Neodymium iron boron shield CNC laser production system and production process

Abstract

The application relates to the technical field of magnet shielding, in particular to a neodymium iron boron shield CNC laser production system and a production process. The system comprises a numerical control milling machine and a laser processing device 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 for driving the milling cutter to mill a groove on a workpiece to be processed and a control unit connected with the driving device; a blind groove formed by the milling cutter is used for containing a neodymium iron boron magnet. The laser processing device comprises a second workbench, 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 for generating a cutting path of the laser generator according to the shape and position of the blind groove, and controlling the laser generator to produce a laser beam to circularly cut and melt a sheet along the edge of the blind groove, so as to form a shield with the blind groove.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of magnet shield manufacturing, and particularly discloses a neodymium iron boron shield CNC laser production system and production process. BACKGROUND

[0002] High magnetic energy products made of neodymium iron boron magnets are widely used in the fields of motors, sensors, earphones and the like. However, with the application of high-performance neodymium iron boron magnets, it is found that there is a serious electromagnetic interference problem, and therefore effective shielding thereof becomes particularly important. The traditional shielding method usually uses metal materials such as copper and aluminum to make a shield through stamping, injection molding and other processing technologies. However, the production process is complex, the cost is high, and the processing precision is low. SUMMARY

[0003] In order to overcome the shortcomings and deficiencies existing in the prior art, the purpose of the present application is to provide a neodymium iron boron shield CNC laser production system and production process, so as to solve the technical problems of complex shielding process, high cost and low processing precision in the prior art.

[0004] To achieve the above-mentioned purpose, the neodymium iron boron shield CNC laser production system of the present application comprises a numerical control milling machine and a laser processing equipment used in cooperation with the numerical control milling machine. The numerical control 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 a groove on the workpiece to be processed, and a control unit connected with the driving device. The control unit is used to control the driving device to drive the milling cutter to mill a blind groove on the workpiece on the workbench to form a blind groove, and the blind groove is used to accommodate the neodymium iron boron magnet from outside.

[0005] The laser processing equipment comprises a second workbench for carrying the workpiece processed by the numerical control milling machine, a laser generator arranged above the second workbench, and a laser cutting system for controlling the laser generator to cut the workpiece on the second workbench. The laser cutting system is used to design and generate a cutting path of 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 around the edge of the blind groove to form a shielding cover with a blind groove.

[0006] Further, the neodymium iron boron shield CNC laser production system further comprises a slitting and slicing machine, which comprises a unwinding device, a tensioning device, a first cutting knife movably arranged relative to the tensioning device, and a first driving member connected with the first cutting knife. The unwinding device is used to unwind the coil material from outside to the tensioning device for flattening and tensioning, and the first driving member is used to drive the first cutting knife to cut the coil material flattened and tensioned by the flattening device into a strip-shaped sheet material.

[0007] The slitting and slicing machine further comprises a bearing table arranged at the end of the tensioning device, a second cutter movably arranged relative to the bearing table, and a second driving member connected with the second cutter; the cutting direction of the first cutter and the cutting direction of the second cutter are arranged to intersect each other, the bearing table is used to deliver the strip-shaped sheet material to the first cutter, and the second driving member is used to drive the second cutter to cut the strip-shaped sheet material delivered by the bearing table to form the workpiece to be processed.

[0008] Further, the bearing table is provided with a flattening mechanism, 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 movement relative to the bearing table and a second screw module for driving the first flat plate member to move close to or away from the bearing table, the first flat plate member is used to flatten the material strip carried by the bearing table, and the second cutter is used to cut the strip-shaped sheet material processed by the flattening mechanism.

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

[0010] Further, the CNC laser production system further comprises a polishing device, the polishing device comprising a base, a vibration motor arranged on the base, and a containing bin arranged on the vibration motor; the containing bin is provided with abrasive for polishing the surface of the shielding cover, and the vibration motor is used to drive the containing bin to vibrate so that the abrasive polishes the outer surface of the shielding cover and the inner surface of the blind groove in the containing bin. The containing bin is further provided with a first discharging member, which is used to deliver the shielding cover polished in the containing bin to the next process.

[0011] Further, the CNC laser production system further comprises an electroplating device, the electroplating device comprising an electroplating tank for containing electrolyte and shielding cover, a cathode clamp, an anode clamp, and a power supply module; the cathode clamp is used to fix the shielding cover in the electroplating tank, the anode clamp is used to arrange external anode material in the electroplating tank, and the positive and negative terminals of the power supply module are respectively connected with the cathode clamp and the anode clamp via wires.

[0012] A neodymium iron boron shielding cover CNC laser production process, comprising the following steps:

[0013] S1, pretreatment: providing a workpiece to be processed made of magnetic conductive material, and performing preliminary shaping treatment on the workpiece to be processed;

[0014] S2, CNC milling: arranging the workpiece to be processed prepared in step S1 on a first worktable of a numerical control milling machine, using a machining system of the numerical control milling machine to compile a machining program according to the shape and size of the workpiece to be processed and the required blind groove, and using a control unit of the numerical control milling machine to control a milling cutter preset on the numerical control milling machine to perform milling groove processing on the workpiece to be processed on the first worktable according to the machining program, so that a blind groove is formed on the workpiece to be processed, and the blind groove is used to contain a neodymium iron boron magnet.

[0015] S3, laser cutting: moving the workpiece with the blind slot to the second workbench of the laser processing equipment, drawing the processing contour of the required shield according to the shape and size of the workpiece and the blind slot by the laser cutting system in the laser processing equipment and generating the cutting code; using the laser cutting system to control the laser generator of the laser processing equipment to generate a laser beam according to the cutting code to perform laser cutting on the workpiece on the second workbench to obtain a shield with a blind slot;

[0016] S4, post-processing: post-processing the shield obtained in step S3, the post-processing including surface treatment and contour size detection of the shield, and the post-processed shield entering the next process.

[0017] Further, the thickness of the workpiece obtained in step 1 is 0.5-5mm.

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

[0019] (a) installing a positioning clamp on the first workbench of the numerical control milling machine according to the size of the workpiece, and using the positioning clamp to stably position the workpiece on the workbench of the numerical control milling machine;

[0020] (b) setting the milling path, feed rate and rotation speed of the milling cutter by the control unit of the numerical control milling machine according to the shape and size of the required blind slot;

[0021] (c) using cooling liquid to make the workpiece on the workbench at a preset low temperature during the milling of the blind slot, and the cooling liquid is sprayed to the surface of the workpiece by the way of pressurization of the booster pump to form a protective gas mist to reduce the heat effect during the cutting of the milling cutter;

[0022] (d) using the control unit of the numerical control milling machine to control the milling cutter to mill the blind slot on the workpiece on the first workbench according to the processing parameters in step (b) to form the blind slot on the workpiece.

[0023] Further, step (d) in the CNC milling slot further includes the following steps:

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

[0025] (2) using the control unit of the numerical control milling machine to control the milling cutter to perform circular cutting on the rough machined workpiece according to the processing parameters to form a blind slot sketch;

[0026] (3) using the control unit of the numerical control milling machine to control the milling cutter to perform radius compensation cutting on the blind groove formed after annular cutting according to the machining parameters, and finally form the blind groove for accommodating the neodymium iron boron.

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

[0028] (1) polishing: placing the shielding cover prepared in step S3 into a polisher to polish the outer surface and polish the inner groove surface of the blind groove;

[0029] (2) electroplating: placing the shielding cover after surface polishing into an electroplating device for surface plating treatment, and the plating layer includes one or more of zinc, nickel, copper, aluminum, and ceramic.

[0030] Further, the laser cutting system in step S3 is connected with a host computer, the host computer controls the laser generator to perform laser cutting on the workpiece after step S2 through the laser cutting system, and one side of the laser generator is provided with a scanning device connected with the laser cutting system;

[0031] The scanning device is used to write the profile size of the workpiece and the blind groove in step S2 into the host computer through the laser cutting system to generate a master graph, the host computer draws a machining profile based on the master graph to generate a cutting preview graph, and the laser cutting system generates a cutting code according to the cutting preview graph and controls the laser generator to cut the workpiece through the cutting code to prepare the shielding cover.

[0032] The neodymium iron boron shielding cover CNC laser production system combines numerical control milling machine with laser processing equipment to realize accurate manufacturing of the neodymium iron boron shielding cover. First, the system uses the CNC milling machine to mill the workpiece to form a blind groove for accommodating the neodymium iron boron magnet. Then, the laser processing equipment cuts the sheet along the edge of the blind groove according to the preset cutting path, and finally obtains a shielding cover with predetermined shape and size. Finally, the prepared shielding cover is polished and electroplated. The whole production process is realized by the control unit and the laser cutting system, and the programming and control system work together, and 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 the high performance requirement, and is especially suitable for neodymium iron boron magnet assembly in harsh working environment. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the numerical control milling machine of the present application;

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

[0035] Figure 3 For Figure 2 Enlarged structural schematic view of part A;

[0036] Figure 4 Whole structure schematic view of the slitting and slicing machine of the present application;

[0037] Figure 5 Local structure schematic view of the slitting and slicing machine of the present application;

[0038] Figure 6 Production flow chart of the Nd-Fe-B shield cover CNC production process of the present application;

[0039] Figure 7 Structure schematic view of the polishing device of the present application;

[0040] Figure 8 Structure schematic view of the electroplating tank of the present application;

[0041] Figure 9 Structure schematic view of the workpiece after being processed by the numerical control milling machine of the present application;

[0042] Figure 10 Finished product schematic view of the Nd-Fe-B shield cover of the present application.

[0043] The reference signs include:

[0044] 1, numerical control milling machine; 2, laser processing equipment; 3, slitting and slicing machine; 4, polishing device; 5, electroplating device; 6, shield cover; 61, blind groove; 7, coiled material; 8, strip-shaped sheet material; 9, workpiece; 10, control unit; 11, first workbench; 12, driving device; 121, first screw rod module; 122, sliding table; 13, milling cutter; 14, positioning clamp; 21, second workbench; 22, laser cutting system; 23, laser generator; 24, cooling liquid storage tank; 25, cooling spray pipe; 31, unwinding device; 32, tensioning device; 33, first driving member; 34, first cutter; 35, bearing table; 36, second driving member; 361, second motor; 362, cam connecting rod mechanism; 37, second cutter; 41, base; 42, vibration motor; 43, containing bin; 431, first discharging member; 51, electroplating tank; 52, cathode clamp; 53, anode clamp; 54, power module; 55, electrolyte circulating unit. DETAILED DESCRIPTION

[0045] In order to facilitate the understanding of those skilled in the art, the present application will be further described below in conjunction with the embodiments and the drawings, and the content mentioned in the embodiments is not a limitation of the present application.

[0046] Please refer to Figures 1 to 10As shown, the neodymium iron boron shield CNC laser production system of the present application realizes the production of neodymium iron boron shield through the combined operation of the numerical control milling machine 1 and the laser processing equipment 2. First, the first workbench 11 of the numerical control milling machine 1 carries the workpiece 9 to be processed, and the control unit 10 controls the milling cutter 13 to mill along the surface of the sheet according to the preset program to form a blind groove 61 with accurate dimensions for accommodating the neodymium iron boron magnet. During the milling process, the driving device 12 is composed of two groups of first screw rod modules 121 arranged in cross and a sliding table 122, the milling cutter 13 is arranged on the sliding table 122, and the two first screw rod modules 121 drive the milling cutter 13 on the sliding table 122 to feed along the X and Z axes respectively, the driving device 12 provides accurate feed and speed to ensure processing accuracy, and at the same time protects the processing surface by spraying cooling liquid to reduce thermal influence. After the milling groove 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 through the laser cutting system, and the laser generator 23 performs ring cutting along the edge of the blind groove 61 according to the generated path, finally forming a shield 6 with a blind groove 61.

[0047] The laser processing equipment 2 and the numerical control milling machine 1 work cooperatively through the control unit 10 and the laser cutting system, the CNC milling machine is responsible for accurate mechanical processing, and the laser processing equipment 2 provides high-precision cutting capability, and the two are closely linked. In this embodiment, the laser processing equipment 2 is provided with a matching cooling device, which includes a cooling liquid storage tank 24, a cooling pump (not shown in the figure) and a cooling spray pipe 25. In use, the laser cutting system controls the cooling pump to continuously spray the cooling liquid in the cooling liquid storage tank 24 to the second workbench 21 through the cooling spray pipe 25 to cooperate with the laser generator for cutting operation. In actual use, the system can also add automatic feeding and discharging devices to further improve production efficiency. During production, the laser cutting system can detect the size of the workpiece through the scanning device to ensure accurate matching of laser cutting and milling processing and reduce errors.

[0048] Through the combination of the control unit 10 and the laser cutting device, the system can realize high-precision processing of the shield 6, ensure that the shape and size of the blind groove 61 meet the requirements of the neodymium iron boron magnet, and reduce the size deviation. This scheme realizes the automatic cooperation of the numerical control 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 feeding and discharging device, the production process can be further optimized to ensure that each process is closely linked and the overall processing speed is improved.

[0049] Specifically, the neodymium iron boron shield CNC laser production system further combines a slitting and slicing machine 3 for cutting the coil material 7 into sheets to be processed. First, the unwinding device 31 unwinds the external coil material 7 and flattens and tightens the coil material 7 through the tensioning device 32 (consisting of multiple tensioning rollers arranged at intervals) to ensure that the coil material 7 is flat and does not shift during the cutting process. Then, the first driving member 33 controls the first cutting knife 34 to cut along the length direction of the coil material 7, forming a strip-shaped sheet 8. The strip-shaped sheet 8 is conveyed to the second cutting knife 37 through the carrying table 35, and the second driving member 36 controls the second cutting knife 37 to cut the strip-shaped sheet 8 in a direction intersecting the first cutting knife 34, generating a processed piece 9 meeting the size requirements.

[0050] In this embodiment, the first driving member 33 includes a first motor and a carrying roller shaft connected to the output shaft of the first motor. The first cutting knife 34 is composed of an extrusion roller shaft and multiple blades thereon. Multiple emptying grooves are provided above the carrying roller shaft for accommodating the blades of the first cutting knife 34. The carrying roller shaft and the extrusion roller shaft are connected through gear meshing. The coil material 7 flattened by the tensioning device 32 is clamped by the extrusion roller shaft and the carrying roller shaft. The first motor drives the extrusion roller shaft to rotate through the carrying roller shaft; thereby making the first cutting knife 34 cut the coil material 7 on the carrying roller shaft.

[0051] The carrying table 35 is provided with a flattening mechanism. The tensioning device 32 is used to increase the tension of the material strip released by the unwinding device 31. The flattening mechanism 351 has a first flat piece 353 for movement relative to the carrying table 35, and a second screw module 352 for driving the first flat piece 353 to approach or move away from the carrying table 35. The first flat piece 353 is used to flatten the strip-shaped sheet 8 carried by the carrying table 35. The second cutting knife 37 is used to cut the strip-shaped sheet 8 processed by the flattening mechanism 351. The second driving member 36 includes a second motor 361 and a cam linkage mechanism 362 connected to the second motor 361. The output end of the cam linkage mechanism 362 is provided with a movable knife seat. The second cutting knife 37 is arranged on the movable knife seat. The movable knife seat is slidingly arranged on the rack of the slitting and slicing machine 3. The second motor 361 drives the movable knife seat to move up and down through the cam linkage mechanism 362, and the second cutting knife 37 cuts the strip-shaped sheet 8 on the carrying table 35.

[0052] These sheets will then enter the CNC milling machine 1 for processing of the blind groove 61, and then the laser processing equipment 2 will complete the precise cutting of the blind groove 61. The slitting and slicing machine 3 seamlessly connects with the CNC milling machine 1 and the laser processing equipment 2 in a flow line manner, forming a continuous and automated processing process from the coil material 7 to the final shield 6. In this process, each device is operated cooperatively by the control system to ensure the precision and efficiency of each process and to reduce manual intervention.

[0053] The slitting and slicing machine 3 can cut the roll material 7 into appropriate size strips and sheets, greatly reducing material waste and improving material utilization, especially suitable for cost control in mass production. The tensioning device 32 ensures the flatness of the roll material 7 during cutting, avoiding problems such as material displacement or wrinkling, improving the precision and consistency of cutting, and thus ensuring the processing quality of subsequent CNC milling and laser cutting. The automatic connection of the slitting and slicing machine 3 with the numerical control milling machine 1 and the laser processing equipment 2 forms a complete production chain, greatly shortening the production cycle, and through the unified scheduling of the control system, realizes efficient production of the whole process, reduces labor and time cost.

[0054] Specifically, the neodymium iron boron shield CNC laser production system in the application improves the material combination of the workpiece 9. The workpiece 9 can be made of one or more materials such as iron, nickel, plastic, and low-carbon steel, or even superconducting materials. The use of sheet materials made of iron, nickel, plastic, low-carbon steel, or superconducting materials makes the production system more adaptable to diverse application scenarios. For example, the combination of low-carbon steel and iron can provide better mechanical strength and magnetic shielding effect, nickel material has excellent corrosion resistance, and plastic has good lightweight and good formability. The application of superconducting materials can provide extremely low resistance and high electromagnetic shielding capability, suitable for shielding needs of high-precision electronic equipment.

[0055] By using new materials such as superconducting materials, the neodymium iron boron shield can effectively shield electromagnetic interference in a wider frequency range. Compared with traditional metal materials, superconducting materials can achieve better shielding effect at low temperature, especially suitable for high-end technical fields such as superconductor transmission systems and precision instruments. In addition, through the selection of material combination, the best balance between weight and cost can be found according to actual needs. Plastic material reduces the overall weight of the shield 6, suitable for weight-sensitive scenarios, while metal or superconducting materials ensure the shielding performance.

[0056] Specifically, the neodymium iron boron shield CNC laser production system adds a polishing device 4 for fine processing of the surface of the finished shield 6. First, the roll material 7 is cut into strips and sheets 8 by the slitting and slicing machine 3, then the CNC numerical control milling machine 1 is used for blind groove 61 processing and laser cutting precision forming. After forming is completed, the shield 6 will be transported to the polishing device 4 for surface treatment. The polishing device 4 is composed of a base 41, a vibration motor 42 and a containing bin 43. The vibration motor 42 drives the containing bin 43 to vibrate, so that the abrasive in the containing bin 43 produces uniform grinding effect on the outer surface of the shield 6 and the inner groove surface of the blind groove 61, thereby removing burrs, protrusions and other defects generated during processing, and improving the surface finish of the shield 6. After polishing, the first discharge member 431 transports the shield 6 from the containing bin 43 to the next process or finished product output area.

[0057] The application of the polishing device 4 can effectively remove the tiny defects of the shielding cover 6 during the milling and laser cutting processes, making the surface of the shielding cover 6 smoother and more polished, and improving the overall quality of the product. In particular, in the case of high-precision assembly, surface finish is crucial. Whether it is traditional iron, nickel, low-carbon steel, or new superconducting materials, the polishing device 4 can be adjusted to adapt to different material surface treatment requirements by adjusting the type and vibration frequency of the abrasive, ensuring that the shielding cover 6 of different materials can achieve the expected surface quality.

[0058] In another embodiment, an abrasive automatic grading and replacement system and an intelligent detection system are introduced into the polishing device 4. The abrasive automatic grading and replacement system can ensure the use of different particle sizes of abrasive at different stages, improving the surface finish while avoiding waste of abrasive. The intelligent detection system is used to monitor the polishing effect of the shielding cover 6 in real time, such as the smoothness and roughness, and automatically adjust the polishing parameters (such as vibration frequency, abrasive particle size, etc.), to achieve precise adaptive polishing and further improve the machining precision. Considering the production and processing cost, this embodiment does not adopt this scheme.

[0059] Specifically, the CNC laser production system further comprises an electroplating device 5, which comprises an electroplating tank 51 for containing electrolyte and the shielding cover 6, a cathode clamp 52, an anode clamp 53, an electrolyte circulation unit 55, a stirring mechanism, and a power supply 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; the positive and negative terminals of the power supply module 54 are respectively connected to the cathode clamp 52 and the anode clamp 53 through 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 clamp 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 clamp 53 as the anode material. The power supply module 54 is connected to the cathode clamp 52 (shielding cover 6) and the anode clamp 53 (metal material) through wires. Turn on the power supply, form an electric circuit in the electrolyte, and dissolve the anode metal ions into the electrolyte. The metal ions move to the cathode (shielding cover 6) under the action of the electric field and are reduced and deposited on its surface to form a uniform metal coating. The electrolyte circulation unit 55 works continuously to maintain the uniformity and activity of the electrolyte. The stirring mechanism operates to ensure uniform distribution of ion concentration in the electrolyte, improving the electroplating effect. After electroplating is completed, the power supply is turned off, and the shielding cover 6 is taken out. The electroplated shielding cover 6 is subjected to subsequent processing such as cleaning and drying.

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

[0062] A neodymium iron boron shield CNC laser production process, comprising the following steps:

[0063] S1, pretreatment: providing a workpiece 9 made of magnetic conductive material for processing, and performing preliminary shaping treatment on the workpiece 9; using magnetic conductive material (such as silicon steel sheet or iron-nickel alloy) as raw material. The material is preliminarily shaped by punching, shearing and other methods to generally conform to the shape of the final product. This step may also include cleaning, deburring and other surface treatments to prepare for subsequent processing.

[0064] S2, CNC milling: fixing the pretreated sheet on the first workbench 11 of the numerical control milling machine 1. According to the design requirements, write the CNC processing program, define the position, depth, shape and other parameters of the milling groove. The control unit 10 controls the movement of the milling cutter 13 according to the program to accurately mill the groove for accommodating the neodymium iron boron magnet on the sheet. This step may require multiple feeds and multiple tools to achieve the ideal groove shape and surface finish.

[0065] S3, laser cutting: transferring the milled sheet to the workbench of the laser processing equipment 2. Use CAD / CAM software to generate cutting contours and corresponding cutting codes according to product design drawings. The laser processing equipment 2 controls the laser beam according to the cutting code to accurately cut the shape of the shield 6. Laser cutting can achieve complex contour shapes with smooth cuts, reducing the need for subsequent processing.

[0066] S4, post-processing: performing surface treatment on the cut shield 6, such as deburring, polishing, cleaning, etc. Use precision measuring equipment (such as a three-coordinate measuring machine) to detect the size of the shield 6 to ensure that it meets the design requirements. It may also include anti-rust treatment, coating and other additional processes to improve product performance and durability.

[0067] Specifically, the thickness of the workpiece 9 prepared in step 1 is 0.5-5mm. Using magnetic conductive material with a thickness of 0.5-5mm can ensure the stability of the neodymium iron boron shield during processing while maintaining appropriate shielding effectiveness. Through the combination of CNC milling and laser cutting, the product precision can reach the micron level, suitable for the production of complex design shields 6. 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 milling of step S2 comprises the following steps:

[0069] (a) A special positioning fixture 14 is installed on the first worktable 11 of the CNC milling machine 1, which is designed according to the size and shape of the workpiece 9. The workpiece 9 with a thickness of 0.5-5 mm is firmly fixed on the positioning fixture 14 by mechanical clamping; the positioning fixture 14 can include adjustable edge positioning blocks and pressing devices to ensure that the sheet does not move during processing.

[0070] (b) The material properties, size data, and design parameters of the required blind slot 61 of the workpiece 9 are input through the human-machine interface of the control unit 10. According to the input data, the CNC system automatically calculates and generates the optimal milling path, feed rate, and spindle speed, etc. The operator can fine-tune the automatically generated parameters according to experience to adapt to specific processing needs.

[0071] (c) A high-pressure cooling liquid pump and precise temperature control device are provided to ensure that the cooling liquid can be sprayed in a pressurized manner to form a fine cooling mist. Multiple adjustable angle nozzles are installed around the worktable to ensure that the cooling liquid uniformly covers the entire processing area. Temperature sensors are installed to monitor the surface temperature of the sheet in real time, and the cooling liquid spray amount and pressure are automatically adjusted through a closed-loop control system.

[0072] (d) The control unit 10 of the CNC milling machine 1 controls the milling cutter 13 to mill the workpiece 9 on the first worktable 11 according to the processing parameters in step (b) to form a blind slot 61 on the workpiece 9. The control unit 10 accurately controls the three-dimensional motion of the milling cutter 13, including the position of the X, Y, and Z axes and the feed speed, according to the set processing parameters. Multiple feed methods are used for layer-by-layer milling, and the feed depth is automatically adjusted according to material properties and process requirements. During milling, the cooling system continues to work to maintain the surface temperature of the sheet constant and reduce thermal deformation.

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

[0074] (1) The control unit 10 of the CNC milling machine 1 controls the milling cutter 13 to perform reciprocating tool path rough machining on the workpiece 9 according to the set milling path, feed rate, and speed of the processing parameters; the control unit 10 controls the milling cutter 13 to perform reciprocating tool path 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 numerical control milling machine 1 controls the milling cutter 13 to perform circular cutting on the rough-machined workpiece 9 according to the machining parameters, forming a blind groove 61 prototype; after rough machining is completed, the control unit 10 starts the circular cutting program, and the milling cutter 13 performs cutting along the preset rectangular or circular or elliptical path, gradually forming the prototype of the blind groove 61. The purpose of circular cutting is to improve the accuracy of the blind groove 61 and provide a good foundation for subsequent finishing.

[0076] (3) After circular cutting, the control unit 10 performs radius compensation cutting according to the machining 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. Radius compensation adjusts the movement trajectory of the milling cutter 13 automatically, so that the size of the machined groove matches the shape of the neodymium iron boron magnet, ensuring the fit.

[0077] After machining is completed, the size of the blind groove 61 is detected by using an online measuring device (such as a laser range finder or a three-coordinate measuring instrument) to ensure that the machining accuracy meets the requirements. If there is a deviation, the CNC system can automatically adjust the parameters for fine tuning machining. Through reciprocating rough machining, the material is quickly removed, greatly shortening the machining time and improving the production efficiency. The combination of circular cutting and radius compensation cutting ensures the geometric accuracy and surface quality of the blind groove 61, reducing subsequent finishing work.

[0078] Radius compensation cutting automatically adjusts the trajectory of the milling cutter 13, so that the final size of the blind groove 61 completely matches the design, ensuring the close fit of the neodymium iron boron magnet and the blind groove 61. Compared with traditional manual machining or simple single milling, this process has higher consistency and accuracy, which can reduce product scrap caused by machining errors

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

[0080] Polishing: Put the shielding cover 6 machined by the previous process (such as CNC milling) into a special polishing machine for surface treatment. The polishing machine can be a vibration polishing machine, a polishing machine or a drum polishing machine, etc. According to the shape and size of the shielding cover 6, select appropriate abrasive and polishing medium. During polishing, mechanical friction is used to remove the rough layer and small burrs on the surface of the shielding cover 6, so that the surface is smooth and the surface finish is improved, laying a foundation for the subsequent electroplating process. The abrasive can be alumina, silicon carbide and other materials to ensure efficient removal and fine polishing. Control the polishing time and abrasive selection to ensure that the shielding cover 6 is not damaged and the smooth surface required is obtained.

[0081] Electroplating: After the polishing process, the shield 6 has a good roughness on the surface, 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 neodymium iron boron shield, the appropriate coating material is selected, and the common coating materials include zinc, nickel, copper, aluminum, ceramic and other single or composite materials. Each coating has its specific corrosion resistance, electrical conductivity or wear resistance. The electrolyte and current control system in the electroplating equipment control the coating thickness by precise current density, ensure the uniformity of the coating, and avoid local overplating or insufficient plating.

[0082] The above is only the preferred embodiment of the present application, and for those skilled in the art, according to the idea of the present application, the specific implementation and application range can be changed, and the content of the description should not be understood as a limitation of the present application.

Claims

1. A CNC laser production system for NdFeB shields, characterized by: The invention comprises a numerical control milling machine (1) and a laser processing device (2) used in conjunction with the numerical control milling machine (1), wherein the numerical control milling machine (1) comprises a first workbench (11) for carrying a workpiece (9) to be processed, a milling cutter (13) movably arranged above the first workbench (11), a driving device (12) for driving the milling cutter (13) to mill a groove 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 perform a groove milling process on the workpiece (9) to be processed on the workbench to form a blind groove (61); the control unit (10) of the numerical control milling machine (1) controls the milling cutter (13) to perform radius compensation cutting on the blind groove (61) formed after annular cutting according to processing parameters, and 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 according to the cutting path to cut and fuse the workpiece (9) along the edge of the blind groove (61) to form a shielding cover (6) having the blind groove (61); The NdFeB shielding cover CNC laser production system further comprises a slitting and slicing machine (3), the slitting and slicing machine (3) comprising 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 a strip-shaped sheet (8); The slitting and slicing machine (3) further includes a carrier (35) arranged at the end of the tensioning device (32), a second cutter (37) movably arranged relative to the carrier (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 with each other, the carrier (35) is used to guide the strip sheet (8) to the first cutter (34), and the second driving member (36) is used to drive the second cutter (37) to cut the strip sheet (8) carried by the carrier (35) into the block-shaped workpiece (9); The carrier (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 carrier (35), and a second screw module (352) for driving the first flat plate (353) to move closer to or away from the carrier (35), the first flat plate (353) is used to flatten the strip sheet (8) carried by the carrier (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 made of superconducting material; The CNC laser production system further includes a grinding device (4), the grinding device (4) including a base (41), a vibration motor (42) disposed on the base (41), and a storage bin (43) disposed on the vibration motor (42); an abrasive for grinding the surface of the shielding cover (6) is disposed 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); 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 connected to the cathode fixture (52) and the anode fixture (53) via wires, respectively.

2. The production process of a CNC laser production system for a NdFeB shield according to claim 1, 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: the workpiece (9) obtained in step S1 is placed on the first workbench (11) of the CNC milling machine (1), and a machining program is compiled using the machining system of the CNC milling machine (1) according to the shape and size of the workpiece (9) and the required blind groove (61). 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 on the workpiece (9) on the first workbench (11) according to the machining 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) 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.

3. The production process of a CNC laser production system for a NdFeB shield according to claim 2, characterized in that: The thickness of the workpiece (9) to be processed obtained in step 1 is 0.5-5 mm.

4. The production process of a CNC laser production system for a NdFeB shield according to claim 2, characterized in that: The CNC slot milling comprises the following steps: (a) installing a positioning fixture (14) on a first workbench (11) of a CNC 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) on the workbench of the CNC milling machine (1); (b) setting the milling path, feed rate, and rotation speed of the milling cutter (13) according to the dimensions of the workpiece (9) to be machined and the required blind groove (61) through the control unit (10) of the CNC 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 the control unit (10) of the CNC milling machine (1) to control the milling cutter (13) to perform a groove milling process 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).

5. The production process of a CNC laser production system for a NdFeB shield according to claim 4, 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 rotational speed; (2) Using the control unit (10) of the CNC milling machine (1) to control the 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 the blind groove (61).

6. The production process of a CNC laser production system for a NdFeB shield according to claim 2, characterized in that: The surface treatment in step S4 includes the following steps: Polishing: placing the shielding cover (6) obtained in step S3 into a polishing machine to polish the outer surface and 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, wherein the coating includes one or more of zinc, nickel, copper, aluminum, and ceramic.

Images