Method for manufacturing a composite workpiece

Abstract

The application discloses a composite workpiece manufacturing method and belongs to the technical field of composite manufacturing. The composite workpiece manufacturing method is characterized in that: first weaving is performed on the outer sides of at least two weaving core molds to form first woven pieces; the at least two weaving core molds are sequentially connected along a first direction to form a first preform; second weaving is performed on the outer side of the first preform to form a second preform; the side weaving portions of the woven pieces are sequentially cut and the weaving core molds are sequentially removed from the two ends of the second preform to the center of the second preform along the first direction to form two third preforms; the side weaving portion is a part of the woven piece located on one side of the weaving core mold along the first direction; and the third preform is infiltrated with a reinforcing material and solidified by using a forming mold. The composite workpiece manufacturing method not only simplifies the manufacturing process of the composite workpiece, but also is favorable for guaranteeing the forming quality of the composite workpiece, and has the advantages of simple process flow, low solidification cost and high manufacturing efficiency.

Description

Technical Field

[0001] This invention relates to the field of composite material manufacturing technology, and in particular to a method for manufacturing composite material workpieces. Background Technology

[0002] Composite material workpieces often exhibit irregular structural features, resulting in irregularly shaped parts. Directly applying a single sheet of unidirectional fiber tape to these irregularly shaped parts can cause wrinkles. If manufacturing is done by hand-laying unidirectional tape after slitting, fiber angles, fiber gaps, and wrinkles are difficult to control, significantly increasing manufacturing difficulty and time, and compromising quality consistency and stability. Using an automated fiber-layout thermal insulation film preforming process requires multiple preforming bends and preform assembly after automated placement, making the process complex and cumbersome. Furthermore, wrinkles and other defects are prone to occur during preforming bending, and automated fiber placement is limited by the curvature of the part, resulting in poor placement for parts with large curvatures. Summary of the Invention

[0003] The purpose of this invention is to provide a method for manufacturing composite material workpieces to solve the above-mentioned problems.

[0004] To achieve the above objectives, the following technical solution is provided:

[0005] A method for manufacturing composite material workpieces includes the following steps:

[0006] A first braided piece is formed on the outside of at least two braided core molds by weaving, and the first braided piece is sleeved on the outside of the braided core mold;

[0007] At least two of the braided core molds are connected sequentially along a first direction to form a first preform;

[0008] A second preform is made by weaving a second woven piece on the outside of the first preform and then fitting the second woven piece onto the outside of the first preform.

[0009] Along the first direction from both ends of the second preform towards the center of the second preform, the side braided portion of the braided piece is cut and the braided core mold is removed in sequence to produce two third preforms; the side braided portion is the part of the braided piece located on one side of the braided core mold along the first direction;

[0010] The third preform is impregnated with reinforcing material and cured using a molding die.

[0011] As a preferred technical solution of the above-mentioned composite material workpiece manufacturing method, before weaving on the outside of the first preform to form the second woven part, the method further includes: setting a connector at the connection of two adjacent woven core molds, and making the first woven part on the two adjacent woven core molds contact the connector.

[0012] As a preferred technical solution of the above-mentioned composite material workpiece manufacturing method, the first braided part includes a first braided portion and a second braided portion. The first braided portion is located on one side of the braided core mold along the first direction, and the first braided portion and the second braided portion are respectively located on two adjacent sides of the braided core mold.

[0013] After at least two of the braided core molds are sequentially connected along a first direction, the first braided portions of two adjacent braided core molds abut against each other, and a gap is provided between the plane containing the surface of the second braided portion facing away from the braided core mold and the first braided component on the two adjacent braided core molds, and the connecting member fills the gap; or

[0014] After at least two braided core molds are connected sequentially along a first direction, the first braided portions of two adjacent braided core molds are spaced apart, and a gap is provided between the plane of the surface of the second braided portion on the side away from the braided core mold and the first braided component on the two adjacent braided core molds, and the connector fills the gap.

[0015] As a preferred technical solution of the above-mentioned composite material workpiece manufacturing method, the connecting member is made of the same material as the first braided part; and / or,

[0016] The connector is made of the same material as the first braided component; and / or,

[0017] The first braided component and the second braided component are made of the same material.

[0018] As a preferred technical solution of the above-mentioned composite material workpiece manufacturing method, the side braided portion is cut and the braided core mold is removed sequentially from both ends of the second preform towards the center of the second preform along the first direction to produce two third preforms, including the following steps:

[0019] The side braided portions located at both ends of the second preform along the first direction are cut;

[0020] The side knitted portion after folding and cutting;

[0021] The woven part is pre-shaped;

[0022] Along the first direction from both ends of the second preform towards the center of the second preform, the remaining side braided portions are cut and the braided core mold is removed in sequence to produce two third preforms.

[0023] As a preferred technical solution of the above-mentioned composite material workpiece manufacturing method, before the side braided part after folding and cutting, the method further includes: setting two side molds on both sides of the second preform along the second direction; the second direction is perpendicular to the first direction;

[0024] When folding the cut side knitted portion, the side knitted portion located on the same side as the side mold at the cut is folded until it fits against the side mold.

[0025] As a preferred technical solution of the above-mentioned composite material workpiece manufacturing method, after the first preform is made, the first woven part is pre-shaped; and / or,

[0026] After the second preform is made, the second braid or the second braid and the first braid are pre-shaped.

[0027] As a preferred technical solution of the above-mentioned composite material workpiece manufacturing method, after the third preform is manufactured, the method further includes: trimming the shape of the third preform; and / or,

[0028] After the third preform is impregnated with reinforcing material and cured, the process further includes:

[0029] Demolding to produce a molded part;

[0030] Adjust the shape of the molded part.

[0031] As a preferred technical solution of the above-mentioned composite material workpiece manufacturing method, the braided core mold includes at least two detachably connected mold parts;

[0032] When removing the braided core mold, at least two of the molds are disassembled separately.

[0033] As a preferred embodiment of the above-mentioned method for manufacturing composite material workpieces, the first braided component includes at least one braided layer; and / or,

[0034] The second braided component includes at least one braided layer.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] The method for manufacturing composite material workpieces of the present invention involves forming a first braided part on the outside of at least two braided mandrels by weaving, with the first braided part fitted onto the outside of the braided mandrels; sequentially connecting the at least two braided mandrels along a first direction to form a first preform; forming a second braided part on the outside of the first preform by weaving, with the second braided part fitted onto the outside of the first preform to form a second preform; sequentially cutting and removing the braided mandrels from both ends of the second preform towards the center of the second preform along the first direction to form two third preforms; the side braided part is the portion of the braided part located on one side of the braided mandrel along the first direction; and using a molding die to impregnate and cure the third preforms with reinforcing material. This method not only simplifies the manufacturing process of composite material workpieces but also helps to ensure the molding quality of composite material workpieces. Furthermore, it has the advantages of simple process flow, low curing cost, and high manufacturing efficiency. Attached Figure Description

[0037] Figure 1 This is a flowchart of the composite material workpiece manufacturing method in an embodiment of the present invention;

[0038] Figure 2 This is a structural diagram of the first composite material workpiece in an embodiment of the present invention;

[0039] Figure 3 This is a structural diagram of the second type of composite material workpiece in an embodiment of the present invention;

[0040] Figure 4 This is a detailed flowchart of the composite material workpiece manufacturing method in an embodiment of the present invention;

[0041] Figures 5 to 12 This is a state diagram of the composite material workpiece manufacturing process in an embodiment of the present invention;

[0042] Figure 13 This is a schematic diagram of the molding die in an embodiment of the present invention.

[0043] Figure label:

[0044] 1a. Main body; 1b. Flanged edge; 1c. Vertical rib; 11. First braided component; 12. Second braided component; 13. Connector; 15. Outer braided section; 16. Inner braided section;

[0045] 21. Woven core mold; 22. Side mold; 23. Molding mold; 231. Bottom mold; 232. Upper mold; 233. Fixed core mold; 234. Movable core mold. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0048] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0049] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0050] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0053] like Figures 1 to 13 As shown, this embodiment provides a method for manufacturing composite material workpieces, including the following steps:

[0054] S1. A first braided piece 11 is formed on the outside of at least two braided core molds 21 by weaving, and the first braided piece 11 is fitted on the outside of the braided core mold 21.

[0055] S2. Connect at least two braided core molds 21 sequentially along the first direction to form a first preform.

[0056] S3. A second braided component 12 is formed on the outside of the first preform by weaving. The second braided component 12 is fitted onto the outside of the first preform to form a second preform.

[0057] S4. Along the first direction from both ends of the second preform to the center of the second preform, the side braiding portion of the braid is cut and the braiding core mold 21 is removed in sequence to make two third preforms; the side braiding portion is the part of the braid located on one side of the braiding core mold 21 along the first direction.

[0058] S5. Using molding die 23, the third preform is impregnated with reinforcing material and cured.

[0059] For example, the reinforcing material is epoxy resin, unsaturated polyester resin, or vinyl ester resin. Of course, other resins in the prior art can also be used as reinforcing materials, and this is not limited thereto.

[0060] The composite material workpiece manufacturing method of this embodiment only requires weaving operations on the outer side of the braided mandrel 21 and the outer side of the first preform. This not only reduces the weaving difficulty but also simplifies the combination and connection operations of the first braided part 11 and the second braided part 12. Furthermore, compared to existing technologies, it reduces the number of cutting and flipping operations. Since the braided mandrel 21 provides constant support during weaving and cutting, it better prevents fiber loosening, deformation, and twisting, improving the molding quality of the braided part and thus ensuring the molding quality of the composite material workpiece.

[0061] The composite material workpiece manufacturing method of this embodiment provides support for weaving and cutting operations through the braiding core mold 21, and impregnates the braided part with reinforcing material and cures it through the molding mold 23. This not only improves product quality and consistency, but also simplifies the process, reduces curing costs, and increases manufacturing efficiency.

[0062] Optionally, before weaving the outer side of the first preform to form the second woven piece 12, the method further includes: providing a connector 13 at the connection between two adjacent woven core molds 21, and ensuring that the first woven pieces 11 on both adjacent woven core molds 21 are in contact with the connector 13. This arrangement allows the connector 13 to support the two adjacent first woven pieces 11, thereby improving the strength and flatness of the connection between the first woven pieces 11 on the two adjacent woven core molds 21.

[0063] Optionally, the first braided component 11 includes a first braided portion and a second braided portion. The first braided portion is located on one side of the braided core mold 21 along the first direction, and the first braided portion and the second braided portion are respectively located on adjacent sides of the braided core mold 21. Further, after at least two braided core molds 21 are connected sequentially along the first direction, the first braided portions of two adjacent braided core molds 21 abut against each other, and a gap is provided between the plane of the surface of the second braided portion facing away from the braided core mold 21 and the first braided component 11 on the two adjacent braided core molds 21, and the connecting member 13 fills the gap.

[0064] It is understandable that when at least two braided core molds 21 are connected sequentially along the first direction, and the first braided portions of two adjacent braided core molds 21 abut against each other, a gap will exist between the plane containing the surface of the second braided portion on the side away from the braided core mold 21 and the first braided piece 11 on the two adjacent braided core molds 21. This gap can easily lead to deformation such as collapse of the first braided piece 11 and the second braided piece 12. Filling the gap with the connector 13 and supporting the first braided piece 11 and the second braided piece 12 through the connector 13 helps to improve the flatness of the composite material workpiece surface.

[0065] Of course, in other embodiments, after at least two braided core molds 21 are connected sequentially along the first direction, the first braided portions of two adjacent braided core molds 21 are spaced apart, and there is a gap between the plane of the surface of the second braided portion on the side away from the braided core mold 21 and the first braided piece 11 on the two adjacent braided core molds 21, and the connector 13 fills the gap.

[0066] Optionally, the first braided component 11 and the second braided component 12 are made of the same material, which helps to better bond the first braided component 11 and the second braided component 12 together, improves the connection stability of the first braided component 11 and the second braided component 12, and enhances the flatness of the composite material workpiece surface. It also simplifies the operation process and improves production efficiency.

[0067] For example, the first braid 11 is made of glass fiber, carbon fiber or aramid fiber; the second braid 12 is made of glass fiber, carbon fiber or aramid fiber. Of course, the first braid 11 and the second braid 12 can also be made of other fibers in the prior art, which are not limited here.

[0068] Optionally, the connector 13 and the first braid 11 are made of the same material, which helps to make the connector 13 and the first braid 11 fit together better, improves the connection stability between the connector 13 and the first braid 11 and the flatness of the surface of the composite material workpiece.

[0069] Optionally, the connector 13 is made of the same material as the first braid 11, which helps the connector 13 and the second braid 12 to fit together better, thereby improving the connection stability between the connector 13 and the second braid 12 and the flatness of the surface of the composite material workpiece.

[0070] For example, the connector 13 is a strip structure woven from yarn. Of course, the connector 13 can also be a rope structure made from yarn. When the connector 13 is placed at the junction of two adjacent braided core molds 21, the connector 13 can be deformed by squeezing it, thereby better filling the gaps.

[0071] Optionally, step S4 includes the following steps:

[0072] S41. Cut the side braided portions located at both ends of the second preform along the first direction;

[0073] S42, the side knitted section after folding and cutting;

[0074] S43. Pre-shape the woven parts;

[0075] S44. Along the first direction from both ends of the second preform to the center of the second preform, the remaining side braided portions are cut and the braided core mold 21 is removed in sequence to produce two third preforms.

[0076] When it is necessary to manufacture a third preform with a flange 1b, the side braided portions at both ends of the second preform along the first direction can be cut first, and the cut side braided portions can be folded over to form the flange 1b. At the same time, the flange 1b makes it easier to remove the braided core mold 21 at both ends of the second preform along the first direction.

[0077] After the side braided portion is folded and cut to form the flange 1b, the braided part is pre-shaped to prevent the flange 1b from deforming. At the same time, it facilitates the subsequent cutting operation of the remaining side braided portions, and after removing the braided core mold 21, it helps to prevent the third preform from deforming and other problems, thereby improving the molding quality of the composite material workpiece.

[0078] It should be noted that when three or more braided core molds 21 are used in the manufacturing process of composite material workpieces, after the braided part is pre-shaped in step S43, there may be operational inconvenience when the braided core mold 21 located in the middle needs to be removed in step S44.

[0079] To address the aforementioned issues, the braided core mold 21 comprises at least two detachably connected mold parts; when dismantling the braided core mold 21, at least two mold parts are disassembled, thereby reducing the difficulty of dismantling the braided core mold 21 in step S44 and improving production efficiency.

[0080] For example, at least two mold segments are arranged end to end around the axial direction of the braiding core mold 21, so that any part of the first braid 11 is supported by the braiding core mold 21. Adjacent mold segments are connected by locking devices such as fixing clips. When disassembly is required, the fixing clips can be removed to disassemble the braiding core mold 21 into at least two mold segments.

[0081] Optionally, before step S42, the method further includes: placing two side molds 22 on both sides of the second preform along a second direction; the second direction is perpendicular to the first direction. Further, when folding the cut side braided portion, the side braided portion located on the same side of the cut as the side mold 22 is folded until it fits snugly against the side mold 22. This arrangement allows the side molds 22 to support the flange 1b, improving the molding quality of the composite material workpiece.

[0082] Of course, if the third preform does not require the flange 1b, the side mold 22 can be omitted.

[0083] Optionally, after the first preform is made, the first braided part 11 is pre-shaped, which helps to avoid problems such as deformation of the first braided part 11 in subsequent steps and improves the molding quality of the composite material workpiece.

[0084] For example, a plastic bag is placed over the outside of the first preform, and the plastic bag is vacuum-sealed. The first preform with the plastic bag is then heated in an oven to pre-shape the first woven piece 11.

[0085] Optionally, after the second preform is made, the second braided part 12 and the first braided part 11 are pre-shaped, which helps to avoid problems such as deformation of the first braided part 11 and the second braided part 12 in subsequent steps and improves the molding quality of the composite material workpiece.

[0086] For example, a plastic bag is placed over the outside of the second preform, and the plastic bag is vacuumed. The second preform with the plastic bag is then heated in an oven to pre-shape the second woven piece 12 and the first woven piece 11.

[0087] Of course, the first braided part 11 can be pre-shaped after the first preform is made; and the second braided part 12 can be pre-shaped only after the second preform is made.

[0088] For example, during the process of weaving the first knitted piece 11, a setting agent is applied to the first knitted piece 11, and after the first preform is made, the first knitted piece 11 is heated by a heating element such as an iron to set the shape of the first knitted piece 11.

[0089] Furthermore, during the process of weaving the second braided piece 12, a setting agent is applied to the second braided piece 12, and after the second preform is made, the second braided piece 12 is heated by a heating element such as an iron to set the shape.

[0090] Optionally, after the third preform is made, the method further includes: reshaping the shape of the third preform. That is, before impregnating the third preform with the reinforcing material, the shape of the third preform can be reshaped, such as by folding or cutting certain parts of the third preform, so that the third preform is closer to the shape of the composite material workpiece, which is beneficial to improving the molding quality of the composite material workpiece.

[0091] Optionally, after impregnating and curing the third preform with reinforcing material, the process further includes:

[0092] Demolding to produce a molded part;

[0093] Trim the shape of the molded part.

[0094] After the molded parts are made, holes, grooves and other structures can be cut and processed to make composite material workpieces of different shapes; the quality of the molded parts can also be further improved by grinding.

[0095] Optionally, the first braided component 11 includes at least one braided layer. It should be noted that the number of braided layers in the first braided component 11 can be set according to specific needs and is not limited here.

[0096] Optionally, the second braided component 12 includes at least one braided layer. It should be noted that the number of braided layers in the second braided component 12 can be set according to specific needs and is not limited here.

[0097] It should be noted that this embodiment does not limit the structure of the braided core mold 21, the side mold 22, and the molding die 23. For example, the axis of the braided core mold 21 can be a straight line or a curve, and the outer surface of the braided core mold 21 can be a plane or a curved surface; the axis of the side mold 22 can be a straight line or a curve, and the outer surface of the side mold 22 can be a plane or a curved surface; the cavity of the molding die 23 is set according to the shape and size of the composite material workpiece. It is understood that designing the structure of the braided core mold 21, the side mold 22, and the molding die 23 according to the structure of the composite material workpiece is prior art in this field and will not be described in detail here.

[0098] It is understandable that the axial direction of the braided mandrel 21 is parallel to the axial direction of the composite material workpiece, and the axial direction, the first direction, and the second direction of the braided mandrel 21 are perpendicular to each other.

[0099] For example, such as Figure 2 As shown, the composite material workpiece includes a main body 1a and a vertical rib 1c. The main body 1a has a C-shaped structure, and the vertical rib 1c is located on the back of the C-shaped structure. The distance between the vertical rib 1c and the two ends of the main body 1a along the first direction is not equal.

[0100] Furthermore, the composite material workpiece manufacturing method of this embodiment requires the use of two braided mandrels 21. The cross-sections of the two braided mandrels 21 are rectangular, and the widths D of the two braided mandrels 21 along the first direction are different. This causes the first braided member 11 and the connecting member 13 sandwiched between the two braided mandrels 21 to form vertical ribs 1c, and the main body 1a of a C-shaped structure is formed by making a flange 1b. It should be noted that the composite material workpiece manufacturing method of this embodiment can produce two composite material workpieces at once.

[0101] In other embodiments, such as Figure 3As shown, the composite material workpiece has a groove on one side along the first direction. In other words, the cross-section of the composite material workpiece can also be a variable cross-section, and the axis of the composite material workpiece is curved. Of course, in other embodiments, multiple vertical ribs 1c can be provided, and the multiple vertical ribs 1c are spaced apart along the first direction. In this case, multiple braided mandrels 21 are required so that a vertical rib 1c is formed between two adjacent braided mandrels 21.

[0102] For example, Figure 4 This illustrates a control flow for manufacturing composite material workpieces. Figure 4 The method for manufacturing composite material workpieces shown includes the following steps:

[0103] S101, such as Figure 5 As shown, a first braided piece 11 is formed on the outside of at least two braided core molds 21 by weaving, and the first braided piece 11 is sleeved on the outside of the braided core mold 21.

[0104] In other words, the first braided piece 11 is arranged end-to-end around the outside of the braided core mold 21 along its axial direction; that is, the cross-section of the first braided piece 11 is a ring structure. The cross-section of the first braided piece 11 is perpendicular to the axial direction of the braided core mold 21.

[0105] S102, such as Figure 6 As shown, at least two braided core molds 21 are connected sequentially along a first direction to form a first preform.

[0106] For example, a clamp can be used to fix two adjacent braided core molds 21. The structure of the clamp and the method of fixing the braided core molds 21 by the clamp are existing technologies and will not be described in detail here.

[0107] S103, such as Figure 7 As shown, a connector 13 is provided at the connection of two adjacent braided core molds 21, and the first braided piece 11 on the two adjacent braided core molds 21 is in contact with the connector 13.

[0108] It should be noted that the connector 13 is a strip-shaped structure extending along the axial direction of the braided core mold 21; furthermore, along the axial direction of the braided core mold 21, the length of the connector 13 is equal to the length of the first braid 11.

[0109] S104, such as Figure 8 As shown, a second woven piece 12 is formed by weaving on the outside of the first preform, and the second woven piece 12 is fitted onto the outside of the first preform to form a second preform.

[0110] In other words, the second braid 12 is arranged around the outside of the second preform along the axial direction of the braiding core mold 21, so that the second braid 12 completely wraps the multiple first braids 11 and connectors 13.

[0111] S105, such as Figure 9 As shown, two side molds 22 are respectively disposed on both sides of the second preform along the second direction; the second direction is perpendicular to the first direction.

[0112] S106. Cut the side braided portions of the braided part located at both ends of the second preform along the first direction; the side braided portion is the part of the braided part located on one side of the braided core mold 21 along the first direction.

[0113] It should be noted that a portion of the thickness of the side braided portion located at both ends of the second preform along the first direction is formed by the thickness of the second braided component 12, and another portion of the thickness is formed by the thickness of the first braided component 11.

[0114] For ease of description, the side braiding portions located at both ends of the second preform along the first direction are referred to as the outer braiding portions 15, and the remaining side braiding portions are referred to as the inner braiding portions 16. That is, any inner braiding portion 16 is located between two adjacent braiding core molds 21. In other words, the outer braiding portion 15 is used to form the flange 1b of the composite material workpiece, and the inner braiding portion 16 is used to form the vertical rib 1c of the composite material workpiece.

[0115] Step S106 involves cutting the outer braided portion 15.

[0116] S107, such as Figure 10 As shown, when folding the cut side knitting part, the side knitting part located on the same side as the side mold 22 at the cut is folded until it fits against the side mold 22.

[0117] Step S107 involves folding the cut outer braided portion 15.

[0118] S108. Pre-type the woven parts.

[0119] The flange 1b formed by the side braid after folding and cutting is positioned by the side mold 22, and the flange 1b is kept in contact with the side mold 22 by pre-forming, which can avoid deformation of the flange 1b and improve the molding quality of composite material workpieces.

[0120] S109, such as Figure 11 As shown, along the first direction from both ends of the second preform to the center of the second preform, the remaining side braided portions are cut and the braided core mold 21 is removed in sequence to produce two third preforms.

[0121] It should be noted that after step S108, the braided core molds 21 located at both ends of the second preform along the first direction are first removed, and then the inner braided portion 16 is cut sequentially from both ends of the second preform towards the center of the second preform along the first direction. After each set of inner braided portions 16 is cut, two braided core molds 21 can be removed.

[0122] S110. Using the molding die 23, the third preform is impregnated with reinforcing material and cured.

[0123] In step S110, the third preform is impregnated with reinforcing material and cured by using the molding die 23 through a closed-mold molding process.

[0124] For example, the molding die 23 is an RTM (Resin Transfer Moulding) die. Figure 13 As shown, the molding die 23 includes a bottom die 231, an upper die 232, a fixed core die 233, and multiple movable core dies 234. The fixed core die 233 is fixedly mounted on the bottom die 231. An installation cavity is provided between the bottom die 231 and the upper die 232, and the fixed core die 233 is fixedly mounted in the installation cavity. The movable core dies 234 are movably arranged. When installing the third preform, the movable core dies 234 can be moved as needed. After the third preform is placed, the upper die 232 is fixedly connected to the bottom die 231. The multiple movable core dies 234 can then be clamped by the upper die 232 and the bottom die 231 to prevent the movable core dies 234 from moving. Furthermore, the upper die 232 and the bottom die 231 can be fixedly connected by fasteners such as screws, and a sealing strip can be used to improve the sealing performance. The method and specific steps of impregnating and curing the third preform with reinforcing material through the molding die 23 are existing technologies and will not be described in detail here.

[0125] S111, such as Figure 12 As shown, demold to form a molded part.

[0126] S112. Trim the shape of the formed part.

[0127] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for manufacturing composite material workpieces, characterized in that, Includes the following steps: A first braided piece is formed on the outside of at least two braided core molds by weaving, and the first braided piece is sleeved on the outside of the braided core mold; At least two of the braided core molds are connected sequentially along a first direction to form a first preform, the first direction being perpendicular to the axial direction of the braided core mold (21); a second braid is formed by weaving on the outside of the first preform, the second braid being sleeved on the outside of the first preform to form a second preform; Along the first direction from both ends of the second preform towards the center of the second preform, the side braided portion of the braided piece is cut and the braided core mold is removed in sequence to produce two third preforms; the side braided portion is the part of the braided piece located on one side of the braided core mold along the first direction; The third preform is impregnated with reinforcing material and cured using a molding die.

2. The method for manufacturing composite material workpieces according to claim 1, characterized in that, Before weaving on the outside of the first preform and forming the second woven piece, the method further includes: providing a connector at the connection of two adjacent woven core molds, and ensuring that the first woven pieces on both adjacent woven core molds are in contact with the connector.

3. The method for manufacturing composite material workpieces according to claim 2, characterized in that, The first braided component includes a first braided portion and a second braided portion. The first braided portion is located on one side of the braided core mold along the first direction, and the first braided portion and the second braided portion are respectively located on two adjacent sides of the braided core mold. After at least two braided core molds are connected sequentially along a first direction, the first braided portions of two adjacent braided core molds abut against each other, and a gap is provided between the plane of the surface of the second braided portion facing away from the braided core mold and the first braided component on the two adjacent braided core molds, and the connector fills the gap; or, After at least two braided core molds are connected sequentially along a first direction, the first braided portions of two adjacent braided core molds are spaced apart, and a gap is provided between the plane of the surface of the second braided portion on the side away from the braided core mold and the first braided component on the two adjacent braided core molds, and the connector fills the gap.

4. The method for manufacturing composite material workpieces according to claim 2, characterized in that, The connector is made of the same material as the first braided component; and / or, The connector is made of the same material as the second braided component; and / or, The first braided component and the second braided component are made of the same material.

5. The method for manufacturing composite material workpieces according to claim 1, characterized in that, Along the first direction from both ends of the second preform towards the center of the second preform, the side braided portion is cut sequentially and the braided core mold is removed to produce two third preforms, including the following steps: The side braided portions located at both ends of the second preform along the first direction are cut; The side knitted portion after folding and cutting; The woven part is pre-shaped; Along the first direction from both ends of the second preform towards the center of the second preform, the remaining side braided portions are cut and the braided core mold is removed in sequence to produce two third preforms.

6. The method for manufacturing composite material workpieces according to claim 5, characterized in that, Before the side braided portion is folded and cut, the method further includes: placing two side molds on both sides of the second preform along the second direction; the second direction is perpendicular to the first direction and perpendicular to the axial direction of the braided core mold (21); When folding the cut side knitted portion, the side knitted portion located on the same side as the side mold at the cut is folded until it fits against the side mold.

7. The method for manufacturing composite material workpieces according to claim 1, characterized in that, After the first preform is manufactured, the first woven piece is pre-shaped; and / or, After the second preform is made, the second braid or the second braid and the first braid are pre-shaped.

8. The method for manufacturing composite material workpieces according to claim 7, characterized in that, After the third preform is manufactured, the method further includes: trimming the shape of the third preform; and / or, After the third preform is impregnated with reinforcing material and cured, the process further includes: Demolding to produce a molded part; Adjust the shape of the molded part.

9. The method for manufacturing composite material workpieces according to any one of claims 1-8, characterized in that, The braided core mold includes at least two detachably connected mold sections; When removing the braided core mold, at least two of the molds are disassembled separately.

10. The method for manufacturing composite material workpieces according to any one of claims 1-8, characterized in that, The first braided component includes at least one braided layer; and / or, The second braided component includes at least one braided layer.

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