Automatic stretching forming machine and method for decorative aluminum profile

Abstract

The invention relates to the technical field of metal drawing forming, in particular to a decorative aluminum profile automatic drawing forming machine and method.The decorative aluminum profile automatic drawing forming machine comprises an aluminum profile and a supporting cylinder, a plurality of installation faces are constructed on the aluminum profile, a plurality of through cavities are constructed in the aluminum profile, and partition plates are symmetrically arranged in the supporting cylinder; a stretching cavity is formed between the two partition plates in the supporting cylinder, a plurality of driving shafts distributed in the circumferential direction are arranged between the two partition plates in a penetrating mode, and a stretcher used for stretching the aluminum bar is arranged in the supporting cylinder; stretching of the connecting ring and extruding of the core punching rod are conducted synchronously, synchronous forming of the appearance and an inner cavity of an aluminum profile is achieved, in the process, the core punching rod has the heating function, the aluminum bar can be locally heated through the heating function of the core punching rod, the plasticity of the aluminum bar is improved, the deformation resistance is reduced, the aluminum bar is prone to plastic deformation, and the service life of the aluminum bar is prolonged. Therefore, plasticity is improved, deformation resistance is reduced, forming precision is improved, and extrusion force is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of metal drawing and forming, and in particular to an automatic drawing and forming machine and method for decorative aluminum profiles. Background Art

[0002] The material of decorative aluminum profiles is mainly aluminum alloy, which has excellent performance. First of all, the density of aluminum alloy is about one-third of that of steel, but its strength can reach or exceed that of some steels. This allows decorative aluminum profiles 1 to effectively reduce weight while meeting the structural strength requirements. In addition, aluminum alloy has good ductility and plasticity, and can be processed into profiles of various complex shapes through extrusion, stretching, bending and other processes to meet different design requirements.

[0003] The stretching process of aluminum profiles is a processing method that applies external force to cause plastic deformation of aluminum alloy materials, thereby changing their shape and size. It has the advantages of high efficiency, high precision, and high material utilization. The shapes of decorative aluminum profiles are complex and diverse, and the stretching and bending processes can further change the shape and size of the profiles. This excellent machinability enables decorative aluminum profiles to meet various complex design requirements.

[0004] The light weight, high strength, excellent ductility and plasticity, as well as good corrosion resistance and surface treatment properties of decorative aluminum profiles make them an ideal choice among modern decorative materials, while the stretching and bending processes give aluminum profiles more abundant shapes and size changes, enabling them to meet various complex design requirements, such as the metal pipe stretching machine with publication number CN100478092C, which relates to a metal pipe stretching device. The prior art includes: a frame, a track is arranged on the frame, a traction trolley is arranged on the track, a transmission chain is arranged below the traction trolley in the middle of the track, a stretching outer mold is arranged on the frame on one side of the track, the other side of the stretching outer mold is connected to one end of a lining rod, the other end of the lining rod is fixed on the frame, the metal pipe is sleeved on the lining rod, and the metal pipe sleeved on the lining rod is clamped by the traction trolley to pull it out of the stretching outer mold, and only single-stage stretching can be achieved.

[0005] However, the above-mentioned prior art still has some defects when stretching aluminum profiles: 1. The above-mentioned prior art pulls the traction trolley backward through the transmission chain, and the clamp clamps the chuck of the metal pipe to pull the metal pipe out of the die hole. The metal pipe undergoes plastic deformation under the pressure of the stretching outer die and the resistance of the die hole to achieve stretching forming. Since the height part of the metal pipe is always at the entrance of the die hole of the stretching outer die during the stretching process, the stretching force it is subjected to is relatively concentrated and continuous, while the stretching force of other parts gradually increases as the metal pipe gradually enters the die hole. Therefore, the stretching force on the height part is significantly greater than that on other parts, resulting in uneven distribution of the stretching force. The uneven stretching force will make it difficult to ensure the dimensional accuracy and shape accuracy of the metal pipe.

[0006] 2. In the above-mentioned prior art, during the stretching process, the height portion of the metal pipe is always at the entrance of the die hole of the stretching outer die and is subjected to continuous tensile force. Since the clamp continuously clamps and pulls the chuck of the metal pipe, the height portion is inevitably subjected to continuous tensile force in one direction. Uneven tensile force will lead to uneven mechanical properties of the metal material. The concentrated tensile force on the height portion will easily lead to stress concentration in this area. Stress concentration will accelerate fatigue and deformation of the metal material and may even cause cracks or fractures in the metal pipe in this area.

[0007] Based on this, and in accordance with the above-mentioned viewpoints, the existing technology for stretching and forming aluminum profiles still has room for improvement. Summary of the invention

[0008] In order to solve the above technical problems, the present application provides a decorative aluminum profile automatic stretching forming machine and method, which adopts the following technical solutions: In a first aspect, an automatic stretching forming machine for decorative aluminum profiles comprises an aluminum profile and a support tube, wherein the aluminum profile is provided with a plurality of mounting surfaces, and the aluminum profile is provided with a plurality of through cavities inside, wherein partition plates are symmetrically arranged inside the support tube, and a stretching cavity is formed between two partition plates inside the support tube, and a plurality of circumferentially distributed driving shafts are provided between the two partition plates, and a stretcher for stretching an aluminum rod is provided inside the support tube; The stretcher comprises a plurality of connecting rings which are threadedly connected to a plurality of driving shafts. The connecting rings are located in the stretching cavity, and a plane corresponding to the mounting surface is arranged on the outer side of the connecting ring.

[0009] Preferably, the stretcher further comprises a clamping rod slidably arranged on the plane, and a clamping plate is arranged between opposite sides of the clamping rod on the same connecting ring.

[0010] Preferably, a driving gear threadedly connected to the clamping rod is rotatably arranged on the plane, and driving gears at the same position on several connecting rings form a row. Driving racks corresponding to several rows of driving gears are circumferentially arranged between the two partition plates, and the driving racks are meshed with the driving gears, and the driving gears are meshed with a row of driving gears.

[0011] Preferably, a groove is provided on one side of the abutting plate, and a protrusion corresponding to the groove is provided on the other side of the abutting plate.

[0012] Preferably, a plurality of heating belts evenly distributed circumferentially are provided in the connecting ring.

[0013] Preferably, a core punch is provided in the support tube; The core punch comprises a plurality of sliding plates symmetrically arranged between the driving shafts and threadedly connected thereto, wherein the sliding plates are located on the back side of the two partition plates.

[0014] Preferably, punch rods are provided on opposite sides of the two sliding plates, the punch rods correspond to the cavities, a connecting hole corresponding to the punch rods is opened on the partition plate, and the punch rods slide through the connecting hole.

[0015] Preferably, the partition plate is slidably connected to the support tube, and adjusting screws are rotatably provided on opposite sides of the two partition plates, and one end of the adjusting screw passes through the support tube and is threadedly connected thereto.

[0016] In a second aspect, a decorative aluminum profile automatic stretching forming method, the use method of which comprises the following steps: S1: When stretching the aluminum bar, first put the aluminum bar between several connecting rings, make the clamping plate contact the aluminum bar, and then start the heating belt to preheat the aluminum bar; S2: The driving shaft drives the connecting ring to move through the threaded connection with the connecting ring, and the connecting rings are divided into two groups from the middle, and the two groups of connecting rings move to opposite sides at the same time; S3: The moving connecting ring moves the pressing plate together, and the pressing plate presses against the aluminum rod, so that the aluminum rod is stretched evenly. The synchronous movement of the connecting ring applies axial tensile force to the aluminum rod, and the aluminum rod undergoes plastic deformation under high temperature. S4: The clamping rods on the connecting rings drive the clamping plates to approach each other, and the clamping plates press the aluminum bars from multiple directions, so that the clamping plates press the aluminum profiles in multiple directions and evenly stretch them to form aluminum profiles with specific cross-sectional shapes and sizes.

[0017] In summary, the present application includes at least one of the following beneficial technical effects: 1. The stretching of the connecting ring and the extrusion of the core rod of the present invention are carried out simultaneously to realize the synchronous forming of the outer shape and the internal cavity of the aluminum profile. In this process, the core rod has a heating function. The heating function of the core rod can locally heat the aluminum rod, improve the plasticity of the aluminum rod, reduce the deformation resistance, and make the aluminum rod more susceptible to plastic deformation, thereby improving the plasticity, reducing the deformation resistance, improving the forming accuracy, and reducing the extrusion force.

[0018] 2. Before the aluminum rod is stretched and formed, the present invention injects heat-conducting liquid into the stretching cavity, and uses a heating belt and a core rod to heat the heat-conducting liquid, so as to achieve uniform heating of the aluminum rod. A plurality of connecting rings are divided into two groups from the middle, and the two groups of connecting rings move simultaneously to opposite sides. The clamping plate will clamp the aluminum rod so that the aluminum rod is stretched evenly, avoiding uneven deformation caused by concentrated stretching force. The moving direction and speed of the connecting ring are controlled by the rotation direction and speed of the driving shaft. The synchronous movement of the connecting ring applies axial tensile force to the aluminum rod, and the aluminum rod undergoes plastic deformation under high temperature.

[0019] 3. The clamping plate of the present invention will press the aluminum rod from multiple sides as the connecting ring moves. The synchronous movement of the connecting ring and the multi-directional pressing of the clamping plate ensure that the aluminum rod is subjected to uniform tensile force during the stretching process, thereby avoiding uneven deformation caused by concentrated tensile force.

[0020] At the same time, the clamping plates press the aluminum rod from multiple directions, firmly fixing the aluminum rod between the connecting rings, preventing the aluminum rod from bending, twisting or sliding during the stretching process. The clamping plates in the same row will press against the mounting surface of the aluminum profile, and apply axial tensile force to the aluminum profile through the movement of the connecting ring. At the same time, the clamping plates press the aluminum profile in multiple directions to achieve uniform stretching to form an aluminum profile with a specific cross-sectional shape and size. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the aluminum profile of the present invention.

[0022] Figure 2 It is a structural schematic diagram of the present invention.

[0023] Figure 3 It is a cross-sectional view of the present invention.

[0024] Figure 4 It is a structural schematic diagram of the stretcher of the present invention.

[0025] Figure 5 It is a schematic diagram of the structure among the connecting ring, the abutting rod and the abutting plate of the present invention.

[0026] Figure 6 It is a cross-sectional view of the core punch of the present invention.

[0027] Figure 7It is a structural schematic diagram of the partition plate of the present invention.

[0028] Figure 8 It is a schematic diagram of the structure between the partition plate and the punch rod of the present invention.

[0029] Explanation of the reference numerals: 1. Aluminum profile; 11. Mounting surface; 12. Cavity; 2. Support cylinder; 21. Partition plate; 22. Stretching cavity; 3. Drive shaft; 4. Stretcher; 41. Connecting ring; 42. Plane; 43. Clamping rod; 44. Clamping plate; 45. Drive gear; 46. Drive rack; 47. Groove; 48. Bump; 49. Heating belt; 5. Punch; 51. Sliding plate; 52. Punch rod; 53. Connecting hole; 54. Adjusting screw. DETAILED DESCRIPTION

[0030] The following is combined with Figures 1 to 8 This application is described in further detail.

[0031] The embodiment of the present application discloses an automatic stretching forming machine and method for decorative aluminum profiles, which transfers heat to an aluminum rod by heat conduction and convection, gradually raising the temperature of the aluminum rod, and then stretches the aluminum rod in the opposite direction to ensure that the aluminum rod is heated evenly, thereby avoiding uneven performance caused by uneven heating.

[0032] Embodiment 1: Reference Figure 1 As shown, the general decorative aluminum profile is referred to as an aluminum profile here. A plurality of mounting surfaces 11 are constructed on the aluminum profile, and a plurality of through cavities 12 are constructed inside the aluminum profile 1. Multiple mounting surfaces 11 are usually designed in profiles such as building doors and windows, curtain walls, etc., to facilitate connection with walls, glass and other components. The through cavities 12 can be used to install insulation strips, sealing strips, etc., to improve the thermal insulation performance of doors and windows, and also give the aluminum profile 1 a high degree of flexibility, load-bearing capacity and functionality.

[0033] When the aluminum profile 1 is stretched and formed, aluminum rods are generally used as raw materials. The aluminum rods are cut into appropriate lengths according to the length of the aluminum profile 1, and then axial tension is applied to the aluminum rods to cause plastic deformation and stretch them to the required length and cross-sectional size to form the aluminum profile 1. The stretched aluminum profile 1 also needs to undergo subsequent processing, such as straightening: correcting the bending and twisting of the aluminum profile 1, cutting: cutting the aluminum profile 1 to the final length, and surface treatment: performing surface treatments such as anodizing, electrophoretic coating, and powder spraying to improve the corrosion resistance and decorative properties of the aluminum profile 1.

[0034] Reference Figure 1 and Figure 2 As shown, an automatic stretching forming machine for decorative aluminum profiles includes a support tube 2, in which partition plates 21 are symmetrically arranged, and a stretching cavity 22 is formed between the two partition plates 21 in the support tube 2.

[0035] When stretching the aluminum rod, the aluminum rod is first placed on the stretcher 4 set in the support tube 2, and then a plurality of drive shafts 3 passing through the two partition plates 21 are driven to rotate, and the plurality of drive shafts 3 are distributed circumferentially. The rotating drive shafts 3 will drive the stretcher 4 to stretch the aluminum rod, and the stretcher 4 will stretch the aluminum rod evenly to both sides to cause plastic deformation of the aluminum rod until the aluminum rod is stretched to the required length and cross-sectional size to form an aluminum profile 1.

[0036] Reference Figure 3 , Figure 4 and Figure 5 As shown, specifically, the stretcher 4 includes a plurality of connecting rings 41 commonly arranged between the driving shafts 3, the connecting rings 41 are located in the stretching cavity 22, a plane 42 corresponding to the mounting surface 11 is arranged on the outer side of the connecting ring 41, a clamping rod 43 is slidably penetrated on the plane 42, and a clamping plate 44 is arranged between the opposite sides of the clamping rod 43 on the same connecting ring 41.

[0037] When stretching the aluminum rod, first put the aluminum rod between several connecting rings 41 so that the clamping plate 44 contacts the aluminum rod. The clamping plate 44 will press against the aluminum rod to fix it between the multiple connecting rings 41. At this time, the multiple heating belts 49 arranged in the connecting rings 41 are started, and the heat generated by the heating belts 49 is transferred to the aluminum rod by heat conduction and convection, so that the temperature of the aluminum rod gradually increases; and the heating belts 49 are evenly distributed circumferentially on the connecting rings 41 to ensure that the aluminum rod is heated evenly and avoid uneven performance caused by uneven heating.

[0038] After the heating belt 49 preheats the aluminum rod, the existing motor driving technology is used to drive the driving shaft 3 to rotate. The rotating driving shaft 3 drives the connecting ring 41 to move through the threaded connection with the connecting ring 41. Several connecting rings 41 are divided into two groups from the middle, and the two groups of connecting rings 41 move simultaneously to opposite sides.

[0039] The distance between several connecting rings 41 gradually increases, and the moving connecting ring 41 will drive the clamping plate 44 through the clamping rod 43 passing through the plane 42, so that the clamping plate 44 moves together with the connecting ring 41, and the clamping plate 44 will clamp the aluminum rod. Since the connecting ring 41 moves in the opposite direction, the aluminum rod is evenly stretched, avoiding uneven deformation caused by concentrated tensile force. The moving direction and speed of the connecting ring 41 are controlled by the rotation direction and speed of the driving shaft 3. The synchronous movement of the connecting ring 41 applies axial tensile force to the aluminum rod, and the aluminum rod undergoes plastic deformation under high temperature.

[0040] When the driving shaft 3 rotates to drive the connecting ring 41 to move, and the distance between the several connecting rings 41 gradually increases, the moving connecting ring 41 will drive the driving gear 45 set on the plane 42 to rotate, and the driving gears 45 at the same position on the several connecting rings 41 form a row of gears, and a driving rack 46 corresponding to the several rows of driving gears 45 is circumferentially arranged between the two partition plates 21, and one driving gear 45 is meshed with a row of driving gears 45.

[0041] When the connecting ring 41 drives the driving gear 45 to move, the driving gear 45 will rotate by meshing with the driving rack 46. The rotating driving gear 45 will drive the clamping rod 43 to move through the threaded connection with the clamping rod 43, and the clamping rod 43 on the connecting ring 41 will drive the clamping plates 44 to approach each other.

[0042] The clamping plate 44 will press the aluminum rod from multiple sides as the connecting ring 41 moves. The synchronous movement of the connecting ring 41 and the multi-directional pressing of the clamping plate 44 ensure that the aluminum rod is subjected to uniform tensile force during the stretching process, avoiding uneven deformation caused by concentrated tensile force. At the same time, the clamping plate 44 presses the aluminum rod from multiple directions, firmly fixing the aluminum rod between the connecting rings 41, avoiding bending, twisting or sliding of the aluminum rod during the stretching process.

[0043] Reference Figure 5 As shown, a groove 47 is provided on one side of the clamping plate 44, and a protrusion 48 corresponding to the groove 47 is provided on the other side of the clamping plate 44, until the protrusion 48 on the clamping plate 44 is inserted into the groove 47, the clamping plate 44 on the same connecting ring 41 is clamped by the protrusion 48 and the groove 47 to form a rectangle of the same size as the multiple mounting surfaces 11 of the aluminum profile 1, and the clamping plates 44 in the same column will be pressed against the mounting surface 11 of one of the aluminum profiles 1, and the movement of the connecting ring 41 applies axial tensile force to the aluminum profile 1, and at the same time, the clamping plate 44 performs multi-directional compression on the aluminum profile 1, so as to achieve uniform stretching to form an aluminum profile 1 with a specific cross-sectional shape and size.

[0044] Reference Figure 6 As shown, a pulley is provided at one end of several driving shafts 3, and the pulleys are connected by belts. By driving one of the driving shafts 3 to rotate, the rotating driving shaft 3 will drive the pulley connected to it to rotate together, and the rotating pulley will drive the remaining pulleys to rotate through the belt, and several pulleys rotate together, thereby causing several driving shafts 3 to rotate together.

[0045] Embodiment 2: Reference Figure 6 , Figure 7 and Figure 8As shown, on the basis of the first embodiment, an axial tensile force is applied to the aluminum profile 1 by moving the connecting ring 41, and at the same time, the clamping plate 44 performs multi-directional compression on the aluminum profile 1, so that the aluminum rod can be stretched out of the shape of the aluminum profile 1, but it is impossible to construct several through cavities 12 in the internal structure of the aluminum profile 1, so a punch 5 is provided in the support tube 2, and the punch 5 will form a cavity 12 inside the aluminum profile 1 by extrusion.

[0046] Specifically, the punch 5 includes a plurality of sliding plates 51 symmetrically arranged between the driving shafts 3 , and the sliding plates 51 are located at opposite sides of the two partition plates 21 .

[0047] When the driving shaft 3 rotates to drive the connecting ring 41 to move, the rotating driving shaft 3 will drive the sliding plates 51 on both sides to move relative to each other through the threaded connection with the sliding plate 51, and the sliding plate 51 will drive the punch rods 52 set on the opposite sides of the two sliding plates 51. A connecting hole 53 corresponding to the punch rod 52 is opened on the partition plate 21. After the punch rod 52 slides through the connecting hole 53, it will abut against the aluminum rod. The punch rod 52 corresponds to the cavity 12. At this time, the movement of the connecting ring 41 applies axial tensile force to the aluminum profile 1. At the same time, the punch rods 52 on both sides will squeeze the aluminum rod to form a cavity 12 inside the aluminum rod. The stretching and punching processes are carried out simultaneously to ensure that the outer shape of the aluminum profile 1 and the internal cavity 12 are formed at the same time.

[0048] The stretching of the connecting ring 41 and the extrusion of the core rod 52 are carried out simultaneously to realize the synchronous forming of the outer shape of the aluminum profile 1 and the internal cavity 12. In this process, the core rod 52 has a heating function. The heating function of the core rod 52 can locally heat the aluminum rod, improve the plasticity of the aluminum rod, reduce the deformation resistance, and make the aluminum rod more susceptible to plastic deformation, thereby improving the plasticity, reducing the deformation resistance, improving the forming accuracy, and reducing the extrusion force.

[0049] Until the opposite ends of the punch rods 52 on both sides are in cyclic contact, the inner cavity 12 of the aluminum profile 1 is completely formed.

[0050] The partition plate 21 is slidably connected to the support tube 2 , and an adjusting screw 54 is rotatably provided on opposite sides of the two partition plates 21 , and one end of the adjusting screw 54 passes through the support tube 2 and is threadedly connected thereto.

[0051] When the connecting ring 41 moves to both sides to stretch the aluminum rod, the connecting ring 41 stops moving when it contacts the partition plate 21, thereby completing the stretching of the aluminum profile 1. By rotating the adjusting screw 54, the rotating adjusting screw 54 will drive the partition plate 21 to move through the threaded connection with the support tube 2 to change the position of the partition plates 21 on both sides, that is, change the size of the stretching cavity 22, thereby changing the length of the stretched profile.

[0052] That is, when the partition plate 21 moves inward (close to the aluminum bar), the stretching cavity 22 becomes smaller and the stretching length of the aluminum profile 1 becomes shorter, and when the partition plate 21 moves outward (away from the aluminum bar), the stretching cavity 22 becomes larger and the stretching length of the aluminum profile 1 becomes longer. By adjusting the screw 54, the stretching processing of aluminum bars of different lengths and specifications can be adapted.

[0053] Embodiment three: References Figure 2 , Figure 3 and Figure 4 As shown, on the basis of Example 1 and Example 2, before the aluminum rod is stretched and formed, in order to improve the plasticity of the aluminum rod, reduce the deformation resistance, and achieve a more uniform heating effect, a heat-conducting liquid is injected into the stretching cavity 22, and the heat-conducting liquid is heated by using a heating belt 49 and a core rod 52, and then the heat is evenly transferred to the aluminum rod through the heat-conducting liquid, thereby achieving uniform heating of the aluminum rod.

[0054] Specifically, before the aluminum rod is placed in the stretching cavity 22, an appropriate amount of heat-conducting liquid is first injected into the stretching cavity 22. The heat-conducting liquid should be a liquid with good thermal conductivity, chemical stability and compatibility with aluminum, such as thermal oil, liquid metal, etc. The punch rod 52 extrude the aluminum rod during the stretching process, and a heating element can be integrated inside it, such as a resistance heating wire or a ceramic heating core. The heating element of the punch rod 52 generates heat when energized, and transfers the heat to the aluminum rod through the heat-conducting liquid.

[0055] The heating function of the punch rod 52 can further increase the temperature of the heat transfer fluid and compensate for the problem of uneven heating of the heating belt 49. The heat transfer fluid transfers the absorbed heat to the aluminum rod evenly through heat convection and heat conduction. The heat transfer fluid is wrapped around the aluminum rod, which can effectively avoid the problem of excessive surface temperature or local overheating of the aluminum rod.

[0056] The thermal fluid transfers heat evenly to the aluminum rod, and the temperature of the aluminum rod gradually rises to reach the temperature range required for stretching. After the temperature of the aluminum rod reaches the predetermined value, stretching forming begins. The thermal fluid heating process achieves uniform heating of the aluminum rod through the fluidity and thermal conductivity of the thermal fluid, improves heating efficiency and heating quality, reduces energy consumption, and protects the surface of the aluminum rod.

[0057] Finally, the present invention also provides a decorative aluminum profile automatic stretching forming method, and the use method thereof comprises the following steps: S1: Before the aluminum rod is stretched, in order to improve the plasticity of the aluminum rod, reduce the deformation resistance, and achieve a more uniform heating effect, a heat-conducting liquid is injected into the stretching cavity 22, and the heat-conducting liquid is heated by the heating belt 49 and the punch rod 52. The heat is then evenly transferred to the aluminum rod through the heat-conducting liquid, thereby achieving uniform heating of the aluminum rod.

[0058] S2: When the aluminum rod is stretched, the aluminum rod is first placed between the plurality of connecting rings 41 so that the pressing plate 44 contacts the aluminum rod. The pressing plate 44 presses against the aluminum rod to fix it between the plurality of connecting rings 41 .

[0059] S3: At this time, the multiple heating belts 49 set in the connecting ring 41 are started, and the heat generated by the heating belts 49 is transferred to the aluminum rod through the heat transfer fluid and convection, so that the temperature of the aluminum rod gradually increases; and the heating belts 49 are evenly distributed circumferentially on the connecting ring 41 to ensure that the aluminum rod is heated evenly and avoid uneven performance caused by uneven heating.

[0060] S4: After the heating belt 49 preheats the aluminum rod, the driving shaft 3 is driven to rotate through the existing motor driving technology. The rotating driving shaft 3 drives the connecting ring 41 to move through the threaded connection with the connecting ring 41. The connecting rings 41 are divided into two groups from the middle, and the two groups of connecting rings 41 move to opposite sides at the same time.

[0061] S5: The moving connecting ring 41 will drive the clamping plate 44 through the clamping rod 43 passing through the plane 42, so that the clamping plate 44 moves together with the connecting ring 41, and the clamping plate 44 will clamp the aluminum rod. Since the connecting ring 41 moves in the opposite direction, the aluminum rod is evenly stretched, avoiding uneven deformation caused by concentrated tensile force. The moving direction and speed of the connecting ring 41 are controlled by the rotation direction and speed of the driving shaft 3. The synchronous movement of the connecting ring 41 applies axial tensile force to the aluminum rod, and the aluminum rod undergoes plastic deformation under high temperature.

[0062] S6: When the connecting ring 41 drives the driving gear 45 to move, the driving gear 45 will rotate by meshing with the driving rack 46. The rotating driving gear 45 drives the clamping rod 43 to move through the threaded connection with the clamping rod 43. The clamping rod 43 on the connecting ring 41 drives the clamping plates 44 to approach each other.

[0063] S7: The clamping plate 44 presses the aluminum rod from multiple sides as the connecting ring 41 moves. The synchronous movement of the connecting ring 41 and the multi-directional pressing of the clamping plate 44 ensure that the aluminum rod is subjected to uniform tensile force during the stretching process, avoiding uneven deformation caused by concentrated tensile force. At the same time, the clamping plate 44 presses the aluminum rod from multiple directions, firmly fixing the aluminum rod between the connecting rings 41, avoiding bending, twisting or sliding of the aluminum rod during the stretching process.

[0064] S8: Until the protrusion 48 on the clamping plate 44 is inserted into the groove 47, the clamping plate 44 on the same connecting ring 41 is clamped by the protrusion 48 and the groove 47 to form a rectangle of the same size as the multiple mounting surfaces 11 of the aluminum profile 1, and the clamping plates 44 in the same column are pressed against the mounting surface 11 of one of the aluminum profiles 1. The movement of the connecting ring 41 applies axial tensile force to the aluminum profile 1, and at the same time, the clamping plate 44 performs multi-directional compression on the aluminum profile 1 to achieve uniform stretching to form an aluminum profile 1 with a specific cross-sectional shape and size.

[0065] S9: When the driving shaft 3 rotates to drive the connecting ring 41 to move, the rotating driving shaft 3 drives the sliding plates 51 on both sides to move relative to each other through the threaded connection with the sliding plates 51, and the sliding plates 51 drive the punch rods 52 provided on the opposite sides of the two sliding plates 51 until the opposite ends of the punch rods 52 on both sides are in circular contact, and the internal cavity 12 of the aluminum profile 1 is completely formed.

[0066] S10: The stretching of the connecting ring 41 and the extrusion of the core rod 52 are carried out simultaneously to realize the synchronous forming of the outer shape of the aluminum profile 1 and the internal cavity 12. In this process, the core rod 52 has a heating function. The heating function of the core rod 52 can locally heat the aluminum rod, improve the plasticity of the aluminum rod, reduce the deformation resistance, and make the aluminum rod more susceptible to plastic deformation, thereby improving the plasticity, reducing the deformation resistance, improving the forming accuracy, and reducing the extrusion force.

[0067] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic stretching machine for decorative aluminum profiles, comprising an aluminum profile (1) and a support tube (2), wherein the aluminum profile (1) is provided with a plurality of mounting surfaces (11), and the aluminum profile (1) is provided with a plurality of through cavities (12), characterized in that: The support tube (2) is symmetrically provided with partition plates (21), a stretching cavity (22) is formed between two partition plates (21) in the support tube (2), a plurality of circumferentially distributed drive shafts (3) are passed through between the two partition plates (21), and a stretcher (4) for stretching the aluminum rod is provided in the support tube (2); The stretcher (4) comprises a plurality of connecting rings (41) that are threadedly connected to a plurality of drive shafts (3); the connecting rings (41) are located in the stretching cavity (22); and a plane (42) corresponding to the mounting surface (11) is provided on the outside of the connecting ring (41).

2. The automatic stretching machine for decorative aluminum profiles according to claim 1, characterized in that: The stretcher (4) further comprises a clamping rod (43) slidably disposed on the plane (42), and a clamping plate (44) is disposed between opposite sides of the clamping rod (43) on the same connecting ring (41).

3. The automatic stretching machine for decorative aluminum profiles according to claim 2, characterized in that: A driving gear (45) threadably connected to the abutting rod (43) is rotatably arranged on the plane (42); the driving gears (45) at the same position on the plurality of connecting rings (41) form a row; a driving rack (46) corresponding to the plurality of rows of driving gears (45) is circumferentially arranged between the two partition plates (21); the driving rack (46) meshes with the driving gear (45), and the driving gear (45) meshes with a row of driving gears (45).

4. The automatic stretching machine for decorative aluminum profiles according to claim 3, characterized in that: A groove (47) is provided on one side of the abutting plate (44), and a protrusion (48) corresponding to the groove (47) is provided on the other side of the abutting plate (44).

5. The automatic stretching machine for decorative aluminum profiles according to claim 1, characterized in that: A plurality of heating belts (49) evenly distributed in the circumferential direction are arranged in the connection ring (41).

6. The automatic stretching machine for decorative aluminum profiles according to claim 1, characterized in that: A core punch (5) is arranged in the support tube (2); The core punch (5) comprises a plurality of sliding plates (51) symmetrically arranged between the drive shafts (3) and threadedly connected thereto, wherein the sliding plates (51) are located on the back side of the two partition plates (21).

7. The automatic stretching machine for decorative aluminum profiles according to claim 6, characterized in that: A punch rod (52) is provided on opposite sides of the two sliding plates (51), the punch rod (52) corresponds to the cavity (12), a connecting hole (53) corresponding to the punch rod (52) is provided on the partition plate (21), and the punch rod (52) slides through the connecting hole (53).

8. The automatic stretching machine for decorative aluminum profiles according to claim 1, characterized in that: The partition plate (21) is slidably connected to the support tube (2), and an adjusting screw (54) is rotatably provided on opposite sides of the two partition plates (21), one end of the adjusting screw (54) passes through the support tube (2) and is threadedly connected thereto.

9. A decorative aluminum profile automatic stretching forming method, using a decorative aluminum profile automatic stretching forming machine as claimed in any one of claims 1 to 8, characterized in that: The method of use includes the following steps: S1: When the aluminum rod is stretched, the aluminum rod is first placed between a plurality of connecting rings (41) so that the abutting plate (44) abuts against the aluminum rod, and then the heating belt (49) is started to preheat the aluminum rod; S2: The driving shaft (3) drives the connecting ring (41) to move by being threadedly connected to the connecting ring (41), and the connecting rings (41) are divided into two groups from the middle, and the two groups of connecting rings (41) move to opposite sides at the same time; S3: The moving connecting ring (41) causes the pressing plate (44) to move together, and the pressing plate (44) presses against the aluminum rod, so that the aluminum rod is evenly stretched. The synchronous movement of the connecting ring (41) applies an axial tensile force to the aluminum rod, so that the aluminum rod undergoes plastic deformation under high temperature; S4: The pressing rod (43) on the connecting ring (41) drives the pressing plates (44) to move closer to each other, and the pressing plates (44) press the aluminum rod from multiple directions, so that the pressing plates (44) press the aluminum profile (1) in multiple directions, and evenly stretch the aluminum profile (1) to form a specific cross-sectional shape and size.

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