Riveting-point-free iron core and lossless separation process thereof

Abstract

The invention relates to the technical field of iron core production, in particular to a riveting-point-free iron core and a lossless separation process thereof.The riveting-point-free iron core and the lossless separation process thereof.The riveting-point-free iron core comprises the following steps that the position of a silicon steel sheet is pre-determined on a steel belt with a self-adhesive coating; stamping the outer sides of the silicon steel sheets to form the silicon steel sheets and two frames; performing semi-shearing stamping on the joints between the silicon steel sheets and the frame to enable the silicon steel sheets to be punched out of the frame by a certain distance; shaping to enable the silicon steel sheet and the frame to be in the same plane; then the steel belt is cut off, so that the silicon steel sheets and the frame form independent sheet bodies; then the multiple sheet bodies are stacked together, self-buckling points are punched on the frame, and the sheet bodies are stacked and riveted into a whole through the buckling points; the plurality of silicon steel sheets are fixed together by melting and then cooling the self-adhesive coating; fixing the silicon steel sheet, and separating the frame from the silicon steel sheet through a separation tool to obtain an iron core unit; the multiple iron core units are arranged in the circumferential direction, and the adjacent iron core units are connected in a clamped mode to form a complete iron core.

Description

Technical Field

[0001] The invention relates to the technical field of iron core production, and in particular to an iron core without rivet points and a lossless separation process thereof. Background Art

[0002] Usually, the connection methods of core products are self-fastening points, welding, rivets, glue bonding, etc. Among them, the self-fastening points and rivets methods destroy the integrity of the product design, thus affecting the performance of the product. Although the welding method does not destroy the integrity of the product, it is generally welded after the single piece is assembled. The product quality is subject to the accuracy of the piece sorting tooling and the efficiency is low. The glue method also ensures the integrity of the product, but because the glue process itself is not mature and the unit price is expensive, it is not suitable for long-term mass production. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in order to solve the technical problems in the prior art, the present invention provides a rivet-free iron core and a non-destructive separation process thereof.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a rivet-free iron core and a non-destructive separation process thereof, comprising the following steps: S1. Use a steel strip with a self-adhesive coating and pre-determine the position of the silicon steel sheet on the steel strip; S2. Punching is performed on the outer side of the silicon steel sheet to remove part of the waste material, so that part of the outer contour of the silicon steel sheet is exposed, and the remaining waste material on the steel strip is formed into two outer frames connecting the silicon steel sheets, and the two outer frames are located on both sides of the silicon steel sheet; S3, perform half-shear punching on the connection between the silicon steel sheet and the outer frame, so that the silicon steel sheet is punched out of the outer frame by a certain distance; S4, shaping to make the silicon steel sheet and the outer frame in the same plane; S5, cutting the steel strip so that the silicon steel sheet and the outer frame form a separate sheet; S6, stacking multiple sheets together, punching out self-fastening points on the outer frame, and riveting them into a whole through the fastening points; S7, heating the multiple sheets to melt the self-adhesive coating, connecting adjacent silicon steel sheets through the melted self-adhesive coating material, and then cooling the sheets to solidify the self-adhesive coating, thereby finally connecting the silicon steel sheets into one; S8, fixing the silicon steel sheets, and separating the outer frame from the silicon steel sheets by a separation tool to obtain an iron core unit; S9, arranging a plurality of core sub-units along the circumferential direction, and clamping adjacent core sub-units together to form a complete core.

[0005] The present invention discloses a rivet-free iron core and a non-destructive separation process thereof, wherein a plurality of silicon steel sheets are fixed as a whole by first melting and then cooling a self-adhesive coating, and then the silicon steel sheets are separated from an outer frame by a separation tool to obtain an iron core unit, thereby reducing the possibility of damage to the iron core unit.

[0006] Furthermore, a separation groove is provided between the two outer frames, and the silicon steel sheet includes a connecting portion and a separating portion which are connected to each other, and the connecting portion is connected to the two outer frames at the same time.

[0007] Furthermore, the separation tooling includes a template, a positioning piece and a separation piece. The positioning piece is arranged on the template and is suitable for positioning the silicon steel sheet and the outer frame. The separation piece is suitable for being inserted into the separation groove to separate the outer frame from the silicon steel sheet.

[0008] Through the above technical solution, the two outer frames are separated from the silicon steel sheets by inserting the separation piece into the separation groove, which can reduce the possibility of deformation or damage of the silicon steel sheets and achieve lossless separation.

[0009] Furthermore, the template includes a base plate and a separation positioning plate, the positioning member is installed on the base plate, and the separation member is installed on the separation positioning plate; a guide column is connected to the base plate, and when the base plate and the separation positioning plate are closed, the separation positioning plate is passed through by the guide column.

[0010] Through the above technical solution, the separation positioning plate is guided and limited by the guide column, so as to improve the stability of the movement of the separation member, thereby ensuring the stability of the separation between the outer frame and the silicon steel sheet.

[0011] Furthermore, a first positioning groove is provided between the two outer frames and the silicon steel sheet, and the separation groove is located at an end of the connecting part away from the separation part; the positioning member includes a first positioning block, the first positioning block is inserted into the first positioning groove, and the first positioning block is provided with a limiting groove for inserting the separation part; the separation member includes a first separation block, and the first separation block is suitable for inserting into the separation groove to separate the two outer frames from the connecting part.

[0012] Through the above technical solution, the limiting groove cooperates with the separation part, and the silicon steel sheet is positioned by the first positioning member, so that the first separation block is inserted into the separation groove to separate the two outer frames from the connecting part.

[0013] Furthermore, the first separation block includes a fixing part and a working part connected to each other, the working part is suitable for being inserted into the separation groove, and two avoidance slopes are provided at one end of the fixing part facing the working part, and the distance between the avoidance slope and the working part away from one end of the fixing part gradually increases along the direction from the middle of the fixing part to the edge.

[0014] Furthermore, each of the silicon steel sheets is provided with two separation grooves, and the separation grooves are located between the outer frame and the separation part; the positioning member includes four second positioning blocks, and a positioning area for preventing the silicon steel sheet and the outer frame from being separated is formed between the four second positioning blocks; the separation member includes two second separation blocks, and each of the second separation blocks is suitable for being inserted into a corresponding separation groove to separate the two outer frames from the connecting part.

[0015] Through the above technical solution, the outer frame is positioned by four second positioning blocks, so that the two second separation blocks can be inserted into the corresponding separation grooves, and then the two outer frames are separated from the connecting parts respectively by the two second separation blocks.

[0016] Furthermore, the second positioning block is L-shaped.

[0017] Furthermore, the second separation block is adapted to the inner side wall of the outer frame.

[0018] Furthermore, in step S8, when the outer frame is separated from the silicon steel sheet by the separation tool, the silicon steel sheet and the outer frame are first placed on the bottom plate and positioned by the positioning piece, and then the separation positioning plate and the bottom plate are closed to allow the separation piece to separate the outer frame from the silicon steel sheet.

[0019] A rivet-free iron core, characterized in that it is produced by the above-mentioned rivet-free iron core lossless separation process.

[0020] The beneficial effects of the present invention are: 1. First, the self-adhesive coating is melted and then cooled to fix multiple silicon steel sheets as a whole, and then the silicon steel sheets and the outer frame are positioned by the positioning parts, and then the two outer frames are separated from the silicon steel sheets by the separation parts to obtain the iron core unit, thereby reducing the possibility of damage to the iron core unit; 2. The limiting groove cooperates with the separation part, and the silicon steel sheet is positioned by the first positioning member, so that the first separation block is inserted into the separation groove, so that the two outer frames are separated from the connection part; 3. The outer frame is positioned by four second positioning blocks so that the two second separation blocks can be inserted into the corresponding separation grooves, and then the two outer frames are separated from the connecting parts by the two second separation blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 The present invention is a schematic diagram of the overall process of a rivet-free iron core and a lossless separation process thereof.

[0023] Figure 2 It is a schematic diagram showing the cross section of a silicon steel sheet in the present invention.

[0024] Figure 3It is a structural schematic diagram showing the connection between the outer frame and the silicon steel sheet in the first embodiment of the present invention.

[0025] Figure 4 It is a schematic diagram of the structure of the outer frame in the first embodiment of the present invention.

[0026] Figure 5 It is a schematic structural diagram of the entire separation tooling in the first embodiment of the present invention.

[0027] Figure 6 It is a schematic diagram showing the working conditions of the first separation block and the first positioning block in the first embodiment of the present invention.

[0028] Figure 7 It is a structural schematic diagram of the first positioning block in the first embodiment of the present invention.

[0029] Figure 8 It is a schematic diagram of the structure of the first separation block in the first embodiment of the present invention.

[0030] Fig. 9 It is a structural schematic diagram showing the connection between the outer frame and the silicon steel sheet in the second embodiment of the present invention.

[0031] Fig.10 It is a schematic diagram of the structure of the entire separation tooling in the second embodiment of the present invention.

[0032] Fig.11 It is a schematic diagram showing the working conditions of the second separation block and the second positioning block in the second embodiment of the present invention.

[0033] Fig.12 It is a structural schematic diagram of the second separation block in the second embodiment of the present invention.

[0034] In the figure: 1, outer frame; 11, separation groove; 12, first connecting surface; 13, second connecting surface; 14, first convex part; 15, first concave part; 16, buckle point; 2, silicon steel sheet; 21, connecting part; 22, separation part; 23, first clamping surface; 24, second clamping surface; 25, second concave part; 26, second convex part; 31, template; 311, bottom plate; 312, separation positioning plate; 313, guide column; 321, first positioning block; 3211, limiting groove; 323, second positioning block; 331, first separation block; 3311, fixing part; 3312, working part; 332, second separation block. DETAILED DESCRIPTION

[0035] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The invention discloses a rivet-free iron core and a lossless separation process thereof.

[0038] Reference Figure 1 , a rivet-free iron core and a non-destructive separation process thereof, comprising the following steps: S1. Use a steel strip with a self-adhesive coating and predetermine the position of the silicon steel sheet 2 on the steel strip; the strip can be made of steel from Shanghai Baosteel, and the model can be B25A230Z, B35A300Z, B20, etc.

[0039] S2, punching is performed on the outer side of the silicon steel sheet 2 to remove part of the waste material, so that a part of the outer contour of the silicon steel sheet 2 is exposed, and the remaining waste material on the steel strip is formed into two outer frames 1 connecting the silicon steel sheet 2, and the two outer frames 1 are located on both sides of the silicon steel sheet 2; S3, performing half-shear punching on the connection between the silicon steel sheet 2 and the outer frame 1, so that the silicon steel sheet 2 is punched out of the outer frame 1 by a certain distance; S4, shaping so that the silicon steel sheet 2 and the outer frame 1 are in the same plane; S5, cutting the steel strip so that the silicon steel sheet 2 and the outer frame 1 form a separate sheet; S6, stacking the multiple sheets together, punching out self-fastening points 16 on the outer frame 1, and riveting them into a whole through the fastening points 16; S7. Heat the multiple sheets to melt the self-adhesive coating, connect the adjacent silicon steel sheets 2 through the melted self-adhesive coating material, and then cool the sheets to solidify the self-adhesive coating, and finally connect the silicon steel sheets 2 into one. During heating, the sheets are heated and cooled by the subsequent equipment, and the multiple sheets stacked together are first placed in an environment of 180-220 degrees Celsius, and the multiple sheets stacked together are placed in a compressed state. After maintaining for one cycle, the sheets are placed in an environment of 0 degrees Celsius, and maintained in a compressed state for another cycle. One cycle is 1-3 minutes, and in this embodiment it is 1 minute. Keeping the multiple sheets in a compressed state during heating and cooling facilitates the control of the positioning tolerance of the product during the curing process; S8, fixing the silicon steel sheet 2, and separating the outer frame 1 from the silicon steel sheet 2 by a separation tool to obtain an iron core unit; S9, arranging a plurality of core sub-units along the circumferential direction, and clamping adjacent core sub-units together to form a complete core.

[0040] Embodiment 1: Reference Figures 2 to 8 A separation groove 11 is provided between the two outer frames 1 , and the silicon steel sheet 2 includes an integrally formed connecting portion 21 and a separating portion 22 , and the connecting portion 21 is connected to the two outer frames 1 at the same time.

[0041] The separation tooling includes a template 31, a positioning member and a separation member. The positioning member is arranged on the template 31 and is suitable for positioning the silicon steel sheet 2 and the outer frame 1. The separation member is suitable for being inserted into the separation groove 11 to separate the outer frame 1 from the silicon steel sheet 2. The template 31 includes a bottom plate 311 and a separation positioning plate 312. The positioning member is mounted on the bottom plate 311, and the separation member is mounted on the separation positioning plate 312. The bottom plate 311 is connected with a guide column 313. When the bottom plate 311 and the separation positioning plate 312 are closed, the separation positioning plate 312 is passed through by the guide column 313.

[0042] In step S8, when the outer frame 1 and the silicon steel sheet 2 are separated by the separation tool, the silicon steel sheet 2 and the outer frame 1 are first placed on the bottom plate 311 and positioned by the positioning piece, and then the separation positioning plate 312 and the bottom plate 311 are closed to allow the separation piece to separate the outer frame 1 and the silicon steel sheet 2.

[0043] Each outer frame 1 is provided with a first connection surface 12 and a second connection surface 13, and the connection portion 21 is provided with a first clamping surface 23 matched with the first connection surface 12 and a second clamping surface 24 matched with the second connection surface 13. The first connection surface 12 and the second connection surface 13 are arranged obliquely, that is, the connection between the outer frame 1 and the silicon steel sheet 2 is not only in one direction, thereby improving the connection strength between the outer frame 1 and the silicon steel sheet 2, so as to adapt to thinner silicon steel sheets 2. Because the silicon steel sheet 2 and the outer frame 1 need to be half-shear stamped, if the outer frame 1 and the silicon steel sheet 2 are only combined on the surface in one direction, the combination strength is limited, and during the half-shear stamping, the thinner silicon steel sheet 2 may be directly separated from the outer frame 1.

[0044] The second connecting surface 13 is provided with a first convex portion 14 and a first concave portion 15, the second clamping surface 24 is provided with a second concave portion 25 matched with the first convex portion 14, and the second clamping surface 24 is further provided with a second convex portion 26 matched with the first concave portion 15. Through the cooperation between the first convex portion 14 and the second concave portion 25, and the cooperation between the second convex portion 26 and the first concave portion 15, the connection strength between the silicon steel sheet 2 and the outer frame 1 is further improved, and thin material processing is further adapted.

[0045] Another advantage of adopting this structure for the outer frame 1 is that the shape of the inner part of the outer frame 1 can be changed while the outer shape of the outer frame 1 can remain unchanged, thereby allowing a set of molds to adapt to different products, improving the versatility of the molds and reducing costs.

[0046] A first positioning groove is provided between the two outer frames 1 and the silicon steel sheet 2, and the first positioning groove is concave. One separation groove 11 is provided, and is located at one end of the connecting portion 21 away from the separating portion 22. The positioning member includes a first positioning block 321, the first positioning block 321 is inserted into the first positioning groove, and the first positioning block 321 is provided with a limiting groove 3211 for the separating portion 22 to be inserted, and the separating portion 22 is adapted to the limiting groove 3211. The separating member includes a first separating block 331, and the first separating block 331 is used to be inserted into the separating groove 11 to separate the two outer frames 1 from the connecting portion 21. The first separation block 331 includes an integrally formed fixed portion 3311 and a working portion 3312, the working portion 3312 is suitable for inserting into the separation groove 11, the fixed portion 3311 is fixedly connected to the separation positioning plate 312, and the fixed portion 3311 is provided with two avoidance slopes at one end facing the working portion 3312, and the distance between the avoidance slope and the working portion 3312 away from one end of the fixed portion 3311 gradually increases along the direction from the middle of the fixed portion 3311 to the edge, so as to avoid interference when separating the two outer frames 1. The width of the working portion 3312 is slightly larger than the width of the separation groove 11, so that when the separation groove 11 is inserted, the outer frame 1 is separated from the silicon steel sheet 2. The bottom of the working portion 3312 is integrally formed with a first guide cone, and the width of the small end of the first guide cone is smaller than the width of the separation groove 11, so that it can be inserted into the separation groove 11.

[0047] When the outer frame 1 is separated from the silicon steel sheet 2 by the separation tool, the integrated silicon steel sheet 2 and the outer frame 1 are first placed on the bottom plate 311, and the separation portion 22 is inserted into the limiting groove 3211, and then the separation positioning plate 312 and the bottom plate 311 are closed, so that the working portion 3312 is inserted into the separation groove 11, so that the two outer frames 1 are rotated away from each other and separated from the silicon steel sheet 2. Compared with the method of separating by moving the two outer frames 1 away from each other, separating the silicon steel sheet 2 from the outer frame 1 by rotating can facilitate the separation between the first recess 15 and the second protrusion 26, and between the second recess 25 and the first protrusion 14.

[0048] Embodiment 2: Reference Figures 9 to 12 , which is different from Example 1 in that each silicon steel sheet 2 has two separation grooves 11, and the separation grooves 11 are located between each outer frame 1 and the separation portion 22. Multiple silicon steel sheets 2 can be arranged between every two outer frames 1, and the multiple silicon steel sheets 2 are arranged along the length direction of the outer frame 1. In this embodiment, the number of silicon steel sheets 2 is 3. In other embodiments, the number of outer frames 1 can be increased along the width direction of the outer frame 1, and a group of silicon steel sheets 2 is provided between two adjacent outer frames 1, but it is easier to control the accuracy when only two outer frames 1 are used.

[0049] The positioning member includes four second positioning blocks 323, and a positioning area for preventing the silicon steel sheet 2 and the outer frame 1 is formed between the four second positioning blocks 323. The second positioning blocks 323 are L-shaped so as to position the outer frame 1 and the silicon steel sheet 2 as a whole. The separation member includes two second separation blocks 332, and each second separation block 332 is suitable for inserting into a corresponding separation groove 11 so as to separate the two outer frames 1 from the connecting portion 21. The second separation block 332 is adapted to the inner side wall of the outer frame 1. A gap is left between the outer frame 1 and the second positioning block 323 along the connecting direction of the two second separation blocks 332 so as to separate the two outer frames 1 from the silicon steel sheet 2. At the same time, the second positioning block 323 is also convenient for limiting the separated outer frame 1, so as to collect the separated outer frame 1. The bottom of the second separation block 332 is integrally formed with a second guide cone, and the width of the small end of the second guide cone is smaller than the width of the separation groove 11 so as to be able to insert the separation groove 11.

[0050] When the outer frame 1 is separated from the silicon steel sheet 2 by the separation tool, the integrated silicon steel sheet 2 and the outer frame 1 are first placed on the bottom plate 311, and the two outer frames 1 are located between the four second positioning blocks 323, and then the separation positioning plate 312 and the bottom plate 311 are closed, so that the second separation blocks 332 are inserted into the separation groove 11, so that the two outer frames 1 move back to back and are separated from the silicon steel sheet 2. Compared with the method of separating by moving the two outer frames 1 back to back, the second positioning blocks 323 are also convenient for blocking the separated outer frame 1 to prevent the outer frame 1 from falling into other positions of the mold.

[0051] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A non-destructive separation process for a core without rivets, characterized in that: The steps include: S1. Using a steel strip with a self-adhesive coating, the position of the silicon steel sheet (2) is pre-determined on the steel strip; S2, punching the outer side of the silicon steel sheet (2) to remove part of the waste material, so that part of the outer contour of the silicon steel sheet (2) is exposed, and the remaining waste material on the steel strip is formed into two outer frames connecting the silicon steel sheet (2), and the two outer frames are located on both sides of the silicon steel sheet (2); S3, performing half-shear punching on the connection between the silicon steel sheet (2) and the outer frame, so that the silicon steel sheet (2) is punched out of the outer frame by a certain distance; S4, shaping so that the silicon steel sheet (2) and the outer frame are in the same plane; S5, cutting the steel strip so that the silicon steel sheet (2) and the outer frame form a separate sheet; S6, stacking the multiple sheets together, punching out self-fastening points (16) on the outer frame, and riveting them together into a whole through the fastening points (16); S7, heating the plurality of sheets to melt the self-adhesive coating, connecting adjacent silicon steel sheets (2) through the melted self-adhesive coating material, and then cooling the sheets to solidify the self-adhesive coating, thereby finally connecting the silicon steel sheets (2) into one body; S8, fixing the silicon steel sheet (2), and separating the outer frame from the silicon steel sheet (2) by a separation tool, so as to obtain an iron core unit; A separation groove (11) is provided between the two outer frames (1); the silicon steel sheet (2) comprises a connecting portion (21) and a separating portion (22) which are connected to each other; the connecting portion (21) is connected to the two outer frames (1) at the same time; The separation tool comprises a template (31), a positioning piece and a separation piece, wherein the positioning piece is arranged on the template (31) and is suitable for positioning the silicon steel sheet (2) and the outer frame (1), and the separation piece is suitable for being inserted into the separation groove (11) to separate the outer frame (1) from the silicon steel sheet (2); The template (31) comprises a bottom plate (311) and a separation positioning plate (312), the positioning member is mounted on the bottom plate (311), and the separation member is mounted on the separation positioning plate (312); The bottom plate (311) is connected to a guide post (313); when the bottom plate (311) and the separation positioning plate (312) are closed, the separation positioning plate (312) is penetrated by the guide post (313); When the frame and the silicon steel sheet (2) are separated by the separation tool, the silicon steel sheet (2) and the frame are first placed on the bottom plate (311) and positioned by the positioning piece, and then the separation positioning plate (312) and the bottom plate (311) are closed together so that the separation piece separates the outer frame (1) and the silicon steel sheet (2); S9, arranging a plurality of core sub-units along the circumferential direction, and clamping adjacent core sub-units together to form a complete core.

2. The non-destructive separation process for the rivet-free core according to claim 1, characterized in that: A first positioning groove is provided between the two outer frames (1) and the silicon steel sheet (2), and the separation groove (11) is located at an end of the connecting portion (21) away from the separation portion (22); The positioning member comprises a first positioning block (321), the first positioning block (321) is inserted into a first positioning groove, and the first positioning block (321) is provided with a limiting groove (3211) for the separation part (22) to be inserted; The separation member comprises a first separation block (331), wherein the first separation block (331) is suitable for being inserted into the separation groove (11) so as to separate the two outer frames (1) from the connecting portion (21).

3. The non-destructive separation process for the rivet-free core according to claim 2, characterized in that: The first separation block (331) comprises a fixing portion (3311) and a working portion (3312) which are connected to each other, wherein the working portion (3312) is suitable for being inserted into the separation groove (11), and two avoidance slopes are provided at one end of the fixing portion (3311) facing the working portion (3312), and the distance between the avoidance slopes and the end of the working portion (3312) away from the fixing portion (3311) gradually increases along the direction from the middle of the fixing portion (3311) to the edge.

4. The non-destructive separation process for rivet-free core according to claim 1, characterized in that: Each of the silicon steel sheets (2) is correspondingly provided with two separation grooves (11), and the separation grooves (11) are located between the outer frame (1) and the separation portion (22); The positioning member comprises four second positioning blocks (323), and a positioning area for preventing the silicon steel sheet (2) and the outer frame (1) from being formed between the four second positioning blocks (323); The separation component comprises two second separation blocks (332), each of the second separation blocks (332) being suitable for being inserted into a corresponding separation groove (11) so as to separate the two outer frames (1) from the connecting portion (21).

5. The non-destructive separation process for the rivet-free core according to claim 4, characterized in that: The second positioning block (323) is L-shaped, and the second separation block (332) is adapted to the inner side wall of the outer frame (1).

6. A rivet-free core, characterized in that: The method is produced by the non-destructive separation process of the rivet-free core according to any one of claims 1 to 5.

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