A super-precision polishing equipment for soft magnetic ferrite core production

Abstract

The application discloses a super-precision polishing equipment for soft magnetic ferrite core production and mainly relates to the technical field of super-precision grinding. The equipment comprises a part-intersecting grinding disc and a rotating disc, a plurality of work station holes are penetrated through the rotating disc, an annular tray is arranged below the rotating disc, the work station holes comprise interconnected inner hole positions and outer hole positions, the inner hole positions are small and the outer hole positions are large, the rotating disc comprises upper and lower double-layer disc pieces which synchronously rotate on the same axis, arc-shaped positioning pieces which are arranged between the two disc pieces are stopped, the positioning pieces are located in the intersection area of the grinding disc and the rotating disc, the end face of the positioning piece which is close to the axis of the rotating disc is a circular arc-shaped positioning curved surface which is coaxial with the rotating disc, the minimum distance between the inner hole position and the axis of the rotating disc is d, the difference between the radius of the positioning curved surface and d corresponds to the diameter of the magnetic core workpiece, and the two ends of the positioning piece are provided with guide pieces which are bent away from the center of the rotating disc. The application has the beneficial effects that continuous and efficient operation in double-end surface machining is realized, automatic feeding and discharging are supported, and the machining precision is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of ultra-precision grinding technology, specifically to an ultra-precision grinding equipment for the production of soft magnetic ferrite cores. Background Technology

[0002] Soft ferrite cores are magnetic cores made of ferrite materials with soft magnetic properties. Soft magnetic materials are characterized by high permeability, low coercivity, and rapid magnetization and demagnetization in response to changes in the magnetic field. Soft ferrite cores are widely used in electronic components such as transformers and inductors for efficient storage and transfer of magnetic energy. Manganese-zinc soft ferrite cores are a specific type of soft ferrite core. They are mainly composed of oxides of manganese, zinc, and iron, and have a spinel structure. This structure allows them to exhibit high permeability and low loss in the low- and mid-frequency range (e.g., tens to hundreds of kilohertz). In specific applications, depending on the application scenario, manganese-zinc soft ferrite cores are commonly found in cylindrical or toroidal shapes. Their processing mainly involves molding, demolding, and firing, and also requires fine surface polishing. The purpose of precision grinding is twofold: firstly, to ensure that the outer diameter, inner diameter, and thickness of the magnetic core meet design requirements, and that the performance and dimensions of magnetic cores from the same batch remain highly consistent to ensure the stability and reliability of the equipment; secondly, to ensure that the surface is smooth and free of cracks to reduce eddy current losses and improve magnetic properties. Improper surface treatment or insufficient precision will directly affect magnetic properties and degrade equipment performance.

[0003] In existing fine grinding processes, the main problem remains the precision of the process. The equipment used includes various grinding machines, and although the level of CNC and automation is relatively advanced, it is still difficult to improve flatness, perpendicularity, and surface roughness. This is mainly reflected in the following aspects:

[0004] Firstly, in the precision grinding of ring-shaped parts, the perpendicularity of the end faces has always been a challenging problem in this process. Currently, for the end face machining of small parts, commonly used double-face grinding equipment, whether vertical or horizontal, struggles to guarantee the perpendicularity of the outer diameter relative to the two end faces. Therefore, many manufacturers cannot afford double-face grinding equipment and must first machine one end face, then use that as a reference to machine the other. However, even this method still fails to achieve satisfactory machining accuracy. This is mainly because: Firstly, if the perpendicularity of the first end face is poor during machining, the error on the second end face will be magnified exponentially during grinding. Secondly, bumps and scratches can occur during the transfer between different processes, and the more transfer points there are, the greater the probability of error accumulation, all of which drag down the final accuracy. Furthermore, this machining method not only adds steps but also requires re-turning and re-sorting the material, leading to increased time and complexity, and raising costs and time.

[0005] Secondly, magnetic core workpieces are often small in size but produced in large quantities. On the one hand, processing efficiency is a key focus of production accounting. The large production volume and the rigid demands for both efficiency and precision place high demands on cost configuration. Ordinary equipment, while meeting the precision requirements, suffers from low efficiency; conversely, with stable efficiency, precision is significantly reduced. Balancing both becomes unbalanced and requires substantial investment, causing headaches for manufacturers. On the other hand, the small size of the workpieces presents challenges in material handling, with significant costs in sorting, feeding, and alignment. For example, in the workpiece transfer and sorting stages, existing technologies largely rely on high-precision mechanical grippers. These complex devices often require visual recognition and data feedback, making clamping difficult and recognition challenging, leading to frequent production stoppages and errors. Furthermore, they demand highly skilled technicians and incur high costs for equipment maintenance and configuration.

[0006] In summary, the complexity of the process makes it difficult to achieve the desired processing accuracy in the polishing process, as the process is too complicated and it is difficult to balance cost, efficiency, and precision. Summary of the Invention

[0007] The purpose of this invention is to provide an ultra-precision grinding equipment for the production of soft magnetic ferrite cores, which enables continuous and efficient operation in double-end face processing, supports automated loading and unloading, and greatly improves processing accuracy.

[0008] To achieve the above objectives, the present invention employs the following technical solution:

[0009] An ultra-precision grinding device for producing soft magnetic ferrite cores includes a partially intersecting grinding disc and a rotary table. The grinding disc comprises an upper grinding disc and a lower grinding disc that are concentric and correspond to each other vertically. Multiple workstation holes are penetrating the discs, and the intersection area of ​​the rotary table and the grinding discs can simultaneously cover at least one workstation hole. An annular tray, no smaller than the rotary table, is provided below the rotary table. The upper surface of the annular tray is adapted to the upper surface of the lower grinding disc, and the edge of the annular tray has an arc-shaped notch adapted to the intersection area of ​​the grinding discs.

[0010] The work station hole includes an inner hole and an outer hole that are connected. The line connecting the centers of the inner hole and the outer hole corresponds to the diameter of the turntable. The inner diameter of the inner hole corresponds to the outer diameter of the magnetic core workpiece. The inner diameter of the outer hole is larger than the inner diameter of the inner hole. The turntable includes upper and lower double-layered discs that rotate synchronously on the same axis. An arc-shaped positioning plate is provided between the two discs to stop the movement. The positioning plate is located in the intersection area of ​​the grinding disc and the turntable. The end face of the positioning plate near the axis of the turntable is an arc-shaped positioning surface that is coaxial with the turntable. The minimum distance between the inner hole and the axis of the turntable is d. The difference between the radius of the positioning surface and d corresponds to the diameter of the magnetic core workpiece. Guide plates that bend away from the center of the turntable are provided at both ends of the positioning plate. The end of the guide plate away from the positioning plate is located at the edge of the turntable.

[0011] A vertically extending feed cylinder is provided above the turntable. The bottom end of the feed cylinder is provided with a circular feed port. The diameter of the feed port is not greater than the inner diameter of the outer hole, but greater than the inner diameter of the inner hole. The center distance between the feed port and the turntable is the same as the center distance between the outer hole and the turntable. The distance between the feed port and the upper surface of the turntable is less than 1 / 2 the height of the workpiece, and the distance between the feed port and the upper surface of the tray is greater than the height of one workpiece.

[0012] The strip frame includes two parallel optical rods, the maximum distance between the two optical rods being adapted to the width of the workpiece slot, the optical rod closer to the friction plate being lower than the other optical rod, the bottom of the receiving groove being an inclined surface sloping downward toward the friction plate, and both the friction plate and the groove wall being perpendicular to the bottom of the receiving groove.

[0013] It also includes a machine tool host, on which a fixed base is fixed. The turntable is rotatably mounted relative to the fixed base. The fixed base has a circular mounting hole in the center. An annular seat extending vertically upward is fixed in the mounting hole. The fixed base and the annular seat are respectively provided with clearance structures corresponding to the space occupied by the grinding disc. The positioning plate is symmetrically arranged relative to the center line connecting the grinding disc and the turntable. The top side of the positioning plate is close to the upper disc, and the bottom side of the positioning plate is close to the lower disc. A support frame is provided on the outer side of the positioning plate and / or the guide plate. The bottom end of the support frame is fixed to the fixed base.

[0014] The tray has a feeding notch away from the grinding disc, and a receiving groove is provided below the feeding notch. The width of the receiving groove is adapted to the diameter of the workpiece. The receiving groove is an inclined groove with the top end near the tray. A rectangular notch corresponding to its width is provided in the middle or lower part of the bottom of the receiving groove. A strip frame adapted to the width of the slot on the end face of the workpiece is fixed in the center of the rectangular notch. A friction plate is provided on one side of the rectangular notch. The end of the friction plate near the bottom of the receiving groove has a distributing port that penetrates the groove wall. When the strip frame is inserted into the slot on the end face of the workpiece, the top surface of the workpiece is lower than the top side of the distributing port.

[0015] The bottom end of the receiving groove is connected to a buffer groove that extends inclined in the same direction. A friction wheel driven by a motor is rotatably mounted on one side of the buffer groove. A guide member passes through the center of the bottom opening of the buffer groove. The width of the guide member is adapted to the width of the workpiece slot. The end of the guide member near the buffer groove is tapered. When the circumferential surface of the workpiece contacts the tapered tip of the guide member, the circumferential surface of the workpiece simultaneously contacts the friction wheel. The end of the guide member away from the buffer groove is equipped with a grinding wheel that rotates under motor control. The outer cross-section of the grinding wheel is consistent with the design shape of the workpiece slot.

[0016] The outer side of the material distribution port is provided with a material distribution groove fixed to the receiving groove. The bottom of the material distribution groove near the receiving groove extends into the lower part of the material distribution port. The width of the material distribution groove corresponds to the diameter of the workpiece. The end of the material distribution groove near the receiving groove is the top. The material distribution groove slopes downward away from the receiving groove. The end of the material distribution groove away from the receiving groove is connected to a guide channel integrally formed therewith. The guide channel is a closed structure. The inner cavity of the guide channel is adapted to the shape of the workpiece. The guide channel is an arc-shaped channel with a 90-degree arc bend. The bottom end of the guide channel is a vertically extending vertical channel. The bottom end of the guide channel is also connected to a buffer groove.

[0017] The guide and the grinding wheel are symmetrically provided with belt mechanisms on both sides. The belt mechanism includes a machine plate, and the two ends of the machine plate are respectively installed with pulleys that are vertical in the axial direction. A loop belt is wound between the two pulleys on the same side, and the minimum distance between the belts on both sides corresponds to the diameter of the workpiece.

[0018] The bottom end of the buffer groove is provided with a slide connected thereto. The slide extends horizontally, and the top surface of the slide is coplanar with the bottom of the buffer groove.

[0019] The top of the feeding cylinder is connected to a fixed feeding trough, which is an inclined chute, and the bottom of the feeding trough is connected to the feeding cylinder.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] By employing a specially designed workstation with varying hole sizes, combined with the positioning aids of locating plates in the grinding area, both precision and efficiency are improved. On one hand, the larger outer hole allows for smooth workpiece insertion, facilitating loading and unloading under natural gravity and providing a prerequisite for automated loading and unloading. On the other hand, the inner hole, matched to the workpiece height, enhances precision. Furthermore, the clamping of the workpiece on opposite sides by the inner hole and the locating curved surface ensures its verticality, resolving the perpendicularity issue in end-face machining. Thus, through simple operations, the configuration cost of high-precision grinding is reduced, while process accuracy is improved. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the present invention (excluding the main unit other than the grinding wheel and turntable).

[0023] Figure 2 This is the present invention. Figure 1 A top view (perspective effect).

[0024] Figure 3 This is the present invention. Figure 2 AA sectional view.

[0025] Figure 4This is the present invention. Figure 1 A schematic diagram of component breakdown.

[0026] Figure 5 This is the present invention. Figure 1 The bottom diagram.

[0027] Figure 6 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0028] Figure 7 This is a schematic diagram of the internal structure of Embodiment 1 of the present invention (with the grinding disc and turntable removed).

[0029] Figure 8 This is a cross-sectional schematic diagram of the present invention at the material guide channel.

[0030] Figure 9 This is a schematic diagram of the buffer tank and its downstream structure of the present invention.

[0031] Figure 10 This is the present invention. Figure 9 Top view.

[0032] The labels shown in the attached diagram:

[0033] 1. Upper grinding disc; 2. Lower grinding disc; 3. Turntable; 4. Rotating shaft; 5. Station hole; 6. Inner hole; 7. Outer hole; 8. Fixed seat; 9. Annular seat; 10. Tray; 11. Arc-shaped notch; 12. Material discharge notch; 13. Positioning plate; 14. Guide plate; 15. Support frame; 16. Material discharge cylinder; 17. Feeding trough; 18. Receiving trough; 19. Rectangular notch; 20. Strip frame; 21. Friction plate; 22. Material distribution port; 23. Material distribution trough; 24. Material guide channel; 25. Buffer trough; 26. Guide component; 27. Friction wheel; 28. Belt mechanism; 29. ​​Belt; 30. Grinding wheel; 31. Slide. Detailed Implementation

[0034] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined in this application.

[0035] Unless otherwise specified, the instruments, reagents, and materials used in the following embodiments are all conventional instruments, reagents, and materials already available in the prior art and can be obtained through legitimate commercial channels. Unless otherwise specified, the experimental methods and detection methods used in the following embodiments are all conventional experimental methods and detection methods already available in the prior art.

[0036] Example:

[0037] The grinding process for workpieces essentially includes peripheral grinding and end grinding. Peripheral grinding is relatively simple and has extremely high processing efficiency, so existing grinding equipment (such as centerless grinders) and grinding methods can be used. This example mainly focuses on improving the ultra-precision machining of end faces.

[0038] For end-face machining of toroidal magnetic cores, the primary concern is ensuring the perpendicularity of the end face to the circumferential surface, followed by the smoothness of the end face. While improvements to existing grinding equipment have addressed the issue of end-face smoothness (verified through roughness data), the long-standing challenge has been maintaining the axial perpendicularity of the end face. This is especially true when a slot exists on the end face (commonly found on one end of a toroidal magnetic core for winding installation or positioning), requiring grinding within the slot. Therefore, this equipment primarily comprises two processes: end-face grinding and positioning grinding. The main structure of this equipment, corresponding to these two processes, includes an end-face grinding mechanism and a positioning grinding mechanism.

[0039] I. End face grinding mechanism

[0040] It is mainly used to perform end face grinding processes, solving the accuracy and efficiency problems in the end face machining of toroidal magnetic cores.

[0041] In double-sided grinding equipment, whether vertical or horizontal, the first step is to load the workpiece at a station (sometimes a hole station, sometimes a groove station). After the workpiece is positioned, the back disc moves it between the grinding discs for end-face grinding. To ensure smooth loading and unloading, a certain gap is necessary between the station and the workpiece, inevitably compromising perpendicularity in double-sided grinding. Furthermore, to avoid excessive loss of end-face grinding accuracy, current double-end grinding machines rely on manual loading. Even imported Japanese grinding machines struggle to achieve automated loading and unloading and continuous production lines for double-end grinding.

[0042] The end face grinding mechanism includes a machine tool host, on which a grinding disc and a turntable 3 are installed that cooperate with each other.

[0043] The structure of the machine tool host is consistent with the structure of the existing technology. The installed grinding disc is a grinding wheel 30 grinding disc, which includes an upper grinding disc 1 and a lower grinding disc 2 driven by a motor. The bottom surface of the upper grinding disc 1 is the upper working surface, and the top surface of the lower grinding disc 2 is the lower working surface. The working surfaces of the upper grinding disc 1 and the lower grinding disc 2 are opposite to each other and horizontally arranged for grinding the workpiece.

[0044] The turntable 3 is rotatably mounted on one side of the grinding disc. Multiple workstation holes 5 are through the turntable 3. The workstation holes 5 are arranged in a circumferential array relative to the turntable 3. The turntable 3 is located between the upper grinding disc 1 and the lower grinding disc 2. The turntable 3 intersects with the grinding disc and has an intersection area. This intersection area can accommodate at least two workstation holes 5 at the same time.

[0045] The turntable 3 comprises two concentric discs, each with a corresponding workstation hole 5. A rotating shaft 4 is fixedly connected to the center of the two discs, causing the two discs to rotate synchronously or stop. A flange is centrally located on each disc, and long bolts passing through the upper and lower flanges reinforce the discs, ensuring high-precision alignment of the workstation holes 5. An annular groove structure is formed between the two discs along their edges, covering all the workstation holes 5 based on the above installation method.

[0046] A fixed base 8 is provided below the turntable 3, which is fixedly installed relative to the machine tool host. The turntable 3 is rotatably installed relative to the fixed base 8. A motor is installed below the fixed base 8. The output shaft of the motor is connected to the bottom end of the rotating shaft 4 to drive the turntable 3 to rotate. A circular mounting hole is provided in the center of the fixed base 8 to facilitate the installation of the rotating shaft 4 and the motor. An annular seat 9 extending vertically upward is fixed on the mounting hole. Based on the positional relationship between the turntable 3 and the grinding disc, the fixed base 8 and the annular seat 9 are respectively provided with clearance structures to occupy the grinding disc, so that the fixed base 8 and the annular seat 9 do not contact the grinding disc, which facilitates the grinding disc operation.

[0047] The top of the annular seat 9 is fixed with an annular tray 10. The top surface of the annular tray 10 is a smooth horizontal support surface. The support surface is set close to the bottom surface of the lower plate to support the bottom end face of the workpiece. The outer circle of the annular tray 10 corresponds to the turntable 3. The inner diameter of the inner circle of the tray 10 is smaller than the minimum distance from the station hole 5 to the center of the turntable 3, so that the support surface can cover all station holes 5.

[0048] The tray 10 is provided with an arc-shaped notch 11 that corresponds to the shape of the grinding disc at the adjacent position to make room for the grinding disc. The supporting surface of the tray 10 corresponds to the lower working surface of the lower grinding disc 2, which facilitates connection and support of the workpiece.

[0049] The tray 10 is provided with a feeding notch 12 on the side away from the grinding disc. The feeding notch 12 is used to drop the magnetic core workpiece located in the station hole 5.

[0050] The workstation hole 5 includes an inner hole position 6 and an outer hole position 7 that are connected. The line connecting the centers of the inner hole position 6 and the outer hole position 7 corresponds to the diameter of the turntable 3. The inner diameter of the inner hole position 6 corresponds to the outer diameter of the magnetic core workpiece. The inner diameter of the outer hole position 7 is larger than the inner diameter of the inner hole position 6, and therefore is also significantly larger than the size of the workpiece, so that the workpiece can fall smoothly into the outer hole position 7.

[0051] The outer hole is designed to facilitate loading. Because it is significantly larger than the workpiece size, it allows the workpiece to fall smoothly into the machine, enabling both manual and automated loading. Currently, the station hole 5 of existing double-end face grinders cannot be excessively loosened after mating with the workpiece, making workpiece placement difficult. Automated loading relies on a robotic arm to insert the workpiece downwards, but robotic arms are expensive, significantly increasing the overall cost of the equipment. Therefore, existing equipment uses only manual loading. However, by setting the size of the holes, allowing the outer hole 7 to be significantly larger to accommodate the workpiece, the loading problem in automated production can be solved.

[0052] An arc-shaped positioning piece 13 is provided within the annular groove structure. The end face of the positioning piece 13 near the axis of the turntable 3 is an arc-shaped curved surface coaxial with the turntable 3, defined as the positioning curved surface. The top side of the positioning piece 13 is close to the upper disk, and the bottom side of the positioning piece 13 is close to the lower disk. The positioning piece 13 is located within the grinding disc, so the positioning piece 13 is located in the intersection area of ​​the grinding disc and the turntable 3, and preferably is symmetrically arranged relative to the line connecting the centers of the grinding disc and the turntable 3. The minimum distance between the inner hole position 6 and the axis of the turntable 3 is d, and the radius of the positioning curved surface is R. The difference between the radius of the positioning curved surface and d corresponds to the diameter of the magnetic core workpiece. When the workpiece in the station hole 5 comes into contact with the positioning curved surface, the positioning curved surface squeezes the workpiece against the inner hole position 6. Based on the matching of the inner hole position 6 and the outer diameter height of the workpiece, the workpiece is kept vertical by the clamping of the positioning curved surface and the inner hole position 6 on both sides. Under this state, the machining of the upper and lower end faces can improve the guarantee of verticality.

[0053] The positioning plate 13 has guide plates 14 at both ends that bend away from the center of the turntable 3. The end of the guide plate 14 away from the positioning plate 13 is located at the edge of the turntable 3. As the turntable 3 rotates, the workpiece located in the work station hole 5 is guided by the guide plate 14 and gradually moves towards the inner hole 6, and is finally clamped by the positioning plate 13 and the inner hole 6.

[0054] The specially designed workstation hole 5 with its varying hole size, combined with the positioning aid 13 in the grinding area, facilitates the loading and unloading of workpieces (outer hole 7) and further improves the fit between the inner hole 6 and the workpiece, eliminating concerns about workpiece jamming. The inner hole 6 and the positioning curved surface clamp the workpiece on opposite sides, ensuring its vertical position and solving the perpendicularity problem in end-face machining.

[0055] The positioning piece 13 and the guide piece 14 are integrally formed sheet metal pieces. A support frame 15 is provided on the outer side of the positioning piece 13 and the guide piece 14. The bottom end of the support frame 15 is fixed on the fixing seat 8 to realize the installation and fixing of the positioning piece 13 and the guide piece 14.

[0056] A vertically extending feed cylinder 16 is provided above the turntable 3. The bottom end of the feed cylinder 16 has a circular feed opening. The distance between the feed opening and the top surface of the turntable 3 is less than 1 / 2 the height of the workpiece, and the distance between the feed opening and the support surface is greater than the height of one workpiece. The diameter of the feed opening corresponds to the inner diameter of the outer hole 7, or is between the inner diameter of the outer hole 7 and the inner diameter of the inner hole 6. The center distance between the feed opening and the turntable 3 is the same as the center distance between the outer hole 7 and the turntable 3. Therefore, when the turntable 3 rotates and the station hole 5 is located below the feed cylinder 16, the workpiece falls naturally into the outer hole 7 by gravity and moves with the turntable 3.

[0057] The top of the feeding cylinder 16 is connected to a fixed feeding trough 17, and the bottom of the feeding trough 17 is connected to the feeding cylinder 16. The feeding trough 17 is an inclined chute, and the workpiece moves into the feeding cylinder 16 within the feeding trough 17 based on gravity. The width of the feeding trough 17 is adapted to the diameter of the workpiece, and is slightly larger than the diameter of the workpiece, so as to facilitate the workpiece sliding down and avoid the workpieces piling up side by side.

[0058] The top of the feeding trough 17 can be connected to the conveyor belt of the previous process to realize automated feeding.

[0059] Based on the above structure, a breakthrough in automation of loading and unloading in the double-end grinding process has been achieved. Automated loading can be achieved without the use of robotic arms, employing the simplest and lowest-cost chute structure. This significantly reduces configuration costs and maintenance difficulty, saving labor.

[0060] II. Positioning Grinding Mechanism

[0061] This process involves positioning and grinding the horizontal slots located on the end face. After the workpiece is demolded and ejected from the cavity, the positions of the slots are quite chaotic during the transport of a large number of falling workpieces. The main difficulty in grinding these slots lies in accurately positioning them. Currently, this step involves manual picking and alignment at multiple stations on the production line. This is not only labor-intensive and time-consuming, but also prone to errors that can cause the entire line to stop.

[0062] This mechanism includes a receiving groove 18, the width of which is adapted to the diameter of the workpiece. The receiving groove 18 is a U-shaped inclined groove, and its top end is located below the unloading notch 12. The receiving groove 18 extends downwards at an angle away from the grinding disc, forming a chute structure. When the workpiece moves with the turntable 3 to the unloading notch 12, it naturally falls into the receiving groove 18 below and gradually slides downwards as the receiving groove 18 tilts slightly.

[0063] Near the lower end of the receiving groove 18, a rectangular notch 19 with a width adapted to its dimensions is provided. A strip frame 20, with a width adapted to the slot width of the workpiece end face, is fixed centrally at the rectangular notch 19. A friction plate 21 is provided on one side of the rectangular notch 19, and a raised rubber strip is provided on the inner end face of the friction plate 21 to provide friction when in contact with the workpiece's circumference, allowing it to rotate. A distributing port 22 is provided at the end of the friction plate 21 near the bottom of the receiving groove 18. The width of the distributing port 22 is adapted to the width of the workpiece. The distributing port 22 penetrates the wall of the receiving groove 18. The distance from the top side of the distributing port 22 to the strip frame 20 is less than the height of the workpiece and slightly greater than the difference between the workpiece height and the slot depth. This ensures that when the strip frame 20 is inserted into the slot on the bottom surface of the workpiece, the top surface of the workpiece is lower than the top side of the distributing port 22, allowing it to exit through the distributing port 22. The total length of the material distribution port 22 and the friction plate 21 is adapted to the strip frame 20. The workpiece located on the strip frame 20 first passes through the friction plate 21 and then through the material distribution port 22.

[0064] The strip frame 20 can be a single long bar or multiple parallel straight bars, as long as its width is slightly smaller than the width of the groove on the workpiece end face. In this example, two smooth bars are used to form the strip frame 20. The maximum distance between the two smooth bars is adapted to the width of the workpiece groove, and the smooth bar closer to the friction plate 21 is positioned slightly lower than the other smooth bar, so that the workpiece falling on the two smooth bars always remains tilted towards the friction plate 21 and is smoothly separated from the material distribution port 22.

[0065] The bottom of the receiving groove 18 is preferably a downward sloping surface near the friction plate 21, so that the workpiece on the receiving groove 18 remains in contact with the groove wall of the receiving groove 18 on the side where the friction plate 21 is located. Furthermore, both the friction plate 21 and the groove wall of the receiving groove 18 are preferably perpendicular to the bottom of the receiving groove 18, which is more conducive to the contact of the workpiece's circumference. This also helps maintain the workpiece's inclination towards the friction plate 21 while it slides on the strip frame 20, allowing it to fall naturally when it encounters the dispensing port 22.

[0066] Based on the above structure, after the workpiece falls into the receiving groove 18, as the workpiece slides towards the bottom of the receiving groove 18, it rests against the side wall of the groove with the friction plate 21. Then, the workpiece continues to rest against the friction plate 21 and slides downward on the strip frame 20. During the sliding, it rotates circumferentially through contact with the friction plate 21. When the workpiece's slot is on the top surface, no matter how it rotates, under the constraint of the two side walls of the receiving groove 18 and the support of the strip frame 20, the workpiece can pass smoothly through the receiving groove 18. When the workpiece's slot is on the bottom surface of the groove, as the workpiece rotates axially and slides downward, when the slot on the bottom surface of the workpiece rotates to the same direction as the strip frame 20, the workpiece will fall into the slot of the strip frame 20 and slide in this state under the guidance of the strip frame 20 and the receiving groove 18. When it passes the dispensing port 22, it falls out from the dispensing port 22.

[0067] The outer side of the material distribution port 22 is provided with a material distribution groove 23 fixed to the receiving groove 18. The bottom of the material distribution groove 23 near the receiving groove 18 extends into the bottom of the material distribution port 22. The width of the material distribution groove 23 corresponds to the diameter of the workpiece. The end of the material distribution groove 23 near the receiving groove 18 is the top. The material distribution groove 23 is inclined downward in the direction away from the receiving groove 18, so that the workpiece falling on the material distribution groove 23 is conveyed in the direction away from the receiving groove 18.

[0068] The end of the material distribution groove 23 furthest from the receiving groove 18 is connected to an integrally formed guiding channel 24. The guiding channel 24 is a closed structure, and its inner cavity conforms to the circumferential shape of the workpiece. The guiding channel 24 is an arc-shaped channel with a 90-degree arc bend, and its top end is connected to the bottom end of the material distribution groove 23. Its bottom end is a vertically extending channel. When the workpiece falls into the material distribution groove 23 from the material distribution port 22 (e.g.) Figure 6-8 As shown in the diagram, the material slides down the distribution groove 23 to the guide channel 24. As the guide channel 24 slides down, it flips over to a straight groove-up position. Ideally, the bottom side of the guide channel 24 should have a flat sliding surface (for easy docking with the distribution groove 23), and the top side of the guide channel 24 should have a curved constraint surface (for better compatibility with the workpiece). This makes the design of the guide channel 24 more reasonable. It is not limited to this example; other square cross-section channels can also be used, as long as the side length of the square channel is compatible with the diameter of the workpiece.

[0069] Based on the above structure, the workpiece with the slot on the bottom is identified when passing through the rectangular notch 19, and the workpiece with the slot on the bottom is separated through the material distribution port 22. It is then flipped to the top by turning it into an upright state through the material guide channel 24. The sorting and flipping processes that are complex in existing technologies are completed through a simple chute feeding process, replacing manual labor and eliminating the need for visual recognition and robotic arms. It is highly efficient, simple to operate, and low in cost.

[0070] Buffer grooves 25 are respectively connected to the bottom of the material guide channel 24 and the bottom of the receiving groove 18. The width of the buffer groove 25 is adapted to the diameter of the workpiece. The bottom of the buffer groove 25 connected to the material guide channel 24 covers the bottom of the material guide channel 24 to catch the falling workpiece.

[0071] The buffer trough 25 is an inclined trough, and the top of the buffer trough 25 is used to connect with the upstream material guide channel 24 or the receiving trough 18.

[0072] A guide member 26 is provided at the center of the bottom opening of the buffer groove 25. The end of the guide member 26 near the buffer groove 25 is tapered. The width of the guide member 26 is adapted to the width of the slot of the workpiece. The height of the guide member 26 is adapted to the slot of the workpiece located on the buffer groove 25. The guide member 26 can be inserted into the slot of the workpiece located on the buffer groove 25.

[0073] A friction wheel 27 is rotatably mounted on one side of the buffer groove 25. The circumferential surface of the friction wheel 27 protrudes from the inner wall of the buffer groove 25. The circumferential surface of the friction wheel 27 can contact the circumferential surface of the workpiece. The friction wheel 27 is made of rubber or silicone. After contacting the workpiece, it can drive the workpiece to rotate based on friction. A stepper motor is installed at the bottom of the buffer groove 25 to drive the friction wheel 27 to rotate, so that the friction wheel 27 keeps rotating.

[0074] When the circumferential surface of the workpiece located in the buffer groove 25 contacts one end of the guide member 26, the friction wheel 27 is located in the middle of the workpiece and contacts the circumferential surface of the workpiece. The rotation of the friction wheel 27 causes the workpiece to rotate. When the slot of the workpiece aligns with the tip of the guide member 26, the workpiece naturally slides downwards due to the inclination of the buffer groove 25, gradually allowing the guide groove to insert into the slot of the workpiece, thus achieving positioning of the slot and maintaining the circumferential positioning of the workpiece.

[0075] The guide member 26 is symmetrically provided with belt mechanisms 28 on both sides. The belt mechanism 28 includes a machine plate, a belt motor 29 is installed at one end of the machine plate, and belt pulleys 29 with upright axial direction are installed at both ends of the machine plate. A loop belt 29 is wound between the two belt pulleys 29 on the same side. One of the belt pulleys 29 is driven by the belt motor 29. The belts 29 in the inner layer of the belt mechanism 28 are arranged side by side with the spacing adapted to the width of the workpiece. A row of upright support wheels is installed between the two belt pulleys 29. The support wheels are used to support the inner belt 29 and maintain auxiliary clamping of the workpiece.

[0076] The guide member 26 is provided with a grinding wheel 30 that rotates under motor control at one end away from the buffer groove 25. There can be one or more grinding wheels 30. The belt mechanisms 28 on both sides of the grinding wheel 30 are centrally located. The top of the grinding wheel 30 is provided with a wheel frame for mounting the grinding wheel 30. The guide member 26 can be fixed on the wheel frame by a long rod. The outer edge cross section of the grinding wheel 30 is consistent with the design shape of the slot of the workpiece. The slot is ground by the grinding wheel 30 to achieve the effect of fine grinding.

[0077] The bottom end of the buffer groove 25 is provided with a slide 31 connected thereto. The slide 31 extends horizontally, and the top surface of the slide 31 is coplanar with the bottom of the buffer groove 25. The slide 31 is used for auxiliary support to prevent slight displacement caused by downward force during grinding. At the bottom end of the slide 31, a device or equipment for conveying materials to subsequent processes can be connected, such as a chute, trough, or conveyor belt with a similar structure.

[0078] Based on the upstream screening and material distribution, the workpieces entering the buffer tank 25 all have their slots facing up. When the workpiece comes into contact with the tapered tip of the guide 26, if the slot of the workpiece is not aligned with the guide 26, it is stopped at that position and rotated by the friction wheel 27 on one side until the slot of the workpiece aligns with the guide 26. Then, it slides down and the slot of the workpiece is inserted into the guide 26. Through the positioning of the guide 26, the workpiece can maintain the slot in the center. In this state, it is clamped by the belts 29 on both sides and transported backward in parallel. Based on the rotation clamping of the belts 29, the workpiece is driven to accurately fit with the positioning and installed grinding wheel 30, realizing the positioning and fine grinding of the slot.

[0079] In summary, this newly designed grinding equipment can achieve ultra-high precision grinding of end faces and slots based on fully automated production line operations. Furthermore, it can identify and divert end faces during transfer and conveying. The entire process does not require the cooperation of high-cost equipment such as robotic arms and vision recognition. Through indirect structure and simplified actions, it achieves efficient and high-precision grinding processes.

Claims

1. An ultra-precision grinding device for producing soft magnetic ferrite cores, comprising partially intersecting grinding discs and a turntable, wherein the grinding discs include an upper grinding disc and a lower grinding disc that are cocircular and correspond to each other vertically, and the turntable includes upper and lower double-layered discs that rotate synchronously on the same axis, wherein the discs have multiple workstation holes, and the intersection area of ​​the turntable and the grinding discs can simultaneously cover at least one workstation hole; an annular tray not smaller than the turntable is provided below the turntable, the upper end face of the annular tray is adapted to the upper end face of the lower grinding disc, and the edge of the tray has an arc-shaped notch adapted to the intersection area of ​​the grinding discs, characterized in that... The work station includes an inner hole and an outer hole that are connected. The line connecting the centers of the inner and outer holes corresponds to the diameter of the turntable. The inner diameter of the inner hole corresponds to the outer diameter of the magnetic core workpiece, and the inner diameter of the outer hole is larger than the inner diameter of the inner hole. A stop arc-shaped positioning piece is provided between the two discs. The positioning piece is located in the intersection area of ​​the grinding disc and the turntable. The end face of the positioning piece near the axis of the turntable is an arc-shaped positioning surface coaxial with the turntable. The minimum distance between the inner hole and the axis of the turntable is d. The difference between the radius of the positioning surface and d corresponds to the diameter of the magnetic core workpiece. Guide pieces are provided at both ends of the positioning piece, bending away from the center of the turntable. The end of the guide piece away from the positioning piece is located at the edge of the turntable. A material feeding notch is provided on the tray away from the grinding disc. A material receiving groove is provided below the material feeding notch. The width of the groove is adapted to the diameter of the workpiece. The receiving groove is an inclined groove with the end near the tray as the top. The middle or lower part of the bottom of the receiving groove is provided with a rectangular notch corresponding to its width. A strip frame adapted to the width of the slot on the end face of the workpiece is fixed in the center of the rectangular notch. A friction plate is provided on one side of the rectangular notch. The end of the friction plate near the bottom of the receiving groove is provided with a distributing port that penetrates the groove wall. When the strip frame is inserted into the slot on the end face of the workpiece, the top surface of the workpiece is lower than the top side of the distributing port. The strip frame includes two parallel guide rods. The maximum distance between the two guide rods is adapted to the width of the slot on the workpiece. The guide rod near the friction plate is lower than the other guide rod. The bottom of the receiving groove is an inclined surface that slopes downward toward the friction plate. The friction plate and the groove wall are both perpendicular to the bottom of the receiving groove.

2. The ultra-precision grinding equipment for producing soft magnetic ferrite cores according to claim 1, characterized in that, A vertically extending feed cylinder is provided above the turntable. The bottom end of the feed cylinder is provided with a circular feed port. The diameter of the feed port is not greater than the inner diameter of the outer hole, but greater than the inner diameter of the inner hole. The center distance between the feed port and the turntable is the same as the center distance between the outer hole and the turntable. The distance between the feed port and the upper surface of the turntable is less than 1 / 2 the height of the workpiece, and the distance between the feed port and the upper surface of the tray is greater than the height of one workpiece.

3. The ultra-precision grinding equipment for producing soft magnetic ferrite cores according to claim 1, characterized in that, It also includes a machine tool host, on which a fixed base is fixed. The turntable is rotatably mounted relative to the fixed base. The fixed base has a circular mounting hole in the center. An annular seat extending vertically upward is fixed in the mounting hole. The fixed base and the annular seat are respectively provided with clearance structures corresponding to the space occupied by the grinding disc. The positioning plate is symmetrically arranged relative to the center line connecting the grinding disc and the turntable. The top side of the positioning plate is close to the upper disc, and the bottom side of the positioning plate is close to the lower disc. A support frame is provided on the outer side of the positioning plate and / or the guide plate. The bottom end of the support frame is fixed to the fixed base.

4. The ultra-precision grinding equipment for producing soft magnetic ferrite cores according to claim 1, characterized in that, The bottom end of the receiving groove is connected to a buffer groove that extends inclined in the same direction. A friction wheel driven by a motor is rotatably mounted on one side of the buffer groove. A guide member passes through the center of the bottom opening of the buffer groove. The width of the guide member is adapted to the width of the workpiece slot. The end of the guide member near the buffer groove is tapered. When the circumferential surface of the workpiece contacts the tapered tip of the guide member, the circumferential surface of the workpiece simultaneously contacts the friction wheel. The end of the guide member away from the buffer groove is equipped with a grinding wheel that rotates under motor control. The outer cross-section of the grinding wheel is consistent with the design shape of the workpiece slot.

5. The ultra-precision grinding equipment for producing soft magnetic ferrite cores according to claim 4, characterized in that, The outer side of the material distribution port is provided with a material distribution groove fixed to the receiving groove. The bottom of the material distribution groove near the receiving groove extends into the lower part of the material distribution port. The width of the material distribution groove corresponds to the diameter of the workpiece. The end of the material distribution groove near the receiving groove is the top. The material distribution groove slopes downward away from the receiving groove. The end of the material distribution groove away from the receiving groove is connected to a guide channel integrally formed therewith. The guide channel is a closed structure. The inner cavity of the guide channel is adapted to the shape of the workpiece. The guide channel is an arc-shaped channel with a 90-degree arc bend. The bottom end of the guide channel is a vertical channel extending downward. The bottom end of the guide channel is also connected to a buffer groove.

6. The ultra-precision grinding equipment for producing soft magnetic ferrite cores according to claim 4, characterized in that, The guide and the grinding wheel are symmetrically provided with belt mechanisms on both sides. The belt mechanism includes a machine plate, and the two ends of the machine plate are respectively equipped with pulleys with an axial direction that are upright. A loop belt is wound between the two pulleys on the same side, and the minimum distance between the belts on both sides corresponds to the diameter of the workpiece.

7. The ultra-precision grinding equipment for producing soft magnetic ferrite cores according to claim 4, characterized in that, The bottom end of the buffer groove is provided with a slide connected thereto. The slide extends horizontally, and the top surface of the slide is coplanar with the bottom of the buffer groove.

8. The ultra-precision grinding equipment for producing soft magnetic ferrite cores according to claim 2, characterized in that, The top of the feeding cylinder is connected to a fixed feeding trough, which is an inclined chute, and the bottom of the feeding trough is connected to the feeding cylinder.

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