Automatic flanging device for sheet metal parts

Abstract

The utility model discloses a sheet metal part automatic flanging device relates to sheet metal part manufacturing technical field, including frame, the top fixed connection of frame has the flanging part, and the middle position of frame is fixedly connected with fixed frame. The utility model discloses through the support axle, air bag and arc plate extension pipe spare inside, after the inflation of injecting gas in air bag, can push the arc plate of outer wall and expand outward movement, until its close adhesion pipe spare inner wall, form the rigid support of support from inside, at this time, through the flanging of pipe end is carried out flanging operation, through the effective resistance of flanging radial force from inside support, the local rigidity of pipe spare is strengthened, avoid the problem of the out of round and the deflation of flanging, the combination of air bag and arc plate has certain flexibility, can adapt to the pipe spare of different diameter in certain range, and arc plate is as rigid force transmission component, avoids the friction of air bag directly with pipe spare inner wall, and the support force distribution is more even, and the inner wall of workpiece is protected from being damaged.

Description

Technical Field

[0001] This utility model relates to the field of sheet metal manufacturing technology, specifically to an automatic sheet metal flanging device. Background Technology

[0002] In the sheet metal manufacturing industry, end flanging of tubular or cylindrical sheet metal parts is a common processing step. Its purpose is to enhance end strength, eliminate sharp edges for safety, or provide a foundation for subsequent connection and assembly. Traditional flanging devices mostly use integral rigid molds to form the tube ends through stamping.

[0003] If the current automated flanging equipment does not achieve the required flanging angle after flanging automotive sheet metal parts, the equipment needs to repeat the operation to ensure the quality of the work, thus disrupting the rhythm of the entire production line.

[0004] Chinese patent literature discloses a sheet metal flanging device (publication number CN117920822A), comprising: a fixed base for mounting on an equipment operating table; a support mechanism fixedly mounted on the fixed base for placing the sheet metal part and providing a reaction force during the flanging process; and a flanging mechanism adjustablely mounted on the fixed base for applying force to the sheet metal part on the support mechanism. However, the following defects still exist in its implementation:

[0005] The device described in the aforementioned literature, while completing the first roll forming by moving the flanging mechanism from the initial position to the pre-rolling position and then shifting it towards the support mechanism, requires a return along the same path during the reset to the initial position to complete the second roll forming. This allows the flanging device to complete two roll forming steps in a single continuous motion, better flanging the sheet metal to the required angle. Because the flanging mechanism moves from the initial position to the pre-rolling position and then tilts towards the support mechanism before resetting, it performs two roll forming processes on the sheet metal on the support mechanism. This reduces rework caused by substandard flanging angles. When using several flanging devices in a production line, each flanging... The equipment operates in a uniform manner to improve the overall production line's operational rhythm, increase processing efficiency, and boost production capacity. However, the equipment described in the aforementioned literature still has drawbacks. For thin-walled pipes, the enormous radial force during the flanging process can easily cause the pipe body to become unstable, resulting in shrinkage or ellipticization and product scrap. Rigid molds have poor adaptability when dealing with pipes of different diameters or with slight manufacturing tolerances, requiring frequent mold changes, which seriously affects production efficiency and flexibility. After flanging, mechanical interference may occur between the workpiece and the mold, making demolding difficult. Forced ejection operations can easily damage the workpiece surface or the mold. Uneven force cannot be applied during flanging, causing the pipe to slide or deform locally, affecting the flanging accuracy. Utility Model Content

[0006] The purpose of this utility model is to provide an automatic flanging device for sheet metal parts, so as to solve the problem of deformation during the flanging of pipe parts mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] An automatic sheet metal flanging device includes a frame; a flanging part is fixedly connected to the top of the frame, a fixed frame is fixedly connected to the middle position of the frame, a support shaft is set at the middle position of the fixed frame, multiple airbags arranged in a circular array are fixedly connected to the outer wall of the support shaft, an arc plate is fixedly connected to the outer wall of each airbag, the support shaft is hollow, and an operating platform is fixedly connected to the inner side wall of the fixed frame.

[0009] In the above technical solution, the tubular sheet metal part is located above the operating platform. At this time, the support shaft, airbag, and arc plate extend into the inside of the tube. After the airbag is injected with gas and expands, it can push the arc plate on the outer wall to expand outward until it is tightly attached to the inner wall of the tube, forming a rigid support from the inside. The internal support effectively resists the radial force brought by the flange, enhances the local rigidity of the tube, and avoids the problems of out-of-roundness and shrinkage during flangeing.

[0010] A further improvement of the present invention is that: a piston cylinder is fixedly connected to the end of the support shaft away from the airbag, a piston plate is slidably connected to the inner wall of the piston cylinder, a piston rod is fixedly connected to one end of the piston plate, the end of the piston rod away from the piston plate is connected to an external electric push rod, and a one-way valve is provided on the surface of the piston plate.

[0011] In the above technical solution, an external electric push rod drives the piston rod and piston plate to move inside the piston cylinder. When the piston plate moves into the piston cylinder, the air inside the cylinder is squeezed into the hollow support shaft and enters the air bladder to inflate. When demolding is required, the electric push rod is pulled back, the piston plate is reset, and the medium pressure inside the air bladder causes the one-way valve to open, the medium to flow back, the air bladder to contract, and the pressure to be stable and controllable, further increasing the local rigidity of the tubular sheet metal part.

[0012] A further improvement of this utility model is that: hydraulic cylinders are fixedly connected to both sides of the fixed frame, and limit plates are fixedly connected to the output ends of the two hydraulic cylinders. A sliding groove is provided on the inner wall of the limit plate, and a slider is slidably connected to the inner wall of the sliding groove. Two clamping plates are rotatably connected to the inner side wall of the slider. A support rod is fixedly connected to one side of the slider, and one end of the support rod is connected to the output end of the external electric push rod. The support rod and the limit plate are slidably connected.

[0013] In the above technical solution, the hydraulic cylinder drives the limiting plate to move towards the middle. At this time, the clamping plates hug the outer wall of the pipe from both sides. The rubber pad increases the friction and protects the surface of the workpiece from damage. At the same time, the external electric push rod pushes the support rod and the slider to move in the slide groove, adjusting the position of the pipe in real time.

[0014] A further improvement of this utility model is that: the two clamping plates on the same side are symmetrically arranged, the clamping plates are arranged in an outwardly bent arc shape, and a rubber pad is provided on the inner wall of the clamping plates.

[0015] The above technical solution features an arc-shaped clamping plate that expands upon contact with the pipe surface, ensuring that the pipe does not rotate during the flanging process and guaranteeing forming accuracy.

[0016] A further improvement of the present invention is that: a fixed plate is fixedly connected to the inner wall of the operating platform, a plurality of support blocks are slidably connected to the inner wall of the fixed plate, a spring is sleeved on the outer wall of the support block, the top of the spring is fixedly connected to the bottom of the fixed plate, a disc is fixedly connected to the bottom of the support block, and a protrusion is slidably connected to the inner wall of the operating platform, with the protrusion and the disc slidably connected.

[0017] Using the above technical solution, the top of the protrusion is arc-shaped, which fits the shape and contour of the disc. After the protrusion is pushed, its top abuts against the disc, thereby causing the support block to extend out from the fixed plate and contact the pipe, thus pushing the pipe out. This eliminates the need for manual demolding by workers and reduces their workload.

[0018] A further improvement of this utility model is that: the top of the protrusion is provided with the same number of protrusions as the disk, the protrusions are arranged in a semi-circular shape, the disk and the support block are an integral structure, and the top of the support block is arranged in an arc shape.

[0019] In the above technical solution, after the protrusion is reset, the support block is reset under the action of the spring and becomes flush with the surface of the operating platform.

[0020] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0021] 1. This utility model provides an automatic sheet metal flanging device. A support shaft, an air bladder, and an arc-shaped plate extend into the pipe fitting. Gas is injected into the air bladder, causing it to expand and push the arc-shaped plate on the outer wall outwards until it tightly adheres to the inner wall of the pipe fitting, forming a rigid support from the inside. At this point, the flanging section performs the flanging operation on the pipe end. The internal support effectively resists the radial force brought by the flanging, enhancing the local rigidity of the pipe fitting and preventing problems such as out-of-roundness and shrinkage during flanging. Specifically, the combination of the air bladder and the arc-shaped plate has a certain degree of flexibility, enabling it to adapt to pipe fittings of different diameters within a certain range and compensate for the roundness error of the pipe fitting. The arc-shaped plate, as a rigid force transmission component, prevents the air bladder from directly rubbing against the inner wall of the pipe fitting, while also making the support force distribution more uniform and protecting the inner wall of the workpiece from damage.

[0022] 2. This utility model provides an automatic sheet metal flanging device. The limit plate is driven to move towards the center by a hydraulic cylinder. At this time, the clamping plates hug the outer wall of the tube from both sides. The rubber pad increases the friction and protects the surface of the workpiece from damage. At the same time, the external electric push rod pushes the support rod and the slider to move in the slide groove, adjusting the position of the tube in real time. The clamping plates are arc-shaped and will expand accordingly when they contact the surface of the tube, ensuring that the tube will not rotate during the flanging process and ensuring the forming accuracy.

[0023] 3. This utility model provides an automatic sheet metal flanging device. The top of the protrusion is arc-shaped and adapts to the shape and contour of the disc. After the protrusion is pushed, its top abuts against the disc, thereby causing the support block to extend from the fixed plate and contact the pipe, thus pushing the pipe out. There is no need for manual demolding by the operator, which reduces the burden on the operator. After the protrusion is reset, the support block is reset under the action of the spring and is flush with the surface of the operating platform. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of the fixed frame in this utility model;

[0027] Figure 3 This is a schematic diagram of the overall structure of the operating platform in this utility model;

[0028] Figure 4 This is a three-dimensional structural diagram of the cooperation between the protrusion and the disk in this utility model;

[0029] Figure 5 This is a three-dimensional structural diagram of the cooperation between the limiting plate and the clamping piece in this utility model;

[0030] Figure 6 This is a schematic diagram of the overall structure of the clamping piece in this utility model;

[0031] Figure 7 This is a three-dimensional structural diagram of the cooperation between the support shaft and the piston cylinder in this utility model;

[0032] Figure 8 This is a three-dimensional structural diagram of the cooperation between the support shaft and the arc plate in this utility model.

[0033] In the diagram: 1. Frame; 2. Fixed frame; 3. Flanged part; 4. Hydraulic cylinder; 5. Operating platform; 6. Limiting plate; 7. Slider; 8. Clamping piece; 9. Support shaft; 10. Protrusion; 11. Fixed plate; 12. Support block; 13. Disc; 14. Spring; 15. Slide groove; 16. Support rod; 17. Piston cylinder; 18. Piston plate; 19. Piston rod; 20. Arc plate; 21. Airbag. Detailed Implementation

[0034] The present invention will be further described in detail below with reference to the embodiments.

[0035] Example 1

[0036] like Figure 1 , Figure 7 and Figure 8 As shown, this utility model provides an automatic sheet metal flanging device, including a frame 1; a flanging part 3 is fixedly connected to the top of the frame 1, a fixed frame 2 is fixedly connected to the middle position of the frame 1, a support shaft 9 is provided at the middle position of the fixed frame 2, a plurality of airbags 21 arranged in a circular array are fixedly connected to the outer wall of the support shaft 9, an arc plate 20 is fixedly connected to the outer wall of each airbag 21, the support shaft 9 is hollow, and an operating platform 5 is fixedly connected to the inner side wall of the fixed frame 2.

[0037] In this embodiment, during operation, the tubular sheet metal part is located above the operating platform 5. At this time, the support shaft 9, airbag 21, and arc plate 20 extend into the inside of the tube. After the airbag 21 is injected with gas and expands, it can push the arc plate 20 on the outer wall to expand outward until it tightly fits the inner wall of the tube, forming a rigid support from the inside. At this time, the tube end is flanged by the flange part 3. The radial force brought by the flange is effectively resisted by the internal support, which enhances the local rigidity of the tube and avoids the problems of out-of-roundness and shrinkage during flangering. Specifically, the combination of airbag 21 and arc plate 20 has a certain degree of flexibility and can adapt to tubes of different diameters within a certain range, compensating for the roundness error of the tube. As a rigid force transmission component, the arc plate 20 avoids the airbag 21 from directly rubbing against the inner wall of the tube, while making the support force distribution more uniform and protecting the inner wall of the workpiece from damage.

[0038] like Figure 7As shown, preferably, a piston cylinder 17 is fixedly connected to the end of the support shaft 9 away from the airbag 21, a piston plate 18 is slidably connected to the inner wall of the piston cylinder 17, a piston rod 19 is fixedly connected to one end of the piston plate 18, the end of the piston rod 19 away from the piston plate 18 is connected to an external electric push rod, and a one-way valve is provided on the surface of the piston plate 18.

[0039] In this embodiment, an external electric push rod pushes the piston rod 19 and piston plate 18 to move inside the piston cylinder 17. When the piston plate 18 moves into the piston cylinder 17, the air inside the cylinder is squeezed into the hollow support shaft 9 and enters the air bladder 21 to inflate it. When demolding is required, the electric push rod is pulled back, and the piston plate 18 is reset. At this time, the medium pressure in the air bladder 21 causes the one-way valve to open, the medium to flow back, the air bladder 21 to contract, and the pressure to be stable and controllable, further increasing the local rigidity of the tubular sheet metal part.

[0040] Example 2

[0041] like Figure 2 , Figure 5 and Figure 6 As shown, based on Embodiment 1, this utility model provides a technical solution: Preferably, hydraulic cylinders 4 are fixedly connected to both sides of the fixed frame 2, and limit plates 6 are fixedly connected to the output ends of the two hydraulic cylinders 4. A sliding groove 15 is provided on the inner wall of the limit plate 6, and a slider 7 is slidably connected to the inner wall of the sliding groove 15. Two clamping pieces 8 are rotatably connected to the inner side wall of the slider 7. A support rod 16 is fixedly connected to one side of the slider 7. One end of the support rod 16 is connected to the output end of the external electric push rod. The support rod 16 and the limit plate 6 are slidably connected. The two clamping pieces 8 on the same side are symmetrically arranged. The clamping pieces 8 are arranged in an outwardly bent arc shape, and a rubber pad is provided on the inner side wall of the clamping pieces 8.

[0042] Because tubular sheet metal parts experience axial movement and circumferential rotation during the flanging process, and different tubular parts have different diameters, frequent machine stops are required for adjustment during the flanging process, which affects the work progress.

[0043] In this embodiment, the hydraulic cylinder 4 drives the limiting plate 6 to move towards the center. At this time, the clamping piece 8 hugs the outer wall of the tube from both sides. The rubber pad increases the friction and protects the surface of the workpiece from damage. At the same time, the external electric push rod pushes the support rod 16 and the slider 7 to move in the slide groove 15, adjusting the position of the tube in real time. The clamping piece 8 is arc-shaped and will expand accordingly when it contacts the surface of the tube, ensuring that the tube will not rotate during the flanging process and ensuring the forming accuracy.

[0044] Example 3

[0045] like Figure 3 and Figure 4As shown, based on Embodiment 1, this utility model provides a technical solution: Preferably, a fixing plate 11 is fixedly connected to the inner sidewall of the operating platform 5, and a plurality of support blocks 12 are slidably connected to the inner sidewall of the fixing plate 11. A spring 14 is sleeved on the outer wall of the support block 12, and the top of the spring 14 is fixedly connected to the bottom of the fixing plate 11. A disc 13 is fixedly connected to the bottom of the support block 12. A protrusion 10 is slidably connected to the inner sidewall of the operating platform 5, and the protrusion 10 and the disc 13 are slidably connected. The top of the protrusion 10 is provided with the same number of protrusions as the disc 13. The protrusions are semi-arc-shaped. The disc 13 and the support block 12 are an integral structure, and the top of the support block 12 is arc-shaped.

[0046] Because there will be a slight springback after flanging, the flanged part will hold tightly to the mold. If the flanging angle is greater than 90 degrees, the mold will be stuck by the lip of the pipe and cannot be directly retracted. This requires workers to demold, increasing their workload.

[0047] In this embodiment, after the flanging work is completed, the top of the protrusion 10 is arc-shaped to fit the shape and contour of the disc 13. After the protrusion 10 is pushed, its top abuts against the disc 13, thereby causing the support block 12 to extend from the fixing plate 11 and contact the pipe, thus pushing the pipe out. There is no need for the operator to manually demold, which reduces the burden on the operator. After the protrusion 10 is reset, the support block 12 is reset under the action of the spring 14 and is flush with the surface of the operating platform 5.

[0048] The working principle of this automatic flanging device for sheet metal parts is explained in detail below.

[0049] like Figures 1-8As shown, during operation, the tubular sheet metal part is positioned above the operating platform 5. At this time, the support shaft 9, airbag 21, and arc-shaped plate 20 extend into the tube. Gas is injected into the airbag 21, causing it to expand. This expansion pushes the arc-shaped plate 20 on the outer wall outwards until it tightly adheres to the inner wall of the tube, forming a rigid support from the inside. Simultaneously, the flanged end of the tube is flanged using the flanged part 3. This internal support effectively resists the radial force generated during flangering, enhancing the local rigidity of the tube and preventing out-of-roundness and shrinkage during flangering. Specifically, the combination of airbag 21 and arc plate 20 has a certain degree of flexibility, enabling it to adapt to pipes of different diameters within a certain range and compensate for the roundness error of the pipes. Arc plate 20, as a rigid force transmission component, avoids direct friction between airbag 21 and the inner wall of the pipe, while also making the support force distribution more uniform. An external electric push rod drives piston rod 19 and piston plate 18 to move within piston cylinder 17. When piston plate 18 moves into piston cylinder 17, the air inside the cylinder is compressed into the hollow support shaft 9 and enters airbag 21, causing it to inflate. When demolding is required, the electric push rod pulls back, and the piston plate 18 resets. At this time, the medium pressure in the air bladder 21 causes the one-way valve to open, the medium flows back, the air bladder 21 contracts, and the pressure becomes stable and controllable. The hydraulic cylinder 4 drives the limit plate 6 to move towards the center. At this time, the clamping plates 8 grip the outer wall of the pipe from both sides. The rubber pads increase the friction and protect the workpiece surface from damage. Simultaneously, the external electric push rod pushes the support rod 16 and the slider 7 to move within the slide groove 15, adjusting the position of the pipe in real time. The clamping plates 8 are arc-shaped and generate friction when they contact the surface of the pipe. The corresponding expansion ensures that the pipe will not rotate during the flanging process. After the flanging work is completed, the top of the protrusion 10 is arc-shaped and adapts to the shape and contour of the disc 13. After the protrusion 10 is pushed, its top abuts against the disc 13, thereby causing the support block 12 to extend out from the fixed plate 11 and contact the pipe, thus pushing the pipe out. There is no need for manual demolding by the staff, which reduces the burden on the staff. After the protrusion 10 is reset, the support block 12 is reset under the action of the spring 14 and is flush with the surface of the operating platform 5.

[0050] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. An automatic flanging device for sheet metal parts, comprising a frame (1); characterized in that: The top of the frame (1) is fixedly connected to a flange (3), and a fixed frame (2) is fixedly connected to the middle position of the frame (1). A support shaft (9) is provided at the middle position of the fixed frame (2). Multiple airbags (21) arranged in a circular array are fixedly connected to the outer wall of the support shaft (9). An arc plate (20) is fixedly connected to the outer wall of each airbag (21). The support shaft (9) is hollow. An operating platform (5) is fixedly connected to the inner side wall of the fixed frame (2).

2. The device according to claim 1, characterized in that: A piston cylinder (17) is fixedly connected to one end of the support shaft (9) away from the airbag (21). A piston plate (18) is slidably connected to the inner wall of the piston cylinder (17). A piston rod (19) is fixedly connected to one end of the piston plate (18). The end of the piston rod (19) away from the piston plate (18) is connected to an external electric push rod. A one-way valve is provided on the surface of the piston plate (18).

3. The device according to claim 2, characterized in that: Hydraulic cylinders (4) are fixedly connected to both sides of the fixed frame (2). Limiting plates (6) are fixedly connected to the output ends of the two hydraulic cylinders (4). A sliding groove (15) is provided on the inner wall of the limiting plate (6). A slider (7) is slidably connected to the inner wall of the sliding groove (15). Two clamping pieces (8) are rotatably connected to the inner side wall of the slider (7). A support rod (16) is fixedly connected to one side of the slider (7). One end of the support rod (16) is connected to the output end of the external electric push rod. The support rod (16) and the limiting plate (6) are slidably connected.

4. The device according to claim 3, characterized in that: Two clamping plates (8) on the same side are arranged symmetrically. The clamping plates (8) are arranged in an outwardly bent arc shape. A rubber pad is provided on the inner wall of the clamping plate (8).

5. The apparatus of claim 4, wherein: A fixing plate (11) is fixedly connected to the inner wall of the operating platform (5). Multiple support blocks (12) are slidably connected to the inner wall of the fixing plate (11). A spring (14) is sleeved on the outer wall of the support block (12). The top of the spring (14) is fixedly connected to the bottom of the fixing plate (11). A disc (13) is fixedly connected to the bottom of the support block (12). A protrusion (10) is slidably connected to the inner wall of the operating platform (5). The protrusion (10) and the disc (13) are slidably connected.

6. The device according to claim 5, characterized in that: The top of the protrusion (10) is provided with the same number of protrusions as the disk (13), and the protrusions are arranged in a semi-circular shape.

7. The device according to claim 6, characterized in that: The disc (13) and the support block (12) are an integral structure, and the top of the support block (12) is arc-shaped.

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