Forming die and forming method for cylinder with grid ribs

Abstract

The invention discloses a forming die and a forming method for a barrel with grid ribs, and belongs to the technical field of forming dies, the forming die comprises a male die assembly used for supporting the inner side of a barrel product and comprising a core barrel and a plurality of male die rings detachably connected with the core barrel; the two pressing rings are connected with the core cylinder; the female die assembly is used for supporting the outer side of the cylinder product and is formed by splicing a plurality of female die splicing blocks, the female die splicing blocks are detachably connected with the pressing ring, and a cavity for manufacturing the cylinder product is defined by the female die splicing blocks, the male die ring and the pressing ring; and the two supporting rotating shafts are used for transmitting rotating torque. The forming method comprises the steps that the core cylinder and the male die ring are installed at first, then materials are wound, and finally the female die splicing blocks are installed; heating, forming and cooling; the female die splicing blocks are dismantled firstly; and then the core cylinder is disassembled, and the male die splicing block is taken down. The difficulty of demolding the barrel product from the mold is effectively reduced, the material can be smoothly separated from the mold, and the original structure is kept, so that the quality of the product is improved, and the production requirement is met.

Description

Technical Field

[0001] The present application belongs to the technical field of forming dies, and in particular relates to a forming die and a forming method for a cylinder with grid ribs. Background Art

[0002] A cylinder with grid ribs refers to a structural product with grid-like ribs on the cylinder structure, such as a cylinder product with built-in grid ribs made of resin-based carbon fiber reinforced composite materials. The resin-based carbon fiber reinforced composite materials need to solidify the resin under certain temperature and pressure conditions, and the composite material product is obtained by demolding the mold. This is a commonly used molding method.

[0003] For the molding of large-size products, two methods are commonly used at present. One molding method is the hard mold method, which uses molds made of metal materials for molding. This method is suitable for composite products that are co-cured and molded using a high-temperature pressurized process system (resin curing temperature 180°C and above, curing pressure 0.4Mpa and above). Another molding method is the composite mold method, which fixes the silicone rubber soft film rib groove on a rigid hard mold (metal mold), and uses the hard mold to ensure the basic shape of the composite product. The silicone rubber soft film rib groove is used for fiber prepreg winding to form the grid rib.

[0004] The existing cylindrical structure with grid ribs, using the existing molds and methods, has problems with demoulding quality of the products: on the one hand, if the hard mold method is used, it is difficult to demould the cylindrical products, and even if demoulding is done, it is easy to cause structural damage; on the other hand, if a composite mold is used, the size of the cylindrical products is easy to deviate greatly from the design value in the rubber part of the mold. In this way, the demoulding quality of the cylindrical products does not meet the production requirements. Summary of the invention

[0005] The present application aims to at least to some extent solve the technical problem of demolding quality of a cylinder with grid ribs. To this end, the present application provides a molding mold and a molding method for a cylinder with grid ribs, which effectively reduce the difficulty of demolding the cylinder product from the mold, can smoothly separate the material from the mold, maintain the original structure, thereby improving the product quality and meeting production requirements.

[0006] In a first aspect, an embodiment of the present application provides a forming mold of a cylinder with grid ribs, which is used to manufacture a cylinder product, wherein the inner side of the cylinder product has intersecting annular ribs and longitudinal ribs, and the forming mold comprises:

[0007] The punch assembly includes a core barrel and a plurality of punch rings. The ends of the plurality of punch rings are sequentially spliced ​​to form a cylindrical structure for supporting the inner side of the cylindrical product. The cylindrical structure is attached to the outer wall of the core barrel. The punch ring is an annular structure formed by splicing a plurality of punch blocks along the circumferential direction. The plurality of punch blocks are detachably connected to the core barrel. The punch blocks are made of metal.

[0008] Two pressure rings are connected to the two ends of the core barrel respectively, and the pressure rings are made of metal material;

[0009] The die assembly is sleeved on the outer circumference of the cylindrical structure and is used for supporting the outer side of the cylindrical product. The die assembly is formed by splicing a plurality of die blocks along the circumference of the annular structure. The two ends of the die blocks are detachably connected to the corresponding pressure rings. The pressure rings are made of metal. The plurality of die blocks, the plurality of punch rings and the two pressure rings together form a cavity for manufacturing the cylindrical product.

[0010] Two supporting shafts are detachably connected to the two ends of the core barrel, respectively, and the supporting shafts are connected to the pressure ring sleeves. The supporting shafts are used to support the core barrel and transmit the rotation torque around the axis.

[0011] In an optional embodiment, the punch block is provided with at least one half annular groove, the half annular groove is located at the end of the punch block and is arranged circumferentially along the punch ring, and the half annular grooves of adjacent punch blocks are spliced ​​and combined into one annular groove; the annular grooves are arranged along both sides of the punch block to form intervals for manufacturing annular ribs.

[0012] In an optional embodiment, the number of the annular grooves is one and a half, wherein there is one annular groove (120b) located between the two ends of the male mold block.

[0013] In an optional embodiment, the punch block is further provided with longitudinal grooves, at least two of which are provided, and the longitudinal grooves are arranged along the two end directions of the punch block to form intervals for manufacturing longitudinal ribs.

[0014] In an optional embodiment, the joints of the punch segments of adjacent punch rings form an annular groove, or the joints are flush; the longitudinal grooves of the multiple punch segments corresponding to the same position of all the punch rings are located on the same straight line.

[0015] In an optional embodiment, the punch block includes a plurality of first punch blocks and a plurality of second punch blocks, and the plurality of first punch blocks and the plurality of second punch blocks are alternately spliced ​​to form an annular structure.

[0016] In an optional embodiment, acute-angled planes are provided on both sides of the first punch block, and an angle α is formed between the acute-angled planes and the outer wall of the core tube. Obtuse-angled planes are provided on both sides of the second punch block, and an angle β is formed between the obtuse-angled planes and the outer wall of the core tube, wherein α+β=180°.

[0017] In an optional embodiment, the core barrel includes a barrel body, a first barrel ring and a second barrel ring, the first barrel ring and the second barrel ring are respectively connected to the two ends of the barrel body, the barrel body and a plurality of punch rings are detachably connected, and the first barrel ring and the second barrel ring are respectively detachably connected to the corresponding pressure ring and the corresponding supporting shaft.

[0018] In an optional embodiment, the cylinder body, the first punch block, the second punch block, the first cylinder ring, the second cylinder ring, the pressure ring, the die block and the supporting shaft are respectively provided with positioning holes and positioning members, the positioning members match the corresponding positioning holes, the positioning members and the corresponding positioning holes are respectively used for positioning between the cylinder body and the first punch block and the second punch block, positioning between the first cylinder ring, the second cylinder ring and the corresponding pressure ring, positioning between the pressure ring and the die block, and positioning between the supporting shaft and the first cylinder ring and the second cylinder ring.

[0019] In an optional embodiment, the cylinder body, the first punch block, the second punch block, the first cylinder ring, the second cylinder ring, the pressure ring, the die block and the supporting shaft are respectively provided with connecting holes and connecting members, the connecting members are connected to the corresponding connecting holes, the connecting members and the corresponding connecting holes are respectively used for connecting the cylinder body with the first punch block and the second punch block, connecting the first cylinder ring, the second cylinder ring and the corresponding pressure ring, connecting the pressure ring and the die block, and connecting the supporting shaft with the first cylinder ring and the second cylinder ring.

[0020] In an optional embodiment, the die block is provided with die longitudinal reinforcement ribs and die annular reinforcement ribs in a cross-sectional and criss-cross manner.

[0021] In an optional embodiment, the supporting shaft includes a shaft, a flange, a positioning ring and a rib plate, the flange is connected to the shaft, the positioning ring is attached to the flange, and the rib plate is connected to the flange and the shaft.

[0022] In a second aspect, an embodiment of the present application provides a molding method, which uses the above-mentioned molding die of the cylinder with grid ribs, comprising:

[0023] First, install the core barrel and the punch ring, install the support shaft, then wrap the material of the barrel product around the outside of all the punch rings, install the pressure ring, and finally install the die block;

[0024] The forming mold is sent to the heating and pressurizing device, wrapped with vacuum film, vacuumed, heated and pressurized again, and the cylindrical product is formed and cooled;

[0025] First, remove the die block from the outside of the cylindrical product, and then remove the pressure ring and supporting shaft from both sides of the cylindrical product;

[0026] Then remove the core tube from the inner side of the cylindrical product, and then remove the punch piece from the inner side of the cylindrical product.

[0027] In an optional embodiment, when the male mold block is provided with an annular groove and a longitudinal groove, the specific steps before the cylindrical product is formed include:

[0028] First, multiple punch rings are installed on the core barrel, and then two supporting shafts are connected to the two ends of the core barrel;

[0029] Winding the material of the cylindrical product in the longitudinal groove and the annular groove respectively until the longitudinal groove and the annular groove are filled;

[0030] Compact the wound material by sucking glue and wrapping the skin around the outside of all the male mold rings;

[0031] Install pressure rings at both ends of the core tube and suck the glue to compact it;

[0032] Install the concave mold blocks to seal the material of the cylindrical product in the cavity;

[0033] Heat the forming mold until it is formed.

[0034] In an optional embodiment, the molding method is used for molding a resin-based fiber-reinforced composite material, and the material of the cylindrical product used is a resin-based fiber-reinforced composite material.

[0035] It can be seen from the above technical solution that the beneficial effects of this application are:

[0036] 1. The mold of the present application provides a mounting base for multiple convex mold rings through a core barrel, and a split structure that is easy to disassemble can be formed outside the core barrel by combining and splicing multiple convex mold rings, providing a mold profile on the inner side of the cylindrical product. The core barrel is used as a connection base for the supporting shaft, and the pressure ring is sleeved on the supporting shaft and connected to the core barrel. A concave mold assembly is formed by combining and splicing multiple concave mold blocks, which can provide a mold profile on the outer side of the cylindrical product. At the same time, since the convex mold block, the pressure ring and the concave mold block are made of metal material, the cavity of the cylindrical product is formed by the concave mold block, the convex mold block and the pressure ring. , which can have a strong constraint on the shape of the cylindrical product, so that it can be formed under process conditions, and the cylindrical product after forming can have the same size as the designed shape. Through the detachable connection of the male mold block and the female mold block, and the detachable pressure ring, a plurality of detachable structures are formed on the outside of the cylindrical product. After the cylindrical product is formed, the entire molding mold can be separated from the cylindrical product, which effectively reduces the difficulty of demolding the cylindrical product from the mold, and can smoothly separate the material from the mold, maintaining the original structure, thereby improving the product quality and meeting the production requirements.

[0037] 2. The method of the present application first removes the female mold block on the outside of the cylindrical product to expose the outside of the cylindrical product, and then removes the inner core tube of the cylindrical product. The remaining molds are all detachable structures, and the male mold blocks are only attached to the inner side of the cylindrical product. The force between the male mold blocks and the ribs of the cylindrical product is limited or non-existent. In this way, the male mold blocks can be removed, which effectively reduces the difficulty of demolding the cylindrical product from the mold and can smoothly separate the material from the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other embodiments and drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 A schematic diagram of an embodiment of a cylindrical product of the present invention is shown;

[0040] Figure 2 A schematic diagram of an embodiment of a forming die of the present invention is shown;

[0041] Figure 3 Shows Figure 2 A is an enlarged schematic diagram;

[0042] Figure 4 A schematic diagram of an embodiment of a pressure ring of the present invention is shown;

[0043] Figure 5 A partial cross-sectional view of an embodiment of a male mold assembly of the present invention is shown;

[0044] Figure 6 Shows Figure 5 A magnified schematic diagram of B;

[0045] Figure 7 A schematic diagram of an embodiment of a punch ring of the present invention is shown;

[0046] Figure 8 A schematic diagram of an embodiment of a punch ring of the present invention is shown;

[0047] Fig. 9 A schematic diagram of an embodiment of the first punch block of the present invention is shown;

[0048] Fig.10 A schematic diagram of an embodiment of the second punch block of the present invention is shown;

[0049] Fig.11 A schematic diagram of an embodiment of the first punch block of the present invention is shown;

[0050] Fig.12 A schematic diagram of an embodiment of the second punch block of the present invention is shown;

[0051] Fig.13 A schematic diagram of an embodiment of a core cartridge of the present invention is shown;

[0052] Fig.14 Shows Fig.13 A magnified schematic diagram of middle C;

[0053] Fig.15 A schematic diagram of an embodiment of a concave mold assembly of the present invention is shown;

[0054] Fig.16 A schematic diagram of an embodiment of a concave mold block of the present invention is shown;

[0055] Fig.17 A schematic diagram of an embodiment of a concave mold block of the present invention is shown;

[0056] Fig.18 A schematic diagram of an embodiment of the support shaft of the present invention is shown;

[0057] Fig.19 A schematic diagram of an embodiment of the support shaft of the present invention is shown;

[0058] Reference numerals: 100, punch assembly; 110, core barrel; 111, barrel body; 111a, side wall positioning hole; 111b, side wall connecting hole; 112, first barrel ring; 112a, barrel ring positioning hole; 112b, barrel ring connecting hole; 113, second barrel ring; 113a, inner circle hole; 113b, outer circle hole; 120, punch ring; 120a, longitudinal groove; 120b, annular groove; 121, first punch piece; 121a, acute angle inclined plane; 121b, punch positioning hole; 121c, punch connecting hole; 122, second punch piece; 122a, blunt Angular bevel plane; 200, pressure ring; 210, outer circle positioning hole; 220, outer circle connecting hole; 230, pressure ring positioning hole; 240, pressure ring connecting hole; 300, die assembly; 310, die piece; 311, die connecting hole; 312, die positioning hole; 320, die longitudinal reinforcement rib; 330, die annular reinforcement rib; 400, supporting shaft; 410, shaft; 420, flange; 421, flange positioning hole; 422, flange connecting hole; 430, rib plate; 440, positioning ring; 500, cylinder product; 510, annular rib; 520, longitudinal rib. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0063] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0064] Please refer to Figure 1 and Figure 2In the first embodiment of the present application, a molding die is provided for manufacturing a large-sized cylindrical product 500. The large-sized product refers to a cylindrical structural product with a length and a diameter greater than or equal to 1.5 m. The manufacturing material of the cylindrical product 500 is a resin-based carbon fiber reinforced composite material, and other materials that are easy to wind can also be used. The cylindrical product 500 is cylindrical, and has an annular rib 510 and a longitudinal rib 520 that cross each other on its inner side. The annular rib 510 and the longitudinal rib 520 can be arranged in a mutually perpendicular manner. The outer side of the cylindrical product 500 is a smooth surface. The demoulding problem mainly lies in the demoulding of the inner side of the cylindrical product 500. The molding die includes: a male mold assembly 100, two pressure rings 200, a female mold assembly 300 and two supporting shafts 400, wherein the male mold assembly 100, the pressure ring 200, the female mold assembly 300 and the supporting shafts 400 are all made of metal materials. During molding, the male mold assembly 100 is located on the inner side of the cylindrical product 500, the pressure ring 200 is located at both ends of the cylindrical product 500, the pressure ring 200 is in a circular shape, the female mold assembly 300 is located on the outer side of the cylindrical product 500, and the supporting shafts 400 are connected to the core barrel 110. The punch assembly 100 includes a core barrel 110 and a plurality of punch rings 120. The core barrel 110 is a hollow cylinder. The two pressure rings 200 are both ring-shaped and are respectively connected to the two ends of the core barrel 110. Corresponding holes are respectively set at the two ends of the pressure ring 200 and the core barrel 110. The pressure ring 200 and the core barrel 110 can be detachably connected by screws, bolts, etc. The two supporting shafts 400 are also provided with corresponding holes on the core barrel 110. The supporting shafts 400 and the core barrel 110 are detachably connected by screws, bolts, etc. The supporting shafts 400 are connected to the sleeves of the pressure ring 200. The supporting shafts 400 are used to support the core barrel 110 and transmit the rotational torque around the axis. The two supporting shafts 400 can be connected to a driving device, such as a winding machine, so that the die assembly 300 and the punch assembly 100 can be driven to rotate together through the supporting shafts 400.

[0065] Please refer to Figure 2 and Figure 3The core barrel 110 is in the shape of a cylinder. The core barrel 110 is a hollow annular cylinder. The outer side of the core barrel 110 is a cylindrical surface. A plurality of punch rings 120 are sleeved on the outer side of the core barrel 110. Each punch ring 120 is annular. The ends of the plurality of punch rings 120 are sequentially spliced ​​to form a cylindrical structure. That is, the plurality of punch rings 120 can be spliced ​​at the ends to form an integral structure. The punch ring 120 serves as an inner profile surface for supporting the inner side of the cylindrical product 500. That is, the outer side of the punch ring 120 is supported on the inner side of the cylindrical product 500 during molding. The cylindrical structure is attached to the outer wall of the core barrel 110 and is located at both ends of the core barrel 110. The two opposite outer end faces of the punch ring 120 are respectively set as circular step surfaces, and the circular step surfaces are used to form the two ends of the cylindrical product 500 in the molding process so that the cylindrical product 500 has two end frames. The punch ring 120 is an annular structure formed by splicing a plurality of punch blocks along the circumferential direction, that is, each punch ring 120 can be spliced ​​by a plurality of punch blocks, and the plurality of punch blocks are detachably connected to the core barrel 110. Specifically, holes are opened at corresponding positions of the punch ring 120 and the core barrel 110, and bolts or screws can be passed through the holes. The punch ring 120 and the core barrel 110 are detachably connected by bolts or screws. The female mold assembly 300 is sleeved on the outer periphery of the cylindrical structure, that is, the female mold assembly 300 is located on the outer side of the cylindrical product 500. The female mold assembly 300 serves as an outer profile for supporting the outer side of the cylindrical product 500. The female mold assembly 300 is formed by splicing a plurality of female mold pieces 310 along the circumferential direction of the annular structure. There is a cavity between the female mold piece 310 and the male mold piece, and the cylindrical product 500 fills the cavity. The two ends of the female mold piece 310 are detachably connected to the corresponding pressure ring 200, please refer to Figure 4 Holes are provided at both ends of the die block 310 and the pressure ring 200, and bolts or screws can be used to pass through the holes to connect the die block 310 and the pressure ring 200. A plurality of die blocks 310, a plurality of punch rings 120 and two pressure rings 200 together form a cavity for manufacturing the cylindrical product 500. The cylindrical product 500 can be formed using the cavity, is easy to demould, has good product quality consistency, and has higher product precision.

[0066] The mold of the prior art has the problem of demolding quality of the cylindrical product 500 during demolding, and the quality of the product after demolding does not meet the requirements. This is caused by the existing mold. On the one hand, the mold of the existing hard mold method has a different expansion coefficient from the material. Since the expansion coefficient of the product after curing is smaller than that of ordinary metal materials, the shrinkage of the product and the mold is different during the cooling stage after high-temperature curing, resulting in interaction forces between the multiple metal punch annular groove profiles and the multiple annular ribs of the product, making it difficult to demold the product. Even if demolding is performed, the annular ribs of the product are easily damaged; on the other hand, the mold of the existing composite mold method partially uses soft materials such as silicone rubber. Since silicone rubber has high elasticity, the restraint force of silicone rubber on the cylindrical product 500 is insufficient, and the longitudinal ribs and annular ribs of the molded product have large size deviations, resulting in the product quality not meeting the requirements, and silicone rubber has the problem of aging loss during repeated use.

[0067] The present application provides a mounting base for a plurality of punch rings 120 through a core barrel 110, and a plurality of punch rings 120 are combined and spliced ​​to form a split structure outside the core barrel 110 that is easy to disassemble, and a mold profile is provided on the inner side of the cylindrical product 500. The core barrel 110 is used as a connection base for the support shaft 400, and the pressure ring 200 is sleeved on the support shaft 400 and connected to the core barrel 110. A plurality of concave mold blocks 310 are combined and spliced ​​to form a concave mold assembly 300, and a mold profile can be provided on the outer side of the cylindrical product 500. At the same time, since the punch block, the pressure ring 200 and the concave mold block 310 are made of metal, the concave mold block 310, the punch block and the pressure ring 200 are The cavity forming the cylindrical product 500 can have a strong constraint on the shape of the cylindrical product 500, so that it can be molded under process conditions. The cylindrical product 500 after molding can have the same size as the designed shape. Through the detachable connection of the male mold block and the female mold block 310, and the detachable pressure ring 200, a plurality of detachable structures are formed on the outside of the cylindrical product 500. After the cylindrical product 500 is molded, the entire molding mold can be separated from the cylindrical product 500, which effectively reduces the difficulty of demolding the cylindrical product 500 from the mold, and can smoothly separate the material from the mold, maintaining the original structure, thereby improving the product quality and meeting the production requirements.

[0068] Please refer to Figure 5 , Figure 6 , Figure 7 and Figure 8In an optional embodiment, the punch block is provided with a longitudinal groove 120a and an annular groove 120b, and at least two longitudinal grooves 120a are provided, such as two or three, and the longitudinal grooves 120a are arranged along the two end directions of the punch block to form a spacing for manufacturing the longitudinal ribs 520; the annular groove 120b is provided with at least one and a half, such as one and a half, two and a half, three and a half, etc., and the preferred number is one and a half, and the half annular groove 120b is located at the end of the punch block and is arranged circumferentially along the punch ring 120, and the half annular grooves 120b of adjacent punch blocks are spliced ​​and combined into one annular groove 120b. With this design, when an expansion difference occurs between the punch block and the cylindrical product 500, the punch block The block can interact with the cylindrical product 500 and separate, thereby solving the axial interference problem between the multiple annular grooves 120b of the overall rigid mold and the multiple annular ribs 510 of the solidified cylindrical product 500; the annular grooves 120b are arranged along the two sides of the punch block to form the intervals for manufacturing the annular ribs. In different punch blocks, the annular grooves 120b can be arranged at different positions, and the above-mentioned number and position settings must be ensured; the longitudinal grooves 120a and the annular grooves 120b are both formed by the outer surface of the punch block, and the longitudinal grooves 120a and the annular grooves 120b are in a vertically crossed state. Since the punch block is arc-shaped along the direction of the annular grooves 120b, the annular grooves 120b are also arc-shaped. In an optional embodiment, the punch ring 120 includes a first punch ring 120, a second punch ring 120, a third punch ring 120 and a fourth punch ring 120, wherein the first punch ring 120 and the fourth punch ring 120 are respectively located at the two ends of the entire core tube 110, and the second punch ring 120 and the third punch ring 120 are located in the middle, so that a plurality of punch rings 120 are combined to form a punch assembly 100. In an optional embodiment, the butt joints of the punch pieces of adjacent punch rings 120 form an annular groove 120b, or the butt joints are flush, that is, in the axial direction of the cylindrical structure, in adjacent punch rings 120 of the plurality of punch rings 120, the positions of the punch pieces correspond to the adjacent punch pieces, and the butt joints of the adjacent punch pieces have half an annular groove 120b, and the adjacent punch pieces form an annular groove 120b together after butt jointing. There is also another butt jointing method, that is, the butt joints of the adjacent punch pieces are flush, and the two are seamless after butt jointing, so that in the plurality of punch rings 120, the punch pieces are connected to each other at the same time. After being spliced, the punch ring 120 can have multiple annular grooves 120b; wherein, the end faces of the punch blocks located at both ends of the punch ring 120 are respectively used for end frame forming of the cylindrical product 500; the longitudinal grooves 120a of multiple punch blocks corresponding to the same position of all punch rings 120 are located on the same straight line, and the positions of the punch blocks at different positions of the punch rings 120 are corresponding, and the positions of the longitudinal grooves 120a are corresponding, so that multiple longitudinal grooves 120a that are parallel to each other and extend to both ends of the core barrel 110 are formed on different punch rings 120.

[0069] Please refer to Fig. 9 and Fig.10 In an optional embodiment, the punch block includes a plurality of first punch blocks 121 and a plurality of second punch blocks 122, and the plurality of first punch blocks 121 and the plurality of second punch blocks 122 are alternately spliced ​​to form an annular structure, that is, at the same position of the punch ring 120, the first punch block 121 and the second punch block 122 are a group, and the plurality of groups are adjacently arranged around, and in the entire annular structure, the first punch block 121 and the second punch block 122 are alternately arranged, and the annular structure is the punch ring 120, and each punch ring 120 has the same structure and is formed by splicing the first punch block 121 and the second punch block 122, and the two ends of the first punch block 121 and the second punch block 122 are respectively the two ends of the punch assembly 100 or the docking points of adjacent punch rings 120, and the two sides of the first punch block 121 and the second punch block 122 are respectively used as the splicing points for alternating splicing. In an optional embodiment, acute angled planes 121a are provided on both sides of the first punch block 121, and an angle α is formed between the acute angled planes 121a and the outer wall of the core tube 110. Obtuse angled planes 122a are provided on both sides of the second punch block 122, and an angle β is formed between the obtuse angled planes 122a and the outer wall of the core tube 110, wherein α+β=180°. In the above manner, the first punch block 121 and the second punch block 122 can be seamlessly spliced ​​after splicing, so that the punch ring 120 formed by splicing multiple first punch blocks 121 and second punch blocks 122 is a perfect circular ring. At the same time, at the grid ribs of the cylindrical product 500, the first punch block 121 and the second punch block 122 are used as the inner profile of the cylindrical product 500, which is convenient for disassembly, and at the same time, the soft mold is not used, which also avoids the problem of soft mold loss.

[0070] Please refer to Fig.11 and Fig.12The first punch block 121 and the second punch block 122 have six faces as a whole. The outer side faces and the inner side faces of the first punch block 121 and the second punch block 122 are both arc faces. The outer side faces are used to support the inner wall of the cylindrical product 500, and the inner side faces are supported by the outer wall of the core tube 110. The longitudinal groove 120a and the annular groove 120b are both formed by concave arrangement of the outer side faces of the first punch block 121 and the second punch block 122. The longitudinal groove 120a extends from one end of the first punch block 121 and the second punch block 122 to the other end. The annular groove 120b is formed by the outer side faces of the first punch block 121 and the second punch block 122. The outer sides of the first punch block 121 and the second punch block 122 are arranged along the circumferential direction of the punch ring 120. On the same punch ring 120, multiple first punch blocks 121 and multiple second punch blocks 122 are spliced ​​to form an annular structure, and each annular groove 120b is located on the same circumference; the end face of one end of the first punch block 121 and the second punch block 122 is half of the annular groove 120b, or is a flush surface, so that along the two end directions of the core tube 110, the adjacent first punch blocks 121 or the adjacent second punch blocks 122 form a partial section of an annular groove 120b at the end, or are seamlessly spliced.

[0071] Please refer to Fig.13In an optional embodiment, the core barrel 110 includes a barrel body 111, a first barrel ring 112 and a second barrel ring 113, the first barrel ring 112 and the second barrel ring 113 are respectively connected to the two ends of the barrel body 111, the barrel body 111 and the plurality of punch rings 120 are detachably connected, the first barrel ring 112 and the second barrel ring 113 are respectively detachably connected to the corresponding pressure ring 200 and the supporting shaft 400; the barrel body 111 is in a hollow cylindrical shape, and its outer side and inner side are both cylindrical surfaces, the first barrel ring 112 and the second barrel ring 113 are respectively located at the two ends of the barrel body 111, the first barrel ring 112 and the second barrel ring 113 are respectively located at the two ends of the barrel body 111, The outer diameter of the ring 113 is equal to the outer diameter of the cylinder 111, the inner diameters of the first cylinder ring 112 and the second cylinder ring 113 are smaller than the inner diameter of the cylinder 111, the cylinder 111, the first cylinder ring 112 and the second cylinder ring 113 are an integrally formed structure, the first cylinder ring 112 and the second cylinder ring 113 are provided to facilitate the disassembly and connection with the pressure ring 200 and the supporting shaft 400, the first cylinder ring 112 and the second cylinder ring 113 are respectively disassembly and connected with the corresponding pressure ring 200 and the supporting shaft 400, and the corresponding components are connected by positioning parts, such as pins, screws or bolts for detachable connection. The first tube ring 112 and the second tube ring 113 are each provided with two circles of holes distributed along the circumference, and the two circles of holes include positioning holes and connecting holes. The inner circle hole 113a is close to the inner side of the ring, and the outer circle hole 113b is close to the outer side of the ring. The inner circle hole 113a corresponds to positioning and connecting the supporting shaft, such as positioning at the flange positioning hole 421 and connecting flange connecting hole 422, and the outer circle hole 113b corresponds to positioning and connecting the pressing ring, such as positioning at the pressing ring positioning hole 230 and connecting to the pressing ring connecting hole 240. The supporting shaft 400 and the pressing ring 200 can be positioned and fixed at the same time by the first tube ring 112 and the second tube ring 113.

[0072] Please refer to Fig. 9 , Fig.10 and Fig.14In an optional embodiment, the cylinder body 111, the first punch block 121, the second punch block 122, the first cylinder ring 112, the second cylinder ring 113, the pressure ring 200, the die block 310 and the supporting shaft are respectively provided with positioning members, positioning holes, connecting members and connecting holes. The positioning members match the corresponding positioning holes. The positioning holes are used to insert the positioning members. The connecting members are inserted into the corresponding connecting holes to achieve detachable connection. The connecting members can use bolts to achieve detachable connection at the above-mentioned locations through bolts. The positioning hole and the connecting hole are used for positioning and connecting the cylinder 111 with the first punch block 121 and the second punch block 122 respectively. The positioning hole of the cylinder 111 corresponds to the positioning holes of the first punch block 121 and the second punch block 122. After the positioning piece is inserted, the bolts are inserted into the corresponding connecting holes to fix the first punch block 121 and the second punch block 122 outside the cylinder 111; the positioning hole and the connecting hole are used for positioning and connecting the first cylinder ring 112, the second cylinder ring 113 and the corresponding pressure ring 200 respectively. The positioning holes of the first cylinder ring 112 and the second cylinder ring 113 correspond to the positioning holes of the corresponding pressure ring 200. After the positioning piece is inserted, the bolts are inserted into the corresponding connecting holes to fix the first punch block 121 and the second punch block 122 outside the cylinder 111. The corresponding connecting holes are used to connect the first tube ring 112 with the pressure ring 200 and the second tube ring 113 with the pressure ring 200; the positioning hole and the connecting hole are respectively used for positioning and connecting the pressure ring 200 with the die block 310, and the positioning holes of the two pressure rings 200 correspond to the positioning holes at both ends of the die block 310 respectively. After inserting the positioning parts, the bolts are inserted into the corresponding connecting holes to connect the two pressure rings 200 with the two ends of the die block 310 respectively; the positioning holes and the connecting holes are also used for positioning and connecting the supporting shaft 400 and the first tube ring 112 and the second tube ring 113 respectively. The supporting shaft is connected to the first tube ring or the second tube ring through the positioning parts, and then the bolts are connected accordingly. Among some of the above-mentioned connecting holes, the connecting holes of the first punch block 121, the second punch block 122 and the cylinder 111 are set as waist-shaped holes. The design of waist-shaped holes allows each component to have a certain relative adjustment range, which is convenient for adjusting the adaptation production of the mold and the cylinder product 500; while in the other part of the connecting holes, the punch connecting hole 121c, the outer circle connecting hole 220 of the pressure ring 200, and the cylinder ring connecting hole 112b are all threaded holes for connecting screws (bolts).

[0073] Please refer to Fig. 9 , Fig.10 and Fig.14The above-mentioned positioning holes and connecting holes are specifically arranged as follows: the cylinder 111 is provided with a side wall positioning hole 111a for positioning and a side wall connecting hole 111b for connecting, the first punch assembly 121 and the second punch assembly 122 are respectively provided with a punch positioning hole 121b and a punch connecting hole 121c, the punch positioning hole 121b corresponds to the side wall positioning hole 111a, and the punch connecting hole 121c corresponds to the side wall connecting hole 111b, wherein the side wall positioning hole 111a and the side wall connecting hole 111b are adjacent to each other and are recorded as a group, and a plurality of groups of side wall positioning holes 111a and side wall connecting holes 111b are arranged along the circumference of the cylinder 111, such as 8 groups forming a circle, and a plurality of circles are arranged at intervals along the two end directions of the cylinder 111. On the first tube ring 112 and the second tube ring 113, the inner circle hole 113a and the outer circle hole 113b both include two types of holes: a tube ring positioning hole 112a and a tube ring connecting hole 112b, that is, the above two types of holes are provided on the inner side and the outer side of the ring close to the first tube ring 112 and the second tube ring 113, and the pressure ring 200 is provided with a pressure ring positioning hole 230 and a pressure ring connecting hole 240 running through both sides; the tube ring positioning hole 112a located on the outer side of the ring corresponds to the pressure ring positioning hole 230, the tube ring positioning hole 112a corresponding to each pressure ring 200 is set to 2, and the tube ring connecting hole 112b corresponds to the pressure ring connecting hole 240; the tube ring positioning hole 112a located on the inner side of the ring corresponds to the flange positioning hole 421, the tube ring positioning hole 112a corresponding to each supporting shaft 400 is also set to 2, and the tube ring connecting hole 112b located on the inner side of the ring corresponds to the flange connecting hole 422. The pressure ring 200 is also provided with a radial outer circle positioning hole 210 and an outer circle connecting hole 220, and both ends of the die block 310 are provided with a die connecting hole 311 and a die positioning hole 312. The two ends of each die block 310 are arranged the same, and the two die connecting holes 311 are located on both sides of the die positioning hole 312. The die positioning hole 312 corresponds to the outer circle positioning hole 210, and the die connecting hole 311 corresponds to the outer circle connecting hole 220. The pressure ring 200 is provided with corresponding pressure ring positioning holes 230 and pressure ring connecting holes 240, which are respectively arranged as a pair. The outer circle positioning holes 210 and the outer circle connecting holes 220 surround the pressure ring 200, and a plurality of groups are provided. The outer circle positioning holes 210 and the outer circle connecting holes 220 of each group correspond to the die positioning holes 312 and the die connecting holes 311 at the end of the die block 310, respectively.

[0074] Please refer to Fig.15 , Fig.16 and Fig.17In an optional embodiment, the die block 310 is provided with a die longitudinal reinforcement rib 320 and a die annular reinforcement rib 330 on the outer side surface in a cross-sectional and longitudinal direction. The die block 310 is provided with a plurality of die blocks, and the two sides of the plurality of die blocks 310 are sequentially adjacently spliced ​​to form a ring. The number of the die blocks 310 is greater than or equal to 4. The die block 310 has a total of six faces, which are arc-shaped. The outer side surface and the inner side surface of the die block 310 are both arc-shaped faces. There are die longitudinal reinforcement ribs 320 and die annular reinforcement ribs 330, the inner side surfaces of which are smooth. The inner side surface of the die assembly 310 is used to fit closely to the outer surface of the cylindrical product 500. The die longitudinal reinforcement ribs 320 are arranged along the two end directions of the die assembly 310, and the die annular reinforcement ribs 330 are arranged along the arc surface. The die longitudinal reinforcement ribs 320 are perpendicular to the die annular reinforcement ribs 330. By setting the above reinforcement ribs, the structural strength of the die assembly 300 can be improved.

[0075] Please refer to Figure 3 , Fig.18 and Fig.19 In an optional embodiment, the support shaft 400 includes a shaft 410, a flange 420, a positioning ring 440 and a rib plate 430. The flange 420 is connected to the shaft 410, the positioning ring 440 is attached to the flange 420, the positioning ring 440 forms a circular step surface on the side of the flange 420, the rib plate 430 is connected to the flange 420 and the shaft 410, the flange 420 has a hollow hole, and the shaft 410, the flange 420, the positioning ring 440 and the rib plate 430 can be fixed by welding; one end of the shaft 410 is connected to the middle of the flange 420, and the other end of the shaft 410 is used to connect the drive Device, the positioning ring 440 is protruded from the surface of the flange 420, and is located on both sides of the flange 420 with the rotating shaft 410 respectively, the rib plate 430 is arranged on the side of the flange 420 facing the rotating shaft 410, one side of the rib plate 430 is vertically connected to the flange 420, and the other side of the rib plate 430 is vertically connected to the outer side of the rotating shaft 410; when the above-mentioned flange 420 is connected to the pressure ring 200, it is arranged on the inner side of the pressure ring 200 through a shaft sleeve connection method, the outer diameter of the flange 420 matches the inner diameter of the pressure ring 200, and the positioning ring 440 is arranged on the annular inner side of the first tube ring 112 and the second tube ring 113 through a shaft sleeve connection method. A plurality of flange positioning holes 421 and flange connecting holes 422 are arranged at intervals and surrounding the outer side of the positioning ring 440 on the flange plate 420. The positioning holes and connecting holes also adopt the above-mentioned positioning holes and connecting holes, wherein the flange positioning hole 421 corresponds to the barrel ring positioning hole 112a belonging to the inner circle hole 113a, and the flange connecting hole 422 corresponds to the barrel ring connecting hole 112b belonging to the inner circle hole 113a. The second barrel ring 113 is also arranged in the same way. It is first positioned through the positioning holes, and then the support shaft 400 is connected to the first barrel ring 112 and the second barrel ring 113 at both ends by using bolts passing through the corresponding connecting holes.

[0076] In an optional embodiment, the above-mentioned male mold block, pressure ring 200 and female mold block 310 are all made of ordinary carbon steel, and the supporting shaft 400 can also be made of ordinary carbon steel. The above-mentioned materials can also be made of hard metal alloys. If hard metal alloys are made of alloy steel, there is a wide range of choices, and the manufacturing cost of the mold can be effectively reduced by selecting low-cost materials. The entire mold has strong structural strength and is not easy to deform. During the molding of the cylindrical product 500, it can provide strong supporting force on the outside of the cylindrical product 500, thereby maintaining the structure of the cylindrical product 500.

[0077] Please refer to Figure 2 The second embodiment of the present application provides a molding method, which uses the above-mentioned molding die to manufacture a cylindrical product 500. The molding method is used for molding a resin-based fiber-reinforced composite material. The material of the cylindrical product used is a resin-based fiber-reinforced composite material, such as a resin-based carbon fiber-reinforced composite material. The molding method includes:

[0078] First, install the core barrel 110 and the punch ring 120 to assemble the punch assembly 100. Specifically, install multiple punch rings 120 on the core barrel 110. The installation of each punch ring 120 is achieved by connecting the first punch block 121, the second punch block 122 and the cylinder body 111. Then, connect the two supporting shafts 400 to the two ends of the core barrel 110 and fix them with screws or bolts. Then, the two supporting shafts 400 of the mold are clamped by the winding machine respectively, the mold is supported horizontally, and then the material of the cylindrical product 500 is wound on the outside of all the punch rings 120, and the material of the cylindrical product 500 is wound and filled in the longitudinal grooves 120a and the annular grooves 120b respectively, such as winding carbon fiber prepreg, first winding each longitudinal groove 120a in turn, and then winding each annular groove 120b, which is a winding cycle. During the winding process, the carbon fiber prepreg is folded at both ends of the punch assembly 100, and then evenly spread out and adhered to the two end surfaces of the punch assembly 100, until the longitudinal grooves 120a and the annular grooves 120b are full of carbon fiber prepreg, and the two ends are folded to the end surface of the punch ring 120.

[0079] The wound carbon fiber prepreg is then subjected to glue suction and compaction treatment. After the treatment, the carbon fiber prepreg skin is wound on the surface of the material and the male mold assembly 100 until the skin thickness reaches the required level. The carbon fiber skin is folded at both ends of the male mold assembly 100 and attached to the left and right ends of the male mold assembly 100. Then, the pressure ring 200 is installed at both ends of the core barrel 110 and glue suction and compaction is performed. Finally, the female mold assembly 310 is installed, and the two ends of multiple female mold assembly 310 are connected to the corresponding pressure ring 200, so that the manufactured material is enclosed inside the female mold assembly 300.

[0080] The male mold block is positioned by the positioning pin and the cylinder ring during the winding stage, and connected by screws (bolts). However, before vacuum packaging, the positioning pin needs to be removed, while the screw (bolt) connection is still retained. Only in this way can the male mold block be pushed apart axially through the multiple annular ribs of the cylinder during the cooling stage after solidification. After the winding is completed, the positioning pins between each first male mold block 121, the second male mold block 122 and the core cylinder 110 are removed, while the connecting bolts remain connected.

[0081] The forming mold is sent to a processing device, such as an autoclave, wrapped with a vacuum film, vacuumed, heated and pressurized. Specifically, the mold wrapped with the material is sent to the autoclave, and the whole set of molds is wrapped with a vacuum bag with a vacuum nozzle. The vacuum nozzle on the vacuum bag is connected to the vacuum nozzle of the autoclave to vacuumize, and the product is heated and pressurized in the autoclave according to the process system to solidify the product until it is formed. After the cylindrical product 500 is formed and cooled, the product is cooled to room temperature in the autoclave together with the mold after solidification.

[0082] The mold is wound from a horizontal state, put into an autoclave, and solidified. The mold is supported in a horizontal state by the support shafts 400 at both ends, and then flipped to a vertical state. First, the die block 310 is removed from the outside of the cylindrical product 500, and the bolts are removed. The die block 310 is removed from the outside, and then the pressure ring 200 and the support shaft 400 are removed from both sides of the cylindrical product 500. The bolts are also removed first, and then the pressure ring 200 and the support shaft 400 are removed.

[0083] Then, the core barrel 110 is removed from the inner side of the cylindrical product 500. First, the connection between the core barrel 110 and each punch block is removed, the core barrel 110 is pulled upward, and then the punch block is removed from the inner side of the cylindrical product 500. Due to the difference in expansion coefficients of the materials of the cylindrical product 500 and the mold, in the radial direction, each punch block can shrink and separate from the inner side of the cylindrical product 500. In the axial direction, the axial length of the cylindrical product 500 will be greater than the axial length of the punch block. Therefore, the multiple annular ribs 510 of the cylindrical product 500 can be used to separate the adjacent punch blocks spliced ​​to form the annular grooves 120b in the axial direction, and then the punch block can be smoothly removed, thereby avoiding interference between the multiple annular ribs 510 of the cylindrical product 500 and the multiple annular grooves 120b of the integral rigid punch assembly 100, which would cause difficulty in demolding or damage.

[0084] The molding method of the prior art has the problem of difficulty in demolding the cylindrical product 500. The prior art uses a hard mold method to mold the cylindrical product 500. After the product is cooled, it is difficult to separate the cylindrical product 500 from the mold. This is because the expansion coefficient of the cylindrical product 500 is different from that of the material. Since the expansion coefficient of the product after solidification is smaller than that of ordinary metal materials, the product and the mold shrink differently during the cooling stage after high-temperature solidification, resulting in an interaction force between the groove profile of the annular groove 120b of the metal punch and the multiple annular ribs 510 of the product, making it difficult to demold the product. In the present application, the outer side of the cylindrical product 500 can be exposed by first removing the female mold piece 310 from the outer side of the cylindrical product 500, and the inner core tube 110 of the cylindrical product 500 is removed, and the remaining molds are all detachable structures, and the male mold piece is only attached to the inner side of the cylindrical product 500. The force between the male mold piece and the ribs of the cylindrical product 500 is limited, or there is no force, so the male mold piece can be removed, which effectively reduces the difficulty of demolding the cylindrical product 500 from the mold, and the material can be separated from the mold smoothly. At the same time, the above-mentioned molding method can simplify the molding process of the cylindrical product 500, and the cylindrical product 500 can be molded into a cylindrical product 500 at one time using the mold.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", "optional example" or "optional implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0086] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0087] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A forming die for a cylindrical body with grid ribs, used for manufacturing a cylindrical body product (500), characterized in that: The inner side of the cylindrical product (500) is provided with annular ribs (510) and longitudinal ribs (520) intersecting each other, and the molding die comprises: A punch assembly (100) comprises a core barrel (110) and a plurality of punch rings (120), the ends of the plurality of punch rings (120) being spliced ​​in sequence to form a cylindrical structure for supporting the inner side of a cylindrical product (500), the cylindrical structure being arranged on the outer wall of the core barrel (110), the punch ring (120) being an annular structure formed by splicing a plurality of punch blocks along the circumferential direction, the plurality of punch blocks being detachably connected to the core barrel (110), and the punch blocks being made of metal; Two pressure rings (200) are respectively connected to two ends of the core barrel (110), and the pressure rings (200) are made of metal material; A female mold assembly (300) is sleeved on the outer circumference of the cylindrical structure and is used for supporting the outer side of the cylindrical product (500). The female mold assembly (300) is formed by splicing a plurality of female mold pieces (310) along the circumference of the annular structure. The two ends of the female mold pieces (310) are detachably connected to the corresponding pressure rings (200). The pressure rings (200) are made of metal. The plurality of female mold pieces (310), the plurality of male mold rings (120) and the two pressure rings (200) together form a cavity for manufacturing the cylindrical product (500). Two supporting shafts (400) are detachably connected to the two ends of the core barrel (110), and the supporting shafts (400) are connected to the sleeves of the pressure ring (200). The supporting shafts (400) are used to support the core barrel (110) and transmit the rotational torque around the axis.

2. The forming die of the cylinder with grid ribs according to claim 1, characterized in that: The punch block is provided with at least one and a half annular groove (120b), wherein the half annular groove (120b) is located at the end of the punch block and is arranged circumferentially along the punch ring (120), and the halves of the annular grooves (120b) of adjacent punch blocks are spliced ​​and combined into one annular groove (120b); the annular groove (120b) is arranged along both sides of the punch block to form a spacing for manufacturing the annular rib (510).

3. The forming die of the cylinder with grid ribs according to claim 2, characterized in that: The number of the annular grooves (120b) is one and a half, wherein one annular groove (120b) is located between the two ends of the male mold block.

4. The forming die of the cylinder with grid ribs according to claim 2, characterized in that: The punch block is also provided with a longitudinal groove (120a), and at least two longitudinal grooves (120a) are provided. The longitudinal grooves (120a) are arranged along the two end directions of the punch block and are used to form intervals for manufacturing the longitudinal ribs (520).

5. The forming die of the cylinder with grid ribs according to claim 4, characterized in that: The butt joints of the punch segments of adjacent punch rings (120) form an annular groove (120b), or the butt joints are flush; the longitudinal grooves (120a) of the plurality of punch segments corresponding to the same position of all the punch rings (120) are located on the same straight line.

6. The forming die of the cylinder with grid ribs according to any one of claims 1 to 5, characterized in that: The punch blocks include a plurality of first punch blocks (121) and a plurality of second punch blocks (122), and the plurality of first punch blocks (121) and the plurality of second punch blocks (122) are alternately spliced ​​to form the annular structure.

7. The forming die of the cylinder with grid ribs according to claim 6, characterized in that: The first punch block (121) is provided with acute angled planes (121a) on both sides, and an angle α is formed between the acute angled planes (121a) and the outer wall of the core tube (110); the second punch block (122) is provided with obtuse angled planes (122a) on both sides, and an angle β is formed between the obtuse angled planes (122a) and the outer wall of the core tube (110), wherein α+β=180°.

8. The forming die of the cylinder with grid ribs according to claim 6, characterized in that: The core barrel (110) comprises a barrel body (111), a first barrel ring (112) and a second barrel ring (113); the first barrel ring (112) and the second barrel ring (113) are respectively connected to two ends of the barrel body (111); the barrel body (111) and a plurality of punch rings (120) are detachably connected; the first barrel ring (112) and the second barrel ring (113) are respectively detachably connected to the corresponding pressure ring (200) and the corresponding support shaft (400).

9. The forming die of the cylinder with grid ribs according to claim 8, characterized in that: The cylinder body (111), the first punch block (121), the second punch block (122), the first cylinder ring (112), the second cylinder ring (113), the pressure ring (200), the die block (310) and the supporting shaft (400) are respectively provided with positioning holes and positioning members, the positioning members are matched with the corresponding positioning holes, and the positioning members and the corresponding positioning holes are respectively used for positioning between the cylinder body (111) and the first punch block (121), the second punch block (122), positioning between the first cylinder ring (112), the second cylinder ring (113) and the corresponding pressure ring (200), positioning between the pressure ring (200) and the die block (310), and positioning between the supporting shaft (400) and the first cylinder ring (112), the second cylinder ring (113).

10. The forming die of the cylinder with grid ribs according to claim 8, characterized in that: The cylinder body (111), the first punch block (121), the second punch block (122), the first cylinder ring (112), the second cylinder ring (113), the pressure ring (200), the die block (310) and the supporting shaft (400) are respectively provided with connecting holes and connecting members, the connecting members are connected with the corresponding connecting holes, the connecting members and the corresponding connecting holes are respectively used for connecting the cylinder body (111) with the first punch block (121), the second punch block (122), connecting the first cylinder ring (112), the second cylinder ring (113) and the corresponding pressure ring (200), connecting the pressure ring (200) with the die block (310), and connecting the supporting shaft (400) with the first cylinder ring (112), the second cylinder ring (113).

11. The forming die of the cylinder with grid ribs according to claim 1, characterized in that: The die block (310) is provided with die longitudinal reinforcing ribs (320) and die annular reinforcing ribs (330) in a cross-sectional and longitudinal manner.

12. The forming die of the cylinder with grid ribs according to claim 1, characterized in that: The supporting rotating shaft (400) comprises a rotating shaft (410), a flange (420), a positioning ring (440) and a rib plate (430), wherein the flange (420) is connected to the rotating shaft (410), the positioning ring (440) is attached to the flange (420), and the rib plate (430) is connected to the flange (420) and the rotating shaft (410).

13. A molding method, characterized in that: The forming die of the cylinder with grid ribs according to any one of claims 1 to 11 comprises: First, the core barrel (110) and the punch ring (120) are installed, the support shaft (400) is installed, and then the material of the cylindrical product (500) is wound around the outside of all the punch rings (120), the pressure ring (200) is installed, and finally the die block (310) is installed; The forming mold is sent to a heating and pressurizing device, wrapped with a vacuum film, evacuated, heated and pressurized again, and the cylindrical product (500) is formed and cooled; First, the female mold block (310) is removed from the outside of the cylindrical product (500), and then the pressure ring (200) and the supporting shaft (400) are removed from both sides of the cylindrical product (500); Then, the core tube (110) is removed from the inner side of the cylindrical product (500), and then the male mold piece is removed from the inner side of the cylindrical product (500).

14. The molding method according to claim 13, characterized in that: When the male mold block is provided with an annular groove (120b) and a longitudinal groove (120a), the specific steps before forming the cylindrical product (500) include: Firstly, a plurality of the male die rings (120) are installed on the core barrel (110), and then two of the supporting shafts (400) are connected to the two ends of the core barrel (110); Winding the material of the cylindrical product (500) in the longitudinal groove (120a) and the annular groove (120b) respectively until the longitudinal groove (120a) and the annular groove (120b) are fully filled; Compacting the wound material by absorbing glue, and wrapping the skin around the outside of all the male mold rings (120); The pressure rings (200) are installed at both ends of the core tube (110), and the glue is sucked and compacted; The female mold block (310) is installed to seal the material of the cylindrical product (500) in the mold cavity; The molding die is heated until molding.

15. The molding method according to claim 13, characterized in that: The molding method is used for molding resin-based fiber-reinforced composite materials, and the material of the cylindrical product (500) used is a resin-based fiber-reinforced composite material.

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