A multi-degree-of-freedom bending device for processing automobile exterior parts

Abstract

The present invention relates to the technical field of drawing and bending machines, and in particular to a multi-degree-of-freedom drawing and bending device for processing automobile exterior trim, comprising a table and a mold, wherein two ends of the table are symmetrically rotatably connected to two drawing and bending arms, and two rolling devices are symmetrically arranged at the upper middle section of the table; the rolling device comprises a column fixed to the upper side of the table, and three rotating arms are rotatably connected to the outer side of the column, and one end of each of the three rotating arms is movably provided with a rolling shaft. The present invention can roll from the middle section of the workpiece to both ends in sequence through the cooperation of two rolling devices, and apply a certain pressure to the position of the workpiece where the drawing and bending deformation occurs, so that the position of the drawing and bending deformation can always fit on the curved side of the mold, which can effectively avoid the warping of the middle section, greatly improving the drawing and bending forming quality of the workpiece, and applying multi-point pressure to the bending deformation of the workpiece can well prevent the workpiece from rebounding after the thrust is removed at both ends of the workpiece.

Description

Technical Field

[0001] The invention relates to the technical field of stretch-bending machines, and in particular to a multi-degree-of-freedom stretch-bending device for processing automobile exterior trims. Background Art

[0002] The stretch-bending machine is used to bend long strips of workpieces into shapes with different curvatures. Rotating arms are hinged on both sides of the base of the stretch-bending machine. The two rotating arms rotate synchronously in opposite directions, applying thrust from both ends of the workpiece to make the long strip of workpiece fit onto one side of the mold in the middle section, thereby bending the long strip of workpiece into a shape similar to the curved side of the mold.

[0003] In the production of auto parts, a large number of auto exterior parts need to be manufactured through a stretch-bending process, such as the longitudinal beams of an off-road vehicle roof rack, the curvature of which needs to match the curvature of the roof.

[0004] After searching, a Chinese patent with publication number: CN116713354A discloses a sheet metal bending machine for automobile door and window frames, including: a bending machine base, a convex mold, a bending arm, an oil pipe fixing device, and a driving device. It is characterized in that the bending machine base structure is a rectangular parallelepiped, the convex mold is installed on the upper surface of the bending machine base, the driving device is installed on the opposite side of the convex mold, bending arms are installed at both ends of the driving device, oil pipes are arranged on the surface of the bending arm, the tension arm is provided with an oil drain outlet, and the oil pipe fixing device is installed and fixed on the tension arm.

[0005] Based on the above search and combined with the actual problem, it is found that when the existing bending machine bends the luggage rack longitudinal beam, because the luggage rack longitudinal beam includes multiple arcs of different curvatures, not a single arc shape, during bending, the workpiece cannot be fully fitted with the curved surfaces of different curvatures on the mold, especially causing the middle section of the workpiece to bulge outwards, such as Fig. 9 The state shown cannot completely fit with the curved surface side of the mold, thus affecting the stretch-bending processing quality of the luggage rack longitudinal beam. Summary of the invention

[0006] The object of the present invention is to provide a multi-degree-of-freedom bending device for processing automobile exterior parts to solve the problems raised in the above-mentioned background technology.

[0007] The technical solution of the present invention is: a multi-degree-of-freedom bending device for processing automobile exterior trim, comprising a table and a mold, two ends of the table are symmetrically rotatably connected to two bending arms, and two rolling devices are symmetrically arranged at the middle section of the upper side of the table; the rolling device comprises a column fixed to the upper side of the table, the outer side of the column is rotatably connected to three rotating arms, one end of the three rotating arms is movably provided with a rolling shaft, and the upper side of the table is provided with a differential drive mechanism for driving the three rotating arms to rotate at unequal speeds; the differential drive mechanism comprises three semicircular worm gears fixed to the other ends of the three rotating arms, two vertical plate brackets fixed to the upper side of the table, three worms respectively meshing with the three semicircular worm gears are rotatably connected between the two vertical plate brackets, one end of the three worms is fixed with driven bevel gears with different numbers of teeth, and a transmission structure is arranged between the three driven bevel gears.

[0008] Preferably, the transmission structure includes a gear shaft that is rotatably connected to the positions of the three driven bevel gears on the table, and a driving bevel gear with an equal number of teeth is fixed on the outer side of the gear shaft at the position corresponding to each driven bevel gear. The three driving bevel gears are respectively meshed with the three driven bevel gears, and the number of teeth of the three driven bevel gears decreases from top to bottom.

[0009] Preferably, a linkage mechanism that can drive the gear shaft to rotate is respectively arranged between the two gear shafts and the two bending arms, and the linkage mechanism includes a driven pulley fixed at the lower end of the gear shaft and a driving pulley fixed at one end of the bending arm, and the driving pulley and the driven pulley are connected by a synchronous belt drive.

[0010] Preferably, the diameter of the driving pulley is greater than the diameter of the driven pulley.

[0011] Preferably, two ends of the platform are symmetrically rotatably connected to two stretching and bending cylinders, and the telescopic ends of the two stretching and bending cylinders are respectively rotatably connected to two stretching and bending arms.

[0012] Preferably, a long groove is provided at one end of each of the rotating arms, a rolling cylinder is installed at the inner end of the long groove, a sliding frame is fixed to the telescopic end of the rolling cylinder, the sliding frame is movably connected to the inner side of the long groove, the sliding frame and the rolling shaft are movably connected through an elastic structure, and a slot for the rolling shaft to pass through is provided on the lower side of the rotating arm.

[0013] Preferably, the elastic structure includes a guide rod fixed on the inner side of the sliding frame, the outer side of the guide rod is slidably connected to an inner sliding block, one end of the inner sliding block is elastically connected to an inner end of the sliding frame via a strong coil spring, the upper end of the rolling shaft is rotatably connected to the lower side of the inner sliding block, and the outer lower end of the rolling shaft is sleeved with a rubber sleeve.

[0014] Preferably, eight sliding frame rollers arranged in a matrix are rotatably connected to the outer side of the sliding frame, and the eight sliding frame rollers are respectively rollingly connected to the upper and lower sides of the inner part of the long groove.

[0015] Preferably, a clamping cylinder is installed on the upper side of the table plate close to the curved surface of the mold, and a clamping plate is fixed to the telescopic end of the clamping cylinder.

[0016] Preferably, one end of the two bending arms is rotatably connected to a C-shaped frame, a push plate is movably provided on one side of the interior of the two C-shaped frames, a slide groove is opened on one side of the two push plates, a slide bar slidably connected to the inner side of the slide groove is fixed on the inner side of the two C-shaped frames, and two limit baffles are provided at both ends of the two push plates.

[0017] The present invention provides a multi-degree-of-freedom bending device for processing automobile exterior parts through improvement, which has the following improvements and advantages compared with the prior art:

[0018] First, the present invention uses two differential drive mechanisms. When the two bending arms rotate synchronously in opposite directions to bend the workpiece, the six rotating arms of the two rolling devices are driven to rotate and unfold synchronously from the middle section to the two ends. The six rotating arms drive the three rolling shafts to roll and separate from the middle section to the end sections of the workpiece in sequence. Therefore, when the workpiece is bent, the two rolling devices cooperate to roll from the middle section to the two ends of the workpiece in sequence, and a certain pressure is applied to the position where the workpiece is bent and deformed, so that the position where the workpiece is bent and deformed can always fit on the curved side of the mold, which can effectively avoid the warping of the middle section and greatly improve the bending quality of the workpiece. Moreover, multi-point pressure is applied to the bending deformation of the workpiece, and after the thrust is removed at both ends of the workpiece, the workpiece can be well prevented from rebounding.

[0019] Secondly, the present invention has two C-shaped frames arranged at the ends of the two bending arms and two push plates that can movably cooperate with the C-shaped frames. Since the distance between the two ends of the workpiece will change after bending, the sliding cooperation between the push plates and the C-shaped frames can prevent the workpiece surface from directly rubbing against the inner side of the C-shaped frames, thereby avoiding scratches on the workpiece surface and further improving the bending quality of the workpiece.

[0020] Third: The present invention uses two linkage mechanisms, and when the two drawing and bending arms rotate synchronously in opposite directions, the gear shafts of the two transmission structures can be driven to rotate in opposite directions at a constant speed, thereby driving the six rotating arms of the two rolling devices to rotate in opposite directions and unfold to both ends, thereby driving the six rolling shafts to roll evenly and disperse on one side of the workpiece, so that the pressure applied to one side of the workpiece is more evenly distributed, further improving the drawing and bending quality of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the present invention from a first viewing angle;

[0023] Figure 2 It is a structural schematic diagram of the sliding frame and the elastic structure in the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the second viewing angle of the present invention;

[0025] Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0026] Figure 5 It is a schematic diagram of the structure inside the rotating arm of the present invention;

[0027] Figure 6 It is a schematic diagram of the structure from a third viewing angle of the present invention;

[0028] Figure 7 For the present invention Figure 1 A schematic diagram of the enlarged structure at B in the middle;

[0029] Figure 8 It is a structural schematic diagram of the bending state of a workpiece according to the present invention;

[0030] Fig. 9 It is a structural schematic diagram of the workpiece in the background technology of the present invention when it is not fitted with a mold.

[0031] Reference numerals:

[0032] 1. Table; 2. Die; 3. Bending arm; 4. Bending cylinder; 5. C-shaped frame; 6. Push plate; 7. Slide; 8. Slide; 9. Clamping cylinder; 10. Clamping plate; 11. Limit baffle; 101. Column; 102. Rotating arm; 103. Semicircular worm gear; 104. Plate bracket; 105. Worm; 106. Driven bevel gear; 109. Gear shaft; 110. Active bevel gear; 111. Long groove; 112. Rolling cylinder; 113. Sliding frame; 114. Rolling shaft; 115. Rubber sleeve; 116. Slotting; 117. Sliding frame roller; 201. Guide rod; 202. Inner slider; 203. Strong spiral spring; 301. Active pulley; 302. Driven pulley; 303. Synchronous belt. DETAILED DESCRIPTION

[0033] The present invention is described in detail below, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention provides a multi-degree-of-freedom bending device for processing automobile exterior parts through improvement. The technical solution of the present invention is:

[0035] like Figures 1 to 9 As shown, the embodiment of the present invention provides a multi-degree-of-freedom bending device for processing automobile exterior parts, including a platform 1 and a mold 2, two ends of the platform 1 are symmetrically connected to two bending arms 3, and two rolling devices are symmetrically arranged at the middle section of the upper side of the platform 1; the rolling device includes a column 101 fixed to the upper side of the platform 1, and the outer side of the column 101 is rotatably connected to three rotating arms 102, and one end of each of the three rotating arms 102 is movably provided with a rolling shaft 114 (such as Figure 5 As shown), a differential drive mechanism is provided on the upper side of the table 1 to drive the three rotating arms 102 to rotate at unequal speeds; the differential drive mechanism includes three semicircular worm gears 103 fixed to the other ends of the three rotating arms 102, and two vertical plate brackets 104 fixed to the upper side of the table 1, and three worms 105 are rotatably connected between the two vertical plate brackets 104 and are respectively meshed with the three semicircular worm gears 103, and one end of the three worm gears 105 is fixed with driven bevel gears 106 with different numbers of teeth, and a transmission structure is provided between the three driven bevel gears 106.

[0036] Furthermore, the transmission structure includes a gear shaft 109 that is rotatably connected to the position of the three driven bevel gears 106 on the table 1, and a driving bevel gear 110 with the same number of teeth is fixed on the outer side of the gear shaft 109 at the position corresponding to each driven bevel gear 106, and the three driving bevel gears 110 are respectively meshed with the three driven bevel gears 106, and the number of teeth of the three driven bevel gears 106 decreases from top to bottom;

[0037] The gear shaft 109 of the transmission structure can drive the three active bevel gears 110 to rotate synchronously, and the number of teeth of the three driven bevel gears 106 decreases from top to bottom, so the rotation angular speeds of the three driven bevel gears 106 increase from top to bottom. Therefore, the three driven bevel gears 106 respectively drive the three worm gears 105 to rotate at different angular speeds, and the rotation angular speeds of the three worm gears 105 also increase from top to bottom. Therefore, at the same time, the three worm gears 105 respectively drive the three semicircular worm wheels 103 to rotate at different angles, thereby driving the three rotating arms 102 to rotate at different angles, and the rotation angles of the three rotating arms 102 increase from top to bottom. Therefore, in the process of bending the workpiece by the two bending arms 3, the three rotating arms 102 of the rolling device can rotate and unfold synchronously, and the three rotating arms 102 respectively drive the three rolling shafts 114 to roll and separate from the middle section to the end section of the workpiece in turn, and the multiple rolling shafts 114 evenly apply pressure to one side of the workpiece (combined with Figure 8 and Fig. 9 ), improve the stretch-bending quality of the workpiece.

[0038] Furthermore, a linkage mechanism (such as a gear shaft 109) is provided between the two gear shafts 109 and the two bending arms 3 to drive the gear shaft 109 to rotate. Figure 6 As shown in the figure, the linkage mechanism includes a driven pulley 302 fixed to the lower end of the gear shaft 109 and a driving pulley 301 fixed to one end of the bending arm 3. The driving pulley 301 and the driven pulley 302 are connected by a synchronous belt 303. The diameter of the driving pulley 301 is larger than that of the driven pulley 302.

[0039] Through the two linkage mechanisms, when the two stretching and bending arms 3 rotate synchronously in opposite directions, the gear shafts 109 of the two transmission structures can be driven to rotate in opposite directions at a constant speed, thereby driving the six rotating arms 102 of the two rolling devices to rotate in opposite directions and unfold to both ends, thereby driving the six rolling shafts 114 to roll evenly and disperse on one side of the workpiece, so that the pressure applied to one side of the workpiece is more evenly distributed, further improving the stretching and bending forming quality of the workpiece.

[0040] Furthermore, two ends of the table 1 are symmetrically rotatably connected to two bending cylinders 4, the telescopic ends of the two bending cylinders 4 are respectively rotatably connected to two bending arms 3, one end of the two bending arms 3 is rotatably connected to a C-shaped frame 5, and one side of the inner side of the two C-shaped frames 5 is movably provided with a push plate 6 (such as Figure 7 As shown), a slide groove 7 is provided on one side of the two push plates 6, a slide bar 8 slidably connected to the inner side of the slide groove 7 is fixed to the inner side of the two C-shaped frames 5, and two limit baffles 11 are provided at both ends of the two push plates 6;

[0041] The telescopic ends of the two bending cylinders 4 are controlled to extend synchronously, and the telescopic ends of the two bending cylinders 4 respectively push the two bending arms 3 to rotate in a direction parallel to the length direction of the table 1. The two bending arms 3 apply thrust to the two push plates 6 through the two C-shaped frames 5 located at the ends. The two push plates 6 respectively apply thrust to the two ends of the workpiece, so that the workpiece can be bent and pressed tightly against the curved side of the mold 2, so that the workpiece can be pulled to complete a curvature similar to the curved side of the mold 2. The two push plates 6 can achieve relative movement between the push plates 6 and the C-shaped frames 5 through the sliding cooperation between the slide grooves 7 and the slide bars 8. Since the distance between the two ends of the workpiece will change after bending, the sliding cooperation between the push plates 6 and the C-shaped frames 5 can prevent the workpiece surface from directly rubbing against the inner side of the C-shaped frames 5, thereby avoiding scratches on the workpiece surface and further improving the bending quality of the workpiece.

[0042] Furthermore, a long slot 111 is provided at one end of each rotating arm 102, a rolling cylinder 112 is installed at one end of the inner side of the long slot 111, a sliding frame 113 is fixed to the telescopic end of the rolling cylinder 112, the sliding frame 113 is movably connected to the inner side of the long slot 111, the sliding frame 113 and the rolling shaft 114 are movably connected through an elastic structure, a slot 116 for the rolling shaft 114 to pass through is provided on the lower side of the rotating arm 102, the elastic structure includes a guide rod 201 fixed to the inner side of the sliding frame 113, an inner slider 202 is slidably connected to the outer side of the guide rod 201, one end of the inner slider 202 is elastically connected to one end of the inner side of the sliding frame 113 through a strong coil spring 203, the upper end of the rolling shaft 114 is rotatably connected to the lower side of the inner slider 202, and a rubber sleeve 115 is sleeved on the outer lower end of the rolling shaft 114;

[0043] The telescopic ends of the rolling cylinder 112 retract and drive the corresponding sliding frames 113 to move. The sliding frames 113 drive the rolling shaft 114 to move toward one side of the workpiece through the elastic structure until the rolling shaft 114 contacts one side of the workpiece. At this time, the telescopic end of the rolling cylinder 112 continues to retract and drives the sliding frame 113 to continue to move. At this time, since the rolling shaft 114 is blocked by the workpiece, the inner sliding block 202 in the elastic structure moves relatively on the inner side of the sliding frame 113 and compresses the strong coil spring 203. As the strong coil spring 203 is gradually compressed, the strong coil spring 203 applies a reaction force to the inner sliding block 202, and then transmits it to one side of the workpiece through the rolling shaft 114, so that the rubber sleeve 115 on the outside of the rolling shaft 114 can be pressed against one side of the workpiece, so that the workpiece can fully fit the curved surface side of the mold 2.

[0044] Furthermore, the outer side of the sliding frame 113 is rotatably connected to eight sliding frame rollers 117 arranged in a matrix, and the eight sliding frame rollers 117 are respectively rotatably connected to the upper and lower sides of the inner side of the long slot 111;

[0045] The sliding frame roller 117 is connected in a rolling manner with the inner side of the long groove 111, thereby reducing the movement resistance between the sliding frame 113 and the long groove 111, and at the same time allowing the sliding frame 113 to maintain a horizontal angle of movement, thereby allowing the rolling shaft 114 to maintain a vertical angle, thereby applying a uniform thrust to one side of the workpiece.

[0046] Furthermore, a tightening cylinder 9 is installed on the upper side of the table 1 close to the curved surface of the mold 2, and a tightening plate 10 is fixed to the telescopic end of the tightening cylinder 9;

[0047] The telescopic end of the clamping oil cylinder 9 is controlled to extend to drive the clamping plate 10 to press against one side of the workpiece, so that the workpiece can be pressed against the curved surface side of the mold 2 to prevent the workpiece from deflecting during bending.

[0048] Working principle: When in use, place the workpiece to be bent on the upper side of the table 1, and make one side of the workpiece contact with the curved side of the mold 2, then control the telescopic end of the clamping cylinder 9 to extend and drive the clamping plate 10 to press against one side of the workpiece, so that the workpiece can be pressed against the curved side of the mold 2 to prevent the workpiece from shifting during bending;

[0049] Then, the telescopic ends of the multiple rolling cylinders 112 in the two rolling devices are controlled to retract and respectively drive the corresponding sliding frames 113 to move. The sliding frames 113 drive the rolling shafts 114 to move toward one side of the workpiece through the elastic structure until the rolling shafts 114 contact one side of the workpiece. At this time, the telescopic ends of the rolling cylinders 112 continue to retract and drive the sliding frames 113 to continue to move. At this time, since the rolling shafts 114 are blocked by the workpiece, the inner sliding block 202 in the elastic structure moves relatively on the inner side of the sliding frame 113 and compresses the strong coil spring 203. As the strong coil spring 203 is gradually compressed, the strong coil spring 203 applies a reaction force to the inner sliding block 202, which is then transmitted to one side of the workpiece through the rolling shaft 114, so that the rubber sleeve 115 on the outer side of the rolling shaft 114 can be pressed against one side of the workpiece. When the workpiece is bent, the stress in the middle section of the workpiece can be well offset, and the middle section of the workpiece can be prevented from warping, so that the middle section of the workpiece can be fully fitted on the curved surface side of the mold 2, thereby improving the bending quality.

[0050] Then, the telescopic ends of the two bending cylinders 4 are controlled to extend synchronously, and the telescopic ends of the two bending cylinders 4 respectively push the two bending arms 3 to rotate in a direction parallel to the length direction of the table 1, and the two bending arms 3 apply thrust to the two push plates 6 through the two C-shaped frames 5 located at the ends. The two push plates 6 respectively apply thrust to the two ends of the workpiece, so that the workpiece can be bent and pressed tightly against the curved surface side of the mold 2, so that the workpiece can be pulled to complete the curvature similar to the curved surface side of the mold 2. The two push plates 6 can achieve relative movement between the push plates 6 and the C-shaped frames 5 through the sliding cooperation between the slide grooves 7 and the slide bars 8. Since the distance between the two ends of the workpiece will change after bending, the sliding cooperation between the push plates 6 and the C-shaped frames 5 can prevent the workpiece surface from directly rubbing against the inner side of the C-shaped frames 5, thereby avoiding scratches on the workpiece surface and further improving the bending quality of the workpiece.

[0051] During the bending process of the workpiece, the two bending arms 3 rotate and drive the two driving pulleys 301 of the two linkage mechanisms to rotate in opposite directions at a constant speed. The two driving pulleys 301 can respectively drive the two driven pulleys 302 to rotate in opposite directions at a constant speed through the synchronous belt 303. Since the diameter of the driving pulley 301 is larger than that of the driven pulley 302, the two driven pulleys 302 can be driven to rotate at a larger angular velocity. The rotation of the two driven pulleys 302 at a higher angular velocity can respectively drive the two gear shafts 109 of the two transmission structures to rotate in opposite directions at a constant speed. The two gear shafts 109 respectively drive the six outer driving bevel gears 110 to rotate in opposite directions. Every three driving bevel gears 110 correspond to a differential drive mechanism. The three driving bevel gears 110 drive the three driven bevel gears of the differential drive mechanism through tooth meshing. The driven bevel gear 106 rotates. Since the number of teeth of the three driven bevel gears 106 decreases from top to bottom, the rotation angular speeds of the three driven bevel gears 106 increase from top to bottom. Therefore, the three driven bevel gears 106 respectively drive the three worm gears 105 to rotate at different angular speeds. The rotation angular speeds of the three worm gears 105 also increase from top to bottom. Therefore, at the same time, the three worm gears 105 respectively drive the three semicircular worm wheels 103 to rotate at different angles, thereby driving the three rotating arms 102 to rotate at different angles. The rotation angles of the three rotating arms 102 increase from top to bottom. Therefore, in the process of bending the workpiece by the two bending arms 3, the three rotating arms 102 of the rolling device can be rotated and unfolded synchronously. The three rotating arms 102 respectively drive the three rolling shafts 114 to roll and separate from the middle section to the end of the workpiece in sequence, such as Figure 8The state shown, therefore, when the workpiece is stretched and bent, through the cooperation of the two rolling devices, the rolling can be carried out from the middle section of the workpiece to both ends in sequence, and a certain pressure is applied to the position of the workpiece where the bending is deformed, so that the position of the bending deformation can always fit on the curved side of the mold 2, which can effectively avoid the warping of the middle section, greatly improving the stretch and bending forming quality of the workpiece, and applying multi-point pressure on the bending deformation of the workpiece can prevent the workpiece from rebounding after the thrust is removed at both ends of the workpiece.

[0052] The above description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-degree-of-freedom bending device for processing automobile exterior parts, comprising a platform (1) and a mold (2), wherein two ends of the platform (1) are symmetrically rotatably connected to two bending arms (3), characterized in that: Two rolling devices are symmetrically arranged at the middle section of the upper side of the platform (1); The rolling device comprises a column (101) fixed on the upper side of a table (1); the outer side of the column (101) is rotatably connected to three rotating arms (102); one end of each of the three rotating arms (102) is movably provided with a rolling shaft (114); and the upper side of the table (1) is provided with a differential drive mechanism for driving the three rotating arms (102) to rotate at unequal speeds; The differential drive mechanism comprises three semicircular worm gears (103) fixed to the other ends of the three rotating arms (102), and two vertical plate brackets (104) fixed to the upper side of the table (1); three worms (105) respectively meshing with the three semicircular worm gears (103) are rotatably connected between the two vertical plate brackets (104); driven bevel gears (106) with different numbers of teeth are fixed to one end of the three worm gears (105); and a transmission structure is provided between the three driven bevel gears (106); The transmission structure comprises a gear shaft (109) which penetrates and is rotatably connected to positions corresponding to three driven bevel gears (106) on the platform (1); a driving bevel gear (110) having an equal number of teeth is fixed on the outer side of the gear shaft (109) at a position corresponding to each driven bevel gear (106); the three driving bevel gears (110) are respectively meshed with the three driven bevel gears (106); and the number of teeth of the three driven bevel gears (106) decreases from top to bottom; A linkage mechanism capable of driving the gear shaft (109) to rotate is respectively arranged between the two gear shafts (109) and the two bending arms (3), wherein the linkage mechanism comprises a driven pulley (302) fixed at the lower end of the gear shaft (109) and a driving pulley (301) fixed at one end of the bending arm (3), and the driving pulley (301) and the driven pulley (302) are connected to each other via a synchronous belt (303); The diameter of the driving pulley (301) is greater than the diameter of the driven pulley (302); A long slot (111) is provided at one end of each rotating arm (102); a rolling cylinder (112) is installed at one end of the inner side of the long slot (111); a sliding frame (113) is fixed to the telescopic end of the rolling cylinder (112); the sliding frame (113) is movably connected to the inner side of the long slot (111); the sliding frame (113) and the rolling shaft (114) are movably connected via an elastic structure; and a slot (116) for the rolling shaft (114) to pass through is provided on the lower side of the rotating arm (102); The elastic structure comprises a guide rod (201) fixed on the inner side of the sliding frame (113); the outer side of the guide rod (201) is slidably connected to an inner sliding block (202); one end of the inner sliding block (202) is elastically connected to the inner end of the sliding frame (113) via a strong coil spring (203); the upper end of the rolling shaft (114) is rotatably connected to the lower side of the inner sliding block (202); and the outer lower end of the rolling shaft (114) is sleeved with a rubber sleeve (115).

2. The multi-degree-of-freedom bending device for processing automobile exterior parts according to claim 1, characterized in that: Two bending cylinders (4) are symmetrically rotatably connected at both ends of the table (1), and the telescopic ends of the two bending cylinders (4) are respectively rotatably connected to the two bending arms (3).

3. The multi-degree-of-freedom bending device for processing automobile exterior parts according to claim 1, characterized in that: The outer side of the sliding frame (113) is rotatably connected to eight sliding frame rollers (117) arranged in a matrix, and the eight sliding frame rollers (117) are respectively rollingly connected to the upper and lower sides of the inner side of the long slot (111).

4. The multi-degree-of-freedom bending device for processing automobile exterior parts according to claim 1, characterized in that: A tightening oil cylinder (9) is installed on the curved surface side of the upper side of the table plate (1) close to the mould (2), and a tightening plate (10) is fixed to the telescopic end of the tightening oil cylinder (9).

5. The multi-degree-of-freedom bending device for processing automobile exterior parts according to claim 1, characterized in that: One end of each of the two bending arms (3) is rotatably connected to a C-shaped frame (5), a push plate (6) is movably provided on one side of the interior of each of the two C-shaped frames (5), a slide groove (7) is provided on one side of each of the two push plates (6), a slide bar (8) slidably connected to the inner side of the slide groove (7) is fixed on the inner side of each of the two C-shaped frames (5), and two limit baffles (11) are provided at both ends of each of the two push plates (6).

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