Auxiliary device and manufacturing method for manufacturing large thin-wall box products

Abstract

The present invention provides an auxiliary device and a manufacturing method for large thin-walled box-type products. The large thin-walled box-type products include a top flange, a side wall flange, a segmented flange, a cylinder, a positioning flange, and a bottom flange. The auxiliary device for manufacturing includes a first tooling, a second tooling, and a third tooling. The first tooling is connected to the upper surface of the positioning flange, the lower surface of the second tooling is connected to the upper surface of the first tooling, the segmented flange prefabricated part is connected to the second tooling, and the lower surface of the third tooling is connected to the upper surface of the segmented flange prefabricated part; the outer edge of the positioning flange, the outer edge of the segmented flange prefabricated part, and the third tooling are all abutted against the inner wall of the cylinder; the present invention can simultaneously abut and support the bottom, middle, and upper part of the cylinder, avoid processing extrusion deformation of the cylinder, prevent welding deformation, and eliminate the occurrence of tool vibration during processing of the cylinder, and can effectively ensure the processing accuracy of the flange hole on the side wall of the cylinder.

Description

Technical Field

[0001] The present invention relates to the field of shipbuilding technology, and specifically to an auxiliary device for manufacturing large thin-walled box-type products and a manufacturing method for large thin-walled box-type products, and in particular to an auxiliary device for manufacturing a fixed box body of a straight-blade propeller and a manufacturing method for the fixed box body. Background Art

[0002] Dynamic positioning systems are designed to safely and efficiently operate a vessel's propulsion system, automatically controlling the vessel's position and heading during operations. Since many maritime missions place high demands on a vessel's position and heading, dynamic positioning systems play a key role in ensuring the successful completion of such operations. Therefore, they have become a must-have for many offshore vessels.

[0003] In order to meet the special needs of some domestic ships in the future, the use of straight-wing propeller propulsion system as the ship's propeller has become a better solution. The straight-wing propeller propulsion system generally consists of straight-wing propeller propeller, transmission shaft, gearbox and main engine, etc. The specific system structure is as follows Figure 1 As shown in the figure, due to the technical complexity and application problems of the straight-wing propeller propulsion system, there is little research on the straight-wing propeller propeller in China. As the key actuator in the straight-wing propeller system, the straight-wing propeller propeller has almost no application in the domestic shipbuilding field.

[0004] Straight propeller, also known as cycloid propeller, is a propulsion tool that installs a set of sword-shaped blades vertically on the bottom disc with a fixed radius around the center point of the disc. Its specific structure is as follows Figure 2 As shown in the figure, the thrust magnitude and direction of the straight-wing propeller are infinitely adjustable. Due to their excellent maneuverability, they are widely used on special surface work vessels with large load variations and high maneuverability requirements. The straight-wing propeller generates thrust through blades that extend from the bottom of the vessel and oscillate back and forth around a vertical axis. The blades are mounted on a rotating housing that is flush with the bottom of the vessel.

[0005] The main structure of the straight propeller is divided into two parts: the hull-mounted fixed part and the rotating propulsion part. The installation box of the hull-mounted fixed part is called the fixed box, and the box of the rotating propulsion part is the rotating box. The specific structure is as follows Figure 3 As shown. For the fixed box, the main installation is the drive input shaft, the direction thrust control cylinder and the inclined turntable connected to the rotating box. The rotating box is mainly installed with the control rod, the blade hinge mechanism and the blade. Figure 4 shown.

[0006] The fixed housing, a key structural element of a straight-blade propeller, serves as the mounting and positioning foundation for the actuators and also as a reservoir for the lubricating fluid used to lubricate the operating mechanism. Therefore, the mounting interface and positioning accuracy of the housing must be high, and the overall sealing of the housing must be high, with no oil leakage permitted. To ensure the overall lightweight design of the vessel, the main structure of the fixed housing often utilizes a welded structure consisting of thin plates and forgings.

[0007] As a large thin-walled box product, the fixed box is made of high-quality stainless steel and forgings. The box structure is complex and difficult to manufacture. Therefore, the manufacturing cost of the product is high, reaching millions of yuan. The qualified rate of finished products has a great impact on the manufacturing cost. In the initial manufacturing process of the existing fixed box, conventional symmetrical welding technology is mainly used. The welding manufacturing process repeatedly measures the deformation of the box to guide the correction of deformation, the modification of the process and the addition of relevant auxiliary tooling to ensure that the quality of the final box product meets the requirements. However, deformation still occurs from time to time during the actual implementation. At the same time, after the conventional segmented flanges are assembled and welded separately, the existing technology processes the flange holes on the side wall of the cylinder according to the disconnection position of the segmented flanges. This places high demands on the level of manufacturing personnel, and the assembly needs to consider the reverse welding deformation. The welding process is complex and the welding deformation is difficult to control. At the same time, the deformation after welding is still serious. After welding, the side wall flange hole of the cylinder vibrates severely, and the processing causes the cylinder and the segmented flange to be misaligned at the disconnection position, making it impossible to repair it again later. This makes the existing technology time-consuming and labor-intensive in the manufacturing process, resulting in low manufacturing efficiency. Product returns and scrapping often occur, causing economic losses to the company. At the same time, it is unable to meet the manufacturing requirements of batch products, seriously restricting the product supply cycle and output value growth.

[0008] For the production and manufacturing of large thin-walled box products, such as fixed boxes, uneven heating during the welding process will produce relatively obvious local stress concentration and cause deformation. The deformation will affect the performance, dimensional accuracy and dimensional stability of the box, and ultimately affect the overall quality of the box. Therefore, large stainless steel thin-walled welded boxes place high demands on the manufacturing process, the operating level of the welders, and the anti-deformation measures during the manufacturing process. In particular, some thin-walled stainless steel box products with complex structures have uneven overall force due to the intricate spatial layout of the welds, resulting in large stress concentration in the box, and ultimately irreversible welding deformation. Even insufficient local processing allowances lead to product scrapping, causing serious economic losses to the manufacturing company.

[0009] In addition, the fixed box is often cylindrical and needs to be connected to the external pipeline. During the design, it is necessary to make connection installation flange holes at different angles on the side wall of the cylinder. Due to the thin thickness of the cylinder plate, the processing of the holes often causes the cylinder to be squeezed and deformed during processing by the processing equipment. At the same time, the cylinder itself vibrates during processing, resulting in low processing efficiency. The angle error of the cylinder installation flange hole after processing is large, which makes it impossible to repair the hole on the side wall of the cylinder and causes it to be scrapped.

[0010] At the same time, due to the need to install other equipment in the fixed box, an annular mounting positioning flange will be set in the fixed box. In terms of spatial assembly, the annular mounting positioning flange intersects with the flange hole on the side wall of the box, resulting in the annular mounting positioning flange being broken into multiple segmented annular mounting positioning flanges (referred to as "segmented flanges"). Due to the strict distance restrictions between the segmented flanges and the processing requirements such as minimum thickness and horizontality of the segmented flanges, the segmented flanges are connected to the cylinder by welding in the process. If the traditional conventional method is used to weld each segmented flange to the cylinder one by one, in actual operation, such welding will not meet the height distance requirements of the segmented flanges after assembly. The distance in the arc direction between the two adjacent segmented flanges and the resulting position angle are difficult to accurately control. At the same time, the segmented flanges are severely deformed after welding and cannot meet the design requirements of the minimum thickness and horizontality of the flanges after processing. At the same time, the deformation of the segmented flange welding will also cause the deformation of the cylinder at that position, further causing errors in the position and angle of the flange holes on the side wall of the cylinder. The accumulation of multiple errors will eventually lead to insufficient margins in the later processing of the box, resulting in product scrapping and causing serious economic losses to the manufacturing company.

[0011] The above can be simply summarized as follows: for the production and manufacturing of large thin-walled box products, taking fixed boxes as an example, how to solve the problem of easy deformation of thin-walled cylinders during processing to ensure the accuracy of hole processing on the side walls of thin-walled cylinders; how to accurately install the segmented flanges in terms of height, position and angle, and how to avoid welding deformation of the segmented flanges; how to control the welding deformation of the final cylinder through the reasonable installation and construction welding sequence of the inner and outer flanges of the fixed box, the tooling device and the cylinder.

[0012] Based on this, the applicant filed this application. Summary of the Invention

[0013] In view of this, the present invention aims to propose an auxiliary device and manufacturing method for the manufacture of large thin-walled box-type products, so as to solve the problems of easy deformation of thin-walled cylinders and low precision of hole machining on the side walls of thin-walled cylinders in the production and manufacturing process of large thin-walled box-type products such as fixed boxes in the prior art.

[0014] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0015] An auxiliary device for manufacturing large thin-walled box-like products, the large thin-walled box-like products comprising a top flange, a side wall flange, a segmented flange, a cylinder, a positioning flange, and a bottom flange, the segmented flange being processed from a segmented flange preform; the auxiliary device for manufacturing comprises a first tooling, a second tooling, and a third tooling, the first tooling being detachably connected to the upper surface of the positioning flange, the lower surface of the second tooling being detachably connected to the upper surface of the first tooling, the segmented flange preform being detachably connected to the second tooling, and the lower surface of the third tooling being detachably connected to the upper surface of the segmented flange preform; the outer edge of the positioning flange, the outer edge of the segmented flange preform, and the third tooling all abut against the inner wall of the cylinder.

[0016] Furthermore, a first assembly hole and an assembly groove are provided on the upper surface of the positioning flange, a fourth assembly hole is provided on the first tooling, the first assembly hole and the fourth assembly hole are connected by fasteners, and a limiting boss is provided on the lower surface of the first tooling, and the limiting boss can be engaged with the assembly groove for limiting.

[0017] Furthermore, the segmented flange preform is a circular plate, and at least two notches are provided on the outer edge of the segmented flange preform, so that the outer edge of the segmented flange preform is divided into at least two sections.

[0018] Furthermore, the segmented flange preform is provided with a second assembly hole, the second tooling includes a support tube, the segmented flange preform can be surrounded by the outer space of the support tube, the upper end outer wall of the support tube is provided with a first upper plate, the first upper plate is provided with a seventh assembly hole, the lower surface of the first upper plate is fitted with the upper surface of the segmented flange preform, and the second assembly hole and the seventh assembly hole are connected by fasteners.

[0019] Furthermore, a limiting step is provided on the lower surface of the first upper plate, and the limiting step can be engaged with the inner edge of the segmented flange prefabricated component for limiting position.

[0020] Furthermore, a first lower plate is provided on the inner wall of the lower end of the support tube, a sixth assembly hole is provided on the first lower plate, a fifth assembly hole is provided on the upper surface of the first tooling, the lower surface of the first lower plate is fitted with the upper surface of the first tooling, and the fifth assembly hole and the sixth assembly hole are connected by fasteners.

[0021] Furthermore, a limiting ring groove is provided on the upper surface of the first tooling, and the fifth assembly hole is located in the limiting ring groove. The lower end surface of the support cylinder and the lower surface of the first lower plate are both fitted with the bottom of the limiting ring groove. The first lower plate is a circular plate body, and the inner edge of the first lower plate is clamped and limited with the inner side of the limiting ring groove.

[0022] Furthermore, the segmented flange preform is provided with a third assembly hole, the third tooling includes a support tube, the inner wall of the lower end of the support tube is provided with a second lower plate, the second lower plate is provided with an eighth assembly hole, the lower end face of the support tube and the lower surface of the second lower plate are both fitted with the upper surface of the segmented flange preform, and the third assembly hole and the eighth assembly hole are connected by fasteners; the second lower plate is a circular plate body, and the inner edge of the second lower plate is clamped and limited with the outer edge of the first upper plate of the second tooling.

[0023] Furthermore, a second upper plate is provided on the upper end surface of the support tube, and the outer edge of the second upper plate abuts against the inner wall of the cylindrical body.

[0024] A method for manufacturing a large thin-walled box-like product, using the auxiliary device for manufacturing the large thin-walled box-like product, the manufacturing method comprising:

[0025] S1. Place the positioning flange on the assembly platform, assemble the first tooling to the upper surface of the positioning flange, and connect and fix the first tooling and the positioning flange with fasteners to form a first assembly component;

[0026] S2. Place the second fixture on the assembly platform with the upper surface of the first upper plate facing downward, insert the segmented flange prefabricated component onto the outer side of the support tube of the second fixture, abut the inner edge of the segmented flange prefabricated component against the limiting step of the first upper plate, and connect and secure the segmented flange prefabricated component and the second fixture with fasteners to form a second assembly component;

[0027] S3. With the lower surface of the first lower plate of the second tooling facing downward, hoist the second assembly component above the first assembly component. Position and engage the inner edge of the first lower plate with the retaining ring groove on the upper surface of the first tooling. Connect and secure the second tooling to the first tooling with fasteners, so that the first assembly component and the second assembly component are connected to form a third assembly component.

[0028] S4. Using the outer circumference of the positioning flange as a processing reference, perform secondary processing on the outer circumference of the segmented flange prefabricated component so that the outer circumference diameter φM of the segmented flange prefabricated component is equal to the outer circumference diameter φN of the positioning flange, thereby ensuring the concentricity of the positioning flange and the segmented flange prefabricated component during assembly with the cylindrical body;

[0029] S5. Place the bottom flange on the assembly platform, mark the outer circle line of the positioning flange and the outer circle line of the cylinder on the upper surface of the bottom flange, and assemble the second assembly component to the bottom flange with the positioning flange facing downward, so that the stop step at the bottom of the positioning flange is aligned with the step of the center hole of the bottom flange;

[0030] S6. Insert the cylinder from above the second assembly component so that the cylinder is sleeved on the outside of the second assembly component, and fit the lower end surface of the cylinder to the upper surface of the bottom flange;

[0031] S7, spot welding the contact points between the inner wall of the cylinder and the outer edge of the segmented flange prefabricated member;

[0032] S8. Lift the third tooling into the cylinder from the upper end of the cylinder, place the third tooling above the segmented flange preform, position and engage the inner edge of the second lower plate of the third tooling with the outer edge of the first upper plate of the second tooling, fit the lower side of the third tooling to the upper surface of the segmented flange preform, and fasten the third tooling and the segmented flange preform with fasteners, thereby connecting the third tooling to the third assembly component;

[0033] S9. The third tooling, the third assembly component, and the cylindrical body are recorded as a fourth assembly component. The fourth assembly component is hoisted as a whole using the lifting lug structure of the third tooling and separated from the bottom flange.

[0034] S10, turning over the fourth assembly component with the bottom surface of the positioning flange facing upward, and placing it on the assembly platform, and welding the weld between the positioning flange and the cylindrical body;

[0035] S11. Using the bottom surface and inner surface of the positioning flange as reference, process the upper end surface of the cylinder;

[0036] S12. Align the top flange with the upper end face of the cylinder so that the concentricity between the top flange and the inner circle of the cylinder is ≤ 0.2 mm, and then weld the top flange to the upper end face of the cylinder;

[0037] S13. Using the position of the notch of the segmented flange prefabricated component and the lower end surface of the cylinder as a reference, mark the positioning center position of each side wall flange on the side wall of the cylinder;

[0038] S14, boring the side wall of the cylinder using a CNC boring and milling machine at the positioning center position marked out in step S13 to form flange holes on each side wall;

[0039] S15, assembling the fourth assembly component processed in step S14 to the bottom flange with the positioning flange facing downward, so that the stopper step at the bottom of the positioning flange is aligned with the center hole step of the bottom flange to form a fifth assembly component;

[0040] S16. Weld the cylindrical body to the bottom flange, then flip the entire fifth assembly component over with the lower surface of the bottom flange facing upward, and weld the weld between the positioning flange and the inner hole of the bottom flange;

[0041] S17. Install the first flange, the second flange, the third flange, and the fourth flange into the corresponding side wall flange holes of the cylindrical body one by one, spot weld each side wall flange to the cylindrical body, and then weld the first flange, the second flange, the third flange, and the fourth flange to the outer wall of the cylindrical body, respectively, and weld the first flange and the second flange to the top flange, respectively.

[0042] S18, disassembling the third tool from the fifth assembly component, and welding the first flange and the second flange to the inner wall of the cylinder respectively;

[0043] S19, welding the outer edge of the upper surface of the segmented flange prefabricated component to the inner wall of the cylinder;

[0044] S20, disassembling and removing the second tooling, and welding the outer edge of the lower surface of the segmented flange prefabricated component, the third flange, and the fourth flange to the inner wall of the cylinder respectively;

[0045] S21. Weld the outer edge of the upper surface of the positioning flange to the inner wall of the cylinder, and then disassemble and remove the first tooling to obtain a product intermediate.

[0046] Compared with the prior art, the auxiliary device and manufacturing method for manufacturing large thin-walled box products described in the present invention have the following advantages:

[0047] The present invention describes an auxiliary device and manufacturing method for manufacturing large thin-walled box-type products. The segmented flange prefabricated part and the positioning flange are connected by a first tooling and a second tooling, and the third tooling is continued to be set to form a preassembled body in the cylinder. The preassembled body can simultaneously abut and support the bottom, middle and upper parts of the cylinder, so that there is a relatively evenly distributed support effect in the cylinder. Whether it is welding processing or flange hole processing on the side wall of the cylinder, it can effectively avoid the deformation of the thin-walled cylinder during processing and can effectively maintain the roundness of the cylinder; at the same time, after the preassembled body is properly welded to the inside of the cylinder, the flange hole is then processed on the side wall of the cylinder, which avoids the extrusion deformation of the cylinder and the vibration of the cylinder during processing, and can effectively guarantee the processing accuracy of the flange hole on the side wall of the cylinder.

[0048] In addition, after the segmented flange preform and the positioning flange are pre-installed by manufacturing auxiliary devices, the outer circumference of the positioning flange and the cylindrical body is used as the processing reference, and the outer circumference of the segmented flange preform and the cylindrical body is secondary processed. This can ensure the concentricity of the outer circle of the segmented flange preform and the positioning flange assembly, and also prevent spatial interference from occurring when assembled with the cylindrical body.

[0049] At the same time, on the basis of the pre-assembled body simultaneously supporting the bottom, middle and upper parts of the cylinder, the top flange is welded to the cylinder, and the center of the flange hole is located with the help of marking on the side wall of the cylinder, and the flange hole on the side wall of the cylinder is processed. This can ensure that the positioning accuracy of the hole of the cylinder and its rigidity meet the processing requirements during the processing, and no vibration or deformation occurs during the processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0051] Figure 1 It is a structural diagram of a straight-wing propeller propulsion system in the prior art;

[0052] Figure 2 A schematic diagram of a straight-wing propeller and its installation position in the prior art;

[0053] Figure 3 It is a structural diagram of a straight-wing propeller in the prior art;

[0054] Figure 4 This is a structural diagram of a straight-wing propeller in the prior art;

[0055] Figure 5 This is a schematic structural diagram of a large thin-walled box product (taking the fixed box of a straight-blade propeller as an example) according to an embodiment of the present invention;

[0056] Figure 6 For the present invention Figure 5 Cross-sectional view along the AA axis;

[0057] Figure 7 For the present invention Figure 5 A partial enlarged view of point B in the middle;

[0058] Figure 8 For the present invention Figure 5 A partial enlarged view of point C in the middle;

[0059] Figure 9 This is a structural schematic diagram of a segmented flange prefabricated component in a large thin-walled box product according to an embodiment of the present invention (including front and side perspectives);

[0060] Figure 10 This is a schematic structural diagram of the first tooling in an auxiliary device for manufacturing large thin-walled box-type products according to an embodiment of the present invention (including side and front perspectives);

[0061] Figure 11A schematic structural diagram of the second tooling in an auxiliary device for manufacturing large thin-walled box-type products according to an embodiment of the present invention (including side and front perspectives);

[0062] Figure 12 This is a schematic structural diagram of the third tooling in an auxiliary device for manufacturing large thin-walled box-type products according to an embodiment of the present invention (including side and front perspectives);

[0063] Figure 13 A schematic diagram of a first assembly component formed between a positioning flange and a first tooling according to an embodiment of the present invention;

[0064] Figure 14 This is a schematic diagram of forming a second assembly component between the segmented flange prefabricated component and the second tooling according to an embodiment of the present invention;

[0065] Figure 15 A schematic diagram of assembling a first assembly component and a second assembly component into a third assembly component according to an embodiment of the present invention;

[0066] Figure 16 A schematic diagram of assembling a third tool and a third assembly component according to an embodiment of the present invention;

[0067] Figure 17 This is a schematic structural diagram of a large thin-walled box-type product according to an embodiment of the present invention after being fully assembled using manufacturing auxiliary devices.

[0068] Description of reference numerals:

[0069] 1. Top flange; 2. Side flange; 21. First flange; 22. Second flange; 23. Third flange; 24. Fourth flange; 3. Segmented flange; 31. First flange; 32. Second flange; 33. Threaded hole; 4. Cylinder; 5. Positioning flange; 51. First assembly hole; 52. Slot; 53. Assembly slot; 6. Bottom flange; 7. Support rib; 71. Weld avoidance; 8. Segmented flange prefabricated part; 81. First flange body; 82. Second flange body; 83. Notch; 84. Pre-cut line; 85. Second assembly hole; 86 , the third assembly hole; 9, the first tooling; 91, the first lifting ear; 92, the limiting boss; 93, the limiting ring groove; 94, the fourth assembly hole; 95, the fifth assembly hole; 96, the avoidance opening; 10, the second tooling; 101, the support tube; 102, the first upper plate; 1021, the limiting step; 103, the first lower plate; 104, the second lifting ear; 105, the sixth assembly hole; 106, the seventh assembly hole; 11, the third tooling; 111, the support tube; 112, the second upper plate; 113, the second lower plate; 114, the third lifting ear; 115, the eighth assembly hole. DETAILED DESCRIPTION

[0070] The inventive concepts of the present disclosure will be described below using terms commonly used by those skilled in the art to convey the substance of their work to others skilled in the art. However, these inventive concepts can be embodied in many different forms and should not be considered limited to the embodiments described herein. Figure 5 (or attached Figure 17 , the two are in the same orientation) as the reference for conventional drawings, for example: Figure 5 The top flange 1 is located at the top and the bottom flange 6 is located at the bottom; Figure 17 The area near the central axis (or close to the central axis) is "inside", and correspondingly, the area away from the central axis is "outside".

[0071] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0072] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0073] As mentioned in the background technology of this application, taking the fixed box of the straight-wing propeller as an example, as a large thin-walled box product, especially a rotating body welded box, the existing technology often has the problem that the thin-walled cylinder is easy to deform during processing, resulting in low processing accuracy of the holes on the side walls of the thin-walled cylinder; and the segmented flange is difficult to install accurately in terms of height, position and angle, and the segmented flange and other components are prone to welding deformation and other problems.

[0074] As a large thin-walled box product, the fixed box has certain specification requirements. For example, the diameter range of a certain series of fixed boxes is 1500mm-6000mm, the height range is 600mm-5000mm, and the weight range is 500Kg-90000Kg. For a specific fixed box size and specification, you can refer to the existing technology, and this application does not impose too many restrictions.

[0075] In order to facilitate understanding of the solution, this application classifies the problems existing in the prior art and sets up corresponding embodiments for separate introduction.

[0076] Example 1

[0077] Given that the cylinder plate is relatively thin and flange holes are set at different angles on the side wall of the cylinder, the processing of the holes often causes extrusion and deformation of the cylinder during processing by the processing equipment. At the same time, the cylinder itself experiences vibration during processing, resulting in low processing efficiency. At the same time, the angle error of the flange hole installed on the processed cylinder is large, resulting in the inability to repair the hole on the side wall of the cylinder and resulting in scrapping.

[0078] Take the fixed box as an example, refer to the attached Figure 5, the cylinder 4 is rolled from a 6-15mm thin plate, and the side walls of the cylinder 4 need to be provided with corresponding side wall flanges 2 at different heights and angles. Accordingly, corresponding flange holes need to be opened on the side walls of the cylinder 4. If the holes are drilled directly when the plate of the cylinder 4 is cut, and the holes are opened first and then rolled with a margin at the hole opening position, the cylinder will be rolled into an elliptical shape, and the dimensional accuracy cannot be guaranteed. The difficulty of rounding after the rolling welding will also increase, and the edge processing of the flange hole may vibrate. In addition, since the fixed box body is welded with stainless steel plates and forgings as a whole, the stainless steel plates deform greatly during the welding process, and the deformation control of the box body during the welding process is a difficult point in the manufacturing process. Once the box body is deformed during welding, it will cause insufficient local processing allowance of the box body. For this reason, this embodiment mainly addresses the problems of easy deformation of thin-walled cylinders and low hole processing accuracy of the thin-walled cylinder side walls.

[0079] This embodiment provides an auxiliary device for manufacturing large thin-walled box products, as shown in the attached Figure 5-17 Before introducing the auxiliary devices for manufacturing, a brief introduction to the fixed box of the straight-wing propeller is first given.

[0080] Reference Attachment Figure 5 The fixed box body includes a top flange 1, a side wall flange 2, a segmented flange 3, a cylinder 4, a positioning flange 5, a bottom flange 6 and other components. The top flange 1 is connected to the top of the cylinder 4, and the bottom flange 6 is connected to the bottom of the cylinder 4. Each segmented flange 3 is connected to the inner wall of the cylinder 4, and each segmented flange 3 is at the same horizontal height. The positioning flange 5 is located on the bottom flange 6, and the positioning flange 5 is respectively connected to the inner wall of the cylinder 4 and the bottom flange 6. As for the side wall flange 2, the side wall flange 2 is connected to the side wall of the cylinder 4. The number, setting position, and horizontal height of the side wall flange 2 need to be determined according to actual product requirements. For example, this application sets 4 side wall flanges 2, which are respectively recorded as the first flange 21, the second flange 22, the third flange 23, and the fourth flange 24. The side wall flanges 2 of this application are for reference only, and this application does not impose specific restrictions on the setting of the side wall flanges 2.

[0081] Accordingly, the segmented flange 3 will inevitably interfere with a sidewall flange 2 at the same horizontal plane height. To this end, the segmented flange 3 needs to be arranged in sections to form a avoidance space. For example, in this application, two segmented flanges 3 are provided, respectively designated as flange section 1 31 and flange section 2 32. Two avoidance spaces are formed between the two on the circumference to avoid the third flange 23 and the fourth flange 24, respectively. This form of application is for reference only, and this application does not impose specific restrictions on the number of segmented flanges 3, the sidewall flange 2 to be avoided, and other settings.

[0082] The fixed box body adopts a welded structure as a whole, among which the top flange 1, segmented flange 3, cylindrical body 4 and bottom flange 6 are formed by plate processing, and the side wall flange 2 and positioning flange 5 are processed from forging blanks. Finally, after the various components are assembled and welded, the overall structure is finely processed to the required product size.

[0083] For the present application, especially the segmented flange 3, the present application does not process each flange segment one by one, but first regards each flange segment as a whole, processes the plate into a segmented flange prefabricated part 8, and then performs subsequent assembly and processing, and finally processes it into a segmented flange as needed.

[0084] Before welding the various components of the fixed box, the present application uses auxiliary devices to support the inside of the cylinder 4 to enhance the overall rigidity of the cylinder and pre-install the corresponding components.

[0085] The manufacturing auxiliary device is arranged in the cylindrical body 4, including a first tooling 9, a second tooling 10, and a third tooling 11. The first tooling 9 is connected to the upper surface of the positioning flange 5 in a detachable manner, the lower surface of the second tooling 10 is connected to the upper surface of the first tooling 9 in a detachable manner, the segmented flange preform 8 is connected to the second tooling 10 in a detachable manner, and the lower surface of the third tooling 11 is connected to the upper surface of the segmented flange preform 8 in a detachable manner; along the direction from bottom to top of the cylindrical body 4, the outer edge of the positioning flange 5, the outer edge of the segmented flange preform 8, and the third tooling 11 all abut against the inner wall of the cylindrical body 4.

[0086] Thus, the segmented flange preform 8 and the positioning flange 5 are connected by the first tooling 9 and the second tooling 10, and the third tooling 11 is continued to be set to form a preassembled body in the cylinder 4. The preassembled body can simultaneously abut and support the bottom, middle and upper parts of the cylinder 4, so that there is a relatively evenly distributed support effect in the cylinder 4. Whether it is welding processing or flange hole processing on the side wall of the cylinder 4, it can effectively avoid the deformation of the thin-walled cylinder 4 during the processing and can effectively maintain the roundness of the cylinder 4; at the same time, after the preassembled body is properly welded to the inside of the cylinder 4, the flange hole is then processed on the side wall of the cylinder 4, which avoids the extrusion deformation of the cylinder 4 and prevents the vibration of the cylinder 4 during processing, and can effectively guarantee the processing accuracy of the flange hole on the side wall of the cylinder 4.

[0087] In addition, after the segmented flange preform 8 and the positioning flange 5 are pre-installed by manufacturing auxiliary devices, the outer circumference of the positioning flange 5 and the cylindrical body 4 is used as the processing reference, and the outer circumference of the segmented flange preform 8 and the cylindrical body 4 is secondary processed. This can ensure the concentricity of the outer circle of the segmented flange preform 8 and the positioning flange 5 assembly, and also prevent spatial interference from occurring when assembled with the cylindrical body 4.

[0088] Regarding the assembly structure of the first tooling 9 and the positioning flange 5, the upper surface of the positioning flange 5 is provided with a first assembly hole 51 and an assembly groove 53, the first tooling 9 is provided with a fourth assembly hole 94, the first assembly hole 51 and the fourth assembly hole 94 are connected by fasteners, and the lower surface of the first tooling 9 is provided with a limiting boss 92, and the limiting boss 92 can be engaged with the assembly groove 53 to limit the position, so that when the first tooling 9 is seated on the positioning flange 5, it can be simply and conveniently positioned and assembled, and then the first tooling 9 or the positioning flange 5 is rotated to align the first assembly hole 51 and the fourth assembly hole 94, the first tooling 9 and the positioning flange 5 can be connected with fasteners to form a first assembly component, as shown in the attached figure. Figure 13 shown.

[0089] Regarding the assembly structure of the segmented flange preform 8 and the second tooling 10, the segmented flange preform 8 can be regarded as a circular plate, and at least two notches 83 are provided on the outer edge of the segmented flange preform 8, so that the outer edge of the segmented flange preform 8 is divided into at least two sections. Figure 9 , in two sections, respectively denoted as flange section one body 81 and flange section two body 82; correspondingly, attached Figure 9 The dotted line in the figure is a pre-cut line 84 for subsequent processing, which can be cut out in advance on the segmented flange prefabricated part 8 in the form of intermittent cutting, or it can be drawn on the segmented flange prefabricated part 8 in advance without cutting, or it can be not drawn. Figure 9 The pre-cut line 84 is for illustration only and may be an actual line or an imaginary line, so as to facilitate understanding of how the segmented flange preform 8 is cut from a plate to form a segmented segmented flange 3 in subsequent processing. The flange section 1 body 81 and the flange section 2 body 82 retained after cutting also correspond to the flange section 1 31 and the flange section 2 32, respectively.

[0090] As a preferred solution of the present application, the segmented flange preform 8 is provided with a plurality of pre-cutting lines 84, which are actually cut on the segmented flange preform 8. The setting of the pre-cutting lines 84 needs to be finally determined according to the shape of the actual flange segment to be retained, for example: Figure 9In the figure, the pre-cutting line 84 includes a first cutting line and a second cutting line corresponding to the end of each notch 83. The first cutting line is an annular cutting line and is colinear with the inner diameter circle of the segmented flange 3. The number of the second cutting lines is twice the number of the notches 83, so that a second cutting line is set corresponding to the end of each notch 83.

[0091] While processing the notch 83, the pre-cutting line 84 can also be processed together. For example, the pre-cutting line 84 can be cut on the segmented flange preform 8 by plasma cutting. Accordingly, the pre-cutting line 84 does not completely cut and separate the segmented flange preform 8, but cuts the pre-cutting line 84 in the form of intermittent cutting, or each section of the pre-cutting line 84 is regarded as a continuous incision, but the two ends of each incision are not completely cut off, maintaining the overall structure of the segmented flange preform 8. On the one hand, the overall mechanical strength of the segmented flange preform 8 is maintained to meet the normal assembly of the segmented flange preform 8 and the tooling. On the other hand, in the subsequent processing process, only the two ends of the incision are simply cut off with a grinding wheel, so that the excess part of the segmented flange preform 8 can be quickly cut off, shortening the later processing time and improving production efficiency.

[0092] The segmented flange preform 8 is provided with a second assembly hole 85, and the second tooling 10 includes a support tube 101. The segmented flange preform 8 can be surrounded by the outer space of the support tube 101, and the upper end outer wall of the support tube 101 is provided with a first upper plate 102, and the first upper plate 102 is provided with a seventh assembly hole 106. The lower surface of the first upper plate 102 is fitted with the upper surface of the segmented flange preform 8, and the second assembly hole 85 and the seventh assembly hole 106 are connected by fasteners; the lower surface of the first upper plate 102 is provided with a limiting step 1021, and the limiting step 1021 can be engaged and limited with the inner edge of the segmented flange preform 8, so that the segmented flange preform 8 and the second tooling 10 can be simply and conveniently positioned and assembled, and then the second assembly hole 85 and the seventh assembly hole 106 are aligned, so that the segmented flange preform 8 and the second tooling 10 can be connected by fasteners to form a second assembly component, as shown in the attached figure. Figure 14 As shown, with Figure 14 The workpiece is shown in an upside-down assembly state, mainly to facilitate the assembly operation. In the subsequent assembly, the second assembly component will be turned over to the attached Figure 15-17 The status shown.

[0093] The assembly between the second assembly component and the first assembly component specifically refers to the assembly between the first fixture 9 and the second fixture 10. A first lower plate 103 is provided on the inner wall of the lower end of the support cylinder 101. The first lower plate 103 is provided with a sixth assembly hole 105. The upper surface of the first fixture 9 is provided with a fifth assembly hole 95. The lower surface of the first lower plate 103 is in contact with the upper surface of the first fixture 9. The fifth assembly hole 95 and the sixth assembly hole 105 are connected by fasteners.

[0094] A limiting ring groove 93 is provided on the upper surface of the first tooling 9, and the fifth assembly hole 95 is located in the limiting ring groove 93. For the second tooling 10, the lower end surface of the support cylinder 101 and the lower surface of the first lower plate 103 are both in contact with the bottom of the limiting ring groove 93. The first lower plate 103 is a circular plate body. The inner edge of the first lower plate 103 is engaged with the inner side of the limiting ring groove 93 to limit the position, so that when the second assembly component is seated on the first assembly component, it can be positioned and assembled simply and conveniently. Then, the fifth assembly hole 95 and the sixth assembly hole 105 are aligned, and the second assembly component can be connected to the first assembly component by fasteners to form a third assembly component. Figure 15 shown.

[0095] The assembly between the third tooling 11 and the third assembly component specifically refers to the connection between the third tooling 11 and the segmented flange preform 8. The segmented flange preform 8 is provided with a third assembly hole 86. The third tooling 11 includes a support tube 111. The inner wall of the lower end of the support tube 111 is provided with a second lower plate 113. The second lower plate 113 is provided with an eighth assembly hole 115. The lower end surface of the support tube 111 and the lower surface of the second lower plate 113 are both in contact with the upper surface of the segmented flange preform 8. The third assembly hole 86 and the eighth assembly hole 115 are connected by fasteners.

[0096] The second lower plate 113 is a circular plate body. The inner edge of the second lower plate 113 is engaged with the outer edge of the first upper plate 102 of the second tooling 10, so that when the third tooling 11 is seated on the third assembly component, it can be simply and conveniently positioned and assembled. Then, the third assembly hole 86 and the eighth assembly hole 115 are aligned, and the third tooling 11 and the third assembly component can be connected by fasteners. Figure 16 shown.

[0097] A second upper plate 112 is provided on the upper end surface of the support tube 111 . The second upper plate 112 is also an annular plate. The outer edge of the second upper plate 112 fits against the inner wall of the cylinder 4 , so that the third tooling 11 can abut and support the upper part of the cylinder 4 .

[0098] The assembly of the cylindrical body 4 can be carried out according to the manufacturing method described below, provided that the cylindrical body 4 is supported by the positioning flange 5, the segmented flange preform 8, and the third tooling 11. The outer diameter of the first tooling 9 is larger than the inner diameter of the segmented flange preform 8, which inevitably causes spatial interference during disassembly. Therefore, the first tooling 9 is provided with an escape opening 96. If spatial interference is encountered during disassembly, the first tooling 9 can be rotated or tilted to avoid the escape opening 96, thereby ensuring that the first tooling 9 can be removed from the interior of the cylindrical body 4.

[0099] Furthermore, since during the assembly process, a certain assembly may be moved, flipped upside down, etc., according to the actual assembly operation, in order to facilitate the actual operation, the first fixture 9, the second fixture 10, and the third fixture 11 are all provided with lifting lug structures, such as the first lifting lug 91 of the first fixture 9, the second lifting lug 104 of the second fixture 10, and the third lifting lug 114 of the third fixture 11. This application does not impose excessive restrictions on the shape, number, and location of the lifting lug structures, as long as they can ensure the smooth and secure lifting of the assembly without causing spatial interference during lifting and without directly applying force to the components that secure the box.

[0100] After the above introduction to the structure, this embodiment introduces a method for manufacturing large thin-walled box products, which includes parts preparation and assembly.

[0101] The parts preparation process includes:

[0102] The bottom flange 6 is made of stainless steel plate, and after completion, the flange is welded. The upper and lower flange surfaces of the bottom flange 6 are rough-machined, wherein the flange thickness direction and outer circle are left with allowances, and the flange inner hole is machined to the design requirements of the drawing; preferably, the bottom flange 6 is also a circular plate body;

[0103] The cylinder 4 is made of stainless steel sheet. The height of the cylinder should be left with a margin. The length of the cylinder (corresponding to the circumference after rolling) should be calculated with a margin to ensure that the diameter of the cylinder after rolling is 0.5-1mm larger than the outer diameter of the positioning flange 5. After completion, the cylinder is welded and then rounded.

[0104] The positioning flange 5 is made of stainless steel forgings. During the rough machining process before welding the positioning flange 5 to the cylinder 4, the areas where the positioning flange 5 and the bottom flange 6 match, and the areas where the positioning flange 5 and the cylinder 4 match are all finely machined in place. Sufficient margins are left for the upper plane, bottom plane, flange inner circle and inner circle stand of the remaining positioning flange 5. The drilling depth and tapping depth of the first assembly hole 51 of the positioning flange 5 are calculated. The positioning flange 5 after rough machining can refer to the attached Figure 13 Instructions in

[0105] The segmented flange 3 is made of the segmented flange prefabricated part 8. The blanking material of the segmented flange prefabricated part 8 is a whole round stainless steel plate. The blanking plate thickness is required to be greater than 55mm. The flange thickness is processed to 50mm. The inner edge of the segmented flange prefabricated part 8 (that is, the inner edge that matches the limiting step 1021 of the second tooling 10) is finely processed. The outer diameter of the segmented flange prefabricated part 8 (that is, the outer diameter that matches the inner wall of the cylinder 4) reserves a 10mm margin to facilitate the subsequent secondary processing of the outer circle of the segmented flange prefabricated part 8. As the inner circle of the segmented flange prefabricated part 8 has been pre-processed, a 10mm margin is reserved. The portion to be cut away is left, and no margin is reserved; the second assembly hole 85 and the third assembly hole 86 are processed on the segmented flange prefabricated part 8, and after completion, the opening position of the notch 83 is marked on the segmented flange prefabricated part 8, and the notch 83 is pre-intermittently cut according to the marking position by wire cutting, and a 10mm connection section is left at each end of the cutting position, that is, the segmented flange prefabricated part 8 is not completely cut off, but only the notch 83 is cut out first, so as to ensure the overall structural integrity of the segmented flange prefabricated part 8 and to ensure that it has sufficient connection strength. The segmented flange prefabricated part 8 after rough processing is as follows Figure 9 As shown;

[0106] The top flange 1 is welded from stainless steel sheet metal. After rough machining, allowances must be left in the thickness and inner and outer diameters. The side flanges 2 are machined from forged blanks. Later, during assembly, they are welded to the corresponding flange holes on the side walls of the cylindrical body 4 to form a flange module. Allowances must be left on the end faces and inner holes of each side flange 2.

[0107] The assembly process includes:

[0108] S1. Place the positioning flange 5 on the assembly platform, assemble the first tool 9 to the upper surface of the positioning flange 5, and after passing the measurement, connect and fix the first tool 9 and the positioning flange 5 with fasteners to form a first assembly component;

[0109] S2. Place the second tooling 10 on the assembly platform with the upper surface of the first upper plate 102 of the second tooling 10 facing downward. Insert the segmented flange preform 8 onto the outer side of the support tube 101 of the second tooling 10. Abut the inner edge of the segmented flange preform 8 against the limiting step 1021 of the first upper plate 102. Connect and secure the segmented flange preform 8 and the second tooling 10 with fasteners to form a second assembly component.

[0110] S3. With the lower surface of the first lower plate 103 of the second tooling 10 facing downward, the second assembly component is hoisted above the first assembly component. The inner edge of the first lower plate 103 is positioned and engaged with the retaining ring groove 93 on the upper surface of the first tooling 9. The second tooling 10 and the first tooling 9 are connected and fixed using fasteners, so that the first assembly component and the second assembly component are connected to form a third assembly component.

[0111] S4. Using the outer circumference of the positioning flange 5 as a processing reference, perform secondary processing on the outer circumference of the segmented flange preform 8 so that the outer circumference diameter φM of the segmented flange preform 8 is equal to the outer circumference diameter φN of the positioning flange 5, thereby ensuring the concentricity of the positioning flange 5 and the segmented flange preform 8 during assembly with the cylindrical body 4, and preparing for the subsequent matching installation of the cylindrical body 4;

[0112] S5. Place the bottom flange 6 on the assembly platform, draw the outer circle line of the positioning flange and the outer circle line of the cylinder on the upper surface of the bottom flange 6, and assemble the second assembly component to the bottom flange 6 with the positioning flange 5 facing downward, so that the stop step at the bottom of the positioning flange 5 is aligned with the center hole step of the bottom flange 6;

[0113] In step S5, after the second assembly component is assembled with the bottom flange 6, it is checked and determined whether the first condition is met. If so, it is determined that the second assembly component and the bottom flange 6 are assembled qualified to ensure the accuracy of the step-by-step assembly of related components and minimize assembly errors.

[0114] The first condition includes: a gap between the upper plane of the bottom flange 6 and the lower plane of the positioning flange 5 is ≤0.02 mm; and an outer circle of the positioning flange 5 coincides with an outer circle line of the positioning flange drawn by the bottom flange 6 .

[0115] S6. Insert the cylinder 4 from above the second assembly component so that the cylinder 4 is sleeved on the outside of the second assembly component, and fit the lower end surface of the cylinder 4 to the upper surface of the bottom flange 6;

[0116] In step S6, after the cylinder 4 is loaded from above the second assembly component and fits with the bottom flange 6, it is checked and determined whether the second condition is met. If so, it is determined that the cylinder 4 is assembled qualified to ensure the accuracy of the step-by-step assembly of related components and minimize assembly errors.

[0117] The second condition includes: the gap between the lower end surface of the cylinder 4 and the upper surface of the bottom flange 6 is ≤0.02mm; and the outer circle of the cylinder 4 coincides with the outer circle line of the cylinder drawn by the bottom flange 6; and the gap between the inner wall of the cylinder 4 and the outer edge of the segmented flange preform 8 is uniform, and the error of the gap size is ≤0.5mm.

[0118] S7. Spot weld the inner wall of the cylinder 4 and the outer edge of the segmented flange preform 8; preferably, the spot welding interval is 200 mm per weld point on the circumference;

[0119] S8. Lift the third tooling 11 from the upper end of the cylinder 4 into the cylinder 4, place the third tooling 11 above the segmented flange preform 8, position and engage the inner edge of the second lower plate 113 of the third tooling 11 with the outer edge of the first upper plate 102 of the second tooling 10, fit the lower side of the third tooling 11 with the upper surface of the segmented flange preform 8, and connect and fix the third tooling 11 and the segmented flange preform 8 with fasteners, so that the third tooling 11 is connected to the third assembly component;

[0120] Correspondingly, the outer edge of the second upper plate 112 of the third tooling 11 is in contact with the inner wall of the cylinder 4 for support. After the assembly in step S8 is completed, the entire assembly component can only be lifted by the lifting ear structure of the third tooling 11.

[0121] S9. The third tooling 11, the third assembly component, and the cylindrical body 4 are recorded as a fourth assembly component. The fourth assembly component is lifted as a whole by the lifting lug structure of the third tooling 11 and separated from the bottom flange 6.

[0122] S10, flipping the fourth assembly component over with the bottom surface of the positioning flange 5 facing upward, and placing it on the assembly platform, welding the weld between the positioning flange 5 and the cylindrical body 4. Welding is completed when the weld size and quality requirements are met;

[0123] S11. Using the bottom surface and inner surface of the positioning flange 5 as reference, the upper end surface of the cylinder 4 is machined by a CNC vertical lathe to achieve the design height required by the drawing.

[0124] S12, aligning the top flange 1 with the upper end surface of the cylinder 4 so that the concentricity between the top flange 1 and the inner circle of the cylinder 4 is ≤ 0.2 mm, and then welding the top flange 1 to the upper end surface of the cylinder 4;

[0125] The top flange 1 is welded to the inner wall and outer wall of the upper end surface of the cylinder 4 respectively. This is a conventional welding technique and will not be described in detail. After the weld size and weld quality meet the requirements, the top flange 1 is welded.

[0126] S13, using the position of the notch 83 of the segmented flange preform 8 and the lower end surface of the cylinder 4 as a reference, mark the positioning center position of each side wall flange 2 on the side wall of the cylinder 4;

[0127] S14. Boring the side wall of the cylindrical body 4 using a CNC boring and milling machine at the center position marked in step S13 to form flange holes on the side wall. The programming of the machining process is set with reference to the marking line and the reference angle of the drawing space. After the boring is completed, the dimensions of the bored hole of the outer cylinder are inspected.

[0128] For the convenience of description, the manufacturing method of the present application also takes the four side wall flanges of the first flange 21, the second flange 22, the third flange 23, and the fourth flange 24 as examples, and processes the corresponding side wall flange holes respectively.

[0129] S15, with the positioning flange 5 facing downward, assemble the fourth assembly component processed in step S14 with the bottom flange 6, so that the stopper step at the bottom of the positioning flange 5 is aligned with the center hole step of the bottom flange 6 to form a fifth assembly component;

[0130] In step S15, after assembling the fourth assembly component processed in step S14 with the bottom flange 6, a check is performed to determine whether the third condition is met. If so, the assembly of the fourth assembly component with the bottom flange 6 is deemed qualified. The third condition includes: a clearance of ≤0.02 mm between the lower end surface of the cylindrical body 4 and the upper surface of the bottom flange 6; and the outer circumference of the cylindrical body 4 coincides with the outer circumference line drawn by the bottom flange 6. This ensures the accuracy of the step-by-step assembly of the relevant components and minimizes assembly errors.

[0131] S16. Weld the cylindrical body 4 to the bottom flange 6, and weld the weld therebetween to the design dimensions and quality as per the drawings. Then, flip the fifth assembly assembly over with the lower surface of the bottom flange 6 facing upward, and weld the weld between the positioning flange 5 and the inner hole of the bottom flange 6 to the design dimensions and quality as per the drawings.

[0132] S17. Install the first flange 21, the second flange 22, the third flange 23, and the fourth flange 24 one by one into the corresponding side wall flange holes of the cylindrical body 4. After the dimensions are inspected and found to be qualified, spot weld each side wall flange 2 to the cylindrical body 4. Then, weld the first flange 21, the second flange 22, the third flange 23, and the fourth flange 24 to the outer wall of the cylindrical body 4, respectively. Finally, weld the first flange 21 and the second flange 22 to the top flange 1, respectively, to ensure that the weld size and quality meet the requirements.

[0133] S18. Remove the third tool 11 from the fifth assembly component, and weld the first flange 21 and the second flange 22 to the inner wall of the cylindrical body 4, respectively, to ensure that the weld size and quality meet the requirements;

[0134] S19, welding the outer edge of the upper surface of the segmented flange prefabricated part 8 to the inner wall of the cylindrical body 4, ensuring that the weld size and quality meet the requirements;

[0135] S20, dismantle and remove the second tooling 10, and weld the outer edge of the lower surface of the segmented flange preform 8, the third flange 23, and the fourth flange 24 to the inner wall of the cylindrical body 4, respectively, to ensure that the weld size and quality meet the requirements;

[0136] It should be noted that the outer edge of the segmented flange preform 8 welded to the inner wall of the cylinder 4 in steps S19 and S20 actually refers to the outer edge of the segmented flange preform 8 in contact with the inner wall of the cylinder 4, and does not include the notch 83 of the segmented flange preform 8.

[0137] S21. Weld the outer edge of the upper surface of the positioning flange 5 to the inner wall of the cylindrical body 4 to ensure that the weld size and quality meet the requirements, and then remove the first tooling 9 to form a fixed box middle piece;

[0138] S22. Perform stress relief annealing on the entire fixed box middle piece according to process requirements to ensure that the stress is reduced to the minimum;

[0139] S23, use a grinding wheel machine to cut the segmented flange prefabricated part 8, and the cutting can be carried out along the attached Figure 9 The pre-cutting line 84 is cut, and the segmented flange prefabricated part 8 after cutting becomes the segmented flange 3;

[0140] For the sake of ease of description, the manufacturing method of this application is introduced using two segmented flanges 3 as an example, namely flange section 1 31 and flange section 2 32. Accordingly, the flange section 1 body 81 and flange section 2 body 82 retained after cutting can be directly used as flange section 1 31 and flange section 2 32.

[0141] S24, finishing the positioning flange 5, the bottom flange 6, the segmented flange 3, and the top flange 1 to the designed dimensions;

[0142] S25. Finish-machine each side wall flange 2 so that the inner hole and end face of the side wall flange 2 are machined to the design dimensions on the drawing. After completing the dimensional inspection, machine the threaded holes on the end faces of each side wall flange 2 to ensure the hole depth and thread depth.

[0143] S26. Process the threaded holes 33 of each segmented flange 3 and the screw holes of the top flange 1. After completion, check the hole depth and thread depth to obtain the large thin-walled box product, specifically the fixed box of the straight-wing propeller propeller.

[0144] Among them, after the drilling process in step S26, the dimensional accuracy of the fixed box is measured by a three-dimensional coordinate machine. If the measurement meets the design requirements, the fixed box product can be considered qualified.

[0145] Therefore, the present application uses the manufacturing method to connect the segmented flange preform 8 and the positioning flange 5 with the first tool 9 and the second tool 10, and continues to set the third tool 11 to form a preassembled body in the cylinder 4. The preassembled body can simultaneously abut and support the bottom, middle and upper parts of the cylinder 4, so that there is a relatively evenly distributed support effect in the cylinder 4. Whether it is welding processing or flange hole processing on the side wall of the cylinder 4, it can effectively avoid the deformation of the thin-walled cylinder 4 during the processing and can effectively maintain the roundness of the cylinder 4; at the same time, after the preassembled body is properly welded to the inside of the cylinder 4, the flange hole is then processed on the side wall of the cylinder 4, which avoids the extrusion deformation of the cylinder 4 and eliminates the vibration of the cylinder 4 during processing, which can effectively ensure the processing accuracy of the flange hole on the side wall of the cylinder 4.

[0146] In addition, on the basis of the pre-assembled body simultaneously supporting the bottom, middle and upper parts of the cylindrical body 4, the top flange 1 is welded to the cylindrical body 4, and the flange hole on the side wall of the cylindrical body 4 is processed with the help of marking and positioning on the side wall of the cylindrical body 4. This can ensure that the rigidity of the cylindrical body 4 meets the processing requirements during the processing, and no vibration or deformation occurs during the processing.

[0147] Example 2

[0148] In the prior art, each segmented flange is welded to the cylindrical body one by one. This welding method, in practice, fails to meet the required height and distance between the segmented flanges after assembly. It is also difficult to accurately control the arc distance between adjacent segmented flanges and the resulting position angle. Furthermore, the segmented flanges are severely deformed after welding. Therefore, this embodiment addresses the difficulties in accurately assembling the segmented flanges in terms of height, position, and angle, as well as the proneness to welding deformation of the segmented flanges and other components.

[0149] The product requirements for the fixed housing require high dimensional accuracy for the distance H1 between the upper plane of each segmented flange 3 and the upper plane of the positioning flange 5, as well as the distance H2 between the upper plane of each segmented flange 3 and the upper plane of the top flange 1, to ensure accurate positioning for subsequent component installation. Furthermore, the segmented flange 3 is provided with multiple threaded holes 33, arranged in a circular array centered around the central axis of the fixed housing. The product has strict positioning requirements for the distribution circle within which the threaded holes 33 are located, as well as their diameter. Furthermore, the upper surface of the segmented flange 3 must be highly flat, and a minimum thickness D1 of the segmented flange 3 must be maintained.

[0150] During the actual processing of the fixed box, the horizontal distance S1 between the threaded hole 33 of the segmented flange 3 and the inner edge of the side wall flange 2 is relatively close. At the same time, the horizontal distance S2 between the first assembly hole 51 of the positioning flange 5 and the inner edge of the segmented flange 3 is relatively close. If drilling is performed after the components are welded, there will be spatial interference between the processing equipment and the inner edge of the corresponding components, and drilling will be impossible. If the segmented flange 3 and the positioning flange 5 are drilled in advance and then welded, it is easy for the hole body to deform during the welding process, which will not only make it impossible to assemble the auxiliary device for manufacturing and ensure the yield of the fixed box, affecting the production of the product, but also bring inconvenience to the installation of subsequent parts and affect the accuracy of the subsequent part installation. That is, the problem faced by this hole body setting, such as the difficulty of drilling after welding or the deformation of the hole body during welding, is also one of the problems to be solved by this embodiment.

[0151] Next, this embodiment introduces the inventive concept in this embodiment based on the embodiment 1.

[0152] In order to understand the above size limitations, please refer to the attached Figure 5 This application uses a certain type of fixed enclosure as an example, but is not limited to this. This type of fixed enclosure has a total height of 1400mm, a diameter of 2400mm for the bottom flange 6, and a diameter of 2000mm for the top flange 1. H2 is 550mm high, H1 is 450mm high, S1 is 25mm, and S2 is 30mm. The flatness requirement for the upper surface of the segmented flange 3 is ≤0.15mm, and the thickness D1 is ≥40mm. The tolerances for H1 and H2 are both ±0.1mm.

[0153] The positioning flange 5 is provided with a first assembly hole 51. The distance between the first assembly hole 51 and the upper surface of the top flange 1 (i.e., the depth position of the first assembly hole 51) is H1+H2. This depth dimension is relatively large and belongs to a deep-size drilling hole. If the holes are drilled after the various components are connected, using a conventional extended drill rod will face difficulties such as the drill rod length being too long and the drill rod diameter being greater than S2, resulting in spatial interference. In addition, the overall stiffness of the drill rod is difficult to meet the requirements. As a result, the first assembly hole 51 is often unable to be processed after the various components of the product are welded.

[0154] To this end, the present application separately processes the first assembly hole 51 that meets the requirements after the positioning flange 5 is machined and formed, and before assembly, the positioning flange 5 is "drilled first, assembled later". Compared with the positioning flange 5 without drilling and then drilling after assembly, this avoids the problems of deep-sized drilling and spatial interference. In addition, a groove 52 is provided on the outer edge of the upper surface of the positioning flange 5. The processing process of the groove 52 can be placed in the forging process of the positioning flange 5 in Example 1, directly forged and formed, or additional groove processing can be performed during the rough machining process of the positioning flange 5. The provision of the groove 52 optimizes the structure of the first assembly hole 51. During the welding process of the positioning flange 5 to the inner wall of the cylindrical body 4, the original welding heat-affected zone can be effectively reduced by making the weld seam and the drilling processing surface not at the same plane height, thereby reducing the welding thermal stress at the first assembly hole 51, reducing the influence of the welding heat-affected zone on the first assembly hole 51, and avoiding the deformation of the first assembly hole 51 during the "drilling first, welding later" process.

[0155] On this basis, the first assembly hole 51 serves as the fixing point of the manufacturing auxiliary device at the lowest level. Whether the first assembly hole 51 is deformed directly determines key issues such as whether the manufacturing auxiliary device can be normally assembled according to the design requirements and whether the segmented flange 3 can be normally assembled and processed according to the design dimensions. This also determines the final product quality and yield rate of the fixed box product. To this end, the structural improvement of the positioning flange 5 in this embodiment, on the basis of avoiding the deformation of the first assembly hole 51 during the "drilling first, welding later" process, is also based on considerations for the subsequent assembly of the manufacturing auxiliary device and the assembly and processing of the segmented flange 3. It is conducive to ensuring the precise assembly of the subsequent manufacturing auxiliary device, and also ensures the assembly accuracy and connection position accuracy of the remaining upper-level components such as the segmented flange 3 to meet the design requirements; at the same time, it is also conducive to improving the final product quality and yield rate of the box product to a large extent.

[0156] For the threaded hole 33 of the segmented flange 3, due to the relatively small size of the segmented flange 3, the welding heat-affected zone will have a great deformation effect on the threaded hole 33. At the same time, due to the processing thickness requirements of the segmented flange 3, the segmented flange 3 cannot reduce the deformation effect of the welding heat-affected zone on the threaded hole 33 by changing the structural form of the welding point. Therefore, the threaded hole 33 of the segmented flange 3 cannot be manufactured using the "drilling first, then welding" method.

[0157] The threaded hole 33 is located at a distance H2 from the upper surface of the top flange 1, representing a medium-depth drill hole. The drilling difficulty is relatively low, and the segmented flange 3 can be directly drilled according to step S27 of the manufacturing method in Example 1. In this embodiment, after welding the segmented flange preform 8 to the inner wall of the cylindrical body 4 (steps S19 and S20 in Example 1) and cutting the segmented flange preform 8 (step S23 in Example 1), a CNC gantry boring machine with an extended drill rod is used in step S27 to machine the threaded hole 33 in each segmented flange 3 one by one. In other words, the threaded holes 33 in the segmented flange 3 are machined using a "weld first, then drilled" method, completely eliminating the possibility of hole deformation due to welding.

[0158] However, when the segmented flange 3 is "welded first and then drilled," drilling will apply a downward force to the segmented flange 3, inevitably causing deformation of the segmented flange 3 and affecting the actual dimensions related to the segmented flange 3, such as H1, H2, and the flatness of the upper surface of the segmented flange 3. This will lead to deviations in the structural dimensions at the final stage of the fixed box processing and forming, increasing the risk of unqualified product precision measurements, which is undoubtedly not conducive to improving the yield of the final product. At the same time, for the segmented flange 3 that has been cut into separate parts, once drilling deformation occurs, it will also be difficult to adjust and correct multiple segmented flanges 3 simultaneously.

[0159] To this end, this embodiment continues to improve on the basis of embodiment 1, and the fixed box body includes a support rib 7, and the support rib 7 is arranged below the segmented flange 3. One end of the support rib 7 is connected to the inner wall of the cylinder 4, and the other end is connected to the lower side of the segmented flange 3.

[0160] Therefore, by setting the support ribs 7, on the one hand, a support effect in the vertical direction is provided for the segmented flange 3 to offset the downward force applied to the segmented flange 3 by the drilling, thereby preventing the segmented flange 3 from being deformed due to the drilling; on the other hand, the cutting force to which the segmented flange prefabricated part 8 is subsequently subjected during the cutting process can also be offset by the connecting effect of the support ribs 7, thereby preventing the segmented flange 3 from being deformed due to the cutting segmentation. At the same time, when the segmented flange prefabricated part 8 (integral structure) is cut and separated into each segmented flange 3 (split structure), the deformation of the plate body is the largest due to the destruction of the connection relationship in the plate body by cutting. The setting of the support ribs 7 can also effectively reduce and limit the plate deformation of each segmented flange 3 caused by the destruction of the plate body by cutting. body deformation; thirdly, during the welding process of the segmented flange prefabricated part 8 and the inner wall of the cylinder 4, the support ribs 7 respectively connect the segmented flange prefabricated part 8 and the inner wall of the cylinder 4, providing a certain pulling effect for the welding deformation that may occur between the segmented flange prefabricated part 8 and the cylinder 4. To a certain extent, it can effectively reduce the welding deformation that may occur between the segmented flange prefabricated part 8 and the cylinder 4, which is conducive to ensuring that the actual dimensions of the two meet the design requirements, especially avoiding the segmented flange prefabricated part 8 from warping during the welding process, ensuring that the segmented flange 3 can finally meet the requirements of H1, H2, plate flatness, etc., so that the segmented flange 3 can be accurately installed in height, position and angle, avoiding welding deformation of the segmented flange 3. At the same time, while effectively preventing the segmented flange 3 from deformation, the support ribs 7 are also conducive to ensuring the final plate flatness of the segmented flange 3.

[0161] As for the assembly of the support ribs 7, the manufacturing method in Example 1 is also used as the basis. In step S20 of Example 1, specifically, after the second tooling 10 is disassembled and removed, the support ribs 7 are welded to the lower surface of the segmented flange preform 8 and the inner wall of the cylinder 4 according to the drawings. Then, the outer edge of the lower surface of the segmented flange preform 8, the third flange 23, and the fourth flange 24 are welded to the inner wall of the cylinder 4 respectively to ensure that the weld size and quality meet the requirements. It should be noted that, taking the two-segmented flange 3 as an example, the support ribs 7 should be welded to the lower surface of the flange first body 81 or the lower surface of the flange second body 82 in the segmented flange preform 8. The remaining structure of the segmented flange preform 8 will be cut off later. For this reason, it is necessary to weld on the lower surface of the flange segment body of the segmented flange preform 8.

[0162] The support rib 7 is provided with a weld avoidance opening 71, and the weld avoidance opening 71 is located at the connection between the segmented flange preform 8 and the inner wall of the cylinder 4. By providing the weld avoidance opening 71, a certain space is left for welding between the lower surface of the segmented flange preform 8 and the inner wall of the cylinder 4, which facilitates the welding operation and ensures that the lower surface of the segmented flange preform 8 and the inner wall of the cylinder 4 are completely welded in the circumferential direction.

[0163] In addition, in order to strictly ensure the height requirement of the segmented flange 3, this embodiment also restricts the dimensions of the segmented flange prefabricated part 8 and the segmented flange 3.

[0164] After all finishing operations are completed, the thickness D1 of the segmented flange 3 (which can also be understood as the segmented flange 3 in the finished fixed housing) should be ≥ 40mm. At the same time, subject to the overall height of the fixed housing, H1, H2, and the installation space limitations of other equipment within the finished fixed housing, the maximum thickness of the segmented flange 3 in the finished fixed housing should be controlled within 50mm, that is, D1 should be within the range of 40mm-50mm. To this end, the segmented flange prefabricated component 8 in this embodiment is designed to have a maximum thickness of approximately 50mm during the rough machining process before assembly.

[0165] The notch 83 formed on the outer edge of the segmented flange preform 8 in Example 1 can effectively prevent the grinding wheel from cutting into the inner wall of the cylinder 4 during the subsequent cutting process into the segmented flange 3, and can also prevent interference during subsequent grinding. It can also ensure that when the flange hole is processed on the side wall of the cylinder 4, the equipment for processing the flange hole will not interfere with the segmented flange preform 8.

[0166] In addition, the annealing treatment in step S24 of Example 1 can also ensure that the welding internal stress of the segmented flange prefabricated part 8 is reduced to a minimum value, thereby avoiding subsequent deformation under the action of the welding internal stress.

[0167] Regarding the product requirements of H1, H2, and D1 related to the segmented flange 3, this application mainly uses manufacturing auxiliary devices to assist in height adjustment, especially through the assembly between the positioning flange 5, the first tooling 9, the second tooling 10, and the segmented flange prefabricated part 8.

[0168] As attached Figure 11 , Attachment Figure 15 As shown, for the second tool 10, the distance X2 between the lower surface of the first upper plate 102 and the lower end surface of the support cylinder 101 is used as a reference. First, in step S3 of embodiment 1, step S3 includes:

[0169] S31. With the lower surface of the first lower plate 103 of the second tooling 10 facing downward, the second assembly component is hoisted above the first assembly component. The inner edge of the first lower plate 103 is positioned and engaged with the retaining ring groove 93 on the upper surface of the first tooling 9. The second tooling 10 and the first tooling 9 are connected and fixed using fasteners, so that the first assembly component and the second assembly component are connected to form a third assembly component.

[0170] S32. Measure the distance X1 between the upper surface of the positioning flange 5 and the lower surface of the segmented flange preform 8 in the second assembly component. Based on the final required distance H1 between the upper plane of the segmented flange 3 and the upper plane of the positioning flange 5, the final required minimum thickness D1 of the segmented flange 3, the actual machining allowance of the upper surface of the positioning flange 5, and the actual thickness allowance of the segmented flange 3, you can also continue to refer to the welding deformation shrinkage to determine the distance X2 between the lower surface of the first upper plate 102 of the second tooling 10 and the lower end face of the support tube 101 of the second tooling 10, so that X2 can ensure that the allowances of D1 and H1 are sufficient. Among them, as long as the conditions such as subsequent processing are met and the allowances of D1 and H1 are sufficient and can meet product requirements are met, X2 can actually take any value within a numerical range that meets the above conditions, rather than a fixed value. That is, X2 is theoretically a numerical range that meets the conditions, but in actual operation, the actual value of X2 is a specific value within the range value to facilitate subsequent processing.

[0171] S33. Remove the fasteners connecting the second tooling 10 and the first tooling 9, and perform secondary processing on the lower side surface of the second tooling 10 (including the lower end surface of the support tube 101 and the lower surface of the first lower plate 103) so that the distance between the lower surface of the first upper plate 102 of the second tooling 10 and the lower end surface of the support tube 101 of the second tooling 10 is X2 determined in step S32, and then reconnect the first assembly component and the second assembly component according to the assembly method of step S31 to form a second assembly component.

[0172] Thus, through the processing process of steps S31-S33, the relative height of the segmented flange prefabricated part 8 is specifically limited and fixed by using the second tooling 10 and the first tooling 9, so that in the second assembly component after the final assembly, D1 and H1 have sufficient margins, providing dimensional margins for subsequent fine processing (step S24), and the product requirements of the fixed box can be met through simple processing.

[0173] Correspondingly, step S24 is a finishing process, which also determines whether the components such as the segmented flange 3 meet the product requirements of H1, H2, and D1. Specifically, step S24 includes:

[0174] S241. Check the flatness of the surface on each segmented flange 3;

[0175] S242. Use CNC vertical lathe to take the upper surface and inner hole of the positioning flange 5 as the reference, and take into account the upper plane and outer circle allowance of the top flange 1, as well as the lower plane and outer circle allowance of the bottom flange 6, to fine-machine the upper plane of the positioning flange 5 and the inner hole size of the positioning flange 5. After completion, turn over the fixed box middle piece with the lower plane of the bottom flange 6 facing upward, and fine-machine the lower plane and outer circle size of the bottom flange 6; after completion, turn over the fixed box middle piece again with the upper plane of the top flange 1 facing upward, and fine-machine the upper plane of the segmented flange 3, while ensuring the product requirements of H1 and D1, and fine-machine the inner circle of the segmented flange 3; machine the upper plane of the top flange 1, first ensuring the product requirement of H2, and then ensuring the total height of the fixed box, and after completion, fine-machine the inner hole of the top flange 1.

[0176] Based on the sufficient margins reserved for D1 and H1 in step S3, and the preset processing margins for components such as the bottom flange 6 and the top flange 1, after checking the flatness of the segmented flange 3, the relevant components can be fine-processed in sequence according to step S242, so that the fixed box after fine-processing meets the product requirements of H1, D1, H2, etc., and the segmented flange has a higher installation accuracy in height, position angle, and plate horizontality.

[0177] In this application, through the introduction of Example 1 and Example 2, it can be seen that: this application proposes a manufacturing process method based on the combination of structural optimization and welding auxiliary tooling according to the structural characteristics of the fixed box. The main body of this method uses the method of building blocks of parts to improve the stiffness of thin-walled areas that are prone to deformation during welding and vibration during processing. At the same time, considering the overall and local deformation simultaneously, a systematic manufacturing process path is proposed. While reducing the requirements for the manufacturer's experience level and labor intensity, the positioning accuracy and efficiency in the box manufacturing process are improved, and the deformation during the welding process is controllable. The quality of the overall manufacturing process is stable and reliable, and while reducing the product manufacturing cost, the qualified rate of the final product can be effectively improved.

[0178] The large thin-walled box products involved in this application are not limited to the fixed box of the straight-wing propeller propeller. The auxiliary manufacturing devices and manufacturing methods proposed in this application are also applicable to the rotating body welded box (or tube body, shell).

[0179] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An auxiliary device for manufacturing large thin-walled box products, characterized in that: The large thin-wall box product comprises a top flange (1), a side wall flange (2), a segmented flange (3), a cylinder (4), a positioning flange (5), and a bottom flange (6); the segmented flange (3) is processed from a segmented flange prefabricated part (8); the manufacturing auxiliary device comprises a first tool (9), a second tool (10), and a third tool (11); the first tool (9) is connected to the upper surface of the positioning flange (5) in a detachable manner, the lower surface of the second tool (10) is connected to the upper surface of the first tool (9) in a detachable manner, the segmented flange prefabricated part (8) is connected to the second tool (10) in a detachable manner, and the lower surface of the third tool (11) is connected to the upper surface of the segmented flange prefabricated part (8) in a detachable manner; the outer edge of the positioning flange (5), the outer edge of the segmented flange prefabricated part (8), and the third tool (11) are all in contact with the inner wall of the cylinder (4).

2. The auxiliary device for manufacturing large thin-walled box products according to claim 1, characterized in that: The upper surface of the positioning flange (5) is provided with a first assembly hole (51) and an assembly groove (53); the first tooling (9) is provided with a fourth assembly hole (94); the first assembly hole (51) and the fourth assembly hole (94) are connected by a fastener; the lower surface of the first tooling (9) is provided with a limiting boss (92); the limiting boss (92) can be engaged with the assembly groove (53) for limiting position.

3. The auxiliary device for manufacturing large thin-walled box products according to claim 1, characterized in that: The segmented flange preform (8) is a circular plate body, and at least two notches (83) are provided on the outer edge of the segmented flange preform (8), so that the outer edge of the segmented flange preform (8) is divided into at least two sections.

4. The auxiliary device for manufacturing large thin-walled box products according to claim 1, characterized in that: The segmented flange preform (8) is provided with a second assembly hole (85), the second tooling (10) includes a support tube (101), the segmented flange preform (8) can be surrounded by the outer space of the support tube (101), the upper end outer wall of the support tube (101) is provided with a first upper plate (102), the first upper plate (102) is provided with a seventh assembly hole (106), the lower surface of the first upper plate (102) is fitted with the upper surface of the segmented flange preform (8), and the second assembly hole (85) and the seventh assembly hole (106) are connected by fasteners.

5. The auxiliary device for manufacturing large thin-walled box products according to claim 4, characterized in that: A limiting step (1021) is provided on the lower surface of the first upper plate (102), and the limiting step (1021) can be engaged with the inner edge of the segmented flange prefabricated component (8) for limiting position.

6. The auxiliary device for manufacturing large thin-walled box products according to claim 4, characterized in that: A first lower plate (103) is provided on the inner wall of the lower end of the support tube (101), a sixth assembly hole (105) is provided on the first lower plate (103), a fifth assembly hole (95) is provided on the upper surface of the first tooling (9), the lower surface of the first lower plate (103) is fitted with the upper surface of the first tooling (9), and the fifth assembly hole (95) and the sixth assembly hole (105) are connected by fasteners.

7. The auxiliary device for manufacturing large thin-walled box products according to claim 6, characterized in that: A limiting ring groove (93) is provided on the upper surface of the first tooling (9), and the fifth assembly hole (95) is located in the limiting ring groove (93). The lower end surface of the support cylinder (101) and the lower surface of the first lower plate (103) are both in contact with the bottom of the limiting ring groove (93). The first lower plate (103) is a circular plate body, and the inner edge of the first lower plate (103) is clamped and limited with the inner side of the limiting ring groove (93).

8. The auxiliary device for manufacturing large thin-walled box products according to claim 7, characterized in that: The segmented flange preform (8) is provided with a third assembly hole (86), the third tooling (11) includes a support tube (111), the inner wall of the lower end of the support tube (111) is provided with a second lower plate (113), the second lower plate (113) is provided with an eighth assembly hole (115), the lower end surface of the support tube (111) and the lower surface of the second lower plate (113) are both fitted with the upper surface of the segmented flange preform (8), and the third assembly hole (86) and the eighth assembly hole (115) are connected by fasteners; the second lower plate (113) is a circular plate body, and the inner edge of the second lower plate (113) is clamped and limited with the outer edge of the first upper plate (102) of the second tooling (10).

9. The auxiliary device for manufacturing large thin-walled box products according to claim 8, characterized in that: A second upper plate (112) is provided on the upper end surface of the support tube (111), and the outer edge of the second upper plate (112) abuts against the inner wall of the cylindrical body (4).

10. A method for manufacturing large thin-walled box products, characterized in that: The manufacturing method uses the auxiliary device for manufacturing large thin-walled box-type products according to any one of claims 1 to 9, wherein the side wall flange (2) comprises at least a first flange (21), a second flange (22), a third flange (23), and a fourth flange (24); the manufacturing method comprises: S1. Place the positioning flange (5) on the assembly platform, assemble the first tooling (9) to the upper plane of the positioning flange (5), and connect and fix the first tooling (9) and the positioning flange (5) with fasteners to form a first assembly component; S2. Place the second tooling (10) on the assembly platform with the upper surface of the first upper plate (102) of the second tooling (10) facing downward, sleeve the segmented flange prefabricated component (8) onto the outer side of the support cylinder (101) of the second tooling (10), abut the inner edge of the segmented flange prefabricated component (8) against the limiting step (1021) of the first upper plate (102), and connect and fix the segmented flange prefabricated component (8) and the second tooling (10) with fasteners to form a second assembly component; S3, with the lower surface of the first lower plate (103) of the second tooling (10) facing downward, the second assembly component is hoisted above the first assembly component, the inner edge of the first lower plate (103) is positioned and clamped with the limiting ring groove (93) on the upper surface of the first tooling (9), and the second tooling (10) and the first tooling (9) are connected and fixed by fasteners, so that the first assembly component is connected to the second assembly component to form a third assembly component; S4. Using the outer circumference of the positioning flange (5) as a processing reference, perform secondary processing on the outer circumference of the segmented flange preform (8), so that the outer circumference diameter φM of the segmented flange preform (8) is equal to the outer circumference diameter φN of the positioning flange (5), thereby ensuring the concentricity of the positioning flange (5) and the segmented flange preform (8) during the assembly process with the cylindrical body (4); S5, placing the bottom flange (6) on the assembly platform, marking the outer circle line of the positioning flange and the outer circle line of the cylinder on the upper surface of the bottom flange (6), assembling the second assembly component with the bottom flange (6) in a manner that the positioning flange (5) faces downward, and positioning and assembling the stop step at the bottom of the positioning flange (5) with the center hole step of the bottom flange (6); S6. Insert the cylindrical body (4) from above the second assembly component so that the cylindrical body (4) is sleeved on the outside of the second assembly component, and fit the lower end surface of the cylindrical body (4) to the upper surface of the bottom flange (6); S7, spot welding the contact points between the inner wall of the cylinder (4) and the outer edge of the segmented flange prefabricated part (8); S8, hoist the third tooling (11) from the upper end of the cylinder (4) into the cylinder (4), place the third tooling (11) above the segmented flange preform (8), position and snap-fit ​​the inner edge of the second lower plate (113) of the third tooling (11) with the outer edge of the first upper plate (102) of the second tooling (10), fit the lower side of the third tooling (11) with the upper surface of the segmented flange preform (8), connect and fix the third tooling (11) and the segmented flange preform (8) with fasteners, so that the third tooling (11) is connected to the third assembly component; S9, the third tool (11), the third assembly component, and the cylindrical body (4) are recorded as the fourth assembly component, and the fourth assembly component is hoisted by the lifting lug structure of the third tool (11), and the fourth assembly component is hoisted as a whole and separated from the bottom flange (6); S10, turning over the fourth assembly component with the bottom surface of the positioning flange (5) facing upward, and placing it on the assembly platform, and welding the weld between the positioning flange (5) and the cylindrical body (4); S11, processing the upper end surface of the cylindrical body (4) based on the bottom surface and the inner circular surface of the positioning flange (5); S12, aligning the top flange (1) with the upper end surface of the cylindrical body (4) so ​​that the concentricity of the top flange (1) and the inner circle of the cylindrical body (4) is ≤0.2 mm, and then welding the top flange (1) to the upper end surface of the cylindrical body (4); S13, using the position of the notch (83) of the segmented flange prefabricated component (8) and the lower end surface of the cylinder (4) as a reference, marking the positioning center position of each side wall flange (2) on the side wall of the cylinder (4); S14, based on the positioning center position marked in step S13, boring the side wall of the cylinder (4) by a CNC boring and milling machine to machine various side wall flange holes; S15, assembling the fourth assembly component processed in step S14 with the bottom flange (6) with the positioning flange (5) facing downward, so that the stop step at the bottom of the positioning flange (5) is positioned and assembled with the center hole step of the bottom flange (6), thereby forming a fifth assembly component; S16, welding the cylindrical body (4) to the bottom flange (6), then turning the fifth assembly component over as a whole with the lower surface of the bottom flange (6) facing upward, and welding the weld between the positioning flange (5) and the inner hole of the bottom flange (6); S17, insert the first flange (21), the second flange (22), the third flange (23), and the fourth flange (24) into the corresponding side wall flange holes of the cylindrical body (4), spot weld each side wall flange (2) to the cylindrical body (4), then weld the first flange (21), the second flange (22), the third flange (23), and the fourth flange (24) to the outer wall of the cylindrical body (4), and weld the first flange (21) and the second flange (22) to the top flange (1). S18, disassembling and removing the third tool (11) from the fifth assembly component, and welding the first flange (21) and the second flange (22) to the inner wall of the cylindrical body (4) respectively; S19, welding the outer edge of the upper surface of the segmented flange prefabricated part (8) to the inner wall of the cylindrical body (4); S20, dismantling and removing the second tooling (10), and welding the outer edge of the lower surface of the segmented flange preform (8), the third flange (23), and the fourth flange (24) to the inner wall of the cylindrical body (4); S21. Weld the outer edge of the upper surface of the positioning flange (5) to the inner wall of the cylindrical body (4), and then disassemble and remove the first tooling (9) to obtain a product intermediate.

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