Radial pressing mold for composite material test sample and molding method

Abstract

The application discloses a kind of composite sample radial pressing mould and forming method, it is related to material forming mould technical field, composite sample radial pressing mould includes outer mould shell;Several outer round sliders, each outer round slider is located in the inner cavity of outer mould shell, and it is evenly arranged around its axis, and the two ends of each outer round slider abut each other, to form the first expansion cavity around;Several expansion sliders, each expansion slider is located in the first expansion cavity, each expansion slider is in abutment with the side wall of adjacent outer round slider, and the end of each expansion slider close to the axis of outer mould shell is provided with sliding groove, and each sliding groove is connected to form the second expansion cavity;Mold core slider, to extend into the second expansion cavity, so that mold core slider holds each expansion slider, the present application solves the technical problems that the cost of existing prepreg forming mould is higher, the process is complex, or the pressure transmission is uneven during pressing process, resulting in uneven prepreg winding density and poor resin combination, affecting the quality of heat-cured product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material forming mold, in particular to a composite material sample radial pressing mold and a forming method. BACKGROUND

[0002] In the forming process of composite materials, winding process is a widely used method, which principle is to wrap the continuous fibers soaked in thermosetting resin on the mold core, and then to cure under high temperature and high pressure environment, so as to obtain the required composite product. In this process, the pressure application mode of the curing stage plays a decisive role in the distribution of the internal fibers of the material and the performance of the final product. However, the current composite curing and pressing method has many shortcomings, for example, the autoclave process can realize uniform pressing of the winding sample, but the sample packaging and pressing curing process of the autoclave process is complex, and the use cost of the equipment is high. In most cases, the pressing direction of the mold pressing process is single, mainly axial pressing for cylindrical samples, which is difficult to realize the full range and uniform pressure application of the composite material, thereby reducing the stability and reliability of the product quality.

[0003] In summary, it is urgent for the person skilled in the art to develop a radial pressing mold with low cost and uniform pressure application to the material fibers. SUMMARY

[0004] The purpose of the present application is to provide a composite material sample radial pressing mold and a forming method, which solves the technical problems of high cost or single pressure direction of the existing material curing method, and cannot uniformly press the material in all directions.

[0005] To achieve the above purpose, the present application provides a composite material sample radial pressing mold, comprising:

[0006] An outer mold shell;

[0007] A plurality of outer circular sliding blocks, each outer circular sliding block is arranged in the inner cavity of the outer mold shell and is uniformly arranged around the axis of the outer mold shell, and the two ends of each outer circular sliding block abut each other to form a first expansion cavity;

[0008] A plurality of expansion sliding blocks, each expansion sliding block is arranged in the first expansion cavity, each expansion sliding block abuts against the side wall of the adjacent outer circular sliding block, and each expansion sliding block is provided with a sliding groove at one end close to the axis of the outer mold shell, and the sliding grooves are connected to form a second expansion cavity;

[0009] A mold core sliding block is arranged above the outer mold shell, and the contour outer diameter of the mold core sliding block is increased at one end away from the outer mold shell, the mold core sliding block is inserted into the second expansion cavity, and the mold core sliding block holds each expansion sliding block.

[0010] Preferably, the core slider comprises a plurality of expansion plates, each expansion plate is connected to each other along the length direction side, each adjacent expansion plate has the same angle, and the width of the expansion plate is tapered towards the end close to the second expansion cavity.

[0011] Preferably, the extension direction of the sliding groove is parallel to the axis of the outer mold shell, and the groove depth of the sliding groove is tapered in the direction away from the core slider, so that the bottom surface of the sliding groove corresponds to the inclined side wall of the core slider.

[0012] Preferably, the side wall of each outer round slider close to the axis of the outer mold shell is V-shaped, and each expansion slider is wedge-shaped, and the width of the expansion slider is tapered towards the end away from the axis of the outer mold shell.

[0013] Preferably, the side wall of the outer round slider and the expansion slider away from the axis of the outer mold shell is arc-shaped, when the core slider extends into the second expansion cavity, the side wall of the outer round slider is supported by the expansion slider, and after the expansion of the outer round slider, the arc-shaped surface is located on the same circle.

[0014] Preferably, the outer round slider, the expansion plate and the expansion slider are three.

[0015] Preferably, the outer round slider is provided with an upper baffle and a lower baffle at both ends, the upper baffle and the lower baffle form a winding groove on the side wall of each outer round slider, the winding groove is used to limit the winding range of the prepreg, and each outer round slider is fixed with the upper baffle and the lower baffle through fasteners.

[0016] Preferably, the upper baffle is provided with a clearance hole corresponding to the second expansion cavity, and the diameter of the clearance hole is greater than the maximum outer diameter of the core slider, and the lower baffle is provided with a butt joint hole for clamping the tapered end of the core slider.

[0017] Preferably, the inner wall of the outer mold shell is provided with a first buckle for fixing the upper baffle and a second buckle for fixing the lower baffle.

[0018] A composite material annular sample forming method is applied to the composite material sample radial pressing mold, comprising:

[0019] The upper baffle and the lower baffle are fixed on both sides of the outer round slider through fasteners, and abut against both ends of each outer round slider to form a winding groove;

[0020] The continuous fibers are fully impregnated into the thermosetting resin, and the continuous fibers are completely wrapped by the resin to generate a prepreg, the prepreg is wound into the winding groove, and a winding tension of 10 to 50 N is applied to the prepreg during winding, and the prepreg is wound for 10 to 100 layers.

[0021] The outer circular slider is arranged in the inner cavity of the outer mold shell. When the upper baffle and the lower baffle are clamped with the inner wall of the outer mold shell, the fasteners are removed, the mold core slider extends into the second expansion cavity through the clearance hole, each expansion slider slides in the first expansion cavity, each expansion slider slides along the side wall of the outer circular slider while applying a radial thrust to the outer circular slider, each outer circular slider applies pressure to the prepreg on the outer side during the expansion process, and the prepreg is heated at a temperature of 150-200 DEG C for 1-4 hours while being pressurized, so that the prepreg is high-temperature cured.

[0022] The heat source is turned off, the prepreg is cooled, and the cured annular sample is taken out of the outer mold shell.

[0023] With respect to the above background technology, the composite material annular sample forming method provided by the present application comprises an outer mold shell, the inner cavity of the outer mold shell is provided with a plurality of outer circular sliders, each outer circular slider is arranged around the axis of the outer membrane shell, the two ends of each outer circular slider abut each other, and the side wall of each outer circular slider close to the axis of the outer mold shell is surrounded to form a first expansion cavity. An expansion slider equal to the outer circular slider is arranged in the inner cavity of the first expansion body, the expansion slider abuts against the side wall of the adjacent outer circular slider, and one end of each expansion slider close to the outer mold shell is provided with a sliding groove. The sliding grooves are butted to form a second expansion cavity, the second expansion cavity is used for butting the mold core slider, and the contour outer diameter of the one end of the mold core slider away from the outer mold shell is increased. After a plurality of layers of prepreg are wound on the outer periphery of each outer circular slider, the outer circular slider is arranged in the inner cavity of the outer mold shell, the mold core slider is inserted into the second expansion cavity, and the mold core slider with gradually expanding contour outer diameter supports each expansion slider in the process of being inserted into the sliding groove, so that each expansion slider applies a thrust to each outer circular slider, and each outer circular slider applies a tension to the prepreg wound on the outer side.

[0024] The present application provides that the structures of each expansion slider are consistent, the structures of each outer circular slider are also consistent, the abutting conditions of each expansion slider and each outer circular slider are the same, the mold core slider supports the outer circular slider through the expansion slider, the component forces of the mold core slider to each expansion slider are equal, the outer circular slider can uniformly press the prepreg on the outer side, and the structure of the annular sample after thermal curing is stable and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0026] Figure 1 The first structure diagram of the expansion state of the composite material sample radial pressure mold provided by the embodiments of the present application;

[0027] Figure 2 The second structural diagram of the radial pressure mold of the composite sample provided by the embodiment of the present application in the expanded state;

[0028] Figure 3 The structural diagram of the radial pressure mold of the composite sample provided by the embodiment of the present application in the contracted state;

[0029] Figure 4 The structural diagram of the expansion sliding block provided by the embodiment of the present application;

[0030] Figure 5 The structural diagram of the mold core sliding block provided by the embodiment of the present application;

[0031] Figure 6 The structural diagram of the upper baffle provided by the embodiment of the present application;

[0032] Figure 7 The structural diagram of the lower baffle provided by the embodiment of the present application.

[0033] 1-outer round sliding block; 2-expansion sliding block; 21-sliding groove; 3-mold core sliding block; 31-expansion plate; 4-upper baffle; 41-give way hole; 5-lower baffle; 51-butting hole. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0035] In order for those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0036] The present application provides a radial pressure mold of a composite sample, please refer to the structural diagram of the radial pressure mold of the composite sample provided by the embodiment of the present application in the expanded state Figures 1 to 3The application comprises an outer mold shell (not shown in the figure), a plurality of outer circular sliders 1 are arranged in the inner cavity of the outer mold shell, the outer circular sliders 1 are uniformly distributed around the axis of the outer mold shell, and the two ends of each outer circular slider 1 abut against each other, so that the side walls of the outer circular sliders 1 close to the axis of the outer mold shell jointly form a first expansion cavity, expansion sliders 2 are arranged inside the first expansion cavity, each expansion slider 2 is located in the included angle formed by adjacent outer circular sliders 1, the end faces on both sides of the expansion slider 2 are tightly attached to the side walls of the outer circular sliders 1 on both sides, and the expansion slider 2 can slide relative to the side walls of the outer circular sliders 1, a sliding groove 21 is arranged at one end of each expansion slider 2 close to the outer mold shell, and the sliding grooves 21 are butted against each other to form a second expansion cavity, and further, a mold core slider 3 is arranged above the outer circular sliders 1, and the outer contour diameter of the mold core slider 3 gradually decreases towards one end close to the outer circular sliders 1.

[0037] When the composite material is subjected to radial pressure operation by the application, a specified number of prepreg layers are wound around the outer periphery of the outer circular slider 1, the outer circular slider 1 is placed in the inner cavity of the outer mold shell, the mold core slider 3 arranged above the outer mold shell corresponds to the second expansion cavity, and the operator applies pressure to the mold core slider 3 through a hydraulic machine, so that the mold core slider 3 extends into the second expansion cavity, and since the outer diameter of the mold core slider 3 gradually increases away from the outer mold shell, that is, as the mold core slider 3 gradually extends into the second expansion cavity, the diameter of the mold core slider 3 abutting against each sliding groove 21 gradually increases, so that each expansion slider 2 moves away from the axis of the mold core slider 3, and correspondingly, each expansion slider 2 holds each outer circular slider 1 arranged on its outer periphery, so that the cavity of the first expansion cavity increases, the outer periphery contour formed by the outer circular sliders 1 increases, and the outer circular sliders 1 are tightly expanded in the prepreg, through this process, the outer circular sliders 1 and the expansion sliders 2 abutting against each other and relatively sliding can convert the axial pressure into uniform radial pressure, the pressure on the prepreg meets the standard and is uniform, and the annular sample produced after heat curing has higher strength.

[0038] Please refer to the drawings in the description Figure 5, the plurality of expansion plates 31 are connected to each other along the length direction, and the connected side edges are overlapped with each other, the width of each expansion plate 31 is tapered towards the end close to the outer mold shell, so that the side wall on the side away from the connection part of each expansion plate 31 is inclined, at this time, the profile of the mold core sliding block 3 is conical, in addition, the included angle between each adjacent expansion plate 31 is equal, and the number of the expansion sliding blocks 2 arranged in the first expansion cavity is equal to the number of the expansion plates 31, each expansion sliding block 2 is uniformly distributed around the axis of the outer mold shell, and each expansion sliding block 2 is provided with a sliding groove 21 at the end close to the outer mold shell, the port of the sliding groove 21 corresponds to the mold core sliding block 3, preferably, each expansion sliding block 2 is uniformly distributed around the axis of the outer mold shell, that is, the included angle of each adjacent sliding groove 21 is equal, the number of the expansion sliding blocks 2 is equal to the number of the expansion plates 31, and each is uniformly distributed around the axis of the outer mold shell, so the included angle of adjacent expansion plates 31 is equal to the included angle of adjacent sliding grooves 21, when the mold core sliding block 3 is butted to the second expansion cavity, each expansion plate 31 can be accurately butted to each sliding groove 21, in addition, the included angle of each sliding groove 21 is equal, when the mold core sliding block 3 is inserted into the second expansion cavity, the thrust exerted by the mold core sliding block 3 on each expansion sliding block 2 is uniformly directed to the side away from the axis of the outer mold shell, the expansion sliding block 2 uniformly exerts pressure on the pre-impregnated material through the outer circular sliding block 1, and the structure of the annular sample after hot curing and molding is more stable.

[0039] Preferably, the number of each expansion plate 31, expansion sliding block 2 and outer circular sliding block 1 is three, so that the cross section of the second expansion cavity and the mold core sliding block 3 is Y-shaped, further, please refer to the drawings Figure 4 The wall surface of each sliding groove 21 opposite to the axis of the outer mold shell is referred to as the abutting surface, the length direction of the sliding groove 21 is parallel to the axis of the outer mold shell, the groove depth of the sliding groove 21 is gradually shallower along the direction of insertion of the mold core sliding block 3, preferably, at the end of the sliding groove 21 away from the mold core sliding block 3, the abutting surface here is flush with the port of the sliding groove 21, that is, each sliding groove 21 is inclined, and each abutting surface corresponds to the side wall of the expansion plate 31.

[0040] Further, the side wall of each outer round slider 1 near the axis of the outer mold shell is V-shaped, that is, the first expansion cavity is surrounded by three sector plates, and each adjacent side wall of the adjacent sector plates clamps an expansion slider 2. Preferably, the expansion slider 2 is wedge-shaped, and the width thereof gradually decreases away from the axis of the outer mold shell. The side wall of each expansion slider 2 abuts against the inclined surface of the outer round slider 1. After the mold core slider 3 is inserted into the second expansion cavity, the mold core slider 3 abuts against the abutment surface of the outer side wall and the sliding groove 21. The operator applies pressure to the mold core slider 3 through the hydraulic machine. The mold core slider 3 gradually extends into the second expansion cavity, and slides along the abutment surface of the sliding groove 21. The width of each expansion plate 31 extending into the second expansion cavity increases, and the expansion plate 31 pushes the expansion slider 2 to move away from the axis of the outer mold shell. Since each expansion slider 2 is wedge-shaped, when the expansion slider 2 slides between the expansion slider 2 and the outer round slider 1, the first expansion cavity is opened, and each outer round slider 1 applies pressure to the pre-impregnated material wrapped therearound. It should be noted that when the outer round slider 1 with the V-shaped side wall is supported by the expansion slider 2, the pushing force is symmetrical about the symmetry axis of the outer round slider 1, so that the moment of each outer round slider 1 along the arc chord direction is balanced, and the force applied to each outer round slider 1 uniformly points to the outer periphery of the outer mold shell. Thus, the outer round slider 1 applies pressure to the pre-impregnated material while ensuring stable arrangement of the outer round slider 1.

[0041] Please see the accompanying drawings Figure 1 with the accompanying drawings Figure 2 , the outer peripheral side wall of each outer round slider 1 and each expansion slider 2 is a curved arc surface. Preferably, the arc chord length corresponding to the curved arc surface of the outer round slider 1 is greater than the arc chord length of the curved arc surface of the expansion slider 2. When the mold core slider 3 is fully inserted into the second expansion cavity, the curved arc surface of each mold core slider 3 is on the same graduated circle as the curved arc surface of the outer round slider 1, so that the expansion slider 2 fills the gap of each outer round slider 1, and the complete cylindrical surface formed by the expansion slider 2 and the outer periphery of the outer round slider 1 can uniformly apply pressure to the pre-impregnated material. Preferably, the diameter of the graduated circle is slightly smaller than the inner diameter of the outer mold shell, so that the outer round slider 1 can still be placed in the outer mold shell after wrapping a certain number of layers of pre-impregnated material. In addition, when the outer round slider 1 expands the pre-impregnated material, the outer side of the pre-impregnated material abuts against the inner wall of the outer mold shell, and the outer mold shell and the outer round slider 1 clamp the pre-impregnated material, so that the pre-impregnated material is subjected to a specified pressure while ensuring stable shape of the pre-impregnated material.

[0042] Please see the accompanying drawings Figure 6 with the accompanying drawings Figure 7The upper baffle plate 4 and the lower baffle plate 5 are vertically provided with fasteners, the upper baffle plate 4 and the lower baffle plate 5 are fixed with the outer circular sliding blocks 1, the length of the prepreg after winding is limited, and the prepreg is prevented from being extruded and deformed after the outer circular sliding blocks 1 are expanded, so that the shape of the annular sample after heat curing is inconsistent with the target shape.

[0043] In addition, the upper baffle plate 4 is provided with a clearance hole 41 corresponding to the second expansion cavity, the diameter of the clearance hole 41 is greater than the maximum outer diameter of the mold core sliding block 3, so that the mold core sliding block 3 can be completely inserted into the outer mold shell, the mold core sliding block 3 can fully expand the outer circular sliding blocks 1, and the lower baffle plate 5 is provided with a butt joint hole 51 for clamping the tapered end of the mold core sliding block 3 passing through the second expansion cavity; further, the inner wall of the outer mold shell is provided with a first buckle and a second buckle, which are respectively used for clamping the upper baffle plate 4 and the lower baffle plate 5.

[0044] In an embodiment of the present application, each expansion plate 31 is connected to a pressure-sensitive element of a pressure sensor, the pressure-sensitive element is used to collect the pushing force signal of the mold core sliding block 3 to the outer circular sliding block 1 in real time, and the pressure received by the prepreg can be monitored through the calculation of the control unit, and the pressure applied by the mold core sliding block 3 is adjusted according to the monitored pressure, so that the pressure received by the prepreg is kept within a preset range.

[0045] The application also provides a composite annular sample forming method applied to the composite sample radial pressure mold, and the method comprises the following steps:

[0046] In the mold assembly stage, the V-shaped side walls of the outer circular sliding blocks 1 are opposite to each other, the two ends of the outer circular sliding blocks 1 abut against each other, the outer circular sliding blocks 1 surround to form a first expansion cavity, then the expansion sliding blocks 2 are arranged in the first expansion cavity, at this time, the outer circular sliding blocks 1 surround to form a structure with an outer periphery approximating to a cylinder, then the upper baffle plate 4 and the lower baffle plate 5 are fixed on the two sides of the outer circular sliding blocks 1 by fasteners, and the upper baffle plate 4 and the lower baffle plate 5 abut against the two ends of the outer circular sliding blocks 1 to form a winding groove;

[0047] In the winding stage, a certain length of continuous fibers are fully soaked in thermosetting resin, the continuous fibers are completely wrapped by the resin to generate a prepreg, the prepreg is uniformly wound into the winding groove, and a winding tension of 10-50 N is applied to the prepreg during the winding process to ensure that the structure of the prepreg after winding is compact, and preferably, the number of layers of the prepreg that can be wound ranges from 10 to 100 layers.

[0048] In the pressurizing and curing stage, the outer circular slide block 1 is arranged in the inner cavity of the outer mold shell, when the upper baffle 4 and the lower baffle 5 are clamped with the inner wall of the outer mold shell, the fasteners are removed, the mold core slide block 3 extends into the second expansion cavity through the clearance hole 41, each expansion slide block 2 slides in the first expansion cavity, each expansion slide block 2 slides along the side wall of the outer circular slide block 1 and simultaneously applies a radial thrust force to the outer circular slide block 1, each outer circular slide block 1 applies pressure to the prepreg on the outer side during the expansion process, and at the same time, the prepreg is heated at a temperature of 150-200℃ for 1-4 hours to make the prepreg high-temperature curing;

[0049] In the cooling and demolding stage, the heat source is turned off and the prepreg is cooled, and at the same time, the pressure applied by the prepreg to the outer circular slide block 1 is monitored through the pressure-sensitive element, when the pressure decreases to zero, it indicates that the heat curing of the prepreg is completed and the annular sample structure is stable, after the outer mold shell, the upper baffle 4 and the lower baffle 5 are removed, the cured annular sample can be taken out from the outer circular slide block 1, and the annular sample production is completed.

[0050] It should be noted that in the present specification, the relationship terms such as first and second are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between the entities.

[0051] The principles and implementation modes of the present application are described by applying specific examples in the present specification, and the above description of the examples is only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A composite specimen radial press mold characterized by, The application relates to a kind of outer shell and outer round slider, which comprises: An outer shell; A plurality of outer round sliders are arranged in the inner cavity of the outer shell, and are uniformly arranged around the axis of the outer shell, and the two ends of each outer round slider abut each other to form a first expansion cavity; A plurality of expansion sliders are arranged in the first expansion cavity, and the side wall of each expansion slider abuts against the adjacent outer round slider, and the end of each expansion slider close to the axis of the outer shell is provided with a sliding groove, and the sliding grooves are connected to form a second expansion cavity; A mold core slider is arranged above the outer shell, and the profile of the mold core slider is increased at the end away from the outer shell, so that the mold core slider is inserted into the second expansion cavity, and the mold core slider holds each expansion slider.

2. The composite specimen radial press tooling of claim 1, wherein, The mold core slider comprises a plurality of expansion plates, the side edges of each expansion plate are connected to each other along the length direction, the included angle of each adjacent expansion plate is the same, and the width of the expansion plate gradually decreases towards the end close to the second expansion cavity.

3. The composite specimen radial press tooling of claim 2, wherein, The extension direction of the sliding groove is parallel to the axis of the outer shell, and the groove depth of the sliding groove gradually decreases in the direction away from the mold core slider, so that the bottom surface of the sliding groove corresponds to the inclined side wall of the mold core slider.

4. The composite specimen radial press tooling of claim 2, wherein, The side wall of each outer round slider close to the axis of the outer shell is V-shaped, and each expansion slider is wedge-shaped, and the width of the expansion slider gradually decreases towards the end away from the axis of the outer shell.

5. The composite specimen radial press tooling of claim 4, wherein, The side wall of the outer round slider and the expansion slider away from the axis of the outer shell is arc-shaped, when the mold core slider is inserted into the second expansion cavity, the side wall of each expansion slider holds the outer round slider, and after the expansion of each outer round slider, the arc surfaces are located on the same circle.

6. The composite specimen radial press tooling of claim 5, wherein, The outer round slider, the expansion plate and the expansion slider are each three.

7. The composite specimen radial press tooling of claim 5, wherein, The two ends of the outer round slider are respectively provided with an upper baffle and a lower baffle, the upper baffle and the lower baffle form a winding groove on the side wall of each outer round slider, the winding groove is used to limit the winding range of the prepreg, and each outer round slider is fixed by fasteners.

8. The composite specimen radial press tooling of claim 7, wherein, The upper baffle is provided with a clearance hole corresponding to the second expansion cavity, the diameter of the clearance hole is greater than the maximum profile diameter of the mold core slider, the lower baffle is provided with a butt joint hole for clamping the tapered end of the mold core slider.

9. The composite specimen radial press tooling of claim 7, wherein, The inner wall of the outer shell is provided with a first buckle for fixing the upper baffle and a second buckle for fixing the lower baffle.

10. A method of molding a composite annular test specimen, comprising: The application is applied to the radial pressure mold of the composite material sample as claimed in claim 8, comprising: The upper baffle (4) and the lower baffle (5) are fixed on both sides of the outer circular slider (1) through the fasteners, and abut against both ends of each outer circular slider (1) to form the wire slot; The continuous fibers are fully impregnated into the thermosetting resin, and the continuous fibers are completely wrapped by the resin to generate the prepreg, the prepreg is wound into the wire slot, and a winding tension of 10-50 N is applied to the prepreg during the winding process, and the prepreg is wound for 10-100 layers; The outer circular slider (1) is arranged in the inner cavity of the outer mold shell, after the upper baffle (4) and the lower baffle (5) are clamped with the inner wall of the outer mold shell, the fasteners are removed, the mold core slider (3) extends into the second expansion cavity through the accommodation hole (41), each expansion slider (2) slides in the first expansion cavity, each expansion slider (2) applies a radial pushing force to the outer circular slider (1) while sliding along the side wall of the outer circular slider (1), and each outer circular slider (1) applies pressure to the prepreg on the outer side during the expansion process, and the prepreg is heated at a temperature in the range of 150-200℃ for 1-4 hours while being pressurized, so that the prepreg is high-temperature cured; The heat source is turned off, the prepreg is cooled, and the cured annular sample is taken out of the outer mold shell.

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