A method for manufacturing and installing a semi-suspended twisted rudder blade for a ship

Abstract

The present invention provides a method for manufacturing and installing a semi-suspended twisted rudder blade for a ship, comprising the following steps: S1. designing and drawing a rudder blade structural drawing; S2. pre-assembling the longitudinal and transverse gratings inside the rudder blade in an infield, installing each horizontal rib plate with the rudder blade internal grating as the base surface to form two independent grating assembly components; S3. manufacturing a rudder blade cladding frame template and a rudder blade cladding; S4. positioning the cladding on one side of the rudder blade; S5. marking a cladding positioning line on the cladding; S6. positioning and installing the grating assembly component; S7. installing a rudder stock bearing seat and a rudder pin bearing seat, and then welding the grating assembly component to the cladding; S8. installing the cladding on the other side of the rudder blade; S9. stress-relieving the outer surface of the rudder blade; S10. closing and installing the rudder blade. The method for manufacturing and installing a semi-suspended twisted rudder blade of the present invention can effectively reduce the difficulty of manufacturing the rudder blade, improve its own manufacturing accuracy, and also improve the accuracy benchmark of the rudder stock positioning and installation during closing, thereby avoiding the comprehensive cost of subsequent modifications.

Description

Technical Field

[0001] The invention belongs to the technical field of hull outfitting, and in particular relates to a method for manufacturing and installing a semi-suspended twisted rudder blade of a ship. Background Art

[0002] Rudder blades come in many different styles, including fully-mounted and semi-mounted. Rudder blades primarily provide steering during navigation, while semi-mounted flap rudders reduce loads on the rudder shaft and steering gear system, improving navigation. Semi-mounted twisted flap rudders significantly reduce tail cavitation, improving navigation. While typical rudder blades have a uniform teardrop-shaped horizontal cross-section at the top, middle, and bottom, semi-mounted twisted flap rudders have an asymmetrical teardrop-shaped cross-section. The top section is uniform, while the lower section is asymmetrical. This, combined with the structure and plating characteristics of semi-mounted twisted flap rudders, makes them extremely difficult to construct. Furthermore, the rudder blade's internal space is confined, making operation difficult. Substandard line shapes can lead to rudder blade sheathing replacement and deviations in the rudder stock centerline of the steel castings for the rudder stock seat and pintle, resulting in deviations in the rudder stock centerline during installation, significantly delaying ship delivery. Summary of the Invention

[0003] In response to the above problems, the present invention provides a method for manufacturing and installing a semi-suspended twisted rudder blade for a ship. This method can effectively reduce the construction difficulty of the rudder blade, improve its own construction accuracy, and also improve the accuracy benchmark of the rudder shaft positioning and installation during closure, thereby avoiding the comprehensive cost of subsequent modifications.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for manufacturing and installing a semi-suspended twisted rudder blade for a ship, comprising the following steps:

[0006] S1. Design and draw drawings of the rudder blade structure, tire frame templates, component assembly line drawings, and plate positioning drawings. Perform design on the weld nodes and annotate the weld groove, groove angle, and groove gap information on the drawings.

[0007] S2. Pre-assemble the longitudinal and transverse gratings within the rudder blade in the inner field. Using the internal gratings as the base, install the horizontal ribs to form two independent grating assemblies.

[0008] S3 production of rudder blade plate tire frame template and rudder blade plate;

[0009] S4. Position the rudder blade side plate;

[0010] S5. Mark the board positioning line on the board;

[0011] S6. Positioning and installation of grid assembly components;

[0012] S7. Electric weld the two grating assembly components to the cladding plate, then install the rudder stock bearing steel castings and the rudder pintle bearing steel castings. Use the corner joints of the grating plate and cladding plate to monitor the center of the rudder hole in the steel castings for deviation.

[0013] S8. Install the cladding on the other side of the rudder blade;

[0014] S9. Perform stress relief on the outer surface of the rudder blade;

[0015] S10. Fold and install the rudder blades.

[0016] Furthermore, the welding nodes include the welding nodes between two adjacent single rudder blade cladding plates on the port side, the welding nodes between two adjacent single rudder blade cladding plates on the starboard side, the welding nodes between the starboard side cladding plate and the longitudinal and transverse bulkheads inside the twisted rudder blade, the welding nodes between a rib in the rudder stock bearing steel casting and the pintle bearing steel casting and the longitudinal bulkhead inside the rudder blade, the welding nodes between the rudder stock bearing steel casting and the rudder blade top plate, the welding nodes between the pintle bearing steel casting and the horizontal bulkhead inside the rudder blade, and the welding nodes between the rudder stock bearing steel casting and the pintle bearing steel casting and the horizontal bulkhead inside the rudder blade; wherein, a V-shaped groove is used between two adjacent single rudder blade cladding plates on the port side, the groove spacing is kept at 6±2mm, and the groove angle is 35°, plug welding is adopted between the starboard side cladding and the longitudinal and transverse bulkheads inside the twisted rudder blade, V-shaped grooves are adopted between the rudder stock bearing steel casting and a rib in the rudder pintle bearing steel casting and the longitudinal bulkhead inside the rudder blade, the groove spacing is retained at 2±2mm, the groove angle is 45°, V-shaped grooves are adopted between the rudder stock bearing steel casting and the rudder pintle bearing steel casting and the horizontal bulkhead inside the rudder blade, the groove spacing is retained at 2±2mm, the groove angle is 45°, V-shaped grooves are adopted between the rudder stock bearing steel casting and the rudder pintle bearing steel casting and the horizontal bulkhead inside the rudder blade, the groove spacing is retained at 2±2mm, the groove angle is 45°, V-shaped grooves are adopted between two adjacent single rudder blade cladding plates on the starboard side, the groove spacing is retained at 6±2mm, the groove angle is 45°.

[0017] Furthermore, the step S3 is specifically to mark out each tire frame position line on a rigid platform, install each tire frame template along the line on each tire frame position line, weld each tire frame template to the rigid platform, and use a total station to measure the three measuring points located at the head, middle and tail of the tire frame template on each tire frame template; divide the port side cladding of the rudder blade into several blocks, and use external force to use cold pressing equipment to make the cladding by cold processing methods such as bending, rolling and point pressing. After the uneven teardrop-shaped cladding is completed, it is used to perform a prototype detection to ensure that it fits the template after processing; all the formed claddings are hoisted to the tire frame template to detect whether the formed claddings match the tire frame template.

[0018] Furthermore, the step S4 is specifically to lift the wrapping plate on one side of the rudder blade to the wrapping plate frame template, position the wrapping plate according to the wrapping plate positioning diagram, and use the total station to measure the four corner positioning data of the wrapping plate and compare it with the model data. After the data is correct, the wrapping plate is welded to form the wrapping plate on one side of the entire rudder blade; the step S5 is specifically to draw the wrapping plate positioning line on the wrapping plate on one side of the entire rudder blade according to the component assembly marking diagram by using the powder line and the total station.

[0019] Furthermore, the step S6 specifically includes installing an assembly guide plate on either side of the panel wrapping positioning line, and sliding the grid panel assembly components along the guide plate to position the assembly guide plate.

[0020] Furthermore, step S7 further includes installing a cross target frame at the upper and lower openings of the rudder stock bearing seat and the rudder pintle bearing seat during positioning and installation of the rudder stock bearing seat and the rudder pintle bearing seat, passing a 0.3 mm steel wire through the center points of the upper and lower cross target frames, and measuring with a total station whether the steel wire is in the center of the cross target frame; and after the rudder blade grid plate is assembled and the cover plate is welded, measuring the positioning data of the rudder stock bearing seat and the rudder pintle bearing seat casting with the total station, and adjusting and controlling the centers of the rudder stock holes of the rudder stock bearing seat and the rudder pintle bearing seat casting to be aligned.

[0021] Furthermore, in step S7, the corner joints and butt welding sequence, the size of the weld angle, the groove gap, the groove size, and the groove angle information of the longitudinal and transverse grid plates and the rudder stock bearing and pintle bearing steel castings are indicated in conjunction with the rudder blade drawings. Pressure indicators of a control welding monitoring tool are installed on both sides of the position where the rudder stock bearing steel casting and the pintle bearing steel casting are installed to monitor whether the rudder stock centerline is offset when the rudder stock bearing and pintle bearing steel castings are connected to the internal structure at the corner joints.

[0022] Furthermore, step S8 is specifically to use a total station to re-measure the target point position data on the internal structure of the rudder blade after the rudder blade grid plate assembly components and the wrap plate pad are welded, and to perform simulation analysis with the coordinate data in the three-dimensional model, to trim the grid plates with data exceeding the standard, and to install the rudder blade wrap plate on the other side after all internal grid plate measurements meet the standard; during the installation of this side wrap plate, it is dispersed from the middle to both sides to reduce cumulative errors. After the installation is completed, the groove distance between the wrap plates is adjusted, and welding is performed, and the rudder blade is completed.

[0023] Furthermore, step S9 specifically involves performing stress relief on the outer surface of the rudder blade after the rudder blade is manufactured. Specifically, when the rudder blade is located on the tire frame template, a 300-350°C flame is used to perform preliminary stress relief on the grating positions on the outer surfaces of both sides of the rudder blade. Then, the rudder blade is hoisted to the ground and laid flat. Wooden blocks are used to level the lower part of the rudder blade to control the overall level of the rudder blade and ensure that the rudder stock hole is in a horizontal state. 8-12 points are selected on the rudder blade, stress monitoring target points are installed, and the stress relief instrument is turned on. The stress relief instrument is used to vibrate the cladding weld until the weld stress test is qualified.

[0024] Furthermore, step S10 specifically includes: after the rudder blade is inspected and sent for painting, it is transferred to the bottom of the rudder stock by the dock transfer platform vehicle, and the rudder blade is installed using the jacking device of the dock transfer platform vehicle. When the rudder stock is inserted into the rudder stock hole of the rudder stock bearing seat and the rudder pin bearing seat, the fitting clearance between them is ensured to be 0.05 mm.

[0025] During the design process of the aforementioned preliminary drawings, it is necessary to consider the space construction problems of the twisted flap rudder. The welding form, welding angle groove and other assembly issues in the drawings need to be considered in advance. According to the structural form of the drawings, when designing the welding form, the welding amount, welding parameters, welding wire deposition amount, welding deformation, construction environment and other considerations are compared, and the welding form is optimized. For example, the corner joint form of the grating and the wrapping plate is changed from a single-sided V-groove to a K-groove. The symmetrical welding of the K-groove can greatly reduce the deviation of the welding to one side. In addition, for the bulk wrapping plate on the right side, the original welding form was a butt form, which is now changed to a plug welding form. The deposition amount of welding wire is greatly reduced, the amount of welding materials is reduced, and the corresponding deformation is also reduced, which facilitates the continuity and reduces the precision problem in the subsequent production process.

[0026] For the problem of semi-suspended twisted flap rudder blades with large linear shapes and too little construction space, the longitudinal and transverse gratings inside the rudder blade are first pre-assembled in the inner field. The internal gratings of the rudder blade are used as the base surface, and the horizontal ribs are installed to form a grating assembly. This reduces the bulk of the internal components of the rudder blade on the tire frame, which facilitates construction and greatly reduces the amount of welding on the tire frame. Appropriately moving the process forward is beneficial to reducing welding deformation and welding stress concentration problems of the internal components of the rudder blade.

[0027] The method for manufacturing and installing a semi-suspended twisted rudder blade of the present invention is beneficial to improving the processing accuracy of thick plates of twisted rudder blades. In addition, this method can improve the assembly accuracy of twisted flap rudders, disperse the problem of concentrated welding inside the rudder blades, solve the problem of narrow space and difficult welding, and try to open up the narrow space to facilitate operation by construction personnel. Through this manufacturing method, the stress elimination method was tried for the first time, effectively reducing the cracking of welds due to excessive stress in later operations. Through the entire plate processing, tire frame template monitoring, cast steel auxiliary welding control, stress elimination and other operating methods, the manufacturing accuracy of this semi-suspended twisted flap rudder blade is greatly improved, and the effect of use is very good. The manufacturing accuracy is improved by 30% compared with the original rudder blade manufacturing accuracy. The time for installing the semi-suspended twisted flap rudder during closure is accelerated, and the efficiency is improved by 40%. It saves a lot of personnel costs and the comprehensive cost of subsequent modifications, and effectively opens up a new idea for rudder blade manufacturing.

[0028] The manufacturing method and installation method of the semi-suspended twisted flap rudder of the present invention provide a double-line and twisted linear processing method of the twisted rudder blade cover plate, and also provide a deformation control method and a stress elimination method during the manufacturing of the rudder blade, so that the precision of the twisted rudder blade after manufacturing is higher, the linear precision is improved from ±6mm to ±3mm, and the rudder stock is improved from ±4 to ±1, thereby avoiding the subsequent problem of rudder blade replacement or scrapping due to substandard precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the starboard side structure of the twisted rudder blade according to the present invention;

[0030] Figure 2 This is a schematic diagram of the twisted rudder blade port side structure according to the present invention;

[0031] Figure 3 for Figure 1 Middle AA direction view;

[0032] Figure 4 for Figure 1 Welded nodes A, B, C, and D, and Figure 3 Schematic diagram of the welding structure of the welding node E;

[0033] Figure 5 This is a line drawing of the rudder blade plate of the present invention;

[0034] Figure 6 It is a structural schematic diagram of two grating assembly components according to the present invention;

[0035] Figure 7 This is a schematic diagram of the rudder blade cradle template of the present invention;

[0036] Figure 8This is a schematic diagram of positioning the rudder blade wrapping plate according to the present invention;

[0037] Figure 9 This is a schematic diagram of the assembly of the internal components of the rudder blade according to the present invention;

[0038] Figure 10 This is a schematic diagram of the installation of the pressure pointer of the present invention;

[0039] Figure 11 This is a schematic diagram of positioning the steel casting according to the present invention;

[0040] Figure 12 Schematic diagram of the stress relief target stand of the present invention;

[0041] Figure 13 Schematic diagram of rudder blade installation and platform trolley described in the present invention.

[0042] Among them, 1-port rudder blade wrapping plate, 2-starboard rudder blade wrapping plate, 3-transverse grid plate, 4-rudder pintle bearing steel casting, 5-rudder stock bearing steel casting, 6-symmetrical teardrop rudder blade line, 7-unsymmetrical teardrop rudder blade line, 8-first grid plate assembly component, 9-second grid plate assembly component, 10-cradle, 11-rigid platform, 12-wrapping plate positioning line, 13-assembly guide plate, 14-pressure pointer, 15-supporting card plate, 16-stress monitoring target, 17-dock transfer platform vehicle, 18-jacking device, 19-longitudinal partition, 20-epoxy resin, 21-round tube, 22-panel, 23-plug welding hole. DETAILED DESCRIPTION

[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0044] like Figure 1-Figure 7 As shown, a method for manufacturing and installing a semi-suspended twisted rudder blade for a ship comprises the following steps:

[0045] S1. Design and draw drawings of the rudder blade structure, tire frame templates, component assembly line drawings, and plate positioning drawings. Perform design on the weld nodes and annotate the weld groove, groove angle, and groove gap information on the drawings.

[0046] S2. The longitudinal and transverse grid plates inside the rudder blade are pre-assembled in advance in the inner field. The rudder blade internal grid plate is used as the base surface, and each horizontal rib is installed to form two independent grid plate assembly components;

[0047] S3 production of rudder blade plate tire frame template and rudder blade plate;

[0048] S4. Position the rudder blade side plate;

[0049] S5. Mark the board positioning line on the board;

[0050] S6. Positioning and installation of grid assembly components;

[0051] S7. Electric weld the two grating assembly components to the cladding plate, then install the rudder stock bearing steel castings and the rudder pintle bearing steel castings. Use the corner joints of the grating plate and cladding plate to monitor the center of the rudder hole in the steel castings for deviation.

[0052] S8. Install the cladding on the other side of the rudder blade;

[0053] S9. Perform stress relief on the outer surface of the rudder blade;

[0054] S10. Fold and install the rudder blades.

[0055] The welding nodes include the welding nodes between two adjacent single port rudder blade cladding plates 1, the welding nodes between two adjacent single starboard rudder blade cladding plates 2, the welding nodes between the starboard rudder blade cladding plates 2 and the longitudinal and transverse bulkheads inside the twisted rudder blade, the welding nodes between the rudder stock bearing steel casting 5 and one of the ribs of the rudder pintle bearing steel casting 4 and the longitudinal bulkhead inside the rudder blade, the welding nodes between the rudder stock bearing steel casting 5 and the rudder blade top plate, the welding nodes between the rudder pintle bearing steel casting 4 and the transverse bulkhead inside the rudder blade, and the welding nodes between the rudder stock bearing steel casting 5 and the rudder pintle bearing steel casting 4 and the transverse bulkhead inside the rudder blade.

[0056] like Figure 3 As shown, welding node A is the welding node between a rib in the rudder stock bearing steel casting 5 or the pintle bearing steel casting 4 and the longitudinal partition inside the rudder blade, which adopts a V-shaped groove with a groove spacing of 2±2mm and a groove angle of 45°; welding node B is the welding node between the rudder stock bearing steel casting 5 and the horizontal partition at the top of the rudder blade, which adopts a V-shaped groove with a groove spacing of 2±2mm and a groove angle of 45°;

[0057] Welding node D is the welding node between the starboard rudder blade sheathing plate 2 and the internal longitudinal bulkhead of the twisted rudder blade, which adopts plug welding, and the plug welding hole is opened between the two outer plates; Welding node C is the welding node between the rudder stock bearing steel casting 5 or the rudder pintle bearing steel casting 4 and the internal horizontal bulkhead of the rudder blade, which adopts V-shaped groove, with the groove spacing retained at 2±2mm and the groove angle at 45°; Welding node E is the welding node between two adjacent single starboard rudder blade sheathing plates 2, which adopts V-shaped groove, with the groove spacing retained at 6±2mm and the groove angle at 45°.

[0058] In addition, a V-shaped groove is used between two adjacent single-piece port rudder blade cladding plates, the groove spacing is maintained at 6±2mm, and the groove angle is 35°.

[0059] The step S3 specifically includes marking each tire frame position line on a rigid platform, installing each tire frame template along the line on each tire frame position line, welding each tire frame template to the rigid platform, and measuring three measuring points located at the head, middle and tail of each tire frame template using a total station; dividing the port side cladding of the rudder blade into 16 pieces, and using external force to use cold pressing equipment to cold-process the plate by bending, rolling and point pressing. After the uneven teardrop-shaped cladding is processed, it is used to perform a template detection to ensure that it fits the template after processing; all the formed claddings are hoisted to the tire frame template to detect whether the formed claddings match the tire frame template.

[0060] like Figure 8 As shown in the figure, the 16 panels on one side of the rudder blade are hoisted onto the panel frame respectively. According to the panel positioning diagram, the panels are positioned from the middle to both sides. The four corner positioning data of the panels are measured by a total station and compared with the model data. After the data are correct, the panels are welded to form the entire panel on one side of the rudder blade.

[0061] like Figure 9 As shown, the step S5 is specifically to mark the plate positioning line on the plate on one side of the entire rudder blade formed according to the component assembly marking drawing by using chalk line and total station; the step S6 is specifically to install the assembly guide plate on either side of the plate positioning line. First of all, the principle is to facilitate the installation of the assembly guide plate, and it should not hinder the subsequent assembly and installation. At the position of the assembly guide plate, the grid assembly component is slid along the guide plate to be positioned; the assembly guide plate refers to a clamping plate installed on the inner surface of the rudder blade, but one side of the clamping plate is made into an inclined surface to facilitate assembly and installation, and to play a guiding role in the assembly structure.

[0062] like Figure 11 As shown, step S7 also includes installing a "cross" target frame at the upper and lower positions of the rudder stock bearing seat and the rudder pintle bearing seat when positioning and installing the rudder stock bearing seat steel casting 5 and the rudder pintle bearing seat steel casting 4, passing a 0.3mm steel wire through the center points of the upper and lower "cross" target frames, and using a total station to measure whether the steel wire is in the center of the "cross" target frame, so as to monitor the welding deformation of the steel castings during the subsequent welding; after the rudder blade grid plate is assembled and the plate is welded, the total station is used to measure the positioning data of the rudder stock bearing seat steel casting 5 and the rudder pintle bearing seat steel casting 4, and adjust the rudder stock hole centers of the rudder stock bearing seat steel casting 5 and the rudder pintle bearing seat steel casting 4 to be on the same line, and control the positioning accuracy of the rudder stock center to be ±0.3mm; mark the fillet joints and butt welding sequence, welding angle size, groove gap, groove size and groove angle information of the longitudinal grid plate and the transverse grid plate 3 with the rudder stock bearing seat and the rudder pintle bearing seat steel casting 4 in combination with the rudder blade drawings. Figure 10As shown, pressure pointers of a control welding monitoring tool are installed on both sides of the locations where the rudder stock bearing steel casting 5 and the rudder pintle bearing steel casting 4 are installed. The pressure pointers are connected to the steel castings via a supporting clamp, one end of which is glued to the steel castings. The center point of the pressure pointers is located on the center line of the rudder stock of the steel castings. This allows monitoring of the offset of the rudder stock center line when the rudder stock bearing and the rudder pintle bearing steel castings 4 are joined to the internal structure at the corner joints. The welding sequence is adjusted based on the intuitive offset. Specifically, the deflection of the tooling pressure pointers on both sides of the rudder blade can be used to intuitively understand whether the rudder stock center of the steel castings is deflected. If the pointers are displaced, the welding sequence between the steel castings and the structure is adjusted in the opposite direction based on the pointer displacement.

[0063] Specifically, step S8 comprises selecting a plurality of target points for each grid plate structure inside the rudder blade after the assembly components of the rudder blade grid plate and the wrap plate backing plate are assembled and welded, using a total station to re-measure the position data of the target points on the internal structure of the rudder blade, performing simulation analysis with the coordinate data in the three-dimensional model, trimming the grid plates with data exceeding the standard, and installing the wrap plate on the other side of the rudder blade after all the internal grid plates are measured to meet the standard; in the installation of the wrap plate on this side, the wrap plate is dispersed from the middle to both sides to reduce the cumulative error, and after the installation is completed, adjusting the groove distance between the wrap plates, and welding is performed to complete the rudder blade.

[0064] like Figure 12 As shown, step S9 specifically involves performing stress relief on the outer surface of the rudder blade after the rudder blade is manufactured. Specifically, when the rudder blade is located on the tire frame template, a 300-350°C flame is used to perform preliminary stress relief on the positions of the grid plates on both sides of the rudder blade. Then, the rudder blade is hoisted to the ground and laid flat. Wooden blocks are used to pad the lower part of the rudder blade to control the overall level of the rudder blade and ensure that the rudder stock hole is in a horizontal state. 8-12 points are selected on the rudder blade, stress monitoring target points are installed, and a stress relief instrument is turned on. The stress relief instrument is used to vibrate the cladding weld until the weld stress test passes.

[0065] Specifically, step S10 includes: after the rudder blade is inspected and sent for painting, it is transferred to the bottom of the rudder stock by the in-dock transfer platform vehicle, and the rudder blade is installed using the jacking device of the in-dock transfer platform vehicle. When the rudder stock is inserted into the rudder stock hole of the rudder stock bearing seat and the rudder pintle bearing seat, the fitting clearance between them is ensured to be 0.05 mm.

[0066] Those skilled in the art should understand that the above description is only a specific 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. A method for manufacturing and installing a semi-suspended twisted rudder blade for a ship, characterized in that: The following steps are involved: S1. Design and draw rudder blade structure drawings, tire frame template drawings, component assembly line drawings, and plate positioning drawings; design welding nodes; and mark welding grooves, groove angles, and groove gap information in the drawings; S2. Pre-assemble the longitudinal and transverse gratings inside the rudder blade in the inner field. Using the rudder blade internal grating as the base, install the horizontal ribs to form two independent grating assembly components. S3. Fabricate the rudder blade cladding template and rudder blade cladding; the rudder blade cladding is fabricated by dividing the port side cladding of the rudder blade into several pieces. Using cold-pressing equipment, the cladding is cold-processed by bending, rolling, and spot-pressing the plates. After the uneven teardrop-shaped cladding is completed, it is tested using a template to ensure that it fits the template after processing. All the formed cladding is hoisted onto the cladding template and tested for conformity with the cladding template. S4. Position the rudder blade side cover plate and weld it to form the entire rudder blade side cover plate; S5. Mark the cladding positioning line on the cladding. Specifically, according to the component assembly marking drawing, use chalk line and total station to mark the cladding positioning line on the cladding on one side of the entire rudder blade; S6. Positioning and installing the grid assembly components, specifically installing the assembly guide plate on either side of the package plate positioning line, and sliding the grid assembly components along the guide plate into position at the assembly guide plate; S7. Electric weld the two grating assembly components to the cladding plate, then install the rudder stock bearing steel casting and the rudder pintle bearing steel casting; S8. Install the cladding on the other side of the rudder blade. Install the cladding from the center outward to both sides to reduce cumulative errors. After installation, adjust the groove distance between the cladding plates and weld them. The rudder blade is now complete. S9. Stress relief on the outer surface of the rudder blade; S10. Fold and install the rudder blades.

2. A method for manufacturing and installing a semi-suspended twisted rudder blade for a ship according to claim 1, characterized in that: The welding nodes include the welding nodes between two adjacent single rudder blade cladding plates on the port side, the welding nodes between two adjacent single rudder blade cladding plates on the starboard side, the welding nodes between the starboard side cladding plate and the longitudinal and transverse bulkheads inside the twisted rudder blade, the welding nodes between a rib in the rudder stock bearing steel casting and the rudder pintle bearing steel casting and the longitudinal bulkhead inside the rudder blade, the welding nodes between the rudder stock bearing steel casting and the rudder blade top plate, the welding nodes between the rudder pintle bearing steel casting and the horizontal bulkhead inside the rudder blade, and the welding nodes between the rudder stock bearing steel casting and the rudder pintle bearing steel casting and the horizontal bulkhead inside the rudder blade; wherein, a V-shaped groove is used between two adjacent single rudder blade cladding plates on the port side, the groove spacing is kept at 6±2mm, and the groove angle is 35 °, plug welding is adopted between the starboard side cladding plate and the longitudinal and transverse bulkheads inside the twisted rudder blade, V-shaped grooves are adopted between the rudder stock bearing steel casting and one of the ribs in the rudder pintle bearing steel casting and the longitudinal bulkhead inside the rudder blade, the groove spacing is retained at 2±2mm, the groove angle is 45°, V-shaped grooves are adopted between the rudder stock bearing steel casting and the rudder pintle bearing steel casting and the horizontal bulkhead inside the rudder blade, the groove spacing is retained at 2±2mm, the groove angle is 45°, V-shaped grooves are adopted between the rudder stock bearing steel casting and the rudder pintle bearing steel casting and the horizontal bulkhead inside the rudder blade, the groove spacing is retained at 2±2mm, the groove angle is 45°, V-shaped grooves are adopted between two adjacent single rudder blade cladding plates on the starboard side, the groove spacing is retained at 6±2mm, the groove angle is 45°.

3. The method for manufacturing and installing a semi-suspended twisted rudder blade for a ship according to claim 1, characterized in that: The step S3 specifically includes drawing each tire frame position line on a rigid platform, installing each tire frame template along the line on each tire frame position line, welding each tire frame template to the rigid platform, and using a total station to measure three measurement points located at the head, middle and tail of each tire frame template.

4. A method for manufacturing and installing a semi-suspended twisted rudder blade for a ship according to claim 1, characterized in that: The step S4 specifically comprises lifting the cladding plate on one side of the rudder blade to the cladding plate frame template, positioning the cladding plate according to the cladding plate positioning diagram, and using a total station to measure the four corner positioning data of the cladding plate and compare it with the model data. After the data is correct, the cladding plate is welded to form the cladding plate on one side of the entire rudder blade.

5. The method for manufacturing and installing a semi-suspended twisted rudder blade for a ship according to claim 1, characterized in that: The step S7 further includes installing a cross target frame at the upper and lower openings of the rudder stock bearing and the pintle bearing during positioning and installation of the rudder stock bearing and the pintle bearing, passing a 0.3 mm steel wire through the center points of the upper and lower cross targets, and measuring with a total station whether the steel wire is in the center of the cross targets; and after the rudder blade grid plate is assembled and the cover plate is welded, measuring the positioning data of the rudder stock bearing and the pintle bearing steel castings with the total station, and adjusting the rudder stock hole centers of the rudder stock bearing and the pintle bearing steel castings to align.

6. A method for manufacturing and installing a semi-suspended twisted rudder blade for a ship according to claim 5, characterized in that: In step S7, the order of the fillet and butt welding of the longitudinal and transverse grid plates to the rudder stock and pintle seat steel castings, the size of the weld fillet, the groove gap, the groove size, and the groove angle are indicated in conjunction with the rudder blade drawings. Pressure indicators of a control welding monitoring tool are installed on both sides of the position where the rudder stock and pintle seat steel castings are installed to monitor whether the rudder stock centerline is offset when the rudder stock and pintle seat steel castings are connected to the internal structure at the corner joints.

7. The method for manufacturing and installing a semi-suspended twisted rudder blade for a ship according to claim 1, characterized in that: Specifically, step S8 is to use a total station to re-measure the target point position data on the internal structure of the rudder blade after the rudder blade grid plate assembly components and the wrapping plate are welded together, and to perform simulation analysis with the coordinate data in the three-dimensional model to trim the grid plates that exceed the data. After all the internal grid plates meet the measurement standards, the rudder blade wrapping plate on the other side is installed.

8. The method for manufacturing and installing a semi-suspended twisted rudder blade for a ship according to claim 1, characterized in that: The step S9 specifically comprises performing stress relief on the outer surface of the rudder blade after the rudder blade is manufactured. Specifically, when the rudder blade is on the tire frame template, a 300-350°C flame is used to perform preliminary stress relief on the grid positions on the outer surfaces of both sides of the rudder blade. Then, the rudder blade is hoisted to the ground and laid flat. Wooden blocks are used to level the lower part of the rudder blade to control the overall level of the rudder blade and ensure that the rudder stock hole is in a horizontal state. 8-12 points are selected on the rudder blade, stress monitoring target points are installed, and a stress relief instrument is turned on. The stress relief instrument is used to vibrate the cladding weld until the weld stress test passes.

9. A method for manufacturing and installing a semi-suspended twisted rudder blade for a ship according to claim 7, characterized in that: Specifically, step S10 includes: after the rudder blade is inspected and sent for painting, it is transferred to the bottom of the rudder stock by the in-dock transfer platform vehicle, and the rudder blade is installed using the lifting device of the in-dock transfer platform vehicle. When the rudder stock is inserted into the rudder stock hole of the rudder stock seat and the rudder pintle seat, the fitting clearance between them is ensured to be 0.05 mm.

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