CN109397494B - Ceramic matrix composite grid reinforced member forming mold and preparation method thereof - Google Patents
Ceramic matrix composite grid reinforced member forming mold and preparation method thereof Download PDFInfo
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- CN109397494B CN109397494B CN201811264774.XA CN201811264774A CN109397494B CN 109397494 B CN109397494 B CN 109397494B CN 201811264774 A CN201811264774 A CN 201811264774A CN 109397494 B CN109397494 B CN 109397494B
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- rib plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/24—Unitary mould structures with a plurality of moulding spaces, e.g. moulds divided into multiple moulding spaces by integratable partitions, mould part structures providing a number of moulding spaces in mutual co-operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
- B28B3/025—Hot pressing, e.g. of ceramic materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0002—Auxiliary parts or elements of the mould
Abstract
The invention relates to a ceramic matrix composite grid reinforced member forming die and a preparation method thereof, wherein the die comprises a female die, a male die, a skin forming slide block, a rib plate forming pressing strip and a rib plate forming slide block; the prepreg can realize larger shrinkage along the thickness direction of the rib plate in the molding process; guarantee that the component is pressed everywhere evenly in the forming process, avoid the component to appear the shaping defect, avoid the forming process because the mould produces the shearing to preimpregnation material and cause the fibrous destruction to reinforced structure department, realized the whole shaping of component, guaranteed the shaping position and the thickness of net gusset through the shaping of branch simultaneously, effectively improved the shaping quality of this type of component when guaranteeing the component size.
Description
Technical Field
The invention discloses a ceramic matrix composite grid reinforced member forming mold and a preparation method thereof, and belongs to the technical field of composite material forming and manufacturing.
Technical Field
The ceramic matrix composite has important application in the fields of aerospace and the like due to the characteristics of high temperature oxidation resistance, low density and the like, becomes one of the most concerned hot materials of domestic and foreign related research units, and the breakthrough of key technology in material research and development, member forming and industrial application of the ceramic matrix composite can have great influence on the development of aerospace and related application fields. At present, the GE company in the United states has established a mature production line and realized the mass production of the ceramic matrix composite components, and the application of the ceramic matrix composite on the aeroengine is promoted to a great extent. In the present stage, the ceramic matrix composite material has important application in hot end parts of aircraft engines, such as high-pressure and low-pressure turbine disks, blades, combustion chambers, afterburners, flame stabilizers, exhaust nozzles and the like. With the gradual popularization of the application range of the ceramic matrix composite, the types of related components are gradually increased, the shapes are gradually complicated, and the difficult problem of complex structure forming is increasingly prominent by combining the characteristics of the forming process of the ceramic matrix composite.
The ceramic matrix composite reinforced member is in a common member shape, compared with a single-rib or double-rib structure, the grid reinforced member has the advantages that the number of the rib plates is obviously increased, and meanwhile, due to position constraint among the rib plates, the integral forming difficulty is higher. At present, most of the forming methods of the resin matrix composite reinforced wall plate structure adopt autoclave forming, but because of the characteristics of fibers and slurry adopted by the ceramic matrix composite, the ceramic matrix composite has certain influence on the near net forming of a component during autoclave forming, and meanwhile, the ceramic matrix composite has higher forming pressure and higher requirement on the autoclave forming pressure, thereby greatly increasing the requirement on the comprehensive performance of equipment. At present, in the domestic research on adopting prepreg forming members, the application scale of the ceramic matrix composite prepreg forming members is relatively small, and the reports of the forming method of the reinforcement member are less; the structure of the typical ceramic matrix composite prepared in foreign countries is simpler, and few reinforcement members exist, so that the research on forming the ceramic matrix composite reinforcement member prefabricated body by adopting the silicon carbide fiber prepreg is rarely reported.
Disclosure of Invention
The invention provides a forming mold of a ceramic matrix composite grid reinforced member and a preparation method thereof aiming at the forming problem of the ceramic matrix composite grid reinforced member formed in the prior art, and aims to realize the integral forming of the ceramic matrix composite grid reinforced member so as to improve the forming quality of the ceramic matrix composite grid reinforced member.
The purpose of the invention is realized by the following technical scheme:
the invention provides a ceramic matrix composite grid reinforced member forming die, wherein the bottom of a member of a grid reinforced member 1 is a square or rectangular plane base 11, four sides formed by surrounding skin 12 are arranged around the plane base 11, the insides of the four sides of the skin 12 are divided into grid units by rib plates 13 which are orthogonally distributed, a grid unit body 14 is formed in the space in each grid unit, and the height of each rib plate 13 is flush with that of the skin 12, and the ceramic matrix composite grid reinforced member forming die is characterized in that: the mold comprises:
the female die 2 is formed by processing a female die groove 21 on a metal blank according to the sizes of the plane base 11 and the skin 12 of the grid reinforcement member 1, flanges 22 are arranged on the periphery of the female die groove 21, the flanges 22 respectively correspond to the four sides of the plane base 11, the length of each flange 22 is larger than the side length of the corresponding plane base 11, and the length difference is equal to twice the thickness of the skin forming slide block 3;
the skin forming slide blocks 3 are rectangular metal blocks, a pressure inclined plane I31 is processed at the top end of one long side of each rectangular metal block and one side of each rectangular metal block along the long side direction, the number of the skin forming slide blocks 3 is four, the four skin forming slide blocks correspond to the flanges 22 around the female die groove 21 respectively, the length of each skin forming slide block 3 is smaller than that of the corresponding flange 22, and the length difference is equal to the thickness of the skin forming slide block 3;
the rib plate forming pressing strips 4 are rectangular metal blocks, the number of the rib plate forming pressing strips 4 is four, the rib plate forming pressing strips correspond to the flanges 22 around the female die groove 21 respectively, and the length of each rib plate forming pressing strip 4 is equal to the side length of the plane base 11 at the bottom of the corresponding grid reinforced component 1;
the rib plate forming slide block 5 is characterized in that the number of the rib plate forming slide blocks 5 is consistent with the number of grid units formed by dividing the rib plate 13 and corresponds to one another, the lower part of the rib plate forming slide block 5 is consistent with the shape of grid unit bodies 14 formed by dividing the rib plate 13, the upper part of the rib plate forming slide block 5 is higher than the upper edge of the rib plate 13, and two adjacent side surfaces of the upper part of the rib plate forming slide block 5 are processed into a pressure inclined surface II 51;
the male die 6 is characterized in that male die grooves 61 corresponding to the grid unit bodies 14 divided by the rib plates 13 in number, position and shape are machined in the metal blank of the male die 6, two adjacent side faces in each male die groove 61 are machined into pressing inclined planes I62 to be matched with the corresponding pressing inclined planes II 51 on the rib plate forming sliding blocks 5, four male die side grooves 63 corresponding to the skin forming sliding blocks 3 are machined in the periphery of the metal blank of the male die 6 to be positioned on the outer sides of the male die grooves 61, and one side face in each male die side groove 63 is machined into a pressing inclined plane II 64 to be matched with the corresponding pressing inclined plane I31 on the skin forming sliding blocks 3.
Further, the height of the upper part of the rib plate forming slide block 5, which is higher than the upper edge of the rib plate 13, is 1.5-3 times of the height of the grid reinforced member 1.
Furthermore, the included angle between the matching surface of the pressure-applying inclined plane II 64 in the male die side groove 63 of the male die 6 and the pressure-applying inclined plane I31 of the skin forming slide block 3 and the horizontal direction is 20-70 degrees.
Furthermore, the included angle between the matching surface of the pressing inclined plane I62 of the male die groove 61 and the pressing inclined plane II 51 on the rib plate forming slide block 5 and the horizontal direction is 20-70 degrees.
Further, the opposing male grooves 61 in the male mold 6 are symmetrical along the center line of the male mold 6.
The technical scheme of the invention also provides a method for preparing the ceramic matrix composite grid reinforced member by adopting the forming die, which comprises the following steps:
step one, mounting a first skin forming slide block 301 on the inner side surface of a flange 22, wherein a pressed inclined plane I31 of the first skin forming slide block 301 faces outwards during mounting;
step two, mounting a first rib plate forming pressing strip 401 on the inner side face of the first skin forming sliding block 301;
step three, taking the direction vertical to the inner side surface of the first rib plate forming pressing strip 401 as the installation direction of rib plate forming sliding blocks 5, selecting rib plate forming sliding blocks 5 with the same number as grid units in the direction, paving prepreg on five planes at the lower part of the rib plate forming sliding blocks 5 respectively, arranging the rib plate forming sliding blocks 5 along the direction, and completing the installation of the rib plate forming sliding blocks 5 in the first row;
step four, repeating the step three, and finishing the installation of the rib plate forming slide blocks 5 in other rows which are parallel to the rib plate forming slide block 5 in the first row;
step five, mounting a second rib plate forming pressing strip 402 at the other end of the arranged rib plate forming slide block 5 rows;
step six, mounting a second skin forming sliding block 302 at the outer side of a second rib plate forming pressing strip 402;
step seven, mounting a third rib plate forming pressing strip 403 and a third skin forming sliding block 303 below the rib plate forming sliding block in the 5-row vertical direction;
step eight, mounting a fourth rib plate forming pressing strip 404 and a fourth skin forming sliding block 304 on the rib plate forming sliding block in the direction vertical to the row 5;
step nine, mounting the male die 6, enabling a pressure applying inclined plane II 64 in a male die side groove 63 of the male die 6 to be matched with a pressure applying inclined plane I31 of the skin forming sliding block 3, enabling a pressure applying inclined plane I62 of a male die groove 61 to be matched with a pressure applying inclined plane II 51 on the rib plate forming sliding block 5, completing die assembly, and moving to a hot press to complete rib plate solidification;
step ten, after the curing is finished, removing the mold, taking out the four skin molding sliding blocks 301 and 304, and taking out the four rib plate molding pressing strips 401 and 404 to obtain grid rib plate blanks;
eleven, smearing or paving an adhesive on the periphery of the outer side of the grid rib plate blank, and paving a skin 61;
step twelve, mounting four skin molding sliding blocks 301 and 304 on the outer side of the molding prepreg of the skin 61;
and step thirteen, installing the male die 6, matching a pressure applying inclined plane II 64 in a male die edge groove 63 of the male die 6 with a pressure applying inclined plane I31 of the skin forming sliding block 3, matching a pressure applying inclined plane I62 of a male die groove 61 with a pressure applying inclined plane II 51 on the rib plate forming sliding block 5, completing die assembly, and moving to a hot press to complete integral curing of the grid reinforcing member 1.
Further, the prepreg is a silicon carbide fiber prepreg, a carbon fiber prepreg or an oxide prepreg.
Further, the height of the rib plate forming slide block 5 in each row of the rib plate forming slide block 5 is sequentially reduced from the beginning end so as to sequentially compact and shape the grid rib plates in the same row.
Furthermore, the rib plate forming slide block 5 rows are in a symmetrical structure along the center line of the female die 2, and the center line of the female die 2 is parallel to the installation direction of the rib plate forming slide block 5 rows.
Further, the adhesive comprises resin system slurry or a resin system adhesive film.
The technical scheme of the invention has the following advantages and characteristics:
1. according to the invention, the grid reinforced member is formed by the rib plate forming slide block 5 in rows, and a symmetrical co-curing forming sequence is adopted, so that the forming efficiency is effectively improved while the forming quality and the forming position of each rib plate are ensured;
2. in the grid reinforced member co-curing forming process, a co-curing system is selectively introduced according to the rib plate forming effect, the used system is the same as a prepreg system or is completely removed after high-temperature treatment, a new system is not introduced, the position and the wall plate thickness in the grid reinforced member forming process are not influenced, the rib plate forming position in the reinforced member is ensured, and the subsequent porous body preparation and the ceramic matrix composite member preparation process performance are facilitated;
3. according to the invention, the height gradient of the rib plate forming slide block 5 in the same row is changed, so that each rib plate is sequentially pressed, and the forming position of each rib plate is effectively ensured.
4. The invention realizes the whole near-net forming of the grid reinforced structure through the design of the die of the grid reinforced member, is beneficial to improving the forming quality of the grid reinforced member made of the ceramic matrix composite material, and has important significance for further improving the forming efficiency of the ceramic matrix composite material member, realizing the near-net forming of the ceramic matrix composite material member, reducing the subsequent processing amount, reducing the processing difficulty and cost, prolonging the long service life of the ceramic matrix composite material member in industrial application and the like.
Drawings
FIG. 1 is a schematic view of a grid reinforcement member
FIG. 2 is a schematic view of a female mold structure in the mold of the present invention
FIG. 3 is a schematic structural diagram of a skin forming slider in the mold according to the present invention
FIG. 4 is a schematic structural view of a rib plate molding batten in the mold of the invention
FIG. 5 is a schematic structural view of a rib plate forming slide block in the mold of the invention
FIG. 6 is a schematic structural view of a male mold in the mold of the present invention
FIG. 7 is a schematic view showing the arrangement of layers of A, B ribbed plates of a grid reinforced member and the installation of a forming mold, wherein the left side view is a schematic view showing the arrangement of the layers in the A/B area, and the right side view is a schematic view showing the assembly of the forming mold in the A/B area
FIG. 8 is an installation diagram of a layer forming mold for C, D ribbed plates of a grid reinforced member, wherein the left side diagram is a C/D zone layer forming diagram, and the right side diagram is a C/D zone forming mold assembly diagram
FIG. 9 is a schematic view showing the installation of the skin laying layer and the forming mold of the grid reinforced member
Detailed Description
The design of the mold and the molding method for co-curing and molding the ceramic matrix composite grid reinforced member will be described with reference to the drawings and specific examples.
In this embodiment, the bottom of the grid reinforcing member 1 is a square planar base 11, four sides formed by surrounding the skin 12 around the planar base 11 are four sides, the interior of four sides of the skin 12 is divided into grid units of 4 × 4 by the rib plates 13 distributed orthogonally, a space in each grid unit forms a grid unit 14, the height of the rib plate 13 is flush with the skin 12, and the forming mold for the grid reinforcing member made of the ceramic matrix composite material comprises:
the female die 2 is formed by processing a female die groove 21 on a metal blank according to the sizes of the plane base 11 and the skin 12 of the grid reinforcement member 1, ribs 22 are arranged around ribs 22 of the female die groove 21, the ribs 22 respectively correspond to four sides of the plane base 11, the length of each rib 22 is larger than the side length of the corresponding plane base 11, and the length difference is equal to twice the thickness of the skin forming slide block 3;
the skin forming slide blocks 3 are rectangular metal blocks, a pressure inclined plane I31 is processed at the top end of one long side of each rectangular metal block and one side of each rectangular metal block along the long side direction, the angle of the processed inclined plane is 45 degrees, the number of the skin forming slide blocks 3 is four, the four skin forming slide blocks respectively correspond to the flanges 22 around the female die groove 21, the length of each skin forming slide block 3 is smaller than the length of the corresponding flange 22, and the length difference is equal to the thickness of the skin forming slide block 3;
the rib plate forming pressing strips 4 are rectangular metal blocks, the number of the rib plate forming pressing strips 4 is four, the rib plate forming pressing strips correspond to the flanges 22 around the female die groove 21 respectively, and the length of each rib plate forming pressing strip 4 is equal to the side length of the plane base 11 at the bottom of the corresponding grid reinforced component 1;
the rib plate forming slide blocks 5 are sixteen, the lower parts of the rib plate forming slide blocks 5 are consistent with the grid unit bodies 14 divided by rib plates 13 in shape, the upper parts of the rib plate forming slide blocks 5 are higher than the grid rib member by one time of 1, two adjacent side surfaces of the upper parts of the rib plate forming slide blocks 5 are processed into pressure-bearing inclined surfaces II 51, the angle of each inclined surface is 45 degrees, the height of the rib plate forming slide blocks 5 in each row of the rib plate forming slide blocks 5 is sequentially reduced from the beginning end, and the height difference is 5mm, so that the grid rib plates in the same row are sequentially compacted and shaped;
the male die 6 is characterized in that sixteen male die grooves 61 corresponding to the grid unit bodies 14 in position and shape are machined in a metal blank, two adjacent side faces in each male die groove 61 are machined into a pressing inclined face I62 to be matched with a pressing inclined face II 51 on a corresponding rib plate forming sliding block 5, the angle of the machining inclined face is 45 degrees, four male die edge grooves 63 corresponding to the skin forming sliding blocks 3 are machined in the periphery of the metal blank of the male die 6 and are located on the outer sides of the male die grooves 61, one side face in each male die edge groove 63 is machined into a pressing inclined face II 64 to be matched with a pressing inclined face I31 on the corresponding skin forming sliding block 3, and the angle of the machining inclined face is 45 degrees.
The method for preparing the ceramic matrix composite grid reinforced member by adopting the forming die comprises the following steps:
step one, mounting a first skin forming slide block 301 on the inner side surface of a flange 22, wherein a pressed inclined plane I31 of the first skin forming slide block 301 faces outwards during mounting;
step two, mounting a first rib plate forming pressing strip 401 on the inner side face of the first skin forming sliding block 301;
step three, taking the direction vertical to the inner side surface of the first rib plate forming pressing strip 401 as the installation direction of the rib plate forming sliding block 5, selecting 8 rib plate forming sliding blocks 5A1-5A4 and 5B1-5B4, cutting silicon carbide fiber prepreg, paving the prepreg on five planes at the lower parts of the rib plate forming sliding blocks 5A1-5A4 and 5B1-5B4, arranging the rib plate forming sliding blocks into two rows along the direction, wherein the rows are respectively an A row and a B row, namely 5A1-5A4 and 5B1-5B4, and completing the installation of the rib plate forming sliding blocks of the A, B row;
step four, mounting a second rib plate forming pressing strip 402 at the tail ends of two rows of rib plate forming sliding blocks 5A4 and 5B4 which are arranged, and mounting a second skin forming sliding block 302 at the outer side of the second rib plate forming pressing strip 402;
step five, mounting third and fourth rib plate forming pressing strips 403 and 404 below and above the vertical direction of the two rows of rib plate forming sliding blocks 5A1-5A4 and 5B1-5B4, and mounting a row of rib plate forming sliding blocks at the outer sides of the third and fourth rib plate forming pressing strips 403 and 404 respectively, wherein the number of rib plate forming sliding blocks is 8, namely C row and D row, 5C1-5C4 and 5D1-5D 4;
sixthly, mounting the male die 6, enabling a pressure applying inclined plane II 64 in a male die edge groove 63 of the male die 6 to be matched with a pressure applying inclined plane I31 of the skin forming slide block 3, and enabling a pressure applying inclined plane I62 of a male die groove 61 to be matched with a pressure applying inclined plane II 51 on the rib plate forming slide block 5, and completing die assembly;
and step seven, after die assembly, moving the die to a hot press to finish curing of the partial rib plates in the A row and the B row. Setting the heating rate of a press to be 2 ℃/min, heating to 300 ℃, setting the pressure to be 5Mpa, and maintaining the pressure for 2 h;
step eight, after the first curing is finished, disassembling the die, taking out the rib plate forming slide blocks 5C1-5C4 and 5D1-5D4 of the C row and the D row, the rib plate forming press strips 403 and 404 of the third row and the fourth row, and taking out the second rib plate forming press strip 402 and the second skin forming slide block 302; (ii) a
Step nine, cutting silicon carbide fiber prepreg, paving the prepreg on five planes at the lower parts of 8 rib plate forming sliding blocks, and rearranging and installing the rib plate forming sliding blocks in the rows C and D along the direction;
tenth, mounting a second rib plate forming pressing strip 402 at the tail ends of the rib plate forming sliding blocks 5C4 and 5D4 of the arranged C row and D row, and mounting a second skin forming sliding block 302 at the outer side of the second rib plate forming pressing strip 402;
eleventh, a third rib plate forming pressing strip 403 and a third skin forming sliding block 303 are installed below the C-row rib plate forming sliding block in the vertical direction, and a fourth rib plate forming pressing strip 404 and a fourth skin forming sliding block 304 are installed above the D-row rib plate forming sliding block in the vertical direction;
step twelve, installing the male die 6, enabling a pressure applying inclined plane II 64 in a male die side groove 63 of the male die 6 to be matched with a pressure applying inclined plane I31 of the skin forming sliding block 3, enabling a pressure applying inclined plane I62 of a male die groove 61 to be matched with a pressure applying inclined plane II 51 on the rib plate forming sliding block 5, completing die assembly, and moving to a hot press to complete rib plate solidification;
and step thirteen, after the die, moving the die to a hot press to finish the solidification of the rib plates in the rows C and D. Setting the heating rate of a press to be 2 ℃/min, heating to 300 ℃, setting the pressure to be 5Mpa, and maintaining the pressure for 2 h;
fourteen, after the curing is finished, removing the mold, taking out the four skin molding sliding blocks 301 and 304, and taking out the four rib plate molding pressing strips 401 and 404 to obtain grid rib plate blanks;
fifteen, coating resin system slurry on the periphery of the outer side of the grid rib plate blank and paving a formed prepreg of the skin 61;
sixthly, mounting four skin molding sliding blocks 301 and 304 on the outer side of the molding prepreg of the skin 61;
seventhly, mounting the male die 6, enabling a pressure applying inclined plane II 64 in a male die edge groove 63 of the male die 6 to be matched with a pressure applying inclined plane I31 of the skin forming sliding block 3, and enabling a pressure applying inclined plane I62 of a male die groove 61 to be matched with a pressure applying inclined plane II 51 on the rib plate forming sliding block 5, and completing die assembly;
eighteen, after die assembly, moving the die to a hot press to complete the integral solidification of the grid reinforced structural member. Setting the heating rate of a press to be 2 ℃/min, heating to 300 ℃, setting the pressure to be 10Mpa, and maintaining the pressure for 5 h;
nineteen, after the solidification is finished, removing the prefabricated body to obtain the grid reinforced member, putting the prefabricated body into a carbonization furnace for carbonization, setting the temperature rise rate of the carbonization furnace to be 5 ℃/min, and raising the temperature to 1400 ℃ for heat preservation for 2 hours to obtain a porous member;
twenty, putting the porous body member into an infiltration furnace, setting the temperature of the infiltration furnace to be 10 ℃/min, heating to 1600 ℃, preserving the temperature for 1h, and carrying out melt siliconizing to prepare the dense ceramic matrix composite grid reinforced member, wherein the density of the member reaches 2.72g/cm3, and the porosity is lower than 4%.
By the technical scheme, uniform and sufficient forming pressure can be provided for the prepreg in the forming process; the prepreg can realize larger shrinkage along the thickness direction of the rib plate in the molding process; guarantee that the component is pressed everywhere evenly in the forming process, avoid the component to appear the shaping defect, avoid the forming process because the mould produces the shearing to preimpregnation material and cause the fibrous destruction to reinforced structure department, realized the whole shaping of component, guaranteed the shaping position and the thickness of net gusset through the shaping of branch simultaneously, effectively improved the shaping quality of this type of component when guaranteeing the component size.
Claims (10)
1. The utility model provides a ceramic matrix composite grid adds muscle component forming die, grid adds muscle component (1) component bottom is square or rectangular plane base (11), and plane base (11) are covering (12) around the four sides that form all around, and covering (12) four sides are inside to be cut apart into the grid unit by gusset (13) of orthogonal distribution, and the space in the grid unit forms a grid cell cube (14), the height and covering (12) parallel and level of gusset (13), its characterized in that: the mold comprises:
the female die (2), the female die (2) is used for processing a female die groove (21) on a metal blank according to the sizes of a plane base (11) and a skin (12) of the grid reinforcement member (1), flanges (22) are arranged around the female die groove (21), the flanges (22) respectively correspond to the four sides of the plane base (11), the length of each flange (22) is greater than the side length of the corresponding plane base (11), and the length difference is equal to two times of the thickness of the skin forming sliding block (3);
the skin forming sliding blocks (3) are rectangular metal blocks, a pressure-bearing inclined plane I (31) is processed at the top end of one long edge of each rectangular metal block and one side of each rectangular metal block along the long edge direction, the number of the skin forming sliding blocks (3) is four, the four skin forming sliding blocks respectively correspond to flanges (22) on the periphery of a female die groove (21), the length of each skin forming sliding block (3) is smaller than that of the corresponding flange (22), and the length difference is equal to the thickness of each skin forming sliding block (3);
the rib plate forming pressing strips (4) are rectangular metal blocks, the number of the rib plate forming pressing strips (4) is four, the rib plate forming pressing strips correspond to flanges (22) on the periphery of a female die groove (21), and the length of each rib plate forming pressing strip (4) is equal to the side length of a plane base (11) at the bottom of a corresponding grid reinforced component (1);
the rib plate forming sliding blocks (5) are in one-to-one correspondence with the grid units formed by dividing the rib plate (13), the lower parts of the rib plate forming sliding blocks (5) are in the same shape as the grid unit bodies (14) formed by dividing the rib plate (13), the upper parts of the rib plate forming sliding blocks (5) are higher than the upper edges of the rib plate (13), and two adjacent side surfaces of the upper parts of the rib plate forming sliding blocks (5) are processed into pressure bearing inclined surfaces II (51);
the male die (6) is characterized in that male die grooves (61) which correspond to grid unit bodies (14) divided by rib plates (13) in number, position and shape are machined in metal blanks, two adjacent side faces in each male die groove (61) are machined into pressing inclined planes I (62) which are matched with pressing inclined planes II (51) on corresponding rib plate forming sliding blocks (5), four male die side grooves (63) which correspond to skin forming sliding blocks (3) are machined in the periphery of the metal blanks of the male die (6) and are positioned on the outer sides of the male die grooves (61), and one side face in each male die side groove (63) is machined into a pressing inclined plane II (64) which is matched with the pressing inclined plane I (31) on the corresponding skin forming sliding block (3).
2. The ceramic matrix composite grid stiffened member forming mold of claim 1, wherein: the height of the upper part of the rib plate forming sliding block (5) higher than the upper edge of the rib plate (13) is 1.5-3 times of the height of the grid reinforced member (1).
3. The ceramic matrix composite grid stiffened member forming mold of claim 1, wherein: the included angle between the matching surface of the pressure applying inclined plane II (64) in the male die side groove (63) of the male die (6) and the pressure applying inclined plane I (31) of the skin forming slide block (3) and the horizontal direction is 20-70 degrees.
4. The ceramic matrix composite grid stiffened member forming mold of claim 1, wherein: the included angle between the matching surface of the pressure applying inclined plane I (62) of the male die groove (61) and the pressure applying inclined plane II (51) on the rib plate forming slide block (5) and the horizontal direction is 20-70 degrees.
5. The ceramic matrix composite grid stiffened member forming mold of claim 1, wherein: the opposite male mould grooves (61) in the male mould (6) are symmetrical along the centre line of the male mould (6).
6. The method for preparing the ceramic matrix composite grid reinforced member by adopting the forming die of claim 1, which is characterized in that: the method comprises the following steps:
step one, a first skin forming sliding block (301) is installed on the inner side surface of a flange (22), and a pressed inclined surface I (31) of the first skin forming sliding block (301) faces outwards during installation;
step two, mounting a first rib plate forming pressing strip (401) on the inner side face of the first skin forming sliding block (301);
step three, taking the direction vertical to the inner side surface of the first rib plate forming pressing strip (401) as the mounting direction of rib plate forming sliding blocks (5), selecting rib plate forming sliding blocks (5) with the same number as grid units in the direction, paving prepreg on five planes at the lower part of the rib plate forming sliding blocks (5), arranging the rib plate forming sliding blocks (5) along the direction, and completing the mounting of the rib plate forming sliding blocks (5) in the first row;
step four, repeating the step three, and finishing the installation of other rows of rib plate forming sliding blocks (5) which are parallel to the first row of rib plate forming sliding blocks (5);
fifthly, mounting a second rib plate forming pressing strip (402) at the other end of the row of rib plate forming sliding blocks (5) which are arranged;
sixthly, mounting a second skin forming sliding block (302) at the outer side of a second rib plate forming pressing strip (402);
seventhly, mounting a third rib plate forming pressing strip (403) and a third skin forming sliding block (303) below the rib plate forming sliding block (5) in the row vertical direction;
step eight, mounting a fourth rib plate forming pressing strip (404) and a fourth skin forming sliding block (304) on the rib plate forming sliding block (5) in the vertical direction;
mounting the male die (6), enabling a pressure applying inclined plane II (64) in a male die edge groove (63) of the male die (6) to be matched with a pressure applying inclined plane I (31) of the skin forming sliding block (3), enabling a pressure applying inclined plane I (62) of a male die groove (61) to be matched with a pressure applying inclined plane II (51) on the rib plate forming sliding block (5), completing die assembly, and moving to a hot press to complete rib plate solidification;
step ten, after the solidification is finished, removing the mold to take out the four skin forming sliding blocks (301-;
eleven, smearing or paving an adhesive on the periphery of the outer side of the grid rib plate blank, and paving a formed prepreg of the skin (12);
step twelve, mounting four skin molding sliding blocks (301 and 304) on the outer side of the prepreg of the molding skin (12);
and step thirteen, installing the male die (6), matching a pressure applying inclined plane II (64) in a male die edge groove (63) of the male die (6) with a pressure applying inclined plane I (31) of the skin forming sliding block (3), matching a pressure applying inclined plane I (62) of a male die groove (61) with a pressure applying inclined plane II (51) on the rib plate forming sliding block (5), completing die assembly, and moving to a hot press to complete the integral solidification of the grid reinforcing member (1).
7. The method for preparing a ceramic matrix composite grid reinforced member according to the forming die of claim 6, wherein: the prepreg and the molded prepreg of the skin (12) are silicon carbide fiber prepregs, carbon fiber prepregs or oxide fiber prepregs.
8. The method for preparing a ceramic matrix composite grid reinforced member according to the forming die of claim 6, wherein: the height of the rib plate forming sliding block (5) in each row in the rib plate forming sliding block (5) rows is reduced from the beginning end in sequence so as to realize the sequential compaction and shaping of the grid rib plates in the same row.
9. The method for preparing a ceramic matrix composite grid reinforced member according to the forming die of claim 6, wherein: the rib plate forming sliding blocks (5) are symmetrical along the center line of the female die (2), and the center line of the female die (2) is parallel to the installation direction of the rib plate forming sliding blocks (5).
10. The method for preparing a ceramic matrix composite grid reinforced member according to the forming die of claim 6, wherein: the adhesive comprises resin system slurry or a resin system adhesive film.
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| ES2384356T3 (en) * | 2008-10-31 | 2012-07-04 | Avio S.P.A. | Method for the production of components made of ceramic matrix composite material |
| US9663404B2 (en) * | 2012-01-03 | 2017-05-30 | General Electric Company | Method of forming a ceramic matrix composite and a ceramic matrix component |
| CN103434141B (en) * | 2013-08-15 | 2015-09-23 | 北京卫星制造厂 | The forming method of the box-like reinforced structure of a kind of carbon fibre composite |
| CN103804005B (en) * | 2013-11-25 | 2015-09-16 | 中航复合材料有限责任公司 | A kind of forming method of carbon/silicon carbide ceramic matrix composite inverted T-shaped section structural member |
| CN108501398B (en) * | 2018-03-16 | 2020-11-20 | 航天材料及工艺研究所 | Composite material shell containing inward flanging window, forming die and forming method |
| CN108407332B (en) * | 2018-03-23 | 2020-05-12 | 航天材料及工艺研究所 | Compression molding method for composite material grid skin structural part |
| CN108640698A (en) * | 2018-05-02 | 2018-10-12 | 中国航发北京航空材料研究院 | A kind of ceramic base composite material member co-curing moulding process |
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