A small pitch spiral tube multi-roll push bending and numerical control bending composite forming equipment and method

Abstract

The present application belongs to the technical field of plastic forming of pipe material, and discloses a kind of extremely small pitch helical pipe multi-roll push bending and numerical control bending composite forming equipment and method, and multi-roll push bending forming unit and numerical control bending forming unit are arranged at one end of push-rotation composite unit in axial direction, numerical control bending forming unit is arranged at the one side of the discharge end of multi-roll push bending forming unit, and numerical control bending forming unit is installed on rotation-lift transposition composite mechanism;One side of the support roller in multi-roll push bending forming unit is provided with side-by-side arranged bending roller and pressure roller, lift roller is installed on machine tool, and forming roller is installed on rotation-lift transposition composite mechanism;Bending die in numerical control bending forming unit is installed at one end of clamping block, and gap is arranged between the other end of clamping block and bending die.The present application realizes continuous, alternating and orderly forming of extremely small pitch helical section and local bending section on the same equipment, and significantly improves the forming flexibility, forming precision and processing efficiency of complex spatial helical pipe.

Description

Technical Field

[0001] This invention belongs to the field of pipe plastic forming and precision manufacturing technology of complex spatial pipes, and in particular, it is a composite forming equipment and method for multi-roller push bending and CNC winding of extremely small pitch spiral tubes. Background Technology

[0002] Pipe bending components are widely used in aerospace, nuclear energy, chemical industry, heat exchange equipment, hydraulic pipelines, and high-end equipment manufacturing due to their lightweight, strong spatial adaptability, high fluid transport efficiency, and high structural integration. As engineering equipment develops towards higher integration, miniaturization, and high reliability, the spatial structure of pipeline components is becoming increasingly complex. In particular, complex spatial spiral tubes that simultaneously contain extremely small pitch helical segments and local small-angle bending segments, small bending radius bending segments, fixed radius bending segments, or short arc small-angle bending segments place higher demands on the spatial adaptability, continuous forming capability, and local forming accuracy of forming equipment.

[0003] Currently, forming methods for complex spatial tubing mainly include CNC bending, multi-roller bending, roll bending, and free bending. Among these, CNC bending technology offers advantages such as high precision in controlling local bending radius and angle, stable forming process, and suitability for forming small bending radii and short arc bending segments. However, it typically relies on a fixed bending die and a specific bending plane, making it difficult to independently achieve flexible forming of extremely small pitch spiral segments, spatial spiral segments, and continuous bending-torsion coupled tubing. Multi-roller bending technology, through the synergistic action of components such as support rollers, pressure rollers, bending rollers, forming rollers, and lifting rollers, can achieve control over the bending radius and pitch of the tubing during continuous axial advancement, making it suitable for continuous forming of extremely small pitch spiral tubes and spatial spiral tubes. However, single multi-roller bending technology still faces challenges in forming locally small-angle bending segments, small-radius bending segments, fixed-radius bending segments, or short arc small-angle bending segments, including difficulties in controlling local forming precision, complex motion control, and insufficient forming stability.

[0004] Therefore, existing single forming processes cannot simultaneously meet the requirements of continuous flexible forming of extremely small pitch helical segments and high-precision forming of local short-arc bending segments. It is necessary to provide a composite forming equipment that combines multi-roller push bending and CNC bending to solve the forming problem of complex spatial tubes that simultaneously contain extremely small pitch helical segments and local small-angle bending segments, small bending radius bending segments, fixed radius bending segments, or short-arc small-angle bending segments. Summary of the Invention

[0005] The purpose of this invention is to provide a composite forming equipment and method for multi-roller bending and CNC bending of extremely small pitch spiral tubes, which solves the problem that existing single forming processes cannot simultaneously meet the continuous flexible forming requirements of extremely small pitch spiral segments and the high-precision forming requirements of local short arc bending segments.

[0006] To achieve the above objectives, the present invention employs the following technical solution: In the first aspect, this application proposes a composite forming equipment for multi-roller push bending and CNC winding bending of a very small pitch spiral tube, including a multi-roller push bending forming unit, a CNC winding forming unit, a push-rotation composite unit and a rotation-lifting and shifting composite mechanism. The multi-roller push-bending forming unit and the CNC winding forming unit are set at one end of the axial direction of the push-rotation composite unit, the CNC winding forming unit is set on one side of the discharge end of the multi-roller push-bending forming unit, and the CNC winding forming unit is installed on the rotation-lifting and shifting composite mechanism. The multi-roller push-bending forming unit is equipped with several arrays of support rollers, lifting rollers and forming rollers. Bending rollers and pressure rollers are installed side by side on one side of the support rollers. The lifting rollers are installed on the machine tool and the forming rollers are installed on the rotary-lifting and shifting compound mechanism. The CNC bending forming unit is equipped with a clamping block and a bending die. The bending die is installed at one end of the clamping block, and a gap is provided between the clamping block and the other end of the bending die.

[0007] Furthermore, a clamping mechanism is installed on the machine tool, which is located between the propulsion-rotation composite unit and the multi-roller bending forming unit.

[0008] Furthermore, the propulsion-rotation composite unit is equipped with a propulsion mechanism slide rail, and a propulsion-rotation composite mechanism is installed on the propulsion mechanism slide rail.

[0009] Furthermore, the lifting roller is mounted on the lifting roller lifting mechanism, which is mounted on the machine tool.

[0010] Furthermore, the rotary-lifting transposition compound mechanism is mounted on the machine tool via a transposition mounting base, on which a rotary component and a lifting component are mounted.

[0011] Furthermore, the forming roller is mounted on the forming roller slide rail, which is fixedly mounted on one side of the rotary-lifting and shifting composite mechanism.

[0012] Furthermore, a transition positioning area is provided between the multi-roller push-bending forming unit and the CNC winding forming unit.

[0013] Furthermore, a rotary drive device is installed at the bottom of the clamping block to drive the clamping block to rotate around the central axis of the bending die.

[0014] Secondly, this application proposes a composite forming method for multi-roller bending and CNC bending of the extremely small pitch spiral tube using the aforementioned equipment, comprising: The tube blank to be formed is placed on the machine tool. When the area to be formed is a spiral section with a very small pitch, a spatial spiral section, or a continuous spatial bending section with bending-torsion coupling characteristics, the rotation-lifting and repositioning compound mechanism causes the forming roller to enter the multi-roller push bending forming station, and the clamping block and bending die are in the avoidance position. The push-rotate composite unit clamps and pushes the tube blank for continuous axial feeding. The forming roller makes an eccentric motion, and the lifting roller makes a lifting motion. The amount of motion of the forming roller and the lifting roller directly determines the bending radius and pitch of the coiled tube. The tube blank is moved to the predetermined position to complete the forming of the extremely small pitch spiral section of the tube component, and the forming roller returns to the original equilibrium position; When the area to be formed is a local small-angle bending section, a local small-radius bending section, a fixed-radius bending section, or a short-arc small-angle bending section, the rotary-lifting and shifting composite mechanism rotates 90° counterclockwise, the forming roller exits the plane to be bent, and the clamping block and bending die enter the CNC bending forming station. Under the action of the propulsion-rotation composite unit, the tube blank rotates around its own axis to the preset forming plane and is axially fed to the bending position to achieve the forming of small-angle bending sections, small-radius bending sections, fixed-radius bending sections or short-arc small-angle bending sections under different planes. The clamping block clamps the pipe section to be bent. The clamping block rotates around the central axis of the bending die, so that the pipe blank fits the bending die to form a preset bending angle, thus completing the CNC bending forming. The clamping block returns to the original equilibrium position. The rotation-lifting and repositioning compound mechanism rotates 90° clockwise, so that the forming roller returns to the plane to be bent, and the clamping block and bending die exit the CNC bending forming station. Based on the geometric characteristics of the target tube, repeat the above forming process until the composite forming of the extremely small pitch spiral tube and the locally bent section is completed. Then, remove the complex space tube component, and the forming process of the complex space tube component is completed.

[0015] Furthermore, the transition positioning area set between the multi-roll push-bending forming unit and the CNC winding forming unit forms a clamping reserved section, tangential transition section or process transition section between the multi-roll push-bending forming section and the CNC winding forming section, so that the tube blank can be switched and adjusted between the multi-roll push-bending forming station and the CNC winding forming station.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a composite forming equipment for multi-roller push bending and CNC winding bending of a spiral tube with a very small pitch. By integrating the multi-roller push bending forming mechanism with the CNC winding forming mechanism, and mounting the CNC winding forming unit on the rotary-lifting and shifting composite mechanism, the organic integration of two units with different forming principles in space is achieved. The array arrangement of support rollers, bending rollers, pressure rollers, lifting rollers, and forming rollers in the multi-roll push-bending forming unit, along with the structural design of the forming rollers mounted on the rotary-lifting-positioning composite mechanism, enables the multi-roll push-bending forming mechanism to handle the forming of extremely small pitch spiral segments, spatial spiral segments, or continuous spatial bending segments with bending-torsional coupling characteristics. Meanwhile, the structure of the pre-reserved gap between the clamping block and the bending die in the CNC winding forming unit provides spatial assurance for the precise positioning and clamping of the tube blank before winding forming. This provides an integrated and continuous forming equipment foundation for complex spatial tubes that simultaneously contain extremely small pitch spiral segments and local short-arc bending segments. The CNC winding forming mechanism is responsible for forming local small-angle bending segments, small-radius bending segments, fixed-radius bending segments, or short-arc small-angle bending segments, thereby achieving continuous composite forming of different geometric feature regions in complex spatial tubes. Furthermore, the coordinated operation between the two forming methods is achieved through the propulsion-rotation composite mechanism and the rotary-lifting-positioning composite mechanism, thereby improving the forming flexibility, forming accuracy, and processing efficiency of complex spatial spiral tubes. This invention is particularly suitable for the continuous composite forming of complex spatial tubular components containing extremely small pitch spiral segments, spatial spiral segments, and locally small-angle bending segments, small-bending-radius bending segments, fixed-radius bending segments, or short-arc small-angle bending segments.

[0017] Furthermore, by setting a clamping mechanism between the propulsion-rotation composite unit and the multi-roller push-bending forming unit on the machine tool, the tube blank can obtain stable radial clamping constraint during the process of being pushed into the multi-roller push-bending forming area by the propulsion-rotation composite unit. This effectively prevents the tube blank from axially instability or bending deformation under the action of axial propulsion force, ensuring the straightness and posture stability of the tube blank before entering the forming area, thereby improving the stability and forming accuracy of the entire push-bending forming process.

[0018] Furthermore, by setting the propulsion-rotation composite unit to include a propulsion mechanism slide rail and a propulsion-rotation composite mechanism mounted thereon, the propulsion-rotation composite mechanism can both move linearly along the slide rail to achieve continuous axial feeding of the tube blank and drive the tube blank to rotate around its own axis to achieve posture adjustment of the tube blank in space. This composite motion capability satisfies both the requirement of continuous axial propulsion during multi-roll push bending and the requirement of rotating the tube blank around the axis to the preset forming plane before CNC bending, providing a motion basis for the spatial posture connection between the two types of forming units.

[0019] Furthermore, the lifting roller is installed on the lifting roller lifting mechanism and the lifting roller lifting mechanism is installed on the machine tool, so that the lifting roller can perform precise lifting displacement along the Z-axis direction under the lifting drive independent of other roller systems. This lifting motion works in coordination with the eccentric motion of the forming roller, which can directly control the pitch value formed by the tube blank during the push bending forming process, thereby achieving precise control of the pitch parameter of the spiral segment of the extremely small pitch spiral tube, and ensuring that the forming size of the spiral segment meets the design requirements.

[0020] Furthermore, the rotary-lifting transposition compound mechanism is mounted on the machine tool via a transposition mounting base, and a rotary component and a lifting component are set on the transposition mounting base. This allows the rotary-lifting transposition compound mechanism to have the motion capability of two degrees of freedom: rotary transposition and lifting movement. This structural design ensures that the forming rollers, clamping blocks and bending dies mounted on it can accurately and stably switch spatial positions between the multi-roller push bending forming station and the CNC bending forming station, providing a reliable mechanical motion basis for the orderly connection and non-interference of the two types of forming units.

[0021] Furthermore, the forming roller is mounted on the forming roller slide rail and the forming roller slide rail is fixedly mounted on one side of the rotary-lifting and repositioning composite mechanism. This allows the forming roller to perform independent eccentric movement along the tube forming direction on its own slide rail while switching work positions with the rotary-lifting and repositioning composite mechanism. This structure ensures that the forming roller can actively control the bending deformation of the tube blank during the multi-roller push bending forming process, and also ensures that it can exit the bending plane as a whole with the composite mechanism during CNC bending forming. The structure is compact and the motion logic is clear.

[0022] Furthermore, a transition positioning area is set between the multi-roll push-bending forming unit and the CNC winding forming unit, so that the billet has a physical space for posture adjustment and clamping and repositioning after completing the multi-roll push-bending forming section and before entering the CNC winding forming section. This transition positioning area can form a clamping reserve section, a tangent transition section or a process transition section, thereby ensuring that the billet has sufficient clamping, positioning and posture adjustment space when switching between the two types of forming stations, and avoiding billet interference or positioning deviation caused by station switching.

[0023] Furthermore, by installing a rotary drive device at the bottom of the clamping block and driving the clamping block to rotate around the central axis of the bending die, the clamping block can make a precise arc movement with the bending die as the forming reference after clamping the pipe section to be bent, thereby tightly fitting the pipe blank to the surface of the bending die to form a preset bending angle. This structure ensures the control accuracy of the bending angle and bending radius during the CNC bending forming process, and is especially suitable for the high-precision forming requirements of local small-angle bending sections, small bending radius bending sections, fixed radius bending sections, or short arc small-angle bending sections.

[0024] This invention also provides a multi-roller push-bending and CNC winding composite forming method for extremely small pitch spiral tubes. In the multi-roller push-bending stage, a rotary-lifting positioning composite mechanism feeds the forming rollers into the workstation while the clamping block and bending die avoid contact. A push-rotation composite unit drives the tube blank to feed continuously, coordinating with the eccentric motion of the forming rollers and the lifting motion of the lifting rollers to complete the forming of the extremely small pitch spiral segment. Then, the rotary-lifting positioning composite mechanism rotates 90° counterclockwise to feed the clamping block and bending die into the CNC winding workstation, causing the forming rollers to retract. The push-rotation composite unit drives the tube blank to rotate to a preset plane and feeds it axially to the bending position. The clamping block then rotates around the bending die to complete the forming of a partial bending segment. Finally, a 90° clockwise rotation resets the tube and repeats the above process. This achieves continuous, alternating, and orderly forming of the extremely small pitch spiral segment and the partial bending segment on the same equipment, effectively solving the technical problem that a single forming process cannot simultaneously meet the forming requirements of two different geometric features. This significantly improves the forming flexibility, forming accuracy, and processing efficiency of complex spatial spiral tubes. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the composite forming equipment for multi-roller bending and CNC bending of the extremely small pitch spiral tube according to the present invention.

[0027] Figure 2 This is a schematic diagram of the CNC bending forming station of the multi-roller push bending and CNC winding composite forming equipment for the extremely small pitch spiral tube of the present invention.

[0028] Figure 3 This is a schematic diagram of the multi-roller push-bending and CNC winding composite forming equipment for the extremely small pitch spiral tube of the present invention at the multi-roller push-bending forming station.

[0029] Figure 4 This is a flowchart of the composite forming method of multi-roller pushing and CNC winding of the extremely small pitch spiral tube according to the present invention.

[0030] Wherein: 1-Propulsion mechanism slide rail, 2-Propulsion-rotation composite mechanism, 3-Clamping mechanism, 4-Support roller, 5-Bending roller, 6-Lifting roller lifting mechanism, 7-Lifting roller, 8-Clamping block, 9-Rotation-lifting and repositioning composite mechanism, 10-Forming roller slide rail, 11-Forming roller, 12-Bending mold, 13-Pressure roller, 14-Machine tool, 15-Rotation drive device. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0037] The present invention will now be described in further detail with reference to the accompanying drawings: See Figure 1The present invention provides a composite forming equipment for multi-roller push bending and CNC winding bending of a spiral tube with a very small pitch. The machine tool 14 is equipped with a multi-roller push bending forming unit, a CNC winding forming unit, a push-rotation composite unit, a rotation-lifting and shifting composite mechanism 9 and a clamping mechanism 3.

[0038] The propulsion-rotation composite unit is axially arranged with a clamping mechanism 3, a multi-roller push-bending forming unit, and a CNC bending forming unit. The multi-roller push-bending forming unit and the CNC bending forming unit share the propulsion-rotation composite unit and the clamping mechanism 3. The propulsion-rotation composite unit is located at the tail of the tube blank and is used for axial propulsion and rotation of the tube blank around its own axis. The CNC bending forming unit is located on one side of the discharge end of the multi-roller push-bending forming unit and is used to form local small-angle bending sections, small-radius bending sections, fixed-radius bending sections, or short-arc small-angle bending sections. The clamping mechanism 3 is used to clamp the tube blank and prevent axial instability. The rotation-lifting and switching composite mechanism 9 is used to switch the forming roller 11 in the multi-roller push-bending forming unit with the bending die 12 and clamping block 8 in the CNC bending forming unit between corresponding forming stations to achieve continuous composite forming between the extremely small pitch spiral section and the local bending section.

[0039] The propulsion-rotation composite unit includes a propulsion mechanism slide rail 1 and a propulsion-rotation composite mechanism 2 mounted on the propulsion mechanism slide rail 1. The propulsion-rotation composite mechanism 2 can move linearly along the propulsion mechanism slide rail 1 and continuously feed the tube blank along the tube axis. The propulsion function and the rotation function are integrated into the propulsion-rotation composite mechanism 2. The rotation function can drive the tube blank to rotate around its own axis to adapt to the multi-angle spatial posture requirements between the multi-roller push-bending forming section and the CNC winding forming section, and to avoid possible interference between the tube component and the forming component.

[0040] The multi-roll push-bending forming unit includes several arrays of support rollers 4, pressure rollers 13, bending rollers 5, forming rollers 11, and lifting rollers 7, as well as a lifting mechanism 6 for the lifting rollers. The pressure rollers 13 and bending rollers 5 are mounted on one side of the support rollers 4, arranged side-by-side. The support rollers 4, pressure rollers 13, and bending rollers 5 support, press, and guide the tube blank, and can rotate around their own axes during the multi-roll push-bending forming process. The forming roller 11 is mounted on the forming roller slide rail 10 and can move eccentrically along the tube forming direction to control the bending deformation of the tube blank. The lifting mechanism 6 provides the displacement and path of the lifting roller 7 to control the pitch value of the tube component. Furthermore, the lifting roller 7 can move actively to avoid potential interference. Through the synergistic effect of the forming roller 11 and the lifting roller 7, continuous push-bending forming of extremely small pitch spiral sections, spatial spiral sections, or bending-torsion coupled continuous spatial bending sections is achieved.

[0041] The CNC bending forming unit includes a bending die 12, a clamping block 8, and a rotary drive device 15. The bending die 12 serves as a forming reference in the CNC bending forming process, used to define the bending radius of the pipe. The bending die 12 is mounted on the clamping block 8, which is used to clamp the pipe section to be bent. The rotary drive device 15 is mounted on the bottom of the clamping block 8 and is used to drive the clamping block 8 to rotate around the central axis of the bending die 12, so that the pipe blank fits against the bending die 12 to form a preset bending angle, thereby completing the bending forming of local small-angle bending sections, local small-radius bending sections, fixed-radius bending sections, or short-arc small-angle bending sections.

[0042] The rotary-lifting transposition mechanism 9 enables rotary transposition and lifting movement. The forming roller slide rail 10 in the multi-roller push-bending forming unit and the bending die 12, clamping block 8, and rotary drive device 15 in the CNC bending forming unit are all mounted on the rotary-lifting transposition mechanism 9. The rotary-lifting transposition mechanism 9 is mounted on the machine tool 14 via a transposition mounting base. The transposition mounting base is equipped with a rotating component and a lifting component, driving the rotating and lifting components to move and rotate, thus switching between the multi-roller push-bending forming unit and the CNC bending forming unit. During multi-roller push-bending forming, the forming roller 11 enters the plane to be bent and participates in the push-bending forming as an active forming component, while the clamping block 8 and bending die 12 are in a clearance position. During CNC bending forming, the rotary-lifting transposition mechanism 9 rotates 90° counterclockwise. Figure 2 As shown, the clamping block 8 and bending die 12 enter the bending forming station to participate in bending forming, and the forming roller 11 exits the plane to be bent. When multi-roller push bending forming is required, the rotary-lifting switching compound mechanism 9 rotates 90° clockwise, as shown. Figure 3 As shown, the forming roller 11 is returned to the plane to be bent. The lifting assembly drives the rotary-lifting and repositioning composite mechanism 9 to move up and down in the vertical direction, which can adjust the position of each component on the rotary-lifting and repositioning composite mechanism 9 in the vertical direction to adapt to different pipe diameters or process requirements.

[0043] A transition positioning area is provided between the multi-roller push-bending forming unit and the CNC winding forming unit. The transition positioning area is used to form a clamping reserved section, tangent transition section or process transition section between the multi-roller push-bending forming section and the CNC winding forming section, so as to ensure that the tube blank has a stable clamping, positioning and attitude adjustment space when switching between the two types of forming stations.

[0044] This invention also provides a composite forming method for multi-roller bending and CNC bending of extremely small pitch spiral tubes, such as... Figure 4 As shown, it includes the following steps: Step 1: Place the tube blank to be formed on the machine tool 14. The clamping mechanism 3 clamps the tube blank, and the tail of the tube blank is clamped by the push-rotate composite mechanism 2. Step two: When the area to be formed is a spiral section with extremely small pitch, a spatial spiral section, or a continuous spatial curved section with bending-torsion coupling characteristics, the rotary-lifting and positioning composite mechanism 9 moves through the lifting assembly, causing the forming roller 11 to enter the multi-roller push-bending forming station, while the clamping block 8 and bending die 12 are in a clearance position; the push-rotation composite mechanism 2 pushes the tube blank continuously axially, the forming roller 11 makes eccentric movement in the Y-axis direction, and the lifting roller 7 makes lifting movement along the Z-axis direction under the action of the lifting roller lifting mechanism 6. The amount of movement of the forming roller 11 and the lifting roller 7 directly determines the bending radius and pitch of the spiral tube. The displacement of the forming roller 11 forces the tube blank, which is moving in a straight line, to produce lateral bending deformation. The bending radius is inversely proportional to the eccentric displacement of the forming roller; the lifting roller lifting mechanism 6 precisely controls the lifting rate and displacement amplitude of the lifting roller 7. The larger the displacement amplitude, the longer the distance the tube blank travels axially per revolution, and the larger the pitch. The tube blank is fed axially along the X-axis to the predetermined position, completing the forming of the spiral section area with extremely small pitch of the tube component; Step 3: The forming roller 11 moves in the Y direction and returns to its original equilibrium position; Step 4: When the area to be formed is a local small-angle bending section, a local small-radius bending section, a fixed-radius bending section, or a short-arc small-angle bending section, the rotary-lifting and repositioning composite mechanism 9 rotates 90° counterclockwise; at this time, the forming roller 11 exits the bending plane, and the clamping block 8 and the bending die 12 enter the CNC bending forming station.

[0045] Step 5: Under the action of the tail-propulsion-rotation composite mechanism 2, the tube blank rotates around its own axis to the preset forming plane, and is axially fed to the bending position as needed to achieve the forming of small-angle bending sections, small-radius bending sections, fixed-radius bending sections or short-arc small-angle bending sections under different planes. Step 6: Clamping block 8 clamps the pipe section to be bent, and the rotary drive device 15 drives clamping block 8 to rotate around the central axis of bending die 12, so that the pipe blank fits into bending die 12 to form a preset bending angle, thus completing the CNC bending forming. Step 7: The clamping block 8 returns to its original balanced position under the drive of the rotary drive device 15; Step 8: Rotate the rotary-lifting and repositioning compound mechanism 9 clockwise by 90° to return the forming roller 11 to the plane to be bent, and make the clamping block 8 and the bending die 12 exit the CNC bending forming station. Step 9: Based on the geometric characteristics of the target tube, repeat the forming process from Step 2 to Step 8 until the composite forming of the minimum pitch spiral tube and the locally bent section is completed. Step 10: Release the blank clamping mechanism 3 and remove the complex space tubular component. At this point, the forming process of the complex space tubular component is complete.

[0046] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A composite forming equipment for multi-roller bending and CNC bending of extremely small pitch spiral tubes, characterized in that, It includes a multi-roller push-bending forming unit, a CNC winding forming unit, a push-rotation composite unit, and a rotation-lifting and shifting composite mechanism (9). The multi-roller push bending forming unit and the CNC winding forming unit are set at one end of the axial direction of the push-rotation composite unit, the CNC winding forming unit is set on one side of the discharge end of the multi-roller push bending forming unit, and the CNC winding forming unit is installed on the rotation-lifting and shifting composite mechanism (9). The multi-roller bending forming unit is provided with several arrays of support rollers (4), lifting rollers (7) and forming rollers (11). On one side of the support rollers (4), bending rollers (5) and pressure rollers (13) are installed side by side. The lifting rollers (7) are installed on the machine tool (14), and the forming rollers (11) are installed on the rotary-lifting and shifting compound mechanism (9). The CNC bending forming unit is provided with a clamping block (8) and a bending die (12). The bending die (12) is installed at one end of the clamping block (8), and a gap is provided between the clamping block (8) and the other end of the bending die (12).

2. The composite forming equipment for multi-roller bending and CNC bending of ultra-small pitch spiral tubes according to claim 1, characterized in that, A clamping mechanism (3) is installed on the machine tool (14), and the clamping mechanism (3) is located between the propulsion-rotation composite unit and the multi-roller bending forming unit.

3. The composite forming equipment for multi-roller bending and CNC bending of ultra-small pitch spiral tubes according to claim 1, characterized in that, The propulsion-rotation composite unit is provided with a propulsion mechanism slide rail (1), and a propulsion-rotation composite mechanism (2) is provided on the propulsion mechanism slide rail (1).

4. The composite forming equipment for multi-roller bending and CNC bending of extremely small pitch spiral tubes according to claim 1, characterized in that, The lifting roller (7) is installed on the lifting roller lifting mechanism (6), and the lifting roller lifting mechanism (6) is installed on the machine tool (14).

5. The composite forming equipment for multi-roller bending and CNC bending of extremely small pitch spiral tubes according to claim 1, characterized in that, The rotary-lifting transposition composite mechanism (9) is mounted on the machine tool (14) via a transposition mounting base, on which a rotary component and a lifting component are mounted.

6. The composite forming equipment for multi-roller bending and CNC bending of extremely small pitch spiral tubes according to claim 1, characterized in that, The forming roller (11) is mounted on the forming roller slide rail (10), and the forming roller slide rail (10) is fixedly mounted on one side of the rotary-lifting and shifting compound mechanism (9).

7. The composite forming equipment for multi-roller bending and CNC bending of extremely small pitch spiral tubes according to claim 1, characterized in that, A transition positioning area is provided between the multi-roller push-bending forming unit and the CNC winding forming unit.

8. The composite forming equipment for multi-roller bending and CNC bending of extremely small pitch spiral tubes according to claim 1, characterized in that, A rotary drive device (15) is installed at the bottom of the clamping block (8) to drive the clamping block (8) to rotate around the central axis of the bending mold (12).

9. A method for composite forming of multi-roller bending and CNC bending of a small-pitch spiral tube using the equipment described in any one of claims 1 to 8, characterized in that, include: Place the tube blank to be formed on the machine tool (14). When the area to be formed is a spiral section with a very small pitch, a spatial spiral section, or a continuous spatial bending section with bending-torsion coupling characteristics, the rotation-lifting and repositioning compound mechanism (9) causes the forming roller (11) to enter the multi-roller push bending forming station, and the clamping block (8) and bending die (12) are in the avoidance position. The push-rotation composite unit clamps and pushes the tube blank for continuous axial feeding. The forming roller (11) makes eccentric motion and the lifting roller (7) makes lifting motion. The amount of motion of the forming roller (11) and the lifting roller (7) directly determines the bending radius and pitch of the coiled tube. The tube blank is moved to the predetermined position to complete the forming of the extremely small pitch spiral section of the tube component, and the forming roller (11) returns to the original equilibrium position; When the area to be formed is a local small-angle bending section, a local small-bending radius bending section, a fixed-radius bending section or a short-arc small-angle bending section, the rotary-lifting and repositioning compound mechanism (9) rotates 90° counterclockwise, the forming roller (11) exits the bending plane, and the clamping block (8) and bending die (12) enter the CNC bending forming station. Under the action of the propulsion-rotation composite unit, the tube blank rotates around its own axis to the preset forming plane and is axially fed to the bending position to achieve the forming of small-angle bending sections, small-radius bending sections, fixed-radius bending sections or short-arc small-angle bending sections under different planes. The clamping block (8) clamps the pipe section to be bent. The clamping block (8) rotates around the central axis of the bending die (12) so that the pipe blank fits the bending die (12) to form a preset bending angle, thus completing the CNC bending forming. The clamping block (8) returns to the original equilibrium position. The rotation-lifting and repositioning compound mechanism (9) rotates 90° clockwise so that the forming roller (11) returns to the plane to be bent and the clamping block (8) and the bending die (12) exit the CNC bending forming station. Based on the geometric characteristics of the target tube, repeat the above forming process until the composite forming of the extremely small pitch spiral tube and the locally bent section is completed. Then, remove the complex space tube component, and the forming process of the complex space tube component is completed.

10. The method for composite forming of multi-roller bending and CNC bending of a small-pitch spiral tube according to claim 9, characterized in that, The transition positioning area set between the multi-roll push-bending forming unit and the CNC winding forming unit forms a clamping reserved section, tangential transition section or process transition section between the multi-roll push-bending forming section and the CNC winding forming section, so that the tube blank can be switched and adjusted between the multi-roll push-bending forming station and the CNC winding forming station.

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