Manufacturing method of rear catheter

Abstract

A manufacturing method of a rear guide pipe comprises the steps that the hub body and the shell assembly are assembled firstly, then the hub body is welded, then the shell assembly body is assembled, then the shell assembly body is welded, then the shell assembly outer seal is assembled, then the shell assembly outer seal is welded, and then the hub body is placed in a machining tool. Then the shell assembly is arranged outside the machining tool in a sleeving mode, then the rear guide vane is fixed to the machining tool, and then welding is conducted; the rear guide vane is fixed through the machining tool, bolts do not need to be used for fixing the rear guide vane in a narrow space around the machining tool, so that the assembling difficulty is reduced, the step of removing the bolts after welding is omitted, and the production efficiency is improved. Therefore, the design is relatively low in assembly difficulty and relatively high in production efficiency.

Description

Technical Field

[0001] The invention relates to a manufacturing method, belongs to the field of motor propulsion device parts, and in particular to a manufacturing method of a rear duct. Background Art

[0002] In the motor propulsion device, the stator of the motor is arranged inside the duct, and the rotor of the motor and the blades of the duct are integrated into one. When the motor is working, it can directly drive the blades to do work to realize the navigation of the ship; the blades include a front duct and a rear duct. The rear duct has a complex appearance and many parts, so there is a certain degree of difficulty in the manufacture of the rear duct.

[0003] A Chinese patent application with application number 202210581310.1 and application date May 26, 2022 discloses a lightweight composite structure duct and a manufacturing method thereof, comprising a mounting bracket located at a central position, wherein the outer circumferential surface of the mounting bracket is evenly distributed with a plurality of support bars in the circumferential direction, a step hole is arranged inside the mounting bracket, and an inner skin is also included, one end of the inner skin is provided with evenly distributed notches in the circumferential direction, each notch corresponds to a support bar, and internal longitudinal ribs are evenly distributed on the outer circumferential surface of the inner skin, and the ends of the internal longitudinal ribs are locked with the support bars by bolts; an outer skin is wrapped on the outside of the internal longitudinal ribs, and the outer skin is provided with outer skin water-permeable holes; a constrained damping layer is coated on both the inner skin and the outer skin; a porous rubber sound-absorbing structure is installed in the internal space of the duct to form a sound-absorbing layer; through the action of the water-permeable holes, the interior of the duct will be filled with water after the duct is immersed in water, so that the pressure inside and outside the duct is balanced. Although this design can make a rear duct, it still has the following defects: In this design, the mounting bracket and the inner skin are first placed opposite to each other, and then holes are punched in the mounting bracket and the inner skin to fix the support bar with bolts. However, in this process, the space between the support bar, the mounting bracket and the inner skin is small, which makes it difficult to fix the support bar with bolts. Therefore, the assembly process is more difficult, resulting in lower production efficiency of the rear duct.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the application, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects and problems of the prior art, such as high assembly difficulty and low production efficiency, and to provide a method for manufacturing a rear conduit with low assembly difficulty and high production efficiency.

[0006] To achieve the above objectives, the technical solution of the present invention is: A method for manufacturing a rear conduit, the rear conduit comprising a hub body and a shell assembly, the method comprising the following steps: Step 1: Assemble the hub body: first assemble the front flange plate, the hub body rib plate and the hub shaft, then perform tack welding on the connection between the front flange plate, the hub body rib plate and the hub shaft to fix the front flange plate, the hub body rib plate and the hub shaft, then assemble the rear flange plate and the hub body rib plate, then perform tack welding on the connection between the rear flange plate and the hub body rib plate to fix the rear flange plate and the hub body rib plate; Step 2: Welding the hub body: first weld the welds between the hub body rib plate and the front flange plate in sequence, then weld the welds between the hub body rib plate and the rear flange plate in sequence, and then obtain the hub body; Step 3: Assemble the main body of the shell assembly: first place the inner lining plate on the assembly platform, then place the inner lining ring on the top of the inner lining plate, then perform tack welding on the connection between the inner lining ring and the inner lining plate to fix the inner lining ring and the inner lining plate, then place multiple first longitudinal rib plates on the inner lining plate in sequence, connect one side of the first longitudinal rib plate to the outer surface of the inner lining ring, then perform tack welding on the connection between the first longitudinal rib plate and the inner lining plate to fix the first longitudinal rib plate and the inner lining plate, then make the first transverse ring rib fall along the outer surface of the inner lining ring to the top of the first longitudinal rib plate, then place multiple second longitudinal rib plates on the first transverse ring rib in sequence, then make the second transverse ring rib fall along the outer surface of the inner lining ring to the top of the second longitudinal rib plate, then place multiple third longitudinal rib plates on the second transverse ring rib in sequence, then perform tack welding on the connection between the first transverse ring rib, the second longitudinal rib plate, the second transverse ring rib, and the third longitudinal rib plate; Step 4: Weld the main body of the shell assembly: first, weld the welds between the inner lining ring, the inner lining plate, the first longitudinal rib plate, the first transverse ring rib, the second longitudinal rib plate, the second transverse ring rib, and the third longitudinal rib plate in the specified order, and then obtain the main body of the shell assembly; Step 5: Assemble the outer seal of the housing assembly: first assemble the inner surface of the first outer seal plate with the outer surface of the second longitudinal rib plate, and then assemble the inner surface of the second outer seal plate with the outer surface of the third longitudinal rib plate; Step 6: Perform outer seal welding of the shell assembly: first weld the weld between the first outer seal plate and the second longitudinal rib plate in sequence, then weld the weld between the second outer seal plate and the third longitudinal rib plate in sequence, and then obtain the shell assembly; Step 7: Assemble the rear duct: first place the processing tooling on the assembly platform, then place the hub body in the inner hole of the processing tooling, then put the shell assembly on the outside of the processing tooling, then assemble the rear guide vane with the processing tooling, and then perform positioning welding on the connection between the rear guide vane and the hub body and the shell assembly; Step 8: Weld the rear duct: Weld the connection between the rear guide vane and the hub body and the outer shell assembly in the specified order to obtain the rear duct.

[0007] In the seventh step, the rear guide vane and the processing tooling are assembled by first placing the rear guide vane in the guide vane mounting groove of the processing tooling, then using a U-shaped horse plate to press all the rear guide vanes in turn, and then using a latch to insert the U-shaped horse plate and the process block of the rear guide vane to fix the U-shaped horse plate and the process block.

[0008] In the seventh step, the processing tool is placed on the assembly platform to first make the flatness of the bottom plate of the processing tool meet the requirements, and then place the processing tool on the assembly platform; In the seventh step, the outer shell component is put on the outside of the processing tooling by first putting the outer shell component on the outside of the processing tooling, then positioning the inner hole of the outer shell component and multiple ribs on the outside of the processing tooling, and then making the concentricity of the inner hole of the outer shell component and the aforementioned ribs meet the requirements, thereby ensuring that the concentricity of the outer shell component and the hub body meets the requirements.

[0009] In the eighth step, the welding of the connection between the rear guide vane and the hub body and the outer shell assembly in the specified order is to first randomly select a weld at the connection between the rear guide vane and the hub body and the outer shell assembly for welding, and then randomly select a weld at the connection between the rear guide vane and the hub body and the outer shell assembly that is symmetrical to the aforementioned rear guide vane for welding, and then randomly select a weld at the connection between the rear guide vane and the hub body and the outer shell assembly for welding, and then select a weld at the connection between the rear guide vane and the hub body and the outer shell assembly that is symmetrical to the aforementioned rear guide vane for welding, and repeat the above process until all the welds at the connection between the rear guide vane and the hub body and the outer shell assembly are welded.

[0010] In the third step, placing the lining ring on the top of the lining plate is placing the lining ring on the top of the lining plate, and the height from the bottom of the lining plate to the top of the lining ring is a first vertical tolerance, and the first vertical tolerance is less than or equal to one millimeter; In the third step, placing the plurality of first longitudinal ribs on the inner lining plate in sequence is to first draw machining lines of the plurality of first longitudinal ribs, and then placing the plurality of first longitudinal ribs on the inner lining plate in sequence according to the machining lines, wherein the deviation between all the first longitudinal ribs and the machining lines is less than or equal to 0.5 mm; In the third step, making the first transverse ring rib fall along the outer surface of the inner lining ring to the top of the first longitudinal rib plate is to make the first transverse ring rib fall along the outer surface of the inner lining ring to the top of the first longitudinal rib plate, and the bottom of the first transverse ring rib to the top of the inner lining plate is the second vertical tolerance, and the second vertical tolerance is less than or equal to one millimeter.

[0011] In the third step, placing the plurality of second longitudinal ribs on the first transverse annular ribs in sequence is to first draw machining lines of the plurality of second longitudinal ribs, and then sequentially place the plurality of second longitudinal ribs on the first transverse annular ribs, wherein the deviation between all the second longitudinal ribs and the machining lines is less than or equal to 0.5 mm; In the third step, the second transverse annular rib is made to fall along the outer surface of the inner lining ring to the top of the second longitudinal rib plate, and the bottom of the second transverse annular rib to the top of the first transverse annular rib is the third vertical tolerance, and the third vertical tolerance is less than or equal to one millimeter; In the third step, placing the plurality of third longitudinal ribs on the second transverse ring rib in sequence is to first draw machining lines of the plurality of third longitudinal ribs, and then place the plurality of third longitudinal ribs on the second transverse ring rib in sequence, wherein the deviation between the third longitudinal ribs and the machining lines is less than or equal to 0.5 mm.

[0012] In the fourth step, the welds between the inner lining ring, the inner lining plate, the first longitudinal rib plate, the first transverse ring rib, the second longitudinal rib plate, the second transverse ring rib and the third longitudinal rib plate are welded in sequence in the specified order: first, the first weld between the inner lining ring and the inner lining plate is welded, and then the second weld between the first longitudinal rib plate and the inner lining plate, the first transverse ring rib and the inner lining ring is welded, and then the third weld between the inner lining ring and the first transverse ring rib is welded, and then the fourth weld between the second longitudinal rib plate and the first transverse ring rib, the second transverse ring rib and the inner lining ring is welded, and then the fifth weld between the inner lining ring and the second transverse ring rib is welded, and then the sixth weld between the third longitudinal rib plate and the second transverse ring rib and the inner lining ring is welded.

[0013] In the third step, placing the plurality of first longitudinal ribs on the inner lining plate in sequence is first fixing the annular support inside the inner hole of the inner lining ring, and then placing the plurality of first longitudinal ribs on the inner lining plate in sequence; In the fourth step, the outer shell component body is obtained by first removing the annular support and then obtaining the outer shell component body.

[0014] In the first step, the front flange plate, the hub body rib plate and the hub shaft are assembled by first drawing an assembly line of the hub body rib plate on the front flange plate, and then assembling the front flange plate, the hub body rib plate and the hub shaft; In the first step, the rear flange plate and the hub body rib plate are assembled by first drawing an assembly line of the hub body rib plate on the rear flange plate, and then assembling the rear flange plate and the hub body rib plate.

[0015] In the fourth step, obtaining the shell component body is firstly obtaining the shell component body, and then performing stress annealing on the shell component body; In the eighth step, the rear conduit is obtained by first obtaining the rear conduit and then performing stress annealing on the rear conduit.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In a method for manufacturing a rear duct of the present invention, the method comprises the following steps: the first step: assembling the hub body; the second step: welding the hub body; the third step: assembling the main body of the shell component; the fourth step: welding the main body of the shell component; the fifth step: assembling the outer seal of the shell component; the sixth step: welding the outer seal of the shell component; the seventh step: assembling the rear duct: first placing the processing tool on the assembly platform, then placing the hub body inside the processing tool, then sleeve the shell component on the outside of the processing tool, then fix the rear guide vane on the processing tool, and then perform positioning welding; the eighth step: welding the rear duct. The advantages of the present invention also include: First point: Assemble the hub body first, then assemble the shell assembly, then use the processing tooling to position the hub body and the shell assembly, and then fix the rear guide vane with the processing tooling, and then weld; Use the processing tooling to fix the rear guide vane, and there is no need to drill holes in a small space and then use bolts to fix the rear guide vane, so the assembly difficulty is reduced. After the rear guide vane is welded with the hub body and the shell assembly, there is no need to remove the bolts, so the production efficiency is increased by 30%; Second point: the rear duct is divided into a hub body and a shell assembly, and the hub body and the shell assembly are assembled separately, so the assembly of the hub body and the shell assembly does not affect each other, making the assembly effect of the hub body and the shell assembly stable, thereby improving the assembly quality of the rear duct; Therefore, the present invention has low assembly difficulty and high production efficiency.

[0017] 2. In a method for making a rear duct of the present invention, in the seventh step, the flatness of the processing tooling is first made to meet the requirements, and then the hub body is located inside the processing tooling, and then the outer shell assembly and the rib plate of the processing tooling are positioned so that the outer shell assembly and the hub body meet the concentricity requirements to improve the assembly quality of the rear duct; then the rear guide vane is placed in the guide vane installation groove of the processing tooling, and then the rear guide vane is fixed with a U-shaped horse plate and a latch; the guide vane installation groove carries the rear guide vane from below the rear guide vane, and the U-shaped horse plate presses the rear guide vane from above the rear guide vane to form a fixation for the rear guide vane, and then the latch is inserted into the process block of the rear guide vane and the U-shaped horse plate to further improve the fixing effect. Therefore, the present invention has a better fixing effect on the rear guide vane.

[0018] 3. In a method for manufacturing a rear guide vane of the present invention, in the eighth step, welding is first performed on a weld seam of a random rear guide vane, and then welding is performed on a weld seam on a rear guide vane symmetrically distributed with the rear guide vane, and the aforementioned process is repeated until the welding of all rear guide vanes is completed; the rear guide vanes are welded in such a sequence, which ensures that the temperature on the rear guide vanes is normal, and helps to maintain stable welding quality. If all weld seams on a rear guide vane are welded at one time, the temperature on the rear guide vane will increase abnormally, and the welding quality of the rear guide vane will decrease. Therefore, the welding effect of the present invention is better.

[0019] 4. In the manufacturing method of a rear duct of the present invention, in the fifth step, the vertical tolerance of the inner liner ring is less than or equal to one millimeter, the deviation between the first longitudinal rib plate, the second longitudinal rib plate, and the third longitudinal rib plate and the machined scale line is less than or equal to 0.5 millimeters, and the vertical tolerance of the first transverse ring rib and the second transverse ring rib is less than or equal to one millimeter, which ensures the accurate positioning of the parts, thereby ensuring the quality of the rear duct is good; in the third step, welding is performed in the order of the first weld, the second weld, the third weld, the fourth weld, the fifth weld, the sixth weld, the seventh weld, and the eighth weld, which ensures the temperature stability during welding, thereby making the welding quality of the shell component body good. Therefore, the quality of the rear duct of the present invention is good.

[0020] 5. In the manufacturing method of the rear duct of the present invention, in the third step, the annular support is first fixed to the inner hole of the inner liner ring, and then the first longitudinal rib plate is fixed. In the fourth step, the annular support is removed after welding. The annular support keeps the inner liner ring round so that it does not deform in the subsequent assembly and welding steps. Therefore, the roundness of the outer shell assembly in the present invention is better.

[0021] 6. In the manufacturing method of the rear duct of the present invention, in the first step, the assembly line is first drawn on the front flange plate, and then the front flange plate, the hub body rib plate and the hub shaft are assembled and fixed, and then the rear flange plate assembly line is drawn, and then the rear flange plate is assembled. The assembly line assists in assembling parts, so that the parts are accurately positioned, thereby improving the assembly quality. Therefore, the assembly effect of the present invention is better.

[0022] 7. In the manufacturing method of the rear conduit of the present invention, the fourth step and the eighth step need to perform stress annealing, which can eliminate the stress in the rear conduit and the shell assembly, thereby preventing the rear conduit and the shell assembly from deformation and cracking, making the rear conduit more stable and reliable in subsequent application processes. Therefore, the present invention has strong stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 yes Figure 1 Schematic diagram of the structure of the mid-posterior duct.

[0025] Figure 3 yes Figure 1 Schematic diagram of the structure of the central hub.

[0026] Figure 4 yes Figure 3 main view.

[0027] Figure 5 yes Figure 4 Top view of the .

[0028] Figure 6yes Figure 1 Schematic diagram of the structure of the middle liner ring.

[0029] Figure 7 yes Figure 6 Schematic diagram of the structure of the middle lining plate.

[0030] Figure 8 yes Figure 1 Schematic diagram of the structure of the first longitudinal rib plate.

[0031] Fig. 9 yes Figure 8 Schematic diagram of the structure of the first transverse ring reinforcement.

[0032] Fig.10 yes Figure 1 Schematic diagram of the structure of the second longitudinal rib plate.

[0033] Fig.11 yes Fig.10 Schematic diagram of the structure of the second longitudinal rib plate.

[0034] Fig.12 yes Figure 1 Schematic diagram of the structure of the third longitudinal rib plate.

[0035] Fig.13 yes Fig.12 Schematic diagram of the structure of the first weld.

[0036] Fig.14 yes Fig.12 Schematic diagram of the structure of the second weld.

[0037] Fig.15 yes Figure 1 Schematic diagram of the structure of the first outer sealing plate.

[0038] Fig.16 yes Fig.15 Schematic diagram of the structure of the second outer sealing plate.

[0039] Fig.17 yes Figure 1 Schematic diagram of the structure of the processing tooling.

[0040] Fig.18 yes Fig.17 Top view of the .

[0041] Fig.19 yes Figure 1 Schematic diagram of the structure of the middle and rear guide vanes.

[0042] Fig. 20 yes Fig.19 Schematic diagram of the structure of the middle U-shaped horse plate.

[0043] In the figure: hub body 1, front flange plate 11, hub body rib plate 12, hub shaft 13, rear flange plate 14, hub body weld 15, shell assembly 2, inner liner plate 21, inner liner ring 22, first vertical tolerance 23, second vertical tolerance 24, third vertical tolerance 25, first weld 26, second weld 261, third weld 262, fourth weld 263, fifth weld 264, sixth weld 265, assembly platform 3, first longitudinal rib plate 4, second longitudinal rib plate 41, third longitudinal rib plate 42, first transverse annular rib 5, second transverse annular rib 51, first outer sealing plate 6, second outer sealing plate 61, processing tool 7, guide vane mounting groove 71, U-shaped horse plate 72, latch 73, rib plate 74, rear guide vane 8, process block 81, annular support 9, first annular support 91, second annular support 92, third annular support 93, annular positioning weld 94. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0045] See also Figure 1 — Fig. 20 A method for manufacturing a rear conduit, the rear conduit comprising a hub body 1 and a shell assembly 2, the method comprising the following steps: The first step: assembling the hub body 1: first assemble the front flange plate 11, the hub body rib plate 12 and the hub shaft 13, then perform tack welding on the connection between the front flange plate 11, the hub body rib plate 12 and the hub shaft 13 to fix the front flange plate 11, the hub body rib plate 12 and the hub shaft 13, then assemble the rear flange plate 14 and the hub body rib plate 12, then perform tack welding on the connection between the rear flange plate 14 and the hub body rib plate 12 to fix the rear flange plate 14 and the hub body rib plate 12; Step 2: welding the hub body 1: first, the welds between the hub body rib plate 12 and the front flange plate 11 are welded in sequence, and then the welds between the hub body rib plate 12 and the rear flange plate 14 are welded in sequence, and then the hub body 1 is obtained; Step 3: Assemble the main body of the shell assembly 2: first place the inner lining plate 21 on the assembly platform 3, then place the inner lining ring 22 on the top of the inner lining plate 21, then perform tack welding on the connection between the inner lining ring 22 and the inner lining plate 21 to fix the inner lining ring 22 and the inner lining plate 21, then place multiple first longitudinal ribs 4 on the inner lining plate 21 in sequence, so that one side of the first longitudinal rib 4 is connected to the outer surface of the inner lining ring 22, and then perform tack welding on the connection between the first longitudinal rib 4 and the inner lining plate 21 to fix the first longitudinal rib 4 and the inner lining plate 21, and then the first transverse ring rib 5 is dropped along the outer surface of the inner lining ring 22 to the top of the first longitudinal rib plate 4, and then a plurality of second longitudinal rib plates 41 are sequentially placed on the first transverse ring rib 5, and then the second transverse ring rib 51 is dropped along the outer surface of the inner lining ring 22 to the top of the second longitudinal rib plate 41, and then a plurality of third longitudinal rib plates 42 are sequentially placed on the second transverse ring rib 51, and then the connection of the first transverse ring rib 5, the second longitudinal rib plate 41, the second transverse ring rib 51, and the third longitudinal rib plate 42 is tack welded; Step 4: Welding the main body of the shell component 2: First, weld the welds between the inner lining ring 22, the inner lining plate 21, the first longitudinal rib plate 4, the first transverse annular rib 5, the second longitudinal rib plate 41, the second transverse annular rib 51, and the third longitudinal rib plate 42 in the specified order, and then obtain the main body of the shell component 2; Step 5: Assemble the outer seal of the housing assembly 2: first assemble the inner surface of the first outer seal plate 6 with the outer surface of the second longitudinal rib plate 41, and then assemble the inner surface of the second outer seal plate 61 with the outer surface of the third longitudinal rib plate 42; Step 6: Perform outer sealing welding of the housing assembly 2: first, weld the weld between the first outer sealing plate 6 and the second longitudinal rib plate 41 in sequence, then weld the weld between the second outer sealing plate 61 and the third longitudinal rib plate 42 in sequence, and then obtain the housing assembly 2; Step 7: Assemble the rear duct: first place the processing tool 7 on the assembly platform 3, then place the hub body 1 in the inner hole of the processing tool 7, then cover the outer shell assembly 2 on the outside of the processing tool 7, then assemble the rear guide vane 8 with the processing tool 7, and then perform positioning welding on the connection between the rear guide vane 8 and the hub body 1 and the outer shell assembly 2; Step 8: Perform rear duct welding: weld the connection between the rear guide vane 8 and the hub body 1 and the housing assembly 2 in a specified order to obtain the rear duct.

[0046] In the seventh step, the rear guide vane 8 and the processing tooling 7 are assembled by first placing the rear guide vane 8 in the guide vane mounting groove 71 of the processing tooling 7, and then using the U-shaped horse plate 72 to press all the rear guide vanes 8 in sequence, and then using the pin 73 to insert the U-shaped horse plate 72 and the process block 81 of the rear guide vane 8 to fix the U-shaped horse plate 72 and the process block 81.

[0047] In the seventh step, the processing tool 7 is placed on the assembly platform 3 to first make the flatness of the bottom plate of the processing tool 7 meet the requirements, and then place the processing tool 7 on the assembly platform 3; In the seventh step, the outer shell component 2 is put on the outside of the processing tool 7 by first putting the outer shell component 2 on the outside of the processing tool 7, and then positioning the inner hole of the outer shell component 2 and the multiple ribs 74 on the outside of the processing tool 7, and then making the concentricity of the inner hole of the outer shell component 2 and the aforementioned ribs 74 meet the requirements, thereby ensuring that the concentricity of the outer shell component 2 and the hub body 1 meets the requirements.

[0048] In the eighth step, the welding of the connection between the rear guide vane 8 and the hub body 1 and the shell assembly 2 in the specified order is to first randomly select a weld at the connection between the rear guide vane 8 and the hub body 1 and the shell assembly 2 for welding, and then randomly select a weld at the connection between the rear guide vane 8 and the hub body 1 and the shell assembly 2 for welding, and then randomly select a weld at the connection between the rear guide vane 8 and the hub body 1 and the shell assembly 2 for welding, and then select a weld at the connection between the rear guide vane 8 and the hub body 1 and the shell assembly 2 for welding, and repeat the above process until all the welds at the connection between the rear guide vane 8 and the hub body 1 and the shell assembly 2 are completed.

[0049] In the third step, placing the inner lining ring 22 on the top of the inner lining plate 21 is placing the inner lining ring 22 on the top of the inner lining plate 21, and the height from the bottom of the inner lining plate 21 to the top of the inner lining ring 22 is a first vertical tolerance 23, and the first vertical tolerance 23 is less than or equal to one millimeter; In the third step, the plurality of first longitudinal ribs 4 are sequentially placed on the inner lining plate 21 by first drawing machining lines of the plurality of first longitudinal ribs 4, and then sequentially placing the plurality of first longitudinal ribs 4 on the inner lining plate 21 according to the machining lines, wherein the deviation between all the first longitudinal ribs 4 and the machining lines is less than or equal to 0.5 mm; In the third step, the first transverse annular rib 5 is made to fall along the outer surface of the inner lining ring 22 to the top of the first longitudinal rib plate 4, and the bottom of the first transverse annular rib 5 to the top of the inner lining plate 21 is the second vertical tolerance 24, and the second vertical tolerance 24 is less than or equal to one millimeter.

[0050] In the third step, the second longitudinal ribs 41 are sequentially placed on the first transverse annular ribs 5 by first drawing machining lines of the second longitudinal ribs 41, and then sequentially placing the second longitudinal ribs 41 on the first transverse annular ribs 5, wherein the deviation between all the second longitudinal ribs 41 and the machining lines is less than or equal to 0.5 mm. In the third step, the second transverse annular rib 51 is made to fall along the outer surface of the inner lining ring 22 to the top of the second longitudinal rib plate 41, and the distance from the bottom of the second transverse annular rib 51 to the top of the first transverse annular rib 5 is a third vertical tolerance 25, and the third vertical tolerance 25 is less than or equal to one millimeter. In the third step, the plurality of third longitudinal ribs 42 are sequentially placed on the second transverse annular rib 51 by first drawing machining lines of the plurality of third longitudinal ribs 42, and then sequentially placing the plurality of third longitudinal ribs 42 on the second transverse annular rib 51, wherein the deviation between the third longitudinal ribs 42 and the machining lines is less than or equal to 0.5 mm.

[0051] In the fourth step, the welds between the inner lining ring 22, the inner lining plate 21, the first longitudinal rib plate 4, the first transverse ring rib 5, the second longitudinal rib plate 41, the second transverse ring rib 51, and the third longitudinal rib plate 42 are welded in sequence in the specified order: first, the first weld 26 between the inner lining ring 22 and the inner lining plate 21 is welded, and then the second weld 261 between the first longitudinal rib plate 4 and the inner lining plate 21, the first transverse ring rib 5, and the inner lining ring 22 is welded, and then the third weld 262 between the inner lining ring 22 and the first transverse ring rib 5 is welded, and then the fourth weld 263 between the second longitudinal rib plate 41 and the first transverse ring rib 5, the second transverse ring rib 51, and the inner lining ring 22 is welded, and then the fifth weld 264 between the inner lining ring 22 and the second transverse ring rib 51 is welded, and then the sixth weld 265 between the third longitudinal rib plate 42 and the second transverse ring rib 51 and the inner lining ring 22 is welded.

[0052] In the third step, the plurality of first longitudinal ribs 4 are sequentially placed on the inner lining plate 21 by first fixing the annular support 9 inside the inner hole of the inner lining ring 22, and then sequentially placing the plurality of first longitudinal ribs 4 on the inner lining plate 21; In the fourth step, the main body of the outer shell component 2 is obtained by first removing the annular support 9 and then obtaining the main body of the outer shell component 2.

[0053] In the first step, the front flange plate 11, the hub body rib plate 12 and the hub shaft 13 are assembled by first drawing an assembly line of the hub body rib plate 12 on the front flange plate 11, and then assembling the front flange plate 11, the hub body rib plate 12 and the hub shaft 13; In the first step, the rear flange plate 14 and the hub body rib plate 12 are assembled by first drawing an assembly line of the hub body rib plate 12 on the rear flange plate 14 , and then assembling the rear flange plate 14 and the hub body rib plate 12 .

[0054] In the fourth step, the main body of the shell component 2 is obtained by first obtaining the main body of the shell component 2 and then performing stress annealing on the main body of the shell component 2; In the eighth step, the rear conduit is obtained by first obtaining the rear conduit and then performing stress annealing on the rear conduit.

[0055] The supplementary description of the present invention is as follows: The welding described in the present invention refers to: using manual tungsten inert gas arc welding to weld parts, the current is 140 to 160 amps, and the welding material is GTS-316L, ф2 mm.

[0056] Embodiment 1: See also Figure 1 — Fig. 20 A method for manufacturing a rear conduit, the rear conduit comprising a hub body 1 and a shell assembly 2, the method comprising the following steps: The first step: assembling the hub body 1: first assemble the front flange plate 11, the hub body rib plate 12 and the hub shaft 13, then perform tack welding on the connection between the front flange plate 11, the hub body rib plate 12 and the hub shaft 13 to fix the front flange plate 11, the hub body rib plate 12 and the hub shaft 13, then assemble the rear flange plate 14 and the hub body rib plate 12, then perform tack welding on the connection between the rear flange plate 14 and the hub body rib plate 12 to fix the rear flange plate 14 and the hub body rib plate 12; Step 2: welding the hub body 1: first, the welds between the hub body rib plate 12 and the front flange plate 11 are welded in sequence, and then the welds between the hub body rib plate 12 and the rear flange plate 14 are welded in sequence, and then the hub body 1 is obtained; Step 3: Assemble the main body of the shell assembly 2: first place the inner lining plate 21 on the assembly platform 3, then place the inner lining ring 22 on the top of the inner lining plate 21, then perform tack welding on the connection between the inner lining ring 22 and the inner lining plate 21 to fix the inner lining ring 22 and the inner lining plate 21, then place multiple first longitudinal ribs 4 on the inner lining plate 21 in sequence, so that one side of the first longitudinal rib 4 is connected to the outer surface of the inner lining ring 22, and then perform tack welding on the connection between the first longitudinal rib 4 and the inner lining plate 21 to fix the first longitudinal rib 4 and the inner lining plate 21, and then the first transverse ring rib 5 is dropped along the outer surface of the inner lining ring 22 to the top of the first longitudinal rib plate 4, and then a plurality of second longitudinal rib plates 41 are sequentially placed on the first transverse ring rib 5, and then the second transverse ring rib 51 is dropped along the outer surface of the inner lining ring 22 to the top of the second longitudinal rib plate 41, and then a plurality of third longitudinal rib plates 42 are sequentially placed on the second transverse ring rib 51, and then the connection of the first transverse ring rib 5, the second longitudinal rib plate 41, the second transverse ring rib 51, and the third longitudinal rib plate 42 is tack welded; Step 4: Welding the main body of the shell component 2: First, weld the welds between the inner lining ring 22, the inner lining plate 21, the first longitudinal rib plate 4, the first transverse annular rib 5, the second longitudinal rib plate 41, the second transverse annular rib 51, and the third longitudinal rib plate 42 in the specified order, and then obtain the main body of the shell component 2; Step 5: Assemble the outer seal of the housing assembly 2: first assemble the inner surface of the first outer seal plate 6 with the outer surface of the second longitudinal rib plate 41, and then assemble the inner surface of the second outer seal plate 61 with the outer surface of the third longitudinal rib plate 42; Step 6: Perform outer sealing welding of the housing assembly 2: first, weld the weld between the first outer sealing plate 6 and the second longitudinal rib plate 41 in sequence, then weld the weld between the second outer sealing plate 61 and the third longitudinal rib plate 42 in sequence, and then obtain the housing assembly 2; Step 7: Assemble the rear duct: first place the processing tool 7 on the assembly platform 3, then place the hub body 1 in the inner hole of the processing tool 7, then cover the outer shell assembly 2 on the outside of the processing tool 7, then assemble the rear guide vane 8 with the processing tool 7, and then perform positioning welding on the connection between the rear guide vane 8 and the hub body 1 and the outer shell assembly 2; Step 8: Perform rear duct welding: weld the connection between the rear guide vane 8 and the hub body 1 and the shell assembly 2 in a specified order to obtain the rear duct.

[0057] Embodiment 2: The basic content is the same as that of Example 1, except that: See also Figure 1 — Fig. 20 In the seventh step, the rear guide vane 8 and the processing tool 7 are assembled by first placing the rear guide vane 8 in the guide vane installation groove 71 of the processing tool 7, then using the U-shaped horse plate 72 to press all the rear guide vanes 8 in sequence, and then using the latch 73 to insert the U-shaped horse plate 72 and the process block 81 of the rear guide vane 8 to fix the U-shaped horse plate 72 and the process block 81. In the seventh step, the processing tool 7 is placed on the assembly platform 3 to first make the flatness of the bottom plate of the processing tool 7 meet the requirements, and then place the processing tool 7 on the assembly platform 3; in the seventh step, the shell component 2 is firstly put on the outside of the processing tool 7, and then the inner hole of the shell component 2 is positioned with the multiple ribs 74 on the outside of the processing tool 7, and then the concentricity of the inner hole of the shell component 2 and the aforementioned ribs 74 meets the requirements, so as to ensure that the concentricity of the shell component 2 and the hub body 1 meets the requirements.

[0058] When applied, in the seventh step, the bottom plate of the processing tool 7 is first processed to make its flatness meet the requirements, and then the processing tool 7 is placed on the assembly platform 3, and then the boss of the hub body 1 is placed in the inner hole of the processing tool 7, and then the inner hole of the shell component 2 is sleeved on the outside of the processing tool 7, and then the inner hole of the shell component 2 and the multiple ribs 74 on the outside of the processing tool 7 are positioned, and then the concentricity of the shell component 2 and the aforementioned ribs 74 is made to meet the requirements by machining, and then the rear guide vane 8 is placed in the guide vane mounting groove 71, and the guide vane mounting groove 71 is processed to ensure its relative position, and then the U-shaped horse plate 72 is used to press all the rear guide vanes 8 in turn, and then the pin 73 is inserted into the U-shaped horse plate 72 and the process block 81 of the rear guide vane 8 to fix the U-shaped horse plate 72 and the process block 81.

[0059] Embodiment 3: The basic content is the same as that of Example 1, except that: See also Figure 1 — Fig. 20 In the eighth step, the welding of the connection between the rear guide vane 8 and the hub body 1 and the shell assembly 2 in the specified order is to first select a weld at the connection between the rear guide vane 8 and the hub body 1 and the shell assembly 2 at random, then select a weld at the connection between the rear guide vane 8 and the hub body 1 and the shell assembly 2 symmetrical to the aforementioned rear guide vane 8 for welding, then select a weld at the connection between the rear guide vane 8 and the hub body 1 and the shell assembly 2 at random, then select a weld at the connection between the rear guide vane 8 and the hub body 1 and the shell assembly 2 symmetrical to the aforementioned rear guide vane 8 for welding, and repeat the above process until all the welds at the connection between the rear guide vane 8 and the hub body 1 and the shell assembly 2 are welded. Preferably, in the eighth step, the gas flow rate of the welding is fifteen to twenty liters per minute, and the welding speed is eighteen to twenty centimeters per minute.

[0060] When applied, in the eighth step, first arbitrarily select a weld of a rear guide vane 8 for welding, and then select a weld of a rear guide vane 8 symmetrical to the rear guide vane 8 for welding, that is, all welds on a rear guide vane 8 will not be welded at one time, so as to ensure that excessive temperature will not be generated during welding, which will cause the welding quality of the rear guide vane 8 to deteriorate.

[0061] Embodiment 4: The basic content is the same as that of Example 1, except that: See also Figure 1 — Fig.14In the third step, placing the inner lining ring 22 on the top of the inner lining plate 21 is to place the inner lining ring 22 on the top of the inner lining plate 21, and the height from the bottom of the inner lining plate 21 to the top of the inner lining ring 22 is the first vertical tolerance 23, and the first vertical tolerance 23 is less than or equal to one millimeter; in the third step, placing the plurality of first longitudinal ribs 4 on the inner lining plate 21 in sequence is to first draw the machining lines of the plurality of first longitudinal ribs 4, and then place the plurality of first longitudinal ribs 4 according to the machining lines. The lines are placed on the inner lining plate 21 in sequence, and the deviations between all the first longitudinal ribs 4 and the machined scale lines are less than or equal to 0.5 mm; in the third step, the first transverse annular rib 5 is made to fall along the outer surface of the inner lining ring 22 to the top of the first longitudinal rib 4, and the bottom of the first transverse annular rib 5 to the top of the inner lining plate 21 is the second vertical tolerance 24, and the second vertical tolerance 24 is less than or equal to one millimeter. In the third step, placing the plurality of second longitudinal ribs 41 on the first transverse ring rib 5 in sequence is to first draw the machining lines of the plurality of second longitudinal ribs 41, and then placing the plurality of second longitudinal ribs 41 on the first transverse ring rib 5 in sequence, and the deviation of all the second longitudinal ribs 41 from the machining lines is less than or equal to 0.5 mm; in the third step, making the second transverse ring rib 51 fall along the outer surface of the inner lining ring 22 to the top of the second longitudinal rib 41 is to make the second transverse ring rib 51 fall along the outer surface of the inner lining ring 22 to the first transverse ring rib 51. The top of the second longitudinal rib plate 41, the bottom of the second transverse ring rib 51 to the top of the first transverse ring rib 5 is a third vertical tolerance 25, and the third vertical tolerance 25 is less than or equal to one millimeter; in the third step, the plurality of third longitudinal rib plates 42 are placed on the second transverse ring rib 51 in sequence by first drawing the machining lines of a plurality of third longitudinal rib plates 42, and then placing the plurality of third longitudinal rib plates 42 on the second transverse ring rib 51 in sequence, and the deviation between the third longitudinal rib plates 42 and the machining lines is less than or equal to 0.5 millimeters. In the fourth step, the welds between the inner lining ring 22, the inner lining plate 21, the first longitudinal rib plate 4, the first transverse ring rib 5, the second longitudinal rib plate 41, the second transverse ring rib 51, and the third longitudinal rib plate 42 are welded in sequence in the specified order: first, the first weld 26 between the inner lining ring 22 and the inner lining plate 21 is welded, and then the second weld 261 between the first longitudinal rib plate 4 and the inner lining plate 21, the first transverse ring rib 5, and the inner lining ring 22 is welded, and then the third weld 262 between the inner lining ring 22 and the first transverse ring rib 5 is welded, and then the fourth weld 263 between the second longitudinal rib plate 41 and the first transverse ring rib 5, the second transverse ring rib 51, and the inner lining ring 22 is welded, and then the fifth weld 264 between the inner lining ring 22 and the second transverse ring rib 51 is welded, and then the sixth weld 265 between the third longitudinal rib plate 42 and the second transverse ring rib 51 and the inner lining ring 22 is welded. Preferably, in the fourth step, the welding gas flow rate is fifteen to twenty liters per minute, and the welding speed is eighteen to twenty centimeters per minute.

[0062] When applied, in the third step, first place the inner lining plate 21 on the assembly platform 3, then connect the inner lining ring 22 to the inner lining plate 21, so that the first vertical tolerance 23 is less than or equal to one millimeter, and then perform positioning welding on the connection between the inner lining ring 22 and the inner lining plate 21; then draw a plurality of machining lines of the first longitudinal ribs 4, and then place a plurality of first longitudinal ribs 4 on the inner lining plate 21 in sequence according to the machining lines, so that the deviations of all first longitudinal ribs 4 from the machining lines are less than or equal to 0.5 millimeters, and then perform positioning welding on the connection between the first longitudinal ribs 4 and the inner lining plate 21, the positioning welding length is six to eight millimeters, and the positioning welding height is three to four millimeters; then make the first transverse annular rib 5 fall onto the first longitudinal rib plate 4, so that the second vertical tolerance 24 is less than or equal to one millimeter; then draw a plurality of machining lines of the second longitudinal ribs 41, and then place a plurality of second longitudinal ribs 41 on the first transverse annular rib 5 in sequence, so that all Some second longitudinal ribs 41 have a deviation from the machining scale line that is less than or equal to 0.5 mm; then the second transverse ring rib 51 is dropped to the top of the second longitudinal rib 41, so that the third vertical tolerance 25 is less than or equal to one millimeter; then a plurality of machining scale lines of the third longitudinal ribs 42 are drawn, and then a plurality of third longitudinal ribs 42 are placed on the second transverse ring rib 51 in sequence, so that the deviation from the machining scale line of the third longitudinal rib 42 is less than or equal to 0.5 mm; then the first transverse ring rib 5, the second longitudinal rib 41, the second transverse ring rib 51, and the third longitudinal rib 42 are tack welded at the connection; in the fourth step, the first weld 26 is welded first, then the second weld 261 is welded, then the third weld 262 is welded, then the fourth weld 263 is welded, then the fifth weld 264 is welded, and then the sixth weld 265 is welded to keep the welding temperature from being too high.

[0063] Embodiment 5: The basic content is the same as that of Example 1, except that: See also Figure 1 — Fig.16 In the third step, the placing of the plurality of first longitudinal ribs 4 on the inner lining plate 21 in sequence is to first fix the annular support 9 inside the inner hole of the inner lining ring 22, and then place the plurality of first longitudinal ribs 4 on the inner lining plate 21 in sequence; in the fourth step, the obtaining of the main body of the outer shell component 2 is to first remove the annular support 9, and then obtain the main body of the outer shell component 2. Preferably, the annular support 9 includes a first annular support 91, a second annular support 92 and a third annular support 93.

[0064] When applied, in the third step, after completing the positioning welding of the connection between the inner lining ring 22 and the inner lining plate 21, the third annular support 93 is placed in the bottom of the inner lining ring 22, and then the second annular support 92 is placed in the middle of the inner lining ring 22, and then the third annular support 93 is placed in the top of the inner lining ring 22, and then multiple annular positioning welding points 94 are positioned welded, the positioning welding length is three to five millimeters, the weld length is fifteen to thirty millimeters, and there are eight circumferential spot weldings; then multiple first longitudinal ribs 4 are placed on the inner lining plate 21 in sequence; in the fourth step, after the welding is completed, the third annular support 93 is first removed, and then the second annular support 92 is removed, and then the third annular support 93 is removed, and then the main body of the outer shell component 2 is obtained; the first annular support 91, the second annular support 92 and the third annular support 93 are used to maintain the roundness of the inner lining ring 22 so that the inner lining ring 22 does not deform during processing.

[0065] Embodiment 6: The basic content is the same as that of Example 1, except that: See also Figure 1 — Figure 5 In the first step, the assembly of the front flange plate 11, the hub body rib plate 12 and the hub shaft 13 is to first draw the assembly line of the hub body rib plate 12 on the front flange plate 11, and then assemble the front flange plate 11, the hub body rib plate 12 and the hub shaft 13; in the first step, the assembly of the rear flange plate 14 and the hub body rib plate 12 is to first draw the assembly line of the hub body rib plate 12 on the rear flange plate 14, and then assemble the rear flange plate 14 and the hub body rib plate 12. Preferably, in the second step, the gas flow rate during welding is 15 to 20 cm per minute, and the welding speed is 18 to 20 cm per minute.

[0066] When applied, in the first step, first draw the assembly line of the hub body rib 12 on the front flange plate 11, and then assemble the front flange plate 11, the hub body rib 12 and the hub shaft 13, the height tolerance of the front flange plate 11, the hub body rib 12 and the hub shaft 13 is less than or equal to one millimeter, and then the connection between the front flange plate 11, the hub body rib 12 and the hub shaft 13 is tack welded; then draw the assembly line of the hub body rib 12, and then assemble the rear flange plate 14 and the hub body rib 12, the height tolerance of the rear flange plate 14 and the hub body rib 12 is less than or equal to one millimeter, and then the rear flange plate 14 and the hub body rib 12 are tack welded.

[0067] Embodiment 7: The basic content is the same as that of Example 1, except that: See also Figure 1 — Fig. 20 In the fourth step, the main body of the shell component 2 is obtained by first obtaining the main body of the shell component 2 and then performing stress annealing on the main body of the shell component 2; in the eighth step, the rear conduit is obtained by first obtaining the rear conduit and then performing stress annealing on the rear conduit.

[0068] When applied, in the fourth step, the main body of the shell component 2 is obtained, and then the main body of the shell component 2 is stress annealed; in the eighth step, the rear conduit is obtained, and then the rear conduit is stress annealed, and then the rear conduit is removed from the processing tooling 7, and then other processing is performed on the rear conduit as required; stress annealing improves the strength, toughness and plasticity of the rear conduit, so that the rear conduit can better resist external forces.

[0069] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A method for manufacturing a rear conduit, the rear conduit comprising a hub body (1) and a shell assembly (2), characterized in that: The method comprises the following steps: The first step is to assemble the hub body (1): first assemble the front flange plate (11), the hub body rib plate (12) and the hub shaft (13), then perform tack welding on the connection between the front flange plate (11), the hub body rib plate (12) and the hub shaft (13) to fix the front flange plate (11), the hub body rib plate (12) and the hub shaft (13), then assemble the rear flange plate (14) and the hub body rib plate (12), then perform tack welding on the connection between the rear flange plate (14) and the hub body rib plate (12) to fix the rear flange plate (14) and the hub body rib plate (12); Step 2: welding the hub body (1): first, welding the welds between the hub body rib plate (12) and the front flange plate (11) in sequence, then welding the welds between the hub body rib plate (12) and the rear flange plate (14) in sequence, and then obtaining the hub body (1); Step 3: Assemble the main body of the shell assembly (2): first place the inner lining plate (21) on the assembly platform (3), then place the inner lining ring (22) on the top of the inner lining plate (21), then perform tack welding on the connection between the inner lining ring (22) and the inner lining plate (21) to fix the inner lining ring (22) and the inner lining plate (21), then place a plurality of first longitudinal rib plates (4) on the inner lining plate (21) in sequence, so that one side of the first longitudinal rib plate (4) is connected to the outer surface of the inner lining ring (22), and then perform tack welding on the connection between the first longitudinal rib plate (4) and the inner lining plate (21) to fix the first longitudinal rib plate (4). ) and the inner lining plate (21), then the first transverse ring rib (5) is dropped along the outer surface of the inner lining ring (22) to the top of the first longitudinal rib plate (4), then a plurality of second longitudinal rib plates (41) are sequentially placed on the first transverse ring rib (5), then the second transverse ring rib (51) is dropped along the outer surface of the inner lining ring (22) to the top of the second longitudinal rib plate (41), then a plurality of third longitudinal rib plates (42) are sequentially placed on the second transverse ring rib (51), and then the connection points of the first transverse ring rib (5), the second longitudinal rib plate (41), the second transverse ring rib (51), and the third longitudinal rib plate (42) are tack welded; Step 4: welding the main body of the outer shell component (2): first, welding the weld seams between the inner lining ring (22), the inner lining plate (21), the first longitudinal rib plate (4), the first transverse annular rib (5), the second longitudinal rib plate (41), the second transverse annular rib (51), and the third longitudinal rib plate (42) in a specified order, and then obtaining the main body of the outer shell component (2); Step 5: assembling the outer seal of the housing assembly (2): first assembling the inner surface of the first outer seal plate (6) with the outer surface of the second longitudinal rib plate (41), and then assembling the inner surface of the second outer seal plate (61) with the outer surface of the third longitudinal rib plate (42); Step 6: welding the outer seal of the housing component (2): firstly welding the weld between the first outer seal plate (6) and the second longitudinal rib plate (41) in sequence, then welding the weld between the second outer seal plate (61) and the third longitudinal rib plate (42) in sequence, and then obtaining the housing component (2); Step 7: assembling the rear guide vane: first, placing the processing tool (7) on the assembly platform (3), then placing the hub body (1) in the inner hole of the processing tool (7), then sleeve the outer shell component (2) on the outside of the processing tool (7), then assembling the rear guide vane (8) and the processing tool (7), and then performing positioning welding on the connection between the rear guide vane (8) and the hub body (1) and the outer shell component (2); Step 8: welding the rear duct: welding the connection between the rear guide vane (8) and the hub body (1) and the housing assembly (2) in a specified order, and then obtaining the rear duct.

2. The method for manufacturing a rear duct according to claim 1, characterized in that: In the seventh step, the rear guide vane (8) and the processing tool (7) are assembled by first placing the rear guide vane (8) in the guide vane installation groove (71) of the processing tool (7), then using the U-shaped horse plate (72) to press all the rear guide vanes (8) in sequence, and then using the latch (73) to insert the U-shaped horse plate (72) and the process block 81 of the rear guide vane (8) to fix the U-shaped horse plate (72) and the process block (81).

3. The method for manufacturing a rear duct according to claim 2, characterized in that: In the seventh step, the processing tool (7) is placed on the assembly platform (3) by first making the flatness of the bottom plate of the processing tool (7) meet the requirements, and then placing the processing tool (7) on the assembly platform (3); In the seventh step, the outer shell component (2) is put on the outside of the processing tool (7) by first putting the outer shell component (2) on the outside of the processing tool (7), then positioning the inner hole of the outer shell component (2) and a plurality of ribs (74) on the outside of the processing tool (7), and then making the concentricity of the inner hole of the outer shell component (2) and the aforementioned ribs (74) meet the requirements, thereby ensuring that the concentricity of the outer shell component (2) and the hub body (1) meets the requirements.

4. The method for manufacturing a rear duct according to claim 1, characterized in that: In the eighth step, the welding of the connection between the rear guide vane (8) and the hub body (1) and the shell assembly (2) in the specified order is firstly selecting a weld at the connection between the rear guide vane (8) and the hub body (1) and the shell assembly (2) at random for welding, then selecting a weld at the connection between a rear guide vane (8) and the hub body (1) and the shell assembly (2) symmetrical to the aforementioned rear guide vane (8) for welding, then selecting a weld at the connection between the rear guide vane (8) and the hub body (1) and the shell assembly (2) at random for welding, then selecting a weld at the connection between the rear guide vane (8) and the hub body (1) and the shell assembly (2) at random for welding, and then selecting a weld at the connection between the rear guide vane (8) and the hub body (1) and the shell assembly (2) symmetrical to the aforementioned rear guide vane (8) for welding, and repeating the above process until all the welds at the connection between the rear guide vane (8) and the hub body (1) and the shell assembly (2) are completed.

5. The method for manufacturing a rear duct according to claim 1, characterized in that: In the third step, placing the inner lining ring (22) on the top of the inner lining plate (21) means placing the inner lining ring (22) on the top of the inner lining plate (21), and the height from the bottom of the inner lining plate (21) to the top of the inner lining ring (22) is a first vertical tolerance (23), and the first vertical tolerance (23) is less than or equal to one millimeter; In the third step, the step of sequentially placing the plurality of first longitudinal rib plates (4) on the inner lining plate (21) comprises first drawing machining lines of the plurality of first longitudinal rib plates (4), and then sequentially placing the plurality of first longitudinal rib plates (4) on the inner lining plate (21) according to the machining lines, wherein the deviation between all the first longitudinal rib plates (4) and the machining lines is less than or equal to 0.5 millimeters; In the third step, the first transverse annular rib (5) is made to fall along the outer surface of the inner lining ring (22) to the top of the first longitudinal rib plate (4) by making the first transverse annular rib (5) fall along the outer surface of the inner lining ring (22) to the top of the first longitudinal rib plate (4), and the distance from the bottom of the first transverse annular rib (5) to the top of the inner lining plate (21) is the second vertical tolerance (24), and the second vertical tolerance (24) is less than or equal to one millimeter.

6. The method for manufacturing a rear duct according to claim 5, characterized in that: In the third step, the step of sequentially placing the plurality of second longitudinal ribs (41) on the first transverse annular rib (5) comprises first drawing machining lines of the plurality of second longitudinal ribs (41), and then sequentially placing the plurality of second longitudinal ribs (41) on the first transverse annular rib (5), wherein the deviation between all the second longitudinal ribs (41) and the machining lines is less than or equal to 0.5 mm; In the third step, the second transverse annular rib (51) is made to fall along the outer surface of the inner lining ring (22) to the top of the second longitudinal rib plate (41) by making the second transverse annular rib (51) fall along the outer surface of the inner lining ring (22) to the top of the second longitudinal rib plate (41), and the distance from the bottom of the second transverse annular rib (51) to the top of the first transverse annular rib (5) is a third vertical tolerance (25), and the third vertical tolerance (25) is less than or equal to one millimeter; In the third step, the method of placing the plurality of third longitudinal ribs (42) on the second transverse annular rib (51) in sequence is to first draw machining lines of the plurality of third longitudinal ribs (42), and then place the plurality of third longitudinal ribs (42) on the second transverse annular rib (51) in sequence, wherein the deviation between the third longitudinal ribs (42) and the machining lines is less than or equal to 0.5 mm.

7. The method for manufacturing a rear duct according to claim 6, characterized in that: In the fourth step, the welds between the inner lining ring (22), the inner lining plate (21), the first longitudinal rib plate (4), the first transverse annular rib (5), the second longitudinal rib plate (41), the second transverse annular rib (51), and the third longitudinal rib plate (42) are welded in sequence in a specified order, namely, the first weld (26) between the inner lining ring (22) and the inner lining plate (21) is welded first, and then the second weld (261) between the first longitudinal rib plate (4) and the inner lining plate (21), the first transverse annular rib (5), and the inner lining ring (22) is welded. , then the third weld (262) between the inner lining ring (22) and the first transverse ring rib (5) is welded, then the fourth weld (263) between the second longitudinal rib plate (41) and the first transverse ring rib 5, the second transverse ring rib (51), and the inner lining ring (22) is welded, then the fifth weld (264) between the inner lining ring (22) and the second transverse ring rib (51) is welded, and then the sixth weld (265) between the third longitudinal rib plate (42) and the second transverse ring rib (51), and the inner lining ring (22) is welded.

8. The method for manufacturing a rear duct according to claim 1, characterized in that: In the third step, the plurality of first longitudinal ribs (4) are sequentially placed on the inner lining plate (21) by first fixing the annular support (9) inside the inner hole of the inner lining ring (22), and then sequentially placing the plurality of first longitudinal ribs (4) on the inner lining plate (21); In the fourth step, the main body of the outer shell component (2) is obtained by first removing the annular support (9) and then obtaining the main body of the outer shell component (2).

9. The method for manufacturing a rear duct according to claim 1, characterized in that: In the first step, the front flange plate (11), the hub body rib plate (12) and the hub shaft (13) are assembled by first drawing an assembly line of the hub body rib plate (12) on the front flange plate (11), and then assembling the front flange plate (11), the hub body rib plate (12) and the hub shaft (13); In the first step, the rear flange plate (14) and the hub body rib plate (12) are assembled by first drawing an assembly line of the hub body rib plate (12) on the rear flange plate (14), and then assembling the rear flange plate (14) and the hub body rib plate (12).

10. The method for manufacturing a rear duct according to claim 1, characterized in that: In the fourth step, obtaining the main body of the shell component (2) comprises first obtaining the main body of the shell component (2), and then performing stress annealing on the main body of the shell component (2); In the eighth step, the rear conduit is obtained by first obtaining the rear conduit and then performing stress annealing on the rear conduit.

Images