Device for improving dimensional accuracy of bonded magnet

Abstract

The utility model provides a device for improving the dimensional accuracy of a bonded magnet. Comprising a positioning column and multiple stages of circular knives, the positioning column is a hollow cylinder, steps are arranged on the upper portion and the lower portion of the positioning column, the circular knives with the step-by-step size difference of 0.02-0.05 mm are installed in the middle, and fixing plates are arranged on the upper portion and the lower portion to enhance stability. The cross section of the guide block is a hollow cross-shaped cylinder, and the hollow part of the guide block is a tapered sliding block, so that the magnet can be accurately guided to enter a machining position, vibration and abrasion are reduced, and machining precision and consistency are improved. The diameter of the fixing plate is far larger than that of the positioning column, a wider supporting area is provided, and stress is dispersed. The positioning columns are provided with counter bores and connected with the fixing plate through bolts, mounting and dismounting are convenient, and the overall rigidity is enhanced. The front end of the circular cutter is designed to be a cutting part with the radian of 5 degrees and the thickness smaller than 0.2 mm, cutting force distribution is optimized, and machining errors and cutter abrasion are reduced. A matched pressing rod is arranged, so that automatic extrusion cutting is realized, the production efficiency is improved, and the energy consumption and the cost are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of magnet material processing and manufacturing, especially to a device for improving the size accuracy of bonded magnets. BACKGROUND

[0002] Bonded neodymium iron boron magnets are formed by one-time molding through die pressing, with high size accuracy, but are easily affected by many factors such as environmental temperature, magnetic powder particle size, mixing process parameters, mold size and wear, etc., resulting in a size accuracy of the magnets within ±0.05mm, and even within ±0.02mm for excellent process control, but it is very difficult to ensure a size accuracy within ±0.01mm. Furthermore, bonded magnets are bonded by glue, with high porosity, and are not suitable for machining methods such as external grinding to improve size accuracy. This leads to cracking or hidden cracking of the product during subsequent assembly, especially when used as an insert for injection molding. The slight hidden cracking is easy to miss, and only appears after the machine is running. When used in automotive parts, the reliability cannot be guaranteed.

[0003] The invention patent with the authorized publication number CN117620468A discloses a cutting device for neodymium iron boron magnet processing, which includes a cutting assembly, a cleaning assembly inside the cutting assembly, and a recycling assembly installed on the upper end of the cutting assembly. The cutting assembly includes two upright plates symmetrically arranged on both sides, each of which is fixedly installed with an installation strip on the upper end, and each of the installation strips is fixedly installed with a first sliding rail. Each of the first sliding rails is movably sleeved with a first sliding block, and the first sliding blocks are fixedly connected with a cross beam. The upper surface of the cross beam is fixedly installed with a second sliding rail, and the two ends of the second sliding rail are provided with shaft plates, each of which is fixedly installed on the cross beam. The shaft plates are movably sleeved with a horizontal screw, and the shaft body of the horizontal screw is fixedly connected with a horizontal motor. The device can improve the cleaning effect of metal plates and the recycling convenience of metal plates. The recycling process does not require the worker to contact the metal plates, thereby improving the safety of recycling. However, the structure of the invention is complex, including multiple components such as upright plates, installation strips, sliding rails, sliding blocks, cross beams, horizontal screws, and motors, which may result in high equipment manufacturing costs. Neodymium iron boron magnet materials have high hardness and brittleness, and are prone to breakage or damage during processing, which may affect the processing efficiency. The device mainly targets the cleaning and recycling of metal plates, but may not be flexible enough for the special processing needs of neodymium iron boron magnets, such as high-precision cutting and special-shaped processing. The device mainly achieves cutting through mechanical movement, and the precision may be affected by the wear and assembly errors of mechanical components. For high-precision processing needs, such as a precision requirement of ±0.01mm, the device may not meet the requirements. SUMMARY

[0004] The purpose of the present application is to provide a device that can significantly improve the size accuracy of bonded magnets, to solve the problems of large size error, low processing efficiency and insufficient processing stability in the processing of bonded magnets in the prior art. By designing a device containing a positioning column and a multi-stage circular knife, using the hollow cylindrical structure and step design, the precise installation and positioning of the circular knife are realized, and the processing size accuracy is effectively controlled through step-by-step cutting, meeting the high-precision processing requirements.

[0005] Another purpose of the present application is to further improve the positioning accuracy and stability during processing by setting a guide block between the positioning column and the fixed plate. The hollow cross-shaped structure of the guide block matches the step of the positioning column, which can provide accurate guidance for the bonded magnet, reduce vibration and deviation during processing, and ensure that the magnet always maintains the correct position during processing, thereby improving the size consistency and processing quality.

[0006] In addition, the present application also aims to improve the processing efficiency and service life of the device by optimizing the structural design of the device. For example, the taper slide design of the hollow part of the guide block can reduce the friction between the magnet and the device, and reduce the wear during processing; the large diameter design of the fixed plate enhances the overall stability of the device and reduces vibration; and the counterbore design of the positioning column and the bolt connection method improve the assembly and maintenance efficiency of the device. At the same time, the thin cutting part of the circular knife and the pressure cutting design of the pressure rod further improve the processing precision and efficiency, and reduce the production cost.

[0007] The utility model provides a kind of device for improving the size accuracy of bonded magnet, including positioning column and circular knife, positioning column is hollow cylinder, and is provided with step in upper and lower, and circular knife is provided with in middle, and is provided with fixed plate in upper and lower;

[0008] Circular knife is provided with multiple stages, and the size of each circular knife is different by 0.02-0.05mm, and circular knife is placed in positioning column in turn from big to small.

[0009] Preferably, the positioning column and the fixed plate are provided with a guide block in the middle. It accurately guides the bonded magnet into the processing position, reduces the processing error, and improves the size accuracy and consistency. The guide block also improves the versatility of the device, making it suitable for processing magnets of various specifications, while reducing wear, prolonging service life and reducing maintenance costs. In terms of production efficiency, the guide block can quickly position the magnet, reducing adjustment time, especially in batch production.

[0010] Preferably, the cross-section of the guide block is a hollow cross-shaped cylinder, with the cross-shaped part matching the step of the positioning column. This provides precise guidance and stable support for the bonded magnet, reducing vibration and deviation during processing, thereby significantly improving processing accuracy and dimensional consistency. At the same time, the matching design of the cross shape and the step enhances the overall rigidity of the device, ensuring quick and accurate alignment of the magnet, reducing processing errors caused by positional deviation. In addition, the hollow cross-shaped structure can effectively limit the lateral movement of the magnet, reducing the damage of impact force to the device, prolonging the service life and reducing the maintenance cost.

[0011] Preferably, the hollow part of the guide block is a tapered slide. The tapered slide can provide more accurate guiding function, ensuring that the bonded magnet can be quickly and accurately aligned when entering the processing position, reducing processing errors caused by positional deviation. Secondly, the tapered design can reduce the friction between the slide and the magnet, making the magnet more smooth during guiding, thereby reducing wear and tear and prolonging the service life of the device. In addition, this design can effectively absorb the impact force generated during processing, enhancing the stability and reliability of the device. In practical application, the structure of the tapered slide can adapt to magnets of different sizes and shapes, improving the versatility and flexibility of the device.

[0012] Preferably, the diameter of the fixed plate is much larger than the diameter of the positioning column. This provides a wider support area for the device, significantly enhancing overall stability and reducing vibration and displacement during processing. This structure can effectively disperse stress, avoiding damage to the positioning column caused by stress concentration, prolonging the service life of the device. At the same time, the larger fixed plate can also serve as the installation base for other components, improving the functionality and expandability of the device, and providing a more accurate positioning reference for the positioning column, improving processing accuracy and dimensional consistency.

[0013] Preferably, the positioning column is provided with a counterbore, and the positioning column is connected to the fixed plate by a bolt. The counterbore design allows the bolt head to be completely embedded inside the positioning column, avoiding obstacles caused by protruding parts, providing a smoother surface, and improving the aesthetics and safety of the device. At the same time, the bolt connection method not only facilitates quick installation and disassembly, improving maintenance efficiency, but also enhances the overall rigidity and stability of the device, disperses stress, and prolongs the service life.

[0014] Preferably, each circular knife is provided with a cutting part with an arc of 5° and a front end thickness less than 0.2mm. The 5° arc design can optimize the stress distribution during cutting, making the cutting force more evenly act on the magnet surface, thereby reducing the vibration and impact during cutting, improving the stability and precision of processing. Secondly, the cutting part with a front end thickness less than 0.2mm can realize more delicate processing, reduce the cutting allowance, avoid the size deviation caused by excessive cutting, and ensure the size accuracy and surface quality of the magnet. In addition, this design can also reduce the damage to the magnet during cutting, reduce the processing stress, prolong the service life of the cutter, and improve the processing efficiency and reduce the production cost.

[0015] Preferably, the device is provided with a matching pressure rod, and the product is pressed out for cutting by the pressure rod. The pressure rod can provide stable pressing force for the product, ensuring that the product remains fixed during cutting, avoiding processing errors caused by vibration or displacement, thereby significantly improving the processing precision and size consistency. Secondly, the use of the pressure rod realizes the automatic and continuous processing process, reduces manual intervention, improves production efficiency, and is especially suitable for batch production scenarios. In addition, cutting by pressing out through the pressure rod can better control the cutting depth and force, reduce cutter wear, prolong the service life of the cutter, and reduce energy consumption and cost during processing.

[0016] The beneficial effects of the utility model are: the device adopts multi-stage circular knives, each stage has a size difference of 0.02-0.05mm, and is equipped with a thin cutting part with an arc of 5° and a thickness less than 0.2mm, which can cut precisely step by step, significantly improve the size accuracy and surface quality, and reduce processing errors and cutter wear.

[0017] The device enhances the overall stability by the cooperation of the large-diameter fixed plate, the positioning column step and the guide block, and the hollow cross-shaped guide block with a tapered sliding block, reduces vibration and deviation during processing, ensures that the magnet always maintains an accurate position during processing, and further improves the processing precision and efficiency.

[0018] The device is equipped with a matching pressure rod to realize automatic pressing and cutting, improve production efficiency, and is especially suitable for batch production. At the same time, the positioning column is provided with a counterbore and connected with the fixed plate through bolts, which is convenient for quick disassembly and maintenance, prolongs the service life of the device, and reduces the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a kind of front view cross section schematic diagram of the utility model.

[0020] In the figure: 1, pressure rod, 2, upper fixed plate, 3, upper guide block, 4, first-stage circular knife, 5, second-stage circular knife, 6, third-stage circular knife, 7, positioning column, 8, lower guide block, 9, lower fixed plate. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0022] The positioning column 7 is a hollow cylinder, and is provided with steps up and down and a circular cutter in the middle. The positioning column 7 is provided with the fixed plates 2 and 9 up and down. The circular cutter is provided with multiple levels, and the size of each level of the circular cutter is different by 0.02-0.05 mm. The circular cutters are placed in the positioning column 7 in turn from large to small.

[0023] The circular cutter is provided with multiple levels, and the size of each level is different by only 0.02-0.05 mm, and the circular cutters are placed in the positioning column 7 in turn from large to small. This step-by-step cutting method can gradually reduce the size of the magnet, avoid the size deviation and machining error caused by one-time cutting, and thus significantly improve the size precision and machining quality. The design of the multiple levels of the circular cutter not only improves the size precision, but also enhances the versatility of the device. By replacing the circular cutters of different sizes, the device can adapt to the machining requirements of bonded magnets of various specifications, without frequent adjustment of the equipment, thereby improving the production efficiency and equipment utilization.

[0024] The hollow cylinder structure and the up-and-down step design of the positioning column 7 provide accurate installation positions for the circular cutter, and ensure that the circular cutter always maintains concentricity and stability during the machining process. The setting of the up-and-down fixed plates 2 and 9 further enhances the overall rigidity of the device, reduces vibration during the machining process, and ensures machining precision.

[0025] The step-by-step cutting method reduces the depth of single cutting, reduces tool wear and replacement frequency, and reduces material waste during the machining process, thereby reducing production costs. By accurately controlling the size difference and cutting sequence of each level of the circular cutter, the device can ensure the size precision and surface quality of the bonded magnet, reduce the rate of defective products caused by machining errors, and improve the overall quality of the product.

[0026] The device is designed with multiple levels of circular cutters, each level of the circular cutter is different by only 0.02-0.05 mm, and the circular cutters are placed in the positioning column 7 in turn from large to small, which can realize step-by-step precise cutting, thereby effectively controlling the size precision of the bonded magnet. In addition, the front end of each circular cutter is less than 0.2 mm thick, and has a 5° arc cutting part. This optimized design further improves the fineness of cutting, reduces machining errors, and ensures the consistency and accuracy of the magnet size.

[0027] The positioning column 7 is provided with guide blocks 7, 8 between the fixed plates 2, 9. The hollow cross-shaped design of the guide blocks 7, 8 matches the steps of the positioning column 7, which can accurately guide the bonded magnet into the processing position. This structure ensures that the magnet always maintains the correct posture and position during processing, reduces the dimensional error caused by position deviation, and significantly improves the processing accuracy and dimensional consistency.

[0028] The hollow part of the guide blocks 7, 8 is designed as a tapered slide, which can make the magnet more smoothly aligned when entering the processing area. The design of the tapered slide not only reduces the friction between the magnet and the guide blocks 7, 8, but also effectively avoids the jamming or deviation of the magnet when entering the processing position, further reducing the processing error.

[0029] The guide blocks are located between the positioning column 7 and the fixed plates 2, 9, which play a role in buffering and supporting. This design can reduce the displacement of the magnet caused by vibration or impact during processing, ensuring the stability of the processing process. At the same time, the cross-shaped structure of the guide blocks 3, 8 matches the steps of the positioning column 7, enhancing the rigidity of the entire device and further improving the reliability of the processing.

[0030] The hollow cross-shaped structure of the guide blocks 3, 8 can adapt to bonded magnets of different shapes and sizes, making it flexible to apply to various processing scenarios. This design not only improves the versatility of the device, but also allows the processing of magnets of various specifications without changing the device, improving production efficiency. The tapered slide design of the guide blocks 3, 8 can reduce direct friction between the magnet and the device, reducing wear. This structure not only protects the surface quality of the magnet, but also reduces the wear of the device itself, prolongs the service life of the device, and reduces maintenance costs.

[0031] Through the precise guidance of the guide blocks 3, 8, the magnet can quickly and accurately enter the processing position, reducing the adjustment time before processing and the repeated processing caused by inaccurate position. This design significantly improves processing efficiency, especially in batch production, which can significantly shorten the production cycle and improve production efficiency.

[0032] The cross-sectional design of the guide blocks 3, 8 is a hollow cross-shaped cylinder, and the cross-shaped part matches the steps of the positioning column 7.

[0033] Firstly, the hollow cross-shaped design can provide accurate guidance and stable support for the bonded magnet. The four branches of the cross-shaped structure can evenly distribute the weight of the magnet and the force generated during processing, ensuring that the magnet maintains a stable position during processing, reducing vibration and deviation. This design is particularly suitable for high-precision processing scenarios, which can significantly improve processing accuracy and dimensional consistency.

[0034] Secondly, the matching design of the cross-shaped part and the step of the positioning column 7 allows the guide block 3, 8 to fit tightly with the positioning column 7. This fit not only enhances the overall rigidity of the device, but also ensures that the magnet can be quickly and accurately aligned when entering the processing area, reducing processing errors caused by positional deviation. At the same time, this design also improves the versatility and flexibility of the device, allowing it to adapt to bonded magnets of different sizes and shapes, further expanding the application range of the device.

[0035] In addition, the hollow cross-shaped guide block 3, 8 also has good guiding performance. The hollow part inside provides a smooth channel for the magnet, while the cross-shaped branches effectively limit the lateral movement of the magnet, ensuring that the magnet enters the processing position along the predetermined trajectory. This design not only improves processing efficiency, but also reduces the rate of repeated processing or defective products caused by magnet deviation.

[0036] Finally, this structural design also has a certain buffering effect. During processing, there may be a certain impact force between the magnet and the device, and the hollow cross-shaped guide block 3, 8 can absorb these impact forces to some extent, reducing damage to the device, thereby prolonging the service life of the device and reducing maintenance costs.

[0037] The hollow part of the guide block 3, 8 is a sliding block with a certain taper, with a taper of ∠1:100. The diameter of the fixed plate 2, 9 is much larger than the diameter of the positioning column 7.

[0038] The hollow part of the guide block 3, 8 is designed as a sliding block with a taper, and the diameter of the fixed plate 2, 9 is much larger than the diameter of the positioning column 7. These two designs significantly improve the performance of the bonded magnet processing device. The tapered sliding block improves guiding accuracy and device stability by reducing friction and automatically correcting magnet position, while enhancing the adaptability of different specifications of magnets. The large-diameter fixed plate 2, 9 provides a wider support area, enhancing the overall stability and rigidity of the device, reducing vibration and stress concentration during processing, and prolonging the service life of the device. These two designs together optimize the processing environment, improve processing accuracy and efficiency, and are important innovations in achieving high-precision bonded magnet processing.

[0039] The positioning column 7 is provided with a counterbore, and the positioning column 7 is connected to the fixed plate 2, 9 by bolts.

[0040] Firstly, the counterbore design allows the bolt head to be completely sunk into the interior of the positioning column 7, so that the bolt head is flush with or below the surface of the device, thereby avoiding obstacles and safety hazards caused by protruding parts. This design not only improves the aesthetics of the device, but also provides a smoother surface for subsequent processing or installation operations.

[0041] Secondly, the positioning column 7 is connected with the fixed plates 2 and 9 through bolts, which can realize quick and reliable assembly and disassembly. This connection method not only improves the installation efficiency of the device, but also facilitates maintenance and replacement of parts. At the same time, the bolt connection can provide stable mechanical connection strength, enhance the overall rigidity and stability of the device.

[0042] In addition, the design of the counterbore can also disperse the pressure of the bolt head, reduce stress concentration, and thus improve the durability and service life of the device. This design is widely used in machining and structural connection, as it can effectively improve the stability and reliability of the structure.

[0043] Each circular cutter is provided with a cutting portion with a 5° arc and a front end thickness less than 0.2mm.

[0044] Firstly, the 5° arc design can optimize the stress distribution during cutting, making the cutting force more evenly act on the magnet surface, thereby reducing vibration and impact during cutting, improving the stability and precision of machining. Secondly, the cutting portion with a front end thickness less than 0.2mm can achieve more precise machining, reduce cutting allowance, avoid size deviation caused by excessive cutting, and ensure the size accuracy and surface quality of the magnet. In addition, this design can also reduce the damage to the magnet during cutting, reduce machining stress, prolong the service life of the cutter, improve the machining efficiency, and reduce the production cost. Overall, this cutting portion design significantly improves the precision, efficiency and quality of bonded magnet machining, and is the key optimization for high-precision machining.

[0045] The device is provided with a matching pressure rod 1, and the product is cut by the pressure rod 1.

[0046] Firstly, the pressure rod 1 can provide stable pressing force for the product, ensuring that the product remains fixed during cutting, avoiding machining errors caused by vibration or displacement, thereby significantly improving machining precision and size consistency. Secondly, the use of the pressure rod 1 realizes automatic and continuous machining process, reduces manual intervention, improves production efficiency, and is especially suitable for batch production scenarios. In addition, cutting by the pressure rod 1 can better control the cutting depth and force, reduce cutter wear, prolong cutter service life, and reduce energy consumption and cost during machining. This design also enhances the versatility and flexibility of the entire device, making it suitable for processing products of different shapes and sizes, further expanding the application range and economy of the device. Overall, the design of the matching pressure rod 1 not only improves machining precision and efficiency, but also reduces production cost, enhances the reliability and versatility of the device, and is an important innovation for high-efficiency and high-precision machining.

[0047] The structural design of the device is also highly innovative. The positioning column 7 is a hollow cylinder with steps at the top and bottom, matched with the hollow cross-shaped guide blocks 3, 8, which can ensure the stable positioning of the magnet during the machining process. The hollow part of the guide block 3, 8 has a taper and is designed in the form of a sliding block, which can better guide the magnet into the machining position and reduce the dimensional error caused by position deviation. This design not only improves the stability of machining, but also reduces the rate of defective products caused by vibration or inaccurate position.

[0048] In addition, the device is also equipped with a matching pressure bar 1, and the product is pressed out for cutting through the pressure bar 1. This design realizes continuous machining and greatly improves production efficiency. The diameter of the fixed plate 2, 9 is much larger than the diameter of the positioning column 7, and is connected with the positioning column 7 through bolts, which ensures the stability of the device and further reduces the vibration during the machining process, improving the machining precision.

[0049] This device not only can significantly improve the dimensional accuracy of bonded magnets, but also can reduce production cost. Bonded magnets have the characteristics of one-time forming and multi-pole orientation, and this device further reduces the subsequent processing requirements and reduces production cost. At the same time, the device is suitable for batch production, which can improve the dimensional consistency and production efficiency, and reduce the processing cost per unit product. Through optimizing the structure design and processing technology, the device can reduce the wear of the magnet during the machining process, improve the surface quality and service life of the product, thereby improving the product quality and enhancing the market competitiveness of the product.

[0050] First, by positioning the circular cutter and the magnet with the outer sleeve, the cutting amount of each part is uniform when the magnet is cut; second, by copying the blade structure, circular cutting is realized, and the magnet is extruded through the cutter to realize the cutting of the surface of the magnet, and the cutting amount is about 0.01mm each time, which can effectively ensure the surface finish of the product. Third, through the combination of different sizes of circular cutters, cutting within a certain range can be realized, which improves the dimensional accuracy of different batches of magnets.

[0051] The protection scope of the utility model is not limited to the specific embodiments described in the text, but is determined by the appended claims and the equivalents recognized by the Patent Law. This means that all technical solutions that are the same or equivalent in principle and spirit to the utility model are within the protection scope of the utility model. Therefore, the innovation and practicality of the utility model are not limited to the current form, but also include all possible, reasonable derivatives and extensions.

Claims

1. An apparatus for improving dimensional accuracy of bonded magnets, comprising: The positioning column and the circular cutter are included, the positioning column is a hollow cylinder, steps are arranged on the positioning column, the circular cutter is arranged in the middle of the positioning column, and fixed plates are arranged on the positioning column. The circular cutter is provided with multiple levels, the size of each level of the circular cutter is different by 0.02-0.05 mm, and the circular cutters are placed in the positioning column from large to small.

2. The device for improving the dimensional accuracy of bonded magnets according to claim 1, wherein A guide block is arranged in the middle of the positioning column and the fixed plate.

3. A device for improving the dimensional accuracy of bonded magnets according to claim 2, wherein The guide block is a hollow cross-shaped cylinder, and the cross-shaped part is matched with the steps of the positioning column.

4. A device for improving the dimensional accuracy of bonded magnets according to claim 2 or 3, characterized in that The hollow part of the guide block is a sliding block with a taper.

5. The device for improving the dimensional accuracy of bonded magnets according to claim 1, wherein The positioning column is provided with a counterbore, and the positioning column is connected with the fixed plate through bolts.

6. A device for improving the dimensional accuracy of bonded magnets according to claim 2 or 5, characterized in that The diameter of the fixed plate is much larger than the diameter of the positioning column.

7. The device for improving the dimensional accuracy of bonded magnets according to claim 1, wherein Each circular cutter is provided with a cutting part with an arc of 5° and a front end thickness of less than 0.2 mm.

8. The device for improving the dimensional accuracy of bonded magnets according to claim 1, wherein The device is provided with a matched pressing rod, and the product is pressed out by the pressing rod for cutting.

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