Forming method of composite material launch canister

Abstract

The invention relates to the technical field of launch canister forming, in particular to a forming method of a composite launch canister, which comprises the following steps: S1, primary winding of glass fiber yarns by a wet method; glass fiber yarn is adopted to wind the launch canister body part in a wet winding mode, two layers of reinforcing step parts are wound on the tail reinforcing area of the launch canister body, and a primary preformed body of the launch canister body is formed; s2, milling cutter groove operation of the guide rail is carried out; s3, a tail flange, an end face step, a head flange and a middle hoop are formed through cloth wet-method secondary winding, and therefore a secondary preformed body of the launch canister body is formed; and S4, demolding operation is carried out, and a finished launch canister product is obtained after demolding. And S5, a mounting groove is machined in the machining end face of the finished launch canister, and drilling operation is conducted. The forming efficiency of the launch canister can be improved, the forming difficulty can be reduced, the machining problem of a long and thin inner diameter deep and long guide rail can be solved, the later machining workload is reduced, the fiber strength of a product can be guaranteed, and the bearing strength and the inner pressure bearing capacity of a canister body can be enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of launch tube molding, and specifically provides a molding method for a composite material launch tube. Background Art

[0002] As an important component of the missile body, the launch tube is a special cylindrical device for storing, transporting and launching missiles. At present, the application of launch tubes at home and abroad is gradually increasing. Composite launch tubes have been widely used due to their excellent performance of light weight and high strength. In the prior art, the following patents involve the production and molding of composite launch tubes: 1. The invention patent with the patent number of "202010824801.5" and the patent name of "A method for forming a composite concentric launch tube" includes the following steps: mold preparation; raw material preparation; inner tube ablation layer paving: lay the glass fiber-phenolic resin prepreg strip in a tensioned circumferential direction on the mold, then put it in a vacuum bag for compaction, and enter the autoclave for pre-curing and molding. After curing and cooling, clean the outer surface of the inner tube ablation layer; lay the inner tube structural layer; bond the longitudinal reinforcement; lay the longitudinal reinforcement wrapping structural layer and the longitudinal reinforcement fireproof ablation layer; lay the outer tube protective layer and the outer tube structural layer; add annular reinforcement; clean the surface of the obtained inner tube and the obtained outer tube and then assemble them to obtain a composite concentric launch tube. The launch tube produced in the present invention has a light structure and high strength, but this patent only uses glass fiber and epoxy resin winding molding, and there is no need to enter the autoclave, so the strength of the obtained launch tube is limited.

[0003] 2. The invention patent application with the patent number "202211717091.1" and the patent name "A composite launch tube for cold launch and its preparation method" uses a wet winding process to embed the metal parts at both ends. The position of the metal parts is guaranteed by the mandrel of the mandrel mold and the positioning tooling; the carbon fiber structure layer and the glass fiber layer are both wound; and the anti-static layer and sealing layer are designed. This solution can improve the connection strength between the metal parts and the composite tube, but the processing procedures are complicated, the operation is difficult, the molding method is low, and the workload of later machining is large.

[0004] 3. The invention patent application with the patent number "202211356266.0" and the patent name "A launch tube with a guide rail and a molding process" includes a resin-based composite launch 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. The composite guide rail is bonded to the inner wall of the resin-based composite launch tube through the second resin-based composite material layer. The invention also provides a molding process for the above-mentioned launch tube with a guide rail. This invention solves the connection problem between the wear-resistant guide rail and the resin-based composite launch tube. The product has good integrity and is easy to ensure the pressure resistance of the launch tube. However, the production steps of this solution are cumbersome, the strength is limited, and the guide rail groove is difficult to process.

[0005] As can be seen from the above, the prior art can improve the performance of the product to a certain extent by designing and manufacturing the launch tube, but there are still problems such as complex process, insufficient fiber strength, difficult guide groove processing, and huge amount of post-processing. Therefore, how to design a molding method for a composite launch tube with high production efficiency, fewer processing steps, reliable product strength, and low processing difficulty is an urgent problem to be solved. Summary of the invention

[0006] In order to solve the above problems, the present invention provides a molding method for a composite material launch tube, which can improve the bearing strength, improve the processing efficiency, and solve the problems of difficulty in processing special-shaped guide rails and large amount of subsequent machining workload.

[0007] The present invention provides a method for forming a composite material launch tube, which specifically comprises the following steps: S1: Glass fiber yarn wet winding once; S11: The main body of the launch tube is wound with glass fiber yarn by wet winding; S12: Continue wet winding at the tail reinforcement area of ​​the launch tube body to form a second-layer reinforcement step portion of the launch tube, thereby forming a primary preform of the launch tube body; S13: curing and forming the primary preform of the launch tube body; S2: Perform the milling cutter groove operation of the guide rail; S21: Processing the milling cutter groove for placing the guide rail on the second-floor reinforcement step; S22: pre-embed the guide rail in the milling cutter slot; S3: Secondary winding with wet cloth; S31: Wrapping plain cloth on the second-layer reinforcement step to form a cloth-wrapped tail flange; S32: wrapping the end face step near the outer end of the tail flange, wrapping the head flange at the end away from the end face step on the primary preform of the launch tube body, and wrapping the middle hoop between the end face step and the head flange on the primary preform of the launch tube body; thereby forming a secondary preform of the launch tube body; S33: curing and forming the secondary preform of the launch tube body; S4: Demolding operation is performed to obtain a finished launch tube after demolding; S5: Process the mounting groove and perform drilling operations on the machined end face of the finished launch tube.

[0008] Furthermore, in S11, the main body of the launch tube is wound on the metal mold, which specifically includes the following sub-steps: S111: installing a front end head and a rear end head on the front end spindle and the rear end spindle of the metal mold body respectively; S112: The front spindle and the rear spindle are clamped by a long winding machine; S113: Starting from the end of one end of the main shaft, cross-loop winding is performed toward the other end of the main shaft. Both the front end seal and the rear end seal need to be wound with glass fiber yarn, and the adjacent circles of glass fiber yarn wound are wound back at the front end seal or the rear end seal to be continuously wound.

[0009] Furthermore, in S12, the height of the second layer of reinforcing steps is wound according to the height of the guide rail; during curing in S13, the primary preform of the launch tube body is brought into a curing furnace with a mold for heating and curing to form an integral body.

[0010] Furthermore, the method for processing the milling cutter groove on the second-layer reinforcement step in S21 is: first use a side milling cutter to mill off more than two slender fiber blocks as needed, and at the same time form a slender inner diameter milling cutter groove with an arc on the second-layer reinforcement step; the guide rail in S22 is a curved structure matched with the milling cutter groove.

[0011] Furthermore, in S22, before the guide rail is embedded, the guide rail needs to be wrapped with anti-adhesion material and then embedded in the milling cutter groove; after the guide rail is embedded, demoulding pins are installed on the outer end surface of the guide rail, and the demoulding pins are located on the inner side of the outer surface of the second-layer reinforced step.

[0012] Further, the cloth wrapping the tail flange in S31 includes the following steps: S311: placing the primary preform of the launch tube body with the guide rail embedded therein on a long winding machine, and clamping the front spindle and the rear spindle by the long winding machine; S312: Install an annular fixing piece at the embedded guide rail on the second-floor reinforced step to assist in limiting the guide rail; S313: Brush glue and slowly wrap the plain cloth at the second-layer reinforcement step. After the embedded guide rail is completely fixed by the plain cloth, remove the annular fixings; after the plain cloth soaked in resin and with tension is covered with the embedded guide rail and wrapped around the second-layer reinforcement step once, turn on the fast winding mode and quickly wrap the plain cloth until the tail flange is wrapped to the required thickness.

[0013] Furthermore, the winding steps of the end face step, the head flange, and the middle hoop in S313 are as follows: S3131: Cut the plain fabric into the required widths for the end steps, head flanges and middle hoop; S3132: Place the winding machines at the corresponding positions and start the winding operation.

[0014] Furthermore, the thickness of the end face step and the middle ring 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 ring hoop.

[0015] Further, the demoulding step in S4 is as follows: S41: cutting off the front end head and the rear end head; S42: a stripper baffle is provided at the outer end surface of the head flange, and a stripper traction device is used to clamp the front spindle; S43: The metal mold is pulled as a whole 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, and demoulding is completed; S44: Knock the embedded guide rail out of the milling cutter groove using demoulding pins.

[0016] Furthermore, in S5, the excess on the two 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 end face steps and the side end faces of the tail flange.

[0017] Compared with the prior art, the present invention can achieve the following beneficial effects: The present invention completes the first layer of winding by wet winding of glass fiber resin, and the tail area is reinforced by secondary plain cloth winding, which can quickly complete the winding of the tail reinforcement flange and the end face step. The secondary cloth winding axial fiber is combined with the primary winding yarn to greatly improve the processability of the end face. The side drilling large holes to install T-bolts can bear large axial tensile forces. The cylinder has high load-bearing strength and strong internal pressure bearing capacity.

[0018] The present invention pre-buries the guide rail by winding two layers of reinforcing steps and then opening a milling cutter groove on the second layer 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.

[0019] The present invention sets a front end cap and a rear end cap when performing the wet primary winding of the glass fiber yarn. The yarn can be turned back at the front end cap and the rear end cap during cross winding, which can ensure the continuity of the yarn winding, realize cross winding, variable diameter winding, and variable angle winding, and ensure the strength of the fiber. At the same time, the present invention processes the tail flange and the end face step in the tail reinforcement area, further ensuring the thickness and bearing capacity of the tail reinforcement area, while ensuring the overall high winding strength, improving the work efficiency of the local thickening of the winding, and the narrow plain cloth secondary winding step is thickened uniformly without excessive redundancy, which greatly reduces the workload of the later machining and grinding of the composite barrel size. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a primary preform of a launch tube body provided according to an embodiment of the present invention; Figure 2 is a schematic diagram of a slot milling structure of a milling machine provided according to an embodiment of the present invention; Figure 3 is a schematic diagram of a pre-buried guide rail installation structure provided according to an embodiment of the present invention; Figure 4 2 is a schematic diagram of a secondary cloth wet winding structure provided according to an embodiment of the present invention; Figure 5 is a schematic diagram of a product demoulding process provided according to an embodiment of the present invention; Figure 6 is a schematic structural diagram of a product after demoulding according to an embodiment of the present invention; Figure 7 It is a schematic diagram of machining the end face T-slot, drilling and finished product of the tail flange of the product provided according to an embodiment of the present invention; Figure 8 1 is a schematic diagram of yarn winding when glass fiber yarn is wound once by a wet method according to an embodiment of the present invention.

[0021] The reference numerals therein include: two-layer reinforcement step 1, primary preform of the launch tube body 2, milling cutter groove 3, guide rail 4, tail flange 5, end face step 6, head flange 7, intermediate hoop 8, secondary preform of the launch tube body 9, front end spindle 10, rear end spindle 11, front end head 12, rear end head 13, demoulding machine 14, demoulding machine baffle 15, main glass fiber yarn 16, metal mold body 17, T-slot 18, hexagon socket bolt 19. DETAILED DESCRIPTION

[0022] In the following, reference will be made to the Figure 1-8 Embodiments of the present invention are described. 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, the detailed description thereof will not be repeated.

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the following Figure 1-8 It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation of the present invention.

[0024] A method for forming a composite material launch tube comprises the following steps: S1: Glass fiber yarn wet winding once.

[0025] S11: Use glass fiber yarn to wind the main body of the launch tube by wet winding, and the main body of the launch tube is the main glass fiber yarn 16 shown in the figure. Specifically, it includes the following sub-steps: 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.

[0026] 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.

[0027] S113: Starting from the end of one main shaft, cross winding is performed toward 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 wound adjacent circles 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, the yarn is wound in the direction of S1. When reaching the front end seal 12, the yarn is also wound on the front end seal 12, and then wound back in the direction of S2 at point B2. The yarn winding diagram in the figure is only for illustration. In actual operation, it is necessary to continue winding from point B3 to the rear end seal 13, and then wind back after winding on the rear end seal 13, and then repeat the cross-loop winding until the required thickness is reached. In this embodiment, after the production is completed, the thickness d1 of the launch tube body is 8-11mm.

[0028] S12: Continue wet winding in the tail reinforcement area of ​​the launch tube body to form the second-layer reinforcement step 1 of the launch tube, that is, wind the glass fiber yarn on one side of the main glass fiber yarn 16 located in the tail reinforcement area. The wound glass fiber yarn is the second-layer reinforcement step 1. The second-layer reinforcement step 1 and the main glass fiber yarn 16 together form a primary preform 2 of the launch tube body. After processing the second-layer reinforcement step 1, the thickness d2 of the glass fiber yarn at the tail reinforcement area is 20.5 mm.

[0029] S13: The primary preform 2 of the launch tube body is cured and formed, and the height of the second-layer reinforcing step 1 is wrapped according to the height of the guide rail 4. During curing, the primary preform 2 of the launch tube body is brought into a curing furnace with a mold for heating and curing to form an integrated body.

[0030] S2: Perform the milling cutter groove 3 operation of the guide rail 4, and the height of the guide rail 4 is 20 mm.

[0031] S21: machining a milling cutter groove 3 for placing the guide rail 4 on the second-layer reinforcement step 1. The method for machining the milling cutter groove 3 on the second-layer reinforcement step 1 is: firstly, 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, and the guide rail 4 is a structure with an arc matched with the milling cutter groove 3, and the size of the milling cutter groove 3 is 800 mm (length) * 80 mm (width) * 20 mm (height).

[0032] S22: Pre-embed the guide rail 4 in the milling cutter groove 3. The guide rail 4 is made of aluminum alloy or plastic. Before the guide rail 4 is pre-embedded, it is necessary to wrap the guide rail 4 with anti-adhesion material, and then pre-embed the guide rail 4 into the milling cutter groove 3. In this embodiment, Teflon is used to wrap the guide rail 4, and the guide rail 4 is fit into the milling cutter groove 3. Teflon can prevent the guide rail 4 from adhering to the milling cutter groove 3, which is convenient for demoulding. After the guide rail 4 is pre-embedded, demoulding pins are installed on the outer end face of the guide rail 4. The demoulding pins are located on the inner side of the outer surface of the second-layer reinforcement step 1 as a whole to avoid interference. The demoulding pins are used for demoulding the guide rail 4 in the subsequent process. Directly applying force to the demoulding pins to remove the guide rail 4 can avoid damage to the product and the guide rail 4 caused by applying force to the guide rail 4. The demoulding pins are not shown in the figure.

[0033] In this embodiment, two guide rails 4 and two milling cutter grooves 3 are set. Technical personnel in this field can also make other numbers of guide rails 4 and milling cutter grooves 3 according to actual conditions, and can also set guide rails 4 and milling cutter grooves 3 at other positions. For example, multiple milling cutter grooves 3 can be set in the circumferential direction, which can be divided into 3 groups or 4 groups of embedded guide rails 4.

[0034] S3: Secondary winding with wet cloth.

[0035] S31: Wrapping a wide plain cloth on the second-layer reinforcement step 1 to form a cloth-wrapped tail flange 5. The cloth-wrapped tail flange 5 includes the following steps: S311: Place the primary preform 2 of the launch tube body with the guide rail 4 embedded therein 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.

[0036] S312: An annular fixing member is installed at the embedded guide rail 4 on the second-floor reinforced step 1 to assist in limiting the guide rail 4. The annular fixing member can be an annular tie or a tooling fixture to prevent the guide rail 4 from falling off.

[0037] S313: Brush glue and slowly wind the plain cloth at the second-layer reinforcement step 1. After the embedded guide rail 4 is completely fixed by the plain cloth, remove the annular fixings, cut off the annular tie, or remove the fixture. After the resin-soaked and tensioned plain cloth covers the embedded guide rail 4 and is wrapped around the second-layer reinforcement step 1, turn on the fast winding mode to quickly wind the plain cloth until the tail flange 5 is wound to the required thickness. When the plain cloth is wound, a variable angle winding method is adopted. After the tail flange 5 is wound, the overall thickness d3 of the glass fiber yarn and the plain cloth at the tail reinforcement area is 35.5mm.

[0038] The winding steps of the end face step 6, the head flange 7 and the intermediate hoop 8 are as follows: S3131: Cut the plain cloth into the required widths of the end step 6, the head flange 7, and the middle hoop 8.

[0039] S3132: Place the wrapping machines at the corresponding positions and start the wrapping operation. The thickness of the end face step 6 and the middle hoop 8 is determined by the size of the product's external interface. According to the characteristics of the mold demolding, the metal mold in the head flange 7 area has a certain taper, the head demolding port has a large inner diameter, and the tail area has a small inner diameter. The head demolding position needs to be wrapped thicker for the next step of demolding. The thickness of the head flange 7 is greater than the thickness of the middle hoop 8.

[0040] S32: Wrap the end face step 6 near the outer end of the tail flange 5, wrap the head flange 7 at the end away from the end face step 6 on the primary preform 2 of the launch tube body, and wrap the middle hoop 8 between the end face step 6 and the head flange 7 on the primary preform 2 of the launch tube body, so as to form the secondary preform 9 of the launch tube body. After the end face step 6 is wrapped, the overall thickness d4 of the glass fiber yarn and plain weave cloth at the tail reinforcement area is 50mm, and after the head flange 7 is wrapped, the overall thickness d5 of the glass fiber yarn and plain weave cloth at the head flange 7 is 35mm.

[0041] S33: The secondary preform 9 of the launch tube body is cured and formed, and the secondary preform 9 of the launch tube body is brought into a curing furnace with a mold for heating and secondary curing.

[0042] S4: Demolding operation is performed to obtain the finished launch tube. The demoulding steps are as follows: S41: cutting off the front end cover 12 and the rear end cover 13, and grinding the cut end surfaces.

[0043] S42: a stripper baffle 15 is arranged at the outer end surface of the head flange 7, and a stripper 14 traction device is used to clamp the front spindle 10.

[0044] S43: Figure 5 As shown, the metal mold is pulled by the demoulding machine 14 to move in the direction indicated by F 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.

[0045] S44: knock the embedded guide rail 4 out of the milling cutter groove 3 by means of demoulding nails.

[0046] S5: Figure 7 As shown, the installation grooves are processed and drilling operations are performed on the machined end faces of the finished launch tube. First, the excess on the two end faces of the product after demoulding in S4 is 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 processed on the side end faces of the end face step 6 and the tail flange 5, and the hexagon socket bolts 19 are installed in the bolt through holes. In this embodiment, 24 T-slots and 24 bolt through holes are machined.

[0047] The tail of a large composite launch tube is usually connected to a power unit, and the tail area needs to withstand greater impact 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, a secondary cloth winding process is adopted in the tail area. 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 gives full play to the axial and circumferential fiber strength of the fiber, has high machining accuracy, and excellent axial (lateral) load-bearing performance.

[0048] The internal structure design of the launch tube is usually based on the body structure design. Multiple long guide rail grooves need to be arranged at the tail. The diameter of the launch tube is 300-350mm, which is difficult to machine. Ordinary boring cutters and milling cutters cannot be processed. It is difficult to complete the processing of the internal groove with a depth of more than 600mm with a customized special extended boring cutter. In this embodiment, the first layer of yarn is wet-wound, and the milling cutter groove 3 is milled out with a mold after curing. The length of the milling cutter groove 3 is not limited, which can meet the needs of the guide rail 4, avoiding the problem of the difficulty of machining the slender inner diameter medium-depth long guide rail 4 or the long guide rail 4. Then, the prefabricated guide rail (600-1000mm long) wrapped with Teflon with clearance fit is laid, and it can be wound twice on a large winding machine, and the fiber continuity, tension and angle can be guaranteed.

[0049] 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. The wet yarn is prone to slippage during circumferential winding, and winding is slow to reach the specified thickness. 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, according to different step widths, standard wide cloth is cut to make narrow plain cloth of a specific width, and the narrow plain cloth is used for secondary synchronous rapid wet winding. The winding machine applies tension, and the adjacent intermediate hoops 8, the tail flange 5, and the head flange 7 can be wound synchronously. The thickened end face steps of the tail flange 5 and the head flange 7 can be wound quickly, which can improve the processing efficiency and reduce the workload of the later machining and grinding of the external dimensions of the composite barrel.

[0050] The finished composite material launch tube is a tube with high strength and rigidity, such as Figure 7The finished cylinder shown can withstand an internal pressure of ≥4Mpa and 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 grooves 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 the depth from the end face of the tail flange 5 exceeds 800mm. The milling cutter groove 3 is 80mm wide and 20mm high, and can withstand impact loads.

[0051] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0052] The above specific implementations of the present invention do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

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: The main body of the launch tube is wound with glass fiber yarn by wet winding; S12: continuing to wet-wind in the tail reinforcement area of ​​the launch tube body to form a second-layer reinforcement step (1) portion of the launch tube, thereby forming a primary preform (2) of the launch tube body; S13: curing the primary preform (2) of the launch tube body; S2: Performing a milling cutter groove (3) operation on the guide rail (4); S21: machining a milling cutter groove (3) for placing a guide rail (4) on the second-layer reinforcement step (1); S22: embedding a guide rail (4) in the milling cutter groove (3); S3: Secondary winding with wet cloth; S31: Wrapping a plain cloth on the second reinforcing 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 an 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 a finished launch tube after demolding; 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 main body of the launch tube 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 of the main shaft as the starting point, cross-loop winding is performed toward the other end of the main shaft, and the front end end (12) and the rear end end (13) are both required to be wound with glass fiber yarn, and the wound adjacent turns of glass fiber yarn are wound back at the front end end (12) or the rear end end (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 two-layer reinforcing step (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 integrated 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: first, use a side milling cutter to mill off two or more slender fiber blocks as required, and at the same time form a slender inner diameter milling cutter groove (3) with an arc 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: In S31, the cloth wrapping of the tail flange (5) comprises 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 spindle (10) and the rear end spindle (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 wind the plain cloth at 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 is wound around the second-layer reinforcement step (1) once, turn on 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), the head flange (7) and the middle hoop (8) of S313 are as follows: S3131: cutting the plain fabric into the required widths of the end face step (6), the head flange (7), and the middle hoop (8), that is, cutting 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 external interface of the product; 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 cover (12) and the rear end cover (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 by the demoulding machine (14) to move in a direction away from the second reinforcing step (1). At this time, the demoulding machine baffle (15) blocks the product, and demoulding is completed; S44: The embedded guide rail (4) is knocked out from the milling cutter groove (3) by using the demoulding pins.

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

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