Vehicle body side wall double-door-ring structure
By combining laser assembly and local overlapping spot welding in the side-circuit double door ring structure of the vehicle body, the problem of insufficient laser assembly strength in the prior art is solved, and the local strength is improved and the car body weight reduction effect is achieved.
Patent Information
- Application Number
- CN202420550524.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-03-21
AI Technical Summary
When facing the new version of the side-circuit double door ring structure, the laser welding is insufficient in strength, and reinforcement parts need to be added to achieve the same strength, and there are shortcomings in flexibility response.
The combination of laser welding and local overlapping spot welding is adopted to form an integral piece through laser welding, and local overlapping spot welding areas are added to key areas to optimize structural overlaps and enhance local strength.
It realizes that the local strength of the double door ring is improved without adding additional reinforcement, meets the requirements of the new version of the side bump regulations, and reduces the welding process of single-pieces, with small rebound and weight loss on the body.
Smart Images
Figure CN222591591U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a vehicle body side enclosure double door ring structure, belonging to the technical field of automobile manufacturing. Background Art
[0002] According to statistics of road traffic accidents, side collision accidents between vehicles account for more than 40% of the total number of collision accidents. Therefore, a higher standard of movable side collision barriers is proposed in the 2025 C-NCAP. The 2025 version of the side collision barrier vehicle has been increased from the original 1400kg, 50km / h to 1700kg, 60km / h, and its collision energy has been increased by 75%. The deformation area of the new barrier vehicle has been increased in height, width and thickness. In this regard, the door structure will bear a larger proportion of the load.
[0003] The existing double door ring structure of the side outer panel is formed by hot stamping one piece after laser welding one or more thick sheets to obtain an integrated sheet. The double door ring made in this way has no overlapping area, which can reduce the weight, and the good integrity of the parts is conducive to collision force transmission. However, compared with the traditional loose parts overlap door ring, the strength of the laser welded area without overlapping will be reduced. In order to cope with the new version of the side collision regulations, it is necessary to add reinforcements to achieve the same strength, which increases the number of products and production processes.
[0004] In addition, the double door rings made by laser welding are not conducive to flexible response to collisions in the case of equal-thickness sheets. Although multiple sections of sheets with different thicknesses can be welded, the number of welded sections of door rings is generally controlled at 6-7 sections in consideration of the welding cost; in this case, the use of flexible rolling technology should be considered. In addition, due to the introduction of the new version of the side collision regulations, the size of the side collision barrier has increased, resulting in the original C-pillar structure no longer meeting the side collision requirements of the entire vehicle, and enhanced design considerations are required. Utility Model Content
[0005] In order to overcome the drawbacks of the prior art, the utility model provides a double door ring structure for the vehicle body side, which adopts laser welding and local overlap, and then is formed by integrated hot stamping. On the basis of welding, local overlapping overlap spot welding areas are added, the structural overlap is optimized, the structural weak areas are avoided, and the local strength is increased without the addition of additional reinforcement parts.
[0006] The technical solution adopted by the utility model to solve its technical problems is:
[0007] A double door ring structure for a vehicle body side, the double door ring structure comprises a single door ring sub-assembly and a C-pillar sub-assembly, the single door ring sub-assembly comprises a middle section of an A-pillar upper side beam, a lower section of an A-pillar upper side beam, an A-pillar lower reinforcement plate, a door sill front reinforcement plate and a door sill rear reinforcement plate, which are sequentially connected to form a first door ring, the C-pillar sub-assembly comprises an upper section of an A-pillar upper side beam and a C-pillar lower reinforcement plate, the middle section of an A-pillar upper side beam, an upper section of an A-pillar upper side beam, a C-pillar lower reinforcement plate and a door sill rear reinforcement plate are sequentially connected to form a second door ring, at least one of the connection points of all component sheets is a lap spot welding connection, and the rest are laser welding connections, and the connected integrated sheet is then formed by hot stamping.
[0008] The above-mentioned double door ring structure of the body side, the middle section of the A-pillar upper side beam, the lower section of the A-pillar upper side beam, the A-pillar lower reinforcement plate, the door sill front reinforcement plate and the door sill rear reinforcement plate are connected in sequence by laser welding to form a first door ring, the upper section of the A-pillar upper side beam and the C-pillar lower reinforcement plate are connected as a whole by laser welding, the upper section of the A-pillar upper side beam and the middle section of the A-pillar upper side beam are connected by overlapping spot welding, and the C-pillar lower reinforcement plate and the door sill rear reinforcement plate are connected by overlapping spot welding.
[0009] The overlapping spot welding positions of the above-mentioned body side double door ring structure also include one or more of the connection between the lower reinforcement plate of the A-pillar and the front reinforcement plate of the door sill, the connection between the middle section of the upper side beam of the A-pillar and the rear reinforcement plate of the door sill, and the connection between the upper section of the upper side beam of the A-pillar (and the lower reinforcement plate of the C-pillar).
[0010] The above-mentioned body side double door ring structure has an overlap width L at the overlap spot weld of 14~50mm, and 1~2 rows of spot welds are arranged. The thickness h1 of the material sheet of the upper section of the A-pillar upper side beam is 1.0mm≤h1≤2.2mm, and the thickness h2 of the material sheet of the middle section of the A-pillar upper side beam is: 1.4mm≤h2≤2.4mm; the thickness h3 of the material sheet of the reinforcing plate behind the door sill is 1.4mm≤h3≤2.0mm, and the thickness h4 of the material sheet of the lower reinforcing plate of the C-pillar is 1.0mm≤h4≤2.2mm.
[0011] In the above-mentioned double door ring structure of the body side, the ratio of the height a of the connection between the upper section of the A-pillar upper side beam and the lower reinforcement plate of the C-pillar from the lower edge of the door sill to the height b of the entire second door ring is: 1 / 3≤a / b≤3 / 4.
[0012] The above-mentioned body side double door ring structure, the upper section of the A-pillar upper side beam and the C-pillar lower reinforcement plate are both set as patch plate structures, the material thickness h5 of the patch plate is: 1.0mm≤h5≤2.0mm, the Z-direction height is 300~900mm, and the patch plate is spot welded with the outer panel to form an integral sheet.
[0013] In the above-mentioned body side double door ring structure, the C-pillar lower reinforcement plate adopts a variable thickness rolling process, the material thickness T1 or T2 of the reinforced part is 1.4-2.0mm, and the material thickness T3 of the energy absorption part is 1.0-1.6mm; transition zones are set between sheets of different thicknesses, the width c of the transition zone C between T1 and T2 is ≥ (T2-T1) × 100mm, and the width d of the transition zone D between T2 and T3 is ≥ (T2-T1) × 100mm.
[0014] The beneficial effect of the utility model is that after the different parts of the body side double door ring structure of the utility model are connected by laser welding and overlap spot welding to form an integral sheet, they are heated and transferred to a press for integrated hot stamping to finally obtain a body side double door ring product. This product has small rebound, reduces the welding process of a single piece, and achieves body weight reduction on the basis of meeting the performance of the whole vehicle side collision.
[0015] The utility model increases the local overlapping lap spot welding area, and the laser welding and the spot welding lap are flexibly matched, the structural lap is optimized, the structural weak area is avoided, the local strength is increased, and there is no need to add additional reinforcement parts.
[0016] The C-pillar sub-assembly adopts local reinforcement patch plate and TRB technology to achieve local reinforcement of the C-pillar and better cope with the new version of vehicle side impact regulations. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The utility model will be further described below in conjunction with the accompanying drawings.
[0018] Figure 1 This is a schematic diagram of the explosion structure of the double door knocker of the utility model;
[0019] Figure 2 It is a schematic diagram of the lap spot welding structure of the single door ring sub-assembly and the C-pillar sub-assembly;
[0020] Figure 3 for Figure 2 Enlarged structural diagram of the middle lap spot weld A;
[0021] Figure 4 for Figure 2 The enlarged structural diagram of the middle lap spot weld B;
[0022] Figure 5 This is a schematic diagram of the patch plate structure on the C-pillar lower reinforcement plate;
[0023] Figure 6 for Figure 1 Schematic diagram of the cross-sectional structure of the patch plate at CC in the middle.
[0024] In the figure: 1. Single door ring sub-assembly; 1-1. Middle section of A-pillar upper side beam; 1-2. Lower section of A-pillar upper side beam; 1-3. A-pillar lower reinforcement plate; 1-4. Door sill front reinforcement plate; 1-5. Door sill rear reinforcement plate; 2. C-pillar sub-assembly; 2-1. Upper section of A-pillar upper side beam; 2-2. C-pillar lower reinforcement plate; 2-3. Patch plate; 3. First door ring; 4. Second door ring. DETAILED DESCRIPTION
[0025] The utility model will be further described below in conjunction with the accompanying drawings.
[0026] See also Figure 1 and Figure 2 The utility model provides a double door ring structure for the vehicle body side, the double door ring structure comprises a single door ring sub-assembly 1 and a C-pillar sub-assembly 2, the single door ring sub-assembly 1 comprises an A-pillar upper side beam middle section 1-1, an A-pillar upper side beam lower section 1-2, an A-pillar lower reinforcement plate 1-3, a threshold front reinforcement plate 1-4 and a threshold rear reinforcement plate 1-5, which are sequentially connected to form a first door ring 3, the C-pillar sub-assembly comprises an A-pillar upper side beam upper section 2-1 and a C-pillar lower reinforcement plate 2-2, the A-pillar upper side beam middle section 1-1, the A-pillar upper side beam The upper section 2-1, the lower reinforcement plate 2-2 of the C-pillar and the rear reinforcement plate 1-5 of the door sill are connected in sequence to form the second door ring 4. All component sheets are connected by local overlap spot welding and laser welding. Specifically, at least one of the connection points of all component sheets is connected by overlap spot welding, and the remaining connections are laser welded. After the components are laser welded, the positions that require overlap spot welding are overlap spot welded to form an integrated sheet, and then the whole is placed in a mold for hot stamping to obtain the final side double door ring product.
[0027] See also Figures 2 to 4 The A-pillar upper side beam middle section 1-1, the A-pillar upper side beam lower section 1-2, the A-pillar lower reinforcement plate 1-3, the door sill front reinforcement plate 1-4 and the door sill rear reinforcement plate 1-5 in the single door ring sub-assembly 1 are laser welded in sequence to form the first door ring. According to actual needs, the single door ring sub-assembly components can select 4-6 different thicknesses (thickness range 1.2-3.0mm) and different materials (1500MPa / 2000MPa / 500MPa, etc.) for laser welding to form an integrated sheet. Similarly, the C-pillar sub-assembly 2 can select 2-3 sections of materials with a thickness of 1.0-2.5mm and different strengths for welding to form an integrated sheet. The sheets of the single door ring sub-assembly 1 and the C-pillar sub-assembly 2 are laser welded and then connected by overlap spot welding, such as Figure 2 In the figure, the lap spot welds at A and B are: Figure 3 and Figure 4The overlap width L of the two overlapping spot welds is 14~50mm, and 1~2 rows of spot welds are arranged. The thickness h1 of the material sheet of the upper section 2-1 of the A-pillar upper side beam is 1.0mm≤h1≤2.2mm, and the thickness h2 of the material sheet of the middle section 1-1 of the A-pillar upper side beam is: 1.4mm≤h2≤2.4mm; the thickness h3 of the material sheet of the door sill rear reinforcement plate 1-5 is 1.4mm≤h3≤2.0mm, and the thickness h4 of the material sheet of the C-pillar lower reinforcement plate 2-2 is 1.0mm≤h4≤2.2mm.
[0028] In the side impact test, the collision load of the barrier trolley is mainly borne by the front and rear doors and B-pillar of the test vehicle. Considering the 2025 version of C-NCAP side impact conditions and the increase in barrier size, the load on the C-pillar and the door sill will increase, and the size changes of the double door rings matched with different models can also be selected at different positions to change the laser welding to overlap spot welding to increase strength and improve bending resistance. Specifically: the A-pillar lower reinforcement plate 1-3 and the door sill front reinforcement plate 1-4 are connected by overlap spot welding, or the A-pillar upper side beam middle section 1-1 and the door sill rear reinforcement plate 1-5 are connected by overlap spot welding, or the A-pillar upper side beam upper section 2-1 and the C-pillar lower reinforcement plate 2-2 are connected by overlap spot welding. After at least one of the three places is overlapped and spot welded, the strength of the double door rings is increased together with the overlap spot welding at A and B. This kind of overlap is completed by spot welding process at the sheet stage, and then formed in one piece, which reduces cost and improves strength compared with traditional overlap welded door rings. The three overlap widths and spot welding conditions here are the same as the overlap spot welding parameters at A and B mentioned above.
[0029] In order to cope with the new version of the side collision, the strength of the C-pillar needs to be improved to ensure that it is not bent at the laser welded seam as much as possible during a collision. The ratio of the height a of the connection between the upper section 2-1 of the A-pillar upper side beam and the lower reinforcement plate 2-2 of the C-pillar from the lower edge of the door sill to the height b of the entire second door ring 4 is: 1 / 3≤a / b≤3 / 4 (see Figure 2 ).
[0030] In addition, see Figure 5 and Figure 6 The upper section 2-1 of the A-pillar upper side beam and the lower reinforcement plate 2-2 of the C-pillar are both configured as patch plate structures. The material thickness h5 of the patch plate 2-3 is: 1.0mm≤h5≤2.0mm, and the Z-direction height is 300~900mm. The patch plate and the outer panel are spot welded to form an integral sheet.
[0031] Considering the side impact strength, the thickness of the C-pillar is considered as a variable thickness process, and the thickness of the part that needs to be strengthened can be designed to be larger. Figure 2The material thickness of the reinforced part T1 or T2 on the C-pillar lower reinforcement plate 2-2 is 1.4-2.0mm, and the material thickness T3 of the energy absorption part is 1.0-1.6mm; transition zones are set between sheets of different thicknesses, and the width of the transition zone C between T1 and T2 is c≥(T2-T1)×100mm, and the width of the transition zone D between T2 and T3 is d≥(T2-T1)×100mm. By reasonably allocating the material thickness, the lightweight effect can be maximized while meeting regulatory requirements.
Claims
1. A double door ring structure for a vehicle body side, characterized in that: The double door ring structure comprises a single door ring sub-assembly (1) and a C-pillar sub-assembly (2). The single door ring sub-assembly (1) comprises an A-pillar upper side beam middle section (1-1), an A-pillar upper side beam lower section (1-2), an A-pillar lower reinforcement plate (1-3), a door sill front reinforcement plate (1-4) and a door sill rear reinforcement plate (1-5), which are sequentially connected to form a first door ring (3). The C-pillar sub-assembly comprises an A-pillar upper side beam upper section (2-1) and a C-pillar lower reinforcement plate (2-2). The A-pillar upper side beam middle section (1-1), the A-pillar upper side beam upper section (2-1), the C-pillar lower reinforcement plate (2-2) and the door sill rear reinforcement plate (1-5) are sequentially connected to form a second door ring (4). At least one of the connection points of all component sheets is a lap spot welding connection, and the rest are laser tailored welding connections. The connected integrated sheet is then formed by hot stamping.
2. The vehicle body side double door ring structure according to claim 1, characterized in that: The middle section of the A-pillar upper side beam (1-1), the lower section of the A-pillar upper side beam (1-2), the lower reinforcement plate of the A-pillar (1-3), the front reinforcement plate of the door sill (1-4) and the rear reinforcement plate of the door sill (1-5) are sequentially connected by laser welding to form a first door ring (3); the upper section of the A-pillar upper side beam (2-1) and the lower reinforcement plate of the C-pillar (2-2) are connected as a whole by laser welding; the upper section of the A-pillar upper side beam (2-1) and the middle section of the A-pillar upper side beam (1-1) are connected by overlapping spot welding; and the lower reinforcement plate of the C-pillar (2-2) and the rear reinforcement plate of the door sill (1-5) are connected by overlapping spot welding.
3. The vehicle body side double door ring structure according to claim 2, characterized in that: The locations of the overlapping spot welding also include one or more of the connection between the A-pillar lower reinforcement plate (1-3) and the door sill front reinforcement plate (1-4), the connection between the A-pillar upper side beam middle section (1-1) and the door sill rear reinforcement plate (1-5), and the connection between the A-pillar upper side beam upper section (2-1) and the C-pillar lower reinforcement plate (2-2).
4. The vehicle body side double door ring structure according to any one of claims 1 to 3, characterized in that: The overlap width L of the overlap spot weld is 14-50 mm, and 1-2 rows of spot welds are arranged. The sheet thickness h1 of the upper section (2-1) of the A-pillar upper side beam is 1.0 mm ≤ h1 ≤ 2.2 mm, and the sheet thickness h2 of the middle section (1-1) of the A-pillar upper side beam is 1.4 mm ≤ h2 ≤ 2.4 mm. The sheet thickness h3 of the sheet of the door sill rear reinforcement plate (1-5) is 1.4 mm ≤ h3 ≤ 2.0 mm, and the sheet thickness h4 of the C-pillar lower reinforcement plate (2-2) is 1.0 mm ≤ h4 ≤ 2.2 mm.
5. The vehicle body side double door ring structure according to claim 4, characterized in that: The ratio of the height a of the connection between the upper section of the A-pillar upper side beam (2-1) and the C-pillar lower reinforcement plate (2-2) from the lower edge of the door sill to the height b of the entire second door ring (4) is: 1 / 3≤a / b≤3 / 4.
6. The vehicle body side double door ring structure according to claim 5, characterized in that: The upper section of the A-pillar upper side beam (2-1) and the C-pillar lower reinforcement plate (2-2) are both configured as patch plate structures, the material thickness h5 of the patch plate (2-3) is: 1.0 mm ≤ h5 ≤ 2.0 mm, the Z-direction height is 300-900 mm, and the patch plate is spot welded with the outer plate to form an integral sheet.
7. The vehicle body side double door ring structure according to claim 5 or 6, characterized in that: The C-pillar lower reinforcement plate (2-2) is produced by a variable thickness rolling process, the material thickness T1 or T2 of the reinforced part is 1.4-2.0 mm, and the material thickness T3 of the energy absorption part is 1.0-1.6 mm; transition zones are provided between the sheets of different thicknesses, the width c of the transition zone C between T1 and T2 is ≥ (T2-T1)×100 mm, and the width d of the transition zone D between T2 and T3 is ≥ (T2-T1)×100 mm.