Knitting process of convex three-dimensional knitted prefabricated part and convex three-dimensional knitted prefabricated part

Abstract

The invention provides a knitting process of a convex three-dimensional knitted prefabricated member and the convex three-dimensional knitted prefabricated member. The convex three-dimensional knitted prefabricated member comprises a main body part and a convex part, the knitting technology comprises the steps that the multiple yarn carriers are arranged into a knitting matrix, and the knitting matrix comprises a first knitting matrix corresponding to the protruding part and comprising N1 columns of yarn carriers; the second weaving matrix corresponds to the main body part and comprises N2 columns of yarn carriers, and N2 is larger than N1; the yarn carriers of the first knitting matrix and the second knitting matrix are aligned in the column direction, and the column tail protruding yarn carriers of the first knitting matrix and the column head protruding yarn carriers of the second knitting matrix are located in the same row; and weaving according to a three-dimensional four-step method to form the convex three-dimensional woven prefabricated part. Therefore, the yarns of the convex part and the main body part can be wound at the junction of the convex part and the main body part, and the convex part and the main body part are connected into a whole, so that the integral forming weaving of the convex three-dimensional woven prefabricated member is realized, and the overall performance of a composite convex product is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of weaving technology, and in particular, relates to a weaving technology for a convex three-dimensional weaving preform, and also relates to a convex three-dimensional weaving preform. Background Art

[0002] Fiber reinforced composite materials are made by laying or winding reinforcing fiber materials (such as glass fiber, carbon fiber, aramid fiber, etc.) with matrix materials at a certain angle and in a certain order to form a layered structure, so they are also called laminated or laminated composite materials. Fiber reinforced composite materials are widely used in the fields of construction, bridges, roads, oceans, hydraulic structures and underground structures. However, the interlayer shear strength of laminated composite materials is low, and it is easy to cause interlayer damage under the action of interlayer stress, thereby causing the destruction of the laminated composite material structure.

[0003] Three-dimensional braided structural composite materials are composite materials formed by using three-dimensional braiding technology to weave fiber bundles into the shape of the required structure to form a three-dimensional braided preform, and then using the three-dimensional braided preform as a reinforcing skeleton for impregnation and curing. In this type of structure, the fiber bundles are interlaced and interwoven in space to form an overall preformed structure, thereby introducing reinforcing fibers in the thickness direction, improving the interlaminar shear strength and damage tolerance of the composite material, so it will not delaminate.

[0004] The composite material convex product comprises a main body part and a convex part arranged on one side of the main body part, the main body part and the convex part are connected as a whole, and the width of the convex part is smaller than that of the main body part.

[0005] The composite convex products currently popular or promoted in the market can generally be made in three ways: the first way is to use resin impregnation molding after lamination in the thickness direction; the second way is to weave to form three-dimensional woven preforms corresponding to the main part and the convex part respectively, and then splice the two, and then dip and cure the spliced ​​preformed structural parts; the third way is to weave to form a three-dimensional woven preform with a rectangular structure, and then dip and cure the three-dimensional woven preform with a rectangular structure and then cut it to form a convex shape.

[0006] However, the interlayer bonding force of the composite material convex product produced by the first method is weak; the shear strength of the connection between the main part and the convex part of the composite material convex product produced by the second method is poor, and the main part and the convex part of the convex product are easy to separate; for the composite material convex product produced by the third method, the cutting process will damage the fibers of the material and affect the overall performance of the composite material convex product.

[0007] Therefore, designing a weaving process for a convex three-dimensional woven preform that can realize the integral molding and weaving of a preform for a convex composite product has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0008] The present invention provides a weaving process for a convex three-dimensional woven preform. By setting a weaving matrix including a first weaving matrix corresponding to a convex part and a second weaving matrix corresponding to a main part, and arranging the protruding yarn carriers at the end of the first weaving matrix and the protruding yarn carriers at the beginning of the second weaving matrix to be located in the same row, the yarns of the convex part and the main part can be entangled with each other at the junction of the two during the three-dimensional weaving process, and the convex part and the main part are connected as one, thereby solving the problems in the prior art of poor overall performance and low safety of composite material convex products caused by the need to splice the three-dimensional woven preforms corresponding to the main part and the convex part respectively, or the need to cut the three-dimensional woven preforms after they are impregnated and cured.

[0009] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0010] A weaving process of a convex three-dimensional weaving preform, wherein the convex three-dimensional weaving preform comprises a main body portion and a convex portion; a plurality of yarn carriers are arranged into a weaving matrix, and the weaving matrix comprises:

[0011] A first weaving matrix, corresponding to the raised portion, includes an N1 row of yarn carriers;

[0012] The second weaving matrix, corresponding to the main body, includes N2 rows of yarn carriers, N2 being greater than N1;

[0013] The yarn carriers of the first weaving matrix and the second weaving matrix are aligned in the column, and the protruding yarn carriers at the end of the column of the first weaving matrix and the protruding yarn carriers at the beginning of the column of the second weaving matrix are located in the same row;

[0014] The three-dimensional four-step weaving method is used to form a convex three-dimensional woven preform.

[0015] Furthermore, when weaving according to the three-dimensional four-step method, the first weaving matrix and the second weaving matrix are respectively shifted in rows and synchronously shifted in columns, so that the main body of the convex three-dimensional woven preform is connected and woven with the convex part.

[0016] Further, the protruding yarn carrier at the end of the first weaving matrix and the protruding yarn carrier at the beginning of the second weaving matrix are located in the same row, forming a connecting row of yarn carriers;

[0017] The row of yarn carriers adjacent to the connecting row of yarn carriers in the first weaving matrix and the row of yarn carriers adjacent to the connecting row of yarn carriers in the second weaving matrix have the same moving direction;

[0018] Preferably, the first weaving matrix and the second weaving matrix are provided with columns of protruding yarn carriers, and the yarn carriers of each column are aligned one by one in the column direction;

[0019] Preferably, the protruding yarn carriers at the end of the first weaving matrix and the protruding yarn carriers at the beginning of the corresponding second weaving matrix are aligned in the row direction and are staggered.

[0020] Further, the first weaving matrix includes an M1 row of yarn carriers;

[0021] When M1 is an odd number:

[0022] The protruding yarn carrier at the beginning of a row of the first weaving matrix and the protruding yarn carrier at the beginning of a row of the second weaving matrix are respectively arranged in odd-numbered rows or even-numbered rows of the first weaving matrix and the second weaving matrix;

[0023] When M1 is an even number:

[0024] If the protruding yarn carriers at the beginning of the rows of the first weaving matrix are arranged at the odd rows of the second weaving matrix, then the protruding yarn carriers at the beginning of the rows of the second weaving matrix are arranged at the even rows of the second weaving matrix;

[0025] If the protruding yarn carriers at the beginning of a row of the first weaving matrix are arranged at the even-numbered rows of the second weaving matrix, then the protruding yarn carriers at the beginning of a row of the second weaving matrix are arranged at the odd-numbered rows of the second weaving matrix.

[0026] Further, the three-dimensional four-step method includes:

[0027] In the first step, the first weaving matrix and the second weaving matrix are respectively shifted in rows, and the yarn carriers in adjacent rows are alternately shifted by one position along the row direction, and the row of yarn carriers adjacent to the connecting row yarn carrier in the first weaving matrix and the row of yarn carriers adjacent to the connecting row yarn carrier in the second weaving matrix have the same shift direction;

[0028] In the second step, the first weaving matrix and the second weaving matrix are synchronously shifted in columns, and the yarn carriers of adjacent columns are alternately moved one position in the column direction;

[0029] In the third step, the first weaving matrix and the second weaving matrix are shifted respectively, and the shifting direction is opposite to that in the first step;

[0030] In the fourth step, the first weaving matrix and the second weaving matrix are synchronously shifted in columns, and the direction of the column shifting is opposite to that in the second step.

[0031] Further, the following steps are included:

[0032] S1: The yarn carriers are in a flatbed arrangement state: a first yarn carrier in the (M1+1)th row and the (N1+1)th column and a second yarn carrier in the (M2+1)th row and the (N2+1)th column are arranged in a one-to-one correspondence;

[0033] S2: threading: passing the yarn through the yarn carrier and introducing it into the weaving area;

[0034] S3: staggered: forming a weaving matrix;

[0035] S4: weaving according to the three-dimensional four-step method;

[0036] Preferably, after the trains are offset, the (M1+1)-row and (N1+1)-column first yarn carriers form a first weaving matrix having M1-row and N1-column yarn carriers, and the (M2+1)-row and (N2+1)-column second yarn carriers form a first weaving matrix having M2-row and N2-column yarn carriers.

[0037] Furthermore, the missed train includes:

[0038] The transverse car uniformly arranges the rows of the first yarn carriers and the second yarn carriers in the column direction, and moves the first yarn carriers and the second yarn carriers with odd or even serial numbers in the same direction by one position;

[0039] After vertical and horizontal machining, N2 rows of second yarn carriers are formed, and the odd or even rows of the second yarn carriers are shifted one position in the same direction, and the first yarn carriers in the same row as the second yarn carriers that are shifted in the row are shifted one position in the same direction to form a weaving matrix.

[0040] Further, a protruding portion is provided on the main body portion, and the first woven matrix is ​​provided with a corresponding protruding portion; or,

[0041] The main body is provided with a plurality of convex parts arranged at intervals, and the first weaving matrix is ​​provided with a plurality of convex parts corresponding one to one.

[0042] Furthermore, the yarn carrier realizes rotational movement under the drive of the weaving station, and the weaving station rotates around its axis while driving the yarn carrier to rotate around the weaving station, so that the yarn carrier changes position;

[0043] Preferably, the weaving station drives a yarn carrier to rotate 90° at a time.

[0044] The present invention also provides a convex three-dimensional braided preform, which is woven using the above-mentioned weaving method for the convex three-dimensional braided preform.

[0045] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0046] The present invention arranges a weaving matrix including a first weaving matrix corresponding to the raised part and a second weaving matrix corresponding to the main part, and arranges the protruding yarn carriers at the end of the first weaving matrix and the protruding yarn carriers at the beginning of the second weaving matrix to be located in the same row. In the process of three-dimensional weaving according to the three-dimensional four-step method, the yarns of the raised part and the main part can be entangled at the junction of the two, and the raised part and the main part are connected as one, thereby realizing the one-piece weaving of the convex three-dimensional weaving preform, which can ensure the connection stability between the raised part and the main part, and the integrity of the weaving structure, and reduces the use of connecting components, thereby improving the overall performance of the composite material convex product and providing great protection for the safety of the composite material convex product.

[0047] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0049] Figure 1 It is a schematic diagram of the distribution of the yarn carrier and the weaving station when the flat car is arranged in the embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram of the distribution of the yarn carrier behind the transverse car and the weaving station in an embodiment of the present invention;

[0051] Figure 3 This is a schematic diagram of the distribution of the yarn carrier behind the vertical car and the weaving station in an embodiment of the present invention;

[0052] Figure 4 Schematic diagram of the movement direction of the yarn carrier in the first step of the three-dimensional four-step method in an embodiment of the present invention;

[0053] Figure 5 It is an action diagram of the weaving station during the first step of the three-dimensional four-step method in an embodiment of the present invention and a distribution diagram of the weaving station after the operation is completed;

[0054] Figure 6 A schematic diagram of the movement direction of the yarn carrier in the second step of the three-dimensional four-step method in an embodiment of the present invention;

[0055] Figure 7 It is a schematic diagram of the movement of the weaving stations during the second step of the three-dimensional four-step method according to an embodiment of the present invention and the distribution of the weaving stations after the operation is completed;

[0056] Figure 8 A schematic diagram of the movement direction of the yarn carrier in the third step of the three-dimensional four-step method in an embodiment of the present invention;

[0057] Fig. 9 It is a schematic diagram of the movement of the weaving stations during the third step of the three-dimensional four-step method in an embodiment of the present invention and the distribution of the weaving stations after the operation is completed;

[0058] Fig.10 A schematic diagram of the movement direction of the yarn carrier in the fourth step of the three-dimensional four-step method in an embodiment of the present invention;

[0059] Fig.11 It is a schematic diagram of the movement of the weaving stations during the fourth step of the three-dimensional four-step method in an embodiment of the present invention and the distribution of the weaving stations after the operation is completed;

[0060] Fig.12 A cross-sectional view of a convex three-dimensional braided preform when a convex portion is provided in an embodiment of the present invention;

[0061] Fig.13 It is a cross-sectional view of a convex three-dimensional woven preform when two convex portions are provided in an embodiment of the present invention.

[0062] Description of the main components in the figure: 1. The first yarn carrier; 11. The first auxiliary yarn carrier; 2. The second yarn carrier; 21. The second auxiliary yarn carrier; 31. The protruding yarn carrier at the head of the column of the first weaving matrix; 32. The protruding yarn carrier at the end of the column of the first weaving matrix; 33. The protruding yarn carrier at the head of the row of the first weaving matrix; 34. The protruding yarn carrier at the end of the row of the first weaving matrix; 41. The protruding yarn carrier at the head of the column of the second weaving matrix; 42. The protruding yarn carrier at the end of the column of the second weaving matrix; 43. The protruding yarn carrier at the head of the row of the second weaving matrix; 44. The protruding yarn carrier at the end of the row of the second weaving matrix; 5. Connecting row yarn carrier; 6. Weaving station; 7. First direction; 81. Main part; 82. Raised part.

[0063] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0065] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0066] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] like Figures 1 to 13 As shown, in an embodiment of the present invention, a weaving process for a convex three-dimensional weaving preform is introduced.

[0068] The convex three-dimensional woven preform includes a main body portion 81 and a convex portion 82. The convex portion 82 is connected to one side of the main body portion 81. The width of the convex portion 82 is smaller than the width of the main body portion 81. The cross-section of the convex three-dimensional woven preform is as follows: Fig.12 and Fig.13 shown.

[0069] In this embodiment, the weaving process of the convex three-dimensional braided preform is realized based on the independent control three-dimensional braiding technology and is completed on a three-dimensional braiding machine. The three-dimensional braiding machine includes a yarn carrier and a braiding station 6, the yarn carrier is movably arranged around the braiding station 6, and the braiding station 6 rotates around its axis while driving the yarn carrier to rotate around the braiding station 6, so that the yarn carrier changes position, and each braiding station 6 is driven by an independent control motor.

[0070] like Figures 1 to 11 As shown, the circles numbered 1 to 36 in the figure are used to represent yarn carriers.

[0071] In this embodiment, a plurality of yarn carriers are arranged into a weaving matrix, the weaving matrix includes a first weaving matrix and a second weaving matrix, the first weaving matrix corresponds to the protruding portion 82, the second weaving matrix corresponds to the main portion 81, the first weaving matrix includes M1 rows and N1 columns of yarn carriers, the second weaving matrix includes M2 rows and N2 columns of yarn carriers, wherein N2 is greater than N1. Figure 3 As shown, in some specific embodiments, the yarn carriers numbered "2 to 12" are arranged to form a first weaving matrix, and the yarn carriers numbered "13 to 19, and 21 to 34" are arranged to form a second weaving matrix.

[0072] The yarn carriers of the first weaving matrix and the second weaving matrix are aligned in columns, and the protruding yarn carrier 32 at the end of the column of the first weaving matrix and the protruding yarn carrier 41 at the beginning of the column of the second weaving matrix are located in the same row; weaving is carried out according to the three-dimensional four-step method to form a convex three-dimensional weaving preform.

[0073] Specifically, the relative positions of the first weaving matrix and the second weaving matrix are determined according to the cross-sectional shape of the convex three-dimensional weaving preform, and the direction "from the first weaving matrix to the second weaving matrix" is defined as the column direction of the yarn carrier, and the direction perpendicular to the column direction of the yarn carrier is defined as the row direction of the yarn carrier. The end of the first weaving matrix away from the second weaving matrix is ​​defined as the head of the column, and the end of the second weaving matrix away from the second weaving matrix is ​​defined as the tail of the column. In the row direction, one end of the yarn carrier is defined as the head of the row, and the other end is defined as the tail of the row.

[0074] The spacing between two adjacent rows of yarn carriers in the first weaving matrix is ​​equal to the spacing between two adjacent rows of yarn carriers in the second weaving matrix.

[0075] like Figures 3 to 11 As shown, in this embodiment, the first weaving matrix and the second weaving matrix are provided with columns of protruding yarn carriers, and the yarn carriers of each column are aligned one by one in the column direction.

[0076] Specifically, when the first column protruding yarn carrier 31 of the first weaving matrix and the first column protruding yarn carrier 41 of the second weaving matrix are respectively arranged in the odd columns of the first weaving matrix and the second weaving matrix, or when the first column protruding yarn carrier 31 of the first weaving matrix and the first column protruding yarn carrier 41 of the second weaving matrix are respectively arranged in the even columns of the first weaving matrix and the second weaving matrix, the odd columns of the first weaving matrix are aligned with some odd columns of the second weaving matrix, and the even columns of the first weaving matrix are aligned with some even columns of the second weaving matrix.

[0077] When the protruding yarn carrier 31 at the head of the first weaving matrix is ​​set in the odd columns of the first weaving matrix and the protruding yarn carrier 41 at the head of the second weaving matrix is ​​set in the even columns of the second weaving matrix, or when the protruding yarn carrier 31 at the head of the first weaving matrix is ​​set in the even columns of the first weaving matrix and the protruding yarn carrier 41 at the head of the second weaving matrix is ​​set in the odd columns of the second weaving matrix, the odd columns of the first weaving matrix are aligned with some of the even columns of the second weaving matrix, and the even columns of the first weaving matrix are aligned with some of the even columns of the second weaving matrix.

[0078] In this embodiment, the protruding yarn carrier 32 at the end of the first weaving matrix and the protruding yarn carrier 41 at the beginning of the second weaving matrix are located in the same row, forming a connecting row yarn carrier 5, and the protruding yarn carrier 32 at the end of the first weaving matrix and the protruding yarn carrier 41 at the beginning of the corresponding second weaving matrix are aligned in the row and staggered. Therefore, in the process of three-dimensional weaving of the yarn by moving the yarn carrier according to the three-dimensional four-step method, the yarn of the raised part 82 and the main part 81 will be entangled at the junction of the two, and the raised part 82 and the main part 81 are connected as one, realizing the one-piece weaving of the convex three-dimensional weaving preform, so that the composite material convex product is preformed before impregnation, which can not only ensure the connection stability between the raised part 82 and the main part 81, but also avoid cutting and other processing procedures, and can ensure the integrity of the weaving structure, and reduce the use of connecting parts, improve the overall performance of the composite material convex product, and provide great protection for the safety of the composite material convex product.

[0079] In this embodiment, when weaving according to the three-dimensional four-step method, the first weaving matrix and the second weaving matrix are respectively shifted in rows and synchronously shifted in columns, so that the main part 81 of the convex three-dimensional woven preform is connected with the convex part 82 for weaving.

[0080] In this embodiment, "the first weaving matrix and the second weaving matrix perform row shifts respectively and column shifts synchronously" specifically means that when the weaving matrix is ​​performing row shifts, the connecting row yarn carrier 5 does not perform row shifts, and after the yarn carriers on both sides of the connecting row yarn carrier 5 complete the row shifts, the weaving matrix as a whole performs column shifts, and during this process, the yarn carriers of each column aligned with each other in the column direction in the first weaving matrix and the second weaving matrix perform column shifts in the same direction.

[0081] In the process of "the first weaving matrix and the second weaving matrix are shifted in rows respectively", the protruding yarn carrier 31 at the head of the first weaving matrix, the protruding yarn carrier at the tail of the first weaving matrix, the protruding yarn carrier 41 at the head of the second weaving matrix, and the protruding yarn carrier 42 at the tail of the second weaving matrix do not participate in the row shift. In the process of "the first weaving matrix and the second weaving matrix are shifted in columns synchronously", the protruding yarn carrier 33 at the head of the first weaving matrix, the protruding yarn carrier 34 at the tail of the first weaving matrix, the protruding yarn carrier 43 at the head of the second weaving matrix, and the protruding yarn carrier 44 at the tail of the second weaving matrix do not participate in the column shift.

[0082] like Figures 4 to 11 As shown, in some specific embodiments, the three-dimensional four-step method includes:

[0083] In the first step, the first weaving matrix and the second weaving matrix are respectively shifted in rows, and the yarn carriers of adjacent rows are alternately moved one position in the row direction;

[0084] In the second step, the first weaving matrix and the second weaving matrix are synchronously shifted in columns, and the yarn carriers of adjacent columns are alternately moved one position in the column direction;

[0085] In the third step, the first weaving matrix and the second weaving matrix are shifted respectively, and the shifting direction is opposite to that in the first step;

[0086] In the fourth step, the first weaving matrix and the second weaving matrix are synchronously shifted in columns, and the direction of the column shifting is opposite to that in the second step.

[0087] In some possible embodiments, when executing the three-dimensional four-step method, column shifting may be performed in the first step and the third step, and row shifting may be performed in the second step and the fourth step.

[0088] Preferably, in this embodiment, a row of yarn carriers adjacent to the connecting row of yarn carriers 5 in the first weaving matrix and a row of yarn carriers adjacent to the connecting row of yarn carriers 5 in the second weaving matrix have the same moving direction.

[0089] Specifically, when M1 is an odd number, the first-row protruding yarn carrier 33 of the first weaving matrix and the first-row protruding yarn carrier 43 of the second weaving matrix are respectively arranged in the odd rows or even rows of the first weaving matrix and the second weaving matrix; that is, if the first-row protruding yarn carrier 33 of the first weaving matrix is ​​arranged in the odd rows of the second weaving matrix, then the first-row protruding yarn carrier 43 of the second weaving matrix is ​​arranged in the odd rows of the second weaving matrix; if the first-row protruding yarn carrier 33 of the first weaving matrix is ​​arranged in the even rows of the second weaving matrix, then the first-row protruding yarn carrier 43 of the second weaving matrix is ​​arranged in the even rows of the second weaving matrix.

[0090] When M1 is an even number, if the protruding yarn carrier 33 at the beginning of the row of the first weaving matrix is ​​set at the odd rows of the second weaving matrix, then the protruding yarn carrier 43 at the beginning of the row of the second weaving matrix is ​​set at the even rows of the second weaving matrix; if the protruding yarn carrier 33 at the beginning of the row of the first weaving matrix is ​​set at the even rows of the second weaving matrix, then the protruding yarn carrier 43 at the beginning of the row of the second weaving matrix is ​​set at the odd rows of the second weaving matrix.

[0091] Through the above arrangement, the movement directions of a row of yarn carriers adjacent to the connecting row of yarn carriers 5 in the first weaving matrix and a row of yarn carriers adjacent to the connecting row of yarn carriers 5 in the second weaving matrix can be the same.

[0092] By setting a row of yarn carriers adjacent to the connecting row yarn carrier 5 in the first weaving matrix and a row of yarn carriers adjacent to the connecting row yarn carrier 5 in the second weaving matrix to have the same movement direction, the winding effect of the yarn of the raised part 82 and the main part 81 at the junction of the two can be ensured, and subsequent control is facilitated.

[0093] like Figures 1 to 11As shown, in some specific embodiments, the weaving process of the convex three-dimensional braided preform includes the following steps:

[0094] S1: The yarn carriers are in a flatbed arrangement state: the first yarn carriers 1 in the (M1+1)th row and the (N1+1)th column, and the second yarn carriers 2 in the (M2+1)th row and the (N2+1)th column are arranged in a one-to-one correspondence;

[0095] S2: threading: passing the yarn through the yarn carrier and introducing it into the weaving area;

[0096] S3: staggered: forming a weaving matrix;

[0097] S4: Weaving according to the three-dimensional four-step method.

[0098] In this embodiment, before arranging the first yarn carrier 1 and the second yarn carrier 2, the required number of rows and columns of the first yarn carrier 1 and the second yarn carrier 2 are calculated according to the cross-sectional shape of the convex three-dimensional braiding preform.

[0099] like Figures 1 to 3 As shown, the first yarn carriers 1 of the (M1+1) row and (N1+1) column are arranged one by one in the row and column directions, and are adapted to the cross-sectional shape of the raised portion 82, and the second yarn carriers 2 of the (M2+1) row and (N2+1) column are arranged one by one in the row and column directions, and are adapted to the cross-sectional shape of the main portion 81. This state is the flat car arrangement state, which can facilitate the operator to go online and ensure accuracy. Figure 1 As shown, in some specific embodiments, the yarn carriers numbered “1 to 12” are the first yarn carriers 1 , and the yarn carriers numbered “13 to 36” are the second yarn carriers 2 .

[0100] Preferably, Figure 3 As shown, in this embodiment, after the misalignment, the (M1+1)-row (N1+1)-column first yarn carriers 1 form a first weaving matrix having M1-row N1-column yarn carriers, and the (M2+1)-row (N2+1)-column second yarn carriers 2 form a first weaving matrix having M2-row N2-column yarn carriers. That is, the (M1+1)-row (N1+1)-column first yarn carriers 1 in the flat car arrangement state are for forming a first weaving matrix having M1-row N1-column yarn carriers after the misalignment, and the (M2+1)-row (N2+1)-column second yarn carriers 2 in the flat car arrangement state are for forming a first weaving matrix having M2-row N2-column yarn carriers after the misalignment. Specifically, the flat car arrangement state is for enabling operators to go online conveniently and accurately, and the misalignment is for forming a weaving matrix to prepare for the start of three-dimensional weaving.

[0101] In this embodiment, the staggered cars include horizontal cars and vertical cars. The horizontal cars are used to form the protruding yarn carriers 43 at the beginning of the rows and the protruding yarn carriers at the end of the rows of the first weaving matrix and the second weaving matrix, and the vertical cars are used to form the protruding yarn carriers 41 at the beginning of the columns and the protruding yarn carriers at the end of the columns of the first weaving matrix and the second weaving matrix.

[0102] In some specific embodiments, the transverse vehicle specifically arranges the rows of the first yarn carriers 1 and the second yarn carriers 2 uniformly along the column direction, and moves the first yarn carriers 1 and the second yarn carriers 2 with odd or even serial numbers in the same direction by one position.

[0103] Specifically, the vertical machine forms N2 rows of second yarn carriers 2 after the horizontal machine, and the odd or even rows of the second yarn carriers 2 are shifted one position in the same direction, and the first yarn carriers 1 in the same row as the second yarn carriers 2 that are shifted are shifted one position in the same direction to form a weaving matrix.

[0104] The layout of the weaving station 6 is adapted to the movement of the first yarn carrier 1 and the second yarn carrier 2 when the yarn carriers are misaligned, and the movement of the yarn carriers in the first weaving matrix and the second weaving matrix during the three-dimensional weaving process.

[0105] In this embodiment, a first auxiliary yarn carrier 11 is provided in the first yarn carrier 1 in the (M1+1) row and (N1+1) column, and a second auxiliary yarn carrier 21 is provided in the second yarn carrier 2 in the (M2+1) row and (N2+1) column. The first auxiliary yarn carrier 11 and the second auxiliary yarn carrier 21 are provided to facilitate operators to go online when the flat car is arranged. During the three-dimensional weaving process, the first auxiliary yarn carrier 11 and the second auxiliary yarn carrier 21 do not move rows or columns.

[0106] like Figures 1 to 3 As shown, in some specific embodiments, each row of first yarn carriers 1 and each row of second yarn carriers 2 are sorted along the direction from the first yarn carrier 1 to the second yarn carrier 2 and counted as first serial numbers. The first serial number of the row of first yarn carriers 1 farthest from the second yarn carrier 2 is "1", and the first serial number of the row of second yarn carriers 2 closest to the first yarn carrier 1 is "M1+2".

[0107] like Figure 1 As shown, in some specific embodiments, the first serial number of the first yarn carriers 1 numbered from "1 to 4" is "1", and the first serial number of the second yarn carriers 2 numbered from "13 to 20" is "M1+2". "M1" is equal to 3.

[0108] In this embodiment, "the direction from the first column to the last column" is defined as the first direction 7, and the transverse car is used to move the first yarn carrier 1 and the second yarn carrier 2 with an even first serial number toward the first direction 7 by one position, so that the head of the row of the first yarn carrier 1 with an odd first serial number forms the protruding yarn carrier 33 at the head of the row of the first weaving matrix, the head of the row of the second yarn carrier 2 with an odd first serial number forms the protruding yarn carrier 43 at the head of the row of the second weaving matrix, the end of the row of the first yarn carrier 1 with an even first serial number forms the protruding yarn carrier 34 at the end of the row of the first weaving matrix, and the end of the row of the second yarn carrier 2 with an even first serial number forms the protruding yarn carrier 44 at the end of the row of the second weaving matrix. The arrangement state of the yarn carriers after the transverse car is as shown in the figure. Figure 2 shown.

[0109] Then, the N1 columns of second yarn carriers 2 in the horizontal arrangement state are sorted along the first direction 7 and counted as the second serial number. In this process, the "columns" where "the protruding yarn carrier 43 at the beginning of the row of the second weaving matrix" and "the protruding yarn carrier 44 at the end of the row of the second weaving matrix" are located are not counted in the sorting. During the vertical car, the second yarn carrier 2 with an even second serial number is shifted one position in the direction away from the first yarn carrier 1. At the same time, the first yarn carrier 1 in the same column as the second yarn carrier 2 that is shifted is shifted one position in the same direction to form a weaving matrix. During the vertical car process, the tail of the first yarn carrier 1 participating in the column shift forms the protruding yarn carrier 32 at the end of the column of the first weaving matrix, the head of the first yarn carrier 1 not participating in the column shift forms the protruding yarn carrier 31 at the beginning of the column of the first weaving matrix, the tail of the second yarn carrier 2 participating in the column shift forms the protruding yarn carrier 42 at the end of the column of the second weaving matrix, and the head of the second yarn carrier 2 not participating in the column shift forms the protruding yarn carrier 41 at the beginning of the column of the second weaving matrix.

[0110] During the vertical lathe process, "the protruding yarn carrier 33 at the beginning of the row of the first weaving matrix", "the protruding yarn carrier 43 at the beginning of the row of the second weaving matrix", "the protruding yarn carrier 34 at the end of the row of the first weaving matrix", and "the protruding yarn carrier 44 at the end of the row of the second weaving matrix" are not shifted. Figure 3 shown.

[0111] During the process of passing the carriages, if the first yarn carrier 1 and the second yarn carrier 2 whose first serial number is an even number move in the first direction 7, and the second yarn carrier 2 whose second serial number is an even number moves in the direction away from the first yarn carrier 1, then, in the flat car arrangement state, the first yarn carrier 1 located at the head of the first row is the first auxiliary yarn carrier 11; in this process, if (M1+2) is an even number, then, in the flat car arrangement state, the second yarn carrier 2 located at the end of the first row is the second auxiliary yarn carrier 21, and if (M1+2) is an odd number, then, in the flat car arrangement state, the second yarn carrier 2 located at the head of the first row is the second auxiliary yarn carrier 21.

[0112] During the process of passing the carriages, if the first yarn carrier 1 and the second yarn carrier 2 whose first serial number is an odd number move in the first direction 7, and the second yarn carrier 2 whose second serial number is an even number moves in the direction away from the first yarn carrier 1, then, in the flat car arrangement state, the first yarn carrier 1 located at the end of the first row is the first auxiliary yarn carrier 11; in this process, if (M1+2) is an even number, then, in the flat car arrangement state, the second yarn carrier 2 located at the beginning of the first row is the second auxiliary yarn carrier 21, and if (M1+2) is an odd number, then, in the flat car arrangement state, the second yarn carrier 2 located at the end of the first row is the second auxiliary yarn carrier 21.

[0113] Specifically, Figures 1 to 3 As shown, in this embodiment, "M1" and "M2" are odd numbers, and "N1" and "N2" are even numbers. In the process of staggering, the first yarn carrier 1 and the second yarn carrier 2 with the even number of the first sequence number are moved in the first direction 7, and the second yarn carrier 2 with the even number of the second sequence number is moved in the direction away from the first yarn carrier 1. In the flat car arrangement state, the first yarn carrier 1 at the head of the first row is the first auxiliary yarn carrier 11, and the second yarn carrier 2 at the end of the first row is the second auxiliary yarn carrier 21.

[0114] like Figure 3 As shown, in this embodiment, the yarn carrier numbered "1" is the first auxiliary yarn carrier 11, and the yarn carrier numbered "20" is the second auxiliary yarn carrier 21. Figures 4 to 11 As shown, in this embodiment, the first auxiliary yarn carrier 11 and the second auxiliary yarn carrier 21 do not participate in row shifting and column shifting in the subsequent three-position weaving process, but are only for the convenience of threading.

[0115] like Figure 1 As shown, in the present embodiment, in the flat car state, a row of weaving stations 6 is respectively arranged between two adjacent rows of first yarn carriers 1, between the first yarn carrier 1 and the second yarn carrier 2, between two adjacent rows of second yarn carriers 2, and on the side of the second yarn carrier 2 away from the first yarn carrier 1, and the number of weaving stations 6 arranged between two adjacent rows of first yarn carriers 1 is at least "N1 / 2", and when "N1" is an odd number, the number of weaving stations 6 arranged between two adjacent rows of first yarn carriers 1 is at least "(N1+1) / 2"; the number of weaving stations 6 between the first yarn carrier 1 and the second yarn carrier 2, between two adjacent rows of second yarn carriers 2, and on the side of the second yarn carrier 2 away from the first yarn carrier 1 is at least "N2 / 2", and when "N2" is an odd number, the number of weaving stations 6 arranged between two adjacent rows of first yarn carriers 1 is at least "(N2+1) / 2".

[0116] In this embodiment, the structure of the weaving station 6 and the layout between the weaving station 6 and the yarn carrier are the same as the structure of the weaving station 6 and the layout between the weaving station 6 and the yarn storage device disclosed in the operation method of a three-dimensional automatic weaving device disclosed in the invention patent with application number CN201811430626.0, and will not be repeated here.

[0117] Preferably, in this embodiment, the weaving station 6 drives a yarn carrier to rotate 90° at a time. Figures 4 to 11 In the example shown, the weaving station 6 drives the yarn carrier to move obliquely by 45 degrees by rotating, so that the yarn carrier moves in rows and columns.

[0118] like Fig.12 As shown, in some possible embodiments, a protruding portion 82 is provided on the main body portion 81 , and a first weaving matrix is ​​provided corresponding to the protruding portion 82 .

[0119] like Fig.13 As shown, in some other possible embodiments, a plurality of raised portions 82 arranged at intervals are provided on the main body portion 81 . In this embodiment, the first weaving matrix is ​​provided with a plurality of raised portions 82 corresponding one to one.

[0120] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above in the preferred embodiment, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A weaving process for a convex three-dimensional weaving preform, characterized in that: The convex three-dimensional braided preform comprises a main body part (81) and a convex part (82); a plurality of yarn carriers are arranged into a braiding matrix, and the braiding matrix comprises: A first weaving matrix, corresponding to the raised portion (82), includes N1 rows of yarn carriers; A second weaving matrix, corresponding to the main body (81), includes N2 rows of yarn carriers, N2 being greater than N1; The yarn carriers of the first weaving matrix and the second weaving matrix are aligned in columns, and the protruding yarn carrier (32) at the end of the column of the first weaving matrix and the protruding yarn carrier (41) at the beginning of the column of the second weaving matrix are located in the same row; The three-dimensional four-step weaving method is used to form a convex three-dimensional woven preform.

2. The weaving process of the convex three-dimensional braided preform according to claim 1, characterized in that: When weaving according to the three-dimensional four-step method, the first weaving matrix and the second weaving matrix are respectively shifted in rows and synchronously shifted in columns, so that the main part (81) and the raised part (82) of the convex three-dimensional weaving preform are connected and woven.

3. The weaving process of the convex three-dimensional weaving preform according to claim 2, characterized in that: The protruding yarn carrier (32) at the end of the first weaving matrix and the protruding yarn carrier (41) at the beginning of the second weaving matrix are located in the same row, forming a connecting row yarn carrier (5); The movement direction of a row of yarn carriers adjacent to the connecting row of yarn carriers (5) in the first weaving matrix and a row of yarn carriers adjacent to the connecting row of yarn carriers (5) in the second weaving matrix are the same; Preferably, the first weaving matrix and the second weaving matrix are provided with columns of protruding yarn carriers, and the yarn carriers of each column are aligned one by one in the column direction; Preferably, the protruding yarn carriers (32) at the end of the first weaving matrix and the protruding yarn carriers (41) at the beginning of the corresponding second weaving matrix are aligned in the row direction and arranged alternately.

4. The weaving process of the convex three-dimensional weaving preform according to claim 3, characterized in that: The first weaving matrix includes an M1 row of yarn carriers; When M1 is an odd number: The protruding yarn carrier (33) at the beginning of a row of the first weaving matrix and the protruding yarn carrier (43) at the beginning of a row of the second weaving matrix are respectively arranged in odd-numbered rows or even-numbered rows of the first weaving matrix and the second weaving matrix; When M1 is an even number: If the protruding yarn carrier (33) at the beginning of a row of the first weaving matrix is ​​arranged at the odd-numbered rows of the second weaving matrix, then the protruding yarn carrier (43) at the beginning of a row of the second weaving matrix is ​​arranged at the even-numbered rows of the second weaving matrix; If the first-row protruding yarn carrier (33) of the first weaving matrix is ​​arranged in the even-numbered rows of the second weaving matrix, the first-row protruding yarn carrier (43) of the second weaving matrix is ​​arranged in the odd-numbered rows of the second weaving matrix.

5. The weaving process of the convex three-dimensional weaving preform according to claim 3, characterized in that: The three-dimensional four-step method includes: In the first step, the first weaving matrix and the second weaving matrix are respectively shifted in rows, and the yarn carriers in adjacent rows are alternately shifted by one position along the row direction, and the row of yarn carriers adjacent to the connecting row yarn carrier (5) in the first weaving matrix and the row of yarn carriers adjacent to the connecting row yarn carrier (5) in the second weaving matrix have the same shift direction; In the second step, the first weaving matrix and the second weaving matrix are synchronously shifted in columns, and the yarn carriers of adjacent columns are alternately moved one position in the column direction; In the third step, the first weaving matrix and the second weaving matrix are shifted respectively, and the shifting direction is opposite to that in the first step; In the fourth step, the first weaving matrix and the second weaving matrix are synchronously shifted in columns, and the direction of the column shifting is opposite to that in the second step.

6. The weaving process of the convex three-dimensional weaving preform according to any one of claims 3 to 5, characterized in that: The following steps are involved: S1: The yarn carriers are in a flatbed arrangement state: (M1+1) rows and (N1+1) columns of first yarn carriers (1) and (M2+1) rows and (N2+1) columns of second yarn carriers (2) are arranged in a one-to-one correspondence; S2: threading: passing the yarn through the yarn carrier and introducing it into the weaving area; S3: staggered: forming a weaving matrix; S4: weaving according to the three-dimensional four-step method; Preferably, after the trains are shifted, the (M1+1)-row and (N1+1)-column first yarn carriers (1) form a first weaving matrix having M1-row and N1-column yarn carriers, and the (M2+1)-row and (N2+1)-column second yarn carriers (2) form a first weaving matrix having M2-row and N2-column yarn carriers.

7. The weaving process of the convex three-dimensional weaving preform according to claim 6, characterized in that: Wrong vehicles include: The transverse vehicle uniformly arranges the rows of the first yarn carriers (1) and the second yarn carriers (2) along the column direction, and moves the first yarn carriers (1) and the second yarn carriers (2) with odd or even serial numbers in the same direction by one position; After vertical and horizontal machining, N2 rows of second yarn carriers (2) are formed, and the odd or even rows of the second yarn carriers (2) are shifted in the same direction by one position, and the first yarn carriers (1) in the same row as the second yarn carriers (2) that are shifted in the same direction by one position, thereby forming a weaving matrix.

8. The weaving process of the convex three-dimensional weaving preform according to any one of claims 1 to 5, characterized in that: The main body (81) is provided with a raised portion (82), and the first woven matrix is ​​provided with a corresponding raised portion (82); or, The main body (81) is provided with a plurality of convex portions (82) arranged at intervals, and the first weaving matrix is ​​provided with a plurality of convex portions (82) corresponding one to one.

9. The weaving process of the convex three-dimensional weaving preform according to any one of claims 1 to 5, characterized in that: The yarn carrier is driven by the weaving station (6) to realize rotational movement. The weaving station (6) rotates around its axis and drives the yarn carrier to rotate around the weaving station (6), so that the yarn carrier changes position. Preferably, the weaving station (6) drives a yarn carrier to rotate 90° at a time.

10. A convex three-dimensional braided preform, characterized in that: The convex three-dimensional braided preform is woven using the weaving method of any one of claims 1 to 9.

Images