Neodymium-iron-boron shielding case CNC laser production system and production process

Abstract

The invention relates to the technical field of magnet shielding, and particularly discloses a CNC laser production system and a CNC laser production process for a neodymium iron boron shielding case. The system comprises a numerical control milling machine and laser processing equipment used in cooperation with the numerical control milling machine. The numerical control milling machine comprises a first workbench, a milling cutter arranged above the first workbench, a driving device used for driving the milling cutter to mill a groove in a workpiece to be machined and a control unit connected with the driving device. A blind groove formed by cutting of the milling cutter is used for containing the neodymium-iron-boron magnet. The laser machining equipment comprises a second workbench, a laser generator arranged above the second workbench and a laser cutting system used for controlling the laser generator to cut a workpiece to be machined on the second workbench. The laser cutting system is used for generating a cutting path of the laser generator according to the shape and the position of the blind groove and controlling the laser generator to generate laser beams according to the cutting path to annularly cut and fuse the sheet along the edge of the blind groove so as to form the shielding case with the blind groove.

Description

Technical Field

[0001] The invention relates to the technical field of magnet shielding cover manufacturing, and in particular discloses a CNC laser production system and a production process for a NdFeB shielding cover. Background Art

[0002] High magnetic energy products made of NdFeB magnets are widely used in motors, sensors, headphones and other fields. However, with the application of high-performance NdFeB magnets, people have found that they have serious electromagnetic interference problems, so it is particularly important to effectively shield them. Traditional shielding methods usually use metal materials such as copper and aluminum to make shielding covers through stamping, injection molding and other processing processes. However, its production process is complicated, the cost is high, and the processing accuracy is low. Summary of the invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a NdFeB shielding cover CNC laser production system and production process to solve the technical problems of complex shielding cover processing, high cost and low processing accuracy in the prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides a CNC laser production system for a NdFeB shielding cover, comprising a CNC milling machine and a laser processing device used in conjunction with the CNC milling machine, wherein the CNC milling machine comprises a first workbench for carrying a workpiece to be processed, a milling cutter movably arranged above the first workbench, a driving device for driving the milling cutter to mill grooves on the workpiece to be processed, and a control unit connected to the driving device; the control unit is used to control the driving device to drive the milling cutter to mill grooves on the workpiece to be processed on the workbench to form a blind groove, and the blind groove is used to accommodate external NdFeB magnets.

[0005] The laser processing equipment includes a second workbench for carrying the workpiece to be processed after being processed by a CNC milling machine, a laser generator arranged above the second workbench, and a laser cutting system for controlling the laser generator to cut the workpiece to be processed on the second workbench; the laser cutting system is used to design and generate a cutting path for the laser generator according to the shape and position of the blind groove, and control the laser generator to generate a laser beam to cut the fuse sheet along the edge of the blind groove according to the cutting path to form a shielding cover with a blind groove.

[0006] Furthermore, the NdFeB shielding cover CNC laser production system also includes a striping and slicing machine, which includes an unwinding device, a tensioning device, a first cutter movably arranged relative to the tensioning device, and a first driving member connected to the first cutter; the unwinding device is used to unwind the external coil to the tensioning device for flattening and tightening, and the first driving member is used to drive the first cutter to cut the coil flattened and tightened by the flattening device into strip sheets;

[0007] The strip slicing machine also includes a supporting platform arranged at the end of the tensioning device, a second cutter movably arranged relative to the supporting platform, and a second driving member connected to the second cutter; the cutting direction of the first cutter and the cutting direction of the second cutter are arranged to cross each other, the supporting platform is used to convey the strip sheet to the first cutter, and the second driving member is used to drive the second cutter to cut the strip sheet conveyed by the supporting platform to form the workpiece to be processed.

[0008] Furthermore, a flattening mechanism is provided on the supporting platform, and the tensioning device is used to increase the tensioning force of the material strip released by the unwinding device. The flattening mechanism has a first flat plate member for moving relative to the supporting platform, and a second screw module for driving the first flat plate member to approach or move away from the supporting platform. The first flat plate member is used to flatten the material strip carried by the supporting platform, and the second cutter is used to cut the strip sheet processed by the flattening mechanism.

[0009] Furthermore, the workpiece to be processed is made of one or more combinations of iron, nickel, and cobalt, or is made of superconducting materials.

[0010] Furthermore, the CNC laser production system also includes a grinding device, which includes a base, a vibration motor disposed on the base, and a storage bin disposed on the vibration motor; the storage bin is provided with an abrasive for grinding the surface of the shielding cover, and the vibration motor is used to drive the storage bin to vibrate so that the abrasive grinds the outer surface of the shielding cover and the inner groove surface of the blind groove in the storage bin. The storage bin is also provided with a first discharge piece, which is used to transport the polished shielding cover in the storage bin to the next process.

[0011] Furthermore, the CNC laser production system also includes an electroplating device, which includes an electroplating tank for containing electrolyte and shielding cover, a cathode clamp, an anode clamp and a power module; the cathode clamp is used to fix the shielding cover in the electroplating tank, and the anode clamp is used to set the external anode material in the electroplating tank, and the positive and negative terminals of the power module are respectively connected to the cathode clamp and the anode clamp via wires.

[0012] A CNC laser production process for a NdFeB shielding cover comprises the following steps:

[0013] S1. Pretreatment: Provide the workpiece to be processed made of magnetic conductive material and perform preliminary shaping treatment on the workpiece;

[0014] S2, CNC slot milling: placing the workpiece to be processed obtained in step S1 on the first workbench of a CNC milling machine, using the processing system of the CNC milling machine to compile a processing program according to the shape and size of the workpiece to be processed and the required blind slot, and the control unit of the CNC milling machine controls the preset milling cutter on the CNC milling machine to perform slot milling on the workpiece to be processed on the first workbench according to the processing program, so that a blind slot is formed on the workpiece to be processed, and the blind slot is used to accommodate the NdFeB magnet;

[0015] S3, laser cutting: the workpiece with the blind groove is transferred to the second workbench of the laser processing equipment, and the laser cutting system in the laser processing equipment draws the processing outline of the required shielding cover according to the shape and size of the workpiece and the blind groove and generates a cutting code; the laser cutting system controls the laser generator of the laser processing equipment to generate a laser beam according to the cutting code to laser cut the workpiece on the second workbench to obtain the shielding cover with the blind groove;

[0016] S4, post-processing: post-processing the shielding cover obtained in step S3, wherein the post-processing includes surface treatment and external dimension detection of the shielding cover. The shielding cover after post-processing enters the next process.

[0017] Furthermore, the thickness of the workpiece to be processed obtained in step 1 is 0.5-5 mm.

[0018] Furthermore, the CNC slot milling of step S2 includes the following steps:

[0019] (a) installing a positioning fixture on the first workbench of the CNC milling machine according to the size of the workpiece to be processed, and using the positioning fixture to stably limit the workpiece to be processed on the workbench of the CNC milling machine;

[0020] (b) setting the processing parameters of the milling path, feed rate and rotation speed of the milling cutter according to the outer dimensions of the workpiece to be processed and the required blind groove through the control unit of the CNC milling machine;

[0021] (c) During the process of milling the blind groove, the workpiece on the workbench is kept at a preset low temperature by using a coolant, and the coolant is sprayed onto the surface of the workpiece by means of a booster pump to form a protective mist to reduce the thermal impact of the milling cutter during cutting;

[0022] (d) Using a control unit of a numerically controlled milling machine to control a milling cutter to perform milling processing on the workpiece to be processed on the first workbench according to the processing parameters in step (b) to form a blind groove on the workpiece to be processed.

[0023] Furthermore, the CNC slot milling step (d) further comprises the following steps:

[0024] (1) using a control unit of a CNC milling machine to control a milling cutter to perform reciprocating rough machining on a workpiece according to set machining parameters of a milling path, a feed rate, and a rotation speed;

[0025] (2) using a control unit of a numerically controlled milling machine to control a milling cutter according to the processing parameters to perform circular cutting on the workpiece to be processed after rough processing to form a blind groove prototype;

[0026] (3) Using the control unit of the CNC milling machine to control the milling cutter to perform radius compensation cutting on the blind groove formed after the annular cutting according to the processing parameters, finally forming a blind groove for accommodating the external NdFeB.

[0027] Furthermore, the surface treatment in step S4 includes the following steps:

[0028] (1) Polishing: placing the shielding cover obtained in step S3 into a polishing machine for polishing the outer surface and polishing the inner groove surface of the blind groove;

[0029] (2) Electroplating: The shield cover after surface grinding is placed in an electroplating device for surface coating treatment, wherein the coating includes one or more of zinc, nickel, copper, aluminum, and ceramic.

[0030] Furthermore, in step S3, the laser cutting system is connected to a main control computer, and the main control computer controls the laser generator through the laser cutting system to laser cut the workpiece processed in step S2, and a scanning device connected to the laser cutting system is provided on one side of the laser generator;

[0031] The scanning device is used to write the contour dimensions of the workpiece to be processed and the blind groove in step S2 into the main control computer via the laser cutting system to generate a master drawing. The main control computer draws the processing contour based on the master drawing to generate a cutting preview image. The laser cutting system generates a cutting code based on the cutting preview image and controls the laser generator to cut the workpiece to be processed through the cutting code to produce a shielding cover.

[0032] Beneficial effects of the present invention: The CNC laser production system for NdFeB shielding covers realizes the precise manufacturing of NdFeB shielding covers by combining CNC milling machines with laser processing equipment. First, the system uses a CNC milling machine to perform milling processing on the workpiece to be processed to form a blind groove for accommodating NdFeB magnets. Then, the sheet is precisely cut along the edge of the blind groove according to a preset cutting path by laser processing equipment, and finally a shielding cover that meets the predetermined shape and size is obtained. Finally, the prepared shielding cover is polished and electroplated. The entire production process is highly automated by the control unit and the laser cutting system. Through the collaborative work of programming and control systems, each process is sequentially connected and seamlessly connected, which improves the integration and accuracy of production. The shielding cover after polishing and electroplating has better electromagnetic shielding effect and mechanical strength, meets high performance requirements, and is particularly suitable for the assembly of NdFeB magnets in harsh working environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the CNC milling machine of the present invention;

[0034] Figure 2 It is a structural schematic diagram of the laser processing equipment of the present invention;

[0035] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of part A;

[0036] Figure 4 It is a schematic diagram of the overall structure of the slitting and slicing machine of the present invention;

[0037] Figure 5 It is a partial structural schematic diagram of the slitting and slicing machine of the present invention;

[0038] Figure 6 It is a production flow chart of the CNC production process of the NdFeB shielding cover of the present invention;

[0039] Figure 7 It is a schematic structural diagram of the grinding device of the present invention;

[0040] Figure 8 It is a schematic structural diagram of the electroplating tank of the present invention;

[0041] Fig. 9 It is a schematic diagram of the structure of the workpiece to be processed by the CNC milling machine of the present invention;

[0042] Fig.10 It is a schematic diagram of the finished product of the NdFeB shielding cover of the present invention.

[0043] Reference numerals include:

[0044] 1. CNC milling machine; 2. Laser processing equipment; 3. Slitting machine; 4. Grinding device; 5. Electroplating device; 6. Shielding cover; 61. Blind groove; 7. Coil; 8. Strip sheet; 9. Workpiece to be processed; 10. Control unit; 11. First workbench; 12. Drive device; 121. First screw module; 122. Slide; 13. Milling cutter; 14. Positioning fixture; 21. Second workbench; 22. Laser cutting system; 23. Laser generator; 24. Coolant storage Storage tank; 25. Cooling nozzle; 31. Unwinding device; 32. Tensioning device; 33. First driving member; 34. First cutter; 35. Support platform; 36. Second driving member; 361. Second motor; 362. Cam-link mechanism; 37. Second cutter; 41. Base; 42. Vibration motor; 43. Storage bin; 431. First discharging member; 51. Plating tank; 52. Cathode fixture; 53. Anode fixture; 54. Power module; 55. Electrolyte circulation unit. DETAILED DESCRIPTION

[0045] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0046] See also Figures 1 to 10As shown, a CNC laser production system for NdFeB shielding covers of the present invention, a CNC milling machine 1 and a laser processing device 2 work together to realize the production of NdFeB shielding covers. First, the first workbench 11 of the CNC milling machine 1 carries the workpiece 9 to be processed, and the control unit 10 controls the milling cutter 13 to perform milling along the surface of the sheet according to a preset program to form a blind groove 61 of precise size for accommodating NdFeB magnets. During the milling process, the driving device 12 is composed of two groups of cross-arranged first screw modules 121 and a slide 122. The milling cutter 13 is arranged on the slide 122. The two first screw modules 121 respectively drive the milling cutter 13 on the slide 122 to feed along the X and Z axes. The driving device 12 provides precise feeding and rotation speed to ensure processing accuracy. At the same time, the processing surface is protected by cooling liquid spray to reduce thermal effects. After the milling is completed, the sheet is transferred to the second workbench 21 of the laser processing equipment 2. The laser cutting path is designed and generated by the laser cutting system. The laser generator 23 performs circular cutting along the edge of the blind groove 61 according to the generated path, and finally forms a shielding cover 6 with a blind groove 61.

[0047] The laser processing equipment 2 and the CNC milling machine 1 work together through the control unit 10 and the laser cutting system. The CNC milling machine is responsible for precise machining, and the laser processing equipment 2 provides high-precision cutting capabilities, and the two are closely connected. In this embodiment, the laser processing equipment 2 is provided with a matching cooling device, which includes a coolant storage tank 24, a cooling pump (not shown in the figure) and a cooling nozzle 25. When in use, the laser cutting system will control the cooling pump to continuously spray the coolant in the coolant storage tank 24 through the cooling nozzle 25 to the second workbench 21 to cooperate with the laser sounder for cutting operations. In actual use, the system can also add automatic loading and unloading devices to further improve production efficiency. During the production process, the laser cutting system can detect the size of the workpiece through a scanning device to ensure that the laser cutting and milling processing are accurately matched and reduce errors.

[0048] Through the combination of the control unit 10 and the laser cutting equipment, the system can achieve high-precision processing of the shielding cover 6, ensure that the shape and size of the blind groove 61 meet the requirements of the NdFeB magnet, and reduce dimensional deviation. This solution realizes the automated coordination of the CNC milling machine 1 and the laser processing equipment 2, reduces manual intervention, and greatly improves production efficiency. Combined with the scanning device and the automatic loading and unloading device, the production process can be further optimized, ensuring that each process is closely connected and improving the overall processing speed.

[0049] Specifically, the NdFeB shield CNC laser production system is further combined with a striping slicer 3, which is used to cut the coil 7 into sheets to be processed. First, the unwinding device 31 unfolds the external coil 7, and flattens and tightens the coil 7 through the tensioning device 32 (composed of multiple tensioning rollers arranged at intervals), ensuring that the coil 7 is flat and does not shift during the cutting process. Then, the first driving member 33 controls the first cutter 34 to cut along the length direction of the coil 7 to form a strip sheet 8. The strip sheet 8 is transferred to the second cutter 37 through the carrier 35, and the second driving member 36 controls the second cutter 37 to cut the strip sheet 8 in a direction intersecting with the first cutter 34 to generate a workpiece 9 to be processed that meets the size requirements.

[0050] In this embodiment, the first driving member 33 includes a first motor and a load-bearing roller connected to the output shaft of the first motor. The first cutter 34 is composed of an extrusion roller and multiple blades thereon. A plurality of air avoidance grooves are provided above the load-bearing roller. The air avoidance grooves are used to accommodate the blades of the first cutter 34. The load-bearing roller and the extrusion roller are connected by gear meshing. The coil 7 flattened by the tensioning device 32 is clamped by the extrusion roller and the load-bearing roller. The first motor drives the extrusion roller to rotate via the load-bearing roller; thereby, the first cutter 34 cuts the coil 7 on the load-bearing roller.

[0051] The carrier 35 is provided with a flattening mechanism, the tensioning device 32 is used to increase the tensioning force of the material strip released by the unwinding device 31, the flattening mechanism 351 has a first flat plate 353 for moving relative to the carrier 35, and a second screw module 352 for driving the first flat plate 353 to approach or move away from the carrier 35, the first flat plate 353 is used to flatten the strip sheet 8 carried by the carrier 35, and the second cutter 37 is used to cut the strip sheet 8 processed by the flattening mechanism 351. The second driving member 36 includes a second motor 361 and a cam connecting rod mechanism 362 connected to the second motor 361, the output end of the cam connecting rod mechanism 362 is provided with a movable knife seat, and the second cutter 37 is arranged on the movable knife seat, and the movable knife seat is slidably arranged on the frame of the strip slicing machine 3. The second motor 361 drives the movable knife seat to move up and down through the cam connecting rod mechanism 362 to link the second cutter 37 to cut the strip sheet 8 on the carrier 35.

[0052] These sheets will then enter the CNC milling machine 1 to process the blind groove 61, and then the laser processing equipment 2 will complete the precision cutting of the blind groove 61. The striping slicer 3 is seamlessly connected with the CNC milling machine 1 and the laser processing equipment 2 through an assembly line, forming a continuous automated processing process from the coil 7 to the final shielding cover 6. In this process, each device is coordinated by the control system to ensure the accuracy and efficiency of each process and reduce manual intervention.

[0053] The striping and slicing machine 3 can cut the coil 7 into strips and sheets of suitable sizes, greatly reducing material waste and improving material utilization, which is particularly suitable for cost control during mass production. The tensioning device 32 ensures the flatness of the coil 7 during the cutting process, avoids problems such as material displacement or wrinkles, improves the accuracy and consistency of cutting, and thus ensures the processing quality of subsequent CNC milling and laser cutting. The automatic connection between the striping and slicing machine 3 and the CNC milling machine 1 and the laser processing equipment 2 constitutes a complete production chain, greatly shortening the production cycle, and through the unified scheduling of the control system, it realizes efficient production of the entire process and reduces manpower and time costs.

[0054] Specifically, the CNC laser production system for NdFeB shielding covers in the present invention has been improved with respect to the material combination of the workpiece 9 to be processed. The workpiece 9 to be processed can be made of one or more material combinations of iron, nickel, plastic, and low-carbon steel, and can even be made of superconducting materials. The use of sheets made of iron, nickel, plastic, low-carbon steel or superconducting materials allows the production system to adapt to more diversified application scenarios. For example, the combination of low-carbon steel and iron can provide better mechanical strength and magnetic shielding effects, nickel materials have excellent corrosion resistance, and plastics have light weight and good formability. The application of superconducting materials can provide extremely low resistance and efficient electromagnetic shielding capabilities, which are suitable for the shielding needs of high-precision electronic equipment.

[0055] By using new materials such as superconducting materials, the NdFeB shield can effectively shield electromagnetic interference in a wider frequency range. Compared with traditional metal materials, superconducting materials can achieve better shielding effects at low temperatures, which is particularly suitable for high-end technology fields such as superconductor transmission systems and precision instruments. In addition, by selecting a combination of materials, the best balance between weight and cost can be found according to actual needs. Plastic materials reduce the overall weight of the shield 6, which is suitable for weight-sensitive scenarios, while metal materials or superconducting materials ensure shielding performance.

[0056] Specifically, the CNC laser production system for NdFeB shielding cover has a newly added grinding device 4, which is used to finely process the surface of the processed shielding cover 6. First, the coil 7 is cut into strip sheets 8 by the slitting slicer 3, and then the blind groove 61 is processed and precisely formed by laser cutting by the CNC milling machine 1. After the forming is completed, the shielding cover 6 will be transported to the grinding device 4 for surface treatment. The grinding device 4 is composed of a base 41, a vibration motor 42 and a storage bin 43. The vibration motor 42 drives the storage bin 43 to vibrate, so that the abrasive in the storage bin 43 produces a uniform grinding effect on the outer surface of the shielding cover 6 and the inner groove surface of the blind groove 61, thereby removing burrs, protrusions and other defects generated during the processing, and improving the surface finish of the shielding cover 6. After the grinding is completed, the first discharge piece 431 transports the shielding cover 6 from the storage bin 43 to the next process or the finished product output area.

[0057] The application of the grinding device 4 can effectively remove the tiny defects of the shielding cover 6 during the milling and laser cutting process, making the surface of the shielding cover 6 smoother and brighter, and improving the overall quality of the product, especially in the case of high-precision assembly, where surface finish is crucial. Whether it is traditional materials such as iron, nickel, low-carbon steel, or new superconducting materials, the grinding device 4 can flexibly adapt to the surface treatment requirements of different materials by adjusting the type of abrasive and the vibration frequency, ensuring that the shielding cover 6 of different materials can achieve the expected surface quality.

[0058] In another embodiment, an automatic abrasive grading and replacement system and an intelligent detection system are introduced into the grinding device 4. The automatic abrasive grading and replacement system can ensure that abrasives of different particle sizes are used at different stages, improving the surface finish while avoiding abrasive waste. The intelligent detection system is used to monitor the grinding effect of the shielding cover 6 in real time, such as finish and roughness, and automatically adjust the grinding parameters (such as vibration frequency, abrasive particle size, etc.) to achieve accurate adaptive grinding and further improve the processing accuracy; considering the production and processing costs, this embodiment does not adopt this solution.

[0059] Specifically, the CNC laser production system also includes an electroplating device 5, which includes an electroplating tank 51 for containing electrolyte and shielding cover 6, a cathode clamp 52, an anode clamp 53, an electrolyte circulation unit 55, a stirring mechanism and a power module 54; the cathode clamp 52 is used to fix the shielding cover 6 in the electroplating tank 51, and the anode clamp 53 is used to set the external anode material in the electroplating tank 51, and the positive and negative terminals of the power module 54 are respectively connected to the cathode clamp 52 and the anode clamp 53 via wires.

[0060] In actual use, the electrolyte is injected into the electroplating tank 51. The polished shielding cover 6 is fixed in the electroplating tank 51 by the cathode fixture 52 as the plated object (cathode). The metal to be plated (such as nickel, chromium, etc.) is fixed in the electroplating tank 51 by the anode fixture 53 as the anode material. The power module 54 connects the cathode fixture 52 (shielding cover 6) and the anode fixture 53 (metal material) through a wire. Turn on the power supply, form a circuit in the electrolyte, and the anode metal ions dissolve into the electrolyte. Under the action of the electric field, the metal ions move toward the cathode (shielding cover 6) and are reduced and deposited on its surface to form a uniform metal coating. The electrolyte circulation unit 55 continues to work to maintain the uniformity and activity of the electrolyte. The stirring mechanism operates to ensure the uniform distribution of ion concentration in the electrolyte and improve the electroplating effect. After the electroplating is completed, turn off the power supply and remove the shielding cover 6. The shielding cover 6 after electroplating is cleaned, dried, and other subsequent treatments are performed.

[0061] The electroplating process can form a uniform metal coating (such as a nickel layer) on the surface of the NdFeB shield, significantly improving the electromagnetic shielding effectiveness of the shield 6. This coating can effectively block external electromagnetic interference and protect internal sensitive components. The electroplating layer (such as a nickel layer or a chromium layer) can effectively protect the NdFeB material from corrosion caused by environmental factors and extend the service life of the shield 6, especially when used in a humid or corrosive environment.

[0062] A CNC laser production process for a NdFeB shielding cover comprises the following steps:

[0063] S1. Pretreatment: Provide a workpiece 9 made of a magnetic conductive material, and perform preliminary shaping on the workpiece 9; use a magnetic conductive material (such as silicon steel sheet or iron-nickel alloy) as the raw material. Perform preliminary shaping on the material by stamping, shearing and other methods to make it roughly conform to the shape of the final product. This step may also include surface treatment such as cleaning and deburring to prepare for subsequent processing.

[0064] S2, CNC milling: The pre-treated sheet is fixed on the first workbench 11 of the CNC milling machine 1. According to the design requirements, a CNC machining program is written to define the position, depth, shape and other parameters of the milling slot. The control unit 10 controls the movement of the milling cutter 13 according to the program to accurately mill the slot on the sheet for accommodating the NdFeB magnet. This step may require multiple feeds and multiple tool combinations to achieve the ideal slot shape and surface finish.

[0065] S3, laser cutting: The milled sheet is transferred to the workbench of the laser processing equipment 2. The cutting contour and the corresponding cutting code are generated according to the product design drawing using CAD / CAM software. The laser processing equipment 2 controls the laser beam according to the cutting code to accurately cut out the shape of the shielding cover 6. Laser cutting can achieve complex contour shapes with smooth cuts, reducing the need for subsequent processing.

[0066] S4, post-processing: Surface treatment is performed on the cut shielding cover 6, such as deburring, polishing, cleaning, etc. Use precision measuring equipment (such as a three-coordinate measuring machine) to detect the outer dimensions of the shielding cover 6 to ensure that it meets the design requirements. Additional processes such as rust prevention treatment and coating may also be included to improve product performance and durability.

[0067] Specifically, the thickness of the workpiece 9 obtained in step 1 is 0.5-5 mm. The use of a magnetic conductive material with a thickness of 0.5-5 mm can ensure that the NdFeB shielding cover has an appropriate shielding effect while ensuring stability during the processing. Through the combination of CNC milling and laser cutting, the product accuracy can reach the micron level, which is suitable for the production of shielding covers 6 with complex designs. Compared with traditional mechanical processing, laser cutting technology not only reduces the need for secondary processing, but also significantly improves production speed.

[0068] Specifically, the CNC slot milling of step S2 includes the following steps:

[0069] (a) A special positioning fixture 14 is installed on the first workbench 11 of the CNC milling machine 1. The design of the fixture needs to take into account the size and shape of the workpiece 9 to be processed. The workpiece 9 to be processed with a thickness of 0.5-5 mm is firmly fixed on the positioning fixture 14 by mechanical clamping; the positioning fixture 14 may include an adjustable edge positioning block and a clamping device to ensure that the sheet does not move during the processing.

[0070] (b) Input the material properties and dimension data of the workpiece 9 to be processed and the design parameters of the required blind groove 61 through the human-machine interface of the control unit 10. Based on the input data, the CNC system automatically calculates and generates the optimal milling path, feed rate, spindle speed and other processing parameters. The operator can fine-tune the automatically generated parameters based on experience to adapt to specific processing requirements.

[0071] (c) Equipped with a high-pressure coolant pump and precise temperature control device to ensure that the coolant can be sprayed in a pressurized manner to form a fine cooling mist. Multiple nozzles with adjustable angles are installed around the workbench to ensure that the coolant evenly covers the entire processing area. A temperature sensor is set to monitor the surface temperature of the sheet in real time, and the coolant spray volume and pressure are automatically adjusted through a closed-loop control system.

[0072] (d) Using the control unit 10 of the CNC milling machine 1 to control the milling cutter 13 to perform milling processing on the workpiece 9 to be processed on the first workbench 11 according to the processing parameters in step (b) to form a blind groove 61 on the workpiece 9 to be processed. The control unit 10 accurately controls the three-dimensional movement of the milling cutter 13, including the position and feed speed of the X, Y, and Z axes, according to the set processing parameters. Milling is performed layer by layer in a multiple-feed manner, and the feed depth of each feed is automatically adjusted according to the material properties and process requirements. During the milling process, the cooling system continues to work to keep the surface temperature of the sheet constant and reduce thermal deformation.

[0073] Specifically, the CNC slot milling step (d) further includes the following steps:

[0074] (1) The control unit 10 of the CNC milling machine 1 controls the milling cutter 13 to perform reciprocating rough machining on the workpiece 9 according to the set machining parameters of the milling path, feed rate, and rotation speed; the control unit 10 controls the milling cutter 13 to perform reciprocating rough machining along the set path, which can quickly remove a large amount of material to improve the efficiency of material removal while maintaining the surface quality of the sheet.

[0075] (2) The control unit 10 of the CNC milling machine 1 controls the milling cutter 13 to perform circular cutting on the workpiece 9 after rough machining according to the machining parameters to form the prototype of the blind groove 61; after the rough machining is completed, the control unit 10 starts the circular cutting program, and the milling cutter 13 cuts along a preset rectangular, circular or elliptical path to gradually form the prototype of the blind groove 61. The purpose of the circular cutting is to improve the accuracy of the blind groove 61 and provide a good foundation for subsequent fine machining.

[0076] (3) After the circular cutting, the control unit 10 performs radius compensation cutting according to the processing parameters, that is, the milling cutter 13 performs fine trimming along the periphery of the blind groove 61 to ensure that the size of the blind groove 61 meets the design requirements. The radius compensation automatically adjusts the moving trajectory of the milling cutter 13 so that the size of the processed slot accurately matches the shape of the NdFeB magnet to ensure the fit.

[0077] After processing is completed, the blind groove 61 is sized and inspected using online measuring equipment (such as a laser rangefinder or a three-dimensional coordinate measuring machine) to ensure that the processing accuracy meets the requirements. If there is a deviation, the CNC system can automatically adjust the parameters and perform fine-tuning processing. The rough processing of reciprocating tool movement quickly removes materials, greatly shortens the processing time, and improves production efficiency. The combination of annular cutting and radius compensation cutting ensures the geometric accuracy and surface quality of the blind groove 61 and reduces subsequent finishing work.

[0078] Radius compensation cutting automatically adjusts the trajectory of the milling cutter 13 to make the final size of the blind slot 61 completely consistent with the design, ensuring that the NdFeB magnet fits tightly with the blind slot 61. Compared with traditional manual processing or simple single milling, this process has higher consistency and accuracy, which can reduce product scrapping caused by processing errors.

[0079] Specifically, the surface treatment in step S4 includes the following steps:

[0080] Grinding: Put the shielding cover 6 that has passed the previous processing (such as CNC milling) into a special grinder for surface treatment. The grinder can be a vibration grinder, a polisher or a drum grinder, and select suitable abrasives and polishing media according to the shape and size of the shielding cover 6. During the grinding process, mechanical friction is used to remove the rough layer and tiny burrs on the surface of the shielding cover 6, so that the surface is smooth and the surface finish is improved, laying the foundation for the subsequent electroplating process. The abrasive can be materials such as aluminum oxide and silicon carbide to ensure efficient removal and fine polishing. Control the grinding time and abrasive selection to ensure that the material of the shielding cover 6 is not damaged and the required smooth surface is obtained.

[0081] Electroplating: After the grinding treatment, the surface of the shielding cover 6 has a good roughness, and then it is placed in the electroplating tank 51 for surface coating treatment. The electroplating process includes cleaning, degreasing, pickling and electroplating. During electroplating, according to the use requirements of the NdFeB shielding cover, a suitable coating material is selected. Common coatings include single or composite materials such as zinc, nickel, copper, aluminum, and ceramics. Each coating has its own specific anti-corrosion, conductive or wear-resistant properties. The electrolyte and current control system in the electroplating equipment controls the coating thickness through precise current density to ensure the uniformity of the coating and avoid local over-plating or under-plating.

[0082] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A NdFeB shielding cover CNC laser production system, characterized by: The invention comprises a numerically controlled milling machine (1) and a laser processing device (2) used in conjunction with the numerically controlled milling machine (1), wherein the numerically controlled milling machine (1) comprises a first worktable (11) for carrying a workpiece (9) to be processed, a milling cutter (13) movably arranged above the first worktable (11), a driving device (12) for driving the milling cutter (13) to mill grooves on the workpiece (9) to be processed, and a control unit (10) connected to the driving device (12); the control unit (10) is used to control the driving device (12) to drive the milling cutter (13) to mill grooves on the workpiece (9) to be processed on the worktable to form a blind groove (61), wherein the blind groove (61) is used to accommodate a neodymium iron boron magnet. The laser processing equipment (2) comprises a second workbench (21) for carrying a workpiece (9) to be processed after being processed by a numerically controlled milling machine (1), a laser generator (23) arranged above the second workbench (21), and a laser cutting system for controlling the operation of the laser generator (23); the laser cutting system is used to generate a cutting path for the laser generator (23) according to the shape and size of the blind groove (61) and the required shielding cover (6), and to control the laser generator (23) to generate a laser beam to cut and fuse the workpiece (9) to be processed along the edge of the blind groove (61) according to the cutting path, so as to form a shielding cover (6) having the blind groove (61).

2. The CNC laser production system for NdFeB shielding cover according to claim 1 is characterized in that: The NdFeB shielding cover CNC laser production system also includes a striping and slicing machine (3), which includes an unwinding device (31), a tensioning device (32), a first cutter (34) movably arranged relative to the tensioning device (32), and a first driving member (33) connected to the first cutter (34); the unwinding device (31) is used to unwind the external coil (7) to the tensioning device (32) for flattening and tensioning, and the first driving member (33) is used to drive the first cutter (34) to cut the coil (7) flattened and tensioned by the flattening device into strip-shaped sheets (8); The strip-cutting machine (3) further comprises a support platform (35) arranged at the end of the tensioning device (32), a second cutter (37) movably arranged relative to the support platform (35), and a second driving member (36) connected to the second cutter (37); the cutting direction of the first cutter (34) and the cutting direction of the second cutter (37) are arranged to intersect each other, the support platform (35) is used to guide the strip-shaped sheet material (8) to the first cutter (34), and the second driving member (36) is used to drive the second cutter (37) to cut the strip-shaped sheet material (8) carried by the support platform (35) into the block-shaped workpiece (9) to be processed.

3. The CNC laser production system for NdFeB shielding cover according to claim 2 is characterized in that: The support platform (35) is provided with a flattening mechanism (351), the tensioning device (32) is used to increase the tensioning force of the material strip released by the unwinding device (31), the flattening mechanism (351) has a first flat plate (353) for moving relative to the support platform (35), and a second screw module (352) for driving the first flat plate (353) to approach or move away from the support platform (35), the first flat plate (353) is used to flatten the strip sheet (8) carried by the support platform (35), the second cutter (37) is used to cut the strip sheet (8) processed by the flattening mechanism (351), and the workpiece (9) to be processed is made of one or more combinations of iron, nickel, and cobalt or is made of superconducting material.

4. The CNC laser production system for NdFeB shielding cover according to claim 1, characterized in that: The CNC laser production system also includes a grinding device (4), which includes a base (41), a vibration motor (42) arranged on the base (41), and a storage bin (43) arranged on the vibration motor (42); an abrasive for grinding the surface of the shielding cover (6) is arranged in the storage bin (43), and the vibration motor (42) is used to drive the storage bin (43) to vibrate so that the abrasive grinds the outer surface of the shielding cover (6) and the inner groove surface of the blind groove (61) in the storage bin (43).

5. The CNC laser production system for NdFeB shielding cover according to claim 1, characterized in that: The CNC laser production system also includes an electroplating device (5), which includes an electroplating tank (51) for accommodating an electrolyte and a shielding cover (6), a cathode fixture (52), an anode fixture (53) and a power module (54); the cathode fixture (52) is used to fix the shielding cover (6) in the electroplating tank (51), the anode fixture (53) is used to set an external anode material in the electroplating tank (51), and the positive and negative terminals of the power module (54) are respectively connected to the cathode fixture (52) and the anode fixture (53) via wires.

6. A CNC laser production process for NdFeB shielding cover, characterized in that: The following steps are involved: S1, pretreatment: providing a workpiece (9) to be processed made of a magnetic conductive material, and performing preliminary shaping treatment on the workpiece (9); S2, CNC milling: placing the workpiece (9) to be processed obtained in step S1 on the first workbench (11) of the CNC milling machine (1), using the processing system of the CNC milling machine (1) to compile a processing program according to the shape and size of the workpiece (9) to be processed and the required blind groove (61), and the control unit (10) of the CNC milling machine (1) controls the preset milling cutter (13) on the CNC milling machine (1) to perform milling processing on the workpiece (9) to be processed on the first workbench (11) according to the processing program, so that a blind groove (61) is formed on the workpiece (9), and the blind groove (61) is used to accommodate an external neodymium iron boron magnet; S3, laser cutting: the workpiece (9) to be processed with the blind groove (61) is transferred to the second workbench (21) of the laser processing equipment (2), and the laser cutting system in the laser processing equipment (2) draws the processing outline of the required shielding cover (6) according to the shape and size of the workpiece (9) to be processed and the blind groove (61) and generates a cutting code; the laser cutting system controls the laser generator (23) of the laser processing equipment (2) to generate a laser beam according to the cutting code to perform laser cutting on the workpiece (9) to be processed on the second workbench (21) to obtain the shielding cover (6) with the blind groove (61); S4, post-processing: post-processing the shielding cover (6) obtained in step S3, wherein the post-processing includes surface treatment, electroplating treatment and external dimension detection of the shielding cover (6). The shielding cover (6) after post-processing enters the next process.

7. The CNC laser production process for NdFeB shielding cover according to claim 6 is characterized in that: The thickness of the workpiece (9) to be processed obtained in step 1 is 0.5-5 mm.

8. The CNC laser production process for NdFeB shielding cover according to claim 6 is characterized in that: The CNC slot milling comprises the following steps: (a) installing a positioning fixture (14) on a first workbench (11) of a numerically controlled milling machine (1) according to the size of the workpiece (9) to be processed, and using the positioning fixture (14) to stably position the workpiece (9) to be processed on the workbench of the numerically controlled milling machine (1); (b) setting the processing parameters of the milling path, feed rate and rotation speed of the milling cutter (13) according to the outer dimensions of the workpiece (9) to be processed and the required blind groove (61) through the control unit (10) of the numerically controlled milling machine (1); (c) during the process of milling the blind groove (61), the workpiece (9) on the workbench is kept at a preset low temperature by using a coolant, and the coolant is sprayed onto the surface of the workpiece (9) by means of a booster pump to form a protective mist to reduce the thermal impact of the milling cutter (13) during cutting; (d) using a control unit (10) of a numerically controlled milling machine (1) to control a milling cutter (13) to perform a milling process on a workpiece (9) to be processed on a first workbench (11) according to the processing parameters in step (b) so as to form a blind groove (61) on the workpiece (9).

9. The CNC laser production process for NdFeB shielding cover according to claim 8, characterized in that: The CNC slot milling step (d) further comprises the following steps: (1) using a control unit (10) of a numerically controlled milling machine (1) to control a milling cutter (13) to perform reciprocating rough machining on a workpiece (9) according to set machining parameters of a milling path, a feed rate, and a rotation speed; (2) using a control unit (10) of a numerically controlled milling machine (1) to control a milling cutter (13) according to the processing parameters to perform annular cutting on the workpiece (9) to be processed after rough processing, thereby forming a prototype of a blind groove (61); (3) Using a control unit (10) of a numerically controlled milling machine (1) to control a milling cutter (13) to perform radius compensation cutting on the blind groove (61) formed after the annular cutting according to the processing parameters, and finally forming a blind groove (61) for accommodating an external NdFeB magnet.

10. The CNC laser production process for NdFeB shielding cover according to claim 6, characterized in that: The surface treatment in step S4 comprises the following steps: Polishing: placing the shielding cover (6) obtained in step S3 into a polishing machine for polishing the outer surface and polishing the inner groove surface of the blind groove (61); Electroplating: The shielding cover (6) after surface grinding is placed in an electroplating device for surface coating treatment, wherein the coating includes one or more of zinc, nickel, copper, aluminum, and ceramic.

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