CN111716601B - A preparation method for a large main load-bearing composite material structure and a molding die used therefor - Google Patents
A preparation method for a large main load-bearing composite material structure and a molding die used therefor Download PDFInfo
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- CN111716601B CN111716601B CN202010708986.3A CN202010708986A CN111716601B CN 111716601 B CN111716601 B CN 111716601B CN 202010708986 A CN202010708986 A CN 202010708986A CN 111716601 B CN111716601 B CN 111716601B
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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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/30—Mounting, exchanging or centering
- B29C33/301—Modular mould systems [MMS], i.e. moulds built up by stacking mould elements, e.g. plates, blocks, rods
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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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/30—Mounting, exchanging or centering
- B29C33/305—Mounting of moulds or mould support plates
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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
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- 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)
- Moulds For Moulding Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
A method for preparing a large load-bearing composite material structure and a molding mold used, belonging to the field of composite material structure preparation. The present invention aims to solve the problem of the lack of appropriate molding molds and complex processes in the preparation of composite material structural components in the prior art, which greatly affects the efficiency of preparation and increases the probability of defects in the product during the molding process and later stages. In the molding mold of the present invention, the upper pressing plate, split mold component, and lower pressing plate are arranged in sequence from top to bottom, and the upper pressing plate and split mold component are detachably connected by connectors. The split mold component and lower pressing plate are detachably connected by connectors, and the circumferential reinforcement component is sleeved on the outer circular surface of the upper pressing plate and lower pressing plate. The upper and lower pressure plates are tightly fitted with the circumferential reinforcement components, At the same time, a new preparation method is proposed using the above-mentioned mold, which is mainly used for the preparation of large-scale load-bearing composite material structures.
Description
Technical Field
The invention belongs to the field of preparation of composite material structures, and particularly relates to a preparation method of a large-scale main bearing composite material structure and a forming die used by the same.
Background
The carbon fiber reinforced resin matrix composite structural member is widely applied to production and life, especially in the field of aviation and aerospace. How to meet the preset design index, and ensure that the fibers effectively transmit the load in the production process of the composite material, and the effective load is the key point of the process research. The invention discloses a process optimization method of a composite structural member applied to a space station.
Space station composite components are demanding in terms of use and in space, composite components will face challenges of weightlessness, radiation, and various intentions. Meanwhile, the large load is required to be borne, each cabin in butt joint weighs more than 20 tons (butt joint of manned airships, freight airships and the like), and the complex configuration is a characteristic of a composite structural member used in a space station.
As an interface, composite structural members face challenges that go beyond. When designing, the bearing capacity of the interface needs to be checked in numerous times, and meanwhile, the quality of the interface is reduced to the minimum and the cost is controlled on the premise of ensuring the necessary conditions such as rigidity and strength. How to effectively meet design criteria is therefore a great concern for the process.
After the composite material main bearing structural member product is molded, the overall flatness of individual positions needs to be less than 0.12mm, and the flatness of a specified single surface needs to be less than 0.03mm.
The composite material main bearing structural member product needs to be pressed tightly, and if defects appear in the composite material main bearing structural member product, the corresponding flaw detection standard needs to be met. Because the internal layering defect of the composite material has direct influence on the rigidity strength of the product, the mechanical property is influenced.
Meanwhile, the surface is clean, pollution-free, visual scratch-free, indentation-free, fiber-free, broken-free and smooth.
In the prior art, due to the lack of a proper forming die and a relatively complex process in the preparation of the composite structural member, the preparation efficiency is greatly influenced, and meanwhile, the probability of defects of a product in the forming process and the later forming stage is increased, so that the composite main bearing structural member can be effectively formed through reasonable process configuration, and all design requirements are met. Has important significance for the actual production process.
Disclosure of Invention
The invention aims to solve the problems that the preparation efficiency is greatly influenced due to the lack of a proper forming die and a complex process in the preparation of a composite structural member in the prior art, and the probability of defects generated in the product in the forming process and the later forming period is increased, and further provides a preparation method of a large-scale main bearing composite structure and a forming die used in the preparation method;
The utility model provides a forming die of large-scale main bearing combined material structure, forming die includes top board, holding down plate, circumference reinforcement subassembly and split mould subassembly, top board, split mould subassembly and holding down plate set gradually from top to bottom, and top board and split mould subassembly pass through the connecting piece and dismantle the connection, and split mould subassembly and holding down plate pass through the connecting piece and dismantle the connection, and circumference reinforcement subassembly cover is established on the outer disc of top board and holding down plate, and circumference reinforcement subassembly and top board and holding down plate closely laminate and set up.
Further, the circumferential reinforcement assembly comprises a circumferential inner pressurizing plate, a circumferential die clamping force bearing plate and a circumferential outer pressurizing plate, wherein the circumferential inner pressurizing plate is sleeved on the outer circular surfaces of the upper pressing plate and the lower pressing plate, the circumferential inner pressurizing plate is tightly attached to the upper pressing plate and the lower pressing plate, the circumferential outer pressurizing plate is sleeved on the outer circular surface of the circumferential inner pressurizing plate, the circumferential die clamping force bearing plate is arranged between the circumferential outer pressurizing plate and the circumferential inner pressurizing plate, and the circumferential outer pressurizing plate is tightly attached to the circumferential inner pressurizing plate through the circumferential die clamping force bearing plate;
further, the split die assembly comprises eight split dies, and each split die is detachably connected with the upper pressing plate and the lower pressing plate through connecting pieces;
Further, the connecting piece is a bolt and nut mechanism;
Further, the split die comprises a positioning core, a plurality of side pressing blocks and a plurality of rubber sheets, N first connecting through holes are processed at the top of the positioning core, N is a positive integer, the side pressing blocks are sleeved on the side wall of the positioning core, the side pressing blocks are detachably connected with the positioning core, and the rubber sheets are sleeved on the outer wall of the side pressing blocks;
further, a plurality of second connecting through holes are processed on the end faces of the upper pressing plate and the lower pressing plate, and each second connecting through hole is correspondingly arranged with one first connecting through hole in the split die.
A molding method of a large main bearing composite material structure is realized by the following steps:
Firstly, fixing a lower pressing plate, paving carbon fiber composite material prepregs layer by layer on the lower pressing plate, and paving 12-20 layers according to different sizes of composite material bearing structures to be formed;
step two, each split die in the spread split die assembly is fixedly connected to the upper surface of the lower pressing plate one by one through fastening bolts according to the corresponding position on the lower pressing plate to form a complete split die assembly;
Step three, paving carbon fiber composite material prepregs layer by layer on the upper surface of the split die assembly, and paving 12-20 layers according to different sizes of main bearing structures of the composite materials to be formed;
Arranging an upper pressing plate on the carbon fiber composite material on the split die assembly, ensuring that a second connecting through hole on each upper pressing plate is sleeved on a fastening bolt used for connecting the split die with the lower pressing plate, and sleeving a nut on each fastening bolt extending out of the top end of the upper pressing plate;
Step five, die assembly is carried out, the upper pressing plate is enabled to move linearly downwards through rotating a nut at the top of the upper pressing plate, and meanwhile, the composite material prepreg between the upper pressing plate and the split die assembly is pressed tightly until a die assembly clearance between the upper pressing plate 2 and the split die assembly is less than 0.1, and then solidification is carried out for 9h;
Step six, demoulding is carried out after solidification and molding, nuts at the top of the upper pressing plate are loosened one by one, and the upper pressing plate is separated from the split die assembly;
Step seven, removing the composite material overflowed from the periphery of each split die, and cutting before demolding according to the position where the process cutting amount is reserved;
and step eight, sequentially demolding the split molds in the occlusion state according to design requirements, wherein the demolding sequence is sequentially a positioning core, a plurality of side pressing blocks and a rubber sheet.
The height of the positioning core in the fourth step is 5 mm-10 mm higher than the theoretical height value of the product during design;
and in the fourth step, the plurality of rubber sheets in each split die are silicon rubber sheets with the thickness of 1 mm-5mm.
Compared with the prior art, the invention has the following beneficial effects:
Compared with the prior art, the preparation method of the large main bearing composite material structure and the forming die are characterized in that the design concept of the split die is adopted in the forming die, so that inconvenience of the whole die in installation and demolding is avoided, the demolding efficiency is improved, the demolding success rate is greatly improved, defects of products in demolding are avoided, and in addition, in the mold closing process, the upper pressing plate is gradually pressed with the lower pressing plate by applying force to the upper pressing plate, bubbles generated in the product in the forming process are effectively eliminated, and the product forming quality is improved.
Drawings
FIG. 1is a top view of a forming clamp of the present invention;
FIG. 2 is a fragmentary view in principal section of a forming clamp according to the present invention;
FIG. 3 is a schematic view of a circumferential reinforcement assembly according to the present invention;
FIG. 4 is a schematic view of a split die in the present invention;
FIG. 5 is a schematic front view of a center split die of the present invention;
FIG. 6 is a schematic view of the positioning core of the center split die of the present invention;
FIG. 7 is a schematic view of a side compact of a center split die of the present invention;
FIG. 8 is a schematic view of a rubber sheet of a center split die of the present invention;
FIG. 9 is a schematic view of a fan-shaped composite structure formed in accordance with the present invention;
FIG. 10 is a schematic diagram of the distribution of an 8-block split die in the present invention;
In the figure, an upper pressing plate, a lower pressing plate, a 3-circumferential reinforcing component, a 31-circumferential inner pressing plate, a 32-circumferential die clamping stress plate, a 33-circumferential outer pressing plate, a 4-split die, a 41 positioning core, a 42-side pressing block, a 43 rubber sheet and a 5-composite material component are arranged.
Detailed Description
The first embodiment is described with reference to fig. 1 to 5, and provides a method for manufacturing a large-scale main bearing composite material structure and a forming die used by the method, the forming die comprises an upper pressing plate 1, a lower pressing plate 2, a circumferential reinforcing component 3 and a split die component, the upper pressing plate 1, the split die component and the lower pressing plate 2 are sequentially arranged from top to bottom, the upper pressing plate 1 and the split die component are detachably connected through connecting pieces, the split die component and the lower pressing plate 2 are detachably connected through connecting pieces, the circumferential reinforcing component 3 is sleeved on the outer circular surfaces of the upper pressing plate 1 and the lower pressing plate 2, and the circumferential reinforcing component 3 is tightly attached to the upper pressing plate 1 and the lower pressing plate 2.
In this embodiment, the forming mold is a metal combined mold, and when the mold design is performed, the wall thickness and the forming quality of the composite material member are fully considered, and the split-split mold and the attaching expansion rubber are adopted, so that the mold is convenient to be released after forming and cured and pressurized in the forming process, and in the mold, the glue overflow hole is added in the lower pressing plate 2, and the glue overflow hole is newly added at the position of 8-16 positions at the outer edge of the mold flange. The method comprises the steps of improving a mold closed cavity structure, facilitating resin flow and interlayer air removal in a mold closing and curing process, defining a layering center during molding, establishing a Cartesian coordinate system, dividing the whole mold into quadrants, carrying out integral laying, split mold laying, assembling and integral laying according to the quadrants, and carrying out molding according to the principle that fibers are continuously inherited in the laying process and no interface is arranged at corners.
In the second embodiment, referring to fig. 4, the description is made on the present embodiment, which further defines the circumferential reinforcement assembly 3 in the first embodiment, in the present embodiment, the circumferential reinforcement assembly 3 includes a circumferential inner pressing plate 31, a circumferential clamping force plate 32, and a circumferential outer pressing plate 33, the circumferential inner pressing plate 31 is sleeved on the outer circumferential surfaces of the upper pressing plate 1 and the lower pressing plate 2, the circumferential inner pressing plate 31 is tightly attached to the upper pressing plate 1 and the lower pressing plate 2, the circumferential outer pressing plate 33 is sleeved on the outer circumferential surface of the circumferential inner pressing plate 31, the circumferential clamping force plate 32 is disposed between the circumferential outer pressing plate 33 and the circumferential inner pressing plate 31, and the circumferential outer pressing plate 33 is tightly attached to the circumferential inner pressing plate 31 through the circumferential clamping force plate 32. Other components and connection modes are the same as in the first embodiment.
In this embodiment, the circumferential reinforcement component 3 mainly plays roles of circumferential fixing, limiting and sealing, and avoids a large amount of overflow of the composite material after being stressed in the mold closing process.
In the third embodiment, the present embodiment is described with reference to fig. 1, and the split die assembly in the first embodiment is further limited, where the split die assembly includes eight split dies 4, and each split die 4 is detachably connected to the upper platen 1 and the lower platen 2 through a connecting piece. Other components and connection modes are the same as in the first embodiment.
In this embodiment, the eight split molds 4 are planned according to the composite material structure to be manufactured, as shown in fig. 9 and 10, one split mold is disposed at each through hole in each composite material structure, so that the eight split molds 4 specifically include two triangular split molds and six circumferential split molds. The triangular split molds are positioned at two ends of the fan, six circumferential split molds are arranged between the two triangular split molds, and the six circumferential split molds are arranged at one side along the circumferential direction. (modification of product appearance descriptive content)
In a fourth embodiment, the connecting piece according to the first embodiment is further limited, and in this embodiment, the connecting piece is a bolt-nut mechanism. Other components and connection modes are the same as in the first embodiment.
In the fifth embodiment, the split mold 4 further defines the first embodiment, and in the present embodiment, the split mold 4 includes a positioning core 41, a side pressing block 42 and a rubber sheet 43, N number one connecting through holes are machined in the top of the positioning core 41, N is a positive integer, the side pressing block 42 is sleeved on the side wall of the positioning core 41, the side pressing block 42 is detachably connected with the positioning core 41, and the rubber sheet 43 is sleeved on the outer wall of the side pressing block 42. Other components and connection modes are the same as in the first embodiment.
In this embodiment, the positioning core 41 is used for fixing the upper pressing plate 1 and the lower pressing plate 2, the contact surface between the split mold 4 and the composite structure is a rubber sheet 43 for attaching the composite structure, the rubber sheet 43 is a silicone rubber sheet, the thickness is 1mm-5mm, the outer surface of the rubber sheet 43 is coated with a release agent, and the surface of the composite structure is not damaged during demolding.
In the sixth embodiment, the present embodiment is further defined by referring to fig. 1, in the first embodiment, the upper platen 1 and the lower platen 2 are both processed with a plurality of second connecting through holes on end surfaces of the upper platen 1 and the lower platen 2, and each second connecting through hole is disposed corresponding to one first connecting through hole in the split mold 4. Other components and connection modes are the same as in the first embodiment.
The seventh embodiment provides a preparation method of a large main bearing composite material structure, which is realized by the following steps:
firstly, fixing a lower pressing plate 2, sleeving a circumferential reinforcing component 3 on the lower pressing plate 2, paving carbon fiber composite material prepregs layer by layer on the lower pressing plate 2, and paving 12-20 layers according to different sizes of fan-shaped main bearing structures of the composite materials to be formed;
Step two, each split die 4 in the split die assembly is fixedly connected to the upper surface of the lower pressing plate 2 one by one through fastening bolts according to the corresponding position on the lower pressing plate 2 to form a complete split die assembly;
Step three, paving carbon fiber composite material prepregs layer by layer on the upper surface of the split die assembly, and paving 12-20 layers according to different sizes of the sector main bearing structures of the composite materials to be formed;
arranging an upper pressing plate 1 on a resin composite material on the split die assembly, ensuring that a second connecting through hole on each upper pressing plate 1 is sleeved on a fastening bolt used for connecting the split die 4 with the lower pressing plate 2, and sleeving a nut on each fastening bolt extending out of the top end of the upper pressing plate 1;
Step five, die assembly is carried out, the upper pressing plate 2 is enabled to move linearly downwards by rotating a nut at the top of the upper pressing plate 1, and meanwhile, a resin composite material between the upper pressing plate 2 and the split die assembly is compressed until a die assembly clearance between the upper pressing plate 2 and the split die assembly is less than 0.1, and then solidification is carried out for 9h;
Step six, demolding after solidification molding, loosening nuts at the top of the upper pressing plate 1 one by one, and separating the upper pressing plate 1 from the split die assembly;
step seven, removing the composite material overflowed from the periphery of each split die, and cutting before demolding according to the position where the process cutting amount is reserved;
And step eight, sequentially demolding the split molds 4 in the occlusion state according to design requirements, wherein the demolding sequence is sequentially a positioning core 41, a plurality of side pressing blocks 42 and a rubber sheet 43.
In the embodiment, a pre-pressing mechanism is added when the carbon fiber composite prepreg is paved in the first step and the third step, a greasy knife is used for pressing after each layer is paved in the body paving and forming process, air bubbles are removed, and in the paving process of the block mould, the middle process is added for vacuumizing and pre-pressing. Removing bubbles in the molding process, and preventing layering among prepreg layers;
when the product is demolded, the positioning core 41 is lifted upwards, then each split side pressing block 42 is taken out inwards in sequence, and finally the expansion rubber sheet 43 is taken out. The process reduces the influence of the mold release on the internal quality of the product contact surface in the mold release process;
The whole die is a detachable outer die, and the overflow space of the outer die and the product is enlarged, so that the phenomenon that the outer flange clamp cannot compact and interlayer layering is caused by relative movement of the product and the die is prevented.
In the eighth embodiment, the fourth step of the seventh embodiment is further defined, and in the present embodiment, the height of the positioning core 41 in each split mold 4 in the fourth step is 5mm to 10mm higher than that of the product in design. Other components and connection modes are the same as in the first embodiment.
In the ninth embodiment, the fourth step of the seventh embodiment is further limited, and in the fourth embodiment, the plurality of rubber sheets 43 in each split mold 4 are all silicone rubber sheets with a thickness of 1mm to 5 mm. Other components and connection modes are the same as in the first embodiment.
In the embodiment, the compression amount is defined by the maximum expansion amount of the rubber at 165-175 ℃ and the prepreg design, the die set is pushed back, and the expansion and pressing of the rubber sheet are used for making up the position where the metal clamping force is not transmitted or directly applied, in particular to the stud of the I-beam structure (the shape after the composite material structure is molded) and the bottom surface of the upper pressing plate 1.
Embodiment one:
This embodiment takes the process of forming an I-beam structure with a height of 6mm at one of the split dies of 1 part as an example.
Firstly, the detachable part of the die is completely detached to avoid scratching the surface of the die, and the residual resin and other substances on the surface of the die are cleaned up;
Next, an expanded rubber sheet 43 having a thickness of 4.5mm was adhered to the molding surface of the side pressure block 42 in the mold, and the dimensions of the rubber sheet 43 were 205 mm. Times.62 mm, 315 mm. Times.59 mm, etc. Uniformly coating a release agent on the contact surface of the die and the composite material for 2-3 times, and standing for 0.5h for use;
the circumferential fixing component 3 is sleeved on the lower pressing plate 2, prepreg is adhered to the upper surface of the lower pressing plate 2, the molding surface is required to be covered comprehensively and uniformly, and the molding surface is paved and recorded according to a paving layer (0/90/+45/-45) ns. Where n is the design value and s is the mirror image placement. After each layer is laid, the air bubbles are removed by pressing with a greasy knife. Trimming the prepreg at the position of the closed edge to ensure the edge to be neat so as to facilitate smooth die assembly;
the prepreg is attached to the upper surface of the mounted split mold assembly, the molding surface is required to be covered comprehensively and uniformly, and the prepreg is laid and recorded according to a layering (0/90/+45/-45) ns. Where n is the design value and s is the mirror image placement. After each layer is laid, the air bubbles are removed by pressing with a greasy knife. Trimming the prepreg at the position of the closed edge to ensure the edge to be neat so as to facilitate smooth die assembly;
Assembling split die assemblies, and installing each split die 4 on the lower pressing plate 2 through a bolt and nut mechanism;
The upper pressing plates 1 are arranged on the split die assemblies, so that the second connecting through holes on each upper pressing plate 1 are guaranteed to be sleeved on the fastening bolts used for connecting the split die 4 with the lower pressing plates 2, nuts are sleeved on each fastening bolt extending out of the top ends of the upper pressing plates 1, and the bolts are used for pressurizing and die assembly, so that the front and rear position alignment of the dies is guaranteed during die assembly. During die assembly, the pressurizing bolts are symmetrically fastened, so that the upper die and the lower die are tightly assembled, the alignment marks of the upper die and the lower die are noted, and the upper state of a product is ensured to be uniform, and fibers are smooth;
And after the die is closed, putting the die into a curing furnace for heat sealing. Is performed strictly according to a curing system.
And after heat sealing and solidification, taking out the die, naturally cooling to room temperature, and demolding. All bolts are removed, the upper pressing plate 1 is removed, the split dies 4 are removed one by one (the demoulding sequence of the split dies 4 is a positioning core, a plurality of side pressing blocks and rubber sheets), and the product is taken out. During demolding, the molding surface of the die cannot be scratched.
Through nondestructive inspection, the composite structural member meets the design requirement, the overall flatness of the designated part is 0.10mm, and the flatness of the designated single surface is 0.01 mm-0.03 mm.
Claims (4)
1. The forming die of the large main bearing composite material structure is characterized by comprising an upper pressing plate (1), a lower pressing plate (2), a circumferential reinforcing component (3) and a split die component, wherein the upper pressing plate (1), the split die component and the lower pressing plate (2) are sequentially arranged from top to bottom, the upper pressing plate (1) is detachably connected with the split die component through a connecting piece, the split die component is detachably connected with the lower pressing plate (2) through the connecting piece, the circumferential reinforcing component (3) is sleeved on the outer circular surfaces of the upper pressing plate (1) and the lower pressing plate (2), and the circumferential reinforcing component (3) is tightly attached to the upper pressing plate (1) and the lower pressing plate (2);
The circumferential reinforcement assembly (3) comprises a circumferential inner pressurizing plate (31), a circumferential die clamping stress plate (32) and a circumferential outer pressurizing plate (33), wherein the circumferential inner pressurizing plate (31) is sleeved on the outer circular surfaces of the upper pressing plate (1) and the lower pressing plate (2), the circumferential inner pressurizing plate (31) is tightly attached to the upper pressing plate (1) and the lower pressing plate (2), the circumferential outer pressurizing plate (33) is sleeved on the outer circular surface of the circumferential inner pressurizing plate (31), the circumferential die clamping stress plate (32) is arranged between the circumferential outer pressurizing plate (33) and the circumferential inner pressurizing plate (31), and the circumferential outer pressurizing plate (33) is tightly attached to the circumferential inner pressurizing plate (31) through the circumferential die clamping stress plate (32);
The split die assembly comprises eight split dies (4), and each split die (4) is detachably connected with the upper pressing plate (1) and the lower pressing plate (2) through connecting pieces;
The connecting piece is a bolt and nut mechanism;
The split die (4) comprises a positioning core (41), a side pressing block (42) and a rubber sheet (43), wherein N first connecting through holes are processed at the top of the positioning core (41), N is a positive integer, the side pressing block (42) is sleeved on the side wall of the positioning core (41), the side pressing block (42) is detachably connected with the positioning core (41), and the rubber sheet (43) is sleeved on the outer wall of the side pressing block (42);
a plurality of second connecting through holes are formed in the end faces of the upper pressing plate (1) and the lower pressing plate (2), and each second connecting through hole is correspondingly arranged with one first connecting through hole in the split die (4).
2. The preparation method for realizing the large-scale main bearing composite material structure by using the forming die of the large-scale main bearing composite material structure in the claim 1 is characterized by comprising the following steps:
Firstly, fixing a lower pressing plate (2), paving carbon fiber composite material prepregs layer by layer on the lower pressing plate (2), and paving 12-20 layers according to different sizes of large main bearing structures of composite materials to be formed;
Step two, each split die (4) in the split die assembly is fixedly connected to the upper surface of the lower pressing plate (2) one by one through fastening bolts according to the corresponding position on the lower pressing plate (2) to form a complete split die assembly;
Step three, paving carbon fiber composite material prepregs layer by layer on the upper surface of the split die assembly, and paving 12-20 layers according to different sizes of large main bearing structures of the composite materials to be formed;
Arranging an upper pressing plate (1) on a resin composite material on the split die assembly, ensuring that a second connecting through hole on each upper pressing plate (1) is sleeved on a fastening bolt used for connecting the split die (4) with the lower pressing plate (2), and sleeving a nut on each fastening bolt extending out of the top end of the upper pressing plate (1);
Step five, die assembly is carried out, the nut at the top of the upper pressing plate (1) is rotated, the upper pressing plate (1) moves downwards in a straight line, meanwhile, a resin composite material between the upper pressing plate (1) and the split die assembly is compressed until a die assembly clearance between the upper pressing plate (1) and the split die assembly is less than 0.1, and then solidification is carried out for 9 hours;
Step six, demolding after solidification molding, loosening nuts at the top of the upper pressing plate (1) one by one, and separating the upper pressing plate (1) from the split die assembly;
Step seven, removing the composite material overflowed from the periphery of each split die, and cutting before demolding according to the position where the process cutting amount is reserved;
and step eight, sequentially demolding the split molds (4) in the occlusion state according to design requirements, wherein the demolding sequence sequentially comprises a positioning core (41), a plurality of side pressing blocks (42) and rubber sheets (43).
3. The method for preparing a large-scale main bearing composite material structure according to claim 2, wherein the height of the positioning cores (41) in each split die (4) in the fourth step is 5 mm-10 mm higher than that of the product in design.
4. The method for preparing the large-scale main bearing composite material structure according to claim 3, wherein the plurality of rubber sheets (43) in each split die (4) in the fourth step are all silicon rubber sheets with the thickness of 1 mm-5 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010708986.3A CN111716601B (en) | 2020-07-22 | 2020-07-22 | A preparation method for a large main load-bearing composite material structure and a molding die used therefor |
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| CN202010708986.3A CN111716601B (en) | 2020-07-22 | 2020-07-22 | A preparation method for a large main load-bearing composite material structure and a molding die used therefor |
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| CN111716601B true CN111716601B (en) | 2025-04-18 |
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| CN113650200B (en) * | 2021-07-01 | 2023-06-13 | 西北工业大学 | A bonding tool for the manufacture of split-type composite core molds |
| CN116021796B (en) * | 2023-01-09 | 2025-04-01 | 长春长光宇航复合材料有限公司 | H-beam structure composite material support plate and forming method and forming device thereof |
| CN119748913B (en) * | 2024-12-17 | 2025-10-28 | 哈尔滨飞机工业集团有限责任公司 | Forming method and device for hollow structural parts of composite materials with large curvature and thick layers |
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| CN106799798A (en) * | 2017-02-13 | 2017-06-06 | 中国船舶重工集团公司第七二五研究所 | A kind of split mould of hyperboloid revolving solid composite material product |
| CN212331565U (en) * | 2020-07-22 | 2021-01-12 | 哈尔滨玻璃钢研究院有限公司 | Forming die of large-scale main load-carrying composite material structure |
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| CN106799798A (en) * | 2017-02-13 | 2017-06-06 | 中国船舶重工集团公司第七二五研究所 | A kind of split mould of hyperboloid revolving solid composite material product |
| CN212331565U (en) * | 2020-07-22 | 2021-01-12 | 哈尔滨玻璃钢研究院有限公司 | Forming die of large-scale main load-carrying composite material structure |
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