A method for controlling the yarn path of a rotating preform

Abstract

This invention relates to the field of preform molding technology, and particularly to a method for controlling the yarn path of a rotary preform. In this technical solution, the warp and weft yarn paths are controlled by controlling the weave shape of the preform. The weave shape is determined by the first tension and direction of the warp yarn to be wound, the second tension and direction of the weft yarn to be wound, and the relative displacement of the heights of adjacent weft yarn layers. Therefore, by controlling the above process parameters, the accuracy of yarn path control can be improved. This effectively controls the interlayer density uniformity of the preform, ensuring the surface accuracy and moldability of the preform, thereby greatly improving the quality and performance of the rotary three-dimensional preform and enhancing product quality consistency.

Description

Technical Field

[0001] This invention relates to the field of preform forming technology, and in particular to a method for controlling the yarn path of a rotating preform. Background Technology

[0002] In aerospace, rail transportation, and other fields, there is an increasing demand for high-performance composite material rotating components (such as cylindrical shells and shaped tubing) with complex stress structures. In the field of rotating preform molding, processes such as 2.5D braiding and needle punching are typically relied upon. Precise control of the yarn path is a core factor determining the performance of three-dimensional preforms, directly affecting the density uniformity, mechanical strength consistency, and molding quality stability of the preform.

[0003] In related technologies, yarn path control during the preform weaving process usually relies on manual experience. This control has low precision, and manual operation is easily affected by subjective factors, which can lead to problems such as yarn deviation and tension fluctuation, and in turn cause defects and uneven performance of the preform.

[0004] Therefore, there is an urgent need to provide a method for controlling the yarn path of a rotary preform and a preform to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention provides a method for controlling the yarn path of a rotary preform and the preform itself, which can improve the accuracy of yarn path control.

[0006] In a first aspect, embodiments of the present invention provide a method for controlling the yarn path of a rotary preform, comprising: Obtain the self-weight of the warp yarn to be wound, the breaking strength of the weft yarn to be wound, and the profile angle of the rotating core mold; The first tension of the warp yarn to be wound is determined based on its own weight; The second tension of the weft yarn to be wound is determined based on the breaking strength of the weft yarn to be wound. For each weft yarn, based on the current weft yarn density, preform thickness, number of preform layers, and profile angle corresponding to the current weft, the relative displacement of each layer of weft yarn in the current weft is determined; wherein, each weft yarn includes multiple layers of weft yarn, and in the weft yarn of the same weft, the height of the outer layer of weft yarn is greater than the height of the inner layer of weft yarn, and the relative displacement of the height of two adjacent layers of weft yarn is the same. The yarn path of the rotating preform is controlled based on the first tension, the second tension, the relative displacement, and the force direction of the warp and weft yarns to be wound.

[0007] Secondly, embodiments of the present invention provide a yarn path control device for a rotary preform, based on the method mentioned in the above embodiments, including: The acquisition module is used to acquire the self-weight of the warp yarn to be wound, the breaking strength of the weft yarn to be wound, and the surface angle of the rotating core mold. The first determining module is used to determine the first tension of the warp yarn to be wound based on the weight of the warp yarn to be wound. The second determining module is used to determine the second tension of the weft yarn to be wound based on the breaking strength of the weft yarn to be wound. The third determining module is used to determine the relative displacement of each layer of weft yarn in the current weft based on the weft yarn density, preform thickness, number of preform layers and profile angle corresponding to the current weft for each weft yarn; wherein, each weft yarn includes multiple layers of weft yarn, and in the weft yarn of the same weft, the height of the outer layer of weft yarn is greater than the height of the inner layer of weft yarn, and the relative displacement of the height of two adjacent layers of weft yarn is the same. The control module is used to control the yarn path of the rotating preform based on the first tension, the second tension, the relative displacement, and the force direction of the warp and weft yarns to be wound.

[0008] Thirdly, embodiments of the present invention provide a preform formed by winding using the method mentioned in the above embodiments.

[0009] Beneficial effects: This invention provides a method for controlling the yarn path of a rotary preform and the preform itself. The method controls the path of the warp and weft yarns by controlling the weave shape of the preform. The weave shape is determined by the first tension and force direction of the warp yarn to be wound, the second tension and force direction of the weft yarn to be wound, and the relative displacement of the heights of two adjacent weft yarn layers. Therefore, by controlling the above process parameters, the accuracy of yarn path control can be improved. This can effectively control the interlayer density uniformity of the preform, ensure the surface accuracy and moldability of the preform, and thus greatly improve the quality and performance of the rotary three-dimensional preform, and enhance product quality consistency. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a flowchart of the yarn path control method for a rotary preform provided in an embodiment of the present invention; Figure 2 This is a hardware architecture diagram of the electronic device provided in an embodiment of the present invention; Figure 3 This is a structural diagram of the yarn path control device for the rotary preform provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the automated winding equipment provided in an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the weaving angle and weaving edge height during the weaving process, provided by an embodiment of the present invention; Figure 6 This is a schematic diagram illustrating the relative displacement between weft yarn layers provided in an embodiment of the present invention; Figure 7 This is a schematic diagram illustrating different prefabricated cross-sectional morphologies provided in the embodiments of the present invention. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0013] like Figure 1 and Figure 4 As shown, this embodiment of the invention provides a method for controlling the yarn path of a rotary preform, including: Step 100: Obtain the self-weight of the warp yarn to be wound, the breaking strength of the weft yarn to be wound, and the profile angle of the rotating core mold; Step 102: Determine the first tension of the warp yarn to be wound based on its own weight; Step 104: Determine the second tension of the weft yarn to be wound based on the breaking strength of the weft yarn to be wound; Step 106: For each weft yarn, based on the weft yarn density, preform thickness, number of preform layers, and profile angle corresponding to the current weft, determine the relative displacement of the rise of each layer of weft yarn in the current weft; wherein, each weft yarn includes multiple layers of weft yarn, and in the weft yarn of the same weft, the height of the outer layer of weft yarn is greater than the height of the inner layer of weft yarn, and the relative displacement of the height of two adjacent layers of weft yarn is the same. Step 108: Based on the first tension, the second tension, the relative displacement, and the force direction of the warp and weft yarns to be wound, the yarn path of the rotating preform is adjusted.

[0014] In this embodiment, the path of warp and weft yarns is controlled by controlling the weave shape of the preform. The weave shape is determined by the first tension and force direction of the warp yarn to be wound, the second tension and force direction of the weft yarn to be wound, and the relative displacement of the heights of two adjacent weft yarn layers. Therefore, by controlling the above process parameters, the accuracy of yarn path control can be improved. This can effectively control the interlayer density uniformity of the preform, ensure the surface accuracy and mold adhesion of the preform, and thus greatly improve the quality and performance of the rotary three-dimensional preform, and enhance the consistency of product quality.

[0015] Currently, only 2.5D structure flat preforms can be automatically formed. Existing solutions cannot meet the requirements for automated winding forming of rotary preforms, and there is no relevant equipment available for reference, either domestically or internationally. When forming the radome preform, weft yarns need to be stored and continuously introduced in the warp yarn opening channel, and the effective tension of the weft yarns must be greater than the total tension of the warp yarns in the interlacing zone. The warp yarns must also be evenly applied to the mold surface. However, due to the large number of warp yarns, weft yarn wear is significant, and tension control is difficult. There is an urgent need to develop automated manufacturing processes, key modules and control systems, and research and develop three-dimensional winding equipment.

[0016] In addition, the related technologies mentioned in the background technology also have the following problems: low production efficiency, requiring frequent manual intervention to adjust parameters during the production process, making continuous production impossible; poor adaptability, requiring tedious parameter adjustments for 2.5D preforms of different specifications (such as yarn material, weaving density, and preform thickness), resulting in long production changeover cycles; and poor data traceability, lacking real-time recording and analysis of key parameters during yarn path control, making it difficult to achieve closed-loop control of product quality.

[0017] The aforementioned method is applicable to preform-reinforced composite materials in aerospace, defense, high-end automotive manufacturing, and high-end equipment manufacturing. It can be applied to industrial production scenarios with stringent requirements for density uniformity, mechanical strength consistency, molding quality stability, and production efficiency of 2.5D preforms. In particular, it can meet the rapid adaptation and production needs of 2.5D preforms of different materials (such as pitch-based carbon fiber, quartz fiber, glass fiber, aramid, etc.) and different specifications (including weaving density, preform thickness, and complex shapes). It can be adapted to large-capacity weaving systems (up to hundreds of thousands of units), providing core technical support for the automated and high-precision manufacturing of high-performance 2.5D preforms.

[0018] Therefore, the above method has the following advantages: high production efficiency, the automated yarn path control method reduces manual intervention, improves the automation level of the winding process, significantly improves production efficiency, and reduces production costs; strong process adaptability, it can quickly adapt to the production needs of 2.5D preforms of different specifications and materials, and adapt different control strategies for yarns with different properties, reducing changeover costs; high flexibility, it can adjust the yarn path in real time according to different winding requirements and actual conditions, and has strong flexibility and adaptability, which can meet diverse production needs.

[0019] like Figure 4 As shown, automated winding equipment can automatically interweave warp yarns and wind weft yarns, satisfying the forming of various preform structures such as 2.5D, orthogonal triaxial, and fiber-wound (i.e., preforms can include 2.5D preforms and orthogonal triaxial preforms). It should be noted that winding is a technology that uses dry fibers to wind three-dimensional preforms in collaboration with textile technology, emphasizing winding weaving more than knitting. In other words, winding is a forming process that combines winding and weaving, simultaneously introducing continuous fibers or yarns into an interwoven yarn system and winding them along a mandrel or spatial path.

[0020] It should be noted that this invention emphasizes the yarn path control method, rather than the automated winding equipment. A key technical point of automated winding equipment is the height adjustment of the weft insertion system (or winding device). The specific implementation of the height-adjustable structure is not within the scope of this invention, nor is it a necessary technical feature. However, the key process indicator of this invention's yarn path control method is the ability to change the relative displacement of the height of different layers of weft yarns with the same weft through a height-adjustable weft insertion system. It is understood that the layered control (i.e., height adjustment) of the weft insertion system is achieved through a stepper motor or piezoelectric drive, with the adjustment of the position of each layer of weft yarn and tension control executed synchronously. Furthermore, the height change of different weft yarns is achieved by mounting the mandrel on the worktable of the automated winding machine; each time a weft is wound, the worktable is raised a certain distance. This is well known to those skilled in the art and will not be elaborated upon here.

[0021] In one embodiment of the present invention, the weight of the warp yarn to be wound is determined by the following formula: G = L × N / 1000 × T / 1000 × g In the formula, G is the self-weight in Newtons (N), L is the warp length between the tension system and the rotating mandrel in meters (m), N is the number of warp plies in strands, T is the warp linear density in Tex, and g is taken as 9.8 m / s. 2 .

[0022] In this embodiment, the warp tension is controlled by a warp tension system driven by a servo motor, with a response time of ≤50ms. It supports independent correction of the tension of a single warp yarn, which can effectively avoid uneven tension and prevent grooves from forming in the preform. The ideal range of warp tension value is that it can overcome the weight of the warp yarn and the weave layer is clear.

[0023] In one embodiment of the present invention, the first tension is greater than the weight of the warp yarn to be wound, and the second tension is 10% to 50% of the breaking strength.

[0024] In this embodiment, the weft tension and warp tension are controlled in a coordinated manner to ensure good mold adhesion of the preform. The weft tension is controlled by the weft insertion system, and its control range is based on the mechanical properties (breaking strength) of the weft yarn. First, a universal testing machine is used to test the mechanical properties of the weft yarn. The tension setting is based on the standard that the weft yarn "does not stretch significantly". The tension value is usually controlled at 10% to 50% of its breaking strength. It is necessary to combine real-time tension feedback and yarn length monitoring to avoid preform density deviation caused by excessive tension.

[0025] In one embodiment of the present invention, the warp yarn to be wound and the weft yarn to be wound are plyed using a balanced twisting process, with a twist of 20~80 twists / m.

[0026] In this embodiment, the mechanical properties of the yarn are affected by the number of plies, twist, and twist direction. A balanced twisting process is used during yarn plying; within a certain range, twist is positively correlated with mechanical properties. To ensure that the compounding process is not affected, the twist range is controlled between 20 and 80 twists / m.

[0027] In one embodiment of the present invention, it further includes: During the winding process, the surface accuracy of the preform is visually inspected, and the first and second tensions are controlled based on the surface accuracy to ensure that the deviation of the surface accuracy is within a preset range.

[0028] In this embodiment, during the automatic weaving process, the "visual detection module + tension sensing module" detects the surface accuracy and yarn tension fluctuations in real time and feeds the data back to the control system in real time. If a deviation occurs, the system automatically corrects the parameters to form a closed-loop control.

[0029] like Figure 5 As shown, in one embodiment of the present invention, the force direction of the warp yarn to be wound is determined by the weft height, and the force direction of the weft yarn to be wound is determined by the relative height between the weft yarn in the weft insertion system and the reference plane of the winding equipment.

[0030] In one embodiment of the present invention, the angle between the force direction of the warp yarn to be wound and the rotating core mold is 20~90°.

[0031] In this embodiment, the direction of force on the warp yarn is controlled by the weft inlet height. The angle formed between this direction and the mandrel is the winding angle, which ranges from 20° to 90°. The angle adjustment accuracy is ≤ ±1° to avoid differences in interlayer spacing (i.e., the relative displacement of each layer of weft yarn) caused by angle deviation, thereby improving the interlayer bonding force. The direction of force on the weft yarn is controlled by the relative height between the weft yarn in the weft insertion system and the reference plane of the winding equipment. This height is less than the weft inlet height and is usually set as the difference between the weft inlet height value and the length of each weft knot.

[0032] like Figure 6 As shown, in one embodiment of the present invention, the height of the weft insertion system is adjustable, and the relative displacement is determined by the following formula: h = sin(180 - arctan(H × J)) w / 10)-α) / n× In the formula, h is the relative displacement in mm, H is the thickness of the precast body in mm, and J is the weight of the precast body. w α represents the weft yarn density, in threads / cm, α is the profile angle corresponding to the current weft, and n is the number of prefabricated layers.

[0033] In this embodiment, during the preform forming process, the weft tension increases layer by layer from the inner layer to the outer layer, and the relative position of the weft yarns rises layer by layer. The weft insertion system has a layer-by-layer independent control function (i.e., height adjustable) to meet the forming requirement of the weft tension increasing layer by layer from the inner layer to the outer layer of the preform. Here, the specific structural implementation of the height adjustable weft insertion system will not be described in detail or limited.

[0034] In summary, the above method focuses on dynamic control of the weave shape, achieving yarn path control through coordinated tension control of warp and weft yarns, precise adjustment of force direction, and closed-loop feedback correction. The tension control benchmark is determined based on the warp yarn's self-weight, and the weft tension is set at 10%~50% of the weft yarn's breaking strength. The warp yarn's force direction is adjusted by the weave height to form a winding angle of 20°~90°, while the weft yarn's force direction is controlled by its relative height to the reference plane of the winding equipment. Furthermore, the relative position of the weft yarn increases layer by layer from the inner layer to the outer layer, with the increase displacement calculated using parameters such as preform thickness and weft density. During automatic winding, the surface accuracy and yarn tension fluctuations are detected in real time by a visual inspection module and a tension sensing module, with parameters adjusted in a closed loop at a correction cycle of ≤50ms. This invention offers high control precision, high production efficiency, strong process adaptability, and traceability of key parameters. It can meet the high-precision automated production needs of aerospace and other fields for irregularly shaped 2.5D preforms of different materials and specifications, ensuring the uniformity of preform density, consistency of mechanical strength, and stability of molding quality.

[0035] The above method is described below with reference to two specific embodiments.

[0036] Example 1 The 2.5D conical rotating preform has a maximum diameter of 400mm and a thickness of 25mm. The preform has a warp density of 7 threads / cm, a weft density of 2.2 threads / cm, and 29 layers. The raw material is quartz fiber with a specification of 190Tex. It has 4 warp strands and 8 weft strands, with a balanced twist pattern (S first, then Z), a twist of 40 twists / m, and a breaking strength of 612N.

[0037] Core parameter settings: Warp tension: Warp weight G = 7m × 4 / 1000 × 190 / 1000 × 9.8 = 0.052N, set to 0.1N; Weft tension: Based on the mechanical properties of 8 strands of quartz fiber, the weft tension is set to 22% of its breaking strength, which is 135N; The relative height between the weft yarn and the reference plane of the winding equipment is set to 1750mm, the winding angle is 50°, and the relative height between the weft yarn and the reference plane of the winding equipment is set to 1745.5mm. The relative displacement value for the rise of each weft yarn layer is set to 0.44 mm, and the specific calculation is as follows: h=sin(180°-Arctan(25×2.2 / 10)°-70°) / 29× ≈0.44mm.

[0038] Implementation results: Product surface accuracy deviation ≤2%, volume content fluctuation within 2%, product surface smooth, without grooves or defects, and production efficiency increased by 30% compared to traditional methods.

[0039] Example 2 The 2.5D variable cross-section rotating precast body has a maximum diameter of 655mm and a thickness that gradually decreases to a maximum of 15mm. The cross-sectional shape of the precast body is as follows: Figure 4 As shown. The preform has a warp density of 4 threads / cm, a weft density of 3 threads / cm, and 24 layers. The raw material is aramid fiber with a specification of 167Tex. The warp yarns are 2 strands, and the weft yarns are 2-4 strands. The weft yarn twisting method is balanced twist, first Z then S, with a twist of 30 twists / m and a breaking strength range of 312-605N.

[0040] Core parameter settings: Warp tension: Warp weight G = 10m × 2 / 1000 × 190 / 1000 × 9.8 = 0.052N, set to 0.1N; Weft tension: When the weft yarn is 2 strands, the weft tension is set to 40% of its breaking strength, which is 125N; when the weft yarn is 4 strands, the weft tension is set to 35% of its breaking strength, which is 210N.

[0041] When forming region 1, the weft opening height is set to 1650mm, the winding angle is 40°, and the relative height between the weft yarn and the reference plane of the winding equipment is set to 1646.5mm; when forming region 2, the weft opening height is set to 1600mm, the winding angle is 80°, and the relative height between the weft yarn and the reference plane of the winding equipment is set to 1596.5mm. The relative displacement of 5 weft yarns at different heights was calculated. The relative displacement value of each layer of weft yarns was set to vary according to different process parameters. The corresponding values ​​for each weft are as follows: h1=sin(180°-Arctan(6.2×3 / 10)°-90°) / 10× ≈0.33mm h2=sin(180°-Arctan(8.4×3 / 10)°-90°) / 14× ≈0.24mm h3=sin(180°-Arctan(10.6×3 / 10)°-90°) / 17× ≈0.20mm h4=sin(180°-Arctan(12.8×3 / 10)°-90°) / 20× ≈0.17mm h5=sin(180°-Arctan(15×3 / 10)°-90°) / 24× ≈0.14mm.

[0042] The winding equipment operates automatically according to the set parameters. After completing the winding of zone 1, it automatically switches to the parameters of zone 2 to continue the operation.

[0043] Implementation results: The area transformation can be completed quickly according to the design parameters without manual intervention. The surface accuracy deviation is ≤ ±0.5mm, the contouring accuracy is high, the production cost is reduced by 50%, and the key parameters are traceable throughout the process.

[0044] like Figure 2 , Figure 3 As shown, this embodiment of the invention provides a yarn path control device for a rotating preform. The device embodiment can be implemented through software, hardware, or a combination of both. From a hardware perspective, as... Figure 2 The diagram shown is a hardware architecture diagram of an electronic device for controlling the yarn path of a rotating preform according to an embodiment of the present invention. (Except for...) Figure 2 In addition to the processor, memory, network interface, and non-volatile memory shown, the electronic device in the embodiment may also include other hardware, such as a forwarding chip responsible for processing packets. Taking software implementation as an example, such as... Figure 3As shown, a device in a logical sense is formed by the CPU of the electronic device in which it is located reading the corresponding computer program from the non-volatile memory into the memory for execution.

[0045] This embodiment provides a yarn path control device for a rotary preform, comprising: The acquisition module 300 is used to acquire the self-weight of the warp yarn to be wound, the breaking strength of the weft yarn to be wound, and the surface angle of the rotating core mold. The first determining module 302 is used to determine the first tension of the warp yarn to be wound based on the weight of the warp yarn to be wound. The second determining module 304 is used to determine the second tension of the weft yarn to be wound based on the breaking strength of the weft yarn to be wound. The third determining module 306 is used to determine the relative displacement of each layer of weft yarn in the current weft based on the weft yarn density, preform thickness, number of preform layers and profile angle corresponding to the current weft for each weft yarn; wherein, each weft yarn includes multiple layers of weft yarn, and in the weft yarn of the same weft, the height of the outer layer of weft yarn is greater than the height of the inner layer of weft yarn, and the relative displacement of the height of two adjacent layers of weft yarn is the same. The control module 308 is used to control the yarn path of the rotating preform based on the first tension, the second tension, the relative displacement, and the force direction of the warp and weft yarns to be wound.

[0046] In this embodiment of the invention, the acquisition module 300 can be used to execute step 100 in the above method embodiment, the first determination module 302 can be used to execute step 102 in the above method embodiment, the second determination module 304 can be used to execute step 104 in the above method embodiment, the third determination module 306 can be used to execute step 106 in the above method embodiment, and the control module 308 can be used to execute step 108 in the above method embodiment.

[0047] In one embodiment of the present invention, the weight of the warp yarn to be wound is determined by the following formula: G = L × N / 1000 × T / 1000 × g In the formula, G is the self-weight in Newtons (N), L is the warp length between the tension system and the rotating mandrel in meters (m), N is the number of warp plies in strands, T is the warp linear density in Tex, and g is taken as 9.8 m / s. 2 .

[0048] In one embodiment of the present invention, the first tension is greater than the weight of the warp yarn to be wound, and the second tension is 10% to 50% of the breaking strength.

[0049] In one embodiment of the present invention, the warp yarn to be wound and the weft yarn to be wound are plyed using a balanced twisting process, with a twist of 20~80 twists / m.

[0050] In one embodiment of the present invention, it further includes: The detection and control module is used to visually inspect the surface accuracy of the preform during the weaving process, and control the first tension and the second tension based on the surface accuracy so that the deviation of the surface accuracy is within a preset range.

[0051] In one embodiment of the present invention, the direction of force on the warp yarn to be wound is determined by the weft height, and the direction of force on the weft yarn to be wound is determined by the relative height between the weft yarn in the weft insertion system and the reference plane of the winding equipment.

[0052] In one embodiment of the present invention, the angle between the force direction of the warp yarn to be wound and the rotating core mold is 20~90°.

[0053] In one embodiment of the present invention, the height of the weft insertion system is adjustable, and the relative displacement is determined by the following formula: h = sin(180 - arctan(H × J)) w / 10)-α) / n× In the formula, h is the relative displacement in mm, H is the thickness of the precast body in mm, and J is the weight of the precast body. w α represents the weft yarn density, in threads / cm, α is the profile angle corresponding to the current weft, and n is the number of prefabricated layers.

[0054] It is understood that the structures illustrated in the embodiments of the present invention do not constitute a specific limitation on a yarn path control device for a rotary preform. In other embodiments of the present invention, a yarn path control device for a rotary preform may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0055] The information interaction and execution process between the modules in the above-mentioned device are based on the same concept as the method embodiment of the present invention, and the specific details can be found in the description of the method embodiment of the present invention, and will not be repeated here.

[0056] This invention also provides an electronic device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements a yarn path control method for a rotating preform according to any embodiment of this invention.

[0057] This invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, causes the processor to perform a yarn path control method for a rotating preform according to any embodiment of this invention.

[0058] Specifically, a system or apparatus equipped with a storage medium may be provided, on which software program code implementing the functions of any of the embodiments described above is stored, and the computer (or CPU or MPU) of the system or apparatus may read and execute the program code stored in the storage medium.

[0059] In this case, the program code read from the storage medium can itself implement the function of any of the above embodiments, and therefore the program code and the storage medium storing the program code constitute part of the present invention.

[0060] Storage media embodiments for providing program code include floppy disks, hard disks, magneto-optical disks, optical disks (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), magnetic tapes, non-volatile memory cards, and ROMs. Alternatively, program code can be downloaded from a server computer via a communication network.

[0061] Furthermore, it should be clear that not only can the program code read by the computer be executed, but also the operating system or other components operating on the computer can be instructed based on the program code to perform some or all of the actual operations, thereby realizing the function of any of the embodiments described above.

[0062] Furthermore, it is understood that the program code read from the storage medium is written to the memory set in the expansion board inserted into the computer or to the memory set in the expansion module connected to the computer. Then, based on the instructions of the program code, the CPU or other components installed on the expansion board or expansion module execute some and all of the actual operations, thereby realizing the function of any of the above embodiments.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or electronic device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or electronic device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or electronic device that includes said element.

[0064] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various storage media that can store program code, such as ROM, RAM, magnetic disk, or optical disk.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method of yarn path regulation for a preform of a rotary body, characterized by, include: Obtain the self-weight of the warp yarn to be wound, the breaking strength of the weft yarn to be wound, and the profile angle of the rotating core mold; The first tension of the warp yarn to be wound is determined based on its own weight; The second tension of the weft yarn to be wound is determined based on the breaking strength of the weft yarn to be wound. For each weft yarn, based on the current weft yarn density, preform thickness, number of preform layers, and profile angle corresponding to the current weft, the relative displacement of each layer of weft yarn in the current weft is determined; wherein, each weft yarn includes multiple layers of weft yarn, and in the weft yarn of the same weft, the height of the outer layer of weft yarn is greater than the height of the inner layer of weft yarn, and the relative displacement of the height of two adjacent layers of weft yarn is the same. The yarn path of the rotating preform is controlled based on the first tension, the second tension, the relative displacement, and the force direction of the warp and weft yarns to be wound.

2. The method of claim 1, wherein, The weight of the warp yarn to be wound is determined by the following formula: G = L × N / 1000 × T / 1000 × g where G is the weight, in N, L is the length of warp yarn between the tension system and the core of the rotating body, in m, N is the number of warp yarns, in ends, T is the warp yarn density, in Tex, and g is 9.8, in m / s 2 .

3. The method of claim 1, wherein, The first tension is greater than the weight of the warp yarn to be wound, and the second tension is 10% to 50% of the breaking strength.

4. The method of claim 1, wherein, The warp and weft yarns to be wound are plyed using a balanced twisting process, with a twist of 20~80 twists / m.

5. The method according to claim 1, characterized in that, Also includes: During the winding process, the surface accuracy of the preform is visually inspected, and the first and second tensions are controlled based on the surface accuracy to ensure that the deviation of the surface accuracy is within a preset range.

6. The method according to any one of claims 1-5, characterized in that, The direction of force on the warp yarn to be wound is determined by the weft height, while the direction of force on the weft yarn to be wound is determined by the relative height between the weft yarn in the weft insertion system and the reference plane of the winding equipment.

7. The method according to claim 6, characterized in that, The angle between the direction of force on the warp yarn to be wound and the rotating core mold is 20~90°.

8. The method according to claim 6, characterized in that, The height of the weft insertion system is adjustable, and the relative displacement is determined by the following formula: h=sin(180-arctane(H×J w / 10)-α) / n× where h is the relative displacement in mm, H is the preform thickness in mm, J w is the weft density in ends / cm, a is the profile angle corresponding to the current weft, and n is the preform layer number.

9. A yarn path control device for a rotary preform, characterized in that, Based on the method of any one of claims 1-8, comprising: The acquisition module is used to acquire the self-weight of the warp yarn to be wound, the breaking strength of the weft yarn to be wound, and the surface angle of the rotating core mold. The first determining module is used to determine the first tension of the warp yarn to be wound based on the weight of the warp yarn to be wound. The second determining module is used to determine the second tension of the weft yarn to be wound based on the breaking strength of the weft yarn to be wound. The third determining module is used to determine the relative displacement of each layer of weft yarn in the current weft based on the weft yarn density, preform thickness, number of preform layers and profile angle corresponding to the current weft for each weft yarn; wherein, each weft yarn includes multiple layers of weft yarn, and in the weft yarn of the same weft, the height of the outer layer of weft yarn is greater than the height of the inner layer of weft yarn, and the relative displacement of the height of two adjacent layers of weft yarn is the same. The control module is used to control the yarn path of the rotating preform based on the first tension, the second tension, the relative displacement, and the force direction of the warp and weft yarns to be wound.

10. A precast body, characterized in that, The method described in any one of claims 1-8 is used for winding and forming.

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