Tool and riveting method for riveting a starter stator lamination

Abstract

This invention relates to the field of riveting fixture technology, and more particularly to a fixture for riveting a starter stator wire clamping piece. It includes an upper plate and a lower plate. The lower surface of the upper plate is provided with a first punch and a second punch. The upper surface of the lower plate is provided with a mounting block. A riveting plate is located between the first punch and the second punch on the mounting block. The riveting plate is provided with a first riveting part and a second riveting part. The lower surface of the first riveting part includes a first bending surface and a first riveting surface, and the lower surface of the second riveting part includes a second bending surface and a second riveting surface. In this invention, by placing the wire clamping piece on the riveting plate and starting the press to press down the upper plate, the first end of the wire clamping piece presses against the enameled wire under the action of the first riveting part; continuing to press down the upper plate, the second end of the wire clamping piece presses against the first end of the wire clamping piece under the action of the second riveting part. This solution replaces manual labor with a machine, allowing the wire clamping piece to better clamp the enameled wire. This invention also includes a riveting method.

Description

Technical Field

[0001] This invention relates to the field of riveting tooling technology, and in particular to a tooling and riveting method for riveting starter stator pressure plates. Background Technology

[0002] In the starter motor manufacturing process, one step in the stator fabrication process involves riveting the enameled wire of the stator assembly leads into the clamping plates, and then connecting the brushes and clamping plates using connecting wires. Many existing clamping techniques still rely on manually pressing the clamping plates flat to secure the enameled wire. The clamping plates are U-shaped; the enameled wire is placed in the middle, and the worker bends both ends of the clamping plate inward before flattening it with the clamping pliers to tighten the wire. However, this operation is inconvenient, and because it is manual, the clamping plates may not fully compress the wire, resulting in larger gaps between the wires. This leads to insufficient contact between the wires and the clamping plates, causing the wires to loosen and fall off, ultimately causing starter motor malfunctions during operation. Therefore, this manual wire crimping technique has significant drawbacks and is very inefficient. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a tooling and riveting method for riveting starter stator pressure plates, so that the pressure plates can better press the enameled wire.

[0004] The technical solution adopted by the present invention to solve its technical problem is a tooling for riveting starter stator pressure plates, including an upper plate and a lower plate, wherein a jig body is provided on the lower side of the lower plate and an arc-shaped mounting groove is provided on the upper surface of the jig body.

[0005] The lower surface of the upper plate is provided with a first punch and a second punch facing each other. The upper surface of the lower plate is provided with a mounting block. The mounting block is provided with a first channel for the first punch to pass through, a second channel for the second punch to pass through, and a riveting plate located between the first punch and the second punch. A first riveting part and a second riveting part are provided above the riveting plate. The first riveting part and the second riveting part are arranged opposite to each other. The lower end of the first riveting part is lower than the lower end of the second riveting part. The first riveting part is fixedly connected to the first punch, and the second riveting part is fixedly connected to the second punch.

[0006] The lower surface of the first riveting part includes a first bending surface and a first riveting surface connected together, the first bending surface being connected to the side of the first punch; the lower surface of the second riveting part includes a second bending surface and a second riveting surface connected together, the second bending surface being connected to the side of the second punch.

[0007] The lower surface of the upper plate is provided with a guide shell with an opening at the lower end. A riveting spring is provided inside the guide shell. The upper end of the riveting spring is connected to the bottom of the guide shell, and the lower end is connected to the upper end of the first punch. A riveting space is formed between the first riveting part, the second riveting part, the first punch, the second punch, and the riveting plate.

[0008] Guide rods are provided on both sides of the mounting block between the upper plate and the lower plate, and an elastic reset mechanism is provided between the guide rods and the upper plate.

[0009] Furthermore, both the first bending surface and the second bending surface are arc surfaces.

[0010] Furthermore, both the first bending surface and the second bending surface are inclined surfaces.

[0011] Furthermore, the first riveting part and the second riveting part are in contact with each other.

[0012] Furthermore, the lower plate is provided with a third channel for the first punch to pass through and a fourth channel for the second punch to pass through, the third channel being opposite to the first channel and the second channel being opposite to the fourth channel.

[0013] Furthermore, the elastic reset mechanism includes a first reset spring and a guide sleeve respectively sleeved on the guide rod. The upper end of the first reset spring is connected to the guide sleeve, and the lower end is connected to the guide rod or the lower plate. The upper plate is provided with a through hole, and the guide sleeve passes through the through hole. The upper plate can move up and down relative to the guide rod.

[0014] Furthermore, a gasket is provided at the upper end of the guide rod.

[0015] Furthermore, the elastic reset mechanism includes a second reset spring, and the guide rod includes an upper rod and a lower rod. The lower rod has a cavity for placing the second reset spring. The lower end of the second reset spring is connected to the bottom of the cavity, and the upper end is connected to the lower end of the upper rod. The upper rod is inserted into the cavity of the lower rod.

[0016] Furthermore, a first limiting post is provided on the lower surface of the upper plate, and a second limiting post is provided on the upper surface of the lower plate, with the first limiting post and the second limiting post facing each other.

[0017] The riveting method, using the aforementioned tooling for riveting starter stator clamping plates, includes the following steps:

[0018] The pressure plate is placed on the rivet plate with its opening facing upwards; the stator assembly is placed in the groove of the carcass, and the enameled wire of the lead wire on the stator assembly is placed in the opening of the pressure plate;

[0019] Start the press and press down the upper plate, causing the upper plate to move downwards, which in turn drives the first punch and the second punch to move downwards until the first end of the pressure plate contacts the first bending surface. The first bending surface bends the first end of the pressure plate. Continue to press down the upper plate, and under the action of the first riveting surface, the first end of the pressure plate presses down on the enameled wire.

[0020] Continue pressing down on the upper plate, compressing the riveting spring to keep the first punch stationary, while the second punch moves downward until the second end of the pressure plate contacts the second bending surface. The second bending surface bends the second end of the pressure plate. Continue pressing down on the upper plate, and under the action of the second riveting surface, the second end of the pressure plate presses against the first end of the pressure plate. Release the press, and the elastic reset mechanism returns the upper plate to its initial position.

[0021] The beneficial effects of this invention are as follows: by setting a first riveting part, a second riveting part, a first punch, a second punch, and a riveting plate, a wire pressing piece is placed on the riveting plate, and the press is started to press down the upper plate. Under the action of the first riveting part, the first end of the wire pressing piece presses down on the enameled wire; the upper plate is pressed down further, and under the action of the second riveting part, the second end of the wire pressing piece presses down on the first end of the wire pressing piece. In this solution, the machine replaces manual labor, and the wire pressing piece can better press the enameled wire, avoiding the enameled wire from loosening and falling off in the wire pressing piece. Attached Figure Description

[0022] Figure 1 This is a perspective view of the present invention;

[0023] Figure 2 yes Figure 1 A sectional view;

[0024] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 This is a perspective view of another embodiment of the present invention;

[0026] Figure 5 yes Figure 4 A sectional view;

[0027] Figure 6 This is a schematic diagram of the mounting block;

[0028] Figure 7 These are schematic diagrams of the first and second riveting parts.

[0029] Figures 8 to 14 This is a schematic diagram of the riveting process.

[0030] Reference numerals: 1-Upper plate; 101-Gasket; 102-Guide sleeve; 2-Lower plate; 201-Third channel; 202-Fourth channel; 3-Carcass; 301-Mounting groove; 4-First punch; 401-First riveting part; 402-First bending surface; 403-First riveting surface; 404-Guide shell; 405-Riveting spring; 5-Second punch; 501-Second riveting part; 502-Second bending surface; 503-Second riveting surface; 6-Mounting block; 601-First channel; 602-Second channel; 603-Riveting plate; 7-Guide rod; 701-First return spring; 702-Upper rod; 703-Lower rod; 704-Second return spring; 8-First limiting post; 9-Second limiting post; 10-Fitting piece; 11-Enameled wire. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0032] like Figures 1-7 As shown, the tooling for riveting the stator pressure plate 10 of the starter motor includes an upper plate 1 and a lower plate 2. A tire body 3 is provided on the lower side of the lower plate 2, and an arc-shaped mounting groove 301 is provided on the upper surface of the tire body 3.

[0033] The upper plate 1 and the lower plate 2 are both rigid parts that need to withstand the pressure of the press, and steel parts are preferred. The connection between the tire body 3 and the lower plate 2 can be bolted or integrally formed with the lower plate 2. The mounting groove 301 is arc-shaped and is used to install the starter stator assembly.

[0034] The lower surface of the upper plate 1 is provided with a first punch 4 and a second punch 5 facing each other. The upper surface of the lower plate 2 is provided with a mounting block 6. The mounting block 6 is provided with a first channel 601 for the first punch 4 to pass through, a second channel 602 for the second punch 5 to pass through, and a riveting plate 603 located between the first punch 4 and the second punch 5. A first riveting part 401 and a second riveting part 501 are provided above the riveting plate 603. The first riveting part 401 and the second riveting part 501 are arranged opposite each other. The lower end of the first riveting part 401 is lower than the lower end of the second riveting part 501. The first riveting part 401 is fixedly connected to the first punch 4, and the second riveting part 501 is fixedly connected to the second punch 5.

[0035] The first punch 4 and the second punch 5 are columnar and can be connected to the upper plate 1 by welding or bolting. The mounting block 6 is a square block and is connected to the lower plate 2 by bolting or welding. The outer dimension of the first channel 601 is larger than that of the first punch 4, which facilitates the vertical movement of the first punch 4 in the first channel 601. The first channel 601 also serves as a guide for the first punch 4. Similarly, the outer dimension of the second channel 602 is larger than that of the second punch 5, which facilitates the vertical movement of the second punch 5 in the second channel 602. The second channel 602 also serves as a guide for the second punch 5. The first channel 601 and the second channel 602 are manufactured on the mounting block 6 by wire cutting or manual flaring. The portion of the mounting block 6 between the first channel 601 and the second channel 602 serves as a riveting plate 603. The first riveting part 401 and the second riveting part 501 are used to press the wire pressing piece 10. The riveting, where the first riveting part 401 and the second riveting part 501 are positioned opposite each other, means that the first riveting part 401 and the second riveting part are located on two adjacent side walls of the first punch 4 and the second punch 5. The lower end of the first riveting part 401 is lower than the lower end of the second riveting part 501, meaning that the first riveting surface 403 of the first riveting part 401 is below the second riveting surface 503 of the second riveting part 501. This arrangement allows the first riveting part 401 to contact the first end of the pressure plate 10 first, and then the second riveting part 501 to contact the second end of the pressure plate 10. This ensures that the second end of the pressure plate 10 can press against the first end, forming a sealed ring and preventing the enameled wire 11 from coming out of the pressure plate 10. The connection between the first riveting part 401 and the first punch 4 can be achieved by bolts, welding, or integral molding. Similarly, the connection between the second riveting part 501 and the second punch 5 can be achieved by bolts, welding, or integral molding.

[0036] The lower surface of the first riveting part 401 includes a first bending surface 402 and a first riveting surface 403 connected to each other. The first bending surface 402 is connected to the side of the first punch 4. The lower surface of the second riveting part 501 includes a second bending surface 502 and a second riveting surface 503 connected to each other. The second bending surface 502 is connected to the side of the second punch 5.

[0037] The function of the first bending surface 402 is to bend the first end of the pressure piece 10, and after bending, the first end of the pressure piece 10 moves toward the first riveting surface 403. The function of the first riveting surface 403 is to press the first end of the pressure piece 10 against the enameled wire 11. The function of the second bending surface 502 is to bend the second end of the pressure piece 10, and after bending, the second end of the pressure piece 10 moves toward the second riveting surface 503. The function of the second riveting surface 503 is to press the second end of the pressure piece 10 against the first end of the pressure piece 10. Both the first bending surface 402 and the second bending surface 502 can be elliptical arc surfaces, and the first riveting surface 403 and the second riveting surface 503 can be flat or arc surfaces.

[0038] The lower surface of the upper plate 1 is provided with a guide shell 404 with an opening at the lower end. A riveting spring 405 is provided inside the guide shell 404. The upper end of the riveting spring 405 is connected to the bottom of the guide shell 404, and the lower end is connected to the upper end of the first punch 4. A riveting space is formed between the first riveting part 401, the second riveting part 501, the first punch 4, the second punch 5, and the riveting plate 603.

[0039] The guide shell 404 is cylindrical. The guide shell 404 and the upper plate 1 can be connected by welding or bolts. A riveting spring 405 is installed inside the guide shell 404. The upper end of the riveting spring 405 is connected to the bottom of the guide shell 404, and the lower end is connected to the upper end of the first punch 4. This arrangement ensures that after the first end of the pressure plate 10 presses the enameled wire 11, further pressing down on the upper plate 1 compresses the riveting spring 405, keeping the first punch 4 stationary. Simultaneously, the second punch 5 moves downward until the second end of the pressure plate 10 presses against the second end of the pressure plate 10. A riveting space is formed between the first riveting part 401, the second riveting part 501, the first punch 4, the second punch 5, and the riveting plate 603. This riveting space is used to place the pressure plate 10 and the enameled wire 11.

[0040] Guide rods 7 are provided on both sides of the mounting block 6 between the upper plate 1 and the lower plate 2. Each guide rod 7 has an elastic reset mechanism. The guide rods 7 guide the upper plate 1 when the press presses it down. The guide rods 7 can be cylindrical or square. The two sides of the mounting block 6 refer to the side of the first punch 4 away from the second punch 5 and the side of the second punch 5 away from the first punch 4. There can be one or two guide rods 7 on each side, depending on the actual situation. The elastic reset mechanism resets the upper plate 1 to its initial position after the wire pressing piece 10 has completed the riveting operation of the enameled wire 11.

[0041] The first bending surface 402 and the second bending surface 502 are elliptical surfaces. Although this allows for bending of the first and second ends of the pressure plate 10, the processing of elliptical surfaces is not easy. Further details can be found in [link to relevant documentation]. Figure 7 The first bending surface 402 is an arc surface, and the second bending surface 502 is an arc surface, or the first bending surface 402 is an inclined surface, and the second bending surface 502 is an inclined surface.

[0042] There is a gap between the first riveting part 401 and the second riveting part 501. This prevents the end of the second end of the wire pressing piece 10 from properly adhering to the first end of the wire pressing piece 10 during the riveting process. To ensure that the second end of the wire pressing piece 10 can better press against the first end of the wire pressing piece 10, further, see... Figure 7 The first riveting part 401 and the second riveting part 501 are attached to each other.

[0043] In order to increase the height of the riveting space and the stroke of the first punch 4 and the second punch 5, so that more enameled wire 11 can be placed in the riveting space, further, see Figure 2 and Figure 5 The lower plate 2 is provided with a third channel 201 for the passage of the first punch 4 and a fourth channel 202 for the passage of the second punch 5. The third channel 201 is opposite to the first channel 601, and the second channel 602 is opposite to the fourth channel 202. The outer dimensions of the third channel 201 are larger than those of the first punch 4, facilitating the vertical movement of the first punch 4 within the third channel 201. The third channel 201 also serves as a guide for the first punch 4. Similarly, the outer dimensions of the fourth channel 202 are larger than those of the second punch 5, facilitating the vertical movement of the second punch 5 within the fourth channel 202. The fourth channel 202 also serves as a guide for the second punch 5. The fact that the third channel 201 is opposite to the first channel 601 and the second channel 602 is opposite to the fourth channel 202 means that the first punch 4 can pass through the first channel 601 and the third channel 201 in sequence, and the second punch 5 can pass through the second channel 602 and the fourth channel 202 in sequence.

[0044] Further, see Figure 1 and Figure 2 As one embodiment of the elastic reset mechanism, the elastic reset mechanism includes a first reset spring 701 and a guide sleeve 102 respectively sleeved on the guide rod 7. The upper end of the first reset spring 701 is connected to the guide sleeve 102, and the lower end is connected to the guide rod 7 or the lower plate 2. The upper plate 1 is provided with a through hole, and the guide sleeve 102 passes through the through hole. The upper plate 1 can move up and down relative to the guide rod 7.

[0045] The guide sleeve 102 is cylindrical and is fitted onto the guide rod 7. The guide sleeve 102 is installed in the through hole of the upper plate 1. The upper end of the first return spring 701 is connected to the guide sleeve 102, and the lower end is connected to the guide rod 7 or the lower plate 2. This arrangement allows the upper plate 1 to move up and down relative to the guide rod 7 under the action of the press.

[0046] To prevent the upper plate 1 from detaching from the guide rod 7, further see... Figure 1 and Figure 2 A gasket 101 is provided at the upper end of the guide rod 7. The gasket 101 is round or square, and the outer dimension of the gasket 101 is larger than the outer dimension of the guide sleeve 102. The gasket 101 plays a limiting role for the upper plate 1.

[0047] Further, see Figure 4 and Figure 5 In another embodiment of the elastic reset mechanism, the elastic reset mechanism includes a second reset spring 704. The guide rod 7 includes an upper rod 702 and a lower rod 703. The lower rod 703 has a cavity for placing the second reset spring 704. The lower end of the second reset spring 704 is connected to the bottom of the cavity, and the upper end is connected to the lower end of the upper rod 702. The upper rod 702 is inserted into the cavity of the lower rod 703. The outer dimensions of the upper rod 702 are smaller than those of the lower rod 703. The upper end of the cavity of the lower rod 703 is open. The upper rod 702 is inserted into the cavity of the lower rod 703. The upper end of the upper rod 702 is bolted or welded to the lower surface of the upper plate 1, and the lower end of the lower rod 703 is bolted or welded to the upper surface of the lower plate 2. Using the second reset spring 704, the upper rod 702 can move up and down relative to the lower rod 703, thereby causing the upper plate 1 to move up and down relative to the lower plate 2.

[0048] To limit the movement distance of the first punch 4 and the second punch 5, and to avoid deformation of the enameled wire 11 due to excessive riveting; further, see... Figure 2 and Figure 5 The lower surface of the upper plate 1 is provided with a first limiting post 8, and the upper surface of the lower plate 2 is provided with a second limiting post 9. The first limiting post 8 and the second limiting post 9 are opposite to each other. The first limiting post 8 and the upper plate 1 can be connected by welding or bolting, and the second limiting post 9 and the lower plate 2 can be connected by welding or bolting. The distance between the first limiting post 8 and the second limiting post 9 is the maximum distance that the second punch 5 can move. The first limiting post 8 and the second limiting post 9 are opposite to each other because when the upper plate 1 moves downward the maximum distance, the lower end of the first limiting post 8 and the upper end of the second limiting post 9 are in contact.

[0049] The riveting method uses the aforementioned tooling for riveting the starter stator pressure plate 10, see [link to tooling description]. Figures 8-14 Includes the following steps,

[0050] See Figure 8 The pressure plate 10 is placed on the rivet plate 603 with the opening of the pressure plate 10 facing upward; the stator assembly is placed in the groove of the carcass 3, and the enameled wire 11 of the lead wire on the stator assembly is placed in the opening of the pressure plate 10.

[0051] The press is started, pressing down the upper plate 1, causing it to move downwards, which in turn moves the first punch 4 and the second punch 5 downwards. Figure 9 As shown, until the first end of the pressure plate 10 contacts the first bending surface 402, as... Figure 10 As shown, the first bending surface 402 bends the first end of the pressure plate 10, and continues to press down on the upper plate 1, as... Figure 11 As shown, under the action of the first riveting surface 403, the first end of the wire pressing piece 10 presses against the enameled wire 11.

[0052] Continue pressing down on the upper plate 1, compressing the riveting spring 405, keeping the first punch 4 stationary, while the second punch 5 moves downwards, as... Figure 12 As shown, until the second end of the pressure plate 10 contacts the second bending surface 502, as... Figure 13 As shown, the second bending surface 502 bends the second end of the pressure plate 10, and continues to press down on the upper plate 1, as... Figure 14 As shown, under the action of the second riveting surface 503, the second end of the pressure plate 10 presses against the first end of the pressure plate 10; when the press is released, the elastic reset mechanism returns the upper plate 1 to its initial position.

[0053] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A tooling for riveting starter stator pressure plates, comprising an upper plate (1) and a lower plate (2), wherein a tire body (3) is provided on the lower side of the lower plate (2), and an arc-shaped mounting groove (301) is provided on the upper surface of the tire body (3). Its features are: The lower surface of the upper plate (1) is provided with a first punch (4) and a second punch (5) facing each other. The upper surface of the lower plate (2) is provided with a mounting block (6). The mounting block (6) is provided with a first channel (601) for the first punch (4) to pass through, a second channel (602) for the second punch (5) to pass through, and a riveting plate (603) located between the first punch (4) and the second punch (5). A first riveting part (401) and a second riveting part (501) are provided above the riveting plate (603). The first riveting part (401) and the second riveting part (501) are arranged opposite each other. The lower end of the first riveting part (401) is lower than the lower end of the second riveting part (501). The first riveting part (401) is fixedly connected to the first punch (4), and the second riveting part (501) is fixedly connected to the second punch (5). The lower surface of the first riveting part (401) includes a first bending surface (402) and a first riveting surface (403) connected together. The first bending surface (402) is connected to the side of the first punch (4). The lower surface of the second riveting part (501) includes a second bending surface (502) and a second riveting surface (503) connected together. The second bending surface (502) is connected to the side of the second punch (5). The lower surface of the upper plate (1) is provided with a guide shell (404) with an opening at the lower end. A riveting spring (405) is provided inside the guide shell (404). The upper end of the riveting spring (405) is connected to the bottom of the guide shell (404), and the lower end is connected to the upper end of the first punch (4). A riveting space is formed between the first riveting part (401), the second riveting part (501), the first punch (4), the second punch (5), and the riveting plate (603). A guide rod (7) is provided between the upper plate (1) and the lower plate (2) on both sides of the mounting block (6), and an elastic reset mechanism is provided on the guide rod (7); the first bending surface (402) is an arc surface, and the second bending surface (502) is an arc surface; or the first bending surface (402) is an inclined surface, and the second bending surface (502) is an inclined surface; the first riveting part (401) and the second riveting part (501) are in contact with each other.

2. The tooling for riveting starter stator clamping plates as described in claim 1, characterized in that: The lower plate (2) is provided with a third channel (201) for the first punch (4) to pass through and a fourth channel (202) for the second punch (5) to pass through. The third channel (201) is opposite to the first channel (601), and the second channel (602) is opposite to the fourth channel (202).

3. The tooling for riveting starter stator clamping plates as described in claim 1, characterized in that: The elastic reset mechanism includes a first reset spring (701) and a guide sleeve (102) respectively sleeved on the guide rod (7). The upper end of the first reset spring (701) is connected to the guide sleeve (102), and the lower end is connected to the guide rod (7) or the lower plate (2). The upper plate (1) is provided with a through hole, and the guide sleeve (102) passes through the through hole. The upper plate (1) can move up and down relative to the guide rod (7).

4. The tooling for riveting starter stator clamping plates as described in claim 3, characterized in that: A gasket (101) is provided at the upper end of the guide rod (7).

5. The tooling for riveting starter stator clamping plates as described in claim 1, characterized in that: The elastic reset mechanism includes a second reset spring (704), and the guide rod (7) includes an upper rod (702) and a lower rod (703). The lower rod (703) has a cavity for placing the second reset spring (704). The lower end of the second reset spring (704) is connected to the bottom of the cavity, and the upper end is connected to the lower end of the upper rod (702). The upper rod (702) is inserted into the cavity of the lower rod (703).

6. The tooling for riveting starter stator clamping plates as described in claim 1, characterized in that: The lower surface of the upper plate (1) is provided with a first limiting post (8), and the upper surface of the lower plate (2) is provided with a second limiting post (9). The first limiting post (8) and the second limiting post (9) are opposite to each other.

7. A riveting method, characterized in that: The tooling used for riveting starter stator clamping plates as described in any one of claims 1-6 includes the following steps: The pressure plate (10) is placed on the rivet plate (603) with the opening of the pressure plate (10) facing upward; the stator assembly is placed in the groove of the carcass (3) and the enameled wire (11) of the lead wire on the stator assembly is placed in the opening of the pressure plate (10); Start the press and press down the upper plate (1) to move the upper plate (1) downward, thereby driving the first punch (4) and the second punch (5) to move downward until the first end of the pressure piece (10) contacts the first bending surface (402). The first bending surface (402) bends the first end of the pressure piece (10). Continue to press down the upper plate (1) and under the action of the first riveting surface (403), the first end of the pressure piece (10) presses down on the enameled wire (11). Continue pressing down on the upper plate (1), compressing the rivet spring (405) to keep the first punch (4) stationary, while the second punch (5) moves downward until the second end of the pressure piece (10) contacts the second bending surface (502). The second bending surface (502) bends the second end of the pressure piece (10). Continue pressing down on the upper plate (1), and under the action of the second rivet surface (503), the second end of the pressure piece (10) presses against the second end of the pressure piece (10). Release the press, and the elastic reset mechanism returns the upper plate (1) to its initial position.

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