A ring member forming die and method

Abstract

The application discloses a ring frame forming die and method, wherein the ring frame forming die comprises a die body and a pressing block assembly, the die body is provided with two intersecting forming grooves, the two forming grooves intersect to form an "8" shaped structure, both sides of the die body are provided with a sticking groove, the length direction of the sticking groove is parallel to the arrangement direction of the two forming grooves, and the two ends of the sticking groove are communicated with the two forming grooves respectively, the protrusions between the sticking groove and the two forming grooves are protruding blocks, and the pressing block assembly can extrude the prepreg in cooperation with the forming grooves and the sticking groove to realize the pre-pressing and curing of the ring frame. The ring frame forming method is implemented on the ring frame forming die, when the prepreg is laid, the fibers of the prepreg with different fiber angles are continuous at the specified area, the continuity of the prepreg layer and the accuracy of the fiber angle are ensured to the greatest extent, and the carrying capacity of the prepared ring frame is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of composite material load-bearing structure forming, and particularly relates to a ring frame forming die and method. BACKGROUND

[0002] To meet the increasing demand for lightweight of spacecraft, full-composite material load-bearing cabin sections are increasingly widely used. As a hoop member of the cabin section, a ring frame composite material structure is an important load-bearing mechanism, which can support the cabin section and diffuse concentrated load. A cabin section of a certain type of product comprises a 8-shaped ring frame, and a lay-up autoclave forming process is required for the forming process. The specific structure of the ring frame is shown in Figure 1

[0003] The ring frame composite material structure mainly bears bending and axial shear load, and bending failure is the main failure mode of the structure. Therefore, the design of the fiber direction determines the strength and performance of the structure during the manufacturing process.

[0004] The ring frame is prepared by the lay-up autoclave forming process. The pre-impregnated material of the product is stacked in the mold according to the design sequence and level, and then heat pressing and curing are performed.

[0005] However, the ring frame composite material structure has a non-developable curved surface. When laying the pre-impregnated material, the fiber angle changes with the structure form. That is, when laying the pre-impregnated material, the bending of the pre-impregnated material causes the fiber angle to deviate from the design direction, making it difficult to ensure that the fiber angle is consistent with the design direction at each layer during the lay-up process. Therefore, the fiber direction and distribution cannot be accurately controlled, which affects the mechanical properties of the part structure. SUMMARY

[0006] To solve the above technical problems, the application provides a ring frame forming die to solve the technical problem that the fiber angle is difficult to be consistent with the design direction at each layer during the lay-up process of the pre-impregnated material in the prior art, and thus the fiber angle and distribution cannot be accurately controlled.

[0007] The technical scheme adopted to achieve the purpose of the application is as follows:

[0008] A ring frame forming die comprises:

[0009] A mold body is used to carry the pre-impregnated material for preparing the ring frame. Two intersecting forming grooves are arranged on the mold body. The cross-sectional shape of the forming groove is circular. The two forming grooves intersect to form an "8" shape. A tacking groove is formed on each side of the mold body. The length direction of the tacking groove is parallel to the arrangement direction of the two forming grooves. The two ends of the tacking groove are in communication with the two forming grooves, respectively. The protrusion between the tacking groove and the two forming grooves is a protruding block.​

[0010] A pressing block assembly is used to press the prepreg in the forming groove and the attaching groove; when the prepreg is laid on the mold body, the pressing block assembly is assembled in the forming groove and the attaching groove to pre-press and shape the prepreg.

[0011] In order to better realize the present application, the top of the protruding block is provided with a sink, the sink is provided with a demolding block matched with the shape of the sink, the bottom of the mold body is provided with a demolding bolt, the bottom of the sink is provided with a threaded hole, and the abutting end of the demolding bolt can abut against the demolding block through the threaded hole.

[0012] In order to better realize the present application, the pressing block assembly comprises a first pressing block, a second pressing block and a profiled skin.

[0013] The number of the first pressing blocks is multiple, the multiple first pressing blocks are arranged along the circumference of the forming groove, and the side of the first pressing block away from the side wall of the forming groove is provided with a stress inclined surface, the upper edge of the stress inclined surface is connected with the top surface of the first pressing block, the lower edge of the stress inclined surface is connected with the bottom surface of the first pressing block, and the upper edge of the stress inclined surface is inclined to the extrusion surface of the first pressing block.

[0014] The side wall of the second pressing block is provided with an extrusion inclined surface matched with the stress inclined surface.

[0015] The profiled skin can be arranged along the circumference of the forming groove or the extension direction of the attaching groove, and can press the prepreg in cooperation with the side wall and the bottom wall of the forming groove or the side wall and the bottom wall of the attaching groove.

[0016] In order to better realize the present application, the second pressing block is provided with a locking piece, and the connecting end of the locking piece is connected with the mold body through the second pressing block.

[0017] The bottom of the forming groove is provided with a positioning protrusion, and the second pressing block is provided with a positioning hole matched with the positioning protrusion.

[0018] On the other hand, the present application provides a ring frame forming method, which is implemented by using the ring frame forming mold described above, and comprises the following steps:

[0019] Base laying, a grid cloth is laid on the mold body to form a bottom layer, and the bottom layer covers the forming groove, the protruding block and the attaching groove.

[0020] The bottom layer is formed by laying up the prepreg on the mold body, the prepreg is laid up on the bottom layer in different fiber angles, and the fibers of the prepreg in a specified area are continuous under different fiber angles; when the number of layers of the prepreg reaches a specified number, a pressing assembly is assembled in the forming groove and the attaching groove for pre-pressing;

[0021] Curing, when the number of layers of the prepreg reaches a designed number, a pressing assembly is assembled in the forming groove and the attaching groove for curing;

[0022] Demolding processing, the primary product after curing is taken out of the mold body, and the primary product is processed to obtain the ring frame.

[0023] In order to better realize the present application, in the above method, further optimization is made during the laying up, the prepreg is laid up on the bottom layer in fiber angles of 0°, 45°, 90° and -45° in turn, and the angle of the fiber direction is the included angle between the length direction of the fibers in the prepreg and the arrangement direction of the two forming grooves.

[0024] In order to better realize the present application, in the above method, further optimization is made, the forming groove is divided into A1 area, A2 area, A3 area, A4 area, A5 area and A6 area along the circumferential direction of the forming groove, the A1 area is located at one end of the two forming grooves away from each other, the A2 area, the A3 area, the A4 area, the A5 area and the A6 area are arranged in turn along the clockwise direction, the A4 area is located at the intersection side of the two forming grooves, and the two ends of the attaching groove are communicated with the A2 area and the A6 area of the two forming grooves respectively; the prepreg is laid up on the bottom layer in different fiber angles layer by layer, and the fibers of the prepreg in a specified area are continuous under different fiber angles.

[0025] When the prepreg with a fiber angle of 0° is laid up, the prepreg at the intersection of the upper end face of the convex block and the side wall of the forming groove and the intersection of the side wall of the forming groove and the bottom wall of the forming groove is continuous;

[0026] When the prepreg with a fiber angle of 45° and -45° is laid up, the prepreg is continuous at all positions needing to be folded;

[0027] When the prepreg with a fiber angle of 90° is laid up, the prepreg at the intersection of the upper end face of the convex block and the side wall of the attaching groove is continuous.

[0028] In order to better realize the present application, further optimization is made in the above method, and the two ends of the groove are respectively communicated with the A2 area and the A6 area of the two forming grooves;

[0029] Before the laying, a thickened layer is arranged in the A2 area and the A6 area, and one end of the thickened layer away from the A1 area can be butt-jointed with the pre-impregnated material laid in the forming groove and the pre-impregnated material laid in the groove; wherein the thickened layer is laid by 60 layers of pre-impregnated material, the fiber angles of the pre-impregnated material for laying the thickened layer are laid in turn at 0°, 45°, 90° and -45°, and the length of every 4 layers of pre-impregnated material decreases once, so that the thickness of one end of the thickened layer away from the A1 area is greater than the thickness of one end of the thickened layer close to the A1 area.

[0030] In order to better realize the present application, further optimization is made in the above method, and during the laying process, the pre-impregnated material is extruded in the forming groove and the groove by using the pressing block assembly once for normal temperature pre-pressing every 5 layers of the pre-impregnated material; during the normal temperature pre-pressing, the vacuum pressure is-0.09MPa~ -0.1MPa, and the pre-pressing time is 20min-30min;

[0031] When the 10th layer and the 35th layer are laid, the pre-impregnated material in the forming groove and the groove is extruded by using the pressing block assembly and is put into the oven for oven-vacuum pre-pressing; during the oven-vacuum pre-pressing, the vacuum pressure in the oven is-0.09MPa~ -0.1MPa, the pre-pressing temperature is 130±5℃, and the pre-pressing time is 2h;

[0032] When the number of layers reaches the designed number of layers, the pre-impregnated material in the forming groove and the groove is extruded by using the pressing block assembly and is put into the autoclave for autoclave-vacuum pre-pressing; during the autoclave-vacuum pre-pressing, the vacuum pressure in the autoclave is-0.09MPa~ -0.1MPa, the external pressure is 0.6MPa, the pre-pressing temperature is 130±5℃, and the pre-pressing time is 2h.

[0033] In order to better realize the present application, further optimization is made in the above method, and during the curing, the pre-impregnated material in the forming groove and the groove is extruded by using the pressing block assembly and is put into the curing tank for curing; the vacuum pressure in the curing tank is-0.09MPa~ -0.1MPa, and the external pressure is 0.6MPa; during the curing process, the temperature in the curing tank is adjusted according to the following steps:

[0034] The temperature in the curing tank is raised to 90℃ and maintained for 1h;

[0035] The temperature in the curing tank is raised to 180℃ and maintained for 3h;

[0036] The temperature in the curing tank is raised to 200℃ and maintained for 2h,

[0037] The temperature in the curing tank was raised to 240°C and maintained for 4 hours;

[0038] Remove the ring frame molding mold when the temperature in the curing tank naturally drops below 60°C.

[0039] As can be seen from the above technical solution, the ring frame forming mold and method provided in this application can ensure the continuity of the prepreg layer and the accuracy of the fiber angle to the greatest extent while ensuring the overall external dimensions of the ring frame, thereby improving the load-bearing capacity of the prepared ring frame. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the figure-eight-shaped ring frame described in the background art;

[0041] Figure 2 This is a structural schematic diagram of a ring frame forming mold provided in this application;

[0042] Figure 3 An exploded view of a ring frame forming mold provided in this application;

[0043] Figure 4 This application provides a schematic diagram of the structure of the mold body in a ring frame forming mold;

[0044] Figure 5 for Figure 4 A magnified view of a section at point C;

[0045] Figure 6 This is a schematic diagram of the pressure block assembly in a ring frame forming mold provided in this application.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1-Mold body, 11-Forming groove, 12-Attaching groove, 13-Protrusion, 131-Removable module;

[0048] 2-Pressure block assembly, 21-First pressure block, 22-Second pressure block, 23-Irregular skin. Detailed Implementation

[0049] To enable those skilled in the art to better understand this application, the technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] In the embodiments of this application, such as Figures 2 to 6 As shown, the ring frame forming mold includes a mold body 1 and a pressing block assembly 2; wherein,

[0051] The mold body 1 is used for carrying the prepreg for preparing a ring frame part, two intersecting forming grooves 11 are arranged on the mold body 1, the cross section of the forming groove 11 is circular, the two forming grooves 11 intersect to form an "8" shape structure, a pasting groove 12 is arranged on each side of the mold body 1, the length direction of the pasting groove 12 is parallel to the arrangement direction of the two forming grooves 11, and the two ends of the pasting groove 12 are communicated with the two forming grooves 11 respectively, so that the prepreg laid on the side wall of the pasting groove 12 can be butt jointed with the prepreg laid on the side wall of the forming groove 11, and the protrusions between the pasting groove 12 and the two forming grooves 11 are the protrusions 13;

[0052] The briquetting assembly 2 is used for extruding the prepreg in cooperation with the forming grooves 11 and the pasting grooves 12 to realize the shaping of the prepreg.

[0053] In some embodiments, the top of the protrusion 13 is provided with a recess, as shown in Figure 4 , the recess is provided with a demolding block 131 matched with the shape of the recess, the bottom of the mold body 1 is provided with a demolding bolt, the bottom of the recess is provided with a threaded hole, and the abutting end of the demolding bolt can abut against the demolding block 131 through the threaded hole;

[0054] After the curing of the prepreg is completed, the demolding bolt can be installed at the threaded hole, and the demolding bolt is tightened, so that the abutting end of the demolding bolt abuts against the demolding block 131, the demolding block 131 is pushed away from the recess, so as to push the initial product out of the mold body 1, and realize the demolding of the initial product.

[0055] It should be noted that when the prepreg is laid, the demolding block 131 is embedded in the recess, and the top surface of the demolding block 131 coincides with the top surface of the protrusion 13, so as to ensure that the prepreg can be laid flat on the top surface of the protrusion 13 and the demolding block 131.

[0056] In some embodiments, the above-mentioned briquetting assembly 2 includes a first briquetting block 21, a second briquetting block 22 and a profiled skin 23, as shown in Figure 6 ; wherein,

[0057] The number of the first briquetting blocks 21 is multiple, the multiple first briquetting blocks 21 are arranged along the circumference of the forming groove 11, and the side of the first briquetting block 21 away from the side wall of the forming groove 11 is provided with a stress inclined surface, the upper edge of the stress inclined surface is connected with the top surface of the first briquetting block 21, the lower edge of the stress inclined surface is connected with the bottom surface of the first briquetting block 21, the upper edge of the stress inclined surface is inclined to the extrusion surface of the first briquetting block 21, and the stress inclined surface is arranged on the two sides of the first briquetting block 21 opposite to the extrusion surface of the first briquetting block 21;

[0058] The side wall of the second pressing block 22 is provided with an extrusion slope matched with the stress slope. When the second pressing block 22 is extruded into the forming groove 11, the extrusion slope on the second pressing block 22 can cooperate with the stress slope on the first pressing block 21 to extrude the first pressing block 21 to the lower side of the forming groove 11, so that the extrusion surface and the bottom surface of the first pressing block 21 can cooperate with the side wall and the bottom wall of the forming groove 11 to extrude the prepreg, and the pre-pressing and curing of the ring frame part with the cross-sectional shape of the "L" shape are completed.

[0059] The profiled skin 23 can be arranged along the circumferential direction (not shown in the figure) of the forming groove 11 or the extension direction of the abutting groove 12, and can cooperate with the side wall of the forming groove 11 and the bottom wall of the forming groove 11 or the side wall of the abutting groove 12 and the bottom wall of the abutting groove 12 to extrude the prepreg.

[0060] In some embodiments, the second pressing block 22 is provided with a locking piece, and the connecting end of the locking piece passes through the second pressing block 22 and is connected with the mold body 1; wherein the locking piece is a bolt; when it is necessary to press the second pressing block 22, the locking piece can be connected with the mold body 1 through the second pressing block 22, and then the locking piece is tightened, so that the nut end of the locking piece can drive the second pressing block 22 to extrude into the forming groove 11; and when the locking piece is stopped, the locking piece can keep the position of the second pressing block 22, thereby providing stable extrusion force for the first pressing block 21.

[0061] The bottom of the forming groove 11 is provided with a positioning protrusion, and the second pressing block 22 is provided with a positioning hole matched with the positioning protrusion, so as to fix the moving direction of the second pressing block 22, thereby ensuring that the second pressing block 22 can simultaneously extrude the plurality of first pressing blocks 21 arranged along the circumferential direction of the forming groove 11 to the side wall of the forming groove 11.

[0062] Based on the above-mentioned ring frame part forming mold, the application further provides a ring frame part forming method, which is implemented by using the above-mentioned ring frame part forming mold, and the method comprises the following steps:

[0063] Bottoming, the grid cloth is laid on the mold body 1 to form a bottom layer, and the bottom layer covers the forming groove 11, the protrusion 13 and the abutting groove 12;

[0064] Laying, the grid cloth is folded and laid on the bottom layer at the intersection of the two forming grooves 11 to form a partition, so that the two forming grooves 11 are isolated from each other;

[0065] The forming groove 11 is provided with two thickened layers, the thickened layers extend from the side wall of the forming groove 11 away from the partition to the position where the forming groove 11 communicates with the two abutting grooves 12, and the two thickened layers are symmetrically arranged about the arrangement direction of the two forming grooves 11, see Figure 4 and Figure 5, and the thickness of the thickened layer near one end of the communication between the forming groove 11 and the attaching groove 12 is greater than the thickness of the thickened layer far from one end of the communication between the forming groove 11 and the attaching groove 12, so as to fill the defects (deformation) of the communication between the forming groove 11 and the attaching groove 12, and make the radius of the side wall of the forming groove 11, the side of the thickened layer away from the forming groove 11, and the partition equal;

[0066] The prepreg is laid on the bottom layer layer by layer with different fiber angles, and the fibers of the prepreg at the specified area are continuous under different fiber angles; when the number of the laid prepreg layers reaches the specified number, the compression block assembly 2 is assembled in the forming groove 11 and the attaching groove 12 for pre-pressing;

[0067] Curing, when the number of the laid prepreg layers reaches the designed number, the compression block assembly 2 is assembled in the forming groove 11 and the attaching groove 12 for curing;

[0068] Demolding processing, the demolding block 131 is used to take out the primary product after curing from the mold body 1, and the height, long axis flange thickness (the prepreg corresponding to the attaching groove 12) and inner circle size (the prepreg corresponding to the forming groove 11) of the primary product are processed to obtain the ring frame part.

[0069] In some embodiments, when laying, the prepreg is laid on the bottom layer layer by layer with fiber angles of 0°, 45°, 90° and -45° in turn, and the angle of the fiber direction is the included angle between the length direction of the fiber in the prepreg and the arrangement direction of the two forming grooves 11.

[0070] In some embodiments, the forming groove 11 is divided into A1 area, A2 area, A3 area, A4 area, A5 area and A6 area along the circumferential direction thereof, see Figure 4 The above-mentioned first compression block 21 is also provided with six in the A1 area, the A2 area, the A3 area, the A4 area, the A5 area and the A6 area, see Figure 2 The A1 area is located at one end where the two forming grooves 11 are away from each other, the A2 area, the A3 area, the A4 area, the A5 area and the A6 area are arranged and disposed in turn along the clockwise direction, the A4 area is located at the intersection side of the two forming grooves 11, the A2 area, the A3 area and the A5 area and the A6 area are symmetrically disposed about the arrangement direction of the two forming grooves 11, and the two ends of the attaching groove 12 are communicated with the A2 area and the A6 area of the two forming grooves 11 respectively;

[0071] The above-mentioned laying the prepreg layer by layer with different fiber angles on the bottom layer and ensuring the continuity of the fibers of the prepreg at the specified area under different fiber angles means that:

[0072] When laying the prepreg with a fiber angle of 0°, the prepreg at the intersection between the upper end surface of the protrusion 13 and the side wall of the forming groove 11 and the intersection between the side wall of the forming groove 11 and the bottom wall of the forming groove 11 is kept continuous;

[0073] When laying the prepreg with the fiber angle of 45° and -45°, the prepreg is kept continuous at all positions where folding is required, such as the upper end surface of the protrusion 13 and the side wall of the attaching groove 12, the upper end surface of the protrusion 13 and the side wall of the forming groove 11, and the side wall of the forming groove 11 and the bottom wall of the forming groove 11;

[0074] When laying the prepreg with the fiber angle of 90°, the prepreg at the joint of the upper end surface of the protrusion 13 and the side wall of the attaching groove 12 is kept continuous;

[0075] The gap between the two adjacent prepregs is controlled within 0-1mm, and the effective attachment of the prepregs is ensured during the laying process, without wrinkle or hollow part. If wrinkle or hollow part occurs, manual intervention is required, that is, the wrinkle or hollow part is cut open by a tool to make the wrinkle or hollow part flatly attached to the mold body 1. The fiber should not be cut during the processing to ensure the continuity of the prepreg.

[0076] It is worth noting that the above prepreg is in a strip structure, and when laying the prepreg with the fiber angle of 0°, 45°, -45° and 90°, a plurality of prepregs are laid in turn along the direction perpendicular to the limiting angle.

[0077] In some embodiments, the two ends of the attaching groove 12 are respectively communicated with the A2 area and the A6 area of the two forming grooves 11;

[0078] Before laying, a thickening layer is arranged in the A2 area and the A6 area, so that the end of the thickening layer away from the A1 area can be connected with the prepreg laid in the forming groove 11 and the prepreg laid in the attaching groove 12; wherein,

[0079] The thickening layer is laid by 60 layers of prepreg, the fiber angle of the prepreg for laying the thickening layer is laid in turn at 0°, 45°, 90° and -45°, and the length of every 4 layers of prepreg decreases once, so that the thickness of the end of the thickening layer away from the A1 area is greater than the thickness of the end of the thickening layer close to the A1 area. The thicker end of the thickening layer can connect the prepreg at the attaching groove 12, so as to ensure the stability of the structure of the formed ring frame.

[0080] In some embodiments, during the laying process, the profiled skin 23 is used to extrude in the forming groove 11 and the attaching groove 12 once for normal temperature pre-pressing after laying 5 layers of prepreg; during the normal temperature pre-pressing, the vacuum pressure is -0.09MPa to -0.1MPa, and the pre-pressing time is 20min-30min;

[0081] and when laying the 10th layer and the 35th layer, the first pressing block 21 and the second pressing block 22 are used to press the prepreg in the forming groove 11 and put into the oven for oven-vacuum pre-pressing; when oven-vacuum pre-pressing, the vacuum pressure in the oven is -0.09MPa to -0.1MPa, the pre-pressing temperature is 130±5℃, and the pre-pressing time is 2h;

[0082] When the number of layers reaches the designed number of layers, the first pressing block 21 and the second pressing block 22 are used to press the prepreg in the forming groove 11 and put into the autoclave for autoclave-vacuum pre-pressing; when autoclave-vacuum pre-pressing, the vacuum pressure in the autoclave is -0.09MPa to -0.1MPa, the outer pressure pressure is 0.6MPa, the pre-pressing temperature is 130±5℃, and the pre-pressing time is 2h.

[0083] In some embodiments, when curing, the A4 area uses the first pressing block 21, and the prepreg in the other areas of the forming groove 11 and the sticking groove 12 uses the random skin 23 to press the prepreg and put into the curing tank for curing; the vacuum pressure in the curing tank is -0.09MPa to -0.1MPa, and the outer pressure pressure is 0.6MPa; during the curing process, the temperature in the curing tank is adjusted according to the following steps:

[0084] The temperature in the curing tank is raised to 90℃ and maintained for 1h;

[0085] The temperature in the curing tank is raised to 180℃ and maintained for 3h;

[0086] The temperature in the curing tank is raised to 200℃ and maintained for 2h,

[0087] The temperature in the curing tank is raised to 240℃ and maintained for 4h;

[0088] When the temperature in the curing tank naturally drops to below 60℃, the ring frame forming mold is taken out.

[0089] Through the above embodiments, the present application has the following beneficial effects or advantages:

[0090] The ring frame forming mold and method can ensure the continuity of the prepreg layers and the accuracy of the fiber angle to the greatest extent under the condition of ensuring the overall shape size of the ring frame, so as to improve the carrying capacity of the prepared ring frame.

[0091] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to the embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0092] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A ring member forming die characterized by comprising: The application relates to a ring frame forming die, which comprises the following parts: a die body (1) for carrying a prepreg used for preparing the ring frame, two intersecting forming grooves (11) arranged on the die body (1), the cross section of the forming grooves (11) is circular, the two forming grooves (11) intersect to form a "8" structure, a sticking groove (12) is arranged on each side of the die body (1), the length direction of the sticking groove (12) is parallel to the arrangement direction of the two forming grooves (11), the two ends of the sticking groove (12) are communicated with the two forming grooves (11) respectively, and a convex block (13) is arranged between the sticking groove (12) and the two forming grooves (11); and a pressing block assembly (2) used for pressing the prepreg in cooperation with the forming grooves (11) and the sticking groove (12). The prepreg is pre-pressed and shaped when the pressing block assembly (2) is attached to the side wall of the forming groove (11), the bottom wall of the forming groove (11), the side wall of the sticking groove (12) and the bottom wall of the sticking groove (12). The pressing block assembly (2) comprises a first pressing block (21), a second pressing block (22) and a profiled skin (23). The first pressing block (21) is arranged along the circumferential direction of the forming groove (11), and a stress inclined surface is arranged on the side of the first pressing block (21) away from the side wall of the forming groove (11), the upper edge of the stress inclined surface is connected with the top surface of the first pressing block (21), the lower edge of the stress inclined surface is connected with the bottom surface of the first pressing block (21), and the upper edge of the stress inclined surface is inclined to the pressing surface of the first pressing block (21). The side wall of the second pressing block (22) is provided with a pressing inclined surface matched with the stress inclined surface. The profiled skin (23) can be arranged along the circumferential direction of the forming groove (11) or the extension direction of the sticking groove (12), and can press the prepreg in cooperation with the side wall of the forming groove (11), the bottom wall of the forming groove (11), the side wall of the sticking groove (12) and the bottom wall of the sticking groove (12). The top of the convex block (13) is provided with a sinking groove, the sinking groove is provided with a demolding block (131) matched with the shape of the sinking groove, the bottom of the die body (1) is provided with a demolding bolt, the bottom of the sinking groove is provided with a threaded hole, and the abutting end of the demolding bolt can abut against the demolding block (131) through the threaded hole.

2. The ring frame forming mold of claim 1, wherein, The second pressing block (22) is provided with a locking piece, the connecting end of the locking piece passes through the second pressing block (22) and is connected with the die body (1).

3. The ring frame forming mold of claim 1 wherein, The bottom of the forming groove (11) is provided with a positioning convex block, and the second pressing block (22) is provided with a positioning hole matched with the positioning convex block. The method is implemented by using the ring frame forming die in any one of the preceding embodiments, and comprises the following steps:

4. A method of forming a ring frame member, characterized by, A bottom layer is formed on the die body (1) by using a mesh cloth, and the bottom layer covers the forming grooves (11), the convex block (13) and the sticking groove (12). ​ The bottom layer is formed by laying up the prepreg on the mold body (1) in a certain order, and the prepreg is laid up on the bottom layer in a certain order to form a certain fiber angle, and the fiber angle is 0°, 45°, 90°, and-45° in sequence; the fiber angle is the angle between the length direction of the fiber in the prepreg and the arrangement direction of the two forming grooves (11); the two forming grooves (11) are isolated from each other by a partition formed by folding the grid cloth and laying it on the bottom layer at the intersection of the two forming grooves (11); two thickened layers are arranged in the forming groove (11), the thickened layer extends from the side wall of the forming groove (11) away from the partition to the position where the forming groove (11) is communicated with the two sticking grooves (12), the two thickened layers are symmetrically arranged about the arrangement direction of the two forming grooves (11), and the thickness of one end of the thickened layer close to the communication position of the forming groove (11) and the sticking groove (12) is greater than the thickness of the other end of the thickened layer away from the communication position of the forming groove (11) and the sticking groove (12); the prepreg is laid up on the bottom layer layer by layer at different fiber angles, and the fiber of the prepreg at the specified area is continuous under different fiber angles; when the number of layers of the prepreg reaches the specified number of layers, the pre-pressing assembly (2) is assembled in the forming groove (11) and the sticking groove (12) for pre-pressing; Curing, when the number of layers of the prepreg reaches the designed number of layers, the pre-pressing assembly (2) is assembled in the forming groove (11) and the sticking groove (12) for curing; Demolding processing, the primary product after curing is taken out of the mold body (1), and the primary product is processed to obtain a ring frame part.

5. The ring frame forming method of claim 4, wherein, During the laying up, the prepreg is laid up on the bottom layer in the order of fiber angles of 0°, 45°, 90°, and-45°, and the fiber angle is the angle between the length direction of the fiber in the prepreg and the arrangement direction of the two forming grooves (11).

6. The ring frame forming method of claim 5, wherein, The forming groove (11) is divided into A1 area, A2 area, A3 area, A4 area, A5 area and A6 area along the circumferential direction of the forming groove (11), the A1 area is located at one end of the two forming grooves (11) away from each other, the A2 area, the A3 area, the A4 area, the A5 area and the A6 area are arranged in sequence along the clockwise direction, the A4 area is located at the intersection side of the two forming grooves (11), and the two ends of the sticking groove (12) are communicated with the A2 area and the A6 area of the two forming grooves (11) respectively; the prepreg is laid up on the bottom layer layer by layer at different fiber angles, and the fiber of the prepreg at the specified area is continuous under different fiber angles, which means that: When the prepreg with a fiber angle of 0° is laid up, the prepreg at the intersection of the upper end surface of the protrusion (13) and the side wall of the forming groove (11) and the intersection of the side wall of the forming groove (11) and the bottom wall of the forming groove (11) is continuous; When the prepreg with a fiber angle of 45° and-45° is laid up, the prepreg is continuous at all positions that need to be folded; When the prepreg with a fiber angle of 90° is laid up, the prepreg at the intersection of the upper end surface of the protrusion (13) and the side wall of the sticking groove (12) is continuous.

7. The ring frame forming method of claim 6 wherein, The two ends of the sticking groove (12) are communicated with the A2 area and the A6 area of the two forming grooves (11) respectively; Before laying, set up thickening layer in A2 area and A6 area, so that the end of the thickening layer away from A1 area can be connected with the pre-impregnated material laid in forming groove (11) and the pre-impregnated material laid in sticking groove (12); wherein the thickening layer is made of 60 layers of pre-impregnated material, the fiber angle of the pre-impregnated material laid for the thickening layer is laid in turn at 0°, 45°, 90° and -45°, and the length of every 4 layers of pre-impregnated material decreases once, so that the thickness of the end of the thickening layer away from the A1 area is greater than the thickness of the end of the thickening layer close to the A1 area.

8. The ring frame forming method of claim 4, wherein, During the laying process, the pre-impregnated material is extruded in the forming groove (11) and the sticking groove (12) by the pressing block assembly (2) once for normal temperature pre-pressing every 5 layers of pre-impregnated material laid; during the normal temperature pre-pressing, the vacuum pressure is -0.09MPa~ -0.1MPa, and the pre-pressing time is 20min-30min; When the 10th layer and the 35th layer are laid, the pre-impregnated material in the forming groove (11) and the sticking groove (12) is extruded by the pressing block assembly (2) and put into the oven for oven-vacuum pre-pressing; during the oven-vacuum pre-pressing, the vacuum pressure in the oven is -0.09Mpa~ -0.1Mpa, the pre-pressing temperature is 130±5℃, and the pre-pressing time is 2h; When the number of layers reaches the designed number of layers, the pre-impregnated material in the forming groove (11) and the sticking groove (12) is extruded by the pressing block assembly (2) and put into the autoclave for autoclave-vacuum pre-pressing; during the autoclave-vacuum pre-pressing, the vacuum pressure in the autoclave is -0.09MPa~ -0.1MPa, the external pressure is 0.6Mpa, the pre-pressing temperature is 130±5℃, and the pre-pressing time is 2h.

9. The ring frame forming method of claim 4, wherein, During the curing, the pre-impregnated material in the forming groove (11) and the sticking groove (12) is extruded by the pressing block assembly (2) and put into the curing tank for curing; the vacuum pressure in the curing tank is -0.09MPa~ -0.1MPa, and the external pressure is 0.6Mpa; during the curing process, the temperature in the curing tank is adjusted according to the following steps: Increase the temperature in the curing tank to 90℃ and maintain for 1h; Increase the temperature in the curing tank to 180℃ and maintain for 3h; Increase the temperature in the curing tank to 200℃ and maintain for 2h, Increase the temperature in the curing tank to 240℃ and maintain for 4h; Take out the ring frame part forming mold when the temperature in the curing tank naturally decreases to below 60℃.

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