A device for processing a top bend of an automobile outer water cut

Abstract

The utility model discloses an outside water cutting's top bending processing device of car relates to the technical field of automobile parts processing, and aims at solving the problem of the complex structure of existing water cutting top bending equipment, uneven stress of top bending, big problem of forming springback. The device includes bottom plate, top bending unit, tension rotation unit, top bending setting pole and top bending back support beam, bottom plate X two ends horizontal rotation support tension rotation unit, can clamp the both ends of outside water cutting and provide axial tension and follow -up rotation, and the top bending back support beam is fixedly connected between two groups of tension rotation units to continuously support the convex arc surface of outside water cutting, and the top bending unit of Y telescopic is equipped on the one side of bottom plate, and the output end fixedly connects the top bending setting pole of detachable replacement, and is positioned top bending workpiece from Y two sides with back support hinge pole cooperation. The device structure is simple and compact, and the stress of top bending is uniform, and the forming precision is high, and the springback is small, and can adapt to the batch plane top bending processing of different specifications outside water cutting of car.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts processing technology, specifically to a top bending processing device for automotive external water cutters. Background Technology

[0002] The exterior water deflector of an automobile is a long, strip-shaped sealing trim piece installed on the frame of a car door or window. During production, it needs to be bent into an arc shape according to the contour of the car door. Existing water deflector bending equipment mostly adopts a structure with double-sided multi-degree-of-freedom arms and a bottom lifting mold: the arms, which integrate multiple sets of rotating, lifting, and telescopic cylinders, are set on both sides of the base plate to hold the two ends of the workpiece, while the lifting cylinder is set in the middle of the base plate to push the mold plate to apply force to bend the workpiece from the bottom.

[0003] This type of equipment has three obvious drawbacks: First, the arm integrates multiple sets of power components for up-and-down rotation, forward-and-backward rotation, lifting, and extension, resulting in a complex structure, difficult assembly and debugging, and high manufacturing costs. Second, the use of bottom single-point or surface lifting for force application means that the workpiece lacks continuous follow-up support on the convex arc side, leading to poor uniformity of force on the workpiece during bending, which can easily cause uneven local deformation and large springback after forming, making it difficult to ensure the consistency of the curvature of long strips. Third, for the external water-cutting process that only requires planar curvature bending, the multi-degree-of-freedom three-dimensional bending structure has functional redundancy, the overall space occupied by the equipment is large, and it is not conducive to the lightweight layout of the production line. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a top bending processing device for automotive outer water cutters. It adopts a side top bending combined with a cross-type back support structure, combined with an end tensioning and rotating unit. The structure is simple and compact, the top bending force is uniform, the forming accuracy is high, and it is suitable for batch planar top bending processing of automotive outer water cutters.

[0005] To achieve the above objectives, this utility model provides a top-bending processing device for an automotive external water cutter, defining the height direction as the Z-direction, the positioning and extension direction of the external water cutter on the top-bending processing device as the X-direction, and the top-bending force direction of the external water cutter as the Y-direction: The top bending processing device includes a base plate, a top bending unit, a tensioning and rotating unit, a top bending shaping rod, and a top bending back support beam; Both ends of the base plate in the X direction are rotated and supported by tensioning and rotating units on the horizontal plane formed by the XY axes. The top bending back support beam is fixedly connected between the two tensioning and rotating units. The tensioning and rotating units clamp and fix the two ends of the outer water shear, and the top bending back support beam supports the top bending convex arc surface of the outer water shear. The top bending unit is arranged on one side of the base plate. The power output end of the top bending unit faces the top bending concave arc surface cut by the outer water and performs Y-direction telescopic action. The power output end of the top bending unit is fixedly connected to the top bending shaping rod. The top bend shaping rod is the top bend template for external water shear. The top bend shaping rod and the top bend back support beam are used to position the top bend external water shear at both ends in the Y direction.

[0006] Preferably, the tensioning rotation unit includes an L-shaped rotary seat, a lifting seat, a Z-axis clamping hydraulic cylinder, an X-axis tensioning hydraulic cylinder, and a Z-axis through-shaft hydraulic cylinder; The L-shaped rotary seat is rotatably connected to both ends of the top surface of the base plate. The L-shaped rotary seat slides in the Z direction and is constrained to the lifting seat in the X and Y directions. The lifting support inside the L-shaped rotary seat is clamped by the hydraulic cylinder in the Z direction. The power output end of the Z-axis through-shaft hydraulic cylinder is fixedly attached to the top of the lifting platform, and the Z-axis through-shaft hydraulic cylinder provides Z-axis lifting power to the lifting platform. An X-direction tensioning hydraulic cylinder is fixedly installed at one end of the lifting seat in the X direction. The power output end of the X-direction tensioning hydraulic cylinder is fixedly supported by the Z-direction clamping hydraulic cylinder. The X-direction tensioning hydraulic cylinder provides X-direction tensioning power to the external water shear. The power output end of the Z-axis clamping hydraulic cylinder cooperates with the lifting seat to clamp the external water cutter in the Z-axis direction.

[0007] Preferably, the lifting seat is a split structure, including an inner sliding seat, an outer sliding seat, and an X-direction constraint slide rod; The inner sliding seat has a C-shaped open structure. The open side of the inner sliding seat faces the center line of the bottom plate and slides up and down against the L-shaped rotating seat. A Z-axis clamping hydraulic cylinder is fixed in the Z direction at the top of the inner sliding seat. An X-axis constraint slide rod is fixed in the upper part of the inner sliding seat, penetrating the L-shaped rotating seat in the X direction and slidingly inserted into the outer sliding seat in the X direction. The middle open part of the inner sliding seat is set as a clamping area for clamping the outer water-cutting end. The outer sliding seat is a vertical planar structure. The upper part of the outer sliding seat slides in the X direction and is radially constrained by the X-direction constraint rod. The lower part of the outer sliding seat is fixed in the X direction with an X-direction tensioning hydraulic cylinder. The power output end of the X-direction tensioning hydraulic cylinder penetrates the L-shaped rotating seat in the X direction and is fixedly supported on the back of the C-shaped open structure of the inner sliding seat; The X-direction constraint slide bar is set parallel to the piston rod of the X-direction tensioning hydraulic cylinder to counteract the radial force on the piston rod of the X-direction tensioning hydraulic cylinder.

[0008] Preferably, the top-bend back support beam includes a fixed rod, a connecting rod, and a back support rod; The fixed rod is fixedly connected to the L-shaped rotating seat of the tensioning rotating unit, and the fixed rods located at both ends of the base plate are interposed with the back support rods in the X direction at intervals. One of the connecting rods is connected to one end of the back support rod, and the connecting rod is fixedly connected to the fixing rod at that end.

[0009] Preferably, the tensioning and rotating units on the top surfaces at both ends of the base plate are arranged opposite each other and perform opposite or backward rotational actions.

[0010] Preferably, a rotary power cylinder is horizontally rotatably supported on the top surface of both ends of the base plate. The power output end of the rotary power cylinder is hinged to support the tensioning rotation unit in the horizontal plane formed by the X-axis and Y-axis, and the rotary power cylinder provides rotational power to the tensioning rotation unit.

[0011] Preferably, the bending unit includes a bending support, a Y-axis mandrel, and a bending hydraulic cylinder; The top bending support is fixed on the Y-direction side of the middle part of the base plate, and the top bending hydraulic cylinder is fixedly connected to the top bending support in the Y direction. The power output end of the bending hydraulic cylinder is fixedly connected to the Y-axis mandrel; A top bend shaping rod can be detachably connected to the top of the Y-axis according to the bending radius and bending point position of the external water shear. This top bend shaping rod serves as the top bend template for the external water shear, producing a standard top bend curvature and top bend positioning.

[0012] The advantages of this utility model compared with the prior art are as follows: 1. This utility model adopts a force-applying structure of side-mounted top bending unit combined with cross-type top bending back support beam. It pushes the concave arc surface of the workpiece from one side in the Y direction. The back support hinge rod connected between the tensioning units at both ends provides continuous follow-up support for the convex arc surface. During the top bending process, the workpiece is subjected to uniform force throughout, which can effectively suppress forming springback and improve the consistency of the arc. Compared with the existing bottom lifting mold structure, it eliminates the complex layout of bottom guide rail, lifting cylinder and other components, making the equipment structure simpler and occupying less space.

[0013] 2. The tensioning and rotating unit of this utility model integrates end clamping, X-axis tensioning and horizontal plane rotation functions. It can simultaneously apply tension force to both ends of the workpiece during the bending process and rotate adaptively with the curvature to ensure a smooth curvature transition. The split lifting seat, combined with the parallel X-axis constraint slide rod, can directly offset the radial bending moment on the piston rod of the tensioning cylinder, avoid the piston rod bending and jamming, and significantly improve the stability of the mechanism and the service life of the power components.

[0014] 3. The top bending shaping rod of this utility model adopts a detachable installation structure, which can quickly replace the corresponding template according to the bending radius and positioning point of the outer water shear of different vehicle models, and has strong equipment adaptability; the overall solution is optimized for the top bending process of the outer water shear plane, eliminating redundant degrees of freedom, resulting in lower manufacturing and maintenance costs, and is suitable for lightweight configuration of mass production lines. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional enlarged view of the tensioning and rotating unit in this utility model (with the L-shaped rotating seat hidden). Figure 3 This is a partial half-section view of the present invention; In the diagram: 1-Tensioning and rotating unit; 2-Top bending unit; 3-Back support rod; 4-Base plate; 5-External water shear. 101-Z-direction through-shaft hydraulic cylinder; 102-L-shaped rotary seat; 103-X-direction tensioning hydraulic cylinder; 104-Z-direction clamping hydraulic cylinder; 105-rotary power cylinder; 106-fixed rod; 107-connecting rod; 108-inner sliding seat; 109-outer sliding seat; 201-Top bending shaping rod; 202-Y-direction mandrel; 203-Top bending support; 204-Top bending hydraulic cylinder. Detailed Implementation

[0017] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0018] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] This utility model provides a top bending processing device for an automotive external water cutter. The height direction is defined as the Z direction, the initial positioning and length extension direction of the external water cutter 5 on the top bending processing device is the X direction, and the top bending force direction of the external water cutter 5 is the Y direction. The X, Y, and Z directions are mutually perpendicular to each other.

[0021] like Figure 1As shown, this device includes a base plate 4, two sets of tensioning and rotating units 1, a top bending unit 2, a top bending shaping rod 201, and a top bending back support beam. The base plate 4 is a horizontally arranged rectangular load-bearing base. The two sets of tensioning and rotating units 1 are respectively rotatably supported at both ends of the base plate 4 in the X direction, and both can rotate around the Z axis in the horizontal plane formed by the XY axes. The top bending back support beam is fixedly connected between the two sets of tensioning and rotating units 1. The top bending back support beam rotates synchronously with the tensioning and rotating units 1 (the top bending back support beam is a multi-segment rod splicing structure, in which one end with the connecting rod is fixedly connected to the fixed rod and the back support rod as one unit, and the end without the connecting rod is a disconnected structure, which is aligned with the top bending point of the top bending shaping rod), and is used to form a continuous follow-up support for the top bending convex arc surface of the external water shear 5. The top bending unit 2 is fixedly arranged on the Y-direction side of the middle of the base plate 4, and its power output end faces the top bending concave arc surface of the outer water cutter 5, and can perform linear extension and retraction along the Y direction; the power output end of the top bending unit 2 is fixedly connected to the top bending shaping rod 201, which serves as the top bending forming template of the outer water cutter 5, and cooperates with the top bending back support beam on both sides of the Y direction to clamp and bend the outer water cutter 5 to the target arc.

[0022] like Figure 2 , Figure 3 As shown, each tensioning and rotating unit 1 includes an L-shaped rotating seat 102, a lifting seat, a Z-axis clamping hydraulic cylinder 104, an X-axis tensioning hydraulic cylinder 103, and a Z-axis through-shaft hydraulic cylinder 101.

[0023] The L-shaped rotary seat 102 is integrally formed by a horizontal section and a vertical section. The bottom of its horizontal section is rotatably connected to the top surface of the base plate 4 via a rotary shaft, allowing it to reciprocate around the Z-axis in the horizontal plane. A Z-axis guide rail is provided on the inner side of the vertical section of the L-shaped rotary seat 102. The lifting seat is slidably mounted on this guide rail and, constrained by the guide rail, can only move up and down along the Z-axis; X-axis and Y-axis displacements are restricted. A Z-axis through-shaft hydraulic cylinder 101 is fixed to the top of the L-shaped rotary seat 102. Its power output end is connected to the top of the lifting seat along the Z-axis downwards via a screw drive structure, providing Z-axis lifting power to the lifting seat to accommodate external water-cutting 5 workpieces with different cross-sectional heights.

[0024] The lifting seat adopts a split structure, including an inner sliding seat 108, an outer sliding seat 109, and X-direction constraint slide rods. The inner sliding seat 108 has a C-shaped open structure, with its open side facing the centerline of the base plate 4, and its back slidingly attached to the Z-guide rail of the L-shaped rotating seat 102. The top of the inner sliding seat 108 is fixedly equipped with a Z-direction clamping hydraulic cylinder 104 in the Z direction, and the open space in the middle is the clamping area for clamping the end of the outer water cutter 5. The upper part of the inner sliding seat 108 is fixedly provided with multiple X-direction constraint slide rods extending in the X direction. The X-direction constraint slide rods horizontally penetrate the vertical section of the L-shaped rotating seat 102 and slide outward into the upper guide hole of the outer sliding seat 109.

[0025] The outer sliding seat 109 is a vertical planar structure, arranged on the outside of the L-shaped rotating seat 102. Its upper part slides and engages with the X-direction constraint slide rod through a guide hole, forming a radial constraint on the X-direction constraint slide rod. The lower part of the outer sliding seat 109 is fixedly mounted with an X-direction tensioning hydraulic cylinder 103 in the X direction. The piston rod of the X-direction tensioning hydraulic cylinder 103 penetrates the L-shaped rotating seat 102 inward along the X direction, and its end is fixedly supported on the back of the C-shaped structure of the inner sliding seat 108. The X-direction constraint slide rod and the piston rod of the X-direction tensioning hydraulic cylinder 103 are arranged parallel to each other, which can counteract the radial bending moment on the piston rod during the tensioning operation, avoid piston rod wear and jamming, and improve the stability of the mechanism and the service life of the components.

[0026] The power output end of the Z-axis clamping hydraulic cylinder 104 is arranged downward along the Z-axis, corresponding to the clamping platform at the lower part of the inner sliding seat 108, and cooperates to complete the Z-axis clamping and fixing of the end of the outer water cutter 5.

[0027] like Figure 1 , Figure 3 As shown, the top-bending back support beam includes a fixed rod 106, a connecting rod 107, and a back support rod 3. Two fixed rods 106 are provided, horizontally fixed to the inner sidewalls of the L-shaped rotating seats 102 at both ends, rotating synchronously with the L-shaped rotating seats 102. The back support rod 3 is butted together between the two fixed rods 106 along the X-direction, with the side of the back support rod 3 facing the workpiece serving as the support surface, which fits and conforms to the convex arc contour of the outer water-cutting shear 5. The connecting rod 107 is fixedly connected to the back of the back support rod 3, and the end of the connecting rod 107 is fixedly connected to the corresponding fixed rod 106. Depending on the different connection positions of the connecting rod at both ends of the back support rod, it adapts to the processing of outer water-cutting shears bending in different directions on the left / right sides of the vehicle.

[0028] like Figure 1 As shown, rotary power cylinders 105 are hinged to the top surfaces of both ends of the base plate 4. The tail of the cylinder body of the rotary power cylinder 105 is hinged to the top surface of the base plate 4, and the end of the piston rod is hinged to the outer wall of the L-shaped rotating seat 102. When the two sets of rotary power cylinders 105 extend and retract synchronously, they can drive the tensioning rotation units 1 at both ends to perform horizontal rotation movements in opposite or opposite directions, so that the two ends of the outer water cutter 5 can rotate adaptively during the bending process, ensuring a smooth transition of the arc without creases.

[0029] like Figure 1 , Figure 3As shown, the top bending unit 2 includes a top bending support 203, a Y-direction mandrel 202, and a top bending hydraulic cylinder 204. The top bending support 203 is fixedly installed on the Y-direction side of the middle of the base plate 4. The top bending hydraulic cylinder 204 is horizontally fixed on the top bending support 203 along the Y-direction, with its piston rod extending towards the workpiece of the outer water cutter 5. The end of the piston rod is fixedly connected to the Y-direction mandrel 202. The front end of the Y-direction mandrel 202 is detachably connected to the top bending shaping rod 201 by bolts. The working surface of the top bending shaping rod 201 is machined with a standard top bending arc that matches the target outer water cutter 5. For outer water cutter products of different models and different bending parameters, the corresponding specification of the top bending shaping rod 201 can be quickly replaced, improving the equipment's universal adaptability.

[0030] The working principle of this utility model is as follows: 1. Material Preparation: In the initial state, the top bending hydraulic cylinder 204 is in the retracted position, the Z-axis clamping hydraulic cylinder 104 is in the released state, the X-axis tensioning hydraulic cylinder 103 is in the retracted position, and the two-end rotating power cylinders 105 are in the initial neutral position. Place both ends of the workpiece to be processed (external water-cutting 5) into the clamping areas of the inner sliding seats 108 on both sides, so that the convex arc side back of the workpiece is in contact with the support surface of the back support rod 3, completing the initial positioning of the workpiece.

[0031] 2. Clamping and tensioning: Start the Z-axis clamping hydraulic cylinder 104, the piston rod extends downward and cooperates with the clamping platform of the inner sliding seat 108 to clamp and fix the two ends of the outer water cutter 5 from the Z direction; then start the X-axis tensioning hydraulic cylinder 103, the piston rod extends and pushes the inner sliding seat 108 to move slightly outward along the X direction, apply the set axial (X-direction) pretensioning force to the outer water cutter 5, eliminate the initial slack of the workpiece, avoid X-direction sliding misalignment during the bending process of the workpiece, ensure uniform arc extension during the bending process, and suppress forming springback.

[0032] 3. Top Bending Forming: The top bending hydraulic cylinder 204 is activated, and the piston rod extends along the Y-axis, driving the Y-axis mandrel 202 and the top bending shaping rod 201 to feed towards the concave arc surface of the outer water cutter 5. Simultaneously, the rotary power cylinders 105 at both ends operate synchronously, pushing the L-shaped rotating seat 102 to rotate in opposite directions around the Z-axis, causing both ends of the outer water cutter 5 to rotate synchronously with the top bending arc. The back support rod 3 rotates synchronously with the L-shaped rotating seat 102, fitting and supporting the convex arc surface of the outer water cutter 5 throughout the entire process. The top bending shaping rod 201 stops after feeding to the set position. At this time, the outer water cutter 5 is clamped between the top bending shaping rod 201 and the back support rod 3, forming the standard target arc.

[0033] 4. Pressure Holding and Reset: After the pressure holding time is set to stabilize the forming arc and reduce springback, each power component resets in sequence: the top bending hydraulic cylinder 204 retracts, driving the top bending shaping rod 201 back to the initial position; the rotary power cylinder 105 retracts, driving the tensioning rotation unit 1 to rotate back to the initial angle; the X-axis tensioning hydraulic cylinder 103 retracts, releasing the workpiece tension; finally, the Z-axis clamping hydraulic cylinder 104 rises to release the workpiece, and the processed outer water cutter 5 is taken out, completing a single processing cycle.

[0034] Finally, any aspects of this utility model not fully described herein utilize existing mature products and technologies.

[0035] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A top-bending processing device for an automotive external water cutter, defining the height direction as the Z-direction, the positioning and extension direction of the external water cutter on the top-bending processing device as the X-direction, and the top-bending force direction of the external water cutter as the Y-direction, characterized in that: The top bending processing device includes a base plate, a top bending unit, a tensioning and rotating unit, a top bending shaping rod, and a top bending back support beam; The base plate has two ends in the X direction that rotate to support the tensioning and rotating unit on the horizontal plane formed by the XY axis. The tensioning and rotating unit is equipped with a Z-direction clamping hydraulic cylinder and an X-direction tensioning hydraulic cylinder. The two tensioning and rotating units are fixedly connected to a top-bending back support beam. The Z-direction clamping hydraulic cylinder of the tensioning and rotating unit applies a Z-direction clamping force to the two ends of the outer water shear, and the X-direction tensioning hydraulic cylinder applies an X-direction tensioning force to the two ends of the outer water shear to fix the two ends of the outer water shear. The top-bending back support beam then supports the top-bending convex arc surface of the outer water shear. The top bending unit is arranged on one side of the bottom plate. The power output end of the top bending unit faces the top bending concave arc surface cut by the outer water and performs Y-direction telescopic action. The power output end of the top bending unit is fixedly connected to the top bending shaping rod. The top bend shaping rod is a top bend template for external water shearing. The top bend shaping rod and the top bend back support beam are used to position the top bend external water shearing at both ends in the Y direction.

2. The top bending processing device for automotive external water cutting according to claim 1, characterized in that: The tensioning rotation unit includes an L-shaped rotary seat, a lifting seat, and a Z-axis through-shaft hydraulic cylinder; The L-shaped rotary seat is rotatably connected to both ends of the top surface of the base plate. The L-shaped rotary seat slides in the Z direction and is constrained to the lifting seat in the X and Y directions. The lifting support inside the L-shaped rotary seat is a Z-direction clamping hydraulic cylinder. The power output end of the Z-axis through-shaft hydraulic cylinder is fixedly attached to the top of the lifting seat, and the Z-axis through-shaft hydraulic cylinder provides Z-axis lifting power to the lifting seat; An X-direction tensioning hydraulic cylinder is fixedly installed at one end of the lifting seat in the X direction. The power output end of the X-direction tensioning hydraulic cylinder is fixedly supported by the Z-direction clamping hydraulic cylinder. The X-direction tensioning hydraulic cylinder provides X-direction tensioning power for the external water shear. The power output end of the Z-axis clamping hydraulic cylinder cooperates with the lifting seat to clamp the external water cutter in the Z-axis direction.

3. The top bending processing device for automotive external water cutting according to claim 2, characterized in that: The lifting seat is a split structure, including an inner sliding seat, an outer sliding seat, and an X-direction constraint slide rod; The inner sliding seat has a C-shaped open structure. The open side of the inner sliding seat faces the center line of the bottom plate and slides up and down against the L-shaped rotating seat. A Z-direction clamping hydraulic cylinder is fixed in the Z direction at the top of the inner sliding seat. An X-direction constraint slide rod is fixed in the upper part of the inner sliding seat, penetrating the L-shaped rotating seat in the X direction and slidingly inserted into the outer sliding seat in the X direction. The middle open part of the inner sliding seat is set as a clamping area for clamping the outer water-cutting end. The outer sliding seat is a vertical planar structure. The upper part of the outer sliding seat slides in the X direction and is radially constrained by the X-direction constraint rod. The lower part of the outer sliding seat is fixed in the X direction with an X-direction tensioning hydraulic cylinder. The power output end of the X-direction tensioning hydraulic cylinder penetrates the L-shaped rotating seat in the X direction and is fixedly supported on the back of the C-shaped open structure of the inner sliding seat. The X-direction constraint slide bar is arranged parallel to the piston rod of the X-direction tensioning hydraulic cylinder to counteract the radial force on the piston rod of the X-direction tensioning hydraulic cylinder.

4. The top bending processing device for automotive external water cutting according to claim 2, characterized in that: The top-bend back support beam includes a fixed rod, a connecting rod, and a back support rod; The fixed rod is fixedly connected to the L-shaped rotating seat of the tensioning and rotating unit, and the fixed rods located at both ends of the base plate are connected to the back support rods at an X-direction interval. One of the connecting rods is selectively connected to one end of the back support rod, and the connecting rod is fixedly connected to the fixing rod at that end.

5. The top bending processing device for automotive external water cutting according to claim 1, characterized in that: The tensioning and rotating units on the top surfaces at both ends of the base plate are arranged opposite each other and perform opposite or backward rotation actions.

6. The top bending processing device for automotive external water cutting according to claim 5, characterized in that: The bottom plate has a rotary power cylinder horizontally rotatably supported on both ends of the top surface. The power output end of the rotary power cylinder is hinged to support the tensioning rotation unit in the horizontal plane formed by the X-axis and Y-axis, and the rotary power cylinder provides rotational power to the tensioning rotation unit.

7. The top bending processing device for automotive external water cutting according to claim 1, characterized in that: The bending unit includes a bending support, a Y-axis mandrel, and a bending hydraulic cylinder. The top bending support is fixed on the Y-direction side of the middle part of the base plate, and the top bending hydraulic cylinder is fixedly connected to the top bending support in the Y direction. The power output end of the top-bending hydraulic cylinder is fixedly connected to the Y-axis jack. The top of the Y-direction top is detachably connected to the top bending shaping rod according to the bending radius and bending point position of the external water shear. The top bending shaping rod serves as the top bending template for the external water shear, producing a standard top bending arc and top bending positioning.

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