Forming mold of conical dovetail composite material preform and production process of conical dovetail composite material preform

Abstract

The invention discloses a forming die of a conical dovetail composite material prefabricated body and a production process of the forming die. The die comprises a bottom plate assembly, two side plates and a top plate assembly. The bottom plate assembly comprises a bottom plate body and a retaining wall, the retaining wall is located in the middle of the bottom plate body and divides the bottom plate body into two bottom plate forming faces, and retaining wall forming faces are arranged on the two side faces of the retaining wall. The two side plates are respectively mounted in one bottom plate forming surface, a plurality of side plate forming recesses are formed in the side plates, and the inner surfaces of the forming recesses are first forming surfaces; the top plate assembly is fixed to the side plates, and the bottom face is provided with a top pressing forming face. The bottom plate forming surface, the first forming surface, the retaining wall forming surface and the top pressure forming surface form a plurality of forming cavities, the carbon fiber materials are laid in the forming cavities, the prepreg can be used as the material to produce the composite material prefabricated body, the outer surface does not need to be machined, the manufacturing cost is reduced, and the mechanical property of the product is improved.

Description

Technical Field

[0001] The present application relates to a forming die for a tapered dovetail composite material preform and a production process thereof, belonging to the technical field of aerospace equipment. Background Art

[0002] Composite preforms and a variety of industries and applications, including aerospace, automotive, medical devices, construction, etc. Composite materials are usually composed of two or more materials with different properties to obtain better performance than a single material, such as higher strength-to-weight ratio, corrosion resistance and design flexibility. Composite preforms can greatly reduce the difficulty of composite material laying and improve work efficiency and product quality.

[0003] The composite material preforms in the prior art generally have the following disadvantages:

[0004] 1. Carbon blocks are generally used for processing, and the outer surface needs to be processed, the machining cycle is long, and the comprehensive cost is high;

[0005] 2. Machining will damage carbon fiber and reduce its mechanical properties;

[0006] 3. The mechanical properties of carbon blocks are isotropic, and the design freedom is insufficient, which is not conducive to optimizing structural performance.

[0007] In the prior art, a conical dovetail composite preform (such as Figure 1 As shown in the figure, it is widely used in the aerospace field and is often used in groups. A group of conical dovetail composite preforms have similar shapes, but may have different models and sizes. For the grouped conical dovetail composite preforms, in addition to the general disadvantages mentioned above, there are also performance differences between the workpieces in the same group, which leads to complex maintenance problems in the later stage.

[0008] Therefore, there is a need for a related technology that can produce a composite material preform using prepreg as a material, and the related technology includes the mold used and the specific production process. Summary of the invention

[0009] In view of the shortcomings of the prior art, the present application provides a forming die for a tapered dovetail composite material preform, comprising:

[0010] A bottom plate assembly, the bottom plate assembly comprising a bottom plate body and a retaining wall, the retaining wall being located in the middle of the bottom plate body and dividing the top surface of the bottom plate body into two symmetrical bottom plate forming surfaces, and retaining wall forming surfaces are provided on both side surfaces of the retaining wall;

[0011] Two side plates, the two side plates are respectively installed in a bottom plate forming surface, the side plates are closely attached to the bottom plate body, and the ends of the side plates are against the retaining wall; a plurality of side plate forming recesses are provided on the side plates, and the inner surface of the forming recesses is the first forming surface;

[0012] and a top plate assembly, the top plate assembly being fixed on the top surface of the side plate, the bottom surface of the top plate assembly being provided with a top pressing forming surface;

[0013] The bottom plate forming surface, the plurality of first forming surfaces, the retaining wall forming surface and the top pressure forming surface together enclose a plurality of forming cavities that can be covered with forming materials.

[0014] In the above technical solution, further, the top plate assembly includes a top plate and a plurality of pressing blocks corresponding one by one to the molding recesses of the side plates; the top plate is fixedly connected to the bottom plate assembly to fix the pressing blocks in the molding recesses; the bottom surface of the pressing blocks is the second molding surface, and the first molding surface, the second molding surface, the retaining wall molding surface and the bottom plate molding surface constitute a molding cavity.

[0015] In the above technical solution, further, the bottom plate is provided with a plurality of positioning blocks corresponding one-to-one to the forming depressions of the side plates, and the positioning blocks are raised from the surface of the bottom plate; the top surface of the positioning blocks is the third forming surface, and the first forming surface, the second forming surface, the third forming surface and the retaining wall forming surface constitute a forming cavity.

[0016] In the above technical solution, further, the two side surfaces of the retaining wall are provided with a plurality of arc-shaped protrusions corresponding one-to-one to the molded depressions of the side panels, the surface of the arc-shaped protrusions is the fourth molding surface, and the first molding surface, the second molding surface, the third molding surface and the fourth molding surface constitute a molding cavity.

[0017] In the above technical solution, further, the shapes of the plurality of molding cavities are not completely the same.

[0018] In the above technical solution, further, the side plate is provided with a demoulding hole, and the tail end of the demoulding bolt adapted to the demoulding hole acts on the side of the retaining wall.

[0019] In the above technical solution, further, both end surfaces of the retaining wall are installed with hanging bolts.

[0020] In the above technical solution, further, the molding material is carbon fiber prepreg or carbon fiber fabric.

[0021] On the other hand, the present application also provides a production process for a tapered dovetail composite material preform, characterized in that the above-mentioned forming mold for the tapered dovetail composite material preform is used, and the process comprises the following steps:

[0022] Step S1, installing the two side panels onto the bottom panel forming surface so that the ends of the side panels are against the retaining wall to complete the assembly of the bottom panel assembly and the side panels;

[0023] Step S2, laying molding material in the area surrounded by the bottom plate molding surface, the plurality of first molding surfaces and the retaining wall molding surface;

[0024] Step S3, fix the top plate assembly on the top surface of the side plate, so that the top pressure forming surface acts on the paved forming material; and tighten and fix the top plate assembly, the side plate and the bottom plate assembly;

[0025] Step S4, placing the assembled mold in an oven and maintaining it at a preset temperature for a period of time to complete the curing and molding;

[0026] Step S5, take the product out of the oven, cool it to room temperature, and demould it.

[0027] In the above technical solution, further, in the step S3, it includes:

[0028] Firstly, the pressing block is placed in the forming recess of the side plate, and then the top plate and the bottom plate assembly are fixedly connected to fix the pressing block in the forming recess.

[0029] In the above technical scheme, further, the top plate assembly and the bottom plate assembly are tightened and fixed for the first time by using the pull-in bolts, and the entire molding mold is placed in an oven and heated to a preset temperature and maintained for a preset time; the molding mold is taken out, and the top plate assembly and the bottom plate assembly are tightened for a second time by using the pull-in bolts, and the entire molding mold is placed in the oven again, heated to a preset temperature and maintained for a preset time.

[0030] In the above technical solution, further, the preset temperature of the oven is 130-180° C., and the curing time in the oven is 5-8 hours.

[0031] The present application provides a forming die and production process of a conical dovetail composite material preform, and the beneficial effects are as follows:

[0032] The forming mold of the conical dovetail composite material preform provided by the present application uses the bottom plate forming surface, a plurality of first forming surfaces, the retaining wall forming surface and the top pressure forming surface to form a forming cavity, and the carbon fiber material is laid in the forming cavity, so that the composite material preform can be produced with prepreg as the material. The model can greatly reduce the difficulty of composite material laying, improve work efficiency and product quality; compared with the existing carbon block processing method, the use of the forming mold reduces the manufacturing cost and improves the mechanical properties of the product because there is no need to machine the outer surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of a tapered dovetail composite material preform;

[0035] Figure 2A schematic diagram of the three-dimensional structure of a forming mold for a tapered dovetail composite material preform provided in an embodiment of the present application;

[0036] Figure 3 An exploded view of a forming mold for a tapered dovetail composite material preform provided in an embodiment of the present application;

[0037] Figure 4 A cross-sectional view of a forming mold of a tapered dovetail composite material preform in a first direction provided in an embodiment of the present application;

[0038] Figure 5 A cross-sectional view of a forming mold of a tapered dovetail composite material preform provided in an embodiment of the present application in a second direction;

[0039] Figure 6 A schematic diagram of a three-dimensional structure of a base plate assembly provided in an embodiment of the present application;

[0040] Figure 7 A schematic diagram of a side panel provided in an embodiment of the present application;

[0041] Figure 8 A schematic diagram of the structure of a compression block provided in an embodiment of the present application;

[0042] Fig. 9 A flow chart of a production process of a tapered dovetail composite material preform provided in an embodiment of the present application.

[0043] 100-base; 200-bottom plate assembly; 300-side plate; 400-top plate assembly; 500-vertical tension bolts; 600-horizontal tension bolts; 700-lifting bolts; 800-tapered dovetail composite material preform; 210-bottom plate body; 220-retaining wall; 221-arc-shaped protrusion; 230-positioning block; 310-molding depression; 320-demolding hole; 410-top plate; 420-pressing block. DETAILED DESCRIPTION

[0044] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0045] The embodiments based on the concepts of the present disclosure may be subjected to various changes and may have various forms, so specific embodiments will be exemplified in the drawings and described in detail in this specification or application. However, this is not to limit the embodiments based on the concepts of the present disclosure to specific disclosed forms, and should be understood to include all changes, equivalents and substitutes included in the ideas and technical scope of the present disclosure.

[0046] The terms "first" and "second" can be used to describe a variety of components, but the components are not limited by the terms. The terms are only used to distinguish one component from other components. For example, within the scope of the rights based on the concept of the present disclosure, the first component can be named as the second component, and similarly, the second component can also be named as the first component.

[0047] When a certain constituent element is said to be "connected" or "connected to" another constituent element, it should be understood that it can be directly connected to or connected to the other constituent element, or other constituent elements may be present in between. On the contrary, when a certain constituent element is said to be "directly connected to" or "directly connected to" another constituent element, it should be understood that no other constituent elements are present in between. Other expressions used to describe the relationship between constituent elements, that is, "between" or "directly between" or "adjacent to" or "directly adjacent to" etc., should also be interpreted in the same way.

[0048] The terms used in this specification are only used to illustrate specific embodiments and are not intended to limit the meaning of the present disclosure. Unless the contrary meaning is clearly stated in the context, the singular expression includes the plural expression. In this specification, the terms "including" or "having" are intended to specify the existence of a preset feature, number, step, action, constituent element, component or combination thereof, and should be understood as not excluding in advance the existence or additional possibility of one or more other features or numbers, steps, actions, constituent elements, components or combinations thereof.

[0049] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as those generally understood by a person of ordinary skill in the art to which the present disclosure belongs. Terms that are the same as those defined in a commonly used dictionary should be interpreted in a manner consistent with the meanings in the context of the relevant art, and should not be interpreted ideally or excessively as formal meanings unless explicitly defined in this specification.

[0050] The composite preforms in the prior art are generally processed by carbon blocks, and the outer surface needs to be processed, which takes a long time to process, is not only costly, but also has poor performance.

[0051] Since they are often used in groups, there are also performance differences between the same group of workpieces, which leads to complex maintenance problems. Therefore, a related technology that can produce composite material preforms using prepreg as a material is needed.

[0052] To this end, the present application provides a forming mold for a conical dovetail composite material preform, comprising a bottom plate assembly, two side plates and a top plate assembly; the bottom plate assembly comprises a bottom plate body and a retaining wall, the retaining wall is located in the middle of the bottom plate body and divides the top surface of the bottom plate body into two mutually symmetrical bottom plate forming surfaces, and retaining wall forming surfaces are provided on both side surfaces of the retaining wall; the two side plates are respectively installed in one of the bottom plate forming surfaces, the side plates are tightly attached to the bottom plate body, and the ends of the side plates are against the retaining wall; a plurality of side plate forming recesses are provided on the side plates, and the inner surface of the forming recesses is a first forming surface; the top plate assembly is fixed on the top surface of the side plate, and a top pressure forming surface is provided on the bottom surface of the top plate assembly; the bottom plate forming surface, a plurality of first forming surfaces, the retaining wall forming surface and the top pressure forming surface together form a plurality of forming cavities that can be covered with forming materials.

[0053] The forming mold of the conical dovetail composite material preform provided by the present application uses the bottom plate forming surface, a plurality of first forming surfaces, the retaining wall forming surface and the top pressure forming surface to form a forming cavity, and the carbon fiber material is laid in the forming cavity, so that the composite material preform can be produced with prepreg as the material. The model can greatly reduce the difficulty of composite material laying, improve work efficiency and product quality; compared with the existing carbon block processing method, the use of the forming mold reduces the manufacturing cost and improves the mechanical properties of the product because there is no need to machine the outer surface.

[0054] Figure 2 A schematic diagram of the three-dimensional structure of a forming mold for a tapered dovetail composite material preform provided in an embodiment of the present application; Figure 3 An exploded view of a forming mold for a tapered dovetail composite material preform provided in an embodiment of the present application; Figure 4 A cross-sectional view of a forming mold of a tapered dovetail composite material preform in a first direction provided in an embodiment of the present application; Figure 5 A cross-sectional view of a forming mold of a tapered dovetail composite material preform provided in an embodiment of the present application in a second direction.

[0055] See also Figure 2-Figure 5 A forming mold for a conical dovetail composite material preform provided in an embodiment of the present application includes a base 100, a bottom plate assembly 200, two side plates 300, a top plate assembly 400, a plurality of vertical tension bolts 500, a plurality of horizontal tension bolts 600 and two hanging bolts 700.

[0056] The base 100 is fixed below the bottom plate assembly 200 and is used to support the entire molding mold to facilitate the transportation of the mold by tools such as forklifts.

[0057] The bottom plate assembly 200 includes a bottom plate body 210 and a retaining wall 220. The retaining wall 220 is located in the middle of the bottom plate body 210 and divides the top surface of the bottom plate body 210 into two symmetrical bottom plate forming surfaces. The retaining wall 220 has retaining wall 220 forming surfaces on both sides. The two side plates 300 are respectively installed in one of the bottom plate forming surfaces. The side plates 300 are tightly attached to the bottom plate body 210, and the ends of the side plates 300 are against the retaining wall 220. A plurality of horizontal tension bolts 600 are used to connect the side plates 300 and the retaining wall 220. The side plates 300 are provided with a plurality of side The plate 300 has a molding recess 310, and the inner surface of the molding recess 310 is a first molding surface; the top plate assembly 400 is fixed on the top surface of the side plate 300, and a plurality of vertical tension bolts 500 are used to connect the top plate assembly 400, the side plate 300 and the bottom plate body 210; the bottom surface of the top plate assembly 400 is provided with a top pressure molding surface; the bottom plate molding surface, a plurality of first molding surfaces, the retaining wall 220 molding surface and the top pressure molding surface together form a plurality of molding cavities that can be covered with molding materials. In the present embodiment, the molding material is carbon fiber prepreg or carbon fiber fabric.

[0058] In this embodiment, the side plate 300 is fixed in two directions by means of horizontal tightening screws and vertical tightening screws, which can ensure the precise matching of several molding surfaces and ensure the molding quality.

[0059] In this embodiment, lifting bolts 700 are installed on both end surfaces of the retaining wall 220. The lifting screws are convenient for overhead crane lifting, and are convenient for placing the mold into the oven and taking it out of the oven, or other storage and movement operations of the mold.

[0060] See also Figure 5 In this embodiment, the shapes of the several molding cavities are not completely the same. The mold can mold multiple pairs of tapered dovetail composite material preforms at one time, and each pair of tapered dovetail composite material preforms are symmetrically distributed along the retaining wall 220. In the figure, there is a pair of medium-sized tapered dovetail composite material preforms and a total of three pairs of small-sized tapered dovetail composite material preforms.

[0061] Of course, this is only a specific embodiment of the present application. The number of types of molding cavities in the present application and the number of each type can be flexibly set according to actual needs.

[0062] See also Figure 5 In this embodiment, the side plate 300 is provided with a demoulding hole 320, and the tail end of the demoulding bolt adapted to the demoulding hole 320 acts on the side of the retaining wall 220. The demoulding bolt is installed into the demoulding hole 320 and the side plate 300 is ejected from the top.

[0063] The structures of the main components are as follows Figure 6-8 As shown, further explanation is given in conjunction with the accompanying drawings.

[0064] Figure 6A schematic diagram of the three-dimensional structure of a base plate assembly provided in an embodiment of the present application.

[0065] See also Figure 6 The base plate assembly 200 includes a base plate body 210 and a retaining wall 220 .

[0066] The bottom plate body 210 is provided with a plurality of positioning blocks 230 corresponding to the molding recesses 310 of the side plate 300. The positioning blocks 230 are protruded from the bottom plate surface, and the top surface of the positioning blocks 230 is the third molding surface. The side plate 300 can be closely attached to the bottom plate body 210 from the side, and slide to the working position with the triangular positioning blocks 230 as guides, that is, the end surface of the side plate 300 is against the retaining wall 220.

[0067] The retaining wall 220 is located in the middle of the bottom plate body 210 to divide the top surface of the bottom plate body 210 into two symmetrical bottom plate forming surfaces. The symmetrical bottom plate forming surfaces are used to produce the conical dovetail composite material preforms 800 in pairs.

[0068] The two sides of the retaining wall 220 are provided with retaining wall 220 forming surfaces. Specifically, the two sides of the retaining wall 220 are provided with a plurality of arc-shaped protrusions 221 corresponding to the forming recesses 310 of the side plate 300, and the surfaces of the arc-shaped protrusions 221 are the fourth forming surfaces, namely the retaining wall 220 forming surfaces.

[0069] Figure 7 A schematic diagram of the vertical structure of a side panel provided in an embodiment of the present application.

[0070] See also Figure 7 The side plate 300 is provided with a plurality of side plate 300 forming recesses 310, which are triangular in shape as a whole and can be matched with the positioning block 230 of the bottom plate body 210, and the inner surface of the forming recess 310 is the first forming surface.

[0071] Figure 8 A schematic diagram of the structure of a compression block provided in an embodiment of the present application.

[0072] like Figure 3-5 as well as Figure 8 As shown, the top plate assembly 400 includes a top plate 410 and a plurality of pressing blocks 420 corresponding to the molding recesses 310 of the side plate 300. The top plate 410 and the bottom plate assembly 200 are fixedly connected by vertical tension bolts 500 to fix the pressing blocks 420 in the molding recesses 310; the top surface of the pressing block 420 is a plane, which is a horizontal plane in the working state; the bottom surface of the pressing block 420 is at an angle to the top surface, that is, the two are non-parallel surfaces, and the bottom surface of the pressing block 420 is a second molding surface. The first molding surface, the second molding surface, the third molding surface and the fourth molding surface constitute a molding cavity.

[0073] In this embodiment, the top plate assembly 400 is composed of a detachable top plate 410 and a plurality of pressing blocks 420. The structure of the top plate assembly 400 of the present application is not limited to this. The plurality of pressing blocks 420 can also be integrally formed with the top plate 410, that is, a plurality of protrusions are provided under the top plate 410 to play the role of the pressing blocks 420.

[0074] Fig. 9 A flow chart of a production process of a tapered dovetail composite material preform provided in an embodiment of the present application.

[0075] like Fig. 9 As shown, the present application also provides a production process for a tapered dovetail composite material preform, the process using the above-mentioned forming mold, the production process comprising the following steps:

[0076] Step S1 , installing the two side panels 300 onto the bottom plate forming surface, so that the ends of the side panels 300 abut against the retaining wall 220 , so as to complete the assembly of the bottom plate assembly 200 and the side panels 300 .

[0077] Specifically, the side panel 300 is close to the top surface of the bottom plate body 210 and slides down to the working position under the guidance of the positioning block 230, that is, the end surface of the side panel 300 is against the retaining wall 220, and the side panel 300 and the retaining wall 220 are connected by horizontal tension bolts 600.

[0078] Step S2, laying molding material in the area surrounded by the bottom plate molding surface, the first molding surfaces and the molding surface of the retaining wall 220.

[0079] In this embodiment, the molding material is carbon fiber prepreg or carbon fiber fabric.

[0080] Step S3, fix the top plate assembly 400 on the top surface of the side plate 300, so that the top pressure molding surface acts on the paved molding material; and tighten and fix the top plate assembly 400, the side plate 300 and the bottom plate assembly 200.

[0081] In this embodiment, step S3 specifically includes:

[0082] First, place the pressing block 420 in the molding recess 310 of the side plate 300 and press it on the top surface of the covered molding material. Then, the top plate 410 and the bottom plate assembly 200 are fixedly connected by vertical tightening bolts 500 to fix the pressing block 420 in the molding recess 310.

[0083] Step S4, placing the assembled mold in an oven and maintaining it at a preset temperature for a period of time to complete the curing and molding.

[0084] In this embodiment, the preset temperature of the oven is 130-180° C., and the curing time in the oven is 5-8 hours.

[0085] Step S5, take the product out of the oven, cool it to room temperature, and demould it.

[0086] In this embodiment, step S5 specifically includes:

[0087] Remove the vertical tension bolts 500, use the demoulding bolts to install into the demoulding holes 320, push up and eject the side panels 300, remove the side panels 300, and then remove the pressing blocks 420 to finally eject the product.

[0088] In this embodiment, the tensioning of the top plate assembly 400 and the bottom plate assembly 200 is performed twice:

[0089] The top plate assembly 400 and the bottom plate assembly 200 are tightened and fixed for the first time using the pull-in bolts, and the entire molding mold is placed in an oven and heated to a preset temperature and maintained for a preset time; the molding mold is taken out, and the top plate assembly 400 and the bottom plate assembly 200 are tightened for a second time using the pull-in bolts, and the entire molding mold is placed in the oven again, heated to a preset temperature and maintained for a preset time.

[0090] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole and the technical solutions in each embodiment.

Claims

1. A forming die for a tapered dovetail composite material preform, characterized in that: include: A bottom plate assembly, the bottom plate assembly comprising a bottom plate body and a retaining wall, the retaining wall being located in the middle of the bottom plate body and dividing the top surface of the bottom plate body into two symmetrical bottom plate forming surfaces, and retaining wall forming surfaces are provided on both side surfaces of the retaining wall; Two side plates, the two side plates are respectively installed in a bottom plate forming surface, the side plates are closely attached to the bottom plate body, and the ends of the side plates are against the retaining wall; a plurality of side plate forming recesses are provided on the side plates, and the inner surface of the forming recesses is the first forming surface; and a top plate assembly, the top plate assembly being fixed on the top surface of the side plate, the bottom surface of the top plate assembly being provided with a top pressing forming surface; The bottom plate forming surface, the plurality of first forming surfaces, the retaining wall forming surface and the top pressure forming surface together enclose a plurality of forming cavities that can be covered with forming materials.

2. The forming die for a tapered dovetail composite material preform according to claim 1, characterized in that: The top plate assembly includes a top plate and a plurality of pressing blocks corresponding one to one with the molding recesses of the side plates; the top plate is fixedly connected to the bottom plate assembly to fix the pressing blocks in the molding recesses; the bottom surface of the pressing blocks is the second molding surface, and the first molding surface, the second molding surface, the retaining wall molding surface and the bottom plate molding surface constitute a molding cavity.

3. The forming die for a tapered dovetail composite material preform according to claim 2, characterized in that: The bottom plate is provided with a plurality of positioning blocks corresponding to the side plate forming depressions one by one, and the positioning blocks are raised from the bottom plate surface; the top surface of the positioning blocks is the third forming surface, and the first forming surface, the second forming surface, the third forming surface and the retaining wall forming surface constitute a forming cavity.

4. The forming die for a tapered dovetail composite material preform according to claim 3, characterized in that: The two side surfaces of the retaining wall are provided with a plurality of arc-shaped protrusions corresponding one to one with the molded depressions of the side panels, the surface of the arc-shaped protrusions is the fourth molding surface, and the first molding surface, the second molding surface, the third molding surface and the fourth molding surface constitute a molding cavity.

5. The forming die for a tapered dovetail composite material preform according to claim 1, characterized in that: The shapes of the several molding cavities are not exactly the same.

6. The forming die for a tapered dovetail composite material preform according to claim 1, characterized in that: The side plate is provided with a demoulding hole, and the tail end of the demoulding bolt adapted to the demoulding hole acts on the side of the retaining wall.

7. A production process for a tapered dovetail composite material preform, characterized in that: A forming mold for a tapered dovetail composite material preform as described in any one of claims 1 to 6 is used, comprising the following steps: Step S1, installing the two side panels onto the bottom panel forming surface so that the ends of the side panels are against the retaining wall to complete the assembly of the bottom panel assembly and the side panels; Step S2, laying molding material in the area surrounded by the bottom plate molding surface, the plurality of first molding surfaces and the retaining wall molding surface; Step S3, fix the top plate assembly on the top surface of the side plate, so that the top pressure forming surface acts on the paved forming material; and tighten and fix the top plate assembly, the side plate and the bottom plate assembly; Step S4, placing the assembled mold in an oven and maintaining it at a preset temperature for a period of time to complete the curing and molding; Step S5, take out of the oven, cool to room temperature, and demould.

8. The production process of a tapered dovetail composite material preform according to claim 7, characterized in that: In the step S3, it includes: Firstly, the pressing block is placed in the forming recess of the side plate, and then the top plate and the bottom plate assembly are fixedly connected to fix the pressing block in the forming recess.

9. The production process of a tapered dovetail composite material preform according to claim 7, characterized in that: The top plate assembly and the bottom plate assembly are tightened and fixed by the pull-in bolts for the first time, and the entire molding mold is placed in an oven and heated to a preset temperature and maintained for a preset time; the molding mold is taken out, and the top plate assembly and the bottom plate assembly are tightened for a second time by the pull-in bolts, and the entire molding mold is placed in the oven again, heated to a preset temperature and maintained for a preset time.

10. The production process of a tapered dovetail composite material preform according to claim 7, characterized in that: In step S4, the preset temperature of the oven is 130-180° C., and the curing time in the oven is 5-8 hours.

Images