Large-size workpiece bending device and bending method

Abstract

The invention discloses a large-size workpiece bending device and method, the large-size workpiece bending device comprises an upper die, a lower die and a supporting assembly, and the supporting assembly can support or break away from the suspended part, not supported by the lower die, of a workpiece. The part, suspended outside the lower die, of the large-size workpiece is supported through the supporting assembly, joint supporting of the supporting assembly and the lower die on the workpiece can be achieved, the workpiece is placed stably, and then the bending and stamping precision of the workpiece is higher. And moreover, the supporting assembly can not support the workpiece when the workpiece is bent, so that the workpiece bending is prevented from being hindered. The bending device is simple in structure, capable of stably supporting a workpiece, capable of clamping the workpiece, separating the supporting assembly from the workpiece before bending and bending the workpiece only by controlling the upper die to move downwards or controlling the supporting assembly to act at the same time, simple in control logic, high in efficiency and low in energy consumption.

Description

Technical Field

[0001] The invention belongs to the field of workpiece bending, and in particular relates to a large-size workpiece bending device and a bending method. Background Art

[0002] The bending machine will have precision problems when stamping and bending large-sized workpieces. For example, the bottom steel plate is bent because the part that needs to be bent is too long, and only the part of the bottom steel plate that needs to be stamped is supported by the mold. The part that needs to be bent is located outside the mold and is suspended in the air and cannot be supported, resulting in unstable placement of the entire workpiece. The deviation is too large during bending, resulting in low precision of the workpiece, affecting its use.

[0003] Chinese patent application number CN2020227823889 discloses a high-precision bending machine, but its structure is complex.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a large-size workpiece bending device and a bending method, which have simple equipment and simple method, can provide sufficient support for large-size workpieces without affecting the bending of the workpieces.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0007] A large-size workpiece bending device comprises an upper die, a lower die and a supporting assembly, wherein the supporting assembly can support or detach a suspended portion of the workpiece that is not supported by the lower die.

[0008] By supporting the part of the large-sized workpiece suspended outside the lower die through the support assembly, the support assembly and the lower die can support the workpiece together, so that the workpiece is placed stably without the workpiece moving due to gravity and insufficient support, thereby making the bending and stamping accuracy of the workpiece higher. At the same time, the support assembly can detach from the workpiece and not support the workpiece when bending the workpiece, thereby avoiding obstruction to the bending of the workpiece. The support position of the workpiece by the support assembly is selected at the position where the suspended part of the workpiece not supported by the lower die is farthest from the lower die, so that the support of the workpiece can be more stable.

[0009] Furthermore, the support assembly includes a support frame, a support block and a lifting device. The support frame is provided with a sliding track. The support block can slide along the sliding track and support or not support the suspended part of the workpiece not supported by the lower mold as needed. The lifting device is elastic and is arranged on the support frame to lift the support block.

[0010] Furthermore, the sliding track extends obliquely from bottom to top and toward the direction approaching the workpiece.

[0011] Furthermore, the large-size workpiece bending device also includes an extrusion device, which is located above the support block and presses the support block downward as the upper die moves downward.

[0012] Furthermore, the pressure of the extrusion device is greater than the lifting force of the lifting device.

[0013] Furthermore, the lifting device is a lifting pin.

[0014] Furthermore, the extrusion device is a nitrogen spring.

[0015] Furthermore, the supporting assembly is a pneumatic cylinder, an oil cylinder or an electric telescopic device.

[0016] Furthermore, the support assembly supports the suspended portion of the workpiece that is not supported by the lower die at a position farthest from the lower die.

[0017] A large-size workpiece bending method utilizes the above-mentioned large-size workpiece bending device to support the suspended part of the workpiece that is not supported by the lower die through a support assembly before the upper die and the lower die clamp the workpiece, and remove the support of the workpiece by the support assembly after the upper die and the lower die clamp the workpiece and before the workpiece is bent, and the support assembly is at least moved outside the bending path that the workpiece is about to travel when the workpiece is bent.

[0018] A large-size workpiece bending method adopts the above-mentioned large-size workpiece bending device, and supports the suspended part of the workpiece not supported by the lower die through the support assembly before the upper die and the lower die clamp the workpiece. After the upper die and the lower die clamp the workpiece, the upper die continues to descend, and the extrusion device that descends with the upper die squeezes the support block to separate from the workpiece before the workpiece is bent, and the support block is at least moved outside the bending path that the workpiece is about to travel when the workpiece is bent.

[0019] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0020] The invention discloses a large-size workpiece bending device and a bending method, wherein the large-size workpiece bending device includes an upper die, a lower die and a support assembly, and the support assembly can support or detach the suspended portion of the workpiece that is not supported by the lower die. By supporting the portion of the large-size workpiece suspended outside the lower die by the support assembly, the support assembly and the lower die can jointly support the workpiece, so that the placement of the workpiece is stable, and the workpiece will not move due to gravity and insufficient support, thereby making the bending and stamping accuracy of the workpiece higher. In addition, the support assembly can not support the workpiece when the workpiece is bent, thereby avoiding obstruction to the bending of the workpiece. The structure is simple, and stable support for the workpiece can be achieved. The clamping of the workpiece, the detachment of the support assembly from the workpiece before bending, and the bending of the workpiece can be completed by only controlling the downward movement of the upper die or simultaneously controlling the descent of the support assembly. The control logic is simple, the efficiency is high, and the energy consumption is low.

[0021] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0023] Figure 1 It is a schematic diagram of a large-size workpiece bending device of the present invention, in which a workpiece is placed on a lower die and supported by a support assembly in a die-opening state;

[0024] Figure 2 It is a schematic diagram of the upper die and the lower die of the large-size workpiece bending device of the present invention clamping the workpiece;

[0025] Figure 3 It is a schematic diagram of the upper die and the lower die of the large-size workpiece bending device of the present invention clamping the workpiece, and the nitrogen spring moves downward with the upper die but does not squeeze the support block;

[0026] Figure 4 It is a schematic diagram of the nitrogen spring of the large-size workpiece bending device of the present invention moving downward with the upper die to squeeze the support block away from the workpiece;

[0027] Figure 5 It is a schematic diagram of the large-size workpiece bending device of the present invention, in which the nitrogen spring moves downward with the upper die to squeeze the support block further away from the workpiece, and the folding knife contacts the workpiece to prepare for bending the workpiece;

[0028] Figure 6 It is a schematic diagram of the upper die of the large-size workpiece bending device of the present invention moving downward, the folding knife bending the workpiece, and the nitrogen spring squeezing the support block to the bottom;

[0029] Figure 7 It is a schematic diagram of the upper die of the large-size workpiece bending device of the present invention moving downward, the folding knife bending the workpiece into place, and the nitrogen spring being compressed;

[0030] Figure 8 A schematic diagram of a large-size workpiece bending device of the present invention using a cylinder installed vertically to support the workpiece;

[0031] Fig. 9 A schematic diagram of a large-size workpiece bending device of the present invention using a cylinder installed horizontally to support the workpiece;

[0032] Fig.10 It is a schematic diagram of the workpiece support position;

[0033] Fig.11Schematic diagram of the comparison of the workpiece before and after bending. The upper workpiece is before bending, and the lower workpiece is after bending.

[0034] In the figure: 1. upper die; 2. lower die; 3. workpiece; 4. support block; 5. sliding track, 6. ejector pin; 7. nitrogen spring; 8. upper folding knife; 9. lower folding knife; 10. equal height sleeve; 11. first spring; 12. second spring; 13. upper stripping plate; 14. lower stripping plate; 15. cylinder.

[0035] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only used to facilitate the description of the present invention and simplify the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Combination Figures 1 to 7As shown, the large-size workpiece bending device of the present invention includes a mold, a folding knife and a support assembly. The mold punches the workpiece 3, and the folding knife bends the workpiece 3. The mold includes an upper mold 1 and a lower mold 2. The stripping plate of the mold includes an upper stripping plate 13 in the upper mold 1 and a lower stripping plate 14 in the lower mold 2. The upper stripping plate 13 and the lower stripping plate 14 are opposite to each other. The folding knife includes an upper folding knife 8 located on the upper mold 1 and a lower folding knife 9 located on the lower mold 2. The upper folding knife 8 rises and falls with the upper mold 1. The upper folding knife 8 and the lower folding knife 9 are respectively located on both sides of the stripping plate and perform downward and upward bending on the workpiece 3. The support assembly is installed on the lower mold 2, and the support assembly can support or detach from the suspended part of the workpiece 3 that is not supported by the lower mold 2. The support assembly does not support the workpiece 3 when the upper folding knife 8 bends the workpiece 3.

[0040] By supporting the suspended part of the large-sized workpiece 3 that is not supported by the lower die 2 through the support assembly, the support assembly and the lower die 2 can jointly support the workpiece 3, so that the placement of the workpiece 3 is stable, and the workpiece 3 will not move due to gravity and insufficient support, thereby making the bending and stamping accuracy of the workpiece 3 higher. At the same time, the support assembly can be separated from the workpiece 3 when the upper folding knife 8 bends the workpiece 3, thereby avoiding obstruction to the bending of the workpiece 3. The support position of the support assembly for the workpiece 3 is selected at the position where the suspended part of the workpiece 3 that is not supported by the lower die 2 is farthest from the lower die 2, so that the support of the workpiece 3 can be more stable.

[0041] In this embodiment, combined with Figure 1-7 As shown, the support assembly includes a support frame, a support block 4 and a lifting device. The support frame is provided with a sliding track 5, along which the support block 4 can slide. The lifting device is provided on the support frame and has elasticity and lifts the support block 4. The support block 4 supports or does not support the suspended part of the workpiece 3 not supported by the lower die 2 as required. The support frame is provided on the lower die 2.

[0042] In order to ensure that the support block 4 is separated from the workpiece 3 during bending, the large-size workpiece bending device also includes an extrusion device, which is located above the support block 4 and presses the support block 4 downward as the upper die 1 moves downward. In order to ensure that the extrusion device can press the support block 4 downward, the pressure of the extrusion device is greater than the lifting force of the lifting device. In this embodiment, the lifting device is a lift pin 6. The extrusion device is a nitrogen spring 7.

[0043] When the workpiece 3 is ready for processing, the workpiece 3 is placed on the lower stripping plate 14 of the lower die 2, and the ejector pin 6 lifts the support block 4 upward from the bottom, and the support block 4 slides upward along the sliding track 5 obliquely to contact and support the suspended part of the workpiece 3. When the support block 4 needs to be separated from the workpiece 3, the extrusion device that moves downward with the upper die 1 squeezes the support block 4 and slides down along the sliding track 5. Since the lifting force of the support block 4 comes from the ejector pin 6 as a lifting device, the ejector pin 6 lifts the support block 4 based on its own spring force, and no other external force or control is required. When the extrusion device moves downward with the upper die 1 to squeeze the support block 4 away from the workpiece 3, the ejector pin 6 can be compressed, and similarly, it is only necessary to control the upper die 1 to move downward to squeeze the support block 4 away from the workpiece 3.

[0044] In order to enable the support block 4 to quickly leave the bending motion track of the workpiece 3 without hindering the bending of the workpiece 3 and improving the overall processing efficiency, the sliding track 5 extends obliquely from bottom to top and toward the direction close to the workpiece 3. Figure 1 Shown and combined Fig.11 As shown in the figure, the workpiece 3 is placed on the lower mold 2 and supported by the lower stripping plate 14 of the lower mold 2. Since the size of the workpiece 3 is larger than the size of the lower stripping plate 14 of the lower mold 2, part of the workpiece 3 is suspended outside the lower stripping plate 14 of the lower mold 2. Figure 1 In the example, the left and right sides of the workpiece 3 are partially suspended without being supported by the lower stripping plate 14 of the lower die 2. The left side of the workpiece 3 outside the support of the lower stripping plate 14 of the lower die 2 is larger than the right side, so the workpiece 3 has a tendency to tilt and fall to the left, so a support assembly is provided on the left side of the lower stripping plate 14 to support the suspended left side of the workpiece 3. The sliding track 5 provided on the support frame of the support assembly extends obliquely from bottom to top and to the right, so that when the support block 4 slides along the sliding track 5 to separate from the workpiece 3 and descend, the support block 4 can move downward and to the left, and when the workpiece 3 is bent, the bent part of the workpiece 3 is pushed by the folding knife to swing with the stripping plate edge as the axis, so the left side of the workpiece 3 has a downward and rightward movement trend when bending downward, and the support block 4 moves downward and leftward when descending along the sliding track 5 after separating from the workpiece 3. Therefore, compared with the support block 4 only moving vertically downward, the oblique sliding track 5 can make the support block 4 quickly separate from the workpiece 3 and quickly separate from the bending track of the workpiece 3, thereby improving the bending efficiency. In other embodiments, the sliding track 5 may also be arranged to extend vertically from bottom to top, as long as the support block 4 can avoid the bending track of the workpiece 3 when moving downward and does not hinder the bending of the workpiece 3.

[0045] In other embodiments, if the workpiece 3 is only suspended on the right side of the lower stripping plate 14 of the lower mold 2, or the right side portion of the workpiece 3 outside the support of the lower stripping plate 14 of the lower mold 2 is larger than the left side portion, and the workpiece 3 has a tendency to tilt and fall to the right, a support assembly can be set on the right side of the lower stripping plate 14 to support the suspended right side portion of the workpiece 3. Alternatively, if the left and right sides of the workpiece 3 outside the support of the lower stripping plate 14 of the lower mold 2 are both relatively large, and the workpiece 3 has a tendency to tilt and fall to the left and right sides, support assemblies are set on both sides of the lower stripping plate 14 to support the suspended left and right sides of the workpiece 3. Similarly, when the workpiece 3 is still suspended on the front and / or rear sides of the lower stripping plate 14 of the lower mold 2, when the workpiece 3 has a tendency to tilt and fall to the front and / or rear sides, a support assembly is set on the side of the workpiece 3 that has a tendency to tilt and fall to support the workpiece 3.

[0046] When workpiece 3 starts to be processed, Figure 2 As shown, after the upper die 1 descends to a certain position, the upper stripping plate 13 and the lower stripping plate 14 clamp the workpiece 3, and at this time the workpiece 3 is stably clamped.

[0047] like Figure 3 As shown, the upper die 1 continues to move downward, and the nitrogen spring 7 as an extrusion device installed on the upper die 1 moves downward with the upper die 1 but does not squeeze the support block 4, and the upper folding knife 8 installed on the upper die 1 also moves downward with the upper die 1 but does not contact the workpiece 3. A first spring 11 is installed above the upper stripping plate 13 to push the upper stripping plate 13 downward, and a sleeve 10 of equal height is installed in the upper die 1 to lift the upper stripping plate 13, and the sleeve 10 of equal height limits the pushing stroke of the first spring 11 on the upper stripping plate 13. Similarly, a second spring 12 is installed below the lower stripping plate 14 to push the lower stripping plate 14 upward, and a sleeve of equal height is installed to limit the pushing stroke of the second spring 12 on the lower stripping plate 14, and the elastic force of the first spring 11 is less than the elastic force of the second spring 12. Since the upper stripping plate 13 and the lower stripping plate 14 are in contact at this time, and the upper die 1 continues to move downward, the upper stripping plate 13 is squeezed by the lower die and then squeezed by the first spring 11, and the extrusion device and the upper folding knife 8 continue to move downward with the upper die 1.

[0048] like Figure 4 As shown, the upper die 1 continues to descend, and the nitrogen spring 7 installed on the upper die 1 as an extrusion device moves downward with the upper die 1 to extrude the support block 4 away from the workpiece 3. At this time, the upper folding knife 8 installed on the upper die 1 also moves downward with the upper die 1 but does not contact the workpiece 3, and the lower folding knife 9 also does not contact the workpiece 3.

[0049] like Figure 5 As shown, the upper die 1 continues to descend, and the nitrogen spring 7 moves downward with the upper die 1 to squeeze the support block 4 further away from the workpiece 3 , and the upper folding knife 8 and the lower folding knife 9 contact the workpiece 3 to prepare for bending the workpiece 3 .

[0050] like Figure 6As shown, the upper die 1 continues to move downward, the upper folding knife 8 and the lower folding knife 9 respectively bend the suspended parts on the left and right sides of the workpiece 3, and the nitrogen spring 7 squeezes the support block 4 to move downward to the bottom.

[0051] like Figure 7 As shown, the upper die 1 continues to descend, and the folding knife bends the workpiece 3 into place. Since the support block 4 has already descended to the bottom and cannot descend any further, the nitrogen spring 7 serving as an extrusion device is compressed during the descent of the upper die.

[0052] The above large-size workpiece bending device can be controlled in an integrated manner. The control device of the large-size workpiece bending device only needs to control the upper die to move downward to complete the clamping of the workpiece, the separation of the support block in the support assembly from the workpiece, and the bending of the workpiece by the folding knife. The control logic is simple, the efficiency is high, and the energy consumption is low.

[0053] In other embodiments, the support assembly is one of a cylinder, an oil cylinder or an electric telescopic device. Taking the cylinder as an example, when the large-sized workpiece 3 is placed on the lower die 2, the control device controls the cylinder 15 to support the suspended part of the workpiece 3 that is not supported by the lower die 2, so as to keep the workpiece 3 stably placed. After the upper die 1 and the lower die 2 of the mold of the large-sized workpiece bending device clamp the workpiece 3 and before the upper folding knife 8 bends the workpiece 3, the control device controls the support assembly to detach from the workpiece 3 and move to a position that does not hinder the bending of the workpiece 3, and remove the support of the support assembly to the workpiece 3. In the embodiment in which one of the cylinder 15, the oil cylinder or the electric telescopic device is used as the support assembly, the extrusion device is no longer provided, and the cylinder, the oil cylinder or the electric telescopic device can be arranged vertically or horizontally, as long as it can support the suspended part of the workpiece 3 that is not supported by the lower die 2 to achieve the stable placement of the workpiece 3. The support end of the cylinder 15, the oil cylinder or the electric telescopic device can be provided with a support block.

[0054] Regardless of which of the above support components is adopted, in order to simplify the setting of the support components, the support for the workpiece 3 can be set only at the position where the suspended part of the workpiece 3 not supported by the lower mold 2 is farthest from the lower mold 2. Figure 7-9 , support for the workpiece 3 is provided only at the edge end of the workpiece 3, such as Fig. 9 As shown in , the workpiece 3 can be supported at the front and rear sides, or at both ends of the same side of the workpiece 3, such as at both ends of the left side of the workpiece 3, as long as the workpiece 3 can be kept stably placed.

[0055] When the workpiece 3 is bent downward, the movement trajectories of different sides of the workpiece 3 are different. The sides parallel to the bending axis, such as Fig.10 The left side of the workpiece 3 in the figure has a downward arc trajectory; the side perpendicular to or intersecting the bending axis, such as Fig.10The front side or rear side of the workpiece 3 has a downward fan-shaped motion trajectory. For the side parallel to the bending axis, the support assembly can be installed vertically or horizontally by the cylinder 15, while for the side perpendicular to or intersecting the bending axis, the cylinder 15 should be installed horizontally, so that it can get out of the bending trajectory of the workpiece 3 as soon as possible to avoid hindering the bending of the workpiece 3.

[0056] The present invention also proposes a large-size workpiece bending method, which is implemented by using the large-size workpiece bending device including the support assembly and the extrusion device, wherein the support assembly includes a support frame, a support block 4 and a lifting device. The support frame is provided with a sliding track 5, the sliding track 5 extends obliquely from bottom to top and toward the direction close to the workpiece 3, the lifting device is elastic and lifts the support block 4 upward to slide along the sliding track 5, and the lifting device is installed on the support frame using a lift pin 6. The extrusion device is located above the support block 4, and extrudes the support block 4 downward with the upper die 1 to move away from the workpiece bending track. The extrusion device uses a nitrogen spring 7. In order to ensure that the extrusion device can squeeze the support block 4 downward, the pressure of the extrusion device is greater than the lifting force of the lifting device. After the upper die 1 moves downward and clamps the workpiece 3 with the lower die 2, the upper die 1 continues to move downward, and before the upper folding knife 8 moving downward with the upper die 1 contacts the workpiece 3, the extrusion device moving downward with the upper die 1 squeezes the support block 4 to separate from the workpiece 3, and the support block 4 moves to the outside of the bending path that the workpiece 3 is about to travel at least when the upper folding knife 8 bends the workpiece 3 downward. The large-size workpiece bending method of the present invention has simple control logic and is easy to operate.

[0057] The present invention also proposes another large-size workpiece bending method, which is implemented by using the large-size workpiece bending device in which the above-mentioned support assembly is one of the cylinder 15, the oil cylinder or the electric telescopic device, and no extrusion device is provided. Before the upper die 1 and the lower die 2 clamp the workpiece 3, the support assembly supports the suspended part of the workpiece 3 that is not supported by the lower die 2. After the upper die 1 and the lower die 2 clamp the workpiece 3 and before the upper folding knife 8 bends the workpiece 3 downward, the control device controls the support assembly to remove the support of the support assembly to the workpiece 3, and the support assembly moves to the outside of the bending path that the workpiece 3 is about to travel when the upper folding knife 8 bends the workpiece 3 downward. The control logic is simple and the operation is easy.

[0058] The above-mentioned movement to the outside of the bending path that the workpiece 3 is about to travel when at least the upper folding knife 8 bends the workpiece 3 downward means that the support component has moved to the outside of the bending path that the workpiece 3 is about to travel before the workpiece 3 is bent, or the support component is also moving when the workpiece 3 is bent, but there is a certain distance from the workpiece 3. Although the position of the support component at this moment is on the trajectory that the workpiece 3 is about to pass, when the workpiece 3 moves to the position where the aforementioned support component is at this moment at the next moment, the support component has left this position and will not hinder the bending of the workpiece 3.

[0059] The invention discloses a large-size workpiece bending device and a bending method, wherein the large-size workpiece bending device comprises an upper die, a lower die, an upper folding knife and a support assembly, wherein the upper folding knife rises and falls with the upper die, and the support assembly can support or detach the suspended part of the workpiece that is not supported by the lower die. By supporting the part of the large-size workpiece suspended outside the lower die by the support assembly, the support assembly and the lower die can jointly support the workpiece, so that the placement of the workpiece is stable, and the workpiece will not move due to gravity and insufficient support, thereby making the bending and stamping accuracy of the workpiece higher. In addition, the support assembly does not support the workpiece when the workpiece is bent, thereby avoiding obstruction to the bending of the workpiece. The large-size workpiece bending device has a simple structure, can achieve stable support for the workpiece, and can be controlled in an integrated manner. The control device of the large-size workpiece bending device only needs to control the upper die to move downward or simultaneously control the descent of the support assembly to complete the clamping of the workpiece, the detachment of the support assembly from the workpiece before bending, and the bending of the workpiece. The control logic is simple, the efficiency is high, and the energy consumption is low.

[0060] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. Large size workpiece bending device, characterized by: Including upper mold, lower mold and supporting components, The support assembly can support or disengage the suspended portion of the workpiece that is not supported by the lower die.

2. The large-size workpiece bending device according to claim 1 is characterized in that: The support assembly includes a support frame, a support block and a lifting device. The support frame is provided with a sliding track, and the support block can slide along the sliding track and support or not support the suspended part of the workpiece not supported by the lower die as needed. The lifting device is elastic and is arranged on the supporting frame to lift the supporting block.

3. The large-size workpiece bending device according to claim 2 is characterized in that: The sliding rail extends obliquely from bottom to top and toward a direction approaching the workpiece.

4. The large-size workpiece bending device according to claim 3 is characterized in that: The invention also comprises an extrusion device, which is located above the support block and presses the support block downward as the upper die moves downward.

5. The large-size workpiece bending device according to claim 4 is characterized in that: The pressure of the extrusion device is greater than the lifting force of the lifting device.

6. The large-size workpiece bending device according to claim 5 is characterized in that: The lifting device is a lifting pin, and the extrusion device is a nitrogen spring.

7. The large-size workpiece bending device according to claim 1 is characterized in that: The supporting assembly is a pneumatic cylinder, an oil cylinder or an electric telescopic device.

8. The large-size workpiece bending device according to any one of claims 1 to 7, characterized in that: The support assembly supports the suspended portion of the workpiece at a position farthest from the lower die.

9. A method for bending a large-size workpiece, characterized in that: Using the large-size workpiece bending device described in any one of claims 1 to 8, Before the upper die and the lower die clamp the workpiece, the suspended part of the workpiece not supported by the lower die is supported by the support assembly. After the upper die and the lower die clamp the workpiece and before the workpiece is bent, the support of the workpiece by the support assembly is removed, and the support assembly is at least moved outside the bending path that the workpiece is about to travel when the workpiece is bent.

10. A method for bending a large-size workpiece, characterized in that: A large-size workpiece bending device as described in any one of claims 4 to 6 is adopted, wherein the suspended part of the workpiece not supported by the lower die is supported by the support assembly before the upper die and the lower die clamp the workpiece, and the upper die continues to descend after the upper die and the lower die clamp the workpiece, and the extrusion device that descends with the upper die squeezes the support block to separate from the workpiece before the workpiece is bent, and the support block is at least moved outside the bending path that the workpiece is about to travel when the workpiece is bent.

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