A door panel bending machine

Abstract

The present invention discloses a door panel bending machine, belonging to the technical field of door panel bending equipment, which includes a frame. An inlet is provided on one side of the frame. A bending table is provided on the frame at the inlet. An upper pressing plate assembly for fixing a workpiece is slidably arranged in the bending machine above the bending table. An upper bending plate assembly for bending the workpiece is arranged on one side of the upper pressing plate assembly. A lower bending plate assembly for bending the workpiece is slidably arranged in the bending machine below the bending table. Without turning the plate or lifting the plate, it can continuously achieve rapid two-time bending on one side of a Z-shaped or U-shaped door panel. Under numerical control conditions, automated processing is realized, thereby improving work efficiency, optimizing the equipment mechanism, reducing the equipment control difficulty, ensuring quality, and enhancing market competitiveness.

Description

Technical Field

[0001] The present invention relates to the technical field of door panel bending equipment, and more specifically, to a door panel bending machine. Background Art

[0002] Currently, in the sheet metal bending process, traditional bending machines are basically used. The usage method is as follows: According to the thickness and bending height of the material to be bent, select the corresponding lower knife groove width for 90° bending. When bending, the plate needs to be lifted 45°. If it is a Z-shaped bend, the workpiece must be turned over for bending. This results in low work efficiency, difficult equipment control, and poor bending quality of the workpiece. Summary of the Invention

[0003] In order to solve the problems of low work efficiency, difficult equipment control, and poor bending quality of the workpiece existing in the current traditional bending machine when bending the workpiece, the present invention provides a door panel bending machine.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A door panel bending machine includes a frame. An inlet is provided on one side of the frame. A bending table is provided on the frame at the inlet. An upper pressing plate assembly for fixing the workpiece is slidably provided in the bending machine above the bending table. An upper bending plate assembly for bending the workpiece is provided on one side of the upper pressing plate assembly. A lower bending plate assembly for bending the workpiece is slidably provided in the bending machine below the bending table.

[0006] The structure of the present invention is novel. A new structural method is adopted to bend the workpiece. The workpiece to be bent is fixed on the bending table through the upper pressing plate assembly. Then, when it is necessary to bend the workpiece downward, the upper bending plate assembly is started to bend the workpiece downward; when it is necessary to bend the workpiece upward, the lower bending plate assembly is started to bend the workpiece upward. Compared with the traditional bending process, the whole bending process does not require lifting the plate 45°, and it does not require turning the plate (surface) for Z-shaped bending. The bending accuracy is guaranteed by the numerical control clamp, so the accuracy is relatively high.

[0007] Further, the upper pressing plate assembly includes a first oil cylinder, an upper track fixing seat, an upper pressing plate, and a first slider. The first oil cylinder is fixed on the upper part of the frame. The telescopic end of the first oil cylinder is fixed on the upper pressing plate. The upper track fixing seat is fixed on the inner wall of the upper part of the inlet of the frame. The first slider is fixed on the side of the upper pressing plate close to the upper track fixing seat, and the first slider is slidably connected to the upper track fixing seat.

[0008] Further, a first insert is provided at the bottom of the upper pressing plate. A first auxiliary pressing plate is provided on the side of the first insert facing the upper bending plate assembly. A second insert is provided on the bending table. A second auxiliary pressing plate is provided on the side of the second insert facing the lower bending plate assembly.

[0009] Furthermore, the first insert and the first auxiliary pressing plate are integrally formed, and the second insert and the second auxiliary pressing plate are integrally formed; the bottom surfaces of the first insert and the first auxiliary pressing plate, and the top surfaces of the second insert and the second auxiliary pressing plate are flush and are both horizontal planes; and the first insert and the second insert, the first auxiliary pressing plate and the second auxiliary pressing plate are oppositely arranged and have the same width.

[0010] Furthermore, the upper bending plate assembly includes a second oil cylinder, an upper bending plate, a connecting block and a second slider. The second oil cylinder is fixed to the upper part of the frame. The upper bending plate is inclined and the angle between the upper bending plate and the upper pressing plate is an acute angle. One end of the connecting block is fixed to the upper bending plate, and the other end of the connecting block is provided with a track inclined surface which is slidably connected to the second slider. The second slider is fixed to one side of the upper pressing plate close to the connecting block.

[0011] Furthermore, the angle between the upper bending plate and the upper pressing plate is 10°-20°.

[0012] Furthermore, a third insert is provided at the bottom of the upper bending plate. The third insert is provided with a third auxiliary pressing plate on the side facing the upper pressing plate assembly; the third insert and the third auxiliary pressing plate are integrally formed, the bottom surfaces of the third insert and the third auxiliary pressing plate are flush, and the angle between the bottom surfaces of the third insert and the third auxiliary pressing plate and the horizontal plane is an acute angle. And when the right end of the third auxiliary pressing plate moves to be flush with the left end of the second auxiliary pressing plate, the distance between the right end of the third auxiliary pressing plate and the left end of the second auxiliary pressing plate is 0-2 mm more than the thickness of the workpiece to be bent.

[0013] Furthermore, the lower bending plate assembly includes a third oil cylinder, a third slider, a lower bending plate and a lower track fixing seat. The third oil cylinder is fixed to the lower part of the frame. The lower track fixing seat is fixed to the inner wall of the lower part of the feeding port of the frame. The third slider is fixed to one side of the lower bending plate close to the lower track fixing seat. The lower track fixing seat is provided with an inclined surface on the side close to the lower bending plate. The third slider is slidably connected to the inclined surface, and the angle between the inclined surface and the vertical line is an acute angle.

[0014] Furthermore, a fourth insert is provided at the top of the lower bending plate. A bending surface is milled on the fourth insert. The angle between the bending surface and the horizontal line is an acute angle. And when the right end of the bending surface moves to be flush with the left end of the first auxiliary pressing plate, the distance between the right end of the bending surface and the left end of the first auxiliary pressing plate is 0-2 mm more than the thickness of the workpiece to be bent.

[0015] Furthermore, the angle between the bottom surfaces of the third insert and the third auxiliary pressing plate and the horizontal plane is 10°-20°; the angle between the inclined surface and the vertical line is 10°-20°; the angle between the bending surface and the horizontal line is 10°-20°.

[0016] The beneficial effects of the present invention compared with the prior art are:

[0017] 1. The structure of the present invention is novel and has strong practicability. When compared with traditional bending, the bending machine provided by the present invention does not require lifting the plate by 45°, and does not require turning the plate (surface) for Z-shaped bending. The bending accuracy is ensured by a numerical control clamp, so the accuracy is relatively high. It is very suitable for bending thin plates with a thickness of less than 1 mm.

[0018] 2. The bending machine provided by the present invention can continuously achieve two rapid bends on one side of a Z-shaped or U-shaped door panel without turning the plate or lifting the plate. Under numerical control conditions, automated processing is realized, thereby improving work efficiency, optimizing the equipment mechanism, reducing the difficulty of equipment control, ensuring quality, and enhancing market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic side view structure diagram of a door panel bending machine of the present invention;

[0020] Figure 2 is Figure 1 a partial enlarged schematic diagram of A in

[0021] Figure 3 is a front view of a door panel bending machine of the present invention;

[0022] Figure 4 is a schematic diagram of bending a workpiece into a U-shape by a door panel bending machine of the present invention;

[0023] Figure 5 is a schematic diagram of bending a workpiece into a Z-shape with two right angles by a door panel bending machine of the present invention;

[0024] Figure 6 is a schematic diagram of bending a workpiece into a Z-shape with two acute angles by a door panel bending machine of the present invention.

[0025] Markings in the figure: 1 - frame, 2 - second oil cylinder, 3 - upper bending plate, 4 - connecting block, 5 - first oil cylinder, 6 - upper track fixing seat, 7 - first slider, 8 - upper pressing plate, 9 - second slider, 10 - lower bending plate, 11 - third oil cylinder, 12 - third slider, 13 - bending table, 14 - third insert, 15 - third auxiliary pressing plate, 16 - first insert, 17 - first auxiliary pressing plate, 18 - second auxiliary pressing plate, 19 - second insert, 20 - fourth insert, 21 - bending surface, 22 - feeding port, 23 - front upper panel, 24 - front lower panel, 25 - workpiece, 26 - lower track fixing seat. DETAILED DESCRIPTION OF THE INVENTION

[0026] The present invention will be further described below in conjunction with embodiments. The described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0027] Embodiment:

[0028] As Figure 1 and 3 shown, a door panel bending machine includes a frame 1. In this embodiment, the frame 1 is formed by welding or screwing two left and right side plates, a rear panel, a front upper panel 23 and a front lower panel 24, which constitutes a hollow frame 1 structure. An inlet 22 is provided on one side of the frame 1. The inlet 22 is composed of a gap reserved between the front upper panel 23 and the front lower panel 24, and a U-shaped groove provided at a position opposite to the gap between the two left and right side plates and communicating with the gap. A bending table 13 is provided on the frame 1 at the inlet 22, and the bending table 13 is fixed on the front lower panel 24. The function of the inlet 22 is to bend a workpiece 25 wider than the width of the bending machine. Of course, the height of the bend mainly depends on the height between the front upper panel 23 and the front lower panel 24, and is mostly used for local bending.

[0029] A upper pressing plate assembly for fixing the workpiece 25 is slidably provided in the bending machine above the bending table 13. The upper pressing plate assembly is fixed on the front upper panel 23. An upper bending plate assembly for bending the workpiece 25 is provided on one side of the upper pressing plate assembly. A lower bending plate assembly for bending the workpiece 25 is slidably provided in the bending machine below the bending table 13.

[0030] In this embodiment, the upper pressing plate assembly includes a first oil cylinder 5, an upper track fixing seat 6, an upper pressing plate 8 and a first slider 7. The first oil cylinder 5 is fixed on the upper part of the frame 1. The telescopic end of the first oil cylinder 5 is fixed on the upper pressing plate 8. The upper track fixing seat 6 is fixed on the inner wall of the frame 1 above the inlet 22. The first slider 7 is fixed on one side of the upper pressing plate 8 close to the upper track fixing seat 6, and the first slider 7 is slidably connected to the upper track fixing seat 6. The first oil cylinder 5 can be installed on the top inside the frame 1 or outside above the frame 1, mainly to meet the requirement of driving the upper pressing plate 8 to move straight up and down. There are two first sliders 7, which are fixed on the upper pressing plate 8 by bolts. The first slider 7 is slidably connected to the chute on the upper track fixing seat 6. By setting the first slider 7 and the upper track fixing seat 6, the upper pressing plate 8 can move more stably in the vertical direction. It is more convenient to firmly press the workpiece 25 to be bent.

[0031] The structure of the present invention is novel. A brand-new structural method is adopted to bend the workpiece 25. The workpiece 25 to be bent is fixed on the bending table 13 through the upper pressing plate assembly. Then, when it is necessary to bend the workpiece 25 downward, the upper bending plate assembly is started to bend the workpiece 25 downward; when it is necessary to bend the workpiece 25 upward, the lower bending plate assembly is started to bend the workpiece 25 upward. Compared with the traditional bending process, during the whole bending process, there is no need to lift the plate by 45°, and there is no need to turn the plate (surface) for Z-shaped bending. The bending accuracy is ensured by the numerical control clamp, so the accuracy is relatively high.

[0032] Embodiment 2:

[0033] As Figure 2 shown, this embodiment is further optimized on the basis of Embodiment 1. This embodiment focuses on the improvements compared with Embodiment 1, and the same parts will not be elaborated again. In this embodiment, a first insert 16 is provided at the bottom of the upper pressing plate 8, and a first auxiliary pressing plate 17 is provided on the side of the first insert 16 facing the upper bending plate assembly; a second insert 19 is provided on the bending table 13, and a second auxiliary pressing plate 18 is provided on the side of the second insert 19 facing the lower bending plate assembly. The first insert 16 and the upper pressing plate 8, and the second insert 19 and the bending table 13 are both connected by bolts. This is because after using for a period of time, the parts in contact with the workpiece 25 at the bottom of the upper pressing plate 8 and the top of the bending table 13 will be worn. The reason for using inserts is to facilitate replacement, save production costs, and the replacement is more convenient.

[0034] The settings of the first auxiliary pressing plate 17 and the second auxiliary pressing plate 18 are to assist in tightly pressing the workpiece 25 to be bent. Among them, the cross-sections of the first auxiliary pressing plate 17 and the second auxiliary pressing plate 18 are both right-angled triangles, and the hypotenuses of the right-angled triangles of the first auxiliary pressing plate 17 and the second auxiliary pressing plate 18 are arranged away from each other, and the tips of the right-angled triangles of the first auxiliary pressing plate 17 and the second auxiliary pressing plate 18 are arranged facing the upper bending plate assembly. Generally, the angle between the hypotenuse of the right-angled triangle and the horizontal plane is 10°-20°.

[0035] The advantage of doing this is that it can not only ensure the stability of the workpiece 25 to be bent being pressed, but also provide a bending space, that is, when the workpiece 25 to be bent is bent into 90°, it can continue to be bent, and the workpiece 25 to be bent can be bent into an acute angle.

[0036] Preferably, the first insert 16 and the first auxiliary pressing plate 17 are integrally formed, and the second insert 19 and the second auxiliary pressing plate 18 are integrally formed; the bottom surfaces of the first insert 16 and the first auxiliary pressing plate 17, and the top surfaces of the second insert 19 and the second auxiliary pressing plate 18 are flush and are both horizontal planes; and the first insert 16 and the second insert 19, and the first auxiliary pressing plate 17 and the second auxiliary pressing plate 18 are oppositely arranged and have the same width. This is convenient for processing and manufacturing. By using steel inserts, the weight of the tool is effectively reduced and the bending strength is ensured. Its triangular tip structure can meet the requirement that the bending angle of the thin plate is ≤ 90°.

[0037] Embodiment 3:

[0038] As Figure 2 shown, this embodiment is further optimized on the basis of Embodiment 2. This embodiment focuses on the improvements compared with Embodiment 1, and the same parts will not be described again. In this embodiment, the upper bending plate assembly includes a second oil cylinder 2, an upper bending plate 3, a connecting block 4 and a second slider 9. The second oil cylinder 2 is fixed on the upper part of the frame 1. The upper bending plate 3 is inclined, and the angle between the upper bending plate 3 and the upper pressing plate 8 is an acute angle. One end of the connecting block 4 is fixed on the upper bending plate 3, and the other end of the connecting block 4 is provided with a track inclined surface, and the track inclined surface is slidably connected with the second slider 9. The second slider 9 is fixed on one side of the upper pressing plate 8 close to the connecting block 4. When the upper pressing plate 8 moves up and down driven by the first oil cylinder 5, the upper pressing plate 8 will drive the connecting block 4 to move up and down together. The connecting block 4 will drive the upper bending plate 3 through the second slider 9. That is, when the upper pressing plate 8 moves, the second oil cylinder 2 is in a contracted state, and the upper bending plate 3 is linked with the upper pressing plate 8 by hinging with the telescopic arm of the second oil cylinder 2.

[0039] The upper bending plate 3 is arranged in an inclined shape so that the bottom of the upper bending plate 3 can cooperate with the first insert 16 of the upper pressing plate 8 driven by the second oil cylinder 2, which is convenient for bending the workpiece 25 at the bending part of the workpiece 25. When the upper bending plate 3 makes a linear motion on the track inclined surface under the action of the second oil cylinder 2, the motion of the upper bending plate 3 on the track inclined surface will be divided into a vertically downward motion and a horizontally rightward motion. Therefore, the upper bending plate 3 can not only bend the workpiece 25 into 90°, but also bend the bending plate into an acute angle less than 90°, such as a Z shape, etc., making the production more flexible.

[0040] Preferably, the angle between the upper bending plate 3 and the upper pressing plate 8 is 10° - 20°. Within this angle range, the power for the second oil cylinder 2 to press down is more labor-saving, and the workpiece can be bent into common angles.

[0041] In this embodiment, a third insert 14 is provided at the bottom of the upper bending plate 3, and a third auxiliary pressing plate 15 is provided on the side of the third insert 14 facing the upper pressing plate assembly; the third insert 14 and the third auxiliary pressing plate 15 are integrally formed, the bottom surfaces of the third insert 14 and the third auxiliary pressing plate 15 are flush, and the included angle between the bottom surfaces of the third insert 14 and the third auxiliary pressing plate 15 and the horizontal plane is an acute angle. When the right end of the third auxiliary pressing plate 15 moves to be flush with the left end of the second auxiliary pressing plate 18, the distance between the right end of the third auxiliary pressing plate 15 and the left end of the second auxiliary pressing plate 18 is 0 - 2 mm more than the thickness of the workpiece 25 to be bent. The third insert 14 also has the advantage of being easy to replace. However, setting the third insert 14 in an inclined shape also has the benefit of extending the service life of the third insert 14. That is, when the third insert 14 bends the workpiece 25, the contact state with the workpiece 25 is: point contact - surface contact - point contact, that is, first the left end of the third insert 14, then the plane formed by the third insert 14 and the third auxiliary pressing plate 15, and then the end of the third auxiliary pressing plate 15. Thus, the part that first comes into contact wears the most. Therefore, the third insert 14 and the third auxiliary pressing plate 15 are set in an inclined shape to increase the service life.

[0042] Embodiment 4:

[0043] As Figure 2 shown, this embodiment is a further optimization based on Embodiment 3. This embodiment focuses on the improvements compared with Embodiment 1, and the same parts will not be described again. In this embodiment, the lower bending plate assembly includes a third oil cylinder 11, a third slider 12, a lower bending plate 10, and a lower track fixing seat 26. The third oil cylinder 11 is fixed at the lower part of the frame 1, the lower track fixing seat 26 is fixed on the inner wall of the lower part of the feeding port 22 of the frame 1, the third slider 12 is fixed on the side of the lower bending plate 10 close to the lower track fixing seat 26, and the lower track fixing seat 26 is provided with an inclined surface on the side close to the lower bending plate 10. The third slider 12 is slidably connected to the inclined surface, and the included angle between the inclined surface and the vertical line is an acute angle. The advantage of the lower bending plate 10 being inclined and arranged on the inclined surface of the lower track fixing seat is that when the lower bending plate 10 makes a linear motion on the inclined surface under the action of the third oil cylinder 11, the motion of the lower bending plate 10 on the inclined surface will be divided into a vertically upward motion and a horizontally rightward motion. Therefore, the lower bending plate 10 can not only bend the workpiece 25 into 90°, but also bend the bending plate into an acute angle less than 90°, such as a Z - shape, etc., making the production more flexible.

[0044] In this embodiment, a fourth insert 20 is provided at the top of the lower bending plate 10. A bending surface 21 is milled on the fourth insert 20. The angle between the bending surface 21 and the horizontal line is an acute angle. When the right end of the bending surface 21 moves to be flush with the left end of the first auxiliary pressing plate 17, the distance between the right end of the bending surface 21 and the left end of the first auxiliary pressing plate 17 is 0 - 2 mm more than the thickness of the workpiece 25 to be bent. This thickness can meet the bending requirements of most thin plate workpieces 25. If the thickness increases, the insert can be replaced with a matching one, and the bending principle remains unchanged. In addition to being easy to replace and cost-saving like the first insert 16, the function of the fourth insert 20 is that the bending surface 21 provided thereon can ensure that when the lower bending plate 10 first contacts the workpiece 25, it is the right end part of the bending surface 21 of the fourth insert 20 close to the bending part of the workpiece 25, which is convenient for ensuring the accuracy and quality of the bending part.

[0045] Embodiment 5:

[0046] As Figure 2 shown, this embodiment is a further optimization based on Embodiment 4. This embodiment focuses on the improvements compared with Embodiment 1, and the same parts will not be elaborated again. In this embodiment, the angles between the bottom surfaces of the third insert 14 and the third auxiliary pressing plate 15 and the horizontal plane are 10° - 20°; preferably 15°. The angle between the inclined surface and the vertical line is 10° - 20°; preferably 15°. The angle between the bending surface 21 and the horizontal line is 10° - 20°; preferably 15°.

[0047] The upper rail fixing seat 6 and the upper pressing plate 8 can move relatively up and down through the first slider 7 driven by the first oil cylinder 5; the upper pressing plate 8 and the upper bending plate 3 are connected through the second slider 9. When the upper pressing plate 8 is pressed to the bottom dead center by the action of the first oil cylinder 5 and the workpiece 25 is clamped tightly, when downward bending is required, the upper bending plate 3 starts to move, and its moving power is realized by the second oil cylinder 2 pushing the upper bending plate 3. Conversely, when the second oil cylinder 2 retracts, it drives the upper bending plate 3 to return to its original position; the lower bending plate 10 is connected to the lower rail fixing seat through the third slider 12. When the upper pressing plate 8 is pressed to the bottom dead center, when upward bending is required, the lower bending plate 10 starts to move, and its moving power is realized by the third oil cylinder 11 pushing the lower bending plate 10. Conversely, when the third oil cylinder 11 retracts, it drives the lower bending plate 10 to return to its original position.

[0048] Taking the Z-shaped bending as an example, the thin plate workpiece 25 is fed onto the bending table 13 through a numerical control clamp. The upper pressing plate 8 is pressed to the bottom dead center by the power mechanism of the first oil cylinder 5. The upper bending plate 3 is pressed downwards by the second oil cylinder 2 to make the first 90° bend, and then the upper bending plate 3 and the upper pressing plate 8 return to their original positions simultaneously; the thin plate workpiece 25 is fed onto the bending table 13 again through the numerical control clamp for a certain (bending) distance. The upper pressing plate 8 is pressed to the bottom dead center again. The lower bending plate 10 is jacked upwards at an angle of 15° in the vertical direction by the third oil cylinder 11 to complete the second 90° bend, and then the lower bending plate 10 and the upper pressing plate 8 return to their original positions simultaneously; the entire Z-shaped door panel bending is completed. At this time, the Z-shaped workpiece 25 has two 90° bends, and the finished product is as Figure 5 shown. If two acute-angle bends are required, when the upper bending plate 3 moves linearly on the track inclined plane under the action of the second oil cylinder 2, the movement of the upper bending plate 3 on the track inclined plane can be divided into a vertically downward movement and a horizontally rightward movement. Therefore, after the upper bending plate 3 is pressed downwards by the second oil cylinder 2 to make the first 90° bend, it continues to move downward for a certain distance under the track to bend the workpiece 25 into the desired acute angle; then the upper bending plate 3 returns;

[0049] the lower bending plate 10 is jacked upwards at an angle of 15° in the vertical direction by the third oil cylinder 11. After the second 90° bend is completed, it continues to be jacked upwards for a certain distance to bend the workpiece 25 into the desired acute angle, and the finished product is as Figure 6 shown.

[0050] Taking the U-shaped bending as an example, the thin plate workpiece 25 is fed onto the bending table 13 through a numerical control clamp. The upper pressing plate 8 is pressed to the bottom dead center under the action of the first oil cylinder 5 and the first slide rail. After the workpiece 25 is clamped tightly, the lower bending plate 10 is jacked upwards at an angle of 15° in the vertical direction by the third oil cylinder 11 to complete the first 90° bend, and then the lower bending plate 10 and the upper pressing plate 8 return to their original positions simultaneously; the thin plate workpiece 25 is fed onto the bending table 13 again through the numerical control clamp for a certain (bending) distance, and the above actions are repeated to complete the second 90° bend, and then the lower bending plate 10 and the upper pressing plate 8 return to their original positions simultaneously; the entire U-shaped door panel bending is completed; the finished product is as Figure 4 shown.

[0051] Compared with the existing traditional 90° bending method, the plate is not lifted during bending, and the Z-shaped bending does not require turning the plate.

[0052] At the same time, another function of setting the first insert 16, the second insert 19, the third insert 14 and the fourth insert 20 is that the corresponding inserts can be adjusted and replaced according to the thickness of the bent workpiece 25, and the distance between the inserts can be adjusted to meet the bending of the workpiece 25, and its bending principle remains unchanged.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A door panel bending machine, comprising a frame (1), and a feeding port (22) is provided on one side of the frame (1), characterized in that, A bending table (13) is provided on the frame (1) at the feed inlet (22). A pressure plate assembly for fixing a workpiece (25) is slidably provided in a bending machine above the bending table (13). An upper bending plate assembly for bending the workpiece (25) is provided on one side of the pressure plate assembly. A lower bending plate assembly for bending the workpiece (25) is slidably provided in a bending machine below the bending table (13). The upper bending plate assembly includes a second oil cylinder (2), an upper bending plate (3), a connecting block (4) and a second slider (9). The second oil cylinder (2) is fixed to the upper part of the frame (1). The upper bending plate (3) is inclined, and the included angle between the upper bending plate (3) and the upper pressure plate (8) is an acute angle. One end of the connecting block (4) is fixed to the upper bending plate (3), and the other end of the connecting block (4) is provided with a track inclined surface which is slidably connected to the second slider (9). The second slider (9) is fixed to the side of the upper pressure plate (8) close to the connecting block (4). A third insert (14) is provided at the bottom of the upper bending plate (3). A third auxiliary pressure plate (15) is provided on the side of the third insert (14) facing the pressure plate assembly. The third insert (14) and the third auxiliary pressure plate (15) are integrally formed. The bottom surfaces of the third insert (14) and the third auxiliary pressure plate (15) are flush, and the included angle between the bottom surfaces of the third insert (14) and the third auxiliary pressure plate (15) and the horizontal plane is an acute angle. When the right end of the third auxiliary pressure plate (15) moves to be flush with the left end of the second auxiliary pressure plate (18), the distance between the right end of the third auxiliary pressure plate (15) and the left end of the second auxiliary pressure plate (18) is 0 - 2 mm more than the thickness of the workpiece (25) to be bent. The upper pressure plate assembly includes a first oil cylinder (5), an upper track fixing seat (6), an upper pressure plate (8) and a first slider (7). The first oil cylinder (5) is fixed to the upper part of the frame (1). The telescopic end of the first oil cylinder (5) is fixed to the upper pressure plate (8). The upper track fixing seat (6) is fixed to the inner wall above the feed inlet (22) of the frame (1). The first slider (7) is fixed to the side of the upper pressure plate (8) close to the upper track fixing seat (6), and the first slider (7) is slidably connected to the upper track fixing seat (6). The lower bending plate assembly includes a third oil cylinder (11), a third slider (12), a lower bending plate (10) and a lower track fixing seat (26). The third oil cylinder (11) is fixed to the lower part of the frame (1). The lower track fixing seat is fixed to the inner wall below the feed inlet (22) of the frame (1). The third slider (12) is fixed to the side of the lower bending plate (10) close to the lower track fixing seat (26). The lower track fixing seat (26) is provided with an inclined surface on the side close to the lower bending plate (10). The third slider (12) is slidably connected to the inclined surface, and the included angle between the inclined surface and the vertical line is an acute angle. A first insert (16) is provided at the bottom of the upper pressing plate (8), and a first auxiliary pressing plate (17) is provided on the side of the first insert (16) facing the upward bending plate assembly; a second insert (19) is provided on the bending table (13), and a second auxiliary pressing plate (18) is provided on the side of the second insert (19) facing the downward bending plate assembly; The included angle between the upper bending plate (3) and the upper pressing plate (8) is 10°-20°.

2. The panel bender according to claim 1, characterized in that, The first insert (16) and the first auxiliary pressing plate (17) are integrally formed, and the second insert (19) and the second auxiliary pressing plate (18) are integrally formed; the bottom surfaces of the first insert (16) and the first auxiliary pressing plate (17), and the top surfaces of the second insert (19) and the second auxiliary pressing plate (18) are flush and are both horizontal planes; and the first insert (16) and the second insert (19), the first auxiliary pressing plate (17) and the second auxiliary pressing plate (18) are oppositely arranged and have the same width.

3. The panel bender according to claim 1, characterized in that, A fourth insert (20) is provided at the top of the lower bending plate (10), a bending surface (21) is milled on the fourth insert (20), the included angle between the bending surface (21) and the horizontal line is an acute angle, and when the right end of the bending surface (21) moves to be flush with the left end of the first auxiliary pressing plate (17), the distance between the right end of the bending surface (21) and the left end of the first auxiliary pressing plate (17) is 0-2 mm more than the thickness of the workpiece to be bent (25).

4. The panel bender according to claim 1, characterized in that, The included angle between the bottom surfaces of the third insert (14) and the third auxiliary pressing plate (15) and the horizontal plane is 10°-20°; the included angle between the inclined surface and the vertical line is 10°-20°; the included angle between the bending surface (21) and the horizontal line is 10°-20°.

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