A design method and a jig for the bottom transition section of a bulbous bow

Abstract

The present invention provides a design method and a jig for the bottom transition section of a bulbous bow. By making a part of the traditional upright jig into movable modules, each module is an independent entity and is connected by hinges, and will not be separated from the overall jig, so that the transition gear and the fixed gear jig templates are organically combined. The jig designed by using the design method of the bottom transition section of a bulbous bow provided by the present invention has the characteristics of being able to be restored quickly and accurately. It is simpler in restoration operation and higher in restoration accuracy than the traditional upright jig, and can meet the needs of batch ship rapid continuous production and precision shipbuilding.

Description

Technical Field

[0001] The present invention belongs to the technical field of ships, and particularly relates to a design method and a jig for the bottom transition section of a bulbous bow. Background Art

[0002] As Figure 2 shown, there will be two adjacent transition sections for the hull bulbous bow section, namely the bottom section near the stern and the side section above it. As Figure 3 shown, the projection of the bulbous bow section on the waterline is in the shape of a dripping water droplet. As Figure 4 shown, the transition part of the bottom transition section is above the water droplet to be separated. Since this part is at the junction of the bulbous bow, its section line becomes wider and bulges. The longitudinal and transverse width values of the rib line connecting to the bulbous bow section opening are the largest at this position. For the section line of the bulbous bow transition part with a narrow upper part and a wide lower part, if a direct mounting jig is used for manufacturing, the section cannot be removed from the jig. Unless during the construction of a single-type ship, the jig can be forcibly disassembled to take out the section, but the forced disassembly of the jig is not applicable to the construction of batch ships, and this method is not conducive to the recycling of the jig. Figure 5 shown, currently, such sections are generally manufactured by the inverted mounting method. The inverted construction method uses the platform or deck at the upper opening of the section as the base of the jig, and constructs an internal jig with the transverse rib frame of the hull, and then carries out the section construction. Figure 6 shown, the transverse rib frame is obtained by assembling the transverse members of the hull into a frame. Due to the existence of continuous longitudinal keels and side longitudinal girders in the hull, each transverse member is generally composed of multiple loose parts. To assemble the rib frame, multiple sets of temporary supports for connection in the left-right and up-down directions must be added, which need to be removed after the section construction is completed. This construction method using such a structural frame as an internal jig cannot guarantee the longitudinal and transverse rigidity of the jig because strengthening designs cannot be added arbitrarily. Often, large deformations occur after the overall welding of the section is completed, resulting in difficulties in the subsequent section closing. In addition, multiple sets of internal temporary supports occupy the limited construction space, increasing the difficulty of construction operations. Moreover, when these temporary supports need to be removed after the section construction is completed, the workload is large and the processes are complicated, and the phenomenon of damaging the base material due to improper removal methods occurs frequently. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a design method for the bottom transition section jig of a bulbous bow. Adopting the fixed jig construction technology and the design of a direct mounting jig for the hull section with local mobility, the manufactured jig is firm and reliable, has the characteristics of being reusable multiple times, and is particularly suitable for the construction of hull sections with a narrow upper part and a wide lower part.

[0004] The object of the present invention is achieved through the following technical solutions. A design method for the bottom transition section jig of a bulbous bow includes the following steps:

[0005] Step 1: Extract all the rib lines that are wider at the bottom than at the top according to the sectional rib lines to draw the transverse section of the jig movable module;

[0006] Step 1.1: Determine the dividing line of the jig module:

[0007] Step 1.1.1: Measure the widest part of the "water droplet" line and draw the horizontal tangent line of the maximum contour of the bulbous bow;

[0008] Step 1.1.2: Take the horizontal tangent line of the maximum contour of the bulbous bow as the boundary and divide the jig template into upper and lower parts. Among them, the lower part is the fixed jig module composed of Template 1, and the upper part is the two jig movable modules on the port and starboard sides composed of Template 2.

[0009] Step 1.2: Draw the components of the jig module:

[0010] Step 1.2.1: Draw the base material of the jig.

[0011] Step 1.2.2: Draw the components of the jig movable module: The Template 2 of each rib line of the jig movable module is connected and fixed by multiple groups of longitudinal back strengthening materials, strengthening platforms and single top strengthening materials.

[0012] Step 1.3: Draw the accessories

[0013] Step 1.3.1: Draw the hinge figure at the connection of the upper and lower jig modules;

[0014] Step 1.3.2: Draw the fixed-width crossbar for inspection and temporary fixation at the top of the jig.

[0015] Step 1.4: Determine the height of the bracket for supporting the jig movable module:

[0016] Step 1.4.1: Copy all the rib lines, convert them into dotted lines and draw them into a block. Move this block vertically upward along the center line CL of the hull to simulate the state of the section being removed from the jig. Paste it when the widest part of the bulbous bow reaches the narrowest bottleneck of the line type to obtain the sectional removed-width view;

[0017] Step 1.4.2: Copy all the rib lines and component lines of the jig movable module, convert them into dotted lines, and finally draw them into a block. Rotate this block outward along the hinge axis until the module is separated from the removed-section line block, and then paste it to obtain the rotational opening view of the jig movable module in the state of the section being removed from the jig;

[0018] Step 1.4.3: Take the height value of the second-highest back strengthening material of the jig movable module as the support height, draw the schematic diagram of the support bracket of the jig movable module, and mark the bracket height;

[0019] Step 1.4.4: Draw the U-shaped clamp locking device diagram at the top of the bracket.

[0020] Step 2: Based on the sectional side view and the cross-sectional view of the state where the jig movable module is removed from the hull, draw the side view of the jig movable module.

[0021] Step 2.1: Draw the main body of the jig movable module:

[0022] Step 2.1.1: Offset the rib lines and sectional opening lines in the movable template area by the plate thickness to draw the rib template and the sectional opening template;

[0023] Step 2.1.2: Project the heights of each stiffener and platform plate in the cross-sectional view onto the side view to draw the rear stiffeners, the strengthening platform, and the single top stiffener;

[0024] Step 2.1.3: At the starting point of the line bulge covering the hull lines, draw the vertical port stiffeners;

[0025] Step 2.1.4: In the squares formed by the port stiffeners, the sectional opening template, and each rear stiffener, draw the cross-shaped diagonal braces.

[0026] Step 2.2: Draw the attachments:

[0027] Step 2.2.1: Project the height of the hinge in the cross-sectional view onto the side view to draw the schematic diagram of the hinge installation position;

[0028] Step 2.2.2: Project the height of the constant-width crossbar in the cross-sectional view onto the side view to draw the side projection diagram of the constant-width crossbar.

[0029] So far, the drawing work of the jig movable module is completed.

[0030] Preferably, in Step 1.4.3, the height of the support bracket is designed at the upper part of the jig movable module to obtain a stable support effect, and the style, quantity, and arrangement of the support brackets can be adjusted according to the actual situation.

[0031] Preferably, the constant-width crossbar is arranged at the front end of the sectional opening.

[0032] Preferably, the ship hull lines are designed using the Dongxin Ship Product Design Software; the jig manufacturing uses the test1 jig program; and the post-processing is carried out using the CAD software.

[0033] In addition to providing a design method for the bulbous bow bottom transition sectional jig, the present invention further provides a bulbous bow bottom transition sectional jig, which is manufactured according to the design method provided by the present invention.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] A design method for the bilge keel bottom transition section jig provided by the present invention makes the traditional forward-mounted jig into movable modules locally. Each module is independent and connected by hinges, and will not be separated from the overall jig, so that the transition gear and the fixed gear jig template are organically combined. The jig designed by using the design method for the bilge keel bottom transition section jig provided by the present invention enables the upper-narrow and lower-wide hull section to be smoothly and conveniently removed from the jig, has the characteristics of being able to be quickly and accurately restored, is simpler in restoration operation than the traditional forward-mounted jig, and has a high restoration accuracy, and can meet the needs of batch ship rapid continuous production and precision shipbuilding. The jig designed by using the design method for the bilge keel bottom transition section jig provided by the present invention is firm and reliable. The section built with this jig has a small deformation degree and a higher accuracy than that built with the inverted jig. Compared with other types of jigs, it has the characteristic of being reusable multiple times, thus saving tooling materials and being more likely to achieve the cost reduction goal. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is the flow chart of the steps of the present invention;

[0037] Figure 2 is a side view of the bottom section near the stern and the side section above it in the prior art;

[0038] Figure 3 is a projection view of the bulbous bow section on the water plane in the prior art;

[0039] Figure 4 is the sectional rib line drawing of the bottom transition section in the prior art;

[0040] Figure 5 is a schematic diagram of the inverted jig in the prior art;

[0041] Figure 6 is an assembly drawing of the ribbed plate frame in the prior art;

[0042] Figure 7 is a schematic diagram of the forward-mounted jig template of the present invention;

[0043] Figure 8 is a cross-sectional view of the jig movable module in the state of being removed from the jig of the present invention;

[0044] Figure 9 is a side view of the jig movable module of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only the parts related to the present invention are shown in the drawings, rather than all the structures.

[0046] As Figure 1 shown, in the technical solution of the present invention, a design method for the transition section jig of the bulbous bow bottom is provided, including the following steps:

[0047] Step 1: According to Figure 4 the sectional rib line diagram shown, extract all the rib lines that are narrow at the top and wide at the bottom for drawing the cross-sectional view of the jig movable module in the state of being separated from the mold.

[0048] Step 1.1: Obtain the jig module dividing line:

[0049] Step 1.1.1: Measure the widest part of the "water droplet" line and make a horizontal tangent line of the maximum contour of the bulbous bow.

[0050] Step 1.1.2: Take the horizontal tangent line of the maximum contour of the bulbous bow as the boundary, divide the jig template into upper and lower parts. Among them, the lower part is the fixed jig module composed of Template 1, and the upper part is the two jig movable modules on the left and right sides composed of Template 2.

[0051] Step 1.2: Draw the jig module components:

[0052] Step 1.2.1: Draw the jig base material

[0053] Step 1.2.2: Draw the jig movable module components: The Template 2 of each rib line of each jig movable module is connected and fixed by multiple groups of longitudinal back strengthening materials, strengthening platforms and single top strengthening materials.

[0054] Step 1.3: Draw the accessories

[0055] Step 1.3.1: Draw a hinge figure at the connection of the upper and lower jig modules;

[0056] Step 1.3.2: Draw a fixed-width cross bar for detection and temporary fixation at the top of the jig.

[0057] Step 1.4: Obtain the height of the bracket for supporting the jig movable module

[0058] Step 1.4.1: Copy all the rib lines, convert them into dotted lines and draw them into a block. Move this block vertically upward along the ship center line CL to simulate the state of the section being separated from the mold. Paste it when the widest part of the bulbous bow reaches the narrowest bottleneck of the line type to obtain the sectional width view in the state of being separated from the mold.

[0059] Step 1.4.2: Copy all the rib lines and component lines of the jig movable module, convert them into dotted lines, and finally draw them into a block. Rotate this block outward along the hinge axis until the module is separated from the block of the separation section line, and then paste it to obtain the rotation opening diagram of the jig movable module in the state of being separated from the mold.

[0060] Step 1.4.3: Take the height value of the secondary highest back reinforcement of the movable module of the jig as the support height, draw a schematic diagram of the support bracket of the movable module of the jig, and mark the bracket height;

[0061] Step 1.4.4: Draw a diagram of the U-shaped clamp locking device on the top of the bracket.

[0062] The cross-sectional view of the movable module of the jig in the state of being separated from the jig is as Figure 8 shown.

[0063] Step 2: According to the Figure 2 shown sectional side view and the Figure 8 shown cross-sectional view of the movable module of the jig in the state of being separated from the jig, draw the side view of the movable module of the jig.

[0064] Step 2.1: Draw the main body of the movable module of the jig:

[0065] Step 2.1.1: Offset the rib lines and sectional joint lines of the movable template area by the plate thickness to draw the rib template and the sectional joint template;

[0066] Step 2.1.2: Project the heights of each reinforcement and platform plate in the cross-sectional view onto the side view to draw the back reinforcement, the reinforcement platform and the single top reinforcement;

[0067] Step 2.1.3: Draw a vertical port reinforcement at the starting point of the bulging of the covered profile line;

[0068] Step 2.1.4: Draw cross-shaped diagonal braces in the squares formed by the port reinforcement, the sectional joint template and each back reinforcement.

[0069] Step 2.2: Draw the accessories:

[0070] Step 2.2.1: Project the hinge height in the cross-sectional view onto the side view to draw a schematic diagram of the hinge installation position;

[0071] Step 2.2.2: Project the height of the constant-width crossbar in the cross-sectional view onto the side view to draw the side projection diagram of the constant-width crossbar.

[0072] The side view of the movable module of the jig obtained is as Figure 9 shown.

[0073] So far, the drawing work of the movable module of the jig is completed.

[0074] In some embodiments of the invention, in Step 1.4.3, the support bracket height is designed at the upper part of the movable module of the jig to obtain a stable support effect, and the style, quantity and arrangement of the support brackets can be adjusted according to the actual situation.

[0075] In some embodiments of the present invention, the constant-width crossbar is arranged at the front end of the sectional joint.

[0076] In some embodiments of the present invention, in the above-mentioned jig design method, the hull lines are designed using Dongxin Ship Product Design Software; the jig is fabricated using the test1 jig program; and the post-processing is carried out using CAD software.

[0077] In the technical solution of the present invention, in addition to providing a design method for the bulbous bow bottom transition section jig, a bulbous bow bottom transition section jig constructed using the above design method is further provided.

[0078] By locally fabricating the traditional upright jig into movable modules, the local jig movable modules are made into separate entities and connected by hinges, and they will not be separated from the overall jig, enabling the organic combination of the transition gear and the fixed gear jig templates. This jig has the characteristics of being able to be quickly and accurately restored, with a simpler restoration operation and higher restoration accuracy than the traditional upright jig, thus meeting the needs of batch ship rapid continuous production and precision shipbuilding.

[0079] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A design method for the jig of the bottom transition section of a bulbous bow, characterized in that: The described design method includes the following steps: Step 1: Extract all the rib lines that are narrower at the top and wider at the bottom according to the sectional rib lines to draw the cross-sectional view of the movable module of the jig; Step 1.1: Obtain the dividing line of the jig module: Step 1.1.1: Measure the widest part of the "water droplet" line and make the horizontal tangent line of the maximum contour of the bulbous bow; Step 1.1.2: Take the horizontal tangent line of the maximum contour of the bulbous bow as the boundary, divide the jig template into upper and lower parts. Among them, the lower part is the fixed module of the jig composed of Template 1, and the upper part is the two movable modules of the port and starboard sides composed of Template 2; Step 1.2: Draw the components of the jig module Step 1.2.1: Draw the bottom material of the jig Step 1.2.2: Draw the components of the movable module of the jig: The Template 2 of each rib line of the movable module of the jig is connected and fixed by multiple groups of longitudinal back strengthening materials, strengthening platforms and single top strengthening materials; Step 1.3: Draw the accessories Step 1.3.1: Draw the hinge pattern at the connection of the upper and lower jig modules; Step 1.3.2: Draw the constant-width crossbar for inspection and temporary fixation at the top of the jig; Step 1.4: Obtain the height of the bracket for supporting the movable module of the jig Step 1.4.1: Copy all the rib lines, convert them into dotted lines and draw them into a block, move this block vertically upward along the center line CL of the hull to simulate the state of the section being removed from the jig. When the widest part of the bulbous bow reaches the narrowest bottleneck of the line type, paste it to obtain the sectional view of the width after being removed from the jig; Step 1.4.2: Copy all the rib lines and component lines of the movable module of the jig, convert them into dotted lines, and finally draw them into a block. Rotate this block outward along the hinge axis until the module is disengaged from the removed sectional line block, and then paste it to obtain the rotation opening diagram of the movable module of the jig in the state of being removed from the jig; Step 1.4.3: Take the height value of the second-highest back strengthening material of the movable module of the jig as the support height, draw the schematic diagram of the support bracket of the movable module of the jig, and mark the height of the bracket; Step 1.4.4: Draw the diagram of the U-shaped clamp locking device at the top of the bracket; Step 2: Draw the side view of the movable module of the jig according to the sectional side view and the cross-sectional view of the movable module of the jig in the state of being removed from the jig Step 2.1: Draw the main body of the movable module of the jig: Step 2.1.1: Offset the rib lines and sectional opening lines in the movable template area by the plate thickness to draw the rib template and the sectional opening template; Step 2.1.2: Project the heights of each strengthening material and platform plate in the cross-sectional view onto the side view to draw the back strengthening material, the strengthening platform and the single top strengthening material; Step 2.1.3: Draw the vertical port strengthening material at the starting point of the line type bulge; Step 2.1.4: Draw the cross-shaped diagonal bracing materials in the squares formed by the port strengthening material, the sectional opening template and each back strengthening material; Step 2.2: Draw the accessories: Step 2.2.1: Project the hinge height in the cross-sectional view onto the side view to draw the schematic diagram of the hinge installation position; Step 2.2.2: Project the height of the constant-width crossbar in the cross-sectional view onto the side view to draw the side projection diagram of the constant-width crossbar; So far, the design and drawing work of the movable module of the jig is completed.

2. The design method for the jig of the bottom transition section of a bulbous bow according to claim 1, characterized in that: In step 1.4.3, the height of the support bracket is designed above the movable module of the jig, and the style, quantity and arrangement of the support brackets can be adjusted according to the actual situation.

3. The design method for the jig of the bottom transition section of a bulbous bow according to claim 1, characterized in that: The width-fixed cross bar is arranged at the front end of the sectional opening.

4. A jig for the bottom transition section of a bulbous bow, characterized in that: The jig is manufactured according to the design method of the bulbous bow bottom transition sectional jig as described in any one of claims 1-3.

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