CN111097819A

CN111097819A - Door plate bending machine

Info

Publication number: CN111097819A
Application number: CN201911337748.XA
Authority: CN
Inventors: 李光赋
Original assignee: Hubei Hele Door Industry Co Ltd
Current assignee: Hubei Hele Door Industry Co Ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-05-05

Abstract

The invention discloses a door plate bending machine, which belongs to the technical field of door plate bending equipment and comprises a frame, wherein a feed inlet is formed in one side of the frame, a bending table is arranged on the frame at the feed inlet, an upper pressing plate assembly used for fixing a workpiece is arranged in the bending machine on the upper portion of the bending table in a sliding manner, an upper bending plate assembly used for bending the workpiece is arranged on one side of the upper pressing plate assembly, and a lower bending plate assembly used for bending the workpiece is arranged in the bending machine on the lower portion of the bending table. Under the condition of not turning over the board, not lifting the board, can realize the quick twice bending on one side of Z style of calligraphy or U style of calligraphy door plant in succession, under the numerical control condition, realize automated processing to improve work efficiency, optimize equipment mechanism, reduce the equipment control degree of difficulty, guarantee quality, promote market competition.

Description

Door plate bending machine

Technical Field

The invention relates to the technical field of door plate bending equipment, in particular to a door plate bending machine.

Background

At present, a traditional bending machine is basically adopted in a metal plate bending process, and the using method comprises the following steps: according to the thickness and the bending height of a bent material, the corresponding width of the lower tool groove is selected for 90-degree bending, the plate needs to be lifted by 45 degrees during bending, and if the bent plate is Z-shaped, the bent plate needs to be turned over for bending. The work efficiency is low, the equipment control difficulty is high, and the bending quality of the workpiece is poor.

Disclosure of Invention

The invention provides a door plate bending machine, aiming at solving the problems of low working efficiency, high equipment control difficulty and poor workpiece bending quality of the traditional bending machine during workpiece bending.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a door plant bender, includes the frame, has seted up the feed inlet in one side of frame, is equipped with the platform of bending in the frame of feed inlet department, and it is equipped with the top board subassembly that is used for fixed work piece to slide in the bender on platform upper portion of bending, is equipped with the last bending plate subassembly that is used for the work piece to bend in one side of top board subassembly, and it is equipped with the lower bending plate subassembly that is used for the work piece to bend to slide in the bender.

The workpiece bending device is novel in structure, a brand new structural mode is adopted for bending the workpiece, the workpiece to be bent is fixed on the bending table through the upper pressing plate assembly, and then when the workpiece needs to be bent downwards, the upper bending plate assembly is started to bend the workpiece downwards; when a workpiece needs to be bent upwards, the lower bending plate assembly is started to bend the workpiece upwards, compared with the traditional bending process, the whole bending process is free from lifting the plate by 45 degrees, the Z-shaped bending is free from turning the plate (surface), the bending precision is guaranteed through the numerical control clamp, and therefore the precision is high.

Further, the upper pressure plate assembly comprises a first oil cylinder, an upper rail fixing seat, an upper pressure plate and a first sliding block, the first oil cylinder is fixed to the upper portion of the frame, the telescopic end of the first oil cylinder is fixed to the upper pressure plate, the upper rail fixing seat is fixed to the inner wall of the upper portion of the feed port of the frame, the first sliding block is fixed to one side, close to the upper rail fixing seat, of the upper pressure plate, and the first sliding block is connected to the upper rail fixing seat in a sliding mode.

Further, a first insert is arranged at the bottom of the upper pressure plate, and a first auxiliary pressure plate is arranged on one side, facing the upper bending plate assembly, of the first insert; and a second insert is arranged on the bending table, and a second auxiliary pressing plate is arranged on one side of the second insert, which faces the downward bending plate assembly.

Further, 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 level and are horizontal surfaces; and the first insert and the second insert, the first auxiliary pressing plate and the second auxiliary pressing plate are all arranged oppositely and have the same width.

Further, the plate assembly of bending on includes the second hydro-cylinder, the board of bending on, connecting block and second slider, and the second hydro-cylinder is fixed on frame upper portion, and the board slope setting of bending on and the contained angle of bending between board and the top board are the acute angle, and the one end of connecting block is fixed on the board of bending on, and the other end of connecting block is equipped with the track inclined plane, track inclined plane and second slider sliding connection, the second slider is fixed in the one side that the top board is close to the connecting block.

Furthermore, the included angle between the upper bending plate and the upper pressure plate is 10-20 degrees.

Further, a third insert is arranged at the bottom of the upper bending plate, and a third auxiliary pressing plate is arranged on one side, facing the upper pressing plate assembly, of the third insert; 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 parallel and level, an included 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 parallel and level 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 0-2mm more than the thickness of a workpiece to be bent.

Further, the plate assembly of bending down includes third hydro-cylinder, third slider, the plate of bending down and lower track fixing base, the third hydro-cylinder is fixed in the lower part of frame, and lower track fixing base is fixed on the inner wall of frame feed inlet lower part, and the third slider is fixed in the one side that the plate of bending down is close to lower track fixing base, and lower track fixing base is equipped with the inclined plane in the one side that is close to the plate of bending down, third slider sliding connection be in on the inclined plane, contained angle between inclined plane and the vertical line is the acute angle.

Furthermore, a fourth insert is arranged at the top of the lower bending plate, a bending surface is milled on the fourth insert, an included angle between the bending surface and a 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 0-2mm greater than the thickness of a workpiece to be bent.

Furthermore, the included angle between the bottom surfaces of the third insert and the third auxiliary pressure plate and the horizontal plane is 10-20 degrees; the included angle between the inclined plane and the vertical line is 10-20 degrees; the included angle between the bending surface and the horizontal line is 10-20 degrees.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention has novel structure and strong practicability; compared with the traditional bending, the bending machine provided by the invention has the advantages that the plate does not need to be lifted by 45 degrees, the Z-shaped bending does not need to be carried out, the plate (surface) is not turned, the bending precision is ensured by a numerical control clamp, and the precision is higher. Is very suitable for bending thin plates with the thickness of less than 1 mm.

2. The bending machine provided by the invention can continuously realize rapid two-time bending of one side of a Z-shaped or U-shaped door plate under the conditions of no plate turning and no plate lifting, and realizes automatic processing under the numerical control condition, thereby improving the working efficiency, optimizing the equipment mechanism, reducing the equipment control difficulty, ensuring the quality and improving the market competitiveness.

Drawings

Fig. 1 is a side view schematic diagram of a bending machine for door panels according to the present invention;

FIG. 2 is an enlarged partial schematic view of A of FIG. 1;

FIG. 3 is a front view of a door panel bending machine of the present invention;

FIG. 4 is a schematic diagram of a bending machine for door plates according to the present invention for bending a workpiece into a U-shape;

FIG. 5 is a schematic diagram of a bending machine for door panels according to the present invention for bending a workpiece into two right-angled Z-shapes;

fig. 6 is a schematic diagram of a zigzag shape for bending a workpiece into two acute angles by using a door plate bending machine according to the invention.

The labels in the figure are: 1-frame, 2-second oil cylinder, 3-upper bending plate, 4-connecting block, 5-first oil cylinder, 6-upper rail fixing seat, 7-first slide block, 8-upper pressing plate, 9-second slide block, 10-lower bending plate, 11-third oil cylinder, 12-third slide block, 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 hole, 23-front upper panel, 24-front lower panel, 25-workpiece and 26-lower rail fixing seat.

Detailed Description

The present invention will be further described with reference to the following examples, which are intended to illustrate only some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, other embodiments used by those skilled in the art without any creative effort belong to the protection scope of the present invention.

Example (b):

as shown in fig. 1 and 3, a door panel bending machine includes a frame 1, in its embodiment, the frame 1 is formed by welding or screwing a left side plate, a right side plate, a rear panel, a front upper panel 23 and a front lower panel 24, which form a hollow frame 1 framework. A feed inlet 22 is formed in one side of the machine frame 1, the feed inlet 22 is composed of a gap reserved between a front upper panel 23 and a front lower panel 24, a U-shaped groove communicated with the gap is formed in the position, opposite to the gap, between a left side plate and a right side plate, a bending table 13 is arranged on the machine frame 1 at the position of the feed inlet 22, and the bending table 13 is fixed on the front lower panel 24. The purpose of the feed opening 22 is to enable bending of a workpiece 25 that is wider than the width of the bending machine, although the height of the bend is mainly determined by the height between the upper front panel 23 and the lower front panel 24, and is most useful for local bending.

An upper pressing plate assembly used for fixing the workpiece 25 is arranged in the bending machine on the upper portion of the bending table 13 in a sliding mode, the upper pressing plate assembly is fixed on the front upper panel 23, an upper bending plate assembly used for bending the workpiece 25 is arranged on one side of the upper pressing plate assembly, and a lower bending plate assembly used for bending the workpiece 25 is arranged in the bending machine on the lower portion of the bending table 13 in a sliding mode.

In this embodiment, the top board assembly includes first hydro-cylinder 5, upper track fixing base 6, top board 8 and first slider 7, and first hydro-cylinder 5 is fixed on 1 upper portion of frame, and the flexible end of first hydro-cylinder 5 is fixed on top board 8, and upper track fixing base 6 is fixed on the inner wall on 1 feed inlet 22 upper portion of frame, and first slider 7 is fixed in the one side that upper board 8 is close to upper track fixing base 6, and first slider 7 sliding connection is on upper track fixing base 6. The first oil cylinder 5 can be arranged on the top in the rack 1 or on the outside above the rack 1, and mainly meets the requirement that the upper pressing plate 8 can be driven to move vertically. First slider 7 has two, through the bolt fastening on top board 8, first slider 7 and the spout sliding connection on the last track fixing base 6. Through the arrangement of the first sliding block 7 and the upper rail fixing seat 6, the stability of the upper pressing plate 8 in the reciprocating motion in the vertical direction is better. The workpiece 25 to be bent is more conveniently and stably pressed.

The bending machine is novel in structure, a brand-new structural mode is adopted for bending the workpiece 25, the workpiece 25 to be bent is fixed on the bending table 13 through the upper pressing plate assembly, and then when the workpiece 25 needs to be bent downwards, the upper bending plate assembly is started to bend the workpiece 25 downwards; when the workpiece 25 needs to be bent upwards, the lower bending plate assembly is started to bend the workpiece 25 upwards, compared with the traditional bending process, the whole bending process is free from lifting the plate by 45 degrees, the Z-shaped bending is free from turning the plate (surface), the bending precision is guaranteed through the numerical control clamp, and therefore the precision is high.

Example 2:

as shown in fig. 2, this embodiment is further optimized based on embodiment 1, and this embodiment focuses on the improvement compared to embodiment 1, and the details of the same are not repeated, in this embodiment, a first insert 16 is disposed at the bottom of the upper platen 8, and a first auxiliary platen 17 is disposed on one side of the first insert 16 facing the upward bending plate assembly; a second insert 19 is arranged on the bending table 13, and a second auxiliary pressing plate 18 is arranged on one side, facing the downward bending plate assembly, of the second insert 19. The first insert 16 is connected with the upper pressing plate 8, the second insert 19 is connected with the bending table 13 through bolts, and after the first insert is used for a period of time, the parts of the bottom of the upper pressing plate 8 and the top of the bending table 13, which are contacted with the workpiece 25, are abraded.

The first auxiliary pressing plate 17 and the second auxiliary pressing plate 18 are arranged to press the workpiece 25 to be bent in an auxiliary manner, wherein the cross sections of the first auxiliary pressing plate 17 and the second auxiliary pressing plate 18 are both in a right triangle shape, the hypotenuse of the right triangle shape of the first auxiliary pressing plate 17 is arranged opposite to the hypotenuse of the right triangle shape of the second auxiliary pressing plate 18, and the tip of the right triangle shape of the first auxiliary pressing plate 17 and the tip of the right triangle shape of the second auxiliary pressing plate 18 are arranged towards the upward bending plate assembly. The included angle between the hypotenuse of the right triangle and the horizontal plane is generally 10-20 deg..

The advantage of doing so can guarantee the literary stability that the work piece 25 that waits to bend was suppressed, can provide the space of bending again, promptly after the work piece 25 that waits to bend is bent 90, can continue to bend, can bend the work piece 25 that waits to bend into the acute angle.

Preferably, first insert 16 and first auxiliary platen 17 are integrally formed, and second insert 19 and second auxiliary platen 18 are integrally formed; the bottom surfaces of first insert 16 and first auxiliary pressing plate 17, and the top surfaces of second insert 19 and second auxiliary pressing plate 18 are level and level; and first and

second inserts

16 and 19, and first and second

auxiliary platens

17 and 18 are all disposed opposite to each other and have the same width. Is convenient for processing and manufacturing. By adopting the steel insert, the weight of the cutter is effectively reduced, and the bending strength is ensured. The triangle tip structure can meet the requirement that the bending angle of the thin plate is less than or equal to 90 degrees.

Example 3:

as shown in fig. 2, this embodiment is further optimized on the basis of embodiment 2, this embodiment focuses on explaining the improved parts compared with embodiment 1, and the same parts are not repeated, 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 portion of the frame 1, the upper bending plate 3 is inclined and the included 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, the other end of the connecting block 4 is provided with a track inclined plane, the track inclined plane is slidably connected with the second slider 9, and the second slider 9 is fixed on one side of the upper pressing plate 8 close to the connecting block 4. When the upper press plate 8 moves up and down under the driving of the first oil cylinder 5, the upper press plate 8 can drive the connecting block 4 to move up and down together, the connecting block 4 can be linked with the upper bending plate 3 through the second sliding block 9, namely, when the upper press plate 8 moves, the second oil cylinder 2 is in a contraction state, and the upper bending plate 3 is hinged with the telescopic arm of the second oil cylinder 2 to realize the linkage with the upper press plate 8.

The upper bending plate 3 is arranged to be inclined so that the bottom of the upper bending plate 3 can be matched with the first insert 16 of the upper pressing plate 8 under the driving of the second oil cylinder 2, and the workpiece 25 can be conveniently bent at the bending position of the workpiece 25. When the upper bending plate 3 is in linear motion on the track inclined plane under the action of the second oil cylinder 2, the motion of the upper bending plate 3 on the track inclined plane can be divided into vertical downward motion and horizontal rightward motion, so that the upper bending plate 3 can bend the workpiece 25 into 90 degrees and can also bend the bending plate into acute angles smaller than 90 degrees, such as Z-shaped characters and the like, and the production is more flexible.

Preferably, the included angle between the upper bending plate 3 and the upper pressing plate 8 is 10-20 degrees. The power for pressing down the second oil cylinder 2 in the angle range is labor-saving, and the workpiece can be bent to form a common angle.

In this embodiment, a third insert 14 is disposed at the bottom of the upper bending plate 3, and a third auxiliary pressing plate 15 is disposed on a 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, an included angle between the bottom surfaces of the third insert 14 and the third auxiliary pressing plate 15 and a horizontal plane is an acute angle, and 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 0-2mm greater than the thickness of the workpiece 25 to be bent. The function of the third insert 14 is also advantageous for ease of replacement, but the provision of the third insert 14 with a tapered configuration also has the advantage of extending the life of the third insert 14. That is, when the third insert 14 is bending the workpiece 25, the contact state with the workpiece 25 is: the point-surface contact-point contact, i.e., the left end of the third insert 14, then the plane formed by the third insert 14 and the third auxiliary platen 15, and then the end of the third auxiliary platen 15, is such that the portion that is first contacted wears most, and therefore the third insert 14 and the third auxiliary platen 15 are provided in a tapered shape for increased life.

Example 4:

as shown in fig. 2, this embodiment is further optimized on the basis of embodiment 3, this embodiment focuses on explaining the improved parts compared with embodiment 1, and the same parts are not repeated, in this embodiment, the lower bending plate assembly includes a third oil cylinder 11, a third sliding block 12, a lower bending plate 10 and a lower rail fixing seat 26, the third oil cylinder 11 is fixed at the lower part of the rack 1, the lower rail fixing seat 26 is fixed on the inner wall of the lower part of the feed port 22 of the rack 1, the third sliding block 12 is fixed at one side of the lower bending plate 10 close to the lower rail fixing seat 26, an inclined plane is arranged at one side of the lower rail fixing seat 26 close to the lower bending plate 10, the third sliding block 12 is slidably connected to the inclined plane, and an included angle between the inclined plane and the vertical line is an acute angle. The advantage of the board 10 slope setting of bending down on the inclined plane of track fixing base is, when the board 10 of bending down is linear motion on the inclined plane under the effect of third hydro-cylinder 11, the motion of board 10 of bending down on the inclined plane can fall into vertical ascending motion and the motion of level to the right, consequently the board 10 of bending down not only can bend into 90 with work piece 25, can also bend into the board of bending and be less than 90 acute angle, for example Z style of calligraphy etc. for production is more nimble.

In this embodiment, a fourth insert 20 is disposed on the top of the lower bending plate 10, a bending surface 21 is milled on the fourth insert 20, an included angle between the bending surface 21 and a horizontal line is an acute angle, and when a right end of the bending surface 21 moves to be flush with a left end of the first auxiliary pressing plate 17, a distance between a right end of the bending surface 21 and the left end of the first auxiliary pressing plate 17 is 0-2mm greater than a thickness of the workpiece 25 to be bent. This thickness is sufficient for bending most sheet workpieces 25, and if the thickness increases, the matching inserts can be replaced, and the bending principle is unchanged. The fourth insert 20 has the advantages that in addition to the convenience of replacement and cost saving with the first insert 16, the bending surface 21 arranged on the fourth insert can ensure that the right end part of the bending surface 21 of the fourth insert 20 at the bending position of the workpiece 25 is close to when the lower bending plate 10 is firstly contacted with the workpiece 25, so that the precision and the bending quality of the bending part can be ensured conveniently.

Example 5:

as shown in fig. 2, this embodiment is further optimized based on embodiment 4, and this embodiment focuses on the improvement compared to embodiment 1, and the details of the same are not repeated, in this embodiment, 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 ° to 20 °; preferably 15. The included angle between the inclined plane and the vertical line is 10-20 degrees; preferably 15. The included angle between the bending surface 21 and the horizontal line is 10-20 degrees; preferably 15.

The upper rail fixing seat 6 and the upper pressing plate 8 can move up and down relatively under the driving of the first oil cylinder 5 through the first sliding block 7; the upper pressing plate 8 is connected with the upper bending plate 3 through a second sliding block 9. When the upper pressing plate 8 is pressed to a bottom dead center under the action of the first oil cylinder 5 to tightly press the workpiece 25 and needs to be bent downwards, the upper bending plate 3 starts to move, the power for moving the upper bending plate is realized by pushing the upper bending plate 3 by the second oil cylinder 2, otherwise, the second oil cylinder 2 is withdrawn to drive the upper bending plate 3 to return to the original position; the lower bending plate 10 is connected with the lower track fixing seat through a third sliding block 12, when the upper pressing plate 8 presses a lower dead point and needs to be bent upwards, the lower bending plate 10 starts to move, power for moving the lower bending plate comes from the third oil cylinder 11 to push the lower bending plate 10 to achieve, and otherwise, the third oil cylinder 11 is retracted to drive the lower bending plate 10 to return to the original position.

Taking a Z-shaped bend as an example, a thin plate workpiece 25 is fed onto a bending table 13 through a numerical control clamp, an upper pressing plate 8 is pressed to a bottom dead center through a first oil cylinder 5 power mechanism, an upper bending plate 3 is pressed downwards through a second oil cylinder 2 to be bent into a first 90-degree bend, and the upper bending plate 3 and the upper pressing plate 8 return to original positions simultaneously; the thin plate workpiece 25 is sent to the bending table 13 again through the numerical control clamp for a certain (bending) distance, the upper pressing plate 8 is repeatedly pressed to a bottom dead center, the lower bending plate 10 is ejected upwards at an angle of 15 degrees along the vertical direction through the third oil cylinder 11, the second 90-degree bending is completed, and the lower bending plate 10 and the upper pressing plate 8 return to the original positions at the same time; and bending the whole Z-shaped door plate. At this time, the Z-shaped workpiece 25 is bent at two 90 degrees, and the finished product is shown in FIG. 5. If two acute-angle bends are needed, when the upper bending plate 3 moves linearly on the inclined plane of the track under the action of the second oil cylinder 2, the movement of the upper bending plate 3 on the inclined plane of the track can be divided into vertical downward movement and horizontal rightward movement, so that the upper bending plate 3 is pressed downwards through the second oil cylinder 2, and after a first 90-degree bend is formed, the upper bending plate continues to move downwards for a distance from one end below the track, and the workpiece 25 is bent downwards to form a desired acute angle; then the upper bending plate 3 returns;

the lower bending plate 10 is ejected upwards by 15 degrees along the vertical direction through the third oil cylinder 11, and after the second 90-degree bending is completed, the lower bending plate is ejected upwards by a certain distance, so that the workpiece 25 is bent upwards to form a desired acute angle, and a finished product is as shown in fig. 6.

Taking U-shaped bending as an example, a thin plate workpiece 25 is fed onto a bending table 13 through a numerical control clamp, an upper pressing plate 8 is pressed to a lower dead point through the action of a first oil cylinder 5 and a first sliding rail, after the workpiece 25 is pressed, a lower bending plate 10 is upwards ejected out through a third oil cylinder 11 along the vertical direction at an angle of 15 degrees, the first 90-degree bending is completed, and the lower bending plate 10 and the upper pressing plate 8 return to the original positions at the same time; the thin plate workpiece 25 is sent to the bending table 13 again for a certain (bending) distance through the numerical control clamp, the actions are repeated, the second 90-degree bending is completed, and then the lower bending plate 10 and the upper pressing plate 8 return to the original positions at the same time; bending the whole U-shaped door plate; the final product is shown in fig. 4.

Compared with the traditional 90-degree bending mode, the bending mode does not lift the plate, and the Z-shaped bending mode does not need to turn over the plate.

Meanwhile, the first insert 16, the second insert 19, the third insert 14 and the fourth insert 20 are provided to adjust and replace the corresponding inserts according to the thickness of the workpiece 25 to be bent, and to adjust the distance between the inserts to meet the requirement of bending the workpiece 25, and the bending principle is not changed.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The door plate bending machine comprises a frame (1), wherein a feeding hole (22) is formed in one side of the frame (1), and the door plate bending machine is characterized in that a bending table (13) is arranged on the frame (1) at the position of the feeding hole (22), an upper pressing plate assembly used for fixing a workpiece (25) is arranged in a bending machine on the upper portion of the bending table (13) in a sliding mode, an upper bending plate assembly used for bending the workpiece (25) is arranged on one side of the upper pressing plate assembly, and a lower bending plate assembly used for bending the workpiece (25) is arranged in a bending machine on the lower portion of the bending table.

2. The door panel bending machine according to claim 1, wherein the upper pressing plate assembly comprises a first oil cylinder (5), an upper rail fixing seat (6), an upper pressing plate (8) and a first sliding block (7), the first oil cylinder (5) is fixed on the upper portion of the frame (1), the telescopic end of the first oil cylinder (5) is fixed on the upper pressing plate (8), the upper rail fixing seat (6) is fixed on the inner wall of the upper portion of the feeding port (22) of the frame (1), the first sliding block (7) is fixed on one side, close to the upper rail fixing seat (6), of the upper pressing plate (8), and the first sliding block (7) is connected to the upper rail fixing seat (6) in a sliding mode.

3. Door plate bending machine according to claim 2, wherein the bottom of said upper platen (8) is provided with a first insert (16), said first insert (16) being provided with a first auxiliary platen (17) on the side facing the upper platen assembly; and a second insert (19) is arranged on the bending table (13), and a second auxiliary pressing plate (18) is arranged on one side, facing the downward bending plate assembly, of the second insert (19).

4. Door plate bending machine according to claim 3, wherein said first insert (16) is integral with a first auxiliary pressure plate (17), and said second insert (19) is integral with a second auxiliary pressure plate (18); the bottom surfaces of the first insert (16) and the first auxiliary pressure plate (17) and the top surfaces of the second insert (19) and the second auxiliary pressure plate (18) are level and are all horizontal surfaces; and the first insert (16) and the second insert (19) as well as the first auxiliary pressure plate (17) and the second auxiliary pressure plate (18) are arranged oppositely and have the same width.

5. The door panel bending machine according to any one of claims 1 to 4, wherein the upper bending plate assembly comprises a second oil cylinder (2), an upper bending plate (3), a connecting block (4) and a second sliding block (9), the second oil cylinder (2) is fixed on the upper portion of the machine frame (1), the upper bending plate (3) is obliquely arranged, an included 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), the other end of the connecting block (4) is provided with a track inclined plane, the track inclined plane is slidably connected with the second sliding block (9), and the second sliding block (9) is fixed on one side, close to the connecting block (4), of the upper pressing plate (8).

6. Door plate bending machine according to claim 5, characterized in that the angle between said upper bending plate (3) and upper press plate (8) is between 10 ° and 20 °.

7. Door plate bending machine according to claim 6, characterized in that the bottom of said upper bending plate (3) is provided with a third insert (14), said third insert (14) being provided with a third auxiliary pressure plate (15) on the side facing the upper pressure 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, an included angle between the bottom surfaces of the third insert (14) and the third auxiliary pressing plate (15) and a horizontal plane is an acute angle, and 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 0-2mm greater than the thickness of a workpiece (25) to be bent.

8. The door panel bending machine according to claim 7, wherein the lower bending plate assembly comprises a third oil cylinder (11), a third sliding block (12), a lower bending plate (10) and a lower rail fixing seat (26), the third oil cylinder (11) is fixed to the lower portion of the rack (1), the lower rail fixing seat is fixed to the inner wall of the lower portion of the feed port (22) of the rack (1), the third sliding block (12) is fixed to one side, close to the lower rail fixing seat (26), of the lower bending plate (10), an inclined plane is arranged on one side, close to the lower bending plate (10), of the lower rail fixing seat (26), the third sliding block (12) is connected to the inclined plane in a sliding mode, and an included angle between the inclined plane and a vertical line is an acute angle.

9. The door plate bending machine according to claim 8, wherein a fourth insert (20) is arranged 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 0-2mm more than the thickness of a workpiece (25) to be bent.

10. Door plate bending machine according to claim 9, wherein the bottom surfaces of said third insert (14) and third auxiliary pressure plate (15) have an angle of 10 ° to 20 ° with the horizontal plane; the included angle between the inclined plane and the vertical line is 10-20 degrees; the included angle between the bending surface (21) and the horizontal line is 10-20 degrees.