A front wall, a method of manufacturing a front wall, and a vehicle

Abstract

The application belongs to the technical field of vehicle body parts, and relates to a front wall, a front wall manufacturing method and a vehicle. The front wall comprises an upper plate, a lower plate, a reinforcing cross beam and a patch plate. The reinforcing cross beam is connected between the upper plate and the lower plate. The patch plate is attached to the connection between the upper plate and the reinforcing cross beam and / or the connection between the lower plate and the reinforcing cross beam. The upper plate, the lower plate, the reinforcing cross beam and the patch plate are hot-stamping formed into an integrated structure. The application can improve the overall stress distribution when the front wall is loaded, improve the safety of the vehicle during a collision, and obtain an integrated structure through hot-stamping forming without additional connection or sealing. The integrated structure can further meet the lightweighting requirements of the vehicle, improve the load distribution through the overall load bearing mode of the integrated structure, reduce stress concentration, further improve the overall strength, and be conducive to meeting the lightweighting and safety requirements.

Description

Technical Field

[0001] This invention relates to the field of vehicle body component technology, specifically to a front bulkhead, a front bulkhead manufacturing method, and a vehicle. Background Technology

[0002] The front bulkhead is a partition installed between the engine compartment and the passenger compartment to prevent exhaust fumes, high temperatures, and noise from the engine compartment from entering the passenger compartment. In the event of an accident, the front bulkhead also serves as a protective structure for the front of the passenger compartment. Given the current trend of lightweight vehicle bodies, the safety of the front bulkhead is equally important.

[0003] In the prior art, in order to control the weight of the front bulkhead, the structure of the front bulkhead is generally a single-layer stamped steel plate or spliced ​​steel plate. However, in order to ensure the structural strength of the front bulkhead, it is often necessary to optimize the structure of the front bulkhead. For example, additional reinforcing structures or energy-absorbing structures such as reinforcing frames or energy-absorbing boxes can be connected to the body of the front bulkhead. Alternatively, the number or strength of the connecting parts between the various parts of the front bulkhead can be improved. For example, Chinese Patent Publication No. CN218806153U discloses a front bulkhead structure including a first front bulkhead assembly and a second front bulkhead assembly. The first front bulkhead assembly and the second front bulkhead assembly are connected by connecting parts, including bolts for X-direction connection and structural adhesive for Z-direction connection. Furthermore, the second front bulkhead assembly also includes a first torque box and a second torque box. As another example, Chinese Patent Publication No. CN115214795A discloses a front bulkhead assembly that improves strength by forming force transmission cavities at the connection points of different areas of the front bulkhead.

[0004] The shortcomings of existing front bulkheads are that they are difficult to balance the requirements of lightweighting and safety, which are reflected in at least the following aspects: First, in order to meet the strength requirements, it is often necessary to set up an additional independent reinforcing structure or energy-absorbing structure, which leads to a significant increase in weight and cost, which is extremely inconsistent with the design concept of lightweighting. Second, the front bulkheads of the spliced ​​structure are connected by connectors, which have poor connection strength. When subjected to impact, stress concentration is easily generated at the connection point, resulting in the front bulkhead cracking and poor energy absorption effect. Summary of the Invention

[0005] The purpose of this invention is to provide a front bulkhead, a method for manufacturing the front bulkhead, and a vehicle, so as to solve the problem that the front bulkhead in the prior art is difficult to balance the requirements of lightweighting and safety.

[0006] To achieve the above and related objectives, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, this application provides a front bulkhead for installation at the front of a vehicle compartment, characterized in that it comprises: an upper plate, a lower plate, a reinforcing beam, and a patch plate, wherein the reinforcing beam is connected between the upper plate and the lower plate, and the patch plate is attached to the connection between the upper plate and the reinforcing beam, and / or the connection between the lower plate and the reinforcing beam;

[0008] The upper plate, the lower plate, the reinforcing beam, and the patch plate are hot-stamped into a single structure.

[0009] Furthermore, the reinforcing beam includes a middle beam, a left beam, and a right beam. The left beam and the right beam are respectively connected to the left and right sides of the middle beam, and the left beam and the right beam are bent toward the side where the front panel connects to the carriage, so that the reinforcing beam has a U-shaped structure.

[0010] Furthermore, the patch panel includes a first patch panel and a second patch panel. The first patch panel is attached to the side of the front bulkhead that connects to the carriage and is located at the connection between the upper panel and the middle crossbeam. The second patch panel is attached to the side of the front bulkhead that connects to the carriage and is located at the connection between the lower panel and the middle crossbeam.

[0011] Furthermore, the lower plate is provided with longitudinally distributed central channel reinforcing ribs, which form a T-shaped structure with the central crossbeam. The central channel reinforcing ribs protrude toward the side where the front bulkhead connects to the carriage, and the second patch plate is at least partially attached to the central channel reinforcing ribs.

[0012] Furthermore, the thickness of the left crossbeam and the right crossbeam is greater than or equal to the thickness of the middle crossbeam.

[0013] Furthermore, the thickness of the middle crossbeam is 0.8mm-1.2mm, and the thickness of the left crossbeam and the right crossbeam is 1.4mm-2mm.

[0014] Furthermore, the thickness of the upper plate is 0.8mm-1.2mm, the thickness of the lower plate is 0.8mm-1.4mm, the thickness of the reinforcing beam is 1.2mm-2mm, and the thickness of the patch plate is 1.2mm-1.8mm.

[0015] Furthermore, the tensile strength of the reinforcing beam is greater than the tensile strength of the upper plate and the lower plate.

[0016] Furthermore, the tensile strength of the upper plate and the lower plate is 500MPa-800MPa, and the tensile strength of the reinforcing beam is 1300MPa-1650MPa.

[0017] As described above, the front bulkhead is connected in sequence by an upper plate, a reinforcing crossbeam, and a lower plate. The patch plate is kept in close contact with the connection. While meeting the requirements for vehicle body lightweighting, it can improve the overall stress distribution of the front bulkhead when it is under load, thereby improving the safety of the vehicle during a collision.

[0018] Furthermore, the front bulkhead, which is formed by hot stamping of the upper plate, lower plate, reinforcing crossbeam and patch plate, does not require additional connection or sealing. This not only further meets the requirements of vehicle lightweighting, but also improves load distribution and reduces stress concentration through the overall load-bearing method of the integrated structure, thereby further improving the overall strength. This is beneficial for balancing lightweighting and safety requirements.

[0019] Secondly, this application provides a method for manufacturing a front bulkhead, which includes the following steps:

[0020] Provide blanks, and uniformly cut the blanks. The blanks include upper plate blanks, lower plate blanks, reinforcing crossbeam blanks, and patch plate blanks.

[0021] The blanks that have been cut are then welded to obtain a welded plate with an integral plate structure.

[0022] The welding plate is heated until it is fully austenitized to obtain an austenitized plate.

[0023] The austenitic material sheet is subjected to hot stamping forming process to obtain a hot stamping formed material sheet;

[0024] Cool the hot-stamped sheet until it is fully martensitized to obtain a martensitized sheet.

[0025] The edge material of the martensitic sheet is cut to obtain the front panel.

[0026] Furthermore, the step of providing the blank and uniformly blanking the blank includes:

[0027] Based on the positional relationship of the upper plate, the reinforcing beam, and the lower plate in the front bulkhead, the upper plate blank, the reinforcing beam blank, and the lower plate blank are correspondingly cut into the same plane and assembled together;

[0028] The patch plate blank is dropped to the joint position of the upper plate blank and the reinforcing beam blank, and / or the joint position of the reinforcing plate blank and the lower plate blank.

[0029] Further, the step of welding the blank after it has been blanked to obtain a welded plate with an integral plate structure includes:

[0030] Laser welding is performed on the splicing positions between the upper plate blank, the reinforcing beam blank, and the lower plate blank;

[0031] The edges of the patch plate blank are spot-welded to fix it to other blanks.

[0032] Furthermore, the step of heating the welding plate until it is fully austenitized to obtain an austenitized plate includes: placing the welding plate in a heating furnace for heating at a temperature of 930℃-950℃ for a time of 3min-5min.

[0033] Furthermore, the cooling method for the hot stamping forming plate is quenching with quenching liquid, and the cooling conditions include cooling to 10℃-20℃ with a temperature drop gradient of greater than or equal to 30℃ / s.

[0034] Furthermore, the hot stamping forming process includes placing the austenitic material plate in a hot stamping die for hot stamping forming.

[0035] Furthermore, the step of cooling the hot-stamped sheet to complete martensitization to obtain a martensitized sheet is performed within the hot-stamping die.

[0036] As described above, the front bulkhead manufacturing method involves sequentially connecting the upper plate, reinforcing beam, and lower plate of the front bulkhead, with the patch plate fitting snugly to the connection point. This method not only achieves vehicle weight reduction but also improves the overall stress distribution of the front bulkhead under load, thereby enhancing vehicle safety during collisions.

[0037] Thirdly, this application also provides a vehicle in which a front bulkhead as described above is installed between the engine compartment and the passenger compartment.

[0038] In summary, the present invention has at least the following beneficial effects:

[0039] (1) The upper plate, the reinforcing crossbeam and the lower plate are connected in sequence, and the patch plate is kept in close contact with the connection. While meeting the requirements of lightweight body, it can improve the overall stress distribution when the front bulkhead is under load and improve the safety of the car during a collision.

[0040] (2) The front bulkhead, which is formed by hot stamping of the upper plate, lower plate, reinforcing beam and patch plate, does not require additional connection or sealing. It can not only further meet the requirements of vehicle lightweighting, but also improve the load distribution and reduce stress concentration through the overall load-bearing method of the integrated structure, which is conducive to taking into account both lightweighting and safety requirements. Attached Figure Description

[0041] Figure 1 A schematic diagram of the overall structure of the front panel shown in an exemplary embodiment of this application;

[0042] Figure 2A schematic diagram showing the connection relationship of the various parts of the front bulkhead as an exemplary embodiment of this application;

[0043] Figure 3 A lateral cross-sectional view of the front bulkhead at the location of the first patch plate, as shown in an exemplary embodiment of this application;

[0044] Figure 4 A lateral cross-sectional view of the front bulkhead at the location of the second patch plate, shown as an exemplary embodiment of this application;

[0045] Figure 5 A flowchart illustrating a front panel manufacturing method as an exemplary embodiment of this application;

[0046] Figure 6 A flowchart illustrating a specific embodiment of step S510 of the front panel manufacturing method as an exemplary embodiment of this application;

[0047] Figure 7 A schematic diagram showing the positional distribution of various blanks during blanking in a front panel manufacturing method illustrated in an exemplary embodiment of this application;

[0048] Figure 8 A schematic diagram of a computer system suitable for implementing the front panel manufacturing method in the embodiments of this application is shown.

[0049] Among them, 110-upper plate; 120-lower plate; 121-middle channel reinforcing rib; 130-reinforcing crossbeam; 131-middle crossbeam; 132-left crossbeam; 133-right crossbeam; 141-first patch plate; 142-second patch plate; 710-upper plate blank; 720-lower plate blank; 731-middle crossbeam blank; 732-left crossbeam blank; 733-right crossbeam blank; 741-first patch plate blank; 742-second patch plate blank. Detailed Implementation

[0050] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0051] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0052] It is worth noting that the front bulkhead refers to the partition installed at the front of the passenger compartment of a car. When the front bulkhead is installed on a car, its front side faces and is connected to the engine compartment, and its rear side faces and is connected to the passenger compartment.

[0053] In one embodiment, an exemplary front bulkhead is shown; see [link to relevant documentation]. Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the overall structure of the front bulkhead, illustrating an exemplary embodiment of this application. Figure 2 This is a schematic diagram showing the connection relationship of the various parts of the front bulkhead as an exemplary embodiment of this application. The front bulkhead includes at least an upper plate 110, a lower plate 120, a reinforcing beam 130, and a patch plate.

[0054] The reinforcing beam 130 connects the upper plate 110 and the lower plate 120. It can be understood that the reinforcing beam 130 is a plate beam structure that is laterally set between the upper plate 110 and the lower plate 120. The lower end of the upper plate 110 is connected to the upper end of the reinforcing beam 130, and the upper end of the lower plate 120 is connected to the upper end of the reinforcing beam 130, forming a three-area plate structure. This structure is beneficial for designers to select the plate material for the three areas of the upper plate 110, the lower plate 120 and the reinforcing beam 130 according to the overall vehicle size and related design requirements. Compared with the traditional plate structure that uses plate material of equal thickness for stamping, the front bulkhead in this embodiment can better meet the differentiated design requirements. Thinner plates can be selected in areas with excess stress strength, and the overall stress distribution of the front bulkhead can be improved through differentiated plate material selection.

[0055] The patch plate is attached to the connection between the upper plate 110 and the reinforcing beam 130, and / or the connection between the lower plate 120 and the reinforcing beam 130. Here, "attached" means that the patch plate overlaps with the upper plate 110 and the reinforcing beam 130 at their connection points, or it overlaps with the lower plate 120 and the reinforcing beam 130 at their connection points. The patch plate serves as both an auxiliary connection structure and a reinforcing load-bearing structure, absorbing and transferring part of the load at the attachment point, improving the uniformity of stress transmission in the front bulkhead, improving the stress conditions at the connection points of the upper plate 110 and / or the lower plate 120 and the reinforcing beam 130, reducing stress concentration. Furthermore, the attachment point between the patch plate and the upper plate 110, lower plate 120, or reinforcing beam 130 can serve as a welding location. In this embodiment, please refer to [reference needed]. Figures 1-4 , Figure 3 A lateral cross-sectional view of the front bulkhead at the location of the first patch plate 141, as shown in an exemplary embodiment of this application. Figure 4 The diagram illustrates a lateral cross-sectional view of the front bulkhead at the location of the second patch plate 142, as shown in an exemplary embodiment of this application. Two patch plates are provided: a first patch plate 141 fitted to the connection between the upper plate 110 and the reinforcing beam 130, and a second patch plate 142 fitted to the connection between the lower plate 120 and the reinforcing beam 130. It is understood that the patch plates are used to reinforce the connection between the upper plate 110 and the reinforcing beam 130, and / or the connection between the lower plate 120 and the reinforcing beam 130. Here, "fitted" means that there is no gap between the surface of the patch plate and the surfaces of the upper plate 110, lower plate 120, and reinforcing beam 130. "Applied to the connection" means that the patch plate extends from the upper plate 110 to the reinforcing crossbeam 130, or from the reinforcing crossbeam 130 to the lower plate 120, to cover the connection. The patch plate reinforces the connection mechanism of the upper plate 110, lower plate 120 and reinforcing crossbeam 130, which can avoid local stress concentration at the connection position. In some other embodiments, since the specific size and assembly relationship of the front bulkhead are different in different car models, the longitudinal dimension, transverse dimension and transverse setting position of the patch plate can be selected with emphasis according to the installation position of the front bulkhead and its connection relationship with other car parts. This is not limited here.

[0056] In the above embodiment, the upper plate 110, the reinforcing crossbeam 130 and the lower plate 120 are connected in sequence, and the patch plate is kept in close contact with the connection. The patch plate is lightweight and has a large contact area. While meeting the requirements of vehicle body lightweighting, it can increase the energy transfer path during impact, improve the overall stress distribution when the front bulkhead is under load, and improve the safety of the car during collision.

[0057] Furthermore, the front bulkhead is an integral structure formed by hot stamping of the upper plate 110, lower plate 120, reinforcing beam 130, and patch plate. It is worth noting that hot stamping involves heating the material and then using existing forming processes to induce plastic deformation, thereby obtaining the desired structure. In this application, the front bulkhead is formed using hot stamping. After the patch plate is attached to the other plates, the material flow direction of the patch plate during the hot stamping process is consistent with the material flow direction of the upper plate 110, lower plate 120, and reinforcing beam 130 to which the patch plate is attached. No misalignment occurs during the forming and cooling processes. If we consider a point... Welding methods, such as welding, are used to attach the patch plate to the upper plate 110, lower plate 120, and reinforcing beam 130. The weld points and weld beads are not damaged by the hot stamping process; instead, they guide the material flow direction, promoting consistency between the material flow direction of the patch plate and the attached upper plate 110, lower plate 120, and reinforcing beam 130. This ensures the overall structural quality of the front panel after forming. As can be seen, in this embodiment, the structure of the patch plate and the hot stamping forming method are mutually compatible, and their beneficial effects are mutually reinforcing. Neither improving the reinforcing structure alone nor improving the process alone can achieve the above-mentioned effects.

[0058] As mentioned above, hot stamping not only shapes the structure of steel but also improves its material strength by controlling the process conditions. The integrated front bulkhead obtained through hot stamping eliminates the need for connectors between different areas, requiring no additional connections or seals. Compared to traditional connectors or welding, the integrated front bulkhead is a single piece, which does not increase the overall weight. This not only further meets the vehicle's lightweight requirements but also improves load distribution and reduces stress concentration through the integrated load-bearing structure, thus enhancing overall strength and balancing lightweight and safety requirements.

[0059] In this embodiment, the reinforcing crossbeam 130 has a transverse three-section structure, including a middle crossbeam 131, a left crossbeam 132, and a right crossbeam 133. The middle crossbeam 131 is a straight section located in the middle of the reinforcing crossbeam 130. The left crossbeam 132 and the right crossbeam 133 are respectively connected to the left and right sides of the middle crossbeam 131, and the left crossbeam 132 and the right crossbeam 133 face the side where the front bulkhead connects to the vehicle body, so that the reinforcing crossbeam 130 has a U-shaped structure. It can be understood that since the front bulkhead is installed between the engine compartment and the vehicle body, the side where the front bulkhead connects to the vehicle body is the inner side of the front bulkhead. Taking the whole vehicle as a directional reference, it is the side facing the rear of the vehicle. In the above embodiment, setting the reinforcing crossbeam 130 as a transverse three-section structure can be based on design requirements for the middle crossbeam 131, the left crossbeam 132, and the right crossbeam 133. Different material selections are made for the middle crossbeam 131 and the right crossbeam 133. For example, when a car is subjected to a frontal impact, the load-bearing area of ​​the front bulkhead is greater than that of the front bulkhead in a side impact. Based on this difference, the thicknesses of the middle crossbeam 131, the left crossbeam 132, and the right crossbeam 133 can be set to be different. For example, in this embodiment, the thickness of the left crossbeam 132 and the right crossbeam 133 is greater than or equal to the thickness of the middle crossbeam 131. The lateral dimensions of the left crossbeam 132 and the right crossbeam 133 increase as they move away from the middle crossbeam 131, forming an outwardly expanding structure. This reduces the risk of deformation of the reinforcing crossbeam 130 when the energy of a frontal impact is transmitted to both sides, which is beneficial to improving the stress distribution of the reinforcing crossbeam 130 and further improving the strength of the front bulkhead.

[0060] In this embodiment, the patch plate includes a first patch plate 141 and a second patch plate 142. The first patch plate 141 is attached to the side of the front bulkhead that connects to the carriage and is located at the connection between the upper plate 110 and the middle crossbeam 131. The second patch plate 142 is attached to the side of the front bulkhead that connects to the carriage and is located at the connection between the lower plate 120 and the middle crossbeam 131.

[0061] Furthermore, the lower plate 120 is provided with longitudinally distributed central channel reinforcing ribs 121. The central channel reinforcing ribs 121 and the central crossbeam 131 form a T-shaped structure. The central channel reinforcing ribs 121 protrude towards the side where the front bulkhead connects to the carriage. The second patch plate 142 is at least partially attached to the central channel reinforcing ribs 121 to participate in the formation of the T-shaped structure. This helps to improve the overall strength, stiffness and structural stability of the T-shaped structure. At the same time, it can reduce the rebound deformation of the central channel reinforcing ribs 121 during molding. In the event of a high-speed collision, the T-shaped structure divides the energy into three paths: left, middle and right, which are transmitted along the left crossbeam 132, the right crossbeam 133 and the central channel reinforcing ribs 121, respectively, and then absorbed by the upper plate 110 and the lower plate 120. This allows the front bulkhead to better resist overall deformation and ensure the safety of the occupants.

[0062] It is understood that the terms "left," "middle," "right," "first," and "second" used in the above embodiments and subsequent descriptions are descriptive methods adopted for ease of understanding and distinction, and are not intended to limit the actual assembly position, assembly sequence, structural function, or connection relationship.

[0063] Based on the above embodiments, this embodiment further provides a specific implementation scheme for the thickness of each region of the front bulkhead, in order to take into account the lightweight and safety design requirements of automobiles. The thickness of the upper plate 110 is 0.8mm-1.2mm, the thickness of the lower plate 120 is 0.8mm-1.4mm, the thickness of the reinforcing beam 130 is 1.2mm-2mm, and the thickness of the patch plate is 1.2mm-1.8mm. Among the thickness ranges of each region of the front bulkhead, the minimum and maximum thickness values ​​that can be selected for the reinforcing beam 130 and the patch plate are larger than those for the upper plate 110 and the lower plate 120, so that the front bulkhead tends to form a structure that is thin at the top and bottom and thick in the middle. In the event of an impact, this is beneficial to ensure the integrity of the overall structure while guiding energy from the middle to the top and bottom. In high-speed collisions, this ensures the strength of the main structure of the front bulkhead and can better absorb energy.

[0064] It is understood that the thickness range of the reinforcing beam 130 can be applied to other embodiments where the reinforcing beam 130 is not segmented, and can also be applied to embodiments where, for example, the reinforcing beam 130 is divided into a middle beam 131, a left beam 132, and a right beam 133, as in this embodiment:

[0065] For example, in some embodiments, the reinforcing beam 130 is not segmented, the upper plate 110 is 0.8 mm thick, the lower plate 120 is 0.8 mm thick, the reinforcing beam 130 is 1.2 mm thick, and the patch plate is 1.2 mm thick; in other embodiments, the reinforcing beam 130 is not segmented, the upper plate 110 is 1.2 mm thick, the lower plate 120 is 1.4 mm thick, the reinforcing beam 130 is 2 mm thick, and the patch plate is 1.8 mm thick; in yet another embodiment, the reinforcing beam 130 is divided into a middle beam 131, a left beam 132, and a right beam 133. 33. The thickness of the upper plate 110 is 0.8mm, the thickness of the lower plate 120 is 0.8mm, the thickness of the middle crossbeam 131 is 1.2mm, the thickness of the left crossbeam 132 and the right crossbeam 133 is 1.3mm, and the thickness of the patch plate is 1.2mm; for example, in some other embodiments, the reinforcing crossbeam 130 is divided into a middle crossbeam 131, a left crossbeam 132 and a right crossbeam 133, the thickness of the upper plate 110 is 1.2mm, the thickness of the lower plate 120 is 1.4mm, the thickness of the middle crossbeam 131 is 1.9mm, the thickness of the left crossbeam 132 and the right crossbeam 133 is 2mm, and the thickness of the patch plate is 1.8mm.

[0066] In another embodiment, based on the structure of the reinforcing beam 130 divided into a middle beam 131, a left beam 132, and a right beam 133, a specific implementation scheme for the thickness of each segment of the reinforcing beam 130 is also provided. The thickness of the middle beam 131 is 0.8mm-1.2mm, and the thickness of the left beam 132 and the right beam 133 is 1.4mm-2mm. For example, in some embodiments, the thickness of the middle beam 131 is 0.8mm, and the thickness of the left beam 132 and the right beam 133 is 1.4mm. In another embodiment, the thickness of the middle beam 131 is 1.2mm, and the thickness of the left beam 132 and the right beam 133 is 2mm. In the above embodiment, the minimum and maximum thickness values ​​of the left crossbeam 132 and the right crossbeam 133 are larger than those of the middle crossbeam 131. This is beneficial to further improve the front bulkhead's resistance to deformation during side impacts, while reducing the risk of deformation to the reinforcing crossbeam 130 when the energy of a frontal impact is transmitted to both sides. This is beneficial to improve the stress distribution of the reinforcing crossbeam 130 and further improve the strength of the front bulkhead.

[0067] In this embodiment, based on the specific implementation scheme of the thickness of each area of ​​the front bulkhead, a specific implementation scheme of the thickness of each section of the reinforcing beam 130 is further applied. For example, in this embodiment, the thickness of the middle beam 131 can be any value in the thickness range of the middle beam 131, such as 0.9mm; the thickness of the left beam 132 and the right beam 133 can be any value in the thickness range of the left beam 132 and the right beam 133, such as 1.6mm; the thickness of the upper plate 110 can be any value in the thickness range of the upper plate 110, such as 1mm; the thickness of the lower plate 120 can be any value in the thickness range of the lower plate 120, such as 1.1mm; and the thickness of the patch plate can be any value in the thickness range of the patch plate, such as 1.5mm. In this embodiment, based on the combination of the above-mentioned thickness selection scheme, the front bulkhead has improved its resistance to deformation during side impacts, while the overall energy transfer trend is towards the upper plate 110 and the lower plate 120. During high-speed collisions, the upper plate 110 and the lower plate 120 deform first to absorb energy, reducing the deformation of the reinforcing beam 130 to ensure that the deformation of the main body of the front bulkhead is as small as possible, which is conducive to further improving the overall structural strength and enhancing safety.

[0068] In this embodiment, the tensile strength of the reinforcing beam 130 is greater than that of the upper plate 110 and the lower plate 120. The reinforcing beam 130 has a larger tensile strength and can withstand a larger impact force during high-speed collisions to ensure stable energy transfer, reduce the overall deformation of the front bulkhead, and ensure the safety of the occupants. The upper plate 110 and the lower plate 120 have lower tensile strength and are more likely to deform than the reinforcing beam 130, thereby absorbing energy and preventing the front bulkhead from breaking as a whole and causing injury to the occupants.

[0069] Furthermore, in some embodiments, the tensile strength of the upper plate 110 and the lower plate 120 is 500 MPa-800 MPa, and the tensile strength of the reinforcing beam 130 is 1300 MPa-1650 MPa. For example, in some embodiments, the tensile strength of the upper plate 110 and the lower plate 120 is 500 MPa, and the tensile strength of the reinforcing beam 130 is 1300 MPa. In other embodiments, the tensile strength of the upper plate 110 and the lower plate 120 is 800 MPa, and the tensile strength of the reinforcing beam 130 is 1650 MPa. In this embodiment, the tensile strength of the upper plate 110 and the lower plate 120 can be any value within the range of 500 MPa-800 MPa, such as 650 MPa, and the tensile strength of the reinforcing beam 130 can be any value within the range of 1300 MPa-1650 MPa, such as 1500 MPa.

[0070] In another embodiment, this application provides a method for manufacturing a front bulkhead, which in this embodiment is used to manufacture the front bulkhead described in the foregoing embodiments. Please refer to [link to previous document]. Figure 5 , Figure 5 A flowchart illustrating a front bulkhead manufacturing method, as shown in an exemplary embodiment of this application, is provided. The front bulkhead manufacturing method includes the following steps:

[0071] Step S510: Provide blanks and uniformly cut the blanks. The blanks include upper plate blanks, lower plate blanks, reinforcing crossbeam blanks, and patch plate blanks.

[0072] Step S520: Weld the blank after blanking to obtain a welded plate with an integral plate structure;

[0073] Step S530: Heat the welding plate until it is fully austenitized to obtain an austenitized plate;

[0074] Step S540: The austenitized material plate is subjected to hot stamping forming to obtain a hot stamping formed material plate.

[0075] Step S550: Cool the hot stamping forming sheet until it is fully martensitized to obtain a martensitized sheet.

[0076] Step S560: Cut the edge material of the martensitic material plate to obtain the front panel.

[0077] For steps S510-S520, the blanks need to be uniformly cut first, and then the blanks are welded into a whole welded plate. The uniform cutting here refers to placing the blanks of each part together according to the connection relationship of each part of the front bulkhead to form the structural base of the front bulkhead. The welding process is to weld the blanks of each part of the structural base together by means of appropriate welding method for transportation and processing. In some embodiments, the cutting and welding processes can also be carried out with the help of tooling, fixtures and other auxiliary tools that are adapted to the structural size of the blanks for blank placement or auxiliary positioning.

[0078] In step S530, the welding plate is heated as a whole to make it completely austenitic. Austenite is a lamellar microstructure of steel. Austenite has good plasticity, low strength, and certain toughness, and is suitable for pressure forming. Therefore, heating the welding plate to obtain an austenitic plate can facilitate hot stamping forming in subsequent steps.

[0079] For step S540, hot stamping refers to the process of forming the material under heating or high temperature conditions to cause deformation, thereby obtaining the required structural part. In this embodiment, the hot stamping process is carried out by hot die stamping, for example.

[0080] In step S550, the hot-stamped forming sheet is cooled. During the cooling process, austenite transforms into martensite. Martensite has high strength and hardness, making it suitable as the main material of the front bulkhead. This process fully martensitizes the hot-stamped forming sheet, which helps to meet the material strength requirements of the front bulkhead.

[0081] For step S560, the edge material is cut according to the design size requirements and opening requirements of the front bulkhead to obtain the finished front bulkhead. The cutting method here includes, but is not limited to, laser cutting.

[0082] As described in steps S510-S560 above, the blanks are uniformly cut and welded into an integral plate structure. The integral plate structure is then heated, formed, cooled, and cut to obtain the front bulkhead. The front bulkhead obtained by this method can meet the structural requirements of sequential connection of the upper plate, reinforcing beam, and lower plate, and the patch plate and the connection point are kept in close contact. While meeting the requirements of vehicle body lightweighting, it can improve the overall stress distribution of the front bulkhead when bearing load and improve the safety of the vehicle during a collision.

[0083] Furthermore, the front bulkhead obtained through the above steps, with its upper plate, lower plate, reinforcing crossbeam, and patch plate, is formed into a single structure by hot stamping. The front bulkhead with a single structure obtained by hot stamping does not require connection between the various areas through connectors, nor does it require additional connection or sealing. This not only further meets the requirements for vehicle lightweighting, but also improves load distribution and reduces stress concentration through the overall load-bearing method of the single structure, thereby further improving the overall strength. This is beneficial for balancing lightweighting and safety requirements.

[0084] This embodiment specifically illustrates one implementation scheme for material unloading; please refer to [link / reference]. Figure 6 , Figure 6 The flowchart illustrates a specific embodiment of step S510 of the front panel manufacturing method as an exemplary embodiment of this application. Step S510, namely the step of providing a blank and uniformly cutting the blank, includes the following steps:

[0085] Step S610: Based on the positional relationship between the upper plate, the reinforcing beam, and the lower plate in the front bulkhead, the upper plate blank, the reinforcing beam blank, and the lower plate blank are cut into the same plane and spliced ​​together.

[0086] Step S620: Drop the patch plate blank to the splicing position of the upper plate blank and the reinforcing beam blank, and / or the splicing position of the reinforcing plate blank and the lower plate blank.

[0087] For steps S610-S620, hot-stamped steel is used as blanking material. Hot-stamped steel has excellent strength and ductility, and is suitable for use in the front panel. As can be easily understood from steps S510-S520, the purpose of blanking is to pre-assemble the blank according to the final structure required for the front panel, so as to facilitate the overall processing in subsequent steps.

[0088] In this embodiment, step S520, which is the step of welding the blank after it has been cut to obtain a welded plate with an integral plate structure, specifically includes the following steps:

[0089] Laser welding is performed at the joint positions between the upper plate blank, the reinforcing beam blank, and the lower plate blank.

[0090] Spot welding is used to fix the edges of the patch plate blank to other blanks.

[0091] Regarding the above steps, it is understandable that the upper plate, lower plate, and reinforcing beam in the front bulkhead are relatively large, and it is more convenient to use laser welding for the corresponding blanks. The purpose of the welding process here is only to ensure the positional relationship so that the hot-stamped sheet structure after the subsequent hot stamping process meets the structural design requirements of the front bulkhead. It is worth noting that the connection of the upper plate, lower plate, and reinforcing beam corresponds to the laser welding position of the upper plate blank, lower plate blank, and reinforcing beam blank. Therefore, the blanking position of the patch plate should be at the weld of the laser welding.

[0092] In this embodiment, for ease of understanding, based on steps S610-S620, an exemplary distribution of the billet dropping positions is also shown. Please refer to [link / reference]. Figure 7 , Figure 7 This is a schematic diagram illustrating the positional distribution of various blanks during blanking in the front bulkhead manufacturing method of an exemplary embodiment of this application. Specifically, the upper plate blank includes an upper plate blank 710, the lower plate blank includes a lower plate blank 720, and the reinforcing beam blanks include a middle beam blank 731, a left beam blank 732, and a right beam blank 733. Corresponding to the structure of the front bulkhead, the upper plate blank 710 and the lower plate blank 720... The blanks 731, 732, and 733 of the middle crossbeam blanks are respectively cut and assembled between the upper blank 710 and the lower blank 720. The first patch blank 741 is cut at the joint between the upper blank 710 and the middle crossbeam blank 731, and the second patch blank 742 is cut at the joint between the lower blank 720 and the middle crossbeam blank 731.

[0093] In this embodiment, step S530, namely the step of heating the welding plate until it is fully austenitized to obtain an austenitized plate, includes: placing the welding plate in a heating furnace for heating at a temperature of 930°C-950°C for a heating time of 3 min-5 min. For example, in some embodiments, the heating temperature is controlled at 930°C and the heating time at 5 min; in other embodiments, the heating temperature is controlled at 950°C and the heating time at 3 min; and in yet another embodiment, the heating temperature is controlled at 940°C and the heating time at 4 min.

[0094] In this embodiment, in step S550, which is the step of cooling the hot stamping forming plate to complete martensite and obtaining the martensite plate, the cooling method of the hot stamping forming plate is quenching with quenching liquid. The cooling conditions include cooling to 10℃-20℃ with a temperature drop gradient of greater than or equal to 30℃ / s. It can be understood that a temperature drop gradient of greater than or equal to 30℃ / s means that the temperature of the hot stamping forming plate decreases by no less than 30℃ per second during the quenching and cooling process. When quenched to 10℃-20℃, the hot stamping forming plate is completely austenitized, that is, the austenite therein is completely transformed into martensite.

[0095] In this embodiment, the hot stamping forming process includes placing the austenitized material plate in a hot stamping die for hot stamping forming. Further, step S550, which is the step of cooling the hot stamping forming material plate until it is completely martensitized to obtain a martensitized material plate, is completed in the hot stamping die. Specifically, in some possible application scenarios, a liquid supply pipeline is provided in the hot stamping die to supply quenching liquid to the die for cooling and quenching the hot stamping forming material plate. In other possible application scenarios, the hot stamping die is placed in a quenching liquid pool, and the quenching liquid in the quenching liquid pool quenches the hot stamping forming material plate in the hot stamping die. It can be understood that the temperature environment in the hot stamping die is relatively stable, and the temperature drop gradient of the hot stamping forming material plate in the hot stamping die is easy to control. For example, in some application scenarios, a temperature detection unit such as a temperature sensor is provided in the hot stamping die to monitor the temperature of the hot stamping forming material plate in the hot stamping die in real time during the quenching process.

[0096] In yet another embodiment, this application also provides a vehicle, the vehicle including an engine compartment and a passenger compartment, with a front bulkhead shown in the foregoing embodiments installed between the engine compartment and the passenger compartment.

[0097] In summary, in the front bulkhead, the front bulkhead manufacturing method, and the vehicle shown in the above embodiments, the front bulkhead is connected in sequence by an upper plate, a reinforcing beam, and a lower plate, and the patch plate is kept in close contact with the connection. While satisfying the requirements for vehicle body lightweighting, it can improve the overall stress distribution of the front bulkhead when it is under load, thereby improving the safety of the vehicle during a collision.

[0098] Furthermore, the front bulkhead, which is formed by hot stamping, does not require connecting parts between different areas, nor does it require additional connections or seals. This not only further meets the requirements for vehicle lightweighting, but also improves load distribution and reduces stress concentration through the overall load-bearing method of the integrated structure, thereby further improving overall strength. This approach is beneficial for balancing lightweighting and safety requirements.

[0099] Furthermore, one embodiment of this application also provides an electronic device to illustrate one application scenario of the front panel manufacturing method in the foregoing embodiments. The electronic device includes: one or more processors; and a storage device for storing one or more programs. When the one or more programs are executed by the one or more processors, the electronic device enables or acts as a control terminal to control other devices, equipment, or automated production lines to implement the front panel manufacturing method provided in the foregoing embodiments.

[0100] Figure 8 A schematic diagram of a computer system suitable for implementing the embodiments of this application is shown. It should be noted that... Figure 8The computer system 800 of the electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0101] like Figure 8 As shown, the computer system 800 includes a Central Processing Unit (CPU) 801, which can perform various appropriate actions and processes based on programs stored in Read-Only Memory (ROM) 802 or programs loaded from storage portion 808 into Random Access Memory (RAM) 803, such as performing the methods described in the above embodiments. The RAM 803 also stores various programs and data required for system operation. The CPU 801, ROM 802, and RAM 803 are interconnected via a bus 804. An Input / Output (I / O) interface 805 is also connected to the bus 804.

[0102] The following components are connected to I / O interface 805: an input section 806 including a keyboard, mouse, etc.; an output section 807 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 808 including a hard disk, etc.; and a communication section 809 including a network interface card such as a LAN (Local Area Network) card, modem, etc. The communication section 809 performs communication processing via a network such as the Internet. A drive 810 is also connected to I / O interface 805 as needed. A removable medium 811, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on drive 810 as needed so that computer programs read from it can be installed into storage section 808 as needed.

[0103] Specifically, according to embodiments of this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program including a computer program for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 809, and / or installed from removable medium 811. When the computer program is executed by central processing unit (CPU) 801, it performs various functions defined in the system of this application.

[0104] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying a computer-readable computer program. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.

[0105] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. Each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0106] The units described in the embodiments of this application can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself.

[0107] Another aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a computer's processor, causes the computer to perform the front panel manufacturing method as described above. This computer-readable storage medium may be included in the electronic device described in the above embodiments, or it may exist independently and not assembled into the electronic device.

[0108] Another aspect of this application provides a computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the front panel manufacturing method provided in the various embodiments described above.

[0109] The above embodiments are merely illustrative of the principles and effects of the present invention or are preferred embodiments provided to fully illustrate the present invention, and are not intended to limit the present invention, nor is the scope of protection of the present invention limited thereto. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention, and equivalent substitutions or transformations made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A front bulkhead panel for installation at the front of a vehicle's cargo compartment, characterized in that, include: The assembly includes an upper plate, a lower plate, a reinforcing beam, and a patch plate. The reinforcing beam connects the upper plate and the lower plate, and the patch plate is attached to the connection between the upper plate and the reinforcing beam, and the connection between the lower plate and the reinforcing beam. The upper plate, the lower plate, the reinforcing beam, and the patch plate are hot-stamped into an integral structure. The reinforcing crossbeam includes a middle crossbeam, a left crossbeam, and a right crossbeam. The left crossbeam and the right crossbeam are respectively connected to the left and right sides of the middle crossbeam, and the left crossbeam and the right crossbeam are bent toward the side where the front panel is connected to the carriage, so that the reinforcing crossbeam has a U-shaped structure. The patch panel includes a first patch panel and a second patch panel. The first patch panel is attached to the side of the front bulkhead that connects to the carriage and is located at the connection between the upper panel and the middle crossbeam. The second patch panel is attached to the side of the front bulkhead that connects to the carriage and is located at the connection between the lower panel and the middle crossbeam. The lower plate is provided with longitudinally distributed central channel reinforcing ribs, which form a T-shaped structure with the central crossbeam. The central channel reinforcing ribs protrude toward the side where the front bulkhead connects to the carriage, and the second patch plate is at least partially attached to the central channel reinforcing ribs.

2. The front bulkhead according to claim 1, characterized in that: The thickness of the left crossbeam and the right crossbeam is greater than or equal to the thickness of the middle crossbeam.

3. The front bulkhead according to claim 1 or 2, characterized in that: The thickness of the middle crossbeam is 1.2mm-1.8mm, and the thickness of the left and right crossbeams is 1.4mm-2mm.

4. The front bulkhead according to claim 1 or 2, characterized in that: The thickness of the upper plate is 0.8mm-1.2mm, the thickness of the lower plate is 0.8mm-1.4mm, the thickness of the reinforcing beam is 1.2mm-2mm, and the thickness of the patch plate is 1.2mm-1.8mm.

5. The front bulkhead according to claim 1 or 2, characterized in that: The tensile strength of the reinforcing beam is greater than that of the upper plate and the lower plate.

6. The front bulkhead according to claim 5, characterized in that: The upper plate and the lower plate have a tensile strength of 500MPa-800MPa, and the reinforcing beam has a tensile strength of 1300MPa-1650MPa.

7. A method for manufacturing a front bulkhead, characterized in that, The method for manufacturing the front bulkhead as described in any one of claims 1-6 comprises the following steps: Provide blanks, and uniformly cut the blanks. The blanks include upper plate blanks, lower plate blanks, reinforcing crossbeam blanks, and patch plate blanks. The blanks that have been cut are then welded to obtain a welded plate with an integral plate structure. The welding plate is heated until it is fully austenitized to obtain an austenitized plate. The austenitic material sheet is subjected to hot stamping forming process to obtain a hot stamping formed material sheet; Cool the hot-stamped sheet until it is fully martensitized to obtain a martensitized sheet. The edge material of the martensitic sheet is cut to obtain the front panel.

8. The method for manufacturing the front bulkhead according to claim 7, characterized in that, The steps of providing the blank and uniformly cutting the blank include: Based on the positional relationship between the upper plate, the reinforcing beam, and the lower plate in the front bulkhead, the upper plate blank, the reinforcing beam blank, and the lower plate blank are correspondingly cut into the same plane and spliced ​​together; The patch plate blank is dropped to the joint position of the upper plate blank and the reinforcing beam blank, and the joint position of the reinforcing beam blank and the lower plate blank.

9. The method for manufacturing a front bulkhead according to claim 8, characterized in that, The step of welding the blank after it has been blanked to obtain a welded plate with an integral plate structure includes: Laser welding is performed on the splicing positions between the upper plate blank, the reinforcing beam blank, and the lower plate blank; The edges of the patch plate blank are spot-welded to fix it to other blanks.

10. The method for manufacturing a front bulkhead according to claim 7, characterized in that, The step of heating the welding plate until it is fully austenitized to obtain an austenitized plate includes: placing the welding plate in a heating furnace and heating it at a temperature of 930℃-950℃ for 3min-5min.

11. The method for manufacturing a front bulkhead according to claim 7, characterized in that: The cooling method for the hot stamping formed plate is quenching with quenching liquid, and the cooling conditions include cooling to 10℃-20℃ with a temperature drop gradient of greater than or equal to 30℃ / s.

12. The method for manufacturing a front bulkhead according to claim 7, characterized in that: The hot stamping forming process includes placing the austenitic material plate in a hot stamping die for hot stamping forming.

13. The method for manufacturing a front bulkhead according to claim 12, characterized in that: The step of cooling the hot-stamped sheet until it is fully martensitized to obtain a martensitized sheet is performed within the hot-stamping die.

14. A vehicle, characterized in that: The vehicle has a front bulkhead as described in any one of claims 1-6 installed between the engine compartment and the passenger compartment.

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