High-strength anti-corrosion steel plate precision component of automobile

Abstract

The invention relates to the technical field of vehicle engineering, and discloses an automobile high-strength anti-corrosion steel plate precision component which comprises a first plate and a second plate, self-positioning pre-locking structures matched with each other are arranged on the matched edges of the first plate and the second plate, reinforcing ribs are arranged in the first plate and the second plate, and the reinforcing ribs are arranged in the first plate and the second plate. An energy absorption area is arranged in the second plate, and an energy absorption assembly is arranged in the energy absorption area and used for absorbing energy in side collision or front collision. The energy absorption assembly comprises an energy absorption box, the energy absorption box is arranged in the second plate, and concave structures distributed in a gridding mode are arranged in the energy absorption box. By adopting the technical scheme that the gridding sunken structures are arranged in the energy absorption box and work cooperatively with the V-shaped fracture guide grooves, the technical effect of double accurate control over the crumple mode and the final fracture path of the energy absorption box in the collision process is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle engineering, in particular to a high-strength corrosion-resistant steel plate precision component of an automobile. BACKGROUND

[0002] The modern automobile industry is developing towards the core direction of light weight, high safety and low cost, which greatly promotes the wide application of new materials represented by hot forming ultra-high strength steel plate in vehicle body structure.

[0003] However, the excellent performance of new materials also brings severe challenges to traditional design and manufacturing processes. First, at the manufacturing level, the size consistency of the material after hot forming is poor, and the traditional assembly method relying on large and expensive special fixtures for positioning and welding has problems of high cost, low efficiency and rigid process, which cannot meet the requirements of modern production rhythm and cost control, resulting in a sharp contradiction between precise positioning and efficient production. Secondly, at the structural design level, the existing components cannot effectively balance the dual functions of rigid force transmission and flexible energy absorption. The overall rigid structure cannot effectively absorb the impact energy, which will directly transmit the huge impact deceleration to the passengers. The overall flexible structure is insufficient in strength and cannot maintain the integrity of the passenger survival space during the collision. How to realize the decoupling of different regions in a single component is the core difficulty of design. Finally, in the fine control of collision energy absorption, the traditional simple cross-section energy absorption structure has poor stability under high-speed impact and is prone to overall instability rather than ideal axial crushing. This leads to low energy absorption efficiency, high impact force peak value, and uncontrollable final failure mode, which may cause secondary injury due to accidental tearing. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a high-strength corrosion-resistant steel plate precision component of an automobile, which solves the problem of balancing between manufacturing efficiency, structural stiffness and collision energy absorption stability of high-strength steel automobile components.

[0005] To achieve the above purpose, the present application realizes the following technical scheme: a high-strength corrosion-resistant steel plate precision component of an automobile, comprising a first plate and a second plate, the mating edges of the first plate and the second plate are provided with self-positioning pre-locking structures matched with each other, the inside of the first plate and the second plate is provided with a reinforcing rib, the inside of the second plate is provided with an energy absorption zone, the inside of the energy absorption zone is provided with an energy absorption assembly for absorbing energy in side collision or frontal collision. The energy absorption assembly comprises an energy absorption box, the energy absorption box is arranged in the inside of the second plate, the inside of the energy absorption box is provided with a grid-shaped recess structure, the recess structure is arranged in an array for stably crushing the energy absorption box in collision, and a fracture guiding groove is formed in the inside of the energy absorption box.

[0006] Preferably, the cross-section of the reinforcing rib is an I-shaped structure, the reinforcing rib includes a web, the web is vertically disposed inside the first plate and the second plate, and horizontal flanges are fixedly connected to both the upper and lower sides of the web.

[0007] Preferably, the self-positioning pre-locking structure includes a dovetail tenon, which is disposed on the edge of the first plate and a dovetail groove is provided on the edge of the second plate.

[0008] Preferably, both the dovetail tenon and the dovetail groove are trapezoidal structures, and the dovetail tenon is slidably connected inside the dovetail groove.

[0009] Preferably, the fracture guide groove is a V-shaped groove disposed at the boundary of the gridded recessed structure region.

[0010] Preferably, multiple self-positioning pre-locking structures are provided along the outer side of the first plate.

[0011] Preferably, the first plate and the second plate together form a closed box-shaped cross-section structure after assembly.

[0012] Preferably, the reinforcing rib is disposed transversely through the interior of the first and second plates, and is disposed away from the energy absorption area.

[0013] Preferably, the first plate is an automotive inner panel, and the second plate is an automotive reinforcing plate.

[0014] Preferably, the first and second plates are made of hot-formed boron steel and have a hot-dip galvanized anti-corrosion layer on their surfaces.

[0015] This invention provides precision components made of high-strength, corrosion-resistant steel sheet for automobiles. It offers the following advantages: 1. The present invention adopts a technical solution in which a grid-like recessed structure and a V-shaped fracture guide groove are set inside the energy-absorbing box to work together. This achieves the technical effect of dual precise control over the collapse mode and final fracture path of the energy-absorbing box during the collision. Compared with the ordinary energy-absorbing box technology solution in the prior art that only relies on the simple cross-sectional shape for collapse, it solves the shortcomings of unstable collapse mode, large fluctuation of energy absorption peak, and easy uncontrollable tearing under severe impact.

[0016] 2. The present invention adopts a self-positioning pre-locking structure technology solution in which dovetail tenons and dovetail grooves match each other, which achieves the technical effect of rapid and accurate automatic alignment of two high-strength steel plate components before welding. Compared with the existing technology that relies on large and complex external positioning fixtures for assembly and fixation, it solves the shortcomings of low production efficiency, high manufacturing cost, poor process flexibility and difficulty in ensuring high precision consistency.

[0017] 3. The present invention adopts a technical solution that divides and avoids the stiffening ribs that provide rigidity and the energy absorption zone responsible for collapse. This achieves a clear separation between the force transmission path and the energy absorption path, so that the component can maintain the structural integrity of the critical area and allow the energy absorption zone to deform fully during a collision. Compared with the existing integral component technology solutions with single structural function or no clear functional division, this invention solves the shortcomings of the existing technology, which makes it difficult to balance rigidity and flexibility during a collision, resulting in low energy absorption efficiency or easy intrusion into the occupant survival space. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the reinforcing ribs of the present invention; Figure 3 This is a schematic diagram of the self-positioning pre-locking structure of the present invention; Figure 4 This is a schematic diagram of the energy absorption region of the present invention; Figure 5 This is a schematic diagram of the energy absorption component of the present invention.

[0019] Among them, 1. First plate; 2. Second plate; 3. Reinforcing rib; 31. Web plate; 32. Horizontal flange; 4. Energy absorption area; 5. Self-positioning pre-locking structure; 51. Dovetail tenon; 52. Dovetail groove; 6. Energy absorption component; 61. Recessed structure; 62. Fracture guide groove; 63. Energy absorption box. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see the appendix Figure 1 -Appendix Figure 5This invention provides a precision component made of high-strength anti-corrosion steel sheet for automobiles, including a first plate 1 and a second plate 2. The first plate 1 is an inner panel of an automobile, and the second plate 2 is a reinforcing plate of an automobile. Both the first plate 1 and the second plate 2 are made of hot-formed boron steel and have a hot-dip galvanized anti-corrosion layer on their surfaces. Matching self-positioning pre-locking structures 5 are provided on the mating edges of the first plate 1 and the second plate 2. Multiple self-positioning pre-locking structures 5 are provided along the outer side of the first plate 1. Each self-positioning pre-locking structure 5 includes a dovetail tenon 51, which is located on the edge of the first plate 1. A dovetail groove 52 is provided on the edge of the second plate 2. Both the dovetail tenon 51 and the dovetail groove 52 are trapezoidal structures. The dovetail tenon 51 is slidably connected inside the dovetail groove 52. Reinforcing ribs 3 are provided inside the first plate 1 and the second plate 2. The cross-section of the reinforcing ribs 3 is I-shaped, and each reinforcing rib 3 includes a web 31. Vertically disposed inside the first plate 1 and the second plate 2, the web 31 is fixedly connected to the upper and lower sides with horizontal flanges 32. The reinforcing ribs 3 are transversely disposed inside the first plate 1 and the second plate 2, avoiding the energy absorption zone 4. The energy absorption zone 4 is disposed inside the second plate 2, and the energy absorption zone 4 is disposed inside the energy absorption component 6, which is used to absorb energy in side collisions or frontal collisions. The energy absorption component 6 includes an energy absorption box 63, which is disposed inside the second plate 2. The energy absorption box 63 is disposed inside the energy absorption box 63 with a grid-distributed recessed structure 61 arranged in an array, which is used to stabilize the crushed energy absorption box 63 in a collision. The energy absorption box 63 is provided with a fracture guide groove 62, which is a V-shaped groove set at the boundary of the grid-distributed recessed structure 61 area. After the first plate 1 and the second plate 2 are assembled, they together form a closed box-shaped cross-section structure.

[0022] Specifically, during the manufacturing and assembly stage, multiple self-positioning pre-locking structures 5 are set on the mating edges of the first plate 1 and the second plate 2. Utilizing the sliding engagement of the dovetail tenon 51 and the dovetail groove 52, high-precision alignment is achieved without complex external fixtures, significantly improving assembly efficiency and ensuring consistency in subsequent connection processes. After assembly, the first plate 1 and the second plate 2 together form a closed box-shaped cross-section structure 7, maximizing the structural torsional stiffness. The internal I-shaped cross-section reinforcing ribs 3 provide excellent bending resistance with optimal material distribution, achieving high structural stability of the component under dynamic loads. During the load-bearing phase of daily vehicle operation, the component made of hot-formed boron steel with a hot-dip galvanized anti-corrosion layer 10 serves as both the inner panel 1 and the reinforcing plate 9, bearing various loads during vehicle operation. This achieves the design goal of lightweighting while meeting ultra-high strength requirements, and ensures the reliability of the component throughout its entire life cycle through long-term anti-corrosion. During the energy absorption phase of a collision, the component's collision safety mechanism is activated: the robust reinforcing ribs 3 are designed to avoid the dedicated energy absorption zone 4, effectively separating the force transmission path from the energy absorption path, ensuring that the energy absorption zone can undergo sufficient and unimpeded crumple deformation. The impact energy is mainly absorbed by the energy absorption box 63 in the energy absorption component 6. Its internal grid-like recessed structure 61 serves as a crumple induction feature, guiding the box to undergo stable and progressive wrinkling deformation, thereby dissipating kinetic energy over a longer stroke. Under more severe impacts, the pre-set V-shaped fracture guide groove 62 acts as a stress concentration point, guiding the structure to fracture along a predetermined path, effectively preventing uncontrollable tearing and fragment intrusion, ultimately achieving efficient and controllable collision energy absorption.

[0023] Example 1: A precision component applied to the B-pillar reinforcement of an automobile. After assembly, the component is a curved elongated strip conforming to the contour of the vehicle body side panel. It is composed of a first plate 1 serving as the inner panel of the B-pillar and a second plate 2 serving as the main reinforcement plate of the B-pillar. Both plates are made of hot-formed boron steel and have a hot-dip galvanized anti-corrosion layer on their surface to ensure that the component has high strength, lightweight, and long-term anti-corrosion performance. Multiple self-positioning pre-locking structures 5 are provided along the mating edges of the first plate 1 and the second plate 2. Specifically, this structure consists of a dovetail tenon 51 integrally formed on the edge of the first plate 1 and a dovetail groove 52 opened on the edge of the second plate 2. During assembly, the two plates can be quickly self-positioned and pre-locked by sliding the dovetail tenon 51 into the dovetail groove 52, ensuring extremely high assembly accuracy without the need for large external clamps. They are then permanently fixed using methods such as laser welding, ultimately forming a closed box-shaped cross-section structure. To effectively protect the passenger compartment in a side impact, this component incorporates a reinforcing rib 3, a highly efficient I-beam structure consisting of a vertical web 31 and horizontal flanges 32 connecting its upper and lower ends. This reinforcing rib 3 runs longitudinally through the upper half and rear edge of the B-pillar, providing excellent bending stiffness to resist collision intrusion. Simultaneously, the path design of the reinforcing rib 3 cleverly avoids the energy absorption zone 4 in the lower part of the B-pillar, effectively separating the force transmission path from the energy absorption path. This energy absorption zone 4 integrates an energy absorption component 6, used to absorb energy through stable crumpling during a side impact.

[0024] Example 2: A precision component applied to the front longitudinal beam of an automobile. The component consists of a first plate 1, which serves as the inner plate of the longitudinal beam, and a second plate 2, which serves as the reinforcing plate of the longitudinal beam. Its assembly method is the same as that in Example 1. It is also precision assembled using a self-positioning pre-locking structure 5 composed of dovetail tenons 51 and dovetail grooves 52 to form a closed box-shaped cross section. The front section of this front longitudinal beam component is specially designed as an energy absorption zone 4. Its core is an energy-absorbing box 63 integrally stamped from the second plate 2. The main function of the energy-absorbing box 63 is to perform stable and efficient energy absorption when the vehicle is involved in a frontal collision. To achieve this function, a grid-like recessed structure 61 arranged in an array is provided on the inner wall of the energy-absorbing box 63. These recessed structures 61, as crumple-inducing features, can guide the energy-absorbing box 63 to undergo stable, gradual accordion-like axial crushing during a frontal collision, thereby continuously absorbing collision energy over a longer travel distance and effectively reducing the peak impact force. Furthermore, at the boundary of the gridded recessed structure 61 area, a V-shaped fracture guide groove 62 is pre-set. This guide groove 62 serves as a stress concentration point, guiding the structure to fracture along this pre-set path under severe impacts exceeding design limits, thereby avoiding uncontrollable tearing and intrusion of structural components into the engine compartment or passenger compartment. This achieves full controllability from initial crumple to final failure. At the same time, the rear half of the longitudinal beam member near the firewall is provided with an I-shaped reinforcing rib 3 to transfer unabsorbed residual energy and maintain the integrity of the cockpit structure.

[0025] Working principle: When using this device, during manufacturing and assembly, multiple self-positioning pre-locking structures 5 are set on the mating edges of the first plate 1 and the second plate 2. The sliding fit between the dovetail tenon 51 and the dovetail groove 52 is used to achieve rapid self-positioning and pre-locking of the two plates. After assembly, the two plates together form a high-strength closed box-shaped cross-section structure. The I-shaped cross-section reinforcing ribs 3 set inside further improve the overall rigidity and bending resistance. During daily vehicle operation, the component made of hot-formed boron steel with a hot-dip galvanized anti-corrosion layer 10 serves as the load-bearing component 9 for both the inner panel 1 and the reinforcing plate 2. In the event of a collision, the robust reinforcing ribs 3 are designed to avoid the dedicated energy absorption zone 4, ensuring that the energy absorption function is not interfered with. The impact energy is absorbed by the energy absorption box 63 in the energy absorption component 6. The grid-like recessed structure 61 inside guides the box to undergo stable and orderly crushing. Under severe impact, the V-shaped fracture guide groove 62 ensures that the structure fails along a preset path, thereby efficiently and controllably absorbing the collision energy.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art 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 appended claims and their equivalents.

Claims

1. A precision component made of high-strength anti-corrosion steel sheet for automobiles, comprising a first plate (1) and a second plate (2), characterized in that: The first plate (1) and the second plate (2) are provided with mutually matching self-positioning pre-locking structures (5) on their mating edges. The first plate (1) and the second plate (2) are provided with reinforcing ribs (3). The second plate (2) is provided with an energy absorption area (4). The energy absorption area (4) is provided with an energy absorption component (6) for absorbing energy in side collisions or frontal collisions. The energy absorption component (6) includes an energy absorption box (63), which is disposed inside the second plate (2). The energy absorption box (63) has a grid-distributed recessed structure (61) inside, which is arranged in an array to stabilize the crushed energy absorption box (63) in a collision. The energy absorption box (63) has a fracture guide groove (62) inside.

2. The precision component made of high-strength anti-corrosion steel sheet for automobiles according to claim 1, characterized in that, The cross-section of the reinforcing rib (3) is an I-shaped structure. The reinforcing rib (3) includes a web (31). The web (31) is vertically arranged inside the first plate (1) and the second plate (2). Horizontal flanges (32) are fixedly connected to both the upper and lower sides of the web (31).

3. The precision component made of high-strength anti-corrosion steel sheet for automobiles according to claim 1, characterized in that, The self-positioning pre-locking structure (5) includes a dovetail tenon (51), which is provided on the edge of the first plate (1), and a dovetail groove (52) is provided on the edge of the second plate (2).

4. The precision component made of high-strength anti-corrosion steel sheet for automobiles according to claim 3, characterized in that, Both the dovetail tenon (51) and the dovetail groove (52) are trapezoidal structures, and the dovetail tenon (51) is slidably connected inside the dovetail groove (52).

5. The precision component made of high-strength anti-corrosion steel sheet for automobiles according to claim 1, characterized in that, The fracture guide groove (62) is a V-shaped groove set at the boundary of the gridded recessed structure (61) region.

6. The precision component made of high-strength anti-corrosion steel sheet for automobiles according to claim 1, characterized in that, The self-positioning pre-locking structure (5) is provided in multiple locations along the outer side of the first plate (1).

7. The precision component made of high-strength anti-corrosion steel sheet for automobiles according to claim 1, characterized in that, The first plate (1) and the second plate (2) together form a closed box-shaped cross-section structure after assembly.

8. The precision component made of high-strength anti-corrosion steel sheet for automobiles according to claim 1, characterized in that, The reinforcing rib (3) is transversely disposed inside the first plate (1) and the second plate (2), and is disposed away from the energy absorption area (4).

9. The precision component made of high-strength anti-corrosion steel sheet for automobiles according to claim 1, characterized in that, The first plate (1) is an automotive inner panel, and the second plate (2) is an automotive reinforcing plate.

10. The precision component of high-strength anti-corrosion steel plate for automobiles according to claim 1, characterized in that, The first plate (1) and the second plate (2) are made of hot-formed boron steel and have a hot-dip galvanized anti-corrosion layer on their surface.

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