A guide rail type composite pressure-resistant shell with reinforced structure and its forming die and method

Abstract

The present invention relates to the technical field of composite materials, and in particular to a guide rail type composite pressure-resistant shell containing a reinforced structure and a molding die and method thereof, wherein the mold comprises a core shaft, and an annular core mold is arranged on the periphery of the core shaft; a plurality of guide rail grooves are arranged on the outer surface of the core mold, and a plurality of fan-shaped arc plates are covered on the outer surface of the core mold between two adjacent guide rail grooves, and an annular reinforcing rib groove is arranged between two adjacent fan-shaped arc plates along the length direction; a plurality of fastening through holes are arranged at intervals along the length on the outer surface of the core mold, and a fastening blind hole corresponding to each fastening through hole is arranged on the inner surface of each fan-shaped arc plate; an elastic member is installed in the fastening blind hole, and one end of the elastic member is fixedly connected to the bottom of the fastening blind hole; a pin slidably inserted into each fastening blind hole is also included; each fastening blind hole is filled with a high-temperature fusible filler that pushes one end of the pin out of the fastening blind hole; the present invention integrates the guide rails and the reinforcing ribs with the pressure-resistant shell, and can achieve a further weight reduction effect while improving the stability of the shell structure.

Description

Technical Field

[0001] The present invention relates to the technical field of composite materials, and in particular to a rail-type composite pressure-resistant shell containing a reinforced structure and a molding die and a molding method thereof. Background Art

[0002] Carbon fiber composites have obvious advantages in underwater pressure hulls, such as high rearrangement ratio. Due to their good modulus and strength, carbon fiber composites have more ideal specific strength and specific modulus than commonly used metal materials such as aluminum, titanium, stainless steel, etc. At the same time, metal materials have many problems. For example, aluminum has corrosion and insufficient modulus, stainless steel has excessive weight, and titanium alloys have high cost and high molding difficulty. Therefore, carbon fiber composites have great advantages as a high specific strength, high specific modulus, and corrosion-resistant material. At the same time, composite materials have good designability, that is, based on the anisotropic material foundation, the carbon fiber composite ply can be designed according to parameters such as the aspect ratio of the pressure hull and the operating pressure to form an optimization plan, further enhancing the application advantages of carbon fiber composites.

[0003] As the water depth of the pressure hull gradually increases, the single-walled pressure hull can no longer meet the need for weight reduction, and the hull needs to be reinforced with an internal reinforcement rib structure. After reinforcement, the pressure hull has a certain improvement in strength and structural stability, and can further reduce weight. Therefore, when designing a pressure hull with strict weight indicators, an internal reinforcement rib structure is usually used; and some instruments or battery modules usually need to be built into the UUV carbon fiber pressure hull. These built-in objects need to enter and exit the pressure hull through guide rails. Therefore, it is usually adopted to add metal or composite material rails in the form of mechanical connection or adhesive connection inside the composite pressure hull. The built-in guide rails can effectively position and guide the built-in objects in the pressure hull. It is a necessary component of some functional pressure-resistant shells; the existing preparation methods of guide rail-type annularly reinforced composite pressure-resistant shells are mostly to first form the composite shell and then connect the guide rails. The process needs to go through cumbersome process flows such as shell forming, bonding, and polishing, and it is difficult to ensure precision control during bonding and polishing post-processing, requiring a lot of manpower and energy for repeated operations, or using a mechanical connection guide rail method, using metal gaskets under the guide rails to adjust the size, drilling holes inside the composite pressure-resistant shell, and using screws to fasten the guide rails to the inside of the shell, which will lead to a decrease in the structural strength and stability of the shell; in order to ensure the stability of the shell structure, the guide rail-type annularly reinforced composite pressure-resistant shell needs to be integrally formed.

[0004] It is a relatively difficult problem to simultaneously form guide rails and annular stiffeners inside a composite pressure hull. The first thing is to design and manufacture the mold. The stiffener module needs to be effectively fixed to the main mold surface during winding and be able to be easily separated during demolding. Currently, it is more common to use transition molds made of silicone rubber and foam materials. However, the strength and modulus of such molds decrease at high temperatures, and the inner cavity of the molded product usually has low dimensional accuracy. It can be used to manufacture annular stiffener structures, but it is not applicable to built-in guide rails due to poor accuracy. Therefore, the mold design and molding method of the composite pressure hull with guide rails and annular reinforcement suitable for integrated molding is an important issue that needs to be studied at present.

[0005] For example, Chinese patent CN111238307B discloses an integrated missile storage and transportation launch box and a manufacturing method thereof, which discloses a guide rail for limiting the circumferential movement of the missile, a box body and a load-bearing frame, wherein the box body is composed of a foam box body, a dry glass fiber cloth located outside the box body and a dry carbon fiber cloth located inside the box body, the guide rail is composed of dry carbon fiber cloth, and the load-bearing frame is composed of dry glass fiber cloth, the above guide rail, box body and load-bearing frame are sewn together by nylon thread, and an anti-ablation coating is provided on the inner wall of the box body; polyimide resin is filled between the above contact layers; wherein the guide rail, the load-bearing frame are used The process route of integrally forming the frame and the box body uses foam for lightweight design. In order to improve the connection strength between the foam and the box body, nylon thread is used to sew the two together. However, since the raw materials are dry glass fiber cloth and dry carbon fiber cloth, it can be seen that the manufacturing process involved in this patent is a laying process. The laying process is feasible for thinner products, but when the thickness of the product increases, pre-tightening and pre-curing are required in multiple times, and when the thickness increases, the number and size of the wrinkles in the cloth layer will increase, which seriously affects the utilization rate of the mechanical properties of the composite material. Therefore, it is not suitable for the product type involved in the present invention.

[0006] For example, Chinese patent CN115682831A discloses a launch tube with a guide rail and a molding process, which includes a resin-based composite material launch tube and a composite guide rail arranged inside the resin-based composite material launch tube, wherein the composite guide rail includes a first wear-resistant material layer and a second resin-based composite material layer fixed to each other, and the composite guide rail is adhered to the inner wall of the resin-based composite material launch tube through the second resin-based composite material layer; however, in this invention, the guide rail is located inside the launch tube, and the reinforcing ribs are located on the outer surface of the launch tube, and the pressure-resistant shell that needs to be molded in the present invention needs to withstand the load of external water pressure, so the side wall of the shell is relatively thick. In order to effectively reduce weight, an internal reinforcement structure and an internal guide rail structure need to be adopted, which is more difficult in mold design, and therefore is not suitable for the product type involved in the present invention.

[0007] Therefore, in view of the above problems, the present invention urgently needs to provide a rail-type composite pressure-resistant shell with a reinforced structure and a molding die and method thereof. Summary of the invention

[0008] The technical problem solved by the present invention is to provide a guide rail type composite pressure-resistant shell with a reinforced structure and its molding mold and method. The mold design with an automatically unlocked fastening structure solves the problems of the difficult molding of the internal reinforcement structure and the internal guide rail structure in the prior art, and the one-piece molding of the guide rail type annularly reinforced composite pressure-resistant shell can be achieved.

[0009] The present invention provides a guide rail type composite pressure-resistant shell forming die with a reinforced structure, comprising a mandrel, an annular mandrel is arranged on the periphery of the mandrel, and the annular mandrel is connected to the mandrel by a plurality of connecting rods;

[0010] The outer surface of the core mold is provided with a plurality of guide rail grooves at intervals along the circumference, each guide rail groove is arranged along the length of the core mold, the outer surface of the core mold between two adjacent guide rail grooves is covered with a plurality of fan-shaped arc plates at intervals along the length, and an annular reinforcing rib groove is provided between two adjacent fan-shaped arc plates along the length direction, and the depth of the annular reinforcing rib groove is the same as the thickness of the fan-shaped arc plate; the outer surface of the core mold between two adjacent guide rail grooves is provided with a plurality of fastening through holes penetrating the core mold at intervals along the length, and the inner surface of each fan-shaped arc plate is provided with a fastening blind hole corresponding to each fastening through hole one by one;

[0011] An elastic member is installed in the fastening blind hole, one end of which is fixedly connected to the bottom of the fastening blind hole; it also includes a pin that can be slidably inserted into each fastening blind hole, the pin is fixedly connected to the elastic member; each fastening blind hole is filled with a high-temperature fusible filler that pushes one end of the pin out of the fastening blind hole.

[0012] Preferably, the elastic member is a spring, and the high-temperature fusible filler is wax.

[0013] Preferably, the pin surface is provided with a plurality of axial injection holes, through which the melted high-temperature fusible filler can be injected between the pin and the bottom of the fastening blind hole to prevent the elastic member from rebounding after solidification.

[0014] Preferably, a weight-reducing groove is dug on the inner surface of each sector-shaped arc plate, and the weight-reducing groove is arranged around the fastening blind hole. A plurality of arc-shaped reinforcing ribs are also arranged in the weight-reducing groove for connecting the side wall of the fastening blind hole and the outer edge of the sector-shaped arc plate.

[0015] The present invention also provides a method for forming a rail-type composite pressure-resistant shell with a reinforced structure, comprising the following steps:

[0016] Preparation of a guide rail type composite pressure-resistant shell forming mold containing a reinforced structure;

[0017] Laying a first reinforcing cloth in the guide rail groove to form a first reinforcing layer, and stopping laying after the upper surface of the first reinforcing layer is flush with the outer surface of the core mold to obtain a guide rail layer;

[0018] Winding the first fiber in each annular reinforcing rib groove along the annular direction until the upper surface of the first fiber is flush with the outer surface of each fan-shaped arc plate, and then stopping the winding to obtain a reinforcing rib layer;

[0019] A second reinforcing cloth is laid on the area above the guide rail layer that is not covered by the reinforcing rib layer until the upper surface of the second reinforcing cloth is flush with the outer surface of the reinforcing rib layer, and then the laying is stopped to obtain a connecting layer;

[0020] The second fiber is wound around the reinforcing rib layer, the connecting layer and the outer edge of each fan-shaped arc plate in a circumferential direction, and the winding is stopped after the winding reaches a certain thickness, so as to obtain a pressure-resistant shell prefabricated part;

[0021] After heating and curing, the core mold and each fan-shaped arc plate are demoulded in sequence from the inside of the pressure shell prefabricated part to obtain a rail-type composite pressure shell with a reinforced structure.

[0022] Preferably, the material of the first reinforcing cloth is a unidirectional carbon fiber cloth layer impregnated with resin. Before laying the first cloth layer, the outer surfaces of the core mold and each fan-shaped arc plate are polished with sandpaper and coated with a release agent.

[0023] Preferably, the second reinforcing cloth is made of resin-impregnated carbon fiber fabric; when laying the second reinforcing cloth, a lightweight material with a fabric covering matching the shape of the connecting layer can be used for laying, wherein the lightweight material is high temperature resistant foam or glass beads.

[0024] Preferably, the second reinforcing cloth is a fabric with a plain weave structure, a grid structure or a honeycomb structure.

[0025] Preferably, before winding the second fiber, an ellipsoidal head is used to limit the two ends of the core mold.

[0026] The present invention also provides a rail-type composite pressure-resistant shell with a reinforced structure, comprising a main shell, wherein the inner surface of the main shell is provided with a plurality of rails along the length direction, and the inner surface of the main shell is also provided with a plurality of annular reinforcing ribs at intervals along the length direction;

[0027] The main shell is composed of a structural layer, the guide rail is composed of a guide rail layer and a connecting layer, and the annular reinforcement rib is composed of a reinforcement rib layer.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention provides a rail-type composite pressure-resistant shell with a reinforced structure, which eliminates the current method of first forming a composite shell inside the pressure shell and then bonding or mechanically connecting the rail inside the pressure shell. Instead, the rail and the reinforcement ribs are integrated with the pressure shell, and the rail is arranged inside the pressure shell to facilitate the installation and positioning of the internal device; at the same time, annular reinforcement ribs are arranged inside the shell, which can improve the stability of the shell structure while achieving further weight reduction effect. Due to the one-piece molding, the dimensional stability, process simplification and cost control are improved, and it can be widely used in aerospace, weapons and ships and other fields;

[0030] 2. The present invention provides a molding mold and molding method for a rail-type composite pressure-resistant shell with a reinforced structure. Through reasonable mold optimization design, the mold is modularly combined and designed, and the winding / laying process is designed according to the required performance of different positions of the rail-type composite pressure-resistant shell with a reinforced structure, so that the pressure shell, the guide rail and the annular reinforcement ribs can be integrally formed. According to the high-temperature environment characteristics of the wet winding and curing of the composite material, the present invention designs a device that can remain tight at low temperatures and automatically rebound at high temperatures, which can achieve effective fixation during fiber winding and effective separation during demolding, so that the mold will not be damaged during demolding, and the mold can be reused. The present invention can realize the integrated molding of the rail-type composite pressure-resistant shell with a reinforced structure by modularly designing the mold, which can effectively shorten the cycle required for product preparation, reduce the risk of dimensional tolerance deviation and quality risks caused by the later assembly of various components, improve production efficiency and dimensional accuracy, and the integrated composite pressure-resistant shell has better structural performance than step-by-step molding, and improves reliability and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 : is a structural schematic diagram (front view) of a guide rail type composite pressure-resistant shell forming mold with a reinforced structure according to an embodiment of the present invention;

[0032] Figure 2 It is a state diagram (cross-sectional view) of the guide rail type composite pressure-resistant shell forming mold with reinforced structure according to an embodiment of the present invention after heating and curing;

[0033] Figure 3 is an enlarged view of the fastening structure according to the embodiment of the present invention before high temperature curing;

[0034] Figure 4 is an enlarged view of the fastening structure according to the embodiment of the present invention after high temperature curing;

[0035] Figure 5 is a schematic diagram (cross-sectional view) of the installation of the fan-shaped arc plate and the fastening structure according to an embodiment of the present invention;

[0036] Figure 6 is a schematic structural diagram of the fan-shaped arc plate according to an embodiment of the present invention (rear view);

[0037] Figure 7 is a schematic structural diagram of a guide rail layer according to an embodiment of the present invention;

[0038] Figure 8 is a schematic structural diagram of a reinforcing rib layer according to an embodiment of the present invention;

[0039] Fig. 9 is a schematic structural diagram of a connection layer according to an embodiment of the present invention;

[0040] Fig.10 It is a structural schematic diagram (stereoscopic diagram) of a rail-type composite pressure-resistant shell with a reinforced structure according to an embodiment of the present invention;

[0041] Fig.11 It is a structural schematic diagram (cross-sectional view) of a rail-type composite pressure-resistant shell with a reinforced structure according to an embodiment of the present invention;

[0042] Fig.12 It is an operation flow chart of the method for forming a guide rail type composite pressure-resistant shell with a reinforced structure according to an embodiment of the present invention.

[0043] Among them: 1. mandrel; 2. core mold; 201. fastening through hole; 3. connecting rod; 401. fan-shaped arc plate; 4011. weight reduction groove; 4012. fastening blind hole; 4013. arc-shaped reinforcement rib; 5. fastening structure; 501. pin; 502. elastic part; 503. filler; 6. annular reinforcement rib groove; 7. guide rail groove; 8. main shell; 9. guide rail; 10. annular reinforcement rib. DETAILED DESCRIPTION

[0044] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solution of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, this embodiment provides a guide rail type composite pressure-resistant shell forming mold with a reinforced structure, comprising a core shaft 1, an annular core mold 2 is arranged on the periphery of the core shaft 1, and the annular core mold 2 is connected to the core shaft 1 through a plurality of connecting rods 3;

[0046] The outer surface of the core mold 2 is provided with a plurality of guide rail grooves 7 at intervals along the circumference, and each guide rail groove 7 is arranged along the length of the core mold 2. The outer surface of the core mold 2 between two adjacent guide rail grooves 7 is covered with a plurality of fan-shaped arc plates 401 at intervals along the length, and an annular reinforcing rib groove 6 is provided between two adjacent fan-shaped arc plates 401 along the length direction, and the depth of the annular reinforcing rib groove 6 is the same as the thickness of the fan-shaped arc plate 401; the outer surface of the core mold 2 between two adjacent guide rail grooves 7 is provided with a plurality of fastening through holes 201 penetrating the core mold 2 at intervals along the length, and the inner surface of each fan-shaped arc plate 401 is provided with a fastening blind hole 4012 corresponding to each fastening through hole 201 one by one;

[0047] An elastic member 502 is installed in the fastening blind hole 4012, and one end of the elastic member 502 is fixedly connected to the bottom of the fastening blind hole 4012; it also includes a pin 501 that can be slidably installed in each fastening blind hole 4012, and the pin 501 is fixedly connected to the elastic member 502; each fastening blind hole 4012 is filled with a high-temperature fusible filler 503 that pushes one end of the pin 501 out of the fastening blind hole 4012.

[0048] The present invention provides a forming mold for a rail-type composite pressure shell with a reinforced structure. Through reasonable mold optimization design, the mold is modularly combined and designed, and the winding / laying process is designed according to the required performance of different positions of the rail-type composite pressure shell with a reinforced structure, so that the pressure shell, the guide rail 9 and the annular reinforcement ribs 10 can be integrally formed; according to the high-temperature environment characteristics of the wet winding and curing of the composite material, the present invention designs a device that can remain tight at low temperatures and automatically rebound at high temperatures, which can achieve effective fixation during fiber winding and effective separation during demolding, so that the mold will not be damaged during demolding, and the mold can be reused; the present invention can realize the integrated molding of the rail-type composite pressure shell with a reinforced structure by modularly designing the mold, which can effectively shorten the cycle required for product preparation, reduce the risk of dimensional tolerance deviation and quality risks caused by the later assembly of various components, improve production efficiency and dimensional accuracy, and the integrated composite pressure shell has better structural performance than step-by-step molding, and improves reliability and safety.

[0049] In this embodiment, the elastic member 502 is a spring, and the high temperature fusible filler 503 is wax.

[0050] In the present invention, the high temperature fusible filler 503 is injected between the pin 501 and the bottom of the fastening blind hole 4012. After cooling, the solidified high temperature fusible filler 503 can prevent the elastic member 502 from rebounding. Then, each sector arc plate 401 and the core mold 2 can be positioned by pushing the pin 501 out of the fastening blind hole 4012. At the same time, an appropriate amount of adhesive having a bonding force greater than the weight of each sector arc plate 401 is used to bond and fix each sector arc plate 401 to the core mold 2. During the high temperature curing process, as the temperature rises, When the temperature reaches the melting point of the high-temperature fusible filler 503, the high-temperature fusible filler 503 flows out from the hole of the pin 501 and cannot support the elastic part 502. The elastic part 502 contracts and brings the pin 501 back into the fastening blind hole 4012, releasing the positioning of each fan-shaped arc plate 401 and the core mold 2. At this time, the core mold 2 is pulled out axially from the inside of the pressure-resistant shell, and then a force greater than the bonding force of the adhesive is used to demold each fan-shaped arc plate 401 radially of the pressure-resistant shell, so that a guide rail-type composite pressure-resistant shell with a reinforced structure can be obtained.

[0051] like Figure 3 , Figure 4 , Figure 5 As shown, the surface of the pin 501 is provided with a plurality of axial injection holes, through which the melted high-temperature fusible filler 503 can be injected between the pin 501 and the bottom of the fastening blind hole 4012 to prevent the elastic member 502 from rebounding after solidification.

[0052] like Figure 6 As shown, a weight-reducing groove 4011 is dug on the inner surface of each sector-shaped arc plate 401 , and the weight-reducing groove 4011 is arranged around the fastening blind hole 4012 . A plurality of arc-shaped reinforcing ribs 4013 for connecting the side wall of the fastening blind hole 4012 and the outer edge of the sector-shaped arc plate 401 are also arranged in the weight-reducing groove 4011 .

[0053] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Fig.12 As shown, this embodiment provides a method for forming a rail-type composite pressure-resistant shell with a reinforced structure, comprising the following steps:

[0054] Preparation of a guide rail type composite pressure-resistant shell forming mold containing a reinforced structure;

[0055] Among them, after the pin 501 is stretched and positioned, a filler 503 melted at high temperature is injected between the elastic member 502 and the bottom of the fastening blind hole 4012. After the filler 503 is cooled, the pin 501 is prevented from rebounding. After each fan-shaped arc plate 401 is installed on the outer surface of the core mold 2, the fastening structure 5 can fasten each fan-shaped arc plate 401 and the annular core mold 2;

[0056] like Figure 7 As shown, a first reinforcing cloth is laid in the guide rail groove 7 to form a first reinforcing layer, and the laying is stopped until the upper surface of the first reinforcing layer is flush with the outer surface of the core mold 2 to obtain a guide rail layer;

[0057] like Figure 8 As shown, above the guide rail layer and the core mold 2, along the direction of each annular reinforcing rib groove 6, the first fiber is wound in the annular reinforcing rib groove 6 in the annular reinforcing rib groove 6, and the winding is stopped after the upper surface of the first fiber is flush with the outer surface of each fan-shaped arc plate 401, thereby obtaining a reinforcing rib layer;

[0058] like Fig. 9 As shown, a second reinforcing cloth is laid on the area above the guide rail layer that is not covered by the reinforcing rib layer until the upper surface of the second reinforcing cloth is flush with the outer surface of the reinforcing rib layer, and then the laying is stopped to obtain a connecting layer;

[0059] The second fiber is wound around the reinforcing rib layer, the connecting layer and the outer edge of each fan-shaped arc plate 401 in a circumferential direction, and the winding is stopped after a certain thickness is reached, so as to obtain a pressure-resistant shell preform;

[0060] After heating and curing, the core mold 2 and each fan-shaped arc plate 401 are demoulded in sequence from the inside of the pressure-resistant shell prefabricated part to obtain a rail-type composite pressure-resistant shell with a reinforced structure.

[0061] In the present invention, the high temperature fusible filler 503 is injected between the pin 501 and the bottom of the fastening blind hole 4012. After cooling, the solidified high temperature fusible filler 503 can prevent the elastic member 502 from rebounding. Then, each sector arc plate 401 and the core mold 2 can be positioned by pushing the pin 501 out of the fastening blind hole 4012. At the same time, an appropriate amount of adhesive having a bonding force greater than the weight of each sector arc plate 401 is used to bond and fix each sector arc plate 401 to the core mold 2. During the high temperature curing process, as the temperature rises, When the temperature reaches the melting point of the high-temperature fusible filler 503, the high-temperature fusible filler 503 flows out from the hole of the pin 501 and cannot support the elastic part 502. The elastic part 502 contracts and brings the pin 501 back into the fastening blind hole 4012, releasing the positioning of each fan-shaped arc plate 401 and the core mold 2. At this time, the core mold 2 is pulled out axially from the inside of the pressure-resistant shell, and then a force greater than the bonding force of the adhesive is used to demold each fan-shaped arc plate 401 radially of the pressure-resistant shell, so that a guide rail-type composite pressure-resistant shell with a reinforced structure can be obtained.

[0062] The present invention provides a molding method for a rail-type composite pressure hull with a reinforced structure. The mold is modularly combined and designed through reasonable mold optimization design, and the winding / laying process is designed according to the required performance of different positions of the rail-type composite pressure hull with a reinforced structure, so that the pressure hull, the guide rail and the annular reinforcement ribs can be integrally molded. According to the high-temperature environment characteristics of the composite material during wet winding and curing, the present invention designs a device that can remain tight at low temperatures and automatically rebound at high temperatures, which can achieve effective fixation during fiber winding and effective separation during demolding, so that the mold will not be damaged during demolding, and the mold can be reused. The present invention can realize the integrated molding of the rail-type composite pressure hull with a reinforced structure by modularly designing the mold, which can effectively shorten the cycle required for product preparation, reduce the risk of dimensional tolerance deviation and quality risks caused by the later assembly of various parts, improve production efficiency and dimensional accuracy, and the composite pressure hull formed in an integrated manner has better structural performance than step-by-step molding, and improves reliability and safety.

[0063] In this embodiment, the material of the first reinforcing cloth is a unidirectional carbon fiber cloth layer impregnated with resin. Before laying the first cloth layer, the outer surfaces of the core mold 2 and each fan-shaped arc plate 401 are polished with sandpaper and coated with a release agent.

[0064] In this embodiment, the material of the second reinforcing cloth is carbon fiber fabric impregnated with resin; when laying the second reinforcing cloth, a lightweight material with a fabric covering matching the shape of the connecting layer can be used for laying, wherein the lightweight material is high temperature resistant foam or glass beads.

[0065] In the present invention, the lightweight material is covered with fabric and then laid, which can further achieve the weight reduction effect, and the specific strength of the connecting layer has little effect on the strength of the pressure-resistant shell of the present invention, so the strength of the pressure-resistant shell of the present invention can be guaranteed.

[0066] In the present invention, the second reinforcing cloth is a fabric with a plain weave structure, a grid structure or a honeycomb structure.

[0067] In this embodiment, before laying the first cloth layer, the outer surfaces of the core mold 2 and each fan-shaped arc plate 401 are polished with sandpaper and coated with a release agent.

[0068] In this embodiment, before winding the second fiber, an ellipsoidal head is used to limit the two ends of the core mold 2.

[0069] like Fig.10 , Fig.11As shown, this embodiment provides a guide rail type composite pressure hull with a reinforced structure prepared by a guide rail type composite pressure hull with a reinforced structure forming method, characterized in that: it includes a main shell 8, the inner surface of the main shell 8 is provided with a plurality of guide rails 9 along the length direction, and the inner surface of the main shell 8 is also provided with a plurality of annular reinforcing ribs 10 at intervals along the length direction;

[0070] The main shell 8 is composed of a structural layer, the guide rail 9 is composed of a guide rail layer and a connecting layer, and the annular reinforcement rib 10 is composed of a reinforcement rib layer.

[0071] The present invention provides a guide rail type composite pressure-resistant shell with a reinforced structure, which eliminates the current method of first forming a composite shell inside the pressure shell and then bonding or mechanically connecting the guide rail 9 inside the pressure shell. Instead, the guide rail and the reinforcement ribs are integrated with the pressure shell, and the guide rail is arranged inside the pressure shell to facilitate the installation and positioning of the internal device. At the same time, annular reinforcement ribs are arranged inside the shell, which can achieve further weight reduction while improving the stability of the shell structure. Due to the one-piece molding, the dimensional stability, process simplification and cost control are improved, and it can be widely used in aerospace, weapons and ships and other fields.

[0072] The present invention also provides an embodiment, wherein the rail-type composite pressure-resistant shell with a reinforced structure comprises a main shell 8, the inner surface of the main shell 8 is provided with 4 rails 9 along the length direction, and the inner surface of the main shell 8 is also provided with a plurality of annular reinforcing ribs 10 at intervals along the length direction; the outer diameter of the main shell 8 is 700 mm, the length is 2000 mm, the thickness is 35 mm, the inner diameter of the reinforcing rib 10 is 610 mm, and the inner diameter of the rail 9 is 600 mm;

[0073] The molding method comprises the following steps:

[0074] Preparation of a guide rail type composite pressure-resistant shell forming mold containing a reinforced structure;

[0075] Lay the first cloth layer along the direction of the guide rail groove 7 until the upper surface of the first cloth layer is flush with the bottom surface of the annular reinforcement groove 6, that is, stop laying at φ610 to obtain the guide rail layer;

[0076] Winding the first fiber in each annular reinforcing rib groove 6 until the upper surface of the first fiber is flush with the outer surface of each fan-shaped arc plate 401, that is, stopping the winding at φ630 to obtain a reinforcing rib layer;

[0077] The second cloth layer is laid on the area above the guide rail layer that is not covered by the reinforcement layer until the upper surface of the second cloth layer is flush with the outer surface of the reinforcement layer to obtain a connecting layer; the density is 0.2kg / m 2The carbon fiber twill fabric is impregnated and laid in the groove of the area, with 3 layers, and BMI high temperature resistant foam is put into the impregnated cloth layer, and the outer surface is flush with Φ630;

[0078] The second fiber is wound around the reinforcing rib layer, the connecting layer and each fan-shaped arc plate 401, and the winding is stopped after winding to a certain thickness to obtain a structural layer; wherein the winding is performed according to a predetermined line shape to Φ700, and a processing allowance is left;

[0079] Heating and curing. During the curing period, as the temperature rises to exceed the melting point of the high-temperature fusible filler 503, the elastic member 502 rebounds to retract the pin 502 from the fastening through hole 201 to the fastening blind hole 4012, unlocking the core mold 2 and each fan-shaped arc plate 401;

[0080] The core mold 2 and each fan-shaped arc plate 401 are demoulded in sequence, and the excess is removed by mechanical processing to obtain a guide rail type composite pressure-resistant shell with a reinforced structure.

[0081] After testing, the guide rail type composite pressure hull with reinforced structure obtained in this embodiment can reduce the weight by 7-9% compared with the guide rail type reinforced composite pressure hull with the same inner diameter as the inner diameter of the reinforcement ribs described in this embodiment under the same size and pressure environment.

[0082] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A guide rail type composite pressure shell forming die with reinforced structure, characterized in that: It comprises a core shaft (1), an annular core mold (2) is arranged on the periphery of the core shaft (1), and the annular core mold (2) and the core shaft (1) are connected via a plurality of connecting rods (3); The outer surface of the core mold (2) is provided with a plurality of guide grooves (7) at intervals in the circumferential direction, each guide groove (7) is arranged along the length of the core mold (2), the outer surface of the core mold (2) between two adjacent guide grooves (7) is covered with a plurality of fan-shaped arc plates (401) at intervals along the length, an annular reinforcing rib groove (6) is provided between two adjacent fan-shaped arc plates (401) along the length direction, and the depth of the annular reinforcing rib groove (6) is the same as the thickness of the fan-shaped arc plate (401); the outer surface of the core mold (2) between two adjacent guide grooves (7) is provided with a plurality of fastening through holes (201) penetrating the core mold (2) at intervals along the length, and the inner surface of each fan-shaped arc plate (401) is provided with a fastening blind hole (4012) corresponding to each fastening through hole (201) one by one; An elastic member (502) is installed in the fastening blind hole (4012), and one end of the elastic member (502) is fixedly connected to the bottom of the fastening blind hole (4012); it also includes a pin (501) that can be slidably installed in each fastening blind hole (4012), and the pin (501) is fixedly connected to the elastic member (502); each fastening blind hole (4012) is filled with a high-temperature fusible filler (503) that pushes one end of the pin (501) out of the fastening blind hole (4012); in, The surface of the pin (501) is provided with a plurality of injection holes along the axial direction, and the melted high-temperature fusible filler (503) is injected between the pin (501) and the bottom of the fastening blind hole (4012) to prevent the elastic member (502) from rebounding after solidification. At the same time, an appropriate amount of adhesive having a bonding force greater than the weight of each fan-shaped arc plate (401) is used to bond and fix each fan-shaped arc plate (401) to the core mold (2); during the high-temperature curing process, as the temperature rises, after the temperature reaches the melting point of the high-temperature fusible filler (503), the high-temperature fusible filler (503) flows out from the injection hole, the elastic member (502) contracts, and the pin (501) is brought back into the fastening blind hole (4012).

2. The guide rail type composite pressure-resistant shell forming mold with reinforced structure according to claim 1, characterized in that: The elastic member (502) is a spring, and the high-temperature fusible filler (503) is wax.

3. The guide rail type composite pressure-resistant shell forming mold with reinforced structure according to claim 2, characterized in that: A weight-reducing groove (4011) is dug on the inner surface of each sector-shaped arc plate (401), and the weight-reducing groove (4011) is arranged around the fastening blind hole (4012). A plurality of arc-shaped reinforcing ribs (4013) for connecting the side wall of the fastening blind hole (4012) and the outer edge of the sector-shaped arc plate (401) are also arranged in the weight-reducing groove (4011).

4. A method for forming a rail-type composite pressure-resistant shell with a reinforced structure, characterized in that: The steps include: Prepare a guide rail type composite pressure-resistant shell forming mold containing a reinforced structure as described in any one of claims 1 to 3; Laying a first reinforcing cloth in the guide rail groove (7) to form a first reinforcing layer, and stopping laying until the upper surface of the first reinforcing layer is flush with the outer surface of the core mold (2), thereby obtaining a guide rail layer; Winding the first fiber in the annular reinforcing rib grooves (6) in an annular direction until the upper surface of the first fiber is flush with the outer surface of each fan-shaped arc plate (401), and then stopping the winding to obtain a reinforcing rib layer; A second reinforcing cloth is laid on the area above the guide rail layer that is not covered by the reinforcing rib layer until the upper surface of the second reinforcing cloth is flush with the outer surface of the reinforcing rib layer, and then the laying is stopped to obtain a connecting layer; Winding a second fiber in a circumferential direction around the reinforcing rib layer, the connecting layer and the outer edges of each fan-shaped arc plate (401), and stopping the winding after winding to a certain thickness, thereby obtaining a pressure-resistant shell prefabricated part; After heating and curing, the core mold (2) and each fan-shaped arc plate (401) are demoulded in sequence from the inside of the pressure-resistant shell prefabricated part to obtain a rail-type composite pressure-resistant shell with a reinforced structure.

5. The method for forming a rail-type composite pressure-resistant shell with a reinforced structure according to claim 4, characterized in that: The material of the first reinforcing cloth is a unidirectional carbon fiber cloth layer impregnated with resin. Before laying the first cloth layer, the outer surfaces of the core mold (2) and each fan-shaped arc plate (401) are polished with sandpaper and coated with a release agent.

6. The method for forming a rail-type composite pressure-resistant shell with a reinforced structure according to claim 5, characterized in that: The material of the second reinforcing cloth is carbon fiber fabric impregnated with resin; when laying the second reinforcing cloth, a lightweight material with a fabric covering matching the shape of the connecting layer can be used for laying, wherein the lightweight material is high temperature resistant foam or glass beads.

7. The method for forming a rail-type composite pressure-resistant shell with a reinforced structure according to claim 6, characterized in that: The second reinforcing cloth is a fabric with a plain weave structure, a grid structure or a honeycomb structure.

8. The method for forming a rail-type composite pressure-resistant shell with a reinforced structure according to claim 7, characterized in that: Before winding the second fiber, an ellipsoidal head is used to limit the two ends of the core mold (2).

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