Bending device for automobile door hinge production

Abstract

The utility model relates to the technical field of hinge bending, and discloses a bending device for automobile door hinge production, which comprises a dust removal device, a swing dust collector, a workbench, a bending device, a hemming device, a support column, a fixing plate, a bending device hydraulic machine and a hemming device hydraulic machine, according to the bending machine, the hydraulic machine is used for driving, automatic bending operation is achieved, manual operation is reduced, the production efficiency is improved, the limiting block and the arc-shaped fixing base are arranged, it is ensured that a workpiece keeps the correct position and shape in the bending process, the bending precision is improved, manual intervention is reduced through automatic edge curling operation, and the production efficiency is improved; through the combination of the dust collection filter screen, the dust collection box and the swing dust collector, dust and chippings on the surface of the workbench are sucked into the dust collection box, the working environment is kept clean, the dust and the chippings on the surface of the workbench are effectively removed and prevented from affecting the quality of workpieces, the time of production interruption caused by cleaning of the working environment is shortened, and the production efficiency is improved. Dust and chippings are prevented from entering the equipment, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hinge bending, in particular to a bending device for producing automobile door hinges. Background Technique

[0002] With the rapid development of the automobile industry, the demand for automobile door hinges is increasing day by day. In order to improve production efficiency and product quality, automobile manufacturers are constantly exploring more efficient and precise bending devices. Traditional methods for bending door hinges often rely on manual operation or simple mechanical devices, which have problems such as low production efficiency, low precision, and high labor intensity. Therefore, it is particularly important to develop a bending device for producing automobile door hinges with high automation and high precision; during the bending process of existing devices, a large amount of metal chips and dust are often generated. If these impurities are not cleaned in time, they will not only affect the bending quality of workpieces, but also cause wear and damage to the equipment. However, most existing devices use manual cleaning or simple dust suction equipment for cleaning, with low cleaning efficiency and difficult to meet the needs of large-scale production. For this reason, we propose a bending device for producing automobile door hinges. Content of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides a bending device for producing automobile door hinges, which solves the above problems.

[0004] To achieve the above object, the utility model provides the following technical solution: A bending device for producing automobile door hinges, including a dust removal device, a swing vacuum cleaner, a workbench, a bending device, a hemming device, support columns, a fixing plate, a bending device hydraulic press, and a hemming device hydraulic press. The top of the dust removal device is fixedly installed with a workbench. The top of the workbench is provided with a bending device and a hemming device. Support columns are fixedly installed at the four top corners of the top of the workbench. The other ends of multiple groups of support columns are fixedly installed together with the bottom end of the fixing plate. The top of the fixing plate is fixedly installed with a bending device hydraulic press corresponding to one side of the bending device. The hydraulic rod of the bending device hydraulic press penetrates and extends out of one side of the fixing plate and is connected to the top of the bending device. The top of the fixing plate is fixedly installed with a hemming device hydraulic press corresponding to one side of the hemming device. The hydraulic rod of the hemming device hydraulic press penetrates and extends out of one side of the fixing plate and is connected to the top of the hemming device. A swing vacuum cleaner is arranged on one side of the workbench.

[0005] Preferably, the dust removal device includes a dust suction filter screen and a dust collection box. The dust collection box is fixedly installed at the bottom of the workbench. Both ends of the dust collection box are provided with dust suction filter screens. Multiple groups of dust suction filter screens all penetrate and extend to the surface of the workbench. The bottom ends of multiple groups of dust suction filter screens are connected to the inside of the dust collection box through pipelines.

[0006] Preferably, the swing vacuum cleaner includes a suction pipe, a fixed pipe, a hose, a filter, a turbo fan, and a swing device. A turbo fan is fixedly installed on one side of the dust collection box. One end of the turbo fan communicates with the inside of the dust collection box, and the other end is fixedly installed with a filter. The top end of the side of the filter away from the turbo fan is fixedly installed with a hose. The hose extends upward and is connected to the fixed pipe. One end of the fixed pipe extends toward the workbench to form a suction pipe, and a swing device is arranged at the bottom end of the fixed pipe.

[0007] Preferably, the swing device includes a swing device support plate, a fixed block, a swing motor, a swing rod, a slider, a chute, and a rotating rod. The bottom end of the fixed pipe is rotatably installed with a rotating rod. The bottom end of the rotating rod is fixedly installed with a swing device support plate. One side of the swing device support plate is fixedly installed on the top end of the workbench. The top end of the swing device support plate away from the rotating rod is fixedly installed with a fixed block. The top end of the swing device support plate near the fixed block is fixedly installed with a swing motor. A steering shaft is arranged at the top end of the fixed block and is rotatably installed with the chute. The output shaft of the swing motor is fixedly installed with a swing rod. The top end of the swing rod is rotatably installed with a slider. The slider is slidably clamped inside the chute.

[0008] Preferably, the bending device includes a bending device base, a return spring, an arc-shaped fixed seat, a limiting block, a bending device column, a bending device upper base, a tapered block, and a bending device fixed shaft. A groove is formed in the middle section of the bending device base, and two groups of return springs are fixedly installed in the groove. The top ends of the two groups of return springs are fixedly installed with an arc-shaped fixed seat. Limiting blocks are fixedly installed on both sides of the top end of the bending device base near the middle groove. Bending device columns are fixedly installed on both sides of the diagonal of the top end of the bending device base. The top end of the bending device column is provided with a bending device upper base. A bending device fixed shaft is fixedly installed at the top end of the bending device upper base. A tapered block is fixedly installed on the bottom end of the bending device upper base corresponding to one side of the arc-shaped fixed seat. The protrusion of the tapered block corresponds to the middle groove of the bending device base.

[0009] Preferably, the curling device includes a curling device base, curling device columns, curling device limit blocks, extrusion arc blocks, triangular cones, curling device return springs, extrusion fixed bases, curling device upper bases, and curling device fixed shafts. One side of the top of the curling device base is fixedly installed with a curling device limit block. A groove is provided on the side of the curling device base away from the curling device limit block, and an extrusion arc block is fixedly installed in the groove. An arc-shaped opening is provided at one end of the extrusion arc block facing the curling device limit block. Curling device columns are fixedly installed at the vertices around the top of the curling device base. The tops of multiple groups of curling device columns are provided with curling device upper bases. A curling device return spring is fixedly installed at the bottom of the curling device upper base close to the curling device limit block. The bottom end of the curling device return spring is fixedly installed with an extrusion fixed base. A triangular cone is fixedly installed on the side of the bottom end of the curling device upper base away from the extrusion fixed base. The triangular cone corresponds to the extrusion arc block. A curling device fixed shaft is fixedly installed at the top of the curling device upper base.

[0010] Preferably, openings are provided at the top of the bending device upper base corresponding to two groups of bending device columns. The two groups of bending device columns are all sleeved in the openings of the bending device upper base. Openings are provided at the top of the curling device upper base corresponding to multiple groups of curling device columns. The multiple groups of curling device columns are all sleeved in the openings of the curling device upper base. The hydraulic rods of the bending device hydraulic press and the curling device hydraulic press are respectively fixedly connected to the bending device fixed shaft at the top of the bending device upper base and the curling device fixed shaft at the top of the curling device upper base.

[0011] Compared with the prior art, the present utility model has the following beneficial effects:

[0012] 1. The bending device for producing automobile door hinges is driven by a hydraulic press to achieve automated bending operations, reducing manual operations and improving production efficiency. By setting limit blocks and arc-shaped fixed seats, the workpiece is ensured to maintain the correct position and shape during the bending process, improving the bending accuracy. The automated curling operation reduces manual intervention and improves production efficiency.

[0013] 2. The bending device for producing automobile door hinges, through the combination of a dust suction filter screen, a dust collection box, and a swinging dust collector, sucks dust and debris on the surface of the workbench into the dust collection box, keeping the working environment clean, effectively removing dust and debris on the surface of the workbench, preventing them from affecting the quality of the workpiece, reducing the time for interrupting production due to cleaning the working environment, improving production efficiency, preventing dust and debris from entering the interior of the equipment, and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0015] Figure 2 This is a schematic side view structure diagram of the present utility model;

[0016] Figure 3 This is a schematic structure diagram of the dust removal device and the swing vacuum cleaner of the present utility model;

[0017] Figure 4 This is a schematic structure diagram of the bending device of the present utility model;

[0018] Figure 5 This is a schematic structure diagram of the curling device of the present utility model.

[0019] In the figure: 1. Dust removal device; 2. Swing vacuum cleaner; 3. Workbench; 4. Bending device; 5. Curling device; 6. Support column; 7. Fixed plate; 8. Hydraulic press of the bending device; 9. Hydraulic press of the curling device; 10. Dust suction filter screen; 11. Dust collection box; 12. Dust suction pipe; 13. Fixed pipe; 14. Hose; 15. Filter; 16. Turbine fan; 17. Swing device; 18. Swing device support plate; 19. Fixed block; 20. Swing motor; 21. Swing rod; 22. Slide block; 23. Slide groove; 24. Rotating rod; 25. Base of the bending device; 26. Return spring; 27. Arc-shaped fixed seat; 28. Limit block; 29. Column of the bending device; 30. Upper base of the bending device; 31. Conical block; 32. Fixed shaft of the bending device; 33. Base of the curling device; 34. Column of the curling device; 35. Limit block of the curling device; 36. Extrusion arc-shaped block; 37. Triangular pyramid; 38. Return spring of the curling device; 39. Extrusion fixed base; 40. Upper base of the curling device; 41. Fixed shaft of the curling device. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0021] Please refer to Figures 1-5, A bending device for the production of automobile door hinges, comprising a dust removal device 1, a swing vacuum cleaner 2, a workbench 3, a bending device 4, a hemming device 5, support columns 6, a fixing plate 7, a bending device hydraulic press 8 and a hemming device hydraulic press 9. The top of the dust removal device 1 is fixedly installed with a workbench 3. The top of the workbench 3 is provided with a bending device 4 and a hemming device 5. At the four corners of the top of the workbench 3, support columns 6 are fixedly installed. The other ends of multiple groups of support columns 6 are fixedly installed together with the bottom end of the fixing plate 7. On the top of the fixing plate 7, a bending device hydraulic press 8 is fixedly installed on one side corresponding to the bending device 4. The hydraulic rod of the bending device hydraulic press 8 penetrates and extends out of one side of the fixing plate 7 and is connected to the top of the bending device 4. On the top of the fixing plate 7, a hemming device hydraulic press 9 is fixedly installed on one side corresponding to the hemming device 5. The hydraulic rod of the hemming device hydraulic press 9 penetrates and extends out of one side of the fixing plate 7 and is connected to the top of the hemming device 5. A swing vacuum cleaner 2 is arranged on one side of the workbench 3.

[0022] Furthermore, the dust removal device 1 includes a dust suction filter screen 10 and a dust collection box 11. The bottom end of the workbench 3 is fixedly installed with a dust collection box 11. Dust suction filter screens 10 are arranged at both ends of the dust collection box 11. Multiple groups of dust suction filter screens 10 all penetrate and extend to the surface of the workbench 3. The bottom ends of multiple groups of dust suction filter screens 10 are connected to the inside of the dust collection box 11 through pipelines.

[0023] Furthermore, the swing vacuum cleaner 2 includes a dust suction pipe 12, a fixed pipe 13, a flexible pipe 14, a filter 15, a turbo fan 16 and a swing device 17. A turbo fan 16 is fixedly installed on one side of the dust collection box 11. One end of the turbo fan 16 is communicated with the inside of the dust collection box 11, and the other end is fixedly installed with a filter 15. The top of the side of the filter 15 away from the turbo fan 16 is fixedly installed with a flexible pipe 14. The flexible pipe 14 extends upward and is connected to the fixed pipe 13. One end of the fixed pipe 13 extends towards the workbench 3 to form a dust suction pipe 12. A swing device 17 is arranged at the bottom end of the fixed pipe 13.

[0024] Further, the swing device 17 includes a swing device support plate 18, a fixed block 19, a swing motor 20, a swing rod 21, a slider 22, a chute 23, and a rotating rod 24. The bottom end of the fixed tube 13 is rotatably installed with the rotating rod 24. The bottom end of the rotating rod 24 is fixedly installed with the swing device support plate 18. One side of the swing device support plate 18 is fixedly installed at the top end of the workbench 3. One side of the top end of the swing device support plate 18 away from the rotating rod 24 is fixedly installed with the fixed block 19. One side of the top end of the swing device support plate 18 close to the fixed block 19 is fixedly installed with the swing motor 20. The top end of the fixed block 19 is provided with a steering shaft and is rotatably installed with the chute 23. The output shaft of the swing motor 20 is fixedly installed with the swing rod 21. The top end of the swing rod 21 is rotatably installed with the slider 22. The slider 22 is slidably clamped inside the chute 23; through the combination of the dust suction filter screen 10, the dust collection box 11, and the swing vacuum cleaner 2, the dust and debris on the surface of the workbench are sucked into the dust collection box, keeping the working environment clean, effectively removing the dust and debris on the surface of the workbench, preventing them from affecting the quality of the workpiece, reducing the time for interrupting production due to cleaning the working environment, improving production efficiency, preventing dust and debris from entering the interior of the equipment, and extending the service life of the equipment.

[0025] Further, the bending device 4 includes a bending device base 25, a return spring 26, an arc-shaped fixed seat 27, a limit block 28, a bending device column 29, a bending device upper base 30, a tapered block 31, and a bending device fixed shaft 32. A groove is opened in the middle section of the bending device base 25, and two groups of return springs 26 are fixedly installed in the groove. The top ends of the two groups of return springs 26 are fixedly installed with the arc-shaped fixed seat 27. Limit blocks 28 are fixedly installed on both sides of the top end of the bending device base 25 close to the middle groove. Bending device columns 29 are fixedly installed on both diagonal sides of the top end of the bending device base 25. The top end of the bending device column 29 is provided with a bending device upper base 30. The top end of the bending device upper base 30 is fixedly installed with the bending device fixed shaft 32. One side of the bottom end of the bending device upper base 30 corresponding to the arc-shaped fixed seat 27 is fixedly installed with the tapered block 31. The protrusion of the tapered block 31 corresponds to the middle groove of the bending device base 25.

[0026] Furthermore, the curling device 5 includes a curling device base 33, a curling device column 34, a curling device limit block 35, an extrusion arc block 36, a triangular cone 37, a curling device return spring 38, an extrusion fixed base 39, a curling device upper base 40 and a curling device fixed shaft 41. The curling device limit block 35 is fixedly installed on one side of the top of the curling device base 33, and the curling device base 33 is provided with a groove on the side away from the curling device limit block 35, and the extrusion arc block 36 is fixedly installed in the groove, and the extrusion arc block 36 is provided with an arc opening at one end facing the curling device limit block 35. The vertices around the top of the seat 33 are fixedly installed with curling device columns 34, and the tops of multiple groups of curling device columns 34 are provided with curling device upper bases 40. The curling device upper base 40 is fixedly installed with a curling device return spring 38 near the bottom end of the curling device limit block 35, and the bottom end of the curling device return spring 38 is fixedly installed with an extrusion fixed base 39. The bottom end of the curling device upper base 40 is fixedly installed with a triangular cone 37 on the side away from the extrusion fixed base 39. The triangular cone 37 corresponds to the extrusion arc block 36, and the top of the curling device upper base 40 is fixedly installed with a curling device fixed shaft 41.

[0027] Furthermore, openings are provided at the top of the bending device upper base 30 corresponding to the two groups of bending device columns 29, and the two groups of bending device columns 29 are all sleeved in the openings of the bending device upper base 30, and openings are provided at the top of the curling device upper base 40 corresponding to the multiple groups of curling device columns 34, and the multiple groups of curling device columns 34 are all sleeved in the openings of the curling device upper base 40. The hydraulic rods of the bending device hydraulic press 8 and the curling device hydraulic press 9 are respectively fixedly connected to the bending device fixed shaft 32 at the top of the bending device upper base 30 and the curling device fixed shaft 41 at the top of the curling device upper base 40; driven by the hydraulic press, automated bending operation is realized, manual operation is reduced, and production efficiency is improved. By setting limit blocks and arc-shaped fixed seats, it is ensured that the workpiece maintains the correct position and shape during the bending process, and the bending accuracy is improved. The automated curling operation reduces manual intervention and improves production efficiency.

[0028] Working principle: The bending device 4 is in an inactive state. The upper base 30 of the bending device is suspended above the base 25 of the bending device through the column 29 of the bending device. The tapered block 31 maintains a certain distance from the arc-shaped fixed seat 27. The curling device 5 is also in an inactive state. The upper base 40 of the curling device is suspended above the base 33 of the curling device through the column 34 of the curling device. The triangular cone 37 does not contact the extrusion arc-shaped block 36. The dust removal device 1 and the swing vacuum cleaner 2 are both in a standby state, ready to clean the dust in the working environment at any time. Start the hydraulic press 8 of the bending device. The hydraulic rod of the hydraulic press pushes downward, driving the upper base 30 of the bending device and the attached tapered block 31 to move downward. As the tapered block 31 gradually approaches and contacts the workpiece, the workpiece is subjected to a downward pressure and begins to deform. At the same time, the arc-shaped fixed seat 27 and the limit block 28 ensure that the workpiece maintains the correct position and shape during the bending process. When the preset bending angle is reached, the hydraulic press stops working, the upper base 30 of the bending device stops descending, and the workpiece remains in the bent state. After the bending is completed, the hydraulic press 8 of the bending device works in reverse, and the hydraulic rod drives the upper base 30 of the bending device and its accessories to rise back to the initial position. The return spring 26 assists the tapered block 31 to quickly reset, preparing for the next bending operation. If the workpiece still needs to be curled, start the hydraulic press 9 of the curling device. The hydraulic rod of the hydraulic press pushes downward, driving the upper base 40 of the curling device and the attached triangular cone 37 to move downward. The triangular cone 37 gradually approaches and contacts the edge of the workpiece, and the curling effect is achieved through the extrusion arc-shaped block 36. When the preset curling effect is reached, the hydraulic press stops working, and the upper base 40 of the curling device stops descending. After the curling is completed, the hydraulic press 9 of the curling device works in reverse, and the hydraulic rod drives the upper base 40 of the curling device and its accessories to rise back to the initial position. The return spring 38 of the curling device assists the extrusion fixed base 39 to quickly reset, preparing for the next curling operation. Start the swing vacuum cleaner 2, and suck the dust and debris on the workbench 3 through the suction pipe 12. The suction filter screen 10 filters the dust in the air and discharges the clean air, while the dust falls into the dust collection box 11. Regularly clean the dust collection box 11 and the suction filter screen 10 to keep the vacuum cleaner clean and efficient. Through the above steps, the bending and curling operations of the automobile door hinge are completed, and the working environment is kept clean at the same time.

[0029] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bending device for the production of automobile door hinges, comprising a dust removal device (1), a swing vacuum cleaner (2), a workbench (3), a bending device (4), a hemming device (5), a support column (6), a fixing plate (7), a bending device hydraulic press (8) and a hemming device hydraulic press (9), characterized in that: A workbench (3) is fixedly installed at the top end of the dust removal device (1). A bending device (4) and a curling device (5) are arranged at the top end of the workbench (3). Support columns (6) are fixedly installed at the four top corners of the top end of the workbench (3). The other ends of multiple groups of the support columns (6) are fixedly installed together with the bottom end of a fixing plate (7). A bending device hydraulic press (8) is fixedly installed at one side of the fixing plate (7) corresponding to the bending device (4). The hydraulic rod of the bending device hydraulic press (8) penetrates and extends out of one side of the fixing plate (7) and is connected with the top end of the bending device (4). A curling device hydraulic press (9) is fixedly installed at one side of the fixing plate (7) corresponding to the curling device (5). The hydraulic rod of the curling device hydraulic press (9) penetrates and extends out of one side of the fixing plate (7) and is connected with the top end of the curling device (5). A swing vacuum cleaner (2) is arranged at one side of the workbench (3).

2. The bending device for manufacturing an automobile door hinge according to claim 1, characterized in that: The dust removal device (1) includes a dust suction filter screen (10) and a dust collection box (11). The dust collection box (11) is fixedly installed at the bottom end of the workbench (3). Dust suction filter screens (10) are arranged at both ends of the dust collection box (11). Multiple groups of the dust suction filter screens (10) all penetrate and extend to the surface of the workbench (3). The bottom ends of multiple groups of the dust suction filter screens (10) are connected with the inside of the dust collection box (11) through pipelines.

3. The bending device for producing automobile door hinges according to claim 2, characterized in that: The swing vacuum cleaner (2) includes a dust suction pipe (12), a fixed pipe (13), a flexible pipe (14), a filter (15), a turbine fan (16) and a swing device (17). A turbine fan (16) is fixedly installed at one side of the dust collection box (11). One end of the turbine fan (16) is communicated with the inside of the dust collection box (11), and the other end is fixedly installed with a filter (15). A flexible pipe (14) is fixedly installed at the top end of the side of the filter (15) away from the turbine fan (16). The flexible pipe (14) extends upward and is connected with the fixed pipe (13). One end of the fixed pipe (13) extends towards the workbench (3) to form a dust suction pipe (12). A swing device (17) is arranged at the bottom end of the fixed pipe (13).

4. A bending device for the production of automobile door hinges according to claim 3, characterized in that: The swing device (17) includes a swing device support plate (18), a fixed block (19), a swing motor (20), a swing rod (21), a slider (22), a chute (23) and a rotating rod (24). The bottom end of the fixed tube (13) is rotatably installed with a rotating rod (24). The bottom end of the rotating rod (24) is fixedly installed with a swing device support plate (18). One side of the swing device support plate (18) is fixedly installed at the top end of the workbench (3). One side of the top end of the swing device support plate (18) far from the rotating rod (24) is fixedly installed with a fixed block (19). One side of the top end of the swing device support plate (18) close to the fixed block (19) is fixedly installed with a swing motor (20). A steering shaft is arranged at the top end of the fixed block (19) and is rotatably installed with the chute (23). The output shaft of the swing motor (20) is fixedly installed with a swing rod (21). The top end of the swing rod (21) is rotatably installed with a slider (22). The slider (22) is slidably clamped inside the chute (23).

5. The bending device for producing an automobile door hinge according to claim 1, characterized in that: The bending device (4) includes a bending device base (25), a return spring (26), an arc-shaped fixed seat (27), a limit block (28), a bending device column (29), a bending device upper base (30), a tapered block (31) and a bending device fixed shaft (32). A groove is formed in the middle section of the bending device base (25), and two groups of return springs (26) are fixedly installed in the groove. The top ends of the two groups of return springs (26) are fixedly installed with an arc-shaped fixed seat (27). Limit blocks (28) are fixedly installed on both sides of the top end of the bending device base (25) close to the middle groove. Bending device columns (29) are fixedly installed on both diagonal sides of the top end of the bending device base (25). The top end of the bending device column (29) is provided with a bending device upper base (30). A bending device fixed shaft (32) is fixedly installed at the top end of the bending device upper base (30). A tapered block (31) is fixedly installed at the bottom end of the bending device upper base (30) corresponding to one side of the arc-shaped fixed seat (27). The protrusion of the tapered block (31) corresponds to the middle groove of the bending device base (25).

6. The bending device for producing an automobile door hinge according to claim 1, characterized in that: The hemming device (5) comprises a hemming device base (33), a hemming device column (34), a hemming device limit block (35), an extrusion arc block (36), a triangular cone (37), a hemming device return spring (38), an extrusion fixed base (39), a hemming device upper base (40) and a hemming device fixed shaft (41), wherein a hemming device limit block (35) is fixedly installed on one side of the top of the hemming device base (33), a groove is provided on the side of the hemming device base (33) facing away from the hemming device limit block (35), and an extrusion arc block (36) is fixedly installed in the groove, and an arc opening is provided on one end of the extrusion arc block (36) facing the hemming device limit block (35), and the hemming device base ( 33) The vertices around the top are all fixedly installed with curling device columns (34), and the tops of multiple groups of curling device columns (34) are all provided with curling device upper bases (40), and the bottom end of the curling device upper base (40) close to the curling device limit block (35) is fixedly installed with a curling device return spring (38), and the bottom end of the curling device return spring (38) is fixedly installed with an extrusion fixed base (39), and the bottom end of the curling device upper base (40) is fixedly installed with a triangular cone (37) on the side away from the extrusion fixed base (39), and the triangular cone (37) corresponds to the extrusion arc block (36), and the top end of the curling device upper base (40) is fixedly installed with a curling device fixed shaft (41).

7. A bending device for the production of automobile door hinges according to claim 1, characterized in that: The top of the bending device upper base (30) is provided with openings corresponding to the two groups of bending device columns (29), and the two groups of bending device columns (29) are both sleeved in the openings of the bending device upper base (30). The top of the hemming device upper base (40) is provided with openings corresponding to the multiple groups of hemming device columns (34), and the multiple groups of hemming device columns (34) are both sleeved in the openings of the hemming device upper base (40). The hydraulic rods of the bending device hydraulic press (8) and the hemming device hydraulic press (9) are respectively fixedly connected to the bending device fixed shaft (32) at the top of the bending device upper base (30) and the hemming device fixed shaft (41) at the top of the hemming device upper base (40).

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