CN115076591A - Stainless steel II-type gas cylinder and manufacturing method thereof - Google Patents
Stainless steel II-type gas cylinder and manufacturing method thereof Download PDFInfo
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- CN115076591A CN115076591A CN202210630189.7A CN202210630189A CN115076591A CN 115076591 A CN115076591 A CN 115076591A CN 202210630189 A CN202210630189 A CN 202210630189A CN 115076591 A CN115076591 A CN 115076591A
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 28
- 239000010935 stainless steel Substances 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000007789 gas Substances 0.000 claims abstract description 48
- 229910052751 metal Inorganic materials 0.000 claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000002131 composite material Substances 0.000 claims abstract description 18
- 238000004804 winding Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000005728 strengthening Methods 0.000 claims abstract description 10
- 239000000835 fiber Substances 0.000 claims abstract description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 5
- 239000004917 carbon fiber Substances 0.000 claims abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000003733 fiber-reinforced composite Substances 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000000137 annealing Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000000452 restraining effect Effects 0.000 claims description 2
- 238000009987 spinning Methods 0.000 claims 2
- 238000007789 sealing Methods 0.000 claims 1
- 239000011347 resin Substances 0.000 abstract 1
- 229920005989 resin Polymers 0.000 abstract 1
- 238000003878 thermal aging Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
- F17C1/02—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge involving reinforcing arrangements
- F17C1/04—Protecting sheathings
- F17C1/06—Protecting sheathings built-up from wound-on bands or filamentary material, e.g. wires
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/04—Hardening by cooling below 0 degrees Celsius
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/05—Size
- F17C2201/056—Small (<1 m3)
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/01—Reinforcing or suspension means
- F17C2203/011—Reinforcing means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0634—Materials for walls or layers thereof
- F17C2203/0636—Metals
- F17C2203/0639—Steels
- F17C2203/0643—Stainless steels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0634—Materials for walls or layers thereof
- F17C2203/0658—Synthetics
- F17C2203/0663—Synthetics in form of fibers or filaments
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2209/00—Vessel construction, in particular methods of manufacturing
- F17C2209/21—Shaping processes
- F17C2209/2154—Winding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
- F17C2223/036—Very high pressure (>80 bar)
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
The invention discloses a low-cost and high-strength stainless steel II-type gas cylinder structure and a typical manufacturing method thereof. The II-type gas cylinder disclosed by the invention is made of a 301 series stainless steel and high-strength fiber (preferably resin-based carbon fiber material) composite material, wherein the stainless steel cylinder body is in a shape of a cylinder with hemispherical ends and a straight middle part, the wall thickness of the stainless steel cylinder body is consistent, and the high-strength unidirectional composite material only winds the cylinder section part of the stainless steel in a circumferential direction to play a role in strengthening the circumferential strength of the gas cylinder. The invention discloses a typical manufacturing method of a II-shaped gas cylinder, which comprises the following steps: firstly, manufacturing a seamless bottle body based on a 301 series stainless steel material, closing up two ends, and manufacturing a metal bottle body with spherical shells at two ends and a cylindrical shell at the middle part, wherein the spherical shells and the cylindrical shell have the same thickness; then, performing high-pressure bulging in a cryogenic environment of a preferred liquid nitrogen environment, and constraining the cylinder section of the stainless steel cylinder body by using an outer die, wherein the bulging amplitude is preferably increased by 10-15% of the diameter of the cylinder section; thirdly, carrying out thermal aging on the stainless steel cylinder after bulging at the temperature of 430 ℃ for 8 hours for further strengthening; fourthly, winding a high-strength unidirectional fiber reinforced composite material on the outer ring direction of the cylinder section of the stainless steel cylinder body, and curing; and finally, carrying out water pressure pre-tightening bulging at normal temperature to obtain a final finished product.
Description
Technical Field
The invention relates to the field of pressure vessels, and discloses a low-cost and high-strength stainless steel II-type gas cylinder and a manufacturing method thereof, which can realize the structural efficiency of a III-type gas cylinder and reduce the manufacturing cost by more than 50%.
Background
The high-pressure gas cylinder is a common pressure container device in modern industry and scientific research. The gas cylinder structure in China is divided into four types of CNG-I type, CNG-II type, CNG-III type and CNG-IV type, which are hereinafter referred to as I to IV type gas cylinders. The type I is a metal gas cylinder, the type II is a composite material circumferential winding reinforced metal gas cylinder, the type III is a metal liner composite material winding gas cylinder, and the type IV is a non-metal liner composite material winding gas cylinder. The composite material proportion of the four gas cylinders is gradually increased, the general structural efficiency is higher and higher, and meanwhile, the manufacturing cost is higher and higher. At present, the type III gas cylinder or the expensive type I titanium alloy gas cylinder is mainly used in the high-end gas cylinder application field in China, and the common type I gas cylinder is also largely used in the low-end civil field. The type IV gas cylinder is not yet put into commercial application on a large scale because the technical maturity is not high enough.
The main reason that the higher the metal material ratio, the lower the structural efficiency of the gas cylinder is that the specific strength of the metal material is obviously lower than that of the composite material, for example, austenitic stainless steel has the ultimate strength of only about 600MPa and the density of 7.9g/cm ^3, while the ultimate strength of the common epoxy resin-based T700 carbon fiber composite material can reach 2000MPa and the density of only 1.6g/cm ^3, and the specific strength of the latter is 16.5 times that of the former.
The annealed 301 austenitic stainless steel has an excellent low-temperature strain strengthening phenomenon in a liquid nitrogen environment at the temperature of-196 ℃, and after about 10% of low-temperature strain strengthening is generated, the normal-temperature yield strength and the tensile strength of the material are both obviously improved. Test data show that after the 301 stainless steel is subjected to strain strengthening at the temperature of-196 ℃, the ultimate strength can reach 2068MPa after the aging at the temperature of 430 ℃. However, because the deep cooling steel rolling process is usually adopted for reinforcement, the equipment and process cost is high, and the defects of inconvenient welding and the like exist, the technology is only applied to aerospace structure products in small scale abroad.
The invention combines the cryogenic strengthening advantage of 301 series stainless steel and the high strength advantage of composite materials, adopts a seamless metal bottle body processing technology, avoids a welding technology, and realizes and discloses a low-cost II-type gas bottle structure scheme with the structural efficiency equivalent to that of a III-type gas bottle and a manufacturing method thereof.
Disclosure of Invention
The invention mainly solves the contradiction of low structural efficiency of the II-type gas cylinder and high manufacturing cost of the III-type gas cylinder, and discloses a low-cost II-type gas cylinder structural scheme with structural efficiency equivalent to that of the III-type gas cylinder and a manufacturing method thereof.
The beneficial effects of the invention are:
1) the structural efficiency is high, the ultimate strength of the finished metal material can reach 2000MPa, and the comprehensive structural efficiency is equivalent to that of a III-type gas cylinder;
2) the cost is low, the weight of low-cost stainless steel in the finished gas cylinder accounts for about 80%, the weight of high-cost composite material accounts for about 20%, and the material cost is greatly reduced;
3) the process is simple, and the stainless steel seamless bottle body process, the fiber winding II-type bottle process and the high-pressure pre-tightening process are mature processes. The cryogenic bulging process in the liquid nitrogen environment is easy to implement at low cost.
The invention discloses a II-type gas cylinder which comprises the following structural components and is manufactured as follows:
1) the gas cylinder is a typical II-type gas cylinder structure consisting of 301 series stainless steel cylinder bodies and a composite material winding reinforcing layer, wherein the front bottom and the rear bottom of each metal cylinder body are preferably spherical shells, and the whole metal cylinder body is preferably equal in thickness;
2) the metal bottle body is processed by a seamless process according to the size before bulging, and annealing treatment is carried out before bulging;
3) strengthening the metal bottle body by using a cryogenic bulging process in a preferred liquid nitrogen environment, and restraining a cylinder section of the metal bottle body by using a die to ensure that the front bottom and the rear bottom and the cylinder section reach a certain strengthening degree;
4) carrying out aging treatment at 430 ℃ after cryogenic bulging strengthening to further enhance the strength of the metal bottle body;
5) winding unidirectional fiber reinforcement conforming materials on the cylinder section of the metal cylinder body in the circumferential direction according to the process standard of the II-type gas cylinder, and curing;
6) and (3) after solidification, performing room-temperature high-pressure pre-tightening, tightly attaching the metal bottle body and the composite material reinforcing layer, and keeping a certain pre-tightening internal force.
Drawings
Section of II-type gas cylinder made of 301 series stainless steel in figure 1
FIG. 2 is a schematic view of a deep cooling bulging process
The parts in the drawings are numbered as follows:
301 stainless steel cylinder
② composite material hoop winding layer
③ front bottom of spherical shell
Fourthly, the rear bottom of the spherical shell
Fifthly, air inlet and outlet
Expansion mould
Seventhly liquid nitrogen container
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
The embodiment of the invention comprises the following steps:
example (b): A130L stainless steel II type 35MPa gas cylinder and a manufacturing process thereof are explained as follows:
1) the volume of the gas cylinder is 130L, and the design pressure is 35 MPa;
2) firstly, a 301 stainless steel seamless bottle body with the inner diameter of 281mm and the wall thickness of 4.0mm is manufactured, wherein the length of a cylinder section is 1400mm, the inner surfaces of two ends are oval bottoms with the major half axis (the axial direction of the gas cylinder) of 160mm and the minor half axis (the radial direction of the gas cylinder) of 140.5 mm;
3) annealing the metal bottle body;
4) sleeving a cylinder section of the metal bottle body on a high-strength detachable mould with the inner diameter of 327mm, and placing the high-strength detachable mould in a liquid nitrogen tank;
5) pressurizing the metal bottle body to 70MPa by using liquid nitrogen until the metal bottle body is expanded to an equal-thickness bottle body with the inner diameter of 160mm and the wall thickness of 3.5 mm;
6) taking the metal out of the liquid nitrogen tank, and removing the die;
7) aging the metal bottle body for 8 hours at 430 ℃;
8) winding a 5mm carbon fiber composite material on the cylinder section of the metal bottle body;
9) curing the composite material winding layer;
10) and (5) pre-tightening the internal pressure of the gas cylinder by using the water pressure of 45MPa, and finishing the processing.
11) The obtained gas cylinder has the internal pressure of 35MPa, the internal pressure of blasting is about 85MPa, the volume is 130L, the weight of the product is 70kg, the fatigue life exceeds 1.5 ten thousand times, and the performance index of the type-III carbon fiber composite gas cylinder is reached.
According to the embodiment, the high-cost-performance gas cylinder with the performance equivalent to that of a III-shaped gas cylinder and the cost equivalent to that of a II-shaped gas cylinder is obtained by adopting the structural scheme and the manufacturing method disclosed by the invention.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A II-type gas cylinder structure scheme. The method is characterized in that: firstly, the bottle body is made of 301 series stainless steel materials with equal thickness; secondly, the cross section of the bottle body is in a track shape, namely, spherical shells at two ends and a straight cylinder shape at the middle part; thirdly, the metal bottle body cylinder section is wound and reinforced by adopting a unidirectional fiber reinforced material.
2. A typical manufacturing method of a type II gas cylinder. The method is characterized in that: firstly, the stainless steel cylinder body is manufactured by adopting a seamless process; secondly, the metal bottle body is subjected to bulging strengthening in a cryogenic environment which is preferably a liquid nitrogen environment; thirdly, aging the expanded metal bottle body for 8 hours at 430 ℃ (for 301 series stainless steel); fourthly, axially winding the straight cylinder section of the metal bottle body by using a unidirectional fiber composite material; finally, performing water pressure high-pressure pre-tightening at normal temperature.
3. The constant thickness 301 series stainless steel bottle of claim 1, wherein: firstly, the metal bottle body is made of 301 series stainless steel, including 301,301L, 301LN and other material marks, and other metal materials with high extensibility and ultimate strength reaching or exceeding 2000MPa level can be selected; secondly, the metal bottle body is processed by adopting a seamless process, and firstly, a seamless steel tube is adopted to be spun and then two ends are spun and closed; the cross section of the metal bottle body is preferably in an ideal track shape, namely, the two ends are in an ideal spherical shell shape, and the middle part is in a straight cylinder shape; fourthly, the metal bottle body is of a structure with equal thickness.
4. Unidirectional fibre reinforcement according to claim 1, characterized in that: firstly, winding a unidirectional fiber reinforced composite material in a circumferential direction in a common mode of a II-type gas cylinder; secondly, designing the winding thickness according to a design method of a II-type gas cylinder; and thirdly, the high-strength carbon fiber composite material is firstly used for winding.
5. The stainless steel cylinder of claim 2, made by a seamless process, wherein: firstly, adopting the processes including but not limited to seamless steel tube, spinning, bulging, hot spinning sealing and the like to prepare a seamless bottle body with equal thickness; secondly, before the next step of deep cooling bulging, the diameter of the bottle body is smaller than a design value, and the diameter before bulging is designed according to the deep cooling bulging rate; and thirdly, annealing treatment is carried out before the next step of deep cooling bulging.
6. The metal bottle of claim 2, wherein said metal bottle is further expanded in a cryogenic environment, preferably in a liquid nitrogen environment, wherein said cryogenic environment comprises: firstly, the diameter of the metal bottle body before bulging is slightly smaller than the designed diameter; secondly, the deep cooling bulging in a liquid nitrogen environment is firstly used; for 301 series stainless steel materials, the diameter bulging rate of the cylinder section is preferably within the range of 10-15% during cryogenic bulging in a liquid nitrogen environment; and fourthly, after the cylinder section of the metal bottle body reaches the designed bulging size, restraining the cylinder section from bulging by using the die, and continuously pressurizing until the bulging pressure is about 2 times of that when the cylinder section is in contact with the die, so that the front spherical bottom and the rear spherical bottom are bulged to the degree equivalent to that of the cylinder section.
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| CN202210630189.7A CN115076591B (en) | 2022-06-06 | 2022-06-06 | Stainless steel II-type gas cylinder and manufacturing method thereof |
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| CN113432030A (en) * | 2021-06-07 | 2021-09-24 | 浙江蓝能燃气设备有限公司 | Method for manufacturing bottle type container with stainless steel liner and carbon fiber wound completely |
| CN113909806A (en) * | 2021-09-23 | 2022-01-11 | 浙江蓝能燃气设备有限公司 | Preparation method of large-diameter stainless steel welded liner carbon fiber fully-wound bottle type container |
| CN216591027U (en) * | 2021-09-23 | 2022-05-24 | 浙江蓝能燃气设备有限公司 | Large-diameter stainless steel welding inner container carbon fiber full-winding bottle type container |
| CN114413163A (en) * | 2022-01-17 | 2022-04-29 | 光年探索(江苏)空间技术有限公司 | Intersecting spherical shell lining composite material winding pressure container |
| CN114542947A (en) * | 2022-03-15 | 2022-05-27 | 光年探索(江苏)空间技术有限公司 | Method for manufacturing bulging of intersecting spherical shell pressure container |
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