A method of processing and forming a complex profiled tube

Abstract

The application relates to a processing and forming method of a complex profile pipe, and belongs to the technical field of pipe forming processes, which solves the problems of poor forming consistency, complex process and inconvenience in replacing a mold in the pipe forming process in the prior art. The processing and forming method of the complex profile pipe specifically comprises the following steps: step 1, pretreating a pipe blank before rolling to make it in a state capable of being roll-formed; step 2, lifting an upper mold; step 3, placing the pipe blank before rolling into a gap between the upper mold and a lower mold, and lowering the upper mold; step 4, simultaneously driving a first driving shaft and a second driving shaft to make the upper mold and the lower mold rotate; and step 5, obtaining a pipe blank after rolling and taking it out of the complex profile pipe forming device. The application can continuously and uniformly press the pipe at a constant speed, realizes continuous and orderly deformation, and solves the problems of poor consistency and complex process of the existing forming method of the metal pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe forming process, in particular to a processing and forming method of complex profile pipe. BACKGROUND

[0002] Due to the increasingly urgent lightweighting demand of the aerospace industry, the requirements for large-scale, thin-walled and integrated components are becoming higher and higher. Under the condition that the structural stiffness and strength meet the requirements, the thickness of the components is continuously reduced, and the application of large-diameter thin-walled aluminum alloy long pipe fittings in aircraft and spacecraft is continuously expanding.

[0003] With the development of the aerospace industry, the target pipe shape is increasingly complex, and when the upper and lower molds are directly pressed as a whole by artificial means, defects such as local instability and wrinkling may occur. At present, the method of pressing multiple times by a press is used for processing, however, this method has low processing efficiency, poor consistency and uncontrollable profile precision, and how to ensure the high efficiency and high quality of large-diameter thin-walled pipes is a difficult problem in the manufacture of such products.

[0004] During the pressing process of large-diameter curved pipes, the overall mold will lose stability during the pressing process due to the large-diameter pipe, and the overall performance of the pipe is uneven, resulting in instability during the preforming process, which cannot achieve the required consistency of the pipe product. However, the current method of using an oil press to press one position at a time and then testing the mold not only has low processing efficiency, but also cannot guarantee consistency.

[0005] In addition, due to the complex and diverse profile of the curved pipe, different profiles of the pipe require different molds, so high-frequency mold replacement is required to meet the needs of pipes with different profiles, and the mold in the prior art is replaced as a whole, which is time-consuming and laborious. SUMMARY

[0006] In view of the above analysis, the present application aims to provide a processing and forming method of complex profile pipe to solve the problems of poor forming consistency, complex process and inconvenient mold replacement in the pipe forming process in the prior art.

[0007] The main purpose of the present application is achieved by the following technical solutions:

[0008] A processing and forming method of complex profile pipe, comprising the following steps:

[0009] Step 1: pretreat the pipe blank before rolling to make it in a state capable of being roll-formed;

[0010] Step 2: pull up the upper mold;

[0011] Step 3: place the pipe blank before rolling into the gap between the upper mold and the lower mold, and lower the upper mold;

[0012] Step 4: simultaneously drive the first driving shaft and the second driving shaft to rotate the upper mold and the lower mold;

[0013] Step 5: obtain the rolled pipe blank and take it out of the complex profile pipe forming device.

[0014] Further, in step 2, the driving cylinder is driven to move the bearing support upward.

[0015] Further, in step 2, the first driving shaft drives the first driving shaft to move upward synchronously.

[0016] Further, in step 2, the first driving shaft drives the first driving shaft to move upward synchronously.

[0017] Further, in step 2, the first driving shaft drives the first fixed part in the elastic assembly to move upward, so that the elastic part is stretched.

[0018] Further, in step 2, the first driving shaft drives the first driving shaft to move upward synchronously through the connecting rod.

[0019] Further, in step 3, the driving cylinder is driven to move the bearing support downward.

[0020] Further, in step 3, the first driving shaft is reset.

[0021] Further, the first driving shaft and the second driving shaft are driven to rotate reversely and at the same speed.

[0022] Further, the upper mold and the lower mold roll to roll form the pipe blank before rolling.

[0023] Compared with the prior art, the present application can at least achieve one of the following beneficial effects:

[0024] (1) The present application places the pipe to be formed between the upper and lower molds, and rolls and presses the curved pipe with a specific profile through the relative rolling between the upper and lower molds. This method can continuously and continuously press the pipe, thereby avoiding the risk of wrinkles and cracks caused by uneven multiple pressing of the pipe, achieving continuous and orderly deformation, and solving the problems of poor consistency and complex process of the existing forming method of such metal pipes (such as multiple mechanical processing), and realizing precise forming of complex pipe parts.

[0025] (2) The mold edge part of the upper mold and the lower mold of the present application is in contact with each other, so that the pipe blank before rolling is limited in the pressing part of the upper mold and the lower mold, thereby making the upper mold, the lower mold and the pipe blank before rolling in linear contact, that is, using the local loading principle, the recess structure is processed on the pipe blank in continuous steps, the contact area of the large cylinder and the mold is reduced, the flow ability perpendicular to the pipe pressing direction is improved, the pipe is more easily flowed horizontally, that is, a certain profile pipe is gradually prepared by using smaller load, the tonnage requirement of the equipment is lower, the cost is reduced and the energy consumption is saved.

[0026] (3) The upper mold and the lower mold of the present application can be locally or integrally disassembled, and the mold replacement is quickly realized. For the deformation of pipe with different specifications and different profiles, only one or more stress pressing blocks need to be replaced, thereby improving the production efficiency. In addition, for the damage of the mold in different areas, only the damaged stress pressing block needs to be replaced, thereby effectively reducing the mold production cost.

[0027] In the present application, the above technical solutions can be combined with each other to realize more preferred combination schemes. Other features and advantages of the present application will be described in the subsequent specification, and some advantages will become apparent from the specification, or will be understood by implementing the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings are included to provide a further understanding of the application and are incorporated herein and constitute a part of the detailed description. The drawings illustrate embodiments of the application and, together with the description, serve to explain the principles of the application. In the drawings:

[0029] The accompanying drawings are included to provide a further understanding of the application and are incorporated herein and constitute a part of the detailed description. The drawings illustrate embodiments of the application and, together with the description, serve to explain the principles of the application. In the drawings:

[0030] Figure 1 Structure schematic view of one embodiment of the complex profile pipe forming device of the present application;

[0031] Figure 2 Front view of one embodiment of the complex profile pipe forming device of the present application;

[0032] Figure 3 Side view of one embodiment of the complex profile pipe forming device of the present application;

[0033] Figure 4 Forming process diagram of one embodiment of the complex profile pipe forming device of the present application;

[0034] Figure 5 Detail enlarged view of B in the present application; Figure 1

[0035] Figure 6 ​Structure diagram of another embodiment of the complex profile pipe forming device of the present application;

[0036] Figure 7 Side view of the upper die and lower die of the complex profile pipe forming device of the present application;

[0037] Figure 8 Front view of the upper die and lower die of the complex profile pipe forming device of the present application;

[0038] Figure 9 Structure diagram of the complex profile pipe forming device of the present application Figure 7 A-A sectional view of the present application;

[0039] Figure 10 Structure diagram of the upper die / lower die of the complex profile pipe forming device of the present application;

[0040] Figure 11 Exploded view of the upper die / lower die of the complex profile pipe forming device of the present application;

[0041] Figure 12 Structure diagram of the force receiving pressing block of the complex profile pipe forming device of the present application;

[0042] Figure 13 Flow chart of the processing and forming method of the complex profile pipe of the present application.

[0043] Reference signs:

[0044] 1 - upper die; 101 - die pressing part; 102 - die edge part; 103 - protruding part; 104 - hub; 105 - support column; 1051 - limiting boss; 106 - force receiving pressing block; 1061 - guide column; 1062 - guide groove; 1063 - connecting part; 107 - fastener;

[0045] 2 - lower die; 3 - pipe blank before rolling; 4 - pipe blank after rolling; 5 - rack; 6 - bearing support seat; 7 - driving cylinder; 8 - first rolling shaft; 9 - second rolling shaft;

[0046] 10 - first driving shaft; 11 - second driving shaft; 111 - sliding groove; 112 - elastic assembly; 1121 - first fixing part; 1122 - second fixing part; 1123 - elastic part; 113 - connecting rod; 12 - first rack; 13 - second rack. DETAILED DESCRIPTION

[0047] The processing and forming method of a complex profile pipe will be further described in detail below in combination with specific embodiments, which are only used for comparison and explanation purposes, and the present application is not limited to these embodiments.

[0048] Embodiment 1

[0049] One specific embodiment of the present application discloses a method for processing and forming a complex profile pipe, as shown in the accompanying drawings, the specific steps include: Figure 13

[0050] Step 1: Pretreat the pipe blank 3 before rolling to make it in a state capable of being roll-formed.

[0051] Step 2: Pull up the upper die 1.

[0052] Step 21: As shown in the accompanying drawings, drive the driving cylinder 7 to make the bearing support 6 go up. Figures 1-4

[0053] Drive the driving cylinder 7, and under the driving of the driving cylinder 7, the bearing support 6 drives the upper die 1 to go up synchronously through the first rolling shaft 8, so that the upper die 1 moves away from the lower die 2 until the distance between the upper die 1 and the lower die 2 is greater than the diameter of the pipe blank 3 before rolling, so that the pipe blank 3 before rolling can be placed between the upper die 1 and the lower die 2.

[0054] Step 22: The first rolling shaft 8 drives the first driving shaft 10 to go up synchronously.

[0055] The first rolling shaft 8 drives the first driving shaft 10 to go up synchronously through the first rack 12 engaged with the first rolling shaft 8, so that the first driving shaft 10 slides up in the sliding groove 111.

[0056] Step 221: The elastic assembly 112 works.

[0057] One embodiment of the present application, as shown in the accompanying drawings, the first driving shaft 10 drives the first fixed part 1121 in the elastic assembly 112 to go up, so that the elastic part 1123 is stretched. Figure 5 The first driving shaft 10 can be limitedly slid along the sliding groove 111, and under the stretching of the elastic part 1123, the first fixed part 1121 on the first driving shaft 10 can always be in a downward stretching state to ensure the tension of the rack 11.

[0058] Step 222: The first rolling shaft 8 drives the first driving shaft 10 to go up synchronously through the connecting rod 13.

[0059] Another embodiment of the present application, as shown in the accompanying drawings, the first rolling shaft 8 and the first driving shaft 10 are connected through the connecting rod 113 to fix the distance between the first rolling shaft 8 and the first driving shaft 10, and at the same time limit the inclination angle of the connecting rod 113 through the sliding groove 111, so that the first rolling shaft 8 drives the first driving shaft 10 to go up synchronously without angle deflection.

[0060] Figure 6

[0061] ​​​​Step 3: Place the tube blank 3 before rolling into the gap between the upper mold 1 and the lower mold 2, and lower the upper mold 1.

[0062] Step 31: Drive the drive cylinder 7 to make the bearing support 6 move downward.

[0063] like Figures 7-9 As shown, the drive cylinder 7 drives the bearing support 6. Under the drive of the drive cylinder 7, the bearing support 6 drives the upper mold 1 to move down synchronously through the first rolling shaft 8, so that the upper mold 1 moves closer to the lower mold 2 until the mold edge 102 of the upper mold 1 and the lower mold 2 come into contact with each other. The tube blank 3 before rolling is restricted in the pressing part 101 of the upper mold 1 and the lower mold 2.

[0064] This allows for line contact between the upper die 1, lower die 2, and the tube blank 3 before rolling. This is achieved by using the principle of local loading to continuously process the recessed structure on the tube blank in steps. This reduces the contact area between the large cylinder and the die, improves the flow capacity perpendicular to the downward pressing direction of the tube, and makes the tube easier to flow laterally. In other words, a tube with a certain profile can be gradually produced using a smaller load. This requires less equipment tonnage, reduces costs, and saves energy.

[0065] Step 32: Reset the first drive shaft 10.

[0066] The first rolling shaft 8 moves downward, and the first drive shaft 10 moves downward synchronously, so that the first drive shaft 10 slides downward in the sliding groove 111.

[0067] Step 321: Reset the elastic component 112.

[0068] In one embodiment of the present invention, the first drive shaft 10 is stretched by the elastic element 1123 in the elastic component 112, causing the first drive shaft 10 to slide downward along the sliding groove 111 until the first rack 12 is in a tensioned state.

[0069] Step 322: The first rolling shaft 8 drives the first drive shaft 10 to move downward synchronously via the connecting rod 13.

[0070] In another embodiment of the present invention, the distance between the first rolling shaft 8 and the first drive shaft 10 is fixed by the connecting rod 113, and the tilt angle of the connecting rod 113 is limited by the sliding groove 111, so that when the first rolling shaft 8 moves downward, it drives the first drive shaft 10 to move downward synchronously without angular deflection.

[0071] Step 4: Simultaneously drive the first drive shaft 10 and the second drive shaft 11 to rotate the upper mold 1 and the lower mold 2.

[0072] Step 41: The first drive shaft 10 and the second drive shaft 11 move in opposite directions at the same speed.

[0073] Drive the first drive motor to make the first driving shaft 10 rotate, so that the first rack 12 drives the first rolling shaft 8 to rotate synchronously in the same direction, so that the upper die 1 on the first rolling shaft 8 rotates together.

[0074] At the same time, drive the second drive motor in the same direction to make the second driving shaft 11 rotate, so that the second rack 13 drives the second rolling shaft 9 to rotate synchronously in the same direction, so that the lower die 2 on the second rolling shaft 9 rotates together.

[0075] Step 42: The upper die 1 and the lower die 2 roll, and the pipe blank 3 before rolling is roll formed.

[0076] When the upper die 1 and the lower die 2 roll the pipe blank 3 before rolling, the protruding part 103 on the arc-shaped concave surface of the pressing part 101 forms a complex profile on the surface of the pipe blank 3 before rolling.

[0077] Among them, the protruding part 103 is provided with corresponding protrusions according to the demand of the target product, the shape and size of the protrusions are related to the depth of the target part, and the distance from the arc-shaped concave surface to the center of the rotating shaft is determined according to the pressing position and depth of the pipe blank, and appropriate compensation is given according to the springback caused by the elastic strain of the material.

[0078] Step 5: Obtain the rolled pipe blank 4 and take it out of the complex profile pipe forming device.

[0079] Stop the first drive motor and the second drive motor to stop the rotation of the upper die 1 and the lower die 2.

[0080] Drive the drive cylinder 7, and the bearing support 6 drives the upper die 1 up through the first rolling shaft 8, until the distance between the upper die 1 and the lower die 2 is greater than the diameter of the large rolled pipe blank 4, and the pressed pipe blank is taken out. Complete the processing and forming of the complex profile pipe.

[0081] Using the complex profile pipe part processing and forming method of the embodiment, the formed complex profile large diameter bending pipe can meet the needs of complex profile, thereby solving the problems of poor consistency and complex process of existing forming methods of such metal pipes, realizing precise forming of complex component large diameter pipes, meeting the demand of lightweight, and realizing accurate shape control of pipe pressing. The method improves the processing efficiency by 50% and the consistency by 100% compared with the existing traditional processing method.

[0082] Step 6: Replace the upper die 1 or / and the lower die 2, and repeat steps 1-5 for the next rolling forming operation.

[0083] In order to realize the local rapid replacement of the upper die 1 and the lower die 2, the upper die 1 and the lower die 2 can be partially or integrally disassembled, and the replacement of the die can be quickly realized. For different specifications and different profile requirements of pipe deformation, only one or more stress blocks need to be replaced, which improves the high-efficiency production mode. In addition, for different area die damage, only the damaged stress block needs to be replaced, thereby effectively reducing the die production cost.

[0084] Step 61: one or more stress blocks 106 of the upper die 1 are disassembled.

[0085] The fastener 107 is taken out from the connecting portion 1063 of the stress block 106 and the through hole of the support column 105, and the stress block 106 is disassembled. According to different specifications and different profile requirements of pipe deformation, one or more stress blocks 106 corresponding to the stress block 106 are replaced.

[0086] This method not only improves the production efficiency and work efficiency; in addition, for different area die damage, only the damaged stress block 106 needs to be replaced, thereby effectively reducing the die production cost and labor cost.

[0087] Step 62: one or more stress blocks 106 required are installed on the upper die 1.

[0088] Step 621: the guide column 1061 of the stress block 106 is in sliding connection with the guide groove 1062 of the adjacent stress block 106.

[0089] The stress block 106 is installed on the upper die, the guide column 1061 of the stress block 106 is embedded in the guide groove 1062 of the adjacent stress block 106, and the guide column 1061 is in sliding connection with the guide groove 1062.

[0090] This method plays a guiding role in the installation of the stress block 106 through the guide column 1061 and the guide groove 1062, avoiding the deviation of the stress block 106 during the installation process, which causes the change of the rolling profile.

[0091] Step 622: the stress block 106 is fixed on the support column 105.

[0092] The connecting portion 1063 of the stress block 106 is inserted into the connecting end of the support column 105, and the connecting portion 1063 is limited against the limiting boss 1051 of the support column 105, and the fastener 107 is simultaneously inserted into the connecting portion 1063 and the through hole of the support column 105, thereby fastening the connecting portion 1063 and the support column 105.

[0093] It is worth mentioning that, in order to ensure that the connecting part 1063 of each pressure block 106 is inserted into the connecting end of the support column 105 at a consistent distance, the limiting boss 1051 of the support column 105 is used for limiting, so that the relative position between the pressure block 106 and the support column 105 is consistent.

[0094] After installation, the adjacent two pressure blocks 106 can be clamped and limited through the clamping between the guide column 1061 and the guide groove 1062, so that the misplacement of the pressure block 106 during the rolling process is avoided.

[0095] Embodiment 2

[0096] As shown in the specific embodiment of the present application, Figures 1-3 a complex profile pipe forming device for embodiment 1 is disclosed, which comprises a rack 5, an upper die 1, a first rolling shaft 8, a lower die 2, a second rolling shaft 9 and a driving assembly arranged in the rack 5, the upper die 1 is sleeved on the first rolling shaft 8, the lower die 2 is sleeved on the second rolling shaft 9, the first rolling shaft 8 and the second rolling shaft 9 are rotationally connected to the rack 5, and the driving assembly can drive the first rolling shaft 8 and the second rolling shaft 9 to rotate in opposite directions at the same frequency, so as to drive the upper die 1 and the lower die 2 to move synchronously.

[0097] In implementation, as shown in the specific embodiment of the present application, Figure 4 the pipe blank 3 before rolling is inserted between the upper die 1 and the lower die 2, the upper die 1 and the lower die 2 move in opposite directions at the same frequency, and under the rolling of the upper and lower dies, the pipe blank 3 before rolling is rolled and obtained as the pipe blank 4 after rolling (i.e. the target product).

[0098] As shown in the specific embodiment of the present application, Figure 3 the vertical driving module comprises a bearing support 6 and a driving cylinder 7, the upper end of the driving cylinder 7 is fixedly connected to the inner wall of the rack 5, the lower end is connected to the bearing support 6, and the bearing support 6 is arranged on the first rolling shaft 8.

[0099] Further, the first rotation driving module comprises a first driving motor, a first main shaft 10 and a first rack 12, and the first rack 12 is engaged with the first main shaft 10 and the first rolling shaft 8. The second rotation driving module comprises a second driving motor, a second main shaft 11 and a second rack 13, and the second rack 13 is engaged with the second main shaft 11 and the second rolling shaft 9.

[0100] In order to ensure that the first rack 12 is always in a tension state, as shown in the specific embodiment of the present application, Figure 5 the device further comprises an elastic assembly 112 arranged below the sliding groove 111; the elastic assembly 112 comprises a first fixing piece 1121, a second fixing piece 1122 and an elastic piece 1123.

[0101] The first fixing part 1121 is fixedly connected to the first driving shaft 10, the second fixing part 1122 is fixedly connected to the frame 5, one end of the elastic part 1123 is connected with the first fixing part 1121, and the other end is connected with the second fixing part 1122, and the elastic part 1123 is always in a stretched state.

[0102] Another embodiment of the application, as shown in the figure, can also include a connecting rod 113. One end of the connecting rod 113 is rotatably connected with the first rolling shaft 8, and the other end is rotatably connected with the first driving shaft 10. Figure 6

[0103] The upper mold 1 and the lower mold 2 of the embodiment are the same in structure, as shown in the figure, both include a mold pressing part 101 and a mold edge part 102. The pressing part 101 is a cylindrical structure with an arc-shaped inner concave surface arranged in the circumferential direction, and the diameter of the cross section increases from the middle to the two ends at one time. The two edge parts 102 are arranged at the two ends of the pressing part 101. Figures 7-8

[0104] The pressing part 101 of the upper mold 1 is a cylindrical structure with an arc-shaped inner concave surface arranged in the circumferential direction, and the diameter of the cross section increases from the middle to the two ends at one time.

[0105] Further, as shown in the figure, the arc-shaped inner concave surface of the pressing part 101 is provided with a protruding part 103, and the protruding part 103 includes a plurality of protrusions. Figure 9 Another specific embodiment of the application, the upper mold 1 and the lower mold 2 are arranged to be capable of local disassembly and replacement. Specifically, as shown in the figure, the upper mold 1 and the lower mold 2 are the same in structure, both including a hub 104, a support column 105, a stress pressing block 106 and a fastener 107. The support column 105 is provided with a plurality of support columns 105, one end of the plurality of support columns 105 is evenly fixed to the outer side wall of the hub 104 in a divergent manner, and the other end is detachably connected with the stress pressing block 106 through the fastener 107.

[0106] Figures 10-11 The plurality of stress pressing blocks 106 can be spliced to form the upper mold in embodiment 1, that is, the stress pressing block 106 is a fan-shaped three-dimensional structure, the outer side is provided with an arc-shaped inner concave surface, the diameter of the cross section increases from the middle to the two ends at one time, and the arc-shaped inner concave surface of the stress pressing block 106 is also provided with a protruding part 103, and the protruding part 103 includes a plurality of protrusions.

[0107] As shown in the figure, the stress pressing block 106 includes a guide column 1061 and a guide groove 1062. The guide column 1061 is arranged on one side of the contact surface of the stress pressing block 106, and the guide groove 1062 is arranged on the other side of the contact surface of the stress pressing block 106.

[0108] As shown in the figure, the stress pressing block 106 includes a guide column 1061 and a guide groove 1062. The guide column 1061 is arranged on one side of the contact surface of the stress pressing block 106, and the guide groove 1062 is arranged on the other side of the contact surface of the stress pressing block 106. Figure 12

[0109] ​​​​Further, the pressure block 106 further comprises a connecting portion 1063, which is detachably connected with the support column 105.

[0110] It is worth mentioning that, in the installation process of the pressure block 106, in order to ensure that the connecting portion 1063 of each pressure block 106 is inserted into the connecting end of the support column 105 at a consistent distance, the support column 105 comprises a limiting boss 1051, so that the connecting portion 1063 can be limited by the limiting boss 1051 when being inserted into the support column 105, thereby ensuring that the relative position between the pressure block 106 and the support column 105 is consistent, and facilitating the work of the staff and improving the work efficiency.

[0111] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method of forming a complex profiled pipe, said pipe being a large diameter thin walled pipe; characterised in that, It comprises the following steps: Step 1: pretreat the pipe blank (3) before rolling to make it in a state that can be roll-formed; Step 2: pull up the upper die (1): the upper die (1) is sleeved on the first rolling shaft (8), and the lower die (2) is sleeved on the second rolling shaft (9); the first rolling shaft (8) drives the first driving shaft (10) to move upward synchronously through the first rack (12) engaged therewith, so that the first driving shaft (10) slides upward in the sliding groove (111); Step 3: place the pipe blank (3) before rolling into the gap between the upper die (1) and the lower die (2), and lower the upper die (1) so that the upper die (1) moves close to the lower die (2) until the die edge parts (102) of the upper die (1) and the lower die (2) contact each other, and the pipe blank (3) before rolling is limited in the pressing part (101) of the upper die (1) and the lower die (2); Step 4: drive the first driving motor to make the first driving shaft (10) rotate, so that the first rolling shaft (8) rotates synchronously in the same direction through the first rack (12), so that the upper die (1) on the first rolling shaft (8) rotates synchronously; at the same time, drive the second driving motor to make the second driving shaft (11) rotate, so that the second rolling shaft (9) rotates synchronously in the same direction through the second rack (13), so that the lower die (2) on the second rolling shaft (9) rotates synchronously; Under the rolling drive of the upper die (1) and the lower die (2), the pipe blank (3) before rolling moves forward and is rolled by the upper die (1) and the lower die (2); when the upper die (1) and the lower die (2) roll the pipe blank (3) before rolling, the surface of the pipe blank (3) before rolling is formed with a complex profile through the protruding part (103) on the arc-shaped concave surface of the pressing part (101); Step 5: obtain the pipe blank (4) after rolling and take it out of the complex profile pipe forming device.

2. The method of claim 1, wherein The bearing support (6) is arranged on the first rolling shaft (8); in step 2, the driving cylinder (7) is driven to make the bearing support (6) move upward.

3. The method of claim 2, wherein In step 2, the first rolling shaft (8) drives the first driving shaft (10) to move upward synchronously.

4. The method of claim 2, wherein It also comprises an elastic assembly (112) arranged below the sliding groove (111); the elastic assembly (112) comprises a first fixing part (1121), a second fixing part (1122) and an elastic part (1123); wherein the first fixing part (1121) is fixedly connected to the first driving shaft (10), the second fixing part (1122) is fixedly connected to the rack (5), one end of the elastic part (1123) is connected to the first fixing part (1121), the other end is connected to the second fixing part (1122), and the elastic part (1123) is always in a stretched state; in step 2, the first driving shaft (10) drives the first fixing part (1121) in the elastic assembly (112) to move upward, so that the elastic part (1123) is stretched.

5. The method of claim 4, wherein One end of the connecting rod (113) is rotatably connected with the first rolling shaft (8), and the other end is rotatably connected with the first driving shaft (10); in the step 2, the first rolling shaft (8) drives the first driving shaft (10) to synchronously go up through the connecting rod (113).

6. The method of claim 1, wherein In the step 3, the driving cylinder (7) is driven to make the bearing support (6) go down.

7. The method of claim 6, wherein In the step 3, the first driving shaft (10) is reset.

8. The method of claim 1, wherein In the step 4, the first driving shaft (10) and the second driving shaft (11) are driven to rotate in opposite directions at the same speed.

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