A device and method for welding magnetic alloy on the surface of a flat speaker magnet

Abstract

The present invention provides a device and method for welding magnetic alloy on the surface of a flat-panel speaker magnet, which solves the technical problem of demagnetization of the magnet caused by traditional welding. The device includes a surface processing part, a spraying part, a welding part, a detection part and a conveying part, which are coordinated globally by a control part. The method steps are as follows: first, a femtosecond laser is used to engrave welding holes and heat dissipation grooves on the surface of the magnet to achieve cold processing to prevent demagnetization; secondly, a nickel layer is sprayed to form a metallurgical bonding interface; then, an infrared laser is used to precisely weld the magnetic alloy and the magnet, and the heat dissipation groove quickly dissipates the welding heat; finally, the welding quality is visually inspected. The femtosecond laser cold processing technology fundamentally avoids demagnetization of the magnet; the welding hole positioning + heat dissipation groove design reduces the impact of welding heat by 40%; and the fully automatic process chain increases efficiency by 5 times. This solution significantly improves the consistency of welding strength by >30%, ensuring the stability of the magnetic circuit system performance.

Description

Technical Field

[0001] The present invention relates to the technical field of welding processing, and in particular to a device and a method for welding magnetic conductive alloy on the surface of a flat speaker magnet. Background Art

[0002] As an electroacoustic transducer based on electromagnetic drive principles, the core performance of planar headphones is directly related to the efficiency of the magnetic circuit system. In traditional designs, the permanent magnet array is arranged in a parallel and symmetrical manner, generating an alternating magnetic field on both sides of the diaphragm to drive the conductor layer to vibrate and produce sound. However, this structure has inherent flaws: the magnetic flux lines at the edges of the magnets tend to diffuse into the non-operating area, resulting in a decrease in the magnetic field strength acting on the diaphragm and insufficient spatial uniformity, which in turn affects the consistency of the force applied to the diaphragm.

[0003] To increase the magnetic field strength, higher-magnetic-strength magnets are necessary. However, higher-strength magnets require more expensive rare-earth element-doped magnets. Furthermore, excessively high magnet strength can negatively impact circuit components, affecting both the sound quality and the lifespan of the earphones' electrical components. To address this issue, the present invention proposes adding a high-permeability metal layer to the non-working surface of the permanent magnet array (i.e., the side facing away from the diaphragm).

[0004] The metal layer constrains the diffusion of the magnetic field through the magnetic shielding effect. Its mechanism of action includes two physical processes: (1) utilizing the high magnetic permeability of the soft magnetic material to redirect the magnetic flux lines that originally escaped to the periphery of the magnet to the working air gap area, thereby increasing the effective magnetic flux density (such as Figure 3 (2) By adjusting the spatial distance and geometric shape between the metal layer and the magnet, the uniformity of the magnetic field distribution in the diaphragm plane can be improved (as shown in Figure 3 shown).

[0005] Methods for fixing magnets and magnetic alloys include bonding and welding. The firmness, stability and durability of welding are far greater than those of bonding. However, the heat during welding can cause the magnets to demagnetize. Using traditional welding methods can cause the magnetism of the magnets to decrease or even disappear. Therefore, it is necessary to design an efficient welding method that does not affect the magnetism of the magnets. Summary of the Invention

[0006] In order to solve the above problems, the present invention specifically provides a device for welding magnetic alloy on the surface of a flat speaker magnet, comprising a surface processing unit, a spraying unit, a welding unit, a conveying unit, a detection unit, and a control unit;

[0007] The surface processing section is used to engrave welding holes and heat conduction grooves on the surface of the magnet through a laser engraving process; the spraying section is used to spray a metal layer on the engraved surface of the magnet and place the magnetic alloy on the surface of the magnet; the welding section is used to weld the magnetic alloy and the magnet together through laser welding; the inspection section is used to perform quality inspection on the welded magnet; the conveying section is used to convey the flat-panel speaker magnet from the surface processing section in the order of surface processing section-spraying section-welding section-inspection section; the control section is used to perform global control of the welding process.

[0008] The surface processing portion includes:

[0009] Jig: used to fix the flat speaker magnet to be processed; the jig is installed below the galvanometer system. The jig is a liftable structure. When the flat speaker magnet is transported to the surface processing position, the jig descends and fixes the flat speaker magnet through the jig;

[0010] Femtosecond laser: used to generate a laser beam with an ultrashort pulse width to process the flat speaker magnet fixed on the fixture, carving out solder holes and heat conduction grooves;

[0011] Galvanometer system: arranged in the laser output optical path of the femtosecond laser, comprising a high-speed scanning galvanometer and a focusing lens group, for receiving the laser beam emitted by the femtosecond laser and deflecting the laser beam focal position based on control instructions;

[0012] The control unit controls the output parameters of the femtosecond laser and the scanning path of the galvanometer system so that the laser beam carves the solder point holes and heat conduction grooves;

[0013] The solder holes are blind holes distributed at both ends of the bar magnet. The heat conduction groove is connected to the solder hole, and the depth of the heat conduction groove is less than the depth of the solder hole. The depth of the heat dissipation groove is 1 / 3-1 / 2 of the depth of the solder hole, and the width is 0.1-0.3mm.

[0014] The spraying part includes:

[0015] Mask: used to cover the area on the surface of the flat speaker magnet that does not need to be sprayed;

[0016] Spray head: used to spray a metal layer onto the exposed area of ​​the flat speaker magnet surface after the surface processing part is engraved;

[0017] Robotic arm: used to accurately place the magnetic alloy at the predetermined position on the surface of the flat speaker magnet sprayed with a metal layer.

[0018] The welding portion includes

[0019] Infrared laser: used to generate infrared laser beam required for welding;

[0020] Three-dimensional adjustment arm: used to fix and accurately adjust the three-dimensional position of the welding laser head;

[0021] The control unit controls the output parameters of the infrared laser and the movement of the three-dimensional adjustment arm so that the welding laser beam is aligned with the welding point position to achieve welding of the two.

[0022] The detection unit includes:

[0023] Camera: used to obtain an image of the bonding area between the magnetic alloy and the flat speaker magnet after welding; the control unit processes the image obtained by the camera to detect the welding quality;

[0024] The conveying unit includes:

[0025] Precision conveyor belt: used to automatically transport the flat speaker magnet between the surface processing part, spraying part, welding part and detection part; the control part controls the start, stop, speed and positioning of the precision conveyor belt.

[0026] The magnet is in the shape of a quadrangular prism, the magnetic alloy is in the shape of a sheet, and the cross-section of the magnetic alloy is C-shaped; when the magnetic alloy is welded to the magnet, the magnetic alloy contacts the three adjacent non-end faces of the magnet, and the area covered by the magnetic alloy on the two opposite faces of the magnet in contact with the magnetic alloy exceeds 70% of its surface.

[0027] A method for welding a magnetic alloy on the surface of a flat speaker magnet, using the magnetic alloy welding device for welding a magnetic alloy on the surface of a flat speaker magnet, comprises the following steps:

[0028] S1. Surface processing: Use the surface processing unit to carve solder holes and heat conduction grooves on the surface of the flat speaker magnet;

[0029] S2. Spraying: Use the spraying unit to spray a metal layer on the surface of the engraved magnet and place the magnetic alloy at the predetermined position;

[0030] S3, laser welding: using the welding part to weld the magnetic alloy and the magnet at the welding point hole;

[0031] S4. Quality inspection: Use the inspection department to inspect the welded parts;

[0032] S5. Output: Output qualified products or unqualified products according to the test results;

[0033] The flat speaker magnet is automatically transported through the conveying unit between steps S1 to S4.

[0034] The step S1 specifically includes:

[0035] The flat speaker magnet is transported to the surface processing department via a precision conveyor belt and fixed by a jig;

[0036] The femtosecond laser is controlled to output ultrashort pulse laser, and the laser focus scanning path is controlled by the galvanometer system to carve solder hole and heat conduction groove on the top surface of the magnet.

[0037] The step S2 specifically includes:

[0038] The precise conveyor belt positions the engraved magnets at the spraying area, controlling the mask to cover the non-spraying area on the magnet surface.

[0039] Control the nozzle to spray and form a metal layer on the exposed area of ​​the magnet; the metal layer is nickel, and the working temperature of the nickel plating is: 65℃±5℃;

[0040] The robotic arm is controlled to grab a C-shaped magnetic alloy sheet and accurately place it on the surface of the magnet sprayed with a metal layer, so that the magnetic alloy sheet covers the three adjacent non-end faces of the magnet, and the coverage area of ​​the two opposite surfaces of the magnet in contact with the magnetic alloy sheet exceeds 70% of its surface.

[0041] The step S3 specifically includes:

[0042] The control unit controls the infrared laser to output the welding laser beam; the three-dimensional adjustment arm precisely adjusts the spatial position and angle of the welding laser head to focus the laser beam on the weld hole; the laser welding is started, and the magnetic alloy sheet and the magnet are melted and connected into one at the weld hole through the metal layer; after the welding is completed, the precision conveyor belt transports the component to the inspection unit; during the welding process, the heat at the weld point is quickly dissipated through the heat conduction groove to prevent heat concentration from affecting the magnet's magnetic properties;

[0043] Step S4 specifically includes:

[0044] The welded parts are transported to the inspection department and positioned; the camera is controlled to obtain an image of the bonding area between the magnetic alloy sheet and the magnet; the control department processes the image, detects the weld morphology, and determines whether the welding quality is qualified based on the weld morphology.

[0045] The beneficial effects of the present invention are:

[0046] The surface processing department adopts femtosecond laser ultrafast cold processing technology. The ultrashort pulse (femtosecond level) high peak power laser instantly vaporizes the material. During the process of engraving solder holes and heat conduction grooves, the heat does not have time to be transferred to the interior of the magnet. This fundamentally avoids the problem of heating and demagnetization of the magnet caused by traditional laser processing, and ensures the integrity of the magnetic material performance.

[0047] Spraying a metal layer to form a metallurgical medium: Precisely spraying a metal layer on the surface of the magnet provides a highly active metallurgical bonding interface between the magnetic alloy and the magnet, significantly reducing the interfacial thermal resistance and improving the wettability and bonding strength of the laser welding molten pool; Precise positioning welding of the weld spot holes: The weld spot holes engraved by femtoseconds serve as the welding position reference, guiding the laser beam to accurately act on the alloy-magnet interface, avoiding false welds caused by offset, and improving the consistency of welding strength by >30%.

[0048] The heat conduction grooves preset on the magnet surface form efficient heat diffusion channels during the welding process, which quickly conduct the instantaneous high temperature in the welding zone away from the core welding area of ​​the magnet, reducing the peak temperature of the welding heat-affected zone by more than 40%, and completely avoiding the degradation of the magnet's magnetic domain structure caused by local high temperature.

[0049] High-resolution cameras perform millisecond-level image analysis of weld topography and weld point location, enabling real-time rejection of defective welds. Combined with a fully automated process chain encompassing femtosecond cold working, metal spraying, infrared laser welding, and online visual inspection, the processing cycle for a single magnet is reduced to one-fifth that of traditional processes. Furthermore, the magnets are transferred "contactlessly" (automatically by the conveyor), eliminating damage caused by human error. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0051] Attachment Figure 1 Schematic diagram of the appearance of the welding device of the present invention;

[0052] Attachment Figure 2 This is a schematic diagram of the sound unit structure of the flat headphone of the present invention;

[0053] Attachment Figure 3 is a magnetic field distribution diagram of the magnet of the present invention;

[0054] Attachment Figure 4 This is a schematic diagram of the welding process of the present invention;

[0055] Attachment Figure 5 This is a schematic diagram of the magnet processing structure of the present invention;

[0056] Attachment Figure 6 Schematic diagram of the device architecture of the present invention.

[0057] Among them: 1 magnet, 2 magnetic alloy, 3 frame, 4 diaphragm, 5 surface processing part, 6 spraying part, 7 welding part, 8 detection part, 11 soldering point hole, 12 heat conduction groove. DETAILED DESCRIPTION

[0058] Example 1:

[0059] See also Figures 1 to 6 The present invention provides a device for welding a magnetic alloy 2 on the surface of a flat speaker magnet 1, comprising a surface processing unit 5, a spraying unit 6, a welding unit 7, a conveying unit, a detection unit 8 and a control unit;

[0060] The surface processing part 5 is used to engrave welding point holes 11 and heat conduction grooves 12 on the surface of the magnet 1 through a laser engraving process; the spraying part 6 is used to spray a metal layer on the surface of the engraved magnet 1 and place the magnetic alloy 2 on the surface of the magnet 1; the welding part 7 is used to weld the magnetic alloy 2 and the magnet 1 together through laser welding; the detection part 8 is used to perform quality inspection on the magnet 1 after welding; the conveying part is used to convey the flat speaker magnet 1 from the surface processing part 5 in the order of surface processing part 5-spraying part 6-welding part 7-detection part 8; the control part is used to perform global control of the welding process.

[0061] The surface processing portion includes:

[0062] Jig: used to fix the flat speaker magnet 1 to be processed; the jig is installed below the galvanometer system and is a liftable structure. When the flat speaker magnet is transported to the surface processing position, the jig descends and fixes the flat speaker magnet through the jig;

[0063] Femtosecond laser: used to generate a laser beam with an ultrashort pulse width to process the flat speaker magnet fixed on the fixture, carving out the solder hole 11 and the heat conduction groove 12;

[0064] Galvanometer system: arranged in the laser output optical path of the femtosecond laser, comprising a high-speed scanning galvanometer and a focusing lens group, for receiving the laser beam emitted by the femtosecond laser and deflecting the laser beam focal position based on control instructions;

[0065] The control unit controls the output parameters of the femtosecond laser and the scanning path of the galvanometer system so that the laser beam carves the solder point holes and heat conduction grooves;

[0066] The soldering point holes are blind holes distributed at both ends of the bar magnet. The heat conduction groove is connected to the soldering point holes, and the depth of the heat conduction groove is smaller than the depth of the soldering point holes.

[0067] The spraying part includes:

[0068] Mask: used to cover the area on the surface of the flat speaker magnet that does not need to be sprayed;

[0069] Spray head: used to spray a metal layer onto the exposed area of ​​the flat speaker magnet surface after the surface processing part is engraved;

[0070] Robotic arm: used to accurately place the magnetic alloy at the predetermined position on the surface of the flat speaker magnet sprayed with a metal layer.

[0071] The welding portion includes

[0072] Infrared laser: used to generate infrared laser beam required for welding;

[0073] Three-dimensional adjustment arm: used to fix and accurately adjust the three-dimensional position of the welding laser head;

[0074] The control unit controls the output parameters of the infrared laser and the movement of the three-dimensional adjustment arm so that the welding laser beam is aligned with the welding point position to achieve welding of the two.

[0075] The detection unit includes:

[0076] Camera: used to obtain an image of the bonding area between the magnetic alloy and the flat speaker magnet after welding; the control unit processes the image obtained by the camera to detect the welding quality;

[0077] The conveying unit includes:

[0078] Precision conveyor belt: used to automatically transport the flat speaker magnet between the surface processing part, spraying part, welding part and detection part; the control part controls the start, stop, speed and positioning of the precision conveyor belt.

[0079] The magnet is in the shape of a quadrangular prism, the magnetic alloy is in the shape of a sheet, and the cross-section of the magnetic alloy is C-shaped; when the magnetic alloy is welded to the magnet, the magnetic alloy contacts the three adjacent non-end faces of the magnet, and the area covered by the magnetic alloy on the two opposite faces of the magnet in contact with the magnetic alloy exceeds 70% of its surface.

[0080] Theoretical analysis and preliminary experiments indicate that this structural improvement may bring three advantages: first, the enhanced magnetic flux density can improve the linearity of the electromagnetic driving force and diaphragm displacement, helping to reduce nonlinear distortion under large signals; second, a more uniform magnetic field distribution can reduce local stress concentration on the diaphragm and improve phase consistency in the high-frequency band; finally, constrained magnetic field diffusion can reduce the impact of external electromagnetic interference on sensitive circuits.

[0081] While maintaining the original magnet volume, using a 0.3mm thick soft magnetic alloy layer can increase the average magnetic induction intensity in the diaphragm area by approximately 18% (measured using a gaussmeter), and the field intensity gradient at the pole edges is significantly reduced (finite element simulation shows that the unevenness has improved from ±12% to ±7%). Improving transduction efficiency through structural innovation rather than simply increasing the magnet volume has potential implications for equipment lightweighting and cost control.

[0082] Example 2:

[0083] See also Figure 3 A method for welding a magnetic alloy on the surface of a flat speaker magnet, using the magnetic alloy welding device on the surface of a flat speaker magnet, comprises the following steps:

[0084] S1. Surface processing: Use the surface processing unit to carve solder holes and heat conduction grooves on the surface of the flat speaker magnet;

[0085] S2. Spraying: Use the spraying unit to spray a metal layer on the surface of the engraved magnet and place the magnetic alloy at the predetermined position;

[0086] S3, laser welding: using the welding part to weld the magnetic alloy and the magnet at the welding point hole;

[0087] S4. Quality inspection: Use the inspection department to inspect the welded parts;

[0088] S5. Output: Output qualified products or unqualified products according to the test results;

[0089] The flat speaker magnet is automatically transported through the conveying unit between steps S1 to S4.

[0090] The step S1 specifically includes:

[0091] The flat speaker magnet is transported to the surface processing department via a precision conveyor belt and fixed by a jig;

[0092] The femtosecond laser is controlled to output ultrashort pulse laser, and the laser focus scanning path is controlled by the galvanometer system to carve solder hole and heat conduction groove on the top surface of the magnet.

[0093] The step S2 specifically includes:

[0094] The precise conveyor belt positions the engraved magnets at the spraying area, controlling the mask to cover the non-spraying area on the magnet surface.

[0095] Control the nozzle to spray and form a metal layer on the exposed area of ​​the magnet; the metal layer is nickel, and the working temperature of the nickel plating is: 65℃±5℃;

[0096] The robotic arm is controlled to grab a C-shaped magnetic alloy sheet and accurately place it on the surface of the magnet sprayed with a metal layer, so that the magnetic alloy sheet covers the three adjacent non-end faces of the magnet, and the coverage area of ​​the two opposite surfaces of the magnet in contact with the magnetic alloy sheet exceeds 70% of its surface.

[0097] Core process conditions for spray nickel plating:

[0098] Temperature requirements

[0099] Bath temperature: Must be heated to 65°C ± 5°C. Otherwise, the reduction reaction cannot be effectively activated, resulting in poor coating adhesion or deposition failure. Ambient temperature: The operating environment must be kept stable to avoid temperature fluctuations that affect bath activity. Additional heating equipment is required for low-temperature environments.

[0100] Plating solution preparation and ingredients:

[0101] Formula ratio: Nickel spraying water consists of two parts, A and B, mixed at the ratio of A:B:water = 1:2:7;

[0102] Agent A: Contains nickel salt (such as nickel sulfate) and stabilizer;

[0103] Agent B: reducing agent (such as sodium hypophosphite), pH buffer.

[0104] Spray equipment: corrosion-resistant spray gun, continuous and uniform spraying;

[0105] Time control: single spraying ≥ 5 minutes, multi-layer spraying can thicken the coating.

[0106] Selection of magnetic alloy:

[0107] Element: .

[0108] Performance indicators:

[0109] Magnetic permeability (μ): effective value of 31,300, which can effectively guide the magnetic flux lines; saturation magnetic flux density ( ): 1.83 T; coercivity (H): as low as 1.1 A / m; high-frequency loss: 0.05–0.09 W / kg (@1 kHz).

[0110] The step S3 specifically includes:

[0111] The control unit controls the infrared laser to output the welding laser beam; the three-dimensional adjustment arm precisely adjusts the spatial position and angle of the welding laser head to focus the laser beam on the weld hole; the laser welding is started, and the magnetic alloy sheet and the magnet are melted and connected into one at the weld hole through the metal layer; after the welding is completed, the precision conveyor belt transports the component to the inspection unit; during the welding process, the heat at the weld point is quickly dissipated through the heat conduction groove to prevent heat concentration from affecting the magnet's magnetic properties;

[0112] Step S4 specifically includes:

[0113] The welded parts are transported to the inspection department and positioned; the camera is controlled to obtain an image of the bonding area between the magnetic alloy sheet and the magnet; the control department processes the image, detects the weld morphology, and determines whether the welding quality is qualified based on the weld morphology.

[0114] Thus far, the description of the above-described embodiments has been provided for the purpose of illustration and description. It is not intended to be exhaustive or to limit the present disclosure. The individual elements or features of a particular embodiment are generally not limited to the particular embodiment, but when applicable, they can be interchanged and used for selected embodiments even if not specifically shown or described. In many aspects, the same elements or features can also be changed. Such changes are not considered to depart from the present disclosure, and all such modifications are intended to be included within the scope of the present disclosure.

[0115] Example embodiments are provided so that the present disclosure will be thorough and will fully convey the scope to those skilled in the art. In order to thoroughly understand the embodiments of the present disclosure, numerous details are set forth, such as examples of specific parts, devices, and methods. It will be apparent to those skilled in the art that specific details need not be used, and the example embodiments may be implemented in many different forms, and neither should be construed as limiting the scope of the present disclosure. In certain example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.

[0116] Here, professional vocabulary is used only for the purpose of describing specific example embodiments and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a" and "the" used herein may be intended to include the plural forms as well. The terms "including" and "having" are inclusive and therefore specify the presence of the claimed features, wholes, steps, operations, elements and / or components, but do not exclude the presence or additional presence of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof. Unless the order of execution is explicitly indicated, the method steps, processes and operations described herein are not to be interpreted as necessarily needing to be performed in the specific order discussed and shown. It should also be understood that additional or optional steps may be adopted.

Claims

1. A method for welding a magnetic alloy on the surface of a flat speaker magnet, using a magnetic alloy welding device for welding a magnetic alloy on the surface of a flat speaker magnet, characterized in that: The magnetic alloy welding device for the surface of a flat speaker magnet includes a surface processing part, a spraying part, a welding part, a conveying part, a detection part and a control part; The surface processing unit is used to carve solder joint holes and heat conduction grooves on the surface of the magnet through laser engraving technology. The spraying unit is used to spray the metal layer on the engraved magnet surface and place the magnetic alloy on the magnet surface. The welding section is used to weld the magnetic alloy and the magnet together through laser welding; the inspection section is used to perform quality inspection on the welded magnet; the conveying section is used to convey the flat speaker magnet from the surface processing section in the order of surface processing section - spraying section - welding section - inspection section; the control section is used to perform global control of the welding process; The welding method includes the following steps: S1. Surface processing: Use the surface processing unit to carve solder holes and heat conduction grooves on the surface of the flat speaker magnet; S2. Spraying: Use the spraying unit to spray a metal layer on the surface of the engraved magnet and place the magnetic alloy at the predetermined position; S3, laser welding: using the welding part to weld the magnetic alloy and the magnet at the welding point hole; S4. Quality inspection: Use the inspection department to inspect the welded parts; S5. Output: Output qualified products or unqualified products according to the test results; The flat speaker magnet is automatically transported through the conveying unit between steps S1 to S4; A metal layer is precisely sprayed on the surface of the magnet to provide a highly active metallurgical bonding interface between the magnetic alloy and the magnet. The weld hole engraved by femtosecond engraving serves as a welding position reference, guiding the laser beam to act precisely on the alloy-magnet interface to avoid false welds caused by offset. The preset heat conduction grooves on the surface of the magnet form an efficient heat diffusion channel during the welding process, quickly conducting the instantaneous high temperature in the welding area away from the core welding area of ​​the magnet.

2. The method for welding magnetic alloy on the surface of a flat speaker magnet according to claim 1, characterized in that: The surface processing portion includes: Jig: used to fix the flat speaker magnet to be processed; the jig is installed below the galvanometer system. The jig is a liftable structure. When the flat speaker magnet is transported to the surface processing position, the jig descends and fixes the flat speaker magnet through the jig; Femtosecond laser: used to generate a laser beam with an ultrashort pulse width to process the flat speaker magnet fixed on the fixture, carving out solder holes and heat conduction grooves; Galvanometer system: arranged in the laser output optical path of the femtosecond laser, comprising a high-speed scanning galvanometer and a focusing lens group, for receiving the laser beam emitted by the femtosecond laser and deflecting the laser beam focal position based on control instructions; The control unit controls the output parameters of the femtosecond laser and the scanning path of the galvanometer system so that the laser beam carves the solder point holes and heat conduction grooves; The soldering point holes are blind holes distributed at both ends of the bar magnet. The heat conduction groove is connected to the soldering point holes, and the depth of the heat conduction groove is smaller than the depth of the soldering point holes.

3. The method for welding magnetic alloy on the surface of a flat speaker magnet according to claim 1 or 2, characterized in that: The spraying part includes: Mask: used to cover the area on the surface of the flat speaker magnet that does not need to be sprayed; Spray head: used to spray a metal layer onto the exposed area of ​​the flat speaker magnet surface after the surface processing part is engraved; Robotic arm: used to accurately place the magnetic alloy at the predetermined position on the surface of the flat speaker magnet sprayed with a metal layer.

4. The method for welding magnetic alloy on the surface of a flat speaker magnet according to claim 1 or 2, characterized in that: The welding portion includes Infrared laser: used to generate infrared laser beam required for welding; Three-dimensional adjustment arm: used to fix and accurately adjust the three-dimensional position of the welding laser head; The control unit controls the output parameters of the infrared laser and the movement of the three-dimensional adjustment arm so that the welding laser beam is aligned with the welding point position to achieve welding of the two.

5. The method for welding magnetic alloy on the surface of a flat speaker magnet according to claim 1 or 2, characterized in that: The detection unit includes: Camera: used to obtain an image of the bonding area between the magnetic alloy and the flat speaker magnet after welding; the control unit processes the image obtained by the camera to detect the welding quality; The conveying unit includes: Precision conveyor belt: used to automatically transport the flat speaker magnet between the surface processing part, spraying part, welding part and detection part; the control part controls the start, stop, speed and positioning of the precision conveyor belt.

6. The method for welding magnetic alloy on the surface of a flat speaker magnet according to claim 1, characterized in that: The magnet is in the shape of a quadrangular prism, the magnetic alloy is in the shape of a sheet, and the cross-section of the magnetic alloy is C-shaped; when the magnetic alloy is welded to the magnet, the magnetic alloy contacts the three adjacent non-end faces of the magnet, and the area covered by the magnetic alloy on the two opposite faces of the magnet in contact with the magnetic alloy exceeds 70% of its surface.

7. The method for welding magnetic alloy on the surface of a flat speaker magnet according to claim 1, characterized in that: The step S1 specifically includes: The flat speaker magnet is transported to the surface processing department via a precision conveyor belt and fixed by a jig; The femtosecond laser is controlled to output ultrashort pulse laser, and the laser focus scanning path is controlled by the galvanometer system to carve solder hole and heat conduction groove on the top surface of the magnet.

8. The method for welding magnetic alloy on the surface of a flat speaker magnet according to claim 1, characterized in that: The step S2 specifically includes: The precise conveyor belt positions the engraved magnets at the spraying area, controlling the mask to cover the non-spraying area on the magnet surface. Control the nozzle to spray and form a metal layer on the exposed area of ​​the magnet; the metal layer is nickel, and the working temperature of the nickel plating is: 65℃±5℃; The robotic arm is controlled to grab a C-shaped magnetic alloy sheet and accurately place it on the surface of the magnet sprayed with a metal layer, so that the magnetic alloy sheet covers the three adjacent non-end faces of the magnet, and the coverage area of ​​the two opposite surfaces of the magnet in contact with the magnetic alloy sheet exceeds 70% of its surface.

9. The method for welding magnetic alloy on the surface of a flat speaker magnet according to claim 1, characterized in that: The step S3 specifically includes: The control unit controls the infrared laser to output the welding laser beam; the three-dimensional adjustment arm precisely adjusts the spatial position and angle of the welding laser head to focus the laser beam on the weld hole; the laser welding is started, and the magnetic alloy sheet and the magnet are melted and connected into one at the weld hole through the metal layer; after the welding is completed, the precision conveyor belt transports the component to the inspection unit; during the welding process, the heat at the weld point is quickly dissipated through the heat conduction groove to prevent heat concentration from affecting the magnet's magnetic properties; Step S4 specifically includes: The welded parts are transported to the inspection department and positioned; the camera is controlled to obtain an image of the bonding area between the magnetic alloy sheet and the magnet; the control department processes the image, detects the weld morphology, and determines whether the welding quality is qualified based on the weld morphology.

Images