Superfinishing grinding equipment for soft magnetic ferrite core production

Abstract

The invention discloses superfinishing grinding equipment for soft magnetic ferrite core production, and mainly relates to the technical field of superfinishing grinding. Comprising a grinding disc and a rotating disc which are partially intersected, a plurality of station holes penetrate through the rotating disc, an annular tray is arranged below the rotating disc, each station hole comprises an inner hole site and an outer hole site which are communicated, the inner hole site is small, the outer hole site is large, the rotating disc comprises an upper disc piece and a lower disc piece which coaxially and synchronously rotate, and a locking arc-shaped positioning piece is arranged between the two disc pieces. The end face of the side, close to the axis of the rotary disc, of the positioning piece is an arc-shaped positioning curved surface coaxial with the rotary disc, the minimum distance between the inner hole position and the axis of the rotary disc is d, and the difference value of the radius of the positioning curved surface and d corresponds to the diameter of a magnetic core workpiece. The two ends of the positioning piece are provided with guide pieces bent in the direction away from the circle center of the rotary disc. The double-end-face machining device has the beneficial effects that continuous and efficient operation in double-end-face machining is achieved, automatic feeding and discharging are supported, and the machining precision is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-precision grinding, and particularly to an ultra-precision grinding device for the production of soft magnetic ferrite cores. Background Art

[0002] A soft magnetic ferrite core is a core made of a ferrite material with soft magnetic properties. The characteristics of soft magnetic materials are high magnetic permeability, low coercive force, and the ability to be magnetized and demagnetized quickly when the magnetic field changes. Soft magnetic ferrite cores are widely used in electronic components such as transformers and inductors for efficiently storing and transferring magnetic energy. Manganese-zinc soft magnetic ferrite cores are a specific type of soft magnetic ferrite cores. The composition is mainly oxides of manganese, zinc, and iron, and has a spinel structure. This structure enables it to exhibit high magnetic permeability and low losses in the low-frequency and medium-frequency ranges (such as dozens of kilohertz to hundreds of kilohertz). In specific applications, based on different application scenarios, manganese-zinc soft magnetic ferrite cores are commonly found in cylindrical or ring shapes. Its processing mainly includes forming, demolding, and firing, and also requires fine grinding on its surface. The purpose of fine grinding is, on the one hand, to ensure that the outer diameter, inner diameter, and thickness of the core meet the design requirements, and the performance and dimensions of cores in the same batch should be highly consistent to ensure the stability and reliability of the equipment. On the other hand, the surface should be smooth and crack-free to reduce eddy current losses and improve magnetic properties. If the surface treatment is improper or the accuracy is not high, it will directly affect the magnetic properties and the performance of the equipment will decline.

[0003] In the existing fine grinding process, the main problems still focus on the accuracy of the process. The equipment used includes various grinding machines. Although the numerical control and automation levels are relatively advanced, it is still difficult to improve in terms of flatness, perpendicularity, and roughness. This is mainly reflected in the following aspects:

[0004] First of all, in the fine grinding of ring-shaped parts, the perpendicularity of the end face has always been a difficult problem in this process. Currently, for the end face processing of small parts, in the commonly used double-end face grinding equipment, whether it is a vertical double-end face grinding machine or a horizontal double-end face grinding machine, it is difficult to ensure the perpendicularity of the outer circle relative to the two end faces. Therefore, many manufacturers cannot use double-sided grinding equipment at present. They can only process one end face first and then use this as a reference to process the other end face. However, even in this way, the processing accuracy still cannot satisfy people. This is mainly because: Firstly, if the perpendicularity of the first end face is not good during processing, the error of the second end face will be magnified exponentially during the grinding process. Secondly, during the turnover process between different processes, there will also be bumps, scratches, etc., and the probability of errors accumulates with more transfer links, all of which will drag down the final accuracy. In addition, this processing method not only needs to increase the process links, but also requires re-turning and material handling in the middle, resulting in complicated working hours and processes, increasing costs and working hours.

[0005] Secondly, the magnetic core workpieces are often small in size and large in quantity. On the one hand, processing efficiency is the key point in production accounting. With a large product output, the rigid demand for efficiency and the demand for precision both pose high requirements for cost allocation. If the precision of ordinary equipment can meet the requirements, the efficiency is low. When the efficiency is stable, the precision is greatly reduced. If both are taken into account, it will be stretched thin, and the capital investment is not small, which makes the processing manufacturers very headache. On the other hand, the small size of the workpieces brings difficulties in material handling, consuming more in aspects such as sorting, feeding, and alignment. For example, in the process of transferring and sorting workpieces, the existing technologies mostly rely on high-precision mechanical grippers. The equipment is complex and often requires the cooperation of monitoring and data feedback such as visual recognition. It is not only difficult to grip, but also has a high recognition difficulty, resulting in frequent pauses and error reports in the production process, and has high requirements for technicians, as well as high costs for equipment maintenance and configuration.

[0006] In summary, all the above factors lead to the unsatisfactory processing precision in the grinding process, complex processing procedures, and it is difficult to balance cost, efficiency, and precision. Summary of the Invention

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

[0008] To achieve the above object, the present invention is realized through the following technical solutions:

[0009] An ultra-precision grinding equipment for the production of soft magnetic ferrite cores includes a grinding disc and a turntable that partially intersect. The grinding disc includes an upper grinding disc and a lower grinding disc that are co-circular and correspond up and down. A plurality of station holes penetrate through the disc, and at least one station hole can be simultaneously covered in the intersection area of the turntable and the grinding disc. An annular tray not smaller than the turntable is provided below the turntable. The upper end surface of the annular tray is adapted to the upper end surface of the lower grinding disc, and an arc-shaped notch adapted to the intersection area of the grinding disc is provided at the edge of the annular tray.

[0010] The station hole includes a connected inner hole position and outer hole position. The center line connecting the inner hole position and the outer hole position corresponds to the radial line of the turntable. The inner diameter of the inner hole position corresponds to the outer diameter of the magnetic core workpiece. The inner diameter of the outer hole position is larger than that of the inner hole position. The turntable includes upper and lower double-layer discs that rotate synchronously coaxially. A stationary 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 on the side of the positioning piece close to the axis of the turntable is a circular arc-shaped positioning surface coaxial with the turntable. The minimum distance between the inner hole position 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 that bend away from the center of the turntable are provided at both ends of the positioning piece, and the ends of the guide pieces away from the positioning piece are located at the edge of the turntable.

[0011] A vertically extending discharge barrel is provided above the turntable, and a circular discharge port is provided at the bottom end of the discharge barrel. The diameter of the discharge port is not larger than the inner diameter of the outer hole, and larger than the inner diameter of the inner hole. The center distance between the discharge port and the turntable is consistent with the center distance between the outer hole and the turntable. The distance between the discharge port and the upper end face of the turntable is less than 1 / 2 the height of the workpiece, and the distance from the discharge port to the upper end face of the tray is greater than the height of a workpiece.

[0012] The strip frame includes two polished rods arranged in parallel, the maximum distance between the two polished rods is adapted to the width of the workpiece's slot, the polished rod close to the friction plate is lower than the other polished rod, the bottom of the material receiving trough is an inclined surface inclined downward toward the friction plate, and the friction plate and the trough wall of the material receiving trough are both arranged perpendicular to the bottom of the material receiving trough.

[0013] It also includes a machine tool mainframe, on which a fixing seat is fixed, and the turntable is rotatably installed relative to the fixing seat. A circular mounting hole is provided in the center of the fixing seat, and an annular seat extending vertically upward is fixed on the mounting hole. The fixing seat and the annular seat are respectively provided with a giving structure corresponding to the position of the grinding disc, and 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, and a support frame is provided on the outer side of the positioning plate and / or the guide plate, and the bottom end of the support frame is fixed on the fixing seat.

[0014] A material discharge notch is provided at the place where the tray is far from the grinding disc, a material receiving groove is provided below the material discharge notch, the width of the material receiving groove is adapted to the diameter of the workpiece, the material receiving groove is an inclined groove and the end close to the tray is the top end, a rectangular notch corresponding to its width is provided in the middle or lower part of the bottom of the material receiving groove, a strip frame adapted to the width of the straight groove of 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, and a material dividing opening that penetrates the groove wall of the material receiving groove is provided at one end of the friction plate close to the bottom end of the material receiving groove, and when the strip frame is inserted into the straight groove of the end face of the workpiece, the top face of the workpiece is lower than the top side of the material dividing opening;

[0015] The bottom end of the material receiving trough is butt-jointed with a buffer trough extending obliquely in the same direction as the material receiving trough, a friction wheel driven by a motor is rotatably installed on one side of the buffer trough, a guide member is centered through the bottom notch of the buffer trough, the width of the guide member is adapted to the width of the slot of the workpiece, the end of the guide member close to the buffer trough is conical, when the circumferential surface of the workpiece contacts the conical tip of the guide member, the circumferential surface of the workpiece contacts the friction wheel at the same time, the end of the guide member away from the buffer trough is provided with a grinding wheel that rotates under motor control, the outer edge cross-section of the grinding wheel is consistent with the design shape of the slot of the workpiece.

[0016] Outside the material distribution opening, there is a material distribution groove fixed to the material receiving groove. The bottom of the material distribution groove near the material receiving groove extends below the material distribution opening. The width of the material distribution groove corresponds to the diameter of the workpiece. The end of the material distribution groove near the material receiving groove is the top end. The material distribution groove slopes downward in the direction away from the material receiving groove. The end of the material distribution groove away from the material receiving groove is connected to a guiding channel integrally formed therewith. The guiding channel is a closed structure. The inner cavity of the guiding channel is adapted to the outer shape of the workpiece. The guiding channel is an arc-shaped channel with a 90-degree arc bend. The bottom end of the guiding channel is a vertical channel extending vertically downward. The bottom end of the guiding channel is also connected to a buffer groove.

[0017] On both sides of the guiding member and the grinding wheel, there are symmetrically arranged belt mechanisms. The belt mechanism includes a machine plate. At both ends of the machine plate, pulleys with an upright axis are respectively installed. A loop-shaped belt is wound between the two pulleys on the same side. The minimum distance between the two belts on both sides corresponds to the diameter of the workpiece.

[0018] At the bottom end of the buffer groove, there is a sliding frame connected thereto. The sliding frame extends horizontally, and the top surface of the sliding frame is coplanar with the bottom of the buffer groove.

[0019] At the top end of the blanking cylinder, there is a feeding groove fixed thereto. The feeding groove is an inclined chute. The bottom end of the feeding groove is connected to the blanking cylinder.

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

[0021] Through the station holes with a special large and small hole structure, combined with the positioning assistance of the positioning piece in the grinding area, the improvement of both precision and efficiency is achieved. On the one hand, the larger outer hole positions can smoothly accommodate the workpieces to fall, thus facilitating the loading and unloading under the action of natural gravity, providing a prerequisite for automatic loading and unloading. On the other hand, the inner hole positions adapted to the height of the workpiece improve the precision, and through the clamping of the workpiece on the relative two sides by the inner hole positions and the positioning curved surfaces, it is ensured that the workpiece is in a vertical state, solving the problem of perpendicularity in end face machining. Thus, through simple operations, the configuration cost of high-precision grinding is reduced, and the process precision is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the present invention (the main machine other than the grinding disc and the turntable part is omitted).

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

[0024] Figure 3 is the present invention Figure 2 is a sectional view taken along AA.

[0025] Figure 4is the present invention Figure 1 Schematic diagram of component disassembly.

[0026] Figure 5 is the present invention Figure 1 Bottom schematic diagram.

[0027] Figure 6 Schematic diagram of the structure of Embodiment 1 of the present invention.

[0028] Figure 7 Internal structure schematic diagram of Embodiment 1 of the present invention (removing the grinding disc and the rotating disc).

[0029] Figure 8 Cross-sectional schematic diagram of the present invention at the material guiding channel.

[0030] Figure 9 Schematic diagram of the buffer tank and its downstream structure of the present invention.

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

[0032] Reference numerals shown in the drawings:

[0033] 1. Upper grinding disc; 2. Lower grinding disc; 3. Rotating disc; 4. Rotating shaft; 5. Station hole; 6. Inner hole position; 7. Outer hole position; 8. Fixed seat; 9. Ring seat; 10. Tray; 11. Arc notch; 12. Feeding notch; 13. Positioning piece; 14. Guide piece; 15. Support frame; 16. Feeding cylinder; 17. Feeding groove; 18. Receiving groove; 19. Rectangular notch; 20. Striped frame; 21. Friction plate; 22. Material dividing opening; 23. Material dividing groove; 24. Material guiding channel; 25. Buffer tank; 26. Guide member; 27. Friction wheel; 28. Belt mechanism; 29. Belt; 30. Grinding wheel; 31. Slide carriage. Detailed implementation manners

[0034] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by this application.

[0035] For the instruments, reagents, materials, etc. involved in the following embodiments, unless otherwise specified, they are all conventional instruments, reagents, materials, etc. existing in the prior art and can be obtained through regular commercial channels. For the experimental methods, detection methods, etc. involved in the following embodiments, unless otherwise specified, they are all conventional experimental methods, detection methods, etc. existing in the prior art.

[0036] Embodiment:

[0037] As a grinding process for workpieces, it essentially includes peripheral grinding and end face 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 the improvement of the ultra-precision machining of the end face.

[0038] For the end face machining of the annular magnetic core, the first thing to ensure is the perpendicularity between the end face and the peripheral surface, and the second is the smoothness of the end face. Based on the continuous improvement of existing grinding equipment, there is no problem with the smoothness of the end face (verified by roughness data). For a long time, the main problem that has been difficult to overcome is the axial perpendicularity of the end face. Especially when there is a single groove on the end face (for the needs of winding installation or positioning, etc., commonly found on one end face of the annular magnetic core), it is also necessary to grind inside the single groove. Therefore, this equipment mainly includes two processes, namely the end face grinding process and the positioning grinding process. This equipment corresponds to the two processes, and the main structure mainly includes an end face grinding mechanism and a positioning grinding mechanism.

[0039] I. End face grinding mechanism

[0040] It is mainly used to perform the end face grinding process and solve the accuracy and efficiency problems in the end face machining of the annular magnetic core.

[0041] In double-sided grinding equipment, whether it is vertical or horizontal, it is necessary to load the workpiece at the workstation (some are hole workstations, some are groove workstations), that is, load the workpiece. After the workpiece is in place, the back disk drives it into the grinding disks for end face grinding. In order to load the workpiece, there must be a certain gap between the current workstation and the workpiece to ensure smooth loading and unloading, so it is inevitable that the perpendicularity in double-sided grinding is discounted. And in order not to overly lose the accuracy of end face grinding, the current double-end face grinders are all manually loaded. Even for grinders imported from Japan, it is very difficult to achieve automatic loading and unloading and continuous production of double-end face grinding.

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

[0043] The structure of the machine tool main body is the same as that of the existing technology. The installed grinding disk is a grinding wheel 30 grinding disk, which respectively includes an upper grinding disk 1 and a lower grinding disk 2 driven by a motor to rotate. The bottom surface of the upper grinding disk 1 is the upper working surface, and the top surface of the lower grinding disk 2 is the lower working surface. The working surfaces of the upper grinding disk 1 and the lower grinding disk 2 are opposite and horizontally arranged for grinding through the workpiece.

[0044] The turntable 3 is rotatably installed on one side of the grinding disk. A plurality of station holes 5 penetrate through the turntable 3. The station holes 5 are circumferentially arranged relative to the turntable 3, and the turntable 3 is arranged between the upper grinding disk 1 and the lower grinding disk 2. The turntable 3 partially intersects with the grinding disk and has an intersection area, and this intersection area can accommodate at least two station holes 5 at the same time.

[0045] The turntable 3 includes two discs arranged in a circle up and down, and the discs are penetrated with corresponding workstation holes 5. A rotating shaft 4 is fixed through the middle of the two discs, and the rotating shaft 4 drives the two discs to rotate or stop synchronously. A flange is also provided in the center of the two discs, and the two discs are reinforced by long bolts penetrating the upper and lower flanges to ensure that the workstation holes 5 of the two discs correspond with high precision. An annular groove structure is formed between the two discs along their edges. Based on the above installation method, the annular groove structure covers all the workstation holes 5.

[0046] A fixing seat 8 is provided below the turntable 3 and is fixedly installed relative to the main machine of the machine tool. The turntable 3 is rotatably installed relative to the fixing seat 8. A motor is installed below the fixing seat 8. The output shaft of the motor is connected to the bottom end of the rotating shaft 4 to realize the driving rotation of the turntable 3. A circular mounting hole is provided in the center of the fixing seat 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 fixing seat 8 and the annular seat 9 are respectively provided with a giving way structure corresponding to the position of the grinding disc, so that the fixing seat 8 and the annular seat 9 do not contact the grinding disc, thereby facilitating the operation of the grinding disc.

[0047] A ring-shaped tray 10 is fixed to the top of the ring-shaped seat 9, and the top surface of the ring-shaped tray 10 is a horizontal and smooth supporting surface. The supporting surface is arranged close to the bottom surface of the lower disk and is used to support the bottom end surface of the workpiece. The outer circle of the ring-shaped tray 10 corresponds to the turntable 3, and the inner diameter of the inner circle of the tray 10 is smaller than the minimum distance from the workstation hole 5 to the center of the turntable 3, so that the supporting surface can cover all the workstation holes 5.

[0048] The tray 10 is provided with an arc-shaped notch 11 corresponding to the shape of the grinding disc adjacent to the grinding disc, which is used 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 is convenient for connecting and supporting the workpiece.

[0049] A material discharge notch 12 is provided on a side of the tray 10 away from the grinding disc, and the material discharge notch 12 is used to drop the magnetic core workpiece located in the work station hole 5 .

[0050] The work station hole 5 includes an inner hole position 6 and an outer hole position 7 which are connected to each other. The line connecting the centers of the inner hole position 6 and the outer hole position 7 corresponds to the radial line 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, so it is also significantly larger than the size of the workpiece, which facilitates the workpiece to fall smoothly into the outer hole position 7.

[0051] The outer hole is an area convenient for loading. Based on the fact that it is significantly larger than the workpiece size, the workpiece can fall in smoothly, enabling both manual loading and providing a prerequisite for realizing automatic loading. Since the station hole 5 of the existing double-end surface grinding machine cannot be overly loose after being matched with the workpiece, it brings difficulties for the workpiece to be in place. Using automatic loading can only rely on the manipulator to insert downward, and the manipulator is expensive, greatly increasing the cost of the entire set of equipment. Therefore, only manual loading is used in the existing equipment. However, by setting the large and small holes, the outer hole position 7 is set to have a significantly larger size to accommodate the workpiece, which can solve the loading problem in automatic production.

[0052] An arc-shaped positioning piece 13 is provided in the annular groove structure. One end face of the positioning piece 13 close to 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 layer disc, and the bottom side of the positioning piece 13 is close to the lower layer disc. The positioning piece 13 is also located inside the grinding disc. Therefore, the positioning piece 13 is located in the intersection area of the grinding disc and the turntable 3, and it is preferably symmetrically arranged relative to the center line connecting 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, the radius of the positioning curved surface is R, and 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 contacts the positioning curved surface, the workpiece is squeezed and pressed against the inner hole position 6 through the positioning curved surface. Based on the high adaptability between the inner hole position 6 and the outer diameter of the workpiece, the workpiece is held vertically by the clamping of the positioning curved surface and the inner hole position 6 on both sides. In this state, the machining of the upper and lower end faces can improve the guarantee of perpendicularity.

[0053] Both ends of the positioning piece 13 are provided with guiding pieces 14 bent away from the center of the turntable 3. One end of the guiding piece 14 away from the positioning piece 13 is located at the edge of the turntable 3. As the turntable 3 rotates, the workpiece in the station hole 5 is guided by the guiding piece 14 and gradually approaches the inner hole position 6, and finally is clamped by the positioning piece 13 and the inner hole position 6.

[0054] Through the station hole 5 with a specially designed large and small hole structure, combined with the positioning assistance of the positioning piece 13 in the grinding area, it is not only convenient for the loading and unloading of the workpiece (outer hole position 7), but also can further improve the adaptability between the inner hole position 6 and the workpiece, without worrying about the situation of the workpiece getting stuck. By clamping the workpiece on the relative two sides of the workpiece by the inner hole position 6 and the positioning curved surface, it is ensured that the workpiece is in a vertical state, solving the problem of perpendicularity in end face machining.

[0055] The positioning piece 13 and the guiding piece 14 are integrally formed sheet metals. A support frame 15 is provided on the outer sides of the positioning piece 13 and the guiding piece 14. The bottom end of the support frame 15 is fixed on the fixed seat 8 to realize the installation and fixation of the positioning piece 13 and the guiding piece 14.

[0056] A vertically extending discharge barrel 16 is provided above the turntable 3, and a circular discharge port is provided at the bottom end of the discharge barrel 16. The distance between the discharge port and the top surface of the turntable 3 is less than 1 / 2 of the height of the workpiece, and the distance between the discharge port and the support surface is greater than the height of one workpiece. The diameter of the discharge port 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 discharge port and the turntable 3 is consistent with the center distance between the outer hole 7 and the turntable 3, so that when the turntable 3 rotates to make the station hole 5 located below the discharge barrel 16, the workpiece naturally falls into the outer hole 7 based on gravity and moves with the turntable 3.

[0057] The top of the lower barrel 16 is connected to a feed trough 17 fixed thereto, and the bottom of the feed trough 17 is connected to the lower barrel 16. The feed trough 17 is an inclined chute, and the workpiece moves from the feed trough 17 to the lower barrel 16 based on gravity. The width of the feed 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 sliding of the workpiece and avoid the workpieces from being piled up side by side.

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

[0059] Based on the above structure, a breakthrough in the automation of loading and unloading of double-end grinding process has been achieved. Without using a robot, the simplest and low-cost chute structure can be used to achieve automatic loading. This greatly reduces the configuration cost and maintenance difficulty, and saves labor.

[0060] 2. Positioning grinding mechanism

[0061] It is used to position and grind the I-shaped transverse groove on the end face. After the workpiece is demoulded and ejected from the cavity, the position of the I-shaped groove is relatively chaotic during the transportation of a large number of fallen workpieces. If you want to grind the I-shaped groove, the main difficulty lies in how to accurately position the I-shaped groove. Therefore, this link is now manually picked out and aligned, and multiple stations are distributed on the assembly line. Not only is it time-consuming, but it is also easy to make mistakes and cause the entire line to stop.

[0062] The mechanism includes a receiving trough 18, the width of which is adapted to the diameter of the workpiece, and the receiving trough 18 is an inclined trough with a U-shaped cross section, the top of which is located below the material discharge notch 12, and the receiving trough 18 extends downwardly in a direction away from the grinding disc to form a chute structure. When the workpiece moves to the material discharge notch 12 with the turntable 3, it naturally falls into the receiving trough 18 below, and gradually slides downward to feed the material as the receiving trough 18 tilts slightly.

[0063] A rectangular notch 19 corresponding to the width of the material receiving trough 18 is provided near the lower end thereof, and a strip frame 20 corresponding to the width of the slot on the end face of the workpiece is fixed in the center of 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 to the workpiece when in contact with the peripheral surface of the workpiece, so as to make it rotate. A material distribution opening 22 is provided at one end of the friction plate 21 close to the bottom end of the material receiving trough 18, and the width of the material distribution opening 22 is adapted to the width of the workpiece. The material distribution opening 22 penetrates the wall of the material receiving trough 18, and the distance from the top side of the material distribution opening 22 to the strip frame 20 is less than the height of the workpiece, and is slightly greater than the difference between the height of the workpiece and the depth of the slot, so that when the strip frame 20 is inserted into the slot on the bottom face of the workpiece, the top face of the workpiece is lower than the top side of the material distribution opening 22. The workpiece can be discharged from the material distribution opening 22. The total length of the material distribution opening 22 and the friction plate 21 is adapted to the strip frame 20 , and the workpiece on the strip frame 20 first passes through the friction plate 21 and then passes through the material distribution opening 22 .

[0064] The strip frame 20 can be a long bar or a plurality of parallel straight bars, and its width can be slightly smaller than the width of the groove on the end face of the workpiece. In this example, two polished rods are arranged in parallel to form the strip frame 20, and the maximum distance between the two polished rods is adapted to the width of the slot of the workpiece, and the polished rod close to the friction plate 21 is slightly lower than the other polished rod, so that the workpiece falling on the two polished rods always remains inclined to the side of the friction plate 21 and is smoothly separated from the material separation port 22.

[0065] The bottom of the receiving trough 18 is preferably a slope that is inclined downward near the friction plate 21, so that the workpiece on the receiving trough 18 is kept against the trough wall of the receiving trough 18 on the side where the friction plate 21 is provided, and the friction plate 21 and the trough wall of the receiving trough 18 are preferably perpendicular to the bottom of the receiving trough 18, which is more conducive to the contact of the peripheral surface of the workpiece. And when the workpiece slides on the strip frame 20, it can still help maintain the inclination toward the friction plate 21, and can naturally fall out when it encounters the material distribution port 22.

[0066] Based on the above structure, after the workpiece falls into the material receiving groove 18, as the workpiece slides towards the bottom end of the material receiving groove 18, the workpiece leans against one side wall of the groove with the friction plate 21. Subsequently, the workpiece continues to lean against the friction plate 21, lands on the strip-shaped frame 20 and slides downward. During the sliding process, it rotates circumferentially through contact with the friction plate 21. When the keyway of the workpiece is on the top surface, no matter how it rotates, under the restraint of the two side walls of the material receiving groove 18 and the support of the strip-shaped frame 20, the workpiece can smoothly pass through the material receiving groove 18. When the keyway of the workpiece is at the bottom end face of the groove, with the axial rotation and downward sliding of the workpiece, when the keyway on the bottom surface of the workpiece rotates to the same direction as the strip-shaped frame 20, the workpiece will fall, and the strip-shaped frame 20 will insert into the keyway of the workpiece and slide while maintaining this state under the guidance of the strip-shaped frame 20 and the material receiving groove 18. When passing through the material distribution port 22, it will fall out from the material distribution port 22.

[0067] A material distribution groove 23 fixed to the material receiving groove 18 is provided outside the material distribution port 22. The bottom of the material distribution groove 23 near one end of the material receiving groove 18 extends deep below the material distribution port 22. The groove width of the material distribution groove 23 corresponds to the diameter of the workpiece. One end of the material distribution groove 23 near the material receiving groove 18 is the top end. The material distribution groove 23 slopes downward along the direction away from the material receiving groove 18 to convey the workpiece falling on the material distribution groove 23 in the direction away from the material receiving groove 18.

[0068] One end of the material distribution groove 23 away from the material receiving groove 18 is communicated with a guide channel 24 integrally formed therewith. The guide channel 24 is a closed structure. The inner cavity of the guide channel 24 is adapted to the circumferential outer shape of the workpiece. The guide channel 24 is an arc-shaped channel with a 90-degree arc bend. Its top end is communicated with the bottom end of the material distribution groove 23, and its bottom end is a vertical channel extending vertically downward. When the workpiece falls into the material distribution groove 23 from the material distribution port 22 (such as Figures 6 - 8 the state shown), it slides down along the material distribution groove 23 to the guide channel 24 and is turned over to the state with the keyway on the top during the sliding along the guide channel 24. Preferably, the bottom side of the guide channel 24 adopts a flat sliding surface (easy to dock with the material distribution groove 23), and the top side of the guide channel 24 adopts a curved constraint surface (better adaptability to the workpiece). In this way, the design of the guide channel 24 is more reasonable. It is not limited to this example, and other channels with a square cross-section can also be used as long as the side length of the square channel is adapted to the diameter of the workpiece.

[0069] Based on the above structure, the identification of the workpiece with the keyway on the bottom surface is completed when passing through the rectangular notch 19, the separation of the workpiece with the keyway on the bottom surface is completed through the material distribution port 22, and it is turned over to the state with the keyway on the top during the process of being turned upright through the guide channel 24. The complex sorting and turning over in the prior art are completed through a simple chute feeding process, replacing manual labor, and without the need for visual recognition and robot cooperation, with high efficiency, simple operation and low cost.

[0070] Buffer grooves 25 are respectively butted at the bottom ends of the material guiding channel 24 and the material receiving groove 18. The groove width of the buffer groove 25 is adapted to the diameter of the workpiece. The groove bottom of the buffer groove 25 butted with the material guiding channel 24 covers the lower part of the material guiding channel 24 to pick up the falling workpiece.

[0071] The buffer groove 25 is an inclined groove, and the top end of the buffer groove 25 is used to be butted with the upstream material guiding channel 24 or the material receiving groove 18.

[0072] A guiding member 26 is centrally provided at the bottom slot opening of the buffer groove 25. One end of the guiding member 26 close to the buffer groove 25 is conical. The width of the guiding member 26 is adapted to the groove width of the one-word groove of the workpiece. The height of the guiding member 26 is adapted to the one-word groove of the workpiece located on the buffer groove 25. The guiding member 26 can be inserted into the one-word groove of the workpiece located on the buffer groove 25.

[0073] A friction wheel 27 is rotatably installed on one side of the buffer groove 25. The peripheral surface of the friction wheel 27 protrudes from the inner wall of the buffer groove 25. The peripheral surface of the friction wheel 27 can be in contact with the peripheral surface of the passing workpiece. The friction wheel 27 is made of a rubber wheel or a silica gel wheel and can drive the workpiece to rotate based on the frictional force after contacting the workpiece. A stepping motor for driving the friction wheel 27 to rotate is installed at the bottom of the buffer groove 25 to keep the friction wheel 27 rotating.

[0074] When the peripheral surface of the workpiece located in the buffer groove 25 comes into contact with one end of the guiding member 26, the friction wheel 27 is located at the middle of the workpiece and is in contact with the peripheral surface of the workpiece. By the rotation of the friction wheel 27, the workpiece rotates. When it rotates to the position where the one-word groove of the workpiece corresponds to the tip of the guiding member 26, due to the inclination of the buffer groove 25, the workpiece naturally slides downward, and gradually inserts the guiding groove into the one-word groove of the workpiece to realize the positioning of the one-word groove and maintain the circumferential positioning of the workpiece.

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

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

[0077] The bottom end of the buffer tank 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 tank 25, and the slide 31 is used for auxiliary support to prevent slight deviation caused by downward force during grinding. The bottom end of the slide 31 can be connected to a device or equipment for conveying to the subsequent process, such as a slide trough, a material trough, a conveyor belt, etc. with similar structure.

[0078] Based on the upstream screening and material distribution, the workpieces entering the buffer tank 25 all have the slot on the top. When the workpiece hits the conical tip at the front end of the guide member 26, when the slot of the workpiece is not aligned with the guide member 26, it is stopped at this position and rotated by the friction wheel 27 on one side until the slot of the workpiece corresponds to the position of the guide member 26, and then it slides down and the slot of the workpiece is inserted into the guide member 26. Through the positioning of the guide member 26, the workpiece can maintain the state of the slot being centered, and in this state it is clamped by the belts 29 on both sides and conveyed backward in parallel. Based on the rotating clamping of the belt 29, the workpiece is driven to accurately fit with the positioning and installed grinding wheel 30, so as to achieve the positioning and fine grinding of the slot.

[0079] In summary, the newly designed grinding equipment can complete the grinding of end faces and slots with ultra-high precision under the premise of full-process assembly line automation, and complete the identification and diversion of end faces during transfer and transportation. The entire process does not require the cooperation of high-cost equipment such as robots and visual recognition. Through indirect structure and simplified movements, efficient and high-precision grinding technology can be achieved.

Claims

1. A superfinishing equipment for producing soft ferrite cores, comprising a partially intersecting grinding disc and a turntable, wherein the grinding disc comprises an upper grinding disc and a lower grinding disc which are cocircular and correspond to each other, wherein a plurality of workstation holes are penetrated through the disc, and the intersection area of ​​the turntable and the grinding disc can cover at least one workstation hole at the same time, wherein an annular tray which is not smaller than the turntable is provided below the turntable, wherein the upper end surface of the annular tray is adapted to the upper end surface of the lower grinding disc, and the edge of the annular tray is provided with an arc-shaped notch adapted to the intersection area of ​​the grinding disc, wherein the arc-shaped notch is provided at the edge of the turntable, wherein the arc-shaped notch is provided at the edge of the turntable, and the arc-shaped notch is adapted to the intersection area of ​​the grinding disc, and ... The work station hole includes an inner hole position and an outer hole position which are connected to each other. The line connecting the centers of the inner hole position and the outer hole position corresponds to the diameter line of the turntable. The inner diameter of the inner hole position corresponds to the outer diameter of the magnetic core workpiece. The inner diameter of the outer hole position is larger than the inner diameter of the inner hole position. The turntable includes an upper and lower double-layer disc that rotate coaxially and synchronously. A stop arc-shaped positioning plate is provided between the two discs. The positioning plate is located at the intersection area of ​​the grinding disc and the turntable. The end face of the positioning plate on one side close to the axis of the turntable is an arc-shaped positioning surface coaxial with the turntable. The minimum distance between the inner hole position 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 bent 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.

2. The ultra-fine grinding equipment for producing soft ferrite cores according to claim 1, characterized in that: A vertically extending discharge barrel is provided above the turntable, and a circular discharge port is provided at the bottom end of the discharge barrel. The diameter of the discharge port is not larger than the inner diameter of the outer hole, and larger than the inner diameter of the inner hole. The center distance between the discharge port and the turntable is consistent with the center distance between the outer hole and the turntable. The distance between the discharge port and the upper end face of the turntable is less than 1 / 2 the height of the workpiece, and the distance from the discharge port to the upper end face of the tray is greater than the height of a workpiece.

3. The ultra-fine grinding equipment for producing soft ferrite cores according to claim 1, characterized in that: The strip frame includes two polished rods arranged in parallel, the maximum distance between the two polished rods is adapted to the width of the workpiece's slot, the polished rod close to the friction plate is lower than the other polished rod, the bottom of the material receiving trough is an inclined surface inclined downward toward the friction plate, and the friction plate and the trough wall of the material receiving trough are both arranged perpendicular to the bottom of the material receiving trough.

4. The ultra-fine grinding equipment for producing soft ferrite cores according to claim 1, characterized in that: It also includes a machine tool mainframe, on which a fixing seat is fixed, and the turntable is rotatably installed relative to the fixing seat. A circular mounting hole is provided in the center of the fixing seat, and an annular seat extending vertically upward is fixed on the mounting hole. The fixing seat and the annular seat are respectively provided with a giving structure corresponding to the position of the grinding disc, and 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, and a support frame is provided on the outer side of the positioning plate and / or the guide plate, and the bottom end of the support frame is fixed on the fixing seat.

5. The ultra-fine grinding equipment for producing soft ferrite cores according to claim 1, characterized in that: A material discharge notch is provided at the place where the tray is far from the grinding disc, a material receiving groove is provided below the material discharge notch, the width of the material receiving groove is adapted to the diameter of the workpiece, the material receiving groove is an inclined groove and the end close to the tray is the top end, a rectangular notch corresponding to its width is provided in the middle or lower part of the bottom of the material receiving groove, a strip frame adapted to the width of the straight groove of 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, and a material dividing opening that penetrates the groove wall of the material receiving groove is provided at one end of the friction plate close to the bottom end of the material receiving groove, and when the strip frame is inserted into the straight groove of the end face of the workpiece, the top face of the workpiece is lower than the top side of the material dividing opening; The bottom end of the material receiving trough is butt-jointed with a buffer trough extending obliquely in the same direction as the material receiving trough, a friction wheel driven by a motor is rotatably installed on one side of the buffer trough, a guide member is centered through the bottom notch of the buffer trough, the width of the guide member is adapted to the width of the slot of the workpiece, the end of the guide member close to the buffer trough is conical, when the circumferential surface of the workpiece contacts the conical tip of the guide member, the circumferential surface of the workpiece contacts the friction wheel at the same time, the end of the guide member away from the buffer trough is provided with a grinding wheel that rotates under motor control, the outer edge cross-section of the grinding wheel is consistent with the design shape of the slot of the workpiece.

6. The ultra-fine grinding equipment for producing soft ferrite cores according to claim 5, characterized in that: A dividing trough fixed to a receiving trough is provided on the outer side of the dividing port, the bottom of the dividing trough close to one end of the receiving trough extends below the dividing port, the width of the dividing trough corresponds to the diameter of the workpiece, the end of the dividing trough close to the receiving trough is the top end, the dividing trough is inclined downward in a direction away from the receiving trough, the end of the dividing trough away from the receiving trough is connected to a material guiding channel integrally formed therewith, the material guiding channel is a closed structure, the inner cavity of the material guiding channel is adapted to the shape of the workpiece, the material guiding channel is an arc-shaped channel with a 90-degree arc bend, the bottom end of the material guiding channel is a vertical channel extending vertically downward, and the bottom end of the material guiding channel is also connected to a buffer trough.

7. The ultra-fine grinding equipment for producing soft ferrite cores according to claim 5, characterized in that: Belt mechanisms are symmetrically arranged on both sides of the guide and the grinding wheel. The belt mechanism includes a machine plate. Axially vertical pulleys are respectively installed at both ends of the machine plate. A circular belt is wound between the two pulleys on the same side. The minimum spacing between the belts on both sides corresponds to the diameter of the workpiece.

8. The ultra-fine grinding equipment for producing soft ferrite cores according to claim 5, characterized in that: A slide frame connected to the bottom end of the buffer groove is provided, the slide frame extends horizontally, and the top surface of the slide frame is coplanar with the groove bottom of the buffer groove.

9. The ultra-fine grinding equipment for producing soft ferrite cores according to claim 9, characterized in that: The top end of the lower material barrel is connected to a feed trough fixed thereto, the feed trough is an inclined chute, and the bottom end of the feed trough is connected to the lower material barrel.

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