Automobile seat cross beam reinforcing framework and manufacturing method

Abstract

This application relates to the field of automotive parts manufacturing, and in particular to a reinforcing frame for an automotive seat crossbeam and its manufacturing method. It includes a frame beam structure disposed between the vehicle chassis and the seat crossbeam. This structure is a hollow beam with open cavities at both ends, and has covering grooves on both sides of the upper and lower end faces, with SNS foam filling the grooves. The frame beam structure has first and second electrophoresis tanks and corresponding electrophoresis fluid holes, and internal reinforcing beams. The frame beam structure is formed by closed-mold pultrusion of a continuous fiber-reinforced composite material containing polyurethane resin and fiber reinforcement. The application also includes a manufacturing method for this reinforcing frame, involving steps such as fiber material arrangement, resin injection, and pultrusion curing. This application achieves the effects of reducing seat weight, improving seat comfort and torsional resistance, improving electrophoresis quality, reducing noise and vibration, and enabling automated production, improving production efficiency and product quality stability.

Description

Technical Field

[0001] This application relates to the field of automotive parts manufacturing, and in particular to a reinforcing frame for an automotive seat crossbeam and its manufacturing method. Background Technology

[0002] Products like reinforced crossbeam frames for automotive seats have important applications in automotive manufacturing, drone manufacturing, and aerospace, playing a crucial role in lightweighting automobiles, aircraft, and spacecraft and improving ride comfort. In the automotive field, it connects the car chassis and seat crossbeams into a unified whole, enhancing the performance of both the chassis and seats.

[0003] In related technologies, automotive reinforcement components are primarily manufactured using a two-stage injection molding process. Specifically, a nylon skeleton is first injection molded, followed by a second injection molding process to coat the nylon skeleton with a rubber compound. This method is a common practice in automotive reinforcement component manufacturing and has been widely used in automotive manufacturing and related fields for a long time. In addition, steel or aluminum alloys are also commonly used as automotive reinforcement components.

[0004] However, secondary injection molding has many drawbacks. It suffers from slow production speed and low efficiency, and the high cost of equipment leads to persistently high production costs. The products produced have poor mechanical properties, are unsuitable for molding long, narrow components, and are prone to delamination between the coating and the frame. Using steel or aluminum alloys may not adequately meet the lightweighting requirements of automobiles, making it difficult to maintain good performance while reducing weight. Summary of the Invention

[0005] To address the problems of low production efficiency, high cost, and insufficient lightweighting in existing automotive seat crossbeam reinforcement frames, this application provides an automotive seat crossbeam reinforcement frame and its manufacturing method.

[0006] In a first aspect, this application provides a reinforcing frame for an automotive seat crossbeam, employing the following technical solution:

[0007] A reinforcing frame for an automotive seat crossbeam includes a frame beam structure. The frame beam structure includes a hollow beam-shaped structure with an inner cavity open at both ends. The hollow beam-shaped structure has an upper end face and a lower end face. Covering grooves extending along the length direction of the hollow beam-shaped structure are provided on both sides of the upper end face and the lower end face. SNS expanding foam is disposed in the covering grooves and fixedly connected to the covering grooves. The cross-sectional shape of the SNS expanding foam matches the cross-sectional shape of the covering grooves.

[0008] By adopting the above technical solution, the reinforcing frame of the car seat crossbeam is located between the car chassis and the car seat sheet metal, connecting the car chassis and the seat crossbeam into a whole. This strengthens both the car chassis and the car seat sheet metal, while also providing shock absorption, sound insulation, and improved ride comfort. The hollow beam structure and the covering grooves on both sides of the frame beam facilitate the placement and fixation of SNS expanding foam. The SNS expanding foam, placed within the covering grooves and with a cross-sectional shape that matches them, foams under the electrophoretic heating effect of the car chassis, filling the gap between the sheet metal and the chassis. Furthermore, the SNS material does not contain organic solvents such as toluene and xylene, will not affect the electrolyte, and can resist the action of the electrophoretic solution.

[0009] Optionally, a first electrophoretic liquid tank extending along the length direction of the skeleton beam structure is provided at the center of the upper end face, and a second electrophoretic liquid tank extending along the length direction of the skeleton beam structure is provided at the center of the lower end face. The first electrophoretic liquid tank is provided with a plurality of first electrophoretic liquid holes communicating with the inner cavity, and the second electrophoretic liquid tank is provided with a plurality of second electrophoretic liquid holes communicating with the inner cavity.

[0010] By adopting the above technical solution, the electrophoresis tank can avoid some space of the vehicle chassis and seat sheet metal, reducing the impact of the car seat crossbeam reinforcement frame on electrophoresis. The electrophoresis tank is equipped with electrophoresis liquid holes that communicate with the inner cavity, ensuring that the electrophoresis liquid smoothly leaves the inner cavity of the frame beam structure, preventing electrophoresis liquid retention and avoiding adverse effects on the frame beam structure caused by electrophoresis liquid retention.

[0011] Optionally, the skeleton beam structure further includes a reinforcing beam structure, which is located vertically at the center of the inner cavity and extends along the length of the hollow beam structure.

[0012] By adopting the above technical solution, the reinforcing beam structure is set vertically at the center of the inner cavity and extends along the length of the hollow beam structure. This can enhance the overall structural strength and stability of the car seat crossbeam reinforcement frame, improve the frame's ability to withstand external forces in all directions, and enable the frame to better connect the car chassis and the seat crossbeam into a whole. This further improves the mechanical properties of the car chassis and car seat sheet metal, thereby enhancing the comfort of the driver and passengers.

[0013] Optionally, the skeleton beam structure is formed by closed-mold pultrusion of continuous fiber reinforced composite material, the continuous fiber reinforced composite material including polyurethane resin and fiber reinforcement impregnated by the polyurethane resin, the fiber reinforcement including glass fiber yarn arranged along the length direction of the skeleton beam structure and composite felt laid on the inner and outer surfaces of the formed glass fiber yarn.

[0014] By adopting the above technical solution, a skeleton beam structure is manufactured using continuous fiber-reinforced composite materials through closed-mold pultrusion molding. The selected polyurethane resin and the fiber reinforcement impregnated with it comprise glass fiber yarns arranged along the length direction and composite mats laid on the inner and outer surfaces of the glass fiber yarns. This combination of materials and processes effectively improves the mechanical properties of the skeleton beam structure in all directions. For example, high-strength glass fiber yarns improve the mechanical properties of the skeleton in the 0° direction, high-strength composite mats improve the mechanical properties of the skeleton in the 90° direction, and high-performance polyurethane enhances the shear properties of the skeleton. Simultaneously, controlling the content of each component achieves a balance of mechanical properties in all directions of the skeleton. Furthermore, this method results in products with excellent performance, significant weight reduction, excellent sound absorption and noise reduction effects, high production efficiency, low equipment cost, suitability for molding long and large components, low production cost, and strong coating. It overcomes the disadvantages of traditional secondary injection molding, such as slow production speed, low production efficiency, high equipment cost, poor mechanical properties, unsuitability for molding long and large components, high production cost, and easy peeling.

[0015] Optionally, the strength of the glass fiber yarn is not less than 2600MPa, and the composite felt is an ECT glass fiber yarn composite felt with a strength of 600g / m².

[0016] By adopting the above technical solution and selecting glass fiber yarn with a strength of not less than 2600MPa and ECT glass fiber yarn composite felt with a strength of 600g / m², the mechanical properties of the skeleton beam structure in the 0° and 90° directions can be effectively improved, and the shear performance of the skeleton can also be enhanced, so as to achieve a balance of mechanical properties in all directions of the skeleton, making the overall performance of the automotive seat crossbeam reinforcement skeleton better and better meeting the needs of automotive seat crossbeam reinforcement.

[0017] Secondly, this application provides a method for manufacturing a reinforcing frame for an automotive seat crossbeam, employing the following technical solution:

[0018] A method for manufacturing a reinforcing frame for an automotive seat crossbeam, used to manufacture the automotive seat crossbeam reinforcing frame as described above, includes the following steps:

[0019] S1: Provides fiberglass yarn and composite mat. The fiberglass yarn is arranged in a hollow beam cross-sectional structure and a covered groove cross-sectional structure. The composite mat is symmetrically laid on the inner and outer surfaces of the hollow beam structure formed by the fiberglass yarn in two layers on each side.

[0020] S2: The arranged glass fiber yarn and composite felt are introduced into a closed injection molding mold;

[0021] S3: Polyurethane resin is injected into the mold cavity of the molding mold through a metering pump, so that the resin fully impregnates the glass fiber yarn and composite felt under pressure.

[0022] S4: In the molding die, the impregnated fiber reinforcement undergoes a pultrusion curing reaction under heating and pressure, and is molded into a skeleton beam structure in one step;

[0023] S5: Traction and cooling of the cured skeleton beam structure, drilling the first and second electrophoretic liquid holes and cutting them to the predetermined length;

[0024] S6: Connect multiple equal-length skeleton beam structures end to end with joint connecting blocks, and apply adhesive to the covering groove of the skeleton beam structure.

[0025] S7: The molten SNS foam is continuously coated into the coating tank through an extruder;

[0026] S8: Cool and shape the skeleton beam structure covered with SNS foam.

[0027] By adopting the above technical solution, this manufacturing method ensures excellent performance of the automotive seat crossbeam reinforcement frame. Symmetrically laying the composite felt in two layers on each side prevents excessive fragmentation, reduces mold blockage, avoids mold blockage caused by misalignment during composite felt molding, and improves production efficiency. Injecting polyurethane resin using a metering pump allows the resin to fully impregnate the fiber reinforcement, and combined with a pultrusion curing reaction under heat and pressure, the frame beam structure can be formed in one step, ensuring that the mechanical properties of the frame in the 0° / 90° direction meet design requirements. The cured frame beam structure undergoes traction, cooling, drilling, and cutting operations to ensure the frame's dimensions and functionality. Multiple frame beam structures of equal length are joined together using joint connecting blocks, satisfying both profile traction and push-pull requirements while ensuring the straightness and continuity of the covered frame. Applying adhesive to the covering groove followed by covering with molten SNS foam ensures a strong bond to the frame. Finally, cooling and shaping the frame covered with SNS foam effectively improves the SNS foam covering efficiency. The overall approach replaces traditional two-shot injection molding with simple pultrusion overmolding, and replaces traditional two-shot injection molds with simple pultrusion molds and overmolding molds. The mold structure is simpler, and the mold cost is reduced by 60%. Extrusion overmolding replaces traditional extrusion injection molding, which increases production efficiency by nearly 5 times and reduces production costs by 30%.

[0028] Optionally, in step S3, the resin content of the glass fiber yarn is controlled at 15%±1%, and the resin content of the composite felt is controlled at 25%±1%.

[0029] By adopting the above technical solution, the resin content of glass fiber yarn is controlled at 15%±1%, and the resin content of composite felt is controlled at 25%±1%. This ensures that the mechanical properties of the skeleton in the 0° / 90° direction meet the design requirements, improves the overall mechanical properties of the skeleton, and ensures that the performance indicators of the skeleton meet the design standards.

[0030] Optionally, in step S4, the molding pressure inside the mold cavity of the molding die is not less than 75 MPa.

[0031] By adopting the above technical solution, a molding pressure of not less than 75MPa is set in the mold cavity of the molding mold, which can ensure that the mechanical properties of the skeleton in the 0° / 90° direction meet the design requirements, so that the reinforcing skeleton of the car seat crossbeam has excellent mechanical properties, meets the requirements of the reinforcing skeleton of the car seat crossbeam for strength and stability, and ensures product quality and performance.

[0032] Optionally, step S1 further includes providing bulked yarn, which is arranged between the hollow beam structure formed by the glass fiber yarn laid with composite felt and the covering groove structure formed by the glass fiber yarn; in step S4, the connection area between the hollow beam structure and the covering groove is formed by the bulked yarn to form a transition adhesive layer.

[0033] By adopting the above technical solution, in the manufacturing of the reinforcing frame of the car seat crossbeam, in step S1, bulked yarn is provided and arranged between the hollow beam structure formed by the glass fiber yarn laid with composite felt and the covering groove structure formed by the glass fiber yarn. In step S4, the connection area between the hollow beam structure and the covering groove can form a transition adhesive layer through the bulked yarn, which can ensure the stability of the frame covering groove structure and avoid the covering edge from peeling or falling off from the main frame during molding.

[0034] Optionally, in step S8, the SNS foam coating is cooled and shaped using air cooling.

[0035] By adopting the above technical solution, the SNS foam adhesive is cooled and shaped by air cooling in step S8, which enables the SNS covered in the skeleton covering groove to cool down quickly and effectively improves the covering efficiency of SNS adhesive.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. By using high-strength glass fiber, high-strength composite felt, high-performance polyurethane, and reasonable component content, the mechanical properties of the skeleton in all directions are balanced, overcoming the problem of poor mechanical properties of traditional materials;

[0038] 2. A wrapping groove is set on the pre-contact surface of the frame, seat sheet metal and chassis, and filled with SNS adhesive to connect the seat sheet metal and the chassis into a whole, thereby improving the mechanical properties of the seat sheet metal and the chassis and reducing the overall weight;

[0039] 3. Using pultrusion overmolding instead of traditional injection molding, simpler molds are used, reducing mold costs by 60%, increasing production efficiency by nearly 5 times, and reducing production costs by 30%, thus solving the problems of low production efficiency and high cost of traditional processes. Attached Figure Description

[0040] Figure 1 This is a three-dimensional structural diagram of the automotive seat crossbeam reinforcement frame provided in the embodiments of this application.

[0041] Figure 2 This is a cross-sectional view of the automotive seat crossbeam reinforcement frame provided in the embodiments of this application.

[0042] Explanation of reference numerals in the attached drawings: 1-Hollow beam structure; 2-Covering tank; 3-SNS foam adhesive; 4-First electrophoresis tank; 5-Second electrophoresis tank; 6-First electrophoresis hole; 7-Second electrophoresis hole; 8-Reinforcing beam structure. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0044] This application discloses a reinforcing frame for a car seat crossbeam.

[0045] The automotive seat crossbeam reinforcement frame includes a frame beam structure and SNS expanding foam 3. The SNS expanding foam 3 is located within and fixedly connected to the covering groove 2 of the frame beam structure, effectively connecting the vehicle chassis and seat crossbeam into a unified whole. This enhances the performance of both the chassis and the seat, while also providing shock absorption, sound insulation, and improved ride comfort. During the installation of the automotive seat crossbeam reinforcement frame, the SNS expanding foam 3 expands under the electrophoretic heating effect of the vehicle chassis, filling the gap between the sheet metal and the chassis, thus achieving both connection and reinforcement.

[0046] like Figure 1 and Figure 2 As shown, the skeleton beam structure includes a hollow beam-like structure 1 with an inner cavity open at both ends. The hollow beam-like structure 1 has an upper end face and a lower end face. The hollow beam-like structure 1 can be shaped like a rectangular tube, and its material can be a continuous fiber reinforced composite material. This structural design allows the skeleton beam structure to reduce its weight while ensuring strength, which is in line with the trend of lightweighting in automobiles. Covering grooves 2 extending along the length of the hollow beam-like structure 1 are provided on both sides of the upper and lower end faces. The covering grooves 2 are used to accommodate SNS foam 3. The shape of the covering grooves 2 can be U-shaped, which facilitates the filling and fixing of the SNS foam 3.

[0047] The cross-sectional shape of SNS foam 3 matches the cross-sectional shape of the covering groove 2. SNS foam 3 is a foaming material that does not contain organic solvents such as toluene and xylene and will not affect the electrolyte. After heating and foaming, it can tightly fill the covering groove 2 and bond tightly to the car chassis and seat sheet metal.

[0048] like Figure 1 and Figure 2As shown, to reduce the impact on the electrophoresis process, a first electrophoretic liquid tank 4 extending along the length of the skeleton beam structure is provided at the center of the upper end face, and a second electrophoretic liquid tank 5 extending along the length of the skeleton beam structure is provided at the center of the lower end face. The function of the electrophoretic liquid tanks is to ensure that the electrophoretic liquid can better contact the surfaces of the car chassis and seat crossbeams during the automotive electrophoretic coating process, thereby improving the coating effect. The first electrophoretic liquid tank 4 has several first electrophoretic liquid holes 6 communicating with the inner cavity, and the second electrophoretic liquid tank 5 has several second electrophoretic liquid holes 7 communicating with the inner cavity. The first electrophoretic liquid holes 6 and the second electrophoretic liquid holes 7 can be small circular or square holes, their function being to guide the electrophoretic liquid away from the inner cavity and prevent the electrophoretic liquid from remaining in the skeleton.

[0049] like Figure 1 and Figure 2 As shown, the skeleton beam structure also includes a reinforcing beam structure 8, which is located vertically at the center of the inner cavity and extends along the length of the hollow beam structure 1. The reinforcing beam structure 8 can be a rectangular plate structure, which can enhance the overall strength and stability of the skeleton beam structure and improve its resistance to external forces.

[0050] The skeleton beam structure is formed by closed-mold pultrusion of continuous fiber-reinforced composite material, which includes polyurethane resin and fiber reinforcement impregnated with polyurethane resin. Polyurethane resin possesses excellent mechanical and processing properties, enabling it to firmly bond the fiber reinforcement together to form a unified structure. The fiber reinforcement includes glass fiber yarns arranged along the length of the skeleton beam structure and composite mats laid on the inner and outer surfaces of the formed glass fiber yarns. Using glass fiber yarns with a strength of not less than 2600 MPa improves the mechanical properties of the skeleton in the 0° direction, while using 600 g / m² ECT glass fiber yarn composite mats improves the mechanical properties of the skeleton in the 90° direction. Polyurethane improves the shear properties of the skeleton. Controlling the content of each component ensures balanced mechanical properties in all directions of the skeleton. The parameters are shown in Table 1.

[0051] Table 1 Mechanical property parameters

[0052] Serial Number Parameter name unit numerical values 1 0° Tensile strength MPa 1200.0 2 0° tensile modulus GPa 50.0 3 0° elongation at break % 2.8 4 90° tensile strength MPa 560.0 5 90° tensile modulus GPa 38.0 6 90° elongation at break % 3.2 7 Surface shear strength MPa 95.0 8 Interlaminar shear strength MPa 75.0

[0053] This application also discloses a method for manufacturing a reinforcing frame for an automobile seat crossbeam.

[0054] The manufacturing method of the automotive seat crossbeam reinforcement frame includes the following steps:

[0055] S1: Provides fiberglass yarn, composite mat, and bulky yarn. The fiberglass yarn is arranged according to the cross-sectional structure of the hollow beam structure 1 and the cross-sectional structure of the covering groove 2. The composite mat is symmetrically laid in two layers on each of the inner and outer surfaces of the hollow beam structure 1 formed by the fiberglass yarn. The bulky yarn is arranged between the hollow beam structure 1 formed by the fiberglass yarn and the covering groove 2 formed by the composite mat. The arrangement of the fiberglass yarn needs to be precisely in accordance with the shape of the hollow beam structure 1 and the covering groove 2 to ensure that the final formed skeleton beam structure meets the design requirements. The two-layer laying method of the composite mat on each of the inner and outer surfaces can prevent the composite mat from becoming too fragmented during the molding process and reduce the occurrence of mold blockage.

[0056] S2: The arranged glass fiber yarn, composite felt, and bulked yarn are fed into a closed injection molding die. The injection molding die needs to have precise dimensions and shape to ensure the molding accuracy of the skeleton beam structure.

[0057] S3: Polyurethane resin is injected into the mold cavity of the molding die using a metering pump. Under pressure, the resin fully impregnates the glass fiber yarn and composite felt. The resin content of the glass fiber yarn is controlled at 15% ± 1%, and the resin content of the composite felt is controlled at 25% ± 1%. The metering pump precisely controls the injection volume of polyurethane resin, ensuring uniform impregnation of the fiber reinforcement. This resin content control guarantees the mechanical and processing properties of the skeleton beam structure.

[0058] S4: In the molding die, the impregnated fiber reinforcement undergoes a pultrusion curing reaction under heat and pressure, forming a skeleton beam structure in one step. The molding pressure inside the mold cavity is not less than 75 MPa. During this process, the heating and pressure cause the polyurethane resin to cure, bonding the fiber reinforcement together to form a whole. At the same time, the connection area between the hollow beam structure 1 and the coating groove 2 is formed by a transition adhesive layer through bulked yarn, ensuring the structural stability of the skeleton coating groove 2.

[0059] S5: The cured skeleton beam structure is stretched and cooled, the first electrophoretic fluid hole 6 and the second electrophoretic fluid hole 7 are drilled, and it is cut to the predetermined length. The speed and temperature of the stretching and cooling process need to be carefully controlled to ensure the quality of the skeleton beam structure. The predetermined length can be adjusted according to the actual needs of the car seat.

[0060] S6: Multiple equal-length skeleton beams are joined together end-to-end using connector blocks. Adhesive is applied to the covering groove 2 of the skeleton beam structure. The connector block consists of two parts, the outlines of which respectively mate with the two parts divided by the reinforcing beam structure 8 within the inner cavity. Its function is to connect the beginning and end of two skeleton beam structures together, forming a continuous long strip component for the covering operation. The application of adhesive can improve the bonding strength between the SNS foam 3 and the skeleton beam structure.

[0061] S7: Molten SNS foam 3 is continuously coated into the coating tank 2 via an extruder. To prevent screw sticking, a semi-permanent release agent is applied to the screw surface to ensure discontinuous extrusion without screw disassembly, thereby improving production efficiency and reducing labor consumption. The extruder needs to be able to stably extrude molten SNS foam 3 and ensure uniform and continuous coating.

[0062] S8: The skeleton coated with SNS expanding foam 3 is cooled and shaped using air cooling. Air cooling allows the SNS expanding foam 3 to cool rapidly, effectively improving the coating efficiency of the SNS adhesive.

[0063] The implementation principle of this application embodiment is as follows: By adopting a unique skeleton beam structure design, including a hollow beam structure 1, a reinforcing beam structure 8, and the setting of an electrophoresis tank and electrophoresis holes, the overall performance and coating effect of the skeleton beam structure are improved. Simultaneously, by selecting a reasonable continuous fiber reinforced composite material and through precise material proportioning and molding processes, the mechanical properties of the skeleton beam structure in all directions are more balanced, meeting the requirements of lightweight and high performance in automobiles. The use of SNS foam 3 further enhances the connection between the automobile chassis and the seat crossbeam, improving ride comfort. Through process optimization, simple pultrusion overmolding replaces traditional injection molding, and simple pultrusion molds and overmolding molds replace traditional double-injection molds, resulting in a simpler mold structure and a 60% reduction in mold cost. Extrusion overmolding replaces traditional extrusion injection molding, increasing production efficiency by nearly 5 times and reducing production costs by 30%. Compared with traditional automotive reinforcement parts, the automotive seat crossbeam reinforcement skeleton of this embodiment has advantages such as superior performance, significant lightweighting, and excellent sound absorption and noise reduction effects.

[0064] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for manufacturing a reinforcing frame for an automobile seat crossbeam, characterized in that, For manufacturing a reinforcing frame for an automotive seat crossbeam, the automotive seat crossbeam reinforcing frame includes A skeleton beam structure, the skeleton beam structure includes a hollow beam-shaped structure (1) with an inner cavity open at both ends, the hollow beam-shaped structure (1) has an upper end face and a lower end face, and the upper end face and the lower end face are provided with covering grooves (2) extending along the length direction of the hollow beam-shaped structure (1) on both sides. SNS expanding foam (3) is disposed within the covering groove (2) and fixedly connected to the covering groove (2). The cross-sectional shape of the SNS expanding foam (3) matches the cross-sectional shape of the covering groove (2). The skeleton beam structure is formed by closed-mold pultrusion of continuous fiber reinforced composite material. The continuous fiber reinforced composite material includes polyurethane resin and fiber reinforcement impregnated with the polyurethane resin. The fiber reinforcement includes glass fiber yarns arranged along the length direction of the skeleton beam structure and composite mats laid on the inner and outer surfaces of the formed glass fiber yarns. The manufacturing method of the automotive seat crossbeam reinforcing frame includes the following steps: S1: Provide glass fiber yarn and composite felt. The glass fiber yarn is arranged according to the cross-sectional structure of the hollow beam structure (1) and the cross-sectional structure of the covering groove (2). The composite felt is symmetrically laid on the inner and outer surfaces of the hollow beam structure (1) formed by the glass fiber yarn in two layers each. S2: The arranged glass fiber yarn and composite felt are introduced into a closed injection molding mold; S3: Polyurethane resin is injected into the mold cavity of the molding mold through a metering pump, so that the resin fully impregnates the glass fiber yarn and composite felt under pressure. S4: In the mold, the impregnated fiber reinforcement undergoes a pultrusion curing reaction under heating and pressure, and is formed into a skeleton beam structure in one step; S5: The solidified skeleton beam structure is pulled and cooled, and the first electrophoretic liquid hole (6) and the second electrophoretic liquid hole (7) are drilled and cut to a predetermined length; S6: Connect multiple equal-length skeleton beam structures end to end with joint connecting blocks and apply adhesive to the covering groove (2) of the skeleton beam structure. S7: The molten SNS foam (3) is continuously coated into the coating tank (2) by an extruder; S8: Cool and shape the skeleton beam structure covered with SNS foam (3).

2. The method for manufacturing the automotive seat crossbeam reinforcing frame according to claim 1, characterized in that, The upper end face is provided with a first electrophoretic liquid tank (4) extending along the length direction of the skeleton beam structure at the center, and the lower end face is provided with a second electrophoretic liquid tank (5) extending along the length direction of the skeleton beam structure at the center. The first electrophoretic liquid tank (4) is provided with a plurality of first electrophoretic liquid holes (6) communicating with the inner cavity, and the second electrophoretic liquid tank (5) is provided with a plurality of second electrophoretic liquid holes (7) communicating with the inner cavity.

3. The method for manufacturing the automotive seat crossbeam reinforcing frame according to claim 2, characterized in that, The skeleton beam structure also includes a reinforcing beam structure (8), which is located vertically at the center of the inner cavity and extends along the length of the hollow beam structure (1).

4. The method for manufacturing the automotive seat crossbeam reinforcing frame according to claim 3, characterized in that, The strength of the glass fiber yarn is not less than 2600MPa, and the composite felt is an ECT glass fiber yarn composite felt with a strength of 600g / m2.

5. The method for manufacturing the automotive seat crossbeam reinforcing frame according to claim 1, characterized in that: In step S3, the resin content of the glass fiber yarn is controlled at 15%±1%, and the resin content of the composite felt is controlled at 25%±1%.

6. The method for manufacturing the automotive seat crossbeam reinforcing frame according to claim 5, characterized in that: In step S4, the molding pressure inside the mold cavity of the molding die is not less than 75MPa.

7. The method for manufacturing the automotive seat crossbeam reinforcing frame according to claim 6, characterized in that: In step S1, the method further includes providing bulked yarn, which is arranged between the hollow beam structure (1) formed by the glass fiber yarn laid with composite felt and the covering groove (2) structure formed by the glass fiber yarn; in step S4, the connection area between the hollow beam structure (1) and the covering groove (2) forms a transition adhesive layer through the bulked yarn.

8. The method for manufacturing the automotive seat crossbeam reinforcing frame according to claim 7, characterized in that: In step S8, the SNS foam (3) is cooled and shaped by air cooling.

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