet powder in the sample plate 11. The present invention has no special requirements for the size of the sample plate 11, as long as it can meet the installation and fixing requirements. In an embodiment of the present invention, the shape of the sample plate 11 is "T" shaped, such as Figure 4 In the embodiment of the present invention, the size of the sample plate 11 is 140*80mm*3mm, and the size of the "T"-shaped protruding portion is 20*20mm. The present invention sets the sample plate 11 in a "T" shape to facilitate the positioning and installation of the sample plate.

[0051] In the present invention, the sample plate 11 can be removed and placed separately when not in use, or can be fixed between the first pole head and the second pole head. In the present invention, when installed, it is placed in a "T" shape with a 90° rotation, with the large end on the outside. Figure 4 The A angle in the Figure 1The lower middle dotted line shows that the cylindrical through-hole mold 12-1 falls into the two-pole magnetic field area. To improve the utilization rate of the sample plate, the sample plate can be rotated 180° with the horizontal line as the axis based on this position, and the cylindrical through-hole mold 12-2 is used for sample preparation. The holes of the cylindrical through-hole mold 12-1 and the cylindrical through-hole mold 12-2 can be used alternately. When both holes are worn out and fail, another sample plate needs to be processed.

[0052] In the present invention, when preparing the test sample, the anisotropic bonded rare earth permanent magnet powder is filled into the cylindrical through-hole mold 12 of the sample plate 11, and then the sample plate 11 is placed between the first pole head 1 and the second pole head 10 so that the sample plate 11 is closely fitted with the first pole head 1 and the second pole head 10, and a closed magnetic circuit is formed between the first pole head 1, the first pole column 2, the first magnetic steel plate 3, the permanent magnet 4, the second magnetic steel plate 5, the second pole column 9, the second pole head 10 and the anisotropic bonded rare earth permanent magnet powder in the sample plate 11. Figure 1 The direction of the arrow in is the direction of the magnetic circuit. Under the action of the magnetic field, the oriented molding of the anisotropic bonded rare earth permanent magnet powder is achieved, thereby realizing the sample preparation of the anisotropic bonded rare earth permanent magnet powder.

[0053] As an embodiment of the present invention, the preparation device provided by the present invention also includes a tightening nut 6, a tightening rod 7 and an optical axis fixing ring 8; the tightening rod 7 is fixedly connected to the tightening nut 6 for rotating the tightening nut 6; the fixed connection is specifically a welding connection; the tightening nut 6, the tightening rod 7 and the optical axis fixing ring 8 cooperate with the second pole 9 or cooperate with the first pole 2, thereby realizing the adjustment of the distance between the first pole head and the second pole head to facilitate the installation and disassembly of the device.

[0054] When the tightening nut 6, the tightening rod 7 and the optical axis fixing ring 8 cooperate with the second pole 9, the second pole 9 is composed of an optical axis section and a threaded section, and the threaded section is located at the end away from the second pole head 10; the two side surfaces of the optical axis section are processed into planes; the specific structure is as follows Figure 2 As shown. The present invention processes the two side surfaces of the optical axis segment into planes, which can prevent it from rotating rather than moving axially during the process of adjusting the tightening nut 6, thereby achieving the adjustment of the distance between the first pole head and the second pole head. In an embodiment of the present invention, the length of the threaded segment is 1 / 3 of the length of the second pole. In an embodiment of the present invention, the second pole 9 passes through the second magnetic steel plate 5 and the optical axis fixing ring 8 in sequence, and the optical axis fixing ring 8 is sleeved on the optical axis of the second pole 9. The inner hole of the optical axis fixing ring 8 matches the optical axis of the second pole 9, and the two are tightly connected. The optical axis fixing ring 8 is also tightly connected to the second magnetic steel plate 5. The schematic diagram is shown in the attached Figure 3. In the present invention, the optical axis fixing ring 8 is used to fix the second pole to ensure that it moves axially during the adjustment of the tightening nut 6, thereby realizing the adjustment of the distance between the first pole head and the second pole head. In the present invention, the threaded section of the second pole 9 is threadedly connected to the tightening nut 6, and the distance between the second pole head 10 and the first pole head 1 can be adjusted by adjusting the tightening nut 6. In the present invention, when the tightening nut 6, the fastening rod 7 and the optical axis fixing ring 8 cooperate to act on the second pole 9, the first pole 2 and the first magnetic steel plate 3 are fixedly connected, specifically, the first pole 2 is inserted into the groove of the first magnetic steel plate 3 to realize the connection between the two.

[0055] When the tightening nut 6, the fastening rod 7 and the optical axis fixing ring 8 cooperate to act on the first pole 2, the corresponding structural features and connection relationship are the same as the scheme acting on the second pole 9, and it is only necessary to replace the second pole 9 with the first pole 2, and replace the second magnetic conductive steel plate 5 with the first magnetic conductive steel plate 3, which will not be repeated here. In the present invention, when the tightening nut 6, the fastening rod 7 and the optical axis fixing ring 8 cooperate to act on the first pole 2, the second pole 9 is fixedly connected to the second magnetic conductive steel plate 5, specifically, the second pole 9 is inserted into the groove of the second magnetic conductive steel plate 5 to achieve the connection between the two.

[0056] The present invention provides a method for preparing a sample for testing magnetic properties of anisotropic bonded rare earth permanent magnet powder, which is prepared by using the preparation device described in the above scheme. The preparation method comprises the following steps:

[0057] The anisotropic bonded rare earth permanent magnet powder and a binder are mixed to obtain a mixture; the binder has a curing time of 2 to 3 hours;

[0058] The mixture is filled in the cylindrical through-hole mold 12 of the sample plate 11, and then the sample plate filled with the mixture is placed between the first pole head 1 and the second pole head 10, so that the first pole head 1, the cylindrical through-hole mold filled with the mixture and the second pole head 10 are tightly fitted, and a closed magnetic circuit is formed between the first pole head 1, the first pole 2, the first magnetic steel plate 3, the permanent magnet 4, the second magnetic steel plate 5, the second pole 9, the second pole head 10 and the mixture in the sample plate 11 to achieve the orientation of the anisotropic bonded rare earth permanent magnet powder. After curing, an anisotropic bonded rare earth permanent magnet powder magnetic property test sample is formed in the cylindrical through-hole mold.

[0059] The present invention mixes anisotropic bonded rare earth permanent magnet powder and a binder to obtain a mixture. The present invention has no special requirements for the type of the anisotropic bonded rare earth permanent magnet powder, and any anisotropic bonded rare earth permanent magnet powder that needs to be tested for magnetic properties can be used. In the present invention, the binder uses a binder with a curing time of 2 to 3 hours, which can be specifically but not limited to AB adhesive. The curing time of the binder of the present invention is suitable, which can not only meet the orientation requirements, but also improve the sample preparation efficiency. If the curing time of the adhesive is too short, it is easy to appear that the unoriented has been cured, resulting in sample preparation failure. The present invention has no special requirements for the mixing method, and any method that can evenly mix the anisotropic bonded rare earth permanent magnet powder and the binder can be used. In the present invention, the content of the anisotropic bonded rare earth permanent magnet powder in the mixed powder is preferably 30 to 80wt%, more preferably 40 to 70wt%, and further preferably 50 to 60wt%.

[0060] After obtaining the mixture, the present invention fills the mixture into the cylindrical through-hole mold 12 of the sample plate 11, and then places the sample plate filled with the mixture between the first pole head 1 and the second pole head 10, so that the first pole head 1, the cylindrical through-hole mold filled with the mixture and the second pole head 10 are tightly fitted, and a closed magnetic circuit is formed between the first pole head 1, the first pole 2, the first magnetic steel plate 3, the permanent magnet 4, the second magnetic steel plate 5, the second pole 9, the second pole head 10 and the mixture in the sample plate 11, so as to realize the orientation of the anisotropic bonded rare earth permanent magnet powder. After curing, a magnetic property test sample of the anisotropic bonded rare earth permanent magnet powder is formed in the cylindrical through-hole mold.

[0061] The present invention has no special requirements for the filling method, and the cylindrical through-hole mold can be completely filled. The present invention preferably adjusts the distance between the first pole head and the second pole head by adjusting the tightening nut 6, so that the first pole head 1, the cylindrical through-hole mold filled with the mixture and the second pole head 10 fit closely. The present invention preferably makes the right angle A of the sample plate 11 fit closely with the upper end of the outer side of the permanent magnet to ensure that the sample is in the magnetic field.

[0062] In the present invention, the curing method is preferably to stand still. The present invention has no special requirements for the curing time, which is controlled according to the type of binder. The mixture of the present invention can complete the orientation arrangement along the external magnetic field in a very short time, and the curing time of the binder is 2 to 3 hours. It is a process of orientation first and then curing. The orientation and curing are completed in the magnetic field, so the curing will not be completed during the application of the magnetic field. After curing, an anisotropic bonded rare earth permanent magnet powder magnetic property test sample is formed in the cylindrical through-hole mold and can be taken out.

[0063] The following is a detailed description of the device and method for preparing the anisotropic bonded rare earth permanent magnet powder magnetic property test sample provided by the present invention in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0064] Example 1

[0065] The devices used are as Figure 1 As shown, the first pole head 1 is integrally connected to the first pole column 2, the second pole head 10 is integrally connected to the second pole column 9, the first pole head 1 and the second pole head 2 are conical pole heads, the contraction half angle is 60°, the length is 7mm, the size of the small head end is Φ16mm, and the size of the large head end is Φ40mm; the first pole head, the second pole head, the first pole column and the second pole column are all made of electrical pure iron; the size of the high-performance permanent magnet 4 is 750mm*120mm*80mm, and the material is NdFeB rare earth magnet; the size of the first magnetic steel plate 3 and the second magnetic steel plate 5 is 750m m*230mm*20mm; the first pole 2 has a size of Φ40*50mm, the second pole 10 is adjustable and has a size of Φ40*120mm; the optical axis fixing ring 8 has an external size of Φ80*35mm, its inner hole size is Φ40*36*50mm, and the tightening nut 6 has a size of Φ50*30*20mm; the size of the cylindrical through hole mold of the sample plate 11 is Φ3*3mm, the material of the sample plate 11 is PP plastic, the shape is T-shaped, the size is 140*80mm*3mm, and the size of the "T"-shaped protruding part is 20*20mm.

[0066] The preparation method is as follows:

[0067] Mix 50 g of anisotropic bonded rare earth permanent magnet powder and 50 g of a binder (AB adhesive) to obtain a mixture;

[0068] Fill the mixture into the cylindrical through-hole mold 12 (size is Φ3*3mm) of the sample plate 11, and then place the sample plate filled with the mixture between the first pole head 1 and the second pole head 10, so that the first pole head 1, the cylindrical through-hole mold filled with the mixture and the second pole head 10 are tightly fitted, and a closed magnetic circuit is formed between the first pole head 1, the first pole 2, the first magnetic steel plate 3, the permanent magnet 4, the second magnetic steel plate 5, the second pole 9, the second pole head 10 and the mixture in the sample plate 11 to achieve the orientation of the anisotropic bonded rare earth permanent magnet powder. After curing for 2 hours, a magnetic property test sample of the anisotropic bonded rare earth permanent magnet powder is formed in the cylindrical through-hole mold and can be taken out.

[0069] The sample prepared by the present invention is placed in VSM for hysteresis loop testing to obtain Ms, Mr, Hcj and (BH) of the anisotropic bonded rare earth permanent magnet powder. maxThe results show that the samples prepared by the present invention can meet the requirements of VSM test.

[0070] It can be seen from the above embodiments that the present invention provides a device and method for preparing a sample for testing magnetic properties of anisotropic bonded rare earth permanent magnet powder, which is suitable for sample preparation of anisotropic bonded rare earth permanent magnet powder.

[0071] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A preparation device for anisotropic bonded rare earth permanent magnet powder magnetic property test samples, characterized in that: include: A first pole head (1), a first pole column (2), a first magnetic conductive steel plate (3), a permanent magnet (4), a second magnetic conductive steel plate (5), a second pole column (9), a second pole head (10) and a sample plate (11); One end of the first pole (2) is connected to one end of the first pole head (1), and the other end is connected to the upper part of the first magnetic conductive steel plate (3); The lower part of the first magnetic conductive steel plate (3) is connected to one end of the permanent magnet (4); The other end of the permanent magnet (4) is connected to the lower part of the second magnetic conductive steel plate (5); The upper portion of the second magnetic conductive steel plate (5) is connected to one end of the second pole (9); The other end of the second pole (9) is connected to the second pole head (10); The sample plate (11) is provided with a cylindrical through-hole mold (12); the sample plate (11) is detachably arranged between the first pole head (1) and the second pole head (10); the diameter of the cylindrical through-hole mold (12) is smaller than the end surface diameters of the first pole head (1) and the second pole head (10); the material of the sample plate (11) is a non-magnetic conductive material; The axes of the first pole head (1), the first pole column (2), the second pole column (9) and the second pole head (10) coincide with each other; the first pole head (1), the first pole column (2), the second pole column (9) and the second pole head (10) are made of magnetic conductive material; A magnetic circuit is formed between the first pole head (1), the first pole column (2), the first magnetic conductive steel plate (3), the permanent magnet (4), the second magnetic conductive steel plate (5), the second pole column (9) and the second pole head (10).

2. The preparation device according to claim 1, characterized in that: The first pole head (1) and the second pole head (10) are both conical pole heads with a contraction half angle of 60°.

3. The preparation device according to claim 2, characterized in that: The large end of the first pole (1) is integrally connected to the first pole (2); and the large end of the second pole (10) is integrally connected to the second pole (9).

4. The preparation device according to claim 1, characterized in that: The diameter of the cylindrical through-hole mold (12) is 3-5 mm, and the aspect ratio is 1.

5. The preparation device according to claim 1, characterized in that: The first pole head (1), the first pole column (2), the second pole column (9) and the second pole head (10) are independently made of electrical pure iron or Fe-Co alloy.

6. The preparation device according to claim 1, characterized in that: It also includes a tightening nut (6), a tightening rod (7) and an optical axis fixing ring (8); the tightening rod (7) is fixedly connected to the tightening nut (6) and is used to rotate the tightening nut (6); The end of the second pole (9) away from the second pole head (10) is provided with a thread, and the second pole (9) sequentially passes through the second magnetic steel plate (5) and the optical axis fixing ring (8) to be connected to the tightening nut (6) by thread, and the first pole (2) is fixedly connected to the first magnetic steel plate (3); or the end of the first pole (2) away from the first pole head (1) is provided with a thread, and the first pole (2) sequentially passes through the first magnetic steel plate (3) and the optical axis fixing ring (8) to be connected to the tightening nut (6) by thread, and the second pole (9) is fixedly connected to the second magnetic steel plate (5).

7. The preparation device according to claim 6, characterized in that: The optical axis fixing ring (8) is made of a non-magnetic material.

8. A method for preparing a sample for testing magnetic properties of anisotropic bonded rare earth permanent magnet powder, using the preparation device according to any one of claims 1 to 7, the preparation method comprising the following steps: The anisotropic bonded rare earth permanent magnet powder and a binder are mixed to obtain a mixture; the binder has a curing time of 2 to 3 hours; The mixture is filled into the cylindrical through-hole mold (12), and then the sample plate filled with the mixture is placed between the first pole head (1) and the second pole head (10), so that the first pole head (1), the cylindrical through-hole mold filled with the mixture and the second pole head (10) are tightly fitted, and a closed magnetic circuit is formed between the first pole head (1), the first pole column (2), the first magnetic steel plate (3), the permanent magnet (4), the second magnetic steel plate (5), the second pole column (9), the second pole head (10) and the mixture in the sample plate (11), so as to achieve the orientation of the anisotropic bonded rare earth permanent magnet powder. After curing, a magnetic property test sample of the anisotropic bonded rare earth permanent magnet powder is formed in the cylindrical through-hole mold.

9. The preparation method according to claim 8, characterized in that: The content of the anisotropic bonded rare earth permanent magnet powder in the mixture is 30-80wt%.

10. The preparation method according to claim 8, characterized in that: The adhesive includes AB adhesive.

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