Multi-station spring stamping method and stamping forming device

Abstract

The invention relates to the technical field of volute spiral spring stamping forming manufacturing, in particular to a multi-station spring stamping method and a stamping forming device. Comprising a conveying material belt, one side of the conveying material belt in the width direction is connected with a set of elastic pieces, the elastic pieces are arranged at equal intervals in the length direction of the conveying material belt, and each elastic piece comprises a plate body, a connecting plate and an extending plate; the stamping module comprises a front-end stamping module, a rear-end stamping module, a rear-end stamping module, a rear-end stamping module, a rear-end stamping module, an upper-end stamping module and a lower-end stamping module which are sequentially arranged in the conveying direction of the conveying material belt, the winding punching module comprises a forming punch moving in the extending direction of the plate body, and the forming punch is used for punching the plate body into a wound spring body from one side of the extending plate; the tail end stamping module is used for stamping the connecting plate to form a connecting seat; and the discharging module is used for separating the elastic sheet and the conveying material belt. A traditional step-by-step and discrete special-shaped volute spiral spring machining mode is changed, the production efficiency is improved, and the special-shaped volute spiral spring machining method is suitable for mass production.

Description

Technical Field

[0001] This invention relates to the field of spiral spring stamping manufacturing technology, specifically to a multi-station spring stamping method and stamping apparatus. Background Technology

[0002] As a mechanical component capable of storing and releasing angular energy, spiral springs are widely used in tensioning, resetting, and energy storage mechanisms in many fields such as automobiles, home appliances, and office equipment. With the increasing complexity and precision of industrial product design, higher demands are being placed on the performance and structure of spiral springs, leading to the emergence of numerous non-standard spiral springs. These springs typically feature non-standard connection structures at one or both ends of their spring body, such as: connecting seats for fixing, connecting plates with specific mounting holes, or irregularly shaped ends that directly mesh with other components.

[0003] Currently, the manufacturing of traditional (general-purpose) spiral springs commonly employs spring coiling machines. The process involves continuously feeding a steel strip of a certain width along its length and then winding it into a spiral shape using a bending cutter or mandrel facing the feeding direction. For example, Chinese invention patent application number 202510537016.4 discloses a steel strip winding device and its winding forming method. However, this traditional forming method has significant limitations: its processing focus is entirely concentrated on the winding of the spring itself, and it cannot perform complex irregular stamping processing on the ends of the spring during continuous production.

[0004] Therefore, when faced with the production needs of the aforementioned irregularly shaped spiral springs, existing technologies are usually forced to adopt a discrete "step-by-step processing" mode. That is, the spring body is first wound out using a spring coiling machine, and then the ends of the spring are processed secondary or even multiple times using additional punching machines, milling machines, or special fixtures to form the required connecting seat or connecting plate. This production method has the inherent drawback of low automation leading to low production efficiency. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a multi-station spring stamping forming device, which changes the traditional step-by-step and discrete processing mode of irregular spiral springs, improves production efficiency, and is suitable for mass production.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: A multi-station spring stamping forming device: comprising: A conveyor belt, with a set of spring clips connected to one side of the conveyor belt in the width direction. The set of spring clips is arranged at equal intervals along the length direction of the conveyor belt. Each spring clip includes a plate body, a connecting plate, and an extension plate. The connecting plate is connected to the conveyor belt, and the plate body is disposed between the connecting plate and the extension plate. A stamping module, comprising: [list of components] arranged sequentially along the conveying direction of the conveyor belt. The front stamping module includes a pair of front punches located at the upper and lower ends of the spring sheet, which are used to bend the extension plate toward the plate body; the winding stamping module includes a forming punch that moves along the extension direction of the plate body, which is used to stamp the plate body into a wound spring body from one side of the extension plate; the tail stamping module is used to stamp a connecting plate to form a connecting seat; and the unloading module is used to separate the spring sheet and the conveyor belt.

[0007] Furthermore, in a multi-station spring stamping forming apparatus of this application, the extension plate includes an integrally connected connecting hole plate and a pre-bending plate, the pre-bending plate being connected to the end of the plate body, and the connecting hole plate being located on the outer side in the width direction of the plate body; the front stamping module also includes a pair of hole plate punches located at the upper and lower ends of the spring sheet, the hole plate punches being located at the front end of the front punch, the hole plate punches being used to bend the connecting hole plate toward the pre-bending plate, and the front punches being used to bend the pre-bending plate toward the plate body.

[0008] Based on the above device, a connecting hole plate extending outwards along the width direction of the spring body can be formed on the extension plate at the end of the spring body. The connecting hole plate is bent towards the pre-bending plate. Specifically, after bending, the connecting hole plate is perpendicular to the plate body. After stamping, the spring can be installed and positioned by screws passing through the connecting hole plate during use. In this application, only by setting the hole plate punch at the front end of the front punch can the movement directions of the front punch and the hole plate punch be aligned. This allows the front punch and the hole plate punch to be integrated onto a pair of vertically moving front drive blocks, improving space compactness and driver utilization efficiency while saving hardware costs.

[0009] Furthermore, the multi-station spring stamping forming apparatus of this application further includes a winding stamping module: The winding forming slider moves linearly along the extension direction of the plate to be stamped, with the winding forming slider facing the front end of the plate, and the forming punch is set on the winding forming slider. An auxiliary forming slider includes a pair of forming limiting heads located at the front end of the forming punch. The plate to be stamped is located between the pair of forming limiting heads in the thickness direction. One end of the spring sheet near the forming slider protrudes outside the pair of forming limiting heads. A discharge gap is provided between the forming limiting heads and the forming punch. The conveyor belt passes between a pair of forming limit heads. The conveyor belt moves in the extension direction of the conveyor belt so that each spring piece enters between the pair of forming limit heads in sequence for stamping.

[0010] Based on the above structure, the principle of a multi-station spring stamping forming device is as follows: During the stamping process, the winding forming slider drives the forming punch to move along the extension direction of the plate. After the forming punch contacts the plate, it is used to bend the plate exposed outside a pair of forming limiting heads. The auxiliary forming slider is used to drive the forming limiting heads to move with the forming punch. During this process, the plate is continuously bent and wound to form a spring. When the winding forming slider moves forward, it drives the forming punch to advance synchronously. After contacting the front end of the plate, it applies pressure to deform the plate. The forming limiting heads of the auxiliary forming slider constrain the deformation position of the spring sheet to ensure the stability of the winding trajectory.

[0011] Furthermore, in the multi-station spring stamping forming apparatus of this application, the winding stamping module further includes a gap adjustment mechanism, which is connected to the forming punch in a transmission manner; the gap adjustment mechanism is used to adjust the width of the discharge gap to adjust the gap between the winding layers of the spring body. The gap adjustment mechanism includes a guide block and a transmission frame. The transmission frame is rotatably mounted on the winding forming slider, and the forming punch is mounted on the transmission frame. The transmission frame has a sliding connection part, and the guide block has a slide rail that cooperates with the sliding connection part. As a preferred embodiment of this application, as the winding forming slider continues to move forward, the gap adjustment mechanism dynamically adjusts the width of the discharge gap according to preset parameters, controlling the gap change between the winding layers of the spring body to adapt to the design parameters. Throughout the process, the plate body is gradually spirally wound under the synergistic action of the forming punch and the forming limiting head, ultimately forming the required spring body. This design has the advantages of compact structure and high degree of automation.

[0012] Based on the above structure, during the movement of the forming punch driven by the winding forming slider, the transmission frame rotates due to the guidance of the slide rail and the sliding connection, causing the forming punch to oscillate at a preset amplitude. This adjusts the relative position between the forming punch and the forming limit head, thereby achieving dynamic adjustment of the discharge gap. This dynamic adjustment mechanism allows the discharge gap to change in real time according to the stamping stroke, thereby controlling the gap between each layer during the spring winding process, ensuring that the product meets design requirements and improving forming accuracy and stability.

[0013] Furthermore, in a multi-station spring stamping forming apparatus of this application, the front end of the winding forming slider is provided with a driving surface that abuts against the auxiliary forming slider. The winding stamping module also includes a first linear drive device and a drive cylinder. The first linear drive device is drivenly connected to the winding forming slider, and the drive cylinder is drivenly connected to the auxiliary forming slider. In the reset state, the drive cylinder is used to apply a preset pressure to the auxiliary forming slider to keep the auxiliary forming slider extending towards the winding forming slider. During the stamping process, the driving force of the first linear drive device is greater than the preset pressure, so as to push the auxiliary forming slider to move synchronously with the winding forming slider through the abutment of the driving surface against the auxiliary forming slider. In this process, the drive cylinder acts as a spring to ensure stable contact between the winding forming slider and the auxiliary forming slider. As a preferred embodiment of this application, based on the above structure, the reliability of the synchronous movement of the auxiliary forming slider and the winding forming slider can be guaranteed, and it has the advantage of simple control. When the stamping is completed, the first linear drive device and the drive cylinder need to be reset one after the other. After the first linear drive device is reset, the spring body must be moved out between a pair of forming limit heads, and then the drive cylinder is controlled to be reset, so as to avoid interference between the auxiliary forming slider and the spring body during the synchronous reset process.

[0014] Furthermore, in a multi-station spring stamping forming device of this application, the length direction of the plate body and the connecting plate as a whole is inclined to the length direction of the conveyor belt, and the connecting seat is provided with a cavity. It also includes a base, with the tail stamping module mounted on the base; The tail stamping module includes: A pair of pre-bending punches facing each other, which can move up and down to meet on both sides of the connecting plate, in order to pre-bend part of the connecting plate into a U-shaped structure corresponding to the shape of the cavity. The inner core rod located at the rear end of the pre-bending punch, and the upper and lower outer forming punches facing each other, can move up and down to engage to press the connecting plate into a connecting seat. During this process, the inner core rod passes through the cavity to support the inner wall of the cavity, so as to ensure the shape quality of the cavity. The inner core moving seat is slidably provided inside the seat. The sliding direction of the inner core moving seat is parallel to the extension direction of the inner core rod. The sliding direction of the inner core moving seat corresponds to the width direction of the connecting plate. The corresponding inner core rod is installed on the inner core moving seat.

[0015] Furthermore, in a multi-station spring stamping forming device of this application, a transmission link is rotatably connected to the inner core moving seat, and the transmission link is rotatably connected to the seat body. The first linear drive device includes a linearly moving drive plate, a winding forming slider mounted on the drive plate, a drive slider on the drive plate, a transmission groove on the drive slider, and a guide post at the end of the transmission connecting rod away from the inner core moving seat that slides in cooperation with the transmission groove. As a preferred embodiment of this application, based on the above structure, when the drive plate drives the winding forming slider to press the spring sheet of the winding layer set in the winding stamping module, simultaneously, the drive plate drives the drive slider to move to control the position of the inner core rod. Compared to using two drive devices to control the movement of the inner core rod and the winding forming slider separately, each station can achieve stable synchronous operation, thereby improving work efficiency and reducing hardware costs. Specifically, the drive slider sequentially drives the inner core rod to reciprocate through the transmission groove, guide post, transmission connecting rod, and inner core moving seat. During the forming process of the connecting seat, the inner core rod moves to the position of penetrating the cavity. After the connecting seat is stamped, the inner core rod returns to the outside of the cavity with the inner core moving seat to prevent interference of the conveyor belt during transport.

[0016] Furthermore, in a multi-station spring stamping forming device of this application, a set of connecting plates is provided on one side of the conveyor belt near the spring sheet. Each connecting plate is located between an adjacent pair of spring sheets. The connecting plates are provided with connecting extensions on both sides corresponding to the length direction of the conveyor belt. The connecting extensions on both sides of each connecting plate are respectively connected to an adjacent pair of connecting plates. The unloading module includes a vertically moving punch head, with its cutting edge facing a pair of connecting extensions. As a preferred embodiment of this application, based on the above device, during the separation operation, the punch head can cut off a pair of connecting extensions at once. At this time, the foremost spring (i.e., the spring connected to the front connecting extension) is completely separated from the conveyor belt, while the spring connected to the rear connecting extension remains connected to the other connecting extension. By moving the conveyor belt again, the spring with the cut connecting extension is moved to the foremost position, and the separation operation is performed again. This cycle repeats, achieving the goal of separating the springs one by one. Its advantages lie in effectively controlling the separation rhythm, ensuring that only a single workpiece is separated each time, avoiding continuous miscutting or missed cutting, improving the safety and controllability of the operation, and ensuring the continuity and stability of the production process.

[0017] A multi-station spring stamping forming method, based on the above-mentioned multi-station spring stamping forming apparatus: The moving conveyor belt sequentially feeds the spring sheets into the front stamping module, the winding stamping module, the tail stamping module, and the unloading module, and performs the following operations on each spring sheet in sequence: The perforated plate is punched, and the perforated plate punch is activated to bend the connecting perforated plate toward the pre-bending plate; The pre-bent plate is stamped by starting the front punch, which bends the pre-bent plate toward the plate body. Spring coiling stamping: The coiling forming slider drives the forming punch to move along the extension direction of the plate to bend the plate into a coiled spring body. During the stamping process, the driving surface abuts against the auxiliary forming slider, pushing the auxiliary forming slider to move synchronously with the coiling forming slider. The connecting plate is pre-stamped, and the pre-bending punch is activated to pre-bend part of the connecting plate into a U-shaped structure. The connecting seat is formed by stamping. The upper and lower outer forming punches move up and down to press the connecting plate into a connecting seat. During this process, the inner core rod passes through the cavity to support the inner wall of the cavity. At this time, the spring forms the product spring. After the spring reaches the stamping station, the inner core moving seat drives the inner core rod to move to the position of passing through the cavity. After the forming of the connecting seat is completed, the inner core rod returns to the outside of the cavity with the inner core moving seat to prevent the conveyor belt from interfering during the conveying process. Separate stamping: The punching head starts and cuts off the connecting extension connected to the connecting plate, thus separating the product spring from the conveyor belt.

[0018] As can be seen from the above technical solution, the present invention has the following beneficial effects: Traditional spring coiling machines primarily focus on coiling the spring itself, making it difficult to simultaneously form complex connecting structures (such as connecting seats, connecting plates at specific angles, etc.) at both ends of the spring. This application presents a multi-station spring stamping forming device that, through the collaborative division of labor among a front-end stamping module, a winding stamping module, and a tail-end stamping module, first pre-bends the extension plate, then coils the main body, and finally finishes the connecting plate, thus solving the core technical bottleneck of integral forming of irregularly shaped springs. This device uses a conveyor belt with pre-formed spring sheets as the processing carrier, and through integrated stamping modules, completes all processes such as bending, winding, tail-end forming, and unloading sequentially on a continuous stamping production line. This changes the traditional step-by-step, discrete processing mode, improves production efficiency, and is suitable for mass production. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a multi-station spring stamping forming device according to an embodiment of this application; Figure 2 for Figure 1 A magnified view of a portion of area A in the center circle; Figure 3 This is a schematic diagram of the front-end stamping module in the embodiments of this application; Figure 4 for Figure 3 A schematic diagram of the stamping process in the front-end stamping module; Figure 5 for Figure 4 Enlarged view of a portion of area B within the Chinese box; Figure 6 for Figure 5 The diagram of the punch located below is omitted. Figure 7 This is a schematic diagram showing the stamping deformation sequence of the spring sheet after passing through the front stamping module; Figure 8 This is a schematic diagram of the structure of the winding stamping module and the tail stamping module in the embodiments of this application; Figure 9 for Figure 8 A schematic diagram of the structure behind the hidden base; Figure 10 This is a schematic diagram showing the stamping deformation sequence of the spring sheet through the winding stamping module and the tail stamping module; Figure 11 for Figure 8 A top plan view of the structure in the image; Figure 12 for Figure 11 A cross-sectional view corresponding to the CC direction; Figure 13 for Figure 11 A cross-sectional view corresponding to the DD direction; Figure 14 This is a schematic diagram illustrating the working principle of the winding and stamping module in the embodiments of this application. Figure 1 (The driver board is in reset state); Figure 15 This is a schematic diagram illustrating the working principle of the winding and stamping module in the embodiments of this application. Figure 2 ; Figure 16 This is a schematic diagram illustrating the working principle of the winding and stamping module in the embodiments of this application. Figure 3 (The driver board moves to the frontmost position); Figure 17 for Figure 16 A magnified view of a portion of area E in the center circle; Figure 18 This is a schematic diagram of the stamping principle of the tail stamping module in the embodiments of this application; Figure 19 for Figure 18 A magnified view of a portion of region F in the center circle; Figure 20 This is a schematic diagram showing the positional relationship between the inner core rod and the spring piece when the drive board is in the reset state. Figure 21 This is a schematic diagram showing the positional relationship between the inner core rod and the spring piece when the drive board moves to the frontmost position. Figure 22 for Figure 1 Exploded view of the components of the feeding module; Figure 23 for Figure 22 A magnified view of a portion of the central area G; Figure 24 This is a schematic diagram of the stamping deformation of the spring sheet in the feeding module.

[0020] In the picture: 1-Front-end stamping module; 11-Front-end punch; 12-Perforated plate punch; 13-Front-end drive block; 2-Winding and stamping module; 21-Winding forming slider; 211-Drive surface; 22-Forming punch; 220-Discharge gap; 23-Auxiliary forming slider; 231-Forming limit head; 241-Guide block; 242-Transmission frame; 2421-Guide roller; 244-Gap adjustment guide surface; 245-Avoidance limit groove; 25-First linear drive device; 251-Drive plate; 252-Drive slider; 2520-Transmission groove; 26-Drive cylinder; 3-Tail-end stamping module; 31-Pre-bending punch; 32-Outer forming upper punch; 320-Upper limit arc groove; 321-Support part; 33-Outer forming lower punch; 331-Floating punch; 332-Limit punch; 3320-Lower limit arc groove; 34-Inner core rod; 341-Inner core moving seat; 35-Transmission connecting rod; 350-Pivot; 351-Guide post; 36-Lower moving block; 361-Elastic element; 4-Base; 41-Moving slot; 5- Feeding module; 51- Punching head; 52- Guide slide; 8-Conveyor belt; 81-Connecting piece; 82-Connecting extension; 9-Spring piece; 900-Plate body; 901-Spring body; 902-Connecting plate; 9021-U-shaped structure; 903-Connecting seat; 9030-Cavity; 91-Extension plate; 911-Connecting hole plate; 912-Pre-bent plate. Detailed Implementation

[0021] Example 1 In this embodiment, as shown... Figure 1 The present invention provides a multi-station spring stamping forming apparatus, comprising: like Figure 2 The conveyor belt 8 shown has a set of spring pieces 9 connected to one side of its width direction. The set of spring pieces 9 are arranged at equal intervals along the length direction of the conveyor belt 8. Each spring piece 9 includes a straight-extending plate body 900, a connecting plate 902, and an extension plate 91. The connecting plate 902 is connected to the conveyor belt 8, and the plate body 900 is disposed between the connecting plate 902 and the extension plate 91. The stamping module comprises the following components arranged sequentially along the conveying direction of the conveyor belt 8: Front-end stamping module 1, such as Figure 3 and Figure 4 As shown, it includes a pair of front punches 11 located at the upper and lower ends of the spring piece 9, as... Figure 7 As shown, the front punch 11 is used to bend the extension plate 91 toward the plate body 900; Winding and stamping module 2, such as Figure 9 As shown, it includes a forming punch 22 that moves along the extension direction of the plate body 900, such as Figure 10 As shown, the forming punch 22 is used to press the plate 900 into a coiled spring body 901 from one side of the extension plate 91; Tail-end stamping module 3, such as Figure 10 As shown, it is used to stamp the connecting plate 902 to form the connecting seat 903; Material feeding module 5, such as Figure 24 As shown, it is used to separate the spring 9 and the conveyor belt 8.

[0022] Furthermore, in this embodiment, as Figure 2 As shown, the extension plate 91 includes an integrally connected connecting hole plate 911 and a pre-bent plate 912. The pre-bent plate 912 is connected to the end of the plate body 900, and the connecting hole plate 911 is located on the outer side of the width direction of the plate body 900. like Figures 4 to 6 As shown, the front stamping module 1 also includes a pair of perforated punches 12 located at the upper and lower ends of the spring sheet 9. The perforated punches 12 are located at the front end of the front punch 11. The perforated punches 12 are used to bend the connecting perforated plate 911 toward the pre-bending plate 912, and the front punch 11 is used to bend the pre-bending plate 912 toward the plate body 900. Based on the above device, a connecting perforated plate 911 extending to one side of the width direction of the spring body 901 can be formed on the extension plate 91 at the end of the spring body 901, and the connecting perforated plate 911 is bent toward the pre-bending plate 912. Specifically, after bending, the connecting perforated plate 911 is perpendicular to the plate body 900. When the stamped spring is used, it can be installed and positioned by screws passing through the connecting perforated plate 911. In this application, only by setting the perforated plate punch 12 at the front end of the front end punch 11 can the moving directions of the front end punch 11 and the perforated plate punch 12 be consistent, thereby enabling the front end punch 11 and the perforated plate punch 12 to be integrated on a pair of up-and-down moving front end drive blocks 13, so as to improve space compactness and improve driver utilization efficiency and save hardware costs.

[0023] Specifically, such as Figure 5 As shown, the front punch 11 and the perforated punch 12 are each provided in two sets in the conveying direction of the conveyor belt 8. The front set is used for pre-bending, and the rear set is used for forming.

[0024] Furthermore, in this embodiment, combined with Figures 8 to 12 As shown, the winding and stamping module 2 also includes: The winding forming slider 21 moves linearly along the extension direction of the plate 900 to be stamped. The winding forming slider 21 is directly opposite the front end of the plate 900, and the forming punch 22 is disposed on the winding forming slider 21. The auxiliary forming slider 23 includes a pair of forming limiting heads 231 located at the front end of the forming punch 22. The plate body 900 to be stamped is located between the pair of forming limiting heads 231 in the thickness direction. One end of the spring sheet near the forming slider 21 is exposed outside the pair of forming limiting heads 231. A discharge gap 220 is provided between the forming limiting head 231 and the forming punch 22. The conveyor belt 8 passes between a pair of forming limit heads 231. The conveyor belt 8 moves in the extension direction of the conveyor belt 8 so that each spring piece enters between a pair of forming limit heads 231 in sequence for stamping.

[0025] During the stamping process, the winding forming slider 21 drives the forming punch 22 to move along the extension direction of the plate 900. After the forming punch 22 contacts the plate 900, it is used to bend the plate 900 exposed outside the pair of forming limiting heads 231. The auxiliary forming slider 23 is used to drive the forming limiting heads 231 to move with the forming punch 22. During this process, the plate 900 is continuously bent and wound to form the spring body 901. When the winding forming slider 21 moves forward, it drives the forming punch 22 to advance synchronously. After contacting the front end of the plate 900, it applies pressure to deform it. The forming limiting heads 231 of the auxiliary forming slider 23 constrain the deformation position of the spring piece to ensure the stability of the winding trajectory.

[0026] Furthermore, in combination Figures 14 to 16 As shown, in this embodiment, the winding and stamping module 2 further includes a gap adjustment mechanism, which is connected to the forming punch 22 in a driving manner. The gap adjustment mechanism is used to adjust the width of the discharge gap 220 to adjust the gap between the winding layers of the spring body 901. The gap adjustment mechanism includes a guide block 241 and a transmission frame 242. The transmission frame 242 is rotatably mounted on the winding and forming slider 21, and the forming punch 22 is mounted on the transmission frame 242. The transmission frame 242 is provided with a sliding connection part, and the guide block 241 is provided with a slide rail that cooperates with the sliding connection part. As the winding and forming slider 21 continues to move forward, the gap adjustment mechanism dynamically adjusts the width of the discharge gap 220 according to preset parameters, controlling the change in the gap between the winding layers of the spring body 901 to adapt to the design parameters. Throughout the process, the plate body 900 is gradually spirally wound under the synergistic action of the forming punch 22 and the forming limiting head 231, finally forming the required spring body 901, which has the advantages of compact structure and high degree of automation. During the process of the winding forming slider 21 pushing the forming punch 22 to move, the transmission frame 242 rotates due to the guidance of the slide rail and the sliding connection, causing the forming punch 22 to swing at a preset amplitude. This adjusts the relative position between the forming punch 22 and the forming limit head 231, thereby achieving dynamic adjustment of the discharge gap 220. This dynamic adjustment mechanism allows the discharge gap 220 to change in real time according to the stamping stroke, thereby controlling the gap between each layer during the spring winding process, ensuring that the product meets design requirements and improving forming accuracy and stability.

[0027] Specifically, in this embodiment, the slide is a gap-adjusting guide surface 244 located on the guide block 241 near the transmission frame 242. The sliding connection abuts against the gap-adjusting guide surface 244. An elastic element (not shown) is connected to the transmission frame 242 to apply elastic force to the transmission frame 242 to keep the sliding connection always in contact with the gap-adjusting guide surface 244. Based on the above structure, the preload of the elastic element ensures that the sliding connection and the gap-adjusting guide surface 244 always maintain stable contact, avoiding contact failure due to vibration or speed changes, thereby ensuring the continuity and accuracy of the swinging motion. Specifically, in one embodiment, the elastic element is a torsion spring (not shown). A pair of pins of the torsion spring are respectively connected to the wound forming slider 21 and the transmission frame 242 to apply a torque to the transmission frame 242 to press the sliding connection against the gap-adjusting guide surface 244.

[0028] In this embodiment, the sliding connection is a guide roller 2421 rotatably mounted on the transmission frame 242, and the guide block 241 is located above the guide roller 2421. The gap adjustment guide surface 244 gradually tilts upward in the direction in which the winding forming slider 21 moves toward the auxiliary forming slider 23. This enables gradual control of the gap between the winding layers of the spring body 901, with the inner layer being denser and the outer layer being sparser.

[0029] Furthermore, the forming punch 22 is a stamping roller rotatably mounted on the transmission frame 242, and the axis of the stamping roller is always located on the upper side of the plate 900. This ensures that the front end of the plate 900 can be stably wound around the lower side of the plate 900 during the stamping process.

[0030] Furthermore, in this embodiment, the guide block 241 is provided with an avoidance limiting groove 245. The avoidance limiting groove 245 is located at the end of the gap adjustment guide surface 244 away from the auxiliary forming slider 23. When the winding forming slider 21 is in the reset state, the guide roller 2421 is located in the avoidance limiting groove 245. When the winding forming slider 21 is reset, the forming punch 22 needs to move backward to make room for the spring sheet to move along the conveyor belt 8. The traditional approach is to directly pull the winding forming slider 21 backward to make room, which will result in an excessively long reset stroke of the winding forming slider 21, resulting in poor spatial compactness of the device. By setting the avoidance limiting groove 245, and utilizing the cooperation between the guide roller 2421 and the avoidance limiting groove 245, when the winding forming slider 21 is reset, the forming punch 22 swings backward with the transmission frame 242 to make room for the spring sheet to feed, thereby shortening the moving stroke of the winding forming slider 21 and effectively improving the structural compactness and operational reliability.

[0031] In this embodiment, the front end of the winding forming slider 21 is provided with a driving surface 211 that abuts against the auxiliary forming slider 23. The winding stamping module 2 also includes a first linear drive device 25 and a drive cylinder 26. The first linear drive device 25 is drivenly connected to the winding forming slider 21, and the drive cylinder 26 is drivenly connected to the auxiliary forming slider 23. In the reset state, the drive cylinder 26 is used to apply a preset pressure to the auxiliary forming slider 23 to keep the auxiliary forming slider 23 extending towards one end of the winding forming slider 21. During the stamping process, the driving force of the first linear drive device 25 is greater than the preset pressure, so that the auxiliary forming slider 23 is pushed to move synchronously with the winding forming slider 21 through the abutment of the driving surface 211 against the auxiliary forming slider 23. During this process, the drive cylinder 26 acts as a spring to ensure stable contact between the winding forming slider 21 and the auxiliary forming slider 23. Based on the above structure, the reliability of the synchronous movement of the auxiliary forming slider 23 and the winding forming slider 21 can be guaranteed, and it has the advantage of simple control. When the stamping is completed, the first linear drive device 25 and the drive cylinder 26 need to be reset one after the other. After the first linear drive device 25 is reset, the spring body 901 must be moved out between the pair of forming limit heads 231, and then the drive cylinder 26 is controlled to be reset, so as to avoid interference between the auxiliary forming slider 23 and the spring body 901 during the synchronous reset process.

[0032] In this embodiment, combined with Figures 17 to 21 As shown, the length direction of the plate 900 and the connecting plate 902 is inclined to the length direction of the conveyor belt 8 (i.e., the plate 900 and the connecting plate 902 are not perpendicular to the length direction of the conveyor belt 8), and the connecting seat 903 is provided with a cavity 9030; it also includes a seat 4, and the winding stamping module 2 and the tail stamping module 3 are disposed on the seat 4, combined with Figure 13 As shown, the base 4 is provided with a moving groove 41 for receiving and moving the conveyor belt 8, the winding forming slider 21 and the auxiliary forming slider 23 are slidably disposed on the base 4, and the guide block 241 is installed on the base 4. Tail-end stamping module 3 includes: A pair of pre-bending punches 31 facing each other vertically. The pair of pre-bending punches 31 can move up and down to engage with both sides of the connecting plate 902, so as to pre-bend part of the connecting plate 902 into a U-shaped structure 9021 corresponding to the shape of the cavity 9030. The inner core rod 34 located at the rear end of the pre-bending punch 31, and the upper outer forming punch 32 and the lower outer forming punch 33 facing each other, can move up and down to engage to press the connecting plate 902 into the connecting seat 903. During this process, the inner core rod 34 passes through the cavity 9030 to support the inner wall of the cavity 9030, so as to ensure the shape quality of the cavity 9030. The inner core moving seat 341 is slidably provided inside the seat body 4. The sliding direction of the inner core moving seat 341 is parallel to the extension direction of the inner core rod 34. The sliding direction of the inner core moving seat 341 corresponds to the width direction of the connecting plate 902. The corresponding inner core rod 34 is installed on the inner core moving seat 341.

[0033] Furthermore, in this embodiment, a transmission link 35 is rotatably connected to the inner core moving seat 341, and the transmission link 35 is rotatably connected to the seat body 4 via a pivot 350; The first linear drive device 25 includes a linearly moving drive plate 251, a winding forming slider 21 mounted on the drive plate 251, a drive slider 252 on the drive plate 251, a transmission groove 2520 on the drive slider 252, and a guide post 351 that slides with the transmission groove 2520 at one end of the transmission connecting rod 35 away from the inner core moving seat 341. The guide post 351 is cylindrical in shape.

[0034] Based on the above structure, when the drive plate 251 drives the winding forming slider 21 to move and stamp the spring sheet of the winding layer set in the winding stamping module 2, the drive plate 251 simultaneously drives the drive slider 252 to move to control the position of the inner core rod 34. Compared with using two drive devices to control the movement of the inner core rod 34 and the winding forming slider 21 respectively, each station can achieve stable synchronous operation, thereby improving work efficiency and reducing hardware costs. Specifically, the drive slider 252 drives the inner core rod 34 to reciprocate through the transmission groove 2520, guide post 351, transmission connecting rod 35, and inner core moving seat 341 in sequence. During the forming process of the connecting seat 903, the inner core rod 34 moves to the position of penetrating the cavity 9030. After the connecting seat 903 is stamped, the inner core rod 34 returns to the outside of the cavity 9030 with the inner core moving seat 341 to prevent interference from the conveyor belt 8 during the conveying process.

[0035] Furthermore, in combination Figure 18 and Figure 19As shown, in this embodiment, the tail-end stamping module 3 includes a lower moving block 36, and an outer forming lower punch 33 is mounted on the lower moving block 36. The outer forming lower punch 33 includes a floating punch 331 and a limiting punch 332 adjacent to one side of the floating punch 331. The floating punch 331 is floatingly mounted on the lower moving block 36. An elastic element 361 is provided on the lower moving block 36 corresponding to the bottom of the floating punch 331. The floating punch 331 faces the bottom of the U-shaped structure 9021. The limiting punch 332 is provided with a lower limiting arc groove 3320, and the outer forming upper punch 32 is provided with an upper limiting arc groove corresponding to the lower limiting arc groove 3320. 320; When the outer forming upper punch 32 and outer forming lower punch 33 open and reset, the floating punch 331 protrudes upward from the lower limit arc groove 3320; during the process of the outer forming upper punch 32 and outer forming lower punch 33 moving to engage, the floating punch 331 first contacts the U-shaped structure 9021 and pushes the U-shaped structure 9021 to bend. During the bending process, the outer side of the U-shaped structure 9021 is guided and slid by the lower limit arc groove 3320 and the upper limit arc groove 320 in sequence to rotate around the inner core rod 34, finally forming the connecting seat 903. During this process, the limiting elastic element 361 of the inner core rod 34 is compressed. When the outer forming upper punch 32 and outer forming lower punch 33 engage, the outer forming upper punch 32 and the limiting punch 332 abut against each other vertically. Based on the above device, precise control of the bending and forming of the connecting seat 903 can be achieved. Specifically, the upper pre-bending punch 31 and the outer forming upper punch 32 share a lifting drive device, while the lower pre-bending punch 31 and the outer forming lower punch 33 share another lifting drive device.

[0036] To prevent the inner core rod 34 from bending during the stamping process of the connecting seat 903, a support part 321 is provided on one side of the outer forming upper punch 32. When the inner core rod 34 moves to the position of passing through the cavity 9030, the front end of the inner core rod 34 is exposed outside the cavity 9030. When the outer forming upper punch 32 and the outer forming lower punch 33 are engaged, the support part 321 abuts against the front end of the inner core rod 34 exposed outside the cavity 9030. At this time, the support part 321 and the inner core moving seat 341 support the two ends of the inner core rod 34 respectively, which can effectively prevent the floating punch 331 from bending the inner core rod 34.

[0037] Furthermore, in this embodiment, combined with Figure 2 A set of connecting pieces 81 is provided on one side of the conveyor belt 8 near the spring sheet 9. Each connecting piece 81 is located between an adjacent pair of spring sheets 9. Connecting extensions 82 are provided on both sides of the connecting piece 81 corresponding to the length direction of the conveyor belt 8. The connecting extensions 82 on both sides of each connecting piece 81 are respectively connected to an adjacent pair of connecting plates 902. Figures 22 to 24As shown, the feeding module 5 includes a vertically movable punch head 51, with the cutting edge of the punch head 51 facing a pair of connecting extensions 82. Based on the above device, during the separation operation, the punch head 51 can cut off a pair of connecting extensions 82 at once. At this time, the foremost spring piece 9 (i.e., the spring piece 9 connected to the front connecting extension 82) is completely separated from the conveyor belt 8, while the spring piece 9 connected to the rear connecting extension 82 is still connected to the other connecting extension 82. By moving the conveyor belt 8 again, the spring piece 9 with the cut connecting extension 82 is moved to the foremost position, and the separation operation is performed again. This cycle is repeated to achieve the purpose of separating the spring pieces 9 one by one. Its advantage is that it can effectively control the separation rhythm, ensuring that only a single workpiece is separated each time, avoiding continuous miscutting or missed cutting, improving the safety and controllability of the operation, and ensuring the continuity and stability of the production process. Specifically, a guide slide 52 is provided at the position corresponding to the cut spring piece 9, and the cut product is transported to a designated collection area through the guide slide 52.

[0038] Example 2 A multi-station spring stamping forming method, based on the multi-station spring stamping forming apparatus of Embodiment 1. The moving conveyor belt 8 sequentially feeds the spring pieces 9 into the front stamping module 1, the winding stamping module 2, the tail stamping module 3, and the unloading module 5, and performs the following operations on each spring piece 9 in sequence: ① Perforated plate punching: The perforated plate punch 12 is activated, bending the connecting perforated plate 911 toward the pre-bending plate 912; ② Pre-bending plate stamping: The front punch 11 is activated to bend the pre-bending plate 912 toward the plate body 900. ③ Spring winding stamping: The winding forming slider 21 drives the forming punch 22 to move along the extension direction of the plate 900 to bend the plate 900 into a coiled spring body 901. During the stamping process, the driving surface 211 abuts against the auxiliary forming slider 23, pushing the auxiliary forming slider 23 to move synchronously with the winding forming slider 21. ④ The connecting plate is pre-stamped, and the pre-bending punch 31 is activated to pre-bend part of the connecting plate 902 into a U-shaped structure 9021; ⑤ The connecting seat is formed by stamping. The upper outer forming punch 32 and the lower outer forming punch 33 move up and down to engage to stamp the connecting plate 902 into the connecting seat 903. During this process, the inner core rod 34 passes through the cavity 9030 to support the inner wall of the cavity 9030. At this time, the spring 9 forms a product spring. After the spring 9 reaches the stamping station, the inner core moving seat 341 drives the inner core rod 34 to move to the position of passing through the cavity 9030. After the forming of the connecting seat 903 is completed, the inner core rod 34 returns to the outside of the cavity 9030 with the inner core moving seat 341 to prevent the conveyor belt 8 from interfering during the conveying process. ⑥ Separate stamping: The punching head 51 is activated to cut off the connecting extension 82 connected to the connecting plate 902 (i.e., connecting seat 903), thereby separating the product spring from the conveyor belt 8.

[0039] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can conceive of other specific embodiments of the invention without creative effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A multi-station spring stamping forming device, characterized in that: include: A conveyor belt (8) is connected to a set of spring pieces (9) on one side of the conveyor belt (8) in the width direction. The spring piece (9) includes a plate body (900), a connecting plate (902) and an extension plate (91). The connecting plate (902) is connected to the conveyor belt (8), and the plate body (900) is disposed between the connecting plate (902) and the extension plate (91). The stamping module comprises, in sequence, components arranged along the conveying direction of the conveyor belt (8): The front stamping module (1) includes a pair of front punches (11) located at the upper and lower ends of the spring sheet (9), the front punches (11) being used to bend the extension plate (91) toward the plate body (900); The winding stamping module (2) includes a forming punch (22) that moves along the extension direction of the plate (900) and the forming punch (22) is used to stamp the plate (900) into a wound spring (901) from one side of the extension plate (91). Tail-end stamping module (3), which is used to stamp the connecting plate (902) to form a connecting seat (903). The unloading module (5) is used to separate the spring sheet (9) and the conveyor belt (8).

2. The multi-station spring stamping forming device according to claim 1, characterized in that: The extension plate (91) includes an integrally connected connecting hole plate (911) and a pre-bent plate (912), the pre-bent plate (912) being connected to the end of the plate body (900), and the connecting hole plate (911) being located on the outer side of the plate body (900) in the width direction; The front stamping module (1) also includes a pair of perforated punches (12) located at the upper and lower ends of the spring sheet (9). The perforated punches (12) are located at the front end of the front punch (11). The perforated punches (12) are used to bend the connecting perforated plate (911) toward the pre-bending plate (912). The front punch (11) is used to bend the pre-bending plate (912) toward the plate body (900).

3. The multi-station spring stamping forming device according to claim 2, characterized in that: The winding and stamping module (2) also includes: The winding forming slider (21) moves linearly along the extension direction of the plate (900) to be stamped. The winding forming slider (21) is directly opposite the front end of the plate (900), and the forming punch (22) is set on the winding forming slider (21). The auxiliary forming slider (23) includes a pair of forming limiting heads (231) located at the front end of the forming punch (22). The plate (900) to be stamped is located between the pair of forming limiting heads (231) in the thickness direction. One end of the spring sheet near the forming slider (21) is exposed outside the pair of forming limiting heads (231). A discharge gap (220) is provided between the forming limiting head (231) and the forming punch (22). The conveyor belt (8) passes between a pair of forming limit heads (231). The conveyor belt (8) is moved in the extension direction of the conveyor belt (8) so that each spring piece enters between a pair of forming limit heads (231) in sequence to be stamped.

4. The multi-station spring stamping forming device according to claim 3, characterized in that: The winding and stamping module (2) also includes a gap adjustment mechanism, which is connected to the forming punch (22) in a transmission manner; the gap adjustment mechanism is used to adjust the width of the discharge gap (220); The gap adjustment mechanism includes a guide block (241) and a transmission frame (242). The transmission frame (242) is rotatably mounted on the winding forming slider (21). The forming punch (22) is mounted on the transmission frame (242). The transmission frame (242) is provided with a sliding connection part. The guide block (241) is provided with a slide that cooperates with the sliding connection part.

5. The multi-station spring stamping forming device according to claim 4, characterized in that: The front end of the winding forming slider (21) is provided with a driving surface (211) that abuts against the auxiliary forming slider (23). The winding stamping module (2) also includes a first linear driving device (25) and a driving cylinder (26). The first linear driving device (25) is connected to the winding forming slider (21) in a transmission manner, and the driving cylinder (26) is connected to the auxiliary forming slider (23) in a transmission manner. In the reset state, the drive cylinder (26) is used to apply a preset pressure to the auxiliary forming slider (23) to keep the auxiliary forming slider (23) extending toward the winding forming slider (21); During the stamping process, the driving force of the first linear drive device (25) is greater than the preset pressure, so that the auxiliary forming slider (23) is pushed to move synchronously with the winding forming slider (21) through the drive surface (211) and the auxiliary forming slider (23).

6. The multi-station spring stamping forming device according to claim 5, characterized in that: The length direction of the plate (900) and the connecting plate (902) is inclined to the length direction of the conveyor belt (8), and the connecting seat (903) is provided with a cavity (9030). It also includes a base (4), and a tail stamping module (3) is set on the base (4); The tail-end stamping module (3) includes: A pair of pre-bending punches (31) facing each other vertically. The pair of pre-bending punches (31) can move up and down to meet the two sides of the connecting plate (902) to pre-bend part of the connecting plate (902) into a U-shaped structure (9021) corresponding to the shape of the cavity (9030). The inner core rod (34) located at the rear end of the pre-bending punch (31) and the upper and lower outer forming punches (32 and 33) facing each other are able to move up and down to engage to press the connecting plate (902) into a connecting seat (903). During this process, the inner core rod (34) passes through the cavity (9030) to support the inner wall of the cavity (9030). The inner core moving seat (341) is slidably provided inside the seat body (4). The sliding direction of the inner core moving seat (341) is parallel to the extension direction of the inner core rod (34). The sliding direction of the inner core moving seat (341) corresponds to the width direction of the connecting plate (902). The corresponding inner core rod (34) is installed on the inner core moving seat (341).

7. The multi-station spring stamping forming device according to claim 6, characterized in that: The inner core moving seat (341) is rotatably connected to a transmission link (35), which is rotatably connected to the seat body (4). The first linear drive device (25) includes a linearly moving drive plate (251), a winding forming slider (21) is mounted on the drive plate (251), a drive slider (252) is provided on the drive plate (251), a transmission groove (2520) is provided on the drive slider (252), and a guide post (351) that slides with the transmission groove (2520) is provided at the end of the transmission link (35) away from the inner core moving seat (341).

8. The multi-station spring stamping forming device according to claim 7, characterized in that: A set of connecting pieces (81) is provided on one side of the conveyor belt (8) near the spring piece (9). Each connecting piece (81) is located between an adjacent pair of spring pieces (9). The connecting pieces (81) are provided with connecting extensions (82) on both sides of the conveyor belt (8) along the length direction. The connecting extensions (82) on both sides of each connecting piece (81) are connected to an adjacent pair of connecting plates (902). The feeding module (5) includes a punching head (51) that moves up and down, with the cutting edge of the punching head (51) facing a pair of connecting extensions (82).

9. A multi-station spring stamping forming method, based on the multi-station spring stamping forming apparatus according to claim 8, characterized in that: The moving conveyor belt (8) sequentially feeds the spring pieces (9) into the front stamping module (1), the winding stamping module (2), the tail stamping module (3), and the unloading module (5), and performs the following operations on each spring piece (9) in sequence: The perforated plate is punched, and the perforated plate punch (12) is started to bend the connecting perforated plate (911) toward the pre-bending plate (912); The pre-bent plate is stamped, and the front punch (11) is activated to bend the pre-bent plate (912) toward the plate body (900); Spring coiling stamping, the coiling forming slider (21) drives the forming punch (22) to move along the extension direction of the plate (900) to bend the plate (900) into a coiled spring body (901). During the stamping process, the driving surface (211) abuts against the auxiliary forming slider (23) and pushes the auxiliary forming slider (23) to move synchronously with the coiling forming slider (21). The connecting plate is pre-stamped, and the pre-bending punch (31) is activated to pre-bend part of the connecting plate (902) into a U-shaped structure (9021). The connecting seat is formed by stamping. The upper punch (32) and the lower punch (33) move up and down to press the connecting plate (902) into the connecting seat (903). During this process, the inner core rod (34) passes through the cavity (9030) to support the inner wall of the cavity (9030). At this time, the spring (9) forms the product spring. After the spring (9) reaches the stamping station, the inner core moving seat (341) drives the inner core rod (34) to move to the position of passing through the cavity (9030). After the forming of the connecting seat (903) is completed, the inner core rod (34) returns to the outside of the cavity (9030) with the inner core moving seat (341). Separate stamping, the punching head (51) is activated, and the connecting extension (82) connected to the connecting plate (902) is broken off, so as to separate the product spring from the conveyor belt (8).

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