A punching and bending tooling for thin-walled metal parts

Abstract

The present invention relates to the technical field of punching and bending tooling, and specifically discloses a punching and bending tooling for thin-walled metal parts, comprising an upper mold mechanism, a lower mold mechanism, a conveying mechanism and a bottom plate, wherein an upper protective mechanism is provided on the conveying mechanism; the upper protective mechanism comprises a film-releasing assembly, a supporting assembly and a winding assembly, the film-releasing assembly is arranged on the conveying mechanism, a protective film is wound on the film-releasing assembly, and the supporting assembly is arranged on one side of the film-releasing assembly; the thin-walled metal part punching and bending tooling of the present invention conveys the plate to the lower mold mechanism through the conveying mechanism, and at the same time makes the protective film on the film-releasing assembly fall to the top of the plate around the movable roller, and then the protective film is wound along the top of the plate to the winding assembly, so that the protective film protects the top of the plate, and when the upper mold mechanism bends the plate, the protective film on the plate contacts the upper mold mechanism instead of the plate, thereby avoiding scratches caused by friction between the upper mold mechanism and the top of the plate.

Description

Technical Field

[0001] The invention relates to the technical field of punching and bending tooling, and in particular to a punching and bending tooling for thin-walled metal parts. Background Art

[0002] Thin-walled metal parts refer to components or structural parts made of metal with relatively thin walls (typically less than a few millimeters, even down to the micron level). Due to their thin walls, light weight, and low rigidity, these parts often face challenges such as deformation and precision control during processing and manufacturing. They are widely used in applications requiring lightweight, high-strength, and space-efficient components. The processing of thin-walled metal parts requires punching and bending, necessitating the use of punching and bending tooling.

[0003] The Chinese patent document with authorization announcement number CN115121711B discloses a stamping and forming device for profile processing, which includes a stamping die, a positioning assembly, a blanking assembly and a demolding assembly. The positioning assembly includes a clamping positioning mechanism and a clamping positioning mechanism; two horizontal mounting slots are symmetrically opened on the relative outer walls near the lower end of the stamping die, and each mounting slot is provided with a C-shaped support plate. The openings of the two C-shaped support plates are in opposite directions, and the upper ends of the two C-shaped support plates are fixedly connected to a horizontal top plate; the blanking assembly includes a square stamping block that is lifted and installed on the lower surface of the horizontal top plate. The square stamping block can be rotated to change its surface, and a blanking knife is provided on the side wall of the square stamping block.

[0004] However, the structural design of the above-mentioned related technology: although it can stamp and punch the workpiece at the same time, during the bending process of the thin-walled metal sheet, there will be greater friction between the sliding surface of the thin-walled metal sheet and the mold, which can easily cause large scratches on the thin-walled metal sheet after stamping. In severe cases, it may even cause the thin-walled metal sheet to be damaged, thereby affecting product quality.

[0005] Therefore, a thin-walled metal part punching and bending tool is proposed to solve the above problems. Summary of the Invention

[0006] The present invention provides a thin-walled metal part punching and bending tool, which aims to solve the problem in the related art that scratches are easily generated on the surface of thin-walled metal plates during the punching process.

[0007] The thin-walled metal part punching and bending tool of the present invention comprises an upper die mechanism, a lower die mechanism, a conveying mechanism and a bottom plate. The conveying mechanism is provided with an upper protective mechanism to prevent the top of the plate from being scratched.

[0008] The upper protective mechanism includes a film-laying assembly, a supporting assembly and a winding assembly. The film-laying assembly is arranged on the conveying mechanism. A protective film is wound on the film-laying assembly. The supporting assembly is arranged on one side of the film-laying assembly. The winding assembly is arranged on the bottom plate. The end of the protective film on the film-laying assembly passes around the supporting assembly and falls to the top of the plate. Then, it is wound onto the winding assembly along the moving direction of the plate, so that the protective film is laid on the top of the plate.

[0009] The supporting assembly includes a movable roller, two elastic parts and two sliding parts. The two elastic parts are respectively installed on both sides of the conveying mechanism. The sliding parts are elastically connected to the elastic parts along the vertical sliding direction. The movable roller is rotatably connected between the two sliding parts. The sliding parts are provided with a pressure rod, and the upper mold mechanism is provided with a pressure strip located above the pressure rod.

[0010] When punching and bending the sheet, the sheet is first conveyed to the lower mold mechanism through the conveying mechanism, and at the same time, the protective film on the film-releasing assembly falls around the movable roller to the top of the sheet, and then the protective film is wound along the top of the sheet to the winding assembly, so that the protective film protects the top of the sheet. When the upper mold mechanism bends the sheet, the protective film on the sheet replaces the sheet to contact the upper mold mechanism, thereby avoiding scratches caused by friction between the upper mold mechanism and the top of the sheet, thereby improving the processing quality of the sheet. In the process of the upper mold mechanism moving downward, the upper mold mechanism presses the pressure rod down through the pressure bar to lower the height of the movable roller to prevent the upper mold mechanism from pulling the film-releasing assembly to unwind through the protective film, and avoiding the protective film from extending too long to affect the subsequent conveying of the sheet.

[0011] Preferably, the film placing assembly includes a film placing roller and two support seats, the two support seats are both arranged on the conveying mechanism, the film placing roller is rotatably connected between the two support seats, and the protective film is wound on the film placing roller.

[0012] Preferably, the winding assembly includes a winding roller, a support roller and two support plates, the two support plates are installed on the base plate, the winding roller and the support roller are rotatably connected between the two support plates, the winding roller is located below the support roller, and the end of the protective film is arranged on the winding roller.

[0013] By rotating the winding roller, the used protective film can be rolled up to prevent the used protective film from continuing to act on the top of the plate, thereby further ensuring the processing quality of the plate.

[0014] Preferably, the conveying mechanism includes a support platform, a conveyor, a limit plate and a limit groove, the support platform is installed on the base plate, the conveyor is installed on the support platform, the limit plate is installed on the top of one side of the conveyor, and the limit groove is opened at the bottom of the limit plate.

[0015] Preferably, a lower protective mechanism is provided on one side of the conveying mechanism, and a protective film is provided on the lower protective mechanism. The lower protective mechanism can press the end of the protective film into the limiting groove so that the protective film is laid on the bottom of the plate to protect the bottom of the plate.

[0016] Preferably, the lower protective mechanism includes a retractable assembly, a film pressing assembly and two film winding assemblies. The retractable assembly is arranged on a support platform, the protective film is wound on the retractable assembly, the film pressing assembly is arranged on an elastic member, and the two film winding assemblies are respectively located on both sides of the conveyor and installed on the support platform.

[0017] Through the film winding assembly, the protective film can be driven to move into the limiting groove and pressed in the limiting groove so that the protective film is wrapped around the end of the plate. When the plate is conveyed to the lower mold mechanism, the plate can drive the retracting assembly to unwind so that the protective film covers the bottom of the plate to avoid scratches on the plate when it is conveyed to the lower mold mechanism, thereby further improving the processing quality of the plate.

[0018] Preferably, the retractable assembly includes a retractable roller and two connecting seats, both of which are mounted on a support platform, the retractable roller is rotatably connected between the two connecting seats, and a spring is provided between one of the connecting seats and the retractable roller.

[0019] When the plate is moved onto the lower mold mechanism, the protective film is released by the wrapping film assembly. At this time, the spring can drive the retracting roller to rotate to rewind the protective film so that the protective film can be reused.

[0020] Preferably, the film pressing assembly includes a pressure roller, a rotating rod and two vertical plates, the two vertical plates are respectively installed on two elastic members, the pressure roller and the rotating rod are rotatably connected between the two vertical plates, and a gap is provided between the pressure roller and the rotating rod for the protective film to pass through.

[0021] By cooperating with the pressure roller and the rotating rod, the recovered protective film can be guided so that the end of the protective film naturally droops onto the film winding assembly.

[0022] Preferably, the film winding assembly includes an inclined plate, a turntable and a film winding rod, the inclined plate is installed on the support platform, the turntable is rotatably connected to one side of the inclined plate, and the film winding rod is installed at an edge position of one end of the turntable.

[0023] Preferably, a cutting mechanism is provided between the lower mold mechanism and the support platform, and the cutting mechanism is located below the limiting plate to cut the plate.

[0024] By providing a cutting mechanism, the plates can be cut, so that the plates can be continuously fed without having to cut the plates in advance.

[0025] By adopting the above technical solution, the beneficial effects of the present invention are as follows: when punching and bending the plate, the plate is first conveyed to the lower mold mechanism through the conveying mechanism, and at the same time, the protective film on the film-releasing assembly falls around the movable roller to the top of the plate, and then the protective film is wound along the top of the plate to the winding assembly, so that the protective film protects the top of the plate. When the upper mold mechanism bends the plate, the protective film on the plate contacts the upper mold mechanism instead of the plate, thereby avoiding scratches caused by friction between the upper mold mechanism and the top of the plate, thereby improving the processing quality of the plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of a specific embodiment of the present invention.

[0027] Figure 2 It is a structural schematic diagram of the upper mold mechanism in a specific embodiment of the present invention.

[0028] Figure 3 Schematic diagram of the internal structure of the mounting base in a specific embodiment of the present invention.

[0029] Figure 4 It is a structural schematic diagram of a buffer assembly in a specific embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of the internal structure of the lower module in a specific embodiment of the present invention.

[0031] Figure 6 It is a structural schematic diagram of the upper protection mechanism in a specific embodiment of the present invention.

[0032] Figure 7 It is a structural schematic diagram of a mounting frame according to a specific embodiment of the present invention.

[0033] Figure 8 For the specific embodiment of the present invention Figure 7 Schematic diagram of the enlarged structure at point A in the middle.

[0034] Figure 9 Schematic diagram of the internal structure of the mounting plate of a specific embodiment of the present invention.

[0035] Figure 10 It is a structural schematic diagram of a winding assembly in a specific embodiment of the present invention.

[0036] Figure 11 It is a structural schematic diagram of the retractable assembly in a specific embodiment of the present invention.

[0037] Figure 12 It is a structural schematic diagram of a pressing roller in a specific embodiment of the present invention.

[0038] Figure 13It is a schematic structural diagram of a membrane winding assembly according to a specific embodiment of the present invention.

[0039] Reference numerals:

[0040] 10. Upper die mechanism; 11. Support frame; 12. Crossbeam; 13. Hydraulic cylinder 1; 14. Upper die assembly; 141. Mounting seat; 142. Fixed column; 143. Pressing strip; 144. Bending block; 145. Stamping part; 146. Movable rod; 147. Pressing block; 148. Slide; 15. Buffer assembly; 151. Slide rod; 152. Connecting plate 1; 153. Spring 1; 154. Connecting plate 2;

[0041] 20. Lower die mechanism; 21. Lower die block; 22. Punching hole; 23. Waste hole;

[0042] 30. Conveying mechanism; 31. Support platform; 32. Conveyor; 33. Limiting plate; 34. Limiting slot;

[0043] 40. Upper protection mechanism; 41. Film unwinding assembly; 411. Support seat; 412. Film unwinding roller; 42. Support assembly; 421. Mounting plate; 422. Slide plate; 423. Movable roller; 424. Pressure bar; 425. Support block; 426. Second spring; 43. Winding assembly; 431. Support plate; 432. Winding roller; 433. Motor 1; 434. Support roller;

[0044] 50. Lower protection mechanism; 51. Retractable assembly; 511. Retractable roller; 512. Connecting seat; 52. Film pressing assembly; 521. Vertical plate; 522. Pressing roller; 523. Rotating rod; 53. Film winding assembly; 531. Inclined plate; 532. Turntable; 533. Film winding rod; 534. Rotating rod; 535. Pulley 1; 54. Drive assembly; 541. Rotating shaft; 542. Vertical plate; 543. Pulley 2; 544. Motor 2;

[0045] 60. Cutting mechanism; 61. Mounting frame; 62. Hydraulic cylinder 2; 63. Sliding column; 64. Fixing plate; 65. Cutter; 66. Limiting rod; 67. Pressing plate; 68. Spring 3;

[0046] 70. Base plate. DETAILED DESCRIPTION

[0047] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0048] like Figures 1 to 13As shown, the thin-walled metal part punching and bending tool of the present invention includes an upper die mechanism 10, a lower die mechanism 20, a conveying mechanism 30, an upper protective mechanism 40, a lower protective mechanism 50, a cutting mechanism 60 and a base plate 70. The lower die mechanism 20 is installed on one side of the top of the base plate 70, and the upper die mechanism 10 is arranged above the lower die mechanism 20 to punch and bend the sheet material. The conveying mechanism 30 is installed on the other side of the top of the base plate 70 to convey the sheet material. The upper protective mechanism 40 is arranged on the conveying mechanism 30, and the lower protective mechanism 50 is arranged on one side of the conveying mechanism 30. A protective film is provided on the upper protective mechanism 40, and a protective film is provided on the lower protective mechanism 50 to protect the top and bottom of the sheet material. The cutting mechanism 60 is installed between the lower die mechanism 20 and the conveying mechanism 30 to cut the sheet material.

[0049] When punching a sheet, the conveying mechanism 30 drives the end of the sheet toward the top of the lower die mechanism 20. During this movement, the lower protective mechanism 50 releases a protective film to cover the bottom of the sheet, protecting it and reducing friction between the bottom of the sheet and the lower die mechanism 20, preventing the lower die mechanism 20 from scratching the sheet. Simultaneously, the upper protective mechanism 40 releases a protective film to cover the top of the sheet, protecting it from scratches caused by the upper die mechanism 10 when bending the sheet. When the sheet stops conveying, the lower protective mechanism 50 retracts the protective film, and the cutting mechanism 60 then cuts the sheet, allowing the sheet to be bent.

[0050] like Figures 1 to 2 As shown, there are support frames 11, crossbeam 12, hydraulic cylinder 13, upper mold assembly 14, and buffer assembly 15. There are two sets of support frames 11, each containing two support frames 11. The bottoms of the support frames 11 are mounted on top of the base plate 70, and the two sets of support frames 11 are mounted on either side of the crossbeam 12. Hydraulic cylinder 13 is mounted on top of the crossbeam 12, and the upper mold assembly 14 is mounted on the movable end of hydraulic cylinder 13. There are two buffer assemblies 15, one on each side of the upper mold assembly 14.

[0051] When punching the sheet, the hydraulic cylinder 13 drives the upper die assembly 14 downward and cooperates with the lower die mechanism 20 to press the sheet, and then the hydraulic cylinder 13 drives the upper die assembly 14 to continue moving downward and punch and bend the sheet.

[0052] like Figures 2 to 3As shown, the upper mold assembly 14 includes a mounting base 141, a fixed column 142, a pressure strip 143, a bending block 144, a stamping member 145, a movable rod 146, a pressure block 147, and a slide 148. The bottom end of the fixed column 142 is mounted on the top of the mounting base 141, and the top end of the fixed column 142 is fixed to the movable end of the hydraulic cylinder 13. There are two pressure strips 143, both mounted on the side of the mounting base 141 facing the conveying mechanism 30. There are two bending blocks 144, one mounted on each side of the bottom of the mounting base 141, and the bottoms of the two bending blocks 144 on opposite sides have inclined surfaces.

[0053] A stamping part 145 is mounted in the middle of the lower surface of the mounting base 141. A pressure block 147 is located outside the stamping part 145 and has a hole formed in the pressure block 147 for the stamping part 145 to pass through. Two movable rods 146 are mounted on either side of the top of the pressure block 147. These movable rods 146 are T-shaped and have two slide slots 148, one on each side of the interior of the mounting base 141. The top end of the movable rod 146 slides into the inside of the slide slots 148.

[0054] When punching a hole in a sheet, hydraulic cylinder 13 drives mounting seat 141 downward via fixed column 142. Simultaneously, mounting seat 141 drives pressing block 147 downward via movable rod 146 and into contact with the sheet. As mounting seat 141 continues to move downward, pressing block 147 gradually presses the sheet, movable rod 146 gradually enters chute 148, and punching member 145 passes through pressing block 147 to punch a hole in the sheet. Then, mounting seat 141 continues to move downward and drives bending block 144 to bend the sheet.

[0055] like Figures 1 to 4 As shown, the buffer assembly 15 includes a slide bar 151, a first connecting plate 152, a first spring 153, and a second connecting plate 154. The slide bar 151 is mounted on top of the base plate 70, and both the first connecting plate 152 and the second connecting plate 154 are slidably connected to the outside of the slide bar 151. The first connecting plate 152 is mounted on one side of the mounting base 141, and the second connecting plate 154 is mounted on one side of the pressure block 147. The first spring 153 is sleeved on the outside of the slide bar 151 and mounted between the first connecting plate 152 and the second connecting plate 154.

[0056] During the downward movement of the mounting seat 141, the mounting seat 141 drives the connecting plate 152 to move downward synchronously, and at the same time, the pressure block 147 drives the connecting plate 2 154 to move downward synchronously. When the pressure block 147 contacts the plate, as the mounting seat 141 continues to move downward, the spring 153 is gradually compressed, so that the pressure block 147 presses the plate.

[0057] like Figure 1 、 Figure 3 and Figure 5As shown, the lower die assembly 20 includes a lower die block 21, a punching hole 22, and a waste hole 23. The lower die block 21 is mounted on top of the base plate 70 and directly below the pressure block 147. Both sides of the lower die block 21 are provided with inclined surfaces that mate with the bending blocks 144 to bend the sheet material. The punching hole 22 is located at the top of the lower die block 21, and the waste hole 23 is located inside the lower die block 21 and communicates with the punching hole 22. A discharge channel is provided on one side of the lower die block 21, communicating with the waste hole 23, to discharge the punched waste material from the lower die block 21.

[0058] After the punching part 145 passes through the plate, the punching part 145 drives the waste generated by the punching into the punching hole 22 . At this time, the waste falls into the waste hole 23 along the punching hole 22 and is discharged from the lower module 21 .

[0059] like Figure 1 and Figures 6 to 8 As shown, the conveying mechanism 30 includes a support platform 31, a conveyor 32, a stop plate 33, and a stop slot 34. The support platform 31 is mounted on top of the base plate 70, and the conveyor 32 is mounted on top of the support platform 31. The conveyor 32 is a roller conveyor device, which is conventional and its specific structure is not described here. The conveyor 32 has an inlet and a discharge port. The stop plate 33 is mounted on the top side of the discharge port of the conveyor 32, and the stop slot 34 is provided on the bottom side of the stop plate 33.

[0060] When the plate is conveyed to the lower module 21, the plate is driven by the conveyor 32 to move to the top of the lower module 21. During the movement of the end of the plate to the lower module 21, the lower protective mechanism 50 presses the end of the protective film into the limiting groove 34 of the limiting plate 33 to wrap the end of the plate. As the plate continues to move, the plate drives the protective film to gradually move, so that the protective film in the lower protective mechanism 50 is located at the top and bottom of the plate, avoiding scratches when the plate slides on the lower module 21. After the plate moves to the lower module 21, the lower protective mechanism 50 releases the limit on the end of the protective film and rewinds the protective film. At this time, the end of the protective film gradually moves to the bottom of the plate and returns to the lower protective mechanism 50 from the bottom of the plate.

[0061] like Figure 1 and Figure 6 As shown, the upper protective mechanism 40 includes a film unwinding assembly 41, a support assembly 42, and a reel assembly 43. The film unwinding assembly 41 is mounted on the support platform 31, and the protective film is wound around it. The protective film on the film unwinding assembly 41 is made of PE. The support assembly 42 is mounted on the conveyor 32 and located to one side of the film unwinding assembly 41. The reel assembly 43 is mounted on the top side of the base plate 70.

[0062] The end of the protective film on the film-releasing assembly 41 passes around the supporting assembly 42 and falls to the top of the plate, and is then wound onto the winding assembly 43 along the moving direction of the plate.

[0063] like Figures 6 and 7 As shown, the film unwinding assembly 41 includes a support base 411 and a film unwinding roller 412. There are two support bases 411, which are respectively mounted on both sides of the top of the support platform 31. The film unwinding roller 412 is rotatably connected between the two support bases 411 and is located above the conveyor 32. The protective film is wound on the film unwinding roller 412.

[0064] like Figures 6 and 7 and Figure 9 As shown, the support assembly 42 includes an elastic member, a sliding member, and a movable roller 423. There are two elastic members and two sliding members, which are respectively installed on both sides of the conveyor 32 and are arranged near the discharge port of the conveyor 32. The sliding member is slidably connected to the top of the elastic member.

[0065] The sliding member includes a slide plate 422 and a pressure rod 424. The slide plate 422 is T-shaped. The bottom of the slide plate 422 is slidably connected to the inside of the elastic member. The movable roller 423 is rotatably connected between the two slide plates 422. The pressure rod 424 is installed on one side of the slide plate 422 and is located below the pressure bar 143.

[0066] The elastic member includes a mounting plate 421, a support block 425, and a second spring 426. The support block 425 is mounted on one side of the conveyor 32, the mounting plate 421 is mounted on top of the support block 425, and the second spring 426 is mounted between the inner wall of the mounting plate 421 and the bottom of the slide 422 to drive the movable roller 423 to reset.

[0067] The end of the protective film on the film-releasing roller 412 passes over the movable roller 423 and falls to the top of the plate, and is then wound onto the winding assembly 43 along the moving direction of the plate. When the pressure block 147 contacts the plate, the pressure strip 143 on the mounting seat 141 contacts the pressure rod 424. As the mounting seat 141 continues to move downward, the mounting seat 141 drives the pressure rod 424 downward through the pressure strip 143. At this time, the pressure rod 424 drives the movable roller 423 downward through the slide 422, lowering the height of the movable roller 423. This prevents the bending block 144 from pulling the film-releasing roller 412 to unwind when bending the plate, preventing the protective film from extending too long and affecting the subsequent transportation of the plate. At the same time, the protective film located on the top of the plate can prevent the bending block 144 from directly contacting the plate and causing the plate to be scratched, thereby improving the processing quality of the plate.

[0068] like Figure 6 and Figure 10As shown, the winding assembly 43 includes a support plate 431, a winding roller 432, a motor 1 433, and a support roller 434. There are two support plates 431, both mounted on top of the base plate 70. The winding roller 432 and the support roller 434 are rotatably connected between the two support plates 431, with the winding roller 432 positioned below the support roller 434. Motor 1 433 is mounted on one side of one of the support plates 431, with its drive shaft connected to one end of the winding roller 432.

[0069] The end of the protective film on the film-laying roller 412 passes over the movable roller 423 and falls to the top of the plate. It is then wound around the support roller 434 along the direction of movement of the plate and wound onto the winding roller 432. After the plate is bent, the motor 433 drives the winding roller 432 to rotate, winding the protective film on the top of the plate onto the winding roller 432 to prevent the protective film from being damaged by the bending block 144 from continuing to be used in its original position.

[0070] like Figure 6 and Figure 11 As shown, the lower protective mechanism 50 includes a retractable assembly 51, a film pressing assembly 52, a film winding assembly 53 and a drive assembly 54. The retractable assembly 51 is arranged at the bottom of one side of the support platform 31, and the protective film is wound on the retractable assembly 51. The protective film on the retractable assembly 51 is made of PVE material, and the width of the protective film is greater than the width of the plate. The film pressing assembly 52 is arranged at the bottom of the support block 425. There are two film winding assemblies 53, and the two film winding assemblies 53 are respectively located on both sides of the conveyor 32 and installed on the support platform 31. The drive assembly 54 is installed on the top of the base plate 70 and close to one side of the support platform 31. The drive assembly 54 is connected to the two film winding assemblies 53 in a transmission manner to drive the film winding assemblies 53 to rotate.

[0071] When the driving assembly 54 drives the film winding assembly 53 to rotate, the film winding assembly 53 can drive the end of the protective film to press into the limiting groove 34 of the limiting plate 33, so that the protective film on the retractable assembly 51 wraps the end of the plate.

[0072] Continue to refer Figure 6 and Figure 11 As shown, the retracting assembly 51 includes a retracting roller 511 and a connecting seat 512. There are two connecting seats 512, both mounted on the bottom side of the support platform 31. The retracting roller 511 is rotatably connected between the two connecting seats 512. A spring (not shown) is installed between one of the connecting seats 512 and the retracting roller 511 to enable the retracting roller 511 to rewind the protective film.

[0073] like Figure 6 and Figures 11 to 12As shown, the film pressing assembly 52 includes a vertical plate 521, a pressure roller 522, and a rotating rod 523. There are two vertical plates 521, each mounted at the bottom of the two support blocks 425. The pressure roller 522 and the rotating rod 523 are both rotatably connected between the two vertical plates 521. A gap is provided between the pressure roller 522 and the rotating rod 523 for the protective film to pass through.

[0074] like Figure 6 and Figures 11 to 13 As shown, the film winding assembly 53 includes an inclined plate 531, a turntable 532, a film winding rod 533, a rotating rod 534 and a pulley 535. The inclined plate 531 is mounted on the top of one side of the support platform 31, and the turntable 532 is rotatably connected to one side of the inclined plate 531. The film winding rod 533 is mounted at the edge of one end of the turntable 532, and the film winding rod 533 is located on one side of the plate. A silicone sleeve is provided on the outside of the film winding rod 533 to increase the friction between the film winding rod 533 and the protective film. The protective film on the retracting roller 511 passes through the gap between the pressure roller 522 and the rotating rod 523 and falls to one side of the film winding rod 533. One end of the rotating rod 534 is mounted on the other end of the turntable 532, and the other end of the rotating rod 534 passes through the inclined plate 531 and extends to the outside of the inclined plate 531. The pulley 535 is mounted on the outside of the other end of the rotating rod 534.

[0075] As the turntable 532 rotates, it drives the end of the protective film, via the film winding rod 533, into the retaining groove 34 of the retaining plate 33, causing the protective film on the reel roller 511 to wrap around the end of the sheet. As the sheet moves, the protective film drives the reel roller 511 to rotate, causing it to continuously release the protective film. Simultaneously, the spring between the connecting seat 512 and the reel roller 511 contracts. When the film winding rod 533 returns to its original position, the spring between the connecting seat 512 and the reel roller 511 returns to its original position, driving the reel roller 511 to rotate in the opposite direction, rewinding the protective film.

[0076] like Figure 6 and Figure 11 As shown, the drive assembly 54 includes a rotating shaft 541, a vertical plate 542, a second pulley 543, and a second motor 544. There are two vertical plates 542, with the rotating shaft 541 rotatably connected between the two vertical plates 542. The vertical plates 542 are mounted on the top of the base plate 70, near the side of the support platform 31. There are two second pulleys 543, each mounted on the outer side of each end of the rotating shaft 541. The first pulley 535 and the second pulley 543 are connected via a belt drive. The second motor 544 is mounted on one side of one of the vertical plates 542, and the drive shaft of the second motor 544 is connected to one end of the rotating shaft 541.

[0077] Motor 2 544 drives pulley 2 543 to rotate through rotating shaft 541, and pulley 2 543 drives film winding rod 533 on turntable 532 to rotate through rotating rod 534 on pulley 1 535, so that film winding rod 533 drives the end of protective film to be pressed into the limiting groove 34 of limiting plate 33.

[0078] like Figures 6 to 8 and Figure 11 As shown, the cutting mechanism 60 includes a mounting frame 61, a second hydraulic cylinder 62, a slide 63, a fixed plate 64, a cutter 65, a pressure plate 67, and a limiter. The mounting frame 61 is U-shaped and is mounted on the top of the base plate 70 and close to the side of the vertical plate 542. The second hydraulic cylinder 62 is mounted on the inner bottom wall of the mounting frame 61. The bottom end of the slide 63 is mounted on the movable end of the second hydraulic cylinder 62. The top end of the slide 63 passes through the mounting frame 61 and extends to the outside of the mounting frame 61. The fixed plate 64 is mounted on the top of the slide 63, and the cutter 65 is mounted on the top of the fixed plate 64. The pressure plate 67 is located outside the cutter 65 and is set directly below the limiter 33. The pressure plate 67 is provided with a slot for the cutter 65 to pass through.

[0079] There are multiple limiters, each mounted on either side of the bottom of the pressure plate 67. These limiters include a limit rod 66 and a third spring 68. The top of the limit rod 66 is mounted on the bottom of the pressure plate 67, while the bottom of the limit rod 66 extends through the fixed plate 64 and outward. The third spring 68 fits over the outside of the limit rod 66 and is mounted between the fixed plate 64 and the pressure plate 67 to reset the pressure plate 67.

[0080] After the protective film on the retractable roller 511 is completely wound, hydraulic cylinder 2 62 drives the cutter 65 upward via the fixed plate 64 on the slide column 63. Simultaneously, the pressure plate 67 moves upward in tandem with the fixed plate 64. When the pressure plate 67 contacts the sheet, the sheet is positioned between the stop plate 33 and the pressure plate 67. As the fixed plate 64 continues to move upward, spring 3 68 compresses, pressing the sheet through the stop plate 33 and the pressure plate 67. The fixed plate 64 then drives the cutter 65 through the pressure plate 67 and cuts the sheet, facilitating subsequent bending operations.

[0081] Working Principle: When punching and bending a sheet, the sheet is moved onto the lower module 21 via the conveyor 32. As the sheet's end moves toward the lower module 21, the second motor 544 rotates the second pulley 543 via the rotating shaft 541. The second pulley 543, via the rotating rod 534 on the first pulley 535, rotates the film-winding rod 533 on the turntable 532. The film-winding rod 533 then presses the end of the protective film into the retaining groove 34 of the retaining plate 33, causing the protective film on the reel 511 to wrap around the sheet's end. As the sheet continues to move, the protective film gradually moves with it, positioning the protective film on the reel 511 at the top and bottom of the sheet, preventing scratches caused by the sheet sliding on the lower module 21. Once the sheet reaches the lower module 21, the second motor 544 reverses the rotating shaft 541, resetting the film-winding rod 533. This releases the retaining force on the end of the protective film, allowing the reel 511 to rewind the protective film. At this time, the end of the protective film gradually moves to the bottom of the plate and gradually separates from the plate. After the protective film is completely separated from the plate, it naturally droops and rests on one side of the film winding rod 533 for subsequent use.

[0082] At the same time, the end of the protective film on the film-releasing roller 412 passes around the movable roller 423 and falls to the top of the plate, and then is wound around the support roller 434 along the moving direction of the plate to the winding roller 432 to protect the top of the plate.

[0083] When bending a sheet, the mounting base 141 drives the pressure rod 424 downward via the pressure strip 143. The pressure rod 424 drives the movable roller 423 downward via the slide plate 422, lowering the movable roller 423. This prevents the bending block 144 from pulling the film roller 412 through the protective film when bending the sheet. Furthermore, the protective film on top of the sheet prevents the sheet from contacting the bending block 144, preventing direct contact with the sheet and potentially scratching it, thereby improving sheet processing quality.

[0084] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A thin-walled metal part punching and bending tool, comprising an upper die mechanism, a lower die mechanism, a conveying mechanism and a bottom plate, characterized in that: The conveying mechanism is equipped with an upper protection mechanism to prevent the top of the plate from being scratched; The upper protective mechanism includes a film-laying assembly, a supporting assembly and a winding assembly. The film-laying assembly is arranged on the conveying mechanism. A protective film is wound on the film-laying assembly. The supporting assembly is arranged on one side of the film-laying assembly. The winding assembly is arranged on the bottom plate. The end of the protective film on the film-laying assembly passes around the supporting assembly and falls to the top of the plate. Then, it is wound onto the winding assembly along the moving direction of the plate, so that the protective film is laid on the top of the plate. The support assembly includes a movable roller, two elastic members and two sliding members. The two elastic members are respectively installed on both sides of the conveying mechanism. The sliding members are elastically slidably connected to the elastic members in the vertical direction. The movable roller is rotatably connected between the two sliding members. The sliding members are provided with a pressure rod. The upper mold mechanism is provided with a pressure strip located above the pressure rod. The conveying mechanism includes a support platform, a conveyor, a limit plate and a limit slot, wherein the support platform is mounted on the bottom plate, the conveyor is mounted on the support platform, the limit plate is mounted on the top of one side of the conveyor, and the limit slot is opened at the bottom of the limit plate; A lower protective mechanism is provided on one side of the conveying mechanism, and a protective film is provided on the lower protective mechanism. The lower protective mechanism can press the end of the protective film into the limiting groove so that the protective film is laid on the bottom of the plate to protect the bottom of the plate. The lower protective mechanism includes a retracting assembly, a film pressing assembly and two film winding assemblies. The film winding assembly includes an inclined plate, a turntable and a film winding rod. The inclined plate is installed on a support table, the turntable is rotatably connected to one side of the inclined plate, and the film winding rod is installed at the edge of one end of the turntable.

2. The thin-walled metal part punching and bending tool according to claim 1, characterized in that: The film placing assembly includes a film placing roller and two support seats. The two support seats are both arranged on the conveying mechanism. The film placing roller is rotatably connected between the two support seats, and the protective film is wound on the film placing roller.

3. The thin-walled metal part punching and bending tool according to claim 1, characterized in that: The winding assembly includes a winding roller, a support roller and two support plates. The two support plates are installed on the base plate. The winding roller and the support roller are rotatably connected between the two support plates. The winding roller is located below the support roller, and the end of the protective film is arranged on the winding roller.

4. The thin-walled metal part punching and bending tool according to claim 1, characterized in that: The retractable assembly is arranged on the support platform, the protective film is wound on the retractable assembly, the film pressing assembly is arranged on the elastic member, and the two film winding assemblies are respectively located on both sides of the conveyor and installed on the support platform.

5. The thin-walled metal part punching and bending tool according to claim 4, characterized in that: The retractable assembly includes a retractable roller and two connecting seats. The two connecting seats are both installed on the support platform. The retractable roller is rotatably connected between the two connecting seats. A spring is provided between one of the connecting seats and the retractable roller.

6. The thin-walled metal part punching and bending tool according to claim 4, characterized in that: The film pressing assembly includes a pressing roller, a rotating rod and two vertical plates. The two vertical plates are respectively installed on two elastic parts. The pressing roller and the rotating rod are both rotatably connected between the two vertical plates. A gap is provided between the pressing roller and the rotating rod for the protective film to pass through.

7. The thin-walled metal part punching and bending tool according to claim 4, characterized in that: A cutting mechanism is provided between the lower die mechanism and the supporting platform, and the cutting mechanism is located below the limiting plate to cut the plate.

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