Ship sheet correction method

Abstract

The invention discloses a ship thin plate correcting method. The ship thin plate correcting method comprises the following steps that thin plates of an upper-layer building are corrected from bottom to top; the plate body is divided into a plurality of to-be-corrected areas by every two adjacent structural parts on the back face of the face, provided with the structural parts, of the plate body, hot work correction is conducted on each to-be-corrected area in sequence, and every two adjacent to-be-corrected areas are spaced by at least one to-be-corrected area in position in sequence. According to the ship thin plate correction method, accurate control over thermal deformation can be improved. According to the invention, heating is successively carried out on the spaced to-be-corrected areas, so that mutual superposition of the heat affected areas of the two to-be-corrected areas can be effectively prevented, an enough cooling area is formed between each heated to-be-corrected area, heat can be conducted and dissipated to the surroundings in a space and time manner, and temperature accumulation of the heat affected areas is prevented. According to the ship thin plate correction method, more uniform contractility can be generated, and plate deformation can be corrected more smoothly and controllably.

Description

Technical Field

[0001] The present invention relates to the field of shipbuilding, and in particular to a method for correcting a ship thin plate. Background Art

[0002] Ship superstructures, as crucial functional areas for crew living and working, are primarily constructed from thin steel plates, typically 6-7mm thick. This thin plate structure undergoes multiple construction processes, including cutting, welding, hoisting, and transportation, which can easily lead to significant welding deformation and overall instability, resulting in uneven surfaces on decks and surrounding walls. Because superstructures demand extremely high aesthetics and structural precision for the living environment, regulations typically require a flatness deviation within ±6mm. Therefore, effective correction (pyrotechnic correction) of deformed areas is an essential and critical step in construction.

[0003] However, existing correction processes for deformation of superstructure thin plates generally lack systematicity and standardization. Typically, an empirical approach of "correcting where uneven it is" is adopted, meaning flame heating correction is only performed on protrusions visible to the naked eye or locally detected. This local, isolated correction method lacks sufficient consideration of the overall structural deformation trend and residual stress distribution. As a result, the stress in the corrected area is not effectively released or balanced during the cooling process and is often transferred to adjacent areas. This leads to new deformation in other areas after the area is corrected and leveled, forming a vicious cycle that seriously restricts the overall correction efficiency and the achievement of the ultimate accuracy goal.

[0004] Excessive unevenness in the superstructure's thin plate structure poses significant risks. First, it severely compromises the aesthetics and comfort of the cabins, failing to meet the high-quality living area requirements of shipowners and regulations. Second, deformation can affect the subsequent installation of interior materials, leading to installation difficulties, uneven joints, or hollowing. More importantly, excessive wave deformation can weaken the local stiffness and stability of the thin plate structure, potentially becoming a source of fatigue and compromising the structural safety and service life of the superstructure. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for correcting ship thin plates in order to overcome the defects in the prior art that the correction process lacks systematic operation specifications and the flatness of the corrected thin plates is low and difficult to meet the use requirements.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a method for correcting thin plates of ships, wherein the thin plates include a plate body and a plurality of structural members welded at intervals on the inner surface of the plate body, wherein the plurality of thin plates are connected to form a superstructure, and the method for correcting thin plates of ships includes the following steps: correcting the thin plates in order from bottom to top on the superstructure; dividing the plate body into a plurality of areas to be corrected with every two adjacent structural members on the back side of the plate body on which the structural members are provided, performing pyrotechnic correction on each area to be corrected in turn, and two areas to be corrected that are adjacent in order are spaced apart by at least one area to be corrected in position.

[0008] In this solution, the ship thin plate correction method can improve the precise control of thermal deformation. Since pyrotechnic leveling uses the shrinkage force generated by cooling after local heating to correct deformation, heating the spaced areas to be corrected successively can effectively prevent the heat-affected zones of the two areas to be corrected from overlapping each other, so that there is enough cooling area between each heated area to be corrected, so that heat has space and time to conduct and dissipate to the surrounding area, preventing the accumulation of temperature in the heat-affected zone. If the accumulated temperature of the heat-affected zone is too high, it may cause changes in the metallographic structure, thereby damaging the mechanical properties and corrosion resistance of the material. Therefore, compared with conventional pyrotechnic leveling operations, this ship thin plate correction method can produce a more uniform shrinkage force, achieving a smoother and more controllable correction of plate deformation.

[0009] Preferably, the ship thin plate correction method also includes: in the heating position, the heating starting point is set close to the edge of the area to be corrected; in the heating direction, long line heating is performed along the extension direction of the structural member; in the heating sequence, the recessed area is heated first and then the protruding area.

[0010] In this solution, the heating starting point is set close to the edge of the area to be corrected, that is, the heating starting point avoids the empty space in the middle of the area to be corrected. This is because if a fire is started in the empty space, the heating temperature requirement is high. If the heating temperature is not well controlled, the overall straightening will be basically completed, but unevenness will appear at the heated area. Since the welding between the structural member and the plate body is generally a long straight weld, the deformation of the thin plate is generally the angular deformation caused by the long straight weld. Long linear heating along the extension direction of the structural member can form a continuous constrained plastic deformation band. When the deformation band cools, the synchronous contraction of the entire deformation band can effectively correct the curvature caused by the angular deformation. Since there are usually residual compressive stresses in the concave area and residual tensile stresses in the convex area, if the convex area is heated first, its cooling and contraction will further increase the tensile stress and aggravate the deformation of the concave area. By heating the concave area first, the compressive stress is released through the expansion and contraction process, providing a stable foundation for the subsequent correction of the convex area, thereby avoiding stress superposition and worsening deformation.

[0011] Preferably, during multiple heating, the heating starting point is adjusted within the range of 10 to 20 mm from the structural component in the area to be corrected.

[0012] In this solution, the heating starting point is adjusted within the range of 10 to 20 mm from the structural member to avoid direct heating on the back of the structural member. Since structural members generally have load-bearing requirements, direct heating on the back of the structural member will destroy the metal fiber state formed by the original welding and reduce the load-bearing capacity of the structural member.

[0013] Preferably, the ship thin plate correction method further includes the following steps: dividing the plurality of thin plates into outer decks, inner decks, outer peripheral walls and inner peripheral walls according to their connection positions, and performing pyrotechnic correction on each of them using different parameters.

[0014] In this solution, the functions and performance requirements of thin plates at different positions are also different. Therefore, using different parameters to perform pyrotechnic correction on thin plates at different positions can better adapt to the needs of the thin plates.

[0015] Preferably, in the step of dividing the plurality of thin plates into outer decks, inner decks, outer peripheral walls and inner peripheral walls according to their connection positions, and performing pyrotechnic correction on each of them using different parameters, the pyrotechnic correction of the outer deck includes: during heating correction, maintaining a distance between the heating route and the sprinkler cooling water at 45 mm to 55 mm, a heating temperature less than 900°C, a heating width not greater than 30 mm, and a heating depth of 2 / 3 of the plate thickness.

[0016] In this solution, the above parameters can meet the performance requirements of the outer deck.

[0017] Preferably, in the step of dividing the plurality of thin plates into an outer deck, an inner deck, an outer peripheral wall and an inner peripheral wall according to their connection positions, and performing pyrotechnic correction on each of them using different parameters, the pyrotechnic correction of the inner deck includes: during the heating correction, keeping the distance between the heating circuit and the nozzle cooling water no more than 100 mm, the heating temperature being 890°C to 910°C, and the heating width being no more than 40 mm.

[0018] In this solution, the above parameters can meet the performance requirements of the inner deck.

[0019] Preferably, when one of the areas to be corrected has both concave and convex deformations, the pyrotechnic correction of the inner deck further comprises: first heating the areas between the concave and convex parts, with the heating route being in the shape of short lines, and then heating the convex parts.

[0020] In this solution, the concave and convex deformation areas are usually closely adjacent. If long lines are used for heating, they will cover both the raised and recessed areas, causing the convexity or concavity to intensify. Short lines can be flexibly selected according to the needs of the convex or recessed areas.

[0021] Preferably, in the step of dividing the plurality of thin plates into outer decks, inner decks, outer walls and inner walls according to their connection positions, and performing pyrotechnic corrections on them respectively using different parameters, the pyrotechnic correction of the inner wall includes: during heating correction, maintaining the distance between the heating circuit and the nozzle cooling water at 45mm to 55mm, the heating temperature at 690°C to 710°C, and the heating width at 25mm to 35mm.

[0022] In this solution, the above parameters can meet the performance requirements of the inner wall.

[0023] Preferably, in the step of dividing the plurality of thin plates into outer decks, inner decks, outer peripheral walls and inner peripheral walls according to their connection positions, and performing pyrotechnic corrections on them respectively using different parameters, the pyrotechnic correction of the outer peripheral walls includes: during heating correction, maintaining the distance between the heating circuit and the nozzle cooling water at 45 mm to 55 mm, and the heating temperature at 940°C to 960°C.

[0024] In this solution, the above parameters can meet the performance requirements of the outer wall.

[0025] Preferably, the step of correcting the thin plates of the superstructure in order from bottom to top specifically includes: correcting the first layer of thin plates first, and then correcting them in the order of inner deck, outer deck, inner wall, and outer wall. After the correction of the first layer is completed, the upper layer is corrected in the same order.

[0026] In this solution, correcting the lower area first allows it to cool down first, which then becomes a rigid support point. Furthermore, a correction reference surface is formed in the lower area, allowing the deformation amount to be accurately predicted when correcting the upper area.

[0027] The positive progress effect of the present invention is:

[0028] The ship thin plate correction method of the present invention can improve the precise control of thermal deformation. Since pyrotechnic leveling uses the shrinkage force generated by cooling after local heating to correct deformation, heating the spaced areas to be corrected successively can effectively prevent the heat-affected zones of the two areas to be corrected from overlapping each other, so that there is enough cooling area between each heated area to be corrected, so that heat has space and time to be conducted and dissipated to the surroundings, thereby preventing the accumulation of temperature in the heat-affected zone. If the accumulated temperature of the heat-affected zone is too high, it may cause changes in the metallographic structure, thereby damaging the mechanical properties and corrosion resistance of the material. Therefore, compared with conventional pyrotechnic leveling operations, the ship thin plate correction method can generate a more uniform shrinkage force, achieving a smoother and more controllable correction of plate deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The figure is a flow chart of a ship thin plate correction method according to an embodiment of the present invention.

[0030] Figure 2 Schematic diagram of the correction sequence of the superstructure according to an embodiment of the present invention.

[0031] Figure 3 Schematic diagram of the correction sequence of the outer deck according to an embodiment of the present invention.

[0032] Figure 4 2 is a cross-sectional view of an outer deck according to an embodiment of the present invention.

[0033] Figure 5 Schematic diagram of the correction sequence of the inner deck according to an embodiment of the present invention.

[0034] Figure 6 Schematic diagram of the correction sequence of the inner wall according to an embodiment of the present invention.

[0035] Figure 7 Schematic diagram of the structure of the inner wall of an embodiment of the present invention.

[0036] Figure 8 Schematic diagram of hammering points on the inner wall according to an embodiment of the present invention.

[0037] Figure 9 Schematic diagram of the structure of the door and window openings of an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] superstructure 1;

[0040] Plate 2;

[0041] Structural member 3;

[0042] Outer deck 4;

[0043] Area to be corrected 5;

[0044] Heating route 6;

[0045] inner deck 7;

[0046] inner wall 8;

[0047] Door and window openings 9; DETAILED DESCRIPTION

[0048] A preferred embodiment is given below and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0049] like Figures 1 to 9As shown, this embodiment provides a method for correcting thin plates of a ship. The superstructure 1 of the ship is composed of thin plates with a thickness of usually 6-7 mm. The thin plates include a plate body 2 and a plurality of structural members 3 welded at intervals on the inner surface of the plate body 2. The structural members 3 are long beams vertically welded to the plate body 2 to form a T-shaped support structure. The plurality of structural members 3 are parallel and spaced apart on the same outer surface of the plate body 2.

[0050] The method for correcting thin plates of ships uses the pyrotechnic correction operation in the prior art. Preparation work is required before performing pyrotechnic correction: before correcting the superstructure 1, the pyrotechnician must prepare the workers according to the size of the superstructure 1 and the deformation situation. The heating torch should be selected reasonably, and the gas source hose should ensure normal ventilation. Acetylene gas is preferably used as the combustible gas, which has a high calorific value and good correction efficiency. In other embodiments, combustible gases such as natural gas and propane gas can also be used, but the calorific value of natural gas and propane gas is low, and the correction efficiency is poor.

[0051] The ship sheet correction method includes the following steps:

[0052] like Figure 2 As shown, in the overall correction sequence, the thin plates of the superstructure 1 are corrected in the order from bottom to top in the height direction.

[0053] Specifically, the first layer of thin plates is straightened, starting from the first layer upwards, followed by the second and third layers, and gradually working upwards. The straightening process for the entire superstructure (1) begins with the first layer, following the inner deck (7) and then the outer deck (4), then the inner perimeter wall (8) and then the outer perimeter wall, and finally the panel surface and then the door and window openings (9). Straightening is then carried out from the first layer upwards to the second layer, and finally to the highest layer. Flatness is then inspected and corrected, and local corrections are made to ensure that the overall structure meets quality requirements before submission for acceptance.

[0054] This allows the lower areas, such as the first floor, to be corrected first, allowing them to cool down first. This cool area then becomes a rigid support point. This also creates a correction reference surface in the lower area, allowing for accurate prediction of the amount of deformation when correcting upper areas, such as those on higher floors.

[0055] In terms of overall area division, the thin plates are divided into outer deck 4, inner deck 7, outer wall, and inner wall 8 according to their connection locations. Different parameters are used for pyrotechnic correction in each area. The functions and performance requirements of thin plates in different locations are also different. Therefore, using different parameters for pyrotechnic correction in different locations can better meet the needs of the thin plates.

[0056] During pyrotechnic correction, the back side of the plate 2 with the structural member 3 (i.e., the other side of the plate with the structural member 3) is divided into a plurality of elongated correction areas 5 between each pair of adjacent structural members 3. Specifically, the plate surface between each pair of structural members 3 is a correction area 5. Each correction area 5 is corrected sequentially, with at least one correction area 5 separating two adjacent correction areas 5.

[0057] Specifically, if Figure 3 As shown, on the outer deck 4, the areas to be corrected 5 are arranged from left to right, and the correction order is as follows: Figure 3 The areas to be corrected are heated and corrected in the order of the numbers in the figure. The areas to be corrected are 1 to 8 from left to right, and the correction order is 81624735 from left to right.

[0058] In this way, the use of this ship thin plate correction method can improve the precise control of thermal deformation. Since pyrotechnic leveling uses the shrinkage force generated by cooling after local heating to correct deformation, heating the spaced areas 5 to be corrected successively can effectively prevent the heat-affected zones of the two areas 5 to be corrected from overlapping each other, so that there is enough cooling area between each heated area 5 to be corrected, so that heat has space and time to conduct and dissipate to the surrounding area, thereby preventing the accumulation of temperature in the heat-affected zone. If the accumulated temperature of the heat-affected zone is too high, it may cause changes in the metallographic structure, thereby damaging the mechanical properties and corrosion resistance of the material. Therefore, compared with conventional pyrotechnic leveling operations, this ship thin plate correction method can produce a more uniform shrinkage force, achieving a smoother and more controllable correction of plate deformation.

[0059] Furthermore, the ship thin plate correction method also includes: in the heating position, the heating starting point is set close to the edge of the area to be corrected 5; in the heating direction, long line heating is performed along the extension direction of the structural member 3; in the heating sequence, the recessed area is heated first and then the protruding area.

[0060] In this way, the heating starting point is set close to the edge of the area to be corrected 5, that is, the heating starting point avoids the middle empty space area of ​​the area to be corrected 5. This is because if a fire is started in the empty space, the heating temperature requirement is high. If the heating temperature is not well controlled, the overall flatness will be basically corrected, but unevenness will appear at the heated area. Since the welding between the structural member 3 and the plate body 2 is generally a long straight weld, the deformation of the thin plate is generally the angular deformation caused by the long straight weld. Long linear heating along the extension direction of the structural member 3 can form a continuous constrained plastic deformation band. When the deformation band cools, the synchronous contraction of the entire deformation band can effectively correct the curvature caused by the angular deformation. Since there are usually residual compressive stresses in the concave area and residual tensile stresses in the convex area, if the convex area is heated first, its cooling and contraction will further increase the tensile stress and aggravate the deformation of the concave area. By heating the concave area first, the compressive stress is released through the expansion and contraction process, providing a stable foundation for the subsequent correction of the convex area, thereby avoiding stress superposition and worsening deformation.

[0061] In this embodiment, if Figure 3 As shown, the heating route 6 is the path shown by the arrow in the figure, and heating is performed on both sides of the structural member 3 respectively.

[0062] Specifically, if Figure 4 As shown, during multiple heating, the heating starting point is adjusted within the range of 310 to 20 mm from the structural part in the area 5 to be corrected.

[0063] In this way, adjusting the heating starting point within the range of 10 to 20 mm from the structural member 3 can avoid direct heating on the back of the structural member 3. Since the structural member 3 generally has load-bearing requirements, direct heating on the back of the structural member 3 will destroy the metal fiber state formed by the original welding and reduce the load-bearing capacity of the structural member 3.

[0064] Deformation of the outer deck 4 of the superstructure 1 is generally wavy and has localized concave-convex deformation at the joints. When correcting the outer deck 4 of the superstructure 1, it is best to heat the back of the structural member 3 with hot work and cool it with water. Direct hammering is generally not recommended.

[0065] Specifically, in the step of dividing a plurality of thin plates into an outer deck 4, an inner deck 7, an outer wall, and an inner wall 8 according to their connection positions, and performing pyrotechnic correction on each of them using different parameters, the pyrotechnic correction of the outer deck 4 includes: during the heating correction, maintaining the distance between the heating path 6 and the sprinkler cooling water at 45 mm to 55 mm, the heating temperature being less than 900°C, the heating width being no more than 30 mm, and the heating depth being 2 / 3 of the plate thickness.

[0066] In this way, the performance requirements of the outer deck 4 can be met by adopting the above parameters.

[0067] In this embodiment, the flatness of the outer deck 4 should be corrected starting with the less deformed areas and gradually progressing to the more deformed areas. If the deck is significantly deformed and requires more personnel, the correction should be dispersed and performed simultaneously at several points. It is not advisable to concentrate too many people on a single portion of the deformed deck, as this approach can easily cause the corrected area to collapse. For decks with significant deformation, multiple heating corrections must be performed on the back of the structural member 3. To prevent the structural member 3 from collapsing, support tools should be used to temporarily tighten the structural member 3 upwards, if necessary, before continuing the heating correction.

[0068] For the inner deck 7 of the superstructure 1, since most or all of the inner deck 7 is to be installed inside and is not exposed to the outside, the correction requirements of the inner deck 7 can be appropriately lower than those of the outer deck 4. However, the correction must ensure that the overall flatness of the deck meets the requirements, and after the correction, there should be no looseness when stepping on the deck, so that the deck is in a tightened state.

[0069] Specifically, in the step of dividing several thin plates into an outer deck 4, an inner deck 7, an outer wall and an inner wall 8 according to their connection positions, and performing pyrotechnic correction on each of them using different parameters, the pyrotechnic correction of the inner deck 7 includes: during heating correction, maintaining the distance between the heating circuit and the nozzle cooling water no greater than 100 mm, the heating temperature being 890°C to 910°C, and the heating width being no greater than 40 mm.

[0070] In this way, the performance requirements of the inner deck 7 can be met by adopting the above parameters.

[0071] Specifically, when a region 5 to be corrected has both concave and convex deformations, the pyrotechnic correction of the inner deck 7 further includes: first heating the alternating concave and convex portions, with the heating route 6 being a short line, and then heating the convex portions.

[0072] In this way, the concave and convex deformation areas are usually closely adjacent. If long lines are used for heating, both the raised and recessed areas will be covered, resulting in aggravated convexity or concavity. Short lines can be flexibly selected according to the needs of the convex or recessed areas.

[0073] In this embodiment, after the correction and heating are completed on the back of each rib position of the deck, if there are still uneven flatness, it is necessary to correct it in the blank space of the area to be corrected 5. Figure 5 As shown, correction can be achieved by heating a long local strip, followed by heating the blank space with a short strip. The order of the short strip corrections from left to right is 6173524. Ensure that there is at least one heating distance between each two adjacent heatings.

[0074] For the inner wall 8 of the superstructure 1, the inner wall 8 plate is relatively thin, and the heating temperature must be controlled during heating. In addition, the size of the wall deformation must be considered to determine the heating width in order to achieve a better correction effect.

[0075] Specifically, in the step of dividing several thin plates into an outer deck 4, an inner deck 7, an outer wall and an inner wall 8 according to their connection positions, and performing pyrotechnic correction on each of them using different parameters, the pyrotechnic correction of the inner wall 8 includes: during heating correction, maintaining the distance between the heating circuit and the nozzle cooling water at 45mm to 55mm, the heating temperature at 690°C to 710°C, and the heating width at 25mm to 35mm.

[0076] In this way, the performance requirements of the inner wall 8 can be met by adopting the above parameters.

[0077] In this embodiment, if the deformation of the inner wall 8 is not large, the heating temperature and heating width can be appropriately reduced, and the heating speed can be appropriately increased. Figure 6 As shown, the heating order of the area to be corrected 5 from left to right is 14253. During the correction heating, since the deformation of the connection between the inner wall 8 and the upper and lower decks is relatively small, as shown in FIG. Figure 7 As shown, during correction, a gap of about 150 mm can be left between the inner wall 8 and the upper and lower edges (as shown by the arrows) without heating correction, and the heating speed can be appropriately accelerated when heating to the upper and lower edges.

[0078] Furthermore, after each area 5 to be corrected of the inner wall 8 is corrected, if the flatness still does not meet the requirements, a second hot-fire heating correction can be repeated at the original location. If it still does not meet the requirements, the uneven and deformed spaces of the area 5 to be corrected of the inner wall can be corrected by heating with short lines or heating with dots and then hammering. Figure 8 As shown in the figure, the small circles are the hammering points. Preferably, the short line heating correction and hammering method are used simultaneously for correction. The short line and dot heating hammering correction methods also start from the protrusion.

[0079] As for the outer wall of the superstructure 1, since the outer wall is exposed to the outside, a high requirement for flatness is imposed.

[0080] Specifically, in the step of dividing several thin plates into an outer deck 4, an inner deck 7, an outer wall and an inner wall 8 according to their connection positions, and using different parameters to perform pyrotechnic correction on each of them, the pyrotechnic correction of the outer wall includes: during heating correction, maintaining the distance between the heating circuit and the nozzle cooling water at 45mm to 55mm, the heating temperature at 940°C to 960°C, and the heating width determined according to the deformation amount.

[0081] In this way, the performance requirements of the outer wall can be met by adopting the above parameters.

[0082] In this embodiment, for minor deformation, i.e., deformation δ≤3mm / ㎡, the heating width is generally 15-25mm (approximately 2-3 times the plate thickness). For moderate deformation, i.e., deformation 3mm<δ≤8mm / ㎡, the heating width is generally 30-50mm (approximately 4-7 times the plate thickness). For severe deformation, i.e., deformation δ>8mm / ㎡, the heating width is generally 50-80mm (approximately 7-11 times the plate thickness).

[0083] If unevenness still exists after correction, further correction can be performed on the inner wall 8. Long strips of heat can be applied to the back of the outer wall where the structural member 3 is located, on both sides of the weld seam of the two outer walls, near the structural member 3, while water is used to cool the side where the structural member 3 is located. If correction is still not achieved, direct heating can be applied to both sides of the weld seam and water cooling can be used on the side where the structural member 3 is located.

[0084] For the deformation correction of the doors and windows on the inner and outer walls, such as Figure 9 As shown, the four corners of the door and window openings 9 can be corrected by using a triangular heating and water cooling method. The length and width of the triangular heating can be determined according to the deformation conditions of the door and window edges, and this embodiment does not limit this.

[0085] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A method for straightening a thin plate of a ship, wherein the thin plate comprises a plate body and a plurality of structural members welded at intervals on the inner surface of the plate body, wherein the plurality of thin plates are connected to form a superstructure, characterized in that: The ship sheet correction method comprises the following steps: Correcting the thin plates of the superstructure in order from bottom to top; On the back side of the plate body on which the structural members are provided, the plate body is divided into a plurality of areas to be corrected by every two adjacent structural members; Each of the areas to be corrected is subjected to pyrotechnic correction in turn; Two of the areas to be corrected that are adjacent in sequence are spaced apart from each other by at least one area to be corrected.

2. The ship sheet correction method according to claim 1, characterized in that: The ship sheet correction method further comprises: At the heating position, the heating starting point is set close to the edge of the area to be corrected; In the heating direction, long linear heating is performed along the extension direction of the structural member; In the heating sequence, heat the concave area first and then the convex area.

3. The ship sheet correction method according to claim 2, characterized in that: During multiple heating, the heating starting point is adjusted within the range of 10 to 20 mm from the structural component in the area to be corrected.

4. The ship sheet correction method according to claim 1, characterized in that: The ship sheet correction method further comprises the following steps: The plurality of thin plates are divided into an outer deck, an inner deck, an outer peripheral wall and an inner peripheral wall according to the connection positions, and pyrotechnic correction is performed respectively using different parameters.

5. The ship sheet correction method according to claim 4, characterized in that: In the step of dividing the plurality of thin plates into outer decks, inner decks, outer peripheral walls and inner peripheral walls according to the connection positions and performing pyrotechnic correction on the outer decks using different parameters, the pyrotechnic correction on the outer decks includes: During heating correction, the distance between the heating route and the sprinkler cooling water should be kept at 45mm to 55mm, the heating temperature should be less than 900°C, the heating width should not exceed 30mm, and the heating depth should be 2 / 3 of the plate thickness.

6. The ship sheet straightening method according to claim 4, characterized in that: In the step of dividing the plurality of thin plates into outer decks, inner decks, outer peripheral walls and inner peripheral walls according to the connection positions and performing pyrotechnic correction on the respective plates using different parameters, the pyrotechnic correction on the inner deck includes: During heating correction, keep the distance between the heating line and the nozzle cooling water no more than 100mm, the heating temperature is 890°C to 910°C, and the heating width is no more than 40mm.

7. The ship sheet straightening method according to claim 6, characterized in that: When one of the areas to be corrected has both concave and convex deformations, the pyrotechnic correction of the inner deck further includes: First, heat the concave and convex parts, and the heating route is in the shape of short lines, and then heat the convex parts.

8. The ship sheet straightening method according to claim 4, characterized in that: In the step of dividing the plurality of thin plates into outer decks, inner decks, outer walls and inner surrounding walls according to the connection positions, and performing pyrotechnic correction on each of the outer decks using different parameters, the pyrotechnic correction on the inner surrounding wall includes: During heating correction, keep the distance between the heating line and the nozzle cooling water at 45mm to 55mm, the heating temperature at 690°C to 710°C, and the heating width at 25mm to 35mm.

9. The ship sheet straightening method according to claim 4, characterized in that: In the step of dividing the plurality of thin plates into outer decks, inner decks, outer walls and inner surrounding walls according to their connection positions, and performing pyrotechnic correction on them respectively using different parameters, the pyrotechnic correction of the outer walls includes: during heating correction, maintaining the distance between the heating circuit and the nozzle cooling water at 45 mm to 55 mm, and the heating temperature at 940°C to 960°C.

10. The ship sheet straightening method according to claim 4, wherein: The step of correcting the thin plate of the superstructure from bottom to top specifically includes: Correct the first layer of thin plate first, and then correct them in the order of inner deck, outer deck, inner wall, and outer wall. After the correction of the first layer is completed, correct the upper layer in the same order.

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