Method for manufacturing a body structure member and vehicle

Abstract

This invention discloses a method for manufacturing a vehicle body structural component and a vehicle. The manufacturing method includes: cutting a straight tubular extruded aluminum profile, wherein the extruded aluminum profile has at least two cavities; bending the cut straight tubular extruded aluminum profile using a bending process; preforming the bent tubular extruded aluminum profile using a cold stamping process; and bulging the preformed extruded aluminum profile using a hydraulic bulging process to form a vehicle body structural component with at least two cavities and locally recessed outer surfaces. By using a hydraulic forming process to bulge the preformed extruded aluminum profile, the shape of the original extruded aluminum profile's outer surface is changed. This allows for the processing of aluminum alloy profiles into the required irregular cross-section parts according to the structural requirements of vehicle body components, providing greater flexibility in space utilization and clearance, enabling the use of more aluminum alloy profiles in the vehicle body, reducing costs, increasing component rigidity and strength, enhancing passive safety, and improving lightweighting.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a method for manufacturing a vehicle body structural component and a vehicle. Background Technology

[0002] With the continuous development of new energy in the automotive industry, the demand for lightweight components in automobiles is increasing. Since extruded aluminum profiles can be extruded into closed complex cross sections of specific shapes by an extrusion press, the rigidity and strength of the parts can be effectively improved. The mold development cost is low, the cycle is short, and the material utilization rate is high. Currently, they are widely used in body structural parts, such as front and rear anti-collision beams, front longitudinal beams, energy absorption boxes, etc.

[0003] However, the parts currently manufactured using extruded aluminum profiles have a flat and uniform surface shape, and the consistency of the bent tubes is poor. When used in body structural components, they have problems such as clearance space and structural limitations, which prevent them from being used more in the body. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a manufacturing method for vehicle body structural components, which utilizes a hydroforming process to bulge and change the outer surface shape of the original extruded aluminum profile, thereby processing the required irregular cross-section parts and improving the rigidity, strength, and lightweight of the parts.

[0005] The present invention further proposes a vehicle.

[0006] According to a first aspect of the present invention, a method for manufacturing a vehicle body structural component includes: cutting a straight tubular extruded aluminum profile, the extruded aluminum profile having at least two cavities; bending the cut straight tubular extruded aluminum profile using a bending process; preforming the bent tubular extruded aluminum profile using a cold stamping process; and bulging the preformed extruded aluminum profile using a hydraulic bulging process to form a vehicle body structural component having at least two cavities with partially recessed outer surfaces.

[0007] According to the manufacturing method of the vehicle body structural parts of the present invention, the pre-formed extruded aluminum profile is expanded by hydraulic forming process, which changes the outer surface shape of the original extruded aluminum profile. According to the structural requirements of the vehicle body parts, the aluminum alloy profile can be processed into the required irregular cross-section parts, which allows for more flexible use of space and avoidance space, enabling the vehicle body to use more aluminum alloy profiles, reducing costs, improving the rigidity and strength of parts, increasing passive safety, and improving the degree of lightweighting.

[0008] According to some embodiments of the present invention, the manufacturing method of filling and expanding the preformed extruded aluminum profile by hydraulic bulging process further includes: pressing the preformed tube using a hydraulic bulging mold and a first hydraulic press; a sealing head is sandwiched between the first hydraulic press and the preformed extruded aluminum profile, the shape of the sealing head being adapted to the cavity of the extruded aluminum profile.

[0009] According to some embodiments of the present invention, the manufacturing method of filling and expanding a preformed extruded aluminum profile by hydraulic bulging further includes: placing the preformed extruded aluminum profile in a hydraulic bulging mold, with the two ends sealed by the end caps pushed by the first hydraulic press; adjusting the position of the preformed extruded aluminum profile according to the positioning of the hydraulic bulging mold; moving the upper mold of the hydraulic bulging mold downward to close with the lower mold, wherein at least one protrusion is provided on the upper mold and / or the lower mold; filling the preformed tube with high-pressure liquid to form a local depression on the outer surface of the preformed extruded aluminum profile that matches at least one of the protrusions.

[0010] According to some embodiments of the present invention, the manufacturing method of filling and expanding the preformed extruded aluminum profile by hydraulic bulging process further includes: a pressure regulating valve is provided in the cavity to control the internal pressure of the cavity.

[0011] According to some embodiments of the present invention, the manufacturing method of bending the cut straight tubular extruded aluminum profile by bending process further includes: pressing the straight tubular extruded aluminum profile with a second hydraulic press and bending die.

[0012] According to some embodiments of the present invention, the manufacturing method of pressing a straight tubular extruded aluminum profile using a second hydraulic press and a bending die further includes: placing the straight tubular extruded aluminum profile into the bending die; adjusting the position of the straight tubular extruded aluminum profile according to the positioning of the bending die; using pressure blocks to press and restrict the displacement of the first and last ends of the straight tubular extruded aluminum profile to ensure the angle between the port and the center line; and moving the upper die of the bending die downward to close with the lower die, so that the extruded aluminum profile forms a curved arc.

[0013] According to some embodiments of the present invention, in the bending die, the upper and lower dies are closed to form a bending arc, the displacement of the upper die is h, the bending arc is β, and the upper die displacement and bending angle satisfy the following relationships: 0 < h ≤ 80 mm, 0 < β ≤ 25°.

[0014] According to some embodiments of the present invention, the manufacturing method of preforming the bent extruded aluminum profile by cold stamping further includes: pressing the bent extruded aluminum profile using a preforming mold and a third hydraulic press.

[0015] According to some embodiments of the present invention, the manufacturing method of pressing the bent extruded aluminum profile using a pre-forming mold and a third hydraulic press further includes: placing the bent extruded aluminum profile into the pre-forming mold and adjusting the position of the bent extruded aluminum profile according to the positioning of the pre-forming mold; the upper mold of the pre-forming mold moves downward to close with the lower mold, so that the bent extruded aluminum profile forms a locally concave shape.

[0016] According to a second aspect of the present invention, the vehicle body structural components are manufactured using the manufacturing method of the vehicle body structural components.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the structure of a hydraulic bulging mold according to an embodiment of the present invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the structure of a hydraulic bulging mold according to an embodiment of the present invention. Figure 2 ;

[0021] Figure 3 yes Figure 2 Partial schematic diagram A;

[0022] Figure 4 This is a cross-sectional view of a hydraulic bulging mold according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the bending die according to an embodiment of the present invention. Figure 1 ;

[0024] Figure 6 This is a schematic diagram of the bending die according to an embodiment of the present invention. Figure 2 ;

[0025] Figure 7 This is a schematic diagram of the structure of a preforming mold according to an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of a hydraulic bulging mold according to an embodiment of the present invention. Figure 3 .

[0027] Figure label:

[0028] 10. Extruded aluminum profile; 11. Cavity; 12. End cap; 13. Hydraulic cylinder; 14. Upper die; 15. Lower die; 16. Hydraulic system;

[0029] 20. Hydraulic bulging mold;

[0030] 30. Bending die;

[0031] 40. Pre-forming mold. Detailed Implementation

[0032] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0033] The following is for reference. Figures 1-8 A method for manufacturing a vehicle body structural component according to an embodiment of the present invention is described, and the present invention also proposes a vehicle.

[0034] Reference Figure 1-8 As shown, the manufacturing method of the vehicle body structural component of this invention includes: cutting a straight tubular extruded aluminum profile 10, wherein the extruded aluminum profile 10 has at least two cavities 11; bending the cut straight tubular extruded aluminum profile 10 by a bending process; preforming the bent tubular extruded aluminum profile 10 by a cold stamping process; and filling and expanding the preformed extruded aluminum profile 10 by a hydraulic bulging process to form a vehicle body structural component with at least two cavities 11 and a partially recessed outer surface.

[0035] First, extrusion is an efficient, economical, and flexible method for producing aluminum products. It can provide aluminum profiles of various shapes and sizes. Extruded aluminum profiles 10 can be made by extruding aluminum material into a specific cross-section using an extruder for various applications, such as building doors and windows, automotive components, and industrial parts.

[0036] The manufacturing method of extruded aluminum materials is as follows: First, aluminum casting rods are extruded. Before extrusion, the aluminum casting rods must be heated to soften them. Then, the heated aluminum casting rods are placed into the billet cylinder of the extrusion press. The extrusion rods are pushed by high-power hydraulic pressure. There is an extrusion pad at the front end of the extrusion rod. In this way, the heated and softened aluminum alloy is extruded from the precision forming hole of the die under the strong pressure of the extrusion pad to obtain the final product. Then, the required parts are manufactured through processes such as blanking, bending, and cutting.

[0037] Secondly, with the continuous development of new energy in the automotive industry, the demand for lightweight components in automobiles is increasing. Since extruded aluminum profiles 10 can be extruded into closed complex cross sections of specific shapes by an extruder, the rigidity and strength of the parts are effectively improved. The mold development cost is low, the cycle is short, and the material utilization rate is high. Currently, they are widely used in body structural parts, such as front and rear anti-collision beams, front longitudinal beams, energy absorption boxes, etc.

[0038] However, in addition to extruded aluminum materials, existing vehicle body structural parts also come in two other forms: sheet-type structural parts and box-type welded structural parts. Sheet-type structural parts are beam-like parts manufactured by stretching, punching, and shearing sheet metal using molds. Box-type welded structural parts are closed-section beam-like parts formed by fastening and welding two sheet-type structural parts together.

[0039] The rigidity and strength of the sheet-type body structure components are low, which cannot meet the safety requirements of the whole vehicle. The welding edge of the single sheet structure is short when it overlaps with other components, which cannot ensure the connection strength. The overlapping edge of the two parts of the box-type body structure components will increase the weight of the parts, which cannot meet the requirements of the whole vehicle's lightweighting. In addition, the complex process steps lead to high part costs.

[0040] Therefore, compared with sheet-like structural parts and box-shaped welded structural parts, extruded aluminum materials are better able to meet the lightweight requirements of automotive parts and can ensure the strength and rigidity of the parts. However, the parts currently manufactured using extruded aluminum profiles have a flat and uniform surface shape and poor consistency in the bends. In the application of body structural parts, there are problems such as clearance space and structural limitations.

[0041] This invention employs a method for manufacturing a vehicle body structural component. By using a hydroforming process, high-pressure liquid is injected into the interior of an extruded aluminum profile 10 to achieve expansion and change the shape of the original extruded aluminum profile 10's outer surface. Based on the structural requirements of the vehicle body components, the required irregular cross-section parts are processed, solving problems such as the strength, lightweighting, clearance space, and structural constraints of vehicle body components.

[0042] The specific manufacturing method is as follows: First, use a metal circular saw to cut the straight tubular extruded aluminum profile 10. The technical requirement is a length of 1500mm and an accuracy requirement of ±1.5mm. Then, remove the burrs at the ends. The extruded aluminum profile 10 has at least two cavities 11. Compared with extruded aluminum profiles with a single cavity 11, it has higher strength and can improve the safety of the vehicle body. In addition, depending on different needs, the aluminum profile can also have three or more cavities 11.

[0043] After obtaining a suitable extruded aluminum profile 10, the cut straight tubular extruded aluminum profile 10 is bent through a bending process. After bending, the shape of the extruded aluminum profile 10 changes, which can meet the various shapes required by different parts, so as to achieve better assembly and application effects. Furthermore, by bending the extruded aluminum profile 10, the profile's curves, arcs, rounded corners and other designs can be realized to meet the functional requirements of structural strength, sound insulation, light guiding and other functions.

[0044] Then, the bent extruded aluminum profile 10 is preformed by cold stamping process, which can cut, form or punch the metal material to provide the required metal parts for subsequent processing and assembly. It can efficiently produce a large number of metal parts with high precision and consistency.

[0045] Finally, the pre-formed extruded aluminum profile 10 is filled and expanded by hydraulic bulging process. That is, the hydraulic system 16 applies high pressure to the inside of the extruded aluminum profile 10, so that it undergoes plastic deformation under the action of the mold. Due to the high pressure on the inside, the material will expand outward and gradually fill the shape of the mold to form a car body structural part with at least two cavities 11 and local concavity on the outer surface. It has high production efficiency and good processing accuracy, and can obtain accurate shape and size in one forming.

[0046] In addition, a hydraulic forming process can be used to pressurize the pre-formed extruded aluminum profile 10. A high-pressure liquid medium is applied through the hydraulic system 16 to transfer the pressure to the extruded aluminum profile. The high pressure causes the extruded aluminum profile to undergo plastic deformation and gradually fill the mold to form the desired shape.

[0047] Therefore, by using the manufacturing method of body structural components, the pre-formed extruded aluminum profile 10 is bulged by hydraulic forming process, which changes the outer surface shape of the original extruded aluminum profile 10. According to the structural requirements of body parts, the aluminum alloy profile can be processed into the required irregular cross-section parts, which allows for more flexible use of space and avoidance space, enabling the body to use more aluminum alloy profiles, reducing costs, improving the rigidity and strength of parts, increasing passive safety, and improving the degree of lightweighting.

[0048] Reference Figure 1-4 As shown, the manufacturing method of filling and expanding the pre-formed extruded aluminum profile 10 using a hydraulic bulging process further includes: pressing the pre-formed tube using a hydraulic bulging mold 20 and a first hydraulic press; a head 12 is sandwiched between the first hydraulic press and the pre-formed extruded aluminum profile 10, the shape of which is adapted to the cavity 11 of the extruded aluminum profile 10. The first hydraulic press can drive two hydraulic cylinders 13 to apply pressure to the extruded aluminum profile 10 using the hydraulic pressure generated by the hydraulic system 16. The head 12, with its shape adapted to the cavity 11, is sandwiched between the first hydraulic press and the pre-formed extruded aluminum profile 10, thus sealing both ends of the extruded aluminum profile 10. Pressure is applied to the head 12, thereby using hydraulic pressure to achieve internal bulging and change the outer surface shape of the original extruded aluminum profile 10, processing irregularly shaped cross-section parts required for the vehicle body structure, allowing for greater use of aluminum alloy profiles in the vehicle body, reducing costs, and improving lightweighting.

[0049] Reference Figure 4and Figure 8 As shown, the manufacturing method of filling and expanding the preformed extruded aluminum profile 10 by hydraulic bulging process further includes: placing the preformed extruded aluminum profile 10 in a hydraulic bulging mold 20, with the two ends sealed by the end caps 12 pushed by the first hydraulic press; adjusting the position of the preformed extruded aluminum profile 10 according to the positioning of the hydraulic bulging mold 20; moving the upper mold 14 of the hydraulic bulging mold 20 downward to close with the lower mold 15, with at least one protrusion provided on the upper mold 14 and / or the lower mold 15; filling the preformed tube with high-pressure liquid so that a local depression matching the at least one protrusion is formed on the outer surface of the preformed extruded aluminum profile 10.

[0050] The specific operating steps of the hydraulic bulging process are as follows: First, the pre-formed extruded aluminum profile 10 is placed in the hydraulic bulging mold 20. The hydraulic bulging mold is divided into an upper mold 14 and a lower mold 15. Both the upper and lower molds are provided with grooves for placing the extruded aluminum profile 10. The pre-formed extruded aluminum profile 10 is placed in the groove of the lower mold 15. The first hydraulic press pushes the end cap 12 to seal the cavities 11 at both ends of the extruded aluminum profile 10. Then, the position of the pre-formed extruded aluminum profile 10 is adjusted according to the positioning of the hydraulic bulging mold 20. The upper mold 14 of the hydraulic bulging mold 20 is then... The die moves downward to close with the lower die 15. At this time, the hydraulic expansion die is a sealed environment. High-pressure liquid is injected into the inside by the first hydraulic press, so that the die cavity 11 is constrained to perform mold expansion. Due to the high pressure on the inside, the material will expand outward, and the outer wall of the extruded aluminum profile 10 will gradually fit into the die cavity 11. Depending on the requirements of different parts, at least one protrusion is provided on the upper die 14 or the lower die 15. During the continuous expansion process, the extruded aluminum profile 10 is squeezed by the protrusion, forming a depression on the outer surface to form various irregular cross-section parts.

[0051] During the hydraulic expansion process, the two hydraulic cylinders 13 on the left and right push the end cap 12 to apply force and material to both ends of the profile tube, which can fill the groove of the mold or other required detailed shapes, ensuring that the profile completely fills the shape of the mold, making the shape of the finished product more accurate.

[0052] Furthermore, the manufacturing method of filling and expanding the pre-formed extruded aluminum profile 10 using a hydraulic bulging process also includes: a pressure regulating valve is provided in the cavity 11 to control the internal pressure of the cavity 11. Due to the different complexity, material properties, and wall thicknesses of the various parts, a pressure regulating valve is provided in the cavity 11 to adjust the internal pressure. By controlling the magnitude of the internal pressure, the shape change of the extruded aluminum profile 10 in the mold can be precisely adjusted and controlled, thereby obtaining the required shape and size. Moreover, by adjusting the internal pressure, the extruded aluminum profile 10 can be expanded uniformly in the mold, avoiding uneven wall thickness or excessive thinness, preventing material loss, and controlling the forming speed. In the embodiments of the present invention, the pressure value is generally controlled within the range of 100-200 MPa.

[0053] Reference Figure 5-6 As shown, the manufacturing method of bending the cut straight tubular extruded aluminum profile 10 through a bending process further includes: pressing the straight tubular extruded aluminum profile 10 using a second hydraulic press and a bending die 30. The hydraulic pressure generated by the second hydraulic press presses the straight tubular extruded aluminum profile 10 into a bent shape, which can meet the various shapes required by different parts to achieve better assembly and application effects. Furthermore, by bending the extruded aluminum profile 10, the profile's curves, arcs, rounded corners, and other designs can be realized to meet functional requirements such as structural strength, sound insulation, and light guiding.

[0054] Reference Figure 5-6 As shown, the manufacturing method of pressing a straight tubular extruded aluminum profile 10 using a second hydraulic press and a bending die 30 further includes: placing the straight tubular extruded aluminum profile 10 into the bending die 30; adjusting the position of the straight tubular extruded aluminum profile 10 according to the positioning of the bending die 30; using pressure blocks to press and restrict the displacement of the first and last ends of the straight tubular extruded aluminum profile 10 to ensure the angle between the port and the center line; and moving the upper die 14 of the bending die 30 downward to close with the lower die 15, so that the extruded aluminum profile 10 forms a curved arc.

[0055] That is, the specific operation steps of the bending process are as follows: First, the straight tubular extruded aluminum profile 10 is placed in the bending die 30. The bending die 30 is divided into an upper die 14 and a lower die 15. Both the upper and lower dies are provided with grooves for placing the straight tubular extruded aluminum profile 10. The straight tubular extruded aluminum profile 10 is placed in the groove of the lower die 15. Then, the position of the straight tubular extruded aluminum profile 10 is adjusted according to the positioning of the bending die 30. Pressure blocks are placed at the first and last ends of the straight tubular extruded aluminum profile 10. The pressure blocks are used to limit the displacement of the straight tubular extruded aluminum profile 10. Then, the upper die 14 of the bending die 30 is moved downward to close with the lower die 15. During the closing process, the straight tubular extruded aluminum profile 10 is pressed into a bent tube shape.

[0056] In the bending die 30, the upper die 14 and lower die 15 are closed to form a bending arc. The displacement of the upper die 14 is h, and the bending arc is β. The displacement of the upper die 14 and the bending angle satisfy the following relationships: 0 < h ≤ 80 mm, 0 < β ≤ 25°. That is, the displacement of the upper die 14 of the bending die 30 does not exceed 80 mm, and the bending arc of the extruded aluminum profile 10 does not exceed 25°.

[0057] Reference Figure 7As shown, the manufacturing method for preforming the bent-tube extruded aluminum profile 10 using a cold stamping process further includes: pressing the bent-tube extruded aluminum profile 10 using a preforming mold 40 and a third hydraulic press. The cold stamping process using the preforming mold 40 and the third hydraulic press creates localized indentations in the extruded aluminum profile 10, allowing it to be smoothly placed into the hydraulic bulging mold 20 for subsequent processing.

[0058] Reference Figure 7 As shown, the manufacturing method of pressing the bent extruded aluminum profile 10 using a pre-forming mold 40 and a third hydraulic press further includes: placing the bent extruded aluminum profile 10 into the pre-forming mold, adjusting the position of the bent extruded aluminum profile 10 according to the positioning of the pre-forming mold 40; moving the upper mold 14 of the pre-forming mold 40 downward to close with the lower mold 15, so that the bent extruded aluminum profile 10 forms a locally concave shape.

[0059] The specific operating steps of the cold stamping process are as follows: First, the bent tubular extruded aluminum profile 10 is placed into the pre-forming mold 40, which is divided into an upper mold 14 and a lower mold 15. Both the upper and lower molds are provided with grooves for placing the bent tubular extruded aluminum profile 10. The bent tubular extruded aluminum profile 10 is placed in the groove of the lower mold 15. Then, the position of the bent tubular extruded aluminum profile 10 is adjusted according to the positioning of the pre-forming mold 40. After the position is adjusted, the upper mold 14 of the pre-forming mold 40 is moved downward to close with the lower mold 15. During the closing process, a local concave shape is formed on the bent tubular extruded aluminum profile 10. The clamping force of the third hydraulic press is 150T.

[0060] According to a second aspect embodiment of the present invention, the vehicle body structural components are manufactured using a method for manufacturing body structural components.

[0061] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0063] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for manufacturing a vehicle body structural component, characterized in that, The manufacturing method includes: A straight tubular extruded aluminum profile is cut, wherein the extruded aluminum profile has at least two cavities; A second hydraulic press and a bending die are used to press straight tubular extruded aluminum profiles; The curved extruded aluminum profile is pre-formed using a cold stamping process; The pre-formed extruded aluminum profile is filled and expanded using a hydraulic bulging process to form a body structure with at least two cavities and a partially concave outer surface. The manufacturing method for filling and expanding pre-formed extruded aluminum profiles using a hydraulic bulging process further includes: The pre-formed pipe fittings are pressed using a hydraulic bulging mold and a first hydraulic press; An end cap is sandwiched between the first hydraulic press and the preformed extruded aluminum profile, and the shape of the end cap is adapted to the cavity of the extruded aluminum profile; During the hydraulic expansion process, the first hydraulic press pushes the end cap to apply force and replenish material at both ends of the pre-formed extruded aluminum profile; The manufacturing method for pressing straight tubular extruded aluminum profiles using a second hydraulic press and a bending die further includes: The straight tubular extruded aluminum profile is placed into the bending die; Adjust the position of the straight tubular extruded aluminum profile according to the positioning of the bending die; The first and last ends of the straight tubular extruded aluminum profile are clamped with pressure blocks to restrict its displacement, so as to ensure the angle between the port and the center line; The upper die of the bending die moves downward to close with the lower die, causing the extruded aluminum profile to form a curved arc. The upper and lower dies of the bending die are closed to form a bending arc. The displacement of the upper die is h, and the bending arc is β. The displacement of the upper die and the bending angle satisfy the following relationships: 0 < h ≤ 80 mm, 0 < β ≤ 25°.

2. The method for manufacturing a vehicle body structural component according to claim 1, characterized in that, The manufacturing method for filling and expanding pre-formed extruded aluminum profiles using a hydraulic bulging process further includes: The pre-formed extruded aluminum profile is placed in a hydraulic bulging mold, and the two ends are sealed by the end caps pushed by the first hydraulic press; The position of the pre-formed extruded aluminum profile is adjusted according to the positioning of the hydraulic bulging die. The upper die of the hydraulic bulging mold moves downward to close with the lower die, and the upper die and / or the lower die are provided with at least one protrusion; The preformed tube is filled with high-pressure liquid to form a local depression on the outer surface of the preformed extruded aluminum profile that is adapted to at least one of the protrusions.

3. The method for manufacturing a vehicle body structural component according to claim 2, characterized in that, The manufacturing method for filling and expanding pre-formed extruded aluminum profiles using a hydraulic bulging process further includes: A pressure regulating valve is provided inside the cavity to control the internal pressure of the cavity.

4. The method for manufacturing a vehicle body structural component according to claim 1, characterized in that, The manufacturing method for preforming bent tubular extruded aluminum profiles using a cold stamping process further includes: The curved extruded aluminum profile is pressed using a pre-forming mold and a third hydraulic press.

5. The method for manufacturing a vehicle body structural component according to claim 4, characterized in that, The manufacturing method for pressing bent extruded aluminum profiles using a pre-forming mold and a third hydraulic press further includes: The bent extruded aluminum profile is placed into the preforming mold; Adjust the position of the bent extruded aluminum profile according to the positioning of the pre-forming mold; The upper die of the preforming mold moves downward to close with the lower die, causing the bent extruded aluminum profile to form a locally concave shape.

6. A vehicle, characterized in that, The vehicle body structure is manufactured using the manufacturing method of any one of claims 1-5.

Images