Preparation method of square composite material launch canister
By performing special treatment and winding on the inner and outer walls of the launch cylinder, the problems of wear and insufficient rigidity of the inner wall of the launch cylinder are solved, which significantly improves its airtightness and strength, extends its service life, and meets the needs of modern warfare.
Patent Information
- Application Number
- CN202411771544.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-02-28
AI Technical Summary
The inner wall of the existing launcher is prone to wear, resulting in reduced airtightness and insufficient rigidity, which can easily deform during the launch process, resulting in piston stagnation.
The inner wall of the mold is processed by hand pasting, and a rubber layer is laid on the inner wall. A winding layer is formed on the outer wall of the mold through annular winding and spiral winding processes. A square emitter cylinder is prepared by combining hand pasting and winding processes.
It significantly improves the airtightness, strength and service life of the launch cylinder, enhances the stability and reliability of the overall structure, and meets the needs of precise strikes and rapid deployment in modern warfare.
Smart Images
Figure CN119526781A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of launch tubes, and in particular to a method for preparing a square composite material launch tube. Background Art
[0002] In small-scale local wars with high technology and information technology, accurate reconnaissance information, intelligent remote operation and precise destruction function have become key factors in determining the battlefield. In missile weapon systems and aerospace delivery systems, launch technology has always played a very important role. For light and small UAVs, flexible launch and rapid deployment in complex areas can be achieved through airborne delivery, vehicle launch, rocket boost and canister launch. Among them, canister launch has the characteristics of compact structure and easy carrying, which is suitable for rapid deployment in complex terrain and general vehicles; and the launch canister, as an important part of the missile launch device, has the function of storage and transportation, ensuring the safe transportation of missiles and extending the service life of missiles; on the other hand, as a launch device, it is equipped with launch rails and other devices inside, which can shorten the launch preparation time and improve the emergency response capability of the missile weapon system.
[0003] However, at present, the launch tubes on the market are basically made of glass fiber in one piece, and the inner wall of the launch tube is a composite material layer. The inner wall is easily worn during the launching process, resulting in reduced air tightness of the launch tube. In addition, the launch tube is not rigid enough, and it is easy to deform during the launching process, which causes the piston to get stuck during the launching process. Summary of the invention
[0004] The main purpose of the present invention is to solve the above-mentioned technical problems to a certain extent, and proposes a method for preparing a square composite material launch tube, which includes the following steps: first, the mold is processed; then the inner wall of the mold is processed by hand lay-up process; then a rubber layer is laid on the inner wall of the mold; then a winding layer is formed on the outer wall of the mold by circumferential winding and spiral winding process; then the wound mold is cured; then the cured mold is demolded and machined to obtain a launch tube body; finally, the launch tube body is subjected to a water pressure test.
[0005] In some embodiments, during mold processing, the mold is tested for its straightness less than 0.1 mm and its surface roughness less than Ra1.6 to ensure the straightness and surface quality of the mold. After meeting the test conditions, the mold is cleaned twice with a mold cleaning agent, left to air for 30 minutes, and then the sealing agent is applied twice and left to air for 30 minutes, and then the release agent is applied three times and left to air for 30 minutes.
[0006] In some embodiments, fibers cut to appropriate sizes are arranged in the prepared glue and fully soaked, and then the fiber cloth is laid on the inner wall and flange end of the mold by hand lay-up, and the fiber cloth is laid flat and wrinkle-free; after the hand lay-up is completed, the release cloth, non-porous isolation film, pressure plate, and vacuum belt film are laid on the inner wall surface in sequence, and cured under normal temperature and vacuum conditions for 2-8 hours; and the cured inner wall of the mold is polished.
[0007] In some embodiments, epoxy resin and polytetrafluoroethylene powder are used as raw materials, mixed in a ratio of 100:1, and ultrasonically mixed for 1 minute to obtain a glue solution; polytetrafluoroethylene powder has good self-lubricating properties and can significantly enhance the wear resistance of the resin after mixing with the resin. By using the glue mixture, the wear resistance of the inner wall is improved, thereby increasing the service life of the launch tube.
[0008] In some embodiments, the fiber cloth is carbon fiber cloth or glass fiber cloth.
[0009] In some embodiments, the inner wall of the mold after curing and polishing is cleaned with anhydrous ethanol and dried, and then epoxy structural adhesive is brushed on the inner wall surface and left to air for 10-30 minutes, and then the rubber layer coated with structural adhesive is paved on the inner wall surface, wherein the material pieces overlap by 10-15mm and the cut overlap by 5-10mm during paving. After pasting, the material pieces are rolled with a scraper and the overlapping areas are ironed flat with an electric iron. The rubber layer improves the weather resistance and anti-aging ability of the launch tube, and enhances the stability and reliability of the overall structure.
[0010] In some embodiments, the rubber layer is made of EPDM or nitrile rubber, and the thickness of the rubber layer is 0.2-2 mm.
[0011] In some embodiments, when winding the outer wall of the mold, the mold body is first wound. Before winding, the carbon fiber is impregnated with a winding resin and pre-baked at 80°C for 2 hours. Then, the carbon fiber is wound around the outer wall of the mold body by circumferential winding and spiral winding. The circumferential winding and spiral winding are performed alternately, and the ratio of the number of winding layers of the circumferential winding: spiral winding is 3:1-5:1. The winding process adopts a tension reduction system, and the tension decreases by 1N for each winding layer. A layer of carbon fiber cloth is added to the four corners of the mold body for every 3-5 layers of winding. After the outer wall of the mold body is wound, a pressure plate is installed on the surface of the winding layer, and the flange end position of the mold is reserved. Then, the carbon fiber is wound circumferentially at the flange end position, and the tension is reduced during the winding process. After the winding is completed, a heat shrink film is wrapped around the area of the winding flange end.
[0012] In some embodiments, the carbon fiber layer is made of T700 grade carbon fiber.
[0013] In some embodiments, the winding resin uses E51A resin and curing agent E51B in a mass ratio of 100:50-100:100, and the resin is stirred for 10-20 minutes after preparation.
[0014] In some embodiments, the mold after winding is cured by curing at 50-80°C for 1-3 hours, then at 110-130°C for 4-6 hours, and rotating at a speed of 3-10 rpm during the curing process. After curing, the mold is cooled to below 40°C and taken out of the oven.
[0015] In some embodiments, after the product returns to room temperature, the product is placed on a demolding machine, the demolding tooling is installed on the product surface, the demolding machine is started to eject the mold core, and after demolding, a through hole is processed on the flange end of the mold and the outer surface of the mold is polished with sandpaper to obtain a launch cylinder.
[0016] The above technical solution provided by this application has the following advantages compared with the prior art: The overall performance of the launch tube of the present invention is significantly improved, so that it has better air tightness, higher strength and longer service life, meeting the needs of precise strikes and rapid deployment in modern warfare.
[0017] The present invention processes the inner wall of the mold through the hand lay-up process; and then forms a winding layer on the outer wall of the mold through the circumferential winding and spiral winding processes, so that the hand lay-up process is combined with the winding process to prepare a square launching tube, thereby solving the problem of inconsistent winding layer thickness of the square structure during the winding process.
[0018] The present invention lays a rubber layer on the inner wall, thereby improving the wear resistance of the inner wall of the launch tube, reducing the wear during the launching process, and extending the service life of the launch tube.
[0019] The present invention significantly reduces the circumferential deformation of the launch tube during the launching process and enhances the rigidity of the launch tube by increasing the ratio of the number of winding layers of circumferential winding to spiral winding and using high modulus carbon fiber for circumferential winding.
[0020] The flange end of the present invention adopts a composite material combined with a rubber layer to solve the problems of insufficient strength of the connecting flange and poor air tightness of the flange. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0022] Figure 1 The process flow chart of the method for preparing the square composite material launch tube of the present invention is as follows; Figure 2 It is a structural diagram of the square composite material launching tube of the present invention. DETAILED DESCRIPTION
[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0024] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.
[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0026] like Figure 1-2 As shown, the present invention proposes a method for preparing a square composite material launch tube, which includes at least steps S1-S7, as follows: Step S1, firstly process the mold.
[0027] Exemplarily, during mold processing inspection, its straightness is less than 0.1mm, and the mold surface roughness is less than Ra1.6 to ensure the straightness and surface quality of the mold; after meeting the inspection conditions, it is cleaned twice with a mold cleaning agent, left to air for 30 minutes, and then coated with a sealing agent twice and left to air for 30 minutes, and then coated with a release agent three times and left to air for 30 minutes.
[0028] Step S2, treating the inner wall of the mold by hand lay-up process.
[0029] Exemplarily, fibers cut to appropriate sizes are arranged in the prepared glue solution and fully saturated, and then the fiber cloth is laid on the inner wall and flange end of the mold by hand lay-up, and the fiber cloth is laid flat and wrinkle-free; after hand lay-up is completed, release cloth, non-porous isolation film, pressing plate, vacuum belt film are laid on the inner wall surface in sequence, and cured under normal temperature and vacuum conditions for 2-8 hours; and the cured inner wall of the mold is polished; when laying the impregnated fiber cloth on the inner wall and flange end of the mold, the fiber cloth is required to be laid flat and wrinkle-free, and the fiber cloth is tightly fitted to the flange end face of the mold without voids.
[0030] It is worth noting that in this embodiment, the fiber cloth uses carbon fiber cloth or glass fiber cloth, and epoxy resin and polytetrafluoroethylene powder are used as raw materials. After mixing in a ratio of 100:1, ultrasonic mixing is performed for 1 minute to obtain a glue solution; polytetrafluoroethylene powder has a good self-lubricating effect, and after mixing with the resin, it can significantly enhance the wear resistance of the resin. By using the glue mixture, the wear resistance of the inner wall is improved, thereby increasing the service life of the launch tube.
[0031] Step S3, laying a rubber layer on the inner wall of the mold, wherein laying the rubber layer on the inner wall improves the wear resistance of the inner wall of the launch tube, reduces the wear during the launch process, and extends the service life of the launch tube.
[0032] Exemplarily, the inner wall of the cured and polished mold is cleaned with anhydrous ethanol and dried, and then epoxy structural adhesive is brushed on the inner wall surface and left to air for 10-30 minutes, and then the rubber layer coated with structural adhesive is laid on the inner wall surface, wherein the sheets overlap by 10-15mm and the cut overlap by 5-10mm. After the sheets are laid, the sheets are rolled out with a scraper and the overlapping areas are ironed flat with an electric iron. Release cloth, pressure-sensitive tape, film and other unnecessary materials are not allowed to be brought in between the sheets. The rubber layer improves the weather resistance and aging resistance of the launch tube, and enhances the stability and reliability of the overall structure.
[0033] In this embodiment, the rubber layer is made of EPDM or nitrile rubber material, and the thickness of the rubber layer is 0.2-2 mm.
[0034] Step S4, then forming a winding layer on the outer wall of the mold through circumferential winding and spiral winding processes, wherein the circumferential deformation of the launch tube during the launching process is significantly reduced and the rigidity of the launch tube is enhanced by increasing the ratio of the number of winding layers of circumferential winding and spiral winding and using high modulus carbon fiber for circumferential winding.
[0035] Exemplarily, when winding the outer wall of the mold, the mold body is first wound. Before winding, the carbon fiber is impregnated with a winding resin and pre-baked at 80°C for 2 hours. Then, the carbon fiber is wound around the outer wall of the mold body by circumferential winding and spiral winding. The circumferential winding and spiral winding are performed alternately, and the ratio of the number of winding layers of the circumferential winding: spiral winding is 3:1-5:1. The winding process adopts a tension reduction system, and the tension decreases by 1N for each winding layer. When the mold body is wound for every 3-5 layers, a layer of carbon fiber cloth is added at the four corners. A layer of carbon fiber cloth is added at the four corners to eliminate the problem of uneven winding layers. After the outer wall of the mold body is wound, a pressure plate is installed on the surface of the winding layer, and the flange end position of the mold is reserved. Then, the carbon fiber is wound circumferentially at the flange end position, and the tension is reduced during the winding process. After the winding is completed, a heat shrink film is wrapped around the area of the winding flange end.
[0036] In this embodiment, the carbon fiber layer adopts T700 grade carbon fiber, and the winding resin adopts E51A resin and curing agent E51B in a mass ratio of 100:50-100:100. After the resin is prepared, it is stirred for 10-20 minutes. Before winding, the carbon fiber is immersed in the winding resin and pre-baked. The pre-baked carbon fiber ensures the quality and consistency of the winding layer, thereby improving the structural strength and durability of the launch tube.
[0037] Furthermore, the inner wall of the mold is processed by hand lay-up process; and then a winding layer is formed on the outer wall of the mold by circumferential winding and spiral winding processes, so that the hand lay-up process is combined with the winding process to prepare a square launch tube, thereby solving the problem of inconsistent winding layer thickness of the square structure during the winding process.
[0038] Step S5, then the wound mold is cured to ensure a good curing effect of the carbon fiber layer, thereby improving the overall performance and durability of the launch tube.
[0039] Exemplarily, curing the wound mold includes curing at 50-80°C for 1-3 hours, then curing at 110-130°C for 4-6 hours, and rotating at a speed of 3-10 rpm during the curing process, and cooling to below 40°C after curing and taking out of the oven.
[0040] Step S6, demoulding the mold after the curing treatment and machining to obtain the launch cylinder.
[0041] Exemplarily, after the product returns to room temperature, the product is placed on a demolding machine, the demolding tooling is installed on the product surface, the demolding machine is started to eject the mold core, and after demolding, a through hole is processed on the flange end of the mold and the outer surface of the mold is polished with sandpaper to obtain a launch cylinder.
[0042] In this embodiment, a gantry-type demoulding machine is used for demoulding, which simplifies the demoulding process, reduces the risk of damage to the launch tube, and ensures product quality.
[0043] Step S7, finally, the launching cylinder is subjected to a water pressure test.
[0044] For example, after the launch tube is connected to the water pressure tooling, water is slowly injected into the tooling. When the pressure reaches the design pressure, it is maintained for 5-10 minutes. If the deformation of the launch tube is no greater than the design requirements and there is no leakage, the product is qualified. The performance of the launch tube is verified through the water pressure test to ensure the airtightness and structural integrity of the launch tube, which meets the high standards of the military and aerospace fields.
[0045] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.
Claims
1. A method for preparing a square composite material launch tube, characterized in that: The following steps are involved: Treat the mold; Treat the inner wall of the mold through hand lay-up process; Laying a rubber layer on the inner wall of the mold; Forming a winding layer on the outer wall of the mold by hoop winding and spiral winding processes; Curing the wound mold; Demolding the mold after curing and machining to obtain a launch barrel; Conduct water pressure test on the launch tube.
2. The method for preparing a square composite material launch tube according to claim 1, characterized in that: The mold processing test shows that its straightness is less than 0.1mm and the mold surface roughness is less than Ra1.6 to ensure the straightness and surface quality of the mold; after meeting the test conditions, use a mold cleaning agent to clean it twice, let it air for 30 minutes, then apply a sealant twice and let it air for 30 minutes, then apply a release agent three times and let it air for 30 minutes.
3. The method for preparing a square composite material launch tube according to claim 1, characterized in that: Arrange the fibers cut to appropriate sizes in the prepared glue and allow it to be fully soaked, then lay the fiber cloth on the inner wall and flange end of the mold by hand lay-up, and make the fiber cloth lay flat and wrinkle-free; after hand lay-up, lay the release cloth, non-porous isolation film, pressure plate, vacuum belt film on the inner wall surface in sequence, and cure it under normal temperature and vacuum conditions for 2-8 hours; and polish the cured inner wall of the mold.
4. The method for preparing a square composite material launch tube according to claim 3, characterized in that: Epoxy resin and polytetrafluoroethylene powder are used as raw materials, mixed in a ratio of 100:1, and then ultrasonically mixed for 1 minute to obtain a glue solution.
5. The method for preparing a square composite material launch tube according to claim 1, characterized in that: The inner wall of the cured and polished mold is cleaned with anhydrous ethanol and dried, then epoxy structural adhesive is brushed on the inner wall surface and left to air for 10-30 minutes, and then the rubber layer coated with structural adhesive is laid on the inner wall surface. When laying, the material pieces overlap by 10-15mm and the cut overlap by 5-10mm. After pasting, the material pieces are rolled with a scraper and the overlapping area is ironed flat with an electric iron.
6. The method for preparing a square composite material launch tube according to claim 5, characterized in that: The rubber layer is made of EPDM or nitrile rubber material, and the thickness of the rubber layer is 0.2-2 mm.
7. The method for preparing a square composite material launch tube according to claim 1, characterized in that: When winding the outer wall of the mold, the mold body is wound first. Before winding, the carbon fiber is impregnated with the winding resin and pre-baked at 80°C for 2 hours. Then, the carbon fiber is wound on the outer wall of the mold body by circumferential winding and spiral winding. The circumferential winding and spiral winding are performed alternately, and the ratio of the number of winding layers of the circumferential winding: spiral winding is 3:1-5:
1. The winding process adopts a tension reduction system, and the tension decreases by 1N for each winding layer. A layer of carbon fiber cloth is added to the four corners for every 3-5 layers of winding of the mold body. After the outer wall of the mold body is wound, a pressure plate is installed on the surface of the winding layer, and the flange end position of the mold is reserved. Then, the circumferential winding is performed at the flange end position, and the tension is reduced during the winding process. After the winding is completed, a heat shrink film is wrapped around the area of the winding flange end.
8. The method for preparing a square composite material launch tube according to claim 7, characterized in that: The winding resin uses E51A resin and curing agent E51B in a mass ratio of 100:50-100:
100. After the resin is prepared, it is stirred for 10-20 minutes.
9. The method for preparing a square composite material launch tube according to claim 1, characterized in that: The mold after winding is cured at 50-80°C for 1-3 hours, then at 110-130°C for 4-6 hours, and rotated at a speed of 3-10 revolutions per minute during the curing process. After curing, the mold is cooled to below 40°C and taken out of the oven.
10. The method for preparing a square composite material launch tube according to claim 1, characterized in that: After the product returns to room temperature, place the product on the demoulding machine, install the demoulding tooling on the product surface, start the demoulding machine to eject the mold core, and after demoulding, process the through hole on the flange end of the mold and polish the outer surface of the mold with sandpaper to obtain the launch cylinder.