Manufacturing method of steel structure of glass fiber reinforced plastic bulbous bow fairing

Abstract

The invention discloses a manufacturing method of a steel structure of a glass fiber reinforced plastic bulbous bow fairing, and the method specifically comprises the following steps: S1, fairing assembly division: dividing the fairing into a bulkhead middle assembly, a bottom middle assembly and a sonar deck middle assembly; s2, building a bulkhead middle assembly: building the bulkhead middle assembly by taking the bulkhead as a base plane; bottom middle assembly construction, wherein the bottom middle assembly is normally constructed with the outer plate as the base plane; s3, a sonar deck middle assembly is built, and the sonar deck middle assembly is built on the jig frame with the sonar deck as the base plane; s4, a positioning deck is installed according to the projected sonar deck line position, and radial ribs are installed according to the marked radial rib position lines; s5, marking out a radial rib allowance cutting line on the radial rib; and S6, the assemblies are folded, and construction of the steel structure of the air guide sleeve is completed. According to the invention, the positioning of the radial ribs is based on lineation, so that the positioning precision is improved; the allowance of the radial rib is subjected to lineation cutting by adopting a sample plate, so that the linetype precision is improved.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding technology, and in particular relates to a method for manufacturing the steel structure of a fiberglass bulb nose fairing. Background Technology

[0002] A bulbous bow is a special structure installed at the bow of a ship to reduce water resistance. This structure is widely used in commercial vessels and naval ships. Modern ships typically use a fairing in conjunction with a bulbous bow to mount sonar systems. Generally, a ship's bulbous bow fairing has a steel frame structure with an outer layer of fiberglass reinforced plastic (FRP). FRP bulbous bow fairings are widely used in displacement surface ships, such as frigates, military aid projects, and military trade vessels. The design of the FRP bulbous bow fairing reduces water resistance and noise, protects the sonar transducer, and possesses excellent acoustic performance, a sleek shape, and sufficient structural strength.

[0003] To meet acoustic performance requirements and provide sufficient structural strength, the steel structure of a fiberglass bulbous bow fairing is typically designed with a radial framework passing through the acoustic center. Due to the high precision requirements of the bulbous bow's profile, the positioning of the radial structure is difficult and time-consuming, posing significant challenges to the construction of the steel structure. This results in generally low construction efficiency and difficulty in guaranteeing construction quality. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for manufacturing the steel structure of a fiberglass bulb nose fairing. The method of this invention improves the positioning accuracy by using scribing lines as a reference for the positioning of radial ribs; and improves the line shape accuracy by using templates for scribing and cutting the excess of radial ribs.

[0005] To achieve the above-mentioned objectives, the technical solution provided by this invention patent is as follows: A method for manufacturing the steel structure of a fiberglass bulb nose cone fairing, the method specifically includes the following steps: S1, fairing assembly division, dividing the fairing into bulkhead mid-assembly, bottom mid-assembly and sonar deck mid-assembly; S2, Bulkhead In-Bulk Component Construction: Constructing bulkhead in-bulk components using the bulkhead as the base surface; Bottom In-Bulk Component Construction: Normally constructing bottom in-bulk components using the outer plate as the base surface. S3, Construction of sonar deck components: The sonar deck components are constructed on the jig with the sonar deck as the base surface. Positioning lines are drawn on the jig base surface. Based on the line template of the sonar deck components, the sonar deck lines and horizontal girder position lines of the sonar deck components are projected onto the jig base surface, and radial rib position lines are drawn on the jig base surface. S4, Install the positioning deck according to the position of the sonar deck line projected, install the radial ribs according to the marked radial rib position lines, and install the horizontal ribs according to the horizontal rib position lines and height position. S5, Draw the radial rib allowance cutting line on the radial rib, draw the horizontal truss allowance cutting line on the horizontal truss, and cut the allowance according to the position of the cutting line. S6, Component assembly: The components in the bulkhead are hoisted onto the frame and assembled in reverse with the components in the sonar deck; the bottom components are hoisted onto the frame and assembled in reverse with the components in the sonar deck, completing the steel structure construction of the fairing.

[0006] Furthermore, the bottom middle component is constructed in a normal manner, and its frame is a curved line frame, the line of which matches the line of the bottom middle component.

[0007] Furthermore, the radial rib allowance cutting line includes a theoretical surface cutting line and a thickness surface cutting line. Using 3D design software, combined with the hull profile and the location of the radial rib, the theoretical surface profile of the radial rib is sectioned. The profile range is slightly larger than that of the radial rib. A wooden template is made based on the profile obtained from the section, and a waterline and width positioning line at the same height as the radial rib are drawn on the wooden template. The positioning lines on the wooden template are aligned with the radial positioning lines. According to the profile of the wooden template, the allowance cutting line is drawn on the radial rib. The method for making the horizontal girder wooden template is the same as that for the radial rib wooden template. The positioning lines of the horizontal girder wooden template are the hull centerline and the rib line. The positioning lines of the wooden template are aligned with the positioning lines of the horizontal girder, and the allowance cutting line is drawn on the horizontal girder according to the profile of the wooden template.

[0008] Furthermore, the positioning lines include the hull centerline, the rib lines, and the acoustic centerline, and the horizontal girder position lines include the first horizontal girder and the second horizontal girder.

[0009] Furthermore, the radial ribs and horizontal truss templates are inspected for the smoothness of the line shape and the matching degree with the theoretical line shape after the allowance cutting is checked. The positioning lines of the radial rib wooden templates are aligned with the radial rib positioning lines, and the templates are fastened outside the radial ribs to check the linearity of the radial ribs. The positioning lines of the horizontal truss wooden templates are aligned with the horizontal truss positioning lines, and the templates are fastened outside the horizontal truss to check the linearity of the horizontal truss.

[0010] Based on the above technical solution, the method for manufacturing the steel structure of a fiberglass bulb nose cone according to this invention patent has achieved the following technical advantages through practical application: 1. The present invention discloses a method for manufacturing the steel structure of a fiberglass bulb nose fairing. The positioning accuracy of the radial ribs is improved by using scribing as a reference for positioning; the allowance of the radial ribs is improved by using templates for scribing and cutting.

[0011] 2. The present invention discloses a method for manufacturing the steel structure of a fiberglass bulb nose fairing. By rationally dividing the steel structure into three intermediate components, the high-altitude operation and overhead welding operations are reduced, which is conducive to improving the construction quality. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the fairing in the manufacturing method of the steel structure of the fiberglass bulb nose fairing of the present invention.

[0013] Figure 2 This is a scribing diagram of the fairing in the manufacturing method of the steel structure of a fiberglass bulb nose fairing according to the present invention.

[0014] Figure 3 This is a diagram showing the radial rib allowance cutting in the manufacturing method of the steel structure of a fiberglass bulb nose shield according to the present invention.

[0015] Figure 4 This is a schematic diagram of the radial rib allowance cutting line in the manufacturing method of the steel structure of a fiberglass bulb nose shield according to the present invention. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the following description is provided with reference to the accompanying drawings. The invention is described using specific examples shown. However, it should be understood that these descriptions are merely exemplary. This description is intended not to limit the scope of the invention. Furthermore, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the invention.

[0017] like Figure 1-4 As shown, a method for manufacturing the steel structure of a fiberglass bulb nose cone fairing includes the following steps: S1, fairing assembly division: the fairing is divided into bulkhead middle assembly 1, bottom middle assembly 2 and sonar deck middle assembly 3; S2, Constructing the bulkhead component 1, constructing the bulkhead component 1 with the bulkhead as the base surface; Constructing the bottom component 2, constructing the bottom component 2 normally with the outer plate 81 as the base surface; S3, the construction of sonar deck component 3: the sonar deck component 3 is constructed on the jig with the sonar deck as the base surface. The positioning line is drawn on the jig base surface. According to the line template of the sonar deck component 3, the sonar deck line 61 and the horizontal girder position line of the sonar deck component 3 are projected onto the jig base surface, and the radial rib position line is drawn on the jig base surface. S4, install the positioning deck according to the position of the sonar deck line 61 projected, install the radial ribs 4 according to the marked radial rib position lines, and install the horizontal ribs 5 according to the horizontal rib position lines and height positions. S5, draw the radial rib allowance cutting line on the radial rib 4, draw the horizontal rib allowance cutting line on the horizontal rib 5, and cut the allowance according to the position of the cutting line. S6, Component assembly: Component 1 in the bulkhead is hoisted to the frame and assembled in reverse with Component 3 in the sonar deck; Component 2 in the bottom is hoisted to the frame and assembled in reverse with Component 3 in the sonar deck, completing the steel structure construction of the fairing.

[0018] The bottom middle component 2 is constructed in a normal manner, and its frame is a curved line frame, the line of which matches the line of the bottom middle component 2.

[0019] The radial rib allowance cutting lines include theoretical surface cutting lines 71 and thickness surface cutting lines 72. Using 3D design software, combined with the hull line and the location of the radial rib 4, the theoretical surface line of the radial rib is sectioned. The line range is slightly larger than that of the radial rib 4. A wooden template is made based on the line obtained from the section, and a waterline and width positioning line at the same height as the radial rib 4 are drawn on the wooden template. The positioning lines on the wooden template are aligned with the radial positioning lines. According to the line of the wooden template, allowance cutting lines are drawn on the radial rib 4. The method for making the horizontal girder wooden template is the same as that for the radial rib 4 wooden template. The positioning lines of the horizontal girder wooden template are the hull centerline 64 and the rib line. The positioning lines of the wooden template are aligned with the positioning lines of the horizontal girder 5, and allowance cutting lines are drawn on the horizontal girder 5 according to the line of the wooden template.

[0020] The positioning lines include the hull centerline 64, the rib lines, and the acoustic centerline 65, and the horizontal girder position lines include the first horizontal girder 62 and the second horizontal girder 63.

[0021] The radial rib 4 and the horizontal truss template are inspected for the smoothness of the line shape and the matching degree with the theoretical line shape after the allowance is cut. The positioning line of the radial rib wooden template is aligned with the radial rib positioning line, and the template is fastened outside the radial rib 4 to check the linearity of the radial rib. The positioning line of the horizontal truss wooden template is aligned with the horizontal truss positioning line, and the template is fastened outside the horizontal truss to check the linearity of the horizontal truss.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, the scope of the invention is not limited to this. Those skilled in the art should understand that modifications can still be made to the specific implementation of the invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solution claimed in the present invention.

Claims

1. A method for manufacturing the steel structure of a fiberglass bulb nose cone fairing, characterized in that, The method specifically includes the following steps: S1, fairing assembly division, dividing the fairing into bulkhead mid-assembly, bottom mid-assembly and sonar deck mid-assembly; S2, Bulkhead In-Bulk Component Construction: Constructing bulkhead in-bulk components using the bulkhead as the base surface; Bottom In-Bulk Component Construction: Normally constructing bottom in-bulk components using the outer plate as the base surface. S3, Construction of sonar deck components: The sonar deck components are constructed on the jig with the sonar deck as the base surface. Positioning lines are drawn on the jig base surface. Based on the line template of the sonar deck components, the sonar deck lines and horizontal girder position lines of the sonar deck components are projected onto the jig base surface, and radial rib position lines are drawn on the jig base surface. S4, Install the positioning deck according to the position of the sonar deck line projected, install the radial ribs according to the marked radial rib position lines, and install the horizontal ribs according to the horizontal rib position lines and height position. S5, Draw the radial rib allowance cutting line on the radial rib, draw the horizontal truss allowance cutting line on the horizontal truss, and cut the allowance according to the position of the cutting line. S6, Component assembly: The components in the bulkhead are hoisted onto the frame and assembled in reverse with the components in the sonar deck; the bottom components are hoisted onto the frame and assembled in reverse with the components in the sonar deck, completing the steel structure construction of the fairing.

2. The method for manufacturing the steel structure of a fiberglass bulb nose cone according to claim 1, characterized in that, The bottom component is constructed in a normal manner, and its frame is a curved line frame, the line of which matches the line of the bottom component.

3. The method for manufacturing the steel structure of a fiberglass bulb nose cone according to claim 1, characterized in that, The radial reinforcement allowance cutting lines include theoretical surface cutting lines and thickness surface cutting lines. Using 3D design software, combined with the hull line and the location of the radial reinforcement, the theoretical surface line of the radial reinforcement is sectioned. The line range is slightly larger than that of the radial reinforcement. A wooden template is made based on the line obtained from the section, and the waterline and width positioning line at the same height as the radial reinforcement are drawn on the wooden template. The positioning lines on the wooden template are aligned with the positioning lines on the radial line. According to the line of the wooden template, the allowance cutting lines are drawn on the radial reinforcement. The method for making the horizontal girder wooden template is the same as that for the radial reinforcement wooden template. The positioning lines of the horizontal girder wooden template are the hull centerline and the rib line. The positioning lines of the wooden template are aligned with the positioning lines of the horizontal girder, and the allowance cutting lines are drawn on the horizontal girder according to the line of the wooden template.

4. The method for manufacturing the steel structure of a fiberglass bulb nose cone according to claim 1, characterized in that, The positioning lines include the hull centerline, the rib lines, and the acoustic centerline; the horizontal girder position lines include the first horizontal girder and the second horizontal girder.

5. The method for manufacturing the steel structure of a fiberglass bulb nose cone according to claim 1, characterized in that, The radial ribs and horizontal truss templates are inspected for the smoothness of the line shape and the matching degree with the theoretical line shape after the allowance is cut. The positioning lines of the radial rib wooden templates are aligned with the radial rib positioning lines, and the templates are fastened outside the radial ribs to check the linearity of the radial ribs. The positioning lines of the horizontal truss wooden templates are aligned with the horizontal truss positioning lines, and the templates are fastened outside the horizontal truss to check the linearity of the horizontal truss.

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