A method of forming a composite material launch tube

Abstract

The present application relates to the field of launching tube forming technology, and particularly relates to a composite material launching tube forming method, comprising the following steps: S1: wet method once winding of glass fiber yarn; the glass fiber yarn is wound on the launching tube body part by wet winding method, two layers of reinforcing step parts are wound on the tail reinforcing area of the launching tube body, and a first preformed body of the launching tube body is formed; S2: milling cutter slot operation of guide rail is performed; S3: wet method secondary winding is performed to form a tail flange, an end face step, a head flange and an intermediate ring hoop, and thus a second preformed body of the launching tube body is formed; S4: demolding operation is performed, and a finished launching tube is obtained after demolding; and S5: a mounting groove is machined on the machined end face of the finished launching tube, and drilling operation is performed. The present application can improve the forming efficiency of the launching tube, reduce the forming difficulty, solve the machining problem of the long and deep guide rail with a slender inner diameter, reduce the workload of later machining, ensure the fiber strength of the product, and enhance the bearing strength and internal pressure bearing capacity of the tube body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of launching tube forming, and specifically provides a forming method of a composite launching tube. BACKGROUND

[0002] The launching tube is an important component of a projectile body, and is a special cylindrical device for storing, transporting and launching a missile. At present, the application of the launching tube is gradually increasing at home and abroad. The composite launching tube has been widely applied due to its excellent performance of light weight and high strength. In the prior art, the following patents relate to the manufacturing and forming of the composite launching tube:

[0003] 1. An invention patent with the patent number 202010824801.5 and the patent name "a forming method of a composite concentric launching tube" includes the following steps: mold preparation; raw material preparation; inner tube ablation layer laying: the glass fiber-phenolic resin prepreg tape is laid on the mold in a tension ring, then a vacuum bag is punched to compact, and a hot press tank is used for pre-solidification forming; after solidification and cooling, the outer surface of the inner tube ablation layer is cleaned; the inner tube structure layer is laid; the longitudinal rib is bonded; the longitudinal rib wrapping structure layer and longitudinal rib fireproof ablation layer are laid; the outer tube protective layer and outer tube structure layer are laid; the ring rib is installed; the obtained inner tube and the obtained outer tube are cleaned and then sleeved to obtain a composite concentric launching tube. The launching tube manufactured in the present application has light structure and high strength, but only glass fiber and epoxy resin are used for winding forming in the present patent, and the launching tube has limited strength without entering the hot press tank.

[0004] 2. An invention patent application with the patent number 202211717091.1 and the patent name "a composite launching tube for cold launching and a preparation method thereof" adopts a wet winding process to pre-bury two end metal pieces, and the positions of the metal pieces are ensured by a mandrel of a mandrel mold and a positioning tool; the carbon fiber structure layer and the glass fiber layer both adopt a winding process; an anti-static layer and a sealing layer are designed. The scheme can improve the connection strength of the metal piece and the composite tube body, but the processing procedure is relatively complicated, the operation difficulty is relatively high, the forming method is relatively low, and the post-processing workload is large.

[0005] 3. An invention patent application with the patent number 202211356266.0 and the patent name "a launching tube with a guide rail and a forming process" includes a resin-based composite launching tube and a composite guide rail, the composite guide rail includes a first wear-resistant material layer and a second resin-based composite material layer, and the composite guide rail is adhered to the inner wall of the resin-based composite launching tube through the second resin-based composite material layer. The application also provides a forming process of the launching tube with the guide rail. The application solves the connection problem between the wear-resistant guide rail and the resin-based composite launching tube, the product has good integrity, and the pressure resistance of the launching tube can be easily ensured, but the manufacturing steps of the scheme are relatively complicated, the strength is limited, and the guide rail groove is difficult to process.

[0006] From the above, the prior art by the design and manufacture of the launch tube, can improve the performance of the product to a certain extent, but there are still complex process, fiber strength, guide rail groove processing difficulty, the problem of large amount of post-machining. Therefore, how to design a production efficiency, less processing procedures, product strength reliable, processing difficulty of composite material launch tube forming method, is the problem to be solved at present. SUMMARY

[0007] The present application provides a kind of composite material launch tube forming method, can improve the bearing strength, improve processing efficiency, solve the problem of large amount of post-machining of special-shaped guide rail processing difficulty.

[0008] The present application provides a kind of composite material launch tube forming method, and specifically includes the following steps:

[0009] S1: glass fiber yarn wet method once winding;

[0010] S11: glass fiber yarn is wound by wet winding mode and is used to the launch tube body part;

[0011] S12: continue wet winding to form the two-layer reinforcing step part of launch tube in the tail strengthening area of launch tube body, form launch tube body once preformed body;

[0012] S13: launch tube body once preformed body is cured and formed;

[0013] S2: milling cutter groove operation of guide rail;

[0014] S21: milling cutter groove for placing guide rail is processed on two-layer reinforcing step;

[0015] S22: guide rail is pre-buried in milling cutter groove;

[0016] S3: cloth wet method secondary winding;

[0017] S31: weave cloth is wound on two-layer reinforcing step and forms cloth winding tail flange;

[0018] S32: cloth winding end face step is wound on tail flange close to outer end, cloth winding head flange is wound on the end of launch tube body once preformed body away from end face step, cloth winding intermediate ring hoop is wound on launch tube body once preformed body between end face step and head flange;To form launch tube body secondary preformed body;

[0019] S33: launch tube body secondary preformed body is cured and formed;

[0020] S4: demoulding operation is carried out, and launch tube finished product is obtained after demoulding.

[0021] S5: Machining installation groove on the machined end face of the launch canister finished product, and performing drilling operation.

[0022] Further, the launch canister body part in S11 is subjected to winding operation on a metal mold, and specifically includes the following sub-steps:

[0023] S111: Installing front end head and rear end head on front end spindle and rear end spindle of the body of the metal mold respectively;

[0024] S112: Clamping the front end spindle and the rear end spindle by using a long winding machine;

[0025] S113: Starting from the end of one end spindle and crossing the other end spindle, the front end head and the rear end head are both required to be wound with glass fiber yarn, and the adjacent wound glass fiber yarns are wound back at the front end head or the rear end head to continuously re-wind.

[0026] Further, the height of the two-layer reinforcing step is determined according to the height of the guide rail in S12; and in S13, the launch canister body one-time preformed body with the mold is put into a curing oven for heating and curing integrated molding.

[0027] Further, the method for milling the cutter groove on the two-layer reinforcing step in S21 is as follows: first, more than two elongated fiber blocks are milled away by using a side milling cutter according to requirements, and an elongated inner diameter type milling cutter groove with an arc is formed on the two-layer reinforcing step; and the guide rail in S22 is an arc structure matched with the milling cutter groove.

[0028] Further, before the guide rail is pre-embedded, the guide rail is wrapped with anti-adhesion material, and then pre-embedded into the milling cutter groove; after the guide rail is pre-embedded, a demolding pin is installed on the outer end face of the guide rail, and the demolding pin is located inside the outer surface of the two-layer reinforcing step.

[0029] Further, the cloth winding tail flange in S31 includes the following steps:

[0030] S311: Placing the launch canister body one-time preformed body with the pre-embedded guide rail on the long winding machine, and clamping the front end spindle and the rear end spindle by using the long winding machine;

[0031] S312: Installing an annular fixing member at the pre-embedded guide rail on the two-layer reinforcing step to assist in limiting the guide rail;

[0032] S313: Slowly winding the plain cloth while brushing glue on the two-layer reinforcing step, removing the annular fixing member after the pre-embedded guide rail is completely fixed by the plain cloth, and then opening the fast winding mode to fast wind the plain cloth until the tail flange is wound to the required thickness after the pre-embedded guide rail is covered by the plain cloth soaked with resin and opened to the tension and wound one circle on the two-layer reinforcing step.

[0033] Furthermore, the winding steps of the end face step, head flange, and middle hoop in S313 are as follows:

[0034] S3131: Cut the plain fabric into the required widths for the end steps, head flanges, and middle hoop;

[0035] S3132: Place the winding machines at the corresponding positions and start the winding operation.

[0036] Furthermore, the thickness of the end face step and the middle hoop is determined by the size of the product's external interface; the thickness of the head flange is greater than the thickness of the middle hoop.

[0037] Furthermore, the demoulding step in S4 is as follows:

[0038] S41: Cut off the front end head and the rear end head;

[0039] S42: A stripper baffle is provided on the outer end surface of the head flange, and a stripper traction device is used to clamp the front spindle;

[0040] S43: The metal mold is pulled by the demoulding machine to move in a direction away from the second-layer reinforcement step. At this time, the demoulding machine baffle blocks the product, completing the demoulding;

[0041] S44: Knock the embedded guide rail out of the milling cutter groove using the demoulding pins.

[0042] Furthermore, in S5, the excess on both end faces of the product after demolding in S4 is first cut off, and then a plurality of T-slots are machined on the end face steps, and a plurality of bolt through holes matching the T-slots are machined on the side end faces of the end face steps and the tail flange.

[0043] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0044] The present invention completes the first layer of winding by wet winding glass fiber resin, and adopts secondary plain cloth winding to strengthen the tail area, which can quickly complete the winding of the tail reinforcement flange and the end face step. By combining the secondary cloth winding axial fiber with the primary winding yarn, the machinability of the end face is greatly improved. The side drilling large hole to install the T-bolt can bear a large axial tensile force. The cylinder has high bearing strength and strong internal pressure bearing capacity.

[0045] The present invention pre-buries the guide rail by winding two layers of reinforcing steps and then opening milling cutter grooves on the second layers of reinforcing steps. The glass fiber yarn winding layer, the tail reinforcement area winding layer, and the plain cloth winding layer are secondary solidified and formed, which solves the processing problem of slender inner diameter, medium and deep long guide rails and ensures the continuity of the fiber winding layer. This processing method can be applied to various special-shaped structure guide rails and is highly practical.

[0046] The application sets front end seal head and rear end seal head when carrying out glass fiber yarn wet method once winding, can make yarn back at front end seal head and rear end seal head when cross winding, can guarantee yarn winding continuity, realizes cross winding, variable diameter winding, variable angle winding form, guarantees fiber strength.Simultaneously, the application processes tail flange and end face step in tail strengthening area, further guarantees tail strengthening area thickness and bearing capacity, guarantees whole winding high strength while improving winding local thickening work efficiency, narrow plain cloth secondary winding step thickening is uniform, does not exist too much redundancy, greatly reduces later machining grinding composite cylinder body external dimension workload. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 It is a structure schematic view of the launch tube body one-time preform provided by the embodiment of the application;

[0048] Figure 2 It is a milling machine milling slot structure schematic view provided by the embodiment of the application;

[0049] Figure 3 It is a pre-buried guide rail installation structure schematic view provided by the embodiment of the application;

[0050] Figure 4 It is a secondary cloth wet winding structure schematic view provided by the embodiment of the application;

[0051] Figure 5 It is a product demolding process schematic view provided by the embodiment of the application;

[0052] Figure 6 It is a product demolding completion structure schematic view provided by the embodiment of the application;

[0053] Figure 7 It is a product tail flange machine processing end face T-shaped groove, drilling and finished product schematic view provided by the embodiment of the application;

[0054] Figure 8 It is a yarn winding schematic view when the glass fiber yarn wet method once winding provided by the embodiment of the application.

[0055] The reference signs in the drawings include: two-layer reinforcing step 1, launch tube body one-time preform 2, milling cutter slot 3, guide rail 4, tail flange 5, end face step 6, head flange 7, middle ring hoop 8, launch tube body secondary preform 9, front end spindle 10, rear end spindle 11, front end seal head 12, rear end seal head 13, demolding machine 14, demolding machine baffle 15, main body glass fiber yarn 16, metal mold body 17, T-shaped groove 18, inner hexagonal bolt 19. DETAILED DESCRIPTION

[0056] In the following, reference will be made to the drawingsFigures 1-8 Describe the embodiment of the present invention. In the following description, the same modules are represented by the same reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, their detailed description will not be repeated.

[0057] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following Figures 1-8 It should be understood that the specific embodiments described herein are only used to illustrate the present invention and do not constitute a limitation of the present invention.

[0058] A method for forming a composite material launch tube comprises the following steps:

[0059] S1: Glass fiber yarn wet winding once.

[0060] S11: Use glass fiber yarn to wrap the main body of the launch tube by wet winding. The main body of the launch tube is the main glass fiber yarn 16 shown in the figure. The specific steps include the following:

[0061] S111: The front end head 12 and the rear end head 13 are respectively installed on the front end spindle 10 and the rear end spindle 11 of the metal mold body. The metal mold includes a metal mold body 17. The front end spindle 10 and the rear end spindle 11 are respectively arranged at the axial ends of the metal mold body 17. The front end head 12 and the front end spindle 10 are locked by a keyway, and the rear end head 13 and the rear end spindle 11 are locked by a keyway.

[0062] S112: A long winding machine is used to clamp the front spindle 10 and the rear spindle 11. In this embodiment, a 10-meter long winding machine is used.

[0063] S113: Starting from the end of one main shaft, cross winding is performed towards the other main shaft. Both the front end seal 12 and the rear end seal 13 need to be wound with glass fiber yarn, and the adjacent loops of glass fiber yarn are wound back at the front end seal 12 or the rear end seal 13 to be continuously wound. Figure 8 As shown, starting from point B1, yarn winding begins in the direction of S1. When the yarn reaches the front end cap 12, the yarn also needs to be wound on the front end cap 12, and then it is wound back in the direction of S2 at point B2. The yarn winding diagram in the figure is only for reference. In actual operation, it is necessary to continue winding from point B3 toward the rear end cap 13, and after winding on the rear end cap 13, it is wound back again. Repeat the cross-loop winding until the desired thickness is reached. In this embodiment, after the production is completed, the thickness d1 of the launch tube body is 8-11mm.

[0064] S12: Continue wet winding in the tail reinforcement area of the launch can body to form the second layer reinforcement step 1 part of the launch can, i.e. winding glass fiber yarn on one side of the tail reinforcement area where the main body glass fiber yarn 16 is located, the wound glass fiber yarn is the second layer reinforcement step 1, and the second layer reinforcement step 1 and the main body glass fiber yarn 16 together form a primary preform 2 of the launch can body, and the thickness d2 of the glass fiber yarn at the tail reinforcement area after processing the second layer reinforcement step 1 is 20.5 mm.

[0065] S13: Solidification molding of the primary preform 2 of the launch can body, the height of the second layer reinforcement step 1 is wound according to the height of the guide rail 4, and the primary preform 2 of the launch can body is heated and solidified in the solidification furnace with the mold.

[0066] S2: Milling cutter slot 3 operation of the guide rail 4, the height of the guide rail 4 is 20 mm.

[0067] S21: Milling cutter slot 3 for placing the guide rail 4 is processed on the second layer reinforcement step 1. The method for processing the milling cutter slot 3 on the second layer reinforcement step 1 is as follows: first, use a side milling cutter to mill off two or more elongated fiber blocks according to requirements, and at the same time form an elongated inner diameter milling cutter slot 3 with an arc on the second layer reinforcement step 1, the guide rail 4 is a structure with an arc matched with the milling cutter slot 3, and the size of the milling cutter slot 3 is 800 mm (length) * 80 mm (width) * 20 mm (height).

[0068] S22: Embed the guide rail 4 in the milling cutter slot 3, the guide rail 4 is made of aluminum alloy or plastic. Before embedding the guide rail 4, the guide rail 4 needs to be wrapped with anti-adhesion material, and then the guide rail 4 is embedded into the milling cutter slot 3. In this embodiment, the guide rail 4 is wrapped with Teflon, and the guide rail 4 is fitted into the milling cutter slot 3. Teflon can prevent the guide rail 4 from adhering to the milling cutter slot 3, and facilitate demolding. After the guide rail 4 is embedded, a demolding pin is installed on the outer end surface of the guide rail 4, and the demolding pin is located inside the outer surface of the second layer reinforcement step 1 as a whole to avoid interference. The demolding pin is used for demolding the guide rail 4 in the subsequent process, and the guide rail 4 is directly demolded by applying force to the demolding pin, which can avoid damage to the product and the guide rail 4 caused by applying force to the guide rail 4. The demolding pin is not shown in the figure.

[0069] In this embodiment, two guide rails 4 and two milling cutter slots 3 are provided, and those skilled in the art can also make other numbers of guide rails 4 and milling cutter slots 3 according to actual conditions, and the guide rails 4 and milling cutter slots 3 can also be arranged at other positions, such as a plurality of milling cutter slots 3 can be arranged in the circumferential direction, and the guide rails 4 can be embedded in three groups or four groups.

[0070] S3: Wet method secondary winding.

[0071] S31: Winding a wide plain cloth on the second layer reinforcement step 1 and forming a cloth winding tail flange 5. The cloth winding tail flange 5 includes the following steps:

[0072] S311: Place the launch tube body one-time pre-form 2 with embedded guide rail 4 on a 10-meter long winding machine, and clamp the front end spindle 10 and the rear end spindle 11 through the long winding machine.

[0073] S312: Install a ring-shaped fixing member at the pre-embedded guide rail 4 on the two-layer reinforced step 1 to assist in limiting the guide rail 4. The ring-shaped fixing member can be a ring-shaped strap or a tool clamp. The ring-shaped fixing member prevents the guide rail 4 from falling off.

[0074] S313: Slowly wrap the plain cloth while applying glue at the two-layer reinforced step 1. After the pre-embedded guide rail 4 is completely fixed by the plain cloth, remove the ring-shaped fixing member. The ring-shaped strap can be cut or the tool clamp can be removed. After the plain cloth, which is soaked in resin and has an opening tension, covers the pre-embedded guide rail 4 and is wrapped around the two-layer reinforced step 1 once, switch to a fast wrapping mode to quickly wrap the plain cloth until the tail flange 5 is wrapped to the desired thickness. During the wrapping of the plain cloth, a variable-angle wrapping method is adopted. After the tail flange 5 is wrapped, the overall thickness d3 of the fiberglass yarn and the plain cloth at the tail reinforced area is 35.5 mm.

[0075] The wrapping steps of the end face step 6, the head flange 7, and the intermediate ring 8 are as follows:

[0076] S3131: Cut the plain cloth into the required widths for the end face step 6, the head flange 7, and the intermediate ring 8.

[0077] S3132: Place the cloth wrapping machine at the corresponding positions and start the cloth wrapping operation. The thicknesses of the end face step 6 and the intermediate ring 8 are determined by the dimensions of the product outer interface. According to the characteristics of the mold ejection, the head flange 7 area has a certain taper in the metal mold. The inner diameter of the head ejection port is large, and the inner diameter of the tail area is small. The head ejection position needs to be wrapped thicker to facilitate the next ejection. The thickness of the head flange 7 is greater than that of the intermediate ring 8.

[0078] S32: Wrap the end face step 6 on the tail flange 5 near the outer end, wrap the head flange 7 on the launch tube body one-time pre-form 2 away from the end face step 6, and wrap the intermediate ring 8 between the end face step 6 and the head flange 7 on the launch tube body one-time pre-form 2 to form the launch tube body two-time pre-form 9. After the end face step 6 is wrapped, the overall thickness d4 of the fiberglass yarn and the plain cloth at the tail reinforced area is 50 mm. After the head flange 7 is wrapped, the overall thickness d5 of the fiberglass yarn and the plain cloth at the head flange 7 is 35 mm.

[0079] S33: Cure and form the launch tube body two-time pre-form 9. The launch tube body two-time pre-form 9 with the mold enters the curing oven for secondary curing and forming.

[0080] S4: Demolding operation is performed to obtain the finished launch tube. Demolding steps are as follows:

[0081] S41: Cut off the front end head 12 and the rear end head 13, and grind the cut end faces flat.

[0082] S42: A stripper baffle 15 is provided at the outer end surface of the head flange 7, and a stripper 14 traction device is used to clamp the front spindle 10.

[0083] S43: If Figure 5 As shown, the metal mold is pulled by the demoulding machine 14 along the direction shown by F and moves as a whole toward the direction away from the second-layer reinforcement step 1. At this time, the demoulding machine baffle 15 blocks the product and completes the demoulding. Figure 6 shown.

[0084] S44: knock the embedded guide rail 4 out of the milling cutter groove 3 through the demoulding nails.

[0085] S5: If Figure 7 As shown, mounting slots and drilling are performed on the machined end faces of the finished launch tube. First, the excess on both end faces of the product after demolding in S4 is removed. Then, multiple T-slots 18 are machined on the end step 6. Multiple bolt holes that match the T-slots 18 are machined on the side faces of the end step 6 and the tail flange 5. Hexagon socket bolts 19 are installed in the bolt holes. In this embodiment, 24 T-slots and 24 bolt holes are machined.

[0086] The tail of a large composite launch tube is usually connected to the power unit, and the tail area needs to withstand large impacts and lateral loads. If the fiber layer thickness in the tail area is more than 30 mm, it is difficult to achieve large load-bearing through general wet yarn winding. Drilling threaded holes on the flange end face in the fiber direction or pre-embedded wire screw sleeves are difficult to ensure fiber strength. In this embodiment, the first layer of yarn is wet wound, and after curing, the tail area adopts a secondary cloth winding process. Plain cloth winding with a width of more than 1 meter can quickly complete high-strength winding with a thickness of 10-20 mm and above, with high specific strength. Plain cloth winding fully utilizes the axial and circumferential fiber strength of the fiber, has high machining precision, and excellent axial (lateral) load-bearing performance.

[0087] The internal structure of the launch tube is typically designed based on the missile body, requiring multiple long guide rail slots at the tail. The 300-350mm diameter of the launch tube is difficult to machine. Ordinary boring and milling cutters are incapable of machining, and custom-made, extended boring cutters struggle to machine grooves deeper than 600mm. In this embodiment, the first layer of yarn is wet-wound, and after curing, the milling cutter slots 3 are milled out using a mold. The length of the milling cutter slots 3 is not restricted, and can accommodate the requirements of the guide rails 4. This avoids the difficulty of machining slender, deep, or long guide rails 4 with an inner diameter. Prefabricated guide rails (600-1000mm long) are then wrapped with Teflon to create a clearance fit. These can then be wound a second time on a large-scale winding machine, ensuring fiber continuity, tension, and angle.

[0088] The barrel of a large composite launch tube has multiple installation interfaces, including the tail flange 5, the head flange 7, and multiple intermediate hoops 8, all of which are more than 10 mm thick. Wet yarn circumferential winding is prone to yarn slippage, and winding to a specified thickness is slow. The yarn steps on both sides leave a large margin for pushing and squeezing, and the amount of subsequent machining is huge. In this embodiment, standard wide cloth is cut according to different step widths to produce narrow plain cloth of a specific width. The narrow plain cloth is then subjected to secondary synchronous rapid wet winding. The winding machine applies tension, and adjacent intermediate hoops 8, tail flange 5, and head flange 7 can all be wound synchronously. The thickened end steps of the tail flange 5 and head flange 7 can be wound quickly, which can improve processing efficiency and reduce the workload of subsequent machining and grinding of the composite tube's external dimensions.

[0089] The finished composite material launch tube is a tube with high strength and rigidity, such as Figure 7 The finished cylinder shown can withstand an internal pressure of ≥4Mpa and has a design safety factor of 2.0. The cylinder body is wrapped with high-strength glass fiber yarn as a whole, with a wall thickness of 8-11mm. The cylinder is designed at both ends, with a head flange 7 and a tail reinforcement flange area. The wall thickness of the tail reinforcement flange area exceeds 35mm. A circle of 24 3.6.5 T-bolt slots is arranged laterally on the rear end face of the tail reinforcement flange, which can withstand a tensile force of 200KN. Multiple groups of intermediate hoops 8 of different specifications are arranged on other parts of the cylinder body. The wall thickness of the intermediate hoops 8 exceeds 20mm. A milling cutter groove 3 is opened on the inner wall of the rear flange of the tail reinforcement area. The milling cutter groove 3 does not penetrate the cylinder structure and is more than 800mm deep from the end face of the tail flange 5. The milling cutter groove 3 is 80mm wide and 20mm high, which can withstand impact loads.

[0090] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0091] The above detailed description of the application is not intended to limit the scope of the application. Various other changes and modifications of the application can be made by those skilled in the art without departing from the scope of the application.

Claims

1. A method for forming a composite material launch tube, characterized in that: The steps include: S1: Glass fiber yarn wet winding once; S11: Use glass fiber yarn to wrap the launch tube body by wet winding method; S12: Continue wet winding at the tail reinforcement area of ​​the launch tube body to form a second-layer reinforcement step (1) of the launch tube body, thereby forming a primary preform (2) of the launch tube body; S13: curing the primary preform (2) of the launch tube body; S2: Perform milling cutter groove (3) operation on guide rail (4); S21: machining a milling cutter groove (3) for placing a guide rail (4) on the second-layer reinforcement step (1); S22: pre-embed the guide rail (4) in the milling cutter groove (3); S3: Secondary winding with wet cloth; S31: Wrapping a plain cloth on the second-layer reinforcement step (1) to form a cloth-wrapped tail flange (5); S32: Wrapping an end face step (6) near the outer end of the tail flange (5), wrapping a head flange (7) at the end of the launch tube body primary preform (2) away from the end face step (6), and wrapping an intermediate hoop (8) located between the end face step (6) and the head flange (7) on the launch tube body primary preform (2); thereby forming a launch tube body secondary preform (9); S33: curing the secondary preform (9) of the launch tube body; S4: Demolding operation is performed to obtain the finished launch tube; S5: Process the mounting groove and perform drilling operations on the machined end face of the finished launch tube.

2. The method for forming a composite material launch tube according to claim 1, characterized in that: In S11, the launch tube body is wound on the metal mold, which specifically includes the following sub-steps: S111: Installing a front end cover (12) and a rear end cover (13) on the front end spindle (10) and the rear end spindle (11) of the metal mold body respectively; S112: using a long winding machine to clamp the front spindle (10) and the rear spindle (11); S113: Starting from the end of one end main shaft, cross-loop winding is performed toward the other end main shaft, and both the front end head (12) and the rear end head (13) need to be wound with glass fiber yarn, and the wound adjacent loops of glass fiber yarn are wound back at the front end head (12) or the rear end head (13) to be continuously wound back.

3. The method for forming a composite material launch tube according to claim 2, characterized in that: In S12, the height of the second layer of reinforcing steps (1) is wound according to the height of the guide rail (4); during curing in S13, the primary preform (2) of the launch tube body is brought into a curing furnace with the mold for heating and curing to form an integral body.

4. The method for forming a composite material launch tube according to claim 3, characterized in that: The method for machining the milling cutter groove (3) on the second-layer reinforcement step (1) in S21 is as follows: first, two or more slender fiber blocks are milled off with a side milling cutter according to the requirements, and at the same time, a slender inner diameter milling cutter groove (3) with an arc is formed on the second-layer reinforcement step (1); the guide rail (4) in S22 is a structure with an arc that is matched with the milling cutter groove (3).

5. The method for forming a composite material launch tube according to claim 4, characterized in that: In S22, before the guide rail (4) is embedded, the guide rail (4) is wrapped with an anti-adhesion material and then embedded in the milling cutter groove (3); after the guide rail (4) is embedded, a demoulding pin is installed on the outer end surface of the guide rail (4), and the demoulding pin is located on the inner side of the outer surface of the second-layer reinforcement step (1).

6. The method for forming a composite material launch tube according to claim 5, characterized in that: The cloth wrapping of the tail flange (5) in S31 includes the following steps: S311: placing the primary preform (2) of the launch tube body with the guide rail (4) pre-embedded therein on a long winding machine, and clamping the front end main shaft (10) and the rear end main shaft (11) by the long winding machine; S312: Installing an annular fixing member at the embedded guide rail (4) on the second-floor reinforced step (1) to assist in limiting the guide rail (4); S313: Brush glue and slowly wrap the plain cloth on the second-layer reinforcement step (1). After the embedded guide rail (4) is completely fixed by the plain cloth, remove the annular fixing piece; after the plain cloth soaked in resin and with tension is covered with the embedded guide rail (4) and wrapped around the second-layer reinforcement step (1) once, start the fast winding mode and quickly wind the plain cloth until the tail flange (5) is wound to the required thickness.

7. The method for forming a composite material launch tube according to claim 6, characterized in that: The winding steps of the end face step (6), head flange (7) and middle hoop (8) of S313 are as follows: S3131: Cut the plain fabric into the required widths of the end step (6), the head flange (7), and the middle hoop (8), i.e., cut the plain fabric into narrow plain fabric; S3132: Place the winding machines at the corresponding positions and start the winding operation.

8. The method for forming a composite material launch tube according to claim 7, characterized in that: The thickness of the end face step (6) and the intermediate hoop (8) is determined by the size of the product's external interface; the thickness of the head flange (7) is greater than the thickness of the intermediate hoop (8).

9. The method for forming a composite material launch tube according to claim 8, characterized in that: The demoulding steps in S4 are as follows: S41: cutting off the front end head (12) and the rear end head (13); S42: a stripper baffle (15) is provided at the outer end surface of the head flange (7), and a stripper (14) traction device is used to clamp the front spindle (10); S43: The metal mold is pulled as a whole toward a direction away from the second-layer reinforcement step (1) by the demoulding machine (14). At this time, the demoulding machine baffle (15) blocks the product, and demoulding is completed; S44: Knock the embedded guide rail (4) out of the milling cutter groove (3) using the demoulding nails.

10. The method for forming a composite material launch tube according to claim 9, characterized in that: In S5, the excess on both end faces of the product after demoulding in S4 is first cut off, and then a plurality of T-slots (18) are machined on the end face step (6), and a plurality of bolt through holes matching the T-slots (18) are machined on the side end faces of the end face step (6) and the tail flange (5).

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