Forming die and forming method for a tubular body with lattice ribs

Abstract

The application discloses a forming die and a forming method of a cylinder with a grid rib, and belongs to the technical field of forming dies. The forming die comprises a punch assembly for supporting the inner side of a cylinder product, a plurality of punch rings being detachably connected with a core cylinder; two compression rings connected with the core cylinder; a die assembly for supporting the outer side of the cylinder product, the die assembly being formed by a plurality of die blocks being spliced, the die blocks being detachably connected with the compression rings, the die blocks, the punch rings and the compression rings forming a cavity for manufacturing the cylinder product; and two support shafts for transmitting rotary torque. The forming method comprises the following steps: firstly, installing the core cylinder and the punch rings, then winding the material, and finally installing the die blocks; heating, forming and cooling; firstly, removing the die blocks; then, removing the core cylinder, and finally, taking down the punch rings. The application effectively reduces the difficulty of demolding the cylinder product from the die, can smoothly separate the material from the die, maintains the original structure, and thus improves the product quality and meets the production requirements.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of forming molds, and particularly relates to a forming mold and a forming method for a cylinder body with grid ribs. BACKGROUND

[0002] The cylinder body with grid ribs refers to a structure product with grid-shaped ribs on the cylinder structure, such as an inner grid rib cylinder product made of resin-based carbon fiber reinforced composite material. The resin-based carbon fiber reinforced composite material needs to be cured under certain temperature and pressure conditions, and the composite material product is obtained by demolding through a mold, which is a commonly used forming method.

[0003] For large-size product forming, two methods are commonly used at present. One forming method is a hard mold method, which uses a mold made of metal material for forming. This method is suitable for composite material products that are co-cured and formed by using a high-temperature and high-pressure process system (resin curing temperature of 180 DEG C and above, and curing pressure of 0.4 Mpa and above). The other forming method is a composite mold method, which fixes a silicone rubber soft film rib groove on a rigid hard mold (metal mold). The hard mold ensures the basic shape of the composite material product, and the silicone rubber soft film rib groove is used for fiber pre-impregnated yarn winding forming grid ribs.

[0004] The existing cylinder body with grid ribs adopts the existing mold and method, and the product has demolding quality problems. On the one hand, if the hard mold method is used, the cylinder product is difficult to demold, and even if it is demolded, the structure is easily damaged. On the other hand, if the composite mold is used, the size of the cylinder product in the rubber part of the mold is easy to deviate from the design value. In this way, the demolding quality of the cylinder product does not meet the production requirements. SUMMARY

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

[0006] In a first aspect, the application provides a forming mold for a cylinder body with grid ribs, which is used for manufacturing a cylinder product. The inner side of the cylinder product is provided with annular ribs and longitudinal ribs that intersect with each other. The forming mold comprises:

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

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

[0009] A concave die assembly is sleeved on the outer periphery of the cylindrical structure and is used for supporting the outer side of the barrel product. The concave die assembly is formed by a plurality of concave die blocks spliced along the circumferential direction of the annular structure. The two ends of the concave die block are respectively detachably connected with the corresponding compression ring. The compression ring is made of metal material. The plurality of concave die blocks, the plurality of convex die rings and the two compression rings jointly form a cavity for manufacturing the barrel product.

[0010] Two support shafts are respectively detachably connected to the two ends of the core barrel. The support shafts are connected with the compression ring shaft sleeves. The support shafts are used for supporting the core barrel and transmitting the rotational torque around the shaft.

[0011] In an optional embodiment, the convex die block is provided with at least one half of the annular groove. The half of the annular groove is located at the end of the convex die block and is arranged along the annular direction of the convex die ring. The half of the annular groove of the adjacent convex die blocks is spliced and combined into one annular groove. The annular groove is arranged along the two side directions of the convex die block and is used for forming the interval for manufacturing the annular rib.

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

[0013] In an optional embodiment, the convex die block is further provided with a longitudinal groove. The longitudinal groove is provided with at least two. The longitudinal groove is arranged along the two end directions of the convex die block and is used for forming the interval for manufacturing the longitudinal rib.

[0014] In an optional embodiment, the butt joint of the convex die blocks of the adjacent convex die rings forms an annular groove, or the butt joint is flush. The longitudinal grooves of the plurality of convex die blocks corresponding to the same position of all the convex die rings are located on the same straight line.

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

[0016] In an optional embodiment, the two sides of the first convex die block are provided with an acute angle inclined plane. The acute angle inclined plane forms an angle α with the outer wall of the core barrel. The two sides of the second convex die block are provided with an obtuse angle inclined plane. The obtuse angle inclined plane forms an angle β with the outer wall of the core barrel, 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 is detachably connected with the plurality of convex die rings. The first barrel ring and the second barrel ring are respectively detachably connected with the corresponding compression ring and the corresponding support shaft.

[0018] In an optional embodiment, the cylinder body, the first punch assembly, the second punch assembly, the first cylindrical ring, the second cylindrical ring, the pressure ring, the die assembly, and the support shaft are each provided with positioning holes and positioning elements. The positioning elements match the corresponding positioning holes. The positioning elements and the corresponding positioning holes are used for positioning between the cylinder body and the first punch assembly, the second punch assembly, the first cylindrical ring, the second cylindrical ring and the corresponding pressure ring, the pressure ring and the die assembly, and the support shaft and the first cylindrical ring, the second cylindrical ring.

[0019] In an optional embodiment, the cylinder, the first punch assembly, the second punch assembly, the first cylindrical ring, the second cylindrical ring, the pressure ring, the die assembly, and the support shaft are each provided with connecting holes and connecting parts. The connecting parts are connected to the corresponding connecting holes. The connecting parts and the corresponding connecting holes are respectively used for connecting the cylinder with the first punch assembly and the second punch assembly, connecting the first cylindrical ring, the second cylindrical ring and the corresponding pressure ring, connecting the pressure ring with the die assembly, and connecting the support shaft with the first cylindrical ring and the second cylindrical ring.

[0020] In an optional embodiment, the die block is provided with longitudinal reinforcing ribs and circumferential reinforcing ribs.

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

[0022] Secondly, embodiments of this application provide a molding method, which employs the aforementioned molding die for a mesh-ribbed cylinder, comprising:

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

[0024] The molding die is sent into a heating and pressurizing device, a vacuum film is wrapped around it, a vacuum is drawn, and then it is heated and pressurized until the cylindrical product is formed and cooled.

[0025] First, remove the concave mold assembly from the outside of the cylindrical product, and then remove the pressure ring and support shaft from both sides of the cylindrical product.

[0026] Then, remove the core cylinder from the inside of the cylindrical product, and then remove the punch assembly from the inside of the cylindrical product.

[0027] In an optional embodiment, when the punch block is provided with circumferential grooves and longitudinal grooves, the specific steps before forming the cylindrical product include:

[0028] First, install multiple punch rings onto the core cylinder, and then connect two support shafts to both ends of the core cylinder;

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

[0030] Sucking and compacting the wound material and winding the skin on the outside of all the convex ring;

[0031] Installing the pressure ring at both ends of the core cylinder and sucking and compacting;

[0032] Installing the concave die block to seal the material of the cylindrical product in the cavity;

[0033] Heating the forming die until forming.

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

[0035] From the above technical solutions, the beneficial effects of the present application are:

[0036] 1. The die of the present application provides a mounting basis for multiple convex ring through the core cylinder, and the multiple convex ring is combined and spliced, which can form a split structure outside the core cylinder for easy disassembly, and provides a die profile on the inside of the cylindrical product. The core cylinder is connected as a support shaft connection basis, the pressure ring is sleeved on the support shaft and connected with the core cylinder, and the multiple concave die block is combined and spliced to form a concave die assembly, which can provide a die profile on the outside of the cylindrical product. Since the convex die block, the pressure ring and the concave die block are made of metal material, the cavity of the cylindrical product is formed by the concave die block, the convex die block and the pressure ring, which can strongly constrain the shape of the cylindrical product. Thus, the cylindrical product can be formed under process conditions, and the formed cylindrical product can have the same size as the designed shape. The dismountable connection of the convex die block and the concave die block, and the dismountable pressure ring form multiple dismountable structures on the outside of the cylindrical product. After the cylindrical product is formed, the entire forming die can be separated from the cylindrical product, effectively reducing the difficulty of demolding the cylindrical product from the die, smoothly separating the material from the die, maintaining the original structure, and improving the product quality, thereby meeting the production requirements.

[0037] 2. The method of the present application first removes the concave die block on the outside of the cylindrical product, which can expose the outside of the cylindrical product. By removing the core cylinder on the inside of the cylindrical product, the remaining die is a dismountable structure. The convex die block is only attached to the inside of the cylindrical product, and the force between the convex die block and each rib of the cylindrical product is limited or non-existent. Thus, the convex die block can be removed, effectively reducing the difficulty of demolding the cylindrical product from the die and smoothly separating the material from the die. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other embodiments can be obtained by those skilled in the art without creative effort based on these drawings.

[0039] Figure 1 An embodiment schematic view of the cylinder product of the present application is shown;

[0040] Figure 2 An embodiment schematic view of the forming die of the present application is shown;

[0041] Figure 3 An embodiment schematic view of Figure 2 is shown;

[0042] Figure 4 An embodiment schematic view of the compression ring of the present application is shown;

[0043] Figure 5 An embodiment partial sectional view of the punch assembly of the present application is shown;

[0044] Figure 6 An embodiment schematic view of Figure 5 is shown;

[0045] Figure 7 An embodiment schematic view of the punch ring of the present application is shown;

[0046] Figure 8 An embodiment schematic view of the punch ring of the present application is shown;

[0047] Figure 9 An embodiment schematic view of the first punch block of the present application is shown;

[0048] Figure 10 An embodiment schematic view of the second punch block of the present application is shown;

[0049] Figure 11 An embodiment schematic view of the first punch block of the present application is shown;

[0050] Figure 12 An embodiment schematic view of the second punch block of the present application is shown;

[0051] Figure 13 An embodiment schematic view of the core cylinder of the present application is shown;

[0052] Figure 14 An embodiment schematic view of Figure 13 is shown;

[0053] Figure 15 An embodiment schematic view of the concave die assembly of the present application is shown;

[0054] Figure 16 An embodiment of the concave die block of the present application is shown in the schematic view;

[0055] Figure 17 An embodiment of the concave die block of the present application is shown in the schematic view;

[0056] Figure 18 An embodiment of the support shaft of the present application is shown in the schematic view;

[0057] Figure 19 An embodiment of the support shaft of the present application is shown in the schematic view;

[0058] Reference signs: 100, male die 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 ring hole; 113b, outer ring hole; 120, male die ring; 120a, longitudinal groove; 120b, annular groove; 121, first male die block; 121a, acute angle bevel surface; 121b, male die positioning hole; 121c, male die connecting hole; 122, second male die block; 122a, obtuse angle bevel surface; 200, press ring; 210, outer circle positioning hole; 220, outer circle connecting hole; 230, press ring positioning hole; 240, press ring connecting hole; 300, female die assembly; 310, female die block; 311, female die connecting hole; 312, female die positioning hole; 320, female die longitudinal reinforcing rib; 330, female die annular reinforcing rib; 400, support shaft; 410, shaft; 420, flange; 421, flange positioning hole; 422, flange connecting hole; 430, rib plate; 440, positioning ring; 500, barrel body product; 510, annular rib; 520, longitudinal rib. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0060] It should be noted that all directionality indications in the embodiments of the present application are only used to explain the relative position relationship, movement condition and the like between components in a certain posture, and if the certain posture changes, the directionality indications also change accordingly.

[0061] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0062] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

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

[0064] Please refer to Figure 1 and Figure 2According to the first aspect of this application, a molding die is provided for manufacturing large-sized cylindrical products 500. Large-sized refers to cylindrical structural products with a length and diameter greater than or equal to 1.5m. The cylindrical product 500 is made of resin-based carbon fiber reinforced composite material, but other easily wound materials can also be used. The cylindrical product 500 is cylindrical, with intersecting annular ribs 510 and longitudinal ribs 520 on its inner side. The annular ribs 510 and longitudinal ribs 520 can be arranged perpendicularly to each other. The outer side of the cylindrical product 500 is smooth. The demolding problem mainly lies in demolding the inner side of the cylindrical product 500. The forming mold includes: a punch assembly 100, two pressure rings 200, a die assembly 300, and two support shafts 400. The punch assembly 100, pressure rings 200, die assembly 300, and support shafts 400 are all made of metal. During forming, the punch assembly 100 is located inside the cylindrical product 500, the pressure rings 200 are located at both ends of the cylindrical product 500 and are circular, the die assembly 300 is located outside the cylindrical product 500, and the support shafts 400 are connected to the core cylinder 110. The punch assembly 100 includes a core cylinder 110 and multiple punch rings 120. The core cylinder 110 is a hollow cylindrical shape. Two pressure rings 200 are both annular and are connected to both ends of the core cylinder 110. Corresponding holes are provided at both ends of the pressure rings 200 and the core cylinder 110. The pressure rings 200 and the core cylinder 110 can be detachably connected by screws, bolts, etc. The two support shafts 400 also have corresponding holes with the core cylinder 110. The support shafts 400 and the core cylinder 110 are detachably connected by screws, bolts, etc. The support shafts 400 are bush-sleeved connected to the pressure rings 200. The support shafts 400 are used to support the core cylinder 110 and transmit rotational torque around the axis. The two support shafts 400 can be connected to a drive device, such as a winding machine, so that the die assembly 300 and the punch assembly 100 can be rotated together through the support shafts 400.

[0065] Please refer to Figure 2 and Figure 3The core cylinder 110 is cylindrical and is a hollow annular cylinder. The outer surface of the core cylinder 110 is cylindrical. Multiple punch rings 120 are sleeved on the outer surface of the core cylinder 110. Each punch ring 120 is annular, and the ends of the multiple punch rings 120 are sequentially spliced ​​to form a cylindrical structure. That is, the multiple punch rings 120 can be spliced ​​at their ends to form an integral structure. The punch rings 120 serve as inner surfaces for inner support of the cylindrical product 500. Specifically, the outer surfaces of the punch rings 120 are supported on the inner side of the cylindrical product 500 during molding. The cylindrical structure is attached to the outer wall of the core cylinder 110 and located at both ends of the core cylinder 110. The two opposite outer end faces of the punch ring 120 are respectively set as circular stepped surfaces. The circular stepped 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 multiple punch blocks along the circumference. That is, each punch ring 120 can be spliced ​​by multiple punch blocks. The multiple punch blocks are detachably connected to the core cylinder 110. Specifically, holes are opened at corresponding positions of the punch ring 120 and the core cylinder 110. Bolts or screws can pass through these holes. The punch ring 120 and the core cylinder 110 are detachably connected by bolts or screws. The die assembly 300 is fitted around the outer periphery of the cylindrical structure, meaning it is located on the outside of the cylindrical product 500. The die assembly 300 serves as the outer surface, providing external support for the cylindrical product 500. The die assembly 300 is formed by splicing multiple die blocks 310 along the circumferential direction of the annular structure. A cavity exists between the die blocks 310 and the punch blocks, which the cylindrical product 500 fills. Both ends of the die blocks 310 are detachably connected to the corresponding pressure rings 200. (Please refer to...) Figure 4 The two ends of the die block 310 and the pressure ring 200 are provided with holes, and bolts or screws can be used to connect the die block 310 and the pressure ring 200 through the holes. Multiple die blocks 310, multiple punch rings 120 and two pressure rings 200 together form a cavity for manufacturing cylindrical product 500. The cylindrical product 500 can be formed using this cavity, which is easy to demold, has good product quality consistency and higher product precision.

[0066] Existing molds suffer from quality issues during demolding of cylindrical products (500mm), resulting in substandard product quality. This is due to several factors. First, existing hard molds have different coefficients of thermal expansion than the materials used. Since the product's coefficient of thermal expansion after curing is lower than that of ordinary metals, the shrinkage of the product and the mold differs during the cooling phase after high-temperature curing. This causes interaction forces between the annular grooves of the multiple metal punches and the annular ribs of the product, making demolding difficult and easily damaging the annular ribs. Second, existing composite molds use soft materials like silicone rubber in certain areas. Due to the high elasticity of silicone rubber, its constraint on the cylindrical product (500mm) is insufficient, resulting in large dimensional deviations in the longitudinal and annular ribs, leading to substandard product quality. Furthermore, silicone rubber suffers from aging and wear during repeated use.

[0067] This application provides a mounting base for multiple punch rings 120 through the core cylinder 110. By assembling and splicing multiple punch rings 120, a easily detachable split structure can be formed outside the core cylinder 110. A mold surface is provided on the inner side of the cylindrical product 500. The core cylinder 110 serves as the connecting base for the supporting rotating shaft 400. The pressure ring 200 is fitted onto the supporting rotating shaft 400 and connected to the core cylinder 110. Multiple die blocks 310 are assembled and spliced ​​to form a die assembly 300, providing a mold surface on the outer side of the cylindrical product 500. Furthermore, since the punch blocks, pressure rings 200, and die blocks 310 are made of metal, the die blocks 310, punch blocks, and pressure rings 200... The cavity forming the cylindrical product 500 provides strong constraint on its shape, allowing it to be molded under the specified process conditions. The molded cylindrical product 500 has the same dimensions as the designed shape. Through the detachable connection of the punch block and the die block 310, as well as the detachable pressure ring 200, multiple detachable structures are formed on the outside of the cylindrical product 500. This allows the entire molding mold to be removed from the cylindrical product 500 after molding, effectively reducing the difficulty of demolding the cylindrical product 500 from the mold. It also allows the material to be smoothly separated from the mold, maintaining the original structure, thereby improving product quality and meeting production requirements.

[0068] Please refer to Figure 5 , Figure 6 , Figure 7 and Figure 8In an optional embodiment, the punch assembly has a longitudinal groove 120a and a circumferential groove 120b. The longitudinal groove 120a has at least two, such as two or three, and is arranged along both ends of the punch assembly to form the intervals for manufacturing the longitudinal ribs 520. The circumferential groove 120b has at least one and a half, such as one and a half, two and a half, or three and a half, preferably one and a half. Half of the circumferential groove 120b is located at the end of the punch assembly and arranged circumferentially along the punch ring 120. The half of the circumferential groove 120b of adjacent punch assemblies is joined together to form one circumferential groove 120b. With this design, when an expansion difference occurs between the punch assembly and the cylindrical product 500, the punch assembly... The block can interact with the cylindrical product 500 and detach, solving the problem of axial interference between the multiple circumferential grooves 120b of the integral rigid mold and the multiple annular ribs 510 of the cured cylindrical product 500. The circumferential grooves 120b are set along both sides of the punch block to form the interval for manufacturing the annular ribs. The circumferential grooves 120b can be set in different positions in different punch blocks, and the above-mentioned quantity and position setting must be ensured. The longitudinal grooves 120a and the circumferential grooves 120b are both recessed on the outer surface of the punch block. The longitudinal grooves 120a and the circumferential grooves 120b are perpendicularly intersecting. Since the punch block is arc-shaped along the direction of the circumferential grooves 120b, the circumferential grooves 120b are also arc-shaped. In an optional embodiment, the aforementioned 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. The first and fourth punch rings 120 are located at both ends of the entire core cylinder 110, while the second and third punch rings 120 are located in the middle. Thus, multiple punch rings 120 are combined to form a punch assembly 100. In an optional embodiment, the mating points of the punch blocks of adjacent punch rings 120 form a circumferential groove 120b, or the mating points are flush. That is, in the axial direction of the cylindrical structure, among the adjacent punch rings 120, the positions of the punch blocks correspond to those of adjacent punch blocks, and the mating points of adjacent punch blocks have half a circumferential groove 120b. After the adjacent punch blocks are mated, they together form a circumferential groove 120b. Another mating method is that the mating points of adjacent punch blocks are flush, and there is no gap after mating. Thus, in multiple... After the punch rings 120 are assembled, they can have multiple circumferential grooves 120b; wherein, the end faces of the punch blocks located at both ends of the punch rings 120 are used for the end frame forming of the cylindrical product 500; the longitudinal grooves 120a of the multiple punch blocks corresponding to the same position of all punch rings 120 are located on the same straight line, the positions of the punch blocks at different positions of punch rings 120 are corresponding, and the positions of the longitudinal grooves 120a are corresponding, thus forming multiple parallel longitudinal grooves 120a on different punch rings 120 that extend to both ends of the core cylinder 110.

[0069] Please refer to Figure 9 andFigure 10 In an optional embodiment, the punch assembly includes multiple first punch assemblies 121 and multiple second punch assemblies 122. The multiple first punch assemblies 121 and multiple second punch assemblies 122 are alternately spliced ​​to form a ring structure. That is, at the same punch ring 120 position, the first punch assemblies 121 and the second punch assemblies 122 are arranged as a group, and multiple groups are arranged adjacently and around each other. In the entire ring structure, the first punch assemblies 121 and the second punch assemblies 122 are arranged alternately. This ring structure is the punch ring 120. Each punch ring 120 has the same structure and is formed by splicing the first punch assemblies 121 and the second punch assemblies 122. The two ends of the first punch assemblies 121 and the second punch assemblies 122 are respectively the two ends of the punch assembly 100 or the docking point of adjacent punch rings 120. The two sides of the first punch assemblies 121 and the second punch assemblies 122 are respectively the splicing points of the alternating splicing. In an optional embodiment, the first punch assembly 121 has acute-angled inclined planes 121a on both sides, forming an angle α between the acute-angled inclined planes 121a and the outer wall of the core cylinder 110. The second punch assembly 122 has obtuse-angled inclined planes 122a on both sides, forming an angle β between the obtuse-angled inclined planes 122a and the outer wall of the core cylinder 110, where α+β=180°. Using the above method, the first punch assembly 121 and the second punch assembly 122 can be seamlessly spliced ​​together, and the punch ring 120 formed by splicing multiple first punch assemblies 121 and second punch assemblies 122 is a perfect circle. At the same time, at the grid ribs of the cylindrical product 500, the first punch assembly 121 and the second punch assembly 122 serve as the inner surface of the cylindrical product 500, which facilitates disassembly and avoids the problem of soft mold wear by eliminating the need for a soft mold.

[0070] Please refer to Figure 11 and Figure 12The aforementioned first punch assembly 121 and second punch assembly 122 have six sides. Both the outer and inner sides of the first punch assembly 121 and second punch assembly 122 are arc surfaces. The outer side supports the inner wall of the cylindrical product 500, and the inner side supports the outer wall of the core cylinder 110. The aforementioned longitudinal groove 120a and circumferential groove 120b are formed by recesses on the outer sides of the first punch assembly 121 and second punch assembly 122. The longitudinal groove 120a extends from one end of the first punch assembly 121 and second punch assembly 122 to the other end. The circumferential groove 120b is formed by recesses on the outer sides of the first punch assembly 121 and second punch assembly 122. The outer sides of block 121 and second punch assembly 122 are arranged along the circumferential direction of punch ring 120. On the same punch ring 120, multiple first punch assemblies 121 and multiple second punch assemblies 122 are spliced ​​to form a ring structure, and each circumferential groove 120b is located on the same circumference. The end face of one end of the first punch assembly 121 and the second punch assembly 122 is half of the circumferential groove 120b, or is a flat surface, so that along the two ends of the core cylinder 110, adjacent first punch assemblies 121 or adjacent second punch assemblies 122 form a partial segment of the circumferential groove 120b at the end, or are seamlessly spliced.

[0071] Please refer to Figure 13In an optional embodiment, the core cylinder 110 includes a cylinder body 111, a first cylindrical ring 112, and a second cylindrical ring 113. The first cylindrical ring 112 and the second cylindrical ring 113 are respectively connected to the two ends of the cylinder body 111. The cylinder body 111 is detachably connected to a plurality of punch rings 120. The first cylindrical ring 112 and the second cylindrical ring 113 are respectively detachably connected to the corresponding pressure ring 200 and the support shaft 400. The cylinder body 111 is a hollow cylinder with cylindrical outer and inner surfaces. The first cylindrical ring 112 and the second cylindrical ring 113 are respectively located at the two ends of the cylinder body 111. The outer diameter of ring 113 is equal to the outer diameter of cylinder 111. The inner diameter of the first cylindrical ring 112 and the second cylindrical ring 113 is smaller than the inner diameter of cylinder 111. Cylinder 111, first cylindrical ring 112 and second cylindrical ring 113 are integrally formed structures. The first cylindrical ring 112 and the second cylindrical ring 113 are set to facilitate disassembly and connection with pressure ring 200 and support shaft 400. The first cylindrical ring 112 and the second cylindrical ring 113 are respectively disassembled and connected to the corresponding pressure ring 200 and support shaft 400. The connection between corresponding components adopts positioning parts, such as pins, screws or bolts, for detachable connection. Both the first cylindrical ring 112 and the second cylindrical ring 113 have two rings of holes distributed around their circumference. Each ring of holes includes a positioning hole and a connecting hole. The inner ring hole 113a is close to the inner side of the ring, and the outer ring hole 113b is close to the outer side of the ring. The inner ring hole 113a is used to position and connect the support shaft, such as positioning it in the flange positioning hole 421 and connecting it to the flange connecting hole 422. The outer ring hole 113b is used to position and connect the pressure ring, such as positioning it in the pressure ring positioning hole 230 and connecting it to the pressure ring connecting hole 240. The first cylindrical ring 112 and the second cylindrical ring 113 can simultaneously position and fix the support shaft 400 and the pressure ring 200.

[0072] Please refer to Figure 9 , Figure 10 and Figure 14In an optional embodiment, the cylinder 111, the first punch assembly 121, the second punch assembly 122, the first cylinder ring 112, the second cylinder ring 113, the pressure ring 200, the die assembly 310, and the support shaft are respectively provided with positioning elements, positioning holes, connecting elements, and connecting holes. The positioning elements match the corresponding positioning holes, and the positioning holes are used to insert the positioning elements. The connecting elements are inserted into the corresponding connecting holes to achieve detachable connections. The connecting elements can be bolts, and the detachable connections at each of the above locations are achieved by bolts. The positioning holes and connecting holes are used for positioning and connecting the cylinder 111 with the first punch assembly 121 and the second punch assembly 122, respectively. The positioning holes of the cylinder 111 correspond to the positioning holes of the first punch assembly 121 and the second punch assembly 122. After the positioning parts are inserted, the bolts are then inserted into the corresponding connecting holes to fix the first punch assembly 121 and the second punch assembly 122 to the outside of the cylinder 111. The positioning holes and connecting holes are also used for positioning and connecting the first cylindrical ring 112, the second cylindrical ring 113, and the corresponding pressure ring 200, respectively. The positioning holes of the first cylindrical ring 112 and the second cylindrical ring 113 correspond to the positioning holes of the corresponding pressure ring 200. After the positioning parts are inserted, the bolts are then inserted into the corresponding pressure rings 200. The corresponding connecting holes connect the first cylindrical ring 112 to the pressure ring 200 and the second cylindrical ring 113 to the pressure ring 200. The positioning holes and connecting holes are used for positioning and connecting the pressure ring 200 and the die assembly 310, respectively. The positioning holes of the two pressure rings 200 correspond to the positioning holes at both ends of the die assembly 310. After the positioning parts are inserted, the bolts are inserted into the corresponding connecting holes to connect the two pressure rings 200 to both ends of the die assembly 310, respectively. The positioning holes and connecting holes are also used for positioning and connecting the support shaft 400 to the first cylindrical ring 112 and the second cylindrical ring 113, respectively. The support shaft is connected to the first cylindrical ring or the second cylindrical ring through the positioning parts, and then the bolts are connected accordingly. Among the aforementioned connecting holes, the connecting holes of the first punch assembly 121, the second punch assembly 122, and the cylinder 111 are designed as oblong holes. The oblong hole design allows for a certain relative adjustment range between the components, facilitating the adaptation and production adjustment of the mold and the cylinder product 500. 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 Figure 9 , Figure 10 and Figure 14The aforementioned positioning holes and connecting holes are specifically configured as follows: the cylinder 111 is provided with a side wall positioning hole 111a for positioning and a side wall connecting hole 111b for connection; 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 in position and are recorded as a group; multiple groups of side wall positioning holes 111a and side wall connecting holes 111b are provided along the circumference of the cylinder 111, such as 8 groups forming a circle, and multiple circles are provided at intervals along both ends of the cylinder 111. On the first cylindrical ring 112 and the second cylindrical ring 113, the inner ring hole 113a and the outer ring hole 113b both include two types of holes: cylindrical ring positioning hole 112a and cylindrical ring connecting hole 112b. That is, there are the above two types of holes on the inner side and the outer side of the first cylindrical ring 112 and the second cylindrical ring 113. The pressure ring 200 is provided with a pressure ring positioning hole 230 and a pressure ring connecting hole 240 that pass through both sides. The cylindrical ring positioning hole 112a located on the outer side of the ring corresponds to the pressure ring positioning hole 230. There are two cylindrical ring positioning holes 112a corresponding to each pressure ring 200. The cylindrical ring connecting hole 112b corresponds to the pressure ring connecting hole 240. The cylindrical ring positioning hole 112a located on the inner side of the ring corresponds to the flange positioning hole 421. There are also two cylindrical ring positioning holes 112a corresponding to each support shaft 400. The cylindrical 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 radially oriented outer circular positioning hole 210 and an outer circular connecting hole 220. Both ends of the die assembly 310 are provided with die connecting holes 311 and die positioning holes 312. The ends of each die assembly 310 are the same. The two die connecting holes 311 are located on both sides of the die positioning holes 312. The die positioning holes 312 correspond to the outer circular positioning holes 210, and the die connecting holes 311 correspond to the outer circular connecting holes 220. The pressure ring 200 is provided with corresponding pressure ring positioning holes 230 and pressure ring connecting holes 240, which are set as a pair. The outer circular positioning holes 210 and outer circular connecting holes 220 surround the pressure ring 200 and are provided in multiple sets. The outer circular positioning holes 210 and outer circular connecting holes 220 in each set correspond to the die positioning holes 312 and die connecting holes 311 at the ends of the die assembly 310.

[0074] Please refer to Figure 15 , Figure 16 and Figure 17In an optional embodiment, the die assembly 310 has longitudinal reinforcing ribs 320 and circumferential reinforcing ribs 330 intersecting on its outer side. Multiple die assemblies 310 are provided, and their two sides are sequentially joined together to form a ring. The number of die assemblies 310 is greater than or equal to four. Each die assembly 310 has six arc-shaped surfaces, with both its outer and inner surfaces being arc-shaped. The outer surface of the die assembly 310 is provided with... The die assembly has longitudinal reinforcing ribs 320 and circumferential reinforcing ribs 330, with smooth inner surfaces. The inner surface of the die assembly 310 is used to closely adhere to the outer surface of the cylindrical product 500. The longitudinal reinforcing ribs 320 are arranged along both ends of the die assembly 310, and the circumferential reinforcing ribs 330 are arranged along the arc-shaped surface. The longitudinal reinforcing ribs 320 are perpendicular to the circumferential reinforcing ribs 330. By setting the above-mentioned reinforcing ribs, the structural strength of the die assembly 300 can be improved.

[0075] Please refer to Figure 3 , Figure 18 and Figure 19 In an optional embodiment, the supporting shaft 400 includes a shaft 410, a flange 420, a positioning ring 440, and a stiffening plate 430. The flange 420 is connected to the shaft 410, and the positioning ring 440 is attached to the flange 420. The positioning ring 440 forms a circular stepped surface on the side of the flange 420. The stiffening plate 430 is connected to the flange 420 and the shaft 410. The flange 420 has a perforated hole. The shaft 410, flange 420, positioning ring 440, and stiffening 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 to a drive. The device includes a positioning ring 440 protruding from the surface of the flange 420, located on both sides of the flange 420 along with the rotating shaft 410. A stiffening plate 430 is located on the flange 420 facing the rotating shaft 410, with one side of the stiffening plate 430 perpendicularly connected to the flange 420 and the other side of the stiffening plate 430 perpendicularly connected to the outer side of the rotating shaft 410. When the flange 420 is connected to the pressure ring 200, it is located inside the pressure ring 200 via a bushing connection. The outer diameter of the flange 420 matches the inner diameter of the pressure ring 200. The positioning ring 440 is located inside the annular rings 112 and 113 via a bushing connection. The flange 420 is provided with a plurality of flange positioning holes 421 and flange connection holes 422 arranged at intervals and surrounding the outer side of the positioning ring 440. The positioning holes and connection holes are the same as those described above. The flange positioning hole 421 corresponds to the cylindrical ring positioning hole 112a belonging to the inner ring hole 113a, and the flange connection hole 422 corresponds to the cylindrical ring connection hole 112b belonging to the inner ring hole 113a. The second cylindrical ring 113 is also configured in the same way. It is first positioned by the positioning hole, and then the support shaft 400 is connected to the first cylindrical ring 112 and the second cylindrical ring 113 at both ends by bolts passing through the corresponding connection holes.

[0076] In an optional embodiment, the aforementioned punch assembly, pressure ring 200, and die assembly 310 are all made of ordinary carbon steel, and the support shaft 400 can also be made of ordinary carbon steel. The aforementioned materials can also be hard metal alloys. Hard metal alloys, such as alloy steel, have a wide range of choices. By selecting low-cost materials, the manufacturing cost of the mold can be effectively reduced, and the entire mold has strong structural strength and is not easily deformed. During the molding of the cylindrical product 500, it can provide strong support on the outside of the cylindrical product 500, maintaining the structure of the cylindrical product 500.

[0077] Please refer to Figure 2 A second aspect of this application provides a molding method for manufacturing a cylindrical product 500 using the aforementioned molding die. This molding method is used for molding resin-based fiber-reinforced composite materials, where the cylindrical product is made of resin-based fiber-reinforced composite material, such as resin-based carbon fiber-reinforced composite material. The molding method includes:

[0078] First, install the core cylinder 110 and the punch ring 120 to assemble the punch assembly 100. Specifically, install multiple punch rings 120 on the core cylinder 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 111. Then, connect the two support shafts 400 to both ends of the core cylinder 110 and fix them with screws or bolts. Then, the two supporting shafts 400 of the mold are clamped by the winding machine to support the mold horizontally. The material of the cylindrical product 500 is then wound around the outside of all the punch rings 120. The material of the cylindrical product 500 is wound and filled in the longitudinal grooves 120a and the circumferential grooves 120b respectively. For example, when winding carbon fiber prepreg, the longitudinal grooves 120a are wound in sequence first, and then the circumferential grooves 120b are wound in sequence. This is one winding cycle. During the winding process, the carbon fiber prepreg is folded over at both ends of the punch assembly 100 and then spread out and adheres to both ends of the punch assembly 100 until the longitudinal grooves 120a and the circumferential grooves 120b are fully wound with carbon fiber prepreg. Then, the two ends are folded over to the end face of the punch ring 120.

[0079] Next, the wound carbon fiber prepreg yarn is subjected to adhesive absorption and compaction. After this treatment, carbon fiber prepreg skin is wound onto the surface of the material and the punch assembly 100 until the skin thickness reaches the required level. The carbon fiber skin is folded over at both ends of the punch assembly 100 and attached to the left and right ends of the punch assembly 100. Then, pressure rings 200 are installed at both ends of the core cylinder 110 and adhesive absorption and compaction are performed. Finally, the die assembly blocks 310 are installed, and the two ends of multiple die assembly blocks 310 are connected to the corresponding pressure rings 200, thus sealing the manufactured material inside the die assembly 300.

[0080] During the winding stage, the punch blocks are positioned by locating pins and connected to the core ring by screws (bolts). However, before vacuuming, the locating pins need to be removed, while the screw (bolt) connection remains. This is necessary so that during the cooling stage after curing, the punch blocks can be pushed axially apart by the multiple annular ribs of the core ring. After winding is completed, the locating pins between each of the first punch blocks 121, the second punch blocks 122, and the core ring 110 are removed, while the connecting bolts remain in place.

[0081] The molding die is fed into the processing device, such as an autoclave. A vacuum film is wrapped around the die, a vacuum is created, and then heating and pressurization are applied. Specifically, the die, after being wrapped with material, is placed into the autoclave. The entire die is wrapped in a vacuum bag with a vacuum nozzle. The vacuum nozzle on the bag is connected to the vacuum nozzle of the autoclave, and a vacuum is created. The product is then heated and pressurized within the autoclave according to the process specifications until it is formed. After the cylindrical product has formed and cooled to room temperature, it is cooled along with the mold within the autoclave.

[0082] During the process of winding the mold in a horizontal state, entering the autoclave, and curing, the mold is supported in a horizontal state by the support shafts 400 at both ends. When flipping it to a vertical state, first remove the concave mold assembly 310 from the outside of the cylindrical product 500 by removing the bolts. Then, remove the pressure rings 200 and support shafts 400 from both sides of the cylindrical product 500 by removing the bolts first and then removing the pressure rings 200 and support shafts 400.

[0083] Then, the core cylinder 110 is removed from the inside of the cylindrical product 500. First, the connection between the core cylinder 110 and each punch assembly is disassembled. The core cylinder 110 is pulled upwards, and then the punch assembly is removed from the inside of the cylindrical product 500. Due to the difference in the coefficient of thermal expansion between the cylindrical product 500 and the mold, each punch assembly can shrink and separate from the inside of the cylindrical product 500 in the radial direction. In the axial direction, the axial length of the cylindrical product 500 is greater than the axial length of the punch assembly. Thus, the multiple annular ribs 510 of the cylindrical product 500 are used to separate the adjacent punch assemblies that form the circumferential groove 120b along the axial direction, so that the punch assembly can be removed smoothly. This avoids interference between the multiple annular ribs 510 of the cylindrical product 500 and the multiple circumferential grooves 120b of the integral rigid punch assembly 100, which would lead to demolding difficulties or damage.

[0084] Existing molding methods present difficulties in demolding the cylindrical product 500. Currently, when molding the cylindrical product 500, a hard mold method is used. After the product cools, it is difficult to separate the cylindrical product 500 from the mold. This is because the coefficient of thermal expansion of the cylindrical product 500 is different from that of the material. Since the coefficient of thermal expansion 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. This causes an interaction force to be generated between the circumferential groove 120b of the metal punch and the multiple annular ribs 510 of the product, resulting in difficulties in demolding. This application first removes the outer side of the cylindrical product 500 by removing the concave mold block 310, thus exposing the outer side of the cylindrical product 500. Then, by removing the inner core cylinder 110 of the cylindrical product 500, the remaining molds are all detachable structures. The convex mold block is only attached to the inner side of the cylindrical product 500, and the force between the convex mold block and the ribs of the cylindrical product 500 is limited or non-existent. Therefore, the convex mold block can be removed easily, effectively reducing the difficulty of demolding the cylindrical product 500 from the mold and allowing for smooth separation of the material. Furthermore, the above molding method simplifies the molding process of the cylindrical product 500, enabling it to be molded in one step using a mold.

[0085] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," "optional example," or "optional implementation," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0086] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

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

Claims

1. A molding die for a cylindrical body with mesh reinforcement, used to manufacture cylindrical products (500), characterized in that, The inner side of the cylindrical product (500) has intersecting annular ribs (510) and longitudinal ribs (520), and the molding die includes: The punch assembly (100) includes a core cylinder (110) and multiple punch rings (120). The ends of the multiple punch rings (120) are sequentially spliced ​​to form a cylindrical structure for supporting the inner side of the cylindrical product (500). The cylindrical structure is attached to the outer wall of the core cylinder (110). The punch ring (120) is an annular structure formed by splicing multiple punch blocks circumferentially. The multiple punch blocks are detachably connected to the core cylinder (110). The punch blocks are made of metal. Two pressure rings (200) are respectively connected to both ends of the core cylinder (110), and the pressure rings (200) are made of metal. A die assembly (300) is fitted around the outer periphery of the cylindrical structure and is used for the outer support of the cylindrical product (500). The die assembly (300) is formed by splicing multiple die blocks (310) along the circumference of the annular structure. The two ends of the die blocks (310) are detachably connected to the corresponding pressure rings (200). The pressure rings (200) are made of metal. The multiple die blocks (310), multiple punch rings (120), and two pressure rings (200) together form a cavity for manufacturing the cylindrical product (500). Two support shafts (400) are detachably connected to both ends of the core cylinder (110). The support shafts (400) are connected to the bushing of the pressure ring (200). The support shafts (400) are used to support the core cylinder (110) and transmit rotational torque around the axis. The punch assembly includes multiple first punch assemblies (121) and multiple second punch assemblies (122), and the multiple first punch assemblies (121) and multiple second punch assemblies (122) are alternately assembled to form the ring structure; The core cylinder (110) includes a cylinder body (111), a first cylindrical ring (112), and a second cylindrical ring (113). The first cylindrical ring (112) and the second cylindrical ring (113) are respectively connected to both ends of the cylinder body (111). The cylinder body (111) is detachably connected to a plurality of punch rings (120). The first cylindrical ring (112) and the second cylindrical ring (113) are detachably connected to the corresponding pressure ring (200) and the corresponding support shaft (400), respectively. The cylindrical body (111), the first punch assembly (121), the second punch assembly (122), the first cylindrical ring (112), the second cylindrical ring (113), the pressure ring (200), the concave die assembly (310), and the support shaft (400) are respectively provided with connecting holes and connecting parts. The connecting parts are connected to the corresponding connecting holes. The connecting parts and the corresponding connecting holes are respectively used for connecting the cylindrical body (111) with the first punch assembly (121) and the second punch assembly (122), connecting the first cylindrical ring (112), the second cylindrical ring (113) with the corresponding pressure ring (200), connecting the pressure ring (200) with the concave die assembly (310), and connecting the support shaft (400) with the first cylindrical ring (112) and the second cylindrical ring (113). The connecting holes of the first punch block (121), the second punch block (122), and the cylinder (111) are designed as waist-shaped holes; The punch assembly has at least one and a half circumferential grooves (120b). The half of the circumferential groove (120b) is located at the end of the punch assembly and is arranged circumferentially along the punch ring (120). The half of the circumferential groove (120b) of adjacent punch assemblies is spliced ​​together to form one circumferential groove (120b). The circumferential grooves (120b) are arranged along both sides of the punch assembly to form the interval for manufacturing the annular rib (510). The number of the circumferential grooves (120b) is one and a half, wherein one of the circumferential grooves (120b) is located between the two ends of the punch block. When using the molding die, during the cooling stage after curing, the punch block is pushed axially apart by the multiple annular ribs (510) of the cylindrical product (500).

2. The forming mold for the ribbed cylinder according to claim 1, characterized in that, The punch assembly is also provided with longitudinal grooves (120a), and there are at least two longitudinal grooves (120a). The longitudinal grooves (120a) are arranged along both ends of the punch assembly to form the intervals for manufacturing the longitudinal ribs (520).

3. The forming mold for the ribbed cylinder according to claim 2, characterized in that, The mating points of the punch blocks of adjacent punch rings (120) form a circumferential groove (120b), or the mating points are flush; 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.

4. The forming mold for the ribbed cylinder according to claim 1, characterized in that, The first punch assembly (121) has acute-angled inclined planes (121a) on both sides, and the acute-angled inclined planes (121a) form an angle α with the outer wall of the core cylinder (110). The second punch assembly (122) has obtuse-angled inclined planes (122a) on both sides, and the obtuse-angled inclined planes (122a) form an angle β with the outer wall of the core cylinder (110), where α+β=180°.

5. The forming mold for the ribbed cylinder according to claim 1, characterized in that, The cylindrical body (111), the first punch assembly (121), the second punch assembly (122), the first cylindrical ring (112), the second cylindrical ring (113), the pressure ring (200), the die assembly (310), and the support shaft (400) are respectively provided with positioning holes and positioning elements. The positioning elements match the corresponding positioning holes. The positioning elements and the corresponding positioning holes are respectively used for positioning the cylindrical body (111) with the first punch assembly (121) and the second punch assembly (122), positioning the first cylindrical ring (112), the second cylindrical ring (113), and the corresponding pressure ring (200), positioning the pressure ring (200) with the die assembly (310), and positioning the support shaft (400) with the first cylindrical ring (112) and the second cylindrical ring (113).

6. The forming mold for the ribbed cylinder according to claim 1, characterized in that, The die block (310) is provided with longitudinal reinforcing ribs (320) and circumferential reinforcing ribs (330) in a cross pattern.

7. The forming mold for the ribbed cylinder according to claim 1, characterized in that, The supporting shaft (400) includes a shaft (410), a flange (420), a positioning ring (440), and a stiffening plate (430). The flange (420) is connected to the shaft (410), the positioning ring (440) is attached to the flange (420), and the stiffening plate (430) is connected to the flange (420) and the shaft (410).

8. A molding method, characterized in that, The molding die for the ribbed cylinder as described in any one of claims 1-7 includes: First, install the core cylinder (110) and the punch ring (120), install the support shaft (400), then wrap the material of the cylindrical product (500) around the outside of all the punch rings (120), install the pressure ring (200), and finally install the die block (310). The molding die is sent into a heating and pressurizing device, a vacuum film is wrapped around it, a vacuum is drawn, and then it is heated and pressurized again until the cylindrical product (500) is formed and cooled. First, remove the concave mold assembly (310) from the outside of the cylindrical product (500), and then remove the pressure ring (200) and the support shaft (400) from both sides of the cylindrical product (500). Then the core cylinder (110) is removed from the inside of the cylindrical product (500), and the punch assembly is removed from the inside of the cylindrical product (500).

9. The molding method according to claim 8, characterized in that, When the punch assembly has an circumferential groove (120b) and a longitudinal groove (120a), the specific steps before forming the cylindrical product (500) include: First, install multiple punch rings (120) onto the core cylinder (110), and then connect two support shafts (400) to both ends of the core cylinder (110); The material of the cylindrical product (500) is wound into the longitudinal groove (120a) and the circumferential groove (120b) respectively until the longitudinal groove (120a) and the circumferential groove (120b) are filled. The material to be wound is absorbed and compacted, and a skin is wrapped around the outside of all the said punch rings (120); The pressure rings (200) are installed at both ends of the core cylinder (110) and then pressed with adhesive. Install the concave mold assembly (310) to enclose the material of the cylindrical product (500) in the cavity; Heat the molding die until it is formed.

10. The molding method according to claim 8, characterized in that, The molding method is used for molding resin-based fiber-reinforced composite materials, and the material of the cylindrical product (500) is resin-based fiber-reinforced composite material.

Images