Method for manufacturing a rear catheter

Abstract

A method for manufacturing a rear duct includes assembling a hub body and a shell assembly, first assembling the hub body, then welding the hub body, then assembling the shell assembly body, then welding the shell assembly body, then assembling the shell assembly outer seal, then welding the shell assembly outer seal, then placing the hub body inside a processing tool, then sleeve the shell assembly outside the processing tool, then securing the rear guide vanes to the processing tool, and then welding; securing the rear guide vanes with the processing tool eliminates the need to secure them with bolts in the narrow space around the processing tool, thereby reducing assembly difficulty, and eliminating the need to remove bolts after welding, thereby improving production efficiency. Therefore, this design has low assembly difficulty and high production efficiency.

Description

Technical Field

[0001] The present 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 set 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 the production of the rear duct is somewhat difficult.

[0003] The Chinese patent application number is 202210581310.1, and the application date is May 26, 2022. It discloses a lightweight composite structure duct and its manufacturing method, including a mounting bracket located in a central position, wherein the outer circumferential surface of the mounting bracket is evenly distributed with a plurality of support bars, and a stepped hole is provided inside the mounting bracket. It also includes an inner skin, and one end of the inner skin is provided with evenly distributed slots in the circumferential direction, each slot 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 around 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 produce a rear duct, it still has the following defects:

[0004] In this design, the mounting bracket and the inner skin are first placed opposite 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.

[0005] The information disclosed in this background technology section is only intended to increase understanding of the overall background of the application and should not be considered as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the Invention

[0006] 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.

[0007] To achieve the above objectives, the technical solution of the present invention is:

[0008] A method for manufacturing a rear conduit, the rear conduit comprising a hub body and a shell assembly, the method comprising the following steps:

[0009] Step 1: Assemble the hub body: first assemble the front flange plate, hub rib plate and hub shaft, then perform tack welding on the connection between the front flange plate, hub rib plate and hub shaft to fix the front flange plate, hub rib plate and hub shaft, then assemble the rear flange plate and hub rib plate, then perform tack welding on the connection between the rear flange plate and hub rib plate to fix the rear flange plate and hub rib plate;

[0010] Step 2: Welding the hub body: first weld the welds between the hub body ribs and the front flange plate, then weld the welds between the hub body ribs and the rear flange plate, and then obtain the hub body;

[0011] 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, and 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, and then place multiple first longitudinal ribs on the inner lining plate in sequence, so that one side of the first longitudinal rib is connected to the outer surface of the inner lining ring, and then perform tack welding on the connection between the first longitudinal rib and the inner lining plate to fix the first longitudinal rib and the inner lining plate, and 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, and then place multiple second longitudinal ribs on the first transverse ring rib in sequence, and 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, and then place multiple third longitudinal ribs on the second transverse ring rib in sequence, and then perform tack welding on the connection between the first transverse ring rib, the second longitudinal rib, the second transverse ring rib, and the third longitudinal rib;

[0012] 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;

[0013] Step 5: Assemble the outer seal of the shell 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;

[0014] Step 6: Weld the outer seal of the shell assembly: first weld the welds between the first outer seal plate and the second longitudinal rib plate, then weld the welds between the second outer seal plate and the third longitudinal rib plate, and then obtain the shell assembly;

[0015] 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 and the processing tooling, and then perform positioning welding on the connection between the rear guide vane and the hub body and shell assembly;

[0016] 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.

[0017] 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 pin to insert into 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.

[0018] In the seventh step, the processing tool is placed on the assembly platform to first ensure that the flatness of the bottom plate of the processing tool meets the requirements, and then the processing tool is placed on the assembly platform;

[0019] In the seventh step, the shell assembly is put on the outside of the processing tooling by first putting the shell assembly on the outside of the processing tooling, then positioning the inner hole of the shell assembly with multiple ribs on the outside of the processing tooling, and then making the concentricity of the inner hole of the shell assembly and the aforementioned ribs meet the requirements, thereby ensuring that the concentricity of the shell assembly and the hub body meets the requirements.

[0020] 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 arbitrarily 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 then arbitrarily 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 completed.

[0021] 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 1 millimeter;

[0022] In the third step, the plurality of first longitudinal ribs are sequentially placed on the inner lining plate by first drawing machining lines on the plurality of first longitudinal ribs, and then sequentially placing the plurality of first longitudinal ribs on the inner lining plate 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;

[0023] 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 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, 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.

[0024] In the third step, the step of sequentially placing the plurality of second longitudinal ribs on the first transverse ring rib comprises first drawing machining lines on the plurality of second longitudinal ribs, and then sequentially placing the plurality of second longitudinal ribs on the first transverse ring rib, wherein the deviation between all the second longitudinal ribs and the machining lines is less than or equal to 0.5 mm.

[0025] 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 distance from the bottom of the second transverse annular rib to the top of the first transverse annular rib is a third vertical tolerance, and the third vertical tolerance is less than or equal to 1 mm;

[0026] In the third step, the plurality of third longitudinal ribs are placed sequentially on the second transverse ring ribs by first drawing machining lines of the plurality of third longitudinal ribs, and then placing the plurality of third longitudinal ribs sequentially on the second transverse ring ribs, wherein the deviation between the third longitudinal ribs and the machining lines is less than or equal to 0.5 mm.

[0027] 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, namely, the first weld between the inner lining ring and the inner lining plate is welded first, 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.

[0028] In the third step, the plurality of first longitudinal ribs are sequentially placed on the inner lining plate by first fixing the annular support inside the inner hole of the inner lining ring, and then sequentially placing the plurality of first longitudinal ribs on the inner lining plate;

[0029] In the fourth step, the shell component body is obtained by first removing the annular support and then obtaining the shell component body.

[0030] In the first step, the front flange plate, the hub body rib plate and the hub shaft are assembled by first drawing the 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;

[0031] 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.

[0032] In the fourth step, obtaining the shell component body comprises first obtaining the shell component body and then performing stress annealing on the shell component body;

[0033] In the eighth step, the rear conduit is obtained by first obtaining the rear conduit and then performing stress annealing on the rear conduit.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. A method for manufacturing a rear duct according to the present invention comprises the following steps: a first step: assembling a hub body; a second step: welding the hub body; a third step: assembling a main body of a shell assembly; a fourth step: welding the main body of the shell assembly; a fifth step: assembling an outer seal of the shell assembly; a sixth step: welding the outer seal of the shell assembly; a seventh step: assembling the rear duct: first placing a processing tool on an assembly platform, then placing the hub body inside the processing tool, then sleeve the shell assembly onto the outside of the processing tool, then fix the rear guide vane on the processing tool, and then perform tack welding; and an eighth step: welding the rear duct. Advantages of the present invention also include:

[0036] First, assemble the hub body first, then the housing assembly. Use the machining tool to position the hub body and housing assembly, then use the machining tool to secure the rear guide vanes, and then weld them. Using the machining tool to secure the rear guide vanes eliminates the need to drill holes in a narrow space and then secure them with bolts, thus reducing assembly difficulty. After the rear guide vanes are welded to the hub body and housing assembly, there is no need to remove the bolts, thus increasing production efficiency by 30%.

[0037] 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. Therefore, 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;

[0038] Therefore, the present invention has low assembly difficulty and high production efficiency.

[0039] 2. In the seventh step of the manufacturing method for a rear duct according to the present invention, the flatness of the processing tooling is first ensured to meet the requirements, the hub body is then positioned within the processing tooling, and the outer shell assembly and the rib plate of the processing tooling are then positioned so that the outer shell assembly and the hub body meet the concentricity requirements, thereby improving the assembly quality of the rear duct. The rear guide vane is then placed in the guide vane mounting groove of the processing tooling and then secured using a U-shaped horse plate and a latch. The guide vane mounting groove supports the rear guide vane from below, and the U-shaped horse plate presses the rear guide vane from above to secure it. The latch is then inserted into the process block of the rear guide vane and the U-shaped horse plate, further improving the securing effect. Therefore, the present invention has a better securing effect on the rear guide vane.

[0040] 3. In a method for manufacturing a rear guide vane according to the present invention, in the eighth step, welding is first performed on a weld seam of a random rear guide vane, then on weld seams of rear guide vanes symmetrically distributed with the rear guide vane, and the aforementioned process is repeated until all rear guide vanes are welded. Welding the rear guide vanes in this order ensures a normal temperature on the rear guide vanes and helps maintain stable welding quality. If all weld seams on a rear guide vane are welded at once, the temperature of the rear guide vane will increase abnormally, which will reduce the welding quality of the rear guide vane. Therefore, the welding effect of the present invention is better.

[0041] 4. In the manufacturing method of a rear duct according to the present invention, in the fifth step, the vertical tolerance of the inner liner ring is less than or equal to 1 mm, the deviation between the first, second, and third longitudinal ribs and the machined scale lines is less than or equal to 0.5 mm, and the vertical tolerance of the first and second transverse annular ribs is less than or equal to 1 mm. This ensures precise component positioning, thereby ensuring high-quality rear duct. In the third step, welding is performed in the order of first weld, second weld, third weld, fourth weld, fifth weld, sixth weld, seventh weld, and eighth weld, ensuring stable welding temperature and improving the welding quality of the outer shell assembly body. Therefore, the rear duct according to the present invention has high quality.

[0042] 5. In the method for manufacturing a rear duct according to the present invention, in the third step, an annular support is first secured to the inner hole of the inner liner ring, followed by the first longitudinal rib. In the fourth step, the annular support is removed after welding. The annular support maintains the roundness of the inner liner ring, preventing deformation during subsequent assembly and welding steps. Therefore, the outer shell assembly of the present invention achieves a good roundness.

[0043] 6. In the method for manufacturing a rear duct according to the present invention, in the first step, an assembly line is drawn on the front flange plate, and then the front flange plate, hub ribs, and hub shaft are assembled and fixed. Then, an assembly line is drawn on the rear flange plate, and then the rear flange plate is assembled. The assembly line assists in assembling components, ensuring precise positioning of the components, thereby improving assembly quality. Therefore, the present invention achieves a better assembly effect.

[0044] 7. In the method for manufacturing a rear conduit according to the present invention, stress annealing is required in steps 4 and 8. This stress annealing can eliminate stress within the rear conduit and housing assembly, thereby preventing deformation and cracking of the rear conduit and housing assembly, and making the rear conduit more stable and reliable during subsequent applications. Therefore, the present invention has strong stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of the present invention.

[0046] Figure 2 yes Figure 1 Schematic diagram of the structure of the mid-posterior duct.

[0047] Figure 3 yes Figure 1 Schematic diagram of the structure of the hub body.

[0048] Figure 4 yes Figure 3 main view.

[0049] Figure 5 yes Figure 4 Top view of .

[0050] Figure 6 yes Figure 1 Schematic diagram of the structure of the middle liner ring.

[0051] Figure 7 yes Figure 6 Schematic diagram of the structure of the middle lining plate.

[0052] Figure 8 yes Figure 1 Schematic diagram of the structure of the first longitudinal reinforcement plate.

[0053] Figure 9 yes Figure 8 Schematic diagram of the structure of the first transverse ring reinforcement.

[0054] Figure 10 yes Figure 1 Schematic diagram of the structure of the second longitudinal rib.

[0055] Figure 11 yes Figure 10 Schematic diagram of the structure of the second longitudinal rib.

[0056] Figure 12 yes Figure 1 Schematic diagram of the structure of the third longitudinal rib.

[0057] Figure 13 yes Figure 12 Schematic diagram of the structure of the first weld.

[0058] Figure 14 yes Figure 12 Schematic diagram of the structure of the second weld.

[0059] Figure 15 yes Figure 1 Schematic diagram of the structure of the first outer sealing plate.

[0060] Figure 16 yes Figure 15 Schematic diagram of the structure of the second outer sealing plate.

[0061] Figure 17 yes Figure 1 Schematic diagram of the structure of the processing tooling.

[0062] Figure 18 yes Figure 17 Top view of .

[0063] Figure 19 yes Figure 1 Schematic diagram of the structure of the middle and rear guide vanes.

[0064] Figure 20 yes Figure 19 Schematic diagram of the structure of the middle U-shaped horse plate.

[0065] 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, pin 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 point 94. DETAILED DESCRIPTION

[0066] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0067] See Figure 1 — Figure 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:

[0068] Step 1: 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;

[0069] Step 2: Welding the hub body 1: First, weld the welds between the hub body ribs 12 and the front flange plate 11 in sequence, then weld the welds between the hub body ribs 12 and the rear flange plate 14 in sequence, and then obtain the hub body 1;

[0070] 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, and 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, and 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, 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 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;

[0071] Step 4: Welding the main body of the shell assembly 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 ring rib 5, the second longitudinal rib plate 41, the second transverse ring rib 51, and the third longitudinal rib plate 42 in the specified order, and then obtain the main body of the shell assembly 2;

[0072] 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;

[0073] Step 6: Weld the outer seal of the housing assembly 2: first weld the welds between the first outer seal plate 6 and the second longitudinal rib plate 41, then weld the welds between the second outer seal plate 61 and the third longitudinal rib plate 42, and then obtain the housing assembly 2;

[0074] 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 put the 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 tack welding on the connection between the rear guide vane 8, the hub body 1 and the shell assembly 2;

[0075] Step 8: Welding the rear duct: 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.

[0076] 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, 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.

[0077] In the seventh step, the processing tool 7 is placed on the assembly platform 3 to first ensure that the flatness of the bottom plate of the processing tool 7 meets the requirements, and then the processing tool 7 is placed on the assembly platform 3;

[0078] In the seventh step, the shell component 2 is put on the outside of the processing tool 7 by first putting the shell component 2 on the outside of the processing tool 7, then positioning the inner hole of the 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 shell component 2 and the aforementioned ribs 74 meet the requirements, thereby ensuring that the concentricity of the shell component 2 and the hub body 1 meets the requirements.

[0079] 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 arbitrarily 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 that is symmetrical to the aforementioned rear guide vane 8 for welding, and then arbitrarily 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 that is 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 vanes 8 and the hub body 1 and the shell assembly 2 are completed.

[0080] 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 1 millimeter;

[0081] 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 on 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.

[0082] In the third step, the first transverse ring 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 ring 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.

[0083] In the third step, the plurality of second longitudinal ribs 41 are sequentially placed on the first transverse annular rib 5 by first drawing machining lines on 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.

[0084] 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 of 25, and the third vertical tolerance 25 is less than or equal to 1 mm.

[0085] In the third step, the plurality of third longitudinal ribs 42 are placed sequentially on the second transverse ring rib 51 by first drawing machining lines of the plurality of third longitudinal ribs 42, and then placing the plurality of third longitudinal ribs 42 sequentially on the second transverse ring rib 51, wherein the deviation between the third longitudinal ribs 42 and the machining lines is less than or equal to 0.5 mm.

[0086] In the fourth step, the welds between the inner lining ring 22, the inner lining plate 21, the first longitudinal rib 4, the first transverse ring rib 5, the second longitudinal rib 41, the second transverse ring rib 51, and the third longitudinal rib 42 are welded in the specified order, first welding the first weld 26 between the inner lining ring 22 and the inner lining plate 21, then welding the second weld 261 between the first longitudinal rib 4 and the inner lining plate 21, the first transverse ring rib 5, and the inner lining ring 22, then welding the third weld 262 between the inner lining ring 22 and the first transverse ring rib 5, then welding the fourth weld 263 between the second longitudinal rib 41 and the first transverse ring rib 5, the second transverse ring rib 51, and the inner lining ring 22, then welding the fifth weld 264 between the inner lining ring 22 and the second transverse ring rib 51, and then welding the sixth weld 265 between the third longitudinal rib 42 and the second transverse ring rib 51 and the inner lining ring 22.

[0087] 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;

[0088] 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.

[0089] 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 the 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;

[0090] 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 .

[0091] 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;

[0092] In the eighth step, the rear conduit is obtained by first obtaining the rear conduit and then performing stress annealing on the rear conduit.

[0093] The supplementary description of the present invention is as follows:

[0094] The welding described in the present invention refers to: welding parts by manual tungsten inert gas arc welding, with a current of 140 to 160 amps and welding material of GTS-316L, ф2 mm.

[0095] Example 1:

[0096] See Figure 1 — Figure 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:

[0097] Step 1: 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;

[0098] Step 2: Welding the hub body 1: First, weld the welds between the hub body ribs 12 and the front flange plate 11 in sequence, then weld the welds between the hub body ribs 12 and the rear flange plate 14 in sequence, and then obtain the hub body 1;

[0099] 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, and 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, and 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, 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 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;

[0100] Step 4: Welding the main body of the shell assembly 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 ring rib 5, the second longitudinal rib plate 41, the second transverse ring rib 51, and the third longitudinal rib plate 42 in the specified order, and then obtain the main body of the shell assembly 2;

[0101] 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;

[0102] Step 6: Weld the outer seal of the housing assembly 2: first weld the welds between the first outer seal plate 6 and the second longitudinal rib plate 41, then weld the welds between the second outer seal plate 61 and the third longitudinal rib plate 42, and then obtain the housing assembly 2;

[0103] 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 put the 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 tack welding on the connection between the rear guide vane 8, the hub body 1 and the shell assembly 2;

[0104] Step 8: Welding the rear duct: 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.

[0105] Example 2:

[0106] The basic content is the same as Example 1, except that:

[0107] See Figure 1 — Figure 20 In the seventh step, the rear guide vanes 8 and the processing tool 7 are assembled by first placing the rear guide vanes 8 in the guide vane mounting slots 71 of the processing tool 7, then using the U-shaped slats 72 to sequentially press all the rear guide vanes 8, and then inserting the pins 73 into the U-shaped slats 72 and the process blocks 81 of the rear guide vanes 8 to secure the U-shaped slats 72 and the process blocks 81. In the seventh step, the processing tool 7 is placed on the assembly platform 3 to ensure that the flatness of the bottom plate of the processing tool 7 meets the requirements, and then the processing tool 7 is placed on the assembly platform 3. In the seventh step, the shell assembly 2 is placed on the outside of the processing tool 7 to ensure that the shell assembly 2 meets the requirements. Then, the inner hole of the shell assembly 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 assembly 2 and the ribs 74 meets the requirements, thereby ensuring that the concentricity of the shell assembly 2 and the hub body 1 meets the requirements.

[0108] 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 are 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 ensured to have its relative position by machining, 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.

[0109] Example 3:

[0110] The basic content is the same as Example 1, except that:

[0111] See Figure 1 — Figure 20In the eighth step, the welding of the connection points between the rear guide vane 8 and the hub body 1 and the shell assembly 2 in the specified order is as follows: first, randomly selecting a weld seam at the connection point between the rear guide vane 8 and the hub body 1 and the shell assembly 2 for welding, then selecting a weld seam at the connection point between the rear guide vane 8 and the hub body 1 and the shell assembly 2 that is symmetrical to the aforementioned rear guide vane 8 for welding, then randomly selecting a weld seam at the connection point between the rear guide vane 8 and the hub body 1 and the shell assembly 2 for welding, then selecting a weld seam at the connection point between the rear guide vane 8 and the hub body 1 and the shell assembly 2 that is symmetrical to the aforementioned rear guide vane 8 for welding, and repeating the above process until all weld seams at the connection points between the rear guide vane 8 and the hub body 1 and the shell assembly 2 are welded. Preferably, in the eighth step, the welding gas flow rate is 15 to 20 liters per minute, and the welding speed is 18 to 20 centimeters per minute.

[0112] During application, in the eighth step, a weld seam of a rear guide vane 8 is first randomly selected for welding, and then a weld seam of a rear guide vane 8 symmetrical to the rear guide vane 8 is selected for welding, that is, all weld seams on a rear guide vane 8 will not be welded at one time, so as to ensure that excessively high temperature is not generated during welding, which will lead to a decrease in the welding quality of the rear guide vane 8.

[0113] Example 4:

[0114] The basic content is the same as Example 1, except that:

[0115] See Figure 1 — Figure 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, the second longitudinal ribs 41 are placed on the first transverse ring rib 5 in sequence, and the machining lines of the second longitudinal ribs 41 are drawn first, and then the second longitudinal ribs 41 are placed 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, the second transverse ring rib 51 is made to fall along the outer surface of the inner lining ring 22 to the top of the second longitudinal rib 41, and the second transverse ring rib 51 is made to fall along the outer surface of the inner lining ring 22 to the top of the second longitudinal rib 41. The top of the second longitudinal rib 41, the bottom of the second transverse ring rib 51 to the top of the first transverse ring rib 5 is the 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 placed in sequence on the second transverse ring rib 51 by first drawing the machining lines of the plurality of third longitudinal ribs 42, and then placing the plurality of third longitudinal ribs 42 in sequence on the second transverse ring rib 51, and the deviation of the third longitudinal ribs 42 from 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 4, the first transverse ring rib 5, the second longitudinal rib 41, the second transverse ring rib 51, and the third longitudinal rib 42 are welded in the specified order, first welding the first weld 26 between the inner lining ring 22 and the inner lining plate 21, then welding the second weld 261 between the first longitudinal rib 4 and the inner lining plate 21, the first transverse ring rib 5, and the inner lining ring 22, then welding the third weld 262 between the inner lining ring 22 and the first transverse ring rib 5, then welding the fourth weld 263 between the second longitudinal rib 41 and the first transverse ring rib 5, the second transverse ring rib 51, and the inner lining ring 22, then welding the fifth weld 264 between the inner lining ring 22 and the second transverse ring rib 51, and then welding the sixth weld 265 between the third longitudinal rib 42 and the second transverse ring rib 51 and the inner lining ring 22. 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.

[0116] 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 tack welding on the connection between the inner lining ring 22 and the inner lining plate 21; then draw the machining lines of multiple first longitudinal ribs 4, and then place multiple 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 tack welding on the connection between the first longitudinal ribs 4 and the inner lining plate 21, with a tack welding length of six to eight millimeters and a tack welding height of three to four millimeters; then drop the first transverse hoop rib 5 onto the first longitudinal rib 4, so that the second vertical tolerance 24 is less than or equal to one millimeter; then draw the machining lines of multiple second longitudinal ribs 41, and then place multiple second longitudinal ribs 41 on the first transverse hoop 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 the machining scale lines of multiple third longitudinal ribs 42 are drawn, and then multiple 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 connection points of 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; 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 temperature from being too high during welding.

[0117] Example 5:

[0118] The basic content is the same as Example 1, except that:

[0119] See Figure 1 — Figure 16 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 within 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 assembly 2 is obtained by first removing the annular support 9 and then obtaining the main body of the outer shell assembly 2. Preferably, the annular support 9 includes a first annular support 91, a second annular support 92, and a third annular support 93.

[0120] 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 positioning welded, with a positioning welding length of three to five millimeters, a weld length of fifteen to thirty millimeters, and eight circumferential spot welding; then multiple first longitudinal ribs 4 are placed on the inner lining plate 21 in sequence; in the fourth step, after 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 outer shell assembly 2 main body 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.

[0121] Example 6:

[0122] The basic content is the same as Example 1, except that:

[0123] See Figure 1 — Figure 5 In the first step, assembling the front flange plate 11, the hub rib plate 12, and the hub shaft 13 is performed by first drawing an assembly line of the hub rib plate 12 on the front flange plate 11, and then assembling the front flange plate 11, the hub rib plate 12, and the hub shaft 13. In the first step, assembling the rear flange plate 14 and the hub rib plate 12 is performed by first drawing an assembly line of the hub rib plate 12 on the rear flange plate 14, and then assembling the rear flange plate 14 and the hub rib plate 12. Preferably, in the second step, the gas flow rate during welding is 15 to 20 centimeters per minute, and the welding speed is 18 to 20 centimeters per minute.

[0124] 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 positioned 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 positioned welded.

[0125] Example 7:

[0126] The basic content is the same as Example 1, except that:

[0127] See Figure 1 — Figure 20In the fourth step, the shell component 2 main body is obtained by first obtaining the shell component 2 main body, and then stress annealing the shell component 2 main body; in the eighth step, the rear conduit is obtained by first obtaining the rear conduit, and then stress annealing the rear conduit.

[0128] During application, 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 tool 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.

[0129] 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 in 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: assembling the hub body (1): first assembling the front flange plate (11), the hub body rib plate (12) and the hub shaft (13), then tack welding 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 assembling the rear flange plate (14) and the hub body rib plate (12), then tack welding 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 ribs (12) and the front flange plate (11), then welding the welds between the hub body ribs (12) and the rear flange plate (14), 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 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), 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 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 shell component (2): first, weld the weld seams 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) in a 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: welding the outer seal of the housing assembly (2): first, welding the welds between the first outer seal plate (6) and the second longitudinal rib plate (41) in sequence, then welding the welds between the second outer seal plate (61) and the third longitudinal rib plate (42) in sequence, and then obtaining the housing assembly (2); Step 7: Assemble the rear guide tube: 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 put the shell assembly (2) on the outside of the processing tool (7), then assemble the rear guide vane (8) and 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 shell assembly (2); Step 8: Welding the rear duct: Weld the connection between the rear guide vane (8), the hub body (1), and the shell assembly (2) in a specified order to obtain 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 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).

3. The method for manufacturing a rear duct according to claim 2, wherein: In the seventh step, the processing tool (7) is placed on the assembly platform (3) by first ensuring that the flatness of the bottom plate of the processing tool (7) meets 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 the 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, wherein: In the eighth step, the connection between the rear guide vane (8) and the hub body (1) and the shell assembly (2) is welded in the specified order by first randomly selecting a weld seam at the connection between the rear guide vane (8) and the hub body (1) and the shell assembly (2) for welding, then randomly selecting a weld seam at the connection between the rear guide vane (8) and the hub body (1) and the shell assembly (2) that is symmetrical to the aforementioned rear guide vane (8) for welding, then randomly selecting a weld seam at the connection between the rear guide vane (8) and the hub body (1) and the shell assembly (2) for welding, then selecting a weld seam at the connection between the rear guide vane (8) and the hub body (1) and the shell assembly (2) that is symmetrical to the aforementioned rear guide vane (8) for welding, and repeating the aforementioned process until all the weld seams at the connection between the rear guide vane (8) and the hub body (1) and the shell assembly (2) are welded.

5. The method for manufacturing a rear duct according to claim 1, characterized in that: In the third step, placing the lining ring (22) on the top of the lining plate (21) is placing the lining ring (22) on the top of the lining plate (21), and the height from the bottom of the lining plate (21) to the top of the 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 on 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 ring 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 distance from the bottom of the first transverse ring 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 plurality of second longitudinal ribs (41) are sequentially placed on the first transverse ring rib (5) by first drawing machining lines on the plurality of second longitudinal ribs (41), and then sequentially placing the plurality of second longitudinal ribs (41) on the first transverse ring 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 ring 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 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 ribs (42) are sequentially placed on the second transverse ring rib (51) by first drawing machining lines on the plurality of third longitudinal ribs (42), and then sequentially placing the plurality of third longitudinal ribs (42) on the second transverse ring rib (51), 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 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 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 ring 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, 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.

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, 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.

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