Process for manufacturing large stainless steel rocket segment

Abstract

The application discloses a large-scale stainless steel rocket short cylinder manufacturing process, which comprises the following steps: obtaining first sub-steel plates, placing stainless steel plates on a welding platform, and cutting the stainless steel plates into a plurality of first sub-steel plates with a rectangular shape; obtaining second sub-steel plates, sequentially abutting and tightly attaching long edges of the plurality of first sub-steel plates, and forming the second sub-steel plates with a plurality of first welds through laser welding at abutting positions of adjacent first sub-steel plates; obtaining third sub-steel plates, cutting the second sub-steel plates to form a third sub-steel plate with a rectangular shape; when the second sub-steel plates are cut, an included angle between one long edge of the third sub-steel plate and one long edge close to the second sub-steel plate is A, and an included angle between one short edge of the third sub-steel plate and one short edge close to the second sub-steel plate is B; obtaining short cylinder plane plates, sequentially abutting and tightly attaching short edges of the plurality of third sub-steel plates, forming second welds through laser welding at abutting positions of adjacent third sub-steel plates, and forming a rocket short cylinder. The process can reduce cost and improve work efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spacecraft, in particular to a large stainless steel rocket short cylinder manufacturing process. BACKGROUND

[0002] With the rapid development of the aerospace industry, various technologies involved in the field of rockets have also made great progress. The development trend of future launch vehicle technology will focus on improving performance, reducing cost, improving reliability, and reusability, which also brings new challenges to the manufacturing process of storage tanks.

[0003] On April 20, 2023, SpaceX launched the "Starship" rocket, marking the successful application of stainless steel in the storage tank of the SpaceX Starship rocket. In fact, before Starship, there were precedents for using stainless steel to manufacture storage tanks in the field of rocket manufacturing, such as the 301 stainless steel welded storage tank of the Ares D; the second stage storage tank of the Delta uses 410 stainless steel welded manufacturing; the booster of the Ariane 4 uses stainless steel for welded manufacturing. Among them, the largest amount and proportion of stainless steel is the Starship launch vehicle of SpaceX, most of the rocket body of Starship is made of 304L type stainless steel, which is a common commercially available cold-rolled stainless steel, and has obvious advantages in improving performance, reducing cost, improving reliability, and reusability.

[0004] Therefore, it is urgent to design a large stainless steel rocket short cylinder manufacturing process, which can use existing laser cutting equipment to process products when processing large-diameter rocket short cylinders, greatly reducing equipment costs, ensuring product cutting precision, reducing processing difficulty, and improving work efficiency. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a large stainless steel rocket short cylinder manufacturing process,

[0006] Obtain a first sub-steel plate, place the stainless steel plate on the welding platform and cut it into a plurality of first sub-steel plates with a rectangular shape;

[0007] Obtain a second sub-steel plate, abut and tightly fit the long edges of the plurality of first sub-steel plates in sequence, and the abutment parts of adjacent first sub-steel plates are formed into a second sub-steel plate containing a plurality of first welds by laser welding;

[0008] Obtaining a third sub-steel plate, cutting the second sub-steel plate to form a third sub-steel plate with a rectangular shape, wherein, when cutting, the included angle between one long side of the third sub-steel plate and one long side of the second sub-steel plate is A, and the included angle between one short side of the third sub-steel plate and one short side of the second sub-steel plate is B; wherein the included angles A and B are not zero;

[0009] Obtaining a short cylinder plane plate, abutting and closely adhering the short sides of a plurality of third sub-steel plates in sequence, and forming a second weld seam by laser welding at the abutting positions of adjacent third sub-steel plates, wherein the first weld seams on both sides of the second weld seam are parallel to each other;

[0010] Manufacturing a rocket short cylinder, bending the short cylinder plane plate into a cylinder, and abutting and laser welding the short sides to be welded on both sides of the short cylinder plane plate to form a rocket short cylinder.

[0011] Further, the included angle between one long side of the third sub-steel plate and one long side of the second sub-steel plate is a first included angle A, and the included angle between one short side of the third sub-steel plate and one short side of the second sub-steel plate is a second included angle B, wherein the first included angle A is equal to the second included angle B.

[0012] Further, the included angle between the long side of the third sub-steel plate and the long side of the second sub-steel plate satisfies 2°≤A≤8°.

[0013] Further, the included angle between the long side of the third sub-steel plate and the long side of the second sub-steel plate satisfies 3°≤A≤6°.

[0014] Further, the included angle between the short side of the third sub-steel plate and the short side of the second sub-steel plate satisfies 2°≤B≤8°.

[0015] Further, the included angle between the short side of the third sub-steel plate and the short side of the second sub-steel plate satisfies 4°≤B≤7°.

[0016] Further, the number of the first sub-steel plates is C, wherein 8≤C≤24.

[0017] Further, the number of the second sub-steel plates is D, wherein 2≤D≤6.

[0018] Further, the number of the third sub-steel plates is E, wherein 2≤E≤6.

[0019] Further, the length of the short side of the first sub-steel plate is F, and 1.2m≤F≤1.6m, and the thickness of the first sub-steel plate is H, and 0.8mm≤H≤4.2mm.

[0020] Compared with the prior art, the present application has at least one of the following beneficial effects:

[0021] A large stainless steel rocket short cylinder manufacturing process,

[0022] S1, acquire a first sub-steel plate, place the stainless steel plate on the welding platform and cut it into a plurality of first sub-steel plates with a rectangular shape;

[0023] S2, acquire a second sub-steel plate, abut and tightly connect the long edges of the plurality of first sub-steel plates in sequence, and form a second sub-steel plate containing a plurality of first welds by laser welding at the abutting parts of adjacent first sub-steel plates;

[0024] S3, acquire a third sub-steel plate, cut the second sub-steel plate to form a third sub-steel plate with a rectangular shape, and when cutting, the included angle between one long edge of the third sub-steel plate and the long edge close to the second sub-steel plate is A, and the included angle between one short edge of the third sub-steel plate and the short edge close to the second sub-steel plate is B; wherein the included angles A and B are not zero;

[0025] S4, acquire a short cylinder flat plate, abut and tightly connect the short edges of the plurality of third sub-steel plates in sequence, and form second welds by laser welding at the abutting parts of adjacent third sub-steel plates, wherein the first welds located on both sides of the second welds are parallel to each other;

[0026] S5, manufacture a rocket short cylinder, fold the short cylinder flat plate into a cylinder and abut and connect the short edges to be welded on both sides of the short cylinder flat plate by laser welding to form a rocket short cylinder.

[0027] When processing a large-diameter rocket short cylinder, the present application cuts a stainless steel plate into small-sized products, and then uses splicing welding method to obtain the required products, which not only can utilize the existing laser cutting equipment to process the products, but also greatly reduces the equipment cost, ensures the cutting precision of the products, reduces the processing difficulty, and improves the work efficiency.

[0028] In addition, the present application abuts and tightly connects the short edges of the plurality of third sub-steel plates in sequence, and forms a plurality of second welds by laser welding at the abutting parts of adjacent third sub-steel plates, wherein the first welds located on both sides of the second welds are parallel to each other. By using this non-parallel cutting and then welding method, the occurrence of cross welds at the positions of the first welds and the second welds can be effectively avoided, the pressure-bearing performance of the short cylinder is greatly improved, the weld cracking of the short cylinder due to high pressure is avoided, the stability and firmness of the short cylinder structure are ensured, and the safety of the rocket is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The flowchart of the large stainless steel rocket short cylinder manufacturing process of the present application;

[0030] Figure 2 The structure diagram of the first sub-steel plate of the present application;

[0031] Figure 3 A structure diagram of a second sub-steel plate of the present application;

[0032] Figure 4 A structure diagram of a third sub-steel plate of the present application;

[0033] Figure 5 A structure diagram of a short cylinder flat plate of the present application;

[0034] Figure 6 A structure diagram of a rocket short cylinder of the present application.

[0035] Explanation of reference numerals:

[0036] 1 first sub-steel plate 2 second sub-steel plate

[0037] 3 third sub-steel plate 4 short cylinder flat plate

[0038] 5 rocket short cylinder DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will clearly explain the spirit of the present application by means of the drawings and detailed description. Any person skilled in the art can make changes and modifications to the technology taught by the present application content after understanding the embodiments of the present application content, without departing from the spirit and scope of the present application content.

[0040] The illustrative embodiments of the present application and their description are used to explain the present application, but are not as a limitation of the present application. In addition, the same or similar elements / components in the drawings and embodiments are used to represent the same or similar parts.

[0041] As for the "first", "second", …, etc. used herein, it is not particularly intended to refer to the order or sequence, nor to limit the present application. It is only for distinguishing elements or operations described by the same technical terms.

[0042] As for the directional terms used herein, such as: up, down, left, right, front or back, etc., they are only the direction of the drawings. Therefore, the directional terms used are used to explain, not to limit the present creation.

[0043] As for the "include", "include", "have", "contain" and the like used herein, they are all open terms, that is, they mean to include but not limited to.

[0044] As for the "and / or" used herein, it includes any or all combinations of the described things.

[0045] As used herein, the terms "substantially," "approximately," and the like, are used to describe

[0046] Certain terminology of this application will be discussed below or elsewhere in this specification in order to provide a clear and consistent understanding of the application throughout the specification and claims.

[0047] In the existing manufacturing process of stainless steel rocket tanks, for a short cylinder with a diameter greater than or equal to 4500 mm, the short ring circumference expansion length reaches more than 14 meters. For a short cylinder with a height of 4 to 5 meters, the manufacturing of a super large diameter (6 to 10 meters and above) short cylinder is completed through a traditional process. The cutting accuracy requirement of the two-dimensional laser cutting platform is very high, which greatly increases the difficulty of product processing and seriously affects the work efficiency. Therefore, the existing process must be improved.

[0048] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , embodiments of the present application provide a large stainless steel rocket short cylinder manufacturing process of the present application, comprising:

[0049] S1, obtaining a first sub-steel plate 1, placing the stainless steel plate on a welding platform and cutting it into a plurality of first sub-steel plates 1 with a rectangular shape;

[0050] S2, obtaining a second sub-steel plate 2, abutting and tightly connecting the long edges of the plurality of first sub-steel plates 1 in sequence, and forming a second sub-steel plate 2 containing a plurality of first welds by laser welding at the abutting parts of adjacent first sub-steel plates 1;

[0051] S3, obtaining a third sub-steel plate 3, cutting the second sub-steel plate 2 to form a third sub-steel plate 3 with a rectangular shape; when cutting, the included angle between one long edge of the third sub-steel plate 3 and the long edge close to the second sub-steel plate 2 is A, and the included angle between one short edge of the third sub-steel plate 3 and the short edge close to the second sub-steel plate 2 is B; wherein the included angles A and B are not zero;

[0052] S4, obtaining a short cylinder flat plate 4, abutting and tightly connecting the short edges of the plurality of third sub-steel plates 3 in sequence, and forming a second weld by laser welding at the abutting parts of adjacent third sub-steel plates 3, wherein the first welds on both sides of the second weld are parallel to each other;

[0053] S5. Make rocket short tube 5 by bending the short tube flat plate 4 into a cylindrical shape, so that the short sides to be welded on both sides of the short tube flat plate 4 are joined together, and the rocket short tube 5 is formed by laser welding.

[0054] Specifically, the rocket short tube manufacturing process of this application involves cutting stainless steel plates into smaller sizes when processing large-diameter rocket short tubes, and then using a splicing and welding method to obtain the required products. This not only allows for the use of existing laser cutting equipment to process products, but also greatly reduces equipment costs, ensures product cutting accuracy, reduces processing difficulty, and improves work efficiency.

[0055] In addition, this application connects the short sides of multiple third sub-steel plates 3 one by one and then closes them tightly. The connecting parts of adjacent third sub-steel plates 3 are laser welded to form a second weld. This makes the first welds on both sides of the second weld parallel to each other. The setting of the positions of the first weld and the second weld also avoids the occurrence of cross welds. This greatly increases the pressure-bearing performance of the short cylinder and effectively prevents the short cylinder from cracking due to high pressure, thereby ensuring the stability of the rocket tank structure.

[0056] It should be noted that, in order to ensure the structural stability of the third sub-steel plate 3 and to make the rocket short tube have high compressive strength during manufacturing, so as to prevent the rocket short tube from cracking at the weld, for example, the angle between one long side of the third sub-steel plate 3 and one long side of the second sub-steel plate 2 is the first included angle A, and the angle between one short side of the third sub-steel plate 3 and one short side of the second sub-steel plate 2 is the second included angle B, wherein the first included angle A is equal to the second included angle B.

[0057] To facilitate the welding of the third sub-steel plate 3, avoid cross welds between the first and second welds, and ensure a strong weld between the third sub-steel plates 3, extensive experimental data showed that when the angle A between the long side of the third sub-steel plate 3 and the long side of the second sub-steel plate is 2°≤A≤8°, and the angle B between the short side of the third sub-steel plate 3 and the short side of the second sub-steel plate 2 is 2°≤B≤8°, the first and second welds are more robust, and the strength of the rocket short tube, especially the overall strength of the welded structure, is greater.

[0058] like Figure 3 and Figure 4 As shown, when the angle between the long side of the third sub-steel plate 3 and the long side of the second sub-steel plate 2 is A, which satisfies 3°≤A≤6°, and the angle between the short side of the third sub-steel plate 3 and the short side of the second sub-steel plate 2 is B, which satisfies 4°≤B≤7°, the pressure of the first and second welds on the inner wall of the rocket short tube can be better distributed, avoiding cracking of the short tube during rocket use and ensuring the structural stability of the rocket short tube.

[0059] In the same embodiment, in order to facilitate cutting, facilitate the rapid production of rocket short cylinders, for example, the number of first sub-steel plates 1 is 12. Through a large amount of data experimental analysis, when the number of first sub-steel plates 1 is C, and satisfies 8≤C≤24, not only facilitates the cutting and welding of the first sub-steel plate 1, but also facilitates the subsequent production of the rocket short cylinder, greatly improves the work efficiency.

[0060] Through a large amount of data experimental analysis, when the number of second sub-steel plates 2 is D, and satisfies 2≤D≤6, the second sub-steel plates 2 can be welded between them, and at the same time, the existing equipment can be better utilized to cut the second sub-steel plates 2 to produce the required third sub-steel plates, improving the production efficiency.

[0061] In actual application, when the number of third sub-steel plates 3 is E, and satisfies 2≤E≤6, the production efficiency, processing difficulty and performance requirements of the short cylinder can be better balanced. In addition, the number of third sub-steel plates 3 can also be adaptively adjusted according to the diameter size of the rocket short cylinder, further improving the adaptability of the method to different sizes of rocket short cylinders.

[0062] Further, in order to meet the strength of the first sub-steel plate 1 while facilitating rapid cutting and production, for example, when the first sub-steel plate short side length F satisfies 1.2m≤F≤1.6m, and the first sub-steel plate 1 thickness H satisfies 0.8mm≤H≤4.2mm, not only can the existing cutting platform be quickly cut, but also can be applied to the pressure design requirements of the rocket tank. In addition, since the size parameters of the first sub-steel plate directly affect the performance of the subsequent second sub-steel plate, third sub-steel plate and short cylinder, through experimental verification, by setting the first sub-steel plate to the above size, the subsequent product processing efficiency can be improved, the processing difficulty is reduced, and the mechanical properties of the sub-products and final products in the process are also better.

[0063] The above embodiments can be combined with each other, and have corresponding technical effects.

[0064] The above description is only a specific implementation of the present application, and any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present application shall fall within the scope of the present application.

Claims

1. A process for making large stainless steel rocket motor cases, characterized by, The application relates to a method for manufacturing a rocket short cylinder. The method comprises the following steps: obtaining a first sub-steel plate, placing a stainless steel plate on a welding platform and cutting the stainless steel plate into a plurality of first sub-steel plates with a rectangular shape; obtaining a second sub-steel plate, abutting and tightly connecting long edges of the plurality of first sub-steel plates in sequence, and forming a second sub-steel plate containing a plurality of first welds through laser welding at abutting positions of adjacent first sub-steel plates; obtaining a third sub-steel plate, cutting the second sub-steel plate to form a third sub-steel plate with a rectangular shape, wherein an angle between one long edge of the third sub-steel plate and one long edge close to the second sub-steel plate is A, and an angle between one short edge of the third sub-steel plate and one short edge close to the second sub-steel plate is B; wherein the angles A and B are not zero; obtaining a short cylinder plane plate, abutting and tightly connecting short edges of the plurality of third sub-steel plates in sequence, and forming second welds through laser welding at abutting positions of adjacent third sub-steel plates, wherein the first welds on both sides of the second welds are parallel to each other; 2. The process for making large stainless steel rocket motor cases as claimed in claim 1 wherein, manufacturing a rocket short cylinder, bending the short cylinder plane plate into a cylinder, abutting and connecting to be welded short edges on both sides of the short cylinder plane plate, and forming a rocket short cylinder through laser welding.

3. The process for making large stainless steel rocket motor cases as claimed in claim 1 wherein, The angle between one long edge of the third sub-steel plate and one long edge close to the second sub-steel plate is a first angle A, and the angle between one short edge of the third sub-steel plate and one short edge close to the second sub-steel plate is a second angle B, wherein the first angle A is equal to the second angle B.

4. The process for making large stainless steel rocket motor cases as claimed in claim 3 wherein, The angle A between the long edge of the third sub-steel plate and the long edge of the second sub-steel plate satisfies 2°<=A<=8°.

5. The process for making large stainless steel rocket motor cases as claimed in claim 1 wherein, The angle A between the long edge of the third sub-steel plate and the long edge of the second sub-steel plate satisfies 3°<=A<=6°.

6. The process for making large stainless steel rocket motor cases as claimed in claim 5 wherein, The angle B between the short edge of the third sub-steel plate and the short edge of the second sub-steel plate satisfies 2°<=B<=8°.

7. The process for making large stainless steel rocket motor cases as claimed in claim 1 wherein, The angle B between the short edge of the third sub-steel plate and the short edge of the second sub-steel plate satisfies 4°<=B<=7°.

8. The process for making large stainless steel rocket motor cases as claimed in claim 1 wherein, The number of the first sub-steel plates is C, wherein 8<=C<=24.

9. The process for making large stainless steel rocket motor cases as claimed in claim 1 wherein, The number of the second sub-steel plates is D, wherein 2<=D<=6.

10. The process for making large stainless steel rocket motor cases as claimed in claim 1 wherein, The number of the third sub-steel plates is E, wherein 2<=E<=3. The length of the short edge of the first sub-steel plate is F, and 1.2m<=F<=1.6m; the thickness of the first sub-steel plate is H, and 0.8mm<=H<=4.2mm.

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