A forming die for a composite hoop T-stiffener and a method of manufacture thereof

Abstract

The application provides a forming die of a composite material circumferential T-shaped reinforcing frame and a preparation method thereof, and relates to the technical field of aircraft accessory forming tools. The forming die of the composite material circumferential T-shaped reinforcing frame comprises a lower die plate, a pressing plate assembly, a side pressing movable block assembly and an upper die plate. The inner side surface of the lower die plate is provided with a first forming pressing groove, and the first forming pressing groove is provided with a first forming protruding frame. The pressing plate assembly is connected with the first forming protruding frame. The side pressing movable block assembly is connected in the first forming pressing groove. The inner side surface of the upper die plate is provided with a second forming protruding frame, the second forming protruding frame is connected with the first forming pressing groove, and the second forming protruding frame is sleeved with the outside of the side pressing movable block assembly. The technical problem of poor bearing capacity of the product, high manufacturing cost and long production cycle after the existing die is processed is solved. The die of the application combines the lower die plate, the pressing plate assembly, the side pressing movable block assembly and the upper die plate, and the bearing capacity of the product after forming is strong, and the processing efficiency of the product is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aircraft accessory forming tooling, in particular to a composite material annular T-shaped reinforcing frame forming die and a preparation method thereof. BACKGROUND

[0002] Space vehicles are developing towards large size and light weight, which promotes the wide application of composite materials with high specific strength and high specific stiffness. The composite material annular T-shaped reinforcing frame is a main component part of the rocket cabin section, which plays a supporting and connecting role and is an integrally formed part with high structural efficiency.

[0003] In the above prior art, when the composite material annular T-shaped reinforcing frame is manufactured, a single-sided die hot press tank or vacuum bag hot press forming is mainly used.

[0004] During processing, the fibers inside the product are easily damaged, reducing the load-carrying capacity of the product. The overall manufacturing cost of the product is high. After the product is formed, the profile precision of the assembly surface is low; secondary processing is required, the production cycle of the product is long, and the processing efficiency is low. SUMMARY

[0005] The present application aims to provide a composite material annular T-shaped reinforcing frame forming die to solve the technical problems in the prior art that the composite material annular T-shaped reinforcing frame is formed by a single-sided die hot press tank or vacuum bag hot press forming, the load-carrying capacity of the product is poor, the manufacturing cost is high, the profile precision of the assembly surface is low after the product is formed; secondary processing is required, resulting in a long production cycle and low processing efficiency of the product.

[0006] The present application also provides a preparation method of a composite material annular T-shaped reinforcing frame to solve the technical problems in the prior art that the production cycle is long and the processing efficiency is low.

[0007] The present application provides a composite material annular T-shaped reinforcing frame forming die, which comprises a lower die plate, a pressing plate assembly, a side pressing movable block assembly and an upper die plate.

[0008] The inner side surface of the lower die plate is provided with a first forming pressing groove, and a first forming protruding frame is arranged in the first forming pressing groove.

[0009] The pressing plate assembly is connected to the first forming protruding frame.

[0010] The side pressing movable block assembly is a square hollow structure, and is connected to the first forming pressing groove and is sleeved outside the pressing plate assembly.

[0011] The inner side surface of the upper die plate is provided with a second forming protruding frame, and the second forming protruding frame is connected to the first forming pressing groove and is sleeved outside the side pressing movable block assembly.

[0012] Further, the pressing plate assembly comprises a middle connecting plate, a top pressing block, a bottom pressing block, a left upper pressing block, a left middle pressing block, a left lower pressing block, a right upper pressing block, a right middle pressing block and a right lower pressing block;

[0013] The top pressing block and the bottom pressing block are respectively connected to the top end and the bottom end of the middle connecting plate;

[0014] The left upper pressing block, the left middle pressing block and the left lower pressing block are sequentially connected to the left side of the middle connecting plate, and the left upper pressing block and the left lower pressing block are respectively connected to the left side of the top pressing block and the bottom pressing block, so that the left pressing plate mold is formed;

[0015] The right upper pressing block, the right middle pressing block and the right lower pressing block are sequentially connected to the right side of the middle connecting plate, and the right upper pressing block and the right lower pressing block are respectively connected to the right side of the top pressing block and the bottom pressing block, so that the right pressing plate mold is formed.

[0016] Further, the side pressing movable block assembly comprises a left upper end movable block, a left upper movable block, a left lower movable block, a left lower end movable block, a right upper end movable block, a right upper movable block, a right lower movable block and a right lower end movable block;

[0017] The left upper end movable block, the left upper movable block, the left lower movable block and the left lower end movable block are sequentially connected, so that the left pressing movable block mold is formed;

[0018] The right upper end movable block, the right upper movable block, the right lower movable block and the right lower end movable block are sequentially connected, so that the right pressing movable block mold is formed;

[0019] The inner side end of the left upper end movable block is connected to the inner side end of the right upper end movable block, and the inner side end of the left lower end movable block is connected to the inner side end of the right lower end movable block.

[0020] Further, the second forming pressing groove is arranged in the first forming protruding frame;

[0021] The inner side surface of the pressing plate assembly is provided with a third forming protruding frame;

[0022] The third forming protruding frame is connected to the second forming pressing groove.

[0023] Further, the second forming pressing groove is provided with a first forming pressing block;

[0024] The third forming protruding frame is provided with a fourth square protruding frame;

[0025] The first forming pressing block is connected to the fourth square protruding frame.

[0026] Further, the first forming pressing block is provided with a third forming pressing groove;

[0027] The fourth square protruding frame is provided with a second forming pressing block;

[0028] The second forming block is connected with the third forming groove.

[0029] Further, the inner side of the side pressing movable block assembly is provided with a first strip-shaped pressing block.

[0030] The bottom of the side pressing movable block assembly is provided with a second strip-shaped pressing block.

[0031] Further, the cross section of the side pressing movable block assembly is tapered from narrow top to wide bottom.

[0032] The application provides a preparation method of a composite material annular T-shaped reinforcing frame, comprising the following steps:

[0033] Step one: mold preparation

[0034] Clean the mold, and apply release agent on the surface of the lower mold plate, the pressing plate assembly, the side pressing movable block assembly and the upper mold plate respectively;

[0035] The intermediate connecting plate, the top pressing block, the bottom pressing block, the left upper pressing block, the left intermediate pressing block, the left lower pressing block, the right upper pressing block, the right intermediate pressing block and the right lower pressing block are sequentially connected by the connecting piece, and after connection, the pressing plate assembly is formed;

[0036] Step two: blanking

[0037] According to the size and the layering sequence of the annular T-shaped reinforcing frame, the carbon fiber epoxy unidirectional prepreg is cut and blanked;

[0038] Step three: first layering

[0039] On the surface of the above pressing plate assembly, taking the product length direction as the 0° direction, the surface of the above pressing plate assembly is sequentially layered with carbon fiber epoxy unidirectional prepreg webs in the sequence of 45°, -45°, 0° and 90° in cycles; when the prepreg is laid, the air brought in between the layers is squeezed out; when the butt joint layering is performed, the butt joint seams of each layer are staggered;

[0040] On the surface of the above lower mold plate, taking the product length direction as the 0° direction, the surface of the above lower mold plate is sequentially layered with carbon fiber epoxy unidirectional prepreg webs in the sequence of 45°, -45°, 0° and 90° in cycles; when the prepreg is laid, the air brought in between the layers is squeezed out; when the butt joint layering is performed, the butt joint seams of each layer are staggered;

[0041] Step four: assembly

[0042] The pressing plate assembly is connected on the first forming protruding frame of the lower mold plate along the first forming groove;

[0043] Step five: second layering

[0044] After the assembly of the mold, the edge of the assembled mold is taken as the 0° direction, and the 45°, -45°, 0°, 90° sequence is adopted in turn to perform the carbon fiber epoxy unidirectional prepreg edge plate layering on the surface of the mold; when the prepreg is laid, the air brought in between the layers is extruded; when the butt joint layering is performed, the butt joint seams of each layer are staggered;

[0045] Step six: compaction

[0046] The left upper end movable block, the left upper movable block, the left lower movable block, the left lower end movable block, the right upper end movable block, the right upper movable block, the right lower movable block, and the right lower end movable block are sequentially placed in the grooves of the lower mold plate according to the marks, to form a side pressure movable block assembly;

[0047] The side pressure movable block assembly is connected in the first forming pressure groove of the lower mold plate; then the upper mold plate is pressed on the top of the side pressure movable block assembly and is connected and fixed with the lower mold plate by using the connecting piece;

[0048] After the connection is completed, the mold is placed in a hot press, and pre-compaction is performed according to the compaction schedule;

[0049] Step seven: trimming

[0050] After the mold is completed, the carbon fiber epoxy unidirectional prepreg is used to repair the defects on the surface of the product;

[0051] Step eight: third layering

[0052] After the assembly of the mold, the edge of the assembled mold is taken as the 0° direction, and the -45°, 45° sequence is adopted in turn to perform the carbon fiber epoxy unidirectional prepreg edge plate layering on the surface of the mold; when the prepreg is laid, the air brought in between the layers is extruded; when the butt joint layering is performed, the butt joint seams of each layer are staggered;

[0053] Step nine: curing

[0054] After the layering is completed, the upper mold plate is connected to the lower mold plate by using the connecting piece to assemble and mold;

[0055] Then the mold is placed in a hot press, and curing is performed according to the curing schedule;

[0056] Step ten: demolding

[0057] The upper mold plate is disassembled by using the reverse jack bolt; then the side pressure movable block assembly is taken out; and then the movable block assembly together with the product is demolded from the lower mold plate by using the reverse jack bolt;

[0058] The connecting piece on the pressure plate assembly is disassembled, and the parts on the pressure plate assembly are taken out in turn;

[0059] At this time, the composite material circumferential T-shaped reinforcing frame can be obtained.

[0060] The application provides a forming die for a composite material annular T-shaped reinforcing frame.

[0061] The first forming pressing groove is arranged on the inner side surface of the lower die plate, and the first forming protruding frame is arranged in the first forming pressing groove; the pressing plate assembly is connected to the first forming protruding frame to compact and fix the surface of the product. The side pressing movable block assembly adopts a square hollow structure to cooperate with the pressing plate assembly. The side pressing movable block assembly is connected to the first forming pressing groove and is sleeved outside the pressing plate assembly to compact and fix the side surface of the product. The inner side surface of the upper die plate is provided with the second forming protruding frame, the second forming protruding frame is connected to the first forming pressing groove and is sleeved outside the side pressing movable block assembly, and the upper die plate is used to reinforce the pressing plate assembly and the side pressing movable block assembly again, so that the load-bearing capacity of the product after forming is high, the profile precision of the assembly surface is high, the product does not need to be processed again after forming, the processing efficiency is improved, the production cycle of the product is shortened, and the manufacturing cost of the product is low.

[0062] The application provides a preparation method of a composite material annular T-shaped reinforcing frame, which comprises the following steps: mold preparation, blanking, first-time layering, assembling, second-time layering, compacting, trimming, third-time layering, curing and demolding in sequence, so that the production cycle of the product is shortened and the processing efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0063] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0064] Figure 1 An exploded state schematic view of the forming die for the composite material annular T-shaped reinforcing frame is provided for the embodiments of the application.

[0065] Figure 2 A use state schematic view of the forming die for the composite material annular T-shaped reinforcing frame is provided for the embodiments of the application.

[0066] Figure 3 An internal structure schematic view of the lower die plate is provided for the embodiments of the application.

[0067] Figure 4 A schematic view of the pressing plate assembly is provided for the embodiments of the application.

[0068] Figure 5 An exploded state schematic view of the pressing plate assembly is provided for the embodiments of the application.

[0069] Figure 6 An internal structure diagram of the pressing plate assembly provided for the embodiment of the present application;

[0070] Figure 7 A schematic diagram of the side pressing movable block assembly provided for the embodiment of the present application;

[0071] Figure 8 A schematic diagram of the side pressing movable block assembly provided for the embodiment of the present application in an exploded state;

[0072] Figure 9 An internal structure diagram of the side pressing movable block assembly provided for the embodiment of the present application;

[0073] Figure 10 An internal structure diagram of the upper mold plate provided for the embodiment of the present application;

[0074] Figure 11 A flowchart of a preparation method of the composite material annular T-shaped reinforcing frame provided for the embodiment of the present application;

[0075] Figure 12 A structure schematic diagram of the composite material annular T-shaped reinforcing frame provided for the embodiment of the present application.

[0076] Icon:

[0077] 100 - lower mold plate; 200 - pressing plate assembly; 300 - side pressing movable block assembly; 400 - upper mold plate; 500 - composite material annular T-shaped reinforcing frame;

[0078] 101 - first forming pressing groove; 102 - first forming protruding frame; 103 - second forming pressing groove; 104 - first forming pressing block; 105 - third forming pressing groove;

[0079] 201 - middle connecting plate; 202 - top pressing block; 203 - bottom pressing block; 204 - left upper pressing block; 205 - left middle pressing block; 206 - left lower pressing block; 207 - right upper pressing block; 208 - right middle pressing block; 209 - right lower pressing block; 210 - third forming protruding frame; 211 - fourth square protruding frame; 212 - second forming pressing block;

[0080] 301 - left upper end movable block; 302 - left upper movable block; 303 - left lower movable block; 304 - left lower end movable block; 305 - right upper end movable block; 306 - right upper movable block; 307 - right lower movable block; 308 - right lower end movable block; 309 - first strip pressing block; 310 - second strip pressing block; 401 - second forming protruding frame. DETAILED DESCRIPTION

[0081] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. 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 other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0082] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0083] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0084] As shown in Figures 1-10 , the present embodiment provides a forming die for a composite material circumferential T-shaped reinforcing frame, which is made of steel material to ensure the structural strength of the whole die.

[0085] Referring to Figure 1 , Figure 2 , the forming die comprises, from bottom to top, a lower die plate 100, a pressing plate assembly 200, a side pressing movable block assembly 300 and an upper die plate 400;

[0086] Referring to Figure 3 , the inner side surface of the lower die plate 100 is provided with a first forming pressing groove 101, and the first forming pressing groove 101 is provided with a first forming protruding frame 102. The first forming pressing groove 101 is a square groove, and the first forming protruding frame 102 is a square protruding frame.

[0087] The pressing plate assembly 200 is connected to the first forming protruding frame 102 by screws;

[0088] Referring to Figure 7The side pressing movable block assembly 300 is a square hollow structure. The side pressing movable block assembly 300 is connected into the first forming pressing groove 101 by screws and is sleeved outside the pressing plate assembly 200 to provide a lateral force for the pressing plate assembly 200.

[0089] With reference to Figure 10 The inner side of the upper die plate 400 is provided with a second forming protruding frame 401 which is connected into the first forming pressing groove 101 by screws and is sleeved outside the side pressing movable block assembly 300 to lock the position of the side pressing movable block assembly 300.

[0090] In the above embodiment, the cooperation of the lower die plate 100, the pressing plate assembly 200, the side pressing movable block assembly 300 and the upper die plate 400 enables the overall annular T-shaped reinforcing frame to be formed in a hot press tank, thereby ensuring the profile accuracy of the assembly surface of the annular T-shaped reinforcing frame. The mold is simple to operate and does not need secondary processing. The production cycle of the product is short, the production efficiency of the product is improved, and the manufacturing cost is low. After the product is formed, it has strong carrying capacity, accurate positioning, and high profile accuracy of the assembly surface.

[0091] With reference to Figure 4 、 Figure 5 The pressing plate assembly 200 comprises a middle connecting plate 201, a top end pressing block 202, a bottom end pressing block 203, a left side upper pressing block 204, a left side middle pressing block 205, a left side lower pressing block 206, a right side upper pressing block 207, a right side middle pressing block 208 and a right side lower pressing block 209.

[0092] The top end pressing block 202 and the bottom end pressing block 203 are respectively connected to the top end and the bottom end of the middle connecting plate 201 by screws.

[0093] The left side upper pressing block 204, the left side middle pressing block 205 and the left side lower pressing block 206 are sequentially connected to the left side of the middle connecting plate 201 by screws. The left side upper pressing block 204 and the left side lower pressing block 206 are respectively connected to the left side of the top end pressing block 202 and the bottom end pressing block 203 by screws to form a left side pressing plate mold.

[0094] The right side upper pressing block 207, the right side middle pressing block 208 and the right side lower pressing block 209 are sequentially connected to the right side of the middle connecting plate 201 by screws. The right side upper pressing block 207 and the right side lower pressing block 209 are respectively connected to the right side of the top end pressing block 202 and the bottom end pressing block 203 by screws to form a right side pressing plate mold. The pressing plate assembly 200 provides a top pressing force for the product by the eight pressing blocks connected by screws to ensure the product forming.

[0095] With reference to Figure 7 、 Figure 8The side pressing movable block assembly 300 comprises a left upper end movable block 301, a left upper movable block 302, a left lower movable block 303, a left lower end movable block 304, a right upper end movable block 305, a right upper movable block 306, a right lower movable block 307, and a right lower end movable block 308.

[0096] The left upper end movable block 301, the left upper movable block 302, the left lower movable block 303, and the left lower end movable block 304 are sequentially connected by screws to form a left side pressing movable block mold.

[0097] The right upper end movable block 305, the right upper movable block 306, the right lower movable block 307, and the right lower end movable block 308 are sequentially connected by screws to form a right side pressing movable block mold.

[0098] The inner side end of the left upper end movable block 301 is connected to the inner side end of the right upper end movable block 305 by a screw, and the inner side end of the left lower end movable block 304 is connected to the inner side end of the right lower end movable block 308 by a screw. The side pressing movable block assembly 300 is connected by the above eight movable blocks through screws to provide lateral pressure to the product and ensure the lateral forming effect of the product.

[0099] Referring to Figure 3 , Figure 6 In the above embodiment, the first forming protruding frame 102 is internally provided with a second forming pressing groove 103, and the second forming pressing groove 103 is a square groove.

[0100] The inner side surface of the pressing plate assembly 200 is provided with a third forming protruding frame 210, and the third forming protruding frame 210 is a square protruding frame.

[0101] The third forming protruding frame 210 is fixedly connected to the second forming pressing groove 103 by a screw to press and fix the top of the lower mold plate 100 and ensure the forming of the product surface.

[0102] Referring to Figure 3 , Figure 6 In the above embodiment, the second forming pressing groove 103 is internally provided with a first forming pressing block 104, and the first forming pressing block 104 is a rectangular block.

[0103] The third forming protruding frame 210 is internally provided with a fourth square protruding frame 211, and the fourth square protruding frame 211 is a square protruding frame.

[0104] The first forming pressing block 104 is fixedly connected to the fourth square protruding frame 211 by a screw to press and fix the top of the lower mold plate 100 again and ensure the forming of the product surface.

[0105] Referring to Figure 3 , Figure 6In the above embodiment, the first forming block 104 is internally provided with a third forming groove 105; the third forming groove 105 is a rectangular groove.

[0106] The fourth square protruding frame 211 is internally provided with a second forming block 212; the second forming block 212 is a rectangular protruding block.

[0107] The second forming block 212 and the third forming groove 105 are fixedly connected by screws, and the top center position of the lower die plate 100 is press-fitted and fixed to ensure the center position of the product surface to be formed.

[0108] Referring to Figure 9 In the above embodiment, the inner side of the side pressing movable block assembly 300 is provided with a first strip-shaped pressing block 309; the number of the first strip-shaped pressing block 309 is multiple, and the multiple first strip-shaped pressing blocks 309 are press-fitted and fixed to the side of the pressing plate assembly 200.

[0109] The bottom of the side pressing movable block assembly 300 is provided with a second strip-shaped pressing block 310, and the number of the second strip-shaped pressing block 310 is multiple; the multiple second strip-shaped pressing blocks 310 are tightly pressed in the first forming groove 101, and the bottom of the side pressing movable block assembly 300 is tightly fixed.

[0110] Referring to Figure 1 , Figure 9 In the above embodiment, the cross section of the side pressing movable block assembly 300 is tapered, which is narrow at the top and wide at the bottom. The tapered surface is sleeved on the outside of the pressing plate assembly 200 to ensure the pressing force of the side of the pressing plate assembly 200.

[0111] As shown in Figure 11 A preparation method of a composite material circumferential T-shaped reinforcing frame, comprising the following steps:

[0112] Step 1: mold preparation

[0113] Clean the mold, and apply release agent to the surface of the lower die plate 100, the pressing plate assembly 200, the side pressing movable block assembly 300 and the upper die plate 400 three times respectively;

[0114] The intermediate connecting plate 201, the top pressing block 202, the bottom pressing block 203, the left upper pressing block 204, the left middle pressing block 205, the left lower pressing block 206, the right upper pressing block 207, the right middle pressing block 208 and the right lower pressing block 209 are connected in sequence by connecting pieces, and after connection, the pressing plate assembly 200 is formed;

[0115] The connecting piece is a pin and a screw;

[0116] Step 2: blanking

[0117] According to the size and the layering sequence of the annular T-shaped reinforcing frame, the carbon fiber epoxy unidirectional prepreg is cut and fed by using an automatic feeding machine;

[0118] Step three: first layering

[0119] On the surface of the pressing plate assembly 200, with the product length direction as the 0° direction, the surface of the pressing plate assembly 200 is sequentially layered with carbon fiber epoxy unidirectional prepreg webs in the sequence of 45°, -45°, 0°, 90° cycle; when the prepreg is laid, compaction is preferably ensured, and air brought in between layers is squeezed out by using an electric iron or a pressing plate; when butt joint layering is performed, butt joints of each layer are staggered;

[0120] On the surface of the lower mold plate 100, with the product length direction as the 0° direction, the surface of the lower mold plate 100 is sequentially layered with carbon fiber epoxy unidirectional prepreg webs in the sequence of 45°, -45°, 0°, 90° cycle; when the prepreg is laid, compaction is preferably ensured, and air brought in between layers is squeezed out by using an electric iron or a pressing plate; when butt joint layering is performed, butt joints of each layer are staggered;

[0121] Step four: assembly

[0122] Referring to Figure 1 , the pressing plate assembly 200 is connected to the first forming protruding frame 102 of the lower mold plate 100 along the first forming pressing groove 101;

[0123] Step five: second layering

[0124] On the edge of the assembled mold, with the annular direction of the assembled mold as the 0° direction, the surface of the assembled mold is sequentially layered with carbon fiber epoxy unidirectional prepreg webs in the sequence of 45°, -45°, 0°, 90° cycle; when the prepreg is laid, compaction is preferably ensured, and air brought in between layers is squeezed out by using an electric iron or a pressing plate; when butt joint layering is performed, butt joints of each layer are staggered;

[0125] Step six: compaction

[0126] The left upper end movable block 301, the left upper movable block 302, the left lower movable block 303, the left lower end movable block 304, the right upper end movable block 305, the right upper movable block 306, the right lower movable block 307, and the right lower end movable block 308 are sequentially placed in the grooves of the lower mold plate 100 according to the marks to form the side pressing movable block assembly 300;

[0127] The movable blocks have a movable amount before positioning, and provide lateral pressure in the sliding process.

[0128] Referring to Figure 1The side pressure movable block assembly 300 is connected in the first forming pressure groove 101 of the lower mold plate 100 and is sleeved on the outside of the pressure plate assembly 200;

[0129] The upper mold plate 400 is pressed on the top of the side pressure movable block assembly 300 and is connected and fixed with the lower mold plate 100 by using the connecting piece;

[0130] The connecting piece is a screw;

[0131] After the connection is completed, the mold is placed in a hot press, and pre-compaction is performed according to a compaction system; the compaction system is 120°C / 0.5h, and then the pressure is increased to 2MPa;

[0132] Step seven: trimming

[0133] After the mold is pre-pressed, carbon fiber epoxy unidirectional prepreg is used to repair defects on the surface of the product; the defect types include: wrinkles, pits, protrusions and the like;

[0134] Step eight: third layering

[0135] At the edge of the assembled mold, the above-mentioned assembled mold is taken as the 0° direction, and the surface of the above-mentioned assembled mold is sequentially layered with carbon fiber epoxy unidirectional prepreg rim plates in the order of -45°, 45° cycle; when the prepreg is laid, compaction is preferably ensured, and air brought in between the layers is squeezed out by using an electric iron or a pressing plate; when the butt joint layering is performed, each layer is offset from the butt joint seam;

[0136] Step nine: curing

[0137] After the layering is completed, the product is assembled and molded by using the connecting piece to connect the above-mentioned upper mold plate 400 to the lower mold plate 100 according to the Figure 1 The connecting piece is a pin or a screw;

[0138] Then the mold is placed in a hot press, and curing is performed according to a curing system; the curing system is 120°C / 0.5h, and then the pressure is increased to 3MPa, 180°C / 3h;

[0139] Step ten: demolding

[0140] The upper mold plate 400 is disassembled by using a reverse jack bolt; then the side pressure movable block assembly 300 is taken out; and then the pressure block assembly 200 is demolded from the lower mold plate 100 together with the product by using a reverse jack bolt;

[0141] The connecting piece on the pressure plate assembly 200 is disassembled, and each part on the pressure plate assembly 200 is taken out in sequence; the connecting piece is a screw and a pin extractor;

[0142] As shown in Figure 12 At this time, the composite circumferential T-shaped reinforcing frame 500 can be obtained.

[0143] The application provides a preparation method of a composite material ring T-shaped reinforcing frame, which integrates the whole ring T-shaped reinforcing frame into a hot press tank for integrated molding, and the operation method is simple; the profile precision of the assembly surface of the ring T-shaped reinforcing frame is improved after the product is molded; the product has high bearing capacity, accurate positioning, and improved production efficiency.

[0144] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A forming die for a composite hoop T-stiffener, characterised in that, It comprises a lower die plate (100), a pressing plate assembly (200), a side pressing movable block assembly (300) and an upper die plate (400); The inner side of the lower die plate (100) is provided with a first forming pressing groove (101), and the first forming pressing groove (101) is provided with a first forming protruding frame (102) inside; The pressing plate assembly (200) is connected to the first forming protruding frame (102); The side pressing movable block assembly (300) is a square hollow structure, which is connected to the first forming pressing groove (101) and is sleeved outside the pressing plate assembly (200); The inner side of the upper die plate (400) is provided with a second forming protruding frame (401), which is connected to the first forming pressing groove (101) and is sleeved outside the side pressing movable block assembly (300); The pressing plate assembly (200) comprises an intermediate connecting plate (201), a top pressing block (202), a bottom pressing block (203), a left upper pressing block (204), a left middle pressing block (205), a left lower pressing block (206), a right upper pressing block (207), a right middle pressing block (208) and a right lower pressing block (209); The top pressing block (202) and the bottom pressing block (203) are respectively connected to the top end and the bottom end of the intermediate connecting plate (201); The left upper pressing block (204), the left middle pressing block (205) and the left lower pressing block (206) are sequentially connected to the left side of the intermediate connecting plate (201), and the left upper pressing block (204) and the left lower pressing block (206) are respectively connected to the left side of the top pressing block (202) and the bottom pressing block (203), so that the left side pressing plate mold is formed; The right upper pressing block (207), the right middle pressing block (208) and the right lower pressing block (209) are sequentially connected to the right side of the intermediate connecting plate (201), and the right upper pressing block (207) and the right lower pressing block (209) are respectively connected to the right side of the top pressing block (202) and the bottom pressing block (203), so that the right side pressing plate mold is formed.

2. The forming die for a composite material hoop T-stiffener according to claim 1, characterized in that, The side pressing movable block assembly (300) comprises a left upper end movable block (301), a left upper movable block (302), a left lower movable block (303), a left lower end movable block (304), a right upper end movable block (305), a right upper movable block (306), a right lower movable block (307) and a right lower end movable block (308); The left upper end movable block (301), the left upper movable block (302) and the left lower movable block (303) are sequentially connected, so that the left side pressing movable block mold is formed; The right upper end movable block (305), the right upper movable block (306) and the right lower movable block (307) are sequentially connected, so that the right side pressing movable block mold is formed; The inner side end of the left upper end movable block (301) is connected to the inner side end of the right upper end movable block (305), and the inner side end of the left lower end movable block (304) is connected to the inner side end of the right lower end movable block (308).

3. The forming die for a composite material hoop T-stiffener according to claim 2, characterized in that, The first shaped protruding frame (102) is internally provided with a second shaped pressing groove (103); The inner side of the pressing plate assembly (200) is provided with a third shaped protruding frame (210); The third shaped protruding frame (210) is connected with the second shaped pressing groove (103).

4. The forming mold of a composite material hoop T-stiffener according to claim 3, characterized in that, The second shaped pressing groove (103) is internally provided with a first shaped pressing block (104); The third shaped protruding frame (210) is internally provided with a fourth square protruding frame (211); The first shaped pressing block (104) is connected with the fourth square protruding frame (211).

5. A forming die for a composite material hoop T-stiffener according to claim 4, wherein, The first shaped pressing block (104) is internally provided with a third shaped pressing groove (105); The fourth square protruding frame (211) is internally provided with a second shaped pressing block (212); The second shaped pressing block (212) is connected with the third shaped pressing groove (105).

6. A forming die for a composite material hoop T-stiffener according to claim 5, wherein, The inner side of the side pressing movable block assembly (300) is provided with a first strip-shaped pressing block (309); The bottom of the side pressing movable block assembly (300) is provided with a second strip-shaped pressing block (310).

7. A forming die for a composite material hoop T-stiffener according to claim 6, wherein, The cross section of the side pressing movable block assembly (300) is conical with the upper part being narrow and the lower part being wide.

8. A method of making a composite hoop T-stiffener, characterized by, The method comprises the following steps: Step one: mold preparation Clean the mold, and apply release agent to the surface of the lower mold plate (100), the pressing plate assembly (200), the side pressing movable block assembly (300), and the upper mold plate (400) respectively; Connect the intermediate connecting plate (201), the top pressing block (202), the bottom pressing block (203), the left upper pressing block (204), the left intermediate pressing block (205), the left lower pressing block (206), the right upper pressing block (207), the right intermediate pressing block (208), and the right lower pressing block (209) in sequence by using connecting pieces, and form the pressing plate assembly (200) after connection; Step two: blanking According to the size and layering sequence of the annular T-shaped reinforcing frame, carbon fiber epoxy unidirectional prepreg is cut and blanked; Step three: first layering On the surface of the pressing plate assembly (200), with the product length direction being the 0° direction, the surface of the above-mentioned pressing plate assembly (200) is sequentially layered with carbon fiber epoxy unidirectional prepreg web in the sequence of 45°, -45°, 0°, and 90° in a cycle; when the prepreg is laid, the air brought in between the layers is squeezed out; when the butt joint is layered, each layer is offset from the butt joint; On the surface of the above-mentioned lower mold plate (100), with the product length direction being the 0° direction, the surface of the above-mentioned lower mold plate (100) is sequentially layered with carbon fiber epoxy unidirectional prepreg web in the sequence of 45°, -45°, 0°, and 90° in a cycle; when the prepreg is laid, the air brought in between the layers is squeezed out; when the butt joint is layered, each layer is offset from the butt joint; Step four: assembly The pressing plate assembly (200) is connected on the first shaped protruding frame (102) of the lower mold plate (100) along the first shaped pressing groove (101); Step five: second layering After assembling the mold, the edge of the assembled mold is taken as the 0° direction, and the 45°, -45°, 0°, 90° sequence is adopted in turn to perform the carbon fiber epoxy unidirectional prepreg edge plate layering on the surface of the assembled mold; when the prepreg is laid, the air brought in between layers is extruded; when the butt joint layering is performed, the butt joint seams of each layer are staggered; Step six: compaction The left upper end movable block (301), the left upper movable block (302), the left lower movable block (303), the left lower end movable block (304), the right upper end movable block (305), the right upper movable block (306), the right lower movable block (307), and the right lower end movable block (308) are sequentially placed in the grooves of the lower mold plate (100) according to the marks, thereby forming the side pressure movable block assembly (300); The side pressure movable block assembly (300) is connected in the first forming pressure groove (101) of the lower mold plate (100); then the upper mold plate (400) is pressed on the top of the side pressure movable block assembly (300) and is connected and fixed with the lower mold plate (100) by using the connecting piece; After the connection is completed, the mold is placed in a hot press, and pre-compaction is performed according to the compaction system; Step seven: trimming After the mold is pre-compacted, carbon fiber epoxy unidirectional prepreg is used to repair the defects on the surface of the product; Step eight: third layering After assembling the mold, the edge of the assembled mold is taken as the 0° direction, and the 45°, -45°, 0°, 90° sequence is adopted in turn to perform the carbon fiber epoxy unidirectional prepreg edge plate layering on the surface of the assembled mold; when the prepreg is laid, the air brought in between layers is extruded; when the butt joint layering is performed, the butt joint seams of each layer are staggered; Step nine: solidification After the layering is completed, the upper mold plate (400) is connected to the lower mold plate (100) to assemble and clamp the mold by using the connecting piece; Then the mold is placed in a hot press, and solidification is performed according to the solidification system; Step ten: demolding The upper mold plate (400) is disassembled by using the reverse jack bolt; then the side pressure movable block assembly (300) is taken out; and then the pressing plate assembly (200) is demolded from the lower mold plate (100) by using the reverse jack bolt; The connecting pieces on the pressing plate assembly (200) are disassembled, and the parts on the pressing plate assembly (200) are taken out in turn; At this time, the composite material circumferential T-shaped reinforcing frame (500) can be obtained.

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