Two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets

Abstract

The invention discloses a neodymium-iron-boron magnetic sheet two-dimensional dot matrix magnetizer, and relates to the technical field of neodymium-iron-boron magnet machining equipment, and the neodymium-iron-boron magnetic sheet two-dimensional dot matrix magnetizer comprises a base, an X-axis stepping guide rail sliding table, a Y-axis stepping guide rail sliding table, an X-axis stepping motor, a Y-axis stepping motor, a connecting rod, an upper servo electric cylinder, a lower servo electric cylinder, a pulse excitation magnetic head and a pneumatic clamping jaw; the X-axis stepping guide rail sliding table and the Y-axis stepping guide rail sliding table form a cross-shaped sliding table mechanism and are installed on the base. An upper platform of the cross-shaped sliding table mechanism is connected with a connecting rod, the head of the connecting rod is provided with an upper servo electric cylinder and a lower servo electric cylinder through a connecting plate and a right-angle connecting plate, and the upper servo electric cylinder and the lower servo electric cylinder are respectively provided with a pulse excitation magnetic head; the base is provided with at least two pneumatic clamping jaws used for clamping neodymium iron boron magnetic sheets. The technical problem that an existing magnetizing device cannot achieve high-precision complex pattern magnetizing on a large-area thin neodymium iron boron magnetic sheet is solved.

Description

Technical Field

[0001] This invention relates to the field of neodymium iron boron magnet processing equipment, specifically to a special equipment for achieving high-precision two-dimensional dot matrix magnetization on large-area thin neodymium iron boron magnetic sheets, which can be widely used in magnetic sheet processing in fields such as new energy vehicle motors, precision sensors, and medical equipment. Background Technology

[0002] Neodymium iron boron (NdFeB) magnets, currently the permanent magnet material with the highest magnetic energy product, are increasingly being applied in more precise and complex scenarios. In high-end manufacturing, it is often necessary to fill large-area thin magnetic sheets (0.1-2mm thick) with complex magnetic patterns such as interlaced magnetic strips, concentric rings, and irregular shapes. Traditional magnetization equipment suffers from the following technical shortcomings: 1. The fixed magnetic head structure cannot achieve precise positioning in a two-dimensional plane and can only complete magnetization of a single polarity or simple patterns; 2. The magnetic head spacing adjustment accuracy is low (above ±0.1mm), making it difficult to adapt to the magnetization requirements of thin magnetic sheets of different thicknesses; 3. Lack of effective positioning detection and feedback mechanism, resulting in a large deviation between the magnetization pattern and the preset path; 4. During prolonged operation, the magnetic head experiences a significant temperature rise, leading to unstable magnetic field strength and affecting the consistency of magnetization. 5. Vibration during equipment operation interferes with the positioning accuracy of thin magnetic sheets, especially in scenarios requiring micron-level precision.

[0003] In the prior art, such as the automatic magnetization device disclosed in CN222483055U, the focus is on automated assembly line operation, but its magnetization head structure is fixed and cannot achieve complex pattern magnetization; although the rapid magnetization equipment of CN217788126U improves efficiency, it does not solve the technical problem of high-precision two-dimensional dot matrix magnetization.

[0004] Therefore, the development of a two-dimensional dot matrix magnetizer that combines high precision, flexibility and stability has become an urgent need in the industry. Summary of the Invention

[0005] The purpose of this invention is to provide a two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets, which aims to solve the technical problem that existing magnetizers cannot achieve high-precision magnetization of complex patterns on large-area thin neodymium iron boron magnetic sheets. Specifically, it includes: improving the magnetization positioning accuracy in a two-dimensional plane, achieving precise adjustment of the magnetic head spacing, ensuring the stability of the magnetic field during long-term operation, and reducing the impact of equipment vibration on thin magnetic sheets.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets includes a base, an X-axis stepper guide slide, a Y-axis stepper guide slide, an X-axis stepper motor, a Y-axis stepper motor, a connecting rod, an upper servo cylinder, a lower servo cylinder, a pulse excitation magnetic head, and a pneumatic gripper. The X-axis stepper slide and the Y-axis stepper slide form a cross slide mechanism and are mounted on the base. The X-axis stepper motor drives the X-axis stepper slide to move, and the Y-axis stepper motor drives the Y-axis stepper slide to move. The upper platform of the cross slide mechanism is connected to a connecting rod. The upper servo cylinder and the lower servo cylinder are installed on the head of the connecting rod through a connecting plate and a right-angle connecting plate. Pulse excitation magnetic heads are respectively installed on the upper servo cylinder and the lower servo cylinder. The base is equipped with at least two pneumatic grippers for holding neodymium iron boron magnets.

[0007] In a preferred embodiment, both the X-axis stepping guide slide and the Y-axis stepping guide slide adopt a ball screw drive structure.

[0008] In a preferred embodiment, the pulse excitation magnetic head includes a magnetic yoke and a magnetizing coil, wherein the magnetizing coil is made of multiple strands of enameled wire wound in parallel.

[0009] In a preferred embodiment, the pneumatic gripper includes a gripper body, a drive cylinder, and an elastic gripping pad. The elastic gripping pad is made of silicone material and has anti-slip textures on its surface.

[0010] In a preferred embodiment, a control system is further included, which is electrically connected to the X-axis stepper motor, the Y-axis stepper motor, the upper servo cylinder, the lower servo cylinder, the pulse excitation magnetic head, and the pneumatic gripper, respectively, for controlling the coordinated operation of each component.

[0011] In a preferred embodiment, the control system includes an industrial computer, a motion control card, and a human-machine interface, wherein the human-machine interface can preset and store a variety of different magnetization graphic programs.

[0012] In a preferred embodiment, the device further includes a positioning detection device comprising a CCD camera and an image recognition module for identifying the edge position and reference point of the neodymium iron boron magnet.

[0013] In a preferred embodiment, the connecting rod is a telescopic structure, comprising an inner rod and an outer rod, which are fixed together by locking bolts, and the overall length of the adjustable connecting rod is 300-500mm.

[0014] In a preferred embodiment, a cooling system is further included, comprising water-cooled pipes and a cooling fan. The water-cooled pipes are configured to fit the pulse excitation head, and the cooling fan is configured to correspond to the servo cylinder and the stepper motor.

[0015] In a preferred embodiment, the base is made of cast iron and has shock-absorbing pads at the bottom. The shock-absorbing pads are made of nitrile rubber and have a thickness of 10-20mm.

[0016] Due to the application of the above technical solution, the beneficial effects of this application compared with the prior art are as follows: 1. High-precision positioning: The cross slide and servo electric cylinder with closed-loop control are combined with CCD vision positioning, and the position accuracy of the magnetization point reaches ±0.01mm, which meets the micron-level processing requirements. 2. Graphic flexibility: Through the programmable control system and movable magnetic head, it can magnetize any two-dimensional graphic, and is compatible with a variety of patterns from simple stripes to complex irregular shapes; 3. Wide applicability: The magnetic head spacing can be precisely adjusted, and it can handle magnetic sheets with a thickness of 0.1-5mm. The clamping force is adjustable to avoid deformation of thin magnetic sheets. 4. Improved stability: The composite cooling system reduces magnetic field strength fluctuations to ≤±2%, while the anti-vibration base and closed-loop control minimize external interference; 5. Ease of operation: Supports graphic import and program storage, one-click start of automatic magnetization, reducing the difficulty of manual operation. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets according to the present invention; Figure 2 This is a side view of a two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets according to the present invention; Figure 3 This is a schematic diagram from another direction of a two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets according to the present invention; Figure 4 This is a schematic diagram of the concentric ring magnetic pole pulse array charging method of the present invention; Figure 5 This is a schematic diagram of the alternating pole magnetic strip pulse matrix charging method of the present invention; Figure 6 This is a schematic diagram of the circular magnetic pole pulse array charging method of the present invention; The components include: 1. Base; 2. X-axis stepper slide; 3. Y-axis stepper slide; 4. X-axis stepper motor; 5. Y-axis stepper motor; 6. Connecting rod; 7. Upper servo cylinder; 8. Lower servo cylinder; 9. Pulse excitation magnetic head; 10. Pneumatic gripper. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] Example 1 Please see Figure 1-3 This application provides a two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets, the overall structure of which includes: 1. Basic support system Base 1: Made of HT300 cast iron, integrally cast and aged to eliminate internal stress. Nitrile rubber shock-absorbing pads (15mm±5mm thick) are installed at the four corners of the bottom, with a Shore hardness of 60±5 degrees, which can absorb more than 80% of high-frequency vibrations.

[0026] Cross slide mechanism: It consists of X-axis stepping guide slide 2 and Y-axis stepping guide slide 3, both of which adopt C3 grade ball screw transmission. The guide rail is a precision linear slide rail with repeatability of ±0.005mm and maximum running speed of 100mm / s.

[0027] 2. Drive system X-axis stepper motor 4 and Y-axis stepper motor 5: These are two-phase hybrid stepper motors with a step angle of 0.9° / 1.8°. They are equipped with a 1000-line encoder to achieve closed-loop control and ensure the accuracy of motion position feedback.

[0028] Upper servo cylinder 7 and lower servo cylinder 8: These are ball screw servo cylinders with a stroke of 50mm, a positioning accuracy of ±0.01mm, and a thrust of 500N. They are used to adjust the spacing of the pulse excitation magnetic head 9 to meet the magnetization requirements of magnetic sheets with a thickness of 0.1-5mm.

[0029] 3. Magnetization Execution System Pulse excitation magnetic head 9: It consists of a DT4 electrical pure iron yoke and a magnetizing coil. The coil is made of 0.2mm multi-strand enameled wire (≥100 strands) wound in parallel. The peak current of a single magnetic head can reach 1000A. The magnetic field strength is continuously adjustable from 1.5 to 2.5T. The magnetic pole cross-section can be rectangular (5mm×10mm) or circular (φ8mm).

[0030] Pneumatic gripper 10: It adopts a parallel opening and closing structure, the working pressure of the driving cylinder is 0.4-0.6MPa, the clamping force is adjustable from 50-300N, the gripper surface is equipped with an elastic clamping pad with a Shore hardness of 50, and the surface is provided with a 0.5mm deep diamond anti-slip texture to avoid damage to the magnetic sheet surface during clamping.

[0031] 4. Control System Hardware configuration: Industrial computer (IPC-610) + multi-axis motion control card (PCI-1240) + pulse power controller, supporting 4-axis linkage control.

[0032] Software Functions: Equipped with dedicated control software under the Windows operating system, the human-machine interface includes a graphical editing module (supports DXF format import), a parameter setting module (magnetic strength, speed, path, etc.), a program storage module (can store ≥100 sets of magnetization programs) and a fault diagnosis module.

[0033] The human-machine interface can preset and store a variety of different magnetization graphic programs. There are about 8-12 commonly used magnetization graphics for neodymium iron boron thin magnetic sheets in the industry, such as staggered magnetic strips, circular surfaces, concentric rings, rectangular arrays, and irregular notch patterns, which can cover mainstream application scenarios. The industrial computer, paired with a conventional motion control card, only requires about 50-100KB of space to store 8-12 sets of graphic programs (including path, magnetic strength and other parameters), which is far below the hardware storage limit and the hardware storage capacity can support it. The 8-12 presets can reduce the user's repetitive editing operations, while avoiding the interface redundancy caused by too many programs. It meets the efficiency and operation-friendly requirements of small and medium-sized processing scenarios, and takes into account both practicality and convenience.

[0034] 5. Auxiliary systems Positioning detection device: It consists of a 2-megapixel CCD camera (30fps) and a deep learning-based image recognition module with a recognition accuracy of ±0.01mm. It can automatically identify the edge of the magnetic sheet and the position of the reference hole, and realize automatic coordinate calibration.

[0035] Cooling system: It adopts water cooling + air cooling composite heat dissipation. The water cooling pipeline is made of copper pipe (φ6mm) attached to the surface of the magnetic head, with a flow rate of 2L / min and an inlet temperature difference of ≤5℃. The servo motor and the electric cylinder are each equipped with two 6025 axial flow fans (air volume 12CFM) to ensure that the temperature rise of the equipment is ≤40℃ after 8 hours of continuous operation.

[0036] Telescopic connecting rod 6: It consists of an inner rod (φ20mm) and an outer rod (φ25mm) made of 45# steel. The length adjustment range is 300-500mm. The locking bolt is an M8 hex socket head cap screw. The repeatability error after adjustment is ≤0.02mm.

[0037] Its workflow is as follows: 1. Loading: Place the neodymium iron boron magnetic sheet on the worktable of base 1, and the pneumatic gripper 10 automatically clamps and fixes it; 2. Positioning Calibration: The positioning detection device captures images of the magnetic sheet, identifies the reference point, compares it with preset coordinates, and calculates the compensation value; 3. Parameter settings: Select or edit the magnetization graphic program through the control system to set parameters such as magnetic field strength and movement speed; 4. Spacing adjustment: The upper servo cylinder 7 and the lower servo cylinder 8 automatically adjust the spacing of the pulse excitation magnetic head 9 according to the thickness of the magnetic sheet; 5. Magnetization operation: The cross slide mechanism drives the magnetic head to move along the preset path, and pulse magnetization is performed synchronously, while the cooling system works in real time; 6. Completion: After magnetization is completed, the pneumatic gripper 10 releases, the magnetic sheet is removed, and the system automatically records the magnetization parameters.

[0038] Example 2 This application provides a two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets, specifically including: like Figure 1-3 As shown, the base 1 is made of cast iron, and four nitrile rubber anti-vibration pads are installed at the bottom. The X-axis stepper slide 2 is fixed to the surface of the base 1, and the Y-axis stepper slide 3 is vertically installed on the slider of the X-axis slide to form a cross slide mechanism. The X-axis stepper motor 4 and the Y-axis stepper motor 5 are connected to the ball screw of the slide through a coupling to drive the slide to achieve planar motion.

[0039] The lower end of the connecting rod 6 is fixed to the slider of the Y-axis slide table, and the upper end is connected by a right-angle connecting plate to install the upper servo cylinder 7 and the lower servo cylinder 8 respectively. The axes of the two cylinders coincide and are arranged in opposite directions. Each end is equipped with a pulse excitation magnetic head 9. Two pneumatic grippers 10 are symmetrically installed on the base 1 on both sides of the magnetization area. The gripper spacing can be adjusted according to the size of the magnetic sheet (range 50-300mm).

[0040] The industrial computer of the control system is placed in the side cabinet of the equipment. The human-machine interface uses a 15-inch touch screen and is connected to each actuator via cables. The CCD camera of the positioning and detection device is installed 300mm directly above the magnetized area. The lens focal length is 50mm and it can cover a detection range of 200×200mm.

[0041] The water-cooled main unit of the cooling system is placed below the equipment and connected to the cooling pipe of the magnetic head through a flexible hose; the cooling fans are installed on the housings of the stepper motor and the servo cylinder respectively, and are automatically started and stopped by the temperature control switch (set temperature 40℃).

[0042] When filling a concentric circular magnetic pole with a diameter of φ100mm (such as...) Figure 4 As shown), the specific parameters are set as follows: Magnetic field strength: 3.0T; Pulse frequency: 5Hz; Ring spacing: 1mm; Movement speed: 50mm / s; Number of magnetization points: 360 points per ring; In actual operation, the equipment first confirms the deviation between the center of the magnetic sheet and the origin of the equipment coordinates through visual positioning, and then automatically compensates for it before starting magnetization. The X-axis stepping guide slide 2 and the Y-axis stepping guide slide 3 drive the magnetic head to move along the circular trajectory. Every 1° of movement triggers a magnetization pulse. After completing the first round of N-pole magnetization, the magnetic head polarity and radius parameters are automatically adjusted to perform S-pole ring magnetization until all preset rings are completed.

[0043] Filling interleaved pole magnetic strips (such as Figure 5 (as shown) and circular magnetic poles (such as) Figure 6 As shown in the figure, the specific parameters can be adjusted adaptively according to the needs.

[0044] In practical applications, the equipment parameters can be adjusted according to specific needs. For example, adding a Z-axis adjustment mechanism can realize three-dimensional magnetization; adopting a multi-head array structure can improve magnetization efficiency; integrating a magnetic performance detection module can realize online detection of magnetization quality. These modifications and improvements should all be considered within the scope of protection of this invention, and the specific scope is subject to the limitations of the claims.

[0045] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets, characterized in that, Includes a base, X-axis stepper slide, Y-axis stepper slide, X-axis stepper motor, Y-axis stepper motor, connecting rod, upper servo cylinder, lower servo cylinder, pulse excitation magnetic head, and pneumatic gripper; The X-axis stepper slide and the Y-axis stepper slide form a cross slide mechanism and are mounted on the base. The X-axis stepper motor drives the X-axis stepper slide to move, and the Y-axis stepper motor drives the Y-axis stepper slide to move. The upper platform of the cross slide mechanism is connected to a connecting rod. The upper servo cylinder and the lower servo cylinder are installed on the head of the connecting rod through a connecting plate and a right-angle connecting plate. Pulse excitation magnetic heads are respectively installed on the upper servo cylinder and the lower servo cylinder. The base is equipped with at least two pneumatic grippers for holding neodymium iron boron magnets.

2. The two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets according to claim 1, characterized in that, Both the X-axis stepping guide slide and the Y-axis stepping guide slide adopt a ball screw drive structure.

3. The two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets according to claim 1, characterized in that, The pulse excitation magnetic head includes a magnetic yoke and a magnetizing coil, wherein the magnetizing coil is made of multiple strands of enameled wire wound in parallel.

4. The two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets according to claim 1, characterized in that, The pneumatic gripper includes a gripper body, a drive cylinder, and an elastic gripping pad. The elastic gripping pad is made of silicone material and has anti-slip texture on its surface.

5. The two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets according to claim 1, characterized in that, It also includes a control system, which is electrically connected to the X-axis stepper motor, Y-axis stepper motor, upper servo cylinder, lower servo cylinder, pulse excitation magnetic head and pneumatic gripper, respectively, and is used to control the coordinated operation of each component.

6. The two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets according to claim 5, characterized in that, The control system includes an industrial computer, a motion control card, and a human-machine interface. The human-machine interface can preset and store a variety of different magnetization graphic programs.

7. The two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets according to claim 1, characterized in that, It also includes a positioning detection device, which includes a CCD camera and an image recognition module, used to identify the edge position and reference point of the neodymium iron boron magnet.

8. The two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets according to claim 1, characterized in that, The connecting rod is a telescopic structure, including an inner rod and an outer rod, which are fixed by locking bolts. The overall length of the adjustable connecting rod is 300-500mm.

9. The two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets according to claim 1, characterized in that, It also includes a cooling system, which includes water-cooled pipes and a cooling fan. The water-cooled pipes are set in close contact with the pulse excitation magnetic head, and the cooling fan is set in correspondence with the servo cylinder and the stepper motor.

10. The two-dimensional dot matrix magnetizer for neodymium iron boron magnetic sheets according to claim 1, characterized in that, The base is made of cast iron and has anti-vibration pads at the bottom. The anti-vibration pads are made of nitrile rubber and are 10-20mm thick.

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