One-time forming method for array type small-diameter common-flange carbon fiber launching canister

Abstract

The invention discloses a one-time forming method for an array type small-diameter common-flange carbon fiber launching canister. The one-time forming method comprises the steps that the structure of the launching canister is designed; designing a forming mold and a tool; the array type small-diameter common-flange carbon fiber launch canister is designed in a parting and layering mode; and forming the array type small-diameter common-flange carbon fiber launching tube. Wedge-shaped pins are used for cooperation at multiple positions, so that pressure transmission is uniform in the forming process of a complex structural part; compared with other preparation processes, non-machining, non-bonding, non-sealing and direct one-time forming of the launching barrel is achieved; and the flange plate and the cylinder body are connected and fastened through occlusion lamination by using the trapezoidal opening prepreg cloth at the flange, so that the structural integration is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of preparation of light conventional equipment system launch device components, and relates to a one-time molding method of an array-type small-diameter common flange carbon fiber launch tube. Background Art

[0002] Modern warfare requires lightweight conventional equipment systems to have high mobility, high rate of fire, and high power. The metal used in general material design is relatively heavy, and the equipment system has limited space and load. In order to ensure the flexibility of the equipment, reduce the overall weight of the equipment, and improve the load and system performance indicators, lightweight requirements are put forward for the launch system to achieve strategic goals. The launch system is a device that enables the product to reach the target and achieve strikes. It is generally composed of components such as the launch tube, end cover, firing mechanism, and sight.

[0003] The launch tube is part of the launch system. During the launch, the product is guided to fly out of the launch tube by the barrel rifling, and the posture is controlled by the barrel rifling. During the launch process, the product is subjected to instantaneous strong impact loads and high temperature and high pressure, which causes the equipment system to produce extremely complex vibrations and thermal radiation. The matrix interface of carbon fiber composite materials has a strong vibration absorption effect. Compared with black metals, it has better comprehensive properties such as strength, rigidity and toughness. In addition, it is resistant to high temperature, ablation, has high specific strength and large specific modulus, making it the preferred material for the launch tube. The existing launch tube is a combined molding, that is, multiple launch tubes and connecting plates are molded separately first, threaded holes or rivet holes are added to the connecting plates, and the launch tube structural parts are assembled and combined by screwing or riveting and gluing. The preparation process is cumbersome, and the coordination relationship of the positioning of the inner rifling during assembly is complex. Factors such as stress concentration at the screw holes or rivet holes seriously affect the stability and sealing of the product. Summary of the invention

[0004] (I) Purpose of the invention

[0005] The purpose of the present invention is to provide a one-time molding method for an array-type small-diameter common flange carbon fiber launch tube, which utilizes the designability of carbon fiber composite materials, the flexibility of mold design, the convenience of molding methods, etc., to avoid the complicated process of punching and gluing after the single tube is formed, improve production efficiency and product integrity, and at the same time meet the multiple launch requirements of light conventional equipment launch systems.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the present invention provides a one-time molding method of an array-type small-diameter common flange carbon fiber launching tube, comprising the following steps:

[0008] (1) Design the structure of the launch tube: Design an array-type small-diameter common flange carbon fiber launch tube, perform finite element analysis on the array-type small-diameter common flange carbon fiber launch tube, and obtain a geometric model of the array-type small-diameter common flange carbon fiber launch tube; the designed array-type small-diameter common flange carbon fiber launch tube has a mounting hole in the center and multiple launch tube bodies evenly distributed around the circumference.

[0009] (2) Design of molding mold and tooling: A molding mold is designed based on the structural characteristics of the array-type small-diameter common-flange carbon fiber launch tube. The mold is divided into a core mold, a mold sleeve, an inner mold, an outer mold, and a flange molding metal plate. A demolding tooling is designed to obtain a molding mold for an array-type small-diameter common-flange carbon fiber launch tube.

[0010] (3) Design of the layup of the array-type small-diameter common-flange carbon fiber launch tube: The carbon fiber / epoxy prepreg is impregnated by the hot-melt method, and the quasi-isotropic design of the layup of the array-type small-diameter common-flange carbon fiber launch tube is carried out. The prepreg is cut to obtain the prepreg used for the molding of the array-type small-diameter common-flange carbon fiber launch tube.

[0011] (4) Forming of an array-type small-diameter common flange carbon fiber launch tube: the core mold is formed by laying prepreg cloth, the inner mold and the mold sleeve are covered with prepreg cloth, vacuum pre-pressed, and the molding mold is combined. The array-type small-diameter common flange carbon fiber launch tube is formed and cured, demolded, and post-processed to obtain an array-type small-diameter common flange carbon fiber launch tube.

[0012] Furthermore, in step (1), the array-type small-diameter common-flange carbon fiber launch tube designed by screwing and gluing is surveyed and designed in terms of single-tube diameter, length, wall thickness, rifling pattern, flange connection dimensions, etc.

[0013] Further preferably, screws, sealants and connecting devices are removed during the design process, and carbon fiber composite materials are used to supplement the missing parts at these locations.

[0014] Further preferably, the carbon fiber composite material is an intermediate prepreg cloth pre-impregnated with a reinforcement carbon fiber fabric (twill, satin, plain) and a resin matrix (epoxy resin, phenolic resin, bismaleimide resin, etc.), and the prepreg cloth used in the patent of the present invention is a twill carbon fiber / epoxy prepreg cloth (hereinafter "prepreg cloth" can be used instead of "carbon fiber / epoxy prepreg cloth").

[0015] Furthermore, step (1) performs finite element analysis on the array-type small-diameter common-flange carbon fiber launch tube, uses computer software (the software used in the patent of this invention is ABAQUS, and other software can also be analyzed, such as UG, CATIA, CREO, etc.) to perform force analysis on the geometric model of the array-type small-diameter common-flange carbon fiber launch tube, optimizes the launch tube structure according to the design results, and obtains the geometric model of the array-type small-diameter common-flange carbon fiber launch tube.

[0016] Furthermore, in step (2), a molding mold is designed according to the external structural characteristics of the array-type small-diameter common flange carbon fiber launch tube, and the mold is divided into a core mold, a mold sleeve, an inner mold, an outer mold, and a flange molding metal disk.

[0017] Further preferably, there are six evenly distributed metal hollow cylinders inside the core mold, and a demolding taper is designed along the length direction of the non-flange disk, and the taper is designed to be 1 / 1000 of the overall length of the launch tube. The six metal hollow cylinders are detachable, and the outer surface of the metal hollow cylinders has protruding rifling. The launch tube is fixed and combined by a circular chassis during molding. After the six metal hollow cylinders are assembled, the six metal hollow cylinders are fixed separately on one side of the core mold by the locating pins of the circular chassis, and the other side of the core mold is fixed with a plum blossom disk combination with a long axis, which is convenient for laying prepreg cloth.

[0018] Further preferably, the mold sleeve is divided into two parts, the left and right parts, the interiors of the left and right mold sleeves are designed according to the outer surface of the launch tube, and the exteriors of the left and right mold sleeves are designed as wedge-shaped styles of cylindrical segments, so as to facilitate uniform application of pressure through the outer mold mating surface segments when closing the molds. The mating surfaces of the two parts of the left and right mold sleeves are chamfered, and four locating pins are left in the left and right mold sleeves. Wedge grooves and glue flow grooves of flange-formed metal inner disks are left at the inner and outer molds of the left and right mold sleeves, and guide grooves are left at the closing molds of the left and right mold sleeves.

[0019] Further preferably, the inner mold is a three-petal combination mold, which is shaped like a plum blossom after combination. The outer surface of the inner mold after combination follows the inner surface of the launch tube. After the inner mold is combined, the inner ring pressure device is wedge-shaped. After the wedge-shaped pin is inserted, it is convenient for the left and right mold sleeves to apply pressure during molding.

[0020] Further preferably, the outer mold is designed as an upper and lower mold, fixed on a press (threaded holes can also be opened on the outer mold, and a screw is used to apply pressure. The present invention adopts a press to apply pressure). A circle of annular electric heating holes is designed on the outer mold, and a thermocouple hole is provided, so that a uniform temperature field is formed when the launch tube is formed, and the inner surfaces of the upper and lower outer molds follow the outer surface of the mold sleeve.

[0021] Further preferably, the flange-shaped metal inner plate is a wedge-shaped hexagonal upper and lower plate, which is convenient for pressurization.

[0022] Furthermore, the demoulding tooling in step (2) uses a drawing machine of a hydraulic mechanical device for demoulding, and the demoulding tooling is used to pull the core mold while ejecting the launch cylinder, with a guide rail in the middle, and a corresponding gear rack is provided on the guide rail, and a servo motor is provided on the gear rack.

[0023] Furthermore, in step (3), the carbon fiber / epoxy prepreg is impregnated by hot melt method, the epoxy resin is heated and melted, and the thickness of the adhesive film is calculated according to the surface density and resin content of the prepreg (the epoxy resin content of the prepreg used in the present invention is 40±3%). After the adhesive film is made, it is impregnated with the carbon fiber fabric, and an isolation film is attached and rolled up to obtain the carbon fiber / epoxy prepreg.

[0024] Furthermore, in step (3), the array-type small-diameter common flange carbon fiber launch tube ply is subjected to quasi-isotropic design and parting, the carbon fiber / epoxy prepreg is parted according to [(0° / 90°)(45° / -45°)], the flange is designed by opening a trapezoidal opening and alternatingly laying annular prepregs, the parted prepregs are designed by circumferential butt jointing when being laid on a single barrel, the length of the prepregs after parting is controlled so that the butt joints of the prepregs are evenly distributed on the barrel, thereby ensuring uniform mechanical strength and thickness of the launch tube after molding.

[0025] Further preferably, the carbon fiber / epoxy prepreg is divided into [(0° / 90°)(45° / -45°)], which is distinguished in a way that the radial fiber bundle parallel to the prepreg is 0° and the angle rotating counterclockwise is positive.

[0026] Furthermore, in step (3), the prepreg is cut according to the designed pattern using an automatic cloth cutting machine, and the cut prepreg is numbered.

[0027] Furthermore, in step (4), the core mold prepreg is laid and formed. After the core mold is assembled, it is placed on a support frame and laid separately according to the parting of the prepreg. When every six metal hollow cylinders are laid, a layer of prepreg with a trapezoidal opening is laid on the flange forming circular chassis, so that the trapezoidal opening prepreg at the flange and the prepreg on the metal hollow cylinder are cross-distributed. According to the thickness of the flange, the annular cloth is inserted in batches during the laying process, and the metal cylinder rifling is compacted according to the shape during the laying process.

[0028] Furthermore, in step (4), the inner mold and mold sleeve are covered with prepreg cloth, and two layers of prepreg cloth are laid on the inner mold and the mold sleeve, and a scraper is used to smooth the inner mold and the mold sleeve. Before laying, the inner mold and the mold sleeve can also be heated to 40°C to 50°C to facilitate laying.

[0029] Furthermore, the vacuum pre-pressing in step (4) requires vacuum pre-pressing every time two layers of prepreg are laid, and vacuum compaction is also required after the inner mold and mold sleeve are laid.

[0030] Further preferably, after vacuuming, a porous membrane and a breathable felt are sequentially laid on the surface of the product after making a vacuum bag, and the whole is placed in the bag and sealed with a sealant.

[0031] More preferably, the vacuuming should ensure that the pressure in the vacuum bag is below -0.085 MPa, and the vacuuming time is more than 15 minutes.

[0032] Furthermore, in the combined molding mold described in step (4), the plum blossom disk with the long axis is removed, the core mold is placed in the mold sleeve, and the three-petal inner mold is sequentially placed in the gaps between the six launch tubes of the core mold after the prepreg is laid, and a wedge pin is inserted into the center of the three-petal inner mold; the flange-molded metal inner disk is assembled and placed in the left mold sleeve as a whole, the right mold sleeve is closed according to the positioning pin, and the lower outer mold is placed on the press, and the electric heating tube and the thermocouple are inserted according to the reserved electric heating holes, and the mold is closed.

[0033] Furthermore, in step (4), the array-type small-diameter common flange carbon fiber launch tube is formed and cured, and the curing temperature is controlled by a temperature control cabinet next to the press. The specific parameters are: heating to 85°C in 50min-70min, keeping warm at 85°C for 40min, raising the temperature from 85°C to 100°C in 15min, applying contact pressure (2MPa-3MPa), keeping warm at 100°C for 30min, and then heating from 100°C to 125°C-130°C in 25min, during which the contact pressure is increased to (5MPa-6MPa) and (7MPa-8MPa) twice, and then keeping warm and pressurizing at 125°C-130°C for 90min. After the pressurization is completed, the mold gap is ≤0.2mm, and then the power is turned off and naturally cooled.

[0034] Furthermore, in step (4), the demoulding is performed by naturally cooling the mold to below 60°C, demoulding, removing the mold sleeve and the flange-molded inner disk, placing the core mold as a whole on the demoulding tooling, and demoulding using a hydraulic mechanical drawing machine. The tube stripping machine runs slowly and evenly to separate the metal hollow tube and the launch tube products.

[0035] Furthermore, in the post-processing of step (4), the edges of the launch tube after demoulding are polished and the joints are cleaned to obtain an array-type small-diameter common flange carbon fiber launch tube.

[0036] (III) Beneficial effects

[0037] The one-time molding method of the array-type small-diameter common-flange carbon fiber launch tube provided by the above technical solution innovatively uses wedge pins in multiple places to ensure uniform pressure transmission during the molding process of complex structural parts; compared with other preparation processes, the launch tube body is non-machined, non-bonded, and non-sealed, and can be directly molded in one time; the use of trapezoidal mouth prepreg cloth at the flange allows the flange and the tube body to be fastened through interlocking lamination to achieve structural integration; the use of carbon fiber / epoxy composite materials instead of the original screws and colloids eliminates the influence of the interfaces of different materials in the composite materials on the bonding strength of the product; the non-autoclave molding method is adopted to save the molding cost of the launch tube, which is in line with the production concept of reducing costs and increasing efficiency; through the cooperation of the combined mold, the molding method is reliable, highly repeatable, and the process coordination relationship is reasonable; the curing characteristics of epoxy resin are fully utilized, the gradient molding temperature level is set, and the excellent process characteristics of the prepreg cloth are utilized, so that the mechanical properties and thermal properties of the parts are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of the array-type small-diameter common-flange carbon fiber launch tube structure.

[0039] Figure 2 Schematic diagram of the core mold structure; a is the core mold structure, b is the schematic diagram of the plum blossom disk structure, and c is the metal hollow cylinder.

[0040] Figure 3 Schematic diagram of a single mold sleeve structure.

[0041] Figure 4 Schematic diagram of the inner mold structure.

[0042] Figure 5 Schematic diagram of the outer mold section and flange-formed metal inner disk section structure.

[0043] Figure 6 Schematic diagram of the trapezoidal prepreg at the flange. DETAILED DESCRIPTION

[0044] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples.

[0045] The one-step molding method of the array-type small-diameter common flange carbon fiber launch tube in this embodiment includes the following steps:

[0046] (1) Design of the launch tube structure

[0047] The surveying and design is carried out based on the single barrel diameter, length, wall thickness, rifling style and flange connection dimensions of the launch tube combined with screw connection and glue connection. The screws, sealants and connection devices are removed in the software, and the strength design of carbon fiber composite materials is used to compensate for the position here. Figure 1As shown, the array-type small-diameter common flange carbon fiber launch tube 1 is draped and formed using twill carbon fiber / epoxy prepreg. Finite element analysis is performed on the array-type small-diameter common flange carbon fiber launch tube 1, and the geometric model is subjected to force analysis on the use conditions of the array-type small-diameter common flange carbon fiber launch tube 1 using computer software (the software used in the present invention is ABAQUS, and other software can also be analyzed, such as UG, CATIA, CREO, etc.), and the launch tube structure is optimized according to the deformation and stability results of the product to obtain the final geometric model of the array-type small-diameter common flange carbon fiber launch tube 1. Finite element analysis first discretizes and meshes the launch tube 1 model, uses carbon fiber / epoxy prepreg to prepare mechanical specimens, tests tensile strength, bending strength, impact shear strength and other mechanical properties, inputs the mechanical properties parameters of the tested carbon fiber composite material, sets the boundary condition simulation and load simulation according to the use conditions of the launch tube, and analyzes the connection thickness of the flange 2 of the array-type small-diameter common flange carbon fiber launch tube and the wall thickness of the launch tube to check whether the calculation results meet the design requirements and use requirements. According to the corresponding stress lines and deformation amounts of each part of the tube body of the launch tube geometric model, the weak parts of the launch tube design are thickened until the structure of the launch tube meets the requirements.

[0048] (2) Molding mold and tooling design

[0049] According to Figure 1 The array type small diameter common flange carbon fiber launch tube 1 shown in the figure has the following appearance and structural features: the design of the molding mold, the mold is divided into: Figure 2 The core mold shown, such as Figure 3 The mold set shown, such as Figure 4 The inner mold shown, such as Figure 5 The outer mold and flange formed metal inner disk are shown.

[0050] Among them Figure 2 The interior of the core mold shown is divided into six evenly distributed metal hollow cylinders 3. A demoulding taper is designed along the length direction of the non-flange disk, wherein the taper of the metal hollow cylinder 3 is designed to be 1 / 1000 of the overall length of the launch tube, which is convenient for demoulding. The six metal hollow cylinders 3 are detachable, and there are supporting core shafts in the middle. The outer surface of the metal hollow cylinder 3 has protruding rifling 5, which is convenient for forming the inner rifling of the launch tube. The launch tube is fixed and assembled by a circular chassis 4 during molding. The circular chassis 4 is the molding part of the launch tube flange 2. The six metal hollow cylinders 3 are fixed on one side by the locating pins of the circular chassis 4 to ensure that the sequence of the inner rifling of each launch tube is consistent. The other side of the core mold is combined and fixed with a plum blossom disk (7) with a long axis and the previously assembled core mold circular chassis. The metal long axis 6 extends out of the circular chassis 4 to facilitate the laying of prepreg cloth. In summary, as Figure 2 The core mold shown is composed of six metal hollow cylinders 3, a circular bottom plate 4, a plum blossom plate 7 with a long axis, and a positioning pin 8.

[0051] like Figure 3 The mold sleeve 9 shown in the figure includes two parts, the left and right mold sleeves 9 are arranged according to the following Figure 1 The outer surface area of ​​the launch tube 1 shown is designed as follows Figure 4 The inner mold (12) shown in the figure is a launch tube body after mold closing. The outer parts of the left and right mold sleeves 9 are designed to be wedge-shaped with cylindrical sections, which is convenient for closing the mold by Figure 5 Pressure is evenly applied to the mating surface of the outer mold as shown, and the joint surfaces of the left and right mold sleeves 9 are chamfered to reserve extrusion capacity for the prepreg cloth at the mold joint, thereby improving the appearance quality of the launch tube and ensuring the overall mechanical structure of the launch tube 1. The left and right mold sleeves 9 are respectively provided with four positioning pins to facilitate mutual coordination and positioning during molding. The inner mold 12 of the left and right mold sleeves 9 is provided with wedge grooves and glue flow grooves of the flange-forming metal inner disk 10 to facilitate pressurization and excess glue flow during flange 2 molding. A guide groove is provided at the mold joint of the left and right mold sleeves 9 to facilitate the subsequent vacuum pre-compression and circulation of the glue during molding, compensate for the glue-deficient area inside the launch tube, and improve the quality of the launch tube.

[0052] like Figure 4 The inner mold 12 shown is a three-petal combined mold style, which is similar to a plum blossom shape after combination. The outer surface of the inner mold 12 after combination follows the inner surface of the launch tube 1. After the inner mold 12 is combined, the inner ring pressurizing device is designed to be wedge-shaped. After the wedge-shaped pin 13 is inserted, it is convenient to pressurize during molding. When the launch tube 1 is molded, the wedge-shaped pin 13 applies pressure from the left and right mold sleeves 9, so that the inner mold 12 is gradually corrected during the molding process.

[0053] like Figure 5 The outer mold shown is designed as an upper and lower mold, fixed on the press (threaded holes can also be opened on the outer mold, and screws can be used for pressure application, and the press is used for molding. The present invention adopts the press to apply pressure). The outer mold is designed with a circle of annular electric heating holes 14 and equipped with thermocouple holes, so that a uniform temperature field is formed when the launch tube 1 is molded. The inner surface of the upper and lower outer molds follows the outer surface of the mold sleeve 9, but the wedge-shaped part is about 5mm smaller than the mold sleeve 9, which is convenient for the effective transmission of pressure after the press is pressurized.

[0054] like Figure 5 The flange-shaped metal inner plate 15 shown is a wedge-shaped hexagonal upper and lower plate, which accompanies the flange of the mold sleeve 9 to facilitate the transmission of pressure through the inclined surface.

[0055] The demoulding tooling uses a drawing machine with a hydraulic mechanical device for demoulding. The demoulding tooling is used to pull the outer side of the circular chassis 4 of the core mold while ejecting six launch cylinders at the same time. The drawing machine is connected by a guide rail in the middle, and a corresponding gear rack is provided on the guide rail, and a servo motor is provided on the gear rack.

[0056] (3) Design of split-layout of array-type small-diameter common flange carbon fiber launch tube

[0057] Heat and melt the epoxy resin, and calculate the thickness of the adhesive film according to the surface density and resin content of the prepreg (the epoxy resin content of the prepreg used in the present invention is 40±3%). After the adhesive film is made, it is impregnated with the carbon fiber fabric, and the isolation film is attached and rolled up to obtain the carbon fiber / epoxy prepreg. At the same time, the ply of the array-type small-diameter common flange carbon fiber launch tube is quasi-isotropically designed and parted. The carbon fiber / epoxy prepreg is parallel to the radial fiber bundle on the prepreg at 0°, and the counterclockwise rotation angle is positive. The parting is performed according to [(0° / 90°)(45° / -45°)], and the flange is taken as follows: Figure 6 The trapezoidal prepreg (16) at the flange and the annular prepreg are alternately laid to form an interlocking lamination design, which enhances the connection strength. The prepreg of the split type is designed to be butt-jointed in an annular direction when laid on a single barrel. The length of each prepreg after splitting is controlled so that the prepreg joint seams are evenly distributed on the barrel in an annular manner, thereby ensuring the mechanical strength of the launch tube after molding and the uniformity of the thickness of the launch tube. An automatic cloth cutting machine is used to cut according to the designed pattern, and the cut prepreg is numbered to prevent confusion during laying.

[0058] (4) Forming of array-type small-diameter common flange carbon fiber launch tube

[0059] Will be like Figure 2 After the core mold shown is assembled, it is placed on the support frame and paved according to the parting of carbon fiber / epoxy prepreg. When every six metal hollow cylinders 3 are paved, a layer of trapezoidal prepreg 16 at the flange is paved at the flange, so that the trapezoidal prepreg 16 at the flange and the prepreg on the metal hollow cylinder 3 are cross-distributed. According to the thickness of the flange 2, the annular prepreg is inserted at the flange in batches during the paving process. During the paving process, the rifling 5 on the metal hollow cylinder is compacted according to the shape. According to the vacuuming situation, a 3mm wide 90° thin strip of prepreg can be used to compensate the rifling area, which is convenient for the subsequent surface flattening of the reinforced area of ​​the launch tube. Prepreg is added in the area that needs to be strengthened according to the geometric size of the launch tube. It is necessary to vacuum and pre-press each two layers of prepreg. Finally, the two layers of prepreg are paved on the inner mold 12 and the mold sleeve 9, and a scraper is used for flattening. The inner mold and the mold sleeve can be heated to 40℃~50℃ before paving. It is necessary to vacuum and pre-compact after paving.

[0060] After making the vacuum bag, the porous film and breathable felt are laid on the surface of the product in sequence, and the whole is put in and sealed with sealant. The vacuum bag should be ensured to have a pressure below -0.085MPa and the vacuum time should be more than 15 minutes.

[0061] After the paving is completed, the plum blossom disk 7 with the long mandrel is removed. Figure 2The core mold shown is placed in the mold sleeve 9, the three-petal inner mold 12 is put in sequentially, the wedge pin 13 is inserted, the flange-forming metal inner disk 15 is assembled, and the whole is placed in the left mold sleeve. The right mold sleeve is closed according to the positioning pin, and the lower outer mold placed on the press is placed. The electric heating tube and thermocouple are inserted according to the reserved electric heating hole 14, and the mold is closed. The present invention uses a temperature control cabinet next to the press to control the curing temperature, and other temperature control equipment can also be used for pressurization. The specific curing parameters are: heating to 85°C in 50min-70min, keeping warm at 85°C for 40min, heating from 85°C to 100°C in 15min, applying contact pressure (2MPa-3MPa), keeping warm at 100°C for 30min, and then heating from 100°C to 125°C-130°C in 25min, during which the contact pressure is increased to (5MPa-6MPa) and (7MPa-8MPa) twice, and then keeping warm and pressurizing at 125°C-130°C for 90min. After the pressurization is completed, Figure 5 The outer mold joint gap shown is ≤0.2mm, then the power is turned off and naturally cooled to below 60℃, the mold is opened, the mold sleeve 9 and the flange forming metal inner plate 15 are taken off, and the mold sleeve 9 and the flange forming metal inner plate 15 are taken off. Figure 2 The core mold as shown is placed on the demoulding tooling, and the demoulding is performed using a hydraulic mechanical device puller. The tube stripping machine runs slowly and evenly to remove the metal hollow tube 3 and the launch tube product. Grind the burrs of the launch tube and clean the seams to obtain Figure 1 An array-type small-diameter common-flange carbon fiber launch tube is shown.

[0062] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A one-step molding method for an array-type small-diameter common flange carbon fiber launch tube, characterized in that: The following steps are involved: (1) Design the structure of the launch tube: Design an array-type small-diameter common flange carbon fiber launch tube, perform finite element analysis on the array-type small-diameter common flange carbon fiber launch tube, and obtain a geometric model of the array-type small-diameter common flange carbon fiber launch tube; the designed array-type small-diameter common flange carbon fiber launch tube has a mounting hole at the center and multiple launch tube bodies evenly distributed in the circumference; (2) Design of molding mold and tooling: Design a molding mold based on the structural characteristics of the array-type small-diameter common flange carbon fiber launch tube. The mold is divided into a core mold, a mold sleeve, an inner mold, an outer mold, and a flange molding metal plate; design a demoulding tooling to obtain a molding mold for an array-type small-diameter common flange carbon fiber launch tube; (3) Design of the layup of the array-type small-diameter common flange carbon fiber launch tube: The carbon fiber / epoxy prepreg is impregnated by hot melt method, and the quasi-isotropic design is performed on the layup of the array-type small-diameter common flange carbon fiber launch tube. The prepreg is cut to obtain the prepreg used for the formation of the array-type small-diameter common flange carbon fiber launch tube; (4) Forming of an array-type small-diameter common flange carbon fiber launch tube: the core mold is formed by laying prepreg cloth, the inner mold and the mold sleeve are covered with prepreg cloth, vacuum pre-pressed, and the molding mold is combined. The array-type small-diameter common flange carbon fiber launch tube is formed and cured, demolded, and post-processed to obtain an array-type small-diameter common flange carbon fiber launch tube.

2. The one-step molding method of the array-type small-diameter common flange carbon fiber launch tube according to claim 1 is characterized in that: In step (1), the design of the array-type small-diameter common-flange carbon fiber launch tube is carried out by surveying and designing the single-tube diameter, length, wall thickness, rifling style, and flange connection dimensions of the launch tube combined by screwing and gluing; the screws, sealants, and connecting devices are removed during the design process, and the missing positions are supplemented by carbon fiber composite materials; the carbon fiber composite material is an intermediate prepreg formed by pre-impregnation of a reinforcement carbon fiber fabric and a resin matrix; a finite element analysis is performed on the array-type small-diameter common-flange carbon fiber launch tube, and a force analysis of the geometric model of the array-type small-diameter common-flange carbon fiber launch tube is performed using computer software, and the launch tube structure is optimized according to the design results to obtain a geometric model of the array-type small-diameter common-flange carbon fiber launch tube.

3. The one-step forming method of the array-type small-diameter common flange carbon fiber launch tube as claimed in claim 2 is characterized in that: In step (2), a forming mold is designed according to the appearance and structural characteristics of the array-type small-diameter common flange carbon fiber launch tube, and the mold is divided into a core mold, a mold sleeve, an inner mold, an outer mold, and a flange forming metal plate; There are six evenly distributed metal hollow cylinders inside the core mold. The demoulding taper is designed along the length direction of the non-flange disk. The taper is designed to be 1 / 1000 of the overall length of the launch tube. The six metal hollow cylinders are detachable. There are protruding rifling on the outer surface of the metal hollow cylinders. The launch tube is fixed and assembled by a circular chassis during molding. After the six metal hollow cylinders are assembled, the six metal hollow cylinders are fixed separately on one side of the core mold by the locating pins of the circular chassis, and the other side of the core mold is fixed with a plum blossom disk combination with a long axis; the mold sleeve is divided into left and right parts. The interior of the left and right mold sleeves is designed according to the outer surface of the launch tube, and the exterior of the left and right mold sleeves is designed as a wedge-shaped style of a cylindrical segment, which is convenient for passing through the outer mold when closing the mold. Pressure is applied evenly to the mating surface segment, and the mating surfaces of the left and right mold sleeves are chamfered. Four locating pins are left in the left and right mold sleeves. Wedge grooves and glue flow grooves for flange-forming metal inner disks are left at the inner and outer molds of the left and right mold sleeves, and guide grooves are left at the joint of the left and right mold sleeves. The inner mold is a three-petal combination mold. The outer surface of the inner mold after assembly follows the inner surface of the launch tube. After the inner mold is assembled, the inner ring pressure device is wedge-shaped. After the wedge-shaped pin is inserted, pressure is applied by the left and right mold sleeves during molding. The outer mold is designed as an upper and lower mold, which is fixed on the press. A circle of annular electric heating holes is designed on the outer mold, which is equipped with thermocouple holes. The inner surfaces of the upper and lower outer molds follow the outer surface of the mold sleeves. The flange-forming metal inner disk is a wedge-shaped hexagonal upper and lower disk.

4. The one-step forming method of the array-type small-diameter common flange carbon fiber launch tube as claimed in claim 3 is characterized in that: In step (2), demoulding is performed using a hydraulic mechanical drawing machine, wherein the demoulding tooling is configured to draw the core mold on one side and eject the launch cylinder on the other side, with a guide rail in the middle, a corresponding gear rack on the guide rail, and a servo motor on the gear rack.

5. The one-step forming method of the array-type small-diameter common flange carbon fiber launch tube as claimed in claim 4 is characterized in that: In step (3), the carbon fiber / epoxy prepreg is impregnated by hot melt method, the epoxy resin is heated and melted, and the thickness of the adhesive film is calculated according to the surface density and resin content of the prepreg. After the adhesive film is formed, it is impregnated with the carbon fiber fabric, and an isolation film is attached and rolled up to obtain the carbon fiber / epoxy prepreg.

6. The one-step forming method of the array-type small-diameter common flange carbon fiber launch tube as claimed in claim 5, characterized in that: In step (3), the array-type small-diameter common flange carbon fiber launch tube ply is quasi-isotropically designed and parted, the carbon fiber / epoxy prepreg is parted according to [(0° / 90°)(45° / -45°)], the flange is designed by opening a trapezoidal opening and alternatingly laying annular prepregs, the parted prepregs are designed by circumferential butt jointing when being laid on a single barrel, and the length of the prepregs after parting is controlled so that the butt joints of the prepregs are evenly distributed on the barrel.

7. The one-step forming method of the array-type small-diameter common flange carbon fiber launch tube according to claim 6, characterized in that: In step (4), the core mold prepreg is laid and formed. After the core mold is assembled, it is placed on a support frame and laid separately according to the parting of the prepreg. When every six metal hollow cylinders are laid, a layer of prepreg with a trapezoidal opening is laid on the flange forming circular chassis, so that the trapezoidal opening prepreg at the flange and the prepreg on the metal hollow cylinder are cross-distributed. According to the thickness of the flange, the annular cloth is inserted in batches during the laying process, and the metal cylinder rifling is compacted according to the shape during the laying process.

8. The one-step forming method of the array-type small-diameter common flange carbon fiber launch tube as claimed in claim 7, characterized in that: In step (4), the inner mold and mold sleeve are covered with prepreg, two layers of prepreg are laid on the inner mold and the mold sleeve, and a scraper is used to flatten them. The inner mold and the mold sleeve are heated to 40°C to 50°C before laying; the vacuum pre-pressing is performed for each two layers of prepreg, and the inner mold and the mold sleeve are vacuumed and compacted after the laying is completed; after the vacuum bag is made, a porous membrane and a breathable felt are laid on the surface of the product in sequence, and the whole is placed in and sealed with a sealant; when the vacuum bag is vacuumed, the pressure in the vacuum bag is below -0.085MPa, and the vacuuming time is more than 15 minutes.

9. The one-step forming method of the array-type small-diameter common flange carbon fiber launch tube as claimed in claim 8, characterized in that: In step (4), when assembling the molding mold, the plum blossom disk with the long axis is removed, the core mold is placed in the mold sleeve, and the three-petal inner mold is sequentially placed in the gaps between the six launch tubes of the core mold after the prepreg is laid, and a wedge pin is inserted into the center of the three-petal inner mold; the flange-molded metal inner disk is assembled and placed in the left mold sleeve as a whole, the right mold sleeve is closed according to the positioning pin, and the lower outer mold is placed on the press, and the electric heating tube and thermocouple are inserted according to the reserved electric heating holes, and the mold is closed.

10. The one-step forming method of the array-type small-diameter common flange carbon fiber launching tube according to claim 9, characterized in that: In step (4), the array-type small-diameter common flange carbon fiber launch tube is formed and cured, and the curing temperature is controlled by a temperature control cabinet next to the press, and the parameters are: within 50min to 70min, the temperature is raised to 85°C, kept at 85°C for 40min, the temperature is raised from 85°C to 100°C in 15min, a contact pressure of 2MPa to 3MPa is applied, and the temperature is kept at 100°C for 30min, and then the temperature is raised from 100°C to 125°C to 130°C in 25min, during which the contact pressure is increased from 5MPa to 6MPa and 7MPa to 8MPa twice. MPa, and then keep it warm and pressurized at 125℃~130℃ for 90min. After the pressurization is completed, the mold seam is ≤0.2mm, and then the power is turned off and it is cooled naturally. When demolding, the mold is naturally cooled to below 60℃, the mold is removed, the mold sleeve and the flange forming inner disk are taken off, and the core mold is placed on the demolding tooling as a whole. The drawing machine of the hydraulic mechanical device is used for demolding, and the tube stripping machine runs slowly and uniformly to separate the metal hollow tube and the launch tube product. In post-processing, the burrs of the launch tube after demolding are polished and the joints are cleaned to obtain an array-type small-diameter common flange carbon fiber launch tube.

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