A forming die for a tapered dovetail composite preform and a production process thereof

Abstract

The application discloses a forming die for a tapered dovetail composite material preform and a production process thereof. The die comprises a bottom plate assembly, two side plates and a top plate assembly. The bottom plate assembly comprises a bottom plate main body and a baffle wall. The baffle wall is arranged in the middle of the bottom plate main body and divides the bottom plate main body into two bottom plate forming surfaces. The two side faces of the baffle wall are provided with baffle wall forming surfaces. The two side plates are respectively arranged in a bottom plate forming surface. The side plates are provided with a plurality of side plate forming recesses. The inner surfaces of the forming recesses are first forming surfaces. The top plate assembly is fixed on the side plates and is provided with a top pressing forming surface on the bottom face. The bottom plate forming surfaces, the first forming surfaces, the baffle wall forming surfaces and the top pressing forming surface form a plurality of forming cavities. Carbon fiber material is laid in the forming cavities. The composite material preform can be produced by using prepreg as the material. The composite material preform does not need to be subjected to mechanical processing on the outer surface, the manufacturing cost is reduced, and the mechanical properties of the product are improved.

Description

Technical Field

[0001] This application relates to a molding die for a conical dovetail composite material preform and its manufacturing process, belonging to the field of aerospace equipment technology. Background Technology

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

[0003] Existing composite material preforms generally have the following disadvantages:

[0004] 1. Generally, carbon blocks are used for machining, and all outer surfaces need to be machined, resulting in a long machining cycle and high overall cost;

[0005] 2. Machining can damage carbon fibers and reduce their mechanical properties;

[0006] 3. The mechanical properties of carbon blocks are isotropic, resulting in insufficient design freedom and hindering the optimization of structural performance.

[0007] In existing technologies, conical dovetail composite preforms (such as...) Figure 1 As shown, it is widely used in the aerospace field and is often used in groups. A group of conical dovetail composite material preforms have similar shapes, but their models and sizes may differ. In addition to the common disadvantages mentioned above, there are also performance differences among the same group of workpieces, which leads to complex maintenance issues in the later stages.

[0008] Therefore, there is a need for a technology that can produce composite preforms using prepreg as the material, including the molds used and the specific production process. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this application provides a molding die for a conical dovetail composite material preform, comprising:

[0010] A base plate assembly, the base plate assembly including a base plate body and a retaining wall, the retaining wall being located in the middle of the base plate body and dividing the top surface of the base plate body into two mutually symmetrical base plate forming surfaces, and the two sides of the retaining wall having retaining wall forming surfaces;

[0011] Two side plates are respectively installed in the forming surface of the base plate. The side plates are tightly attached to the main body of the base plate, and the ends of the side plates abut against the retaining wall. The side plates are provided with a plurality of side plate forming recesses, 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 to 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 base plate forming surface, several first forming surfaces, retaining wall forming surfaces, and top pressing forming surfaces together form several forming cavities that can be covered with forming materials.

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

[0015] In the above technical solution, further, the base plate is provided with a plurality of positioning blocks that correspond one-to-one with the side plate forming recesses, and the positioning blocks protrude from the surface of the base plate; the top surface of the positioning block is a 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 sides of the retaining wall are provided with a plurality of arc-shaped protrusions that correspond one-to-one with the side plate forming recesses. The surface of the arc-shaped protrusion is the fourth forming surface. The first forming surface, the second forming surface, the third forming surface and the fourth forming surface constitute a forming cavity.

[0017] Furthermore, in the above technical solution, the shapes of several molding cavities are not entirely the same.

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

[0019] Furthermore, in the above technical solution, hoisting bolts are installed on both ends of the retaining wall.

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

[0021] On the other hand, this application also provides a manufacturing process for a conical dovetail composite material preform, characterized by using the above-mentioned molding die for the conical dovetail composite material preform, comprising the following steps:

[0022] Step S1: Install the two side plates onto the forming surface of the base plate, so that the ends of the side plates abut against the retaining wall, to complete the assembly of the base plate assembly and the side plates;

[0023] Step S2: Lay out the molding material in the area enclosed by the base plate molding surface, several first molding surfaces, and the retaining wall molding surface;

[0024] Step S3: Fix the top plate assembly to the top surface of the side plate, so that the top pressing and forming surface acts on the laid molding material; and tighten and fix the top plate assembly, side plate and bottom plate assembly.

[0025] Step S4: Place the assembled mold in an oven and maintain it at a preset temperature for a period of time to complete the curing and molding process;

[0026] Step S5: Remove from the oven and cool to room temperature before demolding.

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

[0028] First, place the pressure block in the side plate forming recess, and then fix the top plate and bottom plate assembly to fix the pressure block in the forming recess.

[0029] In the above technical solution, the top plate assembly and the bottom plate assembly are tightened 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 for a preset time; the molding mold is then removed, and the top plate assembly and the bottom plate assembly are tightened for the second time using the pull-in bolts, and the entire molding mold is placed back into the oven and heated to a preset temperature for a preset time.

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

[0031] The molding die and manufacturing process for a conical dovetail composite material preform provided in this application have the following advantages:

[0032] The molding die for the conical dovetail composite preform provided in this application utilizes a base plate molding surface, several first molding surfaces, a retaining wall molding surface, and a top pressing molding surface to form a molding cavity. Carbon fiber material is laid within the molding cavity, enabling the production of composite preforms using prepreg as the material. This model significantly reduces the difficulty of composite material layup, improves work efficiency and product quality. Compared to existing carbon block processing methods, this molding die reduces manufacturing costs and improves product mechanical properties because it eliminates the need for machining the outer surface. Attached Figure Description

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

[0034] Figure 1 A schematic diagram of the three-dimensional structure of a conical dovetail composite material preform;

[0035] Figure 2A three-dimensional structural schematic diagram of a molding die for a conical dovetail composite material preform provided for an embodiment of this application;

[0036] Figure 3 An exploded view of a molding die for a conical dovetail composite material preform provided for an embodiment of this application;

[0037] Figure 4 A cross-sectional view of a molding die for a tapered dovetail composite preform provided for an embodiment of this application in a first direction;

[0038] Figure 5 A cross-sectional view of a molding die for a tapered dovetail composite preform provided for an embodiment of this application in a second direction;

[0039] Figure 6 A three-dimensional structural schematic diagram of a base plate assembly provided for an embodiment of this application;

[0040] Figure 7 A schematic diagram of the upright structure of a side plate provided for an embodiment of this application;

[0041] Figure 8 A schematic diagram of the upright structure of a pressure block provided for an embodiment of this application;

[0042] Figure 9 A flowchart illustrating the manufacturing process of a conical dovetail composite material preform provided for embodiments of this application.

[0043] 100-Base; 200-Base plate assembly; 300-Side plate; 400-Top plate assembly; 500-Vertical tension bolt; 600-Horizontal tension bolt; 700-Lifting bolt; 800-Conical dovetail composite preform; 210-Base plate body; 220-Retaining wall; 221-Arched protrusion; 230-Positioning block; 310-Molding recess; 320-Demolding hole; 410-Top plate; 420-Pressure block. Detailed Implementation

[0044] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0045] The embodiments based on the concepts of this disclosure can be modified in various ways and can take many forms. Therefore, specific embodiments will be illustrated by way of example in the accompanying drawings and described in detail in this specification or application. However, this is not intended to limit the embodiments based on the concepts of this disclosure to the specific forms disclosed, and should be understood to include all modifications, equivalents, and substitutions contained within the spirit and technology of this disclosure.

[0046] The terms "first" and / or "second" may be used to describe multiple constituent elements, but the constituent elements are not limited by the terms. The terms are used only to distinguish one constituent element from other constituent elements; for example, without exceeding the scope of the claims based on the concepts of this disclosure, a first constituent element may be named a second constituent element, and similarly, a second constituent element may be named a first constituent element.

[0047] When it is said that a constituent element is "connected" or "continued" to another constituent element, it should be understood that it can be directly connected to or continued to the other constituent element, or that there are other constituent elements in between. Conversely, when it is said that a constituent element is "directly connected" or "directly continued" to another constituent element, it should be understood that there are no other constituent elements in between. Other expressions used to describe the relationship between constituent elements, such as "between" or "directly between" or "adjacent to" or "directly adjacent to", should also be interpreted in the same way.

[0048] The terminology used in this specification is for illustrative purposes only and is not intended to limit the scope of this disclosure. Unless otherwise clearly stated in the text, singular expressions include plural expressions. In this specification, terms such as "comprising" or "having" specify the presence of predetermined features, numbers, steps, actions, constituent elements, components, or combinations thereof, and should be understood as not precluding the presence or additional possibilities 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, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms that are identical to their definitions in commonly used dictionaries shall be interpreted in a meaning consistent with their literal meaning in the relevant art, and shall not be ideally or excessively interpreted in a formal sense unless explicitly defined in this specification.

[0050] Existing composite material preforms generally use carbon blocks for machining, requiring processing of all outer surfaces. This results in a long machining cycle, high cost, and poor performance. Conical dovetail composite material preforms, on the other hand,

[0051] Because these components are often used in groups, and there are performance differences within the same group, maintenance becomes complex. Therefore, a technology is needed to produce composite preforms using prepreg as the material.

[0052] Therefore, this application provides a molding die for a conical dovetail composite material preform, including a base plate assembly, two side plates, and a top plate assembly. The base plate assembly includes a base plate body and a retaining wall. The retaining wall is located in the middle of the base plate body and divides the top surface of the base plate body into two symmetrical base plate forming surfaces. The two sides of the retaining wall are provided with retaining wall forming surfaces. The two side plates are respectively installed in one of the base plate forming surfaces. The side plates are tightly attached to the base plate body, and the ends of the side plates abut against the retaining wall. The side plates are provided with a plurality of side plate forming recesses, and the inner surface of the forming recesses is a first forming surface. The top plate assembly is fixed to the top surface of the side plates, and the bottom surface of the top plate assembly is provided with a pressing forming surface. The base plate forming surface, the plurality of first forming surfaces, the retaining wall forming surface, and the pressing forming surface together form a plurality of forming cavities for covering molding materials.

[0053] The molding die for the conical dovetail composite preform provided in this application utilizes a base plate molding surface, several first molding surfaces, a retaining wall molding surface, and a top pressing molding surface to form a molding cavity. Carbon fiber material is laid within the molding cavity, enabling the production of composite preforms using prepreg as the material. This model significantly reduces the difficulty of composite material layup, improves work efficiency and product quality. Compared to existing carbon block processing methods, this molding die reduces manufacturing costs and improves product mechanical properties because it eliminates the need for machining the outer surface.

[0054] Figure 2 A three-dimensional structural schematic diagram of a molding die for a conical dovetail composite material preform provided for an embodiment of this application; Figure 3 An exploded view of a molding die for a conical dovetail composite material preform provided for an embodiment of this application; Figure 4 A cross-sectional view of a molding die for a tapered dovetail composite preform provided for an embodiment of this application in a first direction; Figure 5 A cross-sectional view of a molding die for a tapered dovetail composite preform provided for an embodiment of this application in a second direction.

[0055] Please see Figures 2-5 The present application provides a molding die for a conical dovetail composite material preform, including a base 100, a bottom plate assembly 200, two side plates 300, a top plate assembly 400, several vertical tension bolts 500, several horizontal tension bolts 600, and two lifting bolts 700.

[0056] The base 100 is fixed below the base plate assembly 200 to support the entire molding mold and facilitate the transfer of the mold by forklifts and other tools.

[0057] The base plate assembly 200 includes a base plate body 210 and a retaining wall 220. The retaining wall 220 is located in the middle of the base plate body 210, dividing the top surface of the base plate body 210 into two symmetrical base plate forming surfaces. The retaining wall 220 has retaining wall 220 forming surfaces on both sides. Two side plates 300 are respectively installed within one of the base plate forming surfaces. The side plates 300 are tightly attached to the base plate body 210, and their ends abut against the retaining wall 220. Several horizontal tension bolts 600 are used to connect the side plates 300 and the retaining wall 220. The side plates 300 have several side... The plate 300 has a forming recess 310, the inner surface of which is a first forming surface; the top plate assembly 400 is fixed to the top surface of the side plate 300, and several 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 pressing forming surface; the bottom plate forming surface, several first forming surfaces, the retaining wall 220 forming surface and the top pressing forming surface together form several forming cavities that can be covered with forming materials. In this embodiment, the forming material is carbon fiber prepreg or carbon fiber fabric.

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

[0059] In this embodiment, lifting bolts 700 are installed on both ends of the retaining wall 220. The lifting bolts facilitate the hoisting by the overhead crane, making it convenient to put the mold into the oven and take it out of the oven, or to perform other storage operations of the mold.

[0060] See Figure 5 In this embodiment, the shapes of the molding cavities are not entirely the same. The mold can mold multiple pairs of conical dovetail composite material preforms at once, with each pair symmetrically distributed along the retaining wall 220. The figure shows one pair of medium-sized conical dovetail composite material preforms and three pairs of small-sized conical dovetail composite material preforms.

[0061] Of course, this is only one specific embodiment of this application. The number of molding cavity models and the number of each model can be flexibly set according to actual needs.

[0062] See Figure 5 In this embodiment, the side plate 300 is provided with a demolding hole 320, and the tail end of the demolding bolt adapted to the demolding hole 320 acts on the side of the retaining wall 220. The demolding bolt is inserted into the demolding hole 320 and pushed out of the side plate 300.

[0063] The structure of each major component is as follows Figure 6-8 As shown in the accompanying drawings, further explanations will be provided.

[0064] Figure 6This is a three-dimensional structural diagram of a base plate assembly provided for an embodiment of this application.

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

[0066] The base plate 210 is provided with a plurality of positioning blocks 230 corresponding one-to-one with the forming recesses 310 of the side plate 300. The positioning blocks 230 protrude from the surface of the base plate, and the top surface of the positioning blocks 230 is the third forming surface. The side plate 300 can slide to the working position from the side, closely abutting the base plate 210, with the triangular positioning blocks 230 as guides, that is, the end face of the side plate 300 abuts against the retaining wall 220.

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

[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 that correspond one-to-one with the forming recesses 310 of the side plate 300. The surface of the arc-shaped protrusions 221 is the fourth forming surface, namely the retaining wall 220 forming surface.

[0069] Figure 7 This is a schematic diagram of the upright structure of a side panel provided for an embodiment of this application.

[0070] See Figure 7 The side plate 300 is provided with a number of side plate 300 forming recesses 310. The side plate 300 forming recesses 310 are generally triangular and can be matched with the positioning block 230 of the base plate body 210. The inner surface of the forming recesses 310 is the first forming surface.

[0071] Figure 8 This is a schematic diagram of the vertical structure of a pressure block provided for an embodiment of this 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 pressure blocks 420 corresponding one-to-one with the forming 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 pressure blocks 420 in the forming recesses 310; the top surface of the pressure block 420 is a plane, which is horizontal in the working state; the bottom surface of the pressure block 420 forms an angle with the top surface, that is, the two are not parallel surfaces, and the bottom surface of the pressure block 420 is the second forming surface. The first forming surface, the second forming surface, the third forming surface, and the fourth forming surface constitute a forming cavity.

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

[0074] Figure 9 A flowchart illustrating the manufacturing process of a conical dovetail composite material preform provided for embodiments of this application.

[0075] like Figure 9 As shown, this application also provides a manufacturing process for a conical dovetail composite material preform, which uses the aforementioned molding die and includes the following steps:

[0076] Step S1: Install the two side plates 300 onto the forming surface of the base plate, so that the ends of the side plates 300 abut against the retaining wall 220, thereby completing the assembly of the base plate assembly 200 and the side plates 300.

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

[0078] Step S2: Lay out the molding material in the area enclosed by the bottom plate molding surface, several first molding surfaces and the retaining wall 220 molding surface.

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

[0080] Step S3: Fix the top plate assembly 400 to the top surface of the side plate 300, so that the top pressing and forming surface acts on the laid 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 pressure block 420 in the molding recess 310 of the side plate 300 and press it on the top surface of the laid molding material. Then, fix the top plate 410 and the bottom plate assembly 200 with vertical tension bolts 500 to fix the pressure block 420 in the molding recess 310.

[0083] Step S4: Place the assembled mold in an oven and maintain it at a preset temperature for a period of time to complete the curing and molding process.

[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: Remove from the oven and cool to room temperature before demolding.

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

[0087] Remove the vertical tension bolt 500, insert the demolding bolt into the demolding hole 320, push the side plate 300 out, remove the side plate 300, then remove the pressure block 420, and finally remove the product.

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

[0089] The top plate assembly 400 and the bottom plate assembly 200 are tightened for the first time using the pull-in bolts. The entire molding mold is then placed in an oven and heated to a preset temperature for a preset time. The molding mold is then removed, and the top plate assembly 400 and the bottom plate assembly 200 are tightened for the second time using the pull-in bolts. The entire molding mold is then placed back into the oven and heated to a preset temperature for a preset time.

[0090] Furthermore, it should be understood that although this specification describes the embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole and the technical solutions in each embodiment.

Claims

1. A process for the production of a tapered dovetail composite preform, characterized in that, A forming mold using a tapered dovetail composite preform, the forming mold comprising: a bottom plate assembly, the bottom plate assembly comprising a bottom plate body and a barrier wall, the barrier wall being located in the middle of the bottom plate body to divide the top surface of the bottom plate body into two bottom plate forming surfaces which are symmetrical to each other, the two side surfaces of the barrier wall being provided with barrier wall forming surfaces; two side plates, the two side plates being respectively installed in one of the bottom plate forming surfaces, the side plates being tightly attached to the bottom plate body, the end portions of the side plates abutting against the barrier wall, the side plates being provided with a plurality of side plate forming recesses, the inner surfaces of the forming recesses being first forming surfaces; and a top plate assembly, the top plate assembly being fixed on the top surfaces of the side plates, the bottom surface of the top plate assembly being provided with a top pressing forming surface; the bottom plate forming surfaces, the plurality of first forming surfaces, the barrier wall forming surfaces and the top pressing forming surface jointly forming a plurality of forming cavities in which the forming material can be laid; the production process comprising the following steps: Step S1, installing the two side plates to the bottom plate forming surfaces so that the end portions of the side plates abut against the barrier wall to complete the assembly of the bottom plate assembly and the side plates; Step S2, laying the forming material in the area surrounded by the bottom plate forming surfaces, the plurality of first forming surfaces and the barrier wall forming surfaces; Step S3, fixing the top plate assembly on the top surfaces of the side plates so that the top pressing forming surface acts on the laid forming material, and tightly fixing the top plate assembly, the side plates and the bottom plate assembly; Step S4, placing the assembled mold in an oven, keeping at a preset temperature for a period of time to complete the curing forming; Step S5, cooling to room temperature and demolding after taking out of the oven.

2. The process for producing a tapered dovetail composite preform according to claim 1, wherein The top plate assembly comprises a top plate and a plurality of pressing blocks corresponding to the side plate forming recesses one by one; the top plate is fixedly connected with the bottom plate assembly to fix the pressing blocks in the forming recesses; the bottom surface of the pressing block is a second forming surface, and the first forming surface, the second forming surface, the barrier wall forming surface and the bottom plate forming surface constitute a forming cavity.

3. The process for producing a tapered dovetail composite preform according to claim 2, wherein The bottom plate is provided with a plurality of positioning blocks corresponding to the side plate forming recesses one by one, the positioning blocks being protruded from the surface of the bottom plate; the top surface of the positioning block is a third forming surface, and the first forming surface, the second forming surface, the third forming surface and the barrier wall forming surface constitute a forming cavity.

4. The process for producing a tapered dovetail composite preform according to claim 3, wherein The two side surfaces of the barrier wall are provided with a plurality of arc-shaped protrusions corresponding to the side plate forming recesses one by one, the surfaces of the arc-shaped protrusions being fourth forming surfaces, and the first forming surface, the second forming surface, the third forming surface and the fourth forming surface constituting a forming cavity.

5. The process for producing a tapered dovetail composite preform according to claim 1, wherein The shapes of the plurality of forming cavities are not completely the same.

6. The process for producing a tapered dovetail composite preform according to claim 1, wherein The side plate is provided with a demolding hole, and the tail end of a demolding bolt matched with the demolding hole acts on the side surface of the barrier wall.

7. The process for producing a tapered dovetail composite preform according to claim 2, wherein In the step S3, the following is included: First, the pressing blocks are placed in the side plate forming recesses, and then the top plate and the bottom plate assembly are fixedly connected to fix the pressing blocks in the forming recesses.

8. The process for producing a tapered dovetail composite preform according to claim 1, wherein The top plate assembly and the bottom plate assembly are first tightly fixed by using the pull-in bolts, the entire forming mold is put into an oven and heated to a preset temperature, and the preset time is kept; the forming mold is taken out, the top plate assembly and the bottom plate assembly are secondly tightly fixed by using the pull-in bolts, and the entire forming mold is again put into the oven and heated to the preset temperature, and the preset time is kept.

9. The process for producing a tapered dovetail composite preform according to claim 1, wherein In the step S4, the preset temperature of the oven is 130-180℃, and the curing time in the oven is 5-8 hours.

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