Flat-wire flat-winding coil processing technology and flat-wire flat-winding coil processing device
By stacking the conductive wire and the insulating wire in a coil blank, combined with the first and second stamping dies, the coil thickness is gradually reduced, solving the problem of tearing of the flat conductive wire coil during the winding process, and achieving a thinner flat wire coil suitable for small-sized machinery.
Patent Information
- Application Number
- CN202511123853.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-12
- Publication Date
- 2025-10-17
AI Technical Summary
In the prior art, flat conductive wire coils are easily torn during the winding process, which makes it impossible to produce very thin coils, limiting their use in small-size application scenarios.
A coil blank is made of a stacked conductive wire and an insulating wire. The thickness of the coil turns is gradually reduced through the first and second stamping dies. The hot stamping technology is used to thin the coil without tearing it, forming a flat-wire coil that meets the requirements.
It achieves thinner flat wire coils, which are suitable for more small-sized mechanical application scenarios, avoids the tearing problem during the winding process, and improves the qualified rate of the finished coils.
Smart Images
Figure CN120809476A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of electric coil manufacturing, in particular to a flat wire flat-wound coil processing technology and a flat wire flat-wound coil processing device. BACKGROUND
[0002] The flat electric coil is an electromagnetic element wound by flat electric wires with rectangular or elliptical cross sections, and is widely used in the fields of power electronics, motors and filters, and is more widely used in some transformers, inductors or axial flux motors. In the prior art, the flat electric coil is mostly wound by flat winding, that is, the long side of the flat wire cross section is arranged perpendicular to the axial direction of the coil, and then the flat wire is wound around the axis to form a coil. In the prior art, the corners of the flat electric coil are prone to tearing during winding, so the wire used in the coil needs to have a certain thickness and cannot be too thin, but in some small size application scenarios, such as small power axial flux motors, the use of flat-wound flat electric coils will be limited. SUMMARY
[0003] The main purpose of the present application is to provide a flat wire flat-wound coil processing technology, which aims to process a flat electric coil with smaller size, so that the flat electric coil can be used in more application scenarios.
[0004] To achieve the above purpose, the flat wire flat-wound coil processing technology provided by the present application comprises the following steps:
[0005] S1, providing a coil blank;
[0006] S2, winding the coil blank into a coil according to a predetermined mode to obtain a first coil;
[0007] S3, placing the first coil into a first stamping die, setting the temperature of the first stamping die to a first predetermined temperature, the first stamping die having a first punch, the first stamping die driving the first punch to move towards the first coil by a predetermined distance in a first direction, so that the first coil is extruded to obtain a second coil;
[0008] S4, placing the second coil into a second stamping die, setting the temperature of the second stamping die to a second predetermined temperature, the second stamping die having a second punch, the second stamping die driving the second punch to move towards the second coil by a predetermined distance in the first direction, so that the first coil is extruded to obtain a finished coil.
[0009] In an embodiment, in the step S1, the coil blank comprises a conductive wire and an insulating wire, and the conductive wire and the insulating wire are arranged in a first direction.
[0010] In an embodiment, in the step S1, the material of the conductive wire is red copper.
[0011] In an embodiment, in the step S2, the coil embryo is wound around the first direction to form the first coil, and the first coil is arranged in a spring shape extending along the first direction.
[0012] In an embodiment, between the steps S3 and S4, the step S3 is repeated multiple times.
[0013] The application also provides a flat wire flat winding coil processing device, comprising: a first stamping die and a second stamping die; the first stamping die comprises a first limiting piece and a first punch, the first limiting piece has a first cavity opening to one side, the first cavity is used for accommodating a first coil, the first punch is inserted into the opening of the first cavity and can slide in the first cavity along the first direction; the second stamping die comprises a second limiting piece and a second punch, the second limiting piece has a second cavity opening to one side, the second cavity is used for accommodating a second coil, the second punch is inserted into the opening of the second cavity and can slide in the second cavity along the first direction.
[0014] In an embodiment, a first flange is arranged in the first cavity, the first flange is arranged along the first direction and is spaced apart from the inner wall of the first cavity, when the first coil is arranged in the first cavity, the first coil is arranged outside the periphery of the first flange; and / or, a second flange is arranged in the second cavity, the second flange is arranged along the first direction and is spaced apart from the inner wall of the second cavity, when the second coil is arranged in the second cavity, the second coil is arranged outside the periphery of the second flange.
[0015] In an embodiment, the first punch has a first top wall and a first outer ring arranged on one side of the first top wall, the first outer ring is arranged on the side of the first top wall close to the first cavity, the first outer ring is used to move in the first cavity along the first direction and stamp the first coil, the first outer ring forms a first avoiding slot for accommodating the first flange, and the first flange is slidably inserted into the first avoiding slot; and / or, the second punch has a second top wall and a second outer ring arranged on one side of the second top wall, the second outer ring is arranged on the side of the second top wall close to the second cavity, the second outer ring is used to move in the second cavity along the first direction and stamp the second coil, the second outer ring forms a second avoiding slot for accommodating the second flange, and the second flange is slidably inserted into the second avoiding slot.
[0016] In an embodiment, the first cavity has a first cross section extending along the first direction, the first cross section has a first region and a second region located on two sides of the first flange respectively, a bottom wall of the first region is lower than a bottom wall of the second region; and / or, the second cavity has a second cross section extending along the first direction, the second cross section has a third region and a fourth region located on two sides of the second flange respectively, a bottom wall of the third region is lower than a bottom wall of the fourth region.
[0017] In an embodiment, the first cavity has a shape matched with the first coil, the second cavity has a shape matched with the second coil, and the shape of the second cavity is larger than the shape of the first cavity.
[0018] The technical scheme of the present application forms a coil embryo by stacking the conductive wire and the insulating wire along the first direction, then winds the coil embryo into the first coil according to a preset mode, so that each turn of the first coil forms a coil structure in which the conductive wire and the insulating wire are alternately and stacked, then punches the first coil into the second coil by the first punching die, and punches the second coil into the finished coil by the second punching die, thereby gradually reducing the thickness of each turn of the coil in the process of punching, so as to form a flat-wound coil that meets the requirements. Since the coil embryo is wound into a coil, the coil is in a state of small width and thick thickness, and the corners of the coil are not easy to tear during winding. The punching method can further thin the flat-wound coil under the premise of ensuring that the flat-wound coil is not torn, so that the flat-wound coil is suitable for more small-size mechanical application scenarios. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without creative labor.
[0020] Figure 1 FIG. 1 is a schematic diagram of an embodiment of a flat-wound coil processing technology of the present application;
[0021] Figure 2 FIG. 2 is a structural schematic diagram of a first coil in an embodiment of the present application;
[0022] Figure 3 FIG. 3 is a side structural schematic diagram of the first coil in an embodiment of the present application;
[0023] Figure 4 FIG. 4 is a structural schematic diagram of a second coil in an embodiment of the present application; Figure 3a sectional view at A-A;
[0024] Figure 5 a structure schematic view of a finished coil in an embodiment of the present application;
[0025] Figure 6 a structure schematic view of a finished coil in an embodiment of the present application;
[0026] Figure 7 a structure schematic view of a first stamping die in an embodiment of the present application; Figure 6 a sectional view at B-B;
[0027] Figure 8 a structure schematic view of a first stamping die in an embodiment of the present application;
[0028] Figure 9 a structure schematic view of a second stamping die in an embodiment of the present application.
[0029] Brief Description of the Drawings:
[0030] 100, flat wire flat winding coil processing technology; 1, first coil; 2, second coil; 3, finished coil; 4, first stamping die; 41, first limiting piece; 411, first cavity; 411a, first area; 411b, second area; 412, first flange; 42, first punch; 421, first top wall; 422, first outer ring; 423, first avoiding groove; 5, second stamping die; 51, second limiting piece; 511, second cavity; 511a, third area; 511b, fourth area; 512, second flange; 52, second punch; 521, second top wall; 522, second outer ring; 523, second avoiding groove; 6, conductive wire; 7, insulating wire.
[0031] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION
[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.
[0033] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.
[0034] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.
[0035] The present application provides a flat wire flat winding coil processing technology 100.
[0036] Please refer to Figures 1 to 9 In an embodiment of the present application, the flat wire flat winding coil processing technology 100 comprises the following steps:
[0037] S1, providing a coil embryo;
[0038] S2, winding the coil embryo into a coil according to a preset mode to obtain a first coil 1;
[0039] S3, placing the first coil 1 into a first stamping die 4, setting the temperature of the first stamping die 4 as a first preset temperature, the first stamping die 4 has a first punch 42, the first stamping die 4 drives the first punch 42 to move towards the first coil 1 in a first direction by a preset distance, so that the first coil 1 is extruded to obtain a second coil 2;
[0040] S4, placing the second coil 2 into a second stamping die 5, setting the temperature of the second stamping die 5 as a second preset temperature, the second stamping die 5 has a second punch 52, the second stamping die 5 drives the second punch 52 to move towards the second coil 2 in a first direction by a preset distance, so that the first coil 1 is extruded to obtain a finished coil 3.
[0041] In this embodiment, the coil embryo is a conductive wire 6 with ductility, which can be formed into a desired shape under external force to be applied in a variety of different mechanical structures. The first coil 1 is arranged in a spring shape, and the spring-shaped first coil 1 has a first pivot around which the coil embryo is wound to obtain the first coil 1, and the first pivot is arranged to extend in a first direction. The first preset temperature and the second preset temperature are in a range below the material recrystallization temperature but sufficient to significantly reduce the material yield strength and improve the plasticity, the purpose is to promote the material to flow plastically under pressure and reduce the rebound and internal stress. The temperature of the stamping die is set to the preset temperature during stamping, which can make the coil reach the best ductility and plasticity at a certain temperature, so that the coil has better deformation ability and its edge is not easy to crack due to insufficient ductility when it is deformed by stamping. Since the second coil 2 is pressed by the first coil 1, the material of the second coil 2 does not change, so the first preset temperature is the same as the second preset temperature. The preset distance moved by the first stamping die 4 and the second stamping die 5 when stamping is determined by the final height of the finished coil 3.
[0042] In the present embodiment, first, a rectangular cross-section or circular cross-section conductive material that meets the specification requirements is prepared as a raw material into a coil embryo, and the coil embryo is usually selected from a high-purity copper or copper alloy wire. Subsequently, the coil embryo is wound into a preliminary coil structure according to the design parameters (such as the number of turns, the inner diameter, and the outer diameter) of the target coil, and the coil embryo is wound into a preliminary coil structure in a predetermined manner using a specific winding mold or clamp on a winding station, thereby forming a first coil 1 having a basic shape. At this time, it is necessary to ensure that the turns of the first coil 1 are tightly fitted without crossing or loosening. When winding the first coil 1, the winding path and tension control need to be pre-set to avoid cracks in the coil during initial winding. This step aims to obtain the basic geometric framework of the coil and lay the foundation for the subsequent hot pressing process. After obtaining the first coil 1, the first coil 1 is placed in the cavity of the dedicated first stamping die 4 and the positioning is ensured to be accurate. Then the first stamping die 4 is set to a first preset temperature, which is usually heated to the first preset temperature and maintained at this temperature for a certain time. After the first coil 1 is installed, the stamping program is started, and the first stamping die 4 drives the first punch 42 to apply pressure along the axial direction perpendicular to the pivot axis of the coil, i.e., the first direction, to extrude the coil. Step S3 can eliminate the winding gap of the coil, correct the large profile deviation, and obtain a second coil 2 with relatively stable size and regularized cross-section. The pre-set distance of the first punch 42 is the target compression amount of the first coil 1 in this step. The second coil 2 obtained after the first hot pressing shaping is taken out from the first stamping die 4; the second coil 2 is transferred and accurately positioned in the second stamping die 5. The second stamping die 5 has a higher precision cavity size, and the second stamping die 5 is heated and accurately controlled to a second preset temperature. This temperature can be the same as the first preset temperature, or it can be optimized and adjusted according to the material state and the final accuracy requirement, so that it can maintain the good plasticity of the material and minimize the influence of thermal deformation. After setting the second coil 2, the finishing stamping program is started, and the second stamping die 5 drives the second punch 52 to apply pressure along the first direction to ensure consistency with the first pressing direction and avoid introducing torsional stress; thereby the second coil 2 is finally size-calibrated, surface-pressed, and side edge perpendicularity-corrected to meet more stringent cross-sectional size tolerance requirements, and finally a finished coil 3 that meets all design specifications is obtained.
[0043] The technical scheme of the present application forms a coil embryo by stacking the conductive wire 6 and the insulating wire 7 in the first direction, then winds the coil embryo into the first coil 1 in a preset manner, so that the number of turns of each turn in the first coil 1 forms a coil structure in which the conductive wire 6 and the insulating wire 7 are alternately and stacked, then punches the first coil 1 into the second coil 2 by the first punching die 4, and punches the second coil 2 into the finished coil 3 by the second punching die 5, thereby gradually reducing the thickness of the number of turns of each turn in the process of punching, thereby forming a flat-wound coil that meets the requirements. Since the coil embryo is wound into a coil, the coil is in a state of small width and thick thickness, and the corners of the coil are not prone to tearing during winding. The punching method can further thin the thickness of the flat coil under the premise of ensuring that the flat coil is not torn, thereby making the flat coil suitable for more small-size mechanical application scenarios.
[0044] In an embodiment, in the step S1, the coil embryo includes the conductive wire 6 and the insulating wire 7, and the conductive wire 6 and the insulating wire 7 are stacked in the first direction. The coil embryo adopts a composite structure design to integrate the functions of conduction and insulation. The conductive wire 6 is responsible for carrying current, and the insulating wire 7 is used to provide reliable electrical isolation between turns or layers to avoid short circuiting of the coil during use. The coil embryo is arranged in the first direction and tightly adheres to each other to ensure that the subsequent hot stamping shaping process can uniformly apply force to the coil and accurately control the final geometric size and cross-sectional shape of the coil.
[0045] In an embodiment, in the step S1, the material of the conductive wire 6 is red copper. The conductive wire 6 is made of high-purity red copper to have good thermal conductivity and ductility, so that the coil has the required bending stiffness during winding and the ductility required for high-pressure plastic deformation in the hot stamping process. The insulating wire 7 is made of polyimide, polytetrafluoroethylene, or other insulating wires with good ductility.
[0046] In an embodiment, in the step S2, the coil embryo is wound into the first coil 1 around the first direction, and the first coil 1 is arranged in a spring shape extending in the first direction. The first coil 1 has a first pivot extending in the first direction, and the coil embryo is wound into a spring-shaped first coil 1 around the first pivot, wherein the turns of the first coil 1 are tightly adhered without crossing or loosening during winding. The winding path and tension control need to be controlled according to the preset winding path and tension control to avoid cracks in the coil during initial winding. This step aims to obtain the basic geometric framework of the coil and lay the foundation for the subsequent hot pressing process.
[0047] In an embodiment, a step of repeating the step S3 multiple times is further included between the steps S3 and S4. The first coil 1 is punched multiple times, and the distance of each punch is controlled to punch the first coil 1 by small distances one after another, so as to avoid cracks at the bent part of the coil caused by punching too much at one time, and to improve the qualified rate of the finished coil 3.
[0048] With reference to Figures 8 to 9 The present application also provides a flat wire flat-wound coil processing device, which comprises a first punch die 4 and a second punch die 5, and is applied to part of the steps in the flat wire flat-wound coil processing process 100. The flat wire flat-wound coil processing device comprises the first punch die 4 and the second punch die 5. The first punch die 4 comprises a first limiting piece 41 and a first punch 42. The first limiting piece 41 has a first cavity 411 which is open to one side and is used to accommodate the first coil 1. The first punch 42 is inserted into the opening of the first cavity 411 and can slide in the first cavity 411 along a first direction. The second punch die 5 comprises a second limiting piece 51 and a second punch 52. The second limiting piece 51 has a second cavity 511 which is open to one side and is used to accommodate the second coil 2. The second punch 52 is inserted into the opening of the second cavity 511 and can slide in the second cavity 511 along the first direction. The first punch die 4 is used to punch and heat-press the first coil 1 into the second coil 2 in the step S3 of the flat wire flat-wound coil processing process 100. The second punch die 5 is used to punch the second coil 2 into the finished coil 3 in the step S4 of the flat wire flat-wound coil processing process 100.
[0049] In an embodiment, the first cavity 411 is provided with a first flange 412 extending in the first direction and spaced apart from the inner wall of the first cavity 411, and when the first coil 1 is arranged in the first cavity 411, the first coil 1 is sleeved around the periphery of the first flange 412; and / or the second cavity 511 is provided with a second flange 512 extending in the first direction and spaced apart from the inner wall of the second cavity 511, and when the second coil 2 is arranged in the second cavity 511, the second coil 2 is sleeved around the periphery of the second flange 512. The first flange 412 is used to limit the first coil 1 arranged in the first cavity 411, and the outer contour of the first flange 412 can match the shape of the first coil 1, so that when the first coil 1 is sleeved around the periphery of the first flange 412, the first coil 1 can be positioned in the first cavity 411 without loosening, and the first flange 412 can support the first coil 1 when the first punch 42 punches the first coil 1, so as to avoid the first coil 1 from being deformed due to deviation from the first direction and tilting during punching. The second stamping die 5 and the first stamping die 4 are the same, and the second flange 512 can limit and support the second coil 2, and details are not described herein.
[0050] In an embodiment, the first punch 42 has a first top wall 421 and a first outer ring 422 arranged on one side of the first top wall 421, the first outer ring 422 is arranged on the side of the first top wall 421 close to the first cavity 411, the first outer ring 422 is used to move in the first cavity 411 in the first direction and stamp the first coil 1, the first outer ring 422 encloses a first avoiding groove 423 for accommodating the first flange 412, and the first flange 412 is slidably inserted into the first avoiding groove 423; and / or, the second punch 52 has a second top wall 521 and a second outer ring 522 arranged on one side of the second top wall 521, the second outer ring 522 is arranged on the side of the second top wall 521 close to the second cavity 511, the second outer ring 522 is used to move in the second cavity 511 in the first direction and stamp the second coil 2, the second outer ring 522 encloses a second avoiding groove 523 for accommodating the second flange 512, and the second flange 512 is slidably inserted into the second avoiding groove 523. The first outer ring 422 is arranged on the side of the first top wall 421 close to the first cavity 411, the outer contour of the first outer ring 422 has a shape matched with the inner contour of the first cavity 411, so that the first outer ring 422 is not easy to deviate from the preset path when moving in the first cavity 411 in the first direction, the inner contour of the first avoiding groove 423 has a shape matched with the outer contour of the first flange 412, so that the first flange 412 can slide in the first avoiding groove 423 and is not easy to deviate, thereby further ensuring that the first punch 42 is not easy to deviate from the preset path when stamping, so as to ensure the stamping effect of the first stamping die 4 on the coil. The second stamping die 5 is the same as the first stamping die 4, and can improve the stamping effect on the second coil 2 through its own structure, so as to obtain a finished coil 3 with higher quality.
[0051] In an embodiment, the first cavity 411 has a first cross section extending along the first direction, the first cross section has a first area 411a and a second area 411b located on both sides of the first flange 412 respectively, the bottom wall of the first area 411a is lower than that of the second area 411b; and / or, the second cavity 511 has a second cross section extending along the first direction, the second cross section has a third area 511a and a fourth area 511b located on both sides of the second flange 512 respectively, the bottom wall of the third area 511a is lower than that of the fourth area 511b. In the first cross section, the bottom wall of the first area 411a is lower than that of the second area 411b, an asymmetric layout is adopted, and the first cavity 411 is thus arranged so that the bottom wall of the first cavity 411 can better match the first coil 1 arranged in a spring-shaped spiral. Since the coil arranged in a spring shape has a non-planar bottom wall, the end of the spring coil is arranged in the first area 411a with a lower bottom wall, so that the first coil 1 can maintain an extended state along the first direction during stamping, avoiding force imbalance and skewing to cause deformation of the final product coil 3, reduce the yield rate. The second stamping die 5 and the first stamping die 4 have the same effect of improving the yield rate of the final product coil 3 by having a height difference in the bottom wall.
[0052] In an embodiment, the first cavity 411 has a shape matching the first coil 1, the second cavity 511 has a shape matching the second coil 2, and the size of the shape of the second cavity 511 is greater than that of the first cavity 411. Since the second coil 2 is obtained after the first cavity 411 is stamped and formed, and the final product coil 3 is obtained after the second coil 2 is stamped and formed, the width of the final product coil 3 is greater than that of the second coil 2 and that of the first coil 1. Therefore, the size of the second cavity 511 is greater than that of the first cavity 411 to obtain a final product coil 3 with a greater width and a thinner thickness, so that the final product coil 3 can be used in small-sized mechanical equipment.
[0053] The above description is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made according to the technical concept of the present application, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.
Claims
1. A flat wire flat coil processing process, characterized in that: The flat wire flat coil processing process comprises the following steps: S1. Provide a coil embryo; S2. Winding the coil embryo into a coil in a preset manner to obtain a first coil; S3. placing the first coil into a first stamping die, setting the temperature of the first stamping die to a first preset temperature, wherein the first stamping die has a first punch, and the first stamping die drives the first punch to move a preset distance along a first direction toward the first coil, so that the first coil is squeezed to obtain a second coil; S4. Place the second coil into a second stamping die, set the temperature of the second stamping die to a second preset temperature, the second stamping die has a second punch, and the second stamping die drives the second punch to move a preset distance along a first direction toward the second coil so that the first coil is squeezed to obtain a finished coil.
2. The flat wire coil processing process according to claim 1, characterized in that: In the step S1 , the coil embryo includes a conductive wire and an insulating wire, and the conductive wire and the insulating wire are stacked along a first direction.
3. The flat wire coil processing process according to claim 2, characterized in that: In the step S1, the conductive wire is made of copper.
4. The flat wire flat coil processing process according to claim 1, characterized in that: In the step S2, the coil embryo is wound around the first direction to form the first coil, and the first coil is arranged in a spring shape extending along the first direction.
5. The flat-wire coil processing process according to any one of claims 1 to 4, characterized in that: The following step is also included between step S3 and step S4: repeating step S3 multiple times.
6. A flat wire flat coil processing device, characterized in that: include: A first stamping die includes a first stopper and a first punch, wherein the first stopper has a first cavity open to one side, the first cavity is used to accommodate the first coil, and the first punch is inserted into the opening of the first cavity and is capable of sliding in a first direction within the first cavity; as well as The second stamping die includes a second limiter and a second punch. The second limiter has a second cavity opening toward one side. The second cavity is used to accommodate the second coil. The second punch is inserted into the opening of the second cavity and can slide in the second cavity along the first direction.
7. The flat-wire coil processing device according to claim 6, wherein: A first flange is provided in the first cavity, extending along a first direction and spaced apart from an inner wall of the first cavity. When the first coil is provided in the first cavity, the first coil is sleeved around the periphery of the first flange. And / or, a second flange is provided in the second cavity, the second flange extends along the first direction and is spaced apart from the inner wall of the second cavity, and when the second coil is provided in the second cavity, the second coil is sleeved on the outer periphery of the second flange.
8. The flat-wire coil processing device according to claim 7, wherein: The first punch has a first top wall and a first outer ring provided on one side of the first top wall. The first outer ring is provided on a side of the first top wall close to the first cavity. The first outer ring is used to move in a first direction in the first cavity and punch the first coil. The first outer ring encloses a first avoidance groove for accommodating the first flange. The first flange is slidably inserted into the first avoidance groove. And / or, the second punch has a second top wall and a second outer ring arranged on one side of the second top wall, the second outer ring is arranged on the side of the second top wall close to the second cavity, the second outer ring is used to move along the first direction in the second cavity and punch the second coil, the second outer ring encloses a second avoidance groove for accommodating the second flange, and the second flange can be slidably inserted in the second avoidance groove.
9. The flat-wire coil processing device according to claim 7, wherein: The first cavity has a first cross-section extending along the first direction, the first cross-section having a first area and a second area respectively located on both sides of the first flange, and a bottom wall of the first area is lower than a bottom wall of the second area; And / or, the second cavity has a second cross-section, the second cross-section extends along the first direction, the second cross-section has a third area and a fourth area respectively located on both sides of the second flange, and the bottom wall of the third area is lower than the bottom wall of the fourth area.
10. The flat-wire coil processing device according to claim 8, wherein: The first cavity has a shape that matches the first coil, the second cavity has a shape that matches the second coil, and the shape and size of the second cavity are larger than the shape and size of the first cavity.