Carbon-ceramic composite material double-cavity guide vane forming mold and forming method

Abstract

The invention discloses a carbon-ceramic composite material double-cavity guide vane forming mold and a forming method, and belongs to the technical field of aero-engine double-cavity guide vanes. The forming die comprises an inner die, an outer die, a shaping tool and a fixing tool, wherein the inner die is arranged in the outer die; the shaping tool is used for positioning the outer mold and the inner mold, and the fixing tool is used for fixing the outer mold; the inner mold and the outer mold are used for forming the double-cavity guide vane. According to the method, when the upper margin plate or the lower margin plate of the double-cavity guide vane is prepared, the inner die and the outer die are positioned through the shaping tool, it is ensured that the position deviation is small after the inner die and the outer die are assembled, and it is ensured that the vane body molded surface size of the prepared guide vane conforms to the design size. According to the double-cavity guide vane forming method, firstly, the double-cavity vane body prefabricated body is formed, then it is guaranteed that the inner side and the outer side of the vane body are flanged to the upper edge plate and the lower edge plate in a flanging mode, the continuity of the vane body, the upper edge plate and the lower edge plate is guaranteed, the upper edge plate, the lower edge plate and the vane body are integrated, and the connecting strength of the edge plates and the vane body is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of dual-cavity guide vanes of aircraft engines, and in particular to a carbon-ceramic composite material dual-cavity guide vane forming die and a forming method. Background Art

[0002] High-pressure turbine guide vanes are core components of the hot end of aircraft engines or gas turbines. Their core functions include directing high-temperature gas flow toward the rotor blades and controlling the flow angle and velocity. They typically operate for extended periods in environments with temperatures exceeding 1650°C, high gas velocity erosion, and high-pressure oxidation. Carbon-ceramic composites (SiC / SiC) are considered a promising alternative to alloys due to their low density, ultra-high temperature stability, and excellent thermal shock resistance. Therefore, carbon-ceramic composites are currently used in the manufacture of high-pressure turbine guide vanes.

[0003] Because guide vanes have complex curved surfaces and are difficult to form, they are typically constructed in separate pieces, riveted together after the individual components meet density requirements. However, riveted structures are relatively weak, and there's a risk of rivet failure with long-term use. Furthermore, existing forming dies can experience mold positioning errors or core mold deformation during layup, leading to significant deviations between the preformed blade profile and the designed dimensions, impacting subsequent aerodynamic performance. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a carbon-ceramic composite double-cavity guide vane forming mold and a forming method, which solves the problem of large mold positioning error during layer laying in the existing forming mold.

[0005] In the first aspect, in order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: A carbon-ceramic composite material double-cavity guide vane forming mold, comprising an inner mold, an outer mold, a shaping tool and a fixing tool, wherein the inner mold is arranged inside the outer mold; the shaping tool positions the outer mold and the inner mold, and the fixing tool fixes the outer mold; The inner mold includes a first inner mold, a second inner mold and a sewing block, wherein the first inner mold and the second inner mold are provided with a sewing block, and the sewing block is provided with a sewing hole; The outer mold includes a blade outer mold, an upper edge plate outer mold and a lower edge plate outer mold; the blade outer mold is clamped on both sides of the inner mold; the upper edge plate outer mold and the lower edge plate outer mold are respectively arranged at the top and bottom of the inner mold.

[0006] In this solution, inner and outer molds are used to form the dual-cavity guide vanes. When preparing the upper or lower edge plates of the dual-cavity guide vanes, the inner and outer molds are positioned using a forming fixture to ensure minimal positional deviation after assembly, ensuring that the blade body dimensions of the prepared guide vanes match the designed dimensions. After the dual-cavity guide vane preform is prepared, a fixing fixture is used to secure the outer mold to facilitate subsequent processing.

[0007] Furthermore, the blade outer mold includes a first outer mold, a second outer mold and a third outer mold; the first outer mold and the second outer mold are connected by bolts, and the first outer mold and the second outer mold are arranged on one side of the inner mold; the third outer mold is arranged on the other side of the outer mold; the second outer mold and the third outer mold are connected by tightening bolts; positioning holes are opened on the second outer mold and the third outer mold, and first positioning pins are arranged in the positioning holes; The upper edge plate outer mold includes a fourth outer mold and a fifth outer mold, and the fourth outer mold and the fifth outer mold are arranged on the top of the blade outer mold; a second positioning pin is provided between the fourth outer mold and the blade outer mold, and a third positioning pin is provided between the fifth outer mold and the blade mold; The lower edge plate outer mold includes a sixth outer mold, a seventh outer mold and an eighth outer mold; the sixth outer mold and the seventh outer mold are arranged at the bottom of the blade outer mold; and the eighth outer mold is arranged on one side of the fourth outer mold and the sixth outer mold.

[0008] In this scheme, the first outer mold, the second outer mold and the third outer mold are used to form the middle position of the double-cavity guide vane; the fourth outer mold and the fifth outer mold are used to form the upper edge plate of the double-cavity guide vane, the sixth outer mold and the seventh outer mold are used to form the lower edge plate of the double-cavity guide vane, and the eighth outer mold is used to form the entire side of the double-cavity guide vane.

[0009] Furthermore, the shaping tooling comprises a first shaping block and a second shaping block, the outer mold is arranged between the first shaping block and the second shaping block, and the first shaping block and the second shaping block are connected by shaping bolts; A first positioning square groove is provided at one end of each of the first shaping block and the second shaping block; a positioning opening is further provided at the position where the first shaping block and the second shaping block are connected, and the two positioning openings are spliced ​​together to form a second positioning square groove; The two ends of the first outer mold and the second outer mold, as well as the two ends of the third outer mold, are provided with outer mold positioning platforms, which are embedded in the first positioning square groove and the second positioning square groove; An inner mold positioning square groove is provided at the position where the first shaping block and the second shaping block are connected at the bottom, and a point confirmation circular hole is provided in the inner mold positioning square groove; the bottoms of the first inner mold and the second inner mold are embedded in the inner mold positioning square groove.

[0010] In this solution, the first shaping block and the second shaping block are provided with the first positioning square groove and the second positioning square groove, and the first positioning square groove and the second positioning square groove form a limit with the outer mold positioning platform on the outer mold, thereby realizing the precise positioning of the outer mold; the inner mold positioning square groove at the bottom of the first shaping block and the second shaping block forms a limit with the bottom of the first inner mold and the second inner mold, thereby realizing the precise positioning of the inner mold.

[0011] Furthermore, the fixing tool includes a first pressing plate and a second pressing plate; two first bolts are provided at both ends of the first pressing plate, one of the first bolts passes through the fourth outer mold and the fifth outer mold and is connected to the eighth outer mold, and the other first bolt passes through the sixth outer mold and the seventh outer mold and is connected to the eighth outer mold; The two second pressing plates are respectively arranged on the top and bottom of the first pressing plate and the eighth outer mold, and the two second pressing plates are connected by second bolts.

[0012] Furthermore, the inner mold further includes a first positioning inner mold and a second positioning inner mold, and the first positioning inner mold and the second positioning inner mold are respectively installed at two ends of the first inner mold and the second inner mold.

[0013] In this solution, when the silicon carbide cloth is wound on the first inner mold and the second inner mold, the silicon carbide cloth can be limited by the first positioning inner mold and the second positioning inner mold, thereby avoiding mold positioning deviation during layering.

[0014] In a second aspect, the present invention provides a carbon-ceramic composite material double-cavity guide vane molding die based on the first aspect, and provides a carbon-ceramic composite material double-cavity guide vane molding method, comprising the following steps: S1: preparing a first preform and a second preform on a first inner mold and a second inner mold; S2: clamping and shaping the first preform and the second preform using an outer mold, and installing a shaping tool to position the outer mold and the inner mold; S3: Flanging the tops of the first preform and the second preform to prepare an upper edge plate; S4: Flanging the bottoms of the first preform and the second preform to prepare a lower edge plate; S5: Install the outer mold and use fixed tooling to clamp and fix the outer mold.

[0015] Furthermore, S1 includes: S101: Winding silicon carbide cloth on a first inner mold and a second inner mold to form a first silicon carbide cloth layer; then winding silicon carbide cloth on the entirety of the first inner mold and the second inner mold to form a second silicon carbide cloth layer; S102: Installing a first positioning inner mold and a second positioning inner mold at both ends of the first inner mold and the second inner mold respectively; S103: Filling the triangular area between the first silicon carbide cloth layer and the second silicon carbide cloth layer with silicon carbide fibers to obtain a first preform; S105: Continue to wind the silicon carbide cloth on the second silicon carbide cloth layer and bond them layer by layer to obtain a second preform; S106: Using 3K carbon fiber, sew the first preform and the second preform twice according to the positions of the sewing holes; when sewing, the carbon fiber is sewn to the inner wall surface of the double cavity through the oblique holes of the first inner mold and the second inner mold; the side wall surface of the large cavity is sewn through the oblique holes of the first inner mold; and the opposite sides of the double cavity are sewn through the holes on the vertical center planes of the first inner mold and the second inner mold.

[0016] Furthermore, S2 includes: S201: Connecting the first outer mold and the second outer mold using bolts, placing the connected outer molds in the first shaping block, and inserting the outer mold positioning platforms at the ends of the first outer mold and the second outer mold into the first positioning square groove and the second positioning square groove; S202: Disassembling the first positioning inner mold and the second positioning inner mold; S203: placing the inner mold and the assembly of the first preform and the second preform into the first shaping block, and fitting one side of the second preform to the first outer mold and the second outer mold; S204: Install the third outer mold so that the third outer mold fits the other side of the second preform; preliminarily connect the second outer mold and the third outer mold by tightening the bolts, and do not tighten the bolts; S205: Install the second shaping block and preliminarily connect the first shaping block and the second shaping block by shaping bolts; S206: Inserting the bottoms of the first inner mold and the second inner mold into the inner mold positioning square grooves, and confirming that the inner molds are installed in place by pointing the circular holes; after installation, tightening the fixing bolts to fix the first fixing block and the second fixing block; S207: Insert the first positioning pin into the positioning holes of the second outer mold and the third outer mold, connect the second outer mold and the third outer mold in place, and then tighten the tightening bolt.

[0017] Furthermore, S3 includes: S301: Cutting an opening of the silicon carbide cloth used to prepare the second preform and flanging the opening as needed, and then filling the opening with a silicon carbide cloth piece of a corresponding shape to form a flanging of the upper edge plate. S302: Pad the third preform into the flange of the upper edge plate in 2-3 layers in the form of a whole cloth; S304: preparing a fourth preform, placing the fourth preform on the flange of the upper edge plate, and then positioning the fourth preform using a second positioning pin; S305: cutting openings in the first silicon carbide cloth layer and the second silicon carbide cloth layer of the first preform and turning up the edges, and filling the openings with silicon carbide cloth sheets, so that the filled silicon carbide cloth sheets cover the bottom surface of the fourth preform; S306: preparing a fifth preform using the fourth outer mold and preparing a sixth preform using the fifth outer mold; positioning the fifth preform using the second positioning pin and positioning the sixth preform using the third positioning pin, so that the fifth and sixth preforms are installed in place; S307: Filling the triangular areas at the ends of the fifth and sixth preforms with silicon carbide fibers; S308: Flanging the corresponding side edges of the second preform after the flanged portion in S301 into place to obtain an upper edge plate preform; S309: Use 3k carbon fiber to sew the upper edge plate preform into place.

[0018] Furthermore, S4 includes: S401: dismantling the fourth outer mold and the fifth outer mold; S402: Installing the inner mold, the first preform, and the second preform upside down in a forming fixture; S403: Prepare the lower edge plate using the same method as that used to prepare the upper edge plate in S3.

[0019] The beneficial effects of the present invention are: The carbon-ceramic composite dual-cavity guide vane forming mold provided by the present invention comprises an inner mold and an outer mold for forming the dual-cavity guide vane. When preparing the upper or lower edge plate of the dual-cavity guide vane, the inner and outer molds are positioned using a molding fixture to ensure minimal positional deviation after assembly, ensuring that the blade body dimensions of the prepared guide vane conform to the designed dimensions. After the dual-cavity guide vane preform is prepared, the outer mold is secured using a fixing fixture to facilitate subsequent processing.

[0020] In the carbon-ceramic composite dual-cavity guide vane molding method provided by the present invention, a dual-cavity blade preform is first formed. Then, the blade is flanged both internally and externally to the upper and lower panels, ensuring fiber continuity between the blade and the upper and lower panels. This integrated preform design integrates the upper and lower panels with the blade, ensuring maximum fiber continuity and enhancing the bonding strength between the upper and lower panels and the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the double-cavity guide vane preform prepared by the present invention after being disassembled; Figure 2 This is a schematic diagram of the structure of the double-cavity guide vane preform of the present invention and a partial enlarged diagram; Figure 3 It is a schematic structural diagram of the first inner mold and the sewing block; Figure 4 Schematic diagram of the structure of winding the first silicon carbide cloth layer on the first inner mold and the second inner mold; Figure 5Schematic diagram of the structure of winding the second silicon carbide cloth layer on the first inner mold and the second inner mold; Figure 6 Schematic diagram of the structure of winding the second preform on the second silicon carbide cloth layer; Figure 7 A schematic diagram of the structure for sewing a first preform and a second preform; Figure 8 It is a structural diagram of the finalized tooling; Figure 9 A schematic diagram of the structure in which the first outer mold and the second outer mold are installed on the first shaping block; Figure 10 Figure 9 A structural diagram from another perspective; Figure 11 This is a structural diagram of the first outer mold, the second outer mold and the third outer mold installed in the finalizing tooling; Figure 12 This is a schematic structural diagram of the second preform flange; Figure 13 A schematic diagram of the structure for installing the fourth prefabricated body; Figure 14 This is a structural schematic diagram of the first preform flange; Figure 15 This is a schematic diagram of the structure of installing the fourth outer mold and the fifth outer mold on the upper edge plate prefabricated body; Figure 16 Schematic diagram of the structure of the fifth preform and the sixth preform; Figure 17 This is a schematic diagram of the structure for installing fixed tooling on the outer mold.

[0022] Reference numerals: 1. Inner mold; 101. First inner mold; 102. Second inner mold; 103. Sewing block; 104. First positioning inner mold; 105. Second positioning inner mold; 2. Outer mold; 201. First outer mold; 202. Second outer mold; 203. Third outer mold; 204. Fourth outer mold; 205. Fifth outer mold; 206. Sixth outer mold; 207. Seventh outer mold; 208. Eighth outer mold; 211. Outer mold positioning platform; 212. First positioning pin; 213. Tightening bolt; 214. Second positioning pin; 215. Third positioning pin; 3. Molding tool; 301. First molding block; 302. Second molding block; 303. First positioning square groove; 3 04, second positioning square groove; 305, inner mold positioning square groove; 306, point confirmation circular hole; 307, fixed bolt; 401, first preform; 402, second preform; 403, third preform; 404, fourth preform; 405, fifth preform; 406, sixth preform; 411, first silicon carbide cloth layer; 412, second silicon carbide cloth layer; 421, double cavity wall sewing line; 422, large cavity side wall sewing line; 423, double cavity opposite sewing line; 5, fixing tool; 501, first pressing plate; 502, second pressing plate; 503, first bolt; 504, second bolt; 6, lower edge plate; 7, upper edge plate; DETAILED DESCRIPTION The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Specific embodiments of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all inventions and creations utilizing the concepts of the present invention are protected.

[0023] Example 1 like Figures 1-17 As shown, this embodiment provides a carbon-ceramic composite double-cavity guide vane forming mold, which solves the problem of large mold positioning error during layer laying of existing forming molds; it specifically includes: Inner mold 1, outer mold 2, shaping tooling 3 and fixing tooling 5; The inner mold 1 is positioned within the outer mold 2. When preparing the upper edge plate 7 or lower edge plate 6 of a dual-cavity guide vane, the inner mold 1 and outer mold 2 are positioned using a shaping fixture 3 to ensure minimal positional deviation after assembly, ensuring the finished guide vane's blade profile dimensions match the designed dimensions. After the dual-cavity guide vane preform is prepared, the outer mold 2 is secured using a fixing fixture 5.

[0024] like Figure 3-Figure 7As shown, the inner mold 1 includes a first inner mold 101, a second inner mold 102, a sewing block 103, a first positioning inner mold 104, and a second positioning inner mold 105. The sewing block 103 is provided on the first and second inner molds 101, 102, and the sewing block 103 is provided with sewing holes. The first and second positioning inner molds 104, 105 are respectively mounted at the ends of the first and second inner molds 101, 102. When wrapping silicon carbide cloth around the first and second inner molds 101, 102, the first and second positioning inner molds 104, 105 can limit the position of the silicon carbide cloth, thereby avoiding mold positioning deviation during layup.

[0025] The outer mold 2 includes a blade outer mold, an upper edge plate outer mold and a lower edge plate outer mold; the blade outer mold is clamped on both sides of the inner mold 1; the upper edge plate outer mold and the lower edge plate outer mold are respectively arranged at the top and bottom of the inner mold 1.

[0026] like Figures 9-11 As shown, the blade outer mold includes a first outer mold 201, a second outer mold 202 and a third outer mold 203, and the first outer mold 201, the second outer mold 202 and the third outer mold 203 are used to form the middle position of the double-cavity guide vane; the first outer mold 201 and the second outer mold 202 are connected by bolts, and the first outer mold 201 and the second outer mold 202 are arranged on one side of the inner mold 1; the third outer mold 203 is arranged on the other side of the outer mold; the second outer mold 202 and the third outer mold 203 are connected by tightening bolts 213; positioning holes are opened on the second outer mold 202 and the third outer mold 203, and a first positioning pin 212 is arranged in the positioning hole.

[0027] like Figure 17 As shown, the upper edge plate outer mold includes a fourth outer mold 204 and a fifth outer mold 205, and the fourth outer mold 204 and the fifth outer mold 205 are used to form the upper edge plate 7 of the double-cavity guide vane; the fourth outer mold 204 and the fifth outer mold 205 are arranged on the top of the blade outer mold; a second positioning pin 214 is provided between the fourth outer mold 204 and the blade outer mold, and a third positioning pin 215 is provided between the fifth outer mold 205 and the blade mold.

[0028] like Figure 17 As shown, the lower edge plate outer mold includes a sixth outer mold 206, a seventh outer mold 207 and an eighth outer mold 208; the sixth outer mold 206 and the seventh outer mold 207 are used to form the lower edge plate 6 of the double-cavity guide vane, and the eighth outer mold 208 is used to form the entire side of the double-cavity guide vane; the sixth outer mold 206 and the seventh outer mold 207 are arranged at the bottom of the blade outer mold; the eighth outer mold 208 is arranged on one side of the fourth outer mold 204 and the sixth outer mold 206.

[0029] like Figure 8As shown, the shaping tool 3 includes a first shaping block 301 and a second shaping block 302 , the outer mold is arranged between the first shaping block 301 and the second shaping block 302 , and the first shaping block 301 and the second shaping block 302 are connected by shaping bolts 307 .

[0030] A first positioning square groove 303 is provided at one end of the first shaping block 301 and the second shaping block 302 ; a positioning opening is further provided at the connection position of the first shaping block 301 and the second shaping block 302 , and the two positioning openings are spliced ​​together to form a second positioning square groove 304 .

[0031] The outer mold positioning platforms 211 are provided at the two ends of the first outer mold 201 and the second outer mold 202, as well as at both ends of the third outer mold 203. The outer mold positioning platforms 211 are embedded in the first positioning square groove 303 and the second positioning square groove 304 to achieve precise positioning of the outer mold 2.

[0032] An inner mold positioning square groove 305 is provided at the connecting position of the bottom of the first shaping block 301 and the second shaping block 302, and a point confirmation circular hole 306 is provided in the inner mold positioning square groove 305; the bottom of the first inner mold 101 and the second inner mold 102 are embedded in the inner mold positioning square groove 305 to achieve precise positioning of the inner mold 1.

[0033] like Figure 17 As shown, the fixing tool 5 includes a first pressing plate 501 and a second pressing plate 502; two first bolts 503 are provided at both ends of the first pressing plate 501, one of the first bolts 503 passes through the fourth outer mold 204 and the fifth outer mold 205 and is connected to the eighth outer mold 208, and the other first bolt 503 passes through the sixth outer mold 206 and the seventh outer mold 207 and is connected to the eighth outer mold 208; The two second pressing plates 502 are respectively arranged on the top and bottom of the first pressing plate 501 and the eighth outer mold 208 , and the two second pressing plates 502 are connected by second bolts 504 .

[0034] Example 2 like Figures 1-17 As shown, this embodiment provides a carbon-ceramic composite material double-cavity guide vane molding die based on the embodiment 1, and a carbon-ceramic composite material double-cavity guide vane molding method, including the following steps: S1: preparing a first preform 401 and a second preform 402 on a first inner mold 101 and a second inner mold 102; specifically comprising: S101: Wrap a layer of 1k silicon carbide cloth on the first inner mold 101 and the second inner mold 102 to form a first silicon carbide cloth layer 411. Figure 4 Then three layers of silicon carbide cloth are wound around the first inner mold 101 and the second inner mold 102 as a whole to form a second silicon carbide cloth layer 412, as shown Figure 5 As shown; S102: Install a first positioning inner mold 104 and a second positioning inner mold 105 at both ends of the first inner mold 101 and the second inner mold 102 respectively; S103: Filling the triangular area of ​​the first silicon carbide cloth layer 411 and the second silicon carbide cloth layer 412 with silicon carbide fibers to obtain a first preform 401; S105: Continue to wind 7 layers of silicon carbide cloth on the second silicon carbide cloth layer 412, and bond them layer by layer to obtain the second preform 402, such as Figure 6 As shown; when cutting the fabric, please note that about 40mm should be left at both ends of the preform for flanging later; S106: Using 3K carbon fiber, sew the first preform 401 and the second preform 402 twice according to the positions of the sewing holes; like Figure 7 As shown, during sewing, the carbon fibers are sewn to the inner wall of the double cavity through the oblique holes of the first inner mold 101 and the second inner mold 102, and the sewing line passing through here is the double cavity wall sewing line 421; The side wall of the large cavity is sewn through the oblique hole of the first inner mold 101. The sewing line passing through this hole is the side wall sewing line 422 of the large cavity; The double-cavity opposite sides are sewn through the hole in the vertical center plane of the first inner mold 101 and the second inner mold 102 , and the sewing line passing through this hole is the double-cavity opposite side sewing line 423 .

[0035] S2: clamping and shaping the first preform 401 and the second preform 402 using an outer mold, and installing a shaping tool 3 to position the outer mold and the inner mold 1; specifically including: S201: Use bolts to connect the first outer mold 201 and the second outer mold 202. After connection, place them in the first shaping block 301, and make the outer mold positioning platforms 211 at the ends of the first outer mold 201 and the second outer mold 202 be embedded in the first positioning square groove 303 and the second positioning square groove 304; S202: Dismantle the first positioning inner mold 104 and the second positioning inner mold 105; S203: Place the inner mold 1 and the first preform 401 and the second preform 402 into the first shaping block 301, and fit one side of the second preform 402 to the first outer mold 201 and the second outer mold 202. Figure 9 As shown; S204: Install the third outer mold 203 so that the third outer mold 203 is in contact with the other side of the second preform 402; preliminarily connect the second outer mold 202 and the third outer mold 203 by tightening the bolts 213, and do not tighten the bolts 213; S205: Install the second shaping block 302 and preliminarily connect the first shaping block 301 and the second shaping block 302 through shaping bolts 307; S206: Make the bottom of the first inner mold 101 and the second inner mold 102 embed into the inner mold positioning square groove 305, and confirm that the inner mold 1 is installed in place through the point confirmation hole 306; after installation, tighten the setting bolts 307 to fix the first setting block 301 and the second setting block 302; Figure 11 As shown; S207: Insert the first positioning pin 212 into the positioning holes of the second outer mold 202 and the third outer mold 203 to connect the second outer mold 202 and the third outer mold 203 in place, and then tighten the tightening bolt 213.

[0036] S3: Flanging the tops of the first preform 401 and the second preform 402 to prepare the upper edge plate 7; specifically comprising: S301: Cut the opening of the silicon carbide cloth used to prepare the second preform 402 and turn the edge as needed. After turning the edge, fill the opening with a silicon carbide cloth piece of corresponding shape to form the turning edge of the upper edge plate 7, such as Figure 12 As shown; S302: Pad the third preform 403 in the form of a whole cloth in 2-3 layers at a time into the flange of the upper edge plate 7; S304: Prepare the fourth preform 404, and place the fourth preform 404 on the flange of the upper edge plate 7, and then position the fourth preform 404 by the second positioning pin 214, as shown in FIG. Figure 13 As shown; S305: Cut the first silicon carbide cloth layer 411 and the second silicon carbide cloth layer 412 of the first preform 401 into openings and turn the edges, and fill the openings with silicon carbide cloth sheets, and the filled silicon carbide cloth sheets cover the bottom surface of the fourth preform 404, as shown in FIG. Figure 14 As shown; S306: Use the fourth outer mold 204 to prepare the fifth preform 405, and use the fifth outer mold 205 to prepare the sixth preform 406; then use the second positioning pin 214 to position the fifth preform 405, and use the third positioning pin 215 to position the sixth preform 406, so that the fifth preform 405 and the sixth preform 406 are installed in place. Figure 15 As shown; S307: Filling the triangular areas at the ends of the fifth preform 405 and the sixth preform 406 with silicon carbide fibers; S308: Flanging the corresponding side edges of the second preform 402 after flanging in S301 into place to obtain the upper edge plate 7 preform; S309: Use 3k carbon fiber to sew the upper edge plate 7 preform into place, and the sewing line is as follows Figure 16 shown.

[0037] S4: Flanging the bottoms of the first preform 401 and the second preform 402 to prepare the lower edge plate 6; specifically comprising: S401: dismantling the fourth outer mold 204 and the fifth outer mold 205; S402: The inner mold 1 and the first preform 401 and the second preform 402 are installed upside down in the shaping tool 3; S403: Prepare the lower edge plate 6 using the same method as that used to prepare the upper edge plate 7 in S3.

[0038] S5: Install the outer mold and clamp and fix the outer mold using the fixed tool 5; specifically including: S501: If Figure 17 As shown, a fourth outer mold 204, a fifth outer mold 205, a sixth outer mold 206, a seventh outer mold 207 and an eighth outer mold 208 are installed; S502: Install the first pressing plate 501 and connect the first pressing plate 501 and the eighth outer mold 208 via the first bolt 503; S503 : two second pressing plates 502 are arranged on the top and bottom of the first pressing plate 501 and the eighth outer mold 208 , and the two second pressing plates 502 are connected by second bolts 504 .

[0039] Those skilled in the art will appreciate that the embodiments herein are intended to help readers understand the principles of the present invention, and it should be understood that the scope of protection of the present invention is not limited to such specific descriptions and embodiments. Those skilled in the art can make various other specific variations and combinations based on the technical teachings disclosed in the present invention without departing from the essence of the present invention, and such variations and combinations are still within the scope of protection of the invention.

Claims

1. A carbon-ceramic composite double-cavity guide vane forming mold, characterized by: It comprises an inner mold (1), an outer mold (2), a shaping tool (3) and a fixing tool (5), wherein the inner mold (1) is arranged inside the outer mold (2); the shaping tool (3) positions the outer mold (2) and the inner mold (1), and the fixing tool (5) fixes the outer mold (2); The inner mold (1) comprises a first inner mold (101), a second inner mold (102) and a sewing block (103); the first inner mold (101) and the second inner mold (102) are provided with a sewing block (103), and the sewing block (103) is provided with a sewing hole; The outer mold (2) comprises a blade outer mold, an upper edge plate outer mold and a lower edge plate outer mold; the blade outer mold is clamped on both sides of the inner mold (1); the upper edge plate outer mold and the lower edge plate outer mold are respectively arranged at the top and bottom of the inner mold (1).

2. The carbon-ceramic composite double-cavity guide vane forming mold according to claim 1, characterized in that: The blade outer mold comprises a first outer mold (201), a second outer mold (202) and a third outer mold (203); the first outer mold (201) and the second outer mold (202) are connected by bolts, and the first outer mold (201) and the second outer mold (202) are arranged on one side of the inner mold (1); the third outer mold (203) is arranged on the other side of the outer mold; the second outer mold (202) and the third outer mold (203) are connected by tightening bolts (213); the second outer mold (202) and the third outer mold (203) are both provided with positioning holes, and first positioning pins (212) are provided in the positioning holes; The upper edge plate outer mold comprises a fourth outer mold (204) and a fifth outer mold (205), wherein the fourth outer mold (204) and the fifth outer mold (205) are arranged on top of the blade outer mold; a second positioning pin (214) is provided between the fourth outer mold (204) and the blade outer mold, and a third positioning pin (215) is provided between the fifth outer mold (205) and the blade mold; The lower edge plate outer mold comprises a sixth outer mold (206), a seventh outer mold (207) and an eighth outer mold (208); the sixth outer mold (206) and the seventh outer mold (207) are arranged at the bottom of the blade outer mold; and the eighth outer mold (208) is arranged on one side of the fourth outer mold (204) and the sixth outer mold (206).

3. The carbon-ceramic composite material double-cavity guide vane forming mold according to claim 2, characterized in that: The shaping fixture (3) comprises a first shaping block (301) and a second shaping block (302); the outer mold (2) is arranged between the first shaping block (301) and the second shaping block (302); the first shaping block (301) and the second shaping block (302) are connected via shaping bolts (307); One end of each of the first shaping block (301) and the second shaping block (302) is provided with a first positioning square groove (303); a positioning opening is further provided at the position where the first shaping block (301) and the second shaping block (302) are connected, and the two positioning openings are spliced ​​together to form a second positioning square groove (304); The two ends of the first outer mold (201) and the second outer mold (202) that are separated from each other, as well as the two ends of the third outer mold (203), are provided with outer mold positioning platforms (211), and the outer mold positioning platforms (211) are embedded in the first positioning square groove (303) and the second positioning square groove (304); An inner mold positioning square groove (305) is provided at the connecting position of the bottom of the first shaping block (301) and the second shaping block (302), and a point confirmation circular hole (306) is provided in the inner mold positioning square groove (305); the bottoms of the first inner mold (101) and the second inner mold (102) are embedded in the inner mold positioning square groove (305).

4. The carbon-ceramic composite double-cavity guide vane forming mold according to claim 2, characterized in that: The fixing fixture (5) comprises a first pressing plate (501) and a second pressing plate (502); two first bolts (503) are provided at both ends of the first pressing plate (501), wherein one first bolt (503) passes through the fourth outer mold (204) and the fifth outer mold (205) and is connected to the eighth outer mold (208), and the other first bolt (503) passes through the sixth outer mold (206) and the seventh outer mold (207) and is connected to the eighth outer mold (208); The two second pressing plates (502) are respectively arranged on the top and bottom of the first pressing plate (501) and the eighth outer mold (208), and the two second pressing plates (502) are connected by second bolts (504).

5. The carbon-ceramic composite material double-cavity guide vane forming mold according to claim 1, characterized in that: The inner mold (1) further comprises a first positioning inner mold (104) and a second positioning inner mold (105), wherein the first positioning inner mold (104) and the second positioning inner mold (105) are respectively mounted at two ends of the first inner mold (101) and the second inner mold (102).

6. A molding method for a carbon-ceramic composite material double-cavity guide vane molding die according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: preparing a first preform (401) and a second preform (402) on a first inner mold (101) and a second inner mold (102); S2: clamping and shaping the first preform (401) and the second preform (402) using the outer mold (2), and installing a shaping tool (3) to position the outer mold (2) and the inner mold (1); S3: Flanging the tops of the first preform (401) and the second preform (402) to prepare an upper edge plate (7); S4: Flanging the bottoms of the first preform (401) and the second preform (402) to prepare a lower edge plate (6); S5: Install the outer mold (2), and use the fixing tool (5) to clamp and fix the outer mold (2).

7. The molding method of the carbon-ceramic composite material double-cavity guide vane molding die according to claim 6, characterized in that: Said S1 comprises: S101: Winding silicon carbide cloth on each of the first inner mold (101) and the second inner mold (102) to form a first silicon carbide cloth layer (411); then winding silicon carbide cloth on the entirety of the first inner mold (101) and the second inner mold (102) to form a second silicon carbide cloth layer (412); S102: installing a first positioning inner mold (104) and a second positioning inner mold (105) at both ends of the first inner mold (101) and the second inner mold (102), respectively; S103: Filling the triangular area of ​​the first silicon carbide cloth layer (411) and the second silicon carbide cloth layer (412) with silicon carbide fibers to obtain a first preform (401); S105: Continue to wind the silicon carbide cloth on the second silicon carbide cloth layer (412), and bond them layer by layer to obtain a second preform (402); S106: Using 3K carbon fiber, the first preform (401) and the second preform (402) are sewn through twice according to the positions of the sewing holes; during sewing, the carbon fiber is sewn to the inner wall surface of the double cavity through the oblique holes of the first inner mold (101) and the second inner mold (102); the side wall surface of the large cavity is sewn through the oblique holes of the first inner mold (101); and the opposite sides of the double cavity are sewn through the holes on the vertical center planes of the first inner mold (101) and the second inner mold (102).

8. The molding method of the carbon-ceramic composite material double-cavity guide vane molding die according to claim 7, characterized in that: The S2 includes: S201: Using bolts to connect the first outer mold (201) and the second outer mold (202), placing them in the first shaping block (301) after connection, and embedding the outer mold positioning platforms (211) at the ends of the first outer mold (201) and the second outer mold (202) into the first positioning square groove (303) and the second positioning square groove (304); S202: disassembling the first positioning inner mold (104) and the second positioning inner mold (105); S203: placing the inner mold (1) and the assembly of the first preform (401) and the second preform (402) into the first shaping block (301), and fitting one side of the second preform (402) to the first outer mold (201) and the second outer mold (202); S204: Install the third outer mold (203) so that the third outer mold (203) fits the other side of the second preform (402); perform a preliminary connection between the second outer mold (202) and the third outer mold (203) by tightening the bolts (213), and do not tighten the bolts (213); S205: Install the second shaping block (302), and preliminarily connect the first shaping block (301) and the second shaping block (302) via shaping bolts (307); S206: Embed the bottoms of the first inner mold (101) and the second inner mold (102) into the inner mold positioning square groove (305), and confirm that the inner mold (1) is installed in place by confirming the circular hole (306); after installation, tighten the fixing bolts (307) to fix the first fixing block (301) and the second fixing block (302); S207: Insert the first positioning pin (212) into the positioning holes of the second outer mold (202) and the third outer mold (203), connect the second outer mold (202) and the third outer mold (203) in place, and then tighten the tightening bolt (213).

9. The molding method of the carbon-ceramic composite material double-cavity guide vane molding die according to claim 8, characterized in that: The S3 includes: S301: cutting an opening of the silicon carbide cloth used to prepare the second preform (402) as required and turning the edge, and then filling the opening with a silicon carbide cloth piece of a corresponding shape after turning the edge to form a turning edge of the upper edge plate; S302: padding the third preform (403) into the flange of the upper edge plate in the form of a whole cloth with 2-3 layers between them; S304: preparing a fourth preform (404), placing the fourth preform (404) on the flange of the upper edge plate, and then positioning the fourth preform (404) using a second positioning pin (214); S305: cutting openings and turning up the edges of the first silicon carbide cloth layer (411) and the second silicon carbide cloth layer (412) of the first preform (401), and filling the openings with silicon carbide cloth sheets, so that the filled silicon carbide cloth sheets cover the bottom surface of the fourth preform (404); S306: using the fourth outer mold (204) to prepare a fifth preform (405), and using the fifth outer mold (205) to prepare a sixth preform (406); then positioning the fifth preform (405) using the second positioning pin (214), and positioning the sixth preform (406) using the third positioning pin (215), so that the fifth preform (405) and the sixth preform (406) are installed in place; S307: Filling the triangular areas at the ends of the fifth preform (405) and the sixth preform (406) with silicon carbide fibers; S308: Flanging the corresponding side edges of the second preform (402) after flanging in S301 into place to obtain an upper edge plate preform; S309: Use 3k carbon fiber to sew the upper edge plate preform into place.

10. The molding method of the carbon-ceramic composite material double-cavity guide vane molding die according to claim 9, characterized in that: The S4 includes: S401: removing the fourth outer mold (204) and the fifth outer mold (205); S402: Installing the assembly of the inner mold (1), the first preform (401), and the second preform (402) upside down in the shaping fixture (3); S403: Prepare the lower edge plate (6) using the same method as that used to prepare the upper edge plate (7) in S3.

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