A manufacturing method for a preform of an equal-thickness three-dimensional woven beam structure

Abstract

The invention discloses a manufacturing method for a preform of an equal-thickness three-dimensional woven beam structure. In the beam structure, the warp yarn specifications from the warp yarns in the rib plate to the warp yarns in each wing plate do not need to be changed. The weft yarn layers inside the rib plate in the beam structure are evenly divided into two or more parts and respectively penetrate into two or more wing plates of the beam structure, so that the weft yarns in the rib plate are continuous with the weft yarns in each wing plate. At the same time, through the heald lifting and shedding, additional weft yarns that only penetrate between two wing plates are added to make the thickness of the rib plate and each wing plate equal, realizing the integrated weaving of the beam structure preform. The invention realizes the integrated weaving of the beam structure preform while ensuring the uniformity of the overall performance.

Description

Technical Field

[0001] The present invention relates to the field of three-dimensional woven composites, and particularly to a method for manufacturing a preform of an equal-thickness three-dimensional woven beam structure. Background Art

[0002] Stereo fabrics are preform fabrics with great development potential. They are fiber network structures formed by interweaving continuous fiber bundles in a three-dimensional space according to certain rules by using unique three-dimensional textile processing methods. Their most prominent feature is that components with complex shapes can be manufactured by three-dimensional weaving, greatly improving the interlaminar shear strength and damage tolerance of composites, and they are widely used in aerospace and other fields.

[0003] Currently, for the preparation of preforms of T-shaped and H-shaped beam structures, the method of multi-layer folding weaving and then unfolding is usually adopted, that is, on a traditional loom, by changing the path of the binding yarn, a three-dimensional planar preform with partial bifurcation is woven, and after being taken off the loom, it is folded into a three-dimensional beam structure. The weft yarns in the rib plate continue to the flange plate. In this way, the number of weft yarn layers in the flange plate is half of that in the rib plate, resulting in a situation where the rib plate is thick and the flange plate is thin. If it is manufactured by the method of changing the local warp yarn specifications, the thickness change is limited, and the overall uniformity of the preform will also be affected. For beam structures with equal thickness of rib plates and flange plates, the prior patent "Method for manufacturing a preform for forming a fiber-reinforced resin beam, its manufacturing device and method for manufacturing a fiber-reinforced resin beam (EP2119544A1)" proposes that after flattening and multi-layer folding weaving and then unfolding the beam structure, a flat plate with a certain thickness is manufactured separately and sewn to the flange plate to realize an equal-thickness T-shaped and H-shaped beam preform. However, for the beam-shaped preform prepared by this method, during the load-bearing working condition of the beam-shaped component, delamination is likely to occur easily between the flange plate and the sewn flat plate preform during use. There is also a prior patent "A T-shaped structure fiber needle-punched preform (CN110820169B)" which proposes to prepare an equal-thickness beam structure preform by fiber cloth lamination needle punching, but it also faces the defect of weak strength between fiber cloths, and delamination is likely to occur easily during use. In addition, the prior patent "Fiber structure and fiber-reinforced composite material (US10544525B2)" proposes to manufacture an integral T-shaped preform by crossing warp and weft yarns at the intersection of the rib plate and the wing plate. Although the preparation of an equal-thickness T-shaped beam structure preform is realized, the rib plate and the wing plate are only connected by local yarns and are extremely likely to separate from each other. The above invention patents around the three-dimensional woven beam structure technology are all developed to solve the thickness problem of the beam structure preform, but they all face the problem of weak interlayer strength. Summary of the Invention

[0004] The object of the present invention is to provide a manufacturing method for a preform of an equal-thickness three-dimensional woven beam structure, to solve the problem of weak interlayer strength in the prior art, and to integrally weave a preform of an equal-thickness beam structure with uniform overall performance while keeping the yarn specifications of the warp yarn system equal in each area of the preform.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A manufacturing method for a preform of an equal-thickness three-dimensional woven beam structure. In this method, the warp yarn specifications from the ribs to the wing plates in the beam structure do not need to change. The internal weft yarn layer in the ribs of the beam structure is evenly divided into two or more parts and respectively penetrates into two or more wing plates of the beam structure to ensure the continuity of the weft yarns in the ribs and the weft yarns in each wing plate. At the same time, through the design of lifting harness and shedding, additional weft yarns that only penetrate between two wing plates are added to ensure that the ribs and each wing plate have equal thickness, achieving the integral weaving of the beam structure preform while ensuring integrity; wherein the beam structure is a T-shaped beam or an H-shaped beam.

[0006] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention evenly divides the internal weft yarn layer in the ribs of the beam structure into two or more parts and respectively penetrates into two or more wing plates of the beam structure while keeping the yarn specifications of the warp yarn system equal in each area of the beam structure preform, ensuring the continuity of the weft yarns in the ribs and the weft yarns in each wing plate. At the same time, through the design of lifting harness and shedding, additional weft yarns that only penetrate between two wing plates are added to ensure that the ribs and each wing plate have equal thickness, achieving the integral weaving of the beam structure preform while ensuring the overall performance and solving the problem of weak interlayer strength in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the weft yarn path of the flattened weaving of the equal-thickness T-shaped beam preform of the present invention.

[0008] Figure 2 It is a schematic diagram of the weft yarn path after the equal-thickness T-shaped beam preform of the present invention is unfolded.

[0009] Figure 3 It is a schematic diagram of the operation of adding additional weft yarns to the equal-thickness T-shaped beam preform of the present invention.

[0010] Figure 4 It is a schematic diagram of the weft yarn path inside the equal-thickness H-shaped beam preform of the present invention.

[0011] Figure 5 It is a schematic diagram of the weft yarn path after the equal-thickness H-shaped beam preform of the present invention is unfolded.

[0012] Figure 6 It is a schematic diagram of the operation of adding additional weft yarns to the equal-thickness H-shaped beam preform of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] This embodiment provides a method for integrally manufacturing a three-dimensional woven beam structure preform with equal yarn specification ratios and equal thicknesses in each region. Combining Figures 1 to 3 During the manufacturing process of the T-beam preform with equal thickness, the T-beam is flattened and divided into two parts, i.e., the rib plate and the laminated wing plate, in the width direction. The rib plate is a one-piece fabric in the thickness direction, and the wing plate part is divided into two equal-thickness fabrics, upper and lower, for manufacturing.

[0014] The number of weft yarn layers in the rib plate part is equally divided into the two laminated wing plates being manufactured to ensure the continuity of the surface weft yarn 1 of the T-beam in the rib plate and the internal weft yarn 2 of the T-beam to the wing plate.

[0015] To achieve equal thickness of the rib plate and the wing plate and the same yarn specification of each system in the rib plate and the wing plate, the number of warp yarn layers in both wing plate parts is the same as that in the rib plate part.

[0016] The surface weft yarn 1 of the T-beam in the rib plate part and the internal weft yarn 2 of the T-beam continuously penetrate into the wing plate, and the wing plate adds an additional T-shaped weft yarn 3 to achieve structural integrity. It should be noted that each additional weft yarn only penetrates through two layers of the wing plate and is not manufactured into the rib plate preform.

[0017] Figure 3 Explanation of the method for each additional T-shaped weft yarn 3 of the T-beam only penetrating through two layers of the wing plate and not being manufactured into the rib plate: The shuttle is used to carry the weft yarn for weft insertion. Before the first introduction of the additional T-shaped weft yarn 3 of the T-beam into the wing plate, the warp yarns in the rib plate part sink without shedding, and the warp yarns of the upper wing plate in the laminated wing plate part shed. The weft yarn is introduced through the rib plate and the wing plate. When the warp yarns move again, the warp yarns in the rib plate part remain sinking without shedding, and the warp yarns of the lower wing plate in the laminated wing plate part shed to introduce the weft yarn. Subsequently, the temporary T-shaped weft yarn 4 remaining in the rib plate is taken out, and only the additional T-shaped weft yarn 3 of the T-beam is retained in the upper and lower wing plates.

[0018] Combining Figures 4 to 6 During the manufacturing process of the H-beam preform with equal thickness, the H-beam is flattened and divided into laminated wing plate - rib plate - laminated wing plate laminated parts in the width direction. The rib plate is a one-piece fabric in the thickness direction, and the wing plate parts on both left and right sides are each divided into two equal-thickness fabrics, upper and lower.

[0019] The number of warp yarn layers in the rib plate part is equally divided into the two laminated wing plates on the left and right for manufacturing to ensure the continuity of the surface warp yarn 5 of the H-beam in the rib plate and the internal weft yarn 6 of the H-beam to the wing plate.

[0020] To achieve equal thickness of the rib plate and the wing plate and the same yarn specification of each system in the rib plate and the wing plate, the number of warp yarn layers in both left and right wing plate parts is the same as that in the rib plate part.

[0021] The surface warp yarns 5 of the H-beam at the rib plate part and the internal weft yarns 6 of the H-beam continuously penetrate into the left and right wing plates, and then additional weft yarns 7 on the right side of the H-beam and additional weft yarns 8 on the left side of the H-beam are added to achieve structural integrity. It should be noted that each additional weft yarn only penetrates two layers of wing plates on the left or right side and is not made into the rib plate preform.

[0022] Figure 6 Description of the method for the additional weft yarns 7 on the right side of the H-beam and the additional weft yarns 8 on the left side of the H-beam that only penetrate two layers of wing plates on the left or right side and are not made into the rib plate: The shuttle is used to carry the weft yarn for weft insertion. Before the additional weft yarn 7 on the right side of the wing plate H-beam is first introduced on the right side, the warp yarns at the rib plate and the left wing plate parts sink and do not form an opening, and the warp yarns of the upper wing plate at the right laminated wing plate part form an opening, and the weft yarn is introduced. When the warp yarns of the right wing plate move again, the warp yarns at the left flange and the rib plate parts sink and do not form an opening and remain unchanged, and the warp yarns of the lower wing plate at the right laminated wing plate part form an opening, and the same weft yarn is introduced. Subsequently, the temporary weft yarn 9 of the H-beam remaining outside is taken out, and only the additional weft yarn 7 on the right side of the H-beam added is retained in the upper and lower wing plates. After completion, the same operation is performed to add the additional weft yarn 8 on the left side of the H-beam of the left flange.

[0023] Example 1

[0024] Taking the weaving of an isothickness T-beam preform with a thickness of 3 mm as an example, the preparation method of the present invention is further described.

[0025] A weaving method for an isothickness T-beam preform is as follows:

[0026] (1) The known conditions are as follows: The raw material is HF30F-12K (780 tex) carbon fiber, the T-beam interlacing structure is a one-three twill, the rib plate width is 50 mm, the wing plate is 50 mm, the length is 100 mm, and the fiber volume fraction of the preform is set to 55 ± 2%;

[0027] (2) The isothickness T-beam is flattened and manufactured, and is divided into two parts: the rib plate - laminated wing plate along the width direction. Among them, the rib plate is a one-piece fabric in the thickness direction, and the wing plate part is divided into two equal-thickness fabrics, the upper and lower ones. According to the known conditions, the warp density, weft density, warp yarn specifications, weft yarn specifications, the number of warp yarn layers, and the number of weft yarn layers of each part are designed. The design results are shown in the following table:

[0028]

[0029] (3) Warp yarn tying, 3 layers of warp yarns are tied at the rib plate part along the width direction, and 6 layers of warp yarns are tied at the laminated wing plate part;

[0030] (4) Weft insertion and weaving, the shuttle is used to carry the weft yarn for weft insertion;

[0031] (5) The first heald lifting: the warp yarns in the rib area sink without forming a shed, and the warp yarns in the wing area form a shed according to the interlacing rule of the 1 / 3 twill structure. The opening position of the warp yarns in the wing area is the fourth layer of the weft yarn, and the weft yarn is introduced.

[0032] (6) The second heald lifting: the warp yarns in the rib area sink without forming a shed, and the warp yarns in the wing area form a shed according to the interlacing rule of the 1 / 3 twill structure. The opening position of the warp yarns in the wing area is the fifth layer of the weft yarn. The weft yarn introduced for the first time is reversely introduced into this opening, and the weft yarn remaining outside is tightened so that the weft yarn only penetrates the wing fabric.

[0033] (7) The third heald lifting: the warp yarns in the rib area sink without forming a shed, and the warp yarns in the wing area form a shed according to the interlacing rule of the 1 / 3 twill structure. The opening position of the warp yarns in the wing area is the third layer of the weft yarn, and the weft yarn is introduced.

[0034] (8) The fourth heald lifting: the warp yarns in the rib area sink without forming a shed, and the warp yarns in the wing area form a shed according to the interlacing rule of the 1 / 3 twill structure. The opening position of the warp yarns in the wing area is the sixth layer of the weft yarn. The weft yarn introduced for the third time is reversely introduced into this opening, and the weft yarn remaining outside is tightened so that the weft yarn only penetrates the wing fabric.

[0035] (9) The fifth heald lifting: the warp yarns in both the rib and wing areas form a shed according to the interlacing rule of the 1 / 3 twill structure. The opening position of the warp yarns in the rib area is the first layer of the weft yarn, and the opening position of the warp yarns in the wing area is the first layer of the weft yarn. The weft yarn passes through the rib and wing areas.

[0036] (10) The sixth heald lifting: the warp yarns in both the rib and wing areas form a shed according to the interlacing rule of the 1 / 3 twill structure. The opening position of the warp yarns in the rib area is the third layer of the weft yarn, and the opening position of the warp yarns in the wing area is the second layer of the weft yarn. The weft yarn passes through the rib and wing areas.

[0037] (11) The seventh heald lifting: the warp yarns in both the rib and wing areas form a shed according to the interlacing rule of the 1 / 3 twill structure. The opening position of the warp yarns in the rib area is the second layer of the weft yarn, and the opening position of the warp yarns in the wing area is the seventh layer of the weft yarn. The weft yarn passes through the rib and wing areas.

[0038] (12) The eighth heald lifting: the warp yarns in both the rib and wing areas form a shed according to the interlacing rule of the 1 / 3 twill structure. The opening position of the warp yarns in the rib area is the fourth layer of the weft yarn, and the opening position of the warp yarns in the wing area is the eighth layer of the weft yarn. The weft yarn passes through the rib and wing areas.

[0039] (13) One weft weaving is completed. Repeat the above eight times of heald lifting and weft insertion until the weaving is completed.

[0040] (14) Take off the loom and unfold it into a T-beam preform.

[0041] Example 2:

[0042] Taking the weaving of an equal-thickness H-beam preform with a thickness of 4.5 mm as an example, the preparation method of the present invention will be further described.

[0043] A weaving method for an equal-thickness H-beam preform is as follows:

[0044] (1) The known conditions are as follows: The raw material is CCF800G-12K (515 tex) carbon fiber, the H-beam interweaving structure is a one-three twill, the rib plate width is 100 mm, the wing plate is 100 mm, the length is 100 mm, and the fiber volume fraction of the preform is set to 55 ± 2%;

[0045] (2) Flatten the equal-thickness H-beam for manufacturing, and divide it into three parts along the width direction: laminated wing plate - rib plate - laminated wing plate. Among them, the rib plate is a one-piece fabric in the thickness direction, and both the left and right wing plate parts are divided into two equal-thickness fabrics. According to the known conditions, design the warp density, weft density, warp yarn specifications, weft yarn specifications, number of warp yarn layers, and number of weft yarn layers for each part. The design results are shown in the following table:

[0046]

[0047]

[0048] (3) Tie the warp yarns. Along the width direction, tie 5 layers of warp yarns in the rib plate part and 10 layers of warp yarns in the laminated wing plate part;

[0049] (4) Insert the weft. Use a shuttle to carry the weft yarn for insertion;

[0050] (5) First harness lift. The warp yarns in the rib plate and the right wing plate areas sink without shedding, and the warp yarns in the left wing plate area shed according to the interweaving law of the one-three twill structure. The shedding position of the warp yarns in the left wing plate area is the sixth layer of the weft yarn, and the weft yarn is introduced;

[0051] (6) Second harness lift. The warp yarns in the rib plate and the right wing plate areas sink without shedding, and the warp yarns in the left wing plate area shed according to the interweaving law of the one-three twill structure. The shedding position of the warp yarns in the left wing plate area is the seventh layer of the weft yarn. The weft yarn introduced for the first time is reversely introduced into this shed, and the weft yarn remaining outside is tightened, so that the weft yarn only penetrates the left wing plate fabric;

[0052] (7) Third harness lift. The warp yarns in the rib plate and the right wing plate areas sink without shedding, and the warp yarns in the left wing plate area shed according to the interweaving law of the one-three twill structure. The shedding position of the warp yarns in the left wing plate area is the fifth layer of the weft yarn, and the weft yarn is introduced;

[0053] (8) The fourth heald lifting: the warp yarns in the rib plate and the right wing plate areas sink without shedding, and the warp yarns in the left wing plate area shed according to the interlacing law of the 1 / 3 twill structure. The shedding position of the warp yarns in the left wing plate area is the eighth layer of the weft yarn. The weft yarn introduced in the third time is reversely introduced into this shed, and the weft yarn remaining outside is tightened, so that the weft yarn only penetrates the fabric of the left wing plate;

[0054] (9) The fifth heald lifting: the warp yarns in the rib plate and the right wing plate areas sink without shedding, and the warp yarns in the left wing plate area shed according to the interlacing law of the 1 / 3 twill structure. The shedding position of the warp yarns in the left wing plate area is the fourth layer of the weft yarn. The weft yarn is introduced;

[0055] (10) The sixth heald lifting: the warp yarns in the rib plate and the right wing plate areas sink without shedding, and the warp yarns in the left wing plate area shed according to the interlacing law of the 1 / 3 twill structure. The shedding position of the warp yarns in the left wing plate area is the ninth layer of the weft yarn. The weft yarn introduced in the fifth time is reversely introduced into this shed, and the weft yarn remaining outside is tightened, so that the weft yarn only penetrates the fabric of the left wing plate;

[0056] (11) The seventh heald lifting: the warp yarns in the rib plate and the left wing plate areas sink without shedding, and the warp yarns in the right wing plate area shed according to the interlacing law of the 1 / 3 twill structure. The shedding position of the warp yarns in the right wing plate area is the sixth layer of the weft yarn. The weft yarn is introduced;

[0057] (12) The eighth heald lifting: the warp yarns in the rib plate and the left wing plate areas sink without shedding, and the warp yarns in the right wing plate area shed according to the interlacing law of the 1 / 3 twill structure. The shedding position of the warp yarns in the right wing plate area is the seventh layer of the weft yarn. The weft yarn introduced in the seventh time is reversely introduced into this shed, and the weft yarn remaining outside is tightened, so that the weft yarn only penetrates the fabric of the right wing plate;

[0058] (13) The ninth heald lifting: the warp yarns in the rib plate and the left wing plate areas sink without shedding, and the warp yarns in the right wing plate area shed according to the interlacing law of the 1 / 3 twill structure. The shedding position of the warp yarns in the right wing plate area is the fifth layer of the weft yarn. The weft yarn is introduced;

[0059] (14) The tenth heald lifting: the warp yarns in the rib plate and the left wing plate areas sink without shedding, and the warp yarns in the right wing plate area shed according to the interlacing law of the 1 / 3 twill structure. The shedding position of the warp yarns in the right wing plate area is the eighth layer of the weft yarn. The weft yarn introduced in the ninth time is reversely introduced into this shed, and the weft yarn remaining outside is tightened, so that the weft yarn only penetrates the fabric of the right wing plate;

[0060] (15) The eleventh heald lifting: the warp yarns in the rib plate and the left wing plate areas sink without shedding, and the warp yarns in the right wing plate area shed according to the interlacing law of the 1 / 3 twill structure. The shedding position of the warp yarns in the right wing plate area is the fourth layer of the weft yarn. The weft yarn is introduced;

[0061] (16) The twelfth heald lifting: The warp yarns in the rib plate and the left wing plate areas sink without shedding, while the warp yarns in the right wing plate area shed according to the interlacing pattern of the 1 / 3 twill structure. The shedding position of the warp yarns in the right wing plate area is the ninth layer of the weft yarn. The weft yarn introduced in the eleventh time is reversely introduced into this shed, and the weft yarn remaining outside is tightened, so that the weft yarn only penetrates the fabric of the right wing plate;

[0062] (17) The thirteenth heald lifting: The warp yarns in the rib plate and both wing plate areas shed according to the interlacing pattern of the 1 / 3 twill structure. The shedding position of the warp yarns in the rib plate area is the first layer of the weft yarn, and the shedding position of the warp yarns in both wing plate areas is the first layer of the weft yarn. The weft yarn passes through the rib plate and both wing plate areas;

[0063] (18) The fourteenth heald lifting: The warp yarns in the rib plate and both wing plate areas shed according to the interlacing pattern of the 1 / 3 twill structure. The shedding position of the warp yarns in the rib plate area is the fourth layer of the weft yarn, and the shedding position of the warp yarns in both wing plate areas is the second layer of the weft yarn. The weft yarn passes through the rib plate and the wing plate areas;

[0064] (19) The fifteenth heald lifting: The warp yarns in the rib plate and both wing plate areas shed according to the interlacing pattern of the 1 / 3 twill structure. The shedding position of the warp yarns in the rib plate area is the fifth layer of the weft yarn, and the shedding position of the warp yarns in both wing plate areas is the third layer of the weft yarn. The weft yarn passes through the rib plate and the wing plate areas;

[0065] (20) The sixteenth heald lifting: The warp yarns in the rib plate and both wing plate areas shed according to the interlacing pattern of the 1 / 3 twill structure. The shedding position of the warp yarns in the rib plate area is the second layer of the weft yarn, and the shedding position of the warp yarns in both wing plate areas is the tenth layer of the weft yarn. The weft yarn passes through the rib plate and the wing plate areas;

[0066] (21) The seventeenth heald lifting: The warp yarns in the rib plate and both wing plate areas shed according to the interlacing pattern of the 1 / 3 twill structure. The shedding position of the warp yarns in the rib plate area is the third layer of the weft yarn, and the shedding position of the warp yarns in both wing plate areas is the eleventh layer of the weft yarn. The weft yarn passes through the rib plate and the wing plate areas;

[0067] (22) The eighteenth heald lifting: The warp yarns in the rib plate and both wing plate areas shed according to the interlacing pattern of the 1 / 3 twill structure. The shedding position of the warp yarns in the rib plate area is the sixth layer of the weft yarn, and the shedding position of the warp yarns in both wing plate areas is the twelfth layer of the weft yarn. The weft yarn passes through the rib plate and the wing plate areas;

[0068] (23) One weft weaving is completed. Repeat the above eighteen times of heald lifting and weft insertion until the weaving is completed;

[0069] (24) Unwind from the loom to form an H-beam preform.

Claims

1. A manufacturing method of a preform of an equal-thickness three-dimensional woven beam structure, characterized in that, Divide the weft layer inside the rib plate in the beam structure into two or more parts, and penetrate them into two or more wing plates of the beam structure respectively, so that the weft yarns in the rib plate and the weft yarns in each wing plate are continuous and have the same specifications. Through heald lifting and shedding, add extra weft yarns that only penetrate two wing plates pairwise to make the rib plate and each wing plate have the same thickness, and carry out the integrated weaving of the beam structure preform; The beam structure is a T-shaped beam or an H-shaped beam; During the manufacturing process of the T-shaped beam preform, flatten the T-shaped beam. Along the width direction, it is divided into two parts: the rib plate - laminated wing plate. Among them, the thickness direction of the rib plate is an integral fabric, and the wing plate part is made of two fabrics with equal thickness up and down; In the rib plate part, the number of weft layers is equally divided into two laminated wing plates, so that the surface weft yarn (1) of the T-shaped beam in the rib plate and the internal weft yarn (2) of the T-shaped beam are continuous to the wing plate; For both wing plate parts, the number of warp and weft layers is the same as that in the rib plate part; The surface weft yarn (1) of the T-shaped beam in the rib plate part and the internal weft yarn (2) of the T-shaped beam continuously penetrate into the wing plate, and then add the extra weft yarn (3) of the wing plate T-shaped beam to achieve structural integrity; The extra weft yarn (3) of the T-shaped beam only penetrates two layers of wing plates and is not made into the rib plate preform; The method that each extra weft yarn (3) of the T-shaped beam only penetrates two layers of wing plates and is not made into the rib plate preform is as follows: Use a shuttle to carry the weft yarn for weft insertion. Before the extra weft yarn (3) of the T-shaped beam is first introduced into the wing plate, the warp yarns in the rib plate part sink and do not shed, and the warp yarns of the upper wing plate in the laminated wing plate part shed. The weft yarn is introduced through the rib plate and the wing plate. When the warp yarns move again, the warp yarns in the rib plate part remain sunk and do not shed, and the warp yarns of the lower wing plate in the laminated wing plate part shed, and the weft yarn is introduced. Subsequently, the temporary weft yarn (4) of the T-shaped beam remaining in the rib plate is taken out, and only the added extra weft yarn (3) of the T-shaped beam is retained in the upper and lower wing plates; During the manufacturing process of the H-shaped beam preform, flatten the H-shaped beam. Along the width direction, it is a laminated part of laminated wing plate - rib plate - laminated wing plate. Among them, the thickness direction of the rib plate is an integral fabric, and the wing plate parts on both left and right sides are each divided into two fabrics with equal thickness up and down; In the rib plate part, the number of warp layers is equally divided into two laminated wing plates on the left and right, and at the same time, the surface weft yarn (5) of the H-shaped beam in the rib plate and the internal weft yarn (6) of the H-shaped beam are continuous to the wing plate; For the two wing plate parts on the left and right sides, the number of warp and weft layers is the same as that in the rib plate part; The surface weft yarn (5) of the H-shaped beam in the rib plate part and the internal weft yarn (6) of the H-shaped beam continuously penetrate into the wing plates on the left and right sides, and then add the extra weft yarn (7) on the right side of the H-shaped beam and the extra weft yarn (8) on the left side of the H-shaped beam to achieve structural integrity; The extra weft yarn (7) on the right side of the H-shaped beam and the extra weft yarn (8) on the left side of the H-shaped beam only penetrate two layers of wing plates on the left or right side and are not made into the rib plate preform; The method for the additional weft yarns (7) on the right side of the H-beam and the additional weft yarns (8) on the left side of the H-beam to only penetrate through two layers of flange plates and not be made into the rib plate preform is as follows: The shuttle is used to carry the weft yarn for weft insertion. Before the additional weft yarn (8) on the left side of the H-beam of the right flange plate is first introduced, the warp yarns at the rib plate and the left flange plate parts sink without shedding, and the warp yarns of the upper sheet of the right laminated flange plate part shed. After the weft yarn is introduced, when the warp yarns of the right flange plate move again, the warp yarns at the left flange edge and the rib plate part remain sinking without shedding, and the warp yarns of the lower sheet of the right laminated flange plate part shed to introduce the same weft yarn. Subsequently, the temporary weft yarn (9) of the H-beam remaining outside is taken out, and only the additional weft yarn (8) on the left side of the H-beam is retained in the upper and lower flange plates. After completion, the same operation is performed to complete the penetration of the additional weft yarn (7) on the right side of the H-beam through the right flange plate.

2. A method for manufacturing a preform of an equal-thickness three-dimensional woven beam structure according to claim 1, characterized in that, The shedding is performed multiple times, and the warp yarns in the rib plate or flange plate area are shed according to the shedding law of the interlacing structure of the beam structure.

3. The manufacturing method of an isotropic three-dimensional woven beam structure preform according to claim 2, characterized in that, The interlacing structure of the beam structure is a 1 / 3 twill.

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