WO2021128799A1

WO2021128799A1 - Carbon fiber composite material seat backrest frame and design method therefor

Info

Publication number: WO2021128799A1
Application number: PCT/CN2020/100433
Authority: WO
Inventors: 顾勇涛; 刘斌; 白校仲; 江峰
Original assignee: 江苏亨睿碳纤维科技有限公司
Priority date: 2019-12-25
Filing date: 2020-07-06
Publication date: 2021-07-01
Also published as: CN111055739A

Abstract

A carbon fiber composite material seat backrest frame and a design method therefor. The carbon fiber composite material seat backrest frame comprises a frame body (1); the frame body (1) comprises wrapped buckle ring mounting surfaces (11), metal part mounting surfaces (12), and recliner mounting surfaces (13); there are two wrapped buckle ring mounting surfaces (11) that are symmetrically provided on the frame body (1); there are two metal part mounting surfaces (12) that are symmetrically provided on the frame body (1); there are two recliner mounting surfaces (13) that are symmetrically provided on the frame body (1); and three laying regions having different thicknesses are laid on the frame body (1).

Description

Carbon fiber composite material seat back frame and design method thereof

Technical field

The invention relates to the technical field of automobile seats, in particular to a carbon fiber composite material seat back frame and a design method thereof.

Background technique

As a new type of high-strength, high-modulus fiber material, carbon fiber composite material is lighter than aluminum and stronger than steel. Carbon fiber composite material has flexible design and diverse molding processes.

With the development of the automotive industry, the requirements for lightweight auto parts are becoming more and more stringent, and carbon fiber composite materials that are lighter than metal are used more and more in car seats. As a safety component to reduce damage, the seat plays a decisive role in protecting the occupants, making it an important component in automobile safety research. The static strength and impact strength of car seat safety performance are two main aspects. According to the provisions of GB15083 "Car seat system strength requirements and test methods", the respective centroids of the backrests are applied horizontally and 20 times their weight. Under load and impact strength caused by frontal collision, occupants are not allowed to slip out of the seat belt, seat parts and stop and adjustment devices are not allowed to be broken or broken, they are allowed to bend, and the backrest release device (two doors) remains Need to keep the function intact. The seat using carbon fiber composite material can greatly improve the safety performance of the seat and reduce the damage to the human body caused by the collision of the accident. However, the current car seat frame made of carbon fiber composite material may be complicated to manufacture, and the integrity is not high, and the physical properties such as the high strength and high modulus of the carbon fiber composite material are not effectively utilized. In order to meet the requirements of lightweight car seat frames and maximize the mechanical properties of carbon fiber composite materials, a design method of carbon fiber composite seat back frames has become a top priority.

Summary of the invention

The main technical problem solved by the present invention is to provide a carbon fiber composite seat back frame and a design method thereof in view of the shortcomings of the prior art, which can meet the requirements of lightweight car seat frame and make greater use of the carbon fiber composite material. The mechanical performance reduces the car seat frame parts and enhances the integrity of the car seat.

In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a carbon fiber composite seat back frame, including a frame body, the frame body contains a package buckle mounting surface, a metal part mounting surface and an angle adjuster Mounting surface; the wrapping buckle mounting surface has two, symmetrically arranged on the frame body; the metal fittings mounting surface has two, symmetrically arranged on the frame body; the angle adjuster mounting surface has Two, symmetrically arranged on the skeleton body; three paving areas with different thicknesses are laid on the skeleton body.

In a preferred embodiment of the present invention, the paving material of the three plies of different thicknesses is carbon fiber fabric prepreg or biaxial warp knitted fabric prepreg.

In a preferred embodiment of the present invention, the laying material of the bottom layer and the surface layer of the three paving areas with different thicknesses is carbon fiber fabric prepreg, and the laying of the inner layers of the three paving areas with different thicknesses The material is biaxial warp knitted fabric prepreg.

In a preferred embodiment of the present invention, the laying angles of the three paving areas with different thicknesses are divided into a combination of 0°/90° layer and ±45° layer.

In a preferred embodiment of the present invention, the laying ratio of the 0°/90° layer to the ±45° layer is 57% and 43%.

In a preferred embodiment of the present invention, the three layers of different thicknesses are divided into a normal area, a first stress concentration area and a second stress concentration area. The normal area is the surface area of the skeleton body, and the first A stress concentration area is a side wing area of the frame body, and the second stress concentration area is an area of two metal parts mounting surfaces.

In a preferred embodiment of the present invention, the laying thickness of the common zone is 2.4 mm, the laying thickness of the first stress concentration zone is 4.0 mm, and the laying thickness of the second stress concentration zone is 5.6 mm.

A method for designing a carbon fiber composite seat back frame is also provided, which includes the following steps:.

(100) Structural design: Design the appearance and installation surfaces of the skeleton body according to the assembly environment and appearance structure requirements of the carbon fiber composite seat back frame, including sequential design input, scheme design, calculation and testing, and verification of compliance Design requirements steps; if not met, return to the program design steps; if met, complete the design;

(200) Lay-up design: define the ply sequence according to the carbon fiber ply design rules and different thickness areas;

(300) Strength calculation: refer to the designed model and pavement-use ABAQUS for simulation design-finite element calculation-analysis results.

In a preferred embodiment of the present invention, the finite element calculation includes establishing a mesh model, defining material and section properties, boundary conditions and loads.

In a preferred embodiment of the present invention, the analysis result is to analyze the strength and stiffness of the carbon fiber seat back frame under different working conditions, and iteratively calculate the optimal strength and stiffness results.

The beneficial effects of the present invention are: it can meet the requirements of lightweight car seat frame, and make greater use of the mechanical properties of the carbon fiber composite material, reduce car seat frame parts, and enhance the integrity of the car seat.

Description of the drawings

Figure 1 is a schematic structural view of a carbon fiber composite seat back frame of the present invention;

Fig. 2 is a schematic diagram of the back frame of a carbon fiber composite seat backrest shown in Fig. 1 after layering;

Figure 3 is a structural design flow chart of a carbon fiber composite seat back frame shown in Figure 1;

Figure 4 is a flow chart of the layup design of a carbon fiber composite seat back frame shown in Figure 1;

Fig. 5 is a test diagram of a carbon fiber composite seat back frame shown in Fig. 1 under the condition of applying torque;

The markings of the components in the drawings are as follows: 1. The frame body, 11. The mounting surface of the package buckle, 12. The mounting surface of the metal parts, 13. The mounting surface of the angle adjuster, 21, the general area, 22, the first stress concentration area, 23. The second stress concentration zone.

Detailed ways

The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so that the protection scope of the present invention can be more clearly defined.

Please refer to Figures 1 to 5, the embodiments of the present invention include:

A carbon fiber composite seat back frame, as shown in Fig. 1 and Fig. 2, includes a frame body 1. The frame body 1 includes a wrapping buckle mounting surface 11, a metal fitting mounting surface 12, and an angle adjuster mounting surface 13 There are two package buckle mounting surfaces 11, which are symmetrically arranged on the frame body 1, located in the headrest area, and are glued to the package buckle for fixing the package soft bag inside the seat; the metal piece There are two mounting surfaces 12, which are symmetrically arranged on the frame body 1, and are screwed to metal parts for fixing the carbon fiber composite seat back frame; the angle adjuster mounting surface 13 has two mounting surfaces, which are symmetrically arranged on the seat back frame. The frame body 1 is used to install an angle adjuster. The outer surface of the frame body 1 shown is smooth as a whole, with natural transition, visible to rear passengers, and ergonomics. The three mounting surfaces (wrap buckle mounting surface 11, metal fitting mounting surface 12, and angle adjuster mounting surface 13) of the frame body 1 shown are suitable for assembly with environmental components, and the installation is simple and detachable. The whole skeleton is a whole, it is neither a simple combination of simple carbon fiber rods, nor a heavy metal shell, but a transitional natural shape structure with local reinforcement and thickening, which has a higher integrity.

The skeleton body 1 is laid with three paving areas of different thicknesses; the three paving areas of different thicknesses are divided into a common area 21, a first stress concentration area 22, and a second stress concentration area 23. The common area 21 It is the surface area of the skeleton body 1, the first stress concentration area 22 is the side wing area of the skeleton body 1, and the second stress concentration area 23 is the area of the two metal component mounting surfaces 12.

The paving material of the three plies of different thicknesses is carbon fiber fabric prepreg or biaxial warp knitted fabric prepreg. Specifically: the paving material of the bottom layer and the surface layer of the three paving areas of different thicknesses is carbon fiber fabric prepreg, and the paving material of the inner layer of the three paving areas of different thicknesses is biaxial warp knitting物Prepreg.

During laying, the laying angles of the three layers of different thicknesses are divided into two combinations of 0°/90° layer and ±45° layer. The laying ratio of the 0°/90° layer to the ±45° layer is 57% and 43%, the laying thickness of the common zone is 2.4mm, and the laying thickness of the first stress concentration zone is 4.0mm, The laying thickness of the second stress concentration zone is 5.6 mm. Specifically: the first layer (P1), the ordinary area 21, the first stress concentration area 22 and the second stress concentration area 23 are laid at a laying angle of 0°/90°; the second layer (P2) is laid at ±45° Laying angle Laying the normal area 21, the first stress concentration area 22 and the second stress concentration area 23; the third layer (P3), laying the first stress concentration area 22 and the second stress concentration area 23 at a laying angle of ±45°; The fourth layer (P4), the first stress concentration area 22 and the second stress concentration area 23 are laid at a laying angle of ±45°; the fifth layer (P5), the common area 21, is laid at a laying angle of 0°/90° The first stress concentration zone 22 and the second stress concentration zone 23; the sixth layer (P6), the second stress concentration zone 23 is laid at a laying angle of 0°/90°; the seventh layer (P7), according to 0°/90 The second stress concentration zone 23 is laid at the laying angle of °; the eighth layer (P8), the ordinary zone 21, the first stress concentration zone 22 and the second stress concentration zone 23 are laid at a laying angle of ±45°; the ninth layer (P9) ), pave the second stress concentration area 23 at a laying angle of 0°/90°; the tenth layer (P10), pave the second stress concentration area 23 at a laying angle of 0°/90°; the eleventh layer (P11) , Lay the common area 21, the first stress concentration area 22 and the second stress concentration area 23 at a laying angle of 0°/90°; the twelfth layer (P12), pave the first stress concentration area at a laying angle of ±45° 22 and the second stress concentration zone 23; the thirteenth layer (P13), laying the first stress concentration zone 22 and the second stress concentration zone 23 at a laying angle of ±45°; the fourteenth layer (P14), press ±45 ° Laying angle of ordinary area 21, the first stress concentration area 22 and the second stress concentration area 23; the fifteenth layer (P15), laying the ordinary area 21 and the first stress concentration area at a laying angle of 0°/90° 22 and the second stress concentration zone 23. The paving material of the first layer (P1) and the fifteenth layer (P15) is carbon fiber fabric prepreg, and the paving material of the remaining layers is biaxial warp knitted fabric prepreg.

A design method of a carbon fiber composite seat back frame includes the following steps:

(100) Structural design: According to the assembly environment and appearance structure requirements of the carbon fiber composite seat back frame, design the appearance surface and each installation surface of the skeleton body, as shown in Figure 3, including sequential design input, scheme design, calculation and Test and verify whether the design requirements are met; if not, return to the program design steps; if they are met, the design is completed; the input parameters of the design input include technical requirements, use requirements and shape references; the program design includes structural plans, Structural material selection, manufacturing process, weight distribution, three-dimensional modeling, production drawings, technical documents, strength analysis, process review, research and development tests and perfect design, etc.; structural material selection includes the selection of ply materials, which must be selected for current stable production and meet product thickness Carbon fiber fabric prepregs and biaxial warp knitted fabric prepregs required, with complete material performance parameters and lower cost; and define the laying thickness of three layers of different thicknesses, the general thickness is 2.4mm (common area) ), the local thickness is reinforced and thickened by 5.6mm (the second stress concentration zone) and 4.0mm (the first stress concentration zone) according to the possible stress concentration area, and the thickness is used as the iterative calculation input of the strength design;

(200) Laying design: Define the layup sequence according to the carbon fiber layup design rules and different thickness areas; as shown in Figure 4, complete the layup design according to the layup design process;

(300) Strength calculation: refer to the designed model and pavement-use ABAQUS for simulation design-finite element calculation-analysis results; the finite element calculation includes the establishment of a mesh model, the definition of material and section properties, boundary conditions and loads; The analysis result is to analyze the deformation of the carbon fiber seat back frame under different working conditions, and iteratively calculate the optimal strength and stiffness results. Specifically:

(1) Working condition requirements

According to the car seat test requirements and related specifications, the test is carried out by applying two moments as shown in Figure 5, recording the test results, recording the force-displacement curve of the loading process, recording the skeleton deformation angle after the test is completed, and recording the corresponding results.

(2) Simulation analysis

1. Define the material: According to the ASTM test specification, the tensile, compression, bending, and shear performance data of the material are measured, and the material card is input.

2. Establish a mesh model and boundary conditions.

Adjust the geometry of the metal parts so that the metal parts and the composite parts are parallel to the bolt installation end surface, and the spacing is consistent with the digital model model. Set up RBE2 elements at the bolt hole positions of metal parts and composite parts respectively, and set up CBUSH elements between two independent points of RBE2 elements. The element stiffness is defined as (4.61e6, 2.83e7, 2.83e7, 2.21e7, 2.88e7, 2.88e7). ①The RBE2 element is established by rotating the axis hole edge node and the hole center, and constrains all 6 degrees of freedom of the hole center. ②In the local coordinate system, the loading point coordinates are (0,0,500), the loading point is an independent point, and the back flanging node of the same level is a non-independent point, the RBE2 unit is established, and the loading direction is the X direction.

(3) Analysis results

1. After calculation, the results are as follows:

2. Checking the extrusion strength of carbon fiber composite material bolt holes:

The compressive strength of carbon fiber composite material is 363MPa, and the allowable value of pore extrusion strength is 363Mpa/1.5=242Mpa. The upper bolt hole extrusion stress=shearing force/extrusion area=shearing force/(bolt diameter*composite thickness)=11587N/(10*5)=231.7MPa<[s]=242MPa. The extrusion stress of the lower bolt hole=shearing force/extrusion area=shearing force/(bolt diameter*composite thickness)=9894N/(10*5)=197.9MPa<[s]=242MPa.

Conclusion: In the last model, the range of the reinforced zone was optimized, which effectively reduced the maximum Tsai-Wu factor, making the structure safer; the design load was set to 120% of the test load, resulting in increased deformation, but still meeting the deformation requirements.

The invention discloses a carbon fiber composite material seat back frame and a design method thereof, which can meet the requirements of lightweight car seat frame, and exert the physical performance of carbon fiber composite material on the seat to a greater extent, and reduce car seat frame parts , To enhance the integrity of the car seat.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or positional relationship based on the drawings. The position or position relationship, or the position or position relationship usually placed when the product of the invention is used, is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position and The specific azimuth structure and operation cannot be understood as a limitation of the present invention. The above descriptions are only preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

The above are only the embodiments of the present invention, which do not limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the description and drawings of the present invention, or directly or indirectly applied to other related technologies In the same way, all fields are included in the scope of patent protection of the present invention.

Claims

A carbon fiber composite seat back frame is characterized by comprising a frame body, the frame body contains a wrapping buckle mounting surface, a metal fitting mounting surface, and an angle adjuster mounting surface; the wrapping buckle mounting surface has two There are two mounting surfaces for the metal parts, which are symmetrically disposed on the skeleton body; there are two mounting surfaces for the angle adjuster, which are symmetrically disposed on the skeleton body; Three paving areas with different thicknesses are laid on the skeleton body.
The carbon fiber composite seat back frame according to claim 1, wherein the paving material of the three plies of different thicknesses is carbon fiber fabric prepreg or biaxial warp knitted fabric prepreg.
The carbon fiber composite seat back frame according to claim 2, wherein the paving material of the bottom layer and the surface layer of the three ply areas of different thicknesses is carbon fiber fabric prepreg, and the three different thicknesses The paving material of the inner layer of the paving area is biaxial warp knitted fabric prepreg.
The carbon fiber composite seat back frame according to claim 1, wherein the laying angles of the three layers of different thicknesses are divided into a combination of 0°/90° layer and ±45° layer.
The carbon fiber composite seat back frame according to claim 4, wherein the laying ratio of the 0°/90° layer to the ±45° layer is 57% and 43%.
The carbon fiber composite seat back frame according to claim 1, wherein the three layers of different thicknesses are divided into a normal area, a first stress concentration area, and a second stress concentration area, and the normal area is In the surface area of the skeleton body, the first stress concentration area is the side wing area of the skeleton body, and the second stress concentration area is the two mounting surface areas of the metal parts.
The carbon fiber composite seat back frame according to claim 6, wherein the laying thickness of the common area is 2.4 mm, the laying thickness of the first stress concentration area is 4.0 mm, and the second stress concentration area is 4.0 mm. The laying thickness of the zone is 5.6mm.
A method for designing a carbon fiber composite seat back frame according to any one of claims 1-7, characterized in that it comprises the following steps:

(100) Structural design: Design the appearance and installation surfaces of the skeleton body according to the assembly environment and appearance structure requirements of the carbon fiber composite seat back frame, including sequential design input, scheme design, calculation and testing, and verification of compliance Design requirements steps; if not met, return to the program design steps; if met, complete the design;

(200) Lay-up design: define the ply sequence according to the carbon fiber ply design rules and different thickness areas;

(300) Strength calculation: refer to the designed model and pavement-use ABAQUS for simulation design-finite element calculation-analysis results.
The method for designing a carbon fiber composite seat back frame according to claim 8, wherein the finite element calculation includes establishing a mesh model, defining material and section properties, boundary conditions, and loads.
The method for designing a carbon fiber composite seat back frame according to claim 8, wherein the analysis result is to analyze the strength and rigidity of the carbon fiber seat back frame under different working conditions, and iteratively calculate the optimal strength and Stiffness result.