Linerless composite tank umbrella-shaped retractable forming die and forming method

Abstract

This invention provides a telescopic umbrella-shaped mold and molding method for a linerless composite material storage tank, including an umbrella-shaped support frame, a segmented outer mold assembly, an adjusting screw, and an outer mold locking device. The umbrella-shaped support frame includes radial telescopic connecting rods for the front and rear end caps, radial telescopic connecting rods for the cylindrical sections, a threaded sleeve, an adjusting slider, a quick-release slider locking device, and a quick-release device fixing pin. The axial displacement of the threaded sleeve is guided by the rotation of the adjusting screw, enabling the umbrella-shaped support frame to unfold and retract. The segmented outer mold assembly is composed of multiple lightweight, high-rigidity sandwich composite material pieces. Z-shaped splicing steps are provided on the sides of the modules, and a block-release locking device is installed at the splicing points of the blocks. The outer mold locking device mainly consists of a locking pin and a locking body pin, reliably positioning the outer blocks and allowing for quick disengagement. This tooling adopts a modular design, possessing good support rigidity, convenient assembly and disassembly, and high reset accuracy, significantly improving the molding accuracy and efficiency of the composite material storage tank.

Description

Technical Field

[0001] This invention belongs to the field of advanced composite material molding technology, specifically, it relates to a retractable umbrella-shaped molding die and molding method for an unlined composite material storage tank. Background Technology

[0002] In the existing technology, in order to remove the mold from the inside of the tank after the lining-free composite material tank is formed, the mold types used mainly include segmented metal core mold, water-soluble core mold, low melting point alloy core mold, foam core mold, inflatable core mold, composite skeleton core mold, etc.

[0003] The invention patents CN112895503B and CN211137822U, both using segmented metal core molds, offer high stability, high molding precision and internal cavity cleanliness, and high reusability. However, they are heavy, difficult to handle and disassemble, and expensive. The invention patent CN115095789B uses low-melting-point metals, which are reusable and have strong structural plasticity. However, it is also heavy, difficult to manufacture, requires a high-quality demolding environment, and is expensive.

[0004] The invention patent with announcement number CN111678033B uses a water-soluble core mold, which has strong structural plasticity and is easy to demold, but it cannot be reused, the cleanliness of the inner cavity cannot be guaranteed, and the manufacturing process is difficult. The invention patent with announcement number CN106003755B uses a foam core mold, which is lightweight and low-cost, but it is easily deformed, difficult to manufacture, and has low precision for reuse. The invention patent with announcement number CN105585848B uses an inflatable core mold, which is lightweight, low-cost, and easy to demold, but has low molding precision and is difficult to manufacture.

[0005] In addition, the invention patents with announcement number CN109177226B and publication number CN111016223A adopt a combined frame type, which is lightweight and has a high degree of matching with the performance of the box material, but the disassembly and assembly steps are complicated and the accuracy of repeated assembly is low.

[0006] The invention patent with publication number CN119610501A proposes a composite material storage tank molding die and its manufacturing method. However, when demolding the die, a large number of screws and support plate nuts of the segmented cylinder body need to be manually disassembled, which is complicated and time-consuming. In addition, the end cap connecting block and the cylinder section connecting ring must remain permanently inside the product, resulting in low demolding efficiency, increased weight of the residual structure, and limited applicable size.

[0007] In view of this, there is an urgent need to develop a non-lining composite material storage tank umbrella-shaped telescopic molding die and molding method to overcome a series of defects in the existing technology. Summary of the Invention

[0008] In view of the shortcomings of the prior art, the purpose of this invention is to provide a non-lining composite material storage tank umbrella-shaped telescopic molding die and molding method, which can avoid the technical defects of traditional molds such as large weight, low accuracy of reusability, and complicated disassembly and assembly process.

[0009] According to the present invention, a non-lining composite material storage tank umbrella-shaped telescopic molding die includes: an umbrella-shaped support frame 1, a segmented outer mold assembly 2, a base rod 3, an adjusting screw 4, and an outer mold locking device 5. The umbrella-shaped support frame 1 is mounted on the base rod 3 to achieve axial movement. The adjusting screw 4 is located inside the base rod 3. Rotating the adjusting screw 4 can enable the umbrella-shaped support frame 1 to unfold and retract. The telescopic connecting rod of the umbrella-shaped support frame 1 is connected to the segmented outer mold assembly 2, which can control the segmented outer mold assembly 2 to unfold or retract. The outer mold locking device 5 is installed at the seam of the segmented outer module, which can accurately position the relative positions of the segmented outer mold components 2.

[0010] Preferably, the umbrella-shaped support frame 1 includes a head radial telescopic connecting rod 11, a cylinder section radial telescopic connecting rod 12, an adjusting slider 13, a threaded sleeve 14, a quick-release slider locking device 15, and a quick-release device fixing pin 16. The threaded sleeve 14 of the umbrella-shaped support frame 1 is installed and fixed at the center of the adjusting slider 13. The adjusting slider 13 is fitted on the base rod 3. One end of the radial telescopic connecting rod 12 of the cylindrical section is hinged to the adjusting slider 13, and the other end is hinged to the split outer mold assembly 2. By adjusting the rotation of the screw 4, the threaded sleeve 14 is guided to undergo axial displacement, thereby enabling the umbrella-shaped support frame 1 to unfold and retract. The quick-release slider locking device 15 is inserted into the positioning hole of the adjusting slider 13, and the quick-release slider locking device 15 is fixed by the quick-release device fixing pin 16, thereby completing the position locking of the adjusting slider and the base rod 3 and realizing the positioning and fixing of the umbrella-shaped support frame 1.

[0011] Preferably, the segmented outer mold assembly 2 includes a front end cap segmented outer module 21, a cylindrical section segmented outer module 22, and a rear end cap segmented outer module 23; each segmented outer module is hinged to a telescopic connecting rod, and the unfolded shape of the segmented outer mold assembly 2 is consistent with the inner surface of the storage tank. Each segment of the segmented outer mold assembly 2 is divided into 2 to 6 groups, and each group of segmented modules is hinged to a pair of adjusting sliders 13 via a cylindrical radial telescopic connecting rod 12. The radial telescopic connecting rods of the cylinder segment connected to each segment's outer module are circumferentially staggered to ensure that each segment can be axially pulled out through the storage tank end hole after being retracted.

[0012] Preferably, the front end cap segmented outer module 21 includes an inner mold 211 and an outer mold 212. The outer module 22 of the segmented cylinder includes an inner mold 221 and an outer mold 222 of the outer module. The rear end cap segmented outer module 23 includes an inner mold 231 and an outer mold 232. During demolding, the following molds are sequentially pulled out: the inner mold 231 of the rear end cap segment outer module, the outer mold 232 of the rear end cap segment outer module, the inner mold 211 of the front end cap segment outer module, the outer mold 212 of the front end cap segment outer module, the inner mold 221 of the cylindrical segment segment outer module, and the outer mold 222 of the cylindrical segment segment outer module.

[0013] Preferably, the adjusting screw 4 is installed inside the base rod 3 and is a screw with a limiting flange in the middle, which controls the axial movement of the threaded sleeve 14 by rotation.

[0014] Preferably, the base rod 3 is a grooved metal square tube with flange holes at both ends for connecting to the shaft of the winding machine; The base rod 3 and the adjusting slider 13 are provided with positioning pin holes. When the mold extends to the set position, the positioning pins are used to fix the adjusting slider 13 to the base rod 3.

[0015] Preferably, the outer mold locking device 5 is mainly composed of a locking pin 51 and a locking body pin 52, which is installed at the joint of the segmented outer module to accurately position the relative positions of the segmented outer mold components 2. The outer mold locking device 5 is set at 2 to 4 points on each seam of the segmented outer module.

[0016] Preferably, the segmented outer mold component 2 is a carbon fiber composite curved plate with an expansion coefficient close to that of the product, and the side of the module is provided with Z-shaped splicing steps to facilitate quick splicing and positioning. The splicing step surface of the segmented outer mold located in the priority demolding section is set from the outside to the inside in the radial direction, while the splicing step surface of the segmented outer mold located in the subsequent demolding section is set from the inside to the outside in the radial direction.

[0017] A molding method for a linerless composite material storage tank umbrella-shaped telescopic mold according to the present invention includes the following steps: Step 1: Connect the segmented outer module of the segmented outer mold assembly 2 to the radial telescopic connecting rod 11 of the end cap according to the tooling drawings, and then assemble the umbrella-shaped support frame 1. Step 2: Sequentially mount the umbrella-shaped support frame 1 of the front end cap segmented outer module 21, the cylindrical segmented outer module 22, and the rear end cap segmented outer module 23 onto the base rod 3 and unfold them into place. Use the outer mold locking device 5 to accurately position and lock the segmented outer modules. Use the positioning pin to position the adjusting slider 13 on the base rod 3 to form the winding core mold. Step 3: Install the mandrel onto the winding or laying equipment, wind or lay up the fibers according to the product requirements, and heat and cure after molding; Step 4: After curing, remove the mold from the product.

[0018] Preferably, step four includes the following steps: S1: Remove the pivots on base rod 3 from both ends; S2: Pull out the positioning pins of the front and rear section adjustment sliders 13 and base rod 3 to release the lock between the adjustment sliders 13 and base rod 3; use the steel cable to pull out the locking pin 52 on the outer mold locking device 5 to release the lock between the outer modules; use the steel cable to pull out the quick release device fixing pin 16, and the quick release slider locking device 15 pops out by itself to release the lock between the adjustment sliders 13 and base rod 3. S3: The adjusting screw 4 is inserted into the end hole of the base rod 3 and screwed into the threaded sleeve 14. The limiting flange is installed on the adjusting screw 4 as required. Then, the adjusting screw 4 is rotated to move the threaded sleeve 14 along the base rod 3 to the outside of the storage tank, which drives the telescopic connecting rod on the adjusting slider 13 to retract, separating the front and rear segmented outer mold assembly 2 from the product and stacking them together. Then, this part of the mold is pulled out from the end hole of the product. S4: Repeat step S3 to radially shrink the umbrella-shaped support frame 1 with the segmented outer module connected to the cylindrical section, separate the mold from the product and stack them together. First, shrink and remove the inner mold 231 of the segmented outer module of the rear end cap, then shrink and remove the outer mold 232 of the segmented outer module of the rear end cap. Then, in the same manner, alternately shrink and move the inner mold 211 of the segmented outer module of the front end cap, the outer mold 212 of the segmented outer module of the front end cap, the inner mold 221 of the segmented outer module of the cylindrical section, and the outer mold 222 of the segmented outer module of the cylindrical section. After shrinking, together with the base rod 3, pull it out from the end hole of the product to complete the demolding and obtain the composite material storage tank product 6.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention uses lightweight composite materials to make segmented outer mold components, achieving mold lightweighting, and designs a metal umbrella structure as a support frame. The mold unfolds and retracts through a screw mechanism, effectively reducing the complexity of mold assembly and disassembly. An outer mold locking device is used to ensure the assembly accuracy of segmented outer molds and improve the overall mold reusability accuracy.

[0020] 2. This invention uses a modular design such as a retractable umbrella-shaped support frame, a segmented outer mold assembly, and a base rod. The tooling structure has good support rigidity, is relatively simple, and is easy to assemble and disassemble, which greatly improves manufacturing efficiency.

[0021] 3. The present invention can control the opening amount of the umbrella-shaped frame by the position of the positioning pin hole on the base rod. At the same time, by changing the segmented outer mold, different sizes of storage tanks can be formed, which has a certain degree of versatility.

[0022] 4. The segmented outer module of this invention uses a lightweight, high-rigidity carbon fiber composite curved plate with an expansion coefficient close to that of the product, which significantly reduces the weight of the mold and avoids the problem of large differences in the thermal expansion coefficients between the mold and the product.

[0023] 5. The retractable umbrella-shaped support frame of this invention is fitted onto a square base rod by adjusting the slider. The slider and the base rod are positioned using pin holes and pins. The outer mold locking device is installed at the seam of the segmented outer module, which ensures high precision for multiple resets and improves the durability of the mold.

[0024] 6. This tooling adopts a modular design, has good support rigidity, is easy to disassemble and assemble, and has high resetting accuracy. It is suitable for manufacturing large-sized composite material storage tanks without linings. It solves the problems of complex mold assembly, easy deformation, and decreased accuracy after repeated use of traditional molding tooling, and significantly improves the molding accuracy and efficiency of large-sized composite material storage tanks.

[0025] 7. This invention ensures the cleanliness of the inner cavity during tank molding, enabling efficient and high-quality molding of large-sized, liner-less composite material tanks. This mold can be widely applied to the manufacturing of other aerospace-grade winding and three-dimensional braiding structural components. Attached Figure Description

[0026] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of the umbrella-shaped telescopic molding die for a linerless composite material storage tank according to an embodiment of the present invention; Figure 2 This is a schematic cross-sectional view of the umbrella-shaped telescopic molding die for an unlined composite material storage tank according to an embodiment of the present invention. Figure 3 This is a top view of the telescopic mold for forming an umbrella-shaped composite material tank without lining, according to an embodiment of the present invention. Figure 4(a) is a schematic diagram of the demolding process of the inner layer mold of the rear end cap of the umbrella-shaped telescopic molding die of the non-lining composite material tank of the present invention. Figure 4(b) is a schematic diagram of the demolding process of the outer layer mold of the rear end cap of the umbrella-shaped telescopic molding die of the liningless composite material tank of the present invention. Figure 4(c) is a schematic diagram of the alternating demolding process of the inner layer mold of the outer module of the segmented outer module of the cylindrical section and the outer layer mold of the outer module of the cylindrical section of the cylindrical section in the embodiment of the present invention for the umbrella-shaped telescopic molding mold of the unlined composite material tank; Figure 4(d) is a schematic diagram of the demolding of the inner layer mold of the outer module of the cylindrical segment of the telescopic mold for the umbrella-shaped non-lined composite material tank of the present invention, and the outer layer mold of the outer module of the cylindrical segment.

[0027] The diagram shows: Detailed Implementation

[0028] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0029] A retractable umbrella-shaped mold for a non-lining composite material storage tank includes an expandable umbrella-shaped support frame 1, a segmented outer mold assembly 2, a base rod 3, an adjusting screw 4, and an outer mold locking device 5.

[0030] Furthermore, the umbrella-shaped support frame 1 includes a head radial telescopic connecting rod 11, a cylindrical section radial telescopic connecting rod 12, an adjusting slider 13, and a threaded sleeve 14. The threaded sleeve 14 of the umbrella-shaped support frame 1 is installed and fixed at the center of the adjusting slider 13, which is fitted onto the base rod 3. One end of the cylindrical section radial telescopic connecting rod 12 is hinged to the adjusting slider 13, and the other end is hinged to the segmented outer mold assembly 2. The threaded sleeve 14 is axially displaced by rotating the adjusting screw 4, thereby enabling the umbrella-shaped support frame 1 to unfold and retract. A quick-release slider locking device 15 is inserted into the positioning hole of the adjusting slider 13, and the quick-release slider locking device 15 is fixed by the quick-release device fixing pin 16, thus locking the position of the adjusting slider 13 and the base rod 3 and achieving the positioning and fixing of the umbrella-shaped support frame 1.

[0031] Furthermore, the segmented outer mold assembly 2 includes a front end cap segmented outer module 21, a cylindrical section segmented outer module 22, and a rear end cap segmented outer module 23. Each segmented outer module is hinged to a telescopic connecting rod. The unfolded shape of the segmented outer mold assembly 2 is consistent with the inner surface of the storage tank.

[0032] Furthermore, each segment of the segmented outer mold assembly 2 is divided into 2 to 6 groups. Each group of segmented modules is hinged to a pair of adjusting sliders 13 via a cylindrical radial telescopic connecting rod 12. The cylindrical radial telescopic connecting rods 12 connected to each segment of the outer mold are circumferentially misaligned to ensure that each segment can be axially pulled out through the storage tank end hole after being retracted.

[0033] Furthermore, the base rod 3 is a grooved, high-rigidity metal square tube with flange holes at both ends for connecting to the winding machine shaft; the adjusting screw 4 is installed inside the base rod 3 and is a screw with a limiting flange in the middle, which controls the axial movement of the threaded sleeve 14 by rotation.

[0034] Furthermore, the outer mold locking device 5 is mainly composed of a locking pin 51 and a lock body pin 52 that can be quickly removed. It is installed at the joint of the segmented outer module and plays a role in accurately positioning the relative positions of the segmented outer mold components 2, so as to achieve the functions of quick and accurate reset and quick removal. The outer mold locking device 5 is provided at 2 to 4 locations on each joint of the segmented outer module.

[0035] Furthermore, the umbrella-shaped support frame 1, with its connected segmented outer mold assembly 2, has adjusting sliders 13 distributed axially from the outside to the inside on the base rod 3 according to the stacked state when folded, to prevent interference during unfolding and folding. The axis closest to the base rod 3 is designated as the inside, and the end closest to the base rod 3 is designated as the outside.

[0036] Furthermore, the base rod 3 and the adjusting slider 13 are provided with positioning pin holes. When the mold extends to the set position, the positioning pins are used to fix the adjusting slider 13 to the base rod 3.

[0037] Furthermore, the segmented outer module is a lightweight, high-rigidity carbon fiber composite curved plate with an expansion coefficient close to that of the product, and the module side is provided with Z-shaped splicing steps to facilitate quick splicing and positioning.

[0038] Furthermore, a method for molding a linerless composite material storage tank, comprising the following steps using an umbrella-shaped telescopic molding die: Step 1: Connect the segmented outer module of the segmented outer mold assembly 2 to the radial telescopic connecting rod 11 of the end cap according to the tooling drawings, and then assemble the umbrella-shaped support frame 1. Step 2: Sequentially mount the umbrella-shaped support frame 1 of the front end cap segmented outer module 21, the cylindrical segmented outer module 22, and the rear end cap segmented outer module 23 onto the base rod 3 and unfold them into place. Use the outer mold locking device 5 to accurately position and lock the segmented outer modules. Use the positioning pin to position the adjusting slider 13 on the base rod 3 to form the winding core mold. Step 3: Install the mandrel onto the winding or laying equipment, wind or lay up the fibers according to the product requirements, and heat and cure after molding; Step 4: After curing, remove the mold from the product. The specific demolding steps are as follows: S1: Remove the pivots on base rod 3 from both ends; S2: Pull out the positioning pins of the front and rear section adjustment sliders 13 and base rod 3 to release the lock between the adjustment sliders 13 and base rod 3; use the steel cable to pull out the locking pin 52 on the outer mold locking device 5 to release the lock between the outer modules; use the steel cable to pull out the quick release device fixing pin 16, and the quick release slider locking device 15 pops out by itself to release the lock between the adjustment sliders 13 and base rod 3. S3: The adjusting screw 4 is inserted into the end hole of the base rod 3 and screwed into the threaded sleeve 14. The limiting flange is installed on the adjusting screw 4 as required. Then, the adjusting screw 4 is rotated to move the threaded sleeve 14 along the base rod 3 to the outside of the storage tank, which drives the telescopic connecting rod on the adjusting slider 13 to retract, separating the front and rear segmented outer mold assembly 2 from the product and stacking them together. Then, this part of the mold is pulled out from the end hole of the product. S4: Repeat step S3 to radially shrink the umbrella-shaped support frame 1 with the segmented outer module connected to the cylindrical section, separate the mold from the product and stack them together. First, shrink and remove the inner mold 231 of the segmented outer module of the rear end cap, then shrink and remove the outer mold 232 of the segmented outer module of the rear end cap. Then, in the same manner, alternately shrink and move the inner mold 211 of the segmented outer module of the front end cap, the outer mold 212 of the segmented outer module of the front end cap, the inner mold 221 of the segmented outer module of the cylindrical section, and the outer mold 222 of the segmented outer module of the cylindrical section. After shrinking, together with the base rod 3, pull it out from the end hole of the product to complete the demolding and obtain the composite material storage tank product 6.

[0039] The basic embodiments of this application have been described above. The following describes the application in more detail with reference to preferred embodiments and / or variations of the basic embodiments.

[0040] like Figure 1 , Figure 2 As shown in the illustration, this embodiment further describes a telescopic umbrella-shaped molding die and molding method for a linerless composite material storage tank: A linerless carbon fiber and glass fiber hybrid composite material storage tank has a main body wall thickness of 5mm, an outer envelope dimension of φ2000mm×1500mm, and front and rear end holes of φ900mm. A telescopic umbrella-shaped molding die for this product was designed, its structure including an expandable umbrella-shaped support frame 1, a segmented outer mold assembly 2, a base rod 3, and an adjusting screw 4, as shown in the illustration. Figure 1 and Figure 2As shown. The base rod 3 has external dimensions of 120mm×120mm×3000mm and a wall thickness of 15mm. It has 40mm wide grooves on both sides and a φ10 positioning pin hole at the positioning position with the adjusting slider 13. The adjusting slider 13 is a block structure with a 100×100mm square hole in the center and a hinge ear structure on the outside. Its external dimensions are φ400mm×50mm. It has two φ10 positioning pin holes at the positioning position with the base rod 3 and 6-φ6 through holes at the connection with the threaded sleeve 14. The threaded sleeve 14 is a disc with an M40 threaded hole in the center and a 2-40mm boss on the outside, measuring φ90mm×50mm. It is installed inside the base rod 3 and fixed to the adjusting slider 13 by 4-M6 screws and 2-φ6 pins. The telescopic connecting rod is an Invar rod with φ10 hinge holes at both ends, and its length is prepared according to the model. The radial telescopic connecting rod 12 of the cylinder section is combined into an X-shape, and the front and rear telescopic connecting rods are combined into a Y-shape. The telescopic extension and retraction of the connecting rod is controlled by adjusting the distance between a pair of adjusting sliders 13. The segmented outer mold assembly 2 includes a front end cap segmented outer module 21, a cylinder section segmented outer module 22, and a rear end cap segmented outer module 23. Each outer module is divided into two groups circumferentially, with the structure as follows: Figure 1 and Figure 2 As shown, in the folded state, the two layers are stacked in a petal shape. The outer petal modules are made of carbon fiber composite material or honeycomb sandwich curved plates, and their outer curved surfaces are the same as the inner curved surfaces of the product. The inner side is provided with φ10 hinge holes for connecting rods. Z-shaped splicing steps are provided on the sides of the outer petal modules. The splicing step surface of the outer petal module located in the priority demolding position is set from the outside to the inside in the radial direction, and the splicing step surface of the outer petal module located in the subsequent demolding position is set from the inside to the outside in the radial direction. Two outer mold locking devices 5 are installed at each splice seam of the outer petal modules to fix the relative positions of the petal modules.

[0041] The molding steps for the storage tank product are as follows: Step 1: Connect the segmented outer module of the segmented outer mold assembly 2 to the radial telescopic connecting rod of the end cap according to the tooling drawings, and then assemble the umbrella-shaped support frame 1; Step 2: Sequentially mount the umbrella-shaped support frame 1 of the segmented outer module 21 of the front end cap, the segmented outer module 22 of the cylinder section, and the segmented outer module 23 of the rear end cap onto the base rod 3 and unfold them into place. Use the outer mold locking device 5 to accurately position and lock the segmented outer module. Use the positioning pin to position the adjusting slider 13 on the base rod 3 to form the winding core mold. Step 3: Install the mandrel onto the winding or laying equipment, wind the fibers according to the product requirements, and heat-cure after molding; Step 4: After curing, remove the rotating shaft from both ends of the base rod 3. Then, remove the adjusting sliders 13 of the front and rear sections and the positioning pins of the base rod 3. Use the outer steel cable to pull out the locking pin 52 on the outer mold locking device 5 to release the locking of the connecting rod and the outer module. Use the steel cable to pull out the quick-release device fixing pin 16, and the quick-release slider locking device 15 will pop out automatically, releasing the lock between the adjusting slider 13 and the base rod 3. Then, insert the adjusting screw 4 into the end hole of the base rod 3 and screw it into the threaded sleeve 14. Install the limiting flange on the adjusting screw 4, and then continue to rotate the adjusting screw 4 to move the threaded sleeve 14 along the base rod 3 towards the storage. The outer side of the box moves, causing the telescopic connecting rod on the adjusting slider 13 to retract, sequentially retracting and removing the inner layer mold 231 and the outer layer mold 232 of the rear end cap segmented outer module; then, in the same way, sequentially removing the inner layer mold 211 and the outer layer mold 212 of the front end cap segmented outer module on the other side; finally, alternately retracting and moving the inner layer mold 221 and the outer layer mold 222 of the cylindrical segmented outer module to achieve mold retraction and stacking, and finally pulling this part out together with the base rod 3 from the product end hole to complete demolding, obtaining the composite material storage tank product 6.

[0042] This invention utilizes lightweight composite materials to fabricate segmented outer mold components, achieving mold weight reduction. A metal umbrella-like structure is designed as the supporting frame, and a screw mechanism enables the mold to unfold and retract, effectively reducing the complexity of mold assembly and disassembly. An outer mold locking device ensures the assembly accuracy of the segmented outer molds, improving the overall mold's reusability. This invention guarantees the cleanliness of the tank's internal cavity during molding, enabling efficient and high-quality molding of large-sized, liner-less composite material tanks. This mold can be widely applied to the manufacturing of other aerospace-grade winding and three-dimensional braiding structural components.

[0043] Testing revealed that the umbrella-shaped telescopic molding die prepared using this mold and method reduces product weight by approximately 30% compared to conventional segmented metal core molds, reduces mold assembly and demolding time by more than 50%, and ensures that the accuracy deviation of the mold after repeated assembly meets product requirements. The produced product has a smooth interior and the internal cavity shape meets design requirements.

[0044] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0045] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. An innerlinerless composite material storage tank umbrella type stretch forming die, characterized by, include: Umbrella-shaped support frame (1), segmented outer mold assembly (2), base rod (3), adjusting screw (4), and outer mold locking device (5); The umbrella-shaped support frame (1) is set on the base rod (3) to achieve axial movement. The adjusting screw (4) is set inside the base rod (3). The rotation of the adjusting screw (4) can realize the unfolding and retraction of the umbrella-shaped support frame (1). The telescopic connecting rod of the umbrella-shaped support frame (1) is connected to the segmented outer mold assembly (2), which can control the segmented outer mold assembly (2) to unfold or retract. The outer mold locking device (5) is installed at the splicing position of the segmented outer module, which can accurately position the relative positions of the segmented outer mold components (2); The umbrella-shaped support frame (1) includes a head radial telescopic connecting rod (11), a cylinder section radial telescopic connecting rod (12), an adjusting slider (13), a threaded sleeve (14), a quick-release slider locking device (15), and a quick-release device fixing pin (16). The threaded sleeve (14) of the umbrella-shaped support frame (1) is installed and fixed at the center of the adjusting slider (13). The adjusting slider (13) is fitted on the base rod (3). One end of the radial telescopic connecting rod (12) of the cylinder section is hinged to the adjusting slider (13), and the other end is hinged to the split outer mold assembly (2). By adjusting the rotation of the screw (4), the threaded sleeve (14) is guided to undergo axial displacement, thereby realizing the unfolding and retraction of the umbrella-shaped support frame (1). The quick-release slider locking device (15) is inserted into the positioning hole of the adjusting slider (13), and the quick-release slider locking device (15) is fixed by the quick-release device fixing pin (16) to complete the position locking of the adjusting slider (13) and the base rod (3), thereby realizing the positioning and fixing of the umbrella-shaped support frame (1).

2. The no-innerliner composite material tank umbrella-type stretch-draw mold of claim 1, wherein, The segmented outer mold assembly (2) includes a front end cap segmented outer module (21), a cylindrical section segmented outer module (22), and a rear end cap segmented outer module (23); each segmented outer module is hinged to a telescopic connecting rod, and the shape of the segmented outer mold assembly (2) after unfolding is consistent with the inner surface of the storage tank. The segmented outer mold assembly (2) has 2 to 6 segments of segmented modules. Each segmented module is hinged to a pair of adjusting sliders (13) via a radial telescopic connecting rod (12) of the cylindrical section. The radial telescopic connecting rods (12) of the cylinder segment connected to the outer module of each segment are circumferentially misaligned to ensure that each segment can be axially pulled out through the end hole of the storage tank after it is retracted.

3. The umbrella-shaped telescopic molding die for an unlined composite material storage tank according to claim 2, characterized in that, The front end cap segmented outer module (21) includes the front end cap segmented outer module inner layer mold (211) and the front end cap segmented outer module outer layer mold (212); The cylindrical segmented outer module (22) includes the inner layer mold (221) of the cylindrical segmented outer module and the outer layer mold (222) of the cylindrical segmented outer module; The rear end cap segmented outer module (23) includes the rear end cap segmented outer module inner layer mold (231) and the rear end cap segmented outer module outer layer mold (232). When demolding, the following molds are sequentially pulled out: the inner mold of the rear end cap segment outer module (231), the outer mold of the rear end cap segment outer module (232), the inner mold of the front end cap segment outer module (211), the outer mold of the front end cap segment outer module (212), the inner mold of the cylindrical segment segment outer module (221), and the outer mold of the cylindrical segment segment outer module (222).

4. The umbrella-shaped telescopic molding die for an unlined composite material storage tank according to claim 1, characterized in that, The adjusting screw (4) is installed inside the base rod (3) and is a screw with a limiting flange in the middle. It controls the threaded sleeve (14) to move axially by rotating.

5. The umbrella-shaped telescopic molding die for an unlined composite material storage tank according to claim 1, characterized in that, The base rod (3) is a grooved metal square tube with flange holes at both ends for connecting to the shaft of the winding machine; The base rod (3) and the adjusting slider (13) are provided with positioning pin holes. When the mold extends to the set position, the positioning pins are used to fix the adjusting slider (13) and the base rod (3).

6. The umbrella-shaped telescopic molding die for an unlined composite material storage tank according to claim 1, characterized in that, The outer mold locking device (5) is mainly composed of a locking pin (51) and a locking body pin (52) that can be quickly removed. It is installed at the splice position of the split outer module to accurately position the relative positions of the split outer mold components (2). The outer mold locking device (5) is set at 2 to 4 points on each seam of the segmented outer module.

7. The umbrella-shaped telescopic molding die for an unlined composite material storage tank according to claim 1, characterized in that, The segmented outer mold assembly (2) is a carbon fiber composite curved plate with an expansion coefficient close to that of the product, and the side of the module forms a Z-shaped splicing step to facilitate quick splicing and positioning. The splicing step surface of the segmented outer mold located in the priority demolding section is set from the outside to the inside in the radial direction, while the splicing step surface of the segmented outer mold located in the subsequent demolding section is set from the inside to the outside in the radial direction.

8. A molding method for a linerless composite material storage tank umbrella-shaped telescopic mold, characterized in that, The method of using the umbrella-shaped telescopic molding die for an unlined composite material storage tank according to any one of claims 1 to 7 includes the following steps: Step 1: Connect the segmented outer module of the segmented outer mold assembly (2) to the radial telescopic connecting rod (11) of the end cap according to the tooling drawings, and then assemble the umbrella-shaped support frame (1). Step 2: Sequentially mount the umbrella-shaped support frame (1) of the front end cap segmented outer module (21), the cylindrical segmented outer module (22), and the rear end cap segmented outer module (23) onto the base rod (3) and unfold them into place. Use the outer mold locking device (5) to accurately position and lock the segmented outer module. Use the positioning pin to position the adjusting slider (13) on the base rod (3) to form a winding core mold. Step 3: Install the mandrel onto the winding or laying equipment, wind or lay up the fibers according to the product requirements, and heat and cure after molding; Step 4: After curing, remove the mold from the product.

9. The molding method of the umbrella-shaped telescopic mold for an unlined composite material storage tank according to claim 8, characterized in that, Step four includes the following steps: S1: Remove the pivots on the base rod (3) from both ends; S2: Pull out the positioning pins of the front and rear adjusting sliders (13) and the base rod (3) to release the lock between the adjusting slider (13) and the base rod (3); use the steel cable to pull out the locking pin (52) on the outer mold locking device (5) to release the lock between the outer modules; use the steel cable to pull out the quick release device fixing pin (16), and the quick release slider locking device (15) will pop out by itself to release the lock between the adjusting slider (13) and the base rod (3); S3: The adjusting screw (4) is inserted into the end hole of the base rod (3) and screwed into the threaded sleeve (14). The limiting flange is installed on the adjusting screw (4) as required. Then, the adjusting screw (4) is rotated to move the threaded sleeve (14) along the base rod (3) to the outside of the storage tank, causing the telescopic connecting rod on the adjusting slider (13) to retract, separating the front and rear segmented outer mold assembly (2) from the product and stacking them together. Then, this part of the mold is pulled out from the end hole of the product. S4: Repeat step S3 to radially shrink the umbrella-shaped support frame (1) with the segmented outer module connected to the cylinder section, separate the mold from the product and stack them together. First, gather and remove the inner mold (231) of the segmented outer module of the rear end cap, then gather and remove the outer mold (232) of the segmented outer module of the rear end cap. Then, in the same way, alternately gather and move the inner mold (211), outer mold (212), inner mold (221), and outer mold (222) of the segmented outer module of the front end cap, the front end cap, the segmented outer module of the front end cap, the cylinder section, and the cylinder section, the segmented outer module of the cylinder section, together with the base rod (3) from the end hole of the product to complete the demolding and obtain the composite material storage tank product (6).

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