In-situ net-shaping weaving method for three-dimensional curved surface woven fabric

Abstract

The present application relates to a kind of three-dimensional curved fabric in-situ net forming shaping weaving method, three-dimensional curved fabric model includes m curved fabric area, the j curved fabric area is sequentially arranged by n j Sub-area along warp, the i sub-area is made of warp and the r to r+N i -1 weft yarn;When weaving the i sub-area, a pair of convex member and concave member are used, and the specific process is as follows: first, warp and the r to r+N i -1 weft yarn are interwoven in plane to form interwoven area, then convex member is inserted below the interwoven area, the interwoven area is lifted to the shape same as the i sub-area, then concave member is inserted above the interwoven area, after insertion, convex member and concave member form concave-convex cooperation structure, and the interwoven area is clamped by both.The present application can realize three-dimensional curved surface precision copying, yarn distribution precision positioning and in-situ net forming, warp and weft yarn can be straight and evenly distributed in fabric plane projection.

Description

Technical Field

[0001] This invention belongs to the field of textile technology and relates to a method for in-situ net-forming weaving of three-dimensional curved woven fabrics. Background Technology

[0002] Three-dimensional curved surface woven fabrics are a type of contoured, three-dimensional curved shell structure fabric, used in items such as helmets, shoe toes, and bras. The fibers are continuously distributed within the curved surface fabric, providing structural and strength reinforcement, and are widely used in military and civilian products. With the development of textile composite materials and rapid prototyping technology, the demand for these fabrics is increasing.

[0003] Currently, these types of decorative products are generally made by cutting and splicing. This method is not only costly, but the discontinuity of the fibers may also reduce the level of protection and shorten the product's lifespan.

[0004] Similar to traditional fabrics, contoured curved surface woven fabrics are woven from warp and weft yarns. The warp yarns are drawn out by a feed mechanism, pass through an shedding mechanism, and interweave with the weft yarns. Different shaping methods are then used to form the contoured fabric. Currently, there are three contouring methods. The first is the planar method, which converts the three-dimensional curved surface woven fabric into a multi-layered folded structure, allowing it to be woven on traditional planar looms. However, this method results in a large deviation between the formed shape and the final product, requiring post-loom molding, and is prone to wrinkling, also resulting in a high yarn density at the folded edges. The second is the variable warp density weaving method, which involves regularly varying the warp density in the warp direction using a shaped reed. This method is relatively simple and produces better results than the planar method, but the warp and weft densities are uneven, affecting the mechanical properties of the contoured fabric. Furthermore, due to shedding height limitations, it cannot weave fabrics with large changes in three-dimensional cross-section. Thirdly, there is the non-uniform take-up method, which either uses shaped take-up rollers to take up the fabric or uses multiple take-up rollers to take up the fabric simultaneously at different speeds. In this weaving principle, since the warp consumption rate is not consistent in different areas of the fabric, if shaped take-up rollers are used, the weft yarn movement at the small end of the take-up roller lags behind the weft yarn at the large end, resulting in shear deformation inside the fabric, thus forming a fabric with a curved surface structure. Although the non-uniform take-up method has a simple weaving process and good forming, and can be achieved by modifying ordinary flat looms with low loom modification costs, the take-up roller is difficult to design and manufacture, the weft force fluctuates greatly along the weft direction, and it is difficult to eliminate the shear caused by non-uniform take-up.

[0005] CN112680863A proposes a 3D curved surface fabric weaving technology. During weaving, based on the curved surface shape, the height of the heddle eye of each warp yarn is adjusted before each weft insertion. The heights of the front beam and the back beam are consistent and remain unchanged. A set of curved, identical thin plate supports with the same thickness direction as the weft yarn direction are used to assist in the forming process. During weaving, one end of the thin plate located in the area between the weft and the first row of heddle yarns is inserted into the gap between the reed teeth. This patent has inherent defects: First, the thickness of the thin plate inserted into the reed must be located between the warp yarns during forming, and the top surface of the thin plate must be higher than the plane where the warp yarns are located, except for the top of the woven curved surface. Otherwise, it cannot be formed when weaving the first half of the curved surface. This way of embedding the thin plate into the warp yarns will affect the warp yarn arrangement density in the fabric, making it impossible to achieve high warp density weaving. Moreover, there is a relationship between warp yarn density, warp yarn diameter, thickness of the support sheet, and reed specifications, which requires the process design and equipment modification to be linked. Second, when weaving three-dimensional curved surfaces, especially large curvature curved surfaces, the warp and weft yarns in the curved state have a tendency to straighten, causing the weft yarns to slip along the warp yarns and the surface of the support sheet, resulting in uneven weft density. Third, when weaving woven fabrics with different shapes of three-dimensional curved surfaces, it is necessary not only to redesign the shape of the support body, but also to design a control device for the height of the heald eye of each warp yarn at the same time, which increases production costs and process complexity. Summary of the Invention

[0006] The purpose of this invention is to solve the problems of poor forming and uneven distribution density of warp and weft yarns in the existing three-dimensional curved surface woven fabric forming technology. It proposes a weaving technology that uses a curved surface contouring rigid auxiliary mold (i.e. convex and concave parts) to achieve precise contouring of curved surfaces, precise positioning of yarn distribution and in-situ net forming, which can achieve straight and uniform distribution of warp and weft yarns in the planar projection of the fabric.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A method for in-situ net-shape forming and weaving of three-dimensional curved woven fabrics, wherein the three-dimensional curved woven fabric model includes m curved fabric regions, and the j-th curved fabric region is composed of n regions arranged sequentially along the warp direction. j The system consists of several sub-regions, j = 1, 2, ..., m. The i-th sub-region is composed of warp yarns and yarns from the r-th to the (r+N-th)-th sub-region. i It consists of -1 weft yarns, where r is the number of the first weft yarn in the i-th sub-region, i = 1, 2, ..., n j When i = 1, When i > 1 T i The width (T) of the i-th sub-region along the longitudinal direction i The value of is mainly based on the bending rigidity of the sheet, taking the fact that it does not bend under the frictional tension of the warp yarns during operation as the benchmark, where d is the diameter of the weft yarn. The weft tightness of the fabric;

[0009] When weaving the i-th sub-region, a pair of convex and concave parts are used. The specific process is as follows: first, the warp yarns are connected to the r-th to r+N-th sub-regions. i -1 After the weft yarns interweave in the plane to form an interweaving area, a convex member is inserted below the interweaving area to lift the interweaving area to the shape of the i-th sub-area. Then, a concave member is inserted above the interweaving area. After insertion, the convex member and the concave member form a convex-concave mating structure, which together clamp the interweaving area.

[0010] In-situ net-forming weaving refers to a process in which the weaving and forming processes are synchronized during the weaving of a three-dimensional curved surface. During weaving, there is no fabric roll-up movement. The formed fabric is held in a stable position by a pair of convex and concave parts fixed along the length of the loom, overcoming the forming defects caused by differences in warp tension during curling. The collaborative weaving of convex and concave parts can, on the one hand, produce a three-dimensional curved surface woven fabric that meets shape and size requirements, with a realistic curved shape; on the other hand, it can prevent lateral slippage of warp yarns on the surface of the convex parts, avoiding uneven warp yarn distribution or even localized aggregation, and achieving a uniform distribution of warp yarns on the projection plane of the three-dimensional fabric.

[0011] As a preferred technical solution:

[0012] As described above, in-situ net-forming weaving method for three-dimensional curved woven fabrics, the convex and concave parts are made of aluminum alloy or hard plastic material, and the mating surfaces of each pair of convex and concave parts are frosted surfaces, which helps to prevent yarn slippage.

[0013] In the above-described in-situ net-forming weaving method for three-dimensional curved woven fabrics, the convex and concave parts are each connected to a cylinder controlled by a solenoid valve, and the cylinder is inserted into the convex and concave parts by the solenoid valve.

[0014] The above-described method for in-situ net-forming weaving of three-dimensional curved woven fabrics employs a differentiated warp yarn supply system for warp feeding during the weaving process; the differentiated warp yarn supply system includes a support, a yarn spool, and a warp tension adjusting rod;

[0015] The support includes a left upright plate and a right upright plate, both of which are parallel to the front-to-back direction and are spaced apart horizontally.

[0016] There is one or more yarn discs, which are parallel to the left and right directions. The left end of the yarn disc is rotatably connected to the left upright plate, and the right end of the yarn disc is rotatably connected to the right upright plate.

[0017] Each yarn disc shaft has s pairs of circular rings and s warp discs, where s is a positive integer greater than or equal to 1 (the specific value of s depends on the specific number of warp yarns and the configuration process design); s pairs of circular rings are fixedly fitted onto the yarn disc shaft; each of the s warp discs corresponds one-to-one with the s pairs of circular rings, with each warp disc fitted onto its corresponding pair of circular rings with a clearance fit, and the friction between the warp discs and the circular rings is 0.1 to 2.0 N; when the yarn disc shaft rotates, the circular rings fixed on the shaft rotate synchronously, and the circular rings drive the yarn discs fitted onto the yarn disc shaft to rotate intermittently through stick-slip friction, thereby achieving tension adjustment;

[0018] There is one or more warp tension adjusting rods, the same number as the number of yarn discs. The warp tension adjusting rods are parallel to the left and right directions. The left end of the warp tension adjusting rod is fixedly connected to the left upright plate, and the right end of the warp tension adjusting rod is fixedly connected to the right upright plate. Since the warp tension adjusting rod senses the total tension of all the warp yarns on its surface, it cannot sense the warp tension of each warp disc independently. It only coordinates and adjusts the relaxation of the warp tension.

[0019] One end of each yarn spool shaft is connected to a servo motor a, which drives the yarn spool shaft to rotate in the opposite direction to the warp feed direction, so that the warp yarns always maintain tension and uniform tension during opening and flattening.

[0020] Because the warp length varies at different positions in the curved fabric area, the arc height decreases from the top to both sides, resulting in different warp lengths at corresponding positions. Therefore, the traditional warp beams with constant-length warp feeding in existing technologies cannot meet the requirements for differentiated warp feeding lengths. Furthermore, the existing differentiated warp feeding bobbins occupy a large area and rely on the passive control of individual warp tension, rather than actively tensioning the warp. This invention proposes a disc-type yarn storage and feeding system that enables independent control of individual warp yarns. One warp yarn is stored on one warp disc. According to the yarn position in the three-dimensional curved fabric, the warp discs are strung together on different yarn disc shafts. When the yarns are coplanar, the tension on the warp yarns at different positions varies, resulting in differentiated warp feeding. This difference causes each warp disc to rotate at a different angle, i.e., passive warp feeding caused by tension. This allows each warp disc to feed different warp lengths as needed, restoring the tension of all warp yarns to equilibrium. The yarn tray shaft is connected to a servo motor a, whose rotation direction is opposite to the warp feed direction. Once a warp yarn becomes slack, the shaft drives the yarn tray to rotate in the opposite direction (relative to the warp feed direction), actively winding the slack warp yarn to tighten it, thus achieving real-time control of the tension of a single warp yarn. After weaving begins, the yarn tray shaft maintains a fixed rotation speed. The friction between the plastic sheet fixed on the shaft and the yarn tray drives the slack warp tray to rotate. Once the friction force and tension reach a balance, the yarn tray slips and stops rotating, thus forming passive warp feeding and active detection and rotation to tighten the slack warp. Existing bobbins also passively feed warp, but they cannot actively detect slack warp and rotate the bobbins to tighten them. Moreover, compared to bobbins, the space occupied by the warp supply system used in this invention for the same number of warp yarns is about 1 / 6 of that of a bobbin (the thickness of each yarn tray and ring is about 1-2 cm, and the length of a common bobbin is at least 12 cm).

[0021] The above-described method for in-situ net-shape forming of three-dimensional curved woven fabric employs a variable-range parallel beat-up system during the weaving process. The variable-range parallel beat-up system includes a reed, a beam, a left drive mechanism, and a right drive mechanism.

[0022] The reeds are arranged vertically and parallel to the left and right directions;

[0023] The beam is parallel to the left and right directions;

[0024] The left and right transmission mechanisms are symmetrical structures; the right transmission mechanism includes a slider, a slide rail, and a servo motor b; the slide rail is parallel to the front-back direction; the slider is slidably connected to the slide rail, and the sliding direction is parallel to the front-back direction; the servo motor b is used to drive the slider to move in the front-back direction.

[0025] The bottom of the reed is fixedly connected to the crossbeam; the left end of the crossbeam is fixedly connected to the slider of the left transmission mechanism, and the right end of the crossbeam is fixedly connected to the slider of the right transmission mechanism.

[0026] In the in-situ net-forming forming process, the woven fabric remains in its original position. However, with each weft yarn woven in, the weft insertion point moves forward, the weft insertion stroke shortens, and the weft insertion force gradually decreases, resulting in uneven weft yarn density distribution. It is necessary to solve the forming problem caused by the movement of the weft insertion point in in-situ forming. This invention constructs a variable stroke parallel weft insertion system.

[0027] The variable-range parallel beat-up system is a system in which the plane state and movement distance of the reed are programmed and controlled by a servo motor b, compensating for beat-up force deviations caused by slight reductions in the beat-up distance. Specifically, the reed slides parallel under the drive of the servo motor b, pushing the weft yarn towards the weft inlet. The magnitude of the thrust depends on the torque of the servo motor b, rather than the length of the beat-up arm connected by the rotating cam in a traditional beat-up system. Simultaneously, the electronic control of the servo motor b enables programmed variable-range beat-up, with the amount of change in the beat-up stroke depending on the required weft density. Essentially, this system can also achieve programmed continuous variable-range beat-up.

[0028] The parallel beat-up refers to the process in which the reed plane remains upright to push the weft yarn to the weft end, which helps to reduce the tension difference between the upper and lower warp yarns and the vertical fluctuation of the weft end.

[0029] The continuously variable stroke refers to the movement of a reed fixed on a conveyor belt along a slide rail, driven by a servo motor b. The number of rotations controls the distance of movement, and this continuous stroke is achieved by changing the number of rotations during each weft insertion. The distance of movement is determined by the planar projection length of the formed fabric after each weft yarn is introduced. Using the maximum initial stroke of the reed as a reference, the reed's stroke decreases by the corresponding planar projection length of the formed fabric with each introduced weft. Thus, the position of the reed after each weft insertion and insertion is controlled through continuously variable stroke. Essentially, this is achieved by precisely controlling the number of rotations of the servo motor b to achieve a uniform change in the reed's stroke, resulting in a uniform weft yarn density in the planar projection of the formed fabric.

[0030] In the above-described in-situ net-forming weaving method for three-dimensional curved woven fabrics, the right transmission mechanism has two servo motors b. The servo motors b drive the slider to move in the front-back direction through two servo motor connecting wheels and an annular conveyor belt. The two servo motor connecting wheels are arranged with a front-back spacing, and their central axes are parallel to the left-right direction. The two ends of the annular conveyor belt are respectively fitted onto the two servo motor connecting wheels, and the middle of the annular conveyor belt is fixedly connected to the slider. The two servo motor connecting wheels are respectively fixedly fitted onto the output shafts of the two servo motors b.

[0031] The specific steps of the in-situ net-shape forming weaving method for three-dimensional curved surface woven fabrics described above are as follows:

[0032] Establish a three-dimensional curved surface woven fabric model;

[0033] The three-dimensional curved woven fabric model includes m curved fabric regions;

[0034] Design m pairs of upper and lower molds;

[0035] The shape and size of the j-th pair of upper and lower molds satisfy the following: the shape and size of the cavity after mold closing are the same as the j-th curved fabric area of ​​the three-dimensional curved woven fabric model, j = 1, 2, ..., m;

[0036] segmentation;

[0037] Divide the j-th curved fabric into n sections arranged sequentially along the warp direction. j Sub-regions;

[0038] Divide the j-th pair of upper and lower dies into n. j One concave part and n j There are convex parts, and the shape and size of the cavity after the i-th concave part and the i-th convex part are closed are the same as those of the i-th sub-region, i = 1, 2, ..., n. j The i-th sub-region consists of warp yarns and yarns from r to r+N. i Composed of -1 weft yarn;

[0039] Set the insertion timing and insertion position for the i-th concave component and the i-th convex component;

[0040] The insertion timing of the i-th concave and ith convex components is as follows: the warp yarns intersect with the warp yarns from the r-th to the r+N-th convex component. i -1 After the weft yarn has just finished interlacing; first insert the i-th convex part, then insert the i-th concave part;

[0041] The insertion positions of the i-th concave and ith convex parts satisfy the following condition: the i-th convex part will connect the warp yarns with the yarns from r to r+N. i -1 The interlacing area of ​​the weft yarn is lifted up to the shape of the i-th sub-area, and the i-th concave part and the i-th convex part are molded together;

[0042] During the weaving process, the i-th concave piece and the i-th convex piece are inserted at the insertion timing and position set in step (4).

[0043] In the above-described in-situ net-forming weaving method for three-dimensional curved woven fabrics, the concave and convex parts are placed parallel to the reed at a certain distance.

[0044] The above-described in-situ net-shape forming weaving method for three-dimensional curved woven fabrics only requires changing the concave and convex parts in pairs to achieve the weaving of different three-dimensional curved fabrics.

[0045] Beneficial effects

[0046] (1) In the process of weaving any sub-region of the curved fabric area of ​​the three-dimensional curved fabric, the convex part supports the fabric upward at the weaving point and the concave part squeezes the fabric downward at the weaving point. Thus, a pair of convex and concave parts cooperate to clamp the three-dimensional curved fabric formed by weaving, preventing the warp yarns of the woven fabric from sliding to both sides along the upper surface of the convex part when the next weft opening is introduced, and preventing the weft yarns in the woven fabric from tilting due to the differential stretching of the warp yarns with different tensions.

[0047] (2) The present invention realizes real-time adjustment of the tension of a single warp yarn by passive stretching and active reverse winding, so that the warp yarns with no elasticity or low elasticity are always kept taut and have uniform tension when the heddle is opened and flattened.

[0048] (3) The present invention uses a servo motor and a conveyor belt to control the movement of the reed, realizing the continuous change and precise control of the weft insertion stroke, and solving the problems of constant weft insertion force and on-demand weft density control;

[0049] (4) This invention realizes the automated net-forming weaving of three-dimensional curved surface woven fabrics, and solves the technical problems of uneven warp tension, uneven warp / weft density, poor forming and poor shape retention in the existing woven forming technology.

[0050] (5) As can be seen from the weaving forming principle of non-uniform winding, it is necessary to precisely design the contouring roller according to the contouring size and yarn properties, because the shear stress generated by the large opening and non-uniform winding induces the arching shape; this invention will propose a weaving forming auxiliary method that does not rely on the difference of shear stress, but uses the contouring curved surface auxiliary to achieve coplanar net forming, overcoming the technical defects of the current non-uniform winding forming.

[0051] (6) Compared with CN112680863A, this invention proposes an auxiliary forming support body with a completely separate structure and movement from the reed, so as to achieve that the thickness of the support body is independent of the gap between the reed teeth; the auxiliary forming support body is composed of convex and concave parts, which cooperate with each other to clamp the formed fabric, so as to prevent the uncontrolled slippage of warp and weft yarns near the weaving point in three-dimensional curved surface weaving, retain the traditional heald lifting mechanism and opening movement, so that only the convex and concave parts need to be changed when the variety of three-dimensional curved surface fabric is changed; the forming technology solution of the integrated differentiated warp yarn supply system with passive warp feeding and active reverse winding tension conditions is supplemented. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the three-dimensional curved woven fabric in Example 1;

[0053] Figure 2 This is a schematic diagram of the structure of a convex contour mold according to the present invention;

[0054] Figure 3This is a schematic diagram of the weaving process of the in-situ net-shape forming weaving method for three-dimensional curved surface woven fabrics in this invention;

[0055] Figure 4 This is a schematic diagram of the mold closing state of the upper and lower molds in the method of the present invention;

[0056] Figure 5 This is a schematic diagram of the differentiated warp yarn supply system in this invention;

[0057] Figure 6 This is a schematic diagram of the variable-range parallel weft insertion system in this invention;

[0058] Figure 7 This is a schematic diagram of the partitioning of the three-dimensional curved woven fabric in Example 1. In the diagram, the upward arrow points to the fixed position of the warp yarn at the fabric end, the downward arrow points to the differentiated warp feed direction, the rightward arrow at the top points to the last weft position, and the rightward arrow at the bottom points to the first weft position.

[0059] Among them, 1-convex part, 2-concave part, 3-cylinder, 4-warp tension adjusting rod, 5-warp disc, 6-yarn disc shaft, 7-steel reed, 8-crossbeam, 9-slider, 10-slide rail, 11-circular conveyor belt, 12-servo motor connecting wheel, 13-first weft plane fabric area, 14-curved fabric area, 15-second weft plane fabric area. Detailed Implementation

[0060] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0061] In the specific implementation, the directional terms are defined as follows: the direction of warp yarn transport during the weaving process is the front-to-back direction, and the direction of weft yarn transport is the left-to-right direction. These directional terms do not limit the present invention and are only intended to facilitate the description of the present invention.

[0062] A method for in-situ net-shape forming weaving of three-dimensional curved surface woven fabrics, the specific steps of which are as follows:

[0063] (1) Establish a three-dimensional curved surface woven fabric model;

[0064] The three-dimensional curved woven fabric model includes m curved fabric regions;

[0065] (2) Design m pairs of upper and lower molds;

[0066] The shape and size of the j-th pair of upper and lower molds satisfy the following: the shape and size of the cavity after mold closing are the same as the j-th curved fabric area of ​​the three-dimensional curved woven fabric model, j = 1, 2, ..., m;

[0067] (3) Division;

[0068] Divide the j-th curved fabric into n sections arranged sequentially along the warp direction. j Sub-regions;

[0069] Divide the j-th pair of upper and lower dies into one-to-one corresponding n. j One concave part and n j A convex component (such as) Figure 2 , Figure 4 As shown in the figure, the shape and size of the cavity after the i-th concave part and the i-th convex part are closed are the same as those of the i-th sub-region, i = 1, 2, ..., n j The i-th sub-region consists of warp yarns and yarns from r to r+N. i It consists of -1 weft yarns, where r is the number of the first weft yarn in the i-th sub-region. When i = 1, When i > 1 T i Let d be the width of the i-th sub-region along the warp direction, and d be the diameter of the weft yarn. The weft tightness of the fabric;

[0070] (4) Set the insertion timing and insertion position of the i-th concave part and the i-th convex part;

[0071] The insertion timing of the i-th concave and ith convex components is as follows: the warp yarns intersect with the warp yarns from the r-th to the r+N-th convex component. i -1 After the weft yarn has just finished interlacing; first insert the i-th convex part, then insert the i-th concave part;

[0072] The insertion positions of the i-th concave and ith convex parts satisfy the following condition: the i-th convex part will connect the warp yarns with the yarns from r to r+N. i -1 The interlacing area of ​​the weft yarn is raised to the shape of the i-th sub-region, and the i-th concave part and the i-th convex part are molded together, such as Figure 3 As shown, the two form a concave-convex mating structure, which together clamps the interlaced area;

[0073] (5) Weaving: During the weaving process, insert the i-th concave piece and the i-th convex piece according to the insertion timing and insertion position set in step (4).

[0074] In the above-mentioned in-situ net-forming weaving method for three-dimensional curved woven fabrics, the convex part 1 and the concave part 2 are each connected to a cylinder 3 controlled by a solenoid valve. The convex part 1 and the concave part 2 are made of aluminum alloy or hard plastic material, and the mating surfaces of each pair of convex parts 1 and concave parts 2 are frosted surfaces. During the weaving process, a differentiated warp yarn supply system is used for warp feeding, and a variable-range parallel beat-up system is used for beat-up.

[0075] like Figure 5 As shown, the differentiated warp supply system includes a support frame, a yarn spool 6, and a warp tension adjusting rod 4;

[0076] The support includes a left upright plate and a right upright plate, both of which are parallel to the front-to-back direction and are spaced apart horizontally.

[0077] There is one or more yarn disc shafts 6. The yarn disc shafts 6 are parallel to the left and right directions. The left end of the yarn disc shaft 6 is rotatably connected to the left upright plate, and the right end of the yarn disc shaft 6 is rotatably connected to the right upright plate.

[0078] Each yarn disc shaft 6 is provided with s pairs of circular rings and s warp discs 5, where s is a positive integer greater than or equal to 1; s pairs of circular rings are fixedly fitted on the yarn disc shaft 6; s warp discs 5 correspond one-to-one with s pairs of circular rings, and each warp disc 5 is fitted on the corresponding pair of circular rings with a clearance fit, and the friction between the warp disc 5 and the circular rings is 0.1 to 2.0 N;

[0079] The number of warp tension adjusting rods 4 is more than one, the same as the number of yarn disc shafts 6. The warp tension adjusting rods 4 are parallel to the left and right directions. The left end of the warp tension adjusting rod 4 is fixedly connected to the left upright plate, and the right end of the warp tension adjusting rod 4 is fixedly connected to the right upright plate.

[0080] One end of each yarn spool shaft 6 is connected to a servo motor a. The servo motor a is used to drive the yarn spool shaft 6 to rotate in the opposite direction to the warp feeding direction, so that the warp yarns always remain taut and have uniform tension during opening and flattening.

[0081] like Figure 6 As shown, the variable stroke parallel weft insertion system includes a steel reed 7, a crossbeam 8, and mutually symmetrical left and right transmission mechanisms.

[0082] The right transmission mechanism includes a slider 9, a slide rail 10, an annular conveyor belt 11, two servo motors b, and two servo motor connecting wheels 12;

[0083] The slide rail 10 is parallel to the front-back direction; the slider 9 is slidably connected to the slide rail 10, and the sliding direction is parallel to the front-back direction.

[0084] The two servo motors are connected by wheels 12 arranged with a front-to-back spacing, and their central axes are parallel to the left-to-right direction;

[0085] The two ends of the circular conveyor belt 11 are respectively fitted onto two servo motor connecting wheels 12, and the middle part of the circular conveyor belt 11 is fixedly connected to the slider 9. The two servo motor connecting wheels 12 are respectively fixedly fitted onto the output shafts of two servo motors b. The servo motors b drive the slider 9 to slide through the servo motor connecting wheels 12 and the circular conveyor belt 11.

[0086] The reed 7 is arranged vertically and parallel to the left and right directions;

[0087] The crossbeam 8 is parallel to the left and right directions;

[0088] The bottom of the reed 7 is fixedly connected to the crossbeam 8; the left end of the crossbeam 8 is fixedly connected to the slider 9 of the left transmission mechanism, and the right end of the crossbeam 8 is fixedly connected to the slider 9 of the right transmission mechanism.

[0089] Example 1

[0090] A method for in-situ net-shape forming weaving of three-dimensional curved surface woven fabrics, the specific steps of which are as follows:

[0091] (1) Establish a three-dimensional curved surface woven fabric model;

[0092] like Figure 1 and Figure 7 As shown, the three-dimensional curved woven fabric model consists of a first weft plane fabric area 13, an intermediate area, and a second weft plane fabric area 15 arranged sequentially along the warp direction. The number of curved fabric areas 14 in the intermediate area is 1.

[0093] The three-dimensional curved woven fabric model has a square edge with a side length of 15cm; the curved fabric area 14 is a hemisphere with a diameter of 10cm; the curved fabric area 14 is located in the center area, and the width of the first weft plane fabric area 13 and the second weft plane fabric area 15 along the warp direction is 2.5cm.

[0094] Both the warp and weft yarns are flat filament yarns with a width of 2mm;

[0095] In curved fabric zone 14, both the warp density and the weft density are 80%.

[0096] The fabric structure is a simple plain weave.

[0097] The first weft-oriented planar fabric area 13 consists of warp yarns and the 1st to 10th weft yarns; the middle area consists of warp yarns and the 11th to 51st weft yarns; the second weft-oriented planar fabric area 15 consists of warp yarns and the 52nd to 60th weft yarns.

[0098] (2) Design one pair of upper and lower molds;

[0099] The shapes and dimensions of the upper and lower molds satisfy the following: after mold closing, the shape and dimensions of the cavity are the same as the curved fabric area of ​​the three-dimensional curved woven fabric model, i.e. Figure 1 The hemispherical portion shown;

[0100] (3) Division;

[0101] The curved fabric is divided into 10 sub-regions arranged sequentially along the warp direction, with each sub-region having a width of 1cm along the warp direction;

[0102] The upper and lower molds are divided into 10 corresponding concave parts and 10 convex parts. The shape and size of the cavity after the i-th concave part and the i-th convex part are closed are the same as the i-th sub-region, i = 1, 2, ..., 10;

[0103] The first sub-section consists of warp yarns and the 11th to 15th weft yarns. Each sub-section is 1cm wide along the warp direction, and the fabric warp tightness is 80%. Therefore, a 1cm length of fabric is woven from warp yarns and 4 weft yarns. When the first convex piece is inserted, the fabric will conform to the top surface of the first convex piece. It is important to note that the top surface arc length of the first convex piece in the thickness direction is approximately 1.57cm. The weft density of the formed fabric after conformally covering the entire sheet will be less than 4 wefts / cm. Therefore, to prevent the reed from striking the sheet during weaving, at least 5 weft yarns should be introduced for interlacing when the first convex piece is inserted. Two sub-areas consist of warp yarns and the 16th to 19th weft yarns; the third sub-area consists of warp yarns and the 20th to 23rd weft yarns; the fourth sub-area consists of warp yarns and the 24th to 27th weft yarns; the fifth sub-area consists of warp yarns and the 28th to 31st weft yarns; the sixth sub-area consists of warp yarns and the 32nd to 35th weft yarns; the seventh sub-area consists of warp yarns and the 36th to 39th weft yarns; the eighth sub-area consists of warp yarns and the 40th to 43rd weft yarns; the ninth sub-area consists of warp yarns and the 44th to 47th weft yarns; and the tenth sub-area consists of warp yarns and the 48th to 51st weft yarns.

[0104] (4) Set the insertion timing and insertion position of the i-th concave part and the i-th convex part;

[0105] The insertion timing of the i-th concave and ith convex components is as follows: the warp yarns intersect with the warp yarns from the r-th to the r+N-th convex component. i -1 After the weft yarn has just finished interlacing; first insert the i-th convex part, then insert the i-th concave part;

[0106] The insertion positions of the i-th concave and ith convex parts satisfy the following condition: the i-th convex part will connect the warp yarns with the yarns from r to r+N. i -1 The interlacing area of ​​the weft yarn is lifted up to the shape of the i-th sub-area. The i-th concave part and the i-th convex part are molded together, forming a concave-convex mating structure, which together clamps the interlacing area.

[0107] (5) Weaving: During the weaving process, the i-th concave piece and the i-th convex piece are inserted according to the insertion timing and position set in step (4). The specific steps are as follows:

[0108] (5.1) Weave the first weft plane fabric area;

[0109] The warp yarns and the first to tenth weft yarns are interwoven in the plane to form the first weft planar fabric area;

[0110] (5.2) Weaving intermediate zone;

[0111] (5.2.1) After the warp yarns and the 11th to 15th weft yarns are interwoven in the plane to form an interwoven area, the first convex member is inserted below the interwoven area to lift the interwoven area to the shape of the first sub-area. Then, the first concave member is inserted above the interwoven area. After insertion, the first convex member and the first concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0112] (5.2.2) After the warp yarns and the 16th to 19th weft yarns are interwoven in the plane to form an interwoven area, a second convex member is inserted below the interwoven area to lift the interwoven area to the shape of the second sub-area. Then, a second concave member is inserted above the interwoven area. After insertion, the second convex member and the second concave member form a concave-convex fit structure, which together clamp the interwoven area.

[0113] (5.2.3) After the warp yarns and the 20th to 23rd weft yarns are interwoven in the plane to form an interwoven area, the third convex member is inserted below the interwoven area to lift the interwoven area to the shape of the third sub-area. Then, the third concave member is inserted above the interwoven area. After insertion, the third convex member and the third concave member form a concave-convex fit structure, which together clamp the interwoven area.

[0114] (5.2.4) After the warp yarns and the 24th to 27th weft yarns are interwoven in the plane to form an interwoven area, the fourth convex member is inserted below the interwoven area to lift the interwoven area to the shape of the fourth sub-area. Then, the fourth concave member is inserted above the interwoven area. After insertion, the fourth convex member and the fourth concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0115] (5.2.5) After the warp yarns and the 28th to 31st weft yarns are interwoven in the plane to form an interwoven area, the 5th convex piece is inserted below the interwoven area to lift the interwoven area to the shape of the 5th sub-area. Then, the 5th concave piece is inserted above the interwoven area. After insertion, the 5th convex piece and the 5th concave piece form a concave-convex mating structure, which together clamp the interwoven area.

[0116] (5.2.6) After the warp yarns and the 32nd to 35th weft yarns are interwoven in the plane to form an interwoven area, the 6th convex member is inserted below the interwoven area to lift the interwoven area to the same shape as the 6th sub-area. Then, the 6th concave member is inserted above the interwoven area. After insertion, the 6th convex member and the 6th concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0117] (5.2.7) After the warp yarns and the 36th to 39th weft yarns are interwoven in the plane to form an interwoven area, the 7th convex member is inserted below the interwoven area to lift the interwoven area to the shape of the 7th sub-area. Then, the 7th concave member is inserted above the interwoven area. After insertion, the 7th convex member and the 7th concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0118] (5.2.8) After the warp yarns and the 40th to 43rd weft yarns are interwoven in the plane to form an interwoven area, the 8th convex member is inserted below the interwoven area to lift the interwoven area to the shape of the 8th sub-area. Then, the 8th concave member is inserted above the interwoven area. After insertion, the 8th convex member and the 8th concave member form a concave-convex fit structure, which together clamp the interwoven area.

[0119] (5.2.9) After the warp yarns and the 44th to 47th weft yarns are interwoven in the plane to form an interwoven area, the 9th convex member is inserted below the interwoven area to lift the interwoven area to the shape of the 9th sub-area. Then, the 9th concave member is inserted above the interwoven area. After insertion, the 9th convex member and the 9th concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0120] (5.2.10) After the warp yarns and the 48th to 51st weft yarns are interwoven in the plane to form an interwoven area, the 10th convex member is inserted below the interwoven area to lift the interwoven area to the same shape as the 10th sub-area. Then, the 10th concave member is inserted above the interwoven area. After insertion, the 10th convex member and the 10th concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0121] (5.3) Weave the second weft plane fabric area;

[0122] The warp yarns and the 52nd to 60th weft yarns are interwoven in the plane to form the second weft planar fabric area.

[0123] Thus, the net-shape forming weaving of spherical three-dimensional fabrics has been achieved using the technology of this invention. Using the same weaving principle, but changing the shape of the contouring mold, net-shape forming weaving of curved fabrics such as shoe uppers can be achieved.

[0124] Example 2

[0125] A method for in-situ net-shape forming weaving of three-dimensional curved surface woven fabrics, the specific steps of which are as follows:

[0126] (1) Establish a three-dimensional curved surface woven fabric model;

[0127] The three-dimensional curved woven fabric model consists of a first weft plane fabric area, an intermediate area, and a second weft plane fabric area arranged sequentially along the warp direction. The number of curved fabric areas in the intermediate area is 1.

[0128] The three-dimensional curved woven fabric model has a square edge with a side length of 15cm; the curved fabric area is hemispherical with a diameter of 10cm; the curved fabric area is located in the center area, and the width of the first weft plane fabric area and the second weft plane fabric area along the warp direction is 2.5cm.

[0129] Both the warp and weft yarns are flat filament yarns with a width of 1mm;

[0130] In the curved fabric area, both the warp density and the weft density are 80%.

[0131] The fabric structure is a simple plain weave.

[0132] The first weft-oriented planar fabric area consists of warp yarns and the 1st to 20th weft yarns; the middle area consists of warp yarns and the 21st to 101st weft yarns; the second weft-oriented planar fabric area consists of warp yarns and the 102nd to 120th weft yarns.

[0133] (2) Design one pair of upper and lower molds;

[0134] The shapes and dimensions of the upper and lower molds satisfy the following: after mold closing, the shape and dimensions of the cavity are the same as the curved fabric area of ​​the three-dimensional curved woven fabric model, i.e. Figure 1 The hemispherical portion shown;

[0135] (3) Division;

[0136] The curved fabric is divided into 10 sub-regions arranged sequentially along the warp direction, with each sub-region having a width of 1cm along the warp direction;

[0137] The upper and lower molds are divided into 10 corresponding concave parts and 10 convex parts. The shape and size of the cavity after the i-th concave part and the i-th convex part are closed are the same as the i-th sub-region, i = 1, 2, ..., 10;

[0138] The first sub-section consists of warp yarns and weft yarns 21 to 29. Each sub-section is 1 cm wide along the warp direction, and the fabric warp tightness is 80%. Therefore, a 1 cm long piece of fabric is woven from warp yarns and 8 weft yarns. When the first convex piece is inserted, the fabric will conform to the top surface of the first convex piece. It is important to note that the top surface arc length of the first convex piece in the thickness direction is approximately 1.57 cm. The weft density of the formed fabric after conformally covering the entire sheet will be less than 4 wefts / cm. Therefore, to prevent the reed from striking the sheet during weaving, at least 9 weft yarns should be introduced for interlacing when the first convex piece is inserted; the second... The first sub-section consists of warp yarns and the 30th to 37th weft yarns; the second sub-section consists of warp yarns and the 38th to 45th weft yarns; the third sub-section consists of warp yarns and the 46th to 53rd weft yarns; the fourth sub-section consists of warp yarns and the 54th to 61st weft yarns; the fifth sub-section consists of warp yarns and the 54th to 61st weft yarns; the sixth sub-section consists of warp yarns and the 62nd to 69th weft yarns; the seventh sub-section consists of warp yarns and the 70th to 77th weft yarns; the eighth sub-section consists of warp yarns and the 78th to 85th weft yarns; the ninth sub-section consists of warp yarns and the 86th to 93rd weft yarns; and the tenth sub-section consists of warp yarns and the 94th to 101st weft yarns.

[0139] (4) Set the insertion timing and insertion position of the i-th concave part and the i-th convex part;

[0140] The insertion timing of the i-th concave and ith convex components is as follows: the warp yarns intersect with the warp yarns from the r-th to the r+N-th convex component. i -1 After the weft yarn has just finished interlacing; first insert the i-th convex part, then insert the i-th concave part;

[0141] The insertion positions of the i-th concave and ith convex parts satisfy the following condition: the i-th convex part will connect the warp yarns with the yarns from r to r+N. i -1 The interlacing area of ​​the weft yarn is lifted up to the shape of the i-th sub-area. The i-th concave part and the i-th convex part are molded together, forming a concave-convex mating structure, which together clamps the interlacing area.

[0142] (5) Weaving: During the weaving process, the i-th concave piece and the i-th convex piece are inserted according to the insertion timing and position set in step (4). The specific steps are as follows:

[0143] (5.1) Weave the first weft plane fabric area;

[0144] The warp yarns and the first to 20th weft yarns are interwoven in the plane to form the first weft planar fabric area;

[0145] (5.2) Weaving intermediate zone;

[0146] (5.2.1) After the warp yarns and the 21st to 29th weft yarns are interwoven in the plane to form an interwoven area, the first convex member is inserted below the interwoven area to lift the interwoven area to the shape of the first sub-area. Then, the first concave member is inserted above the interwoven area. After insertion, the first convex member and the first concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0147] (5.2.2) After the warp yarns and the 30th to 37th weft yarns are interwoven in the plane to form an interwoven area, a second convex member is inserted below the interwoven area to lift the interwoven area to the shape of the second sub-area. Then, a second concave member is inserted above the interwoven area. After insertion, the second convex member and the second concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0148] (5.2.3) After the warp yarns and the 38th to 45th weft yarns are interwoven in the plane to form an interwoven area, the third convex member is inserted below the interwoven area to lift the interwoven area to the shape of the third sub-area. Then, the third concave member is inserted above the interwoven area. After insertion, the third convex member and the third concave member form a concave-convex fit structure, which together clamp the interwoven area.

[0149] (5.2.4) After the warp yarns and the 46th to 53rd weft yarns are interwoven in the plane to form an interwoven area, the fourth convex member is inserted below the interwoven area to lift the interwoven area to the shape of the fourth sub-area. Then, the fourth concave member is inserted above the interwoven area. After insertion, the fourth convex member and the fourth concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0150] (5.2.5) After the warp yarns and the 54th to 61st weft yarns are interwoven in the plane to form an interwoven area, the 5th convex member is inserted below the interwoven area to lift the interwoven area to the shape of the 5th sub-area. Then, the 5th concave member is inserted above the interwoven area. After insertion, the 5th convex member and the 5th concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0151] (5.2.6) After the warp yarns and the 62nd to 69th weft yarns are interwoven in the plane to form an interwoven area, the 6th convex member is inserted below the interwoven area to lift the interwoven area to the same shape as the 6th sub-area. Then, the 6th concave member is inserted above the interwoven area. After insertion, the 6th convex member and the 6th concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0152] (5.2.7) After the warp yarns and the 70th to 77th weft yarns are interwoven in the plane to form an interwoven area, the 7th convex member is inserted below the interwoven area to lift the interwoven area to the shape of the 7th sub-area. Then, the 7th concave member is inserted above the interwoven area. After insertion, the 7th convex member and the 7th concave member form a concave-convex fit structure, which together clamp the interwoven area.

[0153] (5.2.8) After the warp yarns and the 78th to 85th weft yarns are interwoven in the plane to form an interwoven area, the 8th convex member is inserted below the interwoven area to lift the interwoven area to the shape of the 8th sub-area. Then, the 8th concave member is inserted above the interwoven area. After insertion, the 8th convex member and the 8th concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0154] (5.2.9) After the warp yarns and the 86th to 93rd weft yarns are interwoven in the plane to form an interwoven area, the 9th convex member is inserted below the interwoven area to lift the interwoven area to the shape of the 9th sub-area. Then, the 9th concave member is inserted above the interwoven area. After insertion, the 9th convex member and the 9th concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0155] (5.2.10) After the warp yarns and the 94th to 101st weft yarns are interwoven in the plane to form an interwoven area, the 10th convex member is inserted below the interwoven area to lift the interwoven area to the same shape as the 10th sub-area. Then, the 10th concave member is inserted above the interwoven area. After insertion, the 10th convex member and the 10th concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0156] (5.3) Weave the second weft plane fabric area;

[0157] The warp yarns and the 102nd to 120th weft yarns are interwoven in the plane to form the second weft planar fabric area.

[0158] Example 3

[0159] A method for in-situ net-shape forming weaving of three-dimensional curved surface woven fabrics, the specific steps of which are as follows:

[0160] (1) Establish a three-dimensional curved surface woven fabric model;

[0161] The three-dimensional curved woven fabric model consists of a first weft plane fabric area, an intermediate area, and a second weft plane fabric area arranged sequentially along the warp direction. The number of curved fabric areas in the intermediate area is 1.

[0162] The three-dimensional curved woven fabric model has a square edge with a side length of 15cm; the curved fabric area is hemispherical with a diameter of 10cm; the curved fabric area is located in the center area, and the width of the first weft plane fabric area and the second weft plane fabric area along the warp direction is 2.5cm.

[0163] Both the warp and weft yarns are flat filament yarns, with a warp width of 1.0 mm and a weft width of 2.0 mm.

[0164] In the curved fabric area, both the warp density and the weft density are 90%.

[0165] The fabric structure is a simple plain weave.

[0166] The first weft-oriented planar fabric area consists of warp yarns and the 1st to 12th weft yarns; the middle area consists of warp yarns and the 13th to 57th weft yarns; the second weft-oriented planar fabric area consists of warp yarns and the 53rd to 68th weft yarns.

[0167] (2) Design one pair of upper and lower molds;

[0168] The shape and size of the upper and lower molds satisfy the following: the shape and size of the cavity after mold closing are the same as the curved fabric area of ​​the three-dimensional curved woven fabric model;

[0169] (3) Division;

[0170] The curved fabric is divided into 10 sub-regions arranged sequentially along the warp direction, with each sub-region having a width of 1cm along the warp direction;

[0171] The upper and lower molds are divided into 10 corresponding concave parts and 10 convex parts. The shape and size of the cavity after the i-th concave part and the i-th convex part are closed are the same as the i-th sub-region, i = 1, 2, ..., 10;

[0172] The first sub-section consists of warp yarns and the 13th to 17th weft yarns. Each sub-section is 1cm wide along the warp direction, and the fabric warp tightness is 90%. Therefore, a 1cm length of fabric is woven from warp yarns and 5 (calculated as 4.5, rounded down to 5) weft yarns. When the first convex piece is inserted, the fabric will conform to the top surface of the first convex piece. Note that the top surface arc length of the first convex piece in the thickness direction is approximately 1.57cm. The weft density of the formed fabric after conformally covering the entire sheet will be less than 5 wefts / cm. The second sub-section consists of warp yarns and the 17th... The first sub-section consists of 8 to 22 weft yarns; the second sub-section consists of 23 to 27 weft yarns; the third sub-section consists of 28 to 32 weft yarns; the fourth sub-section consists of 33 to 37 weft yarns; the fifth sub-section consists of 33 to 37 weft yarns; the sixth sub-section consists of 38 to 42 weft yarns; the seventh sub-section consists of 43 to 47 weft yarns; the eighth sub-section consists of 48 to 52 weft yarns; the ninth sub-section consists of 53 to 57 weft yarns; and the tenth sub-section consists of 58 to 62 weft yarns.

[0173] (4) Set the insertion timing and insertion position of the i-th concave part and the i-th convex part;

[0174] The timing for inserting the i-th concave and convex parts is as follows: immediately after the warp yarn has finished interlacing with the r-th to r+Ni-1-th weft yarns; insert the i-th convex part first, then insert the i-th concave part.

[0175] The insertion positions of the i-th concave and i-th convex parts satisfy the following: the i-th convex part lifts the interlacing area of ​​the warp yarn and the r-th to r+Ni-1-th weft yarn to the shape of the i-th sub-area, and the i-th concave and i-th convex parts close together to form a concave-convex mating structure, which together clamps the interlacing area.

[0176] (5) Weaving: During the weaving process, the i-th concave piece and the i-th convex piece are inserted according to the insertion timing and position set in step (4). The specific steps are as follows:

[0177] (5.1) Weave the first weft plane fabric area;

[0178] The warp yarns and the first to 12th weft yarns are interwoven in the plane to form the first weft planar fabric area;

[0179] (5.2) Weaving intermediate zone;

[0180] (5.2.1) After the warp yarns and the 13th to 17th weft yarns are interwoven in the plane to form an interwoven area, the first convex member is inserted below the interwoven area to lift the interwoven area to the shape of the first sub-area. Then, the first concave member is inserted above the interwoven area. After insertion, the first convex member and the first concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0181] (5.2.2) After the warp yarns and the 18th to 22nd weft yarns are interwoven in the plane to form an interwoven area, a second convex member is inserted below the interwoven area to lift the interwoven area to the shape of the second sub-area. Then, a second concave member is inserted above the interwoven area. After insertion, the second convex member and the second concave member form a concave-convex fit structure, which together clamp the interwoven area.

[0182] (5.2.3) After the warp yarns and the 23rd to 27th weft yarns are interwoven in the plane to form an interwoven area, the third convex member is inserted below the interwoven area to lift the interwoven area to the shape of the third sub-area. Then, the third concave member is inserted above the interwoven area. After insertion, the third convex member and the third concave member form a concave-convex fit structure, which together clamp the interwoven area.

[0183] (5.2.4) After the warp yarns and the 28th to 32nd weft yarns are interwoven in the plane to form an interwoven area, the fourth convex member is inserted below the interwoven area to lift the interwoven area to the shape of the fourth sub-area. Then, the fourth concave member is inserted above the interwoven area. After insertion, the fourth convex member and the fourth concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0184] (5.2.5) After the warp yarns and the 33rd to 37th weft yarns are interwoven in the plane to form an interwoven area, the 5th convex member is inserted below the interwoven area to lift the interwoven area to the shape of the 5th sub-area. Then, the 5th concave member is inserted above the interwoven area. After insertion, the 5th convex member and the 5th concave member form a concave-convex fit structure, which together clamp the interwoven area.

[0185] (5.2.6) After the warp yarns and the 38th to 42nd weft yarns are interwoven in the plane to form an interwoven area, the 6th convex member is inserted below the interwoven area to lift the interwoven area to the same shape as the 6th sub-area. Then, the 6th concave member is inserted above the interwoven area. After insertion, the 6th convex member and the 6th concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0186] (5.2.7) After the warp yarns and the 43rd to 47th weft yarns are interwoven in the plane to form an interwoven area, the 7th convex member is inserted below the interwoven area to lift the interwoven area to the same shape as the 7th sub-area. Then, the 7th concave member is inserted above the interwoven area. After insertion, the 7th convex member and the 7th concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0187] (5.2.8) After the warp yarns and the 48th to 52nd weft yarns are interwoven in the plane to form an interwoven area, the 8th convex member is inserted below the interwoven area to lift the interwoven area to the shape of the 8th sub-area. Then, the 8th concave member is inserted above the interwoven area. After insertion, the 8th convex member and the 8th concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0188] (5.2.9) After the warp yarns and the 53rd to 57th weft yarns are interwoven in the plane to form an interwoven area, the 9th convex member is inserted below the interwoven area to lift the interwoven area to the same shape as the 9th sub-area. Then, the 9th concave member is inserted above the interwoven area. After insertion, the 9th convex member and the 9th concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0189] (5.2.10) After the warp yarns and the 58th to 62nd weft yarns are interwoven in the plane to form an interwoven area, the 10th convex member is inserted below the interwoven area to lift the interwoven area to the same shape as the 10th sub-area. Then, the 10th concave member is inserted above the interwoven area. After insertion, the 10th convex member and the 10th concave member form a concave-convex mating structure, which together clamp the interwoven area.

[0190] (5.3) Weave the second weft plane fabric area;

[0191] The warp yarns and the 63rd to 68th weft yarns are interwoven in the plane to form the second weft planar fabric area.

Claims

1. A net shape forming weaving method for a three-dimensional curved surface woven fabric, characterized by, The specific steps are as follows: (1) establishing a three-dimensional curved fabric model; The three-dimensional curved fabric model comprises m curved fabric areas, the jth curved fabric area is composed of n j sub-areas arranged along the warp direction in sequence, j = 1, 2, …, m, the ith sub-area is composed of warp yarns and r to r+N i -1 weft yarns, r is the number of the first weft yarn of the ith sub-area, i = 1, 2, …, n j , N i = 1+T i / d×Ø when i = 1, N i =T i / d×Ø when i > 1, T i is the width of the ith sub-area along the warp direction, d is the diameter of the weft yarn, and Ø is the weft tightness of the fabric. When weaving the ith sub-area, a pair of male and female members are used. The specific process is as follows: first, the warp yarns and the rth to r+Nth weft yarns are interlaced in the plane to form an interlaced area, then a male member is inserted below the interlaced area to lift the interlaced area to the shape of the ith sub-area, and then a female member is inserted above the interlaced area. After the insertion, the male and female members form a concave-convex matching structure, and the two members jointly hold the interlaced area. i -1 weft yarn is interlaced in the plane to form an interlaced area, then a male member is inserted below the interlaced area to lift the interlaced area to the shape of the ith sub-area, and then a female member is inserted above the interlaced area. After the insertion, the male and female members form a concave-convex matching structure, and the two members jointly hold the interlaced area; (2) designing m pairs of upper and lower molds; The shape and size of the jth pair of upper and lower molds satisfy that the shape and size of the cavity after the mold is closed are the same as the jth curved fabric area of the three-dimensional curved fabric model; (3) segmentation; The jth curved fabric region is divided into n j sub-regions arranged in sequence along the warp direction; dividing the jth pair of upper and lower molds into n j concave pieces and n j convex pieces, the shape and size of the cavity after the ith concave piece and the ith convex piece are closed are the same as the ith sub-area; (4) setting the insertion timing and insertion position of the ith concave part and the ith convex part; The insertion timing of the ith concave member and the ith convex member is: after the interlacing of the warp yarns with the rth to (r+N)th weft yarns is just finished; the ith convex member is inserted first, and then the ith concave member is inserted. i -1 weft yarn interlacing has just finished; the ith convex member is inserted first, and then the ith concave member is inserted. The insertion position of the ith concave member and the ith convex member satisfies: the ith convex member will lift the warp yarns with the rth to the r+Nth i - the interlacing area of 1 weft yarn is lifted to the shape of the ith sub-area, the ith concave member and the ith convex member are closed (5) weaving, and inserting the ith concave part and the ith convex part according to the insertion timing and insertion position set in step (4) during the weaving process.

2. A method of in situ net forming weaving of a three-dimensional curved fabric according to claim 1, characterized in that, The convex parts and the concave parts are made of aluminum alloy or hard plastic material, and the butt joint surfaces of each pair of convex parts and concave parts are frosted surfaces.

3. A method of in situ net forming weaving of a three-dimensional curved surface fabric according to claim 1, characterized in that, Each of the convex parts and the concave parts is connected with an electromagnetic valve controlled air cylinder.

4. A method of in situ net forming weaving of a three-dimensional curved fabric according to claim 1, characterized in that, During the weaving process, a differentiated warp feeding system is used for warp feeding; the differentiated warp feeding system comprises a support, a yarn disc shaft and a warp tension adjusting rod; The support comprises a left vertical plate and a right vertical plate, both of which are parallel to the front-back direction, and the left vertical plate and the right vertical plate are arranged with a left-right spacing; The number of the yarn disc shafts is one or more, the yarn disc shafts are parallel to the left-right direction, the left end of the yarn disc shaft is rotationally connected with the left vertical plate, and the right end of the yarn disc shaft is rotationally connected with the right vertical plate; Each yarn disc shaft is provided with s pairs of ring segments and s yarn discs, s is a positive integer greater than or equal to 1; the s pairs of ring segments are fixedly sleeved on the yarn disc shaft; the s yarn discs correspond to the s pairs of ring segments one by one, each yarn disc is sleeved on a corresponding pair of ring segments and is in gap cooperation with the corresponding pair of ring segments, and the friction between the yarn disc and the ring segment is 0.1-2.0 N; The number of the warp tension adjusting rods is one or more, which is the same as the number of the yarn disc shafts, the warp tension adjusting rods are parallel to the left-right direction, the left end of the warp tension adjusting rod is fixedly connected with the left vertical plate, and the right end of the warp tension adjusting rod is fixedly connected with the right vertical plate; One end of each yarn disc shaft is connected with a servo motor a, the servo motor a is used to drive the yarn disc shaft to rotate in the direction opposite to the warp feeding direction, so that the warp is always kept in a state of tension and uniform tension during shedding and flat healds.

5. A method of in situ net forming weaving of a three-dimensional curved surface fabric according to claim 1, characterized in that, During the weaving process, a variable stroke parallel beating-up system is used for beating-up; the variable stroke parallel beating-up system comprises a reed, a cross beam, a left transmission mechanism and a right transmission mechanism; The reed is vertically arranged and parallel to the left-right direction; The cross beam is parallel to the left-right direction; The left transmission mechanism and the right transmission mechanism are symmetrical structures; the right transmission mechanism comprises a sliding block, a sliding rail and a servo motor b; the sliding rail is parallel to the front-back direction; the sliding block is slidingly connected with the sliding rail, and the sliding direction is parallel to the front-back direction; the servo motor b is used to drive the sliding block to move in the front-back direction; The bottom of the reed is fixedly connected with the cross beam; the left end of the cross beam is fixedly connected with the sliding block of the left transmission mechanism, and the right end of the cross beam is fixedly connected with the sliding block of the right transmission mechanism.

6. A method of in situ net forming weaving of a three-dimensional curved surface fabric according to claim 5, characterized in that, In the right transmission mechanism, the number of the servo motors b is two, the servo motors b drive the sliding block to move in the front-back direction through two servo motor connecting wheels and an endless conveyor belt; the two servo motor connecting wheels are arranged with a front-back spacing, and the center axes of the two servo motor connecting wheels are parallel to the left-right direction; the two ends of the endless conveyor belt are sleeved on the two servo motor connecting wheels respectively, and the middle part of the endless conveyor belt is fixedly connected with the sliding block; the two servo motor connecting wheels are fixedly sleeved on the output shafts of the two servo motors b respectively.

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