A stamping device for stress-relieving sheet metal

Abstract

This invention discloses a stress-relief stamping device for sheet metal, relating to the field of sheet metal stamping technology. It includes a frame, a stamping unit, a pre-leveling unit, an unloading unit, and a shaping unit. The frame provides a mounting base. The stamping unit is used for stamping and forming the sheet metal. The pre-leveling unit is used for pre-leveling and stress relief before stamping. The unloading unit is used for unloading peak impact during stamping. The shaping unit is used for rolling and shaping the cut edges of the formed part. After the sheet metal is placed, during the stamping process, the pre-leveling unit eliminates the initial internal stress and warping of the raw material, preventing stress accumulation during stamping. The unloading unit disperses the stress waves generated during stamping, preventing stress concentration in the forming area. The shaping unit reduces edge stress, improving the sheet metal forming quality.

Description

Technical Field

[0001] This invention relates to the field of sheet metal stamping technology, specifically a stress-relieving sheet metal stamping device. Background Technology

[0002] Stamping, as a core process in sheet metal processing, relies on stamping equipment to apply external force to plastically deform the sheet metal, thereby obtaining parts of the required shape and size. However, during the stamping process, a complex residual stress field inevitably arises within the sheet metal. These residual stresses primarily originate from: initial residual stresses left over from the sheet rolling process, internal stresses caused by uneven material flow during stamping deformation, and stresses hindering elastic recovery due to die constraints. The presence of these residual stresses directly leads to warping, cracking, or fatigue failure of stamped parts in subsequent processes (such as trimming, flanging, and assembly) or during service, severely impacting product quality and service life.

[0003] Before entering the stamping process, the sheet metal (such as sheet metal after coil leveling) already contains initial residual stress introduced by the rolling, leveling, or shearing processes. Traditional stamping equipment typically feeds this "stressed" sheet metal directly into the die for forming, leading to a stress superposition effect during the stamping process and exacerbating the deformation tendency of the final part. During the holding pressure stage of stamping (i.e., the period of time pressure is maintained after the slide reaches the bottom dead center), traditional processes believe that holding pressure helps suppress springback. However, research has found that prolonged holding pressure causes stress concentration in constrained areas such as die corners and draw beads. Due to the creep effect of the material under high pressure, the stress in localized areas continues to rise, even exceeding the material's yield strength, leading to the initiation of microcracks or structural damage.

[0004] After forming, stamped parts typically require trimming and flanging. In traditional processes, these steps are usually completed in subsequent secondary stamping or on specialized equipment. This "forming first, trimming later" separate process has two major drawbacks: First, trimming disrupts the original stress balance of the formed part, causing stress redistribution near the cut and triggering new warping deformation; second, the impact of the die during trimming and flanging can easily create micro-cracks or work-hardened layers at the edges, affecting the quality of subsequent welding or assembly. Summary of the Invention

[0005] The technical problem to be solved by the present invention is the stress relief of sheet metal, and a stress-relieving stamping device for sheet metal is provided.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] The stamping device includes several pre-leveling units, and a stamping unit is provided on one side of each pre-leveling unit. A controller is provided on each stamping unit.

[0008] The pre-leveling unit includes a pre-leveling component, which pre-levels the sheet metal as the position of the stamping unit changes. The pre-leveling component includes a leveling part and a transmission part, which are fixedly connected. The transmission part is fixedly connected to the stamping unit.

[0009] The pre-leveling unit is equipped with an unloading unit, which includes an unloading component. The unloading component performs an unloading action when the stamping unit holds pressure.

[0010] The stamping unit is equipped with several shaping units, each including a shaping component. The shaping component periodically changes the position of the unloading component to correct the sheet metal's position before stamping and to shape the edges after stamping. The shaping component includes a shaping part and a guide part, which are rotatably connected. The controller receives signals to control the unloading component, the stamping unit, and the guide part to move in a coordinated manner. Existing sheet metal stamping processes often lack pre-leveling, pressure holding and unloading, and post-stamping edge shaping processes, failing to eliminate internal stress in the sheet metal. This invention eliminates the initial internal stress and warping of the raw sheet metal material through the pre-leveling unit, preventing stress accumulation during stamping. The unloading unit disperses the stress waves generated during stamping, preventing stress concentration in the forming area. The shaping unit cuts off edge stress, improving the sheet metal forming quality.

[0011] Furthermore, the leveling component includes a rotating plate, an elastic telescopic plate, a connecting rod, a leveling roller, an arc-shaped spring, and a straight rod. The rotating plate and the straight rod are rotatably connected. The fixed end of the elastic telescopic plate is fixedly connected to the rotating plate. The telescopic end of the elastic telescopic plate is fixedly connected to one end of the connecting rod. The other end of the connecting rod is rotatably connected to the leveling roller. The arc-shaped spring is fixedly connected to the rotating plate. Existing leveling structures, which either lack a rigid structure or only have a rigid structure, are prone to leveling dead angles or surface damage to the material. This invention solves the technical problems of poor adaptability and easy damage to the material caused by rigid leveling components by setting a flexible leveling structure with an elastic telescopic plate and an arc-shaped spring, combined with a rotatable rotating plate and a rolling leveling roller.

[0012] Furthermore, the transmission component includes a pull rope, a first guide rod, a second guide rod, a cross plate, and a mounting frame. One end of the pull rope is fixedly connected to the telescopic end of the elastic telescopic plate, and the other end of the pull rope passes through the rotating plate, bypasses the first guide rod, and connects to the stamping unit of the second guide rod. The first guide rod is fixedly connected to the mounting frame, the second guide rod is fixedly connected to the mounting frame, the straight rod is fixedly connected to the mounting frame, the arc spring is fixedly connected to the mounting frame, and the cross plate is fixedly connected to the pull rope. Existing technologies suffer from complex pre-leveling transmission structures, high transmission resistance, and a tendency to jam, leading to untimely pre-leveling responses. This invention solves the technical problems of high transmission resistance and jamming by setting a flexible transmission structure with a pull rope and guide rod, combined with a cross plate to achieve tensioning and limiting of the pull rope.

[0013] Furthermore, the unloading assembly includes a guide rod, a drive coil, a conductive slip ring, a conductive disk, and a conductive block. The horizontal plate is fixedly connected to the conductive slip ring, the guide rod is fixedly connected to the mounting bracket, the drive coil is evenly wound on the guide rod, the conductive slip ring is slidably connected to the guide rod, the conductive slip ring is fixedly connected to the conductive disk through an insulating component, the conductive disk is not in contact with the guide rod, and the conductive block is fixedly connected to the guide rod. Existing technologies suffer from the problem of inaccurate matching between the triggering of the unloading action and the timing of the stamping and holding pressure. This invention solves the technical problem of mismatched unloading action timing by setting up an electromagnetic drive structure with a drive coil, conductive slip ring, and conductive disk, combined with a horizontal plate-linked stamping unit to achieve accurate triggering of the unloading action.

[0014] Furthermore, the end of the drive coil closest to the conductive block is the current transmission end.

[0015] Furthermore, the forming component includes a mounting plate, a support rod, a forming roller, and a guide frame. The mounting plate and the guide frame are slidably connected, the guide frame is fixedly connected to the mounting frame, the support rod is fixedly connected to the mounting plate, and the support rod is rotatably connected to the forming roller. Existing technologies suffer from the problem that the forming component is a rigid pressing structure, resulting in sliding friction with the sheet material, which easily scratches the sheet surface and causes incomplete stress relief during forming. This invention replaces the rigid pressing structure with a rolling forming roller, combined with a guide frame, to achieve smooth sliding of the forming component, thus solving the technical problems of easy scratching of the sheet material and incomplete stress relief during rigid forming.

[0016] Furthermore, the guide component includes an electric telescopic rod, a moving plate, and a rotating rod. The conductive slip ring is electrically connected to the electric telescopic rod, the telescopic end of the electric telescopic rod is fixedly connected to the moving plate, the moving plate is rotatably connected to the rotating rod, and the rotating rod is rotatably connected to the mounting plate. Existing technologies lack precise position adjustment in the guiding drive structure of the shaping component and have no electrical linkage with the unloading assembly. This invention, by setting an electric telescopic rod in conjunction with an adjustable-length rotating rod to form a guiding drive structure, and electrically linking it with the conductive slip ring, achieves precise position control of the shaping component and can adapt to the shaping needs of plates of different widths.

[0017] Furthermore, the stamping unit includes a telescopic motor, an upper die, a lower die, and a push plate. The telescopic end of the telescopic motor is fixedly connected to the upper die, the upper die is fixedly connected to the pull rope, a vibration motor is installed inside the upper die, the conductive block is electrically connected to the vibration motor, the fixed end of the electric telescopic rod is fixedly connected to the lower die, and the push plate is fixedly connected to the upper die.

[0018] Furthermore, the rotating rod has an adjustable length.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. In this invention, when the upper die moves downward, it drives the push plate to move downward and abut against the rotating plate, so that the leveling roller contacts the surface of the sheet material. At the same time, the pull rope fixedly connected to the upper die is pulled synchronously. The pull rope passes around the first guide rod and the second guide rod to change the direction of the pulling force, pulling the telescopic end of the elastic telescopic plate to retract towards the rotating plate. The retraction of the elastic telescopic plate drives the leveling roller on the connecting rod to perform rolling pre-leveling along the surface of the sheet material. By replacing sliding friction with rolling friction, the initial internal stress and warping deformation of the sheet material caused by rolling and storage are completely eliminated, avoiding the superposition of initial stress and deformation stress during stamping. When the leveling roller moves to the limit position as the elastic telescopic plate retracts, the pressure of the push plate on the rotating plate is always present. During the rotation of the rotating plate around the straight rod, the arc spring is compressed and enters the storage space between the lower die and the mounting frame, thereby completing the pre-leveling treatment of the sheet material.

[0021] 2. In this invention, when the upper die descends to the bottom dead center, the sheet metal completes plastic deformation, and the stamping unit enters the pressure holding stage. The upper die pulls the pull rope, causing the horizontal plate to slide along the guide rod until the conductive disk and conductive block contact, forming a conductive circuit. This allows the controller's current to be transmitted to the vibration motor through the conductive disk and conductive block. The vibration motor then starts to perform high-frequency micro-vibration on the sheet metal in the pressure holding state, quickly dispersing the stress waves accumulated in the sheet metal forming area during the stamping and pressure holding stage. This prevents stress from concentrating in the core area of ​​the forming area and suppresses the springback deformation caused by the elastic recovery of the sheet metal, thereby reducing the generation of residual stress from the source.

[0022] 3. In this invention, as the conductive slip ring slides upward along the guide rod, the effective number of turns of the drive coil connected to the circuit gradually increases, thereby increasing the effective resistance of the circuit. This causes the current supplied by the controller to the electric telescopic rod to gradually decrease, thus causing the electric telescopic rod to retract. Under the transmission action of the moving plate and the rotating rod, the mounting plate is driven to move along the guide frame to both ends, causing the forming roller to roll along the edge of the sheet metal. At this time, the moving plate is close to the edge of the sheet metal and works with the forming roller to correct the offset of the sheet metal, realizing the function of correcting the posture of the sheet metal before stamping. During the stamping process, when the upper die moves upward, the pressure of the push plate on the rotating plate gradually disappears. At this time, under the action of the self-restoring force of the arc spring, the rod retracts. The rotating plate rotates in the opposite direction, causing the leveling roller to detach from the storage area and roll inward under the action of the elastic telescopic plate, rolling the formed sheet material to eliminate warping. Meanwhile, the tension of the pull rope is gradually released, and the conductive slip ring slides along the guide rod to the initial position, gradually increasing the current flowing through the electric telescopic rod. The electric telescopic rod extends outward, and through the moving plate and rotating rod, it drives the mounting plate to move closer to each other along the guide frame, thereby driving the forming roller to perform rolling and shaping along the cut edge of the stamped part. The rolling friction of the forming roller replaces the traditional rigid pressing, which not only effectively eliminates the residual edge stress generated during the cutting process, but also corrects the angle deviation of the warping of the cut edge, while avoiding scratches on the surface of the formed part, thus improving the edge quality and dimensional accuracy of the formed part. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention;

[0024] Figure 2 for Figure 1 Another perspective structural diagram;

[0025] Figure 3 for Figure 2 A partial enlarged view of the structure at point A in the middle;

[0026] Figure 4 for Figure 3 A partial enlarged view of the structure at point B in the middle;

[0027] Figure 5 This is a schematic diagram of the installation position structure of the pre-leveling unit of the present invention;

[0028] Figure 6 for Figure 5 A partial enlarged view of the structure at point C;

[0029] Figure 7 This is a schematic diagram of the installation position of the straight rod and guide frame of the present invention;

[0030] Figure 8 for Figure 7 A partial enlarged view of the structure at point D.

[0031] In the diagram: 1. Frame; 2. Stamping unit; 21. Telescopic motor; 22. Upper die; 23. Lower die; 24. Push plate; 3. Pre-leveling unit; 31. Turning plate; 32. Elastic telescopic plate; 33. Connecting rod; 34. Leveling roller; 35. Arc spring; 36. Straight rod; 37. Pull rope; 38. First smooth rod; 39. Second smooth rod; 310. Horizontal plate; 311. Mounting frame; 4. Unloading unit; 41. Guide rod; 42. Drive coil; 43. Conductive slip ring; 44. Conductive disk; 45. Conductive block; 5. Shaping unit; 51. Mounting plate; 52. Support rod; 53. Shaping roller; 54. Guide frame; 55. Electric telescopic rod; 56. Moving plate; 57. Rotating rod. Detailed Implementation

[0032] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example: Figures 1-8 As shown, the present invention provides the following technical solution:

[0034] like Figure 1 , Figure 4 As shown, the stamping device includes several pre-leveling units 3, and a stamping unit 2 is provided on one side of the pre-leveling unit 3. A controller is provided on the stamping unit 2.

[0035] The pre-leveling unit 3 includes a pre-leveling component. The pre-leveling component pre-levels the sheet metal as the position of the stamping unit 2 changes. The pre-leveling component includes a leveling component and a transmission component. The leveling component and the transmission component are fixedly connected. The transmission component is fixedly connected to the stamping unit 2.

[0036] The pre-leveling unit 3 is equipped with an unloading unit 4, which includes an unloading component. The unloading component performs an unloading action when the stamping unit 2 holds pressure.

[0037] The stamping unit 2 is provided with several shaping units 5. The shaping unit 5 includes a shaping component. The shaping component performs position correction of the sheet metal before stamping and edge shaping after stamping by periodically changing the position of the unloading component. The shaping component includes a shaping part and a guide part. The shaping part and the guide part are rotatably connected. The controller receives signals to control the unloading component, the stamping unit 2 and the guide part to move in a unified and coordinated manner.

[0038] The frame 1 is used to provide a mounting base for the stamping unit 2, the pre-leveling unit 3, the unloading unit 4, and the shaping unit 5.

[0039] like Figures 5-7As shown, the leveling component includes a rotating plate 31, an elastic telescopic plate 32, a connecting rod 33, a leveling roller 34, an arc spring 35, and a straight rod 36. The rotating plate 31 and the straight rod 36 are rotatably connected. The fixed end of the elastic telescopic plate 32 is fixedly connected to the rotating plate 31. The telescopic end of the elastic telescopic plate 32 is fixedly connected to one end of the connecting rod 33. The other end of the connecting rod 33 is rotatably connected to the leveling roller 34. The arc spring 35 is fixedly connected to the rotating plate 31.

[0040] like Figure 3 , Figure 4 , Figure 6 As shown, the transmission components include a pull rope 37, a first guide rod 38, a second guide rod 39, a horizontal plate 310, and a mounting bracket 311. One end of the pull rope 37 is fixedly connected to the telescopic end of the elastic telescopic plate 32, and the other end of the pull rope 37 passes through the rotating plate 31, passes around the first guide rod 38, and connects to the stamping unit 2 of the second guide rod 39. The first guide rod 38 is fixedly connected to the mounting bracket 311, the second guide rod 39 is fixedly connected to the mounting bracket 311, the straight rod 36 is fixedly connected to the mounting bracket 311, the arc spring 35 is fixedly connected to the mounting bracket 311, and the horizontal plate 310 is fixedly connected to the pull rope 37.

[0041] When the upper die 22 moves downward, it drives the push plate to move downward and abut against the rotating plate 31, so that the leveling roller 34 contacts the surface of the plate. At the same time, the pull rope 37, which is fixedly connected to the upper die 22, is pulled synchronously. The pull rope 37 passes around the first guide rod 38 and the second guide rod 39 to change the direction of the pulling force, and pulls the telescopic end of the elastic telescopic plate 32 to retract towards the rotating plate 31. The retraction of the elastic telescopic plate 32 drives the leveling roller 34 on the connecting rod 33 to perform rolling pre-leveling along the surface of the plate. By replacing sliding friction with rolling friction, the initial internal stress and warping deformation of the plate caused by rolling and storage are completely eliminated, and the superposition of initial stress and deformation stress during stamping is avoided. When the elastic telescopic plate 32 retracts and drives the leveling roller 34 to move to the limit position, the pressure of the push plate on the rotating plate 31 is always present. During the rotation of the rotating plate 31 around the straight rod 36, the arc spring 35 is compressed and enters the storage space between the lower die 23 and the mounting frame 311, thereby completing the pre-leveling treatment of the plate.

[0042] like Figure 4 As shown, the unloading assembly includes a guide rod 41, a drive coil 42, a conductive slip ring 43, a conductive disk 44, and a conductive block 45. The horizontal plate 310 is fixedly connected to the conductive slip ring 43, the guide rod 41 is fixedly connected to the mounting bracket 311, the drive coil 42 is evenly wound on the guide rod 41, the conductive slip ring 43 is slidably connected to the guide rod 41, the conductive slip ring 43 is fixedly connected to the conductive disk 44 through an insulating component, the conductive disk 44 is not in contact with the guide rod 41, and the conductive block 45 is fixedly connected to the guide rod 41.

[0043] like Figure 4 As shown, the end of the drive coil 42 closest to the conductive block 45 is the current transmission end.

[0044] When the upper die 22 descends to the bottom dead center, the sheet metal completes plastic deformation, and the stamping unit 2 enters the pressure holding stage. The upper die 22 pulls the pull rope 37, causing the horizontal plate 310 to drive the conductive slip ring 43 to slide along the guide rod 41 to contact the conductive disk 44 and the conductive block 45, forming a conductive circuit. This allows the controller's current to be transmitted to the vibration motor through the conductive disk 44 and the conductive block 45. The vibration motor starts to perform high-frequency micro-vibration on the sheet metal in the pressure holding state, quickly dispersing the stress waves accumulated in the sheet metal forming area during the stamping and pressure holding stage, preventing stress from concentrating in the core part of the forming area, and suppressing the springback deformation of the sheet metal due to elastic recovery, thereby reducing the generation of residual stress from the root.

[0045] like Figure 7 , Figure 8 As shown, the shaping component includes a mounting plate 51, a support rod 52, a shaping roller 53, and a guide frame 54. The mounting plate 51 and the guide frame 54 are slidably connected, the guide frame 54 is fixedly connected to the mounting frame 311, the support rod 52 is fixedly connected to the mounting plate 51, and the support rod 52 is rotatably connected to the shaping roller 53.

[0046] like Figure 8 As shown, the guide includes an electric telescopic rod 55, a movable plate 56, and a rotating rod 57. The conductive slip ring 43 is electrically connected to the electric telescopic rod 55. The telescopic end of the electric telescopic rod 55 is fixedly connected to the movable plate 56. The movable plate 56 is rotatably connected to the rotating rod 57. The rotating rod 57 is rotatably connected to the mounting plate 51.

[0047] As the conductive slip ring 43 slides upward along the guide rod 41, the effective number of turns of the drive coil 42 connected to the circuit gradually increases, thereby increasing the effective resistance of the circuit. This causes the current supplied by the controller to the electric telescopic rod 55 to gradually decrease, thus causing the electric telescopic rod 55 to retract. Under the transmission action of the moving plate 56 and the rotating rod 57, the mounting plate 51 is driven to move along the guide frame 54 to both ends, causing the forming roller 53 to roll along the edge of the sheet metal. At this time, the moving plate 56 is close to the edge of the sheet metal and works with the forming roller 53 to readjust the offset of the sheet metal, realizing the function of correcting the posture of the sheet metal before stamping. During the stamping process, when the upper die 22 moves upward, the pressure of the push plate on the rotating plate 31 gradually disappears. At this time, under the action of the self-restoring force of the arc spring 35, the rotating plate 31 is driven to retract. Plate 31 rotates in the opposite direction, causing the leveling roller 34 to detach from the storage area and roll inward under the action of the elastic telescopic plate 32, rolling the formed plate to eliminate warping. Meanwhile, the tension of the pull rope 37 is gradually released, and the conductive slip ring 43 slides along the guide rod 41 to the initial position, gradually increasing the current flowing through the electric telescopic rod 55. The electric telescopic rod 55 extends outward and, through the moving plate 56 and rotating rod 57, drives the mounting plate 51 to move closer to each other along the guide frame 54, thereby driving the shaping roller 53 to perform rolling and shaping along the cut edge of the stamped part. The rolling friction of the shaping roller 53 replaces the traditional rigid pressing, which can not only effectively eliminate the residual edge stress generated during the cutting process, but also correct the angle deviation of the warping of the cutting edge, while avoiding scratches on the surface of the formed part, thus improving the edge quality and dimensional accuracy of the formed part.

[0048] like Figure 2 , Figure 6 As shown, the stamping unit 2 includes a telescopic motor 21, an upper die 22, a lower die 23, and a push plate 24. The telescopic end of the telescopic motor 21 is fixedly connected to the upper die 22. The upper die 22 is fixedly connected to the pull rope 37. A vibration motor is installed inside the upper die 22. The conductive block 45 is electrically connected to the vibration motor. The fixed end of the electric telescopic rod 55 is fixedly connected to the lower die 23. The push plate 24 is fixedly connected to the upper die 22.

[0049] The controller starts the telescopic motor 21. The telescopic end of the telescopic motor 21 drives the upper mold 22 to move downward in a pre-pressing motion. The downward movement of the upper mold 22 performs a stamping forming action on the sheet metal on the lower mold 23.

[0050] like Figure 8 As shown, the rotating rod 57 has an adjustable length.

[0051] If there are differences in the cutting width and flanging angle of the molded parts, the rolling position and rolling pressure of the shaping roller 53 can be changed by adjusting the length of the rotating rod 57 and coordinating with the extension stroke of the electric telescopic rod 55, so as to adapt to the edge shaping requirements of molded parts of different specifications.

[0052] Working principle of the invention:

[0053] When the upper die 22 moves downward, it drives the push plate to move downward and abut against the rotating plate 31, so that the leveling roller 34 contacts the surface of the plate. At the same time, the pull rope 37, which is fixedly connected to the upper die 22, is pulled synchronously. The pull rope 37 passes around the first guide rod 38 and the second guide rod 39 to change the direction of the pulling force, and pulls the telescopic end of the elastic telescopic plate 32 to retract towards the rotating plate 31. The retraction of the elastic telescopic plate 32 drives the leveling roller 34 on the connecting rod 33 to perform rolling pre-leveling along the surface of the plate. By replacing sliding friction with rolling friction, the initial internal stress and warping deformation of the plate caused by rolling and storage are completely eliminated, and the superposition of initial stress and deformation stress during stamping is avoided. When the elastic telescopic plate 32 retracts and drives the leveling roller 34 to move to the limit position, the pressure of the push plate on the rotating plate 31 is always present. During the rotation of the rotating plate 31 around the straight rod 36, the arc spring 35 is compressed and enters the storage space between the lower die 23 and the mounting frame 311, thereby completing the pre-leveling treatment of the plate.

[0054] When the upper die 22 descends to the bottom dead center, the sheet metal completes plastic deformation, and the stamping unit 2 enters the pressure holding stage. The upper die 22 pulls the pull rope 37, causing the horizontal plate 310 to drive the conductive slip ring 43 to slide along the guide rod 41 to contact the conductive disk 44 and the conductive block 45, forming a conductive circuit. This allows the controller's current to be transmitted to the vibration motor through the conductive disk 44 and the conductive block 45. The vibration motor starts to perform high-frequency micro-vibration on the sheet metal in the pressure holding state, quickly dispersing the stress waves accumulated in the sheet metal forming area during the stamping and pressure holding stage, preventing stress from concentrating in the core part of the forming area, and suppressing the springback deformation of the sheet metal due to elastic recovery, thereby reducing the generation of residual stress from the root.

[0055] As the conductive slip ring 43 slides upward along the guide rod 41, the effective number of turns of the drive coil 42 connected to the circuit gradually increases, thereby increasing the effective resistance of the circuit. This causes the current supplied by the controller to the electric telescopic rod 55 to gradually decrease, thus causing the electric telescopic rod 55 to retract. Under the transmission action of the moving plate 56 and the rotating rod 57, the mounting plate 51 is driven to move along the guide frame 54 to both ends, causing the forming roller 53 to roll along the edge of the sheet metal. At this time, the moving plate 56 is close to the edge of the sheet metal and works with the forming roller 53 to readjust the offset of the sheet metal, realizing the function of correcting the posture of the sheet metal before stamping. During the stamping process, when the upper die 22 moves upward, the pressure of the push plate on the rotating plate 31 gradually disappears. At this time, under the action of the self-restoring force of the arc spring 35, the rotating plate 31 is driven to retract. Plate 31 rotates in the opposite direction, causing the leveling roller 34 to detach from the storage area and roll inward under the action of the elastic telescopic plate 32, rolling the formed plate to eliminate warping. Meanwhile, the tension of the pull rope 37 is gradually released, and the conductive slip ring 43 slides along the guide rod 41 to the initial position, gradually increasing the current flowing through the electric telescopic rod 55. The electric telescopic rod 55 extends outward and, through the moving plate 56 and rotating rod 57, drives the mounting plate 51 to move closer to each other along the guide frame 54, thereby driving the shaping roller 53 to perform rolling and shaping along the cut edge of the stamped part. The rolling friction of the shaping roller 53 replaces the traditional rigid pressing, which can not only effectively eliminate the residual edge stress generated during the cutting process, but also correct the angle deviation of the warping of the cutting edge, while avoiding scratches on the surface of the formed part, thus improving the edge quality and dimensional accuracy of the formed part.

[0056] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stamping device for stress-relieving sheet metal, characterized in that: The stamping device includes several pre-leveling units (3), and a stamping unit (2) is provided on one side of the pre-leveling unit (3). A controller is provided on the stamping unit (2). The pre-leveling unit (3) includes a pre-leveling component. The pre-leveling component performs pre-leveling on the sheet metal as the position of the stamping unit (2) changes. The pre-leveling component includes a leveling component and a transmission component. The leveling component and the transmission component are fixedly connected. The transmission component is fixedly connected to the stamping unit (2). The pre-leveling unit (3) is provided with an unloading unit (4), the unloading unit (4) includes an unloading component, and the unloading component performs an unloading action when the stamping unit (2) holds pressure; The stamping unit (2) is provided with several shaping units (5). The shaping unit (5) includes a shaping component. The shaping component performs position correction of the sheet metal before stamping and edge shaping after stamping by periodically changing the position of the unloading component. The shaping component includes a shaping part and a guide part. The shaping part and the guide part are rotatably connected. The controller receives signals to control the unloading component, the stamping unit (2) and the guide part to move in a unified and coordinated manner.

2. The stamping device for stress-relieving sheet metal according to claim 1, characterized in that: The leveling component includes a rotating plate (31), an elastic telescopic plate (32), a connecting rod (33), a leveling roller (34), an arc spring (35), and a straight rod (36). The rotating plate (31) and the straight rod (36) are rotatably connected. The fixed end of the elastic telescopic plate (32) is fixedly connected to the rotating plate (31). The telescopic end of the elastic telescopic plate (32) is fixedly connected to one end of the connecting rod (33). The other end of the connecting rod (33) is rotatably connected to the leveling roller (34). The arc spring (35) is fixedly connected to the rotating plate (31).

3. The stamping device for stress-relieving sheet metal according to claim 2, characterized in that: The transmission components include a pull rope (37), a first guide rod (38), a second guide rod (39), a horizontal plate (310), and a mounting bracket (311). One end of the pull rope (37) is fixedly connected to the telescopic end of the elastic telescopic plate (32), and the other end of the pull rope (37) passes through the rotating plate (31), passes around the first guide rod (38), and connects to the stamping unit (2) of the second guide rod (39). The first guide rod (38) is fixedly connected to the mounting bracket (311), the second guide rod (39) is fixedly connected to the mounting bracket (311), the straight rod (36) is fixedly connected to the mounting bracket (311), the arc spring (35) is fixedly connected to the mounting bracket (311), and the horizontal plate (310) is fixedly connected to the pull rope (37).

4. The stamping device for stress-relieving sheet metal according to claim 3, characterized in that: The unloading assembly includes a guide rod (41), a drive coil (42), a conductive slip ring (43), a conductive disk (44), and a conductive block (45). The horizontal plate (310) is fixedly connected to the conductive slip ring (43). The guide rod (41) is fixedly connected to the mounting bracket (311). The drive coil (42) is evenly wound on the guide rod (41). The conductive slip ring (43) is slidably connected to the guide rod (41). The conductive slip ring (43) is fixedly connected to the conductive disk (44) through an insulating component. The conductive disk (44) does not contact the guide rod (41). The conductive block (45) is fixedly connected to the guide rod (41).

5. A stamping device for stress-relieving sheet metal according to claim 4, characterized in that: The end of the drive coil (42) closest to the conductive block (45) is the current transmission end.

6. The stamping device for stress-relieving sheet metal according to claim 4, characterized in that: The shaping component includes a mounting plate (51), a support rod (52), a shaping roller (53), and a guide frame (54). The mounting plate (51) and the guide frame (54) are slidably connected. The guide frame (54) and the mounting frame (311) are fixedly connected. The support rod (52) and the mounting plate (51) are fixedly connected. The support rod (52) and the shaping roller (53) are rotatably connected.

7. A stamping device for stress-relieving sheet metal according to claim 6, characterized in that: The guide includes an electric telescopic rod (55), a movable plate (56), and a rotating rod (57). The conductive slip ring (43) is electrically connected to the electric telescopic rod (55). The telescopic end of the electric telescopic rod (55) is fixedly connected to the movable plate (56). The movable plate (56) is rotatably connected to the rotating rod (57). The rotating rod (57) is rotatably connected to the mounting plate (51).

8. A stamping device for stress-relieving sheet metal according to claim 7, characterized in that: The stamping unit (2) includes a telescopic motor (21), an upper die (22), a lower die (23), and a push plate (24). The telescopic end of the telescopic motor (21) is fixedly connected to the upper die (22). The upper die (22) is fixedly connected to the pull rope (37). A vibration motor is installed inside the upper die (22). The conductive block (45) is electrically connected to the vibration motor. The fixed end of the electric telescopic rod (55) is fixedly connected to the lower die (23). The push plate (24) is fixedly connected to the upper die (22).

9. A stamping device for stress-relieving sheet metal according to claim 7, characterized in that: The rotating rod (57) has an adjustable length.

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