Multilateral flexible bending center deflection compensation device

Abstract

The utility model discloses a deflection compensation device for a polygonal flexible bending center. The deflection compensation device comprises a plurality of groups of deflection compensation mechanisms which are arranged in parallel, each group of deflection compensation mechanism comprises a bearing beam, a tension bar and a tension bar telescopic driving device; the bearing beam is arranged between two bearing side plates of the rack; the tension bar is horizontally arranged, the two ends of the tension bar are directly or indirectly connected with the bearing beam and the upper panel of the rack respectively, and the tension bar can axially stretch out and draw back; and the tension bar telescopic driving device is used for driving the axial telescopic motion of the tension bar. According to the utility model, the horizontal load generated by bending can be directly balanced, and the bending force is balanced by using the compensation force. In addition, the device is simple in structure, low in cost, safe, reliable, convenient to adjust and obvious in effect. Furthermore, according to the requirement of an actual use scene, real-time dynamic adjustment can be realized, and a manual adjustment mode with lower cost can also be adopted. Due to the action of deflection compensation, the material cost can be reduced, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of sheet metal bending, in particular to a multi-sided flexible bending center deflection compensation device. Background Art

[0002] In the sheet metal manufacturing industry, bending is the most technically complex, the most difficult to control quality and the least automated process. In recent years, the sheet metal industry has an increasing demand for automated laser welding. However, the bending accuracy of existing technologies does not meet the standards and cannot meet the needs of automated laser welding in the next process, which seriously restricts the development and progress of the industry.

[0003] Bending center is a processing equipment with higher degree of automation and higher processing efficiency developed in the field of sheet metal bending processing in recent years. Its application in the sheet metal processing industry has gradually become popular. With the continuous expansion of its application sub-industries, its application in large-format thick plate processing sub-industries such as electrical cabinets and anti-theft doors has also begun. As the processing format becomes larger and the plate thickness becomes thicker, the impact of its deflection deformation on precision has gradually become a pain point in the industry. In addition, after the machine tool has been working for a period of time, the wear of the mold will also affect the processing accuracy, and the accuracy needs to be adjusted through deflection compensation.

[0004] like Figure 1 As shown, when the plate is bent, the upper press knife will bend and deform due to the horizontal load. The main reason for the deflection of the machine tool is the different stiffness of the upper panel of the frame along the direction of the upper press knife tip. Specifically, the stiffness of the connection positions between the two ends of the upper panel of the frame and the side panels is relatively strong, while the stiffness of the middle position of the upper panel of the frame is relatively weak due to the lack of structural support. Therefore, under the action of the horizontally distributed load on the knife tip, deflection deformation is inevitable, showing a large deformation in the middle and a small deformation on both sides. The deformation cloud diagram of the upper press knife under the horizontal bending load is shown in the figure below. Figure 2 As shown, it can be clearly seen that the bending deformation caused by the upper pressing knife will seriously affect the bending accuracy.

[0005] The Chinese utility model patent application with publication number CN212168753U and utility model name “A bending machine folding knife curvature adjustment mechanism” and the Chinese utility model patent application with publication number CN216226306U and utility model name “A bending machine multi-faceted linkage disturbance automatic compensation mechanism” can improve the influence of the above-mentioned deflection deformation on the accuracy to a certain extent. However, in the process of use, there are still the following problems to be solved:

[0006] 1. Both methods compensate for the deformation of the upper pressing knife by changing the curvature of the lower folding knife, that is, forcing the lower folding knife to adjust a deformed curve to fit the curve of the upper pressing knife. From the perspective of accuracy compensation, it is equivalent to using one accuracy deviation to match another accuracy deviation, and the effect is poor. For example, the angle of the bent plate does not meet the requirements, and the straightness is usually out of tolerance.

[0007] 2. CN212168753U adjusts the curvature by manually adjusting the wedge blocks, which can only be adjusted when the machine tool is installed, debugged or repaired, which is inconvenient to operate. In addition, since there are many wedge blocks, if the adjustment amount of each wedge block is inconsistent, it will also cause the wave-shaped deformation of the lower folding knife, thereby seriously affecting the processing accuracy.

[0008] 3. Although CN216226306U can realize automatic adjustment, the mechanical structure rigidity of the lower folding knife installation position is very large. In order to achieve the compensation effect, a large driving load (such as a large-sized driving motor) is required, and the cost is high, the mechanical structure is complex, and the actual use effect is poor, which means that it is difficult to obtain practical application.

[0009] In the prior art, there is also a method of increasing the material thickness of the upper panel and the upper slide plate slidably connected to the upper panel to improve the mechanical structural rigidity of the upper panel and the upper slide plate, thereby preventing the upper pressing knife located at the bottom of the upper slide plate from bending and deforming during bending. This processing method has high material cost and poor economic efficiency. In addition, once the mold is worn, it cannot be compensated. Utility Model Content

[0010] The technical problem to be solved by the utility model is to provide a multi-sided flexible bending center deflection compensation device in view of the deficiencies of the above-mentioned prior art. The multi-sided flexible bending center deflection compensation device can directly balance the horizontal load generated by bending, and use the compensation force to balance the bending force. In addition, the structure is simple, the cost is low, it is safe and reliable, the adjustment is convenient, and the effect is obvious. Furthermore, the utility model can also be adjusted dynamically in real time according to the needs of the actual use scene, and a lower-cost manual adjustment method can also be adopted. Due to the effect of deflection compensation, the utility model can appropriately reduce material costs and reduce costs.

[0011] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0012] A multi-sided flexible bending center deflection compensation device comprises n groups of deflection compensation mechanisms, wherein n≥1.

[0013] Each set of deflection compensation mechanisms comprises a load-bearing beam, a tension rod and a tension rod telescopic driving device.

[0014] The load-bearing beam is arranged between two load-bearing side plates of the frame.

[0015] The two ends of the tension rod are directly or indirectly connected to the load-bearing beam and the upper panel of the frame respectively, and the tension rod can be axially extended and retracted.

[0016] The tension rod telescopic driving device is used to drive the axial telescopic movement of the tension rod.

[0017] The tension rod telescopic drive device is installed in any of the following two ways:

[0018] Installation method 1: The tension rod telescopic drive device is installed on the load-bearing beam, the output end of the tension rod telescopic drive device is connected to the tension rod or integrated, and the other end of the tension rod is connected to the inner wall of the upper panel.

[0019] Installation method two: the tension rod telescopic drive device is installed on the inner wall of the upper panel, the output end of the tension rod telescopic drive device is connected to the tension rod or integrated, and the other end of the tension rod is connected to the load-bearing beam.

[0020] The tension rod telescopic driving device is a tension rod thread transmission mechanism, which comprises a nut, a screw rod and a rotation driving device.

[0021] The screw rod is a tension rod.

[0022] Either the nut or the lead screw is a rotating component.

[0023] The rotary drive device is used to drive the rotation of the rotating component.

[0024] When the nut is a rotating component, the rotary drive device is used to drive the rotation of the nut, and is installed in any of the following two installation methods:

[0025] Installation method 1: The rotary drive device is installed on the load-bearing beam, and its output end is connected to or integrated with the nut; the nut thread sleeve is arranged on the outer periphery of the tension rod; the tail end of the tension rod is connected to the inner wall surface of the upper panel.

[0026] Installation method 2: The rotary drive device is installed on the inner wall of the upper panel, and its output end is connected to the nut or integrated; the nut thread sleeve is arranged on the outer periphery of the tension rod; the tail end of the tension rod is connected to the load-bearing beam.

[0027] When the tension rod is a rotating component, the rotation drive device is used to drive the rotation of the tension rod, and it is installed in any of the following two installation methods:

[0028] Installation method 1: The rotary drive device is installed on the load-bearing beam, and its output end is connected to the tension rod; the nut is installed on the inner wall of the upper panel, and the coaxial threaded sleeve is arranged on the outer periphery of the tension rod.

[0029] Installation method two: the rotary drive device is installed on the inner wall of the upper panel, and its output end is connected to the tension rod; the nut is installed on the load-bearing beam, and the coaxial threaded sleeve is arranged on the outer periphery of the tension rod.

[0030] The rotary drive device is a chain transmission mechanism, a belt transmission mechanism, a gear transmission mechanism or a worm gear transmission mechanism.

[0031] The nut is a rotating component, the rotating driving device is a gear transmission mechanism, and the gear transmission mechanism includes a driving motor, a small gear and a large gear.

[0032] The large gear is connected to or integrated with the end face of the nut and is coaxially sleeved on the outer periphery of the tension rod. The inner diameter of the large gear is greater than the outer diameter of the tension rod.

[0033] The small gear is meshed with the large gear; the driving motor is used to drive the rotation of the small gear.

[0034] The nut is a rotating component, and the rotating driving device is a worm gear transmission mechanism.

[0035] The worm gear transmission mechanism comprises a second driving motor, a worm gear and a worm gear.

[0036] The turbine is connected to the nut or is integrally arranged.

[0037] The worm is meshed with the turbine and can actively rotate under the drive of the second driving motor, thereby driving the turbine and the nut to rotate synchronously.

[0038] The tension rod telescopic driving device is a wedge block driving mechanism, and the wedge block driving mechanism includes a driving motor three, an active wedge block and a bearing wedge block.

[0039] The active wedge block and the load-bearing wedge block are matched with the inclined surfaces and can slide along the inclined surfaces.

[0040] The end of the tension rod passes through the middle of the active wedge block and is connected to the bearing wedge block.

[0041] The driving motor three is used for driving the active wedge to slide.

[0042] The tension rod telescopic driving device is a cam driving mechanism, which includes a driving motor 4, a cam and a load-bearing wheel.

[0043] The cam and the load-bearing wheel are matched with a cam curve.

[0044] The end of the tension rod passes through the middle of the cam and is connected to the load-bearing wheel.

[0045] The driving motor 4 can drive the cam to rotate.

[0046] The load-bearing beam is an isosceles triangle hollow steel plate; the two bottom corner points of the load-bearing beam are respectively connected to the two load-bearing side plates; the vertex of the load-bearing beam points to the center line of the upper panel and serves as the installation point of the tension rod telescopic driving device.

[0047] The utility model has the following beneficial effects:

[0048] 1. The utility model can perform bending compensation on plates of different specifications, and can also perform bending compensation on different side lengths of the same plate.

[0049] 2. The compensation accuracy of the utility model is high, and the compensation load can directly offset the deformation of the machine tool structure caused by the bending force.

[0050] 3. The utility model has a simple structure and low cost.

[0051] 4. Due to the deflection compensation effect, the utility model can appropriately reduce the cost of the upper panel material and reduce the cost.

[0052] 5. The utility model has a self-locking function, which is stable and reliable. For the tension rod thread transmission mechanism, self-locking can be achieved when the helix angle is small; for the wedge block drive mechanism, it also has a self-locking function when the angle of the inclined surface is small (such as about 5 degrees); for the worm gear transmission mechanism, it also has a self-locking function.

[0053] 6. The utility model has a large compensation force, such as the thread pair, worm gear, wedge block and cam mechanism all have a large force amplification function. Therefore, a large compensation force can be achieved with a small driving power.

[0054] 7. If the machine tool is equipped with grating ruler, vision and other detection devices, the precision deviation or elastic deformation of the machine tool during the bending process can be detected in real time. Then the control system can perform real-time closed-loop control according to the detected deviation value, and truly realize closed-loop high-precision adjustment of the precision during the processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 A schematic diagram showing the prior art of using a bending center mainframe to bend a sheet metal.

[0056] Figure 2 The deformation cloud diagram of the upper pressing blade of the prior art under the horizontal bending load is shown.

[0057] Figure 3 The three-dimensional structure of a multi-sided flexible bending center deflection compensation device of the utility model is shown. Figure 1 .

[0058] Figure 4 The three-dimensional structure of a multi-sided flexible bending center deflection compensation device of the utility model is shown. Figure 2 .

[0059] Figure 5 Shows the three-dimensional structure of the frame in the utility model Figure 1 .

[0060] Figure 6 Shows the three-dimensional structure of the frame in the utility model Figure 2 .

[0061] Figure 7 The three-dimensional structure diagram of the utility model when two sets of deflection compensation mechanisms are provided is shown.

[0062] Figure 8 The three-dimensional structure diagram of the embodiment 1 of the tension rod thread transmission mechanism of the utility model is shown.

[0063] Fig. 9 The three-dimensional structure diagram of the embodiment 2 of the tension rod thread transmission mechanism of the utility model is shown.

[0064] Fig.10 A partial cross-sectional three-dimensional structural diagram of Example 2 of the tension rod thread transmission mechanism of the utility model is shown.

[0065] Fig.11 The partial cross-sectional three-dimensional structure of the wedge block driving mechanism in the utility model is shown. Figure 1 .

[0066] Fig.12 The partial cross-sectional three-dimensional structure of the wedge block driving mechanism in the utility model is shown. Figure 2 .

[0067] Fig.13 A three-dimensional front view of the wedge block driving mechanism of the utility model is shown.

[0068] Fig.14 A three-dimensional front view of the cam drive mechanism of the utility model is shown.

[0069] Fig.15 A partial cross-sectional three-dimensional structural diagram of the cam drive mechanism of the utility model is shown.

[0070] Fig.16 The deformation nephogram of the upper pressing blade without compensation in the prior art is shown.

[0071] Fig.17 The deformation curve of the upper pressing blade without compensation in the prior art is shown.

[0072] Fig.18 The deformation cloud diagram of the upper pressing knife after the deflection compensation is performed by adopting the utility model is shown.

[0073] Fig.19The deformation curve of the upper pressing knife after the deflection compensation is performed by adopting the utility model is shown.

[0074] Fig. 20 The schematic diagram of the fourth embodiment of the utility model is shown when the tension rod telescopic driving device is a manual driving device.

[0075] Fig.21 The schematic diagram of the fifth embodiment of the utility model is shown when the tension rod telescopic driving device is a manual driving device.

[0076] Among them are:

[0077] 100. Bending center host;

[0078] 110. Frame; 111. Load-bearing side panel; 112. Upper panel; 113. Lower panel;

[0079] 120. Upper slide block; 130. Folding knife; 140. Upper pressing knife; 150. Lower pressing knife;

[0080] 200. deflection compensation mechanism; 210. tension rod; 220. tension rod telescopic driving device; 230. load-bearing beam;

[0081] 300. Plates;

[0082] 410. Driving motor 1; 420. Small gear; 430. Large gear; 440. Nut; 450. Driving seat 1;

[0083] 510. Driving motor 2; 520. Worm; 530. Turbine; 540. Driving seat 2;

[0084] 610. Driving motor three; 620. Load-bearing wedge; 630. Active wedge; 640. Waist-shaped hole one; 650. Wedge nut; 660. Wedge screw;

[0085] 710. Drive motor 4; 720. Cam; 730. Loading wheel; 740. Waist-shaped hole 2;

[0086] 810. Manual adjustment nut; 820. Manual adjustment bolt. DETAILED DESCRIPTION

[0087] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.

[0088] In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second", etc. do not indicate the importance of the components, and therefore cannot be understood as a limitation on the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the scope of protection of the present invention.

[0089] like Figure 3 and Figure 4 As shown, a multi-sided flexible bending center deflection compensation device includes a bending center main unit 100 and n groups of parallel arranged deflection compensation mechanisms 200; wherein n≥1.

[0090] like Figure 3 As shown, the bending center mainframe 100 includes a frame 110 , an upper slider 120 , a folding knife 130 , an upper pressing knife 140 and a lower pressing knife 150 .

[0091] like Figure 5 and Figure 6 As shown, the frame includes two load-bearing side panels 111 , an upper panel 112 and a lower panel 113 .

[0092] The two load-bearing side plates 111 are preferably arranged in parallel.

[0093] The upper panel is arranged on the front top of the two bearing side panels and is used for slidingly installing an upper slider. An upper pressing knife is arranged at the bottom of the upper slider; the upper slider drives the upper pressing knife to move linearly in the vertical direction.

[0094] The lower panel is arranged at the front bottom of the two bearing side panels, and a lower pressing knife is arranged at the top of the lower panel. The lower pressing knife and the upper pressing knife cooperate with each other to press the plate 300 to be bent.

[0095] The deflection compensation mechanism can be one group, or two or more groups. Figure 7 The schematic diagram of the structure when two groups of deflection compensation mechanisms are set is shown. The number of groups of deflection compensation mechanisms is selected according to the width of the plate to be bent and the load borne by the upper panel; the larger the width of the plate to be bent and the greater the load borne by the upper panel, the more groups n of deflection compensation mechanisms will be.

[0096] When n≥2 and the deflection compensation mechanism is located on the same layer, not only can the deformation of the upper press tool be smaller, but also the curve of the upper press tool after compensation can be smoother, that is, the deformation curve is smoother and closer to a straight line. Usually, the compensation load in the middle is larger and the loads on both sides are smaller, which is related to factors such as the rigidity of the machine tool, the position of the upper slider guide mechanism, and the position of the compensation force application point.

[0097] When n≥2 and the deflection compensation mechanism is set up in two layers, the "upward push and downward pull" method can be adopted to achieve better accuracy. Among them, "upward push and downward pull" means: the tension rods of the deflection compensation mechanism located in the upper layer are all extended, that is, a forward thrust is formed on the upper panel; the tension rods of the deflection compensation mechanism located in the lower layer are all retracted, that is, a backward pulling force is formed on the upper panel.

[0098] like Figure 4 As shown, each set of deflection compensation mechanisms includes a tension rod 210 , a tension rod telescopic driving device 220 and a load-bearing beam 230 .

[0099] The load-bearing beam is arranged between two load-bearing side plates of the frame and is used to transmit the deflection compensation load to the frame.

[0100] The load-bearing beam is preferably, but not limited to, an isosceles triangular hollow steel plate; the two bottom corners of the load-bearing beam are respectively connected to the two load-bearing side plates; the vertex of the load-bearing beam points to the center line of the upper panel and serves as the installation point of the tension rod telescopic drive device. The advantage of this arrangement is that the internal stress of the material of the load-bearing beam is mainly axial tension, the three sides of the triangle are all subjected to axial force, and the two load-bearing side plates of the frame are subjected to very little buckling load, which does not affect the stability of the frame. Changing the load-bearing beam to a flat steel plate or a steel wire rope and other shapes has the same function and is considered equivalent.

[0101] The tension rod is preferably but not limited to being arranged horizontally, and both ends of the tension rod are directly or indirectly connected to the load-bearing beam and the upper panel of the frame respectively, and the tension rod can be axially retracted.

[0102] The tension rod telescopic drive device is used to drive the axial telescopic movement of the tension rod, change the distance between the load-bearing beam and the upper panel, balance the horizontal load generated during the bending process, and thus achieve the purpose of deflection deformation compensation.

[0103] The axial expansion and contraction of the tension rod refers specifically to the axial tension or axial compression of the tension rod. Depending on the working conditions, there may be three specific situations:

[0104] 1. The tension rod realizes single axial tension.

[0105] 2. The tension rod realizes single axial compression.

[0106] 3. The tension rod can achieve both axial tension and axial compression.

[0107] The tension rod driving device capable of realizing the above three situations is collectively referred to as a tension rod telescopic driving device.

[0108] The tension rod telescopic drive device is installed in any of the following two ways:

[0109] Installation method 1: The tension rod telescopic drive device is installed on the load-bearing beam, the output end of the tension rod telescopic drive device is connected to the tension rod, and the other end of the tension rod is connected to the inner wall of the upper panel. At this time, adjustment, debugging and maintenance are more convenient.

[0110] Installation method 2: The tension rod telescopic drive device is installed on the inner wall of the upper panel, the output end of the tension rod telescopic drive device is connected to the tension rod, and the other end of the tension rod is connected to the load-bearing beam. In this case, the processing and manufacturing difficulty is low.

[0111] The tension rod telescopic driving device of the utility model has the following three preferred embodiments.

[0112] Embodiment 1

[0113] The tension rod telescopic driving device is a tension rod thread transmission mechanism, which comprises a nut, a screw rod and a rotation driving device.

[0114] The screw rod is a tension rod.

[0115] Either the nut or the lead screw is a rotating component.

[0116] The rotary drive device is used to drive the rotation of the rotating component.

[0117] When the nut is a rotating component, the rotary drive device is used to drive the rotation of the nut, and is installed in any of the following two installation methods:

[0118] Installation method 1: The rotary drive device is installed on the load-bearing beam, and its output end is connected to the nut or integrated; the nut thread sleeve is set on the outer periphery of the tension rod; the tail end of the tension rod is connected to the inner wall of the upper panel. In this case, adjustment, debugging and maintenance are more convenient.

[0119] Installation method 2: The rotary drive device is installed on the inner wall of the upper panel, and its output end is connected to the nut or integrated; the nut thread sleeve is set on the outer periphery of the tension rod; the tail end of the tension rod is connected to the load-bearing beam. In this case, the processing and manufacturing difficulty is low.

[0120] The nut rotates, has a stronger bearing capacity, and has low precision requirements for processing and assembly.

[0121] When the tension rod is a rotating component, the rotation drive device is used to drive the rotation of the tension rod, and it is installed in any of the following two installation methods:

[0122] Installation method 1: The rotary drive device is installed on the load-bearing beam, and its output end is connected to the tension rod or is integrally arranged; the nut is installed on the inner wall surface of the upper panel, and the coaxial thread sleeve is arranged on the outer periphery of the tension rod.

[0123] Installation method two: the rotary drive device is installed on the inner wall of the upper panel, and its output end is connected to the tension rod or is integrally arranged; the nut is installed on the load-bearing beam, and the coaxial thread sleeve is arranged on the outer periphery of the tension rod.

[0124] The screw rod rotates, and the rotary drive device has a more compact volume and a low manufacturing cost.

[0125] The above-mentioned rotation driving device is preferably but not limited to a chain transmission mechanism, a belt transmission mechanism, a gear transmission mechanism or a worm gear transmission mechanism.

[0126] Furthermore, the tension rod thread transmission mechanism in the utility model has the following two specific preferred embodiments.

[0127] Example 1

[0128] The nut is a rotating component, and the rotating driving device is a gear transmission mechanism.

[0129] As an alternative, the screw rod is used as the rotating part. Only the structural details are different, and the functions are the same, so they are considered equivalent.

[0130] like Figure 8 As shown, the gear transmission mechanism includes a driving motor 410, a small gear 420, a large gear 430, a nut 440 and a driving seat 450.

[0131] The large gear is connected to or integrated with the end face of the nut and is coaxially sleeved on the outer periphery of the tension rod. The inner diameter of the large gear is greater than the outer diameter of the tension rod.

[0132] The small gear meshes with the large gear.

[0133] The driving motor 1 is used to drive the rotation of the pinion gear, and the output end of the driving motor 1 can be directly connected to the pinion gear, or can be connected to the pinion gear through a speed reducer. In this embodiment, the driving motor 1 is preferably fixedly arranged on the driving seat 1, and the fixed seat 1 is connected to the load-bearing beam.

[0134] The gear transmission mechanism has high precision and is easy to manufacture. It can achieve precision adjustment of 1μm and has low cost. It is suitable for high-precision, low-load bending. In addition, it can also achieve push and pull bidirectional actions.

[0135] Example 2

[0136] The nut is a rotating component, and the rotating driving device is a worm gear transmission mechanism.

[0137] As an alternative, the screw rod is used as the rotating part. Only the structural details are different, and the functions are the same, so they are considered equivalent.

[0138] like Fig. 9 and Fig.10As shown, the worm gear transmission mechanism includes a second drive motor 510 , a worm 520 , a worm gear 530 and a second drive seat 540 .

[0139] The turbine is connected to the nut or is integrally arranged.

[0140] The worm is meshed with the turbine and can actively rotate under the drive of the second drive motor; the second drive motor is preferably installed on the load-bearing beam through the second drive seat.

[0141] The second driving motor rotates to drive the worm, the worm drives the turbine, the turbine drives the nut, and finally drives the axial telescopic movement of the tension rod.

[0142] The worm gear transmission mechanism has high precision and simple manufacturing, and can achieve precision adjustment of 1μm. When the helix angle of the worm gear meets the self-locking condition, the worm gear transmission mechanism can achieve self-locking, with large load capacity, which can greatly reduce the specifications of the drive motor. The disadvantage is that the manufacturing cost is high, which is suitable for high-end high-precision and heavy load, and can achieve push and pull bidirectional actions.

[0143] In addition, the above-mentioned worm gear transmission mechanism has two-stage amplification, wherein the screw nut is a first-stage force amplification with a self-locking function; the worm gear is another first-stage force amplification with a self-locking function.

[0144] Embodiment 2

[0145] The tension rod telescopic driving device is a wedge block driving mechanism.

[0146] like Figures 11 to 13 As shown, the wedge block driving mechanism includes a driving motor 3 610 , a bearing wedge block 620 and an active wedge block 630 .

[0147] The active wedge block and the bearing wedge block are matched with each other on the inclined surface, and the center of the active wedge block is preferably provided with a waist-shaped hole 640 for the tension rod to pass through. As an alternative, the waist-shaped hole 1 can also be other known shapes, which are considered equivalent if the functions are the same.

[0148] The above-mentioned inclined surface is preferably but not limited to 5°, which can achieve self-locking.

[0149] The end of the tension rod passes through the waist-shaped hole of the active wedge block and is connected to the bearing wedge block.

[0150] The driving motor three is used for driving the active wedge to slide.

[0151] The wedge block driving mechanism is self-locking, has a large load-bearing capacity, low cost, and simple manufacturing, and is suitable for heavy-load scenarios of large-format thick plates. However, its disadvantage is that it can only achieve pulling but not pushing.

[0152] The above-mentioned drive motor 3 is preferably installed through a fixed seat, and the active wedge block and the bearing wedge block are both located in the fixed seat. At least one part of the bearing wedge block and the tension rod cooperates with the fixed seat moving pair. In this embodiment, preferably both ends of the bearing wedge block cooperate with the fixed seat moving pair.

[0153] Furthermore, the driving motor three preferably drives the active wedge to move through the wedge thread pair, and the bearing wedge moves up and down along the inclined plane (that is, along the horizontal direction of the machine tool), thereby realizing the extension and retraction of the tension rod.

[0154] The wedge screw pair transmission preferably includes a wedge nut 650 and a wedge screw 660, one of which is a rotating component and the other is a fixed component. In this embodiment, the wedge nut is preferably a fixed component, which is fixedly connected or integrated with the active wedge, the wedge nut is coaxially threadedly sleeved on the outer periphery of the wedge screw 660, and the input end of the wedge screw is connected to the three-phase drive motor.

[0155] Embodiment 3

[0156] The tension rod telescopic driving device is a cam driving mechanism.

[0157] like Fig.14 and Fig.15 As shown, the cam driving mechanism includes a driving motor 710, a cam 720 and a bearing wheel 730.

[0158] The cam and the load-bearing wheel are matched with a cam curve.

[0159] The end of the tension rod passes through the waist-shaped hole 2 740 in the middle of the cam and is connected to the load-bearing wheel.

[0160] The driving motor 4 can drive the cam to rotate.

[0161] The cam driving mechanism can adjust the slope of the cam curve according to different loads / accuracies, and has greater flexibility.

[0162] Further, the drive motor 4 is connected to the cam through a cam thread transmission. The specific structure of the cam thread transmission can be found in the wedge thread pair transmission in the second embodiment, which will not be described again here.

[0163] The horizontal compensation force of the utility model directly acts on the upper panel. Since the upper panel is connected with the upper slider through the guide rail, the compensation force is equivalent to indirectly acting on the upper slider, thereby achieving the purpose of deflection compensation.

[0164] Embodiment 4

[0165] like Fig. 20As shown, the tension rod telescopic driving device is a manual driving device, that is, the driving motor is removed and pure manual adjustment is adopted. At this time, the manual driving device includes a screw rod and a manual adjustment nut 810.

[0166] The screw rod is the tension rod 210, and the manual adjustment nut is a rotating component. By manually rotating the manual adjustment nut, the axial telescopic movement of the tension rod (screw rod) can be achieved.

[0167] Embodiment 5

[0168] like Fig.21 As shown, the tension rod telescopic driving device is a manual driving device, which adopts pure manual adjustment. At this time, the manual driving device is a manual adjustment bolt 820, and in this embodiment, four parallel-arranged manual adjustment bolts are preferably used.

[0169] The front end of the tension rod is connected to the upper panel, and a gap is left between the rear end of the tension rod and the load-bearing beam.

[0170] Each manual adjusting bolt is installed on the load-bearing beam, and the threaded rod of each manual adjusting bolt is threadedly connected with the tail end of the tension rod. By manually rotating each manual adjusting bolt, the tension rod can be tightened.

[0171] Furthermore, replacing the tension rod in the scheme with a tension wire rope, etc., will be regarded as an equivalent replacement.

[0172] The utility model can perform bending compensation on plates of different specifications, and can also perform bending compensation on different side lengths of the same plate.

[0173] Furthermore, the utility model has high compensation accuracy, and can also provide feedback on the compensation amount by adding a grating ruler. The compensation load can directly offset the deformation of the machine tool structure caused by the bending force.

[0174] like Fig.16 and Fig.17 As shown, the deformation curve of the upper pressing knife without compensation in the prior art has a deformation amount of 1.035-0.781=0.254mm, and the corresponding bending accuracy deviation is about 5 degrees. Fig.17 The horizontal axis is the position along the length direction of the upper pressing knife, and the vertical axis is the deformation. The units of the horizontal and vertical axes are both mm.

[0175] The deformation cloud diagram after compensation by the utility model is as follows Fig.18 The deformation curve is shown in Fig.19As shown, the deformation after compensation is 0.743-0.698=0.045mm, and the corresponding angle deviation is 0.9 degrees. The utility model approximately constitutes a linear "force conduction" continuous structure through the drive motor-transmission mechanism-tension rod-frame upper panel-upper press knife in sequence, and the angle of motor rotation is linearly related to the deformation compensation amount of the corresponding press knife. Therefore, accurate precision compensation can be achieved. When the accuracy is reached, the bending center can be adapted to industries such as elevators, high-voltage electrical cabinets, and vacuum cabinets. In addition, due to the significant improvement in bending accuracy, the workpiece after bending can be directly laser-automatically welded. The high-precision bending of sheet metal workpieces is not only to obtain higher precision products, but more importantly, it can affect the next process. Laser automatic welding with a higher degree of automation can be used to improve the automation and intelligence level of the entire sheet metal manufacturing industry, thereby promoting the development of the industry.

[0176] The utility model provides a method for compensating central deflection of a multilateral flexible bending, which preferably comprises the following steps.

[0177] Step 1: Calculate the dynamic load of bending: Calculate the dynamic load of bending according to the material, thickness, bending length, bending radius, bending speed, mold corner radius and other process parameters of the plate. The dynamic load of bending is because the bending force in the vertical direction and the bending force in the horizontal direction are both a dynamic change process.

[0178] Step 2: Calculate the horizontal deformation load of the upper pressing tool: Based on the calculated bending dynamic load, combined with the machine tool structure stiffness, the contact stiffness of the guide mechanism, the pressure between the upper and lower dies, and the surface friction coefficient of the sheet, calculate the deformation load of the tip of the upper pressing tool in the horizontal direction.

[0179] Step 3, calculate the compensation displacement: according to the positional relationship between the upper panel and the upper pressing knife on the fuselage and the structural rigidity, calculate the compensation displacement required for the corresponding position of the upper panel.

[0180] Step 4, calculate the axial expansion and contraction displacement of the tension rod: according to the calculated compensation displacement and the stiffness of the tension rod (the tension rod will also produce elastic deformation under the action of the compensation load), calculate the required axial expansion and contraction displacement of the tension rod.

[0181] Step 5, calculate the rotation angle of the drive motor: According to the axial expansion and contraction displacement of the tension rod and the speed ratio relationship of the drive device, calculate the required rotation angle of the drive motor to complete the entire compensation process.

[0182] Step 6: Compensation displacement detection: By setting a displacement sensor at the corresponding position of the upper panel, the compensation amount can be accurately controlled in a closed loop.

[0183] The utility model can control the compensation accuracy within 0.025mm and the bending accuracy within 0.5 degrees through the above-mentioned deflection compensation.

[0184] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A multi-sided flexible bending center deflection compensation device, characterized in that: It comprises n groups of deflection compensation mechanisms, wherein n≥1; each group of deflection compensation mechanisms comprises a load-bearing beam, a tension rod and a tension rod telescopic driving device; The load-bearing beam is arranged between two load-bearing side plates of the frame; The two ends of the tension rod are directly or indirectly connected to the load-bearing beam and the upper panel of the frame respectively, and the tension rod can be axially extended and retracted; The tension rod telescopic driving device is used to drive the axial telescopic movement of the tension rod.

2. The multi-sided flexible bending center deflection compensation device according to claim 1, characterized in that: The tension rod telescopic drive device is installed in any of the following two ways: Installation method 1: The tension rod telescopic drive device is installed on the load-bearing beam, the output end of the tension rod telescopic drive device is connected to the tension rod or integrated, and the other end of the tension rod is connected to the inner wall surface of the upper panel; Installation method two: the tension rod telescopic drive device is installed on the inner wall of the upper panel, the output end of the tension rod telescopic drive device is connected to the tension rod or integrated, and the other end of the tension rod is connected to the load-bearing beam.

3. The multi-sided flexible bending center deflection compensation device according to claim 2, characterized in that: The tension rod telescopic driving device is a tension rod thread transmission mechanism, including a nut, a screw rod and a rotation driving device; The screw rod is a tension rod; Either the nut or the screw is a rotating part; The rotary drive device is used to drive the rotation of the rotating component.

4. The multi-sided flexible bending center deflection compensation device according to claim 3 is characterized in that: When the nut is a rotating component, the rotary drive device is used to drive the rotation of the nut, and it is installed in any of the following two installation methods: Installation method 1: The rotary drive device is installed on the load-bearing beam, and its output end is connected to the nut or integrated; the nut thread sleeve is arranged on the outer periphery of the tension rod; the tail end of the tension rod is connected to the inner wall surface of the upper panel; Installation method 2: The rotary drive device is installed on the inner wall of the upper panel, and its output end is connected to the nut or integrated; the nut thread sleeve is set on the outer periphery of the tension rod; the tail end of the tension rod is connected to the load-bearing beam; When the tension rod is a rotating component, the rotation drive device is used to drive the rotation of the tension rod, and it is installed in any of the following two installation methods: Installation method 1: The rotary drive device is installed on the load-bearing beam, and its output end is connected to the tension rod; the nut is installed on the inner wall of the upper panel, and the coaxial thread sleeve is arranged on the outer periphery of the tension rod; Installation method two: the rotary drive device is installed on the inner wall of the upper panel, and its output end is connected to the tension rod; the nut is installed on the load-bearing beam, and the coaxial threaded sleeve is arranged on the outer periphery of the tension rod.

5. The multi-sided flexible bending center deflection compensation device according to claim 4, characterized in that: The rotary drive device is a chain transmission mechanism, a belt transmission mechanism, a gear transmission mechanism or a worm gear transmission mechanism.

6. The multi-sided flexible bending center deflection compensation device according to claim 5, characterized in that: The nut is a rotating component, the rotating driving device is a gear transmission mechanism, and the gear transmission mechanism includes a driving motor, a small gear and a large gear; The large gear is connected to or integrated with the end face of the nut and is coaxially sleeved on the outer periphery of the tension rod. The inner diameter of the large gear is larger than the outer diameter of the tension rod. The small gear is meshed with the large gear; the driving motor is used to drive the rotation of the small gear.

7. The multi-sided flexible bending center deflection compensation device according to claim 5, characterized in that: The nut is a rotating component, and the rotating drive device is a worm gear transmission mechanism; The worm gear transmission mechanism comprises a second driving motor, a worm gear and a worm gear; The turbine is connected to or integrated with the nut; The worm is meshed with the turbine and can rotate actively under the drive of the second driving motor, thereby driving the turbine and the nut to rotate synchronously.

8. The multi-sided flexible bending center deflection compensation device according to claim 2, characterized in that: The tension rod telescopic drive device is a wedge block drive mechanism, and the wedge block drive mechanism includes a drive motor 3, an active wedge block and a bearing wedge block; The active wedge block and the load-bearing wedge block are matched with the inclined surfaces and can slide along the inclined surfaces; The end of the tension rod passes through the middle of the active wedge and is connected to the bearing wedge; The driving motor three is used for driving the active wedge to slide.

9. The multi-sided flexible bending center deflection compensation device according to claim 2, characterized in that: The tension rod telescopic driving device is a cam driving mechanism, which includes a driving motor 4, a cam and a load-bearing wheel; The cam and the load wheel are matched with a cam curve; The end of the tension rod passes through the middle of the cam and is connected to the load-bearing wheel; The driving motor 4 can drive the cam to rotate.

10. The multi-sided flexible bending center deflection compensation device according to claim 1, characterized in that: The load-bearing beam is an isosceles triangle hollow steel plate; the two bottom corner points of the load-bearing beam are respectively connected to the two load-bearing side plates; the vertex of the load-bearing beam points to the center line of the upper panel and serves as the installation point of the tension rod telescopic driving device.

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