A method for compensating the accuracy of the deck of a car carrier

Abstract

The present invention relates to the technical field of shipbuilding, and more particularly, to a method for compensating the accuracy of the deck of a pure car carrier. The method for compensating the accuracy of the deck of a pure car carrier is as follows: when welding the butt joints of the deck, the welding sequence of the deck is to first weld the upper deck and then weld the lower deck; the width of the butt joints gradually narrows in a stepped manner from the upper deck to the lower deck. The beneficial effects of the embodiments of the present invention are as follows: when welding the butt joints of the deck, welding is carried out from top to bottom. According to the assembly deformation coefficient and welding shrinkage coefficient of the deck, the width of the butt joints decreases in a stepped manner from top to bottom, reducing the influence of the assembly deformation coefficient and welding shrinkage coefficient of the deck on the welding accuracy and ensuring the accuracy of the sub-assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of shipbuilding, and in particular to a method for compensating the deck accuracy of a car transport ship. Background Art

[0002] Car carriers are mainly loaded with light cars. The main section is strongly supported by pillars, the main area structure is relatively empty, and the thickness of the car deck is relatively thin, mostly 6mm. During the construction of the main section, due to assembly deformation and welding shrinkage, the accuracy of the main section will be out of tolerance, which will have a great impact on the dock loading accuracy and cycle.

[0003] Conventional precision compensation for the closing seam area is applied synchronously. However, due to assembly deformation and welding shrinkage, the overall section is deformed and the half-width deviation of the main dimension occurs. To maintain the accuracy of the overall section, the problem that the half-width of the upper area of the overall section does not meet the accuracy requirements must be considered. In other words, how to ensure the accuracy of the overall section is a technical problem that needs to be urgently solved in the existing technology. Summary of the Invention

[0004] The object of the present invention is to provide a method for compensating the deck accuracy of a car carrier, which can improve the compensation accuracy of the closure seam area and thus ensure the overall section accuracy.

[0005] The embodiment of the present invention is achieved as follows:

[0006] The present invention provides a method for compensating the deck accuracy of a car carrier. When welding the closing seam of the deck, the welding order of the deck is to weld the upper deck first and then the lower deck.

[0007] The width of the closing seam narrows step by step from the upper deck to the lower deck.

[0008] In a preferred embodiment of the present invention, when the thickness, assembly deformation coefficient and welding shrinkage coefficient of all decks are the same, the width of the closing seam changes in a geometric progression.

[0009] In a preferred embodiment of the present invention, when the assembly deformation coefficient of the deck is greater than the assembly deformation coefficients of the upper deck and the lower deck, the width of the closing seam is smaller than the width of a normal geometric progression.

[0010] In a preferred embodiment of the present invention, when the welding shrinkage coefficient of the deck is greater than the welding shrinkage coefficients of the upper deck and the lower deck, the width of the closing seam is smaller than the width of a normal geometric progression.

[0011] In a preferred embodiment of the present invention, the gaps between two adjacent decks are the same.

[0012] In a preferred embodiment of the present invention, when the thickness of the deck is a, the gap between adjacent decks is b, the width of the butting joint is x, the number of deck layers is n, and the proportionality coefficient of the geometric progression is y, the relationship among them from bottom to top is as follows:

[0013]

[0014] Among them, the range of y is 0.5 - 0.8‰.

[0015] In a preferred embodiment of the present invention, the proportionality coefficient is: y = 0.65‰.

[0016] In a preferred embodiment of the present invention, the butting joint of the upper deck is centered and aligned with the butting joint of the lower deck.

[0017] The beneficial effects of the embodiments of the present invention are as follows:

[0018] When welding the butting joints of the decks, welding is carried out from top to bottom. According to the assembly deformation coefficient and welding shrinkage coefficient of the decks, the width of the butting joints decreases step by step from top to bottom, reducing the influence of the assembly deformation coefficient and welding shrinkage coefficient of the decks on the welding accuracy and ensuring the accuracy of the sub-assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 Schematic diagram of the calculation method of the width of the butting joint in the deck accuracy compensation method for a pure car carrier provided by the embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the position of the butting joint of the deck of a pure car carrier provided by the embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the compensation method for the butting joint in the deck accuracy compensation method for a pure car carrier provided by the embodiment of the present invention.

[0023] Reference numerals:

[0024] 1: Deck; 2: Butting joint; 3: Gap. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0027] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0029] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0030] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The following will be combined with Figure 1 , Figure 2 andFigure 3 , some embodiments of the present invention will be described in detail. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0032] The present invention provides a method for precision compensation of the deck 1 of a car carrier. When welding the butt joint 2 of the deck 1, the welding sequence of the deck 1 is to weld the upper deck 1 first and then the lower deck 1; the width of the butt joint 2 gradually narrows in a stepped manner from the upper deck 1 to the lower deck 1.

[0033] The welding sequence of a welded structure has a great influence on the deformation of the structure. Adopting a reasonable welding sequence is particularly important for controlling welding deformation. For the welding of thin plate sub-assemblies, the welding sequence of welding from top to bottom is adopted, as shown by the arrow direction in Figure 2 . When welding, it is advisable to arrange an even number of welders to weld symmetrically from left to right.

[0034] Due to welding shrinkage, the cumulative welding shrinkage of the upper deck 1 is larger than that of the lower deck 1, resulting in a smaller ship width of the upper deck 1. The conventional synchronous addition of the precision compensation amount in the area of the butt joint 2 cannot meet the construction requirements. Therefore, a stepped compensation amount addition method is adopted from bottom to top, that is, the width of the butt joint 2 gradually widens from the lower layer to the upper layer.

[0035] In this embodiment, by adding the stepped compensation amount, the overall main dimensions of the deck 1 can be effectively guaranteed, avoiding the need for cutting during the outfitting stage, improving production efficiency, and shortening the dock manufacturing cycle.

[0036] In a preferred embodiment of the present invention, when the thickness, assembly deformation coefficient, and welding shrinkage coefficient of all decks 1 are the same, the width change of the butt joint 2 forms a geometric sequence.

[0037] Specifically, in this embodiment, the assembly deformation coefficient refers to the deformation generated by the thin plate during assembly due to its own gravity or other external force factors after the deck 1 is assembled; the welding shrinkage coefficient refers to the shrinkage deformation generated by the thin plate due to the thermal stress during welding.

[0038] When the welding deformation of the deck 1 affects the precision of the sub-assembly, it is mainly affected by the assembly deformation coefficient and the welding shrinkage coefficient. Among them, the thickness of the deck 1 will also affect the assembly deformation coefficient and the welding shrinkage coefficient. When the thickness, assembly deformation coefficient, and welding shrinkage coefficient of the deck 1 are the same, the deformation ratio generated by the deck 1 will be the same. At this time, the width change of the butt joint 2 forms a geometric sequence.

[0039] In a preferred embodiment of the present invention, when the assembly deformation coefficient of the deck 1 is greater than the assembly deformation coefficients of its upper deck 1 and lower deck 1, the width of the butt joint 2 is smaller than the width in the normal geometric sequence.

[0040] Specifically, in this embodiment, when the thickness of the deck 1 and the welding shrinkage coefficient are the same, but the assembly deformation coefficient is different, the larger the assembly deformation coefficient, the less likely it is to deform. At this time, the deformation of the deck 1 is small, so the width of the closing joint 2 will be smaller than that in the normal geometric sequence, reducing the compensation.

[0041] Similarly, when the assembly deformation coefficient is smaller, it is more likely to deform. At this time, the deformation of the deck 1 is large. Therefore, the width of the closing joint 2 will be larger than that in the normal geometric sequence, increasing the compensation.

[0042] In a preferred embodiment of the present invention, when the welding shrinkage coefficient of the deck 1 is greater than the welding shrinkage coefficients of the upper deck 1 and the lower deck 1, the width of the closing joint 2 is smaller than that in the normal geometric sequence.

[0043] Specifically, in this embodiment, when the thickness and the assembly deformation coefficient of the deck 1 are the same, but the welding shrinkage coefficient of the deck 1 is different, the larger the welding shrinkage coefficient, the smaller the shrinkage deformation. The width of the closing joint 2 will be smaller than the width of the normal geometric sequence, reducing the compensation.

[0044] Similarly, when the welding deformation coefficient is smaller, the shrinkage deformation is larger. At this time, the deformation of the splint is large. Therefore, the width of the closing joint 2 will be larger than that in the normal geometric sequence, increasing the compensation.

[0045] In a preferred embodiment of the present invention, the gap 3 between adjacent two decks 1 is the same.

[0046] In this embodiment, when the floor height between the decks 1 is the same, and the thickness, the assembly deformation coefficient, and the welding shrinkage coefficient of the deck 1 are also the same, the geometric sequence can be simply changed to an arithmetic sequence, making it easier to calculate.

[0047] In a preferred embodiment of the present invention, when the thickness of the deck 1 is a, the gap 3 between adjacent decks 1 is b, the width of the closing joint 2 is x, the number of layers of the deck 1 is n, and the proportionality coefficient of the geometric sequence is y, the relationship among them from bottom to top is:

[0048] (1)

[0049] Among them, the range of y is 0.5 - 0.8‰.

[0050] In this embodiment, the thickness a of the deck 1 is a fixed value, the gap 3b between adjacent decks 1, that is, the floor height, is a fixed value, and the proportionality coefficient y of the geometric sequence is a set value or a calculated value, which is also a fixed value in formula (1). At this time, the width x of the closing joint 2 is only related to the number of layers n of the deck 1. It can be seen from formula (1) that the more layers from bottom to top, the larger the width of the closing joint 2.

[0051] In this embodiment, the width of the butting joint 2 of the bottommost deck 1 is zero, that is, welding is carried out after complete fitting. The butting joints 2 between the upper decks 1 increase linearly.

[0052] In this embodiment, the range of the proportionality coefficient y of the set geometric progression is 0.5 - 0.8‰, but it is not limited to this range only. It can be adjusted accordingly according to different materials, thicknesses, etc. of the deck 1 so that it meets the compensated accuracy.

[0053] In a preferred embodiment of the present invention, the proportionality coefficient y is: y = 0.65‰.

[0054] In this embodiment, the proportionality coefficient y is set to 0.65 per thousand, which can better meet the compensation of the deck 1 and is also more convenient for actual users to calculate.

[0055] In a preferred embodiment of the present invention, the butting joint 2 of the upper deck 1 is centered and aligned with the butting joint 2 of the lower deck 1.

[0056] In this embodiment, when welding compensation is carried out, the decks 1 on both sides of the butting joint 2 will deform and shrink simultaneously, and the shrinkage rates are the same. At this time, all the butting joints 2 are centered and aligned, which can make the ends of both ends of the deck 1 finally achieve the purpose of alignment.

[0057] The beneficial effects of the embodiments of the present invention are:

[0058] When welding the butting joint 2 of the deck 1, welding is carried out from top to bottom. According to the assembly deformation coefficient and welding shrinkage coefficient of the deck 1, the width of the butting joint 2 from top to bottom decreases step by step, reducing the influence of the assembly deformation coefficient and welding shrinkage coefficient of the deck 1 on the welding accuracy and ensuring the overall section accuracy.

[0059] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for compensating the accuracy of the deck of a car carrier, characterized in that, When welding the butting joints of the deck, the welding sequence of the deck is to weld the upper deck first and then the lower deck; The width of the butting joints gradually narrows in a stepped manner from the upper deck to the lower deck; When the thickness, assembly deformation coefficient, and welding shrinkage coefficient of all decks are the same, the width change of the butting joints forms a geometric sequence; When the thickness of the deck is a, the gap between adjacent decks is b, the width of the butting joint is x, the number of deck layers is n, and the proportionality coefficient of the geometric sequence is y, the relationship among them from bottom to top is: Among them, the range of y is 0.5 - 0.8‰.

2. The method for compensating the deck accuracy of a pure car carrier according to claim 1, wherein When the assembly deformation coefficient of the deck is greater than that of its upper and lower decks, the width of its butting joint is smaller than that of the normal geometric sequence.

3. The method for compensating the deck accuracy of a pure car carrier according to claim 1, wherein When the welding shrinkage coefficient of the deck is greater than that of its upper and lower decks, the width of its butting joint is smaller than that of the normal geometric sequence.

4. The method for compensating the deck accuracy of a pure car carrier according to claim 1, wherein, The gap between adjacent two decks is the same.

5. The method for compensating the deck accuracy of a pure car carrier according to claim 1, wherein The proportionality coefficient is: y = 0.65‰.

6. The method for compensating the deck accuracy of a pure car carrier according to claim 1, wherein The butting joint of the upper deck is centered and aligned with the butting joint of the lower deck.

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