A side outer panel double door ring reinforcement structure and its manufacturing method and side outer panel reinforcement assembly

Abstract

The present invention relates to a side panel outer panel double door ring reinforcement structure, comprising a side panel outer panel double door ring assembly, which is formed by hot stamping an integral plate body having two closed door rings; the side panel outer panel double door ring assembly comprises an A-pillar portion, a B-pillar portion, a C-pillar portion, a door sill portion, a first upper side rail portion, and a second upper side rail portion; the A-pillar portion, the first upper side rail portion, the B-pillar portion, and the door sill portion form a first closed door ring, and the C-pillar portion, the second upper side rail portion, the B-pillar portion, and the door sill portion form a second closed door ring. A manufacturing method comprises splicing various blanks into an integral plate body, and then hot stamping the plate body. A side panel outer panel reinforcement assembly comprises a side panel outer panel double door ring reinforcement structure. The present invention integrates the blanks and plates as a whole, and then hot stamps the plates as a whole to form a side panel outer panel double door ring reinforcement structure having front and rear door rings. The components have higher continuity and integrity, better strength and rigidity, and are free of hidden dangers such as welding defects and welding failures. There is no overlap of weld points, and the side panel outer panel can be reduced in weight.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile body structures, and in particular to a side outer panel double door ring reinforcement structure and a manufacturing method thereof, and a side outer panel reinforcement assembly. Background Art

[0002] With the continuous development of the automotive industry, automotive products are gradually moving towards safety, energy conservation, environmental protection, and rapid iteration. The traditional body design method of stamping individual parts and then welding them together has seriously restricted automobile development. Integrated one-piece hot forming technology for automotive parts can effectively balance vehicle collision safety performance and vehicle lightweighting, while significantly reducing tooling and manpower input, improving body precision, shortening development cycles, and facilitating rapid product iteration. It is currently a key direction in the development of body technology.

[0003] The traditional side panel reinforcement ring structure consists of a single front door reinforcement ring structure, consisting of a welded subassembly of the A-pillar reinforcement plate, a welded subassembly of the upper side sill plate, a welded subassembly of the B-pillar reinforcement plate, and a welded subassembly of the sill outer panel. These subassemblies are then welded together using a fixture to create a single front door reinforcement ring structure for the rear door opening. This single front door reinforcement ring is then joined to the rear side panel welding assembly. Because the side panel and C-pillar inner panel obstruct the welding clamp space, welding the C-pillar upper reinforcement plate to the upper side sill reinforcement plate is impossible. To prevent unwanted noise, a clearance fit is used between the overlapping surfaces of the C-pillar upper reinforcement plate and the upper side sill reinforcement plate, resulting in a weak upper joint and an incomplete rear door reinforcement ring structure. In side impacts, failure and fracture of this joint often compromise the safety performance of the entire vehicle. The traditional rear side panel welding subassembly consists of welded upper, middle, and lower sections at the rear door opening, splitting the rear door opening into multiple, spliced ​​pieces. This lacks integrity, impacting the overall rigidity of the rear door opening and the precision of the door stop.

[0004] Generally speaking, the traditional side panel reinforcement ring structure consists of formed individual pieces welded together to form an assembly structure, with reinforcement plates placed on each piece. This results in a large number of individual pieces, multiple individual forming and welding steps, and high labor costs. Furthermore, due to the use of spot welding, overlapping surfaces must be reserved between the individual pieces, occupying a large area and increasing material consumption and product weight. Furthermore, the welded joints between the individual pieces present the risk of welding defects and weld failure, which can weaken the overall strength of the side panel. During a collision, especially an offset collision, the door sill area is prone to bending failure due to weld failure from the weld overlap, and the upper side rail area is discontinuous, affecting the rigidity of the side panel. Summary of the Invention

[0005] One of the purposes of the present invention is to provide a double-door ring reinforcement structure for a side outer panel, so as to solve the problems in the prior art of excessive number of single pieces in the molding of the side outer panel structure, hidden dangers of welding defects and welding failures at the welding parts, and insufficient overall strength and rigidity; the second purpose is to provide a manufacturing method for the double-door ring reinforcement structure for a side outer panel; and the third purpose is to provide a side outer panel reinforcement assembly.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, a side panel outer panel double door ring reinforcement structure is provided, the key of which is: comprising a side panel outer panel double door ring assembly, wherein the side panel outer panel double door ring assembly is formed by hot stamping an integral plate body having two closed door rings; the side panel outer panel double door ring assembly comprises:

[0008] An A-pillar portion, including an A-pillar upper end portion and an A-pillar lower end portion;

[0009] A B-pillar portion, including a B-pillar upper end portion and a B-pillar lower end portion;

[0010] A C-pillar portion, including a C-pillar upper end portion and a C-pillar lower end portion;

[0011] A rocker portion is located between the lower end of the A-pillar and the lower end of the C-pillar, and the lower end of the B-pillar is connected to the middle portion of the rocker portion;

[0012] a first roof rail portion, located between an upper end portion of the B-pillar and an upper end portion of the A-pillar;

[0013] A second roof rail portion, located between an upper end portion of the B-pillar and an upper end portion of the C-pillar;

[0014] The A-pillar portion, the first roof side rail portion, the B-pillar portion and the rocker portion form a first closed door ring, and the C-pillar portion, the second roof side rail portion, the B-pillar portion and the rocker portion form a second closed door ring.

[0015] Based on the first aspect, in some embodiments, the tip of the corner where the A-pillar portion connects to the rocker portion is processed into a C-angle to form a gently transitioning slope.

[0016] Based on the first aspect, in some embodiments, in the first closed door ring, the connection between the A-pillar portion and the threshold portion forms a first corner, and the connection between the B-pillar portion and the threshold portion forms a second corner, the inner fillet radius R1 of the first corner is greater than or equal to 2.5 times the depth H1 of the hot stamping at the first corner, and the inner fillet radius R2 of the second corner is greater than or equal to 2.5 times the depth H2 of the hot stamping at the second corner.

[0017] Based on the first aspect, in some embodiments, a secondary step surface for reducing the forming depth is provided at the first corner; and / or a secondary step surface for reducing the forming depth is provided at the second corner.

[0018] Based on the first aspect, in some embodiments, in the second closed door ring, the connection between the C-pillar portion and the threshold portion forms a third corner, and the connection between the B-pillar portion and the threshold portion forms a fourth corner. The inner fillet radius R3 of the third corner is greater than or equal to 2.5 times the depth H3 of the hot stamping at the third corner, and the inner fillet radius R4 of the fourth corner is greater than or equal to 2.5 times the depth H4 of the hot stamping at the fourth corner.

[0019] Based on the first aspect, in some embodiments, a secondary step surface for reducing the forming depth is provided at the third corner; and / or a secondary step surface for reducing the forming depth is provided at the fourth corner.

[0020] Based on the first aspect, in some embodiments, a corner radius R5 of a cross section formed by hot stamping of the rocker portion is ≥6 mm; and / or a corner radius R6 of a cross section formed by hot stamping of the C-pillar portion is ≥8 mm.

[0021] Based on the first aspect, in some embodiments, the cross-section of the C-pillar is a step-shaped portion with two reverse bend angles, the outer edge of the C-pillar is provided with a flange connected to the rear wheel cover, the width H5 of the flange is 15-25 mm, and the width H6 of the step surface of the C-pillar connected to the flange is ≥30 mm.

[0022] Based on the first aspect, in some embodiments, the threshold portion includes a flange surface located at a lower edge, and a width H7 of the flange surface is 10-25 mm.

[0023] Based on the first aspect, in some embodiments, the rocker portion, the A-pillar portion, and the first roof rail portion are provided with continuous through ribs;

[0024] And / or, the through rib forms an "E"-shaped force transmission structure in the A-pillar portion, and the local bending-resistant section formed by the through rib in the A-pillar portion is "ㄇ"-shaped;

[0025] And / or, the local bending-resistant cross-section formed by the through rib at the threshold portion is in the shape of a Chinese character "ㄇ".

[0026] In a second aspect, a method for manufacturing the double door ring reinforcement structure of the side outer panel in any embodiment of the first aspect is provided, the key of which is to include:

[0027] S1: Laser welding the A-pillar blank, the B-pillar blank, the C-pillar blank, the door sill blank, the first roof side rail blank, and the second roof side rail blank into an integrated plate body with two closed door rings, wherein the A-pillar blank, the first roof side rail blank, the B-pillar blank, and the door sill blank form a first closed door ring, and the C-pillar blank, the second roof side rail blank, the B-pillar blank, and the door sill blank form a second closed door ring;

[0028] S2: The one-piece plate body is formed into the one-piece side outer panel double door ring assembly by hot stamping, the hot stamping depth is ≤250mm, and the minimum draft degree of all the hot stamping surfaces along the stamping direction is ≥5 degrees.

[0029] Based on the second aspect, in some embodiments, the side outer panel double door ring assembly further includes an A-pillar upper patch plate, the A-pillar upper patch plate starting from the upper end of the A-pillar and extending along the first upper side rail portion to the upper end of the B-pillar, the A-pillar upper patch plate being hot stamped together with the integrated plate body;

[0030] And / or, the A-pillar upper patch plate and the entire first roof rail portion are molded together to form a bending-resistant cross-section that is an arch;

[0031] And / or, the thickness of the patch sheet on the A-pillar is 1.2 to 2.2 mm.

[0032] Based on the second aspect, in some embodiments, the side outer panel double door ring assembly further includes an A-pillar lower patch plate, the A-pillar lower patch plate is provided on the A-pillar portion and is located between the upper end portion of the A-pillar and the lower end portion of the A-pillar, and the A-pillar lower patch plate is hot stamped together with the integrated plate body;

[0033] And / or, the thickness of the A-pillar lower patch sheet is 1.2 to 1.8 mm.

[0034] Based on the second aspect, in some embodiments, the thickness of the A-pillar blank is 1.2 to 1.6 mm;

[0035] And / or, the thickness of the blanking sheet of the first upper side rail is 1.4 to 2.0 mm;

[0036] And / or, the thickness of the blanking sheet of the second upper side rail is 0.8 to 1.4 mm;

[0037] And / or, the thickness of the C-pillar blank is 0.8 to 1.4 mm;

[0038] And / or, the threshold blanking sheet has a thickness of 1.0 to 1.6 mm;

[0039] And / or, the thickness of the B-pillar blank is 1.4 to 2.0 mm, and the B-pillar blank includes an upper part, a middle part and a lower part of the blank distributed in sequence, and the thickness distribution of the upper part, the middle part and the lower part of the blank is: the lower part of the blank ≤ the upper part of the blank ≤ the middle part of the blank.

[0040] On the third aspect, a side outer panel reinforcement assembly is provided, the key of which is that it includes a front finger beam of the door, a rear wheel cover and the double door ring reinforcement structure of the side outer panel as described above, the rear wheel cover is connected to the C-pillar part, and the front finger beam is connected to the A-pillar part.

[0041] Beneficial effects of the present invention: The present invention integrates the side panel outer panel sheet as a whole, and then hot stamps it into a side panel outer panel double door ring reinforcement structure with front and rear door rings. The front and rear door rings form two continuous closed annular structures, and the shared B-pillar portion forms a closed and stable "sun" shaped structure. The "sun" shaped structure effectively improves the overall rigidity and precision of the entire side panel, and the continuity and integrity between the components in each area are higher, and the strength and rigidity are better; spot welding is not used for connection, and there are no hidden dangers such as welding defects and welding failures; there is no overlap of weld points, which can achieve weight reduction of the side panel outer panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic structural diagram of a double door ring reinforcement structure of a side outer panel according to an exemplary embodiment of the present invention;

[0043] Figure 2 for Figure 1 Rear view;

[0044] Figure 3 for Figure 1 Stereoscopic image of

[0045] Figure 4 for Figure 2 Middle AA section;

[0046] Figure 5 for Figure 2 Middle BB cross-section;

[0047] Figure 6 for Figure 2 mid-CC cross-section;

[0048] Figure 7 for Figure 2 Schematic diagram of the structure of the through rib;

[0049] Figure 8 for Figure 2 Middle DD section;

[0050] Figure 9This is a process flow chart of a method for manufacturing a double door ring reinforcement structure of a side outer panel according to an exemplary embodiment of the present invention;

[0051] Figure 10 for Figure 2 Middle EE cross-section;

[0052] Figure 11 It is a structural schematic diagram of a side outer panel reinforcement assembly according to an exemplary embodiment of the present invention;

[0053] Among them, 1-A pillar; 2-B pillar; 3-C pillar; 4-door sill; 5-first upper side beam; 6-second upper side beam; 101-upper end of A pillar; 102-lower end of A pillar; 201-upper end of B pillar; 202-lower end of B pillar; 301-upper end of C pillar; 302-lower end of C pillar; 7-inclined surface; 8-first corner; 9-second corner; 10-third corner; 11-fourth corner; 12-secondary step surface; 13-flange; 14-flange surface; 15-through rib; 16-upper patch plate of A pillar; 17-lower patch plate of A pillar; 18-door anti-collision beam; 19-front finger beam; 20-rear wheel arch. DETAILED DESCRIPTION

[0054] The following describes the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will readily appreciate the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the various details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are intended only to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0055] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0056] Figure 1 This is a schematic structural diagram of a double door ring reinforcement structure of a side outer panel according to an exemplary embodiment of the present invention; Figure 2 for Figure 1 rear view.

[0057] Please see the attached Figure 1 and 2As shown: This exemplary embodiment proposes a side outer panel double-door ring reinforcement structure, including a side outer panel double-door ring assembly, which is hot-stamped from an integral plate body with two closed door rings; the side outer panel double-door ring assembly includes an A-column part 1, a B-column part 2, a C-column part 3, a sill part 4, a first upper side beam part 5 and a second upper side beam part 6. The A-column part 1 includes an upper A-column end part 101 and a lower A-column end part 102; the B-column part 2 includes an upper B-column end part 201 and a lower B-column end part 202; the C-column part 3 includes an upper C-column end part 301 and a lower C-column end part 302; the sill part 4 is located between the lower A-column end part 102 and the lower C-column end part 302, and the lower B-column end part 202 is connected to the middle of the sill part 4; the first upper side beam part 5 is located between the upper B-column end part 201 and the upper A-column end part 101; the second upper side beam part 6 is located between the upper B-column end part 201 and the upper C-column end part 301; the A-column part 1, the first upper side beam part 5, the B-column part 2 and the sill part 4 form a first closed door ring, that is, the front door ring, and the C-column part 3, the second upper side beam part 6, the B-column part 2 and the sill part 4 form a second closed door ring, that is, the rear door ring. The front door ring and the rear door ring form a closed and stable "day" - shaped structure through the shared B-column part 2. Integrally forming the sill part 4 and the C-column part 3 improves the side collision performance and the torsional stiffness of the whole vehicle, ensuring the safety of the driver and passengers and improving the driving control performance.

[0058] First, since the size of the part becomes larger and the stamping depth of the part increases after the integration of the side outer panel double-door ring, it often exceeds the maximum demolding depth of the current hot stamping equipment, increasing the forming difficulty. Therefore, it is necessary to carry out an adaptive design for the double-door ring structure, specifically:

[0059] Please refer to the attached Figure 3 and 4 As shown, there is a pointed position at the lower A-column end part 102, and cracking may occur at the pointed position due to excessive thinning of the material. Therefore, in some embodiments, the pointed position at the corner where the A-column part 1 is connected to the sill part 4 is processed with a C-corner to form a gently sloping surface 7 with a smooth transition. This reduces the resistance during sheet metal forming, improves the bending fluidity of sheet metal forming, and at the same time reduces the forming depth of this pointed position, reducing the forming difficulty.

[0060] Please refer to the attached Figure 2As shown, the two corner positions of the lower part of the inner ring of the front door ring have drastic changes in the profile due to product limitations, and are difficult to form. In order to ensure that the door opening corners are not cracked, in some embodiments, in the first closed door ring, the connection between the A-pillar portion 1 and the door sill portion 4 forms a first corner 8, and the connection between the B-pillar portion 2 and the door sill portion 4 forms a second corner 9. The inner fillet radius R1 of the first corner 8 is greater than or equal to 2.5 times the depth H1 of the hot stamping at the first corner 8, and the inner fillet radius R2 of the second corner 9 is greater than or equal to 2.5 times the depth H2 of the hot stamping at the second corner 9.

[0061] Please see the attached Figure 2 As shown, to further meet the requirements of R1 ≥ 2.5H1 and R2 ≥ 2.5H2 and reduce implementation difficulty, a secondary step surface 12 is provided at the first corner 8 to reduce the forming depth; a secondary step surface 12 is provided at the second corner 9 to reduce the forming depth. In addition, the provision of the step surface can reduce the forming depth of the corner area, meeting the hot stamping depth requirements.

[0062] Please see the attached Figure 2 As shown, the two corner positions of the lower part of the inner ring of the rear door ring have a sharp change in the profile due to product limitations, and are difficult to form. In order to ensure that the door opening corners are not cracked, in some embodiments, the third corner 10 formed at the connection between the C-pillar portion 3 and the door sill portion 4 and the fourth corner 11 formed at the connection between the B-pillar portion 2 and the door sill portion 4 must meet the following parameter requirements: the inner fillet radius R3 of the third corner 10 is greater than or equal to 2.5 times the depth H3 of the hot stamping at the third corner 10, and the inner fillet radius R4 of the fourth corner 11 is greater than or equal to 2.5 times the depth H4 of the hot stamping at the fourth corner 11.

[0063] Please see the attached Figure 2 As shown, to further meet the requirements of R3 ≥ 2.5H3 and R4 ≥ 2.5H4 and reduce implementation difficulty, a secondary step surface 12 for reducing the forming depth is provided at the third corner 10; and / or a secondary step surface 12 for reducing the forming depth is provided at the fourth corner 11. In addition, the provision of the step surface can reduce the forming depth of the corner area, meeting the hot stamping depth requirements.

[0064] The forming depth of the front and rear double door ring door opening area is relatively deep. In order to avoid excessive sheet material resistance during forming, which may affect the forming performance of the entire door opening and even cause local cracking, the front and rear door opening radius is made as large as possible. Therefore, in some embodiments, please refer to the attached Figure 5 As shown, the cross-section of the threshold portion 4 formed by hot stamping has a corner radius R5 ≥ 6 mm; Figure 4As shown, the corner radius R6 of the cross section formed by hot stamping of the C-pillar portion 3 is ≥8 mm.

[0065] Please see the attached Figure 4 As shown, in some embodiments, the cross-section of the C-pillar 3 is a stepped shape with two oppositely curved corners. A flange 13 is provided on the outer edge of the C-pillar 3, connecting to the rear wheelhouse 20. The width H5 of the flange 13 is 15-25 mm to ensure that the flange 13 does not wrinkle during molding. Because the lower portion of the C-pillar 3 is smaller due to the shape and tire envelope, the width H6 of the stepped surface of the C-pillar 3 connecting to the flange 13 is ≥ 30 mm to ensure mold strength.

[0066] Please see the attached Figure 6 As shown, in some embodiments, the threshold portion 4 includes a flange surface 14 located at the lower edge, and the width H7 of the flange surface 14 is 10-25 mm to prevent the problem of unqualified flatness caused by the flange surface 14 being too long.

[0067] Secondly, during an offset collision, energy is transmitted to the A-pillar 1 via the first force transmission channel F1 of the front longitudinal member and the second force transmission channel F2 of the front finger beam 19. To further enhance the overall impact resistance of the double-door ring reinforcement structure of the side outer panel, further design was performed on the structure. Specifically:

[0068] Please see the attached Figure 2 and 7 As shown, in some embodiments, continuous through ribs 15 are provided on the rocker portion 4, the A-pillar portion 1 and the first roof rail portion 5 to improve the cross-section bending resistance; Figure 7 As shown in a, the through rib 15 forms an "E"-shaped force transmission structure in the A-pillar portion 1. The "E"-shaped force transmission structure can transmit force to the door anti-collision beam 18 provided on the vehicle door, so that part of the collision energy of the A-pillar portion 1 is transmitted and diffused through the door anti-collision beam 18 of the vehicle door through the "E"-shaped force transmission structure, reducing the force release pressure in the direction of the A-pillar upper end 101 and the first upper side beam and the force release pressure in the direction of the A-pillar lower end 102 and the door sill 4. In addition, the local bending-resistant section formed by the through rib 15 in the A-pillar portion 1 is a "ㄇ" shape, as shown in FIG. Figure 8 The local bending section formed by the through rib 15 at the threshold portion 4 is in the shape of a "ㄇ". Figure 6 As shown in Figure c, the "ㄇ"-shaped anti-bending interface effectively improves the overall impact resistance of the double-door ring reinforcement structure of the side outer panel, ensuring driver safety.

[0069] Figure 9 The present invention is a process flow chart of a method for manufacturing a double door ring reinforcement structure of a side outer panel, shown as an exemplary embodiment of the present invention.

[0070] Please see the attached Figure 9 As shown, this exemplary embodiment provides a method for manufacturing a side outer panel double door ring reinforcement structure, comprising:

[0071] S1: The A-pillar blank, the B-pillar blank, the C-pillar blank, the door sill blank, the first upper side beam blank, and the second upper side beam blank are laser welded into an integrated plate body with two closed door rings. The A-pillar blank, the first upper side beam blank, the B-pillar blank, and the door sill blank form the first closed door ring, and the C-pillar blank, the second upper side beam blank, the B-pillar blank, and the door sill blank form the second closed door ring.

[0072] S2: The integrated panel is hot stamped to form a one-piece side outer panel double door ring assembly. The hot stamping depth is ≤ 250mm, and the minimum draft along the stamping direction for all hot stamped surfaces is ≥ 5 degrees. During implementation, to ensure the double door ring structure and more easily meet the hot stamping depth and minimum draft requirements, the stamping direction needs to be rotated a certain angle from the Y-axis along the X-axis.

[0073] Please see the attached Figure 1 and 11 As shown, in some embodiments, the side outer panel double door ring assembly also includes an A-pillar upper patch plate 16, the A-pillar upper patch plate 16 starts from the A-pillar upper end 101 and extends along the first upper side beam portion 5 to the B-pillar upper end 201, and the A-pillar upper patch plate 16 is hot stamped together with the integrated plate body; the position where the A-pillar upper patch plate 16 is set includes but is not limited to the above-mentioned setting position, and can be reasonably distributed according to the collision simulation analysis. In addition, in order to meet the different collision requirements of different parts, the bending-resistant cross-section formed by the A-pillar upper patch plate 16 and the entire first upper side beam portion 5 is a circular arch, such as Figure 11 Meanwhile, the thickness of the A-pillar upper patch plate 16 is 1.2-2.2 mm.

[0074] The A-pillar upper patch plate 16 can assist the first roof side rail in diffusing the collision energy to the B-pillar portion 2 , thereby preventing the first roof side rail from bending and failing during the force transmission process.

[0075] Please see the attached Figure 1 and 8As shown, in some embodiments, the side outer panel double door ring assembly further includes an A-pillar lower patch plate 17, which is disposed within the A-pillar portion 1 and positioned between the A-pillar upper end 101 and the A-pillar lower end 102. The A-pillar lower patch plate 17 is hot stamped together with the integrated plate body. The positions of the A-pillar lower patch plate 17 include, but are not limited to, those described above and can be reasonably distributed based on collision simulation analysis. To meet the varying collision requirements of different locations, the A-pillar lower patch plate 17 has a thickness of 1.2 to 1.8 mm.

[0076] The setting position of the A-pillar lower patch plate 17 coincides with the "E"-shaped force transmission structure, which can assist the A-pillar portion 1 in transmitting and diffusing energy to the door anti-collision beam 18 provided on the vehicle door.

[0077] In some embodiments, the A-pillar blanking sheet has a thickness of 1.2 to 1.6 mm; the first roof side sill blanking sheet has a thickness of 1.4 to 2.0 mm; the second roof side sill blanking sheet has a thickness of 0.8 to 1.4 mm; the C-pillar blanking sheet has a thickness of 0.8 to 1.4 mm; the door sill blanking sheet has a thickness of 1.0 to 1.6 mm; and the B-pillar blanking sheet has a thickness of 1.4 to 2.0 mm. The B-pillar blanking sheet includes an upper sheet, a middle sheet, and a lower sheet, and the thickness distribution of the upper sheet, the middle sheet, and the lower sheet is: lower sheet ≤ upper sheet ≤ middle sheet, to meet different collision requirements of different parts.

[0078] Figure 11 FIG2 is a schematic diagram of a side panel reinforcement assembly according to an exemplary embodiment of the present invention. It should be noted that the door anti-collision beam 18 is provided on the door. Figure 11 The anti-collision beam 11 is only used to illustrate the direction of force transmission.

[0079] Please see the attached Figure 11 As shown, this exemplary embodiment proposes a side outer panel reinforcement assembly, including a front finger beam 19, a rear wheel cover 20 and the side outer panel double door ring reinforcement structure described in any of the above embodiments, the rear wheel cover 20 is connected to the C-pillar portion 3, and the front finger beam 19 is connected to the A-pillar portion 1. Figure 11 As shown, during an offset collision, energy is transmitted to the A-pillar 1 through the first force transmission channel F1 of the front longitudinal beam and the second force transmission channel F2 of the front finger beam 19. The A-pillar 1 simultaneously releases the collision energy to the third force transmission channel F3 of the rocker 4, the fourth force transmission channel F4 of the first upper side beam, and the fifth force transmission channel F5 of the door anti-collision beam 18, transmitting the energy backward for consumption, thereby ensuring the safety of the occupants in the cab.

[0080] In summary, this embodiment uses hot stamping to form an integrated panel with two closed door rings to form an integrated side outer panel double door ring reinforcement structure, with ultra-high integration of the front and rear door rings. During an offset collision, the A-pillar portion 1 receives the impact energy and releases the force in three directions to the first upper side beam, the door sill portion 4, and the door anti-collision beam 18 arranged on the door. In addition, the door sill portion 4 and the C-pillar portion 3 are formed as one piece, which improves the side collision performance and the torsional stiffness of the entire vehicle, ensures the safety of the driver and passengers, and improves the driving control performance.

[0081] By integrating multiple single-piece sheets into a whole plate and then shaping it, the door sill beam forms a continuous overall structure from front to back, eliminating the traditional single-piece molding and then spot welding splicing, eliminating the spot welding process, and eliminating the overlap edges between single pieces, reducing product weight, avoiding welding defects and welding failure modes, and improving the overall strength of the door sill. During a collision, especially a side collision, it avoids the door sill beam from bending due to welding failure, which affects the safety of the entire vehicle.

[0082] The front and rear door rings are segmented according to performance requirements, with varying material thicknesses. Precise material thickness design eliminates redundancy and further reduces overall product weight. Nearly twenty parts were integrated into a single, integrated hot stamping process. Tooling requirements have been reduced from nearly seventy molds, twenty gauges, and five fixtures to just one mold and one gauge, significantly reducing tooling, human resources, and development costs. This minimizes welding steps, shortens dimensional chains, and reduces welding debugging time, facilitating product precision, shortening development cycles, and enabling rapid product iteration.

[0083] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, any equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A double door ring reinforcement structure for a side outer panel, characterized by: The side panel outer panel double door ring assembly is hot stamped from an integral plate body with two closed door rings; the side panel outer panel double door ring assembly includes: An A-pillar portion, including an A-pillar upper end portion and an A-pillar lower end portion; A B-pillar portion, including a B-pillar upper end portion and a B-pillar lower end portion; A C-pillar portion, including a C-pillar upper end portion and a C-pillar lower end portion; A rocker portion is located between the lower end of the A-pillar and the lower end of the C-pillar, and the lower end of the B-pillar is connected to the middle portion of the rocker portion; a first roof rail portion, located between an upper end portion of the B-pillar and an upper end portion of the A-pillar; A second roof rail portion, located between an upper end portion of the B-pillar and an upper end portion of the C-pillar; The A-pillar portion, the first roof side rail portion, the B-pillar portion and the rocker portion form a first closed door ring, and the C-pillar portion, the second roof side rail portion, the B-pillar portion and the rocker portion form a second closed door ring; In the first closed door ring, the connection between the A-pillar portion and the threshold portion forms a first corner, and the connection between the B-pillar portion and the threshold portion forms a second corner. The inner fillet radius R1 of the first corner is greater than or equal to 2.5 times the depth H1 of the hot stamping at the first corner, and the inner fillet radius R2 of the second corner is greater than or equal to 2.5 times the depth H2 of the hot stamping at the second corner.

2. The side outer panel double door ring reinforcement structure according to claim 1, characterized in that: The tip position of the corner where the A-pillar portion and the door sill portion are connected is processed into a C-angle to form a gently transitioning inclined surface.

3. The side outer panel double door ring reinforcement structure according to claim 1, characterized in that: A secondary step surface for reducing the forming depth is provided at the first corner; And / or, a secondary step surface for reducing the forming depth is provided at the second corner.

4. The side outer panel double door ring reinforcement structure according to claim 1, characterized in that: In the second closed door ring, the connection between the C-pillar and the threshold forms a third corner, and the connection between the B-pillar and the threshold forms a fourth corner. The inner fillet radius R3 of the third corner is greater than or equal to 2.5 times the depth H3 of the hot stamping at the third corner, and the inner fillet radius R4 of the fourth corner is greater than or equal to 2.5 times the depth H4 of the hot stamping at the fourth corner.

5. The side outer panel double door ring reinforcement structure according to claim 4, characterized in that: The third corner is provided with a secondary step surface for reducing the forming depth; And / or, a secondary step surface for reducing the forming depth is provided at the fourth corner.

6. The side outer panel double door ring reinforcement structure according to claim 1, characterized in that: The cross-section of the threshold formed by hot stamping has a corner radius R5 ≥ 6 mm; And / or, the cross-section of the C-pillar portion formed by hot stamping has a corner radius R6 ≥ 8 mm.

7. The side outer panel double door ring reinforcement structure according to claim 1, characterized in that: The cross-section of the C-pillar is a step-shaped portion with two reverse bends. The outer edge of the C-pillar is provided with a flange connected to the rear wheel cover. The width H5 of the flange is 15-25mm, and the width H6 of the step surface of the C-pillar connected to the flange is ≥30mm.

8. The side outer panel double door ring reinforcement structure according to claim 1, characterized in that: The threshold portion includes a flange surface located at a lower edge, and a width H7 of the flange surface is 10-25 mm.

9. The side outer panel double door ring reinforcement structure according to claim 1, characterized in that: The rocker portion, the A-pillar portion and the first roof rail portion are provided with continuous through ribs; And / or, the through rib forms an "E"-shaped force transmission structure in the A-pillar portion, and the local bending-resistant section formed by the through rib in the A-pillar portion is a "ㄇ" shape; And / or, the local bending-resistant cross-section formed by the through rib at the threshold portion is in the shape of a Chinese character "ㄇ".

10. A method for manufacturing a double door ring reinforcement structure of a side outer panel according to any one of claims 1 to 9, characterized in that: include: S1: Laser welding the A-pillar blank, the B-pillar blank, the C-pillar blank, the door sill blank, the first roof side rail blank, and the second roof side rail blank into an integrated plate body with two closed door rings, wherein the A-pillar blank, the first roof side rail blank, the B-pillar blank, and the door sill blank form a first closed door ring, and the C-pillar blank, the second roof side rail blank, the B-pillar blank, and the door sill blank form a second closed door ring; S2: The one-piece plate body is formed into an one-piece side outer panel double door ring assembly by hot stamping, the hot stamping depth is ≤250mm, and the minimum draft degree of all surfaces formed by the hot stamping along the stamping direction is ≥5 degrees.

11. The method for manufacturing a double door ring reinforcement structure of a side outer panel according to claim 10, characterized in that: The side outer panel double door ring assembly further includes an A-pillar upper patch plate, which starts from the upper end of the A-pillar and extends along the first upper side rail portion to the upper end of the B-pillar, and the A-pillar upper patch plate is hot stamped together with the integrated plate body; And / or, the A-pillar upper patch plate and the entire first roof rail portion are molded together to form a bending-resistant cross-section that is an arch; And / or, the thickness of the patch sheet on the A-pillar is 1.2 to 2.2 mm.

12. The method for manufacturing a double door ring reinforcement structure of a side outer panel according to claim 10, characterized in that: The side outer panel double door ring assembly further includes an A-pillar lower patch plate, which is provided on the A-pillar portion and located between the upper end portion and the lower end portion of the A-pillar, and is formed by hot stamping together with the integrated plate body; And / or, the thickness of the A-pillar lower patch sheet is 1.2 to 1.8 mm.

13. A method for manufacturing a double door ring reinforcement structure of a side outer panel according to any one of claims 11 to 12, characterized in that: The thickness of the A-pillar blank is 1.2 to 1.6 mm; And / or, the thickness of the blanking sheet of the first upper side rail is 1.4 to 2.0 mm; And / or, the thickness of the blanking sheet of the second upper side rail is 0.8 to 1.4 mm; And / or, the thickness of the C-pillar blank is 0.8 to 1.4 mm; And / or, the threshold blanking sheet has a thickness of 1.0 to 1.6 mm; And / or, the thickness of the B-pillar blank is 1.4 to 2.0 mm, and the B-pillar blank includes an upper part, a middle part and a lower part of the blank distributed in sequence, and the thickness distribution of the upper part, the middle part and the lower part of the blank is: the lower part of the blank ≤ the upper part of the blank ≤ the middle part of the blank.

14. A side outer panel reinforcement assembly, characterized in that: It comprises a front finger beam, a rear wheel cover and a side outer panel double door ring reinforcement structure according to any one of claims 1 to 9, wherein the rear wheel cover is connected to the C-pillar portion, and the front finger beam is connected to the A-pillar portion.

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