CN106149168A - A kind of method for weaving of 2.5D class satin construction fabric - Google Patents

Abstract

The invention relates to a weaving method of a 2.5D satin structure fabric. The specific method is as follows: arrange the warp yarns on the multi-layer warp yarn carrier of the three-dimensional loom according to the law of rows and columns, modify the shedding device of the three-dimensional loom, design and Install a special shedding unit, especially design the heald lifting sequence and shedding stroke according to the interweaving structure characteristics of satin-like fabric warp and weft yarns, that is, to lift the warp yarn row twice, so that all warp yarn rows have a height difference, between every two layers of warp yarn Introduce the weft yarns in sequence, push the weft yarns into the fell, and realize the weaving of the fabric. By adopting the technical solution of the invention, weaving of a 2.5D satin-like structure fabric can be realized. On the surface of this 2.5D fabric, the interlacing points of warp yarns and weft yarns have the structural characteristics of flat satin fabrics, and the 2.5D satin-like fabrics have relatively fewer interlacing points of warp and weft yarns, which have better wettability, drape, and deformation. As a reinforcement, it can meet the requirements of the overall shape and performance of the fabric for curved thick-walled composite members.

Description

A kind of weaving method of 2.5D class satin structure fabric

technical field

The invention relates to a three-dimensional fabric and its weaving technology, in particular to a weaving opening device and a weaving method for a 2.5D satin structure fabric.

Background technique

Three-dimensional fabric is an integral fiber network structure formed by interweaving continuous fiber bundles in space according to certain rules by using a unique three-dimensional textile processing method. As composite reinforcements, 3D fabrics provide the structural skeleton for composite members like a building's steel frame. Three-dimensional fabric is a preformed fabric with great development potential. It is composed of structural units repeated in two-dimensional or three-dimensional directions. In addition to strengthening the composite material structurally, it can also achieve near-net formation of the composite material. type. The earliest engineering application of 3D fabrics was in the field of carbon/carbon composites. In their review article, McAllister and Lachman pointed out that in the 1960s, in order to meet the needs of the aviation industry for high-temperature structural materials that can withstand multi-directional mechanical stress and thermal stress, the earliest research was to use two-dimensional bidirectional fabrics to prepare carbon/ carbon composites. In the ensuing decade, a variety of methods were explored to improve the interlayer and in-plane mechanical properties of carbon/carbon composites, the structural form of composite reinforcement materials developed from two-dimensional to three-dimensional, and the three-dimensional fabrics had reinforcing fibers in the thickness direction. It is considered to be the most effective method to improve the bending performance, interlayer performance, impact performance and fatigue performance of composite materials, and it is also the technical key to realize the integrated design and manufacture of composite material structures. The strong demand of aero-engines for high damage-tolerant 3D fabric-reinforced composite materials drives the development of 3D fabric weaving technology. The use of 3D woven fabrics as reinforcement materials for composite fan blades can greatly improve the impact damage tolerance of blades and improve the shape of blades. properties and comprehensive mechanical properties.

As an important member of three-dimensional woven fabrics, layer-to-layer angle interlocked fabric (layer-to-layer angle interlocked fabric) is also called 2.5D structural fabric, which is composed of a series of straight weft yarns and buckled warp yarns, and the warp yarns are bundled Two adjacent "layers" of weft yarns connect multiple layers of weft yarns into a stable non-layered overall structure, and the connection of adjacent "layers" of yarns maintains the overall structure of the fabric. The biggest feature of 2.5D fabric-reinforced composite materials is that after surface processing or damage, there are still complete fiber connections in the thickness direction of the material. The 2.5D structure fabric has three variations of the weave structure, namely 2.5D plain weave structure, 2.5D twill weave structure and 2.5D satin weave structure. Currently, only 2.5D plain weave fabrics are relatively common. In order to maximize the inherent properties of the fiber, on the basis of the 2.5D structure, straightened yarns are introduced along the warp direction and z direction (fabric thickness direction) or simultaneously to form a variety of derivative structures, such as warp direction reinforcement and Normal reinforced 2.5D plain weave fabric. Ordinary multi-layer warp three-dimensional loom can weave a variety of 2.5D plain weave structure fabrics. When weaving 2.5D plain weave fabric, all the warp rows involved in weaving are divided into two groups. To complete a complete weaving cycle, two complete weft insertion processes are required, and the shedding process before each weft insertion is relatively simple. The openings required for weaving can be formed when the frame is raised and lowered to an equal-height dislocation state. The three-dimensional loom described in the patent CN202380169 U can produce 2.5D plain weave structure fabrics.

In 2.5D satin-weave structure fabric, the separate weave points on two adjacent warp yarns are far apart, independent and discontinuous, and arranged in a certain order. The appearance of 2.5D satin weave is different from that of plain weave and twill weave, and the warp and weft yarns are interwoven the least number of times. Between two adjacent warp (weft) weave points in each layer, the weft (warp) yarns float continuously on top of several warp yarns, and there are longer weft (warp) yarns "floating long lines". Therefore, 2.5D satin The surface of the fabric is smooth and uniform, with excellent deformation properties, overall properties and impregnation wettability, and is an ideal choice for preforms of composite components with constant or variable thickness surfaces, such as engine composite blades.

2.5D satin weave is a kind of 2.5D satin weave fabric, both of which have a long floating structure, but there are some differences in the weaving structure of warp and weft yarns. Figure 33 is the surface texture structure of 2.5D satin fabric with the minimum cycle number of 8, the black grid is the warp point, and the white grid is the weft point, and Figure 34 is the surface texture structure of the 2.5D satin fabric with the minimum cycle number of 8 ; There are long weft floating lines in the surface texture of the two fabrics, but the distribution of warp points of 2.5D satin-like weave is different from that of 2.5D satin weave. Figure 35 is a schematic diagram of the three-dimensional structure of a 5-layer 2.5D satin-like fabric, and Figure 36 is a schematic diagram of a three-dimensional structure of a 5-layer 2.5D satin fabric. structure, but the warp and weft yarn arrangement and interweaving structure of the two structures are different, resulting in the volume content of warp fibers in 2.5D satin weave being significantly less than that of 2.5D satin weave fabrics, and 2.5D satin weave fabrics with fewer layers It is especially obvious in , but this difference will gradually decrease as the number of layers increases.

Two adjacent rows of weft yarns in 2.5D satin fabrics are embedded in each other, and the embedded structure of adjacent weft yarns affects the structure of warp yarn binding weft yarns, greatly reducing the number of bundled weft yarn layers and reducing the angle between warp yarns and warp directions. Because the weft yarns are embedded in each other, the plane layers of weft yarns in 2.5D satin fabrics are more than those of other 2.5D structural fabrics, so that the warp and weft interlacing points in a weft yarn plane of 2.5D satin fabrics are half of that of 2.5D satin fabrics, and the overall deformation of the fabric Capability is better than 2.5D satin fabric.

Although there are literatures (Khokar, in 1997) that proposed that 2.5D fabrics have three different structures, there are no literatures and patents related to the weaving method of 2.5D satin-like fabrics. 2.5D satin fabrics have a large interweaving interval between warp and weft yarns, and a large number of heald pages are required to complete the weaving process. For a three-dimensional loom with multiple heald frames, too many heald frames increase the distance between heddle pages. The spacing of all warp yarn openings is severely restricted, greatly increasing the difficulty of weaving. At present, it is difficult to weave 2.5D satin fabrics with the shedding mechanism of ordinary three-dimensional looms. In view of this, this patent proposes to install a new type of shedding device capable of interweaving warp and weft yarns of 2.5D satin fabric on a common three-dimensional loom to weave 2.5D satin fabric. By using the principle of increasing and decreasing yarns, 2.5D satin fabrics with variable width and thickness can be woven. In addition, 2.5D plain weave, twill weave and satin weave fabrics can be woven by designing warp yarn group arrangement, warp and weft yarn interweaving law and weft insertion method. Therefore, the 2.5D satin-like structure weaving opening device and the weaving method of the present invention have the ability to weave various 2.5D structured fabrics, greatly improve the weaving efficiency, and reduce the production cost of 2.5D satin-like and short-textured fabrics.

Contents of the invention

Existing three-dimensional looms are difficult to form effective and clear openings when weaving satin fabrics, and it is more difficult to form openings on three-dimensional looms for weaving 2.5D satin fabrics with longer floating lengths. The problem of being able to efficiently weave 2.5D satin-like fabrics with complex structures. In addition, it provides a weaving method capable of weaving a 2.5D satin-like three-dimensional fabric for turbofan blades, which can weave a 2.5D satin-like fabric with excellent deformability in the warp and weft directions, which is suitable as the basic structure of the turbofan blade fabric, and Simplifies the weaving method, saves time and manpower, and lays a good foundation for mass production.

In the following, the warp yarn array is the m×n rectangular array formed by all the warp yarns participating in weaving; the warp yarn row is a row of warp yarns that penetrate into the same heald; Warp columns are grouped.

The equipment used for weaving 2.5D satin-like three-dimensional fabrics for turbofan blades according to the present invention is to transform the existing three-dimensional looms, and its main frame is the same as that of the three-dimensional looms, mainly to transform the opening mechanism of the three-dimensional fabric , making it suitable for weaving 2.5D satin fabrics and other types of 2.5D fabrics. The opening mechanism is composed of five parts: a grouping rod, a displacement device, a heald, a heddle fixing device and a heald limiting device. The components are as follows:

(1) Grouping rod: a stainless steel bar with a diameter of 5 mm and a length of 2 m; group all warp rows participating in interweaving, and divide all warp rows with the same interweaving rule into groups with reference to the minimum cycle number N of the organizational structure One group, divided into N groups, in addition to ensure that the heddle eyes with the same position are at the same level;

(2) Displacement device: It is a mesh-shaped device with a length of 60-70cm, a width of 15cm, and a displacement of 5cm. The grouping rods can be lifted in sequence and put into the small cells of the mesh device to realize the equal-movement lifting function. ; control the lifting of warp rows with the same number of groups by grouping rods; after lifting and lowering the corresponding warp groups according to the law, all the warp rows form the opening of the 2.5D class satin three-dimensional fabric for weaving turbofan blades;

(3) Heald: It is a kind of porous eye heald, the distance between adjacent heald eyes is 5cm, and the number of eyes is 20 to 50, which can ensure that all warp yarns participating in weaving pass through the heddle eyes, so that all warp yarns form a clear layer;

(4) Heald fixing device: a group of strip-shaped porous devices that constrain the healds to move only in the up and down direction. All healds need to be constrained in the same plane;

(5) Heald restricting device: an elastic device with a length of 1.1-1.2m; it restricts the movement of the healds in their respective vertical displacement channels to prevent entanglement between adjacent heddles.

On the three-dimensional loom with this opening mechanism, use the following steps to weave 2.5D class satin fabrics, the specific steps are:

(1) On the three-dimensional loom, all the warp yarns pass through the porous healds and are fixed on the yarn carrier to form a rectangular array of m×n; 1 spaced arrangement;

(2) connect porous heddles with grouping rods, group all warp yarn columns, with reference to the minimum number of cycles N of tissue structure, warp yarn columns are divided into N groups; warp yarns in the same warp yarn group have the same lifting law;

(3) According to the fabric structure, the specific warp yarn group is lifted twice successively to form an effective and clear opening; the opening can be divided into two types, as follows:

1) Control the grouping bar and the displacement device to perform the following steps: ①. Raise the specific warp yarn group by one stroke to form an effective and clear weaving gap; ②. Raise the warp yarn group and other specific warp yarn groups in ① by one stroke , forming the remaining m effective fabric falls; after two lifts, all warp yarn groups form a total of m+1 effective openings, and these openings have clear layers;

2) Control the grouping bar and the displacement device to perform the following steps: ①. Raise the specific warp yarn group by one stroke to form an effective clear weaving gap; ②. Raise the warp yarn group and other specific warp yarn groups in ① by one stroke Form the remaining m-1 effective fabric falls; all warp yarn groups form a total of m effective openings after two lifts, and these openings have a clear layering;

The second promotion is based on the first promotion;

(4) Introduce the weft yarn in the clear opening, drop the lifted warp yarn back to the initial position to form warp and weft yarn interweaving, and beat the weft to complete one weft weaving;

(5) Steps (3) and (4) are repeated N times to complete one weaving cycle of the fabric.

The patent of the present invention uses a special opening device and a weaving method to realize the weaving of a 2.5D satin-like three-dimensional fabric for turbofan blades. The shedding device can ensure that all warp yarns form clear openings during the same process of weaving. Use the shedding device to lift the warp yarns corresponding to the openings twice to form an effective clear opening for weaving. Weft yarns can be introduced into the effective clear openings to achieve interweaving Effect. It can also raise and lower the corresponding warp yarn group according to the structure to realize other 2.5D structural fabric weaving, such as plain weave, twill weave and satin weave 2.5D fabric. The 2.5D satin fabric for turbofan blades woven by using this patented equipment and method has a special structure. The biggest difference from other 2.5D fabrics is that both warp and weft yarns have a buckling state, and the degree of buckling is smaller than other 2.5D fabrics. The floating long thread enables the yarn to move in a small range in the warp and weft direction and the thickness direction, which endows the fabric with good bending and torsional deformation capabilities.

Description of drawings

Fig. 1 is a schematic diagram of the right side view of the three-dimensional loom device of the present invention.

In Fig. 1, a is the traction coiling device, b is the beating device, c is the warp, d is the displacement device, e is the grouping rod, f is the heddle, g is the heddle fixing device, h is the tension control device, i is the heddle limiting device, j is the warp guiding device, o is a displacement travel distance, and P is the peripheral structure of the three-dimensional loom.

Fig. 2 is a schematic front view of the three-dimensional loom device of the present invention. In Figure 2, b is the beating device, e is the grouping rod, f is the heald, g is the heddle fixing device, h is the tension control device, i is the heddle limiting device, j is the warp guiding device, and k is the heald eye .

Figure 3. An m×N open loop warp array.

Figures 4 and 5 are schematic diagrams of the first type of opening process.

6 and 7 are schematic diagrams of the second type of opening process.

Fig. 8 is a diagram of a complete loop warp arrangement, in which numbers 1 to 8 represent eight warp groups respectively.

Figures 9, 10, and 11 show the whole process of warp and weft yarn movement when weaving the first weft, where A1-A5 represent five effective clear openings, and 9 represents the weft yarn introduced into the weaving fell.

Figures 12, 13, and 14 show the whole process of warp and weft yarn movement when the second weft weaving is completed, wherein B1-B4 represent four effective clear openings, and 10 represents the weft yarn introduced into the fabric fell.

Figures 15, 16, and 17 show the whole process of warp and weft yarn movement when weaving the third weft, where C1-C5 represent five effective clear openings, and 11 represents the weft yarn introduced into the weft fell.

Figures 18, 19, and 20 are the same process of warp and weft yarn movement when the fourth weft weaving is completed, wherein D1-D4 represent four effective clear openings, and 12 represents the weft yarn introduced into the weaving fell.

Figures 21, 22, and 23 show the whole process of warp and weft yarn movement when weaving the fifth weft, where E1-E5 represent five effective clear openings, and 13 represents the weft yarn introduced into the weaving fell.

Figures 24, 25, and 26 are the same process of warp and weft yarn movement when weaving the sixth weft, wherein F1-F4 represent four effective clear openings, and 14 represents the weft yarn introduced into the weaving fell.

Figures 27, 28, and 29 are the same process of warp and weft yarn movement when weaving the seventh weft, wherein G1-G5 represent five effective clear openings, and 15 represents the weft yarn introduced into the weaving fell.

Figures 30, 31, and 32 are the same process of warp and weft yarn movement when weaving the eighth weft, wherein H1-H4 represent four effective clear openings, and 16 represents the weft yarn introduced into the weaving fell.

Figures 33 and 34 are the surface textures of 2.5D satin-like fabric and 2.5D satin fabric respectively.

Figures 35 and 36 are three-dimensional schematic diagrams of 2.5D satin-like fabric and 2.5D satin fabric, respectively.

detailed description

Preparatory stage before weaving:

Using carbon fiber as the raw material, one heddle is threaded through m warp yarns, and one heald is threaded through m-1 warp yarns at intervals to form a rectangular array of m×n. After the hedging is completed, all the warp yarn rows are numbered 1 to N along the weft direction, and the healds are connected with grouping rods for grouping, and the warp yarn rows with the same number are divided into one group, and they are divided into N groups; Finally, put the grouping rod into the word displacement device, as shown in Figure 1; the numbering of the grouping rod and the warp row is consistent, and the lifting grouping rod can control the position with the same numbered warp row. Adjust the tension control device to ensure that all warp yarns participating in weaving form m-1 clear layers in the initial state, and the layering effect is shown in Figure 1. Adjust the heald limiting device and the heald fixing device to ensure that all the healds participating in weaving can move in the vertical direction and do not intertwine with each other.

Weaving stage:

As shown in Fig. 3, the m×N array is an open loop unit, which is also the initial state of the warp on the 3D loom. The fabric structure and warp yarn array determine that when weaving 2.5D satin fabrics, the openings can be divided into two types, and the weaving process is as follows:

The first type of opening. Control the grouping rod and the displacement device to carry out the following steps: ①, as shown in Figure (4), raise the specific warp yarn group by one stroke, and form an effective clear weaving gap 1; ②, as shown in Figure (5), move the The raised warp yarn group and the rest of the specific warp yarn groups are lifted by another stroke to form an effective cloth fell of 2~m+1; after two lifts, all warp yarn groups form m+1 effective openings, and these openings have the same height and have a clear layered.

The second type of opening. Control the grouping rod and the displacement device to carry out the following steps: ①, as shown in Figure (6), raise the specific warp yarn group by one stroke to form an effective clear weaving gap 1; ②, as shown in Figure (7), lift the middle of ① The warp yarn group and other specific warp yarn groups are lifted by one stroke to form an effective cloth fell of 2-m; after two lifts, all warp yarn groups form a total of m effective openings, and these openings are of the same height and have clear layers;

A complete shedding process is as follows: initial state→the first lifting of the warp yarn group→the second lifting of the warp yarn group→weft insertion→weft beating→the warp yarn row returns to the initial state. To weave a complete cycle, it is necessary to complete N times of shedding process, repeating the shedding and beating process can complete the weaving of 2.5D satin weave.

Example

The structure of a three-dimensional fabric is determined by the interweaving relationship of the warp and weft yarns in the fabric, that is to say, during the fabric weaving process, the openings formed by lifting and lowering different warp yarn columns can weave fabrics of different structures. The shedding process described in this patent is to raise and lower different warp yarn rows under a specially arranged warp yarn group, and lift it twice to realize the shedding required for weaving 2.5D satin weave. Describe the weaving process of a kind of 4-layer 2.5D satin weave fabric that the minimum number of cycles N is 8 in the embodiment, the fabric parameters are shown in Table 1, and this method is also applicable to the weaving of the 2.5D satin weave fabric that the minimum number of cycles N is N Weaving.

Preparatory stage before weaving:

1. Using carbon fiber as the raw material, one heald wears 4 yarns, and one heald wears 3 yarns at intervals to form a 4×n array; the 4×8 array shown in Figure 8 is 4× A loop in n, where the label inside the circle is the number of the warp yarn group where each column of warp yarn is located, and the number is 1~8.

2. After the heald is finished, all the warp rows are divided into 8 groups, and the warp rows with the same label are fixed on the grouping rods through the heddles. The grouping rods have the same number as the fixed warp rows, and all the warp rows have their own number, as shown in Figure 3. Etc. stroke lifting grouping stick just can wait for the controlled warp row of stroke lifting grouping stick.

3. Adjust the tension control device to ensure that all warp yarns participating in weaving form four clear warp yarn layers, and the layering effect is shown in Figure 1.

4. Adjust the heald limiting device and the heald fixing device to ensure that all the healds involved in weaving can move in the vertical direction and do not intertwine with each other.

Weaving stage:

During the whole weaving process, all warp yarn groups will form eight kinds of openings in turn: A, B, C, D, E, F, G and H; , F and H are one class; after forming effective openings, continuous weft yarns are respectively introduced. All the warp yarns are arranged on the three-dimensional loom as shown in Figure 8 after being processed in the preparation stage. The arrangement state of the warp yarns in Figure 8 is called the initial state, and the process of a complete opening is: initial state→the first lifting of the warp yarn row→the second warp yarn row Second lifting→weft insertion→weft beating→warp yarn row returns to the initial state. The opening methods of the eight types of openings are introduced in turn:

A opening: through the grouping rod and the displacement device, the No. 1 warp yarn group is raised by a stroke, as shown in Figure 9, so that the No. 1 warp yarn group and the unmoved warp yarn group form a stroke difference, and an effective clear opening A1 is produced; The No. 1, 4, 5, 6, and 7 warp yarn groups are raised by another stroke through the grouping rod and the displacement device. As shown in Figure 10, the No. 1 warp yarn group and the unmoved warp yarn group form two stroke differences. , No. 6 and No. 7 warp yarn groups form a stroke difference with the unmoved warp yarn group, and produce effective clear fabric fells A2, A3, A4 and A5; the two lifting warp yarn groups raise a total of five effective clear openings.

A opening weft insertion: five effective clear openings A1~A5 are formed after lifting the corresponding warp yarn group twice. In Figure 11, 9 represents the weft yarn introduced into the A-type weft fell, and the No. 9 weft yarn is sequentially introduced into five effective openings according to the order in the figure. In the clear opening of the weft, the weft is beaten to complete the weaving of the first weft.

B opening: through the grouping rod and the displacement device, the No. 1, 5 and 6 warp yarn groups are raised by one stroke, as shown in Figure 12, so that the No. 1, 5 and 6 warp yarn groups and the unmoved warp yarn groups form a stroke difference, and Produce an effective clear opening B1; through the grouping rod and the displacement device, the No. 1, 2, 3, 4, 5, 6 and 7 warp yarn groups are raised by another stroke, as shown in Figure 13, No. 1, 5 and 6 warp yarns No. 2, 3, 4 and 7 warp yarn groups form one stroke difference with the unmoved warp yarn group, and produce effective fells B2, B3 and B4; the warp yarn groups are raised twice A total of four effective clear openings are formed.

B opening weft insertion: after lifting the corresponding warp yarn group twice to form four effective clear openings B1~B4, 10 in Figure 14 represents the weft yarn introduced into the B-type weft, and the No. In the clear opening of the weft, the weft is beaten to complete the weaving of the second weft.

C opening: through the grouping rod and the displacement device, the No. 5 warp yarn group is raised by one stroke, as shown in Figure 15, so that the No. 5 warp yarn group and the unmoved warp yarn group form a stroke difference, and an effective clear opening C1 is produced; The No. 1, 2, 3, 5, and 6 warp yarn groups are raised by another stroke through the grouping rod and the displacement device. As shown in Figure 16, the No. 5 warp yarn group and the unmoved warp yarn group form two stroke differences. , No. 3 and No. 6 warp yarn groups form a stroke difference with the unmoved warp yarn groups, and produce effective fabric fells C2, C3, C4 and C5; two lifting warp yarn groups form five effective clear openings in total.

C opening weft insertion: five effective clear openings C1~C5 are formed after lifting the corresponding warp yarn group twice respectively. In Figure 17, 11 represents the weft yarn introduced into the C-type weft, and the No. 11 weft yarn is sequentially introduced into five effective openings according to the order in the figure. In the clear opening of the weft, the third weft weaving is completed by beating up.

D opening: through the grouping rod and the displacement device, the No. 2, No. 3 and No. 5 warp yarn groups are raised by one stroke, as shown in Figure 18, so that No. 2, No. 3 and No. 5 warp yarn groups form a stroke difference with the unmoved warp yarn group, and Produce an effective clear opening D1; through the grouping rod and the displacement device, the warp yarn groups 1, 2, 3, 5, 6, 7 and 8 are raised by another stroke, as shown in Figure 19, warp yarns 2, 3 and 5 No. 1, 6, 7, and 8 warp yarn groups form one stroke difference with the unmoved warp yarn group, and produce effective fabric fells D2, D3, and D4; the warp yarn row is lifted twice A total of four effective clear openings are formed.

D-opening weft insertion: four effective clear openings of D1 to D4 are formed after lifting the corresponding warp yarn group twice. In Figure 20, 12 represents the weft yarn introduced into the D-type weft, and the No. 12 weft yarn is sequentially introduced into four effective weft yarns according to the order in the figure. In the clear opening of the weft, the weft is beaten to complete the weaving of the fourth weft.

E opening: through the grouping rod and the displacement device, the No. 3 warp yarn group is raised by one stroke, as shown in Figure 21, so that the No. 3 warp yarn group and the unmoved warp yarn group form a stroke difference, and an effective clear opening E1 is produced; No. 2, 3, 5, 7 and 8 warp yarn groups are raised by another stroke by grouping rods and displacement devices. As shown in Figure 22, the No. 3 warp yarn group and the unmoved warp yarn group form two stroke differences. , No. 7 and No. 8 warp yarn groups form a stroke difference with the unmoved warp yarn groups, and produce effective fabric fells E2, E3, E4 and E5; two lifting warp yarn groups form five effective clear openings in total.

E-opening weft insertion: After lifting the corresponding warp yarn groups twice, five effective clear openings E1 to E5 are formed. In Figure 23, 13 represents the weft yarn introduced into the E-type weft, and the No. 13 weft yarn is sequentially introduced into five effective weft yarns in the order shown in the figure. In the clear opening of the weft, the weft is beaten to complete the weaving of the fifth weft.

F opening: through the grouping rod and the displacement device, the No. 3, 7 and 8 warp yarn groups are raised by one stroke, as shown in Figure 24, so that the No. 3, 7 and 8 warp yarn groups and the unmoved warp yarn groups form a stroke difference, and Create an effective clear opening F1; through the grouping rod and displacement device, the groups of warp yarns 1, 2, 3, 4, 5, 7 and 8 are raised by another stroke, as shown in Figure 25, warp yarns 3, 7 and 8 No. 1, 2, 4 and 5 warp yarn groups form one stroke difference with the unmoved warp yarn group, and produce effective fabric fells F2, F3 and F4; the warp yarn groups are raised twice A total of four effective clear openings are formed.

F opening weft insertion: After lifting the corresponding warp yarn group twice, four effective clear openings F1 to F4 are formed. In Figure 26, 14 represents the weft yarn introduced into the F-type weft, and the No. 14 weft yarn is sequentially introduced into four effective openings according to the order in the figure. In the clear opening of the weft, the sixth weft weaving is completed by beating up.

G opening: through the grouping rod and the displacement device, the No. 7 warp group is raised by one stroke, as shown in Figure 27, so that the No. 7 warp group and the unmoved warp group form a stroke difference, and an effective clear opening G1 is produced ; No. 1, 3, 4, 7 and 8 warp yarn groups are promoted by grouping rods and displacement devices by another stroke, as shown in Figure 28, No. 7 warp yarn groups form two stroke differences with unmoved warp yarn groups, 1, No. 3, 4, and 8 warp groups form a stroke difference with the unmoved warp groups, and produce effective gaps G2, G3, G4, and G5; two lifting warp groups form five effective clear openings in total.

G opening weft insertion: five effective clear openings of G1~G5 are formed after lifting the corresponding warp yarn group twice. In Figure 29, 15 represents the weft yarn introduced into the G-type weft fell, and the No. 15 weft yarn is sequentially introduced into five effective openings according to the order in the figure. In the clear opening of the weft, weaving is completed by beating up the seventh weft.

H opening: through the grouping rod and the displacement device, the No. 1, No. 4 and No. 7 warp yarn groups are raised by one stroke, as shown in Figure 30, so that No. 3, No. 7 and No. 8 warp yarn groups form a stroke difference with the unmoved warp yarn group, and Produce an effective clear opening F1; through the grouping rod and displacement device, the groups of warp yarns 1, 3, 4, 5, 6, 7 and 8 are raised by another stroke, as shown in Figure 31, warp yarns 1, 4 and 7 No. 3, 5, 6 and 8 warp yarn groups form one stroke difference with the unmoved warp yarn group, and produce effective fells H2, H3 and H4; the warp yarn groups are raised twice A total of four effective clear openings are formed.

H-opening weft insertion: four effective clear openings of H1 to H4 are formed after lifting the corresponding warp yarn group twice. In Figure 32, 16 represents the weft yarn introduced into the H-type weft, and the No. 16 weft yarn is sequentially introduced into four effective weft yarns according to the order in the figure. In the clear opening of the weft, the weaving of the eighth weft is completed by beating up.

Figures 9 to 32 show a complete weaving cycle process with a minimum number of cycles of 8. Repeating the above 8 types of openings can complete the weaving of the entire fabric. For weaving other 2.5D structured three-dimensional fabrics with any thickness, the purpose of weaving can be achieved only by increasing the number of warp yarn layers, redesigning the arrangement of warp yarn columns, lifting times and lifting strokes, and weaving parameters.

Table 1

raw material carbon fiber Fabric Size(mm) 200×100×2 Yarn specification Warp: 6K Weft 6K fabric density Warp density: 8 threads/cm Weft density: 6 threads/cm debit number 40 teeth/10cm Warp and weft layers 4 floors 80 columns fabric thickness 2mm

Claims (3)

1. A shedding device for 2.5D class satin structure fabrics, the shedding device is made up of five parts: a grouping bar, a displacement device, a heald, a heald fixing device and a heddle restricting device. 2. A weaving method of a 2.5D class satin structure fabric, on the three-dimensional loom equipped with the opening device described in right 1, the weaving steps of the 2.5D class satin structure fabric are: (1) on the three-dimensional loom, All the warp yarns pass through the porous healds and are fixed on the yarn carrier to form a rectangular array, and the number of yarns in two adjacent warp yarn columns is one; (2) connect the porous healds with grouping rods, and group the warp yarn columns , the warp yarns in the same warp yarn group have the same lifting law; (3) according to the fabric structure, the specific warp yarn group is lifted twice to form an effective clear opening; (4) the weft yarn is introduced into the clear opening, and the raised warp yarn is returned to the Drop to the initial position to form warp and weft yarn interweaving, and beat the weft to complete one weft weaving; (5) Repeat step (4) multiple times according to the minimum number of cycles to complete one weaving cycle of the fabric. 3. described in claim 1 and 2 is a kind of opening device of 2.5D class satin weave fabric and weaving process thereof, the lifting sequence of designing warp and weft yarn array arrangement, warp yarn group and warp yarn row can realize a kind of 2.5 Weaving of class D satin structure fabrics. Weaving of other 2.5D structural fabrics can be realized by designing warp and weft arrays, warp lifting times, warp group lifting strokes, and warp column lifting sequences.