A method for positioning bulk outer panels

Abstract

The present invention discloses a method for positioning bulk outer plates. The method marks outer plate positioning marks on segmented internal components of a segmented three-dimensional model, and then generates segmented internal component processing drawings using the segmented three-dimensional model with the outer plate positioning marks. The segmented internal components with outer plate positioning holes or outer plate positioning lines can be directly cut out using a numerically controlled machine tool. When constructing segments, there is no need to survey and mark ground lines and other related marks on the ground below the segments. The bulk outer plates can be accurately positioned directly using the outer plate positioning holes or outer plate positioning lines on the segmented internal components, thereby reducing a large amount of auxiliary work and improving the installation accuracy and efficiency of the bulk outer plates, thereby avoiding the occurrence of outer plate gap tolerances and misalignment when the overall assembly is loaded.

Description

Technical Field

[0001] The invention relates to the technical field of shipbuilding, and in particular to a positioning method for bulk outer plates. Background Art

[0002] In modern shipbuilding, most of the section production includes the installation of outer plates. There are currently three ways to install outer plates: 1. For straight outer plates without linear shapes, we usually install them after assembling them; 2. For outer plates with large changes in curvature, we usually manufacture curved frames for such sectioned outer plates (also by assembling the outer plates first and then installing the components); 3. For outer plates with relatively small changes in curvature, we usually use the platform surface as the frame surface for reverse construction, and then scatter the outer plates.

[0003] When positioning and installing the above three types of outer panels, the outer panels close to the platform are usually installed first, and the positioning is carried out from bottom to top. Since there are a large number of these segmented outer panels and there are no other positioning reference objects for direct reference, it is necessary to survey the ground line and other marks before installation. It takes a long time to position each outer panel, and it is easily affected by auxiliary tooling such as scaffolding and steps, resulting in a longer time cycle. If these outer panels cannot be accurately positioned, each outer panel will have a certain installation deviation. The cumulative installation deviation of several outer panels will cause the outer panel gap to exceed the tolerance and misalignment when the total group is loaded. Summary of the invention

[0004] In view of this, the present invention provides a positioning method for bulk outer panels, which can not only eliminate auxiliary positioning work such as surveying and marking ground lines, but also because it can directly determine whether the bulk outer panels are installed in place during positioning and installation, it can effectively shorten the segmented manufacturing cycle and improve the installation accuracy of the bulk outer panels, avoiding secondary correction work after the segmented production is completed.

[0005] A method for positioning bulk outer panels, comprising the following steps:

[0006] S1, constructing a segmented three-dimensional model that needs to be constructed in reverse state in a three-dimensional modeling software;

[0007] S2, marking an outer panel positioning mark on the segmented internal component at the outer panel splicing position of the segmented three-dimensional model, wherein the outer panel positioning mark is set at a position on the segmented internal component corresponding to the outer panel joint;

[0008] S3, generating segmented internal component processing drawings using the segmented 3D model with outer panel positioning marks;

[0009] S4, according to the segment internal component processing drawings, use CNC machine tools to cut and process all the segment internal components;

[0010] S5, reverse manufacturing is performed with the platform as the base surface, all the segmented internal components are assembled into one, and then the bulk outer panels are installed in sequence from bottom to top and from inside to outside, and the outer panel joints of the set width are maintained between two adjacent bulk outer panels, and the outer panel joints at different positions are aligned with the outer panel positioning marks at the corresponding positions.

[0011] Preferably, when marking the outer plate positioning mark on the segmented internal component at the outer plate splicing position of the segmented three-dimensional model in step S2, an outer plate positioning hole can be opened at a position on the segmented internal component corresponding to the outer plate butt joint, or an outer plate positioning line can be drawn on the segmented internal component by constructing a virtual stiffener at the outer plate splicing position.

[0012] Preferably, the outer plate positioning hole is an arc-shaped opening.

[0013] Preferably, the width of the outer panel butt joint is 6-16 mm and is formed with a 20-degree inclined groove.

[0014] Preferably, the three-dimensional modeling software is Tribon M3 or SPD modeling software.

[0015] Preferably, the sections that need to be constructed in reverse state include bilge sections and bow and stern nacelle sections.

[0016] The beneficial effects of the present invention are:

[0017] The present invention marks outer panel positioning marks on the segmented internal components of the segmented three-dimensional model, and then generates segmented internal component processing drawings using the segmented three-dimensional model with the outer panel positioning marks. The segmented internal components with outer panel positioning holes or outer panel positioning lines can be directly cut out using a CNC machine tool. When constructing the segments, there is no need to survey and mark ground lines and other related marks on the ground below the segments. The bulk outer panels can be accurately positioned directly using the outer panel positioning holes or outer panel positioning lines on the segmented internal components, which reduces a large amount of auxiliary work and saves segment production time. At the same time, it also improves the installation accuracy and efficiency of the bulk outer panels, and avoids the occurrence of outer panel gap tolerances and misalignment when the overall assembly is loaded. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram showing the marking of the outer plate positioning marks in the segmented 3D model.

[0020] Figure 2 This is a schematic diagram of the structure of the segmented internal components that have been cut.

[0021] Figure 3 Schematic diagram of assembling bulk outer panels.

[0022] Figure 4 This is a schematic diagram of using outer panel positioning marks to locate the outer panel butt joint position when assembling loose outer panels.

[0023] Figure 5 This is a schematic diagram of the structure of the constructed bilge section.

[0024] The meanings of the numbers in the figure are:

[0025] 1 is the bulk outer plate, 2 is the outer plate butt joint, 3 is the rib plate, 4 is the longitudinal girder, 5 is the outer plate positioning hole, and 6 is the outer plate positioning line. DETAILED DESCRIPTION

[0026] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] It should be clear that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The present application is further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0029] In the description of this specification, it should be understood that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limitations on the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0030] The present invention provides a positioning method for bulk outer plates, which specifically comprises the following steps:

[0031] S1, construct a segmented three-dimensional model that needs to be constructed in reverse state in a three-dimensional modeling software.

[0032] The three-dimensional modeling software is Tribon M3 or SPD modeling software.

[0033] The sections that need to be constructed in reverse state include the bilge section and the bow and stern engine room sections.

[0034] S2, marking an outer panel positioning mark on the segmented internal component at the outer panel splicing position of the segmented three-dimensional model, wherein the outer panel positioning mark is set at a position on the segmented internal component corresponding to the outer panel joint.

[0035] When marking the outer panel positioning mark on the segmented internal component at the outer panel splicing position of the segmented three-dimensional model, an outer panel positioning hole 5 can be opened at a position on the segmented internal component corresponding to the outer panel joint 2, or an outer panel positioning line 6 can be drawn on the segmented internal component by constructing a virtual stiffener at the outer panel splicing position. The outer panel positioning hole 5 or the outer panel positioning line 6 can both be used as an outer panel positioning mark to facilitate the subsequent installation of the bulk outer panel 1.

[0036] The outer plate positioning hole 5 is an arc-shaped opening.

[0037] S3, generate segmented internal component processing drawings using the segmented 3D model with outer panel positioning marks.

[0038] S4, according to the segment internal component processing drawings, use CNC machine tools to cut and process all the segment internal components.

[0039] S5, reverse manufacturing is performed with the platform as the base surface, all the segmented internal components are assembled into one, and then the bulk outer panels are installed in sequence from bottom to top and from inside to outside, and the outer panel butt joint 2 of a set width is maintained between two adjacent bulk outer panels (the width of the outer panel butt joint is 6-16mm and a 20-degree inclined groove is formed), and the outer panel butt joint 2 at different positions is aligned with the outer panel positioning mark at the corresponding position.

[0040] The specific real-time method of the present invention is described in detail below by taking examples.

[0041] Taking the bilge section of a container ship as an example, according to its DAP drawing, it can be known that the bilge section needs to be built in reverse with the platform as the base surface, and its outer plates are all bulk outer plates. Therefore, the method of the present invention can be applied to improve the installation positioning accuracy and installation efficiency of its bulk outer plates.

[0042] Firstly, a three-dimensional model of the bilge section was constructed in the SPD modeling software.

[0043] Then, a shell plate positioning hole is opened at a position corresponding to the shell plate joint on the ribs and longitudinal girders at a specific position on the bilge segment 3D model or a virtual stiffener is constructed to draw the shell plate positioning line. There are 5 equidistantly distributed ribs 3 and many equidistantly distributed longitudinal girders 4 on the bilge segment 3D model. The ribs 3 and longitudinal girders 4 are staggered, but not every rib and longitudinal girders need to be set with a shell plate positioning mark. Only the ribs and longitudinal girders at the shell plate splicing position need to be set with a shell plate positioning mark, and the shell plate positioning mark should be aligned with the shell plate joint 2.

[0044] Then, the segmented three-dimensional model with outer plate positioning marks is used to generate segmented internal component processing drawings. According to the generated drawings, all ribs and longitudinal girders are processed on a CNC machine tool. At this time, the ribs and longitudinal girders at the processed outer plate splicing positions directly carry outer plate positioning holes 5 or outer plate positioning lines 6, and the outer plate positioning lines 6 can be zinc powder lines.

[0045] Then, according to the block construction drawings, the bilge sections are constructed in reverse with the platform as the base surface, and the ribs 3 and longitudinal girders 4 are installed on the platform. After the ribs 3 and longitudinal girders 4 are installed, the bulk outer plates 1 are installed in sequence from bottom to top and from inside to outside, and the outer plate butt joints 2 of about 6 mm are maintained between two adjacent bulk outer plates 1, and the outer plate butt joints 2 at different positions are aligned with the outer plate positioning holes 5 at the corresponding positions.

[0046] The positioning of the front and rear positions of the bulk outer plate 1 can be checked by using a plumb bob to check the overlap.

[0047] The positioning of the internal weld position of each bulk outer plate 1 can be visually checked with the naked eye. There are eight outer plates in this section. Through the precise positioning of each outer plate, the cumulative error is reduced, the operation accuracy and efficiency are improved, and the correction workload after large deviations can be effectively reduced.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for positioning bulk outer panels, characterized in that: The specific steps include: S1, constructing a segmented three-dimensional model that needs to be constructed in reverse state in a three-dimensional modeling software; S2, marking an outer panel positioning mark on the segmented internal component at the outer panel splicing position of the segmented three-dimensional model, wherein the outer panel positioning mark is set at a position on the segmented internal component corresponding to the outer panel joint; The outer plate positioning marks are only set on the ribs and longitudinal girders at the outer plate splicing positions and the outer plate positioning marks should be aligned with the outer plate butt joints; S3, generating segmented internal component processing drawings using the segmented 3D model with outer panel positioning marks; S4, according to the segment internal component processing drawings, use CNC machine tools to cut and process all the segment internal components; S5, reverse manufacturing is performed with the platform as the base surface, all the segmented internal components are assembled into one, and then the bulk outer panels are installed in sequence from bottom to top and from inside to outside, and the outer panel joints of the set width are maintained between two adjacent bulk outer panels, and the outer panel joints at different positions are aligned with the outer panel positioning marks at the corresponding positions.

2. The method for positioning bulk outer panels according to claim 1, characterized in that: When marking the outer plate positioning mark on the segmented internal component at the outer plate splicing position of the segmented three-dimensional model in step S2, an outer plate positioning hole can be opened at a position on the segmented internal component corresponding to the outer plate butt joint, or an outer plate positioning line can be drawn on the segmented internal component by constructing a virtual stiffener at the outer plate splicing position.

3. The method for positioning bulk outer panels according to claim 2, characterized in that: The outer plate positioning hole is an arc-shaped opening.

4. The method for positioning bulk outer panels according to claim 1, characterized in that: The width of the outer plate butt joint is 6-16 mm and is formed with a 20-degree inclined groove.

5. The method for positioning bulk outer panels according to claim 1, characterized in that: The three-dimensional modeling software is Tribon M3 or SPD modeling software.

6. The method for positioning bulk outer panels according to claim 1, characterized in that: The sections that need to be constructed in reverse state include the bilge section and the bow and stern engine room sections.

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