Stamping die for riveting-point-free iron core

Abstract

The utility model discloses a stamping die for a riveting-point-free iron core, which comprises an upper die holder and a lower die holder, the upper die holder and the lower die holder are oppositely arranged, a material belt moves between the upper die holder and the lower die holder, a male die is formed on the upper die holder, a female die matched with the male die is formed on the lower die holder, and the upper die holder and the lower die holder are oppositely arranged. The upper die base and the lower die base are sequentially provided with an appearance stamping area, a half cutting area, a shaping area, a buckling point stamping area and a blanking area in the moving direction of a material belt, the appearance stamping area is used for removing part of waste on the outer side of a silicon steel sheet and exposing part of the outer contour of the silicon steel sheet, and the half cutting area is used for stamping the silicon steel sheet out of the material belt by a certain distance; the shaping area is used for shaping a silicon steel sheet and a frame body, the buckling point punching area is used for punching buckling points on the frame body, the blanking area is used for cutting off a material strap, and the iron core has the advantages that the buckling points are prevented from being formed on the silicon steel sheet, and the performance of the iron core is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of silicon steel sheet stamping, and in particular relates to a stamping die for a rivet-free iron core. Background Art

[0002] The iron core is the central part of the motor, which is composed of multiple stamped silicon steel sheets. The stacking process of multiple silicon steel sheets usually uses the process of stamping silicon steel sheets, punching buckle points on the silicon steel sheets, and then stacking multiple silicon steel sheets and pressing them together to connect multiple silicon steel sheets through the buckle points. However, the punching of the buckle points will damage the silicon steel sheets, causing iron loss and reducing the performance of the motor. In order to improve the performance of the motor, the glue-coating method is now mostly used to manufacture the rivet-free iron core, but the current glue-coating process is not mature, and it is easy to cause glue overflow or weak adhesion. At the same time, the glue-coating method is costly. In order to solve such problems, a stamping die for the rivet-free iron core is proposed. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art.

[0004] To this end, the utility model proposes a stamping die for a rivet-free iron core, which has the advantages of avoiding buckle points from being formed on silicon steel sheets and improving the performance of the iron core.

[0005] According to the embodiment of the utility model, the stamping die for the rivet-free iron core comprises: an upper die seat and a lower die seat, the upper die seat and the lower die seat are arranged opposite to each other, the material strip moves between the upper die seat and the lower die seat, a punch is formed on the upper die seat, a concave die matching the punch is formed on the lower die seat, and the upper die seat and the lower die seat are provided with an outer shape stamping area, a half-cutting area, a shaping area, a buckle point stamping area and a blanking area in sequence along the moving direction of the material strip;

[0006] The shape stamping area is used to remove part of the waste material on the outside of the silicon steel sheet and expose part of the outer contour of the silicon steel sheet. The half-cutting area is used to punch the silicon steel sheet out of the material strip for a certain distance so that the waste material semi-connected to the silicon steel sheet is formed into a frame for fixing the silicon steel sheet. The shaping area is used to shape the silicon steel sheet and the frame so that the silicon steel sheet and the frame are in the same plane. The buckle point stamping area is used to punch out buckle points on the frame. The blanking area is used to cut the material strip so that the silicon steel sheet and the frame form a separate sheet body, and the sheet body is collected.

[0007] According to one embodiment of the utility model, the number of the shape stamping areas is multiple rows, and the multiple rows of shape stamping areas are spaced apart along the width direction of the material strip so that gaps are left between the multiple rows of silicon steel sheets; each row of the shape stamping areas is spaced apart along the moving direction of the material strip so that silicon steel sheets can be punched out in batches along the moving direction of the material strip, thereby reducing the arrangement distance between silicon steel sheets in the same row after stamping.

[0008] According to one embodiment of the utility model, the number of the half-cutting areas is multiple rows, the multiple rows of half-cutting areas are aligned one by one with the multiple rows of shape stamping areas, each row of the half-cutting areas is arranged at intervals along the moving direction of the material strip, and the multiple rows of the half-cutting areas are staggered.

[0009] According to an embodiment of the utility model, the distance that the half-cut area is punched out of the silicon steel sheet is between 0.5 and 0.8 times the thickness of the silicon steel sheet.

[0010] According to an embodiment of the utility model, a lifting portion is provided on the lower die base, and the lifting portion is located in the half-cutting area. The lifting portion is used to eject the stamped silicon steel sheet from the lower die base.

[0011] According to an embodiment of the utility model, the buckle point punching area includes a buckle point unit and a through hole unit, the buckle point unit is used to punch out buckle points on the sheet body, and the through hole unit is used to punch out through holes at the buckle points on part of the sheet body.

[0012] According to one embodiment of the utility model, the through hole unit includes a cylinder and a slider, the cylinder is arranged on the upper die seat, and the slider is arranged on the output end of the cylinder. When the cylinder is in the output state, the slider protrudes from the lower surface of the upper die seat to cooperate with the lower die seat to complete the stamping of the sheet body. When the cylinder is in the reset state, the slider and the lower surface of the upper die seat are located on the same plane, and no stamping is formed on the sheet body at this time.

[0013] According to one embodiment of the utility model, the lifting part includes a guide rod and a spring, a guide hole is formed inside the lower mold base, the guide hole is connected to the half-cutting area, the spring is arranged inside the guide hole, the guide rod is located inside the half-cutting area, one end of the guide rod is connected to the spring, and when the spring is in a stretched state, the upper surface of the guide rod and the upper surface of the lower mold base are located on the same horizontal plane.

[0014] According to an embodiment of the utility model, there are multiple buckle point units, and the multiple buckle point units are arranged at intervals. When the sheet body is located at the buckle point units, the multiple buckle point units are all located in the area where the frame is located.

[0015] According to an embodiment of the present invention, the number and arrangement orientation of the through hole units are the same as those of the buckle point units.

[0016] The beneficial effect of the utility model is that the utility model adopts a half-cutting area to half-cut part of the outer contour of the silicon steel sheet, so that part of the waste is formed into a frame connecting the silicon steel sheets, and the buckle point stamping area is used to punch out buckle points on the frame, and the buckle points on the frame are used to complete the bonding of multiple silicon steel sheets. After subsequent injection molding and assembly, an iron core without buckle points is formed, which avoids punching buckle points on the silicon steel sheets and improves the performance of the iron core.

[0017] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by implementing the present invention.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments of the present invention, in which:

[0020] Figure 1 It is a schematic diagram of the main view of the overall structure of the utility model;

[0021] Figure 2 This is a three-dimensional schematic diagram of the overall structure of the utility model. In order to facilitate display, part of the structure of the upper die base is hidden in this view;

[0022] Figure 3 This is a schematic diagram of the overall structure of the utility model. In order to facilitate display, part of the structure of the upper die base is hidden in this view;

[0023] Figure 4 It is a schematic diagram of the sheet structure of the utility model;

[0024] Reference numerals:

[0025] 1. Upper die base; 2. Lower die base; 21. Guide hole; 31. Guide rod; 32. Spring; 33. Connecting column; 34. Guide ring; 41. Cylinder; 42. Slider; 5. Positioning area; 6. Silicon steel sheet; 7. Frame; 8. Buckle point; 91. Outer shape stamping area; 92. Half-cut area; 93. Shaping area; 94. Buckle point stamping area; 95. Blanking area. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present utility model, it is necessary to understand 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 accompanying drawings, and are only for the convenience of describing the present utility model 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 utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The punching die for the rivet-free core according to the embodiment of the utility model will be described in detail below with reference to the accompanying drawings.

[0030] Figure 1-3 In the figure, a part of the lower die base 2 is cut away for the sake of convenience.

[0031] like Figure 1-Figure 4 As shown, the stamping die for the rivet-free core according to the embodiment of the utility model comprises: an upper die seat 1 and a lower die seat 2, the upper die seat 1 and the lower die seat 2 are arranged opposite to each other, the material strip moves between the upper die seat 1 and the lower die seat 2, a punch is formed on the upper die seat 1, and a concave die matching the punch is formed on the lower die seat 2, and the upper die seat 1 and the lower die seat 2 are provided with an outer shape stamping area 91, a half-cutting area 92, a shaping area 93, a buckle point stamping area 94 and a blanking area 95 in sequence along the moving direction of the material strip;

[0032] The outer shape stamping area 91 is used to remove part of the waste material on the outside of the silicon steel sheet 6 to expose part of the outer contour of the silicon steel sheet 6. The half-cutting area 92 is used to punch the silicon steel sheet 6 out of the material strip for a certain distance so that the waste material half-connected to the silicon steel sheet 6 is formed into a frame 7 for fixing the silicon steel sheet 6. The shaping area 93 is used to shape the silicon steel sheet 6 and the frame 7 so that the silicon steel sheet 6 and the frame 7 are in the same plane. The buckle point stamping area 94 is used to punch out buckle points 8 on the frame 7. The blanking area 95 is used to cut the material strip so that the silicon steel sheet 6 and the frame 7 form a separate sheet body and collect the sheets.

[0033] In this embodiment, a plurality of positioning areas 5 are provided on the upper die base 1 and the lower die base 2 along the moving direction of the material belt to form positioning holes on each sheet body so as to determine the position of the silicon steel sheet 6 in subsequent operations. The outer shape stamping area 91 is used to punch out part of the outline of the silicon steel sheet 6 and remove part of the waste material. The part where the waste material is removed is the subsequent injection molding area. The remaining part of the waste material is punched through the half-cut area 92 and then continues to be connected with the silicon steel sheet 6 to form a frame body 7 for fixing and positioning the silicon steel sheet 6. The buckle point stamping area 94 is used to form buckle points 8 on the frame body 7. After the sheets are collected in the blanking area 95, the buckle points 8 between the frames 7 are riveted to each other to achieve stacking and fixing of multiple silicon steel sheets 6. Since the shaping area 93 shapes the silicon steel sheet 6 and the frame body 7 so that the two are located in the same plane, multiple When the frames 7 are tightly connected to each other, the multiple silicon steel sheets 6 also achieve a tight fit. After the multiple sheets are riveted, injection molding is performed in the injection molding area, and the multiple silicon steel sheets 6 are fixed by the injection molding process. After the injection molded parts are formed, the frame 7 is removed to complete the production of the silicon steel sheet 6. This process avoids punching buckle points 8 on the silicon steel sheet 6, thereby achieving the integrity of the silicon steel sheet 6. The frame 7 is formed using waste materials, and the silicon steel sheet 6 is fixed by punching buckle points 8 on the frame 7, thereby achieving the accuracy of positioning the silicon steel sheet 6 and the fit between the silicon steel sheets 6. The half-cutting process is used to reduce the connection area between the silicon steel sheet 6 and the frame 7, so that the waste can be removed easily after the injection molding is completed, thereby avoiding the difficulty in removing the frame 7 due to the large thickness of multiple silicon steel sheets 6 stacked together.

[0034] The punches of the positioning area 5, the shape stamping area 91, the half-cutting area 92, the shaping area 93, the buckle point stamping area 94 and the blanking area 95 are all installed on the upper die base 1 to improve the flexibility of the positioning area 5, the shape stamping area 91, the half-cutting area 92, the shaping area 93, the buckle point stamping area 94 and the blanking area 95, so as to facilitate production and subsequent replacement.

[0035] There are multiple rows of shape stamping areas 91, and the multiple rows of shape stamping areas 91 are spaced apart along the width direction of the material strip so that gaps are left between the multiple rows of silicon steel sheets 6; each row of shape stamping areas 91 is spaced apart along the moving direction of the material strip so that the silicon steel sheets 6 can be punched out in batches along the moving direction of the material strip, thereby reducing the arrangement distance between the silicon steel sheets 6 in the same row after stamping.

[0036] In this embodiment, the silicon steel sheets 6 punched out of the outer shape stamping area 91 are arranged in a fan-shaped structure, so that multiple silicon steel sheets 6 form iron core sub-units after injection molding is completed, and the iron core is formed by multiple iron core sub-units arranged and combined along the circumferential direction. Therefore, the silicon steel sheets 6 are arranged in a rectangular shape on the material strip to reduce the waste area and improve the utilization rate of the material strip.

[0037] Preferably, there are two rows of outer shape stamping areas 91 on the material strip to form two rows of silicon steel sheets 6. The two rows of outer shape stamping areas 91 are spaced apart so that a partial frame 7 is formed between the two silicon steel sheets 6 to connect the two rows of silicon steel sheets 6. Each row of outer shape stamping areas 91 is spaced apart so as to punch out two adjacent silicon steel sheets 6 in the same row in batches, thereby facilitating the assembly of the outer shape stamping areas 91 while reducing the distance between two adjacent silicon steel sheets 6 in the same row, thereby achieving compactness in the arrangement of the silicon steel sheets 6.

[0038] The number of the half-cut areas 92 is multiple rows, and the multiple rows of half-cut areas 92 are aligned one by one with the multiple rows of shape stamping areas 91. The half-cut areas 92 in each row are arranged at intervals along the moving direction of the material strip, and the multiple rows of half-cut areas 92 are staggered.

[0039] That is to say, there are two rows of half-cut areas 92, and the two rows of half-cut areas 92 punch out two rows of silicon steel sheets 6 respectively, and only one of the two silicon steel sheets 6 in the same column of the two rows of silicon steel sheets 6 is punched out, so as to facilitate the assembly of the components of the half-cut areas 92 and avoid interference between multiple half-cut areas 92.

[0040] The distance that the half-cut area 92 punches out of the silicon steel sheet 6 is between 0.5 and 0.8 times the thickness of the silicon steel sheet 6 .

[0041] In this embodiment, if the silicon steel sheet 6 and the frame 7 are completely cut off or the distance punched out of the silicon steel sheet 6 is greater than 0.8 times the thickness of the silicon steel sheet 6, the silicon steel sheet 6 and the frame 7 will be separated when multiple sheets are stacked later. Therefore, the fit between the multiple silicon steel sheets 6 cannot be guaranteed. If the distance punched out of the silicon steel sheet 6 is less than 0.5 times the thickness of the silicon steel sheet 6, the connection between the silicon steel sheet 6 and the frame 7 will be thicker, which is not convenient for subsequent separation of the frame 7. Therefore, the distance punched out of the silicon steel sheet 6 is between 0.5-0.8 times the thickness of the silicon steel sheet 6 to achieve a firm connection while reducing the difficulty of separating the frame 7.

[0042] A lifting portion is provided on the lower die base 2, and the lifting portion is located in the half-cut area 92. The lifting portion is used to eject the stamped silicon steel sheet 6 from the lower die base 2 to avoid the silicon steel sheet 6 being stuck in the lower die base 2, causing the silicon steel sheet 6 to separate or shift from the frame 7 during the movement of the material strip, resulting in the silicon steel sheet 6 being unable to be reset during the subsequent shaping process. The lifting portion ensures the flatness between the silicon steel sheet 6 and the frame 7 during the subsequent shaping.

[0043] The lifting part includes a guide rod 31 and a spring 32. A guide hole 21 is formed inside the lower die base 2. The guide hole 21 is connected to the half-cut area 92. The other end of the spring 32 is fixed inside the guide hole 21. The guide rod 31 is located inside the half-cut area 92. One end of the guide rod 31 is connected to the spring 32. When the spring 32 is in a stretched state, the upper surface of the guide rod 31 and the upper surface of the lower die base 2 are located on the same horizontal plane.

[0044] That is to say, the guide hole 21 is located below the recessed part of the half-cutting area 92, and the guide hole 21 is connected to the recessed part of the half-cutting area 92, and the guide rod 31 is located in the recessed part of the half-cutting area 92. In the process of the upper die seat 1 moving downward to punch the silicon steel sheet 6, the silicon steel sheet 6 pushes down the guide rod 31 and sinks into the recessed part of the half-cutting area 92. At this time, the spring 32 is in a compressed state. When the upper die seat 1 returns to its position, the spring 32 releases the lifting guide rod 31, so that the guide rod 31 returns to its position, so as to push out the silicon steel sheet 6 in the recessed part of the half-cutting area 92 to prevent the silicon steel sheet 6 from being stuck in the recessed part of the half-cutting area 92.

[0045] Furthermore, a connecting column 33 is installed at the bottom of the guide rod 31, and the connecting column 33 is located between the guide rod 31 and the spring 32. The hardness of the connecting column 33 is greater than the hardness of the guide rod 31. The connecting column 33 with greater hardness is not easy to deform during the long-term extrusion process with the spring 32, so as to ensure the height accuracy of the guide rod 31 and reduce the hardness requirement of the guide rod 31, thereby ensuring the yield while reducing the production cost.

[0046] A guide ring 34 is fixedly installed in the guide hole 21. The inner wall of the guide ring 34 fits the circumferential surface of the connecting column 33. The two are slidably connected to guide the connecting column 33 to prevent the connecting column 33 from tilting and causing movement jamming. The guide ring 34 is located at the upper end of the spring 32 to limit the spring 32.

[0047] The buckle point punching area 94 includes a buckle point unit and a through hole unit. The buckle point unit is used to punch out buckle points 8 on the sheet body, and the through hole unit is used to punch out through holes at the buckle points 8 on part of the sheet body.

[0048] The through-hole unit includes a cylinder 41 and a slider 42. The cylinder 41 is fixed on the upper die base 1, and the slider 42 is fixed on the output end of the cylinder 41. When the cylinder 41 is in the output state, the slider 42 protrudes from the lower surface of the upper die base 1 to cooperate with the lower die base 2 to complete the stamping of the sheet. When the cylinder 41 is in the reset state, the slider 42 and the lower surface of the upper die base 1 are located on the same plane, and no stamping is formed on the sheet at this time.

[0049] In this embodiment, in order to ensure that after multiple sheets are stacked, their upper and lower surfaces are both flat, so that the silicon steel sheets 6 and the frame 7 can be subjected to force at the same time during subsequent stacking, and the fit between the silicon steel sheets 6 and the frame 7 is ensured, the buckle point 8 of the bottom sheet among the multiple sheets is a through hole, that is, the buckle point 8 of the upper sheet is sunken into the through hole of the bottom sheet, so after each certain number of sheets, a through hole needs to be punched out at the buckle point 8 of a sheet, and a cylinder 41 and a movable slider 42 are used to complete the operation of punching out the through hole when necessary.

[0050] There are multiple buckle point units, which are arranged at intervals. When the sheet body is located at the buckle point units, the multiple buckle point units are all located in the area where the frame body 7 is located.

[0051] That is to say, the buckle points 8 punched out of the multiple buckle point units are dispersedly arranged on the frame 7 to improve the uniformity of connection during stacking and make the multiple silicon steel sheets 6 fit more closely.

[0052] The number and arrangement of through-hole units are the same as those of buckle point units.

[0053] The travel distance of each step of the material belt is the distance of one sheet.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stamping die for a rivet-free iron core, characterized in that: include: An upper die base (1) and a lower die base (2), wherein the upper die base (1) and the lower die base (2) are arranged opposite to each other, and the material strip moves between the upper die base (1) and the lower die base (2), a convex die is formed on the upper die base (1), and a concave die matching the convex die is formed on the lower die base (2), and the upper die base (1) and the lower die base (2) are provided with an outer shape stamping area (91), a half-cutting area (92), a shaping area (93), a buckle point stamping area (94) and a blanking area (95) in sequence along the moving direction of the material strip; The outer shape punching area (91) is used to remove part of the waste material outside the silicon steel sheet (6) to expose part of the outer contour of the silicon steel sheet (6); the half-cutting area (92) is used to punch the silicon steel sheet (6) out of the material strip by a certain distance so that the waste material semi-connected to the silicon steel sheet (6) is formed into a frame (7) for fixing the silicon steel sheet (6); the shaping area (93) is used to shape the silicon steel sheet (6) and the frame (7) so that the silicon steel sheet (6) and the frame (7) are in the same plane; the buckle point punching area (94) is used to punch out buckle points (8) on the frame (7); and the blanking area (95) is used to cut the material strip so that the silicon steel sheet (6) and the frame (7) form a single sheet body, and collect the sheet bodies.

2. The stamping die for the rivet-free core according to claim 1, characterized in that: The number of the outer shape stamping areas (91) is multiple rows, and the multiple rows of the outer shape stamping areas (91) are arranged at intervals along the width direction of the material strip, so that gaps are left between the multiple rows of silicon steel sheets (6); each row of the outer shape stamping areas (91) is arranged at intervals along the moving direction of the material strip, so that the silicon steel sheets (6) are stamped out in batches along the moving direction of the material strip, thereby reducing the arrangement distance between the silicon steel sheets (6) in the same row after stamping.

3. The stamping die for the rivet-free core according to claim 2, characterized in that: The number of the half-cut areas (92) is multiple rows, the multiple rows of the half-cut areas (92) are aligned one by one with the multiple rows of the shape stamping areas (91), each row of the half-cut areas (92) is arranged at intervals along the moving direction of the material strip, and the multiple rows of the half-cut areas (92) are arranged in a staggered manner.

4. The stamping die for the rivet-free core according to claim 3, characterized in that: The distance that the half-cut area (92) punches out of the silicon steel sheet (6) is between 0.5 and 0.8 times the thickness of the silicon steel sheet (6).

5. The stamping die for the rivet-free core according to claim 4, characterized in that: The lower die seat (2) is provided with a lifting portion, the lifting portion is located in the half-cut area (92), and the lifting portion is used to eject the stamped silicon steel sheet (6) from the lower die seat (2).

6. The stamping die for the rivet-free core according to claim 5, characterized in that: The buckle point punching area (94) comprises a buckle point unit and a through hole unit, wherein the buckle point unit is used to punch out buckle points (8) on the sheet body, and the through hole unit is used to punch out through holes at the buckle points (8) on part of the sheet body.

7. The stamping die for the rivet-free core according to claim 6, characterized in that: The through-hole unit comprises a cylinder (41) and a slider (42); the cylinder (41) is arranged on an upper die seat (1); the slider (42) is arranged on an output end of the cylinder (41); when the cylinder (41) is in an output state, the slider (42) protrudes from the lower surface of the upper die seat (1) to cooperate with the lower die seat (2) to complete the stamping of the sheet; when the cylinder (41) is in a reset state, the slider (42) and the lower surface of the upper die seat (1) are located on the same plane, and no stamping is formed on the sheet at this time.

8. The stamping die for the rivet-free core according to claim 7, characterized in that: The lifting part comprises a guide rod (31) and a spring (32); a guide hole (21) is formed inside the lower die seat (2); the guide hole (21) is connected to the half-cutting area (92); the spring (32) is arranged inside the guide hole (21); the guide rod (31) is located inside the half-cutting area (92); one end of the guide rod (31) is connected to the spring (32); when the spring (32) is in a stretched state, the upper surface of the guide rod (31) and the upper surface of the lower die seat (2) are located on the same horizontal plane.

9. The stamping die for the rivet-free core according to claim 6, characterized in that: There are a plurality of buckle point units, and the plurality of buckle point units are arranged at intervals. When the sheet body is located at the buckle point units, the plurality of buckle point units are all located in the area where the frame (7) is located.

10. The stamping die for the rivet-free core according to claim 9, characterized in that: The number and arrangement orientation of the through-hole units are the same as those of the buckle point units.

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