Punch forming device for volute spiral spring

Abstract

The invention relates to the technical field of spring stamping manufacturing, in particular to a volute spiral spring stamping forming device. Comprising a winding and stamping module, and the winding and stamping module comprises a winding and forming sliding block which linearly moves in the extending direction of a to-be-stamped plate body, and the winding and forming sliding block right faces the front end of the plate body; the forming punch is arranged on the winding forming sliding block; the auxiliary forming sliding block comprises a pair of forming limiting heads located at the front ends of the forming punches, and discharging gaps are formed between the forming limiting heads and the forming punches; the gap adjusting mechanism is in transmission connection with the forming punch; in the stamping process, the winding forming sliding block drives the forming punch to move in the extending direction of the plate body, the forming punch is used for bending the part, exposed out of the forming limiting heads, of the plate body, the auxiliary forming sliding block is used for driving the forming limiting heads to move along with the forming punch, and in the process, the plate body is continuously bent and wound to form the spring body. The gap adjusting mechanism is used for adjusting the width of the discharging gap so as to adjust the gap between winding layers of the spring body.

Description

Technical Field

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

[0002] Spiral springs, as mechanical components that utilize the elastic deformation of materials to store and release energy, are widely used in tensioning, resetting, and energy storage mechanisms in automobiles, instruments, and home appliances. Their core component is a helical spring body wound from a strip of steel made of a specific material. Traditional spiral spring manufacturing often employs a winding forming process, where the spring sheet (plate) is initially wound on specialized winding equipment. This process has the limitation of not being able to process irregularly shaped springs. To automate the production of irregularly shaped spiral springs, stamping technology has been introduced into their manufacturing. Some existing stamping devices attempt to directly wind a straight spring sheet into the final spring shape in one or several stamping strokes using a punch and die. However, these devices face a key technical bottleneck in practical applications: it is difficult to precisely control the gap (pitch) between adjacent winding layers of the formed spring during continuous stamping and winding.

[0003] During dynamic winding, the gap control of the spring body is crucial, directly determining key performance parameters such as spring stiffness, working stroke, and fatigue life. Improper gap control can lead to unstable spring force characteristics, interlayer interference, or jamming during operation. Traditional fixed-gap stamping dies, once completed, cannot change the discharge gap, limiting production to single-specification, fixed-gap springs and lacking flexible manufacturing capabilities. Producing springs with different gap parameters requires replacing the entire die set or performing complex mechanical adjustments, increasing production costs and severely impacting production efficiency and changeover speed.

[0004] Therefore, developing a mechanism that can dynamically and precisely adjust and control the spring winding gap during the stamping process is key to improving the stamping technology level and equipment adaptability of spiral springs. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a spiral spring stamping forming apparatus, which uses a stamping process to form and manufacture spiral springs, and can control the gap change between the winding layers of the spring body to adapt to design parameters.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: A spiral spring stamping forming apparatus is used to stamp a spring sheet into a coiled spring. Before stamping, the spring sheet includes a linearly extending plate, and after stamping, the coiled spring includes a spring body formed by winding the plate. The apparatus includes a winding stamping module comprising: The winding forming slider moves linearly along the extension direction of the sheet to be stamped, and the winding forming slider is directly opposite the front end of the sheet. A forming punch is mounted on a 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 clearance adjustment mechanism is connected to the forming punch drive; 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 that is exposed outside a pair of forming limit heads. The auxiliary forming slider is used to drive the forming limit heads to move with the forming punch. During this process, the plate is continuously bent and wound to form a spring. 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.

[0007] Furthermore, in this application, a spiral spring stamping forming apparatus includes a gap adjustment mechanism comprising 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 portion, and the guide block has a slide rail that cooperates with the sliding connection portion. As a preferred embodiment of this application, based on the above structure, during the process of the winding forming slider pushing the forming punch to move, the transmission frame rotates due to the guidance of the slide rail and the sliding connection portion, causing the forming punch to oscillate at a preset amplitude. This adjusts the relative position between the forming punch and the forming limiting 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 layers during the spring winding process, ensuring that the product meets design requirements and improving forming accuracy and stability.

[0008] Furthermore, in the spiral spring stamping and forming apparatus of this application, the slide is a clearance adjustment guide surface disposed on the guide block near the transmission frame. The sliding connection part abuts against the clearance adjustment guide surface, and an elastic element is connected to the transmission frame to apply elastic force to the transmission frame to keep the sliding connection part always in contact with the clearance adjustment guide surface. As a preferred embodiment of this application, based on the above structure, the preload of the elastic element ensures that the sliding connection part and the clearance adjustment guide surface always maintain stable contact, avoiding contact failure due to vibration or speed changes, thereby ensuring the continuity and accuracy of the swinging motion.

[0009] Furthermore, in the spiral spring stamping forming apparatus of this application, the sliding connection part is a guide roller rotatably mounted on the transmission frame, the guide block is located above the guide roller, and the gap adjustment guide surface gradually tilts upward in the direction in which the winding forming slider moves toward the auxiliary forming slider. As a preferred embodiment of this application, it is possible to achieve gradual control of the gap between the winding layers of the spring body, with the inner layer being denser and the outer layer being sparser.

[0010] Furthermore, in the spiral spring stamping forming apparatus of this application, the guide block is located above the guide roller, and the forming punch is a stamping roller rotatably mounted on the transmission frame, with the axis of the stamping roller always located on the upper side of the plate. As a preferred embodiment of this application, it can ensure that the front end of the plate can be stably wound around the lower side of the plate during the stamping process.

[0011] Furthermore, in this application, a spiral spring stamping forming apparatus includes a driving surface at the front end of the winding forming slider that abuts against an 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 applies a preset pressure to the auxiliary forming slider to keep it extending towards one end of the winding forming slider. During the stamping process, the driving force of the first linear drive device is greater than the preset pressure, so that the auxiliary forming slider is pushed 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.

[0012] Furthermore, in the spiral spring stamping forming device of this application, the spring pieces are arranged on one side of the width direction of the conveyor belt, and the spring pieces are arranged along the extension direction of the conveyor belt. The conveyor belt passes through a pair of forming limiting heads. The conveyor belt is moved in the extension direction of the conveyor belt so that each spring piece enters between a pair of forming limiting heads in sequence for stamping. The guide block is provided with an avoidance limiting groove, which is located at the end of the gap adjustment guide surface away from the auxiliary forming slider. When the winding forming slider is in the reset state, the guide roller is located in the avoidance limiting groove. As a preferred embodiment of this application, when the winding forming slider is reset, the forming punch needs to move backward to make room for the spring sheet to move along the conveyor belt. The traditional approach is to directly pull the winding forming slider backward to make room, which will result in an excessively long reset stroke of the winding forming slider, resulting in poor spatial compactness of the device. By setting an avoidance limit groove, and using the cooperation between the guide roller and the avoidance limit groove, when the winding forming slider is reset, the forming punch swings backward with the transmission frame to make room for the spring sheet to feed, thereby shortening the moving stroke of the winding forming slider and effectively improving the structural compactness and operational reliability.

[0013] Furthermore, the spiral spring stamping forming device of this application also includes a base, a winding stamping module is disposed on the base, the base is provided with a moving groove for receiving and conveying the material belt, a winding forming slider and an auxiliary forming slider are slidably disposed on the base, and a guide block is mounted on the base.

[0014] Furthermore, in this application, a spiral spring stamping forming apparatus includes a spring sheet comprising a connecting plate located at the tail end of a plate body, and a tail end stamping module for stamping the connecting plate to form a connecting seat. The connecting seat has a cavity. The tail end stamping module is located at the rear end of the winding stamping module. The tail end stamping module includes: a pair of vertically aligned pre-bending punches, which can move vertically to engage with both sides of the connecting plate to pre-bend a portion of the connecting plate into a U-shaped structure corresponding to the shape of the cavity portion; an inner core rod located at the rear end of the pre-bending punches; and vertically aligned upper and lower outer forming punches, which can move vertically to engage with the connecting plate. The connecting seat is stamped into a core rod, which passes through the cavity to support the inner wall of the cavity and ensure the shape quality of the cavity. An inner core moving seat is slidably provided in the seat body. 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 is inclined to the conveying direction of the conveyor belt. The inner core rod is installed on the inner core moving seat. A transmission connecting rod is rotatably connected to the inner core moving seat. The transmission connecting rod is rotatably connected to the seat body. The first linear drive device includes a linearly moving drive plate. A winding forming slider is installed on the drive plate. The drive plate is provided with a drive slider. The drive slider is provided with a transmission groove. The end of the transmission connecting rod away from the inner core moving seat is provided with a guide post that slides 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 move and stamp the spring sheet of the winding layer set in the winding stamping module, the drive plate simultaneously drives the drive slider to move to control the position of the inner core rod. Compared with using two drive devices to control the movement of the inner core rod and the winding forming slider respectively, each station can achieve stable synchronous operation, thereby improving work efficiency and reducing hardware costs. Specifically, the drive slider drives the inner core rod to reciprocate through the transmission groove, guide post, transmission connecting rod, and inner core moving seat in sequence. 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 and formed, 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 the conveying process.

[0015] Furthermore, in this application, a spiral spring stamping forming device includes a tail-end stamping module comprising a lower moving block, an outer forming lower punch mounted on the lower moving block, the outer forming lower punch comprising a floating punch and a limiting punch adjacent to one side of the floating punch, the floating punch being floatingly mounted on the lower moving block, an elastic element being provided on the lower moving block corresponding to the bottom of the floating punch, the floating punch facing directly below the U-shaped structure, the limiting punch having a lower limiting arc groove, and the outer forming upper punch having an upper limiting arc groove corresponding to the lower limiting arc groove; when the outer forming upper punch and the outer forming lower punch open and reset, the floating punch protrudes upward from the lower limiting arc groove; during the process of the outer forming upper punch and the outer forming lower punch moving to engage, the floating punch first contacts the U-shaped structure and pushes the U-shaped structure to bend, during the bending process, the outer side of the U-shaped structure is guided and slid by the lower limiting arc groove and the upper limiting arc groove in sequence to rotate around the inner core rod, finally forming a connecting seat, during which the limiting elastic element of the inner core rod is compressed. Based on the above device, precise control of the bending and forming of the connecting seat can be achieved.

[0016] As can be seen from the above technical solution, the present invention has the following beneficial effects: The principle of a spiral spring stamping forming device is as follows: When the winding forming slider moves forward, it drives the forming punch to advance synchronously. After contacting the front end of the plate, pressure is applied to deform it. The forming limiting head of the auxiliary forming slider constrains the deformation position of the spring sheet, ensuring a stable winding trajectory. 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 spring winding layers to adapt to the design parameters. Throughout the process, the plate is gradually spirally wound under the synergistic action of the forming punch and the forming limiting head, ultimately forming the required spring body. This device has the advantages of compact structure and high degree of automation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a spiral spring stamping and forming device according to an embodiment of this application; Figure 2 for Figure 1 A schematic diagram of the structure behind the hidden base; Figure 3 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 4 for Figure 1 A top plan view of the structure in the image; Figure 5 for Figure 4 A cross-sectional view corresponding to the AA direction; Figure 6 for Figure 4 A cross-sectional view corresponding to the BB direction; Figure 7This 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 8 This is a schematic diagram illustrating the working principle of the winding and stamping module in the embodiments of this application. Figure 2 ; Figure 9 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 10 for Figure 9 A magnified view of a portion of area C in the middle circle; Figure 11 This is a schematic diagram of the stamping principle of the tail stamping module in the embodiments of this application; Figure 12 for Figure 11 A magnified view of a portion of area D in the center circle; Figure 13 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 14 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.

[0018] In the picture: 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; 8-Conveyor belt; 900-Plate body; 901-Spring body; 902-Connecting plate; 9021-U-shaped structure; 903-Connecting seat; 9030-Cavity. Detailed Implementation

[0019] A spiral spring stamping forming device is used to stamp a spring sheet into a coil spring. Before stamping, the spring sheet is as follows: Figure 3As shown, it includes a linearly extending plate 900, and a stamped coil spring including a spring body 901 formed by winding the plate 900, including a winding stamping module 2, as shown. Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, it includes: The winding forming slider 21 moves linearly along the extension direction of the plate 900 to be stamped, and the winding forming slider 21 is directly opposite the front end of the plate 900. Forming punch 22 is disposed on 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 clearance adjustment mechanism is connected to the forming punch 22 via a transmission. During the stamping process, combined with Figures 7 to 9 As shown, 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, the forming punch 22 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. 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.

[0020] Based on the above structure, the principle of a spiral spring stamping and forming device is as follows: 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, pressure is applied to deform it. The forming limiting head 231 of the auxiliary forming slider 23 constrains the deformation position of the spring piece, ensuring the stability of the winding trajectory. As the winding 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 gap change between the winding layers of the spring 901 to adapt to the design parameters. Throughout the process, the plate 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 901. It has the advantages of compact structure and high degree of automation.

[0021] Furthermore, in combination Figure 5 , Figure 7 and Figure 9As shown, in this embodiment, a spiral spring stamping forming device includes a gap adjustment mechanism comprising a guide block 241 and a transmission frame 242. The transmission frame 242 is rotatably mounted on the winding 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 portion, and the guide block 241 is provided with a slide rail that cooperates with the sliding connection portion. Based on the above structure, during the process of the winding forming slider 21 pushing the forming punch 22 to move, due to the guidance of the slide rail and the sliding connection portion, the transmission frame 242 rotates, causing the forming punch 22 to swing at a preset amplitude, thereby adjusting the relative position between the forming punch 22 and the forming limiting head 231, and thus realizing the 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 the design requirements and improving the forming accuracy and stability.

[0022] Furthermore, in this embodiment of the spiral spring stamping forming apparatus, the slide is a gap adjustment guide surface 244 disposed on the guide block 241 near the transmission frame 242. The sliding connection part abuts against the gap adjustment 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 part always in contact with the gap adjustment guide surface 244. Based on the above structure, the preload of the elastic element ensures that the sliding connection part and the gap adjustment 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 action. 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 coiling forming slider 21 and the transmission frame 242 to apply a torque to the transmission frame 242 to press the sliding connection part against the gap adjustment guide surface 244.

[0023] Furthermore, in this embodiment of the spiral spring stamping forming apparatus, the sliding connection part is a guide roller 2421 rotatably mounted on the transmission frame 242, the guide block 241 is located above the guide roller 2421, and 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.

[0024] Furthermore, in this embodiment of the spiral spring stamping forming apparatus, the forming punch 22 is a stamping roller rotatably mounted on the transmission frame 242, and the axis height 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. In addition, to prevent deviation in the bending direction of the plate 900, the spring sheet includes a bending head located at the front end of the plate 900 (i.e., the end near the forming punch 22), and the bending direction of the bending head toward the plate 900 is consistent with the winding direction of the spring body 901.

[0025] Furthermore, in this embodiment, a spiral spring stamping forming apparatus includes a driving surface 211 at the front end of the winding forming slider 21 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 applies a preset pressure to the auxiliary forming slider 23 to keep it 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. In 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.

[0026] Furthermore, in combination Figure 13As shown, in this embodiment, a spiral spring stamping and forming device has spring pieces disposed on one side of the width direction of the conveyor belt 8. The spring pieces are arranged along the extension direction of the conveyor belt 8. The conveyor belt 8 passes through a pair of forming limiting heads 231. The conveyor belt 8 is moved in the extension direction of the conveyor belt 8 so that each spring piece enters the pair of forming limiting heads 231 in sequence for stamping. 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 method is to 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 an avoidance limit groove 245, and using the cooperation between the guide roller 2421 and the avoidance limit 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.

[0027] Furthermore, in this embodiment, a spiral spring stamping forming device is combined with... Figure 6 As shown, it also includes a base 4, a winding and stamping module 2 is mounted on the base 4, a moving groove 41 for receiving and moving the conveying strip 8 is provided on the base 4, a winding forming slider 21 and an auxiliary forming slider 23 are slidably mounted on the base 4, and a guide block 241 is mounted on the base 4.

[0028] Furthermore, in this embodiment, a spiral spring stamping forming device is combined with... Figure 3 As shown, the spring sheet includes a connecting plate 902 located at the tail end of the plate body 900. The overall length direction of the plate body 900 and the connecting plate 902 is inclined to the length direction of the conveyor belt 8 (i.e., the overall length direction of the plate body 900 and the connecting plate 902 is not perpendicular to the length direction of the conveyor belt 8). It also includes a tail end stamping module 3, which is used to stamp the connecting plate 902 to form a connecting seat 903. The connecting seat 903 has a cavity 9030. The tail end stamping module 3 is located at the rear end of the winding stamping module 2. Figures 10 to 14 The tail-end stamping module 3 shown includes: The pair of pre-bending punches 31 shown above are vertically aligned and can move up and down to engage with both 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 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. An 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 inner core rod 34 is mounted on the inner core moving seat 341. A transmission connecting rod 35 is rotatably connected to the inner core moving seat 341. The transmission connecting rod 35 is rotatably connected to the seat body 4 through 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.

[0029] 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.

[0030] Furthermore, such as Figure 11As shown, in this embodiment, a spiral spring stamping forming device includes a tail stamping module 3 comprising a lower moving block 36, an outer forming lower punch 33 mounted on the lower moving block 36, the outer forming lower punch 33 comprising a floating punch 331 and a limiting punch 332 adjacent to one side of the floating punch 331, the floating punch 331 being floatingly mounted on the lower moving block 36, an elastic element 361 corresponding to the bottom of the floating punch 331 being provided on the lower moving block 36, the floating punch 331 being directly below the U-shaped structure 9021, the limiting punch 332 being provided with a lower limiting arc groove 3320, and the outer forming upper punch 32 being provided with an upper limiting arc groove 320 corresponding to the lower limiting arc groove 3320; When the outer forming upper punch 32 and the outer forming lower punch 33 are opened and reset, the floating punch 331 protrudes upward from the lower limit arc groove 3320. During the process of the upper forming punch 32 and the lower forming punch 33 moving to engage, the floating punch 331 first contacts the U-shaped structure 9021, pushing the U-shaped structure 9021 to bend. During the bending process, the outer surface of the U-shaped structure 9021 is guided and slid by the lower limiting arc groove 3320 and the upper limiting 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 upper forming punch 32 and the lower forming punch 33 engage, the upper forming 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 upper forming punch 32 share a lifting drive device, and the lower pre-bending punch 31 and the lower forming punch 33 share another lifting drive device. Furthermore, 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.

[0031] 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 spiral spring stamping forming apparatus for stamping a spring sheet into a coil spring, wherein the spring sheet before stamping comprises a linearly extending plate (900), and the coil spring after stamping comprises a spring body (901) formed by winding the plate (900), characterized in that: Including a winding and stamping module (2), which includes: A winding forming slider (21) moves linearly along the extension direction of the plate (900) to be stamped, and the winding forming slider (21) is directly opposite the front end of the plate (900); A forming punch (22) is provided on a 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 gap adjustment mechanism is connected to the forming punch (22) via a transmission. 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) comes into contact with the plate (900), the forming punch (22) is used to bend the plate (900) exposed outside a pair of forming limit heads (231). The auxiliary forming slider (23) is used to drive the forming limit head (231) to move with the forming punch (22). During this process, the plate (900) is continuously bent and wound to form a spring body (901). The gap adjustment mechanism is used to adjust the width of the discharge gap (220).

2. The spiral spring stamping forming device according to claim 1, characterized in that: 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.

3. The spiral spring stamping forming device according to claim 2, characterized in that: The slide is a gap adjustment guide surface (244) set on the guide block (241) near the transmission frame (242). The sliding connection part abuts against the gap adjustment guide surface (244). An elastic element is connected to the transmission frame (242) to apply elastic force to the transmission frame (242) so as to keep the sliding connection part abutting against the gap adjustment guide surface (244).

4. The spiral spring stamping forming device according to claim 3, characterized in that: The sliding connection is a guide roller (2421) rotatably mounted on the transmission frame (242). 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).

5. The spiral spring stamping forming device according to claim 3, characterized in that: The guide block (241) is located above the guide roller (2421), and the forming punch (22) is a stamping roller rotatably mounted on the transmission frame (242). The axis height of the stamping roller is always located on the upper side of the plate (900).

6. The spiral 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).

7. The spiral spring stamping forming device according to claim 6, characterized in that: The spring is set on one side of the width direction of the conveyor belt (8). The spring is arranged along the extension direction of the conveyor belt (8). The conveyor belt (8) passes through 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 enters between a pair of forming limit heads (231) in sequence to be stamped. 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).

8. The spiral spring stamping forming apparatus according to claim 7, characterized in that: It also includes a base (4), the winding and stamping module (2) is set on the base (4), the base (4) is provided with a moving groove (41) for receiving and conveying the material belt (8), the winding forming slider (21) and the auxiliary forming slider (23) are slidably set on the base (4), and the guide block (241) is installed on the base (4).

9. The spiral spring stamping forming device according to claim 8, characterized in that: The spring includes a connecting plate (902) located at the tail end of the plate body (900). The length direction of the plate body (900) and the connecting plate (902) is inclined to the length direction of the conveyor belt (8). It also includes a tail end stamping module (3) for stamping the connecting plate (902) to form a connecting seat (903). The connecting seat (903) has a cavity (9030). The tail end stamping module (3) is located at the rear end of the winding stamping module (2). 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 inner core rod (34) is installed on the inner core moving seat (341). A transmission connecting rod (35) is rotatably connected to the inner core moving seat (341). The transmission connecting rod (35) 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).

10. A spiral spring stamping forming apparatus according to claim 9, characterized in that: The tail stamping module (3) includes a lower moving block (36), and the 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) is directly below the U-shaped structure (9021). The limiting punch (332) is provided with a lower limiting arc groove (3320). The outer forming upper punch (32) is provided with an upper limiting arc groove (320) corresponding to the lower limiting arc groove (3320). When the outer forming upper punch (32) and the outer forming lower punch (33) are opened 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 the outer forming lower punch (33) moving to meet, 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) and finally form the connecting seat (903).

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