CN114932692B - Braided structure composite material runner plate integrated RTM forming auxiliary tool and process - Google Patents
Braided structure composite material runner plate integrated RTM forming auxiliary tool and process Download PDFInfo
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- CN114932692B CN114932692B CN202210662373.XA CN202210662373A CN114932692B CN 114932692 B CN114932692 B CN 114932692B CN 202210662373 A CN202210662373 A CN 202210662373A CN 114932692 B CN114932692 B CN 114932692B
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- 238000003825 pressing Methods 0.000 claims abstract description 93
- 238000005056 compaction Methods 0.000 claims abstract description 17
- 238000000465 moulding Methods 0.000 claims description 58
- 229920005989 resin Polymers 0.000 claims description 11
- 239000011347 resin Substances 0.000 claims description 11
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- 238000002955 isolation Methods 0.000 claims description 4
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- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000011157 advanced composite material Substances 0.000 description 2
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- 239000007788 liquid Substances 0.000 description 2
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- 229920000271 Kevlar® Polymers 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/345—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using matched moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/76—Cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
- B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to an integrated RTM forming auxiliary tool for a composite material runner plate with a woven structure, which comprises a pressing block A, a pressing block B, a pressing block C, a pressing block D, a pressing block E, end stop blocks, side stop blocks and a compacting die base; the compaction die base is used for placing a forming die core die wrapped by the runner plate woven preform, and the pressing blocks A and B are respectively positioned at the left end and the right end of the runner plate woven preform and used for extruding the left end face and the right end face; the pressing blocks C and D are respectively used for being connected with the end stop block and compacting the left flanging and the right flanging of the runner plate woven prefabricated body, and the pressing block E is used for being connected with the end stop block and compacting the top of the core mould covered with the left flanging and the right flanging. The invention also relates to an integrated RTM forming tool and process for the composite material runner plate with the woven structure. The aim of the integrated RTM forming auxiliary tool and the process for the composite material runner plate with the woven structure is to solve the problem that the integrated RTM forming of the runner plate with the complex box section structure is easy to have dense holes.
Description
Technical Field
The invention relates to the technical field of composite material liquid forming, in particular to an integrated RTM forming auxiliary tool and process for a composite material runner plate with a woven structure.
Background
With the wide application of composite materials in various industries, the durability design and damage tolerance design of the materials are getting more and more attention. The traditional laminated structure composite material has weak interlayer strength, low toughness and easy delamination after being impacted, and obviously reduces the damage tolerance and design allowable value of the composite material structure, so that the advantages of high weight reduction efficiency of the composite material are difficult to fully play in structural design.
The composite material with the woven structure is an integral structure formed by interweaving warp and weft yarns in space, has omnibearing enhancement in the thickness direction and the transverse direction, can greatly improve the interlaminar shear strength, the impact resistance and the damage tolerance of the material, and can well meet the current requirements of aerospace, particularly the field of aeroengines, on the low weight and high performance of the advanced composite material.
Therefore, the inventor provides an integrated RTM molding auxiliary tool and process for the composite material runner plate with the braided structure.
Disclosure of Invention
(1) Technical problem to be solved
The embodiment of the invention provides an integrated RTM forming auxiliary tool and process for a composite material runner plate with a woven structure, which solve the technical problem that the integrated RTM forming of the runner plate with a complex box section structure is easy to have dense holes.
(2) Technical proposal
The invention provides an integrated RTM forming auxiliary tool for a composite material runner plate with a woven structure, which is a compacting die and comprises a pressing block A, a pressing block B, a pressing block C, a pressing block D, a pressing block E, end stop blocks, side stop blocks and a compacting die base;
the compaction die base is used for placing a forming die core die wrapped by the runner plate woven preform, and the pressing block A and the pressing block B are respectively positioned at the left end and the right end of the runner plate woven preform and used for extruding the left end face and the right end face;
the pressing block C is used for being connected with the end stop block and compacting the left flanging of the runner plate woven preform, the pressing block D is used for being connected with the end stop block and compacting the right flanging of the runner plate woven preform, and the pressing block E is used for being connected with the end stop block and compacting the top of the core mold covered with the left flanging and the right flanging;
the two side limit check blocks are respectively attached to the pressing block A and the pressing block B and used for extruding the pressing block A and the pressing block B.
Further, the pressing block A and the pressing block B are wedge-shaped.
Further, the compacting die further comprises small pressing blocks, wherein the small pressing blocks are respectively arranged on the upper end faces of the pressing blocks A and B and used for enabling the pressing blocks A and B to be flush with the side limit stop blocks.
The invention also provides an integrated RTM forming tool for the composite material runner plate with the woven structure, which comprises a forming die core die, a fabric layer, a forming die lower die, a forming press block and the compacting die; wherein,,
the forming die core die is positioned in the middle of the forming die lower die and used for being wrapped by the runner plate woven preform, and the fabric layer is laid between the forming die core die and the forming die lower die;
the compaction die is used for compacting the runner plate woven preform, and the forming press block is covered on the forming die core die and used for compacting the runner surface of the runner plate woven preform.
Further, the forming die core mold is of a split type structure.
The invention also provides an integrated RTM forming process of the composite material runner plate with the woven structure, which comprises the following steps:
and step 3, assembling an upper die of the forming die with a lower die of the forming die, injecting resin into the forming die, and completing the curing and forming of the composite material runner plate with the woven structure according to a resin curing process.
Further, before step S1, assembling each core mold into the molding die core mold 3, and laying an isolation layer on the surface of the molding die core mold.
Further, in step S1, a yarn subtracting line for positioning the core mold of the forming mold is provided at the boundary of the core mold placement area of the runner plate woven preform.
Further, in step S1, the runner plate woven preform is provided with an indication line corresponding to the score line on the compacting die 5.
And further, after the solidification is finished, taking the composite material runner plate with the braided structure and the core mould of the forming mould out of the forming mould, and sequentially extracting the core blocks according to the drawing order to finish demoulding of the runner plate.
(3) Advantageous effects
In summary, the RTM forming process of the runner plate woven preform is controlled through the plurality of pressing blocks, so that all the surfaces of the runner plate woven preform can be fully compacted before die assembly, the thickness uniformity of all the surfaces of the runner plate made of the composite material with the woven structure is ensured, and meanwhile, the holes generated in the RTM forming process of the runner plate can be reduced through the full compaction of the runner plate woven preform, and the forming quality is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
FIG. 1 is a schematic structural view of a composite flow field plate of braided construction;
FIG. 2 is a schematic view of the structure of a flow field plate woven preform;
fig. 3 is a schematic structural view of a molding die core according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view taken along the A-A plane in FIG. 3;
FIG. 5 is a cross-sectional view taken along the B-B plane in FIG. 3;
FIG. 6 is a schematic diagram illustrating an assembly of a flow field plate woven preform and a molding die core mold according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a structure of left flanging prepressing of a runner plate woven preform according to an embodiment of the present invention;
FIG. 8 is a cross-sectional view taken along the C-C plane in FIG. 7;
FIG. 9 is a D-D sectional view of FIG. 7;
FIG. 10 is a cross-sectional view taken along the E-E plane in FIG. 7;
FIG. 11 is a schematic diagram of a structure of a right flanging precompression of a runner plate woven preform according to an embodiment of the present invention;
FIG. 12 is a cross-sectional view taken along the plane F-F in FIG. 11;
FIG. 13 is a cross-sectional view of the G-G plane of FIG. 11;
FIG. 14 is a cross-sectional view of the H-H plane of FIG. 11;
FIG. 15 is a schematic view of a structure of top surface pre-pressing of a woven preform for a flow conduit plate according to an embodiment of the present invention;
FIG. 16 is a cross-sectional view taken along the plane I-I of FIG. 15;
FIG. 17 is a J-J section view of FIG. 15;
FIG. 18 is a cross-sectional view taken along the plane K-K in FIG. 15;
FIG. 19 is a schematic view showing a structure in which a flow surface of a flow field plate woven preform is pre-pressed in a lower mold of a molding mold according to an embodiment of the present invention;
FIG. 20 is a cross-sectional view taken along the L-L plane in FIG. 19.
In the figure:
1-a composite material runner plate; 101-top surface of runner plate; 102-runner plate runner face; 103-left side face of runner plate; 104-the right side surface of the runner plate; 105-the front end of the flow channel plate; 106, the rear end of the runner plate; 107-left airfoil of the flow channel plate; 108-a right airfoil of the runner plate; 2-braiding a prefabricated body by a runner plate; 201-left flanging; 202-flanging right; 203-mandrel placement area; 204-trace line; 205-subtracting yarn; 3-forming a mould core mould; 4-a fabric layer; 5-compacting the mould; 501-briquetting A; 502-briquetting B; 503-briquetting C; 504-briquetting D; 505-briquetting E; 506-front and rear end stops; 507-side stops; 508-small briquettes; 509-a gap portion; 510-compacting the mold base; 6, forming a lower die of the die; 7, forming a pressing block.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, substitutions and improvements in parts, components and connections without departing from the spirit of the invention.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Resin transfer molding (RTM, resin Transfer Molding) is a process of impregnating reinforcing materials and curing and molding by injecting a liquid resin into a closed mold, and is a molding process developed in recent years to be rapidly suitable for the production of various, medium-batch, high-quality advanced composite material products, which is a production method of parts approaching the final shape, and basically requires no subsequent processing.
Fig. 1 is a schematic structural diagram of an integrated RTM molding auxiliary tool for a composite material runner plate with a woven structure, which is provided by the embodiment of the present invention, and the auxiliary tool is a compaction mold 5, and may include a press block a501, a press block B502, a press block C503, a press block D504, a press block E505, an end stop 506, a side stop 507, and a compaction mold base 510;
the compacting die base 510 is used for placing a forming die core die 3 wrapped by the runner plate woven preform 2, and the pressing blocks A501 and B502 are respectively positioned at the left end and the right end of the runner plate woven preform 2 and used for extruding the left end face and the right end face;
the pressing block C503 is used for being connected with the end block 506 and compacting the left flanging of the runner plate woven preform 2, the pressing block D504 is used for being connected with the end block 506 and compacting the right flanging of the runner plate woven preform 2, and the pressing block E505 is used for being connected with the end block 506 and compacting the top of the forming die core mold 3 covered with the left flanging and the right flanging;
the two side stoppers 507 are respectively attached to the press blocks a501 and B502 and are used for pressing the press blocks a501 and B502.
In the above embodiment, the runner plate woven preform 2 is wrapped around the molding die core 3 and transferred to the compacting die base 510 together, and the runner face boundary of the preform is trimmed by pressing the solid die base 510 boundary; turning up the left and right flanges of the prefabricated body along the core mould respectively to enable the left and right flanges to be fully contacted with the left side surface and the right side surface of the core mould, putting down a pressing block A501 and a pressing block B502 of the compacting mould, assembling an upper end stop block 506 and screwing bolts of the end stop block 506; four small press blocks on the press block A501 and the press block B502 are screwed down, so that the press block A501 and the press block B502 are flush with side stop blocks 507 of the compacting die. Pressing down the left flanging of the preform to enable the left flanging to be fully contacted with the top surface of the molding die core mold 3, putting down the pressing block C503, screwing up a connecting bolt between the pressing block C503 and the end stop 506, fully compacting the left flanging of the preform, and cutting the left flanging along the boundary of the pressing block C503; taking down the pressing block C503, pressing down the right flanging of the preform, enabling the right flanging to be fully contacted with the top surface covered with the left flanging, putting down the pressing block D504 of the pre-pressing die, screwing down a connecting bolt between the pressing block D504 and the end stop 506, fully compacting the right flanging of the preform, and cutting the right flanging along the boundary of the pressing block D504; and taking down the pressing block D504, putting down the pressing block E505 of the pre-pressing die, screwing down a connecting bolt between the pressing block E505 and the end stop 506, and compacting the top of the core mould covered with the left flanging and the right flanging for not less than 1h.
As shown in fig. 1, since the flow channel plate has a three-sided closed box section structure with curvature, the size of the cavity gradually increases from the closed front end to the open rear end.
Specifically, since the molding die core 3 is a movable module wrapped in the runner plate woven preform 2, the force cannot be well transmitted and maintained, and the pressing of the opposite face is performed by applying pressure on one face thereof, the situation that the direct pressing side is over-pressed and the pressing side cannot be pressed to the theoretical position through the core is liable to occur. The compaction tool 5 is therefore designed to precompacte the various faces of the flow-plate woven preform 2. In order to ensure that the faces of the runner plate woven preform 2 can be sufficiently compacted, the press blocks a501 and B502 are designed to be wedge-shaped, and the left and right sides of the runner plate can be sufficiently compacted in the pressing process. In order to sufficiently compact both wing surfaces of the flow channel plate preform, the portions of the four small compacts 508 for applying pressure to the compacts a501 and B502 above the compacts a501 and B502 may be 0.3mm to 0.5mm thicker than the portions thereof above the side stoppers 507; similarly, a gap 509 is reserved between the molded surfaces of the bolt connection positions of the pressing blocks C503, D504 and E505 and the end stop 506, wherein the depth range of the gap 509 is 0.3-0.5 mm, and the left flanging and the right flanging of the prefabricated body and the top surface of the runner plate formed by the left flanging and the right flanging are ensured to be fully compacted.
As an alternative embodiment, as shown in fig. 8, the compacts a501 and B502 are wedge-shaped. Wherein, the wedge-shaped pressing block can ensure the sufficient compaction between the wedge-shaped pressing block and the left side edge and the right side edge of the runner plate woven prefabricated body 2.
As an alternative embodiment, as shown in fig. 7, the compacting mold further includes a small press block 508, where the small press block 508 is respectively disposed on the upper end surfaces of the press blocks a501 and B502 and is used to make the press blocks a501 and B502 flush with the side stoppers 507.
Specifically, the small press blocks 508 are configured to press the press blocks a501 and B502 against the runner plate woven preform 2, and the number of the small press blocks 508 may be four, and one small press block 508 is respectively disposed at the front end and the rear end of the press block a501 and the press block B502.
Fig. 6, 19 and 20 are schematic structural diagrams of an integrated RTM molding tool for a composite material runner plate with a woven structure according to an embodiment of the present invention, where the molding tool may include a molding die core mold 3, a fabric layer 4, a molding die lower mold 6, a molding press block 7 and the compacting die 5 described above; wherein,,
the forming die core die 3 is positioned in the middle of the forming die lower die 6 and is used for being wrapped by the runner plate woven preform 2, and the fabric layer 4 is paved between the forming die core die 3 and the forming die lower die 6;
the compaction die 5 is used for compacting the runner plate woven preform 2, and the forming press block 7 is covered on the forming die core die 3 and is used for compacting the runner surface of the runner plate woven preform 2.
As an alternative embodiment, as shown in fig. 3 to 5, the molding die core 3 is of a split type structure. The flow channel plate is of a three-face closed box section structure with curvature, the size of the cavity gradually increases from the closed front end to the open rear end, and in order to enable the molding die core mold 3 to be smoothly demolded after being solidified, the molding die core mold 3 needs to be of a block design.
The embodiment of the invention also provides an integrated RTM forming process of the composite material runner plate with the braided structure, which can comprise the following steps:
s100, wrapping the runner plate woven preform 2 on a forming die core mold 3 and placing the forming die core mold in a compacting die base 510, and trimming the runner surface boundary of the preform according to the base boundary of a compacting die 5;
s200, taking down the compaction mold 5, taking out the compacted runner plate woven preform 2 together with the molding mold core mold 3, and placing the preform in the lower molding mold 6; compressing the molding die core mold 3 and the runner plate woven preform 2 to a theoretical position in a molding die by using a molding press block 7, and then taking down the molding press block 7;
s300, assembling an upper die of the forming die with a lower die 6 of the forming die, injecting resin into the forming die, and completing the curing and forming of the composite material runner plate of the woven structure according to a resin curing process.
In the above embodiment, since the right turn-up fracture of the runner plate woven preform 2 occurs on the top surface of the runner plate, the loose fibers at the fracture edge may cause poor apparent quality of the runner plate after curing, so that a layer of fabric of the same material as the runner plate woven preform 2 is laid in advance on the lower mold 6 of the forming mold, and then the compacted preform is put into the lower mold together with the core mold. In addition, in order to ensure that the runner surface of the runner plate is fully compacted, the molded surface at the bolt joint of the molding press block 7 and the lower die can be thinned by 0.3-0.5 mm compared with the theoretical molded surface.
As an alternative embodiment, before step S100, it further includes assembling each core mold into a molding die core mold 3, and laying an isolation layer on the surface of the molding die core mold 3. Specifically, during molding, the core blocks are required to be bonded together in advance by glue with short curing time, such as 502 glue and the like, which is cured at normal temperature.
As an alternative embodiment, in step S100, the boundary of the core mold placement area of the runner plate woven preform 2 is provided with a yarn subtracting for positioning the molding die core mold 3.
Specifically, as shown in fig. 2, since the thickness of the runner face of the runner plate woven preform 2 is not identical to the thickness of the two wings in the core mold placement region, a yarn reducing yarn 205 is designed at the boundary of the core mold placement region of the runner plate woven preform 2, and the molding die core mold 3 can be positioned into the runner plate woven preform 2 in accordance with the contour of the yarn reducing yarn 205.
As an alternative embodiment, in step S100, the runner plate woven preform 2 is provided with an indication corresponding to the score line on the compaction tool 5.
Specifically, as shown in fig. 2, the runner plate woven preform 2 is further designed with a trace 204, which corresponds to the score line on the compacting die 5, so that the forming die core 3 wrapped by the runner plate woven preform 2 is conveniently positioned in the compacting die 5; the trace 204 is a fiber of a different color than the preform and may be a fiberglass or kevlar fiber or the like.
As an alternative embodiment, after curing is completed, the composite material runner plate with the woven structure and the molding die core 3 are taken out from the molding die, and then the core blocks are sequentially pulled out according to the die pulling sequence, so that the runner plate demoulding is completed.
Example 1
Preparing a XX engine braided composite material runner plate, adopting a CCF800 carbon fiber braided integrated runner plate preform, adopting Actech1304 epoxy resin to carry out RTM molding resin permeation, adopting the RTM molding technology of the invention, and specifically comprising the following steps:
1) The structure of the runner plate 1 is shown in fig. 1, and is a three-face closed box section structure with curvature, the size of a cavity gradually increases from a closed front end 105 to an open rear end 106, and a molding die core mold 3 is divided into 6 blocks in a block design; when in molding, a little 502 glue is coated on the non-working surface of the core mold, so that the core mold and the non-working surface are bonded together until no obvious step difference exists at the joint. Laying isolation materials outside the core mold;
2) Placing the forming die core mold 3 between two yarn reducing yarns 205 of the runner plate woven preform 2, so that two boundaries of the core mold are overlapped with the yarn reducing yarns 205 at two sides; transferring the preform together with the core mold into the base 510 of the compacting mold 5, and trimming the boundary of the runner plate runner face 102 of the preform by pressing the boundary of the base 510 of the compacting mold; turning up the left side 103 and the right side 104 of the runner plate along the core mold respectively to enable the left and right turned edges to fully contact the left and right sides of the core mold, putting down the pressing block A501 and the pressing block B502, assembling the upper rear end stop block 506 and screwing the rear end stop block bolt; four small pressing blocks 508 on the pressing blocks A501 and B502 are screwed down, so that the pressing blocks A501 and B502 are flush with the side stop blocks 507, and the left wing surface 107 and the right wing surface 108 of the flow passage plate are compacted; the pressing block A501 and the pressing block B502 are of wedge-shaped structures, and the left side surface 103 and the right side surface 104 of the runner plate are fully compacted in the pressing process.
7-10, the left flanging of the preform is pressed down to be fully contacted with the top surface of the core mold, the pressing block C503 is put down, the connecting bolt of the pressing block C503 and the front and rear end blocks is screwed down, and the molded surface of the connecting part of the pressing block C503 and the front and rear end bolts is 0.3-0.5 mm thinner than the theoretical molded surface, so that the left flanging of the preform can be pressed by 0.3-0.5 mm in the screwing process, the left flanging is fully compacted, and the left flanging is cut along the boundary of the pressing block C503.
As shown in fig. 11-14, the press block C503 is removed, the right flange of the preform is pressed down, the right flange is fully contacted with the top surface covered with the left flange, the press block D504 of the pre-pressing mold is put down, the connecting bolts of the press block D504 and the front and rear end blocks are screwed down, and similarly, the right flange of the preform can be fully compacted, and the right flange is cut along the boundary of the press block D504.
15-18, the press block D504 is removed, the pre-pressing die press block E505 is put down, the press block E505 and the front and rear end block connecting bolts are screwed down, the top of the core mold covered with the left flanging and the right flanging is compacted for not less than 1h, and the top surface 101 of the runner plate can be fully compacted in the same way.
3) Paving a layer of CF8611 carbon fiber fabric 4 on the lower die 6 of the forming die, wherein the paving direction is 0 DEG/90 DEG, taking down the compacting die pressing block E505, taking out the compacted preform together with the core die and placing the preform in the lower die of the forming die; the forming press block 7 is used for compressing the core mold and the prefabricated body to the theoretical position in the forming mold, the molded surface at the joint of the forming press block 7 and the lower mold bolt is 0.3-0.5 mm thinner than the theoretical molded surface, the runner plate runner surface 102 is pressed by 0.3-0.5 mm in the bolt screwing process, the forming press block 7 is fully compacted, and then the forming press block 7 is taken down;
4) And assembling the upper half mould and the lower half mould of the RTM forming mould, completing resin injection and curing according to the technological parameters of Actech1304 epoxy resin, opening the mould after curing is completed, taking out the woven composite material runner plate with the core mould, and sequentially extracting the core blocks according to the mould extracting sequence by using a mould extractor to obtain the Actech1304 epoxy resin/CCF 800 woven composite material runner plate.
It should be understood that, in the present specification, each embodiment is described in an incremental manner, and the same or similar parts between the embodiments are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. The invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known method techniques is omitted here for the sake of brevity.
The foregoing is merely an example of the present application and is not limited to the present application. Various modifications and alterations of this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (10)
1. The integrated RTM forming auxiliary tool for the composite material runner plate with the woven structure is characterized by comprising a compaction die (5), wherein the compaction die comprises a pressing block A (501), a pressing block B (502), a pressing block C (503), a pressing block D (504), a pressing block E (505), an end stop block (506), a side stop block (507) and a compaction die base (510);
the compaction mold base (510) is used for placing a molding mold core mold (3) wrapped by the runner plate woven preform (2), and the pressing block A (501) and the pressing block B (502) are respectively positioned at the left end and the right end of the runner plate woven preform (2) and used for extruding the left end face and the right end face;
the pressing block C (503) is used for being connected with the end stop block (506) and compacting the left flanging of the runner plate woven preform (2), the pressing block D (504) is used for being connected with the end stop block (506) and compacting the right flanging of the runner plate woven preform (2), and the pressing block E (505) is used for being connected with the end stop block (506) and compacting the top of the core mold covered with the left flanging and the right flanging;
two side stoppers (507) are respectively attached to the pressing block A (501) and the pressing block B (502) and are used for extruding the pressing block A (501) and the pressing block B (502).
2. The integrated RTM molding auxiliary tool for a composite material runner plate with a woven structure according to claim 1, wherein the pressing block a (501) and the pressing block B (502) are wedge-shaped.
3. The integrated RTM molding auxiliary tool for a composite material runner plate with a woven structure according to claim 1 or 2, further comprising a small press block (508), wherein the small press block (508) is respectively arranged on the upper end surfaces of the press block a (501) and the press block B (502) and is used for enabling the press block a (501) and the press block B (502) to be flush with the side stop block (507).
4. A braided structure composite material runner plate integrated RTM forming tool, characterized by comprising a forming mold core mold (3), a fabric layer (4), a forming mold lower mold (6), a forming press block (7) and a compacting mold (5) according to any one of claims 1-3; wherein,,
the forming die core die (3) is positioned in the middle of the forming die lower die (6) and is used for being wrapped by the runner plate woven preform (2), and the fabric layer (4) is paved between the forming die core die (3) and the forming die lower die (6);
the compaction die (5) is used for compacting the runner plate woven preform (2), and the forming press block (7) is covered on the forming die core die (3) and is used for compacting the runner surface of the runner plate woven preform (2).
5. The integrated RTM molding tool for a composite material runner plate with a woven structure according to claim 4, wherein the molding die core mold (3) is of a split structure.
6. The integrated RTM forming process for the composite material runner plate with the woven structure is characterized by comprising the following steps of:
step 1, wrapping a runner plate woven preform (2) on a forming die core die (3) and placing the preform in a compacting die base (510), and trimming the boundary of the runner surface of the preform according to the base boundary of a compacting die (5);
step 2, taking down the compaction mould (5), taking out the compacted runner plate woven preform (2) together with the forming mould core mould (3) and placing the preform in a forming mould lower mould (6); compressing the molding die core die (3) and the runner plate woven preform (2) to theoretical positions in a molding die by using a molding press block (7), and then taking down the molding press block (7);
and 3, assembling an upper die of the forming die with a lower die (6) of the forming die, injecting resin into the forming die, and completing the solidification forming of the composite material runner plate of the braided structure according to a resin solidification process.
7. The integrated RTM molding process for a composite runner plate of a braided structure according to claim 6, further comprising assembling each core mold into the molding die core mold (3) and laying an isolation layer on the surface of the molding die core mold (3) before step S1.
8. The integrated RTM molding process for a composite runner plate of a braided structure according to claim 6, wherein in step S1, a boundary of a core mold placement area of the runner plate braided preform (2) is provided with a yarn subtracting for positioning the molding die core mold (3).
9. The integrated RTM molding process for a composite runner plate with a knitted structure according to claim 6 or 8, wherein in step S1, the runner plate knitted preform (2) is provided with an indication line corresponding to the score line on the compacting mold (5).
10. The integrated RTM molding process for a composite material runner plate with a woven structure according to claim 6, wherein after curing is completed, the composite material runner plate with the woven structure and the molding die core (3) are taken out from the molding die, and then the core blocks are sequentially pulled out in a die pulling order, thereby completing the demolding of the runner plate.
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| CN101698326A (en) * | 2009-10-28 | 2010-04-28 | 中国人民解放军国防科学技术大学 | Fiber reinforced preform for resin transfer molding (RTM) process, and composite material member and preparation method thereof |
| CN106626434A (en) * | 2016-11-29 | 2017-05-10 | 中国航空工业集团公司沈阳飞机设计研究所 | Method for manufacturing and designing composite material bulkhead structure of airplane |
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| DE102010014704A1 (en) * | 2010-04-12 | 2011-10-13 | Brötje-Automation GmbH | Method and device for producing preforms made of fiber-reinforced plastic |
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| CN101698326A (en) * | 2009-10-28 | 2010-04-28 | 中国人民解放军国防科学技术大学 | Fiber reinforced preform for resin transfer molding (RTM) process, and composite material member and preparation method thereof |
| JP2017154384A (en) * | 2016-03-02 | 2017-09-07 | 三豊化成株式会社 | Method for producing molded article |
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