Long panel for vehicle body and vehicle body structure

Abstract

To provide a long panel for a vehicle body that is able to reduce an amount of spring back and to provide a vehicle body structure having the same.SOLUTION: A long panel 10 for a vehicle body formed by press working has: a flat general portion 11 extending in a lengthwise direction; a pair of ridge-line forming portions 12, 13 formed by bending both widthwise ends of the general portion 11 and forming a pair of ridge lines 14, 15 together with the general portion 11; and a plurality of square seat surface portions 20 formed to protrude from the general portion 11 in a thickness direction, disposed at intervals in the lengthwise direction, and having a quadrangular shape in a plan view. Each of the square seat surface portions 20 has: a pair of widthwise outer edge parts extending along the ridge lines 14, 15 in the vicinity of the ridge lines 14, 15; and a pair of lengthwise outer edge portions connecting both lengthwise ends of each of the widthwise outer edge parts.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a long panel for a vehicle body formed by press working and a vehicle body structure including the same. [Background technology]

[0002] Long panels extending in the extension direction of the skeleton are used in skeleton parts such as pillar parts, roof rail parts, and side sill parts of the body of an automobile vehicle (see, for example, Patent Document 1). Patent Document 1 describes that a center pillar part is configured with a long outer panel that forms an outer part in the vehicle width direction, a long inner panel that forms an inner part in the vehicle width direction, and a hinge reinforcement disposed inside the outer panel. In Patent Document 1, the inner panel, outer panel, and hinge reinforcement are each formed by press working.

[0003] The hinge reinforcement in Patent Document 1 has a U-shaped cross section and includes a top plate portion at the center in the width direction and a pair of vertical wall portions that are bent and extended from ridgelines at both ends of the top plate portion in the width direction. A plurality of welding protrusions are formed on the top plate portion and protrude outward in the vehicle width direction by a predetermined height, and the welding protrusions are arranged intermittently along the vehicle vertical direction. The outer surfaces of the welding protrusions form welding bearing surfaces and are formed flat. The welding protrusions are formed in a semicircular or circular shape, and can be formed in various shapes such as rectangular, triangular, elliptical, and hexagonal. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-1653 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, the hinge reinforcement of Patent Document 1 is formed by press working, and therefore tensile stress occurs at the ridge line formed by the top plate portion and the vertical wall portion during press working. When tensile stress occurs at the ridge line along the longitudinal direction of a long panel for a vehicle body, there is a problem in that the amount of springback after press working becomes large.

[0006] The present invention has been made in consideration of the above circumstances, and its object is to provide a long panel for a vehicle body that can reduce the amount of springback, and a vehicle body structure equipped with the same. [Means for solving the problem]

[0007] According to the present invention, A long panel for a vehicle body formed by press working, a flat general portion extending in a longitudinal direction; a pair of ridge line forming portions formed by bending both widthwise ends of the general portion and forming a pair of ridge lines together with the general portion; a plurality of angular seating surface portions, each having a rectangular shape in a plan view, formed on the general portion so as to protrude in the thickness direction and arranged at intervals in the longitudinal direction; A long panel for a vehicle body is provided in which each corner seating surface portion has a pair of widthwise outer edge portions extending along the ridge line in the vicinity of the ridge line, and a pair of longitudinal outer edge portions respectively connecting both longitudinal ends of each widthwise outer edge portion.

[0008] According to this vehicle body long panel, the state of stress generated in each ridge line portion after press working differs between the seating surface forming section, where angular seating surface portions are formed adjacent to each ridge line, and the general section, where no angular seating surface portions are formed. First, in the general section, stress is mainly caused by bending each ridge line forming section relative to the general section, resulting in tensile stress in each ridge line portion. On the other hand, in the seating surface forming section, stress is caused by bending each ridge line forming section and also by protruding each angular seating surface portion relative to the general section, resulting in compressive stress or a tensile stress smaller than that in the general section. This reduces the amount of springback after press working.

[0009] In the above-mentioned long panel for a vehicle body, it is preferable that compressive stress is generated in the portions of each ridge line where the angular seating surface portions are formed adjacent to each other.

[0010] With this long vehicle body panel, after press working, compressive stress occurs in the bearing surface forming section of each ridge line portion, and tensile stress and compressive stress occur alternately in the general section and the bearing surface forming section of each ridge line portion. This makes it possible to divide the section where tensile stress occurs in each ridge line portion in the longitudinal direction at the section where compressive stress occurs, and it is possible to dramatically reduce the amount of springback of the long vehicle body panel after bending.

[0011] In addition, in the above-mentioned long panel for a vehicle body, each corner seating portion has a flat seating body in the center when viewed from above, and an inclined portion formed around the seating body and connecting the seating body and the general portion, and it is preferable that the protruding height of the seating body from the general portion is greater than the plate thickness of the long panel for a vehicle body.

[0012] According to this long vehicle body panel, compressive stress can be reliably generated at each ridge line portion.

[0013] In the above-described long panel for a vehicle body, each of the corner seating surface portions may be formed in a rectangular shape in a plan view.

[0014] According to this long vehicle body panel, the outer edges of the corner seating portions in the longitudinal direction are perpendicular to the ridge lines.

[0015] Furthermore, according to the present invention, there is provided a vehicle body structure including the above-mentioned long vehicle body panel and a second panel that forms a closed cross section together with the long vehicle body panel. [Effects of the Invention]

[0016] According to the present invention, it is possible to reduce the amount of springback of a long panel for a vehicle body. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic perspective view of a vehicle body showing an embodiment of the present invention. [Figure 2] FIG. 2 is a side view of the long panel for a vehicle body. [Figure 3] FIG. 2 is a front cross-sectional view of a long panel for a vehicle body. [Figure 4] FIG. 2 is a partially enlarged side view of the long panel for a vehicle body. [Figure 5] 5 is a cross-sectional view taken along CC in FIG. 4. [Figure 6] FIG. 5 is a cross-sectional view taken along the line DD in FIG. 4. DETAILED DESCRIPTION OF THE INVENTION

[0018] Figures 1 to 5 show one embodiment of the present invention, with Figure 1 being a schematic perspective view of a vehicle body, Figure 2 being a side view of a long vehicle body panel, Figure 3 being a front cross-sectional view of the long vehicle body panel, Figure 4 being an enlarged side view of a portion of the long vehicle body panel, Figure 5 being a cross-sectional view taken along CC in Figure 4, and Figure 6 being a cross-sectional view taken along DD in Figure 4. Note that Figure 2 is a side view of the long vehicle body panel in the A-pillar portion on the right side of the vehicle, and the front side of the page is the inside in the vehicle width direction.

[0019] The long vehicle body panel 10 of this embodiment is formed by press working and used in an automobile vehicle. As shown in FIG. 1 , the vehicle body 1 is formed by an A-pillar portion 2, a B-pillar portion 3, a C-pillar portion 4, a roof rail portion 5, a side sill portion 6, etc. The long vehicle body panel 10 of this embodiment is a high-tensile steel plate having a tensile strength of 1180 MPa or more, and is used for the A-pillar portion 2. Specifically, the long vehicle body panel 10 is assembled into the vehicle body 1 so that its longitudinal direction is generally in the extension direction of the A-pillar portion 2, its width direction is the up-down direction, and its thickness direction is the vehicle width direction. As shown in FIG. 1 , in this embodiment, the A-pillar portion 2 extends in the front-to-rear direction, sloping downward toward the front.

[0020] As shown in Fig. 2, the long vehicle body panel 10 extends in the extension direction of the A-pillar portion 2 and has a flat general portion 11 extending in the longitudinal direction, a first flange portion 12 formed by bending one widthwise end of the general portion 11, and a wall portion 13 formed by bending the other widthwise end of the general portion 11. The plate thickness of the long vehicle body panel 10 is arbitrary, but can be, for example, 1.0 mm to 2.0 mm, and is 1.4 mm in this embodiment. In this embodiment, the first flange portion 12 and the wall portion 13, which serve as a pair of ridgeline-forming portions, form a first ridgeline 14 and a second ridgeline 15 together with the general portion 11.

[0021] 3, when the long vehicle body panel 10 is assembled into the vehicle body 1, in a front cross section, the general portion 11 extends in the vertical direction, the first flange portion 12 extends from the upper end of the general portion 11 inward in the vehicle width direction, and the wall portion 13 extends from the lower end of the general portion 11 in a downwardly sloping manner outward in the vehicle width direction. That is, the first ridge line 14 is formed so as to convex obliquely upward toward the outer side in the vehicle width direction, and the second ridge line 15 is formed so as to convex obliquely downward toward the inner side in the vehicle width direction. In this embodiment, the long vehicle body panel 10 has a second flange portion 16 extending downward from the inner end of the wall portion 13 in the vehicle width direction.

[0022] As shown in FIG. 2 , the vehicle body elongated panel 10 has a plurality of corner seating portions 20 formed at intervals in the longitudinal direction on the general portion 11 and protruding in the thickness direction of the general portion 11. In this embodiment, the corner seating portions 20 protrude inward in the vehicle width direction, have a rectangular shape in plan view, and are formed at five locations on the general portion 11. As shown in FIG. 4 , each corner seating portion 20 has a flat seating body 21 in the center in plan view and an inclined portion 22 formed around the seating body 21 and connecting the seating body 21 to the general portion 11. In this embodiment, as shown in FIGS. 5 and 6 , the protruding height of the seating body 21 from the general portion 11 is greater than the thickness of the vehicle body elongated panel 10. Each corner seating portion 20 can be used for any purpose, such as a harness attachment point, a trim attachment point, a portion for forming a positioning hole, or a portion for correcting the position of a bracket. Holes can also be formed in the seating body 21 as needed.

[0023] 4 , each corner seating surface portion 20 has a first straight edge portion 23 and a second straight edge portion 24 extending along the first ridge line 14 and the second ridge line 15 in the vicinity thereof, and a pair of linear third straight edge portions 25 and a pair of linear fourth straight edge portions 26 connecting both longitudinal ends of the first straight edge portion 23 and the second straight edge portion 24. The first and second straight edge portions 23, 24 as a pair of widthwise outer edges and the third and fourth straight edge portions 25, 26 as a pair of longitudinal outer edges form the outer edge of the inclined portion 22. In this embodiment, each corner seating surface portion 20 is formed in a rectangular shape in a plan view, and the third straight edge portion 25 and the fourth straight edge portion 26 are perpendicular to the ridge lines 14, 15.

[0024] Here, the inclination angles α and β of the inclined portions 22 relative to the general portion 11 and the seat main body 21 (see FIGS. 5 and 6 ) are arbitrary. However, the first inclination angle α of the inclined portions 22 located at the longitudinal ends of the seat main body 21 is set within a range that does not cause defects such as cracks during molding. The second inclination angle β of the inclined portions 22 located at the widthwise ends of the seat main body 21 is determined taking into account the stress acting on each ridge 14, 15. For example, the first inclination angle α is 30 degrees or more, and the second inclination angle β is 45 degrees or more. In this embodiment, the second inclination angle β is larger than the first inclination angle α, specifically, 60 degrees. In addition, the distances between the first straight edge portions 23 and 24 and the first ridge 14 and second ridge 15 are also arbitrary. For example, the distances can be set to 20% or less of the widthwise dimension of the general portion 11, and in this embodiment, the distances are set to 15%.

[0025] As shown in Fig. 3, the long vehicle body panel 10 is an inner panel of the A-pillar portion 2, and forms a closed cross section together with the outer panel 8 of the A-pillar portion 2. In this embodiment, the A-pillar portion 2 further includes a reinforcement panel 9 that divides the closed cross section in the vehicle width direction. Specifically, the long vehicle body panel 10 is joined to the outer panel 8, which serves as a second panel, and the reinforcement panel 9 at a first flange portion 12 and a second flange portion 16.

[0026] In the vehicle body long panel 10 configured as described above, as shown in FIG. 2, the state of stress generated in the first ridge line 14 and the second ridge line 15 after press forming differs between the seating surface forming section A, where the angular seating surface portions 20 are formed adjacent to each ridge line 14, 15, and the general section B, where the angular seating surface portions 20 are not formed. First, in the general section B, stress is mainly caused by bending the first flange portion 12 and the wall portion 13 relative to the general section 11, resulting in tensile stress in the first ridge line 14 and the second ridge line 15. On the other hand, in the seating surface forming section A, stress is caused by bending the first flange portion 12 and the wall portion 13 and by protruding each angular seating surface portion 20 relative to the general section 11, resulting in compressive stress or a tensile stress smaller than that in the general section B in the first ridge line 14 and the second ridge line 15. This reduces the amount of springback after press forming. Therefore, the material, thickness, shape, etc. of the long panel 10 for a vehicle body can be selected relatively freely when designing the vehicle body, and the time required to form the mold used in the press working can be shortened.

[0027] In this embodiment, compressive stress occurs in the first ridge line 14 and the second ridge line 15 in the bearing surface forming section A. That is, tensile stress and compressive stress occur alternately in the general section B and the bearing surface forming section A in the first ridge line 14 and the second ridge line 15. This allows the section in which tensile stress occurs in the first ridge line 14 and the second ridge line 15 to be divided in the longitudinal direction by the section in which compressive stress occurs, thereby dramatically reducing the amount of springback of the long vehicle body panel 10 after bending. In this embodiment, the protruding height of the bearing surface main body 21 from the general section 11 is greater than the plate thickness of the long vehicle body panel 10, so compressive stress can be reliably generated in the first ridge line 14 and the second ridge line 15.

[0028] In the above embodiment, an example has been shown in which the present invention is applied to the inner panel of the A-pillar portion 2, but the present invention may also be applied to the outer panel 8, reinforcement panel 9, etc. of the A-pillar portion 2. In addition to the A-pillar portion 2, the present invention can also be applied to long panels such as the B-pillar portion 3, C-pillar portion 4, roof rail portion 5, and side sill portion 6, as long as they have a flat general portion extending in the longitudinal direction and a pair of ridge line forming portions that are formed by bending both widthwise ends of the general portion and form a pair of ridge lines together with the general portion.

[0029] In the above embodiment, each of the corner seating surfaces 20 is rectangular in plan view, but it is sufficient that each corner seating surface is formed in a quadrangular shape, for example, a parallelogram or trapezoid in plan view. Also, while all of the seating surfaces formed in the general portion 11 of the long vehicle body panel 10 are corner seating surfaces 20, the remaining seating surfaces may be round, etc., as long as at least two of the seating surfaces are corner seating surfaces. Furthermore, the number of corner seating surfaces 20 can be changed as desired.

[0030] Although the embodiments of the present invention have been described above, the invention according to the claims is not limited to the embodiments described above. It should be noted that not all of the combinations of features described in the embodiments are necessarily essential to the means for solving the problems of the invention. [Explanation of symbols]

[0031] 1. Body 2 A-pillar section 3 B-pillar section 4 C-pillar section 5 Roof rail section 6 Side sill 8 Outer Panel 9 Reinforcement panel 10 Long body panels 11 General section 12 First flange 13 Wall 14 First Ridge 15 Second Ridge 16 Second flange 20 Square seat 21 Seat body 22 Slope 23 First straight edge 24 Second straight edge 25 Third straight edge 26 Fourth straight edge A. Seat forming section B. General section α 1st tilt angle β 2nd angle of inclination

Claims

1. A long panel for a vehicle body formed by press working, a flat general portion extending in a longitudinal direction; a pair of ridge line forming portions formed by bending both widthwise ends of the general portion and forming a pair of ridge lines together with the general portion; a plurality of angular seating surface portions, each having a rectangular shape in a plan view, formed on the general portion so as to protrude in the thickness direction and arranged at intervals in the longitudinal direction; Each corner seating surface portion has a pair of widthwise outer edge portions extending along the ridge line in the vicinity of the ridge line, and a pair of longitudinal outer edge portions connecting both longitudinal ends of each widthwise outer edge portion.

2. 2. The vehicle body elongated panel according to claim 1, wherein compressive stress is generated in the portions of each of the ridgelines where the angular seating surface portions are formed adjacent to each other.

3. Each corner seat portion has a flat seat body in the center in a plan view, and an inclined portion formed around the seat body and connecting the seat body and the general portion, The elongated panel for a vehicle body according to claim 2, wherein a protruding height of the seat body from the general portion is greater than a plate thickness of the elongated panel for a vehicle body.

4. The vehicle body elongated panel according to claim 3, wherein each of the corner seating surface portions is formed in a rectangular shape in a plan view.

5. The vehicle body elongated panel according to any one of claims 1 to 4, a second panel that forms a closed cross section together with the long panel for the vehicle body.

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