Layering mold for prepreg of ceramic-based composite part

Abstract

The laying die comprises a base, a mounting frame, a laying mechanism and a pressing mechanism, the mounting frame is arranged on the base, and the pressing mechanism and the laying mechanism are sequentially and rotationally arranged on the mounting frame from top to bottom; the pressing mechanism is used for providing pressing force for the laying mechanism in real time when the parts are laid, so that the compactness of a laying layer is guaranteed; the pressing mechanism comprises a rotating shaft, a pressing wheel and a pressure adjusting structure, the rotating shaft is transversely mounted on the mounting frame, the pressing wheel is rotationally arranged in the middle of the rotating shaft corresponding to the laying mechanism, and the two ends of the rotating shaft extend out of the mounting frame and are connected with the mounting frame through the pressure adjusting structure. By additionally arranging the pressing mechanism, the problem that a traditional annular product is not compactly laid is solved, and therefore the quality problems of internal defects and wrinkles of a composite product due to the fact that the composite product is not compactly laid are solved.

Description

Technical Field

[0001] This invention belongs to the technical field of aerospace equipment manufacturing, specifically relating to a layup mold for prepreg of ceramic matrix composite parts. Background Technology

[0002] In existing technologies, traditional ceramic composite parts are typically ring-shaped, such as... Figure 1 As shown, the prepreg is in the form of long strips. During layup, the long strips of prepreg are wound and stacked layer by layer along the circumference until the required number of layers is reached. However, this method has the following drawbacks: (1) The layup operation is inconvenient. Since the layup mold is often made of steel, when laying up the prepreg, the layup mold is usually fixed on the workbench and the strip prepreg is manually wrapped onto the layup mold surface, which makes the operation very inconvenient. At the same time, it is not easy to arrange the layers neatly, which affects the layup quality. (2) The layup is not dense; because the prepreg is laid on the mold layer by layer by hand, the manual layup pressure is insufficient, and the layers are not dense. After multiple layers are stacked, the layup thickness will be greater than the thickness after curing. After the part is pressure cured, the diameter of the outer layer layup becomes smaller and the circumference remains unchanged, which causes wrinkles to appear on the part, resulting in the product being unqualified. (3) It is inconvenient to remove the parts after the layup is completed; after the layup is completed, the preform of the part needs to be removed from the mold for the next curing process. Since the part is fitted on the overall layup mold and the prepreg has a certain degree of stickiness, it is difficult to demold, and the layup may even be deformed after the preform is removed, making it impossible to continue the next process. Summary of the Invention

[0003] The purpose of this invention is to provide a layup mold for prepreg of ceramic matrix composite parts, which improves the density between layups and the efficiency of layup by setting up a clamping mechanism.

[0004] This invention is mainly achieved through the following technical solutions: A layup mold for prepreg of ceramic matrix composite parts includes a base, a mounting frame, a layup mechanism, and a clamping mechanism. The mounting frame is mounted on the base, and the clamping mechanism and the layup mechanism are rotatably mounted on the mounting frame from top to bottom. The clamping mechanism is used to provide clamping force to the layup mechanism in real time during the layup of the parts to ensure the compactness of the layup. The clamping mechanism includes a rotating shaft, a pressure roller, and a pressure adjustment structure. The rotating shaft is horizontally mounted on the mounting frame, and the pressure roller is rotatably mounted on the middle of the rotating shaft corresponding to the layup mechanism. The two ends of the rotating shaft extend out of the mounting frame and are connected to the mounting frame through the pressure adjustment structure.

[0005] To better realize the present invention, the pressure adjustment structure further includes a spring, a pull rod, and a force adjustment nut. Mounting blocks are respectively provided on both sides of the mounting bracket. A spring is provided between the end of the rotating shaft and the mounting block. One end of the pull rod passes through the mounting block and is connected to the spring. A force adjustment nut is provided at the free end of the pull rod.

[0006] To better realize the present invention, the stacking mechanism further includes a stacking mold and a rocker handle. A connecting shaft is provided through the middle of the stacking mold, and the two ends of the connecting shaft are rotatably connected to the mounting frame respectively. One end of the rocker handle is connected to the connecting shaft and is used to rotate the stacking mold.

[0007] To better realize the present invention, the layup mold further includes a circular core mold and a layup ring, and the layup ring is sleeved on the outer side of the circular core mold; the circular core mold is composed of a central core mold and side core molds located on both sides of the central core mold, and adjacent side core molds are fixed together by connecting blocks; a connecting shaft is provided through the middle of the central core mold.

[0008] To better realize the present invention, the two ends of the connecting block are respectively provided with square truncated cones, and the side core mold is provided with square conical grooves accordingly; a screw is provided in the middle of the connecting block, and the screw passes through the connecting block and is fixedly connected to the middle core mold.

[0009] To better realize the present invention, the intermediate core mold is further provided with a cross-shaped structure, and the inner side of the side core mold is provided with a corresponding slot.

[0010] To better realize the present invention, the mounting frame further includes two parallel frames, the top of the frame is provided with a pressing mounting groove along the Z direction, and the middle is provided with a top-opening stacking mounting groove, a rotating shaft is installed between adjacent pressing mounting grooves, and a connecting shaft is rotatably installed between adjacent stacking mounting grooves.

[0011] The beneficial effects of this invention are as follows: (1) This invention solves the problem of insufficient density in traditional ring-shaped product layup by adding a clamping mechanism, thereby resolving the quality issues of internal defects and wrinkling caused by insufficient density in composite products. Secondly, this invention solves the problem of difficulty in removing ring-shaped composite products after layup by using a circular core mold interlocking structure. This invention solves the problems of difficult layup operation, poor density between layers, and difficulty in demolding caused by traditional fixed layup molds.

[0012] (2) This invention uses a mold rotation and stacking method, which solves the problem of uneven layers caused by manual winding in traditional stacking schemes, thus improving the quality of the layers. The pressing mechanism of this invention adds a pressure adjustment structure, which can dynamically adjust the interlayer pressure during the stacking process, effectively solving the problem of insufficient interlayer density in traditional stacking methods. This invention solves the problems of difficulty in removing the preform from the stacking mold and deformation after removal by designing the stacking mechanism and stacking ring. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the winding of prepreg and layup die in the prior art; Figure 2 This is a schematic diagram of the structure of the present invention; Figure 3 This is a schematic diagram of the mounting bracket on the base; Figure 4 This is a schematic diagram of the stacking mechanism; Figure 5 This is a schematic diagram of the stacked mold structure; Figure 6 This is a schematic diagram of the clamping mechanism.

[0014] Wherein: 1-Clamping mechanism, 11-Pressure roller, 12-Bearing, 13-Rotating shaft, 14-Spring, 15-Pull rod, 16-Force adjusting nut, 2-Laying mechanism, 21-Laying mold, 211-Intermediate core mold, 212-Side core mold, 213-Laying ring, 214-Connecting block, 22-Handle, 3-Base, 4-Laying mounting groove, 5-Clamping mounting groove, 6-Mounting block. Detailed Implementation

[0015] Example 1: A layup mold for prepreg of ceramic matrix composite parts, such as Figures 2-6 As shown, it includes a base 3, a stacking mechanism 2, a clamping mechanism 1, and a mounting bracket. Figure 2 and Figure 3 As shown, the base 3 is provided with a mounting bracket, which is used to support and install the stacking mechanism 2 and the clamping mechanism 1. The base 3 includes a stacking mounting groove 4 for installing the stacking mechanism 2, a clamping mounting groove 5 for installing the clamping mechanism 1, and a mounting block 6 for installing the pressure adjustment structure.

[0016] like Figure 2 , Figure 4 and Figure 5As shown, the layup mechanism 2 mainly consists of a layup die 21 and a crank 22. The layup die 21 is used for the direct layup of parts, and the crank 22 is used to rotate the layup die 21 during part layup. The crank 22 and the layup die 21 are connected by an insert. A connecting shaft is provided through the middle of the layup die 21, and the two ends of the connecting shaft are rotatably connected to the mounting frame respectively; one end of the crank 22 is connected to the connecting shaft and is used to rotate the layup die 21.

[0017] To facilitate demolding after part placement, the placement mold 21 is designed as a combined structure. Specifically, the placement mold 21 includes a circular core mold and a placement ring 213, with the placement ring 213 fitted around the outer side of the circular core mold; the circular core mold consists of a central core mold 211 and side core molds 212 located on both sides of the central core mold 211, with adjacent side core molds 212 fixed together by connecting blocks 214; a connecting shaft is provided through the center of the central core mold 211.

[0018] like Figure 5 As shown, the intermediate core mold 211 and the two side core molds 212 are designed with an interlocking structure, allowing them to be combined into a complete circular core mold. The seam between the intermediate core mold 211 and the side core molds 212 is designed with a draft angle to facilitate removal of the core mold after layup. The intermediate core mold 211 and the side core molds 212 are positioned by four connecting blocks 214. The positioning method involves the square frustum on the connecting block 214 engaging with the square conical groove on the side core mold 212. Finally, four screws on each connecting block 214 are used to tighten the connecting block 214 onto the intermediate core mold 211 to achieve structural fastening. The layup ring 213 is installed on the assembled circular core mold. After the annular composite product parts are laid up, it is removed along with the parts for shaping, which solves the problem of preform deformation caused by traditional layup molds 21 when removing parts.

[0019] like Figure 2 and Figure 6 As shown, the clamping mechanism 1 is used to provide clamping force to the stacking mechanism 2 in real time during the part stacking process to ensure the compactness of the layup; the clamping mechanism 1 includes a rotating shaft 13, a pressure roller 11 and a pressure adjustment structure. The rotating shaft 13 is horizontally mounted on the mounting frame, and the pressure roller 11 is rotatably arranged in the middle of the rotating shaft 13 corresponding to the stacking mechanism 2. The two ends of the rotating shaft 13 extend out of the mounting frame and are connected to the mounting frame through the pressure adjustment structure.

[0020] Preferably, the pressure adjustment structure includes a spring 14, a pull rod 15, and a force adjustment nut 16. Mounting blocks 6 are respectively provided on both sides of the mounting bracket. A spring 14 is provided between the end of the rotating shaft 13 and the mounting block 6. One end of the pull rod 15 passes through the mounting block 6 and is connected to the spring 14. A force adjustment nut 16 is provided at the free end of the pull rod 15.

[0021] The clamping mechanism 1 is used to solve the problem of insufficient density when traditional ring-shaped composite parts are laid up. During part laying, the clamping mechanism 1 provides real-time clamping force to ensure the density of the layup. Simultaneously, the clamping mechanism 1 has a pressure adjustment function, allowing the clamping force to be adjusted according to the laying requirements. Specifically, the pressure roller 11 is mounted on the rotating shaft 13 via a bearing 12; the rotating shaft 13 can move up and down within a groove on the base 3; the spring 14 ensures that the pressure roller 11 continuously applies force during the laying process; the pull rod 15 and the force adjusting nut 16 are used to adjust the tension of the spring 14, thereby adjusting the pressure of the pressure roller 11.

[0022] The present invention includes the following steps in its use: (1) Assemble the mold before laying out the layers; 1) The intermediate core mold 211 and the two side core molds 212 are combined into a circular core mold by connecting block 214 and screws; 2) Place the layup ring 213 onto the circular core mold to form the layup mold 21; 3) Place the connecting shaft of the assembled layup mold 21 into the layup mounting slot 4 on the mounting frame; 4) Install the pressure roller 11 and the corresponding pressure adjustment structure; 5) Adjust the pressure of pressure roller 11 through the pressure regulating structure; 6) Place the strip prepreg between the layup die 21 and the pressure roller 11, and lay up the preform by rotating the layup die 21 with the handle.

[0023] (2) After the layering is completed, remove the mold; 1) Loosen the pressure adjusting nut 16 of the pressure adjusting mechanism to relieve the pressure on the pressure roller 11; 2) Remove the stacking mechanism 2 and the parts together from the base 3; 3) Remove the 4 connecting screws and 4 connecting blocks 214; 4) Remove the intermediate core mold 211; 5) Remove the two side core molds 212; 6) Remove the part together with the stacking ring 213.

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A layup mold for prepreg of ceramic matrix composite parts, characterized in that, The device includes a base (3), a mounting frame, a layup mechanism (2), and a pressing mechanism (1). The base (3) is provided with a mounting frame, and the pressing mechanism (1) and the layup mechanism (2) are rotatably arranged on the mounting frame from top to bottom. The pressing mechanism (1) is used to provide pressing force to the layup mechanism (2) in real time when the parts are laid up, so as to ensure the compactness of the layup. The pressing mechanism (1) includes a rotating shaft (13), a pressure roller (11), and a pressure adjustment structure. The rotating shaft (13) is installed horizontally on the mounting frame, and the middle part of the rotating shaft (13) is rotatably arranged with the pressure roller (11) corresponding to the layup mechanism (2). The two ends of the rotating shaft (13) extend out of the mounting frame and are connected to the mounting frame through the pressure adjustment structure.

2. The layup mold for prepreg of ceramic matrix composite parts according to claim 1, characterized in that, The pressure adjustment structure includes a spring (14), a pull rod (15), and a force adjustment nut (16). Mounting blocks (6) are respectively provided on both sides of the mounting bracket. A spring (14) is provided between the end of the rotating shaft (13) and the mounting block (6). One end of the pull rod (15) passes through the mounting block (6) and is connected to the spring (14). A force adjustment nut (16) is provided at the free end of the pull rod (15).

3. The layup mold for prepreg of ceramic matrix composite parts according to claim 1, characterized in that, The stacking mechanism (2) includes a stacking mold (21) and a rocker arm (22). A connecting shaft is provided through the middle of the stacking mold (21), and the two ends of the connecting shaft are rotatably connected to the mounting frame. One end of the rocker arm (22) is connected to the connecting shaft and is used to rotate the stacking mold (21).

4. The layup mold for prepreg of ceramic matrix composite parts according to claim 3, characterized in that, The layup mold (21) includes a circular core mold and a layup ring (213), and the layup ring (213) is sleeved on the outer side of the circular core mold; the circular core mold is composed of a middle core mold (211) and side core molds (212) located on both sides of the middle core mold (211), and adjacent side core molds (212) are fixed together by connecting blocks (214); a connecting shaft is provided through the middle of the middle core mold (211).

5. The layup mold for prepreg of ceramic matrix composite parts according to claim 4, characterized in that, The connecting block (214) has square cones at both ends, and the side core mold (212) has square cone grooves. The connecting block (214) has screws in the middle, which pass through the connecting block (214) and are fixedly connected to the middle core mold (211).

6. The layup mold for prepreg of ceramic matrix composite parts according to claim 4, characterized in that, The intermediate core mold (211) has a cross-shaped structure, and the inner side of the side core mold (212) is provided with a corresponding slot.

7. A layup mold for a ceramic matrix composite prepreg according to any one of claims 3 to 6, characterized in that, The mounting frame includes two parallel frames. The top of the frame is provided with a pressing mounting groove (5) along the Z direction, and the middle is provided with a top-opening stacking mounting groove (4). A rotating shaft (13) is installed between adjacent pressing mounting grooves (5), and a connecting shaft is rotatably installed between adjacent stacking mounting grooves (4).

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