Winding forming die for long and thin composite material round pipe

Abstract

The winding forming die for the long and thin composite material round pipe provides an effective solution for the winding forming process of the long and thin composite material round pipe; compared with an existing thin and long composite material round pipe winding forming die, the thin and long composite material round pipe winding forming die is provided with the conical yarn hanging sleeve, the problem that when a composite material round pipe is a thin and long pipe, due to the small shoulder width, yarn sliding occurs at the two ends can be effectively solved during winding, and it is ensured that the winding process can be achieved. In addition, compared with an existing composite material round pipe winding forming die, the composite material round pipe winding forming die is provided with the cutting gap, the surface of the core die is prevented from being scratched when the end socket is cut off, it is ensured that the core die can be repeatedly used while winding of the long and thin composite material round pipe is effectively achieved, cost is reduced, and the composite material round pipe winding forming die is suitable for industrial large-scale use and popularization.

Description

Technical Field

[0001] This utility model belongs to the field of composite material manufacturing, and specifically relates to a slender composite material circular tube winding molding die and its usage method. Background Technology

[0002] The forming of composite material cylindrical tubes mainly adopts the roll-up process. Typical products include antennas, fishing rods, and various structural components. These products have a common feature of having a large slenderness ratio, and are called slender composite material cylindrical tubes.

[0003] With increasing demands for the performance of slender composite cylindrical tubes, the stiffness and strength of composite cylindrical tubes manufactured using the lay-up process cannot meet the requirements. The main reason is that no tension is applied to the fiber yarn during the lay-up process, resulting in insufficient efficiency in utilizing the stiffness and strength of the fibers in the molded structural components.

[0004] Existing technologies include winding processes, which require a mandrel. The mandrel typically includes a transition clamping section, a cylindrical section, and a head. The outer diameter of the cylindrical section is generally determined by the structural requirements, while the outer diameter of the transition clamping section is related to the overall length of the mandrel and the winding speed, and is generally made as large as possible to allow for greater mandrel flexibility. However, this configuration results in a narrow shoulder width. According to winding principles and practice, when the shoulder width is less than 80mm, the composite yarn is prone to slippage and unraveling, leading to winding failure. For slender composite tubes used in structural components, a large proportion of the products have an outer diameter of less than 80mm, making it impossible to wind slender composite tubes using existing mandrels. Utility Model Content

[0005] The purpose of this invention is to provide a slender composite material cylindrical tube winding molding die and its usage method, so as to solve the problem that the composite material yarn is prone to slippage and unraveling in the winding process of the prior art, resulting in winding failure and the inability to complete the winding of slender composite material cylindrical tubes.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A slender composite material circular tube winding molding die includes a core mold and two yarn hanging sleeves;

[0008] The core mold has a cylindrical forming section in the middle, and cylindrical clamping sections are coaxially fixed to both ends of the forming section. The outer diameter of the clamping sections is smaller than that of the forming section.

[0009] The yarn hanging sleeve includes a gap section, a transition section, and a conical section. Both the gap section and the transition section are annular structures. The outer diameter of the gap section is smaller than that of the forming section, and the outer diameter of the transition section is equal to that of the forming section. The conical section is a cone-shaped structure, and its taper gradually decreases in the direction away from the outer diameter of the transition section.

[0010] The yarn hanging sleeve has a through hole along the central axis, and the diameter of the through hole matches the outer diameter of the clamping section; the two yarn hanging sleeves are detachably connected to the corresponding clamping sections;

[0011] The conical section near the forming section has multiple rings of yarn hanging holes arranged in parallel along the circumference. The central axis of each yarn hanging hole is perpendicular to the central axis of the core mold. Each yarn hanging hole is equipped with a yarn hanging nail, which extends outward from the conical section.

[0012] This utility model also has the following features:

[0013] Furthermore, the through hole is provided with an internal thread, and the clamping section is provided with a matching external thread; the two yarn hanging sleeves are respectively screwed onto the corresponding clamping sections.

[0014] Furthermore, the conical section has 2-4 rings of yarn hanging holes.

[0015] Furthermore, the axial length of the gap section of the yarn hanging sleeve is 2-5mm.

[0016] Furthermore, the fit between the yarn hanging hole and the yarn hanging pin is a clearance fit.

[0017] Compared with the prior art, this utility model has the following technical effects:

[0018] This invention provides an effective solution for the winding process of slender composite material tubes, including a winding die and its application method. Compared to existing winding dies, this invention features a conical yarn-hanging sleeve, which effectively prevents yarn slippage at the ends of the slender composite tube due to its narrow shoulder width, ensuring successful winding. Furthermore, compared to existing winding dies, this invention incorporates a cutting gap to prevent scratching the mandrel surface during end-cap removal. This ensures the mandrel can be reused multiple times while effectively winding the slender composite material tube, reducing costs and making it suitable for large-scale industrial use and promotion. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the slender composite material circular tube winding molding die of this utility model;

[0020] Figure 2 This is a schematic diagram of the core mold structure in this utility model;

[0021] Figure 3 This is a schematic diagram of the yarn hanging sleeve structure in this utility model;

[0022] Figure 4 This is a schematic diagram of the yarn-hanging nail structure in this utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the yarn hanging nail installed on the yarn hanging sleeve in this utility model.

[0024] The meanings of the labels in the diagram are as follows: 1. Core mold; 2. Yarn hanging sleeve; 3. Forming section; 4. Clamping section; 5. Gap section; 6. Transition section; 7. Conical section; 8. Yarn hanging hole; 9. Yarn hanging nail. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, all components in this utility model are known components in the prior art. For example, the yarn-hanging nails are commonly known yarn-hanging nails.

[0026] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0027] like Figures 1 to 5 As shown, a slender composite material circular tube winding molding die includes a core mold 1 and two yarn hanging sleeves 2;

[0028] The core mold 1 has a cylindrical forming section 3 in the middle. Both ends of the forming section 3 are coaxially fixedly connected to cylindrical clamping sections 4, and the outer diameter of the clamping sections 4 is smaller than that of the forming section 3.

[0029] The yarn hanging sleeve 2 has a through hole along the central axis. The diameter of the through hole matches the outer diameter of the clamping section 4. The two yarn hanging sleeves 2 can be detachably connected to the corresponding clamping section 4.

[0030] The yarn hanging sleeve 2 includes a gap section 5, a transition section 6 and a conical section 7. The gap section 5 and the transition section 6 are both annular structures. The outer diameter of the gap section 5 is smaller than the outer diameter of the forming section 3, and the outer diameter of the transition section 6 is equal to the outer diameter of the forming section (3). The conical section 7 is a cone-shaped structure, and its taper gradually decreases along the direction away from the outer diameter of the transition section 6.

[0031] Multiple rings of yarn hanging holes 8 are arranged in parallel along the circumference of the conical segment 7 near the forming segment 3. The central axis of each yarn hanging hole 8 is perpendicular to the central axis of the core mold 1. A yarn hanging nail 9 is installed in each yarn hanging hole 8, and the yarn hanging nail 9 extends outward from the conical segment 7.

[0032] It should be noted that those skilled in the art are capable of determining which composite material tubes are "slender" based on relevant knowledge in the art, and are able to use the slender composite material tube winding mold provided in this embodiment to perform winding operations according to actual needs.

[0033] exist Figure 1 The length of the given core mold 1 is relatively short for demonstration purposes. In actual work, the length of this core mold is usually longer.

[0034] Due to the presence of the gap section, a certain gap is formed between the core mold 1 and the yarn hanging sleeve 2. Specifically, the axial length of the gap section 5 of the yarn hanging sleeve 2 is 2-5mm.

[0035] As a preferred embodiment, the through hole is provided with an internal thread, and the clamping section 4 is provided with a matching external thread; the two yarn hanging sleeves 2 are respectively screwed onto the corresponding clamping section 4, which facilitates disassembly while improving the connection strength.

[0036] Specifically, the conical section 7 has 2-4 rows of yarn hanging holes 8. This number selection is beneficial for the forming of slender composite material round tubes.

[0037] The yarn hanging hole 8 and the yarn hanging nail 9 are fitted with a clearance fit, which facilitates loading and unloading.

[0038] The following is a specific implementation method of this embodiment, including the following steps:

[0039] Step 1: Screw the core mold 1 and two hanging yarn sleeves 2 to form a molding die for winding a slender composite material tube;

[0040] Step 2: Set the entire forming mold on the external winding machine, and use the winding machine to drive the slender forming mold to rotate circumferentially along the central axis;

[0041] Step 3: Use an external winding machine nozzle to carry the composite material yarn and make it reciprocate along the axial direction of the forming mold; let the composite material yarn pass through each hanging nail 9 in sequence until a slender composite material tube to be processed is formed.

[0042] During the reciprocating motion, the external winding thread tip folds back at the ends of the two clamping sections 4 of the core mold 1; the speed of the external winding thread tip movement matches the rotation speed of the forming mold.

[0043] During operation, as the winding machine tip moves in the opposite direction, the composite yarn gradually slides from the top of the hanging nail 9 to the root. This process is repeated to ensure that the composite yarn is securely attached.

[0044] Step 4: Curing the slender composite material tube to be processed, and demolding after curing to complete the forming of the slender composite material tube.

[0045] It should be noted that the winding process is a process that already exists in the prior art and is not within the scope of discussion of this embodiment. This embodiment will not elaborate on the process of forming slender composite material round tubes by working together with the external winding machine nozzle and the external winding machine.

[0046] Those skilled in the art are capable of adjusting the operating speed of the external winding machine nozzle and the external winding machine based on relevant knowledge in the art to achieve the winding and forming of slender composite material tubes. Composite material yarn is also a commonly used device known in the prior art and will not be described in detail here.

[0047] As a preferred option, when demolding the slender composite material tube, it is cut along the gap section 5 between the two hanging yarn sleeves 2.

Claims

1. A slender composite material circular tube winding molding die, characterized in that, Includes a core mold (1) and two yarn hanging sleeves (2); The core mold (1) has a cylindrical forming section (3) in the middle. Both ends of the forming section (3) are coaxially fixedly connected to cylindrical clamping sections (4). The outer diameter of the clamping section (4) is smaller than that of the forming section (3). The hanging yarn sleeve (2) includes a gap section (5), a transition section (6) and a conical section (7). The gap section (5) and the transition section (6) are both annular structures. The outer diameter of the gap section (5) is smaller than the outer diameter of the forming section (3), and the outer diameter of the transition section (6) is equal to the outer diameter of the forming section (3). The conical section (7) is a cone-shaped structure, and its taper gradually decreases along the direction away from the outer diameter of the transition section (6). The yarn hanging sleeve (2) has a through hole along the central axis, and the diameter of the through hole matches the outer diameter of the clamping section (4); the two yarn hanging sleeves (2) are detachably connected to the corresponding clamping section (4); The conical segment (7) has multiple rings of yarn hanging holes (8) arranged in parallel along the circumference near the forming segment (3). The central axis of each yarn hanging hole (8) is perpendicular to the oblique conical surface of the conical segment (7). Each yarn hanging hole (8) is equipped with a yarn hanging nail (9), which extends outward from the conical segment (7).

2. The slender composite material circular tube winding molding die as described in claim 1, characterized in that, The through hole is provided with an internal thread, and the clamping section (4) is provided with a matching external thread; the two hanging yarn sleeves (2) are respectively screwed onto the corresponding clamping section (4).

3. The slender composite material circular tube winding molding die as described in claim 2, characterized in that, The conical section (7) is provided with 2-4 rings of yarn hanging holes (8).

4. The slender composite material circular tube winding molding die as described in claim 3, characterized in that, The axial length of the gap section (5) of the yarn hanging sleeve (2) is 2-5mm.

5. The slender composite material circular tube winding molding die as described in claim 4, characterized in that, The yarn hanging hole (8) and the yarn hanging nail (9) are fitted with a clearance fit.

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