Method of directional cutting of magnetic material and wire cutting apparatus

Abstract

The application belongs to the technical field of magnetic material cutting, and particularly provides a directional cutting method of magnetic material and a wire cutting device. The directional cutting method of the magnetic material is suitable for the wire cutting device, and the wire cutting device comprises a cutting wire and a feeding device. The directional cutting method comprises the following steps: fixing a target magnetic material on the feeding device in a posture that the magnetic pole direction of the target magnetic material is perpendicular to the cutting wire; and controlling the cutting wire and the feeding device to operate so as to cut the target magnetic material. The target magnetic material is fixed on the feeding device in the posture that the magnetic pole direction of the target magnetic material is perpendicular to the cutting wire, so that the magnetic pole direction of the target magnetic material is perpendicular to the cutting wire when the target magnetic material is cut by the cutting wire, the cutting quality of the target magnetic material is greatly improved, and an unexpected technical effect is achieved.

Description

Technical Field

[0001] This invention belongs to the field of magnetic material cutting technology, and specifically provides a method for directional cutting of magnetic materials and a wire cutting device. Background Technology

[0002] Neodymium iron boron (NdFeB) magnets have a tetragonal crystal structure, exhibiting strong magnetocrystalline anisotropy and high saturation magnetization. Compared to other types of permanent magnet materials, NdFeB magnets possess extremely high energy product and coercivity. Due to their superior magnetic properties, NdFeB magnets are widely used in modern industry, electronics, and the medical field. Examples include electric motors, generators, acoustic transducers, various sensors, medical devices, and magnetic machinery.

[0003] The main manufacturing processes for neodymium iron boron (NdFeB) magnets include powder metallurgy and melt quenching. The powder metallurgy process typically involves first crushing the raw materials into powder, then pressing the powder into a shape in a magnetic field, and finally sintering the green body to densify it. The sintered magnet is then magnetized to complete the NdFeB magnet production.

[0004] Existing neodymium iron boron magnets, after being processed by powder metallurgy and melt quenching, are typically large in size, while neodymium iron boron magnets used in actual applications are smaller in size, thus requiring cutting.

[0005] Currently, wire EDM (Electrical Discharge Machining) equipment is commonly used to cut NdFeB magnets. During cutting, the NdFeB magnet is fixed to the feed device of the wire EDM equipment, and then the feed device is controlled to move towards the cutting wire, thus causing the cutting wire to cut the NdFeB magnet. However, existing wire EDM equipment produces poor cutting quality of NdFeB magnets, resulting in poor surface roughness, tolerances, and other key performance parameters of the cut magnetic sheets. This technical problem has long troubled those skilled in the art, who have been eager to solve it, but without success. Summary of the Invention

[0006] Those skilled in the art have creatively discovered that when using wire cutting equipment to cut magnetic materials, especially neodymium iron boron magnets, the quality of the cut magnetic material with the magnetic pole direction perpendicular to the cutting line is significantly higher than that of the cut magnetic material with the magnetic pole direction not perpendicular to the cutting line.

[0007] Therefore, in a first aspect, the present invention provides a method for directional cutting of magnetic materials, applicable to wire cutting equipment, the wire cutting equipment including a cutting wire and a feeding device; the directional cutting method includes:

[0008] The target magnetic material is fixed to the feeding device with its magnetic pole direction perpendicular to the cutting line;

[0009] The cutting line and the feeding device are controlled to cut the target magnetic material.

[0010] Optionally, the wire cutting device includes a first cutting roller and a second cutting roller, and the cutting wire is wound on the first cutting roller and the second cutting roller to form a wire mesh for cutting the target magnetic material; the magnetic pole direction of the target magnetic material is perpendicular or parallel to the plane where the wire mesh is located.

[0011] Optionally, the feeding device is configured to be rotatable; the step of fixing the target magnetic material onto the feeding device with its magnetic pole direction perpendicular to the cutting line includes:

[0012] The target magnetic material is fixed to the feeding device;

[0013] Obtain the magnetic pole orientation of the target magnetic material;

[0014] Control the feed device to rotate until the magnetic pole direction is perpendicular to the cutting line.

[0015] Optionally, the feeding device includes a Hall sensor for detecting the magnetic pole direction of the target magnetic material; the step of obtaining the magnetic pole direction of the target magnetic material includes:

[0016] The feeding device is controlled to rotate one revolution, and the direction of the magnetic poles of the target magnetic material is continuously detected by the Hall sensor;

[0017] The magnetic pole direction of the target magnetic material is calibrated based on the rotation angle of the feeding device and the magnetic pole direction detected by the Hall sensor, and the calibrated magnetic pole direction is taken as the magnetic pole direction of the target magnetic material.

[0018] Optionally, the step of controlling the operation of the cutting line and the feeding device includes:

[0019] Control the cutting line to move forward X meters and then backward Y meters in a reciprocating motion;

[0020] Control the feed device to move toward the cutting line;

[0021] In this case, both X and Y are positive numbers greater than 0, and X is greater than Y.

[0022] Optionally, the step of controlling the feed device to move toward the cutting line includes:

[0023] When the target magnetic material moves to the point where it just contacts the cutting line, the current position of the feeding device is recorded as the cutting zero point;

[0024] The feed device is controlled to move from the cutting zero point toward the cutting line according to a preset feed strategy.

[0025] Optionally, the step of controlling the feed device to move from the cutting zero point toward the cutting line according to a preset feed strategy includes:

[0026] Cutting step: Control the feed device to run a first stroke from the cutting zero point at a first feed speed;

[0027] Rapid cutting step: Control the feeding device to run a second stroke at a second feed speed from the end of the first stroke;

[0028] Final cutting step: Control the feeding device to run at a third feed speed from the end of the second stroke until the target magnetic material is completely cut;

[0029] Among them, the first feed rate, the third feed rate, and the second feed rate increase sequentially.

[0030] In a second aspect, the present invention provides a wire cutting apparatus, including a cutting wire and a feeding device, the feeding device being used to fix a target magnetic material so that, as the feeding device moves toward the cutting wire, the cutting wire cuts the target magnetic material; the target magnetic material is configured such that its magnetic pole direction is perpendicular to the cutting wire.

[0031] Optionally, the wire cutting device includes a first cutting roller and a second cutting roller, and the cutting wire is wound on the first cutting roller and the second cutting roller to form a wire mesh for cutting the target magnetic material;

[0032] The target magnetic material is configured such that its magnetic pole direction is perpendicular or parallel to the plane where the wire mesh is located.

[0033] Optionally, the feeding device is rotatable; the feeding device includes a Hall sensor for detecting the magnetic pole direction of the target magnetic material; the wire cutting device is configured to control the feeding device to rotate one revolution before the cutting wire cuts the target magnetic material, and continuously detect the magnetic pole direction of the target magnetic material through the Hall sensor; calibrate the magnetic pole direction of the target magnetic material according to the rotation angle of the feeding device and the magnetic pole direction detected by the Hall sensor, and take the calibrated magnetic pole direction as the magnetic pole direction of the target magnetic material; control the feeding device to rotate to a position where the magnetic pole direction of the target magnetic material is perpendicular to the cutting wire.

[0034] Based on the foregoing description, those skilled in the art will understand that in the aforementioned technical solution of this invention, by fixing the target magnetic material to the feeding device with its magnetic pole direction perpendicular to the cutting line, the magnetic pole direction of the target magnetic material is perpendicular to the cutting line when it is cut, which greatly improves the cutting quality of the target magnetic material and achieves unexpected technical effects. This point will be explained in detail below with reference to experimental data.

[0035] Furthermore, by making the feeding device rotatable, it can drive the target magnetic material to rotate, thereby aligning the magnetic pole direction of the target magnetic material perpendicular to the cutting line. By configuring a Hall sensor to detect the magnetic pole direction of the target magnetic material, and controlling the feeding device to rotate one revolution before the cutting line cuts the target magnetic material, while the Hall sensor continuously detects the magnetic pole direction of the target magnetic material, the magnetic pole direction of the target magnetic material is calibrated based on the rotation angle of the feeding device and the magnetic pole direction detected by the Hall sensor. Therefore, this invention also ensures the accuracy of the magnetic pole direction of the target magnetic material, avoiding inaccurate detection of the magnetic pole direction due to the special volume or uneven magnetic distribution of the target magnetic material.

[0036] Other beneficial effects of the present invention will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand the improved objectives, features and advantages of the present invention. Attached Figure Description

[0037] To more clearly illustrate the technical solution of the present invention, some embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that the same reference numerals may indicate the same or similar parts or components in different drawings; the drawings of the present invention are not necessarily drawn to scale. In the drawings:

[0038] Figure 1 This is a simplified diagram of a wire cutting device in some embodiments of the present invention (the magnetic pole direction of the target magnetic material is parallel to the wire mesh).

[0039] Figure 2 This is a simplified diagram of a wire cutting device in some embodiments of the present invention (the magnetic pole direction of the target magnetic material is perpendicular to the wire mesh).

[0040] Figure 3 This is a schematic block diagram of the feeding device in some embodiments of the present invention;

[0041] Figure 4 This is a flowchart of the steps of the directional cutting method for magnetic materials in other embodiments of the present invention;

[0042] Figure 5 This is a flowchart of the steps for adjusting the position of the target magnetic material in some other embodiments of the present invention;

[0043] Figure 6 This is a flowchart of the steps for calibrating the magnetic pole direction of the target magnetic material in some other embodiments of the present invention;

[0044] Figure 7 This is a flowchart of the working steps of the cutting line in some other embodiments of the present invention;

[0045] Figure 8 This is a flowchart of the cutting process of the cutting line in some other embodiments of the present invention;

[0046] Figure 9 This is a flowchart of the cutting steps of the cutting line in some other embodiments of the present invention;

[0047] Figure 10 This is a comparison table of parameters between magnetic materials cut by the directional cutting method of this invention and magnetic materials cut by existing technologies. Detailed Implementation

[0048] Those skilled in the art should understand that the embodiments described below are merely a part of the embodiments of the present invention, and not all of the embodiments of the present invention. These partial embodiments are intended to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those skilled in the art without creative effort should still fall within the scope of protection of the present invention.

[0049] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. For example, unless otherwise specified, the terms "installation," "connection," "joining," and "fixing" can specifically refer to any feasible connection form such as bolted connections, screw connections, welding, insertion, riveting, fusion welding, and snap-fitting.

[0051] Those skilled in the art have creatively discovered that when using wire cutting equipment to cut magnetic materials, especially neodymium iron boron magnets, the quality of the cut magnetic material with the magnetic pole direction perpendicular to the cutting line is significantly higher than that of the cut magnetic material with the magnetic pole direction not perpendicular to the cutting line.

[0052] Therefore, the present invention provides a wire cutting device and a method for directional cutting of magnetic materials.

[0053] To enable those skilled in the art to understand the technical solution of the present invention, reference is now made to... Figure 1 The following is a brief description of the wire cutting equipment in some embodiments of the present invention.

[0054] like Figure 1 As shown, in some embodiments of the present invention, the wire cutting device 100 includes a cutting wire 110 and a feeding device 120. The feeding device 120 is used to fix the target magnetic material 200 so that when the feeding device 120 moves toward the cutting wire 110, the cutting wire 110 cuts the target magnetic material 200.

[0055] Among them, the feed device 120 can be as follows: Figure 1 The structure shown is plate-like, but it can also be other structures, such as block-like or mesh-like structures. Furthermore, the wire cutting equipment 100 includes a drive unit for moving the feed device 120. This drive unit can be any feasible power device such as a motor, electric cylinder, pneumatic cylinder, or hydraulic cylinder.

[0056] In this invention, the cutting wire 110 can be diamond wire or any other feasible cutting wire. The target magnetic material 200 can be neodymium iron boron magnet or any other feasible magnetic material, such as samarium cobalt magnet, ferrite magnet, AlNiCo magnet, etc.

[0057] Continue reading Figure 1In some embodiments of the present invention, the wire cutting device 100 may further include a first cutting roller 131 and a second cutting roller 132, and the cutting wire 110 is wound on the first cutting roller 131 and the second cutting roller 132 to form a wire mesh for cutting the target magnetic material 200.

[0058] Those skilled in the art will understand that the wire mesh is composed of multiple parallel or nearly parallel cutting lines 110, so that the cutting lines 110 simultaneously make multiple cuts on the target magnetic material 200, thereby improving the cutting efficiency of the wire cutting equipment 100 on the target magnetic material 200.

[0059] Furthermore, although not shown in the figures, in some embodiments of the present invention, the first cutting roller 131 and the second cutting roller 132 are respectively provided with multiple grooves. The cutting wires 110 are embedded in the grooves to ensure the spacing between adjacent cutting wire segments 110 in the wire mesh.

[0060] Furthermore, although not shown in the figure, in some embodiments of the present invention, the wire cutting device 100 may also include a driving device for driving the first cutting roller 131 and / or the second cutting roller 132 to rotate, so as to drive the first cutting roller 131 and / or the second cutting roller to rotate through the driving device.

[0061] Furthermore, although not shown in the figures, in some embodiments of the present invention, the wire cutting device 100 may also include a wire take-up and release control device for controlling the cutting speed, acceleration / deceleration, and wire tension of the cutting wire 110. The wire cutting device 100 may also include a guide rail around which the cutting wire 110 passes to change the direction of the cutting wire 110.

[0062] like Figure 1 As shown, in some embodiments of the present invention, the wire cutting equipment 100 may further include a first spray device 141 and a second spray device 142. The first spray device 141 and the second spray device 142 are used to spray cutting fluid onto the wire mesh, which may be cutting oil or water-based cutting fluid.

[0063] The first spraying device 141 and the second spraying device 142 are configured such that the cutting fluid they spray is sprayed onto the junction of the wire mesh and the target magnetic material 200.

[0064] In other words, when the wire mesh begins to cut the target magnetic material 200, the wire mesh will form two junctions with the target magnetic material 200 on both sides in the direction of its movement. The first spray device 141 and the second spray device 142 will spray their respective cutting fluids onto these junctions.

[0065] Those skilled in the art will understand that the cutting fluid sprayed by the first spray device 141 and the second spray device 142 can not only cool the cutting wire 110 (which generates a lot of heat when cutting the target magnetic material 200), but also remove the magnetic mud generated during the cutting process of the target magnetic material 200.

[0066] like Figure 1 As shown, in order to prevent the cutting line 110 from cutting the feeding device 120, the marble slab 300 can be fixed on the feeding device 120 first, and then the target magnetic material 200 can be fixed on the marble slab 300.

[0067] Furthermore, to make the target magnetic material 200 perpendicular to the cutting line 110 with its magnetic pole direction, it can be done as follows: Figure 1 The double-headed arrows indicate that the magnetic pole direction of the target magnetic material 200 is parallel to the plane containing the wire mesh, or as shown in the image. Figure 2 The double-headed arrows indicate that the magnetic pole direction of the target magnetic material 200 is perpendicular to the plane where the wire mesh is located.

[0068] In order to achieve the goal of making the magnetic pole direction of the target magnetic material 200 perpendicular to the cutting line 110, the operator can measure the magnetic pole direction of the target magnetic material 200 and then fix the target magnetic material 200 onto the feeding device 120 with its magnetic pole direction perpendicular to the cutting line 110.

[0069] Alternatively, those skilled in the art may use other methods to make the magnetic pole direction of the target magnetic material 200 perpendicular to the cutting line 110.

[0070] In some embodiments of the present invention, the feeding device 120 is configured to be rotatable so that the magnetic pole direction of the target magnetic material 200 on the feeding device 120 is perpendicular to the cutting line 110 by controlling the rotation of the feeding device 120.

[0071] Further as Figure 3 As shown, the feeding device 120 includes a rotating device 121 to drive the feeding device 120 to rotate. The rotating device 121 can be a motor, specifically a servo motor or a stepper motor.

[0072] Continue reading Figure 3 In some embodiments of the present invention, the wire cutting device 100 includes a Hall sensor 150 for detecting the magnetic pole direction of the target magnetic material 200, so as to detect the magnetic pole direction of the target magnetic material 200 by the Hall sensor 150, and then control the rotating device 121 to rotate the feeding device 120 to a position where the magnetic pole direction of the target magnetic material 200 is perpendicular to the cutting line 110.

[0073] Specifically, in some embodiments of the present invention, the wire cutting device may be configured to control the feed device 120 to rotate one revolution before the cutting wire 110 cuts the target magnetic material 200, and continuously detect the magnetic pole direction of the target magnetic material 200 through the Hall sensor 150; calibrate the magnetic pole direction of the target magnetic material 200 according to the rotation angle of the feed device 120 and the magnetic pole direction detected by the Hall sensor 150, and take the calibrated magnetic pole direction as the magnetic pole direction of the target magnetic material 200; and control the feed device 120 to rotate to a position where the magnetic pole direction of the target magnetic material 200 is perpendicular to the cutting wire 110.

[0074] Those skilled in the art will understand that, in some embodiments of the present invention, by configuring a Hall sensor 150 for detecting the magnetic pole direction of the target magnetic material 200, and controlling the feed device 120 to rotate one revolution before the cutting line 110 cuts the target magnetic material 200, while the Hall sensor 150 continuously detects the magnetic pole direction of the target magnetic material 200; thereby, the magnetic pole direction of the target magnetic material 200 is calibrated based on the rotation angle of the feed device 120 and the magnetic pole direction detected by the Hall sensor 150. Therefore, the present invention ensures the accuracy of the magnetic pole direction of the target magnetic material 200, avoiding inaccurate detection of the magnetic pole direction due to the special volume or uneven magnetic distribution of the target magnetic material 200.

[0075] It should be noted that other components and structures of the wire cutting equipment 100 not described in some embodiments of the present invention are common components and structures of existing wire cutting equipment 100 and are well known to those skilled in the art, and therefore will not be described in detail.

[0076] The following section, in conjunction with the feed device 120 described above and referring to... Figures 4 to 9 The method for directional cutting of magnetic materials in other embodiments of the present invention will be described in detail below.

[0077] like Figure 4 As shown, in some other embodiments of the present invention, the directional cutting method includes:

[0078] Step S100: Fix the target magnetic material 200 onto the feeding device 120 with its magnetic pole direction perpendicular to the cutting line 110.

[0079] In step S200, the cutting wire 110 and the feeding device 120 are controlled to operate to cut the target magnetic material 200.

[0080] In step S110, the magnetic pole direction of the target magnetic material 200 can be made perpendicular or parallel to the plane where the wire mesh is located.

[0081] Those skilled in the art will understand that, in other embodiments of the present invention, by fixing the target magnetic material 200 to the feeding device 120 with its magnetic pole direction perpendicular to the cutting line 110, the magnetic pole direction of the target magnetic material 200 is perpendicular to the cutting line 110 when it is cut by the cutting line 110, which greatly improves the cutting quality of the target magnetic material 200 and achieves unexpected technical effects.

[0082] Furthermore, in step S110, after the operator measures the magnetic pole direction of the target magnetic material 200, the target magnetic material 200 is fixed on the feeding device 120 with its magnetic pole direction perpendicular to the cutting line 110.

[0083] For example, use 502 glue to bond the marble slab 300 and the feeding device 120 together, then attach the target magnetic material 200 to the marble slab 300 with its magnetic poles facing up / down or forward / backward, and then suspend the bonded target magnetic material 200 directly above the wire mesh.

[0084] Alternatively, those skilled in the art may use other methods to make the magnetic pole direction of the target magnetic material 200 perpendicular to the cutting line 110.

[0085] like Figure 5 As shown, step S110 may further include:

[0086] Step S110: Fix the target magnetic material 200 to the feeding device 120. For example, use 502 glue to bond the marble slab 300 and the feeding device 120 together, and then randomly stick the target magnetic material 200 onto the marble slab 300.

[0087] Step S120: Obtain the magnetic pole direction of the target magnetic material 200.

[0088] Step S130: Control the feed device 120 to rotate until the magnetic pole direction is perpendicular to the cutting line 110.

[0089] like Figure 6 As shown, step S120 may further include:

[0090] In step S121, the feed device 120 is controlled to rotate one revolution, and the direction of the magnetic poles of the target magnetic material 200 is continuously detected by the Hall sensor 150.

[0091] Step S122: Based on the rotation angle of the feeding device 120 and the magnetic pole direction detected by the Hall sensor 150, the magnetic pole direction of the target magnetic material 200 is calibrated, and the calibrated magnetic pole direction is taken as the magnetic pole direction of the target magnetic material 200.

[0092] Those skilled in the art will understand that during one revolution of the feeding device 120, the magnetic pole direction of the target magnetic material 200 detected by the Hall sensor 150 will change in real time, and may occasionally exhibit temporary and repetitive changes. After discarding the data with repetitive changes, the magnetic pole direction of the target magnetic material 200 can be determined based on the remaining real-time changing data.

[0093] Therefore, other embodiments of the present invention also ensure the accuracy of the magnetic pole direction of the target magnetic material 200, avoiding inaccurate detection of the magnetic pole direction due to the special volume or uneven magnetic distribution of the target magnetic material 200.

[0094] like Figure 7 As shown, step S200 may further include:

[0095] Step S210: Control the cutting line 110 to move forward X meters and then backward Y meters in a reciprocating motion.

[0096] Step S220: Control the feed device 120 to move toward the cutting line 110.

[0097] In this system, both X and Y are positive numbers greater than 0, and X is greater than Y. For example, X can be 1.5 meters, 2 meters, 3 meters, etc., and Y can be 1 meter, 1.5 meters, 2.2 meters, etc.

[0098] In other words, the cutting process of the cutting wire 110 on the target magnetic material 200 is a reciprocating cutting process, that is, the cutting wire 110 first feeds forward X meters, and then returns backward Y meters. One feeding and one return constitutes one cycle, and XY is the wire consumption per single step cycle.

[0099] Those skilled in the art will understand that the above-described cutting method of the cutting wire 110 ensures the cutting effect of the cutting wire 110 on the target magnetic material 200 while reducing the wear of the cutting wire 110.

[0100] Further as Figure 8 As shown, step S220 may further include:

[0101] Step S221: When the target magnetic material 200 moves to just contact the cutting line 110, the current position of the feeding device 120 is recorded as the cutting zero point, so as to determine the stroke of the feeding device 120 when cutting the target magnetic material 200 by the cutting line 110 through the determined cutting zero point.

[0102] This step can be manually determined by the operator by observing the contact between the target magnetic material 200 and the cutting wire 110. It can also be determined by detecting changes in the tension of the cutting wire 110. For example, when a sudden increase in the tension of the cutting wire 110 is detected, it is determined that the target magnetic material 200 has moved to just make contact with the cutting wire 110, and the current position of the feed device 120 is recorded as the cutting zero point.

[0103] Step S222: Control the feed device 120 to move from the cutting zero point toward the cutting line 110 according to a preset feed strategy. The preset feed strategy is as follows: Figure 9 As shown.

[0104] like Figure 9 As shown, step S222 may further include:

[0105] Step S2221, Cutting Step: Control the feed device 120 to run the first stroke from the cutting zero point at the first feed speed.

[0106] Step S2222, rapid cutting step: control the feed device 120 to run the second stroke at the second feed speed from the end of the first stroke.

[0107] Step S2223, finishing cutting step: control the feed device 120 to run at the third feed speed from the end of the second stroke until the target magnetic material 200 is cut.

[0108] Among them, the first feed rate, the third feed rate, and the second feed rate increase sequentially.

[0109] Furthermore, the first feed rate can be 200 μm / min. In addition, those skilled in the art can set the first feed rate to other feasible values ​​as needed, such as 250 μm / min, 220 μm / min, 190 μm / min, etc.

[0110] The second feed rate can be 450 μm / min. In addition, those skilled in the art can set the second feed rate to any other feasible value as needed, such as 470 μm / min, 440 μm / min, 400 μm / min, 390 μm / min, etc.

[0111] The third feed rate can be 300 μm / min. In addition, those skilled in the art can set the second feed rate to any other feasible value as needed, such as 370 μm / min, 320 μm / min, 390 μm / min, 370 μm / min, etc.

[0112] The first stroke is selected from any value between 2mm and 3mm. For example, 2mm, 2.5mm, 2.8mm, 3mm, etc.

[0113] The second stroke is selected from any value between 12.5mm and 13.5mm. For example, 12.5mm, 13mm, 13.5mm, etc.

[0114] Furthermore, in this invention, the diameter of the cutting line 110 is selected from any value between 100 μm and 170 μm. For example, 100 μm, 110 μm, 120 μm, 150 μm, 170 μm, etc.

[0115] Preferably, the diameter of the cutting line 110 is selected from any value between 100μm and 120μm, such as 100μm, 105μm, 110μm, 120μm, etc.

[0116] like Figure 10 As shown, a parameter comparison table is presented for magnetic materials cut by the directional cutting method of the present invention and those cut by the prior art. In this table, m% represents the percentage of the total number of target magnetic materials 200 cut in a single cut that have a tolerance less than or equal to their corresponding tolerance. For example, in item 1, 89% corresponding to a tolerance of ±0.01 indicates that, in a single cut using the directional cutting method of the present invention (when the feed device 120 moves from the cutting zero point to the point where the target magnetic material 200 has been cut), the number of target magnetic materials 200 with a tolerance less than or equal to ±0.01 is out of the total number of target magnetic materials 200 cut in this single cut.

[0117] For ease of description, this percentage will now be referred to as the compliance rate.

[0118] from Figure 10 As can be seen from the table, the target magnetic material 200 cut by the directional cutting method of the present invention has a significantly higher success rate than the prior art. Therefore, the present invention has achieved unexpected technical effects.

[0119] based on Figure 10 As those skilled in the art can understand from the data in the table, while the present invention can improve the cutting quality of the target magnetic material 200, it also improves the uniformity of the surface texture of the cut target magnetic material 200 and the quality of the surface roughness.

[0120] Meanwhile, since the present invention can improve cutting efficiency and quality under the condition of using the same wire diameter cutting wire 110, when using the directional cutting method of the present invention, finer cutting wires 110 (e.g., cutting wires 110 of 100μm to 120μm) can also be used to save material of cutting wire 110 and improve cutting efficiency.

[0121] The technical solutions of the present invention have been described in conjunction with several embodiments above. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Without departing from the technical principles of the present invention, those skilled in the art can disassemble and combine the technical solutions in the above embodiments, and can also make equivalent changes or substitutions to related technical features. Any changes, equivalent substitutions, improvements, etc., made within the technical concept and / or technical principles of the present invention will fall within the scope of protection of the present invention.

Claims

1. A method for directional cutting of magnetic materials, applicable to wire cutting equipment, the wire cutting equipment comprising a cutting wire, a rotatable feeding device, and a Hall sensor for detecting the magnetic pole direction of the target magnetic material; The directional cutting method includes: The target magnetic material is fixed to the feeding device with its magnetic pole direction perpendicular to the cutting line; Control the operation of the cutting line and the feeding device to cut the target magnetic material; The step of fixing the target magnetic material onto the feeding device with its magnetic pole direction perpendicular to the cutting line includes: The target magnetic material is fixed to the feeding device; The feeding device is controlled to rotate one revolution, and the direction of the magnetic poles of the target magnetic material is continuously detected by the Hall sensor; The magnetic pole direction of the target magnetic material is calibrated based on the rotation angle of the feeding device and the magnetic pole direction detected by the Hall sensor, and the calibrated magnetic pole direction is taken as the magnetic pole direction of the target magnetic material. Control the feed device to rotate until the magnetic pole direction is perpendicular to the cutting line.

2. The directional cutting method according to claim 1, wherein, The wire cutting equipment includes a first cutting roller and a second cutting roller, and the cutting wire is wound on the first cutting roller and the second cutting roller to form a wire mesh for cutting the target magnetic material; The magnetic pole direction of the target magnetic material is perpendicular or parallel to the plane where the wire mesh is located.

3. The directional cutting method according to claim 1, wherein, The steps for controlling the operation of the cutting line and the feeding device include: Control the cutting line to move forward X meters and then backward Y meters in a reciprocating motion; Control the feed device to move toward the cutting line; In this case, both X and Y are positive numbers greater than 0, and X is greater than Y.

4. The directional cutting method according to claim 3, wherein, The step of controlling the feed device to move toward the cutting line includes: When the target magnetic material moves to the point where it just contacts the cutting line, the current position of the feeding device is recorded as the cutting zero point; The feed device is controlled to move from the cutting zero point toward the cutting line according to a preset feed strategy.

5. The directional cutting method according to claim 4, wherein, The step of controlling the feed device to move from the cutting zero point toward the cutting line according to a preset feed strategy includes: Cutting step: Control the feed device to run a first stroke from the cutting zero point at a first feed speed; Rapid cutting step: Control the feeding device to run a second stroke at a second feed speed from the end of the first stroke; Final cutting step: Control the feeding device to run at a third feed speed from the end of the second stroke until the target magnetic material is completely cut; Wherein, the second feed speed is greater than the third feed speed, and the third feed speed is greater than the first feed speed.

6. A wire cutting device, comprising a cutting wire, a rotatable feed device, and a Hall sensor for detecting the magnetic pole orientation of a target magnetic material. The feeding device is used to fix the target magnetic material so that when the feeding device moves toward the cutting line, the cutting line cuts the target magnetic material; The target magnetic material is configured such that its magnetic pole direction is perpendicular to the cutting line; The wire cutting equipment is configured to, before the cutting wire cuts the target magnetic material, control the feed device to rotate one revolution and continuously detect the magnetic pole direction of the target magnetic material through the Hall sensor; calibrate the magnetic pole direction of the target magnetic material according to the rotation angle of the feed device and the magnetic pole direction detected by the Hall sensor, and take the calibrated magnetic pole direction as the magnetic pole direction of the target magnetic material; control the feed device to rotate to a position where the magnetic pole direction of the target magnetic material is perpendicular to the cutting wire.

7. The wire cutting equipment according to claim 6, wherein, The wire cutting equipment includes a first cutting roller and a second cutting roller, and the cutting wire is wound on the first cutting roller and the second cutting roller to form a wire mesh for cutting the target magnetic material; The target magnetic material is configured such that its magnetic pole direction is perpendicular or parallel to the plane where the wire mesh is located.

Images