A device for chamfering the outside slots of a multi-slot core

Abstract

The application discloses a multi-slot core mold outer slot chamfering device, which comprises an upper mold assembly, a lower mold assembly, a ring-shaped mold module, a rotary driving mechanism and a lifting driving part. The lower mold assembly comprises a lower mold module, a lower floating plate arranged in a floating mode and a plurality of lower chamfering punches arranged at intervals. The upper mold assembly comprises an upper mold module, an upper floating plate arranged in a floating mode and a plurality of upper chamfering punches arranged at intervals. A top rod is arranged below the upper floating plate and is used for pressing downward the lower floating plate before the upper floating plate contacts the core, so that the chamfering time sequence of first downward and then upward in the same stroke is realized. The ring-shaped mold module is sleeved on the outer side of the lower mold assembly, the core is pre-positioned and is driven to rotate synchronously through a positioning piece. After the lifting driving part drives the upper mold assembly to complete the chamfering of the lower slot and the upper slot, the rotary driving mechanism drives the core to rotate in a division mode, so that the next group of mold slots are aligned with the punches, and the process is repeated until the chamfering of all the mold slots is completed. Through the floating structure and the multi-time chamfering scheme, the application reduces the stamping force and the mold cost, and improves the machining efficiency and the chamfering quality.

Description

Technical Field

[0001] This invention relates to the technical field of iron core processing, and in particular to a chamfering device for the outer groove of a multi-groove iron core mold. Background Technology

[0002] In existing technologies, the core of motors or electromagnetic equipment is usually formed by stamping multiple silicon steel sheets (laminated sheets) and then fixing them together as one piece through stacking, riveting, or welding. During processing, a stamping die is first used to cut out grooves for accommodating the windings on a single silicon steel sheet. Then, multiple laminations are stacked in a predetermined number of layers to form a core body with continuous through-slots.

[0003] However, this type of existing core structure has the following significant drawbacks. Due to limitations in stamping processes and mold design, sharp edges naturally form at the junction between the inner wall of the slot and the upper and lower surfaces of the laminations after stamping. When the core is composed of multiple layers of laminations, these sharp angles are continuously distributed along the depth of the slot, forming multiple stepped or continuous sharp edges. In subsequent coil winding or insertion processes, the enameled wire or insulated conductor needs to pass through the slot axially. During the relative movement of the conductor, the slot entrance is highly susceptible to scratching against the insulating varnish or insulating coating layer on the coil surface, resulting in scratches, wear, or even punctures. This physical damage significantly reduces the insulation performance of the coil, leading to a sharp increase in the risk of inter-turn short circuits or withstand voltage breakdown, seriously affecting the electrical reliability and service life of the motor. Furthermore, the sharp edges may also cause local magnetic flux saturation or distortion in the magnetic circuit, increasing iron losses.

[0004] To address the aforementioned coil scratching problem, one known improvement approach is to chamfer the edges of the groove, i.e., remove or blunt the sharp angles at the upper and lower end faces of the groove to reduce the cutting effect on the coil. However, existing technologies lack efficient chamfering solutions specifically for this application scenario, especially for stacked iron cores with deep grooves. Summary of the Invention

[0005] In view of the problems in the prior art, the technical problem to be solved by the present invention is to provide an efficient and high-precision chamfering device for the outer groove of a multi-groove iron core mold.

[0006] The technical solution provided by the present invention to solve the above-mentioned technical problems is as follows: a chamfering device for the outer groove of a multi-groove iron core mold, used to chamfer the groove opening of the iron core, comprising an upper mold assembly, a lower mold assembly, an annular module, a rotary drive mechanism and a lifting drive component; The lower mold assembly includes a lower module, a lower floating plate that is floatingly disposed above the lower module via a lower elastic component, and a plurality of mutually spaced lower chamfering punches corresponding to the molding slot of the iron core portion; the lower floating plate is provided with a lower punch hole, and when it is pressed close to the lower module, the lower punching end of the lower chamfering punch protrudes through the lower punch hole. The upper mold assembly includes an upper module, an upper floating plate that is floatingly disposed below the upper module via an upper elastic component, and a plurality of upper chamfering punches spaced apart from each other and corresponding to the shaped groove of the iron core portion; the upper floating plate is provided with an upper punch hole, and when it is pressed close to the upper module, the upper punching end of the upper chamfering punch protrudes through the upper punch hole. The lower surface of the upper floating plate is provided with a push rod, which is used to push the lower floating plate downward through the through hole of the iron core before the upper floating plate contacts the iron core; The annular module is fitted onto the outside of the lower mold assembly, and several positioning elements are fixed on it. The positioning elements are used to pre-position the iron core placed on the lower floating plate and make it rotate synchronously with the annular module; the rotation drive mechanism drives the annular module to rotate relative to the lower mold assembly. The lifting drive unit drives the upper mold assembly to lift and lower in sequence to complete the chamfering of the lower slot, the chamfering of the upper slot, and the reset. After each chamfering of the upper and lower slots is completed, the rotary drive mechanism drives the iron core to rotate by an angle so that the next set of slots is aligned with the punch. The above process is repeated until all slots are chamfered.

[0007] The preferred technical solution provided by the present invention to solve the above-mentioned technical problem is as follows: the surfaces of the upper stamping end and the lower stamping end are provided with raised punches, and the top edge of the punches is rounded.

[0008] The preferred technical solution provided by the present invention to solve the above-mentioned technical problem is: each stamping end has two spaced-apart punches on its surface.

[0009] The preferred technical solution provided by the present invention to solve the above-mentioned technical problems is as follows: the annular module has an annular top surface and an outer peripheral wall, and a plurality of positioning elements are provided on the annular top surface; the outer peripheral wall includes an upper protective cover wall and a lower annular wheel wall, and annular limiting portions are provided at the upper and lower ends of the annular wheel wall; a belt is sleeved on the outer periphery of the annular wheel wall and located between the two annular limiting portions, and the rotation drive mechanism is a servo motor, which drives the annular module to rotate through the belt.

[0010] The preferred technical solution provided by the present invention to solve the above-mentioned technical problems is as follows: the upper module includes, from top to bottom, an upper mold base, an upper pad, and an upper clamping plate; The suspension component fixed to the upper mold base passes through the upper pad and the upper clamping plate in sequence and is connected to the upper floating plate. The upper pad and the upper clamping plate are fastened together by the first screw. The push rod passes through the upper floating plate, the upper clamping plate and the upper pad plate from bottom to top. The upper end of the push rod is provided with a limiting head, which is limited by the upper pad plate. A first spring is provided between the limiting head and the upper mold base.

[0011] The preferred technical solution provided by the present invention to solve the above-mentioned technical problems is as follows: the upper mold base is provided with a central spring hole, the first spring is disposed in the central spring hole, the upper end of the central spring hole is sealed by a first plug nut fixed on the upper mold base, and the two ends of the first spring abut against the first plug nut and the limiting head respectively.

[0012] The preferred technical solution provided by the present invention to solve the above-mentioned technical problem is as follows: a plurality of second springs are provided between the upper mold base and the upper pad, and the plurality of second springs are arranged around the first spring.

[0013] The preferred technical solution provided by the present invention to solve the above-mentioned technical problems is as follows: the upper mold base is provided with an outer spring hole, the second spring is provided in the outer spring hole, the upper pad is provided with a first screw countersunk hole to accommodate the head of the first screw, the upper end of the outer spring hole is sealed by a second plug nut fixed on the upper mold base, and the two ends of the second spring abut against the second plug nut and the head of the first screw, respectively.

[0014] The preferred technical solution provided by the present invention to solve the above-mentioned technical problems is as follows: the positioning member has a triangular tip, and the triangular tip extends into the longitudinal groove on the outer periphery of the iron core.

[0015] The preferred technical solution provided by the present invention to solve the above-mentioned technical problems is as follows: the annular module is covered with a fixing cover, the fixing cover is fixed on the lower mold base of the lower mold assembly, the upper end of the fixing cover is provided with a limiting part extending towards the center, the inner end of the limiting part is bent downward to fasten the upper edge of the annular module, so that the annular module can rotate inside the fixing cover and is limited above by the limiting part.

[0016] Compared with existing technologies, the advantages of this invention are as follows: Through the floating design of the upper and lower floating plates, combined with the timing control of the push rod, the lower and upper groove chamfering are completed sequentially within the same pressing stroke, eliminating the need for two pressing operations or workpiece flipping, thus significantly improving processing efficiency. The chamfering sequence is precisely controlled by the extension length of the push rod, ensuring reliable timing; the floating reset function allows the stamping end to automatically disengage from the groove after completion, avoiding jamming and ensuring continuous operation.

[0017] Furthermore, each stamping operation only processes a portion of the slots, reducing the number of punches and lowering the difficulty and cost of mold manufacturing. Then, through the indexing rotation of the annular module, the iron core rotates sequentially by a predetermined angle, ultimately covering the entire slot. This invention processes only a portion of the slots each time, requiring less stamping force, allowing the use of smaller equipment, and significantly reducing investment and energy consumption. Meanwhile, traditional full-punch designs require all punches to have strictly consistent heights, making manufacturing and assembly extremely difficult. This invention, however, possesses adaptive adjustment capabilities; manufacturing errors in a single slot only affect that slot itself, not the overall design. Attached Figure Description

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0019] Figure 1 A schematic diagram of the external groove chamfering device for multi-groove iron core mold and the iron core in its initial state; Figure 2 A schematic diagram showing the chamfering device for the outer groove of a multi-groove iron core mold and the iron core in the chamfered state; Figure 3 An exploded view of the chamfering device for the outer groove of a multi-groove iron core mold; Figure 4 An exploded view of an explosion-proof diagram of a chamfering device for the outer groove of a multi-groove iron core mold; Figure 5 A schematic diagram of the lower mold assembly for a multi-groove iron core mold outer groove chamfering device; Figure 6 for Figure 5 A magnified view of point A in the diagram; Figure 7 A schematic diagram of the upper mold assembly for a chamfering device for the outer groove of a multi-groove iron core mold; Figure 8 A schematic diagram of the initial state of the external slot chamfering device for multi-slot iron core molds. Figure 1 ; Figure 9 for Figure 8 A magnified view of point B in the diagram; Figure 10 A schematic diagram of the initial state of the external slot chamfering device for multi-slot iron core molds. Figure 2 ; Figure 11 for Figure 10 A magnified view of point C in the diagram; Figure 12A schematic diagram of the first stage of chamfering for a multi-groove iron core mold outer groove chamfering device; Figure 13 for Figure 12 A magnified view of a portion of point D in the diagram; Figure 14 A schematic diagram of the second stage of chamfering for a multi-groove iron core mold outer groove chamfering device; Figure 15 for Figure 14 A magnified view of point E in the diagram; Figure 16 This is a schematic diagram of a multi-slot iron core; Figure 17 This is a schematic diagram of the positioning component.

[0020] Figure label: Upper die assembly 2; Lower die assembly 3; Ring module 4; Rotary drive mechanism 5; Servo motor 50; Lower module 31; Lower floating plate 32; Lower elastic component 34; Lower punch hole 321; Iron core 100; Slot 101; Lower chamfered punch 33; Lower stamping end 331; Upper module 21; Upper floating plate 22; Upper elastic component 24; Upper punch hole 221; Upper chamfered punch 23; Upper stamping end 231; Upper slot 101a; Ejector rod 25; Positioning component 41; Punch rib 332; Ring top surface 42; Outer peripheral wall 43; Protective cover wall 431; Ring wheel wall 432; Ring limiting part 433; Belt 44; Triangular tip End 411; Longitudinal groove 102; Motor support 52; Motor fixing plate 51; Clearance 53; Upper mold base 211; Upper pad 212; Upper clamping plate 213; Suspension component 214; First screw 215; Limiting head 251; First spring 252; Central spring hole 216; First plug nut 217; Second spring 218; Outer spring hole 219; Second plug nut 2111; First screw countersunk hole 2121; Lower mold base 311; Lower pad 312; Lower clamping plate 313; Second screw 314; Third spring 341; Fixing cover 45; Limiting part 451; Guide post structure 7; Guide post 71; Guide sleeve 7. Detailed Implementation

[0021] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of the invention.

[0022] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0023] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] like Figure 1-15 As shown in the figure, this embodiment provides a chamfering device for the outer groove of a multi-groove iron core mold. The overall structure of the device will be described in detail below.

[0026] like Figures 1 to 4 As shown, the device mainly includes an upper mold assembly 2, a lower mold assembly 3, a ring module 4, a rotary drive mechanism 5, and a lifting drive component (not shown in the figure).

[0027] like Figures 1 to 4 as well as Figure 5 , Figure 16 As shown, the lower mold assembly 3 includes a lower module 31, a lower floating plate 32, and multiple lower chamfering punches 33. The lower floating plate 32 is floatingly positioned above the lower module 31 via a lower elastic component 34. "Floating" means that the lower floating plate 32 has a certain elastic displacement space relative to the lower module 31 in the vertical direction—when not subjected to external force, the lower floating plate 32 remains at a relatively high initial position under the action of the elastic component; when subjected to downward pressure, the lower floating plate 32 overcomes the elastic force and moves downward, closer to the lower module 31. The lower floating plate 32 is provided with a lower punch hole 321. When the iron core 100 is placed on the upper surface of the lower floating plate 32, the lower groove opening of the groove 101 of the iron core 100 corresponds vertically to the lower punch hole 321.

[0028] like Figures 1 to 4 as well as Figure 5 , Figure 16As shown, multiple lower chamfering punches 33 correspond to parts of the slots 101 of the iron core 100, and the multiple lower chamfering punches 33 are arranged at intervals. The term "intervals" means that the lower chamfering punches 33 are not continuously arranged at all slots 101 positions, but are arranged at certain intervals, so that only part of the slots 101 are chamfered in one stamping stroke. The lower end of the lower chamfering punch 33 is fixed to the lower module 31, and its upper end is the lower stamping end 331, which is initially located inside the lower punch hole 321 or below the upper surface of the lower floating plate 32. When the lower floating plate 32 is pressed close to the lower module 31, the lower stamping end 331 of the lower chamfering punch 33 protrudes upward through the lower punch hole 321 and extends into the lower slot of the iron core 100 to chamfer the edge of the lower slot.

[0029] like Figures 1 to 4 as well as Figure 7 , Figure 16 As shown, the upper die assembly 2 includes an upper module 21, an upper floating plate 22, and multiple upper chamfering punches 23. The upper floating plate 22 is floatingly positioned below the upper module 21 via an upper elastic component 24. Similar to the floating principle of the lower die assembly 3, the upper floating plate 22 has elastic displacement space relative to the upper module 21 in the vertical direction. The upper floating plate 22 is provided with an upper punch hole 221. The multiple upper chamfering punches 23 correspond to the partial grooves 101 of the iron core 100, and the multiple upper chamfering punches 23 are arranged at intervals between each other. The upper end of the upper chamfering punch 23 is fixed to the upper module 21, and its lower end is the upper stamping end 231, which is initially located inside the upper punch hole 221 or above the lower surface of the upper floating plate 22. When the upper floating plate 22 is pressed close to the upper module 21, the upper punching end 231 of the upper chamfering punch 23 protrudes downward through the upper punch hole 221 and extends into the upper slot 101a of the iron core 100 to chamfer the edge of the upper slot 101a.

[0030] like Figures 1 to 4 as well as Figure 7 , Figure 16 As shown, a push rod 25 is provided on the lower surface of the upper floating plate 22. The push rod 25 is used to push the lower floating plate 32 downward through the through hole of the iron core 100 before the upper floating plate 22 contacts the iron core 100. The setting of the push rod 25 is the key structure for realizing the "bottom-then-top" chamfering sequence in this embodiment.

[0031] like Figures 1 to 4 as well as Figure 16As shown, the annular module 4 is fitted onto the outside of the lower die assembly 3. The annular module 4 is ring-shaped and can rotate relative to the lower die assembly 3 around its central axis. Several positioning elements 41 are fixed on the annular module 4. The positioning elements 41 are used to pre-position the iron core 100 placed on the lower floating plate 32 and make it rotate synchronously with the annular module 4. Specifically, when the iron core 100 is placed on the lower floating plate 32, the positioning elements 41 cooperate with the outer peripheral wall or outer peripheral structure of the iron core 100 to pre-position the circumferential position of the iron core 100, ensuring that the groove 101 of the iron core 100 maintains the correct correspondence with the lower punch hole 321 and the upper punch hole 221 in the circumferential direction. When the annular module 4 rotates, the positioning elements 41 drive the iron core 100 to rotate synchronously, realizing the indexing switching of the groove 101.

[0032] The rotary drive mechanism 5 drives the ring module 4 to rotate relative to the lower mold assembly 3. The rotary drive mechanism 5 is typically a servo motor, which transmits rotational torque to the ring module 4 via a transmission mechanism. The precise angle control capability of the servo motor allows the ring module 4 to rotate in predetermined angular intervals.

[0033] The lifting drive component is used to drive the upper mold assembly 2 to move downwards. The lifting drive component can be a pneumatic cylinder, hydraulic cylinder, or electric cylinder, and its output end is connected to the upper module 21. When the lifting drive component is activated, the upper mold assembly 2 moves downwards as a whole, approaching the lower mold assembly 3.

[0034] Based on the above structure, the working process of the chamfering device in this embodiment is as follows: Step 1: As Figure 1 , Figures 8 to 11 , Figure 16 As shown, the iron core 100 to be processed is placed on the upper surface of the lower floating plate 32. The positioning member 41 pre-positions the iron core 100 so that a portion of the groove 101 on the lower end face of the iron core 100 corresponds one-to-one with the lower punch hole 321, while the corresponding groove 101 on the upper end face of the iron core 100 corresponds one-to-one with the upper punch hole 221.

[0035] Step 2: As Figures 12 to 13 , Figure 16 As shown, the lifting drive component drives the upper mold assembly 2 to move downwards. In the initial stage of the downward movement of the upper mold assembly 2, the push rod 25 moves downwards with the upper floating plate 22, and its lower end first contacts the upper surface of the lower floating plate 32 before entering the first chamfering stage. The push rod 25 continues to press the lower floating plate 32 downwards, and the lower floating plate 32 overcomes the elastic force of the lower elastic component 34 and moves downwards, approaching the lower module 31. During the downward movement of the lower floating plate 32, the lower punching end 331 of the lower chamfering punch 33 protrudes upwards relative to the lower floating plate 32, passes through the lower punch hole 321 and extends upwards into the lower slot of the iron core 100, and punches and chamfers the edge of the lower slot. At this time, the upper floating plate 22 has not yet contacted the iron core 100, and the upper chamfering punch 23 has not yet moved.

[0036] Step 3: As Figure 2 , Figures 14 to 16 As shown, the upper mold assembly 2 moves further downward. Due to the pushing of the push rod 25, the lower floating plate 32 has descended to its limit position, and the iron core 100 moves downward accordingly. At this time, the lower surface of the upper floating plate 22 begins to contact the upper end face of the iron core 100. As the upper module 21 continues to move downward, the upper floating plate 22 moves upward relative to the upper module 21, overcoming the elastic force of the upper elastic assembly 24 and approaching the upper module 21. During the upward movement of the upper floating plate 22, the upper punching end 231 of the upper chamfering punch 23 protrudes downward relative to the upper floating plate 22, passes through the upper punch hole 221 and extends downward into the upper slot 101a of the iron core 100, and punches and chamfers the edge of the upper slot 101a.

[0037] Thus, within the same downward stroke, the lower and upper slot chamfers are completed sequentially. This bottom-to-top sequence is determined by the set length of the push rod 25 and the floating stroke of the upper and lower floating plates. The length of the push rod 25 ensures that it contacts the lower floating plate 32 and completes the lower chamfer before the iron core 100 is contacted, and then the upper floating plate 22 contacts the iron core 100 and completes the upper chamfer.

[0038] Step 4: After the chamfering is completed, the lifting drive unit drives the upper mold assembly 2 to move upward. During the upward movement of the upper mold assembly 2, the upper stamping end 231 disengages from the upper slot 101a, and the upper floating plate 22 rebounds downward and resets under the elastic restoring force of the upper elastic component 24; the push rod 25 disengages from the lower floating plate 32 as the upper mold assembly 2 rises, and the lower floating plate 32 rebounds upward and resets under the elastic restoring force of the lower elastic component 34, and the lower stamping end 331 disengages from the lower slot.

[0039] Step 5: After completing the chamfering of the lower and upper slots and resetting, the rotary drive mechanism 5 drives the annular module 4 to rotate by a preset angle. The annular module 4, through the positioning element 41, synchronously drives the iron core 100 to rotate by the same angle. After rotation, the next set of adjacent slots that have not yet been chamfered aligns with the lower punch hole 321 and the upper punch hole 221. Repeat the above steps until all slots 101 of the iron core 100 are chamfered.

[0040] In summary, this embodiment, through the floating design of the upper floating plate 22 and the lower floating plate 32, combined with the timing control of the push rod 25, automatically completes the two processes of lower and upper groove chamfering within the same pressing stroke, eliminating the need for two pressing operations or workpiece flipping, thus significantly improving processing efficiency. The chamfering sequence of the upper and lower grooves is precisely controlled by the extension length of the push rod 25, ensuring the reliability of the processing sequence. Furthermore, the floating reset function of the lower elastic component 34 and the upper elastic component 24 ensures that the stamping end can automatically disengage from the groove after stamping, avoiding jamming between the punch and the workpiece, and guaranteeing the continuity and reliability of equipment operation.

[0041] Furthermore, by arranging the upper chamfering punch 23 and the lower chamfering punch 33 at intervals rather than continuously covering all the slots, only a portion of the slots are chamfered during each stamping stroke, reducing the number of punches required and lowering the difficulty and cost of mold manufacturing. Simultaneously, through the indexing rotation of the annular module 4, the iron core 100 is rotated sequentially by a predetermined angle, ultimately covering all the slots 101, achieving chamfering of all slots with a smaller number of punches.

[0042] It should be noted that the number of slots in iron cores is usually quite large; typical motor stator iron cores have 24, 36, or even 48 slots. If a punch with the exact same number of slots is used to chamfer all slots in one stroke, the total punching force required would be very large. This means that a large-tonnage hydraulic press or stamping equipment must be used, drastically increasing equipment costs and placing higher demands on the factory foundation and power supply. In contrast, the chamfering scheme of this invention chamfers only a portion of the slots at a time, requiring a smaller total punching force. It can use small, low-cost stamping equipment, significantly reducing equipment investment and operating energy consumption.

[0043] Furthermore, traditional full-punch designs require all punches to be precisely installed on the same upper and lower modules, and the height of all punches must be strictly consistent. Any error can easily lead to punch chipping or breakage. During machining and assembly, ensuring the height tolerance of dozens of punches is within the micrometer level is extremely difficult and costly to manufacture. However, the solution in this embodiment can adaptively adjust; even if individual slots have manufacturing errors, it only affects the machining of that slot in a single operation and will not simultaneously affect all slots.

[0044] Furthermore, in this embodiment, the device achieves rapid pre-positioning and synchronous rotation of the iron core 100 through the cooperation of the annular module 4 and the positioning component 41. The positioning component 41 ensures that the iron core 100 is correctly aligned with the punch position when placed; the rotation of the annular module 4 drives the iron core 100 to rotate synchronously, eliminating the need for an additional separate workpiece rotation mechanism and simplifying the device structure.

[0045] As a further preferred embodiment, such as Figure 6 , Figure 9 , Figure 11 , Figure 13 , Figure 15 As shown, both the upper stamping end 231 and the lower stamping end 331 have raised punches 332 on their surfaces, and the top edges of the punches 332 are rounded. More preferably, each stamping end has two spaced-apart punches 332 on its surface.

[0046] During the stamping process, the tip edge of the punch 332 first contacts the sharp edge of the slot, compressing and shearing the sharp edge to induce plastic deformation and form a rounded corner. Because the tip edge of the punch 332 is rounded, the stamping area is reduced, resulting in higher pressure per unit area under the same stamping force. This facilitates precise compression and shearing of the slot's sharp edge. Consequently, the pressure applied when in contact with the workpiece is distributed in an arc shape, resulting in a smooth and uniform chamfered surface at the slot edge, free from obvious indentations or scratches. The resulting chamfered surface quality is higher, and stress concentration within the punch 332 itself is reduced, extending the punch's service life.

[0047] like Figure 3 As shown, the annular module 4 has an annular top surface 42 and an outer peripheral wall 43. The annular top surface 42 is provided with a plurality of positioning elements 41. The outer peripheral wall 43 includes an upper protective cover wall 431 and a lower annular wheel wall 432.

[0048] The protective cover wall 431 isolates the lower mold assembly 3 from the outside environment, improving operational safety. The annular wheel wall 432 has annular limiting parts 433 at its upper and lower ends, and the annular space between the two limiting parts 433 forms a belt groove. The belt 44 is fitted around the outer circumference of the annular wheel wall 432 and located between the two limiting parts 433. The output end of the servo motor 50 is connected to the annular wheel wall 432 via the belt 44. When the servo motor 50 rotates, it drives the annular module 4 to rotate around its central axis via the belt 44. The two limiting parts 433 limit the belt 44, preventing it from slipping off the annular wheel wall 432 during operation.

[0049] As a further preferred embodiment, such as Figure 16 , 17 As shown, the inner end of the positioning element 41 is a triangular tip 411, i.e., a pointed structure with a triangular cross-section. The outer periphery of the iron core 100 typically has a longitudinal groove 102. The triangular cross-section of the triangular tip 411 matches the cross-sectional shape of the longitudinal groove 102. When the triangular tip 411 is inserted into the longitudinal groove 102, the two side walls of the groove exert a constraint force on the two inclined surfaces of the triangular tip 411, achieving precise positioning of the iron core 100 in the circumferential direction. Based on the above, the fit between the triangular tip 411 and the longitudinal groove 102 is a self-centering fit. Even if there is a slight circumferential deviation in the iron core 100 during placement, the triangular tip 411 will guide the iron core 100 to automatically rotate to the correct position during its entry into the longitudinal groove 102. This positioning method has a simple structure, high positioning accuracy, and requires no additional clamping device. Simultaneously, the inclined surface of the triangular tip 411 and the side wall of the groove are in surface contact, reliably transmitting rotational torque when the annular module 4 drives the iron core 100 to rotate, preventing slippage.

[0050] like Figure 4 As shown, the motor support 52 is fixedly mounted on the equipment base, the motor mounting plate 51 is fixed to one side of the motor support 52, and the main body of the servo motor 50 is fixed to the motor mounting plate 51. The motor support 52 has an internal clearance 53, and the output end of the servo motor 50 passes through the motor mounting plate 51 and extends into the clearance 53. The belt 44 extends from the annular wheel wall 432 of the annular module 4 to the clearance 53 of the motor support 52, and connects to the output end of the servo motor 50 within the clearance 53.

[0051] As a further preferred embodiment, such as Figure 4 , Figure 7 As shown, the upper module 21 includes, from top to bottom, an upper mold base 211, an upper pad 212, and an upper clamping plate 213. A suspension member 214, fixed to the upper mold base 211, passes through the upper pad 212 and the upper clamping plate 213 and connects to the upper floating plate 22. The suspension member 214 suspends the upper floating plate 22 below the upper clamping plate 213. The upper pad 212 and the upper clamping plate 213 are fastened together by a first screw 215. The upper end of the upper chamfering punch 23 is fixed to the upper pad 212 and extends downwards from the upper pad 212 through the upper clamping plate 213.

[0052] The ejector pin 25 passes through the upper floating plate 22, the upper clamping plate 213, and the upper pad plate 212 sequentially from bottom to top. A limiting head 251 is provided at the upper end of the ejector pin 25. The limiting head 251 is limited by the upper pad plate 212, meaning its outer diameter is larger than the diameter of the hole through which the ejector pin 25 passes, preventing the ejector pin 25 from disengaging from bottom to top. A first spring 252 is provided between the limiting head 251 and the upper mold base 211. The first spring 252 applies a downward elastic force to the limiting head 251, keeping the ejector pin 25 in a downwardly extended position in its free state.

[0053] In this preferred embodiment, the three-layer structure of the upper die base 211, upper pad 212, and upper clamping plate 213 provides a stable base for punch mounting and for suspending the floating plate. The suspension member 214 reliably suspends the upper floating plate 22 below the upper clamping plate 213, and the upper elastic component 24 provides a restoring force when the upper floating plate 22 moves upward relative to the upper die 21. The push rod 25 is limited by the limiting head 251 and provides downward preload via the first spring 252, ensuring that the push rod 25 reliably contacts and presses against the lower floating plate 32.

[0054] like Figure 7As shown, a central spring hole 216 is provided inside the upper mold base 211, extending vertically. The upper end of the central spring hole 216 is sealed by a first plug nut 217 fixed on the upper mold base 211. The first spring 252 is accommodated in the central spring hole 216, with its upper end abutting against the lower end face of the first plug nut 217 and its lower end abutting against the upper end face of the limiting head 251. The first plug nut 217 is fixed to the upper end of the upper mold base 211 by a threaded connection or interference fit, sealing the upper opening of the central spring hole 216. The central spring hole 216 provides precise guidance and installation space for the first spring 252, ensuring that the first spring 252 maintains the correct axial posture during compression and rebound, without bending or deflection. The first plug nut 217 serves as an upper support for the spring, facilitating spring installation and replacement; that is, the first spring 252 can be removed or installed simply by unscrewing the first plug nut 217, making maintenance convenient.

[0055] In addition, such as Figure 4 , Figure 7 As shown, multiple second springs 218 are also provided between the upper mold base 211 and the upper pad 212, and these second springs 218 form the upper elastic component 24. The multiple second springs 218 are arranged around the first spring 252 and are also compression springs, with their force in the same direction as the first spring 252. This multi-point spring arrangement ensures that when the upper floating plate 22 moves upward under the reaction force of the iron core 100, the elastic restoring force it receives is evenly distributed in the circumferential direction, avoiding uneven force distribution and skewness of the upper floating plate 22 caused by a single spring. This ensures that the stamping end of the upper chamfering punch 23 can evenly contact all edges of the upper slot 101a, improving the consistency of the chamfering quality.

[0056] As a preferred option, such as Figure 7 As shown, in this embodiment, the upper mold base 211 has an outer spring hole 219, and the second spring 218 is disposed in the outer spring hole 219. The upper pad 212 has a first screw countersunk hole 2121 for accommodating the head of the first screw 215. The upper end of the outer spring hole 219 is sealed by a second plug nut 2111 fixed on the upper mold base 211. The upper end of the second spring 218 abuts against the lower end face of the second plug nut 2111, and the lower end abuts against the head of the first screw 215. This, along with the installation principle of the first spring 252, increases the structural compactness while making installation and maintenance more convenient.

[0057] Similarly, such as Figure 5As shown, the lower module 31 includes, from bottom to top, a lower die base 311, a lower pad 312, and a lower clamping plate 313. The lower die base 311 serves as the mounting base for the entire lower die assembly 3 and is fixed to the base of the equipment or the workbench. The lower pad 312 is fixed above the lower die base 311, and the lower die base 311 and the lower pad 312 are fastened together with fasteners. The lower clamping plate 313 is fixed above the lower pad 312, and the lower pad 312 and the lower clamping plate 313 are fastened together with a second screw 314. The lower end of the lower chamfering punch 33 is fixed to the lower pad 312, and the upper end of the lower chamfering punch 33 passes through the lower clamping plate 313 and extends below the lower punch hole 321.

[0058] like Figure 4 , Figure 5 As shown, multiple third springs 341 are also provided between the lower mold base 311 and the lower pad 312. The arrangement of the third springs 341 in the lower mold assembly 3 is the same as that of the second springs 218 in the upper mold assembly 2. That is, a spring hole is opened in the lower mold base 311, the lower end of the spring hole is sealed by a plug nut, the lower end of the spring abuts against the plug nut, and the upper end abuts against the corresponding screw head, thereby realizing the floating support and elastic reset of the lower floating plate 32.

[0059] As a preferred technical solution in this embodiment, as shown in the figure, the annular module 4 is fitted with a fixing cover 45. The fixing cover 45 is a cylindrical component that fits over the annular module 4, and its lower end is fixed to the lower mold base 311. The upper end of the fixing cover 45 has a limiting part 451 extending towards the center. The inner end of the limiting part 451 bends downward to form a hook-shaped structure. This hook-shaped structure catches the upper edge of the annular module 4 from above, restricting the upward displacement of the annular module 4 in the vertical direction, but allowing the annular module 4 to rotate freely around its central axis within the fixing cover 45. The fixing cover 45 can prevent the annular module 4 from moving upward due to vibration or force during the drive of the belt 44, ensuring that the positioning member 41 is always at the correct working height. At the same time, the hook-shaped structure of the limiting part 451 does not restrict the rotational freedom of the annular module 4, allowing the annular module 4 to rotate freely. The fixing cover 45 also further provides protection by enclosing the transmission area of ​​the annular module 4 and the belt 44, improving safety.

[0060] like Figure 3 , Figure 4As shown, a guide post structure 7 is provided between the upper die base 211 and the lower die base 311. The guide post structure 7 includes a guide post 71 fixed on the lower die base 311 and a guide sleeve 72 fixed on the upper die base 211. The guide post 71 extends vertically, and the guide sleeve 72 is slidably fitted onto the outside of the guide post 71. When the lifting drive drives the upper die assembly 2 to move up and down, the guide sleeve 72 slides along the guide post 71, guiding the movement of the upper die assembly 2. The guide post structure 7 ensures that the upper die assembly 2 maintains a horizontal posture during the up and down movement, without tilting or deflecting, thereby ensuring the coaxiality and positional accuracy between the upper chamfering punch 23 and the lower chamfering punch 33.

[0061] The foregoing has provided a detailed description of a chamfering device for the outer groove of a multi-groove iron core mold. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely for the purpose of helping to understand the invention and its core concepts. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of this invention.

Claims

1. A chamfering device for the outer groove of a multi-groove iron core mold, used to chamfer the groove opening of the iron core mold, characterized in that, Includes upper mold assembly, lower mold assembly, ring module, rotary drive mechanism and lifting drive component; The lower mold assembly includes a lower module, a lower floating plate that is floatingly disposed above the lower module via a lower elastic component, and a plurality of mutually spaced lower chamfering punches corresponding to the molding slot of the iron core portion; the lower floating plate is provided with a lower punch hole, and when it is pressed close to the lower module, the lower punching end of the lower chamfering punch protrudes through the lower punch hole. The upper mold assembly includes an upper module, an upper floating plate that is floatingly disposed below the upper module via an upper elastic component, and a plurality of upper chamfering punches spaced apart from each other and corresponding to the shaped groove of the iron core portion; the upper floating plate is provided with an upper punch hole, and when it is pressed close to the upper module, the upper punching end of the upper chamfering punch protrudes through the upper punch hole. The lower surface of the upper floating plate is provided with a push rod, which is used to push the lower floating plate downward through the through hole of the iron core before the upper floating plate contacts the iron core; The annular module is fitted onto the outside of the lower mold assembly, and several positioning elements are fixed on it. The positioning elements are used to pre-position the iron core placed on the lower floating plate and make it rotate synchronously with the annular module; the rotation drive mechanism drives the annular module to rotate relative to the lower mold assembly. The lifting drive unit drives the upper mold assembly to lift and lower in sequence to complete the chamfering of the lower slot, the chamfering of the upper slot, and the reset. After each chamfering of the upper and lower slots is completed, the rotary drive mechanism drives the iron core to rotate by an angle so that the next set of slots is aligned with the punch. The above process is repeated until all slots are chamfered.

2. The chamfering device for the outer groove of a multi-groove iron core mold according to claim 1, characterized in that, Both the upper stamping end and the lower stamping end have raised punches on their surfaces, and the top edge of the punches is rounded.

3. The chamfering device for the outer groove of a multi-groove iron core mold according to claim 3, characterized in that, Each stamping end has two spaced-apart punches on its surface.

4. A chamfering device for the outer groove of a multi-groove iron core mold according to claim 1, characterized in that, The annular module has an annular top surface and an outer peripheral wall. The annular top surface is provided with a plurality of positioning elements. The outer peripheral wall includes an upper protective cover wall and a lower annular wheel wall. The upper and lower ends of the annular wheel wall are provided with annular limiting parts. A belt is sleeved on the outer periphery of the annular wheel wall and located between the two annular limiting parts. The rotation drive mechanism is a servo motor, which drives the annular module to rotate through the belt.

5. A chamfering device for the outer groove of a multi-groove iron core mold according to claim 4, characterized in that, The upper module, from top to bottom, includes an upper mold base, an upper pad, and an upper clamping plate; The suspension component fixed to the upper mold base passes through the upper pad and the upper clamping plate in sequence and is connected to the upper floating plate. The upper pad and the upper clamping plate are fastened together by the first screw. The push rod passes through the upper floating plate, the upper clamping plate and the upper pad plate from bottom to top. The upper end of the push rod is provided with a limiting head, which is limited by the upper pad plate. A first spring is provided between the limiting head and the upper mold base.

6. A chamfering device for the outer groove of a multi-groove iron core mold according to claim 5, characterized in that, The upper mold base is provided with a central spring hole, and the first spring is disposed in the central spring hole. The upper end of the central spring hole is sealed by a first plug nut fixed on the upper mold base, and the two ends of the first spring abut against the first plug nut and the limiting head, respectively.

7. A chamfering device for the outer groove of a multi-groove iron core mold according to claim 6, characterized in that, A plurality of second springs are provided between the upper mold base and the upper pad, and the plurality of second springs are arranged around the first spring.

8. A chamfering device for the outer groove of a multi-groove iron core mold according to claim 7, characterized in that, The upper mold base is provided with an outer spring hole, and the second spring is provided in the outer spring hole. The upper pad is provided with a first screw countersunk hole to accommodate the head of the first screw. The upper end of the outer spring hole is sealed by a second plug nut fixed on the upper mold base. The two ends of the second spring abut against the second plug nut and the head of the first screw, respectively.

9. A chamfering device for the outer groove of a multi-groove iron core mold according to claim 1, characterized in that, The positioning element has a triangular tip that extends into a longitudinal groove on the outer periphery of the iron core.

10. A chamfering device for the outer groove of a multi-groove iron core mold according to claim 1, characterized in that, The annular module is covered with a fixing cover, which is fixed to the lower mold base of the lower mold assembly. The upper end of the fixing cover is provided with a limiting part extending towards the center. The inner end of the limiting part is bent downward to fasten the upper edge of the annular module, so that the annular module can rotate inside the fixing cover and is limited above by the limiting part.

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