Aluminum alloy thin-wall profile shaping device

By designing an aluminum alloy thin-wall profile shaping device including base, press plate, support plate, rough frame, finish frame, protective cover, transmission system and vacuum cleaner groove, the problem of unstable size and twisting degree during the extrusion process of the existing device is solved, and the working environment is improved through protective measures, achieving efficient and precise shaping effect.

CN119634492APending Publication Date: 2025-03-18ASIA PACIFIC LIGHT ALLOY NANTONG TECH
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Patent Information

Application Number
CN202411899201.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

During the extrusion process, the existing aluminum alloy thin-wall profile shaping device has caused large changes in product size or excessive twisting and twisting to meet customer needs due to factors such as speed, temperature and cooling speed during the extrusion process, which has caused flying chips to affect the surrounding environment and cannot meet daily use needs.

Method used

Aluminum alloy thin-wall profile shaping device is designed, including base, pressing plate, support plate, rough frame, finishing frame, protective cover, transmission system and vacuum cleaner groove. Through the coordinated work of these components, efficient shaping and precise adjustment of aluminum alloy thin-wall profiles is achieved to prevent flying chips from affecting the environment.

Benefits of technology

By accurately adjusting the position of the support plate and roller, the device improves the product dimensional accuracy, reduces the twisting and twisting, meets the high-precision needs, and effectively prevents the influence of flying chips through protective covers and vacuum cleaner grooves, improving the working environment.

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Abstract

The invention relates to the technical field of aluminum alloy profile reshaping, in particular to an aluminum alloy thin-wall profile reshaping device which comprises a base, a pressing plate is fixedly connected to the surface of the base, a supporting plate is fixedly connected to the center of the surface of the pressing plate, a roughing machine frame is arranged on the front face of the supporting plate, and a finishing machine frame is arranged on the back face of the base. The bottom end of the base is fixedly connected with an overhead seat, one side of the surface of the overhead seat is movably connected with a first protective cover, and the other side of the surface of the overhead seat is movably connected with a second protective cover. A base, a pressing plate, a supporting plate, a roughing machine frame, a finishing machine frame, a left-right adjusting bolt, a roughing upper roller, a roughing lower roller, a roughing up-down adjusting bolt, a roughing angle adjusting bolt, a 45, a finishing upper roller, a finishing lower roller and a finishing up-down adjusting bolt are arranged; and the whole equipment can be more adaptively and efficiently used for immediately shaping the aluminum alloy thin-wall section bar after extruding the aluminum alloy thin-wall section bar.
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Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloy profile shaping, in particular to an aluminum alloy thin-wall profile shaping device. Background Art

[0002] Aluminum alloy profiles have been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, construction, decoration, and chemical industries. With the rapid development of science and technology and industrial economy in recent years, the demand for aluminum alloy welded structural parts has increased, which has led to in-depth research on the weldability of aluminum alloys. The wide application of aluminum alloys has promoted the development of aluminum alloy welding technology. At the same time, the development of welding technology has expanded the application field of aluminum alloys. Therefore, aluminum alloy welding technology is becoming one of the research hotspots. Aluminum alloy pipes have been widely used in automobile heat exchange systems, household air-conditioning systems and other fields due to their low density, good corrosion resistance and good processing performance. Aluminum alloy thin-walled profiles are important structural materials for modern automobiles and aviation equipment. They have high requirements on the dimensional accuracy and performance of the products. Aluminum alloy thin-walled profiles are generally manufactured by hot extrusion. The main production process is to heat the aluminum alloy round ingot to a certain temperature, put it into the extrusion barrel, and form it through a mold under the pressure of the extrusion rod.

[0003] For example, the patent document with the announcement number CN 118002647 B discloses an aluminum alloy profile twisting and shaping device, including a platform, a first correction component, a second correction component and a middle correction component. The present invention can correct a longer aluminum alloy profile by designing the first correction component, the second correction component and the middle correction component located between the first correction component and the second correction component and being able to slide between the first correction component and the second correction component, and the middle correction component can be corrected and manipulated at any position in the first correction component and the second correction component without restriction, so that the aluminum alloy profile can be corrected better and more conveniently. Compared with the aluminum profile shaping machine currently used, it has the advantages of low equipment cost, easy use and high processing efficiency.

[0004] However, due to the limitations of its own structure, the existing structure often causes the product size, especially the opening size of the thin-walled profile to change greatly, or the profile twisting degree to change greatly due to the influence of many factors such as extrusion speed, extrusion temperature, cooling speed, etc. during the extrusion process, and cannot meet the customer's use requirements. At the same time, the existing structure usually adopts an open processing design, which causes the flying chips generated during the shaping of the aluminum alloy thin-walled profile to affect the surrounding environment. Similarly, the unshielded working environment will also be affected by the surrounding environment on the shaping of the aluminum alloy thin-walled profile, and cannot meet daily use needs. Therefore, it is urgent to design an aluminum alloy thin-walled profile shaping device to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide an aluminum alloy thin-walled profile shaping device to solve the problem that the existing structure mentioned in the above background technology is limited by its own structure. When it is affected by many factors such as extrusion speed, extrusion temperature, cooling speed, etc. during the extrusion process, the size of the product, especially the opening size of the thin-walled profile, often changes greatly, or the profile twists greatly, which cannot meet the customer's usage requirements. At the same time, the existing structure usually adopts an open processing design, which leads to the flying chips generated during the shaping of the aluminum alloy thin-walled profile that will affect the surrounding environment. Similarly, the unshielded working environment will also be affected by the surrounding environment on the shaping of the aluminum alloy thin-walled profile, and cannot meet the daily usage requirements.

[0006] To achieve the above object, the present invention provides the following technical solution: an aluminum alloy thin-walled profile shaping device, comprising a base, a pressing plate is fixedly connected to the surface of the base, a support plate is fixedly connected to the center of the surface of the pressing plate, a roughing frame is arranged on the front of the support plate, and a finishing frame is arranged on the back of the base;

[0007] An overhead seat, the bottom end of the base is fixedly connected to the overhead seat, one side of the surface of the overhead seat is movably connected to a first protective cover, the other side of the surface of the overhead seat is movably connected to a second protective cover, a side of the first protective cover and the second protective cover away from each other is fixedly connected to a feed rack, a feed trough is provided inside the feed rack, fixed brackets are fixedly connected to the centers of both sides of the overhead seat, both sides of the fixed brackets are fixedly connected to limiting slides, one end of the fixed bracket and the limiting slide is fixedly connected to a transmission frame, and a driving motor is provided at one end of the transmission frame.

[0008] Preferably, a transmission belt is provided at one end of the driving motor, and both ends of the transmission belt are fixedly connected to a first reciprocating screw, one end of the first reciprocating screw is fixedly connected to a central rotating shaft, and one end of the central rotating shaft is provided with a second reciprocating screw, and the first reciprocating screw and the second reciprocating screw have opposite directions.

[0009] Preferably, both ends of the bottom of the first protective cover and the second protective cover are fixedly connected to limit sliders, and the bottom end of the limit slider is provided with a sliding sleeve.

[0010] Preferably, a first dust collection net groove is provided on a side of the first protective cover and the second protective cover that are close to each other, and a second dust collection net groove is provided on the inner wall of the first protective cover and the second protective cover.

[0011] Preferably, left and right adjustment bolts are arranged inside the support plate.

[0012] Preferably, a roughing upper roller is arranged at the top of the roughing frame, a roughing lower roller is arranged at the bottom of the roughing frame, roughing upper and lower adjustment bolts are arranged on one side of the top of the support plate, and a roughing angle adjustment bolt is arranged at the top of the roughing frame.

[0013] Preferably, an upper finishing roller is provided at the inner top end of the finishing frame, a lower finishing roller is provided at the inner bottom end of the finishing frame, and upper and lower finishing adjustment bolts are provided at the top end of the finishing frame.

[0014] Preferably, the roughing frame and the finishing frame are respectively adapted to the support plate.

[0015] Preferably, the base is adapted to fit between the first protective cover and the second protective cover.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The aluminum alloy thin-walled profile shaping device, through the arranged base, pressing plate, supporting plate, roughing frame, finishing frame, left and right adjusting bolts, roughing upper roller, roughing lower roller, roughing up and down adjusting bolts, roughing angle adjusting bolts, 45, finishing upper roller, finishing lower roller and finishing up and down adjusting bolts, can make the equipment as a whole more adaptable and efficient to realize the immediate shaping of aluminum alloy thin-walled profiles after extrusion, improve the dimensional accuracy of the product, and meet the assembly needs of the automobile and aviation industries. In actual use, the shaping mechanism is mainly composed of a base, a pressing plate, a supporting plate, a roughing frame and a finishing frame. There are screw holes on the base, and the mechanism can be installed on the outlet of the extruder. The supporting plate can adjust the left and right adjusting bolts, the roughing frame can adjust the roughing up and down adjusting bolts, and the finishing frame can adjust the finishing up and down adjusting bolts. The left and right position of the support plate, the upper and lower position values ​​of the roughing device, and the upper and lower position of the finishing device can be adjusted respectively, so as to ensure that the profile shaping position is in the same center as the die discharge position of the extruder. On the center line, the roughing frame and the finishing frame are composed of two upper and lower rollers. The shapes of the roughing upper roller and the finishing upper roller are consistent with the inner shape of the profile, and the shapes of the roughing lower roller and the finishing lower roller are consistent with the outer surface shape of the profile. During shaping, the extruded profile passes between the roughing upper roller and the finishing upper roller and the roughing lower roller and the finishing lower roller. Under the clamping of the rollers, the profile is deformed to obtain the required shape to achieve the purpose of shaping. When the profile size accuracy requirement is low, only one set of rollers can be used. When the profile size accuracy requirements are high, two sets of rollers can be used for shaping. When the profile has a certain twist and cannot meet the design requirements, the roughing angle adjustment bolts on the roughing frame can be adjusted to rotate the roughing frame to a certain angle to form a certain angle between the roughing frame and the finishing frame. When the profile passes through the two sets of rollers, torsional deformation occurs, thereby adjusting the twisting deformation of the profile, meeting the rich needs of daily shaping of aluminum alloy thin-walled profiles, and reflecting the practicality of the equipment design.

[0018] The aluminum alloy thin-walled profile shaping device further improves the overall use effect of the equipment by arranging an overhead seat, a first protective cover, a second protective cover, a feed frame, a feed trough, a fixed bracket, a limit slide, a transmission frame, a drive motor, a transmission belt, a first reciprocating screw rod, a central rotating shaft, a second reciprocating screw rod, a limit slide block, a sliding shaft sleeve, a first dust suction net groove and a second dust suction net groove. In daily use, the staff can start the drive motor at one end of the transmission frame to drive the transmission belt and the first reciprocating screw rods at both ends to rotate synchronously. At this time, one end of the first reciprocating screw rod also rotates synchronously through the second reciprocating screw rods at both ends of the central rotating shaft, and then the first reciprocating screw rod and the second reciprocating screw rod are rotated to cooperate with the first protective cover and the second protective cover at both ends of the bottom The limiting slider and the sliding sleeve are used to adjust the first protective cover and the second protective cover as a whole to and fro. At this time, the first protective cover and the second protective cover can respectively perform adaptive cover connection and protection operations on the rough finishing frame and the finishing frame on the front and back sides of the support plate, thereby effectively ensuring that the interior of the rough finishing frame and the finishing frame will not be affected by the surrounding environment when the aluminum alloy thin-walled profile is being shaped. Usually, after the first protective cover and the second protective cover are connected, the first dust suction net groove therebetween and the second dust suction net groove in the center of the inner wall can be used to perform synchronous chip suction operations. Then, the first protective cover and the second protective cover cooperate with the feed racks and feed troughs on the front and back sides to perform rapid feeding and unloading of aluminum alloy thin-walled profiles, which reflects the comprehensiveness of the equipment design. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a front schematic diagram of the base structure of the present invention;

[0021] Figure 3 It is a schematic diagram of the back side of the base structure of the present invention;

[0022] Figure 4 is an overall schematic diagram of the first protective cover structure of the present invention;

[0023] Figure 5 It is an overall schematic diagram of the driving motor structure of the present invention;

[0024] Figure 6 For the present invention Figure 1 A magnified schematic diagram of the structure at center A;

[0025] Figure 7 For the present invention Figure 1 A magnified schematic diagram of the structure at B in the figure.

[0026] In the figure: 1. base; 2. pressure plate; 3. support plate; 31. left and right adjustment bolts; 4. roughing frame; 41. roughing upper roller; 42. roughing lower roller; 43. roughing up and down adjustment bolts; 44. roughing angle adjustment bolts; 5. finishing frame; 51. finishing upper roller; 52. finishing lower roller; 53. finishing up and down adjustment bolts; 6. overhead seat; 7. first protective cover; 8. second protective cover; 9. feed rack; 10. feed trough; 11. fixed bracket; 12. limit slide; 13. transmission frame; 14. drive motor; 15. transmission belt; 16. first reciprocating screw; 17. central shaft; 18. second reciprocating screw; 19. limit slide; 20. sliding sleeve; 21. first dust suction net slot; 22. second dust suction net slot. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-7 , an embodiment provided by the present invention:

[0029] A thin-walled aluminum alloy profile shaping device comprises a base 1, a pressing plate 2 is fixedly connected to the surface of the base 1, a support plate 3 is fixedly connected to the center of the surface of the pressing plate 2, a roughing frame 4 is arranged on the front of the support plate 3, a finishing frame 5 is arranged on the back of the base 1, left and right adjusting bolts 31 are arranged inside the support plate 3, a roughing upper roller 41 is arranged at the top of the roughing frame 4, a roughing lower roller 42 is arranged at the bottom of the roughing frame 4, a roughing upper and lower adjusting bolt 43 is arranged on one side of the top of the support plate 3, a roughing angle adjusting bolt 44 is arranged at the top of the roughing frame 4, a finishing upper roller 51 is arranged at the top of the finishing frame 5, a finishing lower roller 52 is arranged at the bottom of the finishing frame 5, and a finishing frame 5 is provided with a top and a bottom. The end is provided with finishing upper and lower adjusting bolts 53, the roughing frame 4 and the finishing frame 5 are respectively matched with the support plate 3, the base 1 is matched with the first protective cover 7 and the second protective cover 8, the upper and lower rollers are generally made of high-strength nylon material, which can avoid damaging the surface of the aluminum profile. By changing the shape of the upper and lower rollers, the typical shape of the product that can be shaped by this device is as follows, and by reasonably designing the shape of the rollers, the profiles with more complex cross-sectional shapes can also be shaped. The profile should be pulled through the device by a traction machine, and the roller can also be driven by a motor to pull the profile forward. In this case, the motor speed should be consistent with the profile extrusion speed to reduce the sliding of the roller and the profile when the speed is consistent, thereby damaging the profile surface.

[0030] An overhead seat 6 is fixedly connected to the bottom end of the base 1, a first protective cover 7 is movably connected to one side of the surface of the overhead seat 6, a second protective cover 8 is movably connected to the other side of the surface of the overhead seat 6, a feed frame 9 is fixedly connected to the side away from the first protective cover 7 and the second protective cover 8, a feed trough 10 is provided inside the feed frame 9, a fixed bracket 11 is fixedly connected to the center of both sides of the overhead seat 6, a limited slide 12 is fixedly connected to both sides of the fixed bracket 11, a transmission frame 13 is fixedly connected to one end of the fixed bracket 11 and the limited slide 12, a driving frame 13 is provided at one end of the driving frame 13, a driving motor 14 is provided at one end of the driving motor 14, a driving belt 15 is fixedly connected to both ends of the driving belt 15, a first reciprocating screw rod 16 is fixedly connected to one end of the first reciprocating screw rod 16, a central shaft 17 is fixedly connected to one end of the central shaft 17, and a second The reciprocating screw rod 18, the first reciprocating screw rod 16 and the second reciprocating screw rod 18 move in opposite directions, the first protective cover 7 and the second protective cover 8 are fixedly connected to the limiting slider 19 at both ends of the bottom, and the bottom end of the limiting slider 19 is provided with a sliding sleeve 20, and the first protective cover 7 and the second protective cover 8 are provided with a first dust suction net groove 21 on the side close to each other, and the inner wall of the first protective cover 7 and the second protective cover 8 is provided with a second dust suction net groove 22. The first reciprocating screw rod 16 and the second reciprocating screw rod 18 are rotated to cooperate with the limiting slider 19 and the sliding sleeve 20 at both ends of the bottom of the first protective cover 7 and the second protective cover 8 to perform the back and forth adjustment operation of the first protective cover 7 and the second protective cover 8 as a whole. At this time, the first protective cover 7 and the second protective cover 8 can respectively perform adaptive cover connection protection operations on the rough finishing frame 4 and the finishing frame 5 on the front and back sides of the support plate 3.

[0031] Working principle: When in use, the shaping mechanism is mainly composed of a base 1, a pressure plate 2, a support plate 3, a roughing frame 4 and a finishing frame 5. There are screw holes on the base 1, and this mechanism can be installed on the outlet of the extruder. The support plate 3 is adjusted left and right by the left and right adjusting bolts 31, the roughing frame 4 is adjusted up and down by the roughing up and down adjusting bolts 43, and the finishing frame 5 is adjusted up and down by the finishing up and down adjusting bolts 53. The left and right position of the support plate 3, the upper and lower position values ​​of the roughing device, and the upper and lower position of the finishing device can be adjusted respectively to ensure that the position of the profile shaping is on the same center line as the die discharge position of the extruder. The roughing frame 4 and the finishing frame 5 are both composed of two upper and lower rollers. The shapes of the roughing upper roller 41 and the finishing upper roller 51 are consistent with the inner cavity shape of the profile. The shapes of the roughing lower roller 42 and the finishing lower roller 52 are consistent with the outer surface shape of the profile. During shaping, the extruded profile is passed through the roughing upper roller 41 and the finishing upper roller 51 and the roughing lower roller 42 and the finishing lower roller 52. Under the clamping of the rollers, the profile is deformed to obtain the required shape to achieve the purpose of shaping. When the profile size accuracy requirement is low, only one set of rollers can be used for shaping. When the profile size accuracy requirement is high, two sets of rollers can be used for shaping. When the profile has a certain twist and cannot meet the design requirements, the roughing angle adjustment bolt 44 on the roughing frame 4 can be adjusted to rotate the roughing frame 4 by a certain angle to form a gap between the roughing frame 4 and the finishing frame 5. At a certain angle, when the profile passes through the two sets of rollers, torsional deformation occurs, thereby adjusting the twisting deformation of the profile to meet the daily rich needs of aluminum alloy thin-walled profile shaping. In daily use, the staff can start the driving motor 14 at one end of the transmission frame 13 to drive the transmission belt 15 and the first reciprocating screw rods 16 at both ends to rotate synchronously. At this time, one end of the first reciprocating screw rod 16 also rotates synchronously through the second reciprocating screw rods 18 at both ends of the central rotating shaft 17, and then the first reciprocating screw rod 16 and the second reciprocating screw rod 18 are rotated to cooperate with the limiting sliders 19 and the sliding sleeves 20 at the two ends of the bottom of the first protective cover 7 and the second protective cover 8 to adjust the first protective cover 7 and the second protective cover 8 as a whole. The first protective cover 7 and the second protective cover 8 can respectively perform adaptive cover connection and protection operations on the roughing frame 4 and the finishing frame 5 on the front and back sides of the support plate 3, thereby effectively ensuring that the interior of the roughing frame 4 and the finishing frame 5 will not be affected by the surrounding environment when the aluminum alloy thin-walled profile is being shaped. Usually, after the first protective cover 7 and the second protective cover 8 are connected, the first dust suction net groove 21 between the two and the second dust suction net groove 22 in the center of the inner wall can be used to perform synchronous chip suction operations, and then the first protective cover 7 and the second protective cover 8 cooperate with the feed racks 9 and the feed trough 10 on the front and back sides to perform rapid feeding and unloading of aluminum alloy thin-walled profiles. The above is the entire working principle of the present invention.

[0032] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A thin-walled aluminum alloy profile shaping device, comprising a base (1), characterized in that: A pressing plate (2) is fixedly connected to the surface of the base (1), a support plate (3) is fixedly connected to the center of the surface of the pressing plate (2), a roughing frame (4) is arranged on the front of the support plate (3), and a finishing frame (5) is arranged on the back of the base (1); An overhead seat (6), the bottom end of the base (1) is fixedly connected to the overhead seat (6), one side of the surface of the overhead seat (6) is movably connected to a first protective cover (7), and the other side of the surface of the overhead seat (6) is movably connected to a second protective cover (8), a material conveying frame (9) is fixedly connected to the side away from each other of the first protective cover (7) and the second protective cover (8), and a material conveying trough (10) is provided inside the material conveying frame (9), the center of both sides of the overhead seat (6) is fixedly connected to a fixed bracket (11), and both sides of the fixed bracket (11) are fixedly connected to a limiting slide (12), one end of the fixed bracket (11) and the limiting slide (12) is fixedly connected to a transmission frame (13), and one end of the transmission frame (13) is provided with a driving motor (14).

2. The aluminum alloy thin-walled profile shaping device according to claim 1, characterized in that: A transmission belt (15) is provided at one end of the driving motor (14), and both ends of the transmission belt (15) are fixedly connected to a first reciprocating screw rod (16), one end of the first reciprocating screw rod (16) is fixedly connected to a central rotating shaft (17), and one end of the central rotating shaft (17) is provided with a second reciprocating screw rod (18), and the first reciprocating screw rod (16) and the second reciprocating screw rod (18) have opposite directions.

3. The aluminum alloy thin-walled profile shaping device according to claim 1, characterized in that: The first protective cover (7) and the second protective cover (8) are fixedly connected to limit sliders (19) at both ends of their bottoms, and a sliding sleeve (20) is provided at the bottom end of the limit slider (19).

4. The aluminum alloy thin-walled profile shaping device according to claim 1, characterized in that: A first dust collection net groove (21) is provided on a side of the first protective cover (7) and the second protective cover (8) that are close to each other, and a second dust collection net groove (22) is provided on the inner wall of the first protective cover (7) and the second protective cover (8).

5. The aluminum alloy thin-walled profile shaping device according to claim 1, characterized in that: Left and right adjustment bolts (31) are arranged inside the support plate (3).

6. The aluminum alloy thin-walled profile shaping device according to claim 1, characterized in that: The roughing frame (4) is provided with an upper roughing roller (41) at the top end thereof, the roughing frame (4) is provided with a lower roughing roller (42) at the bottom end thereof, a roughing upper and lower adjustment bolt (43) is provided at one side of the top end of the support plate (3), and a roughing angle adjustment bolt (44) is provided at the top end of the roughing frame (4).

7. The aluminum alloy thin-walled profile shaping device according to claim 1, characterized in that: An upper finishing roller (51) is arranged at the inner top end of the finishing frame (5), a lower finishing roller (52) is arranged at the inner bottom end of the finishing frame (5), and upper and lower finishing adjustment bolts (53) are arranged at the upper top end of the finishing frame (5).

8. The aluminum alloy thin-walled profile shaping device according to claim 1, characterized in that: The roughing frame (4) and the finishing frame (5) are respectively matched with the support plate (3).

9. The aluminum alloy thin-walled profile shaping device according to claim 1, characterized in that: The base (1) is adapted to fit between the first protective cover (7) and the second protective cover (8).

Citation Information

Patent Citations

  • Aluminum alloy profile twisting and shaping device

    CN118002647B