JP2012001024A - Vehicle body member of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently exhibit axial crush performance by an effective theory of Karman, by exhibiting desired dimensional accuracy by restraining deformation by spring back, port opening or warping by residual stress in molding, without applying a countermeasure such as an increase in a plate thickness of a high strength steel plate and addition of a reinforce of a separate constitution.SOLUTION: A step bead 6 extending in a stairs shape over the total length in its longitudinal direction is respectively formed on wall surfaces 2c and 2c in both vertical walls 2 and 2 of a long size body 4 of forming a cross section perpendicular to the axis in a substantially U shape, and a shape frozen bead 8 is respectively formed on the wall surfaces 2c and 2c of both vertical walls 2 and 2 so as not to divide a ridgeline 6a constituted of the step bead 6.

Description

  The present invention relates to a vehicle body member member of an automobile that constitutes a vehicle body skeleton component such as a side member, a cross member, a pillar, or a side sill of an automobile body.

  In general, this type of vehicle body member member has a long main body having a substantially U-shaped cross section perpendicular to the axis, and a pair of flange portions extending in the longitudinal direction at both longitudinal ends of the main body. The cross section perpendicular to the axis has a substantially hat shape.

  In recent years, the use of high-strength steel plates, usually called high-tensile materials, mainly for automobile framework members, in response to the increasing demands for automobile body collision safety and environmental protection (improving fuel efficiency through weight reduction) Is increasing.

  For this reason, a high-strength steel plate is used for a vehicle body member member that is one of the automobile skeleton members, and the high-strength steel plate is formed by press-forming the high-strength steel plate into a hat shape perpendicular to the axis.

  Thus, the body member formed of the high-strength steel plate needs to be formed by bending load while generating a certain amount of residual stress distortion during press forming. For this reason, when the body member is released from the press die after molding, the body member member is deformed due to spring back, opening or warping, etc., resulting in poor dimensional accuracy.

  In view of this point, in the prior art, both ends of the pair of vertical walls or the ends of both vertical walls of the main body formed in a hat shape perpendicular to the axis so as to form a long main body are respectively provided. A bead portion (shape frozen bead) that extends so as to cross the longitudinal axis of the main body is formed on the wall surface of the continuous horizontal wall, and deformation due to springback, mouth opening, warping, or the like is suppressed by the bead portion. Thus, the dimensional accuracy after molding has been improved.

  A vehicle body member member, for example, a side member of an automobile is installed so as to extend in the front-rear direction with respect to the vehicle body. It is made to raise and to suppress an impact.

  However, the input direction of impact force due to a collision accident on such a side member is not necessarily applied along the longitudinal axis of the side member in the vehicle body longitudinal direction. It may be a direction that intersects the direction axis, and may act as a force in a direction to bend the side member. In such a case, due to the presence of the bead portion (shape frozen bead), the side member Then, the bead portion is bent and deformed at the middle portion, and the axial tensile force cannot be sufficiently achieved, and the desired axial crushing performance cannot be exhibited.

  Therefore, in the above-described conventional technology, a shape freeze bead is provided on the wall surface of the vertical wall constituting the main body, and a step bead is provided over the entire length to add a ridge line, thereby improving the axial crushing performance. Is known (see Patent Document 1).

Japanese Patent Laying-Open No. 2005-103613 (see FIG. 8)

  However, such a conventional technique is formed so that the shape frozen bead formed on the wall surface of the vertical wall cuts a part of the ridgeline of the step bead portion, so that depending on the input direction of the impact force, the shape frozen bead In order to fully exhibit the axial crush performance based on Kalman's effective theory, complicated tuning in design such as shape dimensions is required, and such tuning is naturally limited. For this reason, in order to overcome this problem, measures such as increasing the thickness of high-strength steel sheets and adding a reinforcement with a different structure are currently being implemented. As a result of the increase in cost and cost, the advantage of adopting a high-strength steel sheet cannot be fully exhibited.

  In view of the problems in the conventional technology as described above, the present invention provides a springback and mouth due to residual stress during forming without taking measures such as increasing the thickness of a high-strength steel plate or adding a reinforcement having a different configuration. An object of the present invention is to provide a vehicle body member for an automobile capable of exhibiting desired dimensional accuracy by suppressing deformation due to opening or warping, and capable of sufficiently exhibiting axial crushing performance according to Kalman's effective theory.

  The vehicle body member of the automobile according to the present invention includes a long main body having a substantially U-shaped cross section at the right axis and a longitudinal end at each end on one end side of a pair of vertical walls constituting the main body. A vehicle body member member having a substantially hat-shaped cross section with a flange portion formed extending in a direction, and extending in a stepped manner over the entire length in the longitudinal direction on the wall surfaces of both the vertical walls. Each of the step beads is formed, and the shape freeze beads are formed on the wall surfaces of both the vertical walls so as not to divide the ridgeline formed by the step beads.

  The present invention having such a configuration exhibits desired dimensional accuracy by suppressing deformation due to residual stress at the time of molding due to residual stress at the time of molding, spring back, opening or warping, etc. by the shape freeze beads formed on the wall surfaces of both vertical walls. In addition, since the step beads are formed on the wall surfaces of both vertical walls over the entire length in the longitudinal direction and the ridge line formed by the step beads is not divided over the entire length in the longitudinal direction, The axial crushing performance can be sufficiently improved by increasing the surface rigidity of the vertical wall, and as a result, it is not necessary to take measures such as increasing the thickness of high-strength steel sheets or adding a separate reinforcement. As a result, the advantages of adopting the high-strength steel sheet can be sufficiently exhibited while suppressing an increase in the mass of the vehicle body member and an increase in cost.

  Moreover, the shape freezing bead in the present invention is, as an embodiment, at least one of the side wall side or the flange part side connecting the other end side ends of the vertical walls together with the step bead therebetween. It is formed on the side.

  In the present invention having such a configuration, there is a step bead that is not divided over the entire length formed on at least one side of the horizontal wall side or the flange side connecting the other end side ends of both vertical walls. The axial crushing performance can be sufficiently exhibited by enhancing the surface rigidity of both vertical walls according to the Kalman effective theory.

  Moreover, the shape freeze bead formed on the side wall side of the wall surface of the vertical wall according to the present invention has, as an embodiment, a bead depth size in the vicinity of the step bead, and a height of the staircase portion constituting the step bead. By setting it to 1/2 of the size, the ridgeline formed by the step bead is not divided.

  In the present invention having such a configuration, the step bead extends over the entire length by setting the bead depth size in the vicinity of the step bead of the shape freeze bead to ½ of the height dimension of the stepped portion constituting the step bead. A ridgeline exists over the entire length of the step bead without being divided, and the axial crushing performance can be sufficiently improved by increasing the surface rigidity of both vertical walls according to Kalman's effective theory.

  Moreover, the shape freeze bead formed on the wall surfaces of the vertical walls so as to extend from the step bead to the horizontal wall side in the present invention has a bead bottom surface from the step bead side to the horizontal wall side as an embodiment. It is constituted as an inclined surface in which the bead depth dimension gradually decreases as it goes.

  In the present invention having such a configuration, the bead depth dimension gradually decreases from the step bead side to the horizontal wall side of the bottom surface of the shape frozen bead formed on the wall surfaces of both vertical walls so as to extend from the step bead to the horizontal wall side. Therefore, the ridgeline formed by both vertical walls and horizontal walls is not divided, and the surface rigidity of both vertical walls can be enhanced by Kalman's effective theory to sufficiently exhibit axial crushing performance. .

  Moreover, the shape freeze bead formed in the said wall surface of both the vertical walls so that it may extend in the said flange part side rather than the said step bead in this invention is a step bead side from the said flange part side as an embodiment. It is constituted as an inclined surface in which the bead depth dimension gradually decreases as it goes to.

  In the present invention having such a configuration, the bead depth dimension increases from the flange portion side to the step bead side in the bottom surface of the shape frozen bead formed on the wall surfaces of both vertical walls so as to extend from the step bead to the flange portion side. Since the inclined surface gradually decreases, the ridge line formed by the step bead is not divided, and the axial rigidity can be sufficiently exerted by increasing the surface rigidity of both vertical walls according to the Kalman effective theory.

  Moreover, the shape freezing bead in the present invention is configured to have a convex shape toward the outside of the wall surface of the vertical wall, or a concave shape toward the outside of the vertical wall as an embodiment. Consists of.

  Moreover, the said step bead in this invention is comprised by forming in multiple strips in the said wall surface of the said both vertical walls as embodiment.

  In the present invention having such a configuration, a plurality of step beads formed on the wall surfaces of both vertical walls add a ridge line to the wall surfaces of both vertical walls, and the wall surfaces of both vertical walls according to Kalman's effective theory. Therefore, it is possible to further improve the axial crushing performance by increasing the surface rigidity.

  Moreover, the said shape freezing bead in this invention is made to form between the said step beads adjacent to each other among the said step beads formed in the said wall surface of both said vertical walls as embodiment. .

  The present invention having such a configuration can secure a degree of freedom in design to further increase the dimensional accuracy in press molding by the shape freeze bead formed between the step beads.

  Further, the shape freeze bead formed between the adjacent step beads on the wall surfaces of the both vertical walls of the present invention is formed so as not to divide the ridgeline formed by these step beads as an embodiment. May be.

  In the present invention having such a configuration, the ridgeline formed by the step bead is not divided over the entire length in the longitudinal direction by the shape frozen bead existing between the step beads, so that the surfaces on the wall surfaces of both vertical walls according to the Kalman effective theory. The rigidity can be increased and the shaft crushing performance can be sufficiently exhibited.

  According to the present invention described above, the shape freeze beads formed on the wall surfaces of both vertical walls suppress deformation due to residual stress at the time of molding due to spring back, mouth opening or warpage, etc. In addition, since the step beads are formed on the wall surfaces of both vertical walls over the entire length in the longitudinal direction and the ridge line formed by the step beads is not divided over the entire length in the longitudinal direction, The axial crushing performance can be sufficiently improved by increasing the surface rigidity of the vertical wall, and as a result, it is not necessary to take measures such as increasing the thickness of high-strength steel sheets or adding a separate reinforcement. As a result, the advantages of adopting the high-strength steel sheet can be sufficiently exhibited while suppressing an increase in the mass of the vehicle body member and an increase in cost.

It is the schematic perspective view which drawn the side member which is a vehicle body member member of the car which adopted Example 1 concerning the present invention. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. It is the schematic perspective view which drawn the side member which is the vehicle body member member of the motor vehicle which employ | adopted Example 2 which concerns on this invention. It is the schematic perspective view which drawn the side member which is the vehicle body member member of the motor vehicle which employ | adopted Example 3 which concerns on this invention. It is sectional drawing similar to FIG. 2 which drawn the side member which is a vehicle body member member of the motor vehicle which employ | adopted Example 4 which concerns on this invention. It is sectional drawing similar to FIG. 3 which drawn the side member which is a vehicle body member member of the motor vehicle which employ | adopted Example 4 which concerns on this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, a side member (generally referred to as a rear side member or the like) disposed on the vehicle body rear side of an automobile as a first embodiment which is a vehicle body member member according to the present invention will be described with reference to FIGS. 1 to 3. To do.

  The side member 1 includes a pair of vertical walls 2, 2 and a horizontal wall 3 that connects the end portions 2 a, 2 a of the vertical walls 2, 2 to each other. The main body 4 and the pair of vertical walls 2 and 2 constituting the main body 4 project outwardly at the other end side end portions 2b and 2b so as to extend in the longitudinal direction. The flange portions 5 and 5 are formed in a cross-sectional hat shape.

  The side member 1 is attached to the vehicle body 9 indicated by a two-dot chain line by spot welding or the like with the flange portions 5 and 5 as attachment portions, and constitutes a strength member having a closed cross section.

  Further, on the wall surfaces 2c and 2c of both the vertical walls 2 and 2 of the side member 1, step beads 6 and 6 are formed respectively extending in a stepped shape that protrudes outward over the entire length in the longitudinal direction. Yes.

  Further, a plurality of step beads 6, 6 on the wall surfaces 2 c, 2 c and a ridge line 7 formed by one end side ends 2 a, 2 a of the vertical walls 2, 2 and the horizontal wall 3 are arranged in the longitudinal axis direction. The shape freezing beads 8 and 8 are formed side by side.

The shape freezing beads 8 and 8 have convex shapes outward and extend on the wall surfaces 2c and 2c so as to intersect the axial direction X of the main body 4, respectively.
The bead bottom surfaces 8a and 8a of the shape frozen beads 8 and 8 are each formed as an inclined surface whose bead depth dimension gradually decreases from the step bead 6 side to the side wall 3 side. 8 is configured by setting the bead depth dimension in the vicinity of the step beads 6, 6 to ½ of the height dimension of the stepped portions 6 b, 6 b constituting the step bead 6.

  In the side member 1 of the present invention configured as described above, since the convex shaped frozen beads 8 are formed outwardly on the respective wall surfaces 2c of the vertical walls 2 and 2, the residual stress at the time of molding is determined. Therefore, it is possible to suppress deformation due to spring back, mouth opening, warping, and the like, and to exhibit desired dimensional accuracy after molding.

  At the same time, the side member 1 forms step beads 6 and 6 on the wall surfaces 2c and 2c of the vertical walls 2 and 2 over the entire length in the longitudinal direction, respectively, and in addition, in the shape frozen bead 8 and in the vicinity of the step beads 6 and 6 Since the bead depth dimension is set to ½ of the height dimension of the stepped parts 6b and 6b constituting the step bead 6, the ridge line 6a constituted by the step beads 6 and 6 is frozen. As a result of not being divided by the bead 8, it is possible to increase the surface rigidity of the two vertical walls 2 and 2 according to the Kalman theory and sufficiently improve the axial crushing performance. As a result, the high strength steel plate that is the material of the side member 1 As a result, it is not necessary to take measures such as increasing the plate pressure or adding a reinforce with a different configuration. Benefits would be to be able to fully demonstrate that.

  Moreover, the side member 1 is formed with the vertical walls 2 and 2 and the horizontal wall 3 because the shape frozen bead 8 is formed on an inclined surface in which the bead depth dimension gradually decreases from the step bead 6 side to the horizontal wall 3 side. The ridge line 7 to be cut is not divided, and also from this point, the axial crushing performance can be improved by increasing the surface rigidity of the vertical walls 2 and 2 according to the Kalman theory.

  Next, Embodiment 2 according to the present invention will be described with reference to FIG.

  The side member 1 according to the second embodiment shown in FIG. 4 has step beads 6 and 6 in which the shape freezing beads 8 protrude outwardly on the respective wall surfaces 2c and 2c, and the other end 2b of the vertical walls 2 and 2. The ridgeline 7a formed by the flange portions 5 and 5 has the same configuration as that of the first embodiment except that a plurality of the ridgelines 7a are arranged in the longitudinal axis direction.

  The shape-freezing bead 8 also has a convex shape outward and extends to the wall surfaces 2c and 2c so as to intersect the axial direction X of the main body 4, and the bead bottom surface 8a. , 8a are formed on inclined surfaces in which the bead depth dimension gradually decreases from the flange portion 5 side to the step bead 6 side, and the shape freeze beads 8, 8 are in the vicinity of the flange portions 5, 5 The bead depth dimension is set to ½ of the height dimension of the flange portions 5 and 5.

  In the side member 1 according to the second embodiment, in addition to the configuration of the side member 1 according to the first embodiment, the shape freeze bead 8 is replaced with the step beads 6 and 6 on the wall surfaces 2c and 2c and the other end side of the vertical walls 2 and 2 respectively. By forming between the end 2b and the ridge line 7a formed by the flanges 5 and 5, it is possible to suppress deformation due to residual stress at the time of molding due to springback, opening or warping, etc. Further improvement in dimensional accuracy can be expected.

  In addition, since the shape freeze bead 8 is formed to have an inclined surface in which the bead depth is gradually reduced from the flange portion 5 side to the step bead 6 side, the step bead 6 is configured. The ridgeline 6a formed by the material is not divided over the entire length in the longitudinal direction, and the axial crushing performance can be further improved by increasing the surface rigidity of the wall surfaces of both the vertical walls according to the Kalman effective theory. .

  Next, Embodiment 3 according to the present invention will be described with reference to FIG.

  The side member 1 according to the third embodiment shown in FIG. 5 should be referred to as a modification of the second embodiment shown in FIG. 4, and in addition to the step beads 6, the step beads are provided on the wall surfaces 2 c and 2 c of the vertical walls 2 and 2. 6 and a ridge line 7a on the flange portion 5 side, a step bead 6-2 extending outwardly in the longitudinal direction is further formed, and a wall surface between the step bead 6 and the step bead 6-2 2c, a plurality of shape freeze beads 8 are formed side by side in the longitudinal axis direction. The shape freeze beads 8 have a bead depth as the bottom surface of the beads goes from the step bead 6-2 side to the step bead 6 side. The bead depth dimension in the vicinity of the step bead 6-2 is 1 of the height dimension of the stepped portion 6-2b constituting the step bead 6-2. Except that constitute set to 2, it has the same configuration as the configuration of the second embodiment.

  Therefore, the side member 1 according to the third embodiment includes, in addition to the configuration of the second embodiment, the shape freeze bead 8 with the ridge line 6a of the step bead 6 and the ridge line 6-2a of the step bead 6-2 on each of the wall surfaces 2c and 2c. By forming between them, it is possible to suppress deformation due to springback, opening or warping due to residual stress during molding, and further improvement in desired dimensional accuracy after molding can be expected.

  In addition, since the shape freeze bead 8 is formed on an inclined surface whose bead depth is gradually reduced from the step bead 6-2 side to the step bead 6 side, the step bead 6 is formed. Therefore, the ridgeline 6a is not divided over the entire length in the longitudinal direction, and the surface rigidity of the wall surfaces of the two vertical walls can be increased by Kalman's effective theory to further improve the axial crushing performance.

  Furthermore, since the bead depth dimension in the vicinity of the step bead 6-2 is set to ½ of the height dimension of the stepped portion 6-2b of the step bead 6-2, the step bead 6− The ridge line 6-2a formed by 2 will not be divided over the entire length in the longitudinal direction, and the axial crushing performance can be further improved by increasing the surface rigidity of the walls of both vertical walls according to the Kalman effective theory. It will be.

  Next, Embodiment 4 according to the present invention will be described with reference to FIGS.

  The side member 1 according to the fourth embodiment shown in FIGS. 6 and 7 is a modification of the first embodiment. In the first embodiment, the side member 1 is formed in a convex shape toward the outside, whereas the side member 1 is outward. Although different in that it has a concave shape, it has the same configuration in other respects.

  In the side member 1 of the present invention configured as described above, since the concave shape frozen beads 8 are formed on the respective wall surfaces 2c of the vertical walls 2 and 2, the spring back and the mouth opening due to the residual stress at the time of molding are formed. Or the deformation | transformation by curvature etc. can be suppressed and desired dimensional accuracy can be exhibited after shaping | molding.

  At the same time, the side member 1 forms step beads 6 and 6 on the wall surfaces 2c and 2c of the vertical walls 2 and 2 over the entire length in the longitudinal direction, respectively, and in addition, in the shape frozen bead 8 and in the vicinity of the step beads 6 and 6 Since the bead depth dimension is set to ½ of the height dimension of the stepped portions 6b and 8b constituting the step bead 6, the ridge line 6a constituted by the step beads 6 and 6 is frozen. As a result of not being divided by the bead 8, it is possible to increase the surface rigidity of the two vertical walls 2 and 2 according to the Kalman theory and sufficiently improve the axial crushing performance. As a result, the high strength steel plate that is the material of the side member 1 As a result, it is not necessary to take measures such as increasing the plate pressure or adding a reinforce with a different configuration. Benefits would be to be able to fully demonstrate that.

  In the above embodiment, the step beads 6 or 6-2 are both formed in a stepped shape protruding outward with respect to the wall surface 2c of the vertical wall 2. However, the present invention is not limited to this. Alternatively, it may be formed in a stepped shape that protrudes inward.

  As described above, the present invention exhibits desired dimensional accuracy by suppressing deformation due to residual stress at the time of molding due to residual stress at the time of molding, spring opening, warping or warping by the shape freeze beads formed on the wall surfaces of both vertical walls. After all, the step beads are formed over the entire length in the longitudinal direction on the walls of both vertical walls, and the ridge line formed by the step beads is not divided over the entire length in the longitudinal axis direction. The axial crushing performance can be sufficiently improved by increasing the surface rigidity of both vertical walls according to the effective theory, and as a result, it is necessary to take measures such as increasing the thickness of high-strength steel sheets and adding a reinforcement of another configuration. As a result, the advantages of adopting high-strength steel sheets can be fully demonstrated while suppressing the increase in mass and cost of the body member members. .

Therefore, the present invention is suitable for a vehicle body member member of a vehicle that constitutes a vehicle body skeleton component such as a side member, a cross member, a pillar, or a side sill of a vehicle body.

1 Side member (body member)
2 vertical wall 2a one end side end 2b other end side end 2c wall surface 3 horizontal wall 4 body 5 flange portion 6, 6-2 step bead 6a, 6-2a ridgeline 6b, 6-2b stepped portion 7, 7a ridgeline 8 Shape Freezing Bead 8a Bottom

Claims (10)

A long main body having a cross section perpendicular to the axis substantially formed in a U-shape, and a flange portion extending in the longitudinal direction at each end on one end side of a pair of vertical walls constituting the main body. A vehicle body member member having a substantially hat-shaped cross section, wherein step beads are formed on the wall surfaces of the two vertical walls in a stepwise manner over the entire length in the longitudinal direction. A car body member member for an automobile, wherein shape freeze beads are formed on the wall surfaces of the vertical walls so as not to divide the ridge line to be cut. The shape-freezing bead is formed on at least one side of the lateral wall side or the flange portion side connecting the other end side ends of the wall surfaces of the vertical walls together with the step beads interposed therebetween. The vehicle body member member of the automobile according to claim 1. The shape freeze bead formed on the side wall side of the wall of the vertical wall is set by setting the bead depth size in the vicinity of the step bead to ½ of the height dimension of the stepped portion constituting the step bead. 4. The vehicle body member according to claim 3, wherein the ridgeline formed by the step beads is not divided. The shape frozen bead formed on the wall surfaces of the vertical walls so as to extend from the step bead to the horizontal wall side gradually decreases in the bead depth dimension as the bead bottom surface goes from the step bead side to the horizontal wall side. The vehicle body member member for an automobile according to any one of claims 2 to 4, wherein the member is an inclined surface. The shape frozen bead formed on the wall surfaces of the two vertical walls so as to extend from the step bead to the flange portion side has a bead depth dimension gradually decreasing from the flange portion side to the step bead side. 5. The vehicle body member member for an automobile according to any one of claims 2 to 4, characterized in that the inclined surface is reduced. 6. The vehicle body member according to claim 1, wherein the shape-freezing bead has a convex shape toward the outside of the wall surface of the vertical wall. 6. The vehicle body member according to claim 1, wherein the shape freeze bead has a concave shape toward the outside of the wall surface of the vertical wall. The vehicle body member according to any one of claims 1 to 7, wherein a plurality of the step beads are formed on the wall surfaces of the two vertical walls. 9. The vehicle body member according to claim 8, wherein the shape freezing bead is formed between the step beads adjacent to each other on the wall surfaces of the two vertical walls. The automobile according to claim 9, wherein the shape freeze beads formed between the step beads adjacent to each other on the wall surfaces of the two vertical walls are formed so as not to divide a ridge line formed by the step beads. Car body member.

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