Multi-wire nozzle and grid bearing cylinder body forming process

Abstract

The invention discloses a multi-yarn nozzle which comprises a supporting frame, a polytetrafluoroethylene roller and a fiber comb. The support frame is used for supporting the polytetrafluoroethylene roller; a plurality of polytetrafluoroethylene rollers are arranged; the polytetrafluoroethylene roller is in a hourglass shape or a cylindrical shape; and the fiber tows pass through the fiber comb and then enter the polytetrafluoroethylene roller, so that the oblique ribs, the annular ribs, the upper end frame and the lower end frame in the grid bearing cylinder body are wound and formed. The invention further discloses a grid bearing cylinder body forming process. The grid bearing cylinder body forming process comprises the steps that the grid bearing cylinder body forming mold is assembled; winding of the inclined ribs, the annular ribs, the upper end frame and the lower end frame is achieved through multiple wire nozzles; and curing and molding a product obtained by winding, and then removing the mold. Through the machining of winding the grid bearing cylinder with the multiple wire nozzles, on the premise that the forming quality is guaranteed, the forming efficiency of the grid bearing cylinder body can be effectively improved, and wide application prospects are achieved.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology and relates to a molding process for a multi-wire nozzle and a mesh load-bearing cylinder body. Background Technology To meet the requirements of lightweight, high load-bearing capacity, and mass production for spacecraft, their main load-bearing structures often adopt a hollowed-out mesh-like cylindrical structure. The main body of the composite material mesh load-bearing cylinder consists of composite material ribs arranged in a regular circumferential and helical direction, with the helical ribs being 6mm wide, the middle circumferential ribs being 3mm wide, and the circumferential ribs at both ends being 20mm wide.

[0002] In the current process of molding the grid-supported cylinder, high-modulus carbon fiber is mainly used for integrated winding to ensure the continuity of the grid cylinder fibers and its comprehensive mechanical properties. Conventional grid cylinder winding requires high precision in the winding line and trajectory. The winding line needs to be specially designed to ensure continuous winding of 32 diagonal ribs and 13 circumferential ribs. Simultaneously, the precision of the winding trajectory is adjusted multiple times during the winding process as the layup thickness increases to ensure the quality of the ribs. These factors result in low winding efficiency for the grid cylinder. Currently, single-filament winding is used, with an average winding cycle of 20 days per grid cylinder. During this period, the resin cure degree varies in different layup sections, leading to significant internal stress generation during the overall curing process of the grid cylinder, affecting the overall quality. Therefore, optimization of the molding process technology is needed to improve the molding quality and efficiency of the grid cylinder. Summary of the Invention

[0003] The purpose of this invention is to overcome the aforementioned defects and provide a multi-needle nozzle and mesh load-bearing cylinder body forming process, solving the technical problem of difficulty in improving the forming quality and production efficiency of mesh load-bearing cylinders. This invention, through the processing of mesh load-bearing cylinders using a multi-needle nozzle, can effectively improve the forming efficiency of mesh load-bearing cylinder bodies while ensuring forming quality, and has broad application prospects.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution: A multi-filament nozzle, characterized in that it comprises: a support frame, a PTFE roller, and a fiber comb; The support frame is used to support the PTFE roller; There are several PTFE rollers; PTFE rollers are hourglass-shaped or cylindrical; After passing through a fiber comb, the fiber bundles enter the PTFE rollers to achieve the winding and forming of the oblique ribs, circumferential ribs, upper frame, and lower frame in the mesh load-bearing cylinder body.

[0005] Furthermore, when winding the oblique and circumferential ribs in the mesh support cylinder body, an hourglass-shaped PTFE roller is used to concentrate the fiber bundles in the middle of the rib grooves of the mesh support cylinder body forming mold.

[0006] Furthermore, when winding the upper and lower frames of the mesh support cylinder body, cylindrical PTFE rollers are used to wind multiple yarns side by side in the same groove.

[0007] Furthermore, when winding the oblique and circumferential ribs in the mesh support cylinder body, multiple PTFE rollers are used simultaneously, with multiple PTFE rollers corresponding to multiple rib grooves. During winding, multiple yarns are located in different grooves and are wound simultaneously. When winding the upper and lower frames of the mesh load-bearing cylinder body, a PTFE roller is used.

[0008] Furthermore, when winding the inclined and circumferential ribs in the mesh support cylinder body, the PTFE roller is perpendicular to the rib grooves.

[0009] Furthermore, the motor drives the support frame to rotate, which in turn drives several PTFE rollers to rotate simultaneously, thereby achieving multi-needle nozzle angle adjustment.

[0010] A process for forming a mesh load-bearing cylinder body includes: Assemble the mold for forming the main body of the grid load-bearing cylinder; The above-mentioned multi-wire nozzle is used to achieve the winding of oblique ribs, circumferential ribs, upper frame and lower frame; The product obtained by winding is cured and molded, and then the mold is removed.

[0011] Furthermore, the forming mold for the grid-supported cylinder body includes a metal core mold and a silicone rubber soft mold; The metal core mold is placed inside the silicone rubber soft mold to support the silicone rubber soft mold; The silicone rubber mold has grooves for wrapping the reinforcing bars and end frames.

[0012] Compared with the prior art, the present invention has at least one of the following advantages: (1) The mesh load-bearing cylinder body of the present invention adopts a high-modulus carbon fiber high-tension multi-yarn winding molding process, which realizes high mechanical performance and high-precision molding of large mesh load-bearing cylinder body; (2) The multi-yarn flexible winding nozzle design method adopted in this invention realizes the high-efficiency forming of the large mesh load-bearing cylinder body and significantly shortens the production cycle of the mesh cylinder body; (3) The multi-yarn flexible winding nozzle design method adopted in this invention shortens the resin pre-reaction time and reduces the internal stress of the overall curing of the mesh cylinder while improving molding efficiency, thus significantly improving the molding quality of the mesh cylinder body. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the oblique rib multi-yarn winding of the present invention; Figure 2This is a schematic diagram of the circumferential rib multi-yarn winding of the present invention; Figure 3 This is a schematic diagram of the upper and lower end frames of the present invention with multiple yarns wound around them; Figure 4 This is a schematic diagram of the multi-yarn nozzle of the present invention; Figure 5 This is a schematic diagram of the cylindrical PTFE roller of the present invention; Figure 6 This is a schematic diagram of monofilament bundle winding in the prior art; Figure 7 This is a schematic diagram of the quick-release device of the present invention. Detailed Implementation

[0014] The features and advantages of the present invention will become clearer and more apparent from the following detailed description.

[0015] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0016] like Figure 1 This invention provides a molding process for a grid-supported cylinder body 1, which is the main load-bearing structure of a spacecraft and mainly consists of diagonal ribs 2, circumferential ribs 3, a lower frame 4, and an upper frame 5. The diagonal ribs 2 provide the main load-bearing capacity of the cylinder, the circumferential ribs 3 maintain the stability of the grid-supported cylinder body, the lower frame 4 provides a docking interface with the spacecraft via a docking frame, and the upper frame 5 provides a top plate connection interface. To ensure the molding quality and production efficiency of the grid-supported cylinder body, the diagonal ribs 2, circumferential ribs 3, lower frame 4, and upper frame 5 are all made of high-modulus carbon fiber 7 with multiple threads wound around multi-thread nozzles 6, ultimately achieving non-autoclave curing molding.

[0017] The main body of the grid load-bearing cylinder 1 is formed by using a grid forming mold, which includes a metal core mold and a silicone rubber soft film. A grid-like groove is formed on the surface of the soft film. A winding process is adopted, and the fiber path is designed so that the impregnated fibers continuously enter multiple soft film grooves and wind until the grooves are full. Then, it is cured and formed in an oven. Finally, the silicone rubber soft mold is destroyed and the formed grid load-bearing cylinder body is removed. like Figure 2 and Figure 3 The diagonal rib 2 is 6mm wide and 10mm thick. It is made of high-modulus carbon fiber filaments impregnated with resin and wound at a certain angle along the groove of the soft mold. During the winding process, multiple yarns are located in different grooves and wound simultaneously to improve the mesh winding efficiency.

[0018] The circumferential rib 3 is 3mm wide and 10mm thick. It is formed by wrapping high-modulus carbon fiber filaments impregnated with resin along the groove of the soft mold at 90 degrees. During the wrapping process, multiple yarns are located in different grooves and are wrapped simultaneously to improve the mesh wrapping efficiency.

[0019] The lower frame 4 is 20mm wide and 10mm thick. It is formed by wrapping high-modulus carbon fiber filaments impregnated with resin along the groove of the soft film mold at a 90-degree angle. During the wrapping process, multiple yarns are located in the same groove and wrapped side by side to improve the mesh wrapping efficiency.

[0020] The upper frame 5 is 20mm wide and 10mm thick. It is formed by winding high-modulus carbon fiber filaments with resin impregnation along the groove of the soft film mold at a 90-degree angle. During winding, multiple yarns are located in the same groove and wound side by side to improve the mesh winding efficiency.

[0021] like Figure 4 and Figure 5 The system features a multi-needle winding mechanism for high-modulus carbon fiber (6-thread) with multiple yarns. The shape of the needles can be adjusted to suit different winding methods. When winding oblique and circumferential ribs, adjusting the spacing between the needles ensures that the high-modulus carbon fiber from different needles enters different soft mold grooves, allowing multiple ribs to be wound simultaneously. When winding the upper and lower end frames, one needle can be used, with the outermost PTFE roller of the needle changed to a cylindrical shape. This allows different bundles of high-modulus carbon fiber to pass through different gaps in the comb, increasing the fiber winding pitch and effectively improving the winding rate. Simultaneously, the winding path is simulated using winding programming software, and by adjusting the angle of each needle relative to the soft mold groove, high-precision winding of the mesh ribs is achieved.

[0022] The modulus of high-modulus carbon fiber is 370 GPa to 550 GPa.

[0023] The specific steps are as follows: (1) Mold preparation Prepare a grid cylinder core mold and a silicone rubber soft mold, and assemble the soft mold onto the core mold.

[0024] (2) Winding line programming Before winding the mesh cylinder, a winding program is woven according to the structural characteristics of the mesh cylinder, and continuous winding of circumferential ribs, diagonal ribs, and upper and lower end frames is achieved through line design.

[0025] (3) Adjustment of the nozzle Before winding the reinforcing bars in each direction, the nozzles of the winding equipment must be adjusted. When winding in the circumferential and oblique directions, use multiple nozzles and adjust the angle of the nozzles so that they are perpendicular to the direction of the soft mold groove. When winding the end frame, use a single nozzle and pass the carbon fiber through different gaps in the comb to ensure fiber connection and increase the winding pitch.

[0026] (4) Winding According to the set winding pattern, high-modulus carbon fiber is used to wind and form a mesh cylinder. During the process, the nozzle needs to be adjusted according to the characteristics of different ribs to achieve high-tension multi-yarn winding of high-modulus carbon fiber.

[0027] Existing monofilament winding technology, such as Figure 6 As shown by the red line, the filament bundle first winds to the right along the mesh tube ribs, then changes a certain angle at the end, then winds to the left, then changes a certain angle at the left end, and then winds to the right, ensuring that all 32 diagonal ribs are wound in place. This process has two problems. One is that when changing the angle at the end, in order to ensure that the high modulus fiber does not break (high modulus carbon fiber is extremely brittle, and if the angle change is too large, the yarn will break, and the winding process of this layer needs to be repeated), the mesh tube mold needs to be rotated more than 120° at the same time when the filament nozzle changes the angle, which wastes a lot of fiber and has low production efficiency. The other is that in order to ensure that all 32 diagonal ribs are wound once, it is necessary to wind the odd-numbered ribs and even-numbered ribs separately (number the 32 ribs, and in order to make the winding line continuous, wind the odd-numbered ribs first, then change the overall angle, and then wind the even-numbered ribs).

[0028] The advantages of using multi-needle winding are twofold: First, the needle itself at the end of the mesh cylinder has an angle adjustment process (the needle rotates in the middle, and the yarns at different positions are in a dynamic balancing process on their PTFE rollers, adjusting to a suitable angle together), which makes the high-modulus carbon fiber transition more smoothly, reduces the risk of yarn breakage, and saves fiber consumption and improves winding efficiency; Second, the winding needle involves the simultaneous winding of multiple continuous ribs, so there is no need to distinguish between odd and even number of ribs, and they are all wound in place at the same time.

[0029] For replacing different PTFE rollers, the support frame is common; only the PTFE roller itself needs to be replaced. The PTFE roller shaft and support frame use a quick-release connector for easy replacement. Figure 7 The center disc is a quick-release device; pulling it to the right allows for disassembly, while pulling it to the left allows for installation.

[0030] (5) Curing and molding Finally, it is cured and shaped in an oven.

[0031] Example: The mesh load-bearing cylinder body is the main load-bearing structure of the spacecraft. According to the requirements of lightweight, high performance and mass production of spacecraft, the high-modulus carbon fiber high-tension multi-yarn winding molding process is the optimal path to achieve this requirement.

[0032] First, a mesh cylinder core mold and a silicone rubber soft mold are prepared, and the soft mold is assembled onto the core mold. Before winding the mesh cylinder, a winding program is woven according to the structural characteristics of the mesh cylinder, and continuous winding of circumferential ribs, oblique ribs, and upper and lower end frames is achieved through line design. Before winding the ribs in each direction, the nozzles of the winding equipment need to be adjusted. Multiple nozzles are used for circumferential and oblique winding, and the angle of the nozzles is adjusted so that the nozzles are perpendicular to the direction of the grooves in the soft mold; a single nozzle is used for end frame winding, and the carbon fiber is passed through different gaps in the comb to ensure fiber alignment and increase the winding pitch. Then, according to the set winding line, high-modulus carbon fiber is used to wind and form the mesh cylinder. During the process, the nozzles need to be adjusted according to the characteristics of different ribs to achieve multi-yarn winding of high-modulus carbon fiber. Finally, it is cured and formed in an oven. The winding cycle of the prior art is 20 days, while the winding cycle of the method of this invention is 5 days, significantly shortening the winding cycle.

[0033] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

[0034] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A multi-filament nozzle characterized by, The application relates to a multi-silk nozzle for winding a slanting rib, a ring rib, an upper end frame and a lower end frame. The support frame is used for supporting the four-fluorine roller. The four-fluorine roller is a plurality of. The four-fluorine roller is in the shape of a sandglass or a cylinder. After the fiber bundle passes through the fiber comb, the fiber bundle enters the four-fluorine roller, so that the slanting rib, the ring rib, the upper end frame and the lower end frame in the grid supporting cylinder body are wound and formed. When the slanting rib and the ring rib in the grid supporting cylinder body are wound, the sandglass-shaped four-fluorine roller is adopted, so that the fiber bundle is concentrated in the middle of the rib groove of the grid supporting cylinder body forming die.

2. A multi-filament nozzle as claimed in claim 1, wherein When the upper end frame and the lower end frame in the grid supporting cylinder body are wound, the cylindrical four-fluorine roller is adopted, so that a plurality of yarns are located in the same groove and are wound side by side.

3. A multi-filament nozzle as defined in claim 1, wherein When the slanting rib and the ring rib in the grid supporting cylinder body are wound, a plurality of four-fluorine rollers are simultaneously adopted, the plurality of four-fluorine rollers correspond to a plurality of rib grooves, and a plurality of yarns are simultaneously wound in different grooves.

4. A multi-filament nozzle as defined in claim 1, wherein When the upper end frame and the lower end frame in the grid supporting cylinder body are wound, one four-fluorine roller is adopted. When the slanting rib and the ring rib in the grid supporting cylinder body are wound, the four-fluorine roller is perpendicular to the rib groove.

5. A multi-lane die as defined in claim 1, wherein The support frame is driven to rotate by a motor, and then a plurality of four-fluorine rollers are simultaneously driven to rotate, so that the multi-silk nozzle angle is adjusted.

6. A multi-lane die as defined in claim 1, wherein The application relates to a multi-silk nozzle for winding a slanting rib, a ring rib, an upper end frame and a lower end frame.

7. A process for forming a lattice-based pressure vessel body, the process comprising: The application relates to a multi-silk nozzle for winding a slanting rib, a ring rib, an upper end frame and a lower end frame. The product obtained by winding is cured and formed, and then the die is removed. The grid supporting cylinder body forming die comprises a metal core die and a silicone rubber soft die. The metal core die is arranged in the silicone rubber soft die and is used for supporting the silicone rubber soft die.

8. A process for forming a lattice load bearing cylinder body as in claim 7 wherein, The silicone rubber soft die is provided with a groove for winding the rib and the end frame. ​ ​

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