CN114932692A - Integrated RTM (resin transfer molding) auxiliary tool and process for composite material runner plate with woven structure - Google Patents
Integrated RTM (resin transfer molding) auxiliary tool and process for composite material runner plate with woven structure Download PDFInfo
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- CN114932692A CN114932692A CN202210662373.XA CN202210662373A CN114932692A CN 114932692 A CN114932692 A CN 114932692A CN 202210662373 A CN202210662373 A CN 202210662373A CN 114932692 A CN114932692 A CN 114932692A
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- 239000011347 resin Substances 0.000 title claims abstract description 22
- 238000001721 transfer moulding Methods 0.000 title claims abstract description 12
- 238000003825 pressing Methods 0.000 claims abstract description 129
- 238000005056 compaction Methods 0.000 claims abstract description 40
- 238000000465 moulding Methods 0.000 claims description 11
- 239000004744 fabric Substances 0.000 claims description 9
- 238000009966 trimming Methods 0.000 claims description 4
- 238000009745 resin transfer moulding Methods 0.000 claims 3
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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
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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
- B29C70/54—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 (resin transfer molding) 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, an end stop block, a side stop block and a compaction die base, wherein the pressing block A is a pressing block B; 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 are used for extruding the left end surface and the right end surface; the pressing block C and the pressing block D are respectively used for being connected with the end stop block and enabling the runner plate to be compacted through a left flanging and a right flanging of the prefabricated body, 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 invention also relates to an integrated RTM (resin transfer molding) forming tool and process for the composite material runner plate with the woven structure. The integrated RTM forming auxiliary tool and process for the composite material flow channel plate with the woven structure aim to solve the problem that pores are dense and are easy to occur in the integrated RTM forming of the flow channel plate with a complex box section structure.
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 design of durability and damage tolerance of materials are more and more important. The traditional composite material with the laminated structure has weak interlayer strength and low toughness, is easy to delaminate after being impacted, and obviously reduces the damage tolerance and the design allowable value of the composite material structure, so that the advantage of high weight-reducing efficiency of the composite material is difficult to be fully exerted in the structural design.
The woven structure composite material is an integral structure formed by interweaving warp and weft yarns in space, has omnibearing reinforcement in the thickness direction and the transverse direction, can greatly improve the interlaminar shear strength, the shock resistance and the damage tolerance of the material, and can well meet the requirements of current aerospace, particularly the field of aeroengines on the low weight and high performance of advanced composite materials.
Therefore, the inventor provides an integrated RTM forming auxiliary tool and process for a composite material runner plate with a woven structure.
Disclosure of Invention
(1) Technical problem to be solved
The embodiment of the invention provides an integrated RTM (resin transfer molding) auxiliary tool and an integrated RTM auxiliary process for a composite material flow channel plate with a woven structure, which solve the technical problem of dense pores which are easily caused by the integrated RTM of the flow channel plate with a complex box section structure.
(2) Technical scheme
The invention provides an integrated RTM (resin transfer molding) auxiliary tool for a composite material runner plate with a braided structure, which is a compaction die and comprises a pressing block A, a pressing block B, a pressing block C, a pressing block D, a pressing block E, an end stop block, a side stop block and a compaction die base, wherein the pressing block A is a pressing block B;
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 are used for extruding the left end surface and the right end surface;
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 stop 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.
Furthermore, the compaction die further comprises small press blocks, wherein the small press blocks are respectively arranged on the upper end faces of the press block A and the press block B and are used for enabling the press block A and the press block B to be flush with the side limit stop blocks.
The invention also provides an integrated RTM (resin transfer molding) 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 pressing block and the compacting die; wherein,
the forming die core die is positioned in the middle of the forming die lower die and is 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 mould is used for compacting the runner plate woven preform, and the forming pressing block cover is arranged on the forming mould core mould and used for compacting the runner surface of the runner plate woven preform.
Further, the forming die core mold is of a split structure.
The invention also provides an integrated RTM (resin transfer molding) process for the composite material runner plate with the woven structure, which comprises the following steps of:
and 3, assembling an upper die of the forming die with a lower die of the forming die, injecting resin into the forming die, and finishing the curing and forming of the composite material runner plate with the braided structure according to a resin curing process.
Further, before step S1, the method further includes assembling the core molds into the forming mold core mold 3, and laying a release layer on the surface of the forming mold core mold.
Further, in step S1, the boundary of the core mold placement region of the runner plate woven preform is provided with a yarn reducing thread for positioning the core mold of the molding die.
Further, in step S1, the runner plate woven preform is provided with a marking line corresponding to the marking line on the compaction mold 5.
Further, after the curing is finished, the runner plate made of the composite material with the woven structure and the forming die core die are taken out of the forming die, and then the core blocks are sequentially pulled out according to the die pulling sequence, so that the demolding of the runner plate is finished.
(3) Advantageous effects
In conclusion, the RTM forming process of the runner plate woven preform is controlled by the plurality of press blocks, so that each surface of the runner plate woven preform can be fully compacted before die assembly, the thickness uniformity of each surface of the composite runner plate with the woven structure is ensured, meanwhile, the full compaction of the runner plate woven preform can reduce pores generated in the RTM forming process of the runner plate, 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 needed to be used 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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural view of a composite runner plate of a woven structure;
FIG. 2 is a schematic structural view of a woven preform of a runner plate;
fig. 3 is a schematic structural view of a core mold of a forming mold according to an embodiment of the present invention;
FIG. 4 is a sectional view taken along the line A-A in FIG. 3;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 3;
fig. 6 is an assembly view of a runner plate woven preform and a core mold of a molding die according to an embodiment of the present invention;
fig. 7 is a schematic structural view of prepressing of the left turned edge of a runner plate woven preform according to an embodiment of the present invention;
FIG. 8 is a cross-sectional view taken along the plane C-C of FIG. 7;
FIG. 9 is a cross-sectional view taken along plane D-D of FIG. 7;
FIG. 10 is a cross-sectional view taken along plane E-E of FIG. 7;
fig. 11 is a structural schematic diagram of right flanging prepressing of a runner plate woven preform provided in an embodiment of the present invention;
FIG. 12 is a sectional view taken along plane F-F of FIG. 11;
FIG. 13 is a sectional view taken along the plane G-G in FIG. 11;
FIG. 14 is a sectional view taken along the plane H-H in FIG. 11;
FIG. 15 is a schematic structural view of prepressing the top surface of a woven preform of a runner plate according to an embodiment of the present invention;
FIG. 16 is a cross-sectional view taken along the plane I-I in FIG. 15;
FIG. 17 is a sectional view taken along the plane J-J in FIG. 15;
FIG. 18 is a cross-sectional view taken along plane K-K of FIG. 15;
FIG. 19 is a schematic structural view of a runner plate woven preform runner surface being pre-pressed in a lower mold of a forming mold according to an embodiment of the present invention;
fig. 20 is a sectional view taken along the L-L plane in fig. 19.
In the figure:
1-a composite runner plate; 101-flow channel plate top surface; 102-a flow channel plate flow channel face; 103-left side of the flow passage plate; 104-right side of flow channel plate; 105-flow channel plate front end; 106-flow channel plate back end; 107-flow field plate left airfoil; 108-flow field plate right airfoil; 2-weaving the prefabricated body by the runner plate; 201-left flanging; 202-right flanging; 203-mandrel placement zone; 204-trace; 205-reduction of the yarn; 3-forming a mold core; 4-a fabric layer; 5-compacting the mould; 501-briquetting A; 502-briquetting B; 503-briquetting C; 504-briquetting D; 505-Block E; 506-front and rear end stops; 507-side stop blocks; 508-small briquettes; 509-a gap portion; 510-compacting the mould base; 6-forming a lower die of the die; 7-forming and briquetting.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the 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, alterations, and improvements in the parts, components, and connections without departing from the spirit of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Resin Transfer Molding (RTM) is a process of injecting a liquid Resin into a closed mold to impregnate a reinforcing material and cure the Resin, and is a Molding process developed in recent years that is rapidly suitable for the production of advanced composite products of various types, medium-volume, and high quality, and is a production method of parts close to final shapes, substantially without subsequent processing.
Fig. 1 is a schematic structural diagram of an integrated RTM forming auxiliary tool for a composite material flow channel plate with a woven structure according to an embodiment of the present invention, the auxiliary tool is a compaction mold 5, which may include a pressing block a501, a pressing block B502, a pressing block C503, a pressing block D504, a pressing block E505, an end stop 506, a side stop 507, and a compaction mold base 510;
the compaction die base 510 is used for placing the forming die core die 3 wrapped by the runner plate woven preform 2, and the pressing block a501 and the pressing block 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 surface and the right end surface;
a press block C503 for connecting with the end stopper 506 and compacting the left turned edge of the runner plate woven preform 2, a press block D504 for connecting with the end stopper 506 and compacting the right turned edge of the runner plate woven preform 2, and a press block E505 for connecting with the end stopper 506 and compacting the top of the forming die core 3 covered with the left and right turned edges;
the two side edge stoppers 507 are respectively attached to the pressing block A501 and the pressing block B502 and used for pressing the pressing block A501 and the pressing block B502.
In the above embodiment, the runner plate woven preform 2 is wrapped around the core mold 3 of the molding die, and transferred together into the base 510 of the compaction die, and the boundary of the runner surface of the preform is trimmed by pressing the boundary of the base 510 of the compaction die; respectively turning up the left and right turned edges of the prefabricated body along the core mold to make the left and right turned edges fully contact with the left and right side surfaces of the core mold, putting down a pressing block A501 and a pressing block B502 of a compaction mold, assembling an upper end stop 506 and screwing down a bolt of the end stop 506; and tightening the four small press blocks on the press block A501 and the press block B502 to enable the press block A501 and the press block B502 to be level with the side stop block 507 of the compaction die. Pressing down the left turned edge of the prefabricated body to make the left turned edge fully contact with the top surface of the core mold 3 of the forming mold, putting down a pressing block C503, screwing down a connecting bolt between the pressing block C503 and an end stop block 506 to make the left turned edge of the prefabricated body fully compacted, and cutting the left turned edge along the boundary of the pressing block C503; taking down the pressing block C503, pressing down the right flanging of the prefabricated body to enable 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 part stop block 506 to enable the right flanging of the prefabricated body to be fully compacted, 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 prepressing die, tightening a connecting bolt between the pressing block E505 and the end stop 506, and compacting the top of the core die covered with the left flanging and the right flanging for not less than 1 h.
As shown in fig. 1, since the flow field plate has a three-sided closed box section structure with curvature, it gradually becomes larger in size from a closed front end to an open rear end.
Specifically, since the core mold 3 of the forming mold is a movable mold which is wrapped in the flow path plate woven preform 2 and cannot transmit and maintain an acting force well, it is easy to cause a situation in which the side directly pressed is over-pressed and the side indirectly pressed through the core mold cannot be pressed to a theoretical position by applying a pressure to one side thereof and compacting the opposite side. Thus, the compaction die 5 is designed to pre-compact each side of the flow path plate woven preform 2. In order to ensure that the surfaces of the flow channel plate woven preform 2 can be sufficiently compacted, the press blocks a501 and B502 are designed to be wedge-shaped, so that the left and right sides of the flow channel plate can be sufficiently compacted during pressing. And, in order to make both airfoil surfaces of the flow path plate preform sufficiently compacted, 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 thicker than the portions thereof above the side stoppers 507 by 0.3mm to 0.5 mm; similarly, a gap 509 is reserved between the molded surfaces of the bolt connection positions of the pressing block C503, the pressing block D504, the pressing block E505 and the end stop block 506, wherein the depth range of the gap 509 is 0.3-0.5 mm, and the left flanging, the right flanging and the top surface of the flow channel plate consisting of the left flanging and the right flanging of the prefabricated body can be fully compacted.
As an alternative embodiment, as shown in fig. 8, the pressing pieces a501 and B502 are wedge-shaped. Wherein, the wedge-shaped pressing block can ensure the full compaction between the wedge-shaped pressing block and the left side and the right side of the flow channel plate weaving prefabricated body 2.
As an alternative embodiment, as shown in fig. 7, the compaction die further includes small pressing blocks 508, and the small pressing blocks 508 are respectively disposed on the upper end surfaces of the pressing blocks a501 and B502 and are used for making the pressing blocks a501 and B502 flush with the side stoppers 507.
Specifically, the small pressing pieces 508 are provided to press the pressing pieces a501 and B502 against the flow path plate woven preform 2, the number of the small pressing pieces 508 may be four, and one small pressing piece 508 is provided at each of front and rear end portions of the pressing pieces a501 and B502.
Fig. 6, 19 and 20 are schematic structural diagrams of a composite material runner plate integrated RTM forming tool with a woven structure according to an embodiment of the present invention, where the forming tool may include a forming mold core mold 3, a fabric layer 4, a forming mold lower mold 6, a forming press block 7, and the above compacting mold 5; 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 laid between the forming die core die 3 and the forming die lower die 6;
the compacting 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 core mold 3 of the forming mold is a split structure. Wherein, because the runner plate is the three-sided closed box section structure with curvature, it is from the closed front end to the open-ended rear end, and the size of chamber is grow gradually, in order to make the smooth drawing of patterns of forming die mandrel 3 after solidifying, forming die mandrel 3 need adopt the design of piecemeal.
The embodiment of the invention also provides an integrated RTM (resin transfer molding) process for the composite material runner plate with the woven structure, which comprises the following steps of:
s100, wrapping the runner plate woven preform 2 in a forming mold core mold 3, placing the forming mold core mold in a compaction mold base 510, and trimming the boundary of a runner surface of the preform according to the base boundary of a compaction mold 5;
s200, 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 lower mould 6 of the forming mould; compressing the core mold 3 of the forming mold and the runner plate woven preform 2 to a theoretical position in the forming mold by using a forming press block 7, and then taking down the forming press block 7;
s300, assembling the upper die of the forming die and the lower die 6 of the forming die, injecting resin into the forming die, and finishing the curing and forming of the composite material runner plate with the woven structure according to a resin curing process.
In the above embodiment, since the right-turned edge fracture of the runner plate woven preform 2 occurs on the top surface of the runner plate, and the apparent quality of the runner plate after curing is poor due to the scattered fibers at the edge of the fracture, a layer of fabric of the same material as that of the runner plate woven preform 2 is previously laid on the lower mold 6 of the molding mold, and the compacted preform is placed in 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 joint of the forming pressing block 7 and the lower die bolt can be thinned by 0.3 mm-0.5 mm compared with the theoretical molded surface.
As an alternative embodiment, before step S100, the method further includes assembling the core molds into the forming mold core mold 3, and laying a release layer on the surface of the forming mold core mold 3. Specifically, during molding, the core blocks need to be bonded together in advance by glue such as 502 glue which is cured at normal temperature and has short curing time.
As an alternative embodiment, in step S100, the boundary of the core mold placing region of the runner plate woven preform 2 is provided with a yarn reducing thread for positioning the core mold 3 of the molding die.
Specifically, as shown in fig. 2, since the thickness of the runner surface of the runner plate woven preform 2 is not uniform to the thicknesses of the wings in the core mold placement region, the yarn reduction 205 is designed at the boundary of the core mold placement region of the runner plate woven preform 2, and the forming mold core mold 3 can be positioned into the runner plate woven preform 2 in accordance with the profile of the yarn reduction 205.
As an alternative embodiment, in step S100, the runner plate woven preform 2 is provided with a tracing line corresponding to the scribe line on the compaction mold 5.
Specifically, as shown in fig. 2, the runner plate woven preform 2 is further designed with a tracing line 204 corresponding to a scribing line on the compaction mold 5, so as to facilitate the positioning of the forming mold core mold 3 wrapped by the runner plate woven preform 2 in the compaction mold 5; the trace 204 is a fiber that is not the same color as the preform and may be fiberglass or kevlar or the like.
As an alternative embodiment, after the curing is completed, the runner plate made of the composite material with the woven structure is taken out from the forming die together with the core mold 3 of the forming die, and then the core block is sequentially pulled out in the die pulling order, so that the demolding of the runner plate is completed.
Example 1
Preparing an XX engine woven composite material runner plate, weaving a CCF800 carbon fiber woven integrated runner plate preform, performing RTM molding resin permeation by adopting Actech1304 epoxy resin, and adopting the RTM molding technology of the invention, wherein the specific process steps are as follows:
1) the structure of the runner plate 1 is as shown in fig. 1, and is a three-sided closed box section structure with curvature, the size of the cavity is gradually increased from the closed front end 105 to the opened rear end 106, and the core mould 3 of the forming mould adopts a block design and is divided into 6 blocks; during molding, a little 502 glue is coated on the non-working surface of the core mold, so that the core mold is bonded together until no obvious step difference exists at the abutted seam. Laying an isolation material outside the core mold;
2) placing the core mold 3 of the forming mold between the two yarn reducing yarns 205 of the flow channel plate woven preform 2, and enabling two boundaries of the core mold to coincide with the yarn reducing yarns 205 on two sides; transferring the preform together with the core mold into a base 510 of a compaction mold 5, and trimming the boundary of a runner plate runner surface 102 of the preform by pressing the boundary of the base 510 of the compaction mold; respectively turning up the left side surface 103 and the right side surface 104 of the runner plate along the core mold to enable the left and right turned edges to be fully contacted with the left side surface and the right side surface of the core mold, putting down a pressing block A501 and a pressing block B502, assembling an upper rear end block 506 and screwing a rear end block bolt; tightening the four small pressing blocks 508 on the pressing block A501 and the pressing block B502 to enable the pressing block A501 and the pressing block B502 to be flush with the side edge stop block 507, and compacting the left wing surface 107 and the right wing surface 108 of the flow channel plate; 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.
As shown in fig. 7-10, the left flanging of the preform is pressed down to be in full contact with the top surface of the core mold, the pressing block C503 is put down, the connecting bolts of the pressing block C503 and the front and rear end blocks are screwed, and the molded surface at 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 is pressed by 0.3-0.5 mm during screwing, the left flanging of the preform is guaranteed to be fully compacted, and the left flanging is cut along the boundary of the pressing block C503.
As shown in fig. 11-14, the pressing block C503 is removed, the right flanging of the preform is pressed down to make the right flanging fully contact with the top surface covered with the left flanging, the pressing block D504 of the pre-pressing mold is put down, the pressing block D504 and the front and rear end block connecting bolts are tightened, and similarly, the right flanging of the preform can be fully compacted, and the right flanging is cut along the boundary of the pressing block D504.
As shown in fig. 15 to 18, the retainer D504 is removed, the retainer E505 of the preloading die is lowered, the retainer E505 is tightened with the connecting bolts of the front and rear end blocks, and the top of the core mold covered with the left and right flanges is compacted for not less than 1h, and similarly, the top surface 101 of the runner plate can be sufficiently compacted.
3) Laying a layer of CF8611 carbon fiber fabric 4 on a lower die 6 of a forming die, wherein the laying direction is 0 degree/90 degrees, taking down a compaction die pressing block E505, and taking out the compacted preform together with a core die and placing the compacted preform in the lower die of the forming die; compressing the core mold and the prefabricated body to a theoretical position in a forming mold by using a forming pressing block 7, wherein the molded surface of the connecting part of the forming pressing block 7 and a lower mold bolt is 0.3-0.5 mm thinner than the theoretical molded surface, the runner surface 102 of the runner plate is pressed by 0.3-0.5 mm in the bolt tightening process to be fully compacted, and then taking down the forming pressing block 7;
4) assembling an upper half die and a lower half die of an RTM forming die, completing resin injection and curing according to Actech1304 epoxy resin process parameters, opening the die after curing is completed, taking out the braided composite material runner plate with the core die, and then sequentially pulling out the core blocks according to a die drawing sequence by using a die drawing device to obtain the Actech1304 epoxy resin/CCF 800 braided composite material runner plate.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. An integrated RTM forming auxiliary tool for a composite material runner plate with a woven structure is characterized by being a compaction die (5) and comprising 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 die base (510) is used for placing a forming die core die (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 surface and the right end surface;
the pressing block C (503) is used for being connected with the end stop block (506) and compacting a 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 a 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 a core mold top covered with the left flanging and the right flanging;
the two side limit stoppers (507) are respectively attached to the pressing block A (501) and the pressing block B (502) and used for extruding the pressing block A (501) and the pressing block B (502).
2. The integrated RTM forming auxiliary tool for the composite material flow channel plate with the braided structure according to claim 1, wherein the pressing block A (501) and the pressing block B (502) are wedge-shaped.
3. The RTM auxiliary tool for integrating the composite material flow channel plate with the braided structure is characterized by further comprising small pressing blocks (508), wherein the small pressing blocks (508) are respectively arranged on the upper end faces of the pressing block A (501) and the pressing block B (502) and are used for enabling the pressing block A (501) and the pressing block B (502) to be flush with the side stop blocks (507).
4. An integrated RTM (resin transfer molding) forming tool for a composite material runner plate with a woven structure is characterized by comprising a forming mold core mold (3), a fabric layer (4), a forming mold lower mold (6), a forming pressing block (7) and a compaction 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 laid between the forming die core die (3) and the forming die lower die (6);
the compaction mould (5) is used for compacting the runner plate woven preform (2), and the forming pressing block (7) is covered on the forming mould core mould (3) and is used for compacting the runner surface of the runner plate woven preform (2).
5. The RTM forming tool integrating the composite material flow channel plate with the braided structure is characterized in that a core mold (3) of the forming mold is of a split type structure.
6. An integrated RTM (resin transfer molding) forming process for a composite runner plate with a woven structure is characterized by comprising the following steps of:
step 1, wrapping a runner plate woven preform (2) in a forming mold core mold (3), placing the forming mold core mold in a compaction mold base (510), and trimming the boundary of a runner surface of the preform according to the base boundary of the compaction mold (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 the forming mould lower mould (6); compressing the core mould (3) of the forming mould and the runner plate woven preform (2) to a theoretical position in the forming mould by using the forming pressing block (7), and then removing the forming pressing block (7);
and 3, assembling the upper die of the forming die with the lower die (6) of the forming die, injecting resin into the forming die, and finishing the curing and forming of the composite material runner plate with the woven structure according to a resin curing process.
7. The RTM process of claim 6, further comprising assembling the core molds into the core mold (3) and laying a release layer on the surface of the core mold (3) before step S1.
8. The integrated RTM process of a composite runner plate woven structure according to claim 6, wherein in step S1, the boundary of the core mold placement region of the runner plate woven preform (2) is provided with a yarn reducing thread for positioning the forming mold core mold (3).
9. The RTM process of claim 6 or 8, wherein the runner plate woven preform (2) is provided with markings corresponding to the score lines on the compaction tool (5) in step S1.
10. The integrated RTM molding process of the composite runner plate with the woven structure according to claim 6, characterized in that after the curing is completed, the composite runner plate with the woven structure is taken out from the forming mold together with the core mold (3) of the forming mold, and then the core blocks are sequentially pulled out according to the mold pulling sequence, so as to complete the demolding of the runner plate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116001322A (en) * | 2022-12-26 | 2023-04-25 | 江西洪都航空工业集团有限责任公司 | RTM forming tool and forming method for guide vane composite material part |
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