High-performance fiber composite material automobile bottom protection plate and process

Abstract

The invention provides a high-performance fiber composite material automobile bottom protection plate and a process, relates to the field of composite material vehicle parts, and aims to solve the problems that the integration is insufficient and the mechanical synergy performance of the bottom protection plate cannot meet the vehicle protection requirement due to poor connection performance among layers of a current composite bottom protection plate. The connection performance between the middle layer and the face plate layer is remarkably improved through filling of the middle layer and the face plate layer, the connection layer material is melted at high temperature and permeates into a tiny gap between the middle layer and the face plate layer through the infiltration connection technology, so that tight connection between the middle layer and the face plate layer is achieved, a firmer whole is formed between all the layers, and the service life of the middle layer and the face plate layer is prolonged. The phenomenon of layering or stripping is not easy to occur, and the integrity of the bottom guard plate is enhanced; due to the fact that the layers are connected more firmly, the mechanical cooperation performance of the bottom protection plate is improved, and the vehicle protection requirement can be better met.

Description

Technical Field

[0001] The invention relates to the field of composite material vehicle components, and in particular to a high-performance fiber composite material automobile bottom guard plate and a process. Background Art

[0002] When a car is driving, its chassis parts may come into contact with the ground or protrusions on the ground. For example, when the car passes over speed bumps, hits curbs, goes uphill, drives on potholes, or runs over stones or bricks on the road, the bottom of the car is easily hit. The protection strategy for the core component battery can refer to the requirements of the bottoming condition, that is, the bottom of the battery pack is squeezed or impacted by foreign objects. The battery module cannot be significantly squeezed to cause leakage of the battery pack or system, shell rupture, fire or explosion, and the bottoming durability of the battery must be guaranteed. The bottom guard plate of the battery pack of new energy vehicles is usually a very thick reinforced structure or metal structure. Although it can provide certain protection for the battery pack, this type of bottom guard plate usually increases the weight of the vehicle body, thereby increasing driving energy consumption and increasing vehicle use costs.

[0003] The composite solid bottom guard plate in the Chinese patent (publication number: CN 219988662 U) has a metal plate structure of double-sided galvanized steel plate. The characteristics of the metal can be used to ensure that the composite solid bottom guard plate has good shock absorption and buffering effects and effectively protects the battery pack. The first surface layer, the second surface layer and the support portion are all made of continuous fiber thermoplastic prepreg tapes that are melted and hot-pressed in a certain structure to ensure that the composite solid bottom guard plate has high structural strength, stable physical properties, and good protection performance. At the same time, the mass of the composite solid bottom guard plate is effectively reduced, which is beneficial to reducing driving costs. The first surface layer, the second surface layer and the support portion are all melted and hot-pressed to effectively reduce the production cost of the composite solid bottom guard plate, which is beneficial to mass production. However, the connection performance between the layers is poor, resulting in poor integrity, and the mechanical synergy of the bottom guard plate is difficult to meet the vehicle protection requirements. Summary of the invention

[0004] The purpose of the present invention is to provide a high-performance fiber composite material automobile underbody guard plate and process in view of the defects of the prior art. The connection performance between the middle layer and the panel layer is significantly improved through the melt infiltration connection of the connecting layer, especially the filling extending into the guide groove. The melt infiltration connection technology makes the connecting layer material melt at high temperature and penetrate into the tiny gap between the middle layer and the panel layer, thereby achieving a tight connection between the two, forming a more solid whole between the layers, which is less prone to delamination or peeling, thereby enhancing the integrity of the underbody guard plate. Since the connection between the layers is more solid, the mechanical synergy of the underbody guard plate is improved, which can better meet the protection needs of the vehicle.

[0005] The first object of the present invention is to provide a high-performance fiber composite material automobile underbody guard plate, which adopts the following scheme:

[0006] include:

[0007] The middle layer is provided with guide grooves sunken on the surfaces of both sides of the middle layer;

[0008] The panel layer is distributed on both sides of the middle layer. The panel layer includes a plurality of composite single layers stacked in sequence. The composite single layer is formed by a reinforced fiber composite matrix resin. The matrix resin content of the composite single layer increases layer by layer in a direction close to the middle layer.

[0009] The connecting layer is arranged between the middle layer and the panel layer and connected by infiltration. The connecting layer extends into and fills the guide groove.

[0010] Furthermore, the reinforcing fibers are formed into a multi-dimensional three-dimensional woven structure by mixing one or more fibers to form a preform single layer, and then compounded with a matrix resin to form a composite single layer.

[0011] Furthermore, the matrix resin is a thermoplastic resin.

[0012] Furthermore, the cross section of the guide groove is in an inverted T shape, and the guide grooves are distributed in a grid shape on each side surface of the middle layer.

[0013] Furthermore, the middle plate adopts a metal plate or a composite honeycomb core structure.

[0014] Furthermore, the connecting layer is a membrane structure, and short-cut fibers are mixed inside to strengthen the connecting layer matrix.

[0015] Furthermore, the connection layer matrix is ​​made of the same material as the matrix resin, and the length of the short-cut fibers is smaller than the thickness of the connection layer matrix.

[0016] Furthermore, both sides of the intermediate layer are connected with panel layers through the infiltration of connecting layers, and an integral structure is formed through secondary co-solidification.

[0017] The second object of the present invention is to provide a production process for a high-performance fiber composite material automobile underbody guard plate, and the processing of the high-performance fiber composite material automobile underbody guard plate as described in the first object comprises:

[0018] Connecting layers are arranged on both sides of the middle layer, and the connecting layers are extended into and filled in the guide groove;

[0019] The composite single layer of each panel layer is independently composite-molded, the matrix resin content of the composite single layer is controlled, and the composite single layer is stacked in order from low to high matrix resin content to obtain the panel layer;

[0020] The panel layer is superimposed on each connection layer on both sides of the middle layer, and secondary co-solidification infiltration connection is performed to obtain the overall structure of the bottom guard plate.

[0021] Further, when the panel layer is laminated to the connecting layer, the composite single layer with the lowest matrix resin content contacts the connecting layer.

[0022] Compared with the prior art, the present invention has the following advantages and positive effects:

[0023] In view of the problem that the connection performance between the layers of the current composite underbody guard plate is poor, resulting in insufficient integrity and the mechanical synergy of the underbody guard plate is difficult to meet the vehicle protection needs, the connection performance between the middle layer and the panel layer is significantly improved through the melt infiltration connection of the connecting layer, especially the filling extending into the guide groove. The melt infiltration connection technology melts the connecting layer material at high temperature and penetrates into the tiny gap between the middle layer and the panel layer, thereby achieving a tight connection between the two, forming a more solid whole between the layers, which is less prone to delamination or peeling, and enhancing the integrity of the underbody guard plate. Since the connection between the layers is more solid, the mechanical synergy of the underbody guard plate is improved, which can better meet the vehicle protection needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 Schematic diagram of the high-performance fiber composite vehicle underbody guard plate in Examples 1-6 of the present invention.

[0026] Figure 2 Schematic diagram of the intermediate layer and the connecting layer in Examples 1-6 of the present invention.

[0027] Figure 3 Schematic diagram of the panel layer in Examples 1-6 of the present invention.

[0028] Figure 4 Schematic diagram of the distribution of guide grooves on the middle layer in Examples 1-6 of the present invention.

[0029] Figure 5 Schematic diagram of the grid-like distribution of the guide grooves on the middle layer in Examples 1-6 of the present invention.

[0030] Among them, 1. panel layer; 2. connecting layer; 3. middle layer; 4. guide groove; 5. first composite single layer; 6. second composite single layer; 7. third composite single layer. DETAILED DESCRIPTION

[0031] Example 1

[0032] In a typical embodiment of the present invention, Figure 1-Figure 5 As shown, a high-performance fiber composite vehicle underbody guard plate is provided.

[0033] The current automobile underbody guard plate is made of composite materials, but the connection performance between the layers is poor, resulting in insufficient integrity, and the mechanical synergy of the underbody guard plate is difficult to meet the vehicle protection requirements. Based on this, this embodiment proposes a high-performance fiber composite automobile underbody guard plate, which aims to improve the connection performance between the layers and the overall integrity to meet the vehicle protection requirements.

[0034] like Figure 1 As shown, the high-performance fiber composite material automobile underbody guard plate includes an intermediate layer 3, a panel layer 1 and a connecting layer 2, wherein the intermediate layer 3 is provided with guide grooves 4 recessed in the surfaces on both sides of the intermediate layer 3, and the guide grooves 4 serve as channels for the infiltration of the connecting layer 2 to enhance the connection between the intermediate layer 3 and the panel layer 1. The panel layer 1 is distributed on both sides of the intermediate layer 3, and the panel layer 1 on each side of the intermediate layer 3 includes multiple composite single layers stacked in sequence. The composite single layer is formed by a reinforced fiber composite matrix resin.

[0035] The matrix resin content of the composite single layer increases layer by layer along the direction close to the middle layer 3. The composite single layer far away from the middle layer 3 contacts the external environment, so that the composite single layer with high matrix resin content provides better wear resistance and impact resistance, protecting the bottom guard plate from direct impact of external objects, and the matrix resin content of the composite single layer close to the middle layer 3 gradually decreases, which can reduce the overall weight of the material while maintaining sufficient strength. The gradient design allows the material to meet the strength requirements while reducing weight.

[0036] The connection layer 2 is arranged between the middle layer 3 and the panel layer 1. Through the infiltration connection, the strong connection between the middle layer 3 and the panel layer 1 is ensured. The connection layer 2 extends into the guide groove 4 and fills it, further enhancing the integrity and connection strength of the structure. Through the infiltration connection of the connection layer 2, especially the filling extending into the guide groove 4, the connection performance between the middle layer 3 and the panel layer 1 is significantly improved, and the integrity of the bottom guard plate is enhanced. Since the connection between the layers is more firm, the mechanical synergy performance of the bottom guard plate is improved, which can better meet the vehicle protection requirements.

[0037] like Figure 1 As shown, the panel layer 1 adopts a resin content gradient distribution design from the side away from the middle layer 3 to the side close to the middle layer 3. The composite single layer close to the middle layer 3 has a relatively low resin matrix content, which is then connected to the connecting layer 2 by secondary co-solidification infiltration. The middle layer 3 adopts a metal plate or a composite honeycomb core structure to achieve infiltration connection with the contact interface of the connecting layer 2, and finally the layers of the bottom guard plate form an integral structure. Figure 2 and Figure 4As shown, the cross section of the guide groove 4 is inverted T-shaped, including a horizontal groove and a vertical groove. The vertical groove is connected to the middle section of the horizontal groove, and the horizontal groove is embedded in the middle layer 3. The vertical groove connects the horizontal groove with the outside, so that the connection layer 2 can flow into the horizontal groove through the vertical groove, so that the connection layer 2 fills the entire guide groove 4. Figure 5 As shown, the guide grooves 4 are distributed in a grid shape on each side surface of the middle layer 3 .

[0038] Infiltration connection achieves a tight connection between the middle layer 3 and the panel layer 1 by melting the connection layer 2 material at high temperature and penetrating into the tiny gap between the middle layer 3 and the panel layer 1. The structural integrity of the bottom guard plate is significantly enhanced, so that each layer forms a more solid whole, and it is not easy to delaminate or peel. Since the connection layer 2 formed by the infiltration connection can be evenly distributed on the contact surface between the middle layer 3 and the panel layer 1, and forms a chemical bond or physical lock with the two, the connection strength is significantly improved. The bottom guard plate can better withstand and disperse stress when impacted by external forces, thereby improving its impact resistance and durability.

[0039] During the infiltration connection process, the melting and penetration of the material of the connection layer 2 helps to form a more uniform and dense contact interface. This interface structure helps to improve the thermal conductivity of the underbody guard, allowing heat to be transferred between the layers more quickly, improving the heat dissipation efficiency of the underbody guard, extending its service life, and maintaining the stable operation of the vehicle chassis system.

[0040] The panel layer 1 is composed of multiple layers of superimposed composite monolayers, wherein the reinforcing fibers are a mixture of one or more high-strength and high-toughness fibers such as glass fiber, carbon fiber, and aramid fiber, and then the reinforcing fibers are formed into a multi-dimensional three-dimensional woven fabric preform monolayer, and the preform monolayer can be composited with a matrix resin to form a composite monolayer. The preform monolayers are composited with different resin contents to obtain multiple layers of composite monolayers with different matrix resin contents. The composite monolayers are then stacked to form a panel layer 1 with a gradient distribution of matrix resin.

[0041] like Figure 3As shown, the resin gradient distribution design in the composite single-layer laminated structure of the panel layer 1 sets a gradient distribution of the matrix resin content from high to low from the outer surface to the inside. In this embodiment, from the direction away from the middle layer 3 to the direction close to the middle layer 3, the panel layer 1 located on both sides of the middle layer 3 is a three-layer structure: the first composite single layer 5, the second composite single layer 6 and the third composite single layer 7, and the matrix resin content is designed to be 50%, 40% and 30%. The reinforcing fibers in the three-layer composite single layer can be selected from one or more of the above-mentioned high-strength and high-toughness fibers to form a mixed three-dimensional woven structure, and the woven structure can be designed in any one or more structures of three-dimensional four-way, three-dimensional five-way, three-dimensional six-way or three-dimensional seven-way, and the fiber mixing ratio is adjusted according to the design requirements. Among them, the total thickness of the panel layer 1 is controlled within the range of 1mm-2mm, wherein the thickness of the first composite single layer 5 is controlled within the range of 0.2mm-0.6mm, the thickness of the second composite single layer 6 is controlled within the range of 0.2mm-0.6mm, and the thickness of the third composite single layer 7 is controlled within the range of 0.4mm-1.2mm.

[0042] Specifically, Figure 3 As shown, the first composite single layer 5 contacts the external environment, thereby utilizing the first composite single layer 5 with a high matrix resin content to provide better wear resistance and impact resistance, protecting the bottom guard plate from direct impact of external objects, and the matrix resin content of the third composite single layer 7 close to the middle layer 3 gradually decreases, which can reduce the overall weight of the material while maintaining sufficient strength.

[0043] The internal third composite single layer 7 is connected to the connection layer 2 through secondary co-solidification infiltration, which can form a firm connection interface and improve the connection strength and stability of the overall structure.

[0044] The glass fiber in the reinforcing fiber of the panel layer 1 is selected from high-strength glass fiber, the carbon fiber can be selected from any one of T300, T700, T800, and T1000, and the aramid fiber can be selected from any one of K29, K49, and K129.

[0045] The resin matrix of the panel layer 1 is made of thermoplastic resin, and any type of resin such as polypropylene, polystyrene, polyethylene, polyetherketone, polyetheretherketone, polyurethane, polyoxymethylene, polyphenylene sulfide, ABS, PET, PETG, etc. can be selected, and is not limited to the above thermoplastic resin types.

[0046] The three-layer structure of the panel layer 1 is formed by independent single-layer composite molding to control the matrix resin content of the composite single layer. The three composite single layers are then laminated and combined, and then overlapped with the connecting layer 2 for secondary co-curing melt infiltration connection.

[0047] like Figure 2As shown, the connection layer 2 is formed of a membrane structure using the same type of membrane material as the resin matrix in the panel layer 1, and a chopped fiber reinforced matrix in the range of 10-20% is added to the membrane structure, and the chopped fiber adopts any type of the above-mentioned high-strength carbon fiber, wherein the length of the chopped fiber is controlled within the range of 0.05mm-0.1mm and can be flexibly adjusted according to the connection strength design requirements. The thickness of the membrane connection layer 2 is controlled within the range of 0.1mm-0.2mm and can be flexibly adjusted according to the infiltration connection strength design.

[0048] The middle layer 3 can be composed of a metal plate or a composite honeycomb core structure, wherein the metal plate is made of steel, manganese steel, or aluminum alloy, and the composite honeycomb core can be made of a variety of materials such as aluminum honeycomb, polypropylene honeycomb core, or aramid honeycomb core, and is not limited to this type, wherein the thickness of the metal plate or the composite honeycomb core is controlled within the range of 0.5mm-2mm and can be flexibly adjusted.

[0049] The metal plate of the middle layer 3 is provided with a guide groove 4, the cross-sectional shape of the guide groove 4 is an inverted T-shape, the depth of the guide groove 4 is controlled within the range of 0.1mm-0.2mm, and the guide groove 4 forms a grid-like distribution on the surface of the metal plate. During the secondary co-curing connection, the guide groove 4 contacts the surface of the connecting layer 2 so that the film material of the connecting layer 2 melts and penetrates smoothly and fills the entire guide groove 4, so that the layers of the bottom guard plate form an integral structure.

[0050] The panel layer 1 adopts a three-dimensional woven structure of mixed fibers, which effectively improves the structural rigidity and impact resistance of the bottom guard plate surface. The middle layer 3 adopts two schemes of metal material or composite honeycomb structure to improve the flexibility of overall structure selection. At the same time, the inverted T-shaped guide groove 4 design is adopted on the surface of the metal middle layer 3 material, which can effectively achieve the purpose of weight reduction. At the same time, the structure realizes the secondary solidification connection strength between multi-layer materials. The composite melt infiltration film layer is combined with the secondary co-solidification connection technology to form an overall structure by composite melt infiltration co-solidification connection of the panel layer 1 and the middle layer 3, which improves the mechanical synergy of the composite bottom guard plate while achieving weight reduction.

[0051] In this embodiment 1, Figure 1 It is a schematic diagram of the cross-sectional structure of a high-performance fiber composite material automobile underbody guard plate after molding, forming a panel layer 1, an intermediate layer 3 composed of a metal plate or a composite honeycomb core structure, and a connecting layer 2 between the panel layer 1 and the intermediate layer 3. Figure 2 It is a schematic diagram of the intermediate layer 3 and the connecting layer 2, wherein the intermediate layer 3 is a metal plate intermediate layer 3 with an inverted T-shaped guide groove 4, wherein the connecting layer 2 is between the panel layer 1 and the intermediate layer 3, wherein the inverted T-shaped guide groove 4 on the surface of the intermediate layer 3 forms an integral structure with the connecting layer 2. Figure 3It is a schematic diagram of a three-layer structure of a panel layer 1 located on both sides of an intermediate layer 3. The panel layer 1 includes a first composite single layer 5, a second composite single layer 6 and a third composite single layer 7 stacked in sequence. Figure 4 It is a schematic diagram of the lateral structure of the guide groove 4 on the surface of the middle layer 3 of the metal plate, wherein inverted T-shaped guide grooves 4 are respectively provided on both sides of the middle layer 3. Figure 5 It is a schematic diagram showing that the inverted T-shaped guide grooves 4 are distributed in the middle layer 3 .

[0052] Example 2

[0053] In another typical embodiment of the present invention, Figure 1-Figure 5 As shown, a production process of a high-performance fiber composite material automobile underbody guard plate is provided, using the high-performance fiber composite material automobile underbody guard plate as in Example 1.

[0054] A production process for a high-performance fiber composite vehicle underbody guard plate, comprising:

[0055] The connection layers 2 are arranged on both sides of the middle layer 3, and the connection layers 2 extend into and fill the guide groove 4;

[0056] The composite single layers of each panel layer 1 are independently composite-molded, the matrix resin content of the composite single layers is controlled, and the composite single layers are stacked in order from low to high matrix resin content to obtain the panel layer 1;

[0057] The panel layer 1 is superimposed on each connection layer 2 on both sides of the middle layer 3, and secondary co-solidification infiltration connection is performed to obtain the overall structure of the bottom guard plate.

[0058] When the panel layer 1 is laminated to the connecting layer 2 , the composite single layer with the lowest matrix resin content contacts the connecting layer 2 .

[0059] Example 3

[0060] In another typical embodiment of the present invention, Figure 1-Figure 5 As shown, a high-performance fiber composite vehicle underbody guard plate is provided.

[0061] A high-performance fiber composite material automobile underbody guard plate specifically comprises: a panel layer 1, an intermediate layer 3 composed of a metal plate or a composite honeycomb core structure, and a connecting layer 2 between the panel layer 1 and the intermediate layer 3.

[0062] The panel layer 1 adopts a polypropylene resin matrix, and its content is gradiently distributed from the outer surface to the inside as 50%, 40%, and 30%. The outer surface layer with a thickness of 1 mm adopts a three-dimensional four-directional high-strength glass fiber woven structure; the middle layer 3 with a thickness of 0.2 mm adopts a three-dimensional five-directional T300 carbon fiber woven structure; the inner layer with a thickness of 0.4 mm adopts a three-dimensional six-directional K29 aramid fiber woven structure.

[0063] The panel layer 1 is a three-layer composite single layer. After the three-layer structure is independently composited by a single layer, a polypropylene resin film with 10% 0.05mm long short-cut T300 carbon fiber added is used for interface infiltration. The thickness of the resin film infiltration layer is 0.1mm.

[0064] A stainless steel plate with a thickness of 0.5 mm and a cross-sectional inverted T-shaped flow guide groove 4 with a depth of 0.1 mm is used as the middle layer 3, wherein the flow guide groove 4 is distributed in a grid shape on the surface of the middle layer 3. During the secondary co-curing connection, the flow guide groove 4 contacts the surface of the connection layer 2 so that the film layer material melts and penetrates smoothly and fills the entire flow guide layer, so that each layer of the bottom guard plate forms an integral structure.

[0065] Example 4

[0066] In another typical embodiment of the present invention, Figure 1-Figure 5 As shown, a high-performance fiber composite vehicle underbody guard plate is provided.

[0067] A high-performance fiber composite material automobile underbody guard plate specifically comprises: a panel layer 1, an intermediate layer 3 composed of a metal plate or a composite honeycomb core structure, and a connecting layer 2 between the panel layer 1 and the intermediate layer 3.

[0068] The panel layer 1 adopts a polyetheretherketone resin matrix, and its content is gradiently distributed from the outer surface to the inside as 50%, 40%, and 30%. The outer surface layer with a thickness of 2 mm adopts a three-dimensional five-directional T700 carbon fiber woven structure; the middle layer 3 with a thickness of 0.3 mm adopts a three-dimensional six-directional high-strength glass fiber woven structure; the inner layer with a thickness of 0.8 mm adopts a three-dimensional seven-directional K49 aramid fiber woven structure.

[0069] Panel layer 1 is a three-layer composite single layer. After the three-layer structure is independently composited by a single layer, a polyetheretherketone resin film with 15% 0.08mm long short-cut T700 carbon fiber added is used for interface infiltration. The thickness of the resin film infiltration layer is 0.15mm.

[0070] A manganese steel alloy plate with a thickness of 0.58 mm and a cross-sectional inverted T-shaped guide groove 4 with a depth of 0.15 mm is used as the middle layer 3, wherein the guide groove 4 is distributed in a grid shape on the surface of the middle layer 3. During the secondary co-solidification connection, the guide groove 4 contacts the surface of the connection layer 2 so that the film layer material melts and penetrates smoothly and fills the entire guide layer, so that each layer of the bottom guard plate forms an integral structure.

[0071] Example 5

[0072] In another typical embodiment of the present invention, Figure 1-Figure 5 As shown, a high-performance fiber composite vehicle underbody guard plate is provided.

[0073] A high-performance fiber composite material automobile underbody guard plate specifically comprises: a panel layer 1, an intermediate layer 3 composed of a metal plate or a composite honeycomb core structure, and a connecting layer 2 between the panel layer 1 and the intermediate layer 3.

[0074] The panel layer 1 adopts a polyurethane resin matrix, and its content is gradiently distributed from the outer surface to the inside as 50%, 40%, and 30%. The outer surface layer with a thickness of 1.6 mm adopts a three-dimensional seven-directional K129 aramid fiber woven structure; the middle layer 3 with a thickness of 0.25 mm adopts a three-dimensional four-directional T800 carbon fiber woven structure; the inner layer with a thickness of 0.9 mm adopts a three-dimensional four-directional high-strength glass fiber woven structure.

[0075] Panel layer 1 is a three-layer composite single layer. After the three-layer structure is independently composited by a single layer, a polyurethane resin film with 18% 0.07mm long chopped T800 carbon fiber is added for interface infiltration. The thickness of the resin film infiltration layer is 0.18mm.

[0076] An aluminum honeycomb core plate with a thickness of 0.55 mm is used as the middle layer 3, and the resin film forms a transition infiltration layer inside the honeycomb core material through interface infiltration, so that each layer of the bottom guard plate forms an integral structure.

[0077] Example 6

[0078] In another typical embodiment of the present invention, Figure 1-Figure 5 As shown, a high-performance fiber composite vehicle underbody guard plate is provided.

[0079] A high-performance fiber composite material automobile underbody guard plate specifically comprises: a panel layer 1, an intermediate layer 3 composed of a metal plate or a composite honeycomb core structure, and a connecting layer 2 between the panel layer 1 and the intermediate layer 3.

[0080] The panel layer 1 adopts a PETG resin matrix, and its content is gradiently distributed from the outer surface to the inside as 50%, 40%, and 30%. The outer surface layer with a thickness of 1.8 mm adopts a three-dimensional seven-directional high-strength glass fiber woven structure; the middle layer 3 with a thickness of 0.6 mm adopts a three-dimensional seven-directional K29 aramid fiber woven structure; the inner layer with a thickness of 1.2 mm adopts a three-dimensional four-directional T1000 carbon fiber woven structure.

[0081] The panel layer 1 is a three-layer composite single layer. After the three-layer structure is independently composited by a single layer, a PETG resin film with 20% 0.1mm long chopped T1000 carbon fiber added is used for interface infiltration. The thickness of the resin film infiltration layer is 0.2mm.

[0082] An aluminum alloy plate with a thickness of 2 mm and a cross-sectional inverted T-shaped guide groove 4 with a depth of 0.15 mm is used as the middle layer 3, wherein the guide groove 4 is distributed in a grid-like manner on the surface of the middle layer 3. During the secondary co-solidification connection, the guide groove 4 contacts the surface of the connection layer 2 so that the film layer material melts and penetrates smoothly and fills the entire guide layer, so that each layer of the bottom guard plate forms an integral structure.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-performance fiber composite material automobile underbody guard plate, characterized in that: include: The middle layer is provided with guide grooves sunken on the surfaces of both sides of the middle layer; The panel layer is distributed on both sides of the middle layer. The panel layer includes a plurality of composite single layers stacked in sequence. The composite single layer is formed by a reinforced fiber composite matrix resin. The matrix resin content of the composite single layer increases layer by layer in a direction close to the middle layer. The connecting layer is arranged between the middle layer and the panel layer and connected by infiltration. The connecting layer extends into and fills the guide groove.

2. The high-performance fiber composite material automobile underbody guard plate according to claim 1, characterized in that: The reinforcing fibers are formed into a multi-dimensional three-dimensional woven structure by mixing one or more fibers to form a preformed single layer, and then compounded with a matrix resin to form a composite single layer.

3. The high-performance fiber composite vehicle underbody guard plate according to claim 1 or 2, characterized in that: The matrix resin is thermoplastic resin.

4. The high-performance fiber composite material automobile underbody guard plate according to claim 1, characterized in that: The cross section of the guide groove is in an inverted T shape, and the guide grooves are distributed in a grid shape on each side surface of the middle layer.

5. The high-performance fiber composite material automobile underbody guard plate according to claim 4, characterized in that: The middle plate adopts a metal plate or a composite honeycomb core structure.

6. The high-performance fiber composite material automobile underbody guard plate according to claim 1, characterized in that: The connecting layer is a film-like structure, and short-cut fibers are mixed inside to strengthen the connecting layer matrix.

7. The high-performance fiber composite material automobile underbody guard plate according to claim 6, characterized in that: The connecting layer matrix is ​​made of the same material as the matrix resin, and the length of the short-cut fibers is smaller than the thickness of the connecting layer matrix.

8. The high-performance fiber composite material automobile underbody guard plate according to claim 1, characterized in that: The two sides of the middle layer are respectively connected with the panel layers through the infiltration of the connection layer, and an integral structure is formed through secondary co-solidification.

9. A process for producing a high-performance fiber composite vehicle underbody panel as claimed in any one of claims 1 to 8, characterized in that: include: Connecting layers are arranged on both sides of the middle layer, and the connecting layers are extended into and filled in the guide groove; The composite single layer of each panel layer is independently composite-molded, the matrix resin content of the composite single layer is controlled, and the composite single layer is stacked in order from low to high matrix resin content to obtain the panel layer; The panel layer is superimposed on each connection layer on both sides of the middle layer, and secondary co-solidification infiltration connection is performed to obtain the overall structure of the bottom guard plate.

10. The production process of the high-performance fiber composite material automobile underbody guard plate according to claim 9, characterized in that: When the facesheet layers are laminated to the tie layer, the composite monolayer with the lowest matrix resin content contacts the tie layer.

Images