CN113799919B - Composite material reinforcing rib connecting structure for underwater sound transmission window and manufacturing method thereof - Google Patents
Composite material reinforcing rib connecting structure for underwater sound transmission window and manufacturing method thereof Download PDFInfo
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- CN113799919B CN113799919B CN202111098703.9A CN202111098703A CN113799919B CN 113799919 B CN113799919 B CN 113799919B CN 202111098703 A CN202111098703 A CN 202111098703A CN 113799919 B CN113799919 B CN 113799919B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
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- 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
- B29C70/36—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 impregnating by casting, e.g. vacuum casting
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- 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
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Abstract
The invention discloses a composite material reinforcing rib connecting structure for an underwater sound transmission window and a manufacturing method thereof. This a combined material strengthening rib connection structure for underwater sound transmission window includes the combined material deck, the combined material strengthening rib, the fretwork steel framework, sound transmission window frame and connecting block, all weld the connecting block on fretwork steel framework and the sound transmission window frame, seted up a fluting on the connecting block in order to block in the combined material strengthening rib outside, the protruding one side setting of stretching in the combined material deck of combined material strengthening rib, combined material strengthening rib and combined material deck are the nexine and are carbon cloth, the skin is glass fiber cloth, when carbon cloth and glass fiber cloth lay, in the fluting of carbon cloth and glass fiber cloth embedding connecting block, lay and accomplish the back, the resin shaping is filled in the vacuum. This combined material strengthening rib connection structure does not adopt welding or the reliable connection of mode that screw connection also can realize strengthening rib and fretwork steel framework and sound-transmitting window frame, does not influence the sound transmission nature simultaneously.
Description
Technical Field
The invention relates to the field of ship structure design, in particular to a composite material reinforcing rib connecting structure for an underwater sound transmission window and a manufacturing method thereof.
Background
The large-scale underwater sound-transmitting window is an important structural member for realizing underwater detection and is applied to the military and civil fields. The materials of the underwater sound transmission window in China are selected in multiple stages of stainless steel, titanium alloy, glass fiber reinforced plastic, composite materials and the like, and the composite material plate frame structure reinforced by the hollow steel frame is adopted at present. In order to realize better large-angle sound transmission performance and reduce the structural weight of some sonar air guide hoods of underwater products, a hat-shaped composite material reinforcing rib sandwiched by sound transmission buoyancy materials is adopted to replace part of steel frameworks.
The prior art mainly comprises the following defects: 1. the traditional design scheme is reinforced by adopting a hollow steel framework, so that the weight is large, and the high-frequency and omnidirectional sound permeability is insufficient; the steel framework and the shell plate are connected by screws so that fibers are broken, the stress is discontinuous, and the reliability is low; the steel framework is deformed during welding, and the steel framework is difficult to shape and repair after the shell plates are laid. 2. Although the sandwich hat-shaped reinforcing rib made of the sound transmission buoyancy material is adopted, the weight is reduced, welding is avoided, the high-frequency sound transmission performance of the sandwich hat-shaped reinforcing rib is not as good as that of a hollow steel framework, the manufacturing process is complex, the sandwich hat-shaped reinforcing rib and the shell plate are difficult to integrally form, certain risks exist in the joint quality of each interface due to separate forming, and the sandwich hat-shaped reinforcing rib is not favorable for reliability and sound transmission performance under long-term service conditions.
Disclosure of Invention
The invention mainly aims to provide a composite material reinforcing rib connecting structure for an underwater sound transmission window and a manufacturing method thereof, aiming at realizing the reliable connection of a reinforcing rib, a hollow steel framework and a sound transmission window frame without adopting a welding or screw connection mode and simultaneously not influencing the sound transmission performance.
In order to achieve the above objects, the present invention provides a composite material reinforcing rib connection structure for an underwater sound transmission window, comprising a composite material shell plate, a composite material reinforcing rib, a hollow steel frame, a sound transmission window frame and a connection block, wherein,
all welding has the connecting block on fretwork steel framework and the sound-transmitting window frame, has seted up a fluting on the connecting block and in order to block in the combined material strengthening rib outside, and the protruding one side setting of stretching in the combined material coverboard of combined material strengthening rib, combined material strengthening rib and combined material coverboard are the nexine and are carbon fiber cloth, and the skin is glass fiber cloth, and when carbon fiber cloth and glass fiber cloth were laid, carbon fiber cloth and glass fiber cloth imbed the fluting of connecting block, lay the completion back, and the resin shaping is filled in the vacuum.
Preferably, a flange ball head is arranged at a flange part of one side, deviating from the composite shell plate, of the composite reinforcing rib, the flange ball head is formed by vacuum resin infusion after the end part of the composite reinforcing rib is coated with multiple layers of carbon fiber cloth and multiple layers of glass fiber cloth, the glass fiber cloth is positioned on the outer side of the carbon fiber cloth, and the flange ball head is separately formed by infusion after the composite reinforcing rib is formed.
Preferably, the width of the root of the groove on the connecting block is larger than that of the opening.
Preferably, the inner layer of each composite material reinforcing rib and the composite material shell plate is made of carbon fiber cloth, the outer layer of each composite material reinforcing rib is made of glass fiber cloth, the carbon fiber cloth and the glass fibers are embedded into the grooves of the connecting blocks when the carbon fiber cloth and the glass fibers are laid, and after the carbon fiber cloth and the glass fibers are laid, resin is poured in vacuum for forming.
Preferably, the composite material reinforcing rib comprises an embedded layer surface glass fiber protection plate positioned on the outer layer and an embedded layer carbon fiber composite plate positioned on the inner layer, and the composite material shell plate comprises an embedded layer surface glass fiber protection plate, an embedded layer carbon fiber composite plate, a tiled layer carbon fiber composite plate and a tiled layer surface glass fiber protection plate which are sequentially arranged from top to bottom.
Preferably, the glass fiber protection plate on the surface of the embedding layer and the glass fiber protection plate on the surface of the paving layer are both formed by glass fiber cloth through resin infusion, the carbon fiber composite material plate on the embedding layer is formed by carbon fiber cloth through resin infusion, the glass fiber protection plate on the surface of the embedding layer of the composite material shell plate, the carbon fiber composite material plate on the surface of the embedding layer of the composite material shell plate, the glass fiber protection plate on the surface of the embedding layer of the composite material reinforcing rib and the carbon fiber composite material plate on the embedding layer are formed by vacuum infusion for the first time, and the carbon fiber composite material plate on the paving layer of the composite material shell plate and the glass fiber protection plate on the surface of the paving layer are formed by vacuum infusion for the second time.
Preferably, the innermost layer at the joint of the composite material reinforcing rib and the composite material shell plate is a mixture of short carbon fiber cloth and short glass fiber cloth; the glass fiber cloth of the glass fiber protection plate on the surface of the embedded layer of the composite material reinforcing rib and the glass fiber cloth of the glass fiber protection plate on the surface of the embedded layer of the composite material shell plate are a whole piece of fiber cloth.
The invention further provides a manufacturing method of the composite material reinforcing rib connecting structure for the underwater sound transmission window, which comprises the following steps of:
step S20, manufacturing a first forming die for forming the composite shell plate and a second forming die for forming the composite reinforcing ribs, wherein grooves are formed in the second forming die, and the first forming die and the second forming die are connected with the hollow steel framework, the sound-transmitting window frame and the connecting blocks;
and S30, laying glass fiber cloth and carbon fiber cloth for forming the composite material reinforcing ribs and the composite material shell plates in the first forming die and the second forming die, laying the glass fiber cloth and the carbon fiber cloth at the grooves of the connecting blocks during laying, and performing vacuum resin infusion to form the composite material reinforcing ribs and the composite material shell plates after laying.
Preferably, the step S30 is followed by:
and S40, coating a plurality of layers of carbon fiber cloth on the flange part of the composite material reinforcing rib to form a bulb shape, coating a plurality of layers of glass fiber cloth on the outer layer, and finally performing vacuum infusion molding on the bulb part separately to integrate the bulb part and the web plate.
Preferably, the step S30 specifically includes:
step S301, paving glass fiber cloth on the surface of a first forming die, plugging the glass fiber cloth into a groove of a second forming die, and plugging the crossed part of the glass fiber cloth, a hollow steel framework and a sound-transmitting window frame into a groove of a connecting block to realize reliable insulation of carbon fibers and a steel structure;
step S302, laying carbon fiber cloth on the surface of the glass fiber cloth according to the designed layer number, inserting the carbon fiber cloth into the groove, inserting the cross part of the carbon fiber cloth, the hollow steel framework and the sound-transmitting window frame into the groove of the connecting block, and forming a web part of the composite material reinforcing rib;
step S303, carrying out primary vacuum infusion molding on the embedded layer surface glass fiber protection plate and the embedded layer carbon fiber composite material plate of the composite shell plate and the embedded layer surface glass fiber protection plate and the embedded layer carbon fiber composite material plate of the composite reinforcing rib, polishing the surface of the embedded layer smoothly after curing molding, checking the line type and the thickness of the shell plate and the thickness of the web plate of the composite reinforcing rib, and carrying out ultrasonic flaw detection on the composite shell plate and the web plate of the composite reinforcing rib;
step S304, laying carbon fiber cloth for forming the carbon fiber composite plate of the tiled layer on the surface of the embedded layer, laying multiple layers of glass fiber cloth to form a glass fiber protective plate on the surface of the tiled layer after the carbon fiber cloth reaches the designed layer number, then carrying out second vacuum infusion, removing the mold after curing and forming, checking the line type and the thickness of the composite shell plate, and carrying out ultrasonic flaw detection on the composite shell plate.
Preferably, the steps S302 and S303 further include:
and step S3021, filling gaps between the carbon fiber composite plates embedded in the layers on the two sides of the groove with short carbon fiber cloth and short glass fibers.
Compared with the traditional hollow steel framework, the lath type carbon fiber composite reinforcing rib with the flange ball head has the advantages of light weight, wide sound transmission frequency band, strong omnidirectional sound transmission, reliable integral forming and connecting of the lath, corrosion resistance, good manufacturability and the like. Compared with the existing acoustic transmission buoyancy material sandwich cap-shaped reinforcing rib, the acoustic transmission buoyancy material sandwich cap-shaped reinforcing rib has the advantages that the buoyancy core material is omitted, the interfaces of different materials are reduced, the acoustic transmission loss is reduced, the high-frequency acoustic transmission performance is better, the plate rib is integrally formed, the reliability is higher, and the connecting structure of the plate rib and a steel framework is also simplified. The underwater sound-transmitting window designed by the invention has the advantage that the structural weight can be reduced by about 30 percent. The invention is suitable for large-scale underwater sound transmission windows requiring wide frequency band and high sound transmission, can adapt to complex curved surface line types, and can be combined with a steel framework to form a mixed framework plate rib structure, thereby obtaining multiple benefits in the aspects of sound transmission, structural weight, reliability, corrosion resistance, manufacturing manufacturability and the like, and having wide application prospect.
Drawings
FIG. 1 is an axial side view of a cross node of a composite reinforcing rib and a hollow steel framework of the invention;
FIG. 2 is an axial side view of a composite reinforcing bar and steel frame connection node of the present invention;
FIG. 3 is a longitudinal cross-sectional view of a cross node of the composite reinforcing rib and the hollow steel framework of the present invention;
FIG. 4 is a longitudinal sectional view of a joint of a reinforcing rib and a frame of a sound-transmitting window of the composite material according to the present invention;
FIG. 5 is a cross-sectional view of a composite reinforcing bar according to the present invention;
FIG. 6 is a cross sectional view of a composite reinforcing bar and hollow steel framework cross node of the present invention.
In the figure, 1-composite shell plate; 2-a composite material reinforcing rib; 3-hollowing out a steel framework; 4-a first connection block; 5-acoustically transparent window rims; 6-a second connecting block; 7-embedding layer surface glass fiber protection board; 8-embedding a layer of carbon fiber composite material plate; 9-short fiber filled region; 10-spreading a layer of carbon fiber composite material plate; 11-glass fiber protection plate on surface of flat laying layer; 12-flange ball head coating layer; 13-flange ball head glass fiber protective layer.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention provides a composite material reinforcing rib connecting structure for an underwater sound transmission window.
Referring to fig. 1 to 6, in the preferred embodiment, a composite reinforcing rib connection structure for an underwater acoustic window includes a composite shell plate 1, a composite reinforcing rib 2, a hollow steel frame 3, an acoustic window frame 5, and a connection block, wherein,
all welded the connecting block on fretwork steel framework 3 and the sound-transmitting window frame 5, it is outside in order to block in combined material strengthening rib 2 (block in web) to have seted up a fluting on the connecting block, the protruding one side setting of stretching in combined material coverboard 1 of combined material strengthening rib 2, combined material strengthening rib 2 and combined material coverboard 1 are the nexine and are carbon cloth, the skin is glass cloth, when carbon cloth and glass cloth lay, in the fluting of carbon cloth and glass cloth embedding connecting block, lay and accomplish the back, carbon cloth and glass cloth vacuum infusion resin shaping.
Because the carbon fiber has conductivity and has potential difference with the steel structure, the direct contact steel structure can form a loop with seawater, and the corrosion of the steel structure is accelerated. Therefore, glass fiber is required to be paved on the surfaces of the carbon fiber composite shell plate 1 and the composite reinforcing ribs 2 to form a protective layer, so that the carbon fiber and the steel structure are insulated, and the steel structure is prevented from being subjected to potential corrosion.
The composite material reinforcing ribs 2 and the composite material shell plate 1 adopt the same reinforcing fibers and resin matrixes, and are integrally formed by vacuum curing, and meanwhile, the fibers are kept continuous. The height of the composite material reinforcing ribs 2 at the cross connection part is properly reduced to reduce the rigidity loss of the hollow steel framework 3, and meanwhile, the plate thickness is properly increased to ensure the strength and reliability of the connection node.
Further, the flange part of the composite material reinforcing rib 2, which deviates from one side of the composite material shell plate 1, is provided with a flange ball head, the flange ball head is formed by vacuum resin infusion after the end part of the composite material reinforcing rib 2 is coated with multiple layers of carbon fiber cloth and multiple layers of glass fiber cloth, the glass fiber cloth is positioned on the outer side of the carbon fiber cloth, and the flange ball head is separately infused and formed after the web plate of the composite material reinforcing rib 2 is formed.
Through setting up edge of a wing bulb to can effectively improve the moment of inertia of combined material strengthening rib 2, and do not increase extra interface, it is little to the perspective sound influence.
The height of the composite material reinforcing rib 2, the thickness of the web and the width and height of the flange ball head are all designed according to the upper limit of the required sound transmission frequency, the height of the composite material reinforcing rib 2 is not more than the minimum wavelength, the thickness of the web enables the sound pressure transmission coefficient measured by a sound tube test to be not less than 95%, the width and height of the flange to be not more than 1/5 of the minimum wavelength, and the design can ensure that the composite material reinforcing rib 2 has excellent omnidirectional sound transmission performance.
In this embodiment, the width of the root of the slot on the connecting block is larger than that of the opening, that is, the slot of the connecting block is a dovetail groove structure. The connecting block can be formed by thick steel plate wire-electrode cutting, and grooved lateral wall is equipped with certain inclination, and grooved root portion width is slightly bigger than the opening promptly, has higher joint strength after making the combined material embedding.
The end parts of the composite material reinforcing ribs 2 and the cross parts of the composite material reinforcing ribs 2 and the hollow steel framework 3 are all in a dovetail groove embedded connection structure form, and the dovetail groove embedded connection structure is simple in structure, free of screws, free of fiber breakage, high in reliability and high in strength and fatigue resistance.
Specifically, the composite material reinforcing ribs 2 and the composite material shell plate 1 are both made of carbon fiber cloth on the inner layer and glass fiber cloth on the outer layer, when the carbon fiber cloth and the glass fiber cloth are laid, the carbon fiber cloth and the glass fiber are embedded into the grooves of the connecting blocks, and after the laying is completed, resin is poured in vacuum for forming.
Composite material strengthening rib 2 is including being located outer embedding layer surface glass fiber protection board 7 (for glass fiber cloth infusion resin shaping) and being located the embedding layer carbon fiber composite board 8 (for carbon fiber cloth infusion resin shaping) of nexine, composite material shell 1 is including embedding layer surface glass fiber protection board 7 that sets gradually from top to bottom, embedding layer carbon fiber composite board 8, tiling layer carbon fiber composite board 10 and tiling layer surface glass fiber protection board 11, embedding layer surface glass fiber protection board 7 and tiling layer surface glass fiber protection board 11 are glass fiber cloth and pass through the infusion resin shaping, embedding layer carbon fiber composite board 8, tiling layer carbon fiber composite board 10 is carbon fiber cloth and passes through the infusion resin shaping, embedding layer surface glass fiber protection board 7 and embedding layer carbon fiber composite board 8 of composite material shell 1 and the embedding layer surface glass fiber composite board 7 and the embedding layer carbon fiber composite board 8 of composite material strengthening rib 2 are the vacuum infusion shaping of first time, tiling layer carbon fiber composite board 10 and tiling layer surface glass fiber protection board 11 of composite material shell 1 are the vacuum infusion shaping of second time.
The innermost layer at the joint of the composite material reinforcing rib 2 and the composite material shell plate 1 is a mixture of short carbon fiber cloth and short glass fiber cloth; the glass fiber cloth of the glass fiber protection plate 7 on the surface of the embedded layer of the composite material reinforcing rib 2 and the glass fiber cloth of the glass fiber protection plate 7 on the surface of the embedded layer of the composite material shell plate 1 are a whole piece of fiber cloth, so that the continuity of fibers is kept, and the integral structural strength is improved.
The composite material reinforcing rib connecting structure for the underwater sound transmission window is manufactured as follows.
1. And manufacturing a hollow steel framework 3 and a sound-transmitting window frame 5 of the sound-transmitting window, grooving at the intersection part of the hollow steel framework and the sound-transmitting window frame and the composite material reinforcing rib 2, and welding a connecting block.
2. The second forming die for manufacturing the web plate of the composite material reinforcing rib 2 by using the foam material is formed by numerical control machining of the groove, and is suitable for the shape of a complex curved surface. The side wall of the groove is provided with a certain draft angle, so that demoulding after curing is facilitated. The opening part of the groove is polished into a round angle, so that the root part of the formed reinforcing rib is smoothly transited with the shell plate, and stress concentration is avoided.
3. The manufacturing method comprises the steps of manufacturing a wooden support (the wooden support is used for a first forming die and is a frame structure formed by crossing a plurality of battens vertically and horizontally, a steel nail penetrates through a hollow part of a steel hollow reinforcing rib, the battens on two sides of the steel frame are clamped and fixed), covering the wooden support with a thin wood board or kraft paper, coating putty on the surface of the wooden support, forming a die (namely a first forming die) of the composite shell plate 1, smoothly connecting a second forming die with the first forming die, and inspecting the surface line type of the die. And (4) completing the sealing treatment and leakage detection of the die, particularly performing important treatment on a gap between the second forming die and the first forming die.
4. And finishing the laying of the composite material reinforcing ribs 2 and the glass fiber protection plates 7 on the surface of the embedded layers of the composite material reinforcing ribs 2 to form the inner surface protection layer of the sound-transmitting window. And paving the glass fiber cloth on the surface of the first forming die, filling the glass fiber cloth into the groove of the second forming die, and filling the cross part of the glass fiber cloth and the steel framework into the groove of the connecting block to realize reliable insulation of the carbon fiber and the steel structure.
5. And finishing laying of the carbon fiber composite material plate 8 of the embedded layer, laying the carbon fiber cloth on the surface of the glass fiber cloth according to the designed layer number, filling in the groove of the second forming die, filling in the groove of the connecting block with the crossed part of the steel framework, and forming the web part of the composite material reinforcing rib 2.
6. Filling gaps between the embedding layers on the two sides of the second forming die groove with short fibers (the length of the short fibers is shorter than that of the previous fibers), completing vacuum infusion of the embedding layers, polishing the surfaces of the embedding layers smoothly after curing forming, checking the line type and the thickness of the composite material shell plate 1 and the thickness of the composite material reinforcing rib 2 web plate, and carrying out ultrasonic flaw detection on the composite material shell plate 1 and the composite material reinforcing rib 2 web plate. At this time, the composite shell plate 1 (at this time, the composite shell plate 1 is partially molded) and the composite reinforcing ribs 2 are preliminarily connected with the steel framework into a whole.
7. Laying carbon fiber cloth of a flat layer on the surface of the embedded layer, laying a plurality of layers of glass fiber cloth as an outer surface protective layer of the sound-transmitting window after the carbon fiber cloth reaches the designed layer number, then carrying out vacuum infusion for the second time, dismantling the mould after curing and forming, inspecting the line type and the thickness of the composite shell plate 1, and carrying out ultrasonic flaw detection on the composite shell plate 1.
8. The flange part of the composite material reinforcing rib 2 is coated with a plurality of layers of carbon fiber cloth to form a bulb-shaped structure, so that the inertia moment of the cross section of the composite material reinforcing rib 2 is improved. The coverage area of the coating layer is reduced layer by layer, so that the coating layer and the web plate are in obtuse-angle transition, and stress concentration is avoided. After the number of the coating layers reaches the designed number, a plurality of layers of glass fiber cloth are laid as protective layers of the flange ball heads, and then the ball head parts are separately and independently formed in a vacuum infusion mode to be combined with the web plates into a whole. And (4) inspecting the height of the composite material reinforcing rib 2 and the size of the flange ball head, and performing ultrasonic flaw detection on the ball head part.
Compared with the traditional hollow steel framework 3, the lath-shaped carbon fiber composite reinforcing rib 2 with the flange ball head has the advantages of light weight, wide sound transmission frequency band, strong omnidirectional sound transmission, reliable integral forming and connecting of the laths, corrosion resistance, good manufacturability and the like. Compared with the existing acoustic transmission buoyancy material sandwich cap-shaped reinforcing rib, the acoustic transmission buoyancy material sandwich cap-shaped reinforcing rib has the advantages that the buoyancy core material is omitted, the interfaces of different materials are reduced, the acoustic transmission loss is reduced, the high-frequency acoustic transmission performance is better, the plate rib is integrally formed, the reliability is higher, and the connecting structure of the plate rib and a steel framework is also simplified. The underwater sound-transmitting window designed by the invention has the advantage that the structural weight can be reduced by about 30 percent. The invention is suitable for large underwater sound-transmitting windows requiring wide-frequency-band high sound-transmitting property, can adapt to complex curved surface line type, and can be combined with a steel framework to form a mixed framework plate rib structure, thereby obtaining multiple benefits in the aspects of sound-transmitting property, structural weight, reliability, corrosion resistance, manufacturing manufacturability and the like, and having wide application prospect.
The invention further provides a manufacturing method of the composite material reinforcing rib connecting structure for the underwater sound transmission window.
In this preferred embodiment, a manufacturing method based on the above composite material reinforcing rib connection structure for an underwater acoustic window includes the following steps:
step S20, manufacturing a first forming die for forming the composite shell plate 1 and a second forming die for forming the composite reinforcing ribs 2, wherein grooves are formed in the second forming die, and the first forming die and the second forming die are connected with the hollow steel framework 3, the sound-transmitting window frame 5 and the connecting blocks;
and step S30, laying glass fiber cloth and carbon fiber cloth for molding the composite material reinforcing ribs 2 and the composite material shell plate 1 in the first molding die and the second molding die, laying the glass fiber cloth and the carbon fiber cloth at the grooves of the connecting blocks during laying, and performing vacuum resin infusion to mold the composite material reinforcing ribs 2 and the composite material shell plate 1 after laying.
Further, step S30 is followed by:
and S40, coating a plurality of layers of carbon fiber cloth on the flange part of the composite material reinforcing rib 2 to form a bulb shape, coating a plurality of layers of glass fiber cloth on the outer layer, and finally performing vacuum infusion molding on the bulb part separately to integrate the bulb part and the web plate.
In this embodiment, step S30 specifically includes:
s301, paving glass fiber cloth on the surface of the first forming die, plugging the glass fiber cloth into a groove of the second forming die, and plugging the crossed part of the glass fiber cloth, the hollow steel framework 3 and the sound-transmitting window frame 5 into a groove of a connecting block to realize reliable insulation of carbon fibers and a steel structure;
s302, laying carbon fiber cloth on the surface of the glass fiber cloth according to the designed layers, plugging the carbon fiber cloth into the groove, plugging the crossed part of the carbon fiber cloth and the hollow steel framework 3 and the sound transmission window frame 5 into the groove of the connecting block, and forming a web part of the composite material reinforcing rib 2;
s303, carrying out primary vacuum infusion molding on the embedded layer surface glass fiber protection plate 7 and the embedded layer carbon fiber composite plate 8 of the composite shell plate 1 and the embedded layer surface glass fiber protection plate 7 and the embedded layer carbon fiber composite plate 8 of the composite reinforcing rib 2, polishing the surface of the embedded layer to be smooth after curing molding, checking the line type and the thickness of the shell plate and the thickness of the web plate of the composite reinforcing rib 2, and carrying out ultrasonic flaw detection on the composite shell plate 1 and the web plate of the composite reinforcing rib 2;
s304, laying carbon fiber cloth for forming the flat-layer carbon fiber composite material plate 10 on the surface of the embedded layer, laying multiple layers of glass fiber cloth to form a glass fiber protection plate 11 on the surface of the flat-layer after the carbon fiber cloth reaches the designed layer number, then carrying out secondary vacuum infusion, dismantling the mold after curing and forming, inspecting the line type and the thickness of the composite material shell plate 1, and carrying out ultrasonic flaw detection on the composite material shell plate 1.
Further, between the steps S302 and S303, the method further includes:
step S3021, filling gaps between the carbon fiber composite material plates 8 embedded in the layers on both sides of the groove with short carbon fiber cloth and short glass fibers.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are intended to be covered by the scope of the present invention.
Claims (10)
1. A composite material reinforcing rib connecting structure for an underwater sound transmission window is characterized by comprising a composite material shell plate, a composite material reinforcing rib, a hollow steel framework, a sound transmission window frame and a connecting block, wherein,
the hollow steel framework and the sound-transmitting window frame are both welded with connecting blocks, a groove is formed in each connecting block to be clamped outside the composite reinforcing rib, the composite reinforcing rib protrudes out of one side of the composite shell plate, the composite reinforcing rib and the composite shell plate are both provided with inner layers of carbon fiber cloth and outer layers of glass fiber cloth, when the carbon fiber cloth and the glass fiber cloth are laid, the carbon fiber cloth and the glass fiber cloth are embedded into the groove of each connecting block, and after the laying is completed, resin is poured in vacuum for forming; the hollow steel framework and the sound-transmitting window frame are connected with the composite material reinforcing rib on one side of the composite material shell plate through the connecting blocks.
2. The composite material reinforcing rib connecting structure for the underwater sound transmission window according to claim 1, wherein a flange ball head is provided at a flange portion of one side of the composite material reinforcing rib, which is away from the composite material shell plate, the flange ball head is formed by vacuum resin infusion after the end portion of the composite material reinforcing rib is coated with a plurality of layers of carbon fiber cloth and a plurality of layers of glass fiber cloth, the glass fiber cloth is positioned at the outer side of the carbon fiber cloth, and the flange ball head is separately infusion-formed after the composite material reinforcing rib is formed.
3. A composite material reinforcing rib connecting structure for an underwater acoustic window as set forth in claim 1, wherein the groove of said connecting block has a root width larger than a width of the opening.
4. The composite material reinforcing rib connecting structure for an underwater acoustic window according to any one of claims 1 to 3, wherein the composite material reinforcing rib comprises an embedded layer surface glass fiber protection plate on an outer layer and an embedded layer carbon fiber composite material plate on an inner layer, and the composite material shell plate comprises the embedded layer surface glass fiber protection plate, the embedded layer carbon fiber composite material plate, the tiled layer carbon fiber composite material plate and the tiled layer surface glass fiber protection plate which are arranged in this order from top to bottom.
5. The composite material reinforcing rib connecting structure for an underwater acoustic window according to claim 4, wherein both the embedded layer surface glass fiber protection plate and the tiled layer surface glass fiber protection plate are formed of glass fiber cloth by resin infusion, the embedded layer carbon fiber composite material plate is formed of carbon fiber cloth by resin infusion, the embedded layer surface glass fiber protection plate and the embedded layer carbon fiber composite material plate of the composite material shell plate and the embedded layer surface glass fiber protection plate and the embedded layer carbon fiber composite material plate of the composite material reinforcing rib are formed by first vacuum infusion, and the tiled layer carbon fiber composite material plate and the tiled layer surface glass fiber protection plate of the composite material shell plate are formed by second vacuum infusion.
6. The composite reinforcing rib connecting structure for an underwater acoustic window according to claim 5, wherein the innermost layer at the junction of the composite reinforcing rib and the composite shell plate is a mixture of short carbon fiber cloth and short glass fiber cloth; the glass fiber cloth of the glass fiber protection plate on the surface of the embedded layer of the composite material reinforcing rib and the glass fiber cloth of the glass fiber protection plate on the surface of the embedded layer of the composite material shell plate are a whole piece of fiber cloth.
7. A method of manufacturing a composite material reinforcing rib connecting structure for an underwater acoustic window according to any one of claims 1 to 6, comprising the steps of:
s10, manufacturing a hollow steel framework and a sound-transmitting window frame of the sound-transmitting window, and welding connecting blocks after grooves are formed in corresponding positions of the hollow steel framework and the sound-transmitting window frame;
step S20, manufacturing a first forming die for forming the composite shell plate and a second forming die for forming the composite reinforcing ribs, wherein grooves are formed in the second forming die, and the first forming die and the second forming die are connected with the hollow steel framework, the sound-transmitting window frame and the connecting blocks;
and S30, laying glass fiber cloth and carbon fiber cloth for forming the composite material reinforcing ribs and the composite material shell plates in the first forming die and the second forming die, laying the glass fiber cloth and the carbon fiber cloth at the grooves of the connecting blocks during laying, and performing vacuum resin infusion to form the composite material reinforcing ribs and the composite material shell plates after laying.
8. The method for manufacturing a composite material reinforcing rib connecting structure for an underwater acoustic window according to claim 7, wherein the step S30 is followed by comprising:
and S40, coating a plurality of layers of carbon fiber cloth on the flange part of the composite material reinforcing rib to form a bulb shape, coating a plurality of layers of glass fiber cloth on the outer layer, and finally performing vacuum infusion molding on the bulb part separately to integrate the bulb part and the web plate.
9. The method for manufacturing a composite material reinforcing rib connecting structure for an underwater acoustic window according to claim 7, wherein the step S30 specifically includes:
step S301, paving glass fiber cloth on the surface of a first forming die, plugging the glass fiber cloth into a groove of a second forming die, and plugging the crossed part of the glass fiber cloth, a hollow steel framework and a sound-transmitting window frame into a groove of a connecting block to realize reliable insulation of carbon fibers and a steel structure;
step S302, laying carbon fiber cloth on the surface of the glass fiber cloth according to the designed layers, plugging the carbon fiber cloth into the groove, plugging the crossed part of the carbon fiber cloth and the hollow steel framework and the sound-transmitting window frame into the groove of the connecting block to form a web part of the composite reinforcing rib;
step S303, carrying out primary vacuum infusion molding on the embedded layer surface glass fiber protection plate and the embedded layer carbon fiber composite material plate of the composite shell plate and the embedded layer surface glass fiber protection plate and the embedded layer carbon fiber composite material plate of the composite reinforcing rib, polishing the surface of the embedded layer smoothly after curing molding, checking the line type and the thickness of the shell plate and the thickness of the web plate of the composite reinforcing rib, and carrying out ultrasonic flaw detection on the composite shell plate and the web plate of the composite reinforcing rib;
step S304, laying carbon fiber cloth for forming the carbon fiber composite plate of the tiled layer on the surface of the embedded layer, laying multiple layers of glass fiber cloth to form a glass fiber protective plate on the surface of the tiled layer after the carbon fiber cloth reaches the designed layer number, then carrying out second vacuum infusion, removing the mold after curing and forming, checking the line type and the thickness of the composite shell plate, and carrying out ultrasonic flaw detection on the composite shell plate.
10. The method for manufacturing a composite material reinforcing rib connecting structure for an underwater acoustic window according to claim 9, wherein between the steps S302 and S303, further comprising:
and step S3021, filling gaps between the carbon fiber composite plates embedded in the layers on the two sides of the groove with short carbon fiber cloth and short glass fibers.
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