A method for manufacturing a high-strength fiber-wound full composite high-pressure vessel

Abstract

The application provides a manufacturing method of a high-strength fiber winding full composite high-pressure container, which comprises the following steps: preparing a core mold for forming an inner cavity of the container, and preparing corresponding baffles, reinforcing abutting molds or reinforcing winding skirt molds according to the design of the container; installing the core mold on a chuck of a tubular winding machine, and winding the straight cylinder section, the head and the connecting thread of the high-pressure container on the core mold at one time; after the winding of the main body is completed, installing the corresponding reinforcing abutting mold or reinforcing winding skirt mold outside the head of the container, and performing reinforcing winding or winding of an integrated skirt on the head part; and performing curing treatment on the wound prefabricated body, and then removing the core mold and the auxiliary tool to obtain an integrally formed full composite high-pressure container. The application improves the overall bonding strength, saves the installation process of parts, eliminates the leakage caused by the bonding surface of the parts, and significantly reduces the weight of the high-pressure container.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology, and specifically relates to a method for manufacturing a high-strength fiber-wound all-composite high-pressure vessel. Background Technology

[0002] High-strength composite high-pressure vessels are essential devices in modern aviation, aerospace, weaponry, and new energy industries. Due to the significantly higher specific strength of resin-based composite materials reinforced with high-strength fiber winding compared to metals, high-performance solid rocket engine combustion chamber shells, hydrogen fuel cell vehicles, and high-pressure hydrogen storage tanks in aircraft are almost all made of high-strength fiber-wound composite materials. However, existing high-pressure vessels produced using winding technology still require metal heads and prefabricated metal or composite skirts. This introduces numerous heterogeneous material bonding surfaces, causing localized strength reductions, ultimately necessitating the use of even more fiber winding to compensate. The presence of these heterogeneous material bonding surfaces necessitates repeated calculations and extensive experimental verification during the design phase, complicating the manufacturing process, drastically increasing the number of quality control points, and adding numerous steps. Traditional technologies for producing fiber-wound reinforced resin-based composite high-pressure vessels result in a large number of heavy components, long manufacturing cycles, high manufacturing costs, and stringent quality control requirements, hindering low-cost and rapid manufacturing. This has become an obstacle to the widespread application of composite high-pressure vessels. Summary of the Invention

[0003] The purpose of this invention is to provide a method for manufacturing a high-strength fiber-wound all-composite high-pressure vessel, so as to solve the problem that the existing technology cannot achieve low-cost and rapid manufacturing.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a method for manufacturing a high-strength fiber-wound all-composite high-pressure vessel, comprising the following steps: Prepare a core mold for molding the inner cavity of a container, and prepare corresponding baffles, reinforcing templates or reinforcing wrapping skirts according to the container design; The mandrel is installed on the clamp of the tubular winding machine, and the pressure-bearing body of the high-pressure vessel is formed by winding on the mandrel in one go: straight section, end cap and connecting thread; After the basic completion of the pressure-bearing body, the corresponding reinforcing template or reinforcing skirt template is installed on the outside of the container head, and the head part is reinforced and wrapped or the integrated skirt is wrapped. The wound material is heated and cured, and then the core mold and auxiliary tools are removed to obtain an integrated, fully composite high-pressure container.

[0005] Furthermore, the tubular winding machine is a thermosetting resin wet tubular winding machine or a pre-impregnated thermoplastic resin fiber tubular winding machine.

[0006] Furthermore, the core mold is a sand mold, an integral metal mold, or a detachable, segmented metal core mold.

[0007] Furthermore, the core mold body of the integral metal mold is made of a fusible alloy.

[0008] Furthermore, the inner side of the end cap hole of the core mold used for forming internal threads is made of high-strength water-soluble resin sand of 200 mesh or higher or fusible alloy.

[0009] Furthermore, the mandrel of the core mold is provided with a positioning shoulder and threads for locking the baffle or mold on the outside of the end cap.

[0010] Furthermore, if only the end cap needs reinforcement, a reinforcement template is installed; if an integrated skirt needs to be laid, a reinforcement skirt-wrapping template is installed.

[0011] Furthermore, the reinforcing skirt mold adopts a metal patchwork structure or an integral structure prefabricated from resin sand or fusible alloy.

[0012] Furthermore, when laying the connecting threads, the longitudinal yarns are directly distributed, and each longitudinal yarn is laid to the thread forming surface for at least one pitch length.

[0013] Furthermore, the connecting thread is a trapezoidal thread or a sawtooth thread, with rounded corners at both the tip and root of the thread, and the radius of the rounded corners is not less than 0.3 mm; when the mating male thread with the connecting thread is made of metal, the cross-sectional area of ​​the connecting thread is greater than or equal to the cross-sectional area of ​​the mating metal male thread; when the connecting thread is a sawtooth thread located at the front end of the container, the inclined surface of its longitudinal section faces forward and the straight surface faces backward; when the connecting thread is a sawtooth thread located at the rear end of the container, the inclined surface of its longitudinal section faces backward and the straight surface faces forward.

[0014] Compared with the prior art, the present invention has the following technical effects: Compared with traditional fiber-wound high-pressure vessel technology, this invention completes the rapid winding of the straight section, end cap, connecting threads, and skirt of the high-pressure vessel in one step, completely overturning the traditional manufacturing method of fiber-wound high-pressure vessels. It eliminates the need for additional fabric cutting and reinforcement, saves the processing of prefabricated components such as metal end caps and independent skirts, as well as the assembly of the upper skirt, avoids damage to the wound fibers by the upper skirt, reduces the overall weight of the high-pressure vessel, significantly improves the bonding strength between the straight section and the skirt, eliminates leakage that may be caused by the joint surfaces of multiple components, greatly shortens the manufacturing cycle, significantly improves product quality, and reduces manufacturing costs. It is the preferred technical route for the rapid manufacturing of high-performance composite material high-pressure vessels.

[0015] The end cap is connected to the external surface via a thread. The internal thread of the end cap uses a direct longitudinal yarn distribution method, with both ends of each longitudinal yarn directly wound onto the outer surface of the thread for at least one pitch, occupying one or several full turns of the thread surface. In this way, all ends of the longitudinal yarns in the composite thread directly reach the surface of the internal thread, directly bearing the forces transmitted by the mating threads, without needing to transmit the forces through layers of resin with strength far lower than that of the fibers. Because the longitudinal yarns of this composite thread are continuous long fibers, the load-bearing capacity of the thread is much higher than that of composite thread obtained through machining. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a high-pressure gas storage cylinder made entirely of composite materials.

[0017] Figure 2 This is a process flow diagram for a high-pressure gas storage cylinder made entirely of composite materials.

[0018] Figure 3 This is a schematic diagram of a high-pressure vessel with end caps and skirts made entirely of composite materials.

[0019] Figure 4 This is a process flow diagram for a high-pressure vessel with end caps and skirts made entirely of composite materials.

[0020] Figure 5 This is a schematic diagram of a large-opening high-pressure vessel with a single-end end cap and skirt, made entirely of composite materials.

[0021] Figure 6 This is a process flow diagram for a large-opening high-pressure vessel with a single-end end cap and skirt, made entirely of composite materials.

[0022] Figure 7 This is a schematic diagram of a high-pressure pipe with double-ended large openings made of all composite materials.

[0023] Figure 8 This is a process flow diagram for a high-pressure pipe with double-ended large openings made of all-composite materials.

[0024] Figure 9 This is a flow chart of the laying process for a high-pressure vessel with end caps and skirts made of all-composite materials.

[0025] Wherein: 1—straight cylinder section, 2—front end cap, 3—rear end cap, 4—front thread, 5—rear thread, 6—front skirt, 7—rear skirt, 8—front end cap reinforcement, 9—rear end cap reinforcement, 10—mandrel, 11—sand mold, 12—front baffle, 13—rear baffle, 14—front locking nut, 15—rear locking nut, 16—front reinforcing skirt winding mold, 17—front skirt mold baffle, 18—rear reinforcing skirt winding mold, 19—rear skirt mold baffle, 20—screw. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings: This invention provides a method for manufacturing a high-strength fiber-wound all-composite high-pressure vessel. The method utilizes a tubular winding machine to rapidly wind the straight section, end caps, connecting threads, and skirt of the high-pressure vessel onto a mandrel in a single operation. After curing and demolding, a complete, integrated high-pressure vessel made entirely of composite materials can be obtained with minimal machining required. The process flow is as follows: i) Fabricate the core mold and reinforcing template or reinforcing skirt mold and baffle; ii) Mount the prepared mandrel onto the chuck of the tubular winding machine and wind the straight cylindrical section, end cap, and front and rear internal threads; iii) Reinforcing mold for the upper end cap or reinforcing skirt mold; iv) Reinforce the end cap by wrapping it with a continuous skirt; v) Curing.

[0027] ⅵ) Demolding.

[0028] The tubular wrapping machine is either a thermosetting resin wet tubular wrapping machine or a pre-impregnated thermoplastic resin fiber tubular wrapping machine.

[0029] The core mold can be a sand mold, an integral metal mold, or a detachable, segmented metal core mold.

[0030] The core mold body of the integral metal mold is made of fusible alloy.

[0031] The threads of the core mold head are made of high-strength water-soluble resin fine sand of 200 mesh or higher, or fusible alloy.

[0032] The mandrel has a locating shoulder and a locking thread on its outer end.

[0033] When laying the basic straight cylindrical section and end cap, a baffle is provided outside the end cap; when simply laying the end cap reinforcement, a reinforcement template is provided outside the end cap; when laying the end cap with skirt, a reinforcement skirting template is provided outside the end cap.

[0034] The inward-turning flange type reinforcing skirt mold adopts a metal splice-type combined structure or a pre-fabricated integral type made of resin sand or molten alloy.

[0035] The internal thread is laid out using a direct longitudinal yarn distribution method, with each longitudinal yarn being laid out to the thread surface for at least one pitch length.

[0036] The internal thread adopts a trapezoidal thread or a sawtooth thread, and the tip and root of the thread are rounded with a radius of not less than 0.3mm. When the male thread opposite to the internal thread is made of metal, the cross-sectional area of ​​the internal thread is greater than or equal to the cross-sectional area of ​​the metal male thread. When the current thread is a sawtooth thread, the inclined surface of its longitudinal section faces forward and the straight surface faces backward. When the subsequent thread is a sawtooth thread, the inclined surface of its longitudinal section faces backward and the straight surface faces forward.

[0037] A wet-layout tubular winding machine is used to rapidly wind the straight section, head, head connecting threads, and skirt of a high-pressure vessel in a single operation on a disappearing mandrel or a detachable segmented mandrel. After curing, a complete, integrated high-pressure vessel made entirely of composite materials can be obtained directly without almost any machining. This invention not only significantly improves production efficiency compared to existing fiber winding technologies, but also substantially reduces the number of components and significantly improves overall bonding strength compared to current high-pressure vessels using metal heads and independent skirts. It eliminates the need for component installation, removes potential leakage at component joints, and significantly reduces the weight of the high-pressure vessel.

[0038] Example 1: A manufacturing process for a high-pressure gas cylinder made entirely of composite materials.

[0039] Reference Figure 1 , Figure 2 and Figure 9 A method for manufacturing a high-pressure vessel made entirely of composite material using a wet-layout carbon fiber assembly is disclosed. This method employs a tubular layup machine to rapidly lay up the straight cylindrical section 1, front end cap 2, rear end cap 3, front thread 4, and rear thread 5 of the high-pressure vessel in a single operation on a sand mold. After curing and demolding, a complete, integrated high-pressure gas cylinder made entirely of composite material can be obtained directly without almost any machining. To achieve a better threaded connection, the thread profile adopts a wide, rounded trapezoidal shape with a radius of not less than 0.4 mm. The thread laying adopts a direct longitudinal yarn distribution method, meaning that each longitudinal yarn, except for the first longitudinal yarn which is laid up twice on the threaded surface of the mandrel, is only laid up once for each other.

[0040] According to the above basic process flow. The first step is to make the mandrel 10 using 304 stainless steel and to make the reinforcing templates with end caps at both ends. The so-called reinforcing template is the skirt-wrapping template with the skirt section removed.

[0041] The second step involves using heat-resistant, high-strength water-soluble resin sand to create the main surface of the core mold on the outside of the core shaft 10. Fine sand of 200 mesh or higher is required at the connection threads of the end caps.

[0042] The third step is to use a CNC lathe or engraving machine to finish the outer surface and threaded surface of the sand mold core.

[0043] The fourth step is to install the front and rear baffles at both ends of the mandrel and then install the mandrel onto the clamp of the wet tubular wrapping machine to perform the main body wrapping of the tank.

[0044] Fifth step: After the thickness of the main body is up to standard, remove the front and rear baffles, install the end cap reinforcement templates at both ends on the outside of the core mold end cap, and then first lay a layer of longitudinal yarn, and then wrap the circumferential yarn in the space between the template and the already wrapped end cap. With the help of the large tension of the circumferential yarn, the newly laid longitudinal yarn is squeezed to the edge of the space, while the space is filled with circumferential yarn.

[0045] The sixth step is to place the wrapped container along with the core mold onto the rotating shaft inside the heating chamber and heat and cure it according to the temperature and time specified in the curing process.

[0046] Step 7: Remove the end cap and reinforcement mold, pull out the mandrel, and use running water to dissolve the resin in the sand mold to break down the resin sand and separate it from the composite material to achieve demolding.

[0047] Step 8: Clean the inner cavity of the composite gas cylinder, especially the sand particles at the threaded end cap. After drying, machine the end face at the threaded end cap flat.

[0048] Example 2: Manufacturing process of high-pressure vessel with end caps and skirt made of all composite materials.

[0049] Reference Figure 3 , Figure 4 and Figure 9 A method for manufacturing a high-pressure vessel with a double-ended end cap and skirt, using a carbon fiber wet-layout composite material, is disclosed. The method employs a tubular layup machine to rapidly lay up the straight cylindrical section 1, front end cap 2, rear end cap 3, front thread 4, rear thread 5, front skirt 6, and rear skirt 7 of the high-pressure vessel in a single operation on a sand mold. After curing and demolding, a complete, integrated high-pressure vessel made entirely of composite material is obtained with minimal machining required. To achieve better thread connection, the thread profile uses a sawtooth shape, with the inclined surface of the longitudinal section facing outwards and the straight surface facing inwards. Both the thread tip and root are rounded with a radius not less than 0.3 mm. The thread laying adopts a direct longitudinal yarn distribution method. For the front thread 4, each longitudinal yarn, except for the first longitudinal yarn which has two pitches laid on the front thread surface of the mandrel, has one additional pitch laid outside the previous longitudinal yarn. For the rear thread 5, except for the first longitudinal yarn which has three pitches laid on the rear thread surface of the mandrel, has one additional pitch laid outside the previous longitudinal yarn.

[0050] According to the above basic process flow. The first step is to use 304 stainless steel to make the mandrel 10, the front baffle 12, and the rear baffle 13, and to make the front reinforcing skirt mold 17 and the rear reinforcing skirt mold 18 according to the design outline.

[0051] The second step involves using heat-resistant, high-strength water-soluble resin sand to create the main surface of the core mold on the outside of the core shaft 10. Fine sand of 400 mesh or higher is required at the connection threads of the end caps.

[0052] The third step is to use a CNC lathe or engraving machine to finish the outer surface and threaded surface of the sand mold core.

[0053] The fourth step is to install the front baffle 12 and the rear baffle 13 at both ends of the mandrel and install the mandrel onto the clamp of the wet tubular winding machine to wind the straight section 1 and the main body of the end cap.

[0054] Fifth, after the thickness of the container body's winding reaches the standard, install end-cap reinforcement molds and skirt winding molds on the outside of the end caps at both ends of the core mold. Then, first lay a layer of longitudinal yarn, followed by winding circumferential yarn in the space between the reinforcement skirt winding mold and the already wound end cap. The greater tension of the circumferential yarn compresses the newly laid longitudinal yarn to the edge of the space, while the space is filled with circumferential yarn. After the reinforcement at one end is wound, the reinforcement at the other end is wound. Then, the skirt is repeatedly laid and wound on the outside of the skirt winding molds at both ends. Finally, a layer of longitudinal yarn and a layer of circumferential yarn are uniformly laid and wound on the outside of the straight section and the front and rear skirts.

[0055] The fifth step is to place the wrapped container along with the core mold onto the rotating shaft inside the heating chamber and heat and cure it according to the temperature and time specified in the curing process.

[0056] Step 6: Remove the reinforcing skirt molds at both ends, pull out the mandrel, and use running water to dissolve the resin in the sand mold to break down the resin sand and separate it from the composite material to achieve demolding.

[0057] Step 7: Clean the inner cavity of the composite gas cylinder, especially the sand particles at the threaded end cap, and let it dry.

[0058] Step 8: Then, machine the end faces of the threaded openings of the front and rear end caps flat, drill through holes with countersunk holes on the side of the front skirt, drill and tap threaded holes on the rear skirt edge and install wire thread inserts.

[0059] Example 3: A manufacturing process for a large-opening high-pressure vessel with a single-end end cap and skirt, made entirely of composite materials. (Refer to...) Figure 5 , Figure 6 and Figure 9A method for manufacturing a large-opening high-pressure vessel with a single-end cap and skirt, made of 200mm outer diameter all-composite material using wet-layout PBO fiber, employs a tubular layup machine to rapidly lay up the straight cylindrical section 1, front cap 2, front thread 4, rear thread 5, and front skirt 6 of the high-pressure vessel in a single operation on a sand mold. After curing and demolding, only the end faces of the front cap 2, front skirt 6, and large opening need to be machined to directly obtain a complete, integrated high-pressure vessel made entirely of composite material. To achieve better thread connection, the front thread 2 at the cap end uses a relatively large rounded trapezoidal thread. The front thread is laid up using a direct longitudinal yarn distribution method, meaning that for each longitudinal yarn, except for the first longitudinal yarn which is laid up with two pitches on the front thread surface of the mandrel, the others are laid up with one additional pitch outside the previous longitudinal yarn. The rear thread 5 on the large opening side uses a sawtooth tapered thread, with the bevel of the longitudinal section facing backward and the straight surface facing forward. Both the thread tip and root are rounded with a radius of not less than 0.3mm.

[0060] According to the above basic process flow. The first step is to make the mandrel 10 using 304 stainless steel, and to make the front reinforcing skirt mold 17 and the front baffle 12 according to the design outline.

[0061] The second step is to use heat-resistant, high-strength water-soluble resin sand to make the main surface of the core mold on the outside of the core shaft 10. All outer surfaces, especially the connecting threads of the end caps, need to use fine sand of 400 mesh or higher.

[0062] The third step is to use a CNC lathe or engraving machine to finish the outer surface and threaded surface of the sand mold core.

[0063] The fourth step involves installing the front baffle 12 and the rear baffle 13 at both ends of the mandrel and mounting the mandrel onto the clamps of the wet tubular winding machine to wind the main body of the straight section 1 and the front end cap 2. The longitudinal section uses helical angled yarn laying, and both the longitudinal and circumferential yarns use PBO fibers of the same specification. The width of a single bundle of longitudinal yarn is less than 0.5 times the width of a single bundle of circumferential yarn.

[0064] Fifth step: After the thickness of the main body is reached, remove the front baffle 12, install the front reinforcing skirt mold 16 on the outside of the front end cap 2, then lay a layer of longitudinal yarn first, and then wrap circumferential yarn in the space between the front reinforcing skirt mold 12 and the already wrapped end cap. With the help of the larger tension of the circumferential yarn, the newly laid longitudinal yarn is squeezed to the edge of the space, while the space is filled with circumferential yarn. Then, the skirt is repeatedly laid on the outside of the reinforcing skirt mold, and finally, a layer of longitudinal yarn and a layer of circumferential yarn are uniformly laid on the outside of the straight section and the skirt.

[0065] The fifth step is to place the wrapped container along with the core mold onto the rotating shaft inside the heating chamber and heat and cure it according to the temperature and time specified in the curing process.

[0066] Step 6: Remove the front reinforcing skirt mold 12 and the rear baffle 13, pull out the mandrel, and use running water to dissolve the resin in the sand mold to disintegrate the resin sand and separate it from the composite material to achieve demolding.

[0067] Step 7: Clean the inner cavity of the composite gas cylinder, especially the sand particles at the threaded end cap, and let it dry.

[0068] Step 8: Flatten the end face of the threaded opening of the front end cap, and drill through holes with countersunk holes on the outer circumference of the front skirt 6. These holes are used to make screw connections with other components.

[0069] Example 4: A manufacturing process for a high-pressure pipe with double-ended large openings made entirely of composite materials. (Refer to...) Figure 7 , Figure 8 and Figure 9 This invention discloses a manufacturing process for a 122mm outer diameter carbon fiber reinforced epoxy resin all-composite double-ended large-aperture high-pressure pipe. A tubular winding machine is used to rapidly wind the straight section and connecting threads of the high-pressure vessel in a single operation on a detachable mandrel. After curing, a complete, integrated high-pressure pipe made entirely of composite material is obtained with almost no machining required. The thread winding adopts a direct longitudinal yarn distribution method. For each longitudinal yarn of the front thread 4 and the rear thread 5, except for the first longitudinal yarn which is wound with 3 pitches on the rear thread surface of the mandrel, the others are wound with 2 additional pitches outwards from the previous longitudinal yarn. The thread adopts a sawtooth tapered thread. The longitudinal section of the front thread 4 has the bevel facing forward and the straight surface facing backward, while the longitudinal section of the rear thread 5 has the bevel facing backward and the straight surface facing forward. Both the thread tip and root are rounded with a radius of not less than 0.5mm. In this way, all longitudinal yarns of the composite thread can directly bear the force transmitted by the paired threads, without the need for layer-by-layer resin transmission.

[0070] According to the above basic process flow. The first step is to make a mandrel using quenched and tempered 45# steel and to make a precision modular mandrel using electroslag remelted T302 mold steel. The overall mandrel is basically cylindrical in shape and has male threads at both ends.

[0071] The second step is to install the mandrel onto the clamp of the wet tubular winding machine and spray release agent. The third step involves fully drying the release agent, then laying the straight section and the threads at both ends. For the longitudinal section, a no-helix angle lay-up is used. Both the longitudinal and circumferential yarns are made of T1000 carbon fiber. The width of a single bundle of longitudinal yarn is twice the width of a single bundle of circumferential yarn. The first longitudinal lay-up is defined by the first three turns of the innermost threads at both ends. Each subsequent longitudinal lay-up is four turns longer than the previous one, meaning two additional turns at each end.

[0072] The fourth step is to place the wrapped container, along with the core mold, onto the rotating shaft inside the heating chamber and heat it for curing according to the temperature and time specified in the curing process.

[0073] The fifth step is to disassemble the core mold of the composite high-pressure pipe to release it from the mold.

[0074] The above description is merely the most typical embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The listed data and directions are only for describing the working principle of the present invention and do not represent necessary values ​​or specific directions. Any equivalent changes or substitutions that can be easily conceived by those skilled in the art of composite fiber winding within the technical scope disclosed in the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A method for manufacturing a high-strength fiber-wound all-composite high-pressure vessel, characterized in that, Includes the following steps: Prepare a core mold for molding the inner cavity of a container, and prepare corresponding baffles, reinforcing templates or reinforcing wrapping skirts according to the container design; The mandrel is installed on the clamp of the tubular winding machine, and the straight cylindrical section, end cap and connecting threads of the high pressure vessel are formed by winding on the mandrel in one go. After the basic completion of the pressure-bearing body, the corresponding reinforcing template or reinforcing skirt template is installed on the outside of the container head, and the head part is reinforced and wrapped or the integrated skirt is wrapped. The wound material is heated and cured, and then the core mold and auxiliary tools are removed to obtain an integrated, fully composite high-pressure container.

2. The method for manufacturing a high-strength fiber-wound all-composite high-pressure vessel according to claim 1, characterized in that, The tubular wrapping machine is a thermosetting resin wet tubular wrapping machine or a pre-impregnated thermoplastic resin fiber tubular wrapping machine.

3. The method for manufacturing a high-strength fiber-wound all-composite high-pressure vessel according to claim 1, characterized in that, The core mold can be a sand mold, an integral metal mold, or a detachable, segmented metal core mold.

4. The method for manufacturing a high-strength fiber-wound all-composite high-pressure vessel according to claim 3, characterized in that, The core mold body of the integral metal mold is made of fusible alloy.

5. The method for manufacturing a high-strength fiber-wound all-composite high-pressure vessel according to claim 1, characterized in that, The inner side of the end cap hole of the core mold, used for forming the internal thread, is made of high-strength water-soluble resin sand of 200 mesh or higher or a fusible alloy.

6. The method for manufacturing a high-strength fiber-wound all-composite high-pressure vessel according to claim 1, characterized in that, The core mold's mandrel has a positioning shoulder and threads for locking the baffle or mold on the outside of the end cap.

7. The method for manufacturing a high-strength fiber-wound all-composite high-pressure vessel according to claim 1, characterized in that, If only the end cap needs reinforcement, install a reinforcement template; if an integrated skirt needs to be laid, install a reinforcement skirt-wrapping template.

8. The method for manufacturing a high-strength fiber-wound all-composite high-pressure vessel according to claim 7, characterized in that, The reinforcing skirt mold adopts a metal patchwork structure or an integral structure prefabricated from resin sand or fusible alloy.

9. The method for manufacturing a high-strength fiber-wound all-composite high-pressure vessel according to claim 1, characterized in that, When laying the connecting thread, the longitudinal yarns are directly distributed, and each longitudinal yarn must be laid to the thread forming surface for at least one pitch.

10. The method for manufacturing a high-strength fiber-wound all-composite high-pressure vessel according to claim 1, characterized in that, The connecting thread is a trapezoidal thread or a sawtooth thread, with rounded corners at both the tip and root of the thread, and the radius of the rounded corners is not less than 0.3 mm. When the mating male thread of the connecting thread is made of metal, the cross-sectional area of ​​the thread profile of the connecting thread is greater than or equal to the cross-sectional area of ​​the mating metal male thread. When the connecting thread is a sawtooth thread located at the front end of the container, the inclined surface of its longitudinal section faces forward and the straight surface faces backward. When the connecting thread is a sawtooth thread located at the rear end of the container, the inclined surface of its longitudinal section faces backward and the straight surface faces forward.

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