Carrier rocket bulging storage tank and manufacturing method

Abstract

The invention provides a carrier rocket bulging storage tank and a manufacturing method thereof.The manufacturing method comprises the steps that firstly, the two ends of a bulging cylinder are plugged, then the bulging cylinder is filled with pressure, and the bulging cylinder is bulged in the radial direction of the bulging cylinder; after the bulging of the bulging cylinder is completed, the turning frame and the ring rib are arranged on the bulging cylinder to form a cylinder section assembly, meanwhile, pressurization is injected to the bulging box bottom, so that the bulging box bottom is subjected to bulging in the axial direction and the radial direction, and after bulging is completed, the bulging box bottom is divided into a first box bottom and a second box bottom; and then the first box bottom and the second box bottom are arranged at the two ends of the barrel section assembly, finally, the short shell assemblies are arranged at the two ends of the barrel section assembly, and manufacturing of the storage box is completed. According to the manufacturing method, the manufacturing period of the storage box can be shortened, the manufacturing cost can be reduced, and then the manufacturing success rate and the manufacturing efficiency of the storage box are improved.

Description

Technical Field

[0001] The invention relates to the technical field of tank structure and manufacturing, and in particular to a launch vehicle bulging tank and a manufacturing method thereof. Background Art

[0002] With the advancement of science and technology, rocket launches are becoming more and more frequent. Rocket launches require the use of liquid fuel, which is stored in liquid fuel tanks. Therefore, liquid fuel tanks are important components of launch vehicles. The current tank manufacturing processes mainly include machine milling + welding, chemical milling + welding and bulging processes. Machine milling + welding and chemical milling + welding processes have relatively mature manufacturing processes, but their manufacturing processes are relatively complex, material utilization rates are low, and manufacturing cycles are long, which leads to higher costs and the inability to manufacture thin-walled tanks.

[0003] The existing bulging manufacturing process mainly adopts the axial bulging method, that is, bulging is performed in the axial direction, which can realize the manufacture of thin-walled and ultra-thin-walled tanks. However, the axial bulging process requires a tooling with a higher pressure and adaptable to the change in the axial length of the barrel section, so as to ensure that the barrel section skin, longitudinal reinforcement and weld are axially stretched and hardened, thereby putting forward higher requirements on the welding quality and tooling strength. At the same time, the axial bulging process also has the problem that its finished tank has marks at the tooling wrapping and obvious depressions at the joint position, and the manufacturing accuracy is difficult to accurately control. In addition, the axial bulging process adopts the method of bulging the entire tank as a whole, which leads to the risk of the entire tank being scrapped due to local defects during the manufacturing process, thereby increasing the manufacturing cost and time cycle, and reducing the manufacturing quality and efficiency of the tank. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is that the existing axial bulging tank process has the problem that the finished tank has marks at the tooling tape and obvious depressions at the joints, and its manufacturing accuracy is difficult to accurately control. At the same time, during the bulging process, since the axial bulging process adopts the overall bulging of the tank, the entire tank is easily scrapped due to local defects, which increases the manufacturing cost and time cycle, and reduces the manufacturing quality and manufacturing efficiency of the tank.

[0005] To this end, the present invention provides a method for manufacturing a launch vehicle bulging tank, comprising:

[0006] The two ends of the expansion cylinder are sealed, and then the expansion cylinder is filled with fluid and pressurized to expand the expansion cylinder in a radial direction;

[0007] Filling and pressurizing the bulging box bottom to bulge the bulging box bottom in the axial direction and radial direction, and after the bulging is completed, dividing the bulging box bottom into a first box bottom and a second box bottom;

[0008] Install the first bottom of the box and the second bottom of the box at both ends of the cylinder section assembly respectively.

[0009] Optionally, the step of plugging both ends of the bulging cylinder, then injecting pressure into the bulging cylinder to cause the bulging cylinder to bulge radially includes:

[0010] Set a limiting cylinder outside the bulging cylinder;

[0011] Connect two auxiliary end caps to both ends of the bulging cylinder;

[0012] Inject pressure into the bulging cylinder through the pressure injection port on the auxiliary end cap, and stop injecting pressure after the outer wall of the bulging cylinder bulges radially until it abuts against the inner wall of the limiting cylinder.

[0013] Optionally, after the step of injecting pressure into the bulging cylinder through the pressure injection port on the auxiliary end cap and stopping injecting pressure after the outer wall of the bulging cylinder bulges radially until it abuts against the inner wall of the limiting cylinder, the following steps are further included:

[0014] Remove the limiting cylinder and the auxiliary end caps.

[0015] Optionally, after the step of removing the limiting cylinder and the auxiliary end caps, the following steps are further included:

[0016] Arrange a plurality of ring ribs on the inner wall of the bulging cylinder at intervals along the axial direction of the bulging cylinder through a support member.

[0017] Optionally, after the step of arranging a plurality of ring ribs on the inner wall of the bulging cylinder at intervals along the axial direction of the bulging cylinder through a support member, the following steps are further included:

[0018] Set turning frames at both ends of the bulging cylinder respectively to form a cylinder section assembly.

[0019] Optionally, after the step of installing the first bottom of the box and the second bottom of the box at both ends of the cylinder section assembly respectively, the following steps are further included:

[0020] Set guard plates on both sides of both ends of the corrugated plate, and set an end frame on one end face of the corrugated plate to form a connecting short shell;

[0021] Connect the two connecting short shells to the two turning frames at both ends of the cylinder section assembly respectively.

[0022] Optionally, before the step of plugging both ends of the bulging cylinder, then injecting pressure into the bulging cylinder to cause the bulging cylinder to bulge radially, the following steps are further included:

[0023] Arrange a plurality of longitudinal ribs on the inner wall of the cylindrical skin at intervals along the circumferential direction of the skin, and set thickening areas at both ends of the skin to form a bulging cylinder.

[0024] Optionally, the step of filling and pressurizing the bottom of the bulging tank to cause the bottom of the bulging tank to bulge axially and radially, and after the bulging is completed, dividing the bottom of the bulging tank into a first bottom and a second bottom includes:

[0025] Connecting the first bottom and the second bottom to form the bottom of the bulging tank;

[0026] Filling and pressurizing the bottom of the bulging tank to cause the bottom of the bulging tank to bulge;

[0027] After the bulging is completed, dividing the bottom of the bulging tank into the first bottom and the second bottom.

[0028] Optionally, after the step of dividing the bottom of the bulging tank into the first bottom and the second bottom after the bulging is completed, further includes:

[0029] Providing a manhole on one of the first bottom and the second bottom, and providing a liquid injection port and a liquid outlet on the other bottom.

[0030] The present invention also provides a bulging storage tank for a launch vehicle, manufactured by using the manufacturing method of the bulging storage tank for a launch vehicle as described above, including:

[0031] A cylinder section assembly, the cylinder section assembly includes a bulging cylinder and two turning frames, the two turning frames are arranged at both ends of the bulging cylinder, the cylinder section assembly further includes a ring rib, and the ring rib is arranged on the bulging cylinder at intervals along the axial direction of the bulging cylinder;

[0032] A bottom assembly of the tank, the bottom assembly of the tank includes a first bottom and a second bottom, the first bottom and the second bottom are respectively arranged at both ends of the cylinder section assembly, and the cylinder section assembly, the first bottom and the second bottom enclose a storage cavity, and the storage cavity is suitable for storing liquid fuel;

[0033] A short shell assembly, the two groups of short shell assemblies include two connecting short shells, and the two connecting short shells are respectively connected to the two turning frames.

[0034] The technical solution of the present invention has the following advantages:

[0035] 1. The present invention provides a manufacturing method for a bulging storage tank of a launch vehicle. First, seal both ends of the bulging cylinder, then fill and pressurize the inside of the bulging cylinder to cause the bulging cylinder to bulge radially; then cause the bottom of the bulging tank to bulge axially and radially. After the bulging is completed, divide the bottom of the bulging tank into a first bottom and a second bottom, and then arrange the first bottom and the second bottom at both ends of the cylinder section assembly.

[0036] The existing axial bulging process requires a relatively high pressure and a tooling that can adapt to the change in the axial length of the barrel section, which is convenient for ensuring that the barrel section skin, longitudinal ribs, and welds are axially stretched and hardened, and thus puts forward higher requirements for welding quality and tooling strength. At the same time, the axial bulging process also has problems such as marks on the tooling band of the finished storage tank and obvious depressions at the joint position, and its manufacturing accuracy is difficult to accurately control. In addition, the axial bulging process uses the method of overall bulging of the storage tank, resulting in the risk of the entire storage tank being scrapped due to local defects during the manufacturing process, which increases the manufacturing cost and time cycle, and reduces the manufacturing quality and efficiency of the storage tank. Through the above manufacturing method, on the one hand, it can make the surface of the storage tank smoother and defect-free while realizing the manufacturing of an ultra-thin skin storage tank. On the other hand, it can make the bulging manufacturing accuracy higher while realizing a smaller filling pressure, and can also reduce the requirements for weld quality and tooling strength, thereby achieving a higher material hardening rate and achieving the purpose of weight reduction. In addition, the bulging cylinder and the bulging tank bottom are respectively manufactured by independent bulging, which can shorten the manufacturing cycle of the storage tank, greatly reduce the manufacturing cost, and thus improve the manufacturing success rate and manufacturing efficiency of the storage tank.

[0037] 2. The present invention provides a method for manufacturing a bulged storage tank of a launch vehicle. By arranging a limiting cylinder outside the bulging cylinder, the bulging of the bulging cylinder is completed when it bulges to abut against the inner wall of the limiting cylinder, and the limiting cylinder is detachably connected to the bulging cylinder, which can make the disassembly and assembly of the bulging tooling of the storage tank more convenient, thereby saving the manufacturing cost and improving the manufacturing efficiency of the bulged storage tank.

[0038] 3. The present invention provides a bulged storage tank of a launch vehicle, including a barrel section assembly, a tank bottom assembly, and a short shell assembly. The tank bottom assembly is arranged at both ends of the barrel section assembly, and the short shell assembly is respectively connected to both ends of the barrel section assembly. By bulging the barrel section assembly and the tank bottom assembly, the structural strength of the storage tank can be improved, thereby reducing the weight of the storage tank and making the storage tank more lightweight.

[0039] 4. The present invention provides a bulged storage tank of a launch vehicle. By manufacturing the longitudinal ribs and the circumferential ribs with higher-strength and thinner materials, higher material utilization rate can be achieved, thereby achieving the purpose of weight reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1Schematic diagram of the overall three-dimensional structure of the present invention;

[0042] Figure 2 Schematic diagram of the bulging structure of the present invention;

[0043] Figure 3 Schematic diagram of the structure of the barrel section assembly after bulging of the present invention;

[0044] Figure 4 Schematic diagram of the structure of the first bottom of the box before bulging of the present invention;

[0045] Figure 5 Schematic diagram of the structure of the second bottom of the box before bulging of the present invention;

[0046] Figure 6 Schematic diagram of the structure of the first bottom of the box after bulging of the present invention;

[0047] Figure 7 Schematic diagram of the structure of the second bottom of the box after bulging of the present invention;

[0048] Figure 8 Schematic diagram of the structure of the short shell assembly of the present invention;

[0049] Figure 9 Schematic diagram of the partial enlarged structure at position A of the short shell assembly of the present invention;

[0050] Figure 10 Schematic diagram of the partial enlarged structure at position B of the short shell assembly of the present invention;

[0051] Figure 11 Schematic diagram of the connection structure between the skin and the longitudinal bars of the present invention.

[0052] Explanation of the reference numerals in the embodiments:

[0053] 1. Barrel section assembly; 2. Bottom of the box assembly; 3. Short shell assembly; 4. Limiting cylinder; 5. Auxiliary head;

[0054] 11. Bulging cylinder; 12. Turning frame; 13. Ring rib;

[0055] 111. Skin; 112. Thickened area; 113. Longitudinal bar; 114. Support member;

[0056] 21. First bottom of the box; 22. Second bottom of the box; 23. Manhole; 24. Liquid injection port; 25. Liquid outlet;

[0057] 211. First straight cylinder; 212. First conical part; 213. First circular plate;

[0058] 221. Second straight cylinder; 222. Second conical part; 223. Second circular plate;

[0059] 31. Corrugated plate; 32. End frame; 33. Guard plate;

[0060] 41. Limit plate

[0061] 51. Ellipsoidal head; 52. Conical section Detailed implementation manners

[0062] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0063] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0064] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0065] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0066] As Figures 1 to 11 shown, this embodiment provides a manufacturing method for a bulging storage tank of a launch vehicle, including:

[0067] Seal both ends of the bulging cylinder 11, and then inject and pressurize into the bulging cylinder 11 to make the bulging cylinder 11 bulge radially.

[0068] Inject and pressurize into the bottom of the bulging tank to make the bottom of the bulging tank bulge axially and radially. After the bulging is completed, divide the bottom of the bulging tank into a first bottom 21 and a second bottom 22.

[0069] Install the first bottom 21 and the second bottom 22 at both ends of the cylinder section assembly 1 respectively.

[0070] The bulging cylinder 11 and the bulging box bottom are both welded from metals with good plasticity before bulging. It is particularly noted that the structures of the bulging cylinder 11 and the bulging box bottom are welded and manufactured using annealed materials, and then subjected to bulging cold working hardening treatment.

[0071] It is particularly noted that in this embodiment, the expansion cylinder 11 is first expanded and then the expansion box bottom is expanded. Of course, in this embodiment, the expansion box bottom can also be expanded first and then the expansion cylinder 11 is expanded. This embodiment does not limit the expansion sequence of the expansion cylinder 11 and the expansion box bottom. Technical personnel in this field can change the expansion sequence of the expansion cylinder 11 and the expansion box bottom according to actual conditions, as long as the same technical effect can be achieved.

[0072] In the embodiment of the present invention, compared with the existing axial bulging method, the present tank manufacturing method can, on the one hand, make the tank surface smoother and defect-free while realizing the manufacture of ultra-thin skin tanks, and on the other hand, can make the tank bulging manufacturing accuracy higher while achieving a smaller filling pressure, and can also reduce the requirements for weld quality and tooling strength, thereby achieving a higher material hardening rate, thereby achieving the purpose of weight reduction. In addition, the bulging cylinder and the bulging tank bottom are independently bulged and manufactured, which can shorten the tank manufacturing cycle, greatly reduce the manufacturing cost, and thus improve the tank manufacturing success rate and manufacturing efficiency.

[0073] Specifically, before the step of sealing both ends of the bulging cylinder 11 and then injecting and pressurizing the bulging cylinder 11 to bulge the bulging cylinder 11 in the radial direction, the step further includes:

[0074] A plurality of longitudinal ribs 113 are arranged at intervals along the circumferential direction of the cylindrical skin 111 on the inner wall of the skin 111 , and thickened areas 112 are provided at both ends of the skin 111 to form an expanded cylinder 11 .

[0075] Among them, the longitudinal ribs 113 are made of reinforced metal sheets, and the reinforced state includes a cold-work hardening state and a heat-treated reinforced state. The material used for the longitudinal ribs 113 is consistent with the material of the skin 111, which is convenient for welding. The cross-section of the longitudinal ribs 113 is a thin-walled semicircular shape, which is suitable for bulging the longitudinal ribs 113. A thickened area 112 is provided at the edge connection between the longitudinal ribs 113 and the skin 111, and the thickened area 112 is suitable for strengthening the connection strength of the longitudinal ribs 113.

[0076] The skin 111 is made of metal thin plates with equal thickness and is in the shape of a hollow cylinder. The longitudinal bars 113 are welded to the skin 111 for bulging. The percentage increase in the diameter of the bulged cylinder 11 after bulging is the bulging rate. When the length of the storage tank is relatively large, multiple bulged cylinders 11 can be bulged separately and then welded into a whole, and then the turning frame 12 and the ring bars 13 are welded to the bulged cylinder 11 to form a cylinder section assembly 1. Then, the first bottom 21, the second bottom 22, and the short shell assembly 3 are welded to the cylinder section assembly 1 to complete the installation of the storage tank.

[0077] In addition, the distance between the welds on both sides of the longitudinal bar 113 is less than the diameter of the longitudinal bar 113. Taking the longitudinal bar 113 with a semi-circular cross-section and a designed diameter of 50 mm after bulging as an example, if the bulging rate of the cylinder section assembly is 25%, the distance between the welds on both sides of the longitudinal bar 113 before bulging is 40 mm, and it increases to the designed value of 50 mm after bulging. In the embodiment of the present invention, there are several longitudinal bars 113. The number, cross-sectional size, and thickness of the longitudinal bars 113 are not limited in this embodiment, and those skilled in the art can change the number, cross-sectional size, and thickness of the longitudinal bars 113 according to the actual situation.

[0078] Specifically, the steps of blocking both ends of the bulged cylinder 11 and then injecting pressure into the bulged cylinder 11 to make the bulged cylinder 11 bulge radially include:

[0079] Placing the limiting cylinder 4 outside the bulged cylinder 11;

[0080] Among them, the limiting cylinder 4 is composed of several standard limiting plates 41 spliced together and is divided into three parts, which are connected by bolts for easy disassembly and assembly. In addition, the length of the limiting cylinder 4 can be determined according to the actual length of the bulged cylinder 11. Due to the springback phenomenon of the bulged cylinder 11 after bulging, the inner diameter of the limiting cylinder 4 is larger than the outer diameter of the bulged cylinder 11, and the bulging pressure of the bulged cylinder 11 is based on the fact that the bulged cylinder 11 completely fits the inner wall of the limiting cylinder 4.

[0081] Connecting two auxiliary end caps 5 to both ends of the bulged cylinder 11;

[0082] Among them, the auxiliary end cap 5 is composed of an ellipsoidal end cap 51 and a conical section 52. The conical section 52 is welded to both ends of the bulged cylinder 11, and the ellipsoidal end cap 51 is arranged on the conical section 52 to bulge the bulged cylinder 11. During the bulging process of the bulged cylinder 11, the ellipsoidal end cap 51 does not have permanent deformation and can be reused, while the conical section 52 will have permanent deformation and cannot be reused.

[0083] Pressurize the inside of the bulging cylinder 11 through the pressurizing port on the auxiliary head 5, and stop pressurizing when the outer wall of the bulging cylinder 11 bulges radially until it abuts against the inner wall of the limiting cylinder 4.

[0084] Among them, as Figure 2 shown, the ellipsoidal head 51 is concave, the ellipsoidal head 51 is reversely installed on the conical section 52. In addition, after the auxiliary head 5 is welded to the bulging cylinder 11, upright-state bulging is carried out. Through the upright-state bulging and the reverse installation of the ellipsoidal head 51, the requirement for the height of the workshop can be reduced.

[0085] When the bulging cylinder 11 bulges, the diameter of the bulging cylinder 11 increases but the length remains unchanged. Before bulging, the auxiliary head 5 is welded to the bulging cylinder 11. At this time, the structure is thick at both ends and thin in the middle. After bulging, the diameter of the bulging cylinder 11 increases, and the structure is thick in the middle and thin at both ends.

[0086] Specifically, after the step of pressurizing the inside of the bulging cylinder 11 through the pressurizing port on the auxiliary head 5 and stopping pressurizing when the outer wall of the bulging cylinder 11 bulges radially until it abuts against the inner wall of the limiting cylinder 4, the following steps are further included:

[0087] Remove the limiting cylinder 4 and the auxiliary head 5.

[0088] Furthermore, since the setting of the limiting cylinder and the auxiliary head is only for facilitating the bulging of the bulging cylinder, the final formed storage tank does not require the limiting cylinder and the auxiliary head. Therefore, after the bulging of the bulging cylinder is completed, it is necessary to remove the limiting cylinder 4 and the auxiliary head 5 to facilitate the subsequent connection of the bulging cylinder with other components.

[0089] In the embodiment of the present invention, by arranging the limiting cylinder 4 outside the bulging cylinder 11 and the limiting cylinder 4 is detachably connected to the bulging cylinder 11, the disassembly and assembly of the bulging tooling of the storage tank can be made more convenient, thereby saving the manufacturing cost and improving the manufacturing efficiency of the bulging storage tank.

[0090] Specifically, after the step of removing the limiting cylinder 4 and the auxiliary head 5, the following steps are further included:

[0091] Arrange a plurality of ring ribs 13 on the inner wall of the bulging cylinder 11 along the axial direction of the bulging cylinder 11 at intervals through the support member 114.

[0092] Among them, as Figure 3As shown, the ring rib 13 is in the shape of a thin-walled annular circular tube. The ring rib 13 is made of cold-work hardened or heat-treated strengthened material. Of course, on the premise of meeting the strength requirements, the ring rib 13 can also be made of solution-treated material. After the bulging cylinder 11 is bulged, the ring rib 13 is welded to the support member 114, which is suitable for fixing the bulged bulging cylinder 11.

[0093] In the embodiment of the present invention, by using higher-strength and thinner materials to manufacture the longitudinal ribs and the ring ribs, higher material utilization rate can be achieved, and thus the purpose of weight reduction is achieved.

[0094] Specifically, after the step of arranging a plurality of ring ribs 13 along the axial direction of the bulging cylinder 11 at intervals on the inner wall of the bulging cylinder 11 through the support member 114, the following steps are further included:

[0095] Turning frames 12 are respectively arranged at both ends of the bulging cylinder 11 to form a cylinder section assembly 1.

[0096] Among them, the turning frame 12 is made of a relatively thick steel plate. After the bulging cylinder 11 is bulged, the turning frame 12 is welded to the edges at both ends of the bulging cylinder 11, which is suitable for connecting with the short shell assembly 3.

[0097] Specifically, the steps of injecting pressure into the bulging box bottom to cause the bulging box bottom to bulge axially and radially, and after the bulging is completed, dividing the bulging box bottom into a first box bottom 21 and a second box bottom 22 include:

[0098] Connecting the first box bottom 21 and the second box bottom 22 to form the bulging box bottom;

[0099] Injecting pressure into the bulging box bottom to cause the bulging box bottom to bulge;

[0100] After the bulging is completed, dividing the bulging box bottom into the first box bottom 21 and the second box bottom 22.

[0101] Among them, as Figure 4 and Figure 5As shown, the first bottom 21 of the box includes a first straight cylinder 211, a first conical part 212, and a first circular plate 213. The first straight cylinder 211 is arranged at one end of the skin 111 and is connected to the thickened area 112. The first conical part 212 is connected to the first straight cylinder 211, and the first circular plate 213 is connected to the first conical part 212. Similarly, the second bottom 22 of the box includes a second straight cylinder 221, a second conical part 222, and a second circular plate 223. The second straight cylinder 221 is arranged at one end of the skin 111 and is connected to the thickened area 112. The second conical part 222 is connected to the second straight cylinder 221, and the second circular plate 223 is connected to the second conical part 222. By sequentially forming the first bottom 21 with the first straight cylinder 211, the first conical part 212, and the first circular plate 213, and then sequentially welding the second straight cylinder 221, the second conical part 222, and the second circular plate 223 to form the second bottom 22, and then welding the first bottom 21 and the second bottom 22 to form the bulged bottom of the box, subjecting it to pressure bulging. After the bulging is completed, cutting the bulged bottom of the box to obtain the first bottom 21 and the second bottom 22, and then welding the first bottom 21 and the second bottom 22 to the thickened area 112 to complete the installation of the first bottom 21 and the second bottom 22. In addition, both the first bottom 21 and the second bottom 22 are welded and manufactured using annealed state materials and are subjected to cold work hardening treatment by bulging.

[0102] Specifically, after the step of dividing the bulged bottom of the box into the first bottom 21 and the second bottom 22 after the bulging is completed, it further includes:

[0103] Providing a manhole 23 on one of the first bottom 21 and the second bottom 22, and providing a liquid injection port 24 and a liquid discharge port 25 on the other bottom of the box.

[0104] In the embodiment of the present invention, as Figures 4 to 7 shown, the manhole 23 is provided on the first bottom 21 and is located in the middle of the first circular plate 213. The second bottom 22 is provided with the liquid injection port 24 and the liquid discharge port 25. The manhole 23 is suitable for staff to enter for maintenance and cleaning, and the liquid injection port 24 and the liquid discharge port 25 are suitable for liquid fuel to be filled and discharged. Of course, the liquid injection port 24 and the liquid discharge port 25 are provided on the first bottom 21, and the manhole 23 is provided on the second bottom 22. In this embodiment, the installation positions of the manhole 23, the liquid injection port 24, and the liquid discharge port 25 are not limited, and those skilled in the art can change the installation positions of the manhole 23, the liquid injection port 24, and the liquid discharge port 25 according to the actual situation.

[0105] Specifically, after the steps of respectively installing the first bottom 21 and the second bottom 22 at both ends of the cylinder section assembly 1, the following steps are further included:

[0106] On both sides of the two ends of the corrugated plate 31, guard plates 33 are provided, and on one end face of the corrugated plate 31, an end frame 32 is provided to form a connecting short shell;

[0107] Connect the two connecting short shells to the two turning frames 12 at both ends of the cylinder section assembly 1 respectively.

[0108] Among them, as Figures 8 to 10 shown, weld the corrugated plate 31 to the turning frame 12, then weld the guard plates 33 to both ends of the corrugated plate 31, and then weld the end frame 32 to the end of the corrugated plate 31 away from the turning frame 12 to complete the installation of the connecting short shell. In addition, the corrugated plate 31 is made of a high-strength material in a cold-work hardened state or a strengthened state after heat treatment, and the guard plate 33 is made of a solution-treated material and is corrugated, matching the shape of the corrugated plate 31, and is connected to the corrugated plate 31 by spot welding or riveting.

[0109] The present invention also provides a bulging storage tank for a launch vehicle, which is made by using the manufacturing method of the bulging storage tank for a launch vehicle as described above, and includes:

[0110] A cylinder section assembly 1, the cylinder section assembly 1 includes a bulging cylinder 11 and two turning frames 12, the two turning frames 12 are arranged at both ends of the bulging cylinder 11, the bulging cylinder 11 includes a skin 111, longitudinal ribs 113, and support members 114. At both ends of the skin 111, there are thickened areas 112, and the turning frames 12 are arranged on the thickened areas 112. The longitudinal ribs 113 are evenly arranged on the skin 111 and are connected to the thickened areas 112 at both ends. The support members 114 are distributed on the skin 111 and are arranged at intervals with the longitudinal ribs 113; the cylinder section assembly 1 further includes a ring rib 13, and the ring rib 13 is arranged on the bulging cylinder 11 at intervals along the axial direction of the bulging cylinder 11;

[0111] A bottom assembly 2, the bottom assembly includes a first bottom 21 and a second bottom 22, the first bottom 21 and the second bottom 22 are respectively arranged at both ends of the cylinder section assembly 1, and the cylinder section assembly 1, the first bottom 21 and the second bottom 22 enclose a storage cavity, and the storage cavity is suitable for storing liquid fuel;

[0112] The short shell assembly 3, the two groups of short shell assemblies 3 include two connecting short shells, and the two connecting short shells are respectively connected to the two turning frames 12. The connecting short shell includes a corrugated plate 31, an end frame 32, and a guard plate 33. The corrugated plate 31 is respectively arranged on the turning frame 12. The end frame 32 is arranged at one end of the corrugated plate 31 away from the skin 111. The guard plate 33 is arranged on the two end edges of the corrugated plate 31 and is respectively connected to the end frame 32 and the turning frame 12.

[0113] In the embodiment of the present invention, the bottom assembly 2 of the tank is arranged at both ends of the cylinder section assembly 1, and the short shell assemblies 3 are respectively connected to both ends of the cylinder section assembly 1. By bulging the cylinder section assembly 1 and the bottom assembly 2 of the tank, the structural strength of the storage tank can be improved, and further the weight of the storage tank is reduced, making the storage tank more lightweight.

[0114] Embodiment 1

[0115] A stainless steel bulged storage tank with a diameter of 3.35m includes

[0116] The outer diameter of the storage tank is set to 3.35m, and the length of the cylinder section assembly 1 is set to 3.5m. Before bulging, the outer diameter of the cylinder section assembly 1 is set to 2.68m. In addition, the corrugated plate 31, the longitudinal ribs 113, and the circumferential ribs 13 are made of 301 stainless steel plates, and other components are welded and manufactured with solution-treated 304 stainless steel plates.

[0117] Before bulging, the thickness of the skin 111 is 1.5mm, the height of the thickened area 112 is 60mm, and it is made of a steel plate with a thickness of 3mm; the width of the turning frame 12 is 30mm, the thickness is 4mm, there are 60 longitudinal ribs 113, the diameter is 50mm, the wall thickness is 0.5mm, and the weld spacing is 40mm when welded to the skin 111, and the cross-section is semi-elliptical. The outer diameter of the circumferential rib 13 is 20mm, and the wall thickness is 1.0mm.

[0118] Before bulging, the wall thicknesses of the first bottom 21 and the second bottom 22 are both set to 1.5mm, and they are welded by a straight cylinder, three conical parts, and a circular plate; the first bottom 21 is provided with an access door 23 with a diameter of 500mm.

[0119] The height of the short shell assembly 3 is 400mm, where the thickness of the corrugated plate 31 is 1.0mm, the thickness of the guard plate 33 is 1.5mm, the height is 35mm, the width of the end frame 32 is 40mm, and the thickness is 4mm.

[0120] During the bulging process of the bulging cylinder body 11, the bulging cylinder body 11 bulges from 2.68 m to 3.35 m, that is, the bulging rate is 25%. The diameter of the longitudinal ribs 113 bulges into a semicircle with a diameter of 50 mm, and the maximum bulging pressure is about 1.0 Mpa. The bulging cylinder body 11 is restricted by the limiting cylinder 4 with an inner diameter of 3.36 m. After bulging and pressure relief, the outer diameter of the bulging cylinder body 11 is 3.35 m.

[0121] Embodiment 2

[0122] An aluminum alloy bulging storage tank with a diameter of 3.35 m, comprising

[0123] On the basis of Embodiment 1, the corrugated plate 31, longitudinal ribs 113, and circumferential ribs 13 are made of T6 - state aluminum alloy 2A12, and other components are welded and manufactured with annealed aluminum alloy 5A06. Among them, the thickness of the skin 111 before bulging is set to 3.0 mm, the thickness of the thickened area 112 is set to 5.0 mm, and the thicknesses of other components are all set to twice that of Embodiment 1, including the thickness of the auxiliary head 5. The number of the longitudinal ribs 113 is set to 50. In addition, since the plastic elongation rate of the aluminum alloy is less than that of 304 stainless steel, the bulging rate is reduced to 10%, and other dimensions are the same as those in Embodiment 1.

[0124] The specific manufacturing process of the bulging storage tank of the carrier rocket of the present invention is as follows:

[0125] First, the thickened area 112 is welded to the two - end edges of the skin 111, then the longitudinal ribs 113 and the support members 114 are welded to the skin 111 at uniform intervals to form the bulging cylinder body 11. Then, the limiting cylinder 4 is arranged on the bulging cylinder body 11, and the auxiliary heads 5 are welded to the two ends of the bulging cylinder body 11, and it is pressurized for bulging. After bulging is completed, the limiting cylinder 4 is removed, and then the two - end auxiliary heads 5 are cut to form the bulging cylinder body 11 after bulging. Then, the circumferential ribs 13 are welded to the support members 114, and the turning frames 12 are welded to the thickened areas 112 at the two ends of the skin 111 to form the cylinder section assembly 1; the first bottom 21 and the second bottom 22 are welded to form the bulging bottom of the tank, and the bulging bottom of the tank is pressurized for bulging. After the bulging of the bulging bottom of the tank is completed, the bulging bottom of the tank is divided into the first bottom 21 and the second bottom 22, and then the first bottom 21 and the second bottom 22 are respectively welded to the thickened area 112. Finally, the short shell assembly 3 is welded to the turning frame 12 to complete the bulging and installation process of the storage tank.

[0126] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A method for manufacturing a bulging tank of a launch vehicle, characterized in that: The steps include: The two ends of the expansion cylinder (11) are sealed, and then the expansion cylinder (11) is filled with fluid and pressurized to expand the expansion cylinder (11) in a radial direction; Filling and pressurizing the bulging box bottom to cause the bulging box bottom to bulge in the axial and radial directions; after the bulging is completed, the bulging box bottom is divided into a first box bottom (21) and a second box bottom (22); The first box bottom (21) and the second box bottom (22) are respectively installed at two ends of the barrel section assembly (1).

2. The method for manufacturing a launch vehicle bulging tank according to claim 1, characterized in that: The steps of sealing both ends of the bulging cylinder and then injecting and pressurizing the bulging cylinder to bulge the bulging cylinder in the radial direction include: The limiting cylinder (4) is arranged on the outside of the expansion cylinder (11); Connecting two auxiliary heads (5) to two ends of the bulging cylinder (11) respectively; The expansion cylinder (11) is filled and pressurized through the pressure port on the auxiliary sealing head (5), and the expansion cylinder (11) is expanded in its radial direction until its outer wall abuts against the inner wall of the limit cylinder (4), and then the filling and pressurization are stopped.

3. The method for manufacturing a launch vehicle bulging tank according to claim 2, characterized in that: The step of injecting and pressurizing the inside of the expansion cylinder (11) through the pressurizing port on the auxiliary sealing head (5), and stopping injecting and pressurizing after the expansion cylinder (11) expands in its radial direction until its outer wall abuts against the inner wall of the limiting cylinder (4) further comprises: The limiting cylinder (4) and the auxiliary sealing head (5) are removed.

4. The method for manufacturing a launch vehicle bulging tank according to claim 3, characterized in that: After the step of removing the limiting cylinder and the auxiliary head, the following steps are further included: A plurality of annular ribs (13) are arranged at intervals on the inner wall of the bulging cylinder (11) through a support member (114) along the axial direction of the bulging cylinder (11).

5. The method for manufacturing a bulging tank of a launch vehicle according to claim 4, characterized in that: After the step of arranging a plurality of annular ribs (13) at intervals on the inner wall of the bulging cylinder (11) along the axial direction of the bulging cylinder (11) through a support member (114), the method further comprises: Folding frames (12) are respectively arranged at both ends of the bulging cylinder (11) to form a cylinder section assembly (1).

6. The method for manufacturing a bulging tank of a launch vehicle according to claim 5, characterized in that: After the step of respectively installing the first box bottom (21) and the second box bottom (22) at both ends of the barrel section assembly (1), the method further includes: Guard plates (33) are arranged on both sides of the two ends of the corrugated plate (31), and an end frame (32) is arranged on one end surface of the corrugated plate (31) to form a connecting short shell; The two connecting short shells are respectively connected to the two flap frames (12) at both ends of the barrel section assembly (1).

7. The method for manufacturing a launch vehicle bulging tank according to claim 1, characterized in that: Before the step of sealing both ends of the bulging cylinder (11) and then injecting and pressurizing the bulging cylinder (11) to bulge the bulging cylinder (11) in its radial direction, the method further comprises: A plurality of longitudinal ribs (113) are arranged at intervals along the circumference of a cylindrical skin (111) on the inner wall of the skin (111), and thickened areas (112) are arranged at both ends of the skin (111) to form an expanded cylindrical body (11).

8. The method for manufacturing a bulging tank for a launch vehicle according to any one of claims 1 to 7, characterized in that: The step of injecting and pressurizing the bulging box bottom to make the bulging box bottom bulge in the axial direction and radial direction, and after the bulging is completed, dividing the bulging box bottom into a first box bottom (21) and a second box bottom (22) comprises: Connecting the first box bottom (21) and the second box bottom (22) to form the bulging box bottom; Adding pressure to the bottom of the bulging box to bulge the bottom of the bulging box; After the bulging is completed, the bulged box bottom is divided into the first box bottom (21) and the second box bottom (22).

9. The method for manufacturing a bulging tank for a launch vehicle according to claim 8, characterized in that: After the bulging is completed, the step of dividing the bulged box bottom into the first box bottom (21) and the second box bottom (22) further includes: An inlet door (23) is arranged on one of the first box bottom (21) and the second box bottom (22), and a liquid injection port (24) and a liquid outlet (25) are arranged on the other box bottom.

10. A launch vehicle bulging tank, manufactured by the launch vehicle bulging tank manufacturing method according to any one of claims 1 to 9, characterized in that: include: A barrel section assembly (1), the barrel section assembly comprising an expansion barrel (11) and two flaps (12), the two flaps (12) being arranged at two ends of the expansion barrel (11), the barrel section assembly further comprising annular ribs (13), the annular ribs (13) being arranged on the expansion barrel (11) at intervals along the axial direction of the expansion barrel (11); A box bottom assembly (2), the box bottom assembly comprising a first box bottom (21) and a second box bottom (22), the first box bottom (21) and the second box bottom (22) being respectively arranged at two ends of the barrel section assembly (1), and the barrel section assembly (1), the first box bottom (21) and the second box bottom (22) together form a storage cavity, and the storage cavity is suitable for storing liquid fuel; The short shell components (3) are two groups of short shell components, comprising two connected short shells, wherein the two connected short shells are respectively connected to the two flip frames (12).

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