Method of integrated forging of a pipe section with asymmetric unequal diameter nozzles

Abstract

The application discloses an integrated forging method of a pipe joint section with asymmetric unequal-diameter nozzles, and belongs to the technical field of forging forming, and aims at solving the problems of high risk coefficient, low one-time qualified rate, complex and complicated rework, and large deformation of the pipe joint section in the prior art. In the method, the upper special-shaped cover plate and the lower special-shaped cover plate are used to press the blank, the upper end surface is formed with alternately arranged upper protrusions and upper grooves, the lower end surface is formed with alternately arranged lower protrusions and lower grooves, and the ring belt is divided into a plurality of pipe joint protrusions arranged along the circumference of the special-shaped blank. The upper flat cover plate and the lower flat cover plate are used to press the blank, a displacement is formed, flanging and punching are performed after the flanging pre-punching holes are processed on the pipe joint protrusions, and the inlet pipe joint, the outlet pipe joint and the injection pipe joint are formed. The application can be used for the integrated forging of the pipe joint section with asymmetric unequal-diameter nozzles.

Description

Technical Field

[0001] This invention belongs to the field of forging technology, and particularly relates to an integrated forging method for a pipe section with asymmetrical unequal diameter nozzles. Background Technology

[0002] The nozzle section is the largest and most complex cylindrical forging, including the nozzle cylinder body and the nozzle flange welded to it. The outer surface of the nozzle cylinder body is equipped with inlet nozzles, outlet nozzles, and safety injection nozzles. See [link / reference needed]. Figure 2 Because the inlet pipe, outlet pipe, and safety injection pipe are not on the same horizontal line and have different sizes, the shape of the pipe section is more complex.

[0003] Existing pipe sections are typically manufactured using a semi-integrated approach; see [link / reference]. Figure 1 This involves processing the pipe cylinder, inlet pipe, outlet pipe, and safety injection pipe separately. The inlet pipe installation port, outlet pipe installation port, and safety injection pipe installation port are processed on the pipe cylinder. The inlet pipe is inserted into the inlet pipe installation port and then welded. The outlet pipe installation port is inserted into the outlet pipe installation port and then welded. The safety injection pipe is inserted into the safety injection pipe installation port and then welded.

[0004] However, using the above manufacturing method results in a high risk factor for the weld seams, a low first-pass yield, and complex and tedious rework, leading to a significant increase in the manufacturing cycle. Furthermore, due to the large number of weld seams, the stress from these seams can cause substantial deformation of the pipe section. Engineering experience shows that even with anti-deformation welding, the deformation of the pipe section can still exceed 5mm. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide an integrated forging method for nozzle sections with asymmetrical unequal diameter nozzles, in order to solve the problems of high risk coefficient, low first-pass yield, complex and cumbersome rework, and large deformation of nozzle sections in the manufacturing of nozzle sections in the prior art, which usually adopts semi-integrated welding.

[0006] The objective of this invention is mainly achieved through the following technical solutions.

[0007] This invention provides an integrated forging method for a nozzle section with asymmetric unequal diameter nozzles, comprising the following steps:

[0008] Step 1: Provide a blank, which includes an integrally formed flange section and a cylindrical section. The flange section is used to form the pipe flange, and the cylindrical section is used to form the pipe cylinder. The outer wall of the cylindrical section near the flange section is provided with a ring band.

[0009] Step 2: Place the billet between the upper and lower shaped cover plates and press it so that the upper end face of the billet forms alternating upper protrusions and upper grooves, and the lower end face of the billet forms alternating lower protrusions and lower grooves. In the axial direction of the billet, the upper protrusions and lower grooves are positioned correspondingly, and the upper grooves and lower protrusions are positioned correspondingly, thus obtaining the shaped billet.

[0010] Step 3: Press the ring belt to divide it into multiple connecting tube protrusions arranged along the circumference of the irregular blank. The connecting tube protrusions correspond to the positions of the upper groove or upper protrusion, thus obtaining a blank with connecting tube protrusions.

[0011] Step 4: Place the billet with the nozzle protrusion between the upper and lower flat cover plates and press it. Among two adjacent nozzle protrusions, one moves upward and the other moves downward, forming a misalignment, and the misaligned billet is obtained.

[0012] Step 5: According to the position and size of the inlet pipe, outlet pipe and safety injection pipe, after machining the flanged pre-drilled holes on the pipe protrusion, perform flange punching to form the inlet pipe, outlet pipe and safety injection pipe. The outer wall of the flange section protrudes from the outer wall of the cylinder section to form the pipe flange, completing the integrated forging of the pipe section with asymmetrical nozzles of different diameters.

[0013] Furthermore, the following steps are included before step 1:

[0014] Step 1: Provide a double vacuum steel ingot, and sequentially compact, round, cut, upset and punch the double vacuum steel ingot to obtain a punched steel ingot;

[0015] Step II: The two ends of the punched steel ingot are drawn out to form a ring on the outer wall of the punched steel ingot. The thickness of the first end of the punched steel ingot is greater than the thickness of the second end of the punched steel ingot. The first end of the punched steel ingot is used as the flange section, and the ring and the second end are used as the cylinder section to obtain the billet.

[0016] Furthermore, step II is followed by the following steps:

[0017] The blank is placed in a mold with a groove on the inner wall, and the ring belt is placed in the groove to enlarge the hole in the blank. The groove wall shapes the ring belt.

[0018] Furthermore, the inner diameter of the billet is 2000-3000 mm, the outer diameter of the first end of the billet is 4000-4500 mm, and the outer diameter of the second end of the billet is 3500-4000 mm.

[0019] Furthermore, the outer diameter of the ring is 4800–5500.

[0020] Furthermore, the following steps are included between step 2 and step 3:

[0021] Expand the holes in irregularly shaped blanks.

[0022] Furthermore, the following steps are included between steps 4 and 5:

[0023] An integrated hammer or a flat hammer is used to enlarge the hole in the misaligned billet.

[0024] Furthermore, the hole is enlarged using a lever enlargement method.

[0025] Furthermore, the following steps are included between steps 4 and 5:

[0026] According to the position and size of the safety injection connector, the corresponding connector protrusion is elongated to reduce the outer diameter of the connector protrusion.

[0027] Furthermore, the outer diameter of the connecting pipe section is 5000-6000mm, the inner diameter is 4000-4500mm, and the height is 3500-4500mm.

[0028] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0029] The present invention provides an integrated forging method for pipe sections with asymmetrical nozzles of unequal diameters. This method combines various techniques, including using specially structured billets, upper and lower irregularly shaped cover plates, upper and lower flat cover plates, stamping, and flanging / punching, to achieve integrated forming of the pipe section. The pipe flange, pipe cylinder, inlet pipe, outlet pipe, and safety injection pipe are forged as a single unit, with no weld seams. This improves the integrity of the pipe section, reduces manufacturing costs, and shortens the manufacturing cycle. Furthermore, the absence of welding during the entire forging process ensures minimal deformation of the pipe section, achieving near-net-shape forming, i.e., contour forging, which significantly reduces the weight of the billet.

[0030] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained through the embodiments described and the accompanying drawings, which are particularly pointed out. Attached Figure Description

[0031] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0032] Figure 1 This is a flowchart of a method for forming a nozzle section with asymmetric unequal diameter in the prior art;

[0033] Figure 2 This is a structural schematic diagram of the pipe-connecting section;

[0034] Figure 3 A flowchart of an integrated forging method for a nozzle section with asymmetric unequal diameter provided by the present invention;

[0035] Figure 4 A schematic diagram of the external flanging device in the integrated forging method for a pipe section with asymmetric unequal diameter nozzles provided by the present invention.

[0036] Figure 5 A schematic diagram of the crossbeam structure in the integrated forging method for the nozzle section with asymmetric unequal diameter provided by the present invention;

[0037] Figure 6 A schematic diagram of the flanging punch assembly in the integrated forging method for pipe sections with asymmetrical unequal diameter nozzles provided by the present invention.

[0038] Figure 7 This is a schematic diagram of the nozzle flanging device in the integrated forging method for pipe sections with asymmetrical unequal diameter nozzles provided by the present invention.

[0039] Figure label:

[0040] 1-Slipped blank; 2-Horizontal beam; 201-Assembly groove; 202-Vertical pin; 203-Beam body; 3-Flanged punch assembly; 301-Connecting plate; 302-First horizontal pin; 303-Connecting vertical pin; 304-Second horizontal pin; 305-Vertical punch; 306-Connecting protrusion; 4-Supporting lower die; 401-Lower die cavity; 402-Supporting cylinder; 5-Press; 6-Hammer; 7-First wedge; 8-Second wedge; 9-Third wedge; 10-Horizontal punch. Detailed Implementation

[0041] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0042] Example 1

[0043] This embodiment provides an integrated forging method for a nozzle section with asymmetric unequal diameter nozzles. See [link to documentation]. Figure 3 It includes the following steps:

[0044] Step 1: Provide a blank, which includes an integrally formed flange section and a cylindrical section. The flange section is used to form the pipe flange, and the cylindrical section is used to form the pipe cylinder. The inner diameter of the blank remains unchanged, the thickness of the flange section is greater than the thickness of the cylindrical section, and a ring band is provided on the outer wall of the cylindrical section near the flange section.

[0045] Step 2: Place the billet between the upper and lower shaped cover plates and press it so that the upper end face of the billet forms alternating upper protrusions and upper grooves, and the lower end face of the billet forms alternating lower protrusions and lower grooves. In the axial direction of the billet, the upper protrusions and lower grooves are positioned correspondingly, and the upper grooves and lower protrusions are positioned correspondingly, thus obtaining the shaped billet.

[0046] Step 3: Press the ring belt using a plum blossom pressing method to divide the ring belt into multiple connecting tube protrusions set along the circumference of the irregular blank. The connecting tube protrusions correspond to the positions of the upper groove or upper protrusion, thus obtaining a blank with connecting tube protrusions.

[0047] Step 4: Place the billet with the nozzle protrusion between the upper and lower flat cover plates and press it. Among two adjacent nozzle protrusions, one moves upward and the other moves downward, forming a misalignment. That is, the horizontal positions of two adjacent nozzle protrusions are different, resulting in misaligned billet 1.

[0048] Step 5: According to the position and size of the inlet pipe, outlet pipe and safety injection pipe, after machining the flanged pre-drilled holes on the pipe protrusion, perform flange punching to form the inlet pipe, outlet pipe and safety injection pipe. The outer wall of the flange section protrudes from the outer wall of the cylinder section to form the pipe flange, completing the integrated forging of the pipe section with asymmetrical nozzles of different diameters.

[0049] It should be noted that the above-mentioned integrated forging method can be used to forge large-size pipe sections in one piece. For example, the outer diameter of the pipe section is 5000-6000mm, the inner diameter is 4000-4500mm, and the height is 3500-4500mm.

[0050] Compared with existing technologies, the integrated forging method for pipe sections with asymmetrical unequal diameter nozzles provided in this embodiment combines various methods such as special structured billets, upper and lower irregular-shaped cover plates, upper and lower flat cover plates, stamping, and flanging punching to achieve integrated forming of the pipe section. The pipe flange, pipe cylinder, inlet pipe, outlet pipe, and safety injection pipe are forged as a whole, with no weld seams in the entire pipe section. This improves the integrity of the pipe section, reduces manufacturing costs, and shortens the manufacturing cycle. In addition, no welding is used in the entire forging process, ensuring that the pipe section will not deform significantly, achieving near-net-shape forming, i.e., contour forging, which greatly reduces the weight of the billet.

[0051] It should be noted that for a pipe section structure consisting of 1 pipe cylinder, 1 pipe flange, 2 inlet pipes, 4 outlet pipes, and 2 safety injection pipes, the above-mentioned integrated forging method for pipe sections with asymmetrical nozzles of unequal diameters can be used to forge a total of 10 forgings as a whole, saving 9 welds.

[0052] Considering that fewer hole-reaming passes would result in excessive deformation per pass, the following steps are included between steps 2 and 3 above:

[0053] Enlarging of irregularly shaped blanks (e.g., reaming with a lever).

[0054] The following steps also apply between steps 4 and 5 above:

[0055] An integrated hammerhead 6 or a flat hammerhead 6 is used to enlarge the hole in the misaligned blank 1.

[0056] In this way, by expanding the hole multiple times, the inner hole of the billet can be forged to the final size in multiple stages, reducing the deformation of each pass, ensuring the uniformity of the microstructure of the pipe section with asymmetrical nozzles of unequal diameters, and reducing the generation of defects.

[0057] Considering that the outer diameter of the safety injection connector is smaller than the outer diameters of the inlet connector and the outlet connector, the following steps are also included between steps 4 and 5 above:

[0058] According to the position and size of the injection connector, the corresponding connector protrusion is elongated (for example, the flat hammer head 6 is elongated) to reduce the outer diameter of the connector protrusion.

[0059] In order to obtain the blank with the special structure in step 1 above, the following steps are included before step 1:

[0060] Step 1: Provide a double vacuum steel ingot, and sequentially compact, round, cut, upset and punch the double vacuum steel ingot to obtain a punched steel ingot;

[0061] Step II: The two ends of the punched steel ingot are drawn out to form a ring on the outer wall of the punched steel ingot. The thickness of the first end is greater than that of the second end. The first end is used as a flange section, and the ring and the second end are used as a cylinder section to obtain the billet.

[0062] In order to ensure the quality of the billet, the following steps are included after step II above:

[0063] The blank is placed in a mold with a groove on the inner wall, and the ring belt is placed in the groove to enlarge the hole in the blank. The groove wall shapes the ring belt.

[0064] For example, the inner diameter of the billet is 2000-3000 mm, the outer diameter of the first end of the billet is 4000-4500 mm, the outer diameter of the second end of the billet is 3500-4000 mm, and the outer diameter of the ring belt is 4800-5500 mm.

[0065] For the flanging and punching in step 5, due to space limitations in the press, large pipe sections cannot be completed inside the press. The following two flanging methods can be used:

[0066] One type of flanging method is external flanging, which involves placing the pre-fabricated flanged hole protrusion outside the press and using a lifting beam to transfer the press load for external flanging.

[0067] Specifically, regarding the structure of the external flange device, see [link to documentation]. Figures 4 to 6 The system includes a press 5, a crossbeam 2, and two sets of identical flanging punch assemblies 3. The middle position of the crossbeam 2 is fixed to the press 5, and both ends of the crossbeam 2 extend outward to the outside of the press 5. The two sets of flanging punch assemblies 3 are detachably connected to both ends of the crossbeam 2. Along the length of the crossbeam 2, one flanging punch assembly 3 is located in one misaligned blank 1 and aligned with the flanging pre-drilled hole, and the other flanging punch assembly 3 is located in another misaligned blank 1 and aligned with the flanging pre-drilled hole. During flanging and punching, the press 5 drives the crossbeam 2 to move downward, and the flanging punch assemblies 3 located at both ends of the crossbeam 2 can simultaneously perform flanging and punching on the two misaligned blanks 1. In this way, on the one hand, the crossbeam 2 passes through the column of the press 5 to form the working space, and the flanging punch assembly 3 is located at both ends of the crossbeam 2 and is located outside the press 5. Therefore, when flanging and punching the misaligned blank 1, it will not be restricted by the space of the press 5. On the other hand, by setting the flanging punch assembly 3 on both sides of the crossbeam 2, it is possible to flanging and punching two sets of misaligned blank 1 at the same time, thereby improving the flanging and punching efficiency and reducing production costs.

[0068] For example, the aforementioned crossbeam 2 includes a beam body 203, an assembly groove 201, and a vertical pin 202. The flange punch assembly 3 includes a connecting plate 301, a vertical punch 305, and a connecting protrusion 306 located on the connecting plate 301 facing one end of the beam body 203. The middle part of the beam body 203 is connected to the press 5. The assembly groove 201 is opened laterally along the beam body 203 on the sides of both ends of the beam body 203. The connecting protrusion 306 is inserted into the assembly groove 201. The vertical pin 202 passes through the assembly groove 201 and the connecting protrusion 306 longitudinally along the beam body 203. The vertical punch 305 is located below the connecting plate 301. In this way, the crossbeam 2 and the flanging punch assembly 3 with this structure can, on the one hand, firmly fix the vertical punch 305 through the connecting plate 301, and realize the effective transmission of force between the press 5 and the crossbeam 2 and the flanging punch assembly 3; on the other hand, it can realize the detachable connection between the crossbeam 2 and the flanging punch assembly 3 and the vertical punch 305 and the connecting plate 301, which facilitates the assembly and replacement of the flanging punch assembly 3 and the vertical punch 305.

[0069] It should be noted that, in order to facilitate demolding of the vertical punch 305 after flanging and punching, the vertical punch 305 includes a cylindrical part and a peach-shaped part; wherein, the first end of the cylindrical part is detachably connected to the connecting plate 301, and the second end of the cylindrical part is connected to the peach-shaped part; the diameter of the cylindrical part is smaller than the maximum diameter of the peach-shaped part; when flanging and punching, the press 5 drives the crossbeam 2 to press down, and the crossbeam 2 transmits the shear force received to the connecting plate 301, and the connecting plate 301 drives the vertical punch 305 to flanging and punch the tapered nozzle of the cylindrical forging with side nozzle to be flanged. It should be noted that the diameter of the cylindrical part is smaller than the maximum diameter of the peach-shaped part, and the peach-shaped part adopts a peach-shaped design with a "large head and small body", which facilitates demolding of the vertical punch 305 after the nozzle is formed.

[0070] It should be noted that, for the connection between the vertical punch 305 and the connecting plate 301, for example, the above-mentioned flange punch assembly 3 also includes a connecting pin 303, a first horizontal pin 302 and a second horizontal pin 304. The connecting pin 303 passes through the connecting plate 301 along the height direction of the connecting plate 301. The length of the connecting pin 303 is greater than the height of the connecting plate 301, so that the two ends of the connecting pin 303 protrude from the upper end face and the lower end face of the connecting plate 301, respectively. The first horizontal pin 302 passes through the upper end face of the connecting pin 303 along the transverse direction of the connecting plate 301, and the second horizontal pin 304 passes through the lower end face of the connecting pin 303 along the transverse direction of the connecting plate 301. In this way, the vertical pin 303 is detachably connected to the vertical punch 305. When the vertical punch 305 gets stuck with the misaligned blank 1, the first horizontal pin 302 and the second horizontal pin 304 can be quickly pulled out to complete the rapid separation of the vertical punch 305 from the connecting plate 301, so that the vertical punch 305 remains in the misaligned blank 1. After the misaligned blank 1 cools down, the vertical punch 305 can be removed.

[0071] It is understood that the aforementioned external flanging device also includes a supporting lower mold 4, which includes a lower mold cavity 401 and a supporting cylinder 402. The lower mold cavity 401 is used for the misaligned blank 1, and can ensure the placement position of the misaligned blank 1 and the size of the nozzle during flanging. The supporting cylinder 402 is used for forming the outer wall of the nozzle, and the inner wall of the supporting cylinder 402 is conformal with the outer wall of the inlet nozzle, outlet nozzle, or injection nozzle. On the one hand, if the supporting cylinder 402 is not provided, the ends of the inlet nozzle, outlet nozzle, and injection nozzle will be wavy and uneven after flanging. With the supporting cylinder 402, the supporting cylinder 402 can back-express the high point of the nozzle of the blank during flanging, making the nozzle end flat. At the same time, it can also realize the direct forming of the inlet nozzle, outlet nozzle, and injection nozzle, ensuring the accuracy of flanging and punching.

[0072] Based on the structure of the external flanging device described above, step 5 of the flanging and punching process includes the following steps:

[0073] Step A: Fix the crossbeam 2 to the press 5;

[0074] Step B: Insert the connecting pin 303 into the connecting plate 301, insert the first horizontal pin 302 into the upper end of the connecting pin 303, and insert the second horizontal pin 304 into the lower end of the connecting pin 303 to complete the assembly of the connecting plate 301 and the vertical punch 305.

[0075] Step C: Insert the connecting protrusion 306 into the assembly slot 201, and ensure that the second vertical pin hole 307 is aligned with the vertical pin 202. At this time, insert the vertical pin 202 into the connecting plate 301 to complete the assembly of the connecting plate 301 and the crossbeam 2.

[0076] Step D: Place the lower mold cavity 401 in the designated position and place the support cylinder 402 inside the lower mold cavity 401;

[0077] Step E: Place the two misaligned blanks 1 into the two lower mold cavities 401 respectively, and align the vertical punch 305 with the flange pre-made hole;

[0078] Step F: Press 5 presses down, simultaneously completing the flanging punching of one flanging pre-made hole in each of the two misaligned blanks 1, then resets press 5 and demolds the vertical punch 305.

[0079] Step G: Rotate the shifted blank 1 so that the vertical punch 305 is aligned with the new flange pre-made hole. Repeat step F until all inlet pipes, outlet pipes and injection pipes are formed.

[0080] Another flanging method is wedge block extrusion flanging. Specifically, for the structure of the nozzle flanging device, see [link to documentation]. Figure 7 The assembly includes a hammer head 6 and a flanging punching assembly, which includes a wedge and a transverse punch 10. The punching end of the transverse punch 10 is aligned with the flanging pre-drilled hole, and the connecting end of the transverse punch 10 is in contact with the wedge. During flanging punching, the hammer head 6 moves downward to drive the wedge to move towards the offset blank 1, so that the punching end of the punch is inserted into the flanging pre-drilled hole, thereby realizing flanging punching.

[0081] In order to simultaneously perform flanging and punching on multiple flanging pre-formed holes, the number of the above-mentioned flanging and punching components is multiple. The multiple flanging and punching components are evenly arranged relative to the axis of the hammer head 6. The downward movement of the hammer head 6 can simultaneously drive multiple wedges to move towards the offset blank 1, thereby realizing the flanging and punching of multiple flanging pre-formed holes.

[0082] Considering the dimensions of the hammer head 6, the wedge block, and the transverse punch 10, as well as the quality of the flanging punch, the number of the aforementioned wedge blocks is multiple, for example, three, including a first wedge block 7, a second wedge block 8, and a third wedge block 9 arranged sequentially. Thus, the actual flanging punching process is as follows:

[0083] Step A': Place the shifted blank 1 in the lower die, align the punching end of the transverse punch 10 with the pre-made flanged hole, and place the first wedge 7 at the connecting end of the transverse punch 10.

[0084] Step B': The hammer head 6 moves down to drive the first wedge block 7 and the transverse punch 10 to move towards the offset blank 1, so that the transverse punch 10 is inserted into the flange pre-made hole, completing the first hammer;

[0085] Step C': The hammer head 6 moves upward, placing the second wedge 8 between the first wedge 7 and the transverse punch 10;

[0086] Step D': The hammer head 6 moves down to drive the first wedge block 7, the second wedge block 8 and the transverse punch 10 to move towards the offset blank 1, so that the depth of the transverse punch 10 inserted into the flange pre-made hole increases, and the second hammer is completed;

[0087] Step E': The hammer head 6 moves upward, placing the third wedge 9 between the second wedge 8 and the first wedge 7;

[0088] Step D': The hammer head 6 moves down to drive the first wedge block 7, the third wedge block 9, the second wedge block 8 and the transverse punch 10 to move towards the shifted blank 1, so that the depth of the transverse punch 10 inserted into the flanging pre-made hole increases again, completing the third hammer, that is, completing the flanging punch.

[0089] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An integrated forging method for a pipe section with asymmetrical unequal diameter nozzles, characterized in that, Includes the following steps: Step 1: Provide a blank, the blank comprising an integrally formed flange section and a cylindrical section, the flange section being used to form a pipe flange, the cylindrical section being used to form a pipe cylinder, and the outer wall of the cylindrical section near the flange section having an annular band. Step 2: Press the billet between the upper and lower shaped cover plates to form alternating upper protrusions and upper grooves on the upper end face of the billet, and alternating lower protrusions and lower grooves on the lower end face of the billet. In the axial direction of the billet, the upper protrusions and lower grooves are positioned correspondingly, and the upper grooves and lower protrusions are positioned correspondingly, thus obtaining a shaped billet. Step 3: Press the ring belt to divide it into multiple connecting tube protrusions arranged along the circumference of the irregular blank. The connecting tube protrusions correspond to the positions of the upper groove or upper protrusion, thus obtaining a blank with connecting tube protrusions. Step 4: Place the billet with the nozzle protrusion between the upper and lower flat cover plates and press it. Among two adjacent nozzle protrusions, one moves upward and the other moves downward, forming a misalignment, and the misaligned billet is obtained. Step 5: According to the position and size of the inlet pipe, outlet pipe and safety injection pipe, after machining the flanged pre-made holes on the pipe protrusion, perform flange punching to form the inlet pipe, outlet pipe and safety injection pipe. The outer wall of the flange section protrudes from the outer wall of the cylinder section to form the pipe flange, completing the integrated forging of the pipe section with asymmetrical nozzles of unequal diameter.

2. The integrated forging method for the pipe section with asymmetrical unequal diameter nozzles according to claim 1, characterized in that, The following steps are included before step 1: Step 1: Provide a double vacuum steel ingot, and sequentially compact, round, cut, upset and punch the double vacuum steel ingot to obtain a punched steel ingot; Step II: The two ends of the punched steel ingot are drawn out to form a ring on the outer wall of the punched steel ingot. The thickness of the first end of the punched steel ingot is greater than the thickness of the second end of the punched steel ingot. The first end of the punched steel ingot serves as a flange section, and the ring and the second end serve as a cylinder section to obtain the billet.

3. The integrated forging method for a pipe section with asymmetrical unequal diameter nozzles according to claim 2, characterized in that, Following step II, the following steps are also included: The blank is placed in a mold with a groove on the inner wall, and the ring belt is placed in the groove to enlarge the hole of the blank. The groove wall shapes the ring belt.

4. The integrated forging method for a pipe section with asymmetrical unequal diameter nozzles according to claim 3, characterized in that, The inner diameter of the billet is 2000-3000mm, the outer diameter of the first end of the billet is 4000-4500mm, and the outer diameter of the second end of the billet is 3500-4000mm.

5. The integrated forging method for a pipe section with asymmetrical unequal diameter nozzles according to claim 3, characterized in that, The outer diameter of the ring is 4800 to 5500.

6. The integrated forging method for a pipe section with asymmetrical unequal diameter nozzles according to claim 1, characterized in that, The following steps are also included between step 2 and step 3: Expand the holes in irregularly shaped blanks.

7. The integrated forging method for a pipe section with asymmetrical unequal diameter nozzles according to claim 1, characterized in that, The following steps are also included between step 4 and step 5: An integrated hammer or a flat hammer is used to enlarge the hole in the misaligned billet.

8. The integrated forging method for a nozzle section with asymmetrical unequal diameter nozzles according to claim 6 or 7, characterized in that, The hole enlargement was performed using a lever enlargement method.

9. The integrated forging method for a pipe section with asymmetrical unequal diameter nozzles according to claim 1, characterized in that, The following steps are also included between step 4 and step 5: According to the position and size of the safety injection connector, the corresponding connector protrusion is elongated to reduce the outer diameter of the connector protrusion.

10. The integrated forging method for a pipe section with asymmetrical unequal diameter nozzles according to any one of claims 1 to 9, characterized in that, The outer diameter of the connecting pipe section is 5000-6000mm, the inner diameter is 4000-4500mm, and the height is 3500-4500mm.

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