Aluminum alloy tube flanging apparatus and method

Abstract

The present application relates to the technical field of aluminum alloy pipe flanging, in particular to an aluminum alloy pipe flanging device and method, which comprises a workbench, a spinning unit for spinning the pipe edge, and a rotating unit for rotating the aluminum alloy pipe, a restraining mechanism for fixing the aluminum alloy pipe is arranged on the workbench, a shaping mechanism for shaping the inner hole after flanging is arranged on the restraining mechanism, a guide mechanism for guiding and limiting the aluminum alloy pipe during flanging is arranged on the workbench, the aluminum alloy pipe is limited and positioned by four rotating rollers which can move radially synchronously, during flanging, the two limiting wheels are controlled by the driving assembly to track the movement of the pipe edge, thereby realizing dynamic guiding and limiting of the pipe edge, after flanging is completed, the inner hole is high-precision trimmed by the shaping cone block, thereby the diameter and roundness of the inner hole formed after flanging are accurately controlled in one flanging operation, subsequent trimming is not needed, and the flanging efficiency is ensured.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy tube flanging technology, specifically to an aluminum alloy tube flanging device and method. Background Technology

[0002] In the connection and assembly process of aluminum alloy pipe fittings, pipe end flanging is an extremely important processing step. Among them, internal flanging is to bend the edge material of the pipe opening into the inside of the pipe fitting to form a flanging structure with a specific inner hole size.

[0003] Currently, aluminum tube spinning and internal flanging machines are one of the mainstream equipment for completing the internal flanging of aluminum alloy tubes. They replace the traditional stamping flanging with a progressive spinning forming method, which can effectively reduce mold costs and processing steps, and has significant advantages in the production of small and medium batches and multiple varieties of tube fittings.

[0004] Traditional aluminum tube spinning and turning machines mainly consist of a frame, a spindle drive system, a clamping mechanism, a spinning wheel assembly, and a feeding system. Their core working principle is as follows: one end of the aluminum alloy tube to be processed is clamped and fixed on the machine tool's rotating fixture, and the tube is driven by a spindle motor to rotate at high speed around its own axis. Driven by the feeding system, the spinning wheel assembly moves along the axial and radial directions of the tube, applying continuous pressure to the tube's edge with a smooth spinning wheel. Under the combined action of the tube's rotation and the spinning wheel's feed, the material at the tube's edge undergoes continuous localized plastic deformation, gradually bending and pushing it inwards, ultimately forming the desired inward-turned edge structure.

[0005] However, traditional aluminum tube spinning and turning machines still have obvious technical defects in actual use. The entire processing lacks a special structure to effectively shape and constrain the inner hole formed after turning. Due to the limited plastic forming performance of aluminum alloy material itself, the material in the turning area undergoes a complex tensile and compressive stress state during the spinning and turning process, which is prone to uneven plastic flow. As a result, it is difficult to accurately guarantee the diameter and roundness of the inner hole formed after turning.

[0006] In addition, the material has a certain elastic recovery after the flanging is completed, which further aggravates the deviation of the inner hole size. This problem of insufficient inner hole precision directly affects the subsequent assembly and connection quality and reliability of the pipe fittings. It has become a key bottleneck restricting the further improvement of the processing quality of aluminum tube spinning and flanging machine. Therefore, when it is necessary to accurately control the inner hole diameter and roundness after flanging, it is necessary to trim the aluminum alloy tube through subsequent processes after flanging, which seriously restricts the flanging efficiency.

[0007] Therefore, there is an urgent need to design an aluminum alloy tube flanging device and method that can dynamically guide and limit the tube edge during the flanging process and effectively shape the inner hole of the flanged tube after the flanging is completed. Summary of the Invention

[0008] In view of the above problems, embodiments of the present invention provide an aluminum alloy tube flanging device and method to solve the aforementioned technical problems.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: The first aspect of the present invention provides an aluminum alloy tube flanging device, including a worktable, a spinning unit for spinning the tube edge and a rotating unit for rotating the aluminum alloy tube are provided on the worktable, a constraint mechanism for fixing the aluminum alloy tube is provided on the worktable, a shaping mechanism for shaping the inner hole after flanging is provided on the constraint mechanism, and a guide mechanism for guiding and limiting the aluminum alloy tube during flanging is provided on the worktable.

[0010] The constraint mechanism includes a fixed frame that is fixedly installed on the workbench. Four rotating rollers are provided on the fixed frame through a connecting component. The rotating rollers move radially in sync to support the aluminum alloy tube.

[0011] The shaping mechanism includes a lifting frame that slides up and down on a fixed frame, and a shaping cone block is rotatably mounted on the lifting frame.

[0012] The guiding mechanism includes a cantilever frame fixedly installed on the workbench. Two limit wheel sets are provided on the cantilever frame through a drive assembly. The limit wheel sets are clamped to the pipe edge and move synchronously with the pipe edge when it is being turned over.

[0013] By dynamically limiting the edge of the aluminum alloy tube and finely finishing the inner hole of the aluminum alloy tube, a high-quality aluminum alloy tube flanging operation can be completed.

[0014] Preferably, the connecting assembly includes four roller frames that are radially slidably connected to the fixed frame, and the roller frames are rotatably connected to the corresponding rotating rollers.

[0015] Preferably, the four roller frames are slidably connected to a drive column on their inner sides, and an electric cylinder for pushing and pulling the drive column is fixedly installed on the lower side of the fixed frame.

[0016] Preferably, an electric cylinder two is fixedly installed on the lower side of the lifting frame, and the telescopic section of the electric cylinder two is fixedly connected to the fixed frame.

[0017] Preferably, the drive assembly includes a connecting frame that is slidably connected to the cantilever frame, and two symmetrically arranged movable arms are slidably connected to the lower part of the connecting frame. The lower ends of the movable arms are connected to corresponding limit wheel sets.

[0018] Preferably, an electric cylinder three is fixedly installed on the upper end of the cantilever frame, the telescopic section of the electric cylinder three is fixedly connected to the connecting frame, a double threaded rod one that is threadedly connected to the two moving arms is rotatably provided on the connecting frame, and a servo motor that drives the double threaded rod one is fixedly installed on the connecting frame.

[0019] Preferably, the limiting wheel assembly includes a wheel frame hinged to the movable arm, two symmetrically arranged movable blocks are slidably disposed on the wheel frame, and a clamping wheel is rotatably disposed on the lower side of the movable blocks.

[0020] Preferably, a double-threaded rod is rotatably mounted on the wheel frame. The angle of the double-threaded rod is locked by screws. The double-threaded rod is threadedly connected to the corresponding moving block. A pressure wheel is rotatably connected to the middle of the double-threaded rod.

[0021] Preferably, an electric cylinder four is fixedly installed on the connecting frame, and the telescopic section of the electric cylinder four is hinged to the corresponding wheel frame through two push-pull rods.

[0022] The second aspect of the present invention provides a method for flanging an aluminum alloy tube. The specific steps of the flanging method are as follows: S1, the aluminum alloy tube to be processed is sleeved on the outside of four rotating rollers, and the rotating rollers are pushed to expand radially outward synchronously through the connecting assembly, so as to support and rotate the aluminum alloy tube from the inside.

[0023] S2. After the aluminum alloy tube is positioned, the drive assembly drives two limit wheel sets to clamp the tube edge. The rotating unit is started to rotate the aluminum alloy tube. Then, the spinning unit contacts the edge of the tube opening to spin and flanging. At the same time, the drive assembly drives the two limit wheel sets to move synchronously with the tube edge, applying guidance and limitation to the aluminum alloy tube during the flanging process.

[0024] S3. After the flanging is completed, reset the limit wheel group, move the lifting frame upward so that the shaping cone block extends into the inner hole of the flanged aluminum alloy tube and rotates to squeeze, and rotates to shape the inner hole produced by the flanging.

[0025] S4. Withdraw the forming cone downwards, control the four rotating rollers to retract and loosen the aluminum alloy tube, and remove the processed aluminum alloy tube.

[0026] The beneficial effects of this invention are as follows: First, this invention uses four rotating rollers that can move radially in sync to limit the rotation of the aluminum alloy tube. During the flanging process, the drive assembly controls two limit wheel sets to track the movement of the tube edge, thereby achieving dynamic guidance and limiting of the tube edge. After the flanging is completed, the inner hole is precisely trimmed by a shaping cone block. Thus, the diameter and roundness of the inner hole formed after flanging can be precisely controlled in one flanging operation, eliminating the need for subsequent trimming and ensuring the efficiency of flanging.

[0027] Second, the present invention uses an electric cylinder to pull down the drive column, which simultaneously pushes the four roller frames outward, thereby causing the roller frames to drive the rotating rollers on them to abut against the inner side of the aluminum alloy tube, locking the aluminum alloy tube to a fixed axis. At the same time, the four rotating rollers can rotate with the aluminum alloy tube without hindering its rotation, thus facilitating the spinning and flanging of the aluminum alloy tube edge.

[0028] Third, this invention uses electric cylinder three to drive the clamping wheel to move vertically, servo motor and double threaded rod one to control the clamping wheel to move horizontally, and electric cylinder four to drive the wheel frame to swing through push-pull rod, so that the clamping wheel flips. Through the superposition of horizontal movement, vertical movement and flipping, the clamping wheel is guided and limited to the pipe edge in real time, so as to ensure the diameter accuracy of the inner hole.

[0029] Fourth, the present invention uses an electric cylinder to push the lifting frame upward, so that the lifting frame drives the shaping cone block to extend into the inner hole formed after flanging. Through the adaptive contact between the cone surface of the shaping cone block and the inner hole, the roundness deviation of the inner hole caused by uneven plastic flow and elastic recovery during the flanging process is corrected, thereby ensuring the dimensional accuracy and shape accuracy of the flanged inner hole. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of the connecting component, rotating roller, fixed frame and electric cylinder 1 in this invention;

[0033] Figure 3 This is a partial cross-sectional view of the rotating roller, roller frame, drive column and electric cylinder 1 in this invention;

[0034] Figure 4 This is a schematic diagram of the structure of the roller frame, lifting frame, fixing frame and electric cylinder II in this invention;

[0035] Figure 5 This is a schematic diagram of the structure of the mobile arm, servo motor, cantilever frame and double threaded rod in this invention;

[0036] Figure 6 This is a partial structural diagram of the connecting frame, servo motor, electric cylinder four, and clamping wheel in this invention;

[0037] Figure 7 This is a partial structural diagram of the wheel frame, push-pull rod, moving block and pressure wheel in this invention.

[0038] In the diagram: 1. Workbench; 2. Spinning unit; 3. Rotating unit; 4. Constraint mechanism; 5. Shaping mechanism; 6. Guide mechanism; 41. Fixed frame; 42. Connecting assembly; 43. Rotating roller; 51. Lifting frame; 52. Shaping cone block; 61. Cantilever frame; 62. Drive assembly; 63. Limit wheel set; 421. Roller frame; 422. Drive column; 423. Electric cylinder one; 511. Electric cylinder two; 621. Connecting frame; 622. Moving arm; 623. Electric cylinder three; 624. Double threaded rod one; 625. Servo motor; 631. Wheel frame; 632. Moving block; 633. Clamping wheel; 634. Double threaded rod two; 635. Pressing wheel; 636. Electric cylinder four; 637. Push-pull rod. Detailed Implementation

[0039] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0040] See Figure 1 , Figure 2 and Figure 5 An aluminum alloy tube flanging device includes a worktable 1, a spinning unit 2 for spinning the tube edge and a rotating unit 3 for rotating the aluminum alloy tube, a constraint mechanism 4 for fixing the aluminum alloy tube on the worktable 1, a shaping mechanism 5 for shaping the inner hole after flanging on the constraint mechanism 4, and a guide mechanism 6 for guiding and limiting the aluminum alloy tube during flanging on the worktable 1.

[0041] In this embodiment, both the spinning unit 2 and the rotating unit 3 adopt the common structure in traditional spinning and flanging machines. The rotating unit 3 rotates against the outer surface of the aluminum alloy tube, thereby driving the aluminum alloy tube to rotate synchronously. When the aluminum alloy tube rotates, the spinning unit 2 gradually approaches the upper part of the aluminum alloy tube, thereby applying continuous pressure to the edge of the tube opening, causing the material at the edge of the tube opening to undergo continuous local plastic deformation, and is gradually bent and pushed into the tube, ultimately forming the required inner flanging structure.

[0042] It should be noted that when the upper part of the fitting is bent inward, the upper edge of the original aluminum alloy tube is folded inward to form an inner hole, the diameter of which is smaller than the inner diameter of the aluminum alloy tube. When flanging, the operator puts the aluminum alloy tube to be flanged on the constraint mechanism 4, and the constraint mechanism 4 limits the rotation of the aluminum alloy tube to a fixed axis. Then, the flanging operation is performed by the spinning unit 2 and the rotating unit 3.

[0043] When a high precision of the inner diameter and a high requirement for the roundness of the inner hole are required, the guide mechanism 6 provides real-time guidance and constraint to the edge of the pipe opening during the flanging process to increase the precision of the inner diameter. After the flanging is completed, the forming mechanism 5 shapes the flanged inner hole at the original station to improve the roundness of the inner hole.

[0044] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The constraint mechanism 4 includes a fixed frame 41 fixedly installed on the workbench 1. Four rotating rollers 43 are provided on the fixed frame 41 through the connecting assembly 42. The rotating rollers 43 move radially in sync to support the aluminum alloy tube.

[0045] Before flanging, the operator places the aluminum alloy tube together on the outside of the four rotating rollers 43. The four rotating rollers 43 are moved radially outward synchronously through the connecting component 42, so that the four rotating rollers 43 all abut against the inner side of the aluminum alloy tube. Thus, the aluminum alloy tube is fixed and limited by the inner support of the four rotating rollers 43. Because the rotating rollers 43 are in rolling contact with the aluminum alloy tube, the aluminum alloy tube can rotate freely while being limited, which facilitates the spinning and flanging of the aluminum alloy tube.

[0046] See Figure 1 , Figure 5 and Figure 6 The guide mechanism 6 includes a cantilever frame 61 fixedly installed on the workbench 1. Two limit wheel sets 63 are provided on the cantilever frame 61 through the drive assembly 62. The limit wheel sets 63 are clamped on the pipe edge and move synchronously with the pipe edge when it is being turned.

[0047] Before the rotating unit 3 rotates the aluminum alloy tube, the driving component 62 moves two limiting wheel sets 63 to clamp the tube edge. The two limiting wheel sets 63 are clamped at two symmetrical positions on the tube edge, and the limiting wheel sets 63 are in rolling contact with the aluminum alloy tube. When the aluminum alloy tube is being flanged, the driving component 62 drives the two limiting wheel sets 63 to perform a composite movement of horizontal, vertical and flipping at the same time, so as to realize the synchronous movement of the limiting wheel sets 63 and the flanged edge of the aluminum alloy tube. By actively controlling the movement trajectory of the two limiting wheel sets 63, the active control of the flanged edge of the aluminum alloy tube is realized, thereby guiding and constraining the diameter of the inner hole formed after flanging, and improving the accuracy of the inner hole diameter.

[0048] See Figure 1 , Figure 2 and Figure 4 The shaping mechanism 5 includes a lifting frame 51 that is slidably mounted on a fixed frame 41, and a shaping cone 52 that is rotatably mounted on the lifting frame 51.

[0049] After the flanging is completed, the aluminum alloy tube continues to rotate, and the two limit wheel sets 63 are moved up and reset. Then the lifting frame 51 is moved up, so that the lifting frame 51 drives the shaping cone block 52 to extend into the inner hole formed after flanging. Through the adaptive contact between the conical surface of the shaping cone block 52 and the inner hole, the roundness deviation of the inner hole caused by uneven plastic flow and elastic recovery during the flanging process is corrected, thereby ensuring the dimensional accuracy and shape accuracy of the flanged inner hole.

[0050] To facilitate the synchronous movement of the four rotating rollers 43, enabling them to expand and contract radially in sync, the present invention employs the following structure: (See attached diagram) Figure 1 , Figure 2 , Figure 3 and Figure 4 The connecting assembly 42 includes four roller frames 421 that are radially slidably connected to the fixed frame 41, and the roller frames 421 are rotatably connected to the corresponding rotating rollers 43.

[0051] See Figure 2 , Figure 3 and Figure 4 The inner sides of the four roller frames 421 are inclined and slidably connected to the drive column 422. The lower side of the fixed frame 41 is fixedly installed with the electric cylinder 423 that pushes and pulls the drive column 422. The lower side of the lifting frame 51 is fixedly installed with the electric cylinder 511. The telescopic section of the electric cylinder 511 is fixedly connected to the fixed frame 41.

[0052] When internal support is needed for the aluminum alloy tube, the telescopic section of the electric cylinder 423 is retracted, causing the electric cylinder 423 to pull the drive column 422 downward. This causes the drive column 422 to push the four roller frames 421 outward in sync, which in turn causes the four roller frames 421 to drive the four rotating rollers 43 to move outward, thus providing internal support for the aluminum alloy tube. After the flanging is completed, the telescopic section of the electric cylinder 423 is extended, causing the four rotating rollers 43 to retract inward and reset.

[0053] When it is necessary to adjust the roundness of the inner hole after flanging, the telescopic section of the extended electric cylinder 511 drives the lifting frame 51 to move upward, so that the lifting frame 51 drives the conical surface of the shaping cone block 52 to make adaptive contact with the inner hole, thereby correcting the roundness deviation of the inner hole caused by uneven plastic flow and elastic recovery during the flanging process, thus ensuring the dimensional accuracy and shape accuracy of the flanged inner hole.

[0054] To facilitate synchronous movement of the clamping wheel 633 with the edge of the aluminum alloy tube, the present invention designs the following structure: (See attached diagram) Figure 1 , Figure 5 , Figure 6 and Figure 7The drive assembly 62 includes a connecting frame 621 that is slidably connected to the cantilever 61. Two symmetrically arranged movable arms 622 are slidably connected to the lower part of the connecting frame 621. The lower end of the movable arms 622 is connected to the corresponding limiting wheel set 63. The limiting wheel set 63 includes a wheel frame 631 that is hinged to the movable arm 622. Two symmetrically arranged movable blocks 632 are slidably arranged on the wheel frame 631. A clamping wheel 633 is rotatably arranged on the lower side of the movable block 632.

[0055] The connecting frame 621 is moved downward, so that the connecting frame 621 drives the wheel frame 631 to move downward through the moving arm 622. The wheel frame 631 drives the clamping wheel 633 to move to the edge of the aluminum alloy tube through the moving block 632, so that the two clamping wheels 633 on the same wheel frame 631 abut against the inner and outer surfaces of the aluminum alloy tube respectively, thereby clamping and limiting the edge of the aluminum alloy tube.

[0056] During the flanging process, the moving arms 622 move closer to or further away from each other, causing the moving arms 622 to drive the clamping wheels 633 to move horizontally via the wheel frame 631. The connecting frame 621 moves up and down, causing the connecting frame 621 to drive the clamping wheels 633 to move vertically in sync via the moving arms 622. The wheel frame 631 is flipped, causing the wheel frame 631 to drive the clamping wheels 633 to flip synchronously. Thus, through the superimposed movements of horizontal movement, vertical movement, and flipping of the clamping wheels 633, the clamping wheels 633 are guided and limited in real time to the edge of the pipe, ensuring the diameter accuracy of the inner hole.

[0057] To facilitate the vertical movement of the connecting frame 621, the present invention designs the following structure: (See attached diagram) Figure 5 , Figure 6 and Figure 7 An electric cylinder 623 is fixedly installed on the upper end of the cantilever frame 61. The telescopic section of the electric cylinder 623 is fixedly connected to the connecting frame 621. The movement of the telescopic section of the electric cylinder 623 drives the connecting frame 621 to move vertically, so that the connecting frame 621 drives the clamping wheel 633 to move up and down synchronously.

[0058] To facilitate the horizontal movement of the connecting frame 621, the present invention designs the following structure: (Continue reading) Figure 5 , Figure 6 and Figure 7 The connecting frame 621 is rotatably provided with a double threaded rod 624 that is threadedly connected to the two moving arms 622. The connecting frame 621 is fixedly mounted with a servo motor 625 that drives the double threaded rod 624. The output shaft of the servo motor 625 is fixedly mounted with a drive pulley, and the double threaded rod 624 is fixedly mounted with a driven pulley. The drive pulley and the driven pulley are both wound with a belt.

[0059] The servo motor 625 is started to drive the double threaded rod 624 to rotate, which in turn drives the two moving arms 622 to move synchronously and symmetrically, and the moving arms 622 drive the clamping wheel 633 to move horizontally synchronously.

[0060] To facilitate the flipping of the clamping wheel 633, the present invention designs the following structure: (continue reading) Figure 5 , Figure 6 and Figure 7 An electric cylinder 636 is fixedly installed on the connecting frame 621. The telescopic section of the electric cylinder 636 is hinged to the corresponding wheel frame 631 through two push-pull rods 637. When flipping, the electric cylinder 636 flips the wheel frame 631 through the telescopic section of the electric cylinder 636 via the two push-pull rods 637, thereby causing the wheel frame 631 to drive the clamping wheel 633 to flip synchronously.

[0061] To accommodate aluminum alloy tubes of varying thicknesses, this invention features the following structure: (See attached document for further details) Figure 5 , Figure 6 and Figure 7 A double threaded rod 634 is rotatably mounted on the wheel frame 631. The angle of the double threaded rod 634 is locked by screws. The double threaded rod 634 is threadedly connected to the corresponding moving block 632. A pressure wheel 635 is rotatably connected to the middle of the double threaded rod 634.

[0062] In this embodiment, the lower part of the clamping wheel 633 has a conical structure, which allows the clamping wheel 633 to be smoothly inserted into the tube wall position of the aluminum alloy tube when the connecting frame 621 moves downward. By manually rotating the double threaded rod 634 in advance, the double threaded rod 634 drives the two moving blocks 632 at the corresponding positions to move closer or further away from each other, so that the moving blocks 632 drive the clamping wheel 633 on them to move synchronously, thereby achieving adaptation to tube walls of different thicknesses. When clamping and limiting the aluminum alloy tube, the pressure wheel 635 abuts against the tube opening position.

[0063] In addition, the present invention also provides a method for flanging aluminum alloy tubes. The flanging method has the following steps: S1, the aluminum alloy tube to be processed is sleeved on the outside of four rotating rollers 43. The driving column 422 is pulled down by the electric cylinder 511, so that the driving column 422 moves the rotating rollers 43 radially outward, so that the rotating rollers 43 support and rotate the aluminum alloy tube from the inside.

[0064] S2. After the aluminum alloy tube is positioned, the connecting frame 621 is moved downwards, so that the connecting frame 621 drives the two clamping wheels 633 to clamp the tube side. The rotating unit 3 is started to rotate the aluminum alloy tube. Then the spinning unit 2 contacts the edge of the tube opening to spin and flip the tube. At the same time, it drives the two clamping wheels 633 to move synchronously with the tube side, applying guidance and limitation to the aluminum alloy tube during the flipping process.

[0065] S3. After the flanging is completed, reset the two clamping wheels 633, move the lifting frame 51 upward so that the shaping cone 52 extends into the inner hole of the flanged aluminum alloy tube and rotates to squeeze, and rotates to shape the inner hole produced by the flanging.

[0066] S4. Withdraw the forming cone 52 downwards, control the four rotating rollers 43 to retract and loosen the aluminum alloy tube, and remove the processed aluminum alloy tube.

[0067] Although this invention adds structures such as a fixed frame 41, rotating rollers 43, lifting frame 51, forming cone block 52, and cantilever frame 61 to the existing spinning and flanging machine, which increases the initial manufacturing cost of the equipment compared to the traditional aluminum tube spinning and flanging machine, this invention achieves fixed-axis rotation limit of the aluminum alloy tube through the synchronous radial expansion of the four rotating rollers 43. Combined with the horizontal, vertical, and flipping compound movement of the clamping wheel 633, it provides real-time active guidance and constraint for the tube edge during the flanging process, which significantly improves the diameter accuracy of the inner hole after flanging.

[0068] Meanwhile, by extending the shaping cone 52 into the inner hole for adaptive contact trimming, the problem of inner hole roundness deviation after flanging is effectively solved. Therefore, although the equipment investment cost increases slightly, for aluminum alloy tube processing scenarios with high requirements for inner hole diameter accuracy and roundness, this invention can quickly achieve a balance of benefits and has significant comprehensive economic benefits and industrial application value.

[0069] It should be noted that this invention is mainly aimed at processing scenarios with high requirements for the diameter and roundness of the inner hole of the flange. Under such requirements, this device can give full play to its technical advantages. For flange processing with conventional accuracy requirements, the shaping and guiding process can be omitted or traditional equipment can be selected. Those skilled in the art can flexibly choose according to actual processing needs.

[0070] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0071] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0072] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0073] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An aluminum alloy tube flanging device, comprising a worktable, a spinning unit for spinning tube edges arranged on the worktable, and a rotating unit for rotating the aluminum alloy tube, characterized in that, The workbench is equipped with a constraint mechanism to fix the aluminum alloy tube, a shaping mechanism to shape the inner hole after flanging, and a guide mechanism to guide and limit the aluminum alloy tube during flanging. The constraint mechanism includes a fixed frame that is fixedly installed on the workbench. Four rotating rollers are provided on the fixed frame through a connecting component. The rotating rollers move radially in sync to support the aluminum alloy tube. The shaping mechanism includes a lifting frame that is slidably mounted on a fixed frame, and a shaping cone block is rotatably mounted on the lifting frame; The guiding mechanism includes a cantilever frame fixedly installed on the workbench. Two limit wheel sets are provided on the cantilever frame through a drive assembly. The limit wheel sets are clamped to the pipe edge and move synchronously with the pipe edge when it is being flanged. The flanging operation is completed by dynamically limiting the edge of the aluminum alloy tube and by finely finishing the inner hole of the aluminum alloy tube.

2. The aluminum alloy tube flanging device according to claim 1, characterized in that, The connecting assembly includes four roller frames that are radially slidably connected to a fixed frame, and the roller frames are rotatably connected to corresponding rotating rollers.

3. The aluminum alloy tube flanging device according to claim 2, characterized in that, The four roller frames are slidably connected to a drive column on their inner sides, and an electric cylinder for pushing and pulling the drive column is fixedly installed on the lower side of the fixed frame.

4. The aluminum alloy tube flanging device according to claim 1, characterized in that, An electric cylinder two is fixedly installed on the lower side of the lifting frame, and the telescopic section of the electric cylinder two is fixedly connected to the fixed frame.

5. The aluminum alloy tube flanging device according to claim 1, characterized in that, The drive assembly includes a connecting frame that is slidably connected to the cantilever frame. Two symmetrically arranged movable arms are slidably connected to the lower part of the connecting frame, and the lower ends of the movable arms are connected to corresponding limit wheel sets.

6. The aluminum alloy tube flanging device according to claim 5, characterized in that, An electric cylinder three is fixedly installed on the upper end of the cantilever frame. The telescopic section of the electric cylinder three is fixedly connected to the connecting frame. A double threaded rod one that is threadedly connected to the two moving arms is rotatably installed on the connecting frame. A servo motor that drives the double threaded rod one is fixedly installed on the connecting frame.

7. The aluminum alloy tube flanging device according to claim 5, characterized in that, The limiting wheel assembly includes a wheel frame hinged to a movable arm, with two symmetrically arranged movable blocks slidably mounted on the wheel frame, and a clamping wheel rotatably mounted on the underside of each movable block.

8. The aluminum alloy tube flanging device according to claim 7, characterized in that, A double-threaded rod is rotatably mounted on the wheel frame. The angle of the double-threaded rod is locked by screws. The double-threaded rod is threadedly connected to the corresponding moving block. A pressure wheel is rotatably connected to the middle of the double-threaded rod.

9. The aluminum alloy tube flanging device according to claim 7, characterized in that, The connecting frame is fixedly installed with an electric cylinder four, and the telescopic section of the electric cylinder four is hinged to the corresponding wheel frame through two push-pull rods.

10. A method for flanging aluminum alloy tubes, using the aluminum alloy tube flanging device according to any one of claims 1 to 9, characterized in that, The specific steps for the flanging method are as follows: S1. The aluminum alloy tube to be processed is sleeved on the outside of four rotating rollers. The rotating rollers are pushed to expand radially outward synchronously through the connecting assembly, which supports and limits the rotation of the aluminum alloy tube from the inside. S2. After the aluminum alloy tube is positioned, the drive assembly drives two limit wheel sets to clamp the tube edge. The rotating unit is started to rotate the aluminum alloy tube. Then, the spinning unit contacts the edge of the tube opening to spin and flanging. At the same time, the drive assembly drives the two limit wheel sets to move synchronously with the tube edge, applying guidance and limitation to the aluminum alloy tube during the flanging process. S3. After the flanging is completed, reset the limit wheel group, move the lifting frame up so that the shaping cone block extends into the inner hole of the flanged aluminum alloy tube and rotates to squeeze, and rotates to shape the inner hole produced by the flanging. S4. Withdraw the forming cone downwards, control the four rotating rollers to retract and loosen the aluminum alloy tube, and remove the processed aluminum alloy tube.

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