Sandwich composite floor panel with interface, method of manufacture, mould and use thereof

Abstract

The present application relates to a kind of preparation mold of sandwich composite floor with interface, sandwich composite floor with interface, its preparation method and application, including floor and cover plate;The upper plate surface of floor is provided with two first embedded slots along its length direction interval, the upper plate surface of floor is provided with two second embedded slots in its width direction interval, two first embedded slots and two second embedded slots are surrounded with laying area;It further includes the inner frame surrounded by laying area, the outer frame surrounded outside the inner frame, and the outer frame is detachably connected with floor;Through the design of the mold of sandwich composite floor with interface to solve the technical problems in the prior art that the train floor adopts single-layer iron plate structure, the overall weight is large, the maintenance protection replacement operation is inconvenient, which causes the daily operation cost to be high.

Description

Technical Field

[0001] This invention relates to the field of composite material technology, and in particular to a sandwich composite material base plate with an interface, a preparation method, a mold, and its application. Background Technology

[0002] The high-speed train floor plate, as the main load-bearing and protective component under the train, primarily functions to achieve smooth aerodynamic flow and reduce running resistance. Secondly, it provides a robust physical barrier for critical undercarriage equipment (such as bogies and battery boxes), effectively resisting external impacts such as stone chips and water splashes encountered during operation. Existing floor plate products are mainly single-layer iron plate structures, resulting in large overall weight, inconvenient maintenance, protection, and replacement operations, and high daily operating costs. Furthermore, train floor plates generate significant noise, leading to a poor passenger experience; their overall impact resistance is poor, making them susceptible to damage during use and resulting in high repair costs.

[0003] Zhou Chunhua and Li Gang developed a new type of equipment compartment bottom plate made of aluminum honeycomb sandwich structure. The aluminum panel + aluminum honeycomb structure is prone to damage under impact load and is difficult to repair effectively.

[0004] Therefore, in order to address the above problems, the present invention urgently needs to provide a sandwich composite material base plate with an interface, a preparation method, a mold, and its application. Summary of the Invention

[0005] The purpose of this invention is to provide a sandwich composite material base plate with an interface, a preparation method, a mold, and its application. By designing a mold for preparing a sandwich composite material base plate with an interface, this invention addresses the technical problem in the prior art where the train equipment compartment base plate uses a single-layer iron plate structure, resulting in a large overall weight, inconvenient maintenance, protection, and replacement operations, and high daily operating costs.

[0006] This invention provides a mold for preparing a sandwich composite material base plate with an interface, comprising a base plate and a cover plate; the upper surface of the base plate has two first embedding grooves spaced apart along its length, and the upper surface of the base plate has two second embedding grooves spaced apart along its width, the first and second embedding grooves being interconnected, and the two first and two second embedding grooves surrounding a laying area; it also includes an inner frame surrounding the laying area, and an outer frame surrounding the inner frame, the outer frame being detachably connected to the base plate; the inner frame includes first core blocks respectively embedded in each of the first embedding grooves for forming C-shaped grooves of the product, the core blocks being embedded in the first embedding grooves, the core blocks being embedded in the first embedding grooves for forming C-shaped grooves of the product ... A second core block is disposed in one of the second embedding slots, with both ends of the second core block abutting against the inner walls of the corresponding first core block. A third inner frame is embedded in another second embedding slot. The inner side of the third inner frame has a third groove, and dovetail protrusions for forming dovetail grooves are arranged along its length in the third groove. A first inner frame is disposed between the first core block and the outer frame, and a second inner frame is disposed between the second core block and the outer frame. One end of each first inner frame abuts against the inner side of the second inner frame, and the other end abuts against the inner side wall of the third inner frame. The inner side wall of the first inner frame has a first groove, and the inner side of the second inner frame has a second groove.

[0007] It also includes a pressure plate located above each first core block, one side of which abuts against the inner wall of the first inner frame (3).

[0008] Preferably, the first core block includes a long strip plate, an upper plate is provided above the long strip plate at intervals, the upper plate and the long strip plate are connected by a connecting plate, and the long strip plate, the connecting plate and the upper plate are surrounded by an inner groove;

[0009] A first guide hole communicating with each first embedding groove is provided on the side wall in the length direction of the base plate, and a second guide hole communicating with each second embedding groove is provided on the side wall in the width direction of the base plate.

[0010] Preferably, the first inner frame includes a lower inner plate and an upper inner plate stacked together. The inner sidewall of the lower inner plate is provided with an upper groove unit. The top of the upper groove unit penetrates the upper plate surface of the lower inner plate. The inner sidewall of the upper inner plate is provided with a lower groove unit. The bottom of the lower groove unit penetrates the lower plate surface of the upper inner plate. The upper groove unit and the lower groove unit surround a first groove.

[0011] The third inner frame includes a bottom inner frame plate, a middle inner frame plate, and a top inner frame plate stacked together; a dovetail protrusion is provided on the inner side wall of the middle inner frame plate.

[0012] Preferably, the outer frame is formed by four outer frame edges, each outer frame edge is made up of 2-3 unit plates spliced ​​together, and the angle between the joint surfaces of two adjacent unit plates is 10-15°.

[0013] Preferably, the first inner frame is composed of 2-3 first unit inner frame panels spliced ​​together, and the joint angle between two adjacent first unit inner frame panels is 10-15°.

[0014] The second inner frame is composed of 2-3 second unit inner frame panels spliced ​​together, and the joint angle between two adjacent second unit inner frame panels is 10-15°.

[0015] The third inner frame is composed of 2-3 third unit inner frame panels spliced ​​together, and the joint angle between two adjacent third unit inner frame panels is 10-15°.

[0016] Preferably, the side wall of the base plate is provided with a lifting lug hole, and a lifting lug is screwed into the lifting lug hole;

[0017] The inner side of the outer frame is angled to the contact surface of the second inner frame;

[0018] The outer frame and the adjacent first inner frame are set at an angle to each other;

[0019] The top surface of the outer frame is provided with screw holes for connecting cover plates at intervals, and the cover plates are detachably connected to the top surface of the outer frame by bolts.

[0020] The base plate has multiple first positioning pins and fixing screw holes for fixing the outer frame at intervals along the outer edge of the plate surface.

[0021] This invention also provides a method for preparing a sandwich composite material base plate with an interface.

[0022] The preparation of a sandwich composite base plate with interfaces using the mold described in any one of the above-mentioned methods includes the following steps:

[0023] S1) Fix the outer frame to the base plate using the first locating pin and bolts;

[0024] S2) First, lay 1-2 layers of carbon fiber prepreg on the upper surface of the first core block in the forward direction, then fill the inner groove with carbon fiber prepreg, and then lay 1-2 layers of carbon fiber prepreg on the upper surface of the first core block in the reverse direction to cover the carbon fiber prepreg filling the inner groove; lay 1-2 layers of carbon fiber prepreg on the dovetail protrusion surface of the inner frame plate; put the laid first core block and inner frame plate into an oven, vacuum it, and heat it at 60°C for 30 minutes;

[0025] S3) Place the first core block after step S2 into the first embedding slot. Using the inner edge of the outer frame as a reference, fix the lower inner plate on the bottom plate. Place the second core block into one of the second embedding slots and place the bottom inner frame plate into the other second embedding slot.

[0026] S4) In the order of [C fabric / 0° / 45° / -45° / 90° / C fabric], lay carbon fiber prepreg in the laying area (103), place the middle inner frame plate on the bottom inner frame plate, and then lay the honeycomb core material. Foam is used to lay the metal embedded parts, and medium-temperature foaming film is used to bond the honeycomb core material and foam splice. The edge of the carbon fiber prepreg is turned up to wrap the edge of the honeycomb core material.

[0027] S5) Using the edge of the core material as a reference, lay carbon fiber prepreg on the honeycomb core material in the order of [C cloth / 0° / 90°]. After laying, fold down the edge of the carbon fiber prepreg to wrap around the edge of the honeycomb core material. Place the top inner frame plate on the middle inner frame plate, place the upper inner plate on the lower inner plate, place the pressure plate on the carbon fiber prepreg, and then lay a layer of PTFE glass cloth and vacuum bag film. Seal, transfer to the oven, evacuate, heat to 50°C, and keep warm for 30 minutes.

[0028] S6) Remove the PTFE glass cloth and vacuum bag film, then lay a layer of C cloth, cover with the cover plate (2), fix with screws, place the assembled mold on the press, heat to 50-60℃ and increase the pressure to 0.3MPa, keep warm for 15-30min, cure, demold, and obtain the sandwich composite material base plate with interface.

[0029] The present invention also provides a sandwich composite material base plate with interface obtained based on the preparation method of the sandwich composite material base plate with interface as described above.

[0030] The present invention also provides an application of a sandwich composite material base plate with an interface as described above in the base plate of a high-speed train equipment compartment.

[0031] The sandwich composite material base plate with interface, its preparation method, mold, and application provided by this invention have the following advantages compared with the prior art:

[0032] 1. The mold provided by this invention for preparing a sandwich composite material base plate with interfaces can produce a sandwich composite material base plate with interfaces through mold design. The design of the first core block and dovetail protrusion allows for the simultaneous integration of C-grooves and dovetail grooves in the sandwich composite material base plate; it can be integrally molded, ensuring a reliable mechanical connection between the base plate and the vehicle body. The separate design of the first core block, second core block, base plate, cover plate, outer frame, and inner frame facilitates installation and disassembly.

[0033] 2. This invention utilizes a method for preparing a sandwich composite material base plate with interfaces. It employs carbon fiber prepreg and a foam / honeycomb composite core material structure to obtain a plate-shaped sandwich composite material base plate. This plate integrates precise C-groove and dovetail groove connection structures, presenting an overall flat plate shape. The simple structure facilitates installation, and the integral molding process results in high strength, enabling reliable mechanical connection between the base plate and the vehicle body structure. Its high density effectively prevents moisture from entering the vehicle's undercarriage space. Furthermore, the composite material provides high impact resistance, excellent corrosion resistance, high durability, and lightweight construction, facilitating maintenance and replacement and reducing daily operating costs.

[0034] 3. This invention utilizes a method for preparing a sandwich composite material base plate with interfaces. It employs carbon fiber prepreg and a foam / honeycomb composite core material structure to obtain a plate-shaped sandwich composite material base plate. This plate integrates precise C-groove and dovetail groove connection structures, presenting an overall flat plate shape. The structure is simple and easy to install. Simultaneously, it is integrally molded, has high strength, and can achieve a reliable mechanical connection between the base plate and the vehicle body structure. Its high density effectively prevents moisture from entering the vehicle's undercarriage space. Furthermore, being made of composite materials, it has high impact resistance, excellent corrosion resistance, high durability, is lightweight, and facilitates maintenance and replacement, thus reducing daily operating costs. Attached Figure Description

[0035] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram (top view) of the mold for the sandwich composite material base plate described in this invention.

[0037] Figure 2 This is a schematic diagram (three-dimensional view) of the structure of the base plate described in this invention.

[0038] Figure 3 for Figure 1 AA section view in the middle;

[0039] Figure 4 for Figure 1 BB section view in the middle;

[0040] Figure 5 This is a schematic diagram (perspective view, with the top cover plate removed) of the mold for the sandwich composite material base plate described in this invention.

[0041] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0042] Figure 7 for Figure 5 Enlarged view of point B in the middle;

[0043] Figure 8 This is a schematic diagram (perspective view, with the top cover plate removed) of the mold for the sandwich composite material base plate described in this invention.

[0044] Figure 9 This is a schematic diagram of the sandwich composite material base plate structure of the present invention;

[0045] Figure 10 for Figure 9 Enlarged view of point C in the middle;

[0046] Figure 11 This is a schematic diagram of the sandwich composite material base plate structure of the present invention;

[0047] Figure 12 for Figure 11 Enlarged view of point D in the middle.

[0048] Explanation of reference numerals in the attached figures:

[0049] 1. Base plate; 2. Cover plate; 101. First embedded groove; 102. Second embedded groove; 103. Laying area; 104. First guide hole; 105. Second guide hole; 106. Lifting lug hole; 107. First positioning pin; 3. First inner frame; 31. Lower inner plate; 32. Upper inner plate; 4. Second inner frame; 5. Third inner frame; 51. Bottom inner frame plate; 52. Middle inner frame plate; 53. Top inner frame plate; 501. Dovetail protrusion; 6. First core block; 61. Long strip plate; 62. Upper plate; 63. Connecting plate; 64. Inner groove; 7. Second core block; 8. Outer frame; 9. Pressure plate; 10. Lifting lug; 91. Plate body; 92. C-shaped groove; 93. Dovetail groove. Detailed Implementation

[0050] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown in the embodiment, a mold for preparing a sandwich composite material base plate with an interface is characterized by: including a base plate 1 and a cover plate 2; the upper surface of the base plate 1 is provided with two first embedding grooves 101 spaced apart along its length direction, and the upper surface of the base plate 1 is provided with two second embedding grooves 102 spaced apart along its width direction, the first embedding grooves 101 and the second embedding grooves 102 are interconnected, and the two first embedding grooves 101 and the two second embedding grooves 102 surround a laying area 103; it also includes an inner frame surrounding the laying area 103, and an outer frame 8 surrounding the inner frame, the outer frame 8 being detachably connected to the base plate 1; the inner frame includes a first core block 6 for forming a product C-shaped groove, which is respectively embedded in each of the first embedding grooves 101, and a second core block 6 embedded in one of the second core blocks 101. The second core block 7 is embedded in the groove 102, and its two ends abut against the inner wall of the corresponding first core block 6. The third inner frame 5 is embedded in another second embedding groove 102. The inner side of the third inner frame 5 is provided with a third groove. The third groove is provided with dovetail protrusions 501 for forming the dovetail groove of the product along its length. The first inner frame 3 is located between the first core block 6 and the outer frame 8. The second inner frame 4 is located between the second core block 7 and the outer frame 8. One end of each first inner frame 3 abuts against the inner side of the second inner frame 4, and the other end abuts against the inner side wall of the third inner frame 5. The inner side wall of the first inner frame 3 is provided with a first groove, and the inner side of the second inner frame 4 is provided with a second groove. The device also includes a pressure plate 9 located above each first core block 6. One side of the pressure plate abuts against the inner side wall of the first inner frame 3.

[0054] The mold provided by this invention for preparing a sandwich composite material base plate with an interface can be prepared by designing the structure of the mold. By designing the first core block 6 and the dovetail protrusion 501, the C-shaped groove and the dovetail groove can be integrated into the sandwich composite material base plate at the same time. It can be integrally prepared to ensure a reliable mechanical connection between the obtained sandwich composite material base plate and the train body.

[0055] The inner frame and the base plate of this invention are movably connected.

[0056] The separate design of the first core block 6, the second core block 7, the base plate 1, the cover plate 2, the outer frame 8, and the inner frame of the present invention facilitates installation and disassembly.

[0057] In this embodiment, the first groove and the second groove are connected.

[0058] like Figure 8 As shown, the first core block 6 in this embodiment includes a long strip plate 61, an upper plate 62 is provided above the long strip plate 61 at intervals, the upper plate 62 and the long strip plate 61 are connected by a connecting plate 63, and the long strip plate 61, the connecting plate 63 and the upper plate 62 are surrounded by an inner groove 64; through the above structural design, the formed product can form a C-shaped groove, and the first core block 6 is designed in a split manner, which facilitates installation and disassembly.

[0059] The inner groove 64 of the present invention is disposed opposite to the first groove.

[0060] like Figure 2 As shown, in this embodiment, a first guide hole 104 communicating with each first embedding groove 101 is provided on the side wall of the base plate 1 in the length direction, and a second guide hole 105 communicating with each second embedding groove 102 is provided on the side wall of the base plate 1 in the width direction, so as to facilitate the outflow of adhesive liquid.

[0061] like Figure 4 As shown, the first inner frame 3 in this embodiment includes a lower inner plate 31 and an upper inner plate 32 stacked together. The inner sidewall of the lower inner plate 31 is provided with a lower groove unit, the top of which penetrates the upper plate surface of the lower inner plate 31. The inner sidewall of the upper inner plate 32 is provided with an upper groove unit, the bottom of which penetrates the lower plate surface of the upper inner plate 32. The upper groove unit and the lower groove unit surround a first groove. The first inner frame 3 is designed in a split manner, which facilitates the laying of fiber prepreg, facilitates subsequent installation and disassembly, and improves work efficiency.

[0062] like Figure 3 As shown, the third inner frame 5 in this embodiment includes a bottom inner frame plate 51, a middle inner frame plate 52 and a top inner frame plate 53 stacked together; a dovetail protrusion 501 is provided on the inner side wall of the middle inner frame plate 52. The design of the third inner frame 5 can form a dovetail groove, and the split design makes it easy to disassemble and install.

[0063] In this embodiment, the outer frame 8 is composed of four outer frame edges, each of which is made up of 2-3 unit plates. The angle between the joint surfaces of two adjacent unit plates is 10-15°, which facilitates the initial installation and subsequent disassembly.

[0064] In this embodiment, the first inner frame 3 is composed of 2-3 first unit inner frame plates spliced ​​together. The joint angle between two adjacent first unit inner frame plates is 10-15°, which facilitates the initial installation and subsequent disassembly.

[0065] The second inner frame 4 is composed of 2-3 second unit inner frame panels spliced ​​together, and the angle between the joint surfaces of two adjacent second unit inner frame panels is 10-15°.

[0066] The third inner frame 5 is composed of 2-3 third unit inner frame panels spliced ​​together, and the joint angle between two adjacent third unit inner frame panels is 10-15°.

[0067] like Figure 2 As shown, the side wall of the base plate 1 in this embodiment is provided with a lifting lug hole 106, and a lifting lug 10 is screwed into the lifting lug hole 106 for easy hoisting.

[0068] In this embodiment, the inner side of the outer frame 8 is angled to the contact surface of the second inner frame 4, which facilitates demolding.

[0069] In this embodiment, the outer frame 8 and the adjacent first inner frame 3 are set at an angle to facilitate demolding.

[0070] In this embodiment, the top surface of the outer frame 8 is provided with screw holes for connecting the cover plate. The cover plate 2 is detachably connected to the top surface of the outer frame 8 by bolts, which facilitates installation and disassembly.

[0071] In this embodiment, the outer edge of the base plate 1 is provided with a plurality of first positioning pins 107 for fixing the outer frame and fixing screw holes for fixing the outer frame, which can improve installation efficiency and ensure installation accuracy.

[0072] This invention also provides a method for preparing a sandwich composite material base plate with an interface, which uses the mold described above for preparing a sandwich composite material base plate with an interface to prepare the sandwich composite material base plate with an interface, and includes the following steps:

[0073] S1) The outer frame 8 is fixed to the base plate 1 by the first positioning pin 107 and bolts;

[0074] S2) First, lay 1-2 layers of carbon fiber prepreg on the upper surface of the first core block 6 in the forward direction, then fill the inner groove 64 with carbon fiber prepreg, and then lay 1-2 layers of carbon fiber prepreg on the upper surface of the first core block 6 in the reverse direction and cover the carbon fiber prepreg filling the inner groove 64; lay 1-2 layers of carbon fiber prepreg on the surface of the dovetail protrusion 501 of the inner frame plate 52; put the laid first core block 6 and the inner frame plate 52 into an oven, evacuate, and heat at 60°C for 30 minutes;

[0075] S3) Place the first core block 6 after step S2 into the first embedding groove 101. Using the inner edge of the outer frame 8 as a reference, fix the lower inner plate 31 onto the bottom plate 1. Place the second core block 7 into one of the second embedding grooves 102 and place the bottom inner frame plate 51 into the other second embedding groove 102.

[0076] S4) In the order of [C fabric / 0° / 45° / -45° / 90° / C fabric], carbon fiber prepreg is laid in the laying area 103. The carbon fiber prepreg covers the first core block 6 and the second core block 7. The middle inner frame plate 52 is placed on the bottom inner frame plate 51, and then the honeycomb core material is laid. Foam is used to lay the metal embedded parts. Medium temperature foaming film is used to bond the honeycomb core material and the foam splice. The edge of the carbon fiber prepreg is turned up to wrap the edge of the honeycomb core material.

[0077] S5) Using the edge of the core material as a reference, lay carbon fiber prepreg on the honeycomb core material in the order of [C cloth / 0° / 90°]. After laying, fold down the edge of the carbon fiber prepreg to wrap around the edge of the honeycomb core material. Place the top inner frame plate 53 on the middle inner frame plate 52, place the upper inner plate 32 on the lower inner plate 31, place the pressure plate 9 on the carbon fiber prepreg, and then lay a layer of PTFE glass cloth and vacuum bag film. Seal, transfer to the oven, vacuum, heat to 50°C, and keep warm for 30 minutes.

[0078] S6) Remove the PTFE glass cloth and vacuum bag film, then lay another layer of C cloth, cover with cover plate 2, fix with screws, place the assembled mold on the press, heat to 50-60℃ and increase the pressure to 0.3MPa, keep warm for 15-30min, cure, demold, and obtain a sandwich composite material base plate with interface.

[0079] In this invention, carbon fiber prepreg is laid in the order of [C-cloth / 0° / 45° / -45° / 90° / C-cloth], and the size of the carbon fiber prepreg laid is 120-200 nm larger than one side of the product.

[0080] The side length of the carbon fiber prepreg decreases by 50 nm from bottom to top, and the reserved dimensions on both sides of the carbon fiber prepreg are consistent during layup.

[0081] The C-fabric of this invention is a carbon fiber prepreg; 0°, 90°, 45°, and -45° are the unidirectional carbon fiber directions in the carbon fiber prepreg.

[0082] The size of the foam is 20-40mm larger on one side than the metal embedded part;

[0083] Assemble the core material with adhesive film onto the bottom plate as required. The foam core material and honeycomb core material are now assembled.

[0084] The folded edge of the carbon fiber prepreg below the core material overlaps with the folded edge of the carbon fiber prepreg above the core material, with an overlap length of not less than 30mm; the overlap positions of each layer should be staggered by a distance of not less than 35mm.

[0085] like Figure 9 , Figure 10 , Figure 11 and Figure 12 As shown, the sandwich composite material base plate with interface obtained by the present invention includes a plate body 91, with C-shaped grooves 92 spaced apart on the lower surface of the plate body 91, each C-shaped groove 92 being close to the side of the plate body 91, and a dovetail groove 93 being provided on one side of the plate body 91 in a length direction.

[0086] This invention discloses a method for preparing a sandwich composite material base plate with interfaces. Using carbon fiber prepreg and a foam / honeycomb composite core material structure, a plate-shaped sandwich composite material base plate is obtained. It integrates precise C-groove and dovetail groove connection structures, presenting an overall flat plate shape. The structure is simple and easy to install. Simultaneously, it is integrally molded, has high strength, and can achieve a reliable mechanical connection between the base plate and the vehicle body structure. Its high density effectively prevents moisture from seeping into the vehicle's undercarriage space. Furthermore, being made of composite materials, it has high impact resistance, excellent corrosion resistance, high durability, is lightweight, and facilitates maintenance and replacement, thus reducing daily operating costs.

[0087] This invention utilizes a method for preparing a sandwich composite material base plate with interfaces, which reduces defects in the tank area through pre-compaction, resulting in a product ultrasonic flaw detection delamination ratio of ≤1.0%.

[0088] This invention provides a method for preparing a sandwich composite material base plate with interfaces, which shortens the overall cycle through staged curing, avoids repeated repairs, and increases production efficiency by 25%.

[0089] This invention provides a method for preparing a sandwich composite material base plate with an interface, which ensures dimensional stability. The dovetail groove movable block and the hydraulic system work together to control the groove size tolerance, which can reach ±0.05mm.

[0090] The application of the sandwich composite material base plate with interface obtained in this embodiment in the equipment compartment base plate of high-speed trains.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mold for preparing a sandwich composite material base plate with an interface, characterized in that: Includes a base plate (1) and a cover plate (2); The upper surface of the base plate (1) is provided with two first embedding grooves (101) spaced apart along its length direction, and the upper surface of the base plate (1) is provided with two second embedding grooves (102) spaced apart along its width direction. The first embedding grooves (101) and the second embedding grooves (102) are connected, and the two first embedding grooves (101) and the two second embedding grooves (102) surround a laying area (103). It also includes an inner frame that encloses the laying area (103), and an outer frame (8) that encloses the outer frame outside the inner frame. The outer frame (8) is detachably connected to the base plate (1). The inner frame includes a first core block (6) for forming a C-shaped groove of the product, which is respectively embedded in each of the first embedding slots (101); a second core block (7) for forming a C-shaped groove of the product, which is embedded in one of the second embedding slots (102); the two ends of the second core block (7) abut against the inner wall of the corresponding first core block (6); and a third inner frame (5) for forming a dovetail groove of the product, which is embedded in another second embedding slot (102). The inner side of the third inner frame (5) is provided with a third groove, and the third groove is provided with dovetail protrusions (501) for forming a dovetail groove of the product along its length. A first inner frame (3) is provided between the first core block (6) and the outer frame (8), and a second inner frame (4) is provided between the second core block (7) and the outer frame (8). One end of each first inner frame (3) abuts against the inner side of the second inner frame (4), and the other end abuts against the inner side wall of the third inner frame (5). The inner side wall of the first inner frame (3) is provided with a first groove, and the inner side of the second inner frame (4) is provided with a second groove. It also includes a pressure plate (9) located above each first core block (6), one side of which abuts against the inner wall of the first inner frame (3).

2. The mold for preparing a sandwich composite material base plate with an interface according to claim 1, characterized in that: The first core block (6) includes a long strip (61), an upper plate (62) is provided above the long strip (61) at intervals, the upper plate (62) and the long strip (61) are connected by a connecting plate (63), and the long strip (61), the connecting plate (63) and the upper plate (62) are surrounded by an inner groove (64).

3. The mold for preparing a sandwich composite material base plate with an interface according to claim 1, characterized in that: A first guide hole (104) communicating with each first embedding groove (101) is provided on the side wall in the length direction of the base plate (1), and a second guide hole (105) communicating with each second embedding groove (102) is provided on the side wall in the width direction of the base plate (1).

4. The mold for preparing a sandwich composite material base plate with an interface according to claim 1, characterized in that: The first inner frame (3) includes a lower inner plate (31) and an upper inner plate (32) stacked together. The inner wall of the lower inner plate (31) is provided with an upper groove unit. The top of the upper groove unit penetrates the upper plate surface of the lower inner plate (31). The inner wall of the upper inner plate (32) is provided with a lower groove unit. The bottom of the lower groove unit penetrates the lower plate surface of the upper inner plate (32). The upper groove unit and the lower groove unit form a first groove. The third inner frame (5) includes a bottom inner frame plate (51), a middle inner frame plate (52) and a top inner frame plate (53) stacked together; a dovetail protrusion (501) is provided on the inner side wall of the middle inner frame plate (52).

5. The mold for preparing a sandwich composite material base plate with an interface according to claim 1, characterized in that: The outer frame (8) is composed of four outer frame edges, each of which is made up of 2-3 unit plates. The angle between the joint surfaces of two adjacent unit plates is 10-15°.

6. The mold for preparing a sandwich composite material base plate with an interface according to claim 1, characterized in that: The first inner frame (3) is spliced ​​together by 2-3 first unit inner frame panels, and the joint surface of two adjacent first unit inner frame panels is 10-15°. The second inner frame (4) is spliced ​​together from 2-3 second unit inner frame panels, and the angle between the joint surfaces of two adjacent second unit inner frame panels is 10-15°. The third inner frame (5) is made up of 2-3 third unit inner frame panels spliced ​​together, and the angle between the joint surfaces of two adjacent third unit inner frame panels is 10-15°.

7. The mold for preparing a sandwich composite material base plate with an interface according to claim 1, characterized in that: The side wall of the base plate (1) is provided with a lifting lug hole (106), and a lifting lug (10) is screwed into the lifting lug hole (106). The inner side of the outer frame (8) is set at an angle to the contact surface of the second inner frame (4); The outer frame (8) and the adjacent first inner frame (3) are set at an angle to each other; The top surface of the outer frame (8) is provided with screw holes for connecting the cover plate at intervals. The cover plate (2) is detachably connected to the top surface of the outer frame (8) by bolts. The base plate (1) has multiple first positioning pins (107) for fixing the outer frame and fixing screw holes for fixing the outer frame at intervals along the outer edge of the upper plate surface.

8. A method for preparing a sandwich composite material base plate with an interface, characterized in that: The preparation of a sandwich composite material base plate with interfaces using the mold for preparing a sandwich composite material base plate with interfaces as described in any one of claims 3-7 includes the following steps: S1) The outer frame (8) is fixed to the base plate (1) by the first positioning pin (107) and bolts; S2) First, lay 1-2 layers of carbon fiber prepreg on the upper surface of the first core block (6) in the forward direction, then fill the inner groove (64) with carbon fiber prepreg, and then lay 1-2 layers of carbon fiber prepreg on the upper surface of the first core block (6) in the reverse direction and cover the carbon fiber prepreg filling the inner groove (64); lay 1-2 layers of carbon fiber prepreg on the surface of the dovetail protrusion (501) of the inner frame plate (52); put the laid first core block (6) and the inner frame plate (52) into the oven, vacuum, and heat at 60°C for 30 minutes; S3) Place the first core block (6) after step S2 into the first embedding slot (101). Using the inner edge of the outer frame (8) as a reference, fix the lower inner plate (31) on the bottom plate (1), place the second core block (7) into one of the second embedding slots (102), and place the bottom inner frame plate (51) into the other second embedding slot (102). S4) In the order of [C fabric / 0° / 45° / -45° / 90° / C fabric], lay carbon fiber prepreg in the laying area (103), place the middle inner frame plate (52) on the bottom inner frame plate (51), and then lay the honeycomb core material. Foam is used to lay the metal embedded parts, and medium-temperature foaming film is used to bond the honeycomb core material and foam splice. The edge of the carbon fiber prepreg is turned up to wrap the edge of the honeycomb core material. S5) Using the edge of the core material as a reference, lay carbon fiber prepreg on the honeycomb core material in the order of [C cloth / 0° / 90°]. After laying, fold down the edge of the carbon fiber prepreg to wrap the edge of the honeycomb core material, place the top inner frame plate (53) on the middle inner frame plate (52), place the upper inner plate (32) on the lower inner plate (31), place the pressure plate (9) on the carbon fiber prepreg, lay a layer of PTFE glass cloth and vacuum bag film, seal, transfer to the oven, vacuum, heat to 50°C, and keep warm for 30 minutes. S6) Remove the PTFE glass cloth and vacuum bag film, then lay a layer of C cloth, cover with the cover plate (2), fix with screws, place the assembled mold on the press, heat to 50-60℃ and increase the pressure to 0.3MPa, keep warm for 15-30min, cure, demold, and obtain the sandwich composite material base plate with interface.

9. A sandwich composite material base plate with an interface, obtained by the preparation method of the sandwich composite material base plate with an interface as described in claim 8.

10. An application of a sandwich composite material base plate with an interface as described in claim 9 in the base plate of a high-speed train equipment compartment.

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