A manufacturing method of a long rod type thin-walled cone cylinder with ribs

Abstract

The application provides a manufacturing method of a long rod type thin-walled conical cylinder with ribs, comprising the following steps: dividing the conical cylinder into multiple cylinder segments and performing coiling on a plate coiling machine; assembling and welding L-shaped reinforcing ribs in the cylinder segments, the L-shaped reinforcing ribs being equal in length to the cylinder segments and extending 40-60mm beyond the small end of the cylinder segment, and then assembling and welding arc-shaped rib strips to form annular ribs; and sequentially assembling and welding other cylinder segments. The manufacturing method of the long rod type thin-walled conical cylinder with ribs divides the conical cylinder into segments, utilizes reasonable assembly and welding sequences to create favorable welding conditions, and realizes the manufacturing of a large-size conical cylinder body with longitudinal and annular inner reinforcing ribs; the overall continuity of the reinforcing ribs in the cylinder body is good, the welding deformation is small, and the welding quality is high.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and more specifically, to a method for manufacturing a long rod-shaped, ribbed, thin-walled conical cylinder. Background Technology

[0002] Ships need to communicate with shore-based base stations in real time while in motion, and antennas are crucial to communication effectiveness, quality, and security. The main shaft of the communication antenna, a long, ribbed, thin-walled conical structure, serves as the mounting base for the ship's communication system and is the hub for information transmission.

[0003] To ensure the accuracy of antenna installation and its performance, the main shaft must maintain a verticality deviation of no more than 20′, and the ellipticity of the cylinder at any position must not exceed 1.5%D of the corresponding position. Given the antenna main shaft's length of 6m and the confined internal space—with a minimum cylinder diameter of only 280mm—and the presence of 8 rows of 60mm high L-shaped reinforcing ribs and 11 rings of ribs inside the cylinder, welding these internal longitudinal and ring reinforcing ribs presents a significant challenge.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] The problem solved by this invention is how to manufacture a large-sized conical cylinder with longitudinal circumferential reinforcing ribs.

[0006] To address the above problems, this invention provides a method for manufacturing a long-rod type ribbed thin-walled conical cylinder. The inner wall of the conical cylinder is provided with multiple L-shaped reinforcing ribs and annular ribs. The L-shaped reinforcing ribs extend along the central axis of the conical cylinder, and the annular ribs are concentrically arranged with the conical cylinder. The method includes:

[0007] S1. Divide the cone into N sections: 1#, 2#, 3#, ..., n#, including the first and second sections that are set up adjacently. Roll each section on a plate rolling machine.

[0008] S2. Evenly assemble the L-shaped reinforcing ribs corresponding to the first cylinder section onto the inner wall of the first cylinder section. The L-shaped reinforcing ribs extend along the central axis of the first cylinder section. The length of the L-shaped reinforcing ribs is equal to that of the first cylinder section, and one end extends 40-60mm beyond the small end of the first cylinder section. Weld the fillet weld between them. Assemble and weld multiple arc-shaped ribs sequentially onto the inner wall of the first cylinder section. The multiple arc-shaped ribs together form a ring rib.

[0009] S3. Position weld the L-shaped reinforcing ribs corresponding to the second cylinder section to the ends of the L-shaped reinforcing ribs corresponding to the first cylinder section to ensure that the straightness of the connected L-shaped reinforcing ribs meets the requirements.

[0010] The second cylindrical section is fitted onto the outside of the L-shaped reinforcing rib and moved toward the first cylindrical section; when the distance between the second cylindrical section and the first cylindrical section is 90-110mm, the multiple arc-shaped ribs are positioned on the second cylindrical section to form a ring rib.

[0011] After the second cylinder section is moved to one side of the first cylinder section until the distance between them is 3-4mm, the two sections are tack welded and then butt welded. After that, the L-shaped reinforcing rib is welded to the second cylinder section with fillet weld, and the annular rib is welded.

[0012] S4. Following the above sequence, complete the welding and assembly of the other cylinder sections on the side of the second cylinder section away from the first cylinder section.

[0013] By following the assembly and welding sequence of L-shaped reinforcing ribs butt-L-shaped reinforcing ribs-circumferential seam butt-longitudinal ribs to cylinder sections-circumferential ribs to cylinder sections, the overall continuity of the cylinder and reinforcing ribs can be guaranteed, and welding deformation can be effectively controlled.

[0014] Preferably, the two ends of the cone are respectively provided with an upper flange and a lower flange. The upper flange is connected to section 1, and the lower flange is connected to section n. The manufacturing method further includes: the L-shaped reinforcing rib corresponding to section n is welded to the upper flange by plug welding, and the L-shaped reinforcing rib corresponding to section 1 is directly welded to the lower flange.

[0015] Since there is no space for direct welding between the L-shaped reinforcing rib corresponding to section n# and the upper flange, while there is sufficient space between the L-shaped reinforcing rib corresponding to section 1# and the lower flange, the welding type can be selected according to the structural characteristics, resulting in a high welding effect.

[0016] Preferably, the value of n is 6-12. Segmentation is performed according to the principle of facilitating manual argon arc welding of internal reinforcing ribs, thus balancing assembly efficiency and quality.

[0017] Preferably, the manufacturing method further includes: the cone is divided into an upper end and a lower end, wherein the upper section is composed of cylinder section 3, cylinder section 4...n cylinder section, and the lower section is composed of cylinder section 1 and cylinder section 2, and the upper and lower sections are assembled and welded off-site.

[0018] Preferably, the cylindrical section and the arc-shaped rib and / or L-shaped rib in step S2 are welded by manual tungsten inert gas welding.

[0019] Preferably, the cylindrical section and the arc-shaped rib are welded on one side and formed on both sides.

[0020] Preferably, the L-shaped reinforcing rib extends 50mm beyond the small end of the i# cylindrical section. This arrangement allows for direct and secure connection between the various cylindrical sections, resulting in high assembly strength.

[0021] Preferably, the cone is made of titanium alloy. As an example of the present invention, the titanium alloy is TA5 alloy, which has strong corrosion resistance and its strength meets the communication requirements of ships. Preferably, the long rod-shaped ribbed thin-walled cone is the main shaft of a ship's antenna.

[0022] Compared with the prior art, the manufacturing method of the long rod type ribbed thin-walled conical cylinder of the present invention has the following beneficial effects: 1) The conical cylinder is segmented, and a reasonable assembly and welding sequence is used to create favorable welding conditions to realize the manufacturing of a large-size conical cylinder with longitudinal circumferential reinforcing ribs; 2) The L-shaped reinforcing ribs in the cylinder have good overall continuity, less welding deformation, and high welding quality; 3) The structural strength of the cylinder is reliable and its performance is better than that of casting, and it is economical. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the antenna spindle structure according to an embodiment of the present invention;

[0024] Figure 2 This is a longitudinal cross-sectional view of the antenna main shaft according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic cross-sectional view of the antenna main shaft according to an embodiment of the present invention.

[0026] Figure 4 Assembly cross-sectional view of the cylindrical section, L-shaped reinforcing rib, and annular rib described in the embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the assembly process of the first and second cylindrical sections according to an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the butt joint of the first and second cylinder sections after assembly in an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1-Cylindrical section; 11-First cylindrical section; 12-Second cylindrical section; 2-L-shaped reinforcing rib; 3-Annular rib; 31-Arc-shaped rib; 4-Upper flange; 5-Lower flange; 6-Butt joint. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other.

[0032] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0033] The ship's antenna main shaft is a long rod-shaped, ribbed, thin-walled conical structure. It is the hub for information transmission. Because it is installed at the highest point of the ship, it is greatly affected by the ship's pitch and roll. Its strength and rigidity need to be greatly enhanced. Usually, eight rows of longitudinal ribs are set inside the main shaft to greatly enhance the strength of the entire main shaft structure and prevent the main shaft from breaking during use. Obviously, its assembly accuracy will affect the antenna's communication performance.

[0034] Similar manufacturing methods for cylindrical bodies have been continuously reported. For example, Chinese Patent Application No. 201811456677.0 discloses a method for manufacturing a cylindrical body with inwardly reinforcing rings, used to produce cylindrical bodies with inwardly reinforcing rings. However, this method has a limited range of cylindrical body length and cannot be used to produce conical cylinders, especially conical cylinders with both annular and longitudinal reinforcing rings on the inner wall. Chinese Patent Application No. 201820622364.7 discloses an automatic assembly and welding workstation for cylindrical body reinforcing rings, which can realize the welding of individual specific cylindrical bodies, rather than conical cylinders, to internal reinforcing rings. Chinese Patent Application No. 201710727963.5 discloses a casting mold and casting method for long cylindrical cast iron parts with internal ribs, which can realize the manufacturing of relatively long internally ribbed cylindrical bodies, but the material properties of the casting are far from meeting the requirements for use. Chinese patent application number 201910463990.5 discloses a method for constructing a segmented large conical cylinder to solve the problems of large conical cylinders (such as a total length of 13m and an inner diameter of 7-9m) having large segment diameters that cannot be directly processed and formed, the processing accuracy cannot be guaranteed, and the welding deformation is difficult to control; however, the inner diameter of this type of cylinder is large, and the welding of its internal ribs is easy to achieve.

[0035] To address the challenge of welding and assembling the elongated, narrow communication antenna main shaft—a long, rod-shaped, ribbed, thin-walled conical structure—the applicant proposes the following technical solution:

[0036] For ease of explanation, the structure of the main shaft of the ship communication antenna is described as follows: The antenna shaft is a long rod-shaped thin-walled conical structure with ribs. Its internal space is narrow and its length can reach 6.4m, with a base of 1.24m. Usually, an upper flange 4 and a lower flange 5 are respectively set at both ends of the conical cylinder. The diameter of the upper flange 4 is smaller than that of the lower flange 5. n cylindrical sections 1 are set between the upper flange 4 and the lower flange 5. The interior of each cylindrical section 1 is hollow and its diameter gradually narrows. One end of each cylindrical section 1 has a large opening and the other end has a small opening. The end with the small opening is defined as the small opening end. The interior of the cone is uniformly distributed with eight rows of L-shaped reinforcing ribs 2, each 60 mm high, and eleven ring-shaped ribs 3. The ring-shaped ribs 3 are formed by sequentially splicing and assembling eight arc-shaped ribs 31. The L-shaped reinforcing ribs 2 extend along the central axis of the cylinder 1, and the bent portion of the L-shaped reinforcing ribs 2 is located away from the inner wall of the cylinder 1. The cylinder section 1 includes a first cylinder section 11 and a second cylinder section 12 arranged adjacent to each other, and a butt joint 6 is formed between the first cylinder section 11 and the second cylinder section 12. Example 1

[0037] like Figure 1-6 As shown, a method for manufacturing a long-rod type ribbed thin-walled conical cylinder structure includes the following steps:

[0038] S1. Divide the antenna main shaft into upper and lower sections. The upper section includes sections 3-10, with the diameter of sections 3, 4, 5, 6, 7, 8, 9, and 10 gradually decreasing. Each section is 55cm long. The lower section includes sections 1 and 2, with the diameter of sections 1 and 2 gradually decreasing. Each section is 80cm long. Roll each section on a plate rolling machine.

[0039] S2. The L-shaped reinforcing ribs 2 corresponding to the No. 3 cylinder section are evenly assembled onto the inner wall of the No. 3 cylinder section along the central axis of the No. 3 cylinder section. The L-shaped reinforcing ribs 2 extend along the central axis of the No. 3 cylinder section. The length of the L-shaped reinforcing ribs 2 is equal to that of the No. 3 cylinder section and extends 40mm beyond the small end of the No. 3 cylinder section. The fillet weld between the L-shaped reinforcing ribs 2 and the No. 3 cylinder section is welded by manual tungsten inert gas welding.

[0040] Multiple arc-shaped ribs 31 are sequentially assembled on the inner wall of section 3. The multiple arc-shaped ribs 31 form annular ribs 3. The annular ribs 3 are then welded by manual tungsten inert gas welding with single-sided welding and double-sided forming.

[0041] S3. Position weld the L-shaped reinforcing rib 2 corresponding to section 4 to the end of the L-shaped reinforcing rib 2 corresponding to section 3, ensuring that the straightness of the connected L-shaped reinforcing rib 2 meets the requirements.

[0042] The 4# cylinder section is placed on the outside of the L-shaped reinforcing rib 2 and moved towards the 3# cylinder section; when the distance between the 3# cylinder section and the 4# cylinder section is 110mm, the multiple arc-shaped reinforcing bars 31 are positioned and welded onto the 4# cylinder section to form a ring-shaped reinforcing bar 3;

[0043] After the No. 4 cylinder section was moved to a distance of 3mm between the two sections, the two sections were tack welded together, and then the butt joint 6 was welded. After that, the fillet weld between the L-shaped reinforcing rib 2 and the No. 4 cylinder section was welded by manual tungsten inert gas welding, and the annular rib 3 was welded by single-sided welding and double-sided forming welding.

[0044] S4. Complete the welding and assembly of sections 5 to 10 and sections 1 and 2 of the lower section in the above order.

[0045] By following the assembly and welding sequence of L-shaped reinforcing rib 2 to L-shaped reinforcing rib 2, circumferential seam to cylindrical section, L-shaped reinforcing rib to cylindrical section corner joint, and circumferential rib to cylindrical section corner joint, the overall continuity of the cylindrical body and L-shaped reinforcing rib 2 can be guaranteed, while effectively controlling welding deformation and achieving high assembly accuracy of the antenna main shaft.

[0046] The L-shaped reinforcing ribs 2 corresponding to S5 and 10# cylinder sections are welded to the upper flange 4 by plug welding, while the L-shaped reinforcing ribs 2 corresponding to 1# cylinder section are welded to the lower flange 5 by direct welding.

[0047] Since there is no space for direct welding between the L-shaped reinforcing rib 2 corresponding to section 10 and the upper flange 4, while there is sufficient space between the L-shaped reinforcing rib 2 corresponding to section 1 and the lower flange 5, the welding type is selected according to the structural characteristics, resulting in a high welding effect.

[0048] S6. Perform off-site assembly welding on the upper and lower sections. The specific welding methods are all existing technologies and will not be described in detail here. Example 2

[0049] A method for manufacturing a long-rod type ribbed thin-walled conical cylinder structure includes the following steps:

[0050] S1. Divide the antenna main shaft into upper and lower sections. The upper section includes sections 3-9, with the diameter of sections 3, 4, 5, 6, 7, 8, 9, and 10 gradually decreasing. Each section is 63cm long. The lower section includes sections 1 and 2, with the diameter of sections 1 and 2 gradually decreasing. Each section is 80cm long. Roll each section on a plate rolling machine.

[0051] S2. The L-shaped reinforcing ribs 2 corresponding to the No. 3 cylinder section are evenly assembled onto the inner wall of the No. 3 cylinder section along the center of the No. 3 cylinder section. The L-shaped reinforcing ribs 2 extend along the central axis of the No. 3 cylinder section. The length of the L-shaped reinforcing ribs 2 is equal to that of the No. 3 cylinder section and extends 50mm beyond the small end of the No. 3 cylinder section. The fillet weld between the L-shaped reinforcing ribs 2 and the No. 3 cylinder section is welded by manual tungsten inert gas welding.

[0052] Multiple arc-shaped ribs 31 are sequentially assembled on the inner wall of section 3. The multiple arc-shaped ribs 31 together form a ring rib 3, and single-sided welding and double-sided forming welding are performed by manual tungsten inert gas welding.

[0053] S3. Position weld the L-shaped reinforcing rib 2 corresponding to section 4 to the end of the L-shaped reinforcing rib 2 corresponding to section 3, ensuring that the straightness of the connected L-shaped reinforcing rib 2 meets the requirements.

[0054] The 4# cylinder section is placed on the outside of the L-shaped reinforcing rib 2 and moved towards the 3# cylinder section; when the distance between the 3# cylinder section and the 4# cylinder section is 90mm, the multi-segment arc-shaped ribs 31 are positioned and welded onto the 4# cylinder section to form the annular rib 3;

[0055] After moving section 4 to a distance of 4mm between the two sections, tack welding was performed on both sections, followed by butt joint 6 welding. Then, the fillet weld between L-shaped reinforcing rib 2 and section 3 was welded using manual tungsten inert gas welding, and the annular rib 3 was welded on one side and formed on both sides.

[0056] S4. Complete the welding and assembly of sections 5 to 9 and sections 1 and 2 of the lower section in the above order;

[0057] By following the assembly and welding sequence of L-shaped reinforcing rib 2 to L-shaped reinforcing rib 2, circumferential seam to cylindrical section, L-shaped reinforcing rib 2 to cylindrical section corner joint, and circumferential rib 3 to cylindrical section corner joint, the overall continuity of the cylindrical body and L-shaped reinforcing rib 2 can be guaranteed, while effectively controlling welding deformation and achieving high assembly accuracy of the antenna main shaft.

[0058] The L-shaped reinforcing ribs 2 corresponding to S5 and 9# cylinder sections are welded to the upper flange 4 by plug welding, while the L-shaped reinforcing ribs 2 corresponding to 1# cylinder section are welded to the lower flange 5 by direct welding.

[0059] S6. Perform off-site assembly and welding on the upper and lower sections.

[0060] The dimensions of the antenna spindle, after both welds, meet the requirements (see Table 1), and the weld quality is good. Radiographic testing was used to inspect the butt welds, and the results met the NB / T47013.2-2015 Class II standard. Penetrant testing was used to inspect all welds, and all results met the NB / T47013.5-2015 Class I standard. Dimensions were checked using a measuring tape and calipers, and all dimensions met the drawing requirements.

[0061]

[0062] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A method for manufacturing a long-rod type ribbed thin-walled conical cylinder, characterized in that, The inner wall of the cone is provided with a plurality of L-shaped reinforcing ribs (2) and annular ribs (3). The L-shaped reinforcing ribs (2) extend along the central axis of the cone, and the annular ribs (3) are arranged concentrically with the cone, including: S1. Divide the cone into N sections (1) of type 1#, 2#, 3#, ..., n#, including the first section (11) and the second section (12) set up adjacent to each other, and roll each section (1) on a plate rolling machine; S2. The L-shaped reinforcing ribs (2) corresponding to the first cylindrical section (11) are uniformly assembled onto the inner wall of the first cylindrical section (11). The L-shaped reinforcing ribs (2) extend along the central axis of the first cylindrical section (11). The length of the L-shaped reinforcing ribs (2) is equal to that of the first cylindrical section (11) and one end extends 40-60mm beyond the small end of the first cylindrical section (11). The fillet weld between the two is then welded. Multiple arc-shaped ribs (31) are assembled in sequence and welded onto the inner wall of the first cylindrical section (11). The multiple arc-shaped ribs (31) together form a ring rib (3). S3. Position weld the L-shaped reinforcing rib (2) corresponding to the second cylinder section (12) to the end of the L-shaped reinforcing rib (2) corresponding to the first cylinder section (11) to ensure that the straightness of the connected L-shaped reinforcing rib (2) meets the requirements. The second cylindrical section (12) is fitted on the outside of the L-shaped reinforcing rib (2) and moved toward the first cylindrical section (11); when the distance between the second cylindrical section (12) and the first cylindrical section (11) is 90-110mm, the multi-segment arc-shaped rib (31) is positioned on the second cylindrical section (12) to form a ring rib (3); After the second cylinder section (12) is moved to the side of the first cylinder section (11) and the distance between them is 3-4mm, the two are positioned and welded, and then the butt joint (6) is welded; then the L-shaped reinforcing rib (2) is welded to the second cylinder section (12) with a fillet weld, and the annular rib (3) is welded. S4. Following the above sequence, complete the welding and assembly of the other cylinder sections on the side of the second cylinder section (12) away from the first cylinder section (11); The cone is provided with an upper flange (4) and a lower flange (5) at both ends. The upper flange (4) is connected to the 1# cylinder section, and the lower flange (5) is connected to the n# cylinder section. The manufacturing method further includes: the L-shaped reinforcing rib (2) corresponding to the n# cylinder section is welded to the upper flange (4) by plug welding, and the L-shaped reinforcing rib (2) corresponding to the 1# cylinder section is directly welded to the lower flange (5).

2. The manufacturing method of the long rod-shaped ribbed thin-walled conical cylinder according to claim 1, characterized in that, The value of n is 6-12.

3. The manufacturing method of the long rod-shaped ribbed thin-walled conical cylinder according to claim 1, characterized in that... The cone is divided into an upper section and a lower section. The upper section is composed of sections 3, 4, ... n, and the lower section is composed of sections 1 and 2. The upper and lower sections are assembled and welded off-site.

4. The manufacturing method of the long rod-shaped ribbed thin-walled conical cylinder according to claim 1, characterized in that, The cylindrical section described in step S2 is welded to the arc-shaped rib (31) and / or the L-shaped reinforcing rib (2) by manual tungsten inert gas welding.

5. The manufacturing method of the long rod-shaped ribbed thin-walled conical cylinder according to claim 4, characterized in that, The cylindrical section (1) and the arc-shaped rib (31) are welded by single-sided welding with double-sided forming.

6. The manufacturing method of the long rod-shaped ribbed thin-walled conical cylinder according to claim 5, characterized in that, The distance of the L-shaped reinforcing rib (2) beyond the small end of the i# cylinder section is 50mm.

7. The manufacturing method of the long rod-shaped ribbed thin-walled conical cylinder according to claim 1, characterized in that, The cone is made of titanium alloy.

8. The method for manufacturing a long-rod type ribbed thin-walled conical cylinder according to claim 1, characterized in that, The long rod-shaped, ribbed, thin-walled conical tube is used as the main shaft for ship antennas.

Images