Overall weaving method of panel with longitudinal and transverse ribs

Abstract

The invention discloses an integral weaving method of a panel with longitudinal and transverse ribs and a part manufacturing technology of the panel. According to the weaving method, on the three-dimensional woven panel, the longitudinal ribs are integrally woven with the panel in a yarn changing mode, and the transverse ribs are integrally woven with the panel and the longitudinal ribs in a yarn threading mode. The prefabricated part obtained through the method is high in structural integrity, the performance of the prefabricated part is effectively improved, the method is simple, the applicability is wide, production procedures are effectively reduced, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to a weaving technology for panel-type components containing longitudinal and transverse ribs. Specifically, in the weaving forming direction of the three-dimensional woven panel, the longitudinal ribs are woven integrally with the panel by a yarn replacement method, and the transverse ribs are connected to the panel and the longitudinal ribs by a yarn threading method. The yarn continuity of the three parts is ensured, thereby improving the integrity of the product. Background Art

[0002] Three-dimensional textile reinforcement materials (three-dimensional textile preforms) are made using new three-dimensional textile process technology. Continuous fiber bundles are interwoven in three-dimensional space according to certain rules to form an integral fiber network structure that runs through all directions of space. It is a structural reinforcement skeleton for high-performance composite materials, with the characteristics of continuous fibers, integral structure, superior performance, and strong designability. It fundamentally overcomes the problem of easy delamination of traditional composite materials due to the lack of yarns passing between layers. It has been widely used in aerospace and other fields. This patent mainly involves the integrated coupling weaving of two structures: three-dimensional weaving and three-dimensional weaving.

[0003] The basic three-dimensional weaving structure has only one weaving yarn system. The weaving yarns move simultaneously along the four main diagonal directions of the rectangle, running through the length, width and thickness directions of the fabric to form an interwoven three-dimensional four-way weaving structure. According to needs, straight axial yarns that do not participate in weaving can be added along the length, width and thickness directions of the fabric to form three-dimensional five-way, three-dimensional six-way and three-dimensional seven-way weaving structures. The three-dimensional textile technology can be used to weave integral preforms of complex shapes and different sizes at the net size.

[0004] The basic three-dimensional weaving technology is a weaving technology that uses a multi-layer warp weaving method to connect several warp and weft yarn layers to form a three-dimensional integral preform with a certain thickness. Since the warp yarn does not penetrate the entire thickness of the fabric, this fabric structure is also called a 2.5D woven structure. On the basis of the 2.5D woven structure, the introduction of warp yarns, weft yarns and normal yarns along the warp, weft and normal directions (fabric thickness direction) or the simultaneous introduction of warp yarns, weft yarns and normal yarns can form a variety of derivative structures. Due to its good design, simple process, high degree of automation, ability to produce large-size preforms, and relatively low price, it has been widely used in defense fields such as aviation, aerospace, and ships, as well as in construction, automobile industry, and civil sports goods.

[0005] In actual engineering applications, there is a type of composite wall panel products with cross-shaped ribs crisscrossed on the panel, such as lens barrels, skins and other fabrics. At present, one of the commonly used manufacturing processes is to use the laying technology, cut out multiple single-layer cloths according to a predetermined shape, and then stack the single-layer cloths together according to a certain rule, and assemble them into a whole through sewing, bonding or lamination. The reinforced composite wall panels made by this method of the patent "composite wall panels" (CN109551830A) have low interlayer strength and easy stratification, and the use scenarios are limited; one is to first produce a large-sized three-dimensional prefabricated blank, and then obtain the target prefabricated part through mechanical processing (such as cutting and shaving), which will damage the fabric fibers, produce a large number of discontinuous short fibers, destroy the overall structure of the three-dimensional woven fabric, reduce the overall performance of the composite material and the stability of the product performance, and the yarn utilization rate is not high, resulting in a large amount of raw material waste; the other is to adopt the molding process method of adhesive co-curing, first cure the panel, and then glue the uncured transverse and longitudinal ribs to the panel for co-curing molding. The composite products produced by this manufacturing method are greatly affected by the environment (humidity, heat, corrosive media), have certain aging problems, and the adhesive strength is highly dispersed, the peel strength is low, and it cannot transmit large loads. The patent "Method for Weaving Cross-Shaped Three-Dimensional Five-Directional Reinforcements" (CN102677389B) mentions a method for weaving cross ribs, but does not mention the overall weaving technology for connecting the cross ribs to the panel. At the same time, it only limits the three-dimensional weaving structure to three-dimensional five-directional, and has a small scope of application. The patent "A three-dimensional weaving reinforced tube process and reinforced tube" (CN 111926454 B) mentions a process for an overall three-dimensional weaving reinforced tube, but only involves the overall weaving of the longitudinal tube, does not contain transverse ribs, and the overall process is a three-dimensional weaving process, and does not involve the overall weaving method of the three-dimensional woven panel and the three-dimensional weaving ribs. Summary of the invention

[0006] 0006. Aiming at the technical deficiencies of the existing integral weaving method of panel-type components with longitudinal and transverse ribs, the purpose of the present invention is to propose an integrated weaving technology that uses pre-embedding and replacement. The longitudinal ribs in the molding direction are woven together with the panel by yarn replacement, and the transverse ribs are connected with the panel and the longitudinal ribs by yarn threading. The three parts all ensure the continuity of yarns and improve the integrity. This weaving method is not limited by size, so that the prefabricated parts can be woven in an integrated net size. The yarns in each part are interwoven and continuous, the transverse and longitudinal ribs are accurately positioned, the method is simple, and the applicability is wide.

[0007] The technical solution proposed in the present invention is: using the three-dimensional woven panel and three-dimensional braided rib integral weaving technology, which is characterized in that the transverse reinforcement is first woven separately, and in the weaving process of the transverse reinforcement, a design position that interpenetrates with the longitudinal reinforcement is reserved and a lead wire with a coil connected to the panel is pre-embedded. The transverse reinforcement is woven according to the length of the drawing and is reserved for use; then the longitudinal reinforcement and the panel are woven as a whole by changing the yarn. When weaving to the position where the transverse reinforcement is added, first fix the connection position between the panel and the transverse reinforcement, and insert the surface warp yarn of the panel one by one into the lead wire with a coil pre-embedded in the transverse reinforcement on the side in contact with the panel, and then pull the lead wire with the coil out from the transverse reinforcement in turn, so as to realize the interweaving of the panel's braided yarn and the transverse reinforcement; after that, the yarn of the longitudinal reinforcement that does not participate in the weaving is passed through the reserved design position of the transverse reinforcement in a cross manner, so as to realize the overall penetration connection of the longitudinal and transverse reinforcements. For the convenience of the subsequent description, the lead wire with a coil pre-embedded and connected to the panel is used as a collection a n Indicates; the design position reserved for the longitudinal and transverse reinforcements to penetrate each other is represented by the set b n , n is a natural number. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A schematic diagram of the appearance of an embodiment of a product woven by the weaving method of the present invention; Figure 2 This is a physical diagram of the appearance of an embodiment of a product woven by the weaving method of the present invention; Figure 3 This is a schematic diagram of pre-embedded leads and blank spaces for longitudinal reinforcement when weaving semi-finished transverse reinforcement; Figure 4 It is a schematic diagram of the connection between the transverse reinforcement and the longitudinal reinforcement; Figure 5 It is the connection diagram of the transverse reinforcement and the panel; Figure 6 This is the warp yarn arrangement diagram of the 2.5D woven panel of Example; Figure 7 It is a diagram showing the arrangement of the braided yarns of the three-dimensional four-directional ribs of the embodiment; Figure 8 Schematic diagram of the 2.5D woven structure in this embodiment; Fig. 9 Corresponding diagram of the position of the 2.5D woven panel and the longitudinal reinforcement yarn in this embodiment. DETAILED DESCRIPTION

[0009] 0008. The present invention is an overall weaving method for panel-type components with longitudinal and transverse ribs. In actual operation, it includes the following steps.

[0010] The transverse reinforcement is woven based on the four-step weaving principle. The structure of the transverse reinforcement includes three-dimensional four-way, three-dimensional five-way, three-dimensional six-way and three-dimensional seven-way structures. During the weaving process, a lead wire with a coil is pre-embedded in the first layer of weaving yarn on the side where the transverse reinforcement contacts the panel by weft insertion for each half of the weaving. For the convenience of subsequent description, each pre-embedded lead wire with a coil is numbered as a1, a2, a3. . . . . . a n (n is twice the number of transverse reinforcement nodes); when weaving to the designed position where the longitudinal and transverse reinforcements intersect each other, it is necessary to leave a blank space without weaving. The length of the blank space is the width of the longitudinal reinforcement. For the convenience of subsequent description, this blank space is numbered as b1 and b2. . . . . . B n (n is consistent with the number of longitudinal reinforcement), such as Figure 3 As shown, after the semi-finished product of the transverse reinforcement is woven, it is placed aside for use.

[0011] 0009.2.5D woven panel and three-dimensional woven longitudinal reinforcement are synchronously woven by changing yarns and formed into one piece. The panel structure includes 2.5D fabric and its derivative structure, and the longitudinal reinforcement structure includes three-dimensional four-way, three-dimensional five-way, three-dimensional six-way, and three-dimensional seven-way structures. The woven panel weaving equipment and the longitudinal reinforcement weaving equipment are arranged vertically and weaved synchronously. For each half or one knot of the longitudinal reinforcement, the first layer of weaving yarn c1, c2, c3 on the side where the longitudinal reinforcement contacts the panel needs to be woven. . . . . . c n (n is consistent with the number of yarns in the first layer of longitudinal reinforcement) and the number of warp yarns d in the corresponding position of the panel n A one-to-one replacement is performed, and the number of replaced yarns is determined by the number of braided yarns in the first layer of the longitudinal reinforcement.

[0012] When weaving to the position where the transverse reinforcement is added, the side of the semi-finished transverse reinforcement containing the embedded lead is fitted to the panel, and the yarn of the longitudinal reinforcement that is not involved in the weaving is passed through the reserved design position of the transverse reinforcement in a cross-shaped manner. n In order to achieve the overall penetration connection of the longitudinal and transverse reinforcement, such as Figure 4 As shown, 4-1 is the longitudinal reinforcement, 4-2 is the transverse reinforcement, and 4-3 is the longitudinal reinforcement that does not participate in the weaving yarn.

[0013] The surface warp yarns of the panel are numbered as d1, d2, d3. n (Warp d n The number of roots and a n Same), one by one into the transverse reinforcement embedded coil a n Then put the lead wire a with coil n Together with the surface warp yarn of the worn panel d n Pull out from the transverse ribs one by one to achieve the interweaving of the panel and the transverse ribs, such as Figure 5 As shown, 5-1 is the surface warp yarn d n , 5-2 is lead wire a with coil n .

[0014] 0010. The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should also be understood that after reading the contents described in the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms are also used in the scope defined by the claims attached to this application.

[0015] Embodiment 1: 0012. As Figure 1 It is a panel prefabricated part with longitudinal and transverse ribs woven using this patented technology. The raw material is T800-12K carbon fiber. Figure 1 The "1" part is a 2.5D structural woven panel with a size of 100×100×5mm, a warp density of 8 strands / cm, a weft density of 4 strands / cm, and a yarn arrangement of 80 rows × 8 layers. For the convenience of subsequent description, each warp yarn position is given a coordinate [L,H] B , L represents the column number, H represents the row number, such as Figure 6 The coordinate numbers of the two marked warp yarns are [2,5] B ,[77,2] B . Figure 1 The "2" part is a three-dimensional woven three-dimensional four-way transverse reinforcement, and the "3" part is a three-dimensional woven three-dimensional four-way longitudinal reinforcement. The dimensions of the transverse and longitudinal reinforcement strips are 100×10×3mm, the length of the flower node is 5mm / piece, and the yarn is arranged in 8 columns × 6 layers. For the convenience of subsequent description, each woven yarn position is given a coordinate [l,h] J , l represents the column number, h represents the row number, such as Figure 6 In the figure, the coordinates of the two marked braided yarns are [3,2] J ,[7,6] J .

[0016] Step 1: Weave three-dimensional four-way transverse reinforcement based on the four-step method. The transverse reinforcement yarns are arranged in 8 rows × 6 layers. The schematic diagram of the arrangement of the braided yarns on the three-dimensional braiding machine is shown in Figure 7 Each time half of the flower knot is woven, a lead wire with a coil is pre-buried in the first layer by weft insertion. First, 9 flower knots are woven. When the fabric length is 45 mm, a total of 18 lead wires with coils are pre-buried (recorded as a1~a 18 ), stop weaving. Then, leave 10mm of the unwoven warp yarn unwoven and do not participate in weaving. This space is marked as b1. Finally, continue weaving 9 flower knots in this way, pre-bury 18 leads with coils (marked as a 19 ~a 36 ), weaving is stopped when the total length of the fabric reaches 100mm, and a total of 36 leads are pre-buried.

[0017] Step 2: Figure 1Part "1" is a panel woven based on the 2.5D woven fabric weaving method. See the structural diagram for details. Figure 8 ; Figure 1 The "3" part is a three-dimensional four-way longitudinal reinforcement based on the four-step principle, and the "1" and "2" parts are woven as one. The corresponding relationship of the yarn positions is shown in Fig. 9 When the longitudinal reinforcement weaves half a knot, the panel weaves one weft at the same time. After weaving, the yarns in the corresponding positions of the panel and the longitudinal reinforcement are replaced one by one. Fig. 9 , the first time [37,1] B and [1,6] J , [39,1] B and [3,6] J , [41,1] B and [5,6] J , [43,1] B and [7,6] J The yarn at the position is replaced, the second time [38,1] B and [2,6] J , [40,1] B and [4,6] J , [42,1] B and [6,6] J , [44,1] B and [8,6] J The yarn at the position is replaced, and the yarn is replaced alternately in this order in the future. The panel is woven with 18 wefts, and the longitudinal reinforcement is woven with 9 flower knots, alternating 18 times in total. When the fabric length is 45mm, the preliminary transverse reinforcement is added.

[0018] Step 3: Overlap the blank position b1 in the transverse reinforcement with the position of the longitudinal reinforcement, and pass the yarn of the longitudinal reinforcement that is not involved in the weaving through the reserved design position b1 of the transverse reinforcement in a cross manner, fix the position of the transverse and longitudinal reinforcements, so as to achieve the overall penetration connection of the longitudinal and transverse reinforcements.

[0019] Step 4: Insert the surface warp yarn of the panel one by one into the pre-buried coils a1~a in the transverse ribs 36 Among them, [1,1] J Enter a1, [3,1] J Penetrate a2, [7,1] J Penetrate a3, [9,1] J Penetrate a4, [11,1] J Penetrate a5, [13,1] J Penetrate a6, [15,1] J Penetrate a7, [17,1] J Penetrate a8, [19,1] J Penetrate a9, [21,1] J Penetrate a 10, [25,1] J Penetrate a 11 , [27,1] J Penetrate a 12 , [29,1] J Penetrate a 13 , [31,1] J Penetrate a 14 , [33,1] J Penetrate a 15 , [35,1] J Penetrate a 16 , [37,1] J Penetrate a 17 , [39,1] J Penetrate a 18 , [43,1] J Penetrate a 19 , [45,1] J Penetrate a 20 , [47,1] J Penetrate a 21 , [51,1] J Penetrate a 22 , [53,1] J Penetrate a 23 , [55,1] J Penetrate a 24 , [57,1] J Penetrate a 25 , [59,1] J Penetrate a 26 , [61,1] J Penetrate a 27 , [63,1] J Penetrate a 28 , [65,1] J Penetrate a 29 , [67,1] J Penetrate a 30 , [69,1] J Penetrate a 31 , [71,1] J Penetrate a 32 , [73,1] J Penetrate a 33 , [75,1] J Penetrate a 34 , [77,1] J Penetrate a 35 , [79,1] J Penetrate a 36 , so as to realize the connection between the horizontal reinforcement and the panel

[0020] Step 5: Continue to weave the longitudinal reinforcement and the panel. For every half of the flower knot weaved by the longitudinal reinforcement, the panel will be woven with one weft at the same time. The yarns in the corresponding positions of the panel and the longitudinal reinforcement are replaced one by one, such as Fig. 9 , the first time [37,1] B and [1,6] J , [39,1] B and [3,6] J , [41,1] B and [5,6] J , [43,1] B and [7,6] J The yarn at the position is replaced, the second time [38,1] B and [2,6] J , [40,1] B and [4,6] J , [42,1] B and [6,6] J , [44,1] B and [8,6] J The yarns at the positions are replaced, and they are alternated in this order. The panel is woven with 22 wefts, and the longitudinal reinforcement is woven with 11 knots, alternating 22 times in total. When the fabric length reaches 100mm, the weaving is finished.

[0021] At this point, the weaving of the longitudinal and transverse rib panel fabric has been completed.

Claims

1. An integral weaving method of a panel with longitudinal and transverse ribs, the weaving method is based on three-dimensional weaving and three-dimensional weaving technology, and is characterized in that During the weaving process of the transverse reinforcement, the integrated weaving technology of pre-embedding and replacement is adopted to weave the strip-shaped transverse reinforcement structure separately, reserving the position for the transverse and longitudinal reinforcements to penetrate each other, and then the yarn of the longitudinal reinforcement that is not involved in the weaving is passed through the reserved position of the transverse reinforcement in a cross manner, thereby realizing the overall penetration connection of the longitudinal and transverse reinforcements.

2. The transverse reinforcement braided structure according to claim 1 is characterized in that The structure adopts a three-dimensional four-directional, three-dimensional five-directional, three-dimensional six-directional or three-dimensional seven-directional weaving structure.

3. The woven structure of the panel and longitudinal reinforcement according to claim 1 is characterized in that The structure adopts an orthogonal three-way structure, a layer-by-layer angle interlocking structure and its various derivative structures.

4. The panel weaving process according to claim 1, characterized in that The longitudinal reinforcement is woven integrally with the panel by means of yarn replacement.

5. A process for preforming a composite material panel with longitudinal and transverse ribs, which is characterized in that it is integrally woven by the three-dimensional weaving method described in claim 1.

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