Automatic stamping equipment for stamping automobile plate accessories

Abstract

The invention discloses automatic stamping equipment for stamping automobile plate accessories, and relates to the field of stamping equipment.The automatic stamping equipment comprises a stamping die and a punch which are arranged on a rack, and further comprises a rotating roller rotationally connected with the rack and parallel to the punch, the lower end of the rotating roller is provided with a swing arm, and the swing arm is provided with a positioning rod corresponding to a punched hole of an annular part; the positioning wheel set is arranged at the upper end of the rack, distributed in the circumferential direction of the rotating roller and used for enabling the annular part and the rotating roller to be coaxial and enabling the position, needing to be punched, of the annular part to be right opposite to the punch, and when a first punched hole is punched in the annular part, the swing arm drives the positioning rod to be inserted into the punched hole, and the rotating roller drives the swing arm to rotate; the swing arm drives the annular part to rotate intermittently, then the position of the annular part is adjusted, other punched holes are punched in the annular part in sequence through the punch in the rotating process of the annular part, and the effect that the punching efficiency is improved when a plurality of punched holes are machined in the circumferential direction of the annular part is achieved.

Description

Technical Field

[0001] This invention relates to the field of stamping equipment, and in particular to an automatic stamping equipment for stamping automotive sheet metal parts. Background Technology

[0002] Metal stamping is a crucial manufacturing process in metal processing. During stamping, external force is applied to sheet metal, strip, tube, or other profiles using pressure equipment, causing the metal raw material to undergo plastic deformation and obtain the desired shape. Many parts in a car body are manufactured using stamping, such as doors, roofs, and chassis.

[0003] Related technology can be found in Chinese patent application CN115815451A, which discloses an adjustable stamping device for automotive parts. The device includes a base frame, a lower die, an upper die, a suction cup, a drive unit, and a transfer unit. The lower die includes a base with a cylindrical cavity, an annular column within the base, and a first elastic telescopic member at the bottom of the annular column. The upper die includes a hydraulic cylinder, with a first plate at its bottom. The first plate is connected to a second plate via multiple second elastic telescopic members. A first punch is located at the bottom of the first plate and is slidably connected to the second plate. A second punch is located at the bottom of the second plate. At least two sets of adjustment units are provided between the first and second plates. The suction cup is positioned between the first and second punches. The drive unit drives the movement of the sheet metal material. The transfer unit transfers the stamped annular parts.

[0004] Regarding the aforementioned technologies, in the process of automotive parts production, it is sometimes necessary to perform secondary stamping on ring-shaped parts. For example, several mounting holes are opened along the circumference of the ring-shaped part. When multiple holes are opened along the circumference of the ring-shaped part by stamping, the ring-shaped part needs to be rotated continuously and the stamping position of the ring-shaped part needs to be adjusted. The stamping process is relatively cumbersome and difficult to automate, resulting in low stamping efficiency. Summary of the Invention

[0005] In order to improve the stamping efficiency when performing multiple punching operations along the circumference of annular parts, this application provides an automatic stamping equipment for stamping automotive sheet metal parts.

[0006] This application provides an automatic stamping equipment for stamping automotive sheet metal parts, which adopts the following technical solution: An automatic stamping equipment for stamping automotive sheet metal parts includes a frame, with a stamping die and a punch at the upper end of the frame. The stamping die is connected to the frame, and the punch is located directly above the stamping die and performs reciprocating motion vertically. The equipment also includes: The feeding component is located at the upper end of the frame and is used to push the ring-shaped part above the stamping die. The upper end of the frame is also equipped with a support roller. When the ring-shaped part is located above the stamping die, the support roller supports the ring-shaped part and keeps the ring-shaped part in a horizontal state. The rotating roller is located on the side of the stamping die away from the loading part and is rotatably connected to the frame in the transverse direction. When the ring part is in the waiting state, it is coaxial with the rotating roller. The frame is provided with a drive component for rotating the rotating roller. A moving ring is slidably connected to the outer side of the rotating roller along the axial direction. A pusher component for moving the moving ring is fixedly provided on the frame. A swing arm is provided under the moving ring. The swing arm is rotatably connected to the moving ring with the rotating roller as the center. A positioning rod is provided at the end of the swing arm away from the moving ring. The positioning rod is set vertically and the diameter of the positioning rod is the same as the diameter of the punch. A spiral guide groove is set on the outer circle of the rotating roller. A slider that matches the guide groove is fixedly connected to the swing arm. The slider is located in the guide groove and is slidably connected to the rotating roller along the guide groove. When the slider is located at the lower end of the guide groove, the positioning rod is located directly above the stamping die. The positioning wheel assembly, arranged circumferentially along the rotating roller, is used to limit the movement of the annular part, ensuring that the annular part remains coaxial with the rotating roller.

[0007] By adopting the above technical solution, the feeding component pushes the annular part into the positioning wheel set, which then limits the positioning wheel set on the annular part. At this time, the annular part is coaxial with the rotating roller. The frame supports the annular part through the stamping die and support roller, keeping the annular part in a horizontal state. In the initial state, the feeding component limits the swing arm through the moving ring, so that the swing arm is located at the upper end of the guide groove. The slider cooperates with the guide groove to make the swing arm rotate laterally. At this time, the swing arm drives the positioning rod to avoid the punch. After the punch and the stamping die punch out the first hole on the annular part, the punch moves up and drives the moving ring to move down through the feeding component. The moving ring drives the swing arm to descend. Under the guidance of the guide groove, the swing arm drives the positioning rod to swing laterally, so that the positioning rod moves above the first hole of the annular part. When the swing arm descends to the lowest point, the positioning rod extends into the first hole of the annular part and contacts the inner wall of the hole. When a second punch is needed, the rotating component drives the rotating roller to rotate, and the rotating tube drives the swing arm to rotate through the slider. Then, under the support of the positioning wheel group, the positioning rod drives the ring part to rotate by a preset angle. When the swing arm rotates, it avoids the punch. At this time, the punch falls again and cooperates with the stamping die to stamp the ring part. This process is repeated to complete the stamping of multiple circumferential punches on the ring part. When stamping multiple circumferential punches on the ring part, the ring part can rotate automatically, which helps to improve the processing convenience of the ring part and improves the stamping efficiency.

[0008] Optionally, the positioning wheel set includes a positioning wheel one and two sets of positioning wheels two. The positioning wheel one is located on the side of the rotating roller away from the positioning mold. The upper end of the frame is provided with a support block for supporting the positioning wheel one. The positioning wheel one is located above the support block and rotates laterally. Both sets of positioning wheels two are located on the side of the rotating roller away from the support block. The upper end of the frame is provided with two sets of symmetrical movable seats centered on the stamping mold. The movable seats correspond one-to-one with the positioning wheels two. The positioning wheels two are rotatably connected to the corresponding movable seats laterally. The frame is provided with clamping parts for driving the two sets of movable seats to move closer or further apart. In the working state, the upper surfaces of the positioning wheel one and the positioning wheel two are higher than the upper surface of the stamping mold.

[0009] By adopting the above technical solution, in the initial state, the two moving seats are far apart. At this time, the second positioning wheel avoids the annular part, making it easier for the feeding component to push the annular part above the stamping die. When the center of the annular part is between the second and first positioning wheels, the clamping component drives the two moving seats to move closer to each other. The moving seats drive the second positioning wheel to approach the annular part. After the second positioning wheel contacts the outer circle of the annular part, it squeezes the annular part, causing the annular part to move closer to the first positioning wheel. The frame supports and limits the first positioning wheel through the support block. When the annular part contacts the first positioning wheel, the moving seats stop. At this time, the first and second positioning wheels cooperate to limit the annular part, making the annular part coaxial with the rotating roller. When the swing arm drives the annular part to rotate, the annular part drives the first and second positioning wheels to rotate, which helps to improve the convenience of the annular part's rotation.

[0010] Optionally, the swing arm includes a connecting part and an adjusting part. The connecting part is located below the moving ring and rotates coaxially with the moving ring. The slider is fixedly connected to the connecting part. An extension arm is fixedly connected to the end face of the connecting part away from the axis of the rotating roller in the transverse direction. The adjusting part is located on the side of the extension arm away from the connecting part and is slidably connected to the extension arm in the diameter direction of the moving ring. The extension arm is provided with a moving rod for driving the adjusting arm to move. A positioning rod is located at the lower end of the adjusting part and is slidably connected to the adjusting part in the vertical direction. An elastic element is provided between the adjusting part and the positioning rod. In the natural state of the elastic element, the lower end face of the positioning rod is lower than the lower end face of the adjusting part.

[0011] By adopting the above technical solution, the connecting part supports the adjusting part through the extension arm, so that the adjusting part supports the positioning rod. The elastic element allows the positioning rod to move vertically. When the positioning rod is not aligned with the first punch of the ring part, the positioning rod is pressed into the adjusting part, thereby reducing the probability of the positioning rod and the ring part having a rigid collision. By moving the rod, the adjusting part is moved closer to or away from the rotating roller, thereby adjusting the position of the positioning rod. This is suitable for ring parts of different specifications.

[0012] Optionally, the driving component includes a motor, an intermittent wheel assembly, and a sprocket assembly. The frame is rotatably connected to a linkage shaft parallel to the rotating roller. The sprocket assembly is located between the linkage shaft and the rotating roller. When the linkage shaft rotates, it drives the rotating roller to rotate through the sprocket assembly. The motor is fixedly connected to the frame. The intermittent wheel assembly is located between the motor and the linkage shaft. The motor drives the linkage shaft to rotate intermittently through the intermittent wheel assembly. The intermittent rotation angle of the linkage shaft is adapted to the arc between two adjacent punches on the annular part.

[0013] By adopting the above technical solution, the motor drives the linkage shaft to rotate via the intermittent wheel set, which in turn drives the rotating roller to rotate via the sprocket set. The intermittent wheel set rotates at the same angle each time, thus ensuring the rotating roller maintains a stable angle each time. This improves the accuracy of the ring-shaped parts during rotation and enhances the machining quality of the ring-shaped parts.

[0014] Optionally, the stamping die has a blanking plate on the side away from the loading part. The blanking plate is reciprocated in the direction of approaching or moving away from the stamping die. A hanging rod is vertically hinged to the upper end of the blanking plate, and a stop block is fixedly connected to the blanking plate. The stop block is located on the side of the hanging rod close to the stamping die. An elastic element two is provided between the hanging rod and the blanking plate. In its natural state, the hanging rod abuts against the stop block and is in a vertical state. The support block also includes a rotating rod for supporting the rotation of the positioning wheel one. The rotating rod passes through the support block along the axial direction and is rotatably connected to the support block. An elastic element three is provided between the rotating rod and the support die. The elastic element three supports the positioning wheel one through the rotating rod. A guide block is fixedly provided at the lower end of the rotating rod. The blanking plate has a translation plate corresponding to the guide block. When the blanking plate approaches the stamping die, the translation plate contacts the guide plate and drives the rotating rod to move down through the guide plate, so that the positioning wheel pair avoids the annular parts.

[0015] By adopting the above technical solution, in the initial state, the elastic element three is in a natural state, the rotating rod supports the positioning wheel one, and the positioning wheel one limits the annular part. The blanking plate is located away from the stamping die. After the annular part is stamped, the blanking plate is manipulated to move closer to the stamping die. When the blanking plate moves, it drives the hook rod and the translation plate to move synchronously. When the translation plate contacts the guide block, it drives the guide block to move down. When the guide block moves, it drives the rotating rod to move down, so that the positioning wheel one avoids the annular part. The blanking plate continues to move, so that the hook rod contacts the side of the annular part away from the positioning wheel two. Under the blocking action of the annular part, the hook rod flips vertically and drives the elastic element two to deform. When the hook rod enters the inner side of the annular part, the elastic element two drives the hook rod to reset. At this time, the blanking plate resets. Under the blocking action of the stop block, the hook rod drives the annular part away from the stamping die, completing the automatic blanking of the annular part.

[0016] Optionally, a feeding rack is also included. The feeding rack is located on the side of the rotating roller away from the stamping die. The feeding rack includes multiple support plates, which are located at the upper end of the frame and arranged in a ring. When the feeding plate is working, it moves the ring-shaped part between all the support plates. The upper end of the frame is provided with a support rail for supporting the movement of the ring-shaped part. Each support plate has a vertically hinged support rod on the side that is close to each other. The support rod is in a horizontal state in its natural state. The frame is slidably connected to a top plate. The feeding plate is provided with a lifting member for pushing the top plate to move vertically. When the ring-shaped part is located between all the support plates, it is directly above the top plate.

[0017] By adopting the above technical solution, under the support of the support rail, the feeding plate moves the ring-shaped part between all the support plates through the hook rod, so that the ring-shaped part is above the top plate. At this time, all the support rods are in a horizontal state. The top plate is moved up by the lifting component, so that the top plate pushes the ring-shaped part closer to the support rod. When the ring-shaped part contacts the support rod, it pushes the support rod to flip upward. When the ring-shaped part is released from the support rod, the support rod returns to its original position under the action of gravity. At this time, the top plate is lowered, and the ring-shaped part is placed above the support rod, so that all the support rods cooperate to support the ring-shaped part. The ring-shaped parts on the support rods are stacked one after another, which makes it easier to stack the ring-shaped parts and improves the processing convenience.

[0018] Optionally, the lifting component includes a push plate and a return spring. An inclined plate is fixedly connected to the lower end of the top plate. The inclined plate is inclined from top to bottom towards the stamping die, and the end face of the inclined plate near the stamping die is a vertical plane. The push plate is located above the blanking plate and is rotatably connected to the blanking plate in the transverse direction. A stop block is fixedly connected to the upper end of the blanking plate. The stop block is located on the side of the push plate away from the stamping die. The return spring is located between the push plate and the stop block. In the natural state, the push plate and the stop block abut against each other, and the push plate and the inclined plate are directly opposite each other.

[0019] By adopting the above technical solution, when the lower plate moves the push plate closer to the stamping die, the push plate first contacts the inclined surface of the inclined plate. Under the obstruction of the stop block, the push plate presses against the inclined plate through the inclined surface, causing the inclined plate to move the top plate upward. When the push plate disengages from the inclined plate, the inclined plate and the top plate return to their original positions under the action of gravity. When the lower plate moves another annular part upward towards the top plate again, the side of the push plate near the stop block contacts the vertical plane of the inclined plate. As the lower plate continues to move, the inclined plate causes the push plate to flip away from the stop block, allowing the push plate to avoid the inclined plate. When the push plate disengages from the inclined plate again, the return spring causes the push plate to return to its original position, so that the push plate is once again facing the inclined side of the inclined plate.

[0020] Optionally, the feeding component includes a push plate, two straight plates, a power component, and a return spring. The push plate is slidably connected to the frame along the direction of approaching or moving away from the stamping die. The power component is fixedly connected to the frame and is used to drive the push plate to move. The upper end surface of the push plate is higher than the upper end surface of the stamping die. The two straight plates are located on both sides of the push plate and are slidably connected to the push plate along the sliding direction of the push plate. The upper end surface of the straight plates is flush with the upper end surface of the stamping die. The return spring is located between the straight plates and the push plate. In its natural state, the straight plates extend towards the stamping die.

[0021] By adopting the above technical solution, the ring-shaped part to be processed is placed above two straight plates. The push plate supports the ring-shaped part through the straight plates. When the power component drives the push plate to move, the push plate and the straight plates cooperate to drive the ring-shaped part to move. For ring-shaped parts of different diameters, the pushing distance of the push plate is different. When the straight plate comes into contact with other structures on the frame, the push plate and the straight plate slide relative to each other. At this time, the push plate continues to drive the ring-shaped part to move. The return spring deforms. When the push plate moves away from the stamping die, the return spring drives the straight plate to reset.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The feeding component pushes the annular part into the positioning wheel set, which limits the position of the annular part. At this time, the annular part is coaxial with the rotating roller. The frame supports the annular part through the stamping die and support roller, keeping the annular part in a horizontal position. In the initial state, the feeding component limits the swing arm through the moving ring, so that the swing arm is located at the upper end of the guide groove. The slider cooperates with the guide groove to make the swing arm rotate laterally. At this time, the swing arm drives the positioning rod to avoid the punch. After the punch and stamping die punch out the first hole on the annular part, the punch moves up and drives the moving ring to move down through the feeding component. The moving ring drives the swing arm to descend. Under the guidance of the guide groove, the swing arm drives the positioning rod to swing laterally, so that the positioning rod moves above the first hole of the annular part. When the swing arm descends to the lowest point, the positioning rod extends into the first hole of the annular part and contacts the inner wall of the hole. When a second punch is needed, the rotating component drives the rotating roller to rotate, and the rotating tube drives the swing arm to rotate through the slider. Then, under the support of the positioning wheel group, the positioning rod drives the ring part to rotate by a preset angle. When the swing arm rotates, it avoids the punch. At this time, the punch falls again and cooperates with the stamping die to punch the ring part. This process is repeated to complete the punching of multiple circumferential punches on the ring part. When punching multiple circumferential punches on the ring part, the ring part can rotate automatically, which helps to improve the processing convenience of the ring part and improves the stamping efficiency. 2. In the initial state, the elastic element three is in its natural state, and the rotating rod supports the positioning wheel one, limiting the positioning wheel pair to the annular part. The blanking plate is located away from the stamping die. After the annular part is stamped, the blanking plate is manipulated to move closer to the stamping die. When the blanking plate moves, it drives the hook rod and the translation plate to move synchronously. When the translation plate contacts the guide block, it drives the guide block to move down. When the guide block moves, it drives the rotating rod to move down, causing the positioning wheel pair to avoid the annular part. The blanking plate continues to move, causing the hook rod to contact the side of the annular part away from the positioning wheel two. Under the blocking action of the annular part, the hook rod flips vertically and causes the elastic element two to deform. When the hook rod enters the inner side of the annular part, the elastic element two drives the hook rod to reset. At this time, the blanking plate resets. Under the blocking action of the stop block, the hook rod drives the annular part away from the stamping die, completing the automatic blanking of the annular part. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the embodiment.

[0024] Figure 2 This is a schematic diagram designed to highlight the location of the loading component.

[0025] Figure 3 This is a schematic diagram designed to highlight the connection of the rotating rollers.

[0026] Figure 4 This is a schematic diagram designed to highlight the internal structure of the adjustment section.

[0027] Figure 5 This is a schematic diagram designed to highlight the fit between the slider and the straight groove.

[0028] Figure 6 This is a schematic diagram designed to highlight the structure of the cutting plate and the translation plate.

[0029] Figure 7 This is a schematic diagram designed to highlight the connection structure between the push plate and the translation plate.

[0030] Explanation of reference numerals in the attached drawings: 1. Frame; 11. Stamping die; 12. Punch; 13. Support roller; 14. Linkage shaft; 15. Support rail; 16. Top plate; 161. Inclined plate; 21. Push plate; 22. Straight plate; 23. Power component; 24. Return spring; 3. Rotating roller; 31. Drive component; 311. Motor 1; 312. Intermittent wheel assembly; 313. Sprocket assembly; 32. Moving ring; 33. Pushing component; 341. Connecting part; 342. Adjusting part; 343. Slider; 344. Extension arm; 345. Moving rod; 346. Elastic component 1 351. Guide groove; 352. Straight groove; 36. Positioning rod; 41. Positioning wheel one; 42. Positioning wheel two; 43. Support block; 431. Rotating rod; 432. Elastic element three; 433. Guide block; 44. Moving seat; 45. Clamping element; 451. Motor two; 452. Bidirectional lead screw; 46. Limiting wheel; 5. Feeding plate; 51. Right angle rod; 511. Stop block; 512. Elastic element two; 52. Hanging rod; 53. Translation plate; 54. Push plate; 541. Return spring; 542. Stop block; 61. Support plate; 62. Support rod. Detailed Implementation

[0031] The present application will be further described in detail below with reference to all the accompanying drawings.

[0032] This application discloses an automatic stamping equipment for stamping automotive sheet metal parts. Example

[0033] Reference Figure 1 and Figure 2 An automatic stamping equipment for stamping automotive sheet metal parts includes a frame 1. A feeding component, a stamping die 11, a rotating roller 3, and a blanking plate 5 are sequentially arranged at the upper end of the frame 1. A mounting base is fixedly provided at the upper end of the frame 1, and the stamping die 11 is mounted above the mounting base. The mounting base has a vertically opening for a blanking port. A scrap box is provided at the lower end of the frame 1, directly opposite the blanking port. A mounting plate is also slidably connected vertically to the frame 1. A hydraulic cylinder for moving the mounting plate is installed on the frame 1. The mounting plate is located above the mounting base, and a punch 12 adapted to the stamping die 11 is provided at the lower end of the mounting plate.

[0034] Reference Figure 2 and Figure 3The rotating roller 3 is arranged parallel to the punch 12 and is rotatably connected to the frame 1 in the transverse direction. The frame 1 is provided with a drive component 31 for driving the rotating roller 3 to rotate. The drive component 31 includes a motor 311, an intermittent wheel assembly 312, and a sprocket assembly 313. The motor 311 is fixedly connected to the frame 1, and the frame 1 is rotatably connected to a linkage shaft 14 parallel to the rotating roller 3. The intermittent wheel assembly 312 is located between the motor 311 and the linkage shaft. The outer side of the intermittent wheel assembly 312 is provided with a protective cover for supporting the intermittent wheel structure. The protective cover is detachably connected to the frame 1 by bolts. The intermittent wheel assembly 312 is provided with an input shaft and an output shaft. When the output shaft rotates continuously, the intermittent wheel assembly 312 outputs intermittent rotation through the output shaft. The angle of each intermittent rotation of the output shaft is adapted to the arc between two adjacent punches on the annular part. The intermittent wheel structure is existing technology and will not be described in detail here.

[0035] Reference Figure 2 and Figure 3 The output shaft of motor 311 is connected to the input shaft of intermittent gear set 312 via a coupling. The output shaft of intermittent gear set 312 is connected to the linkage shaft 14 via another coupling, so that motor 311 drives linkage shaft 14 to rotate intermittently when it is working. Sprocket set 313 includes sprocket 1, sprocket 2 and annular chain. Sprocket 1 is coaxially fixed to linkage shaft 14, sprocket 2 is coaxially fixed to rotating roller 3, and the annular chain is located between sprocket 1 and sprocket 2, and the annular chain meshes with both sprocket 1 and sprocket 2. When linkage shaft 14 rotates, it drives rotating roller 3 to rotate through the transmission action of sprocket 1, annular chain and sprocket 2.

[0036] Reference Figure 2 and Figure 3 A movable ring 32 is slidably connected to the lower end of the rotating roller 3 along the axial direction. A pusher 33 is installed on the upper end of the frame 1 to drive the movable ring 32 to move. In this embodiment, the pusher 33 is an electric actuator. When the electric actuator is working, it drives the movable ring 32 to move along the axis of the rotating roller 3 through its output end. A swing arm is provided below the movable ring 32. The swing arm includes a connecting part 341 and an adjusting part 342. The connecting part 341 is sleeved on the outside of the rotating roller 3 and rotates around the axis of the rotating roller 3 and is rotatably connected to the movable ring 32. When the movable ring 32 moves along the axial direction, it drives the connecting part 341 to move synchronously.

[0037] Reference Figure 3 and Figure 5 The outer surface of the rotating roller 3 has a guide groove 351 arranged circumferentially. The guide groove 351 is spirally arranged. A slider 343 adapted to the guide groove 351 is fixedly connected to the connecting part 341. The slider 343 is located inside the guide groove 351 and contacts the inner wall of the guide groove 351. When the connecting part 341 moves along the axis of the rotating roller 3, the rotating roller 3 guides the slider 343 to rotate laterally through the guide groove 351, so that the slider 343 drives the connecting part 341 to rotate synchronously.

[0038] Reference Figure 3 and Figure 4 An extension arm 344 is radially fixedly connected to the outer circumference of the connecting part 341. When the connecting part 341 moves, it drives the extension arm 344 to move. The adjusting part 342 is located at one end of the extension arm 344 away from the axis of the rotating roller 3, and a slide rod is fixedly connected to the adjusting part 342 along the extension direction of the extension arm 344. The slide rod passes through the extension arm 344 and is slidably connected to the extension arm 344. When the extension arm 344 moves, it drives the adjusting part 342 to move synchronously through the slide rod. The extension arm 344 is provided with a moving rod 345, which is a threaded rod and parallel to the slide rod. The moving rod 345 passes through the extension arm 344 and is threadedly connected to the extension arm 344. The moving rod 345 is rotatably connected to the adjusting part 342. Under normal conditions, the extension arm 344 limits the adjusting part 342 through the moving rod 345. When the moving rod 345 is rotated, it pushes the adjusting part 342 closer to or away from the rotating roller 3.

[0039] Reference Figure 3 and Figure 4 The lower end of the adjusting part 342 has a limit hole along the vertical direction. A positioning rod 36 is provided in the limit hole. The outer diameter of the positioning rod 36 is adapted to the inner diameter of the punch hole that needs to be stamped in the ring part. The adjusting part 342 is provided with a pin for fixing the positioning rod 36 along the vertical direction. The pin passes through the positioning rod 36 and is slidably connected to the positioning rod 36. An elastic element 346 is also provided in the limit hole. The elastic element 346 is a spring. One end of the spring is fixedly connected to the adjusting part 342, and the other end abuts against the upper end face of the positioning rod 36.

[0040] Reference Figure 3 and Figure 4 In its natural state, the lower end of the positioning rod 36 extends from the limiting hole. Before processing the annular part, the position of the adjusting part 342 is adjusted so that the distance from the positioning rod 36 to the axis of the rotating roller 3 is the same as the distance from the stamping die 11 to the axis of the rotating roller 3. The lower end of the rotating roller 3 is also provided with a vertically arranged straight groove 352, which is connected to the lower end of the guide groove 351. When the slider 343 enters the straight groove 352 along the guide groove 351, the positioning rod 36 is located directly above the stamping die 11.

[0041] Reference Figure 2 and Figure 3The frame 1 is equipped with a positioning wheel assembly, which includes a positioning wheel 41 and at least two positioning wheels 42. The positioning wheel 41 is located on the side of the rotating roller 3 away from the stamping die 11. The frame 1 is provided with a support block 43 for supporting the positioning wheel 41. The support block 43 is slidably connected to the frame 1 in the direction of the rotating roller 3 pointing towards the stamping die 11. The frame 1 is fixedly connected with a slide rail for guiding the movement of the support block 43. The support block 43 is threadedly connected with a positioning screw shank. When the positioning screw shank is tightened, it abuts against the slide rail. At this time, the slide rail and the positioning screw shank cooperate to support the support block 43.

[0042] Reference Figure 2 and Figure 3 A support block 43 is vertically slidably connected to a rotating rod 431. A positioning wheel 41 is sleeved on the upper end of the rotating rod 431 and rotates coaxially with the rotating rod 431. When the support block 43 moves, it drives the positioning wheel to move through the rotating rod 431. An elastic element 432 is provided at the lower end of the support block 43. The elastic element 432 is a spring. One end of the spring is fixedly connected to the rotating rod 431, and the other end abuts against the support block 43. When the elastic element 432 is in its natural state, the upper end surface of the positioning wheel 41 is higher than the upper end surface of the stamping die 11. A guide block 433 is fixedly connected to the lower end of the rotating rod 431. The guide block 433 is located on the outer surface of the rotating rod 431, and the guide block 433 is inclined away from the end face of the stamping die 11. The inclination direction is from top to bottom away from the stamping die 11.

[0043] Reference Figure 2 and Figure 3 The upper end of the frame 1 is also provided with two limiting wheels 46, which are symmetrical about the support wheel. The frame 1 is provided with movable blocks that correspond one-to-one with the limiting wheels 46. The movable blocks are located below the corresponding limiting wheels 46 and are slidably connected to the frame 1 in the direction of approaching or moving away from the support block 43. The frame 1 is provided with a push spring for pushing the limiting wheels 46 closer to the support block 43, so that the limiting wheels 46 are close to the support block 43 in their natural state.

[0044] Reference Figure 2 and Figure 3Positioning wheel 42 is located on the side of rotating roller 3 away from support block 43. In this embodiment, two positioning wheels 42 are used as an example for explanation. The two positioning wheels 42 are symmetrically arranged with the line connecting stamping die 11 and rotating roller 3 as the center. The upper end of frame 1 is provided with movable seats 44 corresponding to the positioning wheels 42 one by one. The two movable seats 44 are slidably connected to frame 1 in the direction of approaching or moving away from each other. Frame 1 is provided with clamping member 45 for driving the two movable seats 44 to move. Clamping member 45 includes a bidirectional lead screw 452 and a motor 451. Motor 451 is fixedly connected to frame 1. The bidirectional lead screw 452 is coaxially fixed with the output shaft of motor 451. The two movable seats 44 are respectively located at both ends of the bidirectional lead screw 452. The bidirectional lead screw 452 passes through the movable seats 44 and is threadedly connected to the movable seats 44. Under the limiting action of frame 1, when the bidirectional lead screw 452 rotates, it drives the two movable seats 44 to approach or move away from each other.

[0045] Reference Figure 1 and Figure 2 The feeding components include a push plate 21, two straight plates 22, a power component 23, and a return spring 24. The push plate 21 is located on the side of the stamping die 11 away from the rotating roller 3. A moving rail is fixedly connected to the frame 1 along the direction from the stamping die 11 to the rotating roller 3. The push plate 21 is located above the moving rail and is slidably connected to the moving rail along its length. The power component 23 is a guide rail cylinder, which is installed above the frame 1 and is used to drive the push plate 21 to move along the moving rail. The upper end face of the push plate 21 is higher than the upper end face of the stamping die 11. The two straight plates 22 are located on both sides of the push plate 21, and the straight plates 22 are parallel to the moving rail. The straight plates 22 pass through the push plate 21 and are slidably connected to the push plate 21 along their own length. The return spring 24 is fixedly connected between the push plate 21 and the straight plates 22. In the natural state of the return spring 24, the straight plates 22 extend towards the stamping die 11, and the push plate 21 moves, driving the straight plates 22 to move.

[0046] Reference Figure 1 and Figure 2 The upper surface of the straight plate 22 is not lower than the upper surface of the stamping die 11. When processing a ring-shaped part, the ring-shaped part is placed on the upper surfaces of the two straight plates 22. This process can be done manually or by a robot to improve work efficiency and automation. The power component 23 drives the push plate 21 to move closer to the stamping die 11. The push plate 21 moves the ring-shaped part through the straight plates 22. When the push plate 21 approaches the stamping die 11, the straight plate 22 contacts the frame 1. At this time, the push plate 21 continues to move, and the straight plate 22 and the push plate 21 undergo relative displacement, deforming the return spring 24.

[0047] Reference Figure 1 and Figure 3Initially, the two positioning wheels 42 are far apart. When the annular part passes between the two positioning wheels, the clamping member 45 drives the two moving seats 44 to move closer together. The upper surface of the positioning wheel 42 is higher than the upper surface of the straight plate 22. During the process of the two positioning wheels 42 moving closer together, they first contact the annular part and limit its movement. At this time, the push plate 21 resets, and the annular part stays above the stamping die 11. Two sets of support rollers 13 are also rotatably connected to the upper end of the frame 1. The support rollers 13 are located on the side of the stamping die 11 away from the push plate 21, and the upper surface of the support rollers 13 is flush with the upper surface of the stamping die 11. After the annular part is separated from the straight plate 22, the stamping die 11 and the support rollers 13 cooperate to support the annular part, keeping it in a horizontal state.

[0048] Reference Figure 2 and Figure 3 The two positioning wheels 42 continue to move closer, pushing the annular part towards the positioning wheel 41. As the annular part moves, it first contacts the two limiting wheels 46, which work together to straighten the annular part and reduce the probability of it deviating as it approaches the positioning wheel 41. By adjusting the position of the support block 43, when the outer edge of the annular part contacts the outer circle of the positioning wheel 41, the rotating roller 3 and the annular part are coaxial, and at this time, the punch 12 is aligned with the position on the annular part where a punch is needed.

[0049] Reference Figure 3 and Figure 4 Initially, the swing arm is positioned away from the stamping die 11. Under the limiting action of the slider 343 and guide groove 351, the adjusting part 342 is tilted relative to the punch 12, thus avoiding the punch 12. The punch 12 is pressed down, causing it to cooperate with the stamping die 11 to stamp the annular part, forming the first punched hole. After stamping, the punch 12 moves upward and pushes the swing arm downward via the moving ring 32. Under the cooperation of the slider 343 and guide groove 351, the swing arm moves downward, causing the positioning rod 36 to move above the stamping die 11. When the slider 343 reaches the lowest end of the guide groove 351, the positioning rod 36 is aligned with the first punched hole of the annular part. At this time, the moving ring 32 continues to move downward, causing the slider 343 to enter the straight groove 352, while the positioning rod 36 enters the first punched hole of the annular part.

[0050] Reference Figure 3 and Figure 4Under the action of the elastic element 346, the positioning rod 36 has vertical movement space. When the positioning rod 36 is not aligned with the first punch hole of the ring part due to operation error or other problems, if the positioning rod 36 contacts the ring part during the downward movement, the positioning rod 36 will be pressed into the limiting hole as the adjusting part 342 moves downward, which will help reduce the probability of rigid collision between the positioning rod 36 and the ring part.

[0051] Reference Figure 3 and Figure 4 When motor 311 is working, it drives the rotating roller 3 to rotate intermittently through the gap wheel group. Under the limiting action of the straight groove 352 on the slider 343, the rotating roller 3 drives the swing arm to rotate. Through the cooperation of the positioning rod 36 with the first punch of the annular part, the swing arm drives the annular part to rotate. When the annular part rotates to a preset arc, it stops. At this time, the punch 12 presses down again to complete the second punch. The above operation is repeated until all the punching of the annular part along the circumference is completed. The rotation process of the annular part is carried out automatically, which helps to improve the processing convenience of the annular part and improves the stamping efficiency.

[0052] Reference Figure 3 and Figure 6 The upper end of the frame 1 is also provided with a blanking plate 5, which is located on the side of the stamping die 11 away from the push plate 21. The blanking plate 5 is slidably connected to the frame 1 along the direction of the rotating roller 3 pointing towards the stamping die 11. Another guide cylinder for moving the blanking plate 5 is installed at the lower end of the frame 1. A translation plate 53 facing the inclined surface of the guide block 433 is fixedly connected to the side of the blanking plate 5 near the stamping die 11. A feeding rack is also provided at the end of the frame 1 away from the push plate 21. The feeding rack includes multiple support plates 61, which are arranged in a ring. The gap between all support plates 61 is greater than the outer diameter of the ring part. Each support plate 61 has a support rod 62 on the side that is close to each other. The support rod 62 is hinged vertically to the corresponding support plate 61. A flat plate corresponding to the support rod 62 is fixedly connected to the support plate 61. The flat plate is located at the lower end of the support plate. When the support rod 62 is in its natural state, it is in contact with the plate. At this time, the support rod 62 is in a horizontal state, and the distance between the ends of all the support rods 62 that are close to each other is less than the outer diameter of the annular part.

[0053] Reference Figure 3 and Figure 6After the annular part is processed, the swing arm is reset and the blanking plate 5 is moved closer to the stamping die 11. When the blanking plate 5 moves, it drives the translation plate 53 to directly contact the inclined surface of the guide block 433, and drives the rotating rod 431 to move down through the guide block 433. When the rotating rod 431 moves, it drives the positioning wheel 41 to descend until the upper end of the positioning wheel 41 is lower than the upper end of the stamping die 11. A right-angle rod 51 is also fixedly connected to the upper end of the blanking plate 5. The upper end of the right-angle rod 51 extends towards the stamping die 11, and a hanging rod 52 is vertically hinged to the upper end of the rod. The hinge direction of the hanging rod 52 is the same as the moving direction of the blanking plate 5.

[0054] Reference Figure 6 and Figure 7 A stop block 511 is fixedly connected to the end of the right-angle rod 51 away from the blanking plate 5. The stop block 511 is located on the side of the hanging rod 52 near the stamping die 11. An elastic element 512 is also provided between the hanging rod 52 and the right-angle rod 51. The elastic element 512 is a torsion spring, with one end fixedly connected to the hanging rod 52 and the other end fixedly connected to the right-angle rod 51. In its natural state, the hanging rod 52 is in contact with the stop block 511, and the hanging rod 52 is in a vertical state.

[0055] Reference Figure 6 and Figure 7 After the positioning wheel 41 moves down, the feeding plate 5 continues to drive the hanging rod 52 to approach the annular part. When the hanging rod 52 contacts the outer edge of the annular part, under the blocking action of the annular part, the hanging rod 52 separates from the stop block 511 and avoids the annular part. When the hanging rod 52 moves to the inner side of the annular part, the elastic element 512 drives the hanging rod 52 to reset. At this time, the feeding plate 5 resets in the direction away from the stamping die 11, and then drives the annular part to move out from above the stamping die 11 through the hanging rod 52. The upper end of the frame 1 is fixedly connected with a support rail 15 for supporting the annular part. Under the support of the support rail 15, the feeding plate 5 drives the annular part to move to the inner side of the feeding rack.

[0056] Reference Figure 2 and Figure 7The frame 1 is also provided with a top plate 16, which is located between multiple feeding racks and is slidably connected to the frame 1 vertically. In its natural state, the top plate 16 is located above the feeding plate 5, and the upper surface of the top plate 16 is lower than the upper surface of the right-angle plate to prevent the annular part from colliding with the top plate 16 when it moves. The length of the top plate 16 is greater than the diameter of the annular part. When the annular part is between all the support plates 61, it is located directly above the top plate 16. The feeding plate 5 is provided with a lifting member for driving the top plate 16 upward. The lifting member includes a push plate 54 and a return spring 541. The push plate 54 is located above the feeding plate 5 and is hinged to the feeding plate 5 horizontally. A return spring 541 is provided between the push plate 54 and the feeding plate 5. One end of the return spring 541 is fixedly connected to the feeding plate 5, and the other end is fixedly connected to the push plate 54. The height of the upper surface of the push plate 54 is lower than the height of the lower surface of the top plate 16.

[0057] Reference Figure 2 and Figure 7 A ramp 161 corresponding to the push plate 54 is fixedly connected to the lower end of the top plate 16. The ramp 161 is vertically arranged, and the end face of the ramp 161 facing away from the stamping die 11 is inclined. The inclined surface is inclined from top to bottom towards the stamping die 11. A stop block 542 is fixedly connected to the upper end of the blanking plate 5. The stop block 542 is located on the side of the push plate 54 facing away from the stamping die 11. In the natural state of the return spring 541, the push plate 54 abuts against the stop block 542, and at this time the ramp 54 and the inclined surface of the ramp 161 are directly opposite each other. When the blanking plate 5 moves closer to the stamping die 11 again, the annular part stops above the support rail 15, and the ramp 54 contacts the inclined surface of the ramp 161. As the blanking plate 5 continues to move, the push plate 54 and the ramp 161 cooperate to drive the top plate 16 to move upward. The top plate 16 lifts the annular part, causing the annular part to move closer to the support rod 62.

[0058] Reference Figure 2 and Figure 7 When the annular part contacts the lower end face of the support rod 62, it pushes the support rod 62 to flip upward. At this time, the support rod 62 avoids the annular part, and the top plate 16 continues to rise until the support rod 62 separates from the annular part. Under the action of gravity, the support rod 62 contacts the plate again. The end face of the inclined plate 161 near the stamping die 11 is a vertical plane. When the push plate 54 moves to the vertical plane, it separates from the inclined plate 161. At this time, the top plate 16 resets under the action of gravity, and the annular part falls above the support rod 62. At this time, all the support rods 62 cooperate to support the annular part. When the unloading plate 5 drives another annular part to continue moving towards the unloading rack, the push plate 54 contacts the vertical plane of the inclined plate 161. At this time, the push plate 54 rotates towards the stamping die 11 under the blocking action of the inclined plate 161, and the top plate 16 remains stationary. The annular parts on the support rod 62 are stacked one after another, which facilitates the stacking of the annular parts and improves the processing convenience.

[0059] The working principle of an automatic stamping equipment for stamping automotive sheet metal parts according to an embodiment of this application is as follows: The pusher plate 21 and the straight plate 22 work together to push the annular part material above the stamping die 11. Positioning wheels 41 and 42 work together to clamp and position the annular part, making it coaxial with the rotating roller 3. The position where the annular part needs to be punched is located between the stamping die 11 and the punch 12. The punch 12 punches the first hole in the annular part, and the pusher moves the moving ring 32 downwards. Under the action of the guide groove 351 and the slider 343, the swing arm moves the positioning rod 36 to directly above the first punch hole in the annular part, and the positioning rod 36 is inserted into the punch hole of the annular part. The rotating roller 3 is driven by motor 311 to rotate intermittently, which causes the swing arm to rotate the ring part intermittently. When the ring part stops intermittently, the punch 12 sequentially punches out the remaining holes on the ring part, thereby completing the punching of multiple holes in the circumference of the ring part. There is no need to manually rotate the ring part during the punching process, which is conducive to improving the automation level of the punching of the ring part and the stamping efficiency.

[0060] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic stamping equipment for stamping automotive sheet metal parts, comprising a frame (1), a stamping die (11) and a punch (12) provided at the upper end of the frame (1), the stamping die (11) being connected to the frame (1), and the punch (12) being located directly above the stamping die (11) and reciprocating vertically, characterized in that, Also includes: The feeding component is set at the upper end of the frame (1) to push the ring part to the upper part of the stamping die (11). The upper end of the frame (1) is also provided with a support roller (13). When the ring part is above the stamping die (11), the support roller (13) supports the ring part and keeps the ring part in a horizontal state. The rotating roller (3) is located on the side of the stamping die (11) away from the loading part and is rotatably connected to the frame (1) in the transverse direction. When the ring part is in the waiting state, it is coaxial with the rotating roller (3). The frame (1) is provided with a drive member (31) for driving the rotating roller (3) to rotate. A moving ring (32) is slidably connected to the outside of the rotating roller (3) along the axial direction. The frame (1) is fixed with a pusher for driving the moving ring (32) to move. A swing arm is provided under the moving ring (32). The swing arm is rotatably connected to the moving ring (32) with the rotating roller (3) as the center. The swing arm is away from the moving ring. (32) has a positioning rod (36) at one end. The positioning rod (36) is set vertically and the diameter of the positioning rod (36) is the same as the diameter of the punch (12). The outer circle of the rotating roller (3) has a spirally set guide groove (351) along the circumferential direction. The swing arm is fixedly connected to a slider (343) that is adapted to the guide groove (351). The slider (343) is located in the guide groove (351) and is slidably connected to the rotating roller (3) along the guide groove (351). When the slider (343) is located at the lower end of the guide groove (351), the positioning rod (36) is located directly above the stamping die (11). The positioning wheel set is arranged around the circumference of the rotating roller (3) and is used to limit the ring part so that the ring part remains coaxial with the rotating roller (3).

2. The automatic stamping equipment for stamping automotive sheet metal parts according to claim 1, characterized in that: The positioning wheel set includes a positioning wheel one (41) and two positioning wheels two (42). The positioning wheel one (41) is located on the side of the rotating roller (3) away from the positioning mold. The upper end of the frame (1) is provided with a support block (43) for supporting the positioning wheel one (41). The positioning wheel one (41) is located above the support block (43) and rotates in the horizontal direction. The two positioning wheels two (42) are both located on the side of the rotating roller (3) away from the support block (43). The upper end of the frame (1) is provided with two sets of symmetrical moving seats (44) centered on the stamping mold (11). The moving seats (44) correspond one-to-one with the positioning wheels two (42). The positioning wheels two (42) are rotatably connected to the corresponding moving seats (44) in the horizontal direction. The frame (1) is provided with a clamping member (45) for driving the two sets of moving seats (44) to move closer or further away from each other. In the working state, the upper surfaces of the positioning wheel one (41) and the positioning wheel two (42) are higher than the upper surface of the stamping mold (11).

3. The automatic stamping equipment for stamping automotive sheet metal parts according to claim 1, characterized in that: The swing arm includes a connecting part (341) and an adjusting part (342). The connecting part (341) is located below the moving ring (32) and rotates coaxially with the moving ring (32). The slider (343) is fixedly connected to the connecting part (341). An extension arm (344) is fixedly connected laterally to the end face of the connecting part (341) away from the axis of the rotating roller (3). The adjusting part (342) is located on the side of the extension arm (344) away from the connecting part (341) and along the moving ring (342). 2) The extension arm (344) is slidably connected in the diameter direction. The extension arm (344) is provided with a moving rod (345) for driving the adjustment arm to move. The positioning rod (36) is located at the lower end of the adjustment part (342) and is slidably connected to the adjustment part (342) in the vertical direction. An elastic element (346) is provided between the adjustment part (342) and the positioning rod (36). In the natural state of the elastic element (346), the lower end face of the positioning rod (36) is lower than the lower end face of the adjustment part (342).

4. The automatic stamping equipment for stamping automotive sheet metal parts according to claim 1, characterized in that: The drive component (31) includes a motor (311), an intermittent wheel assembly (312), and a sprocket assembly (313). The frame (1) is rotatably connected to a linkage shaft (14) parallel to the rotating roller (3). The sprocket assembly (313) is located between the linkage shaft (14) and the rotating roller (3). When the linkage shaft (14) rotates, it drives the rotating roller (3) to rotate through the sprocket assembly (313). The motor (311) is fixedly connected to the frame (1). The intermittent wheel assembly is located between the motor (311) and the linkage shaft (14). The motor (311) drives the linkage shaft (14) to rotate intermittently through the intermittent wheel assembly (312). The intermittent rotation angle of the linkage shaft (14) is adapted to the arc between two adjacent punches on the annular part.

5. The automatic stamping equipment for stamping automotive sheet metal parts according to claim 2, characterized in that: The stamping die (11) has a blanking plate (5) on the side away from the loading part. The blanking plate (5) is reciprocating in the direction of approaching or moving away from the stamping die (11). A hanging rod (52) is vertically hinged to the upper end of the blanking plate (5), and a stop block (511) is fixedly connected to the blanking plate (5). The stop block (511) is located on the side of the hanging rod (52) close to the stamping die (11). An elastic element two (512) is provided between the hanging rod (52) and the blanking plate (5). In the natural state of the elastic element two (512), the hanging rod (52) abuts against the stop block (511) and is in a vertical state. The support block (43) also includes a positioning wheel one (41) for supporting the positioning wheel one (41). A rotating rod (431) is provided between the rotating rod (431) and the support block (43). The rotating rod (431) passes through the support block (43) along the axial direction and is rotatably connected to the support block (43). An elastic element (432) is provided between the rotating rod (431) and the support mold. The elastic element (432) supports the positioning wheel (41) through the rotating rod (431). A guide block (433) is fixed at the lower end of the rotating rod (431). The blanking plate (5) is provided with a translation plate (53) corresponding to the guide block (433). When the blanking plate (5) approaches the stamping mold (11), the translation plate (53) contacts the guide plate and drives the rotating rod (431) to move down through the guide plate, so that the positioning wheel (41) avoids the ring part.

6. The automatic stamping equipment for stamping automotive sheet metal parts according to claim 5, characterized in that: It also includes a feeding rack, which is located on the side of the rotating roller (3) away from the stamping die (11). The feeding rack includes multiple support plates (61), which are all located at the upper end of the frame (1) and are arranged in a ring. When the unloading plate (5) is working, it will move the ring part between all the support plates (61). The upper end of the frame (1) is provided with a support rail (15) for supporting the movement of the ring part. The support plates (61) are all vertically hinged with a support rod (62) on the side that is close to each other. The support rod (62) is in a horizontal state in its natural state. The frame (1) is vertically slidably connected with a top plate (16). The unloading plate (5) is provided with a lifting member for pushing the top plate (16) to move vertically. When the ring part is located between all the support plates (61), it is directly above the top plate (16).

7. The automatic stamping equipment for stamping automotive sheet metal parts according to claim 6, characterized in that: The lifting component includes a push plate (54) and a return spring (541). The lower end of the top plate (16) is fixedly connected to an inclined plate (161). The inclined plate (161) is inclined from top to bottom toward the stamping die (11) on the end face away from the stamping die (11). The end face of the inclined plate (161) near the stamping die (11) is a vertical plane. The push plate (54) is located above the blanking plate (5) and is rotatably connected to the blanking plate (5) in the transverse direction. The upper end of the blanking plate (5) is fixedly connected to a stop block (542). The stop block (542) is located on the side of the push plate (54) away from the stamping die (11). The return spring (541) is located between the push plate (54) and the stop block (542). In the natural state of the return spring (541), the push plate (54) and the stop block (542) abut against each other, and the push plate (54) and the inclined plate (161) are directly opposite each other.

8. The automatic stamping equipment for stamping automotive sheet metal parts according to claim 1, characterized in that: The feeding component includes a push plate (21), two straight plates (22), a power component (23), and a return spring (24). The push plate (21) is slidably connected to the frame (1) in the direction of approaching or moving away from the stamping die (11). The power component (23) is fixedly connected to the frame (1) and is used to drive the push plate (21) to move. The upper surface of the push plate (21) is higher than the upper surface of the stamping die (11). The two straight plates (22) are located on both sides of the push plate (21) and are slidably connected to the push plate (21) in the sliding direction of the push plate (21). The upper surface of the straight plate (22) is flush with the upper surface of the stamping die (11). The return spring (24) is located between the straight plate (22) and the push plate (21). In its natural state, the straight plate (22) extends towards the stamping die (11).

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