Method for manufacturing vehicle body structural member and vehicle

Abstract

The invention discloses a manufacturing method of a vehicle body structural component and a vehicle, and the manufacturing method comprises the steps that a straight-pipe-shaped extruded aluminum profile is cut, and at least two cavities are formed in the extruded aluminum profile; the cut-off straight-pipe-shaped extruded aluminum profile is bent through a bending technology; carrying out preforming on the bent-pipe-shaped extruded aluminum profile through a cold stamping process; and the pre-formed extruded aluminum profile is subjected to mold filling expansion through a hydraulic expansion technology, so that the vehicle body structural part with at least two locally-sunken cavity outer surfaces is formed. The pre-formed extruded aluminum profile is subjected to mold filling expansion through the hydraulic forming process, the shape of the outer surface of the original extruded aluminum profile is changed through expansion, the aluminum alloy profile can be machined into the needed special-shaped section part according to the structural requirement of the automobile body part, space is more flexibly occupied and avoided, and the machining efficiency is improved. The automobile body is made of more aluminum alloy sections, the cost is reduced, the rigidity and strength of parts are improved, passive safety is improved, and the light weight degree is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a method for manufacturing a vehicle body structural component and a vehicle. Background Art

[0002] With the continuous development of new energy in the automotive industry, the demand for lightweight parts in automobiles has increased. Since extruded aluminum profiles can be extruded into closed complex cross-sections of specific shapes by extruders, the stiffness and strength of 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 single surface shape, and the consistency of the bent pipes is poor. When used in body structural parts, there are problems such as avoidance space and structural limitations, and they cannot be used more in the body. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a method for manufacturing a body structure, which uses a hydraulic forming process to achieve expansion to change the outer surface shape of the original extruded aluminum profile, and processes the required special-shaped cross-section parts to improve the rigidity, strength and lightness of the parts.

[0005] The present invention further provides a vehicle.

[0006] According to a method for manufacturing a vehicle body structural part in accordance with an embodiment of the first aspect of the present invention, the manufacturing method comprises: 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 by a bending process; pre-forming the bent tubular extruded aluminum profile by a cold stamping process; and filling and expanding the pre-formed extruded aluminum profile by a hydraulic bulging process to form a vehicle body structural part having at least two cavities with partially recessed outer surfaces.

[0007] According to the manufacturing method of the vehicle body structural parts of the embodiment of the present invention, the pre-formed extruded aluminum profile is filled with mold and expanded by using a hydraulic forming process, so as to change the outer surface shape of the original extruded aluminum profile by expanding. According to the structural requirements of the vehicle body parts, the aluminum alloy profile can be processed into the required special-section parts, which can occupy and avoid space more flexibly, so that the vehicle body can use more aluminum alloy profiles, reduce costs, improve the stiffness and strength of parts, increase passive safety, and improve the degree of lightweight.

[0008] According to some embodiments of the present invention, the manufacturing method of filling and expanding the pre-formed extruded aluminum profile through a hydraulic bulging process also includes: using a hydraulic bulging mold and a first hydraulic press to press the pre-formed pipe fitting; a head is clamped between the first hydraulic press and the pre-formed extruded aluminum profile, and the shape of the head is 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 the preformed extruded aluminum profile through the hydraulic bulging process also includes: placing the preformed extruded aluminum profile in a hydraulic bulging mold, and the first hydraulic press pushes the head seal at both ends; adjusting the position of the preformed extruded aluminum profile according to the positioning of the hydraulic bulging mold; the upper mold of the hydraulic bulging mold moves downward to close with the lower mold, and at least one protrusion is provided on the upper mold and / or the lower mold; the preformed tube is filled with high-pressure liquid so that the outer surface of the preformed extruded aluminum profile forms a local depression that matches at least one of the protrusions.

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

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

[0012] According to some embodiments of the present invention, the manufacturing method of using a second hydraulic press and a press-bending die to press a straight tubular extruded aluminum profile also includes: placing the straight tubular extruded aluminum profile into the press-bending die; adjusting the position of the straight tubular extruded aluminum profile according to the positioning of the press-bending die; using a pressing block to press the head and tail ends of the straight tubular extruded aluminum profile to limit its displacement to ensure the angle between the port and the center line; the upper die of the press-bending die moves downward to close with the lower die, so that the extruded aluminum profile forms a bending arc.

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

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

[0015] According to some embodiments of the present invention, the manufacturing method for pressing the curved tubular extruded aluminum profile using a preforming mold and a third hydraulic press also includes: placing the curved tubular extruded aluminum profile into the preforming mold and adjusting the position of the curved tubular extruded aluminum profile according to the positioning of the preforming mold; the upper mold of the preforming mold moves downward to close with the lower mold, so that the curved tubular extruded aluminum profile forms a local concave shape.

[0016] According to the vehicle of the second embodiment of the present invention, the body structure of the vehicle is manufactured using the method for manufacturing the body structure.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 1 Schematic diagram of the structure of the hydraulic bulging die according to an embodiment of the present invention Figure 1 ;

[0020] Figure 2 Schematic diagram of the structure of the hydraulic bulging die according to an embodiment of the present invention Figure 2 ;

[0021] Figure 3 yes Figure 2 A partial schematic diagram in FIG.

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

[0023] Figure 5 Schematic diagram of the structure of the bending die according to an embodiment of the present invention Figure 1 ;

[0024] Figure 6 Schematic diagram of the structure of the bending die according to an embodiment of the present invention Figure 2 ;

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

[0026] Figure 8 Schematic diagram of the structure of the hydraulic bulging die according to an embodiment of the present invention Figure 3 .

[0027] Reference numerals:

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

[0029] 20. Hydraulic bulging die;

[0030] 30. Bending die;

[0031] 40. Preforming mold. DETAILED DESCRIPTION

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

[0033] Reference below Figure 1-Figure 8 A method for manufacturing a vehicle body structure according to an embodiment of the present invention is described, and the present invention also provides a vehicle.

[0034] Reference Figure 1-8 As shown, a method for manufacturing a vehicle body structural part of an embodiment of the present invention comprises: 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 expanding the preformed extruded aluminum profile 10 by a hydraulic bulging process to form a vehicle body structural part having at least two cavities 11 with partially concave outer surfaces.

[0035] First of all, extrusion is an efficient, economical and flexible method for producing aluminum products. It can provide aluminum profiles of various shapes and sizes. The extruded aluminum profile 10 can be extruded by an extruder into a cross-section of a specific shape for various purposes, such as building doors and windows, automotive components, industrial parts, etc.

[0036] The production method of extruded aluminum material is as follows: first extrude the aluminum cast rod, which must be heated to soften it before extrusion, and then put the heated aluminum cast rod into the ingot barrel of the extruder. The extrusion rod is pushed by high-power oil 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 mold under the strong pressure of the extrusion pad to obtain the final product, and then the required parts are manufactured through processes such as cutting, bending, and cutting.

[0037] Secondly, with the continuous development of new energy in the automotive industry, the demand for lightweight parts in automobiles has increased. Since the extruded aluminum profile 10 can be extruded into a closed complex cross-section of a specific shape by an extruder, 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. It is currently 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 body structural parts also include sheet structural parts and box-body welded structural parts. Sheet structural parts are beam-like parts manufactured by stretching, punching, shearing and other steps on the sheet through molds, while box-body welded structural parts are closed-section beam-like parts formed by welding two sheet structural parts together.

[0039] However, the rigidity and strength of the sheet-body structural parts themselves are low and cannot meet the safety requirements of the entire vehicle. The lap welding edges between the single-piece structure and other components are short and the connection strength cannot be ensured. The lap edges of the two parts of the box-body structural parts will increase the weight of the parts and cannot meet the lightweight requirements of the entire vehicle. In addition, the complex process steps lead to high part costs.

[0040] Therefore, compared with sheet structural parts and box-welded structural parts, extruded aluminum can better meet the lightweight requirements of automotive parts and can ensure the strength and rigidity of parts. However, the parts currently manufactured using extruded aluminum profiles 10 have a flat and single surface shape, poor consistency in bending, and problems such as avoidance space and structural limitations exist when used in body structural parts.

[0041] The embodiment of the present invention adopts a method for manufacturing a body structure, using a hydraulic forming process to fill high-pressure liquid into the interior of an extruded aluminum profile 10, thereby achieving expansion to change the original outer surface shape of the extruded aluminum profile 10, and processing the required special-section parts according to the structural requirements of the body parts to solve the problems of strength, lightweight, avoidance space, structural limitations, etc. of the body parts.

[0042] The specific manufacturing method is: first use a metal circular saw to cut the straight tubular extruded aluminum profile 10. The technical requirement is a length of 1500mm, an accuracy requirement of ±1.5mm, and remove port burrs. The extruded aluminum profile 10 has at least two cavities 11, which is higher than the extruded aluminum profile with a single cavity 11, and can improve the safety of the vehicle body. In addition, according to different needs, the aluminum profile can have three or more cavities 11.

[0043] After obtaining a suitable extruded aluminum profile 10, the cut straight tube-shaped extruded aluminum profile 10 is press-bent through a press-bending process. The shape of the extruded aluminum profile 10 changes after bending, which can meet the various shapes required by different parts to achieve better assembly and application effects. In addition, by pressing and bending the extruded aluminum profile 10, the curve, radian, rounded corner and other designs of the profile can be realized to meet the functional requirements of structural strength, sound insulation, light guidance and so on.

[0044] Then, the bent tube-shaped extruded aluminum profile 10 is preformed through a cold stamping process to cut, shape or punch the metal material, providing the required metal parts for subsequent processing and assembly, and being able to efficiently produce large quantities of metal parts with high precision and consistency.

[0045] Finally, the preformed extruded aluminum profile 10 is subjected to mold filling and expansion through a hydraulic bulging process, that is, the hydraulic system 16 applies high pressure to the inner side of the extruded aluminum profile 10, causing it to undergo plastic deformation under the action of the mold. Since the inner side is subjected to high pressure, the material will expand outward and gradually fill the shape of the mold to form a body structure having at least two cavities 11 with partially recessed outer surfaces. This has high production efficiency and good processing accuracy, and can obtain precise shape and size in one forming step.

[0046] In addition, the pre-formed extruded aluminum profile 10 can be pressurized using a hydraulic forming process. 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, through the manufacturing method of the body structure, the pre-formed extruded aluminum profile 10 is filled with mold and expanded by utilizing the hydraulic forming process, so as to realize the expansion and change the outer surface shape of the original extruded aluminum profile 10. According to the structural requirements of the body parts, the aluminum alloy profile can be processed into the required special-section parts, which can occupy space and avoid space more flexibly, so that the body can use more aluminum alloy profiles, reduce costs, improve the stiffness and strength of parts, increase passive safety, and improve the degree of lightweight.

[0048] Reference Figure 1-4 As shown, the manufacturing method of filling and bulging the preformed extruded aluminum profile 10 by the hydraulic bulging process also includes: using the hydraulic bulging die 20 and the first hydraulic press to press the preformed pipe; a head 12 is sandwiched between the first hydraulic press and the preformed extruded aluminum profile 10, and the shape of the head 12 is adapted to the cavity 11 of the extruded aluminum profile 10. Among them, the first hydraulic press can drive the left and right hydraulic cylinders 13 to apply pressure to the extruded aluminum profile 10 through the hydraulic pressure generated by the hydraulic system 16, and a head 12 is sandwiched between the first hydraulic press and the preformed extruded aluminum profile 10, and the shape of the head 12 is adapted to the cavity 11 of the extruded aluminum profile 10, so that the two ends of the extruded aluminum profile 10 can be sealed, and the pressure acts on the head 12, so as to use the hydraulic pressure to realize internal bulging to change the outer surface shape of the original extruded aluminum profile 10, and process the special-shaped cross-section parts required for the body structure, so that the body uses more aluminum alloy profiles, reduces costs, and improves the degree of lightweight.

[0049] Reference Figure 4and Figure 8 As shown, the manufacturing method of filling and expanding the preformed extruded aluminum profile 10 by the hydraulic bulging process also includes: placing the preformed extruded aluminum profile 10 in a hydraulic bulging mold 20, and the first hydraulic press pushes the head 12 at both ends to seal; adjusting the position of the preformed extruded aluminum profile 10 according to the positioning of the hydraulic bulging mold 20; the upper mold 14 of the hydraulic bulging mold 20 moves downward to close with the lower mold 15, and at least one protrusion is provided on the upper mold 14 and / or the lower mold 15; the preformed pipe is filled with high-pressure liquid so that the outer surface of the preformed extruded aluminum profile 10 forms a local depression that matches the at least one protrusion.

[0050] That is, the specific operation steps of the hydraulic bulging process are: first, the preformed extruded aluminum profile 10 is placed in the hydraulic bulging die 20, the hydraulic bulging die is divided into an upper die 14 and a lower die 15, and the upper and lower dies are both provided with grooves for placing the extruded aluminum profile 10, the preformed extruded aluminum profile 10 is placed in the groove of the lower die 15, and the first hydraulic press is used to push the head 12 to seal the cavities 11 at both ends of the extruded aluminum profile 10, and then the position of the preformed extruded aluminum profile 10 is adjusted according to the positioning of the hydraulic bulging die 20, and the upper die 14 of the hydraulic bulging die 20 is moved. It 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 interior through the first hydraulic press to perform mold filling and expansion under the constraint of the die cavity 11. Due to the high pressure on the inside, the material will expand outward, and the outer wall of the extruded aluminum profile 10 will fit with the die cavity 11. According to different part requirements, at least one protrusion is provided on the upper die 14 or the lower die 15. The extruded aluminum profile 10 is squeezed by the protrusion during the continuous expansion process, and a depression is formed on the outer surface to form various required special-section parts.

[0051] During the hydraulic expansion process, the left and right hydraulic cylinders 13 push the head 12 to add force and feed material at both ends of the profile pipe, which can fill the grooves of the mold or other required detailed shapes, ensuring that the profile completely fills the shape of the mold and makes the shape of the finished product more precise.

[0052] And, the manufacturing method of filling and expanding the preformed extruded aluminum profile 10 by the 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 thickness of each part, a pressure regulating valve for adjusting the internal pressure of the cavity 11 is provided in the cavity 11. By controlling the size of the internal pressure, the shape change of the extruded aluminum profile 10 in the mold can be accurately adjusted and controlled to obtain the desired shape and size, and by adjusting the internal pressure, the extruded aluminum profile 10 can be expanded evenly in the mold to avoid uneven or too thin wall thickness, prevent material loss, and control the forming speed. The pressure value in the embodiment of the present invention is generally controlled within the range of 100-200Mpa.

[0053] Reference Figure 5-6 As shown, the manufacturing method of bending the cut straight tube-shaped extruded aluminum profile 10 by the bending process also includes: using a second hydraulic press and a bending die 30 to press the straight tube-shaped extruded aluminum profile 10. The hydraulic pressure generated by the second hydraulic press presses the straight tube-shaped extruded aluminum profile 10 into a curved tube shape, which can meet the various shapes required by different parts to achieve better assembly and application effects. In addition, by bending the extruded aluminum profile 10, the curve, radian, fillet and other designs of the profile can be realized to meet the functional requirements of structural strength, sound insulation, light guide and the like.

[0054] Reference Figure 5-6 As shown, the manufacturing method for pressing the straight tubular extruded aluminum profile 10 using a second hydraulic press and a bending die 30 also 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 a pressing block to press the head and tail ends of the straight tubular extruded aluminum profile 10 to limit its displacement to ensure the angle between the port and the center line; the upper die 14 of the bending die 30 moves downward to close with the lower die 15, so that the extruded aluminum profile 10 forms a bending arc.

[0055] That is, the specific operating steps of the press-bending process are: first, the straight tubular extruded aluminum profile 10 is placed in the press-bending mold 30, the press-bending mold 30 is divided into an upper mold 14 and a lower mold 15, and the upper and lower molds are both provided with grooves for placing the straight tubular extruded aluminum profile 10, and the straight tubular extruded aluminum profile 10 is placed in the groove of the lower mold 15, and then the position of the straight tubular extruded aluminum profile 10 is adjusted according to the positioning of the press-bending mold 30, and pressure blocks are placed at the head and tail ends of the straight tubular extruded aluminum profile 10, and the pressure blocks are used to limit the displacement of the straight tubular extruded aluminum profile 10, and then the upper mold 14 of the press-bending mold 30 is moved downward to close with the lower mold 15, and during the closing process, the straight tubular extruded aluminum profile 10 is pressed into a bent tube shape.

[0056] Among them, the upper die 14 and the lower die 15 of the bending die 30 are closed to form a bending arc, the displacement of the upper die 14 is h, the bending arc is β, and the displacement of the upper die 14 and the bending angle respectively satisfy the relationship: 0<h≤80mm, 0<β≤25°. That is, the displacement of the upper die 14 of the bending die 30 does not exceed 80mm, 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 curved tube-shaped extruded aluminum profile 10 by cold stamping process also includes: using the preforming die 40 and the third hydraulic press to press the curved tube-shaped extruded aluminum profile 10. The curved tube-shaped extruded aluminum profile 10 is cold stamped by the preforming die 40 and the third hydraulic press to form a local depression in the extruded aluminum profile 10, so that it can be smoothly placed in the hydraulic bulging die 20 for subsequent processing.

[0058] Reference Figure 7 As shown, the manufacturing method for pressing the curved tube-shaped extruded aluminum profile 10 using a preforming mold 40 and a third hydraulic press also includes: placing the curved tube-shaped extruded aluminum profile 10 into the preforming mold, and adjusting the position of the curved tube-shaped extruded aluminum profile 10 according to the positioning of the preforming mold 40; the upper mold 14 of the preforming mold 40 moves downward to close with the lower mold 15, so that the curved tube-shaped extruded aluminum profile 10 forms a partially concave shape.

[0059] That is, the specific operation steps of the cold stamping process are: first, the curved tube-shaped extruded aluminum profile 10 is placed in the preforming mold, the preforming mold 40 is divided into an upper mold 14 and a lower mold 15, and the upper and lower molds are both provided with grooves for placing the curved tube-shaped extruded aluminum profile 10, and the curved tube-shaped extruded aluminum profile 10 is placed in the groove of the lower mold 15, and then the position of the curved tube-shaped extruded aluminum profile 10 is adjusted according to the positioning of the preforming mold 40, and after the position is adjusted, the upper mold 14 of the preforming mold 40 is moved downward to close with the lower mold 15, and a local concave shape is formed on the curved tube-shaped extruded aluminum profile 10 during the closing process. Among them, the clamping force of the third hydraulic press is 150T.

[0060] According to the vehicle of the second embodiment of the present invention, the vehicle body structure component is manufactured using the vehicle body structure component manufacturing method.

[0061] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

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

Claims

1. A method for manufacturing a vehicle body structural part, characterized in that: The manufacturing method comprises: Cutting a straight tube-shaped extruded aluminum profile, wherein the extruded aluminum profile has at least two cavities; The cut straight tube-shaped extruded aluminum profile is bent by a bending process; Preforming of bent tube-shaped extruded aluminum profiles by cold stamping process; The preformed extruded aluminum profile is subjected to mold filling and expansion through a hydraulic bulging process to form a vehicle body structural component having at least two cavities and a partially concave outer surface.

2. The method for manufacturing a vehicle body structural component according to claim 1, characterized in that: The manufacturing method of performing mold filling and bulging on the preformed extruded aluminum profile by the hydraulic bulging process also includes: The preformed pipe is pressed by using a hydraulic bulging die and a first hydraulic press; A sealing head is sandwiched between the first hydraulic press and the preformed extruded aluminum profile, and the shape of the sealing head is adapted to the cavity of the extruded aluminum profile.

3. The method for manufacturing a vehicle body structural component according to claim 2, characterized in that: The manufacturing method of performing mold filling and bulging on the preformed extruded aluminum profile by the hydraulic bulging process also includes: The preformed extruded aluminum profile is placed in a hydraulic bulging die, and the first hydraulic press pushes the end caps at both ends to seal; Adjust the position of the preformed extruded aluminum profile according to the positioning of the hydraulic bulging die; The upper die of the hydraulic bulging die moves downward to close with the lower die, and at least one protrusion is provided on the upper die and / or the lower die; The preformed tube is filled with high-pressure liquid so that the outer surface of the preformed extruded aluminum profile forms a local depression that matches at least one of the protrusions.

4. The method for manufacturing a vehicle body structural component according to claim 3, characterized in that: The manufacturing method of performing mold filling and bulging on the preformed extruded aluminum profile by the hydraulic bulging process also includes: A pressure regulating valve is arranged in the cavity to control the internal pressure of the cavity.

5. The method for manufacturing a vehicle body structural component according to claim 1, characterized in that: The manufacturing method of bending the cut straight tube-shaped extruded aluminum profile by the bending process also includes: The straight tube-shaped extruded aluminum profile is pressed by a second hydraulic press and a bending die.

6. The method for manufacturing a vehicle body structural component according to claim 5, characterized in that: The manufacturing method of using the second hydraulic press and the bending die to press the straight tube-shaped extruded aluminum profile also includes: Put the straight tube-shaped extruded aluminum profile into the bending die; Adjust the position of the straight tube-shaped extruded aluminum profile according to the positioning of the bending die; The head and tail ends of the straight tube-shaped extruded aluminum profile are pressed with a pressing block to limit its displacement to ensure the angle between the port and the center line; The upper die of the press bending die moves downward to close with the lower die, so that the extruded aluminum profile forms a bending arc.

7. The method for manufacturing a vehicle body structural component according to claim 6, characterized in that: The upper die and the lower die of the bending die are closed to form a bending arc, the upper die displacement is h, the bending arc is β, and the upper die displacement and the bending angle respectively satisfy the relationship: 0<h≤80mm, 0<β≤25°.

8. The method for manufacturing a vehicle body structural component according to claim 1, characterized in that: The manufacturing method for preforming the bent tube-shaped extruded aluminum profile by cold stamping process also includes: The bent tube-shaped extruded aluminum profile is pressed using a preforming die and a third hydraulic press.

9. The method for manufacturing a vehicle body structural component according to claim 8, characterized in that: The manufacturing method of using the preforming die and the third hydraulic press to press the curved tube-shaped extruded aluminum profile also includes: The bent tube-shaped extruded aluminum profile is placed into a preforming die; Adjust the position of the bent tube-shaped extruded aluminum profile according to the positioning of the preforming die; The upper die of the preforming die moves downward to close with the lower die, so that the bent tube-shaped extruded aluminum profile is formed into a partially concave shape.

10. A vehicle, characterized in that: The vehicle body structural part is manufactured using the vehicle body structural part manufacturing method according to any one of claims 1 to 9.

Images