Technical field
[0001]The present invention relates to a structural member for an automobile.
BACKGROUND
[0002]Body of an automobile is constituted by various structural members. Many of the structural member is formed by press-molding a steel plate. To increase the collision safety performance, with respect to the structural member of the vehicle (especially elongated members), various proposals have been made conventionally.
[0003]
　For example, (JP 2011-178327) Patent Document 1, Patent Document 2 (JP 2013-189173), Patent Document 3 (JP 2014-087848), and Patent Document 4 (JP-2011 -067841 discloses) discloses a technique for reinforcing a structural member used in automobiles.
[0004]
　Patent Document 1 discloses a frame structure including a frame body of the tubular. The inner corner portions of the frame body, the reinforcing member is attached.
[0005]
　Patent Document 2 discloses a structural member including a first molded body and a second molded body (reinforcing member). The first molded body has a hat-shaped cross section, the second molded body has a channel-shaped cross-sectional shape. Patent Document 2, the inner or outer surface of the first molded body, a second molding body (reinforcing member) is structural member that is joined is disclosed.
[0006]
　Patent Document 3 discloses a molding member having a ridge portion connecting the one surface and the other one face. The ridge line portion, the reinforcing member is bonded. Patent Document 3 discloses a reinforcing member having the same shape as the ridge line portion.
[0007]
　Patent Document 4, a top wall portion, a vertical wall portion connected with the respective ends of the top wall, and discloses a structure member to form a hollow cross section with a bottom wall portion. The connection region between the top wall and the vertical wall portion, projecting portion projecting outward is provided.
CITATION
Patent Document
[0008]
Patent Document 1: JP 2011-178327 Patent Publication
Patent Document 2: JP 2013-189173 Patent Publication
Patent Document 3: JP 2014-087848 Patent Publication
Patent Document 4: JP 2011-067841 JP
Summary of the Invention
Problems that the Invention is to Solve
[0009]
　By using the characteristic high structural member in a three-point bending test, a car to enhance the collision safety performance of motor vehicles it is possible or lighter. Therefore, currently, characteristics in three-point bending test is demanded a higher new structural member. In such circumstances, an object of the present invention is that the properties of the three-point bending test to provide a high structural member.
Means for Solving the Problems
[0010]
　Structural member according to an embodiment of the present invention is a structural member for an automobile. The structural member includes a single press-formed article formed from the steel sheet, and a reinforcing member that is fixed to the press-molded product. The press molded product includes a top plate connecting the two vertical wall portions the two vertical wall portions. The reinforcing member includes a first plate-shaped portion and a second plate-shaped portion is a member of the cross section L-shaped. Wherein the first plate-shaped portion so that the along the top plate portion and the second plate-shaped portion projects from said vertical wall portion toward the outside direction is fixed to the vertical wall portion.
The invention's effect
[0011]
　According to the present invention, characteristics in three-point bending test is high structural member obtained. By using the structural member according to the present invention, the motor vehicle to enhance the collision safety performance of motor vehicles it is possible or lighter.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012]
[1] Figure 1 is a perspective view schematically showing an example of a structural member of the present embodiment.
FIG. 2 is a cross-sectional view of the structure member shown in FIG.
FIG. 3 is a cross-sectional view schematically showing another example of a structural member of the present embodiment.
[4] FIG. 4 is a cross-sectional view schematically showing another example of a structural member of the present embodiment.
FIG. 5 is a projection view of a structural member shown in FIG.
[Figure 6A] Figure 6A is a perspective view schematically showing another example of a structural member of the present embodiment.
[Figure 6B] Figure 6B is a perspective view schematically showing another example of a structural member of the present embodiment.
[Figure 7A] Figure 7A is a perspective view schematically showing another example of a structural member of the present embodiment.
[Figure 7B] Figure 7B is a cross-sectional shape of the reinforcing member of this embodiment is a sectional view of a U-shape.
[Figure 7C] Figure 7C is a cross-sectional shape of the reinforcing member of this embodiment is a sectional view of a triangular shape.
[Figure 7D] FIG. 7D is a cross-sectional view of the cross-sectional shape of the reinforcing member of this embodiment is a square shape.
[FIG. 8A] Figure 8A is a cross-sectional view showing the structure of the sample 3 of the present invention examples used in Examples schematically.
[Figure 8B] Figure 8B is a cross-sectional view showing the structure of the sample 1 of the comparative example used in Example schematically.
[Figure 8C] Figure 8C is a sectional view showing a structure of a sample 2 of the comparative example used in Example schematically.
[Figure 8D] Figure 8D is a cross-sectional view showing the structure of the sample 4 of the comparative example used in Example schematically.
[9] FIG. 9 is a diagram schematically showing a three-point bending test conditions in Example.
[10] FIG 10 is a graph showing an example of the results of Example 1.
[11] FIG 11 is a graph showing another example of the results of Example 1.
[12] FIG 12 is a graph showing another example of the results of Example 1.
[13] FIG 13 is a graph showing another example of the results of Example 1.
[Figure 14A] Figure 14A is a cross-sectional view showing the state of deformation of the sample 1 in the three-point bending test of Example 1.
FIG 14B] FIG 14B is a cross-sectional view showing the state of deformation of the sample 2 in the three-point bending test of Example 1.
FIG 14C] FIG 14C is a sectional view showing the state of deformation of the sample 3 in a three point bending test of Example 1.
[15] FIG 15 is a graph showing another example of the results of Example 1.
[16] FIG 16 is a graph showing another example of the results of Example 1.
[17] FIG 17 is a graph showing another example of the results of Example 1.
[18] FIG 18 is a graph showing another example of the results of Example 1.
[19] FIG 19 is a graph showing another example of the results of Example 2.
[20] FIG 20 is a graph showing another example of the results of Example 2.
[21] FIG 21 is a graph showing another example of the results of Example 2.
[22] FIG 22 is a graph showing another example of the results of Example 2.
[23] FIG 23 is a graph showing another example of the results of Example 2.
[24] FIG 24 is a graph showing another example of the results of Example 2.
DESCRIPTION OF THE INVENTION
[0013]
　As a result of intensive studies, the inventors have, depending on the particular structure, characteristics in three-point bending test was newly found that improved. The present invention is based on this new finding.
[0014]
　Hereinafter, embodiments of the present invention will be described. As will be described by way of example embodiments of the present invention in the following description, the present invention is not limited to the examples described below. In the following description, there is a case to illustrate specific numerical values ​​and materials, as long as the effects of the present invention are obtained, may be applied other numerical values ​​and materials. In this specification, the term "cross section" is, unless otherwise indicated, it means a cross-section perpendicular to the direction (longitudinal direction) of the press-molded product (P) extends.
[0015]
　(Structural member for an automobile)
　structural member of the present embodiment is a structural member for an automobile. The structural member includes a press-molded article formed from a sheet of steel plate, and a reinforcing member that is fixed to the press-molded product. Each of these press-moldings and the reinforcing member, sometimes referred to as "press-molded product (P)" and "reinforcing member (R)." Furthermore, the structural members of the present embodiment may be referred to as "structural member (S)."
[0016]
　Press-molded product (P) includes two vertical wall portions, and a top plate connecting the two vertical wall portions. A reinforcing member (R) is a member including a first plate portion and a second plate-shaped portion is a member of the cross section L-shaped. The second plate-shaped portion along the top plate portion so as to protrude outward from the vertical wall portion, the first plate-like portion is fixed to the vertical wall.
[0017]
　Press-molded product (P) can be formed by deforming one steel sheet (steel sheet). Section of the press-molded product (P), the bottom may comprise a substantially flat U-shaped portion. If the press-molded product (P) includes a flange portion to be described later, it may be the cross-section substantially hat shape.
[0018]
　From the viewpoint of the collision safety and weight reduction, it preferably has high tensile strength of the steel plate constituting a press molded article (P). Or tensile strength of the steel sheet is 340 MPa (e.g., 490 MPa or higher, 590 MPa, or more 780 MPa, or more 980 MPa, or 1200MPa or higher) may be. There is no limitation on the upper limit of the tensile strength, it may be not more than 2000 MPa.
[0019]
　Usually, the press-molded product (P) as a whole has an elongated shape. The vertical wall portion, the top plate portion, and the later-described flange portion, both extending in the longitudinal direction of the press-molded product (P). A reinforcing member (R) may be be arranged over the entire longitudinal direction of the press-molded product (P), it may be disposed only on a part of the longitudinal direction of the press-molded product (P).
[0020]
　Hereinafter, the two vertical wall portions, an imaginary surface connecting the ends of the two vertical wall portions, and the area surrounded by the top plate may be referred to as "inner press-molded product (P)". Furthermore, with the inner sides of the vertical wall and the top plate in some cases the opposite side is referred to as "outside of the press-molded product (P)". Further, a direction away from the inside of the press-formed product (P), it may be referred to as "outward direction".
[0021]
　Top plate connects the two vertical wall portions. More specifically, the vertical wall portion and the top plate, are continuous through the ridge (corner). In another aspect, the top plate is a horizontal wall portion connecting the two vertical wall portions. Therefore, in this specification, it is possible to read as the top plate portion and the lateral wall portion. When placing the press-formed product (P) toward the lateral wall portion (top plate) downwards and can also be referred to as a bottom plate portion of the lateral wall portion. However, in this specification, reference to the case of arranging the lateral wall portion upward, referred to as the top plate portion of the lateral wall portion.
[0022]
　Angle Y formed by the top plate portion and the vertical wall portion is typically, 90 ° or near. Angle Y is may be less than 90 °, usually greater than 90 °, may be in the range of 90 ° ~ 0.99 °. Two angles Y may be different, may be substantially the same (difference therebetween within 10 °). The angle Y will be described in FIG.
[0023]
　The first plate-shaped portion, the side where the second plate-shaped portion are connected is fixed to the press-formed product (P) so as to be positioned above (top plate side). The first plate portion of the reinforcing member (R) is not limited to the method of fixing the press-molded product (P), may be selected fixing method according to the situation. The first plate-like portion is welded, adhesive, brazing, rivets, and may be fixed to the press-formed product (P) by at least one member selected from the group consisting of friction stir welding. Examples of welding include resistance spot welding and laser welding. Of the fixed portion, the shape, range, and number, etc., may be appropriately selected depending on the situation. Regarding the position of the fixed portion, it is preferable as close as possible to the top plate side as possible. By fixing at a position close to the top plate portion side, the first plate-shaped portion is due to susceptible moment to press the vertical wall portion of the press-molded product inside. Of the first plate-shaped portion, a portion in contact with the vertical wall portion of the press-molded product when the plane C, the center position of the fixed portion, the second plate-shaped portion near the side of the half plane C there it is preferable. Incidentally, the joint may have to break upon impact modified with respect to the fixing strength.
[0024]
　The top plate and the second plate-shaped portion typically parallel to. However, it may be inclined a second plate-shaped portion with respect to the top plate portion. Angle X formed between the top plate and the second plate-shaped portion may be in the range of 150 ° ~ 200 °. This angle, the following may be referred to as "angle X". Angle X is, for example, 180 ° or less. Preferably, the angle X is 150 ° ~ 180 °. The angle X described in FIG.
[0025]
　In the reinforcing member (R), by a first plate portion and the second plate-shaped portion, the shape is formed to have an L-shaped cross-section. Angle Z formed between the first plate-shaped portion and the second plate-shaped portion may be in the range of 70 ° ~ 120 °. Preferably, the angle Z is 80 ° ~ 100 °. The angle Z is an angle determined corresponding to the angle X, the angle Y. The angle Z will be described in FIG.
[0026]
　In the cross section of the reinforcing member (R), the corners of the first plate-shaped portion the boundary between the second plate-shaped portion is preferably rounded. By the rounded shape of the corner portion can be suppressed plastic deformation due to stress concentration on the corner portion of the reinforcing member at the time of collision. In the cross section of the reinforcing member (R), the radius of curvature of the corner portion may be in the range of 1.0 mm ~ 15.0 mm.
[0027]
　Longitudinally and first plate portion reinforcing in a direction parallel to the member by a vertical (R) the length and width W1. Further, the length in the longitudinal direction of the reinforcement in a direction parallel to the top plate portion in the vertical member (R) and the width W2. As long as the effects of the present invention is obtained, the value of the ratio W1 / W2 of the width W1 and the width W2 may be in the range of 0.5-2. Preferably, the value of W1 / W2 is in the range of 0.7-1.4. The width W1 and the width W2, is described in Figure 8A.
[0028]
　Width W1 may be of 2.5mm or more. Preferably, the width W1 is at 5mm or more, more preferably, the width W1 is 7.5mm or more. No particular limitation on the upper limit of the width W1, but if too large width W1, characteristics per unit mass decreases. Width W1 may be of 30mm or less.
[0029]
　Width W2 may be of 5mm or more. Preferably, the width W2 is not 10mm or more, more preferably, the width W2 is 15mm or more. No particular limitation on the upper limit of the width W2, but if too large width W2, characteristics per unit mass decreases. Width W2 may be of 30mm or less.
[0030]
　A reinforcing member (R) may be fixed only to the press-molded product (P). That is, the reinforcing member (R) may not be fixed to a member other than the press-molded product (P). This is the same even when the structural member (S) is used in an automobile. That is, in the vehicle including a structural member (S) of the present embodiment, the reinforcing member (R) may be fixed only to the press-molded product (P).
[0031]
　In structural members of the present embodiment (S), the cross section of the boundary between the vertical wall portion and the top plate may be rounded rounded shape. In that case, the top plate portion side from the start position of the shape rounded at the vertical wall portion, the second plate-shaped portion may be disposed. According to this configuration, it is possible to vertical wall portion is prevented from falling to the outside by the impact from the top plate side. By suppressing the vertical wall portion falling outside, it is believed possible to improve the characteristics in the event of an impact against the top plate portion.
[0032]
　Here, assume a first plane including the top plate. Further, assume a second plane parallel to the first plane passes through the starting position of the shape rounded at the vertical wall portion. The second plate-shaped portion, the first plane, between the first and second planes, and may be disposed composed region in a second plane. For example, the second plate-shaped portion may be on the first plane and the same plane. According to this configuration, it is possible to vertical wall portion is prevented from falling to the outside by the impact from the top plate side.
[0033]
　Distance D between the first plane and the second plate-shaped portion including a top plate may be in the range of 0 mm ~ 20 mm. The distance D, and described in FIG.
[0034]
　In structural members of the present embodiment (S), when projected structural members from the side, the projection area of ​​the reinforcing member (R) may be present within the projection area of ​​the press-molded product (P). The "within the projection area of ​​the press-molded product (P)" includes the outer edge portion of the projection area of ​​the press-molded product (P). The meaning of the projection from the side, will be described in FIG.
[0035]
　A reinforcing member (R) may be a one which is made of a metal plate that can be used as a reinforcing member may be made of other materials that can be used as the material of the reinforcing member. Metal plate may be a steel plate, or a plate made of another metal material such as aluminum. That is, the reinforcing member (R) may be made of steel. A steel sheet that constitutes the reinforcing member (R) can be used exemplified steel as steel plate constituting a press molded article (P). An example of a reinforcing member (R) is formed by press-molding a steel plate.
[0036]
　Structural members of the present embodiment (S), the reinforcing member (R) may contain two. In this case, the reinforcing member (R) is fixed to each of the two vertical wall portions. According to this configuration, it is possible to further improve the characteristics in three-point bending test. An example of a structural member of the present embodiment (S), the reinforcing member (R) includes only one reinforcing member (R) is fixed only on one of the vertical wall portion. The width W2 of the two reinforcing members may be different.
[0037]
　Press-molded product (P) may comprise two flanges extending from the ends of the two vertical wall portions. Structural members of the present embodiment (S) may further comprise other member made of a steel plate. The other member, in the following, sometimes referred to as "another member (M)" or "member (M)". As the press-molded product (P) and the other member (M) constitutes a closed cross section, another member (M) may be fixed to the two flanges of the press-molded product (P). That is, press-molded product (P) and the member (M) may constitute the hollow body. According to this configuration, it is possible to further improve the characteristics in three-point bending test.
[0038]
　Member (M) may be a metal plate, may be, for example, steel. Member (M) may be formed of a steel plate of the steel plate of the same kind which constitute press-molded article (P). Member (M) may be a plate-like member as called back plate, may be a molded product press-molded. For example, member (M) may have press-molded product (P) the shape of the same type with two flanges. In that case, it can be fixed and two flange portions of the press-molded product (P), and two flange portions of the members (M).
[0039]
　In structural members of the present embodiment (S), to enhance the effect of the reinforcing member (R), a reinforcing member (R) and the press-molded product (P) and preferably satisfies the following formula (1).
　× [press molding Tensile strength of the reinforcing member (R) (MPa)] [plate thickness of the reinforcing member (R) (mm)] × × 0.8 ≧ [ thickness (mm) of the press-molded product (P)] the tensile strength of the goods (P) (MPa)] ··· (1)
[0040]
　Briefly, the formula (1), the strength of the reinforcing member (R) is meant that it is preferable somewhat high. When the left-hand side of equation (1) is smaller than the right side, the strength of the reinforcing member (R) is significantly lower than the press-molded product (P), in the event of a collision from the top plate portion side, vertical wall of the press-molded product part less likely to defeat the inside.
[0041]
　Structural members of the present embodiment (S) is a bumper beam, a side sill, a center pillar, A-pillar, roof rails, door impact beams, may be a beltline reinforcement or roof arch. Alternatively, the structural member (S) may be used as the other structural members for automobiles. Structural member (S) may be a component of bending deformation at the time of collision.
[0042]
　Structural members of the present embodiment (S), in addition to the reinforcing member (R) may include other reinforcing member. For example, along the inner corner portion of the press-molded product (P) (the corners of the boundary between the top plate portion and the vertical wall portion), fixed to the cross section L-shaped reinforcing member is press-molded product (P) it may be.
[0043]
　There is no particular limitation to the method for producing a structural member of the present embodiment (S), it can be prepared by known methods. For example, the press-molded product (P) and the reinforcing member (R) may be formed by a known press molding. Even if another member (M) is a press-molded product can be similarly formed by a known press molding. The method of fixing them, can be applied a method as described above. Structural members of the present embodiment (S) can be realized only by fixing the reinforcing member (R) from the outside of the existing press-molded product (P). Therefore, the structural member (S) is easy to manufacture.
[0044]
　The following description with reference to the accompanying drawings, embodiments of the present invention. The embodiments described below are exemplary, at least a portion of the configuration in the following embodiment, can be replaced with the above-described configuration. In the following description, it may be omitted from redundant explanation are denoted by the same reference numerals to like parts. In the following, referred to above (top plate side) in FIG. 2 and the upper structural member (S), may be referred to a lower (flange portion) in FIG. 2 and the lower structural member (S).
[0045]
　(Structure example of members (S))
　a perspective view of an example the structural members of the present embodiment (S), is schematically illustrated in FIG. Structural member 100 of Figure 1 includes a press-molded product 110, and two reinforcing members 120 fixed to the press-molded product 110. Press-molded product 110 is an example of the above-described press-molded product (P). Reinforcing member 120 is an example of the above-described press-reinforcing member (R).
[0046]
　The cross section of the structural member 100 (section perpendicular to the longitudinal direction of the structural member 100), schematically illustrated in FIG. Press-molded product 110 includes two vertical wall portions 111, and a top plate portion 112 connecting the two vertical wall portions 111. In the following, there is a case where the ridge line portion of the boundary between the vertical wall portion 111 and the top plate portion 112, referred to as corner portions 113. Press-molded product 110 further comprises two flanges 114 extending from the ends of the two vertical wall portions 111. As shown in the following example, the flange portion 114, the other member (M) may be fixed. In the example shown in FIG. 2, the two flanges 114, from the lower end of two vertical wall portion 111, and extends substantially horizontally outwardly. That is, the flange portion 114 is substantially parallel to the top plate portion 112.
[0047]
　Reinforcement member 120 includes a first plate-shaped portion 121 and a second plate-shaped portion 122. Cross-section of the reinforcement member 120 (the cross section perpendicular to the longitudinal direction of the reinforcement member 120) is L-shaped. The first plate portion 121 is fixed to the vertical wall 111 by the method described above (welding and other methods). Here, the second plate-shaped portion 122, along the top plate 112 and protrudes from the vertical wall portion 111 side toward the outside direction (horizontal direction). As the second plate-shaped portion 122 is disposed in this manner, the first plate-shaped portion 121 is fixed to the vertical wall 111. In the following figures, it may indicate the first plate-shaped portion 121 and the vertical wall portion 111 and the fixed portion 118 (and the fixing unit 119 to be described later) schematically.
[0048]
　As the corners of the boundary between the first plate-shaped portion 121 and the second plate-shaped portion 122 (ridge) 123 is disposed on the top plate 112 side, the first plate-shaped portion 121 is vertical wall part It is fixed to 111. As a result, in proximity to the second plate-shaped portion 122 and the top plate portion 112.
[0049]
　Reinforcing member 120 is not fixed to a member other than the press-molded product 110. That is, the reinforcing member 120 is fixed only to the press-molded product 110.
[0050]
　Fixed portion 118 of the first plate-shaped portion 121 and the vertical wall portion 111, from being provided at a position closer to the top plate 112 (position load is input) is preferred. As the fixing portion 118 is close to the top plate 112, the first plate-shaped portion 121 is because the susceptible moment to press the vertical wall portion 111 of the press-molded product 110 inside.
[0051]
　A cross-sectional view of another example of the structural member 100 is schematically shown in FIG. In Figure 3, it shows an example in which another member 130 to the flange portion 114 is fixed. Other members 130 is an example of another member as described above (M). Further, in FIG. 3, the angle X formed by the top plate portion 112 and the second plate-shaped portion 122, an example not 180 °. The flange portion 114 and the member 130 are fixed by the fixing unit 119.
[0052]
　As shown in FIG. 3, the angle X has a planar 112s including top plate portion 112, of the angle between the plane 122s including the second plate-shaped portion 122 is an angle shown in FIG. More specifically, of the angle between the plane 112s and the plane 122s, 3, it is an angle positioned above the top plate 112 and second plate portion 122. Angle X may be in the aforementioned range.
[0053]
　Incidentally, if there is unevenness in the top plate 112, the main plane of the top plate portion (this plane is a virtual plane substantially parallel to a plane connecting the end portion of the vertical wall portion), a top plate 112 can be regarded as a plane 112s include.
[0054]
　Figure 3 shows the angle Y formed between the vertical wall portion 111 and the top plate portion 112. Angle Y, among the angles formed by the vertical wall portion 111 and the top plate portion 112, is an inner angle of the press-molded product 110. Angle Y may be in the aforementioned range.
[0055]
　Further, in FIG. 3, showing the angle Z formed between the first plate-shaped portion 121 and the second plate-shaped portion 122. Angle Z, of the angle between the first plate-shaped portion 121 and the second plate-shaped portion 122 is a smaller angle. Angle Z may be in the range described above.
[0056]
　An example enlarged view of a portion of the structural member 100 shown in FIG. Figure 4 is a cross-sectional view showing the vicinity of the corner 113.
[0057]
　In the example shown in FIG. 4, the second plate-shaped portion 122 is located below (the end side of the vertical wall portion 111) than the top plate portion 112. The cross section of the corner portion 113 at the boundary between the vertical wall portion 111 and the top portion 112 has a rounded shape rounded between two start positions 113a and 113b. Start position 113a of the rounding shape is the start position of the vertical wall portion 111 side, the start position 113b is the start position of the top plate portion 112 side. In the example shown in FIG. 4, the top plate 112 side from the start position 113a rounding shape at the vertical wall portion 111, the second plate-shaped portion 122 is disposed.
[0058]
　The cross section of the corner portion 123 and the first plate-shaped portion 121 at the boundary between the second plate-shaped portion 122 has a rounded shape rounded between two start positions 123a and 123b. The start position 123a of the rounding shape is the start position of the first plate portion 121 side (R stoppage), start position 123b is the start position of the second plate portion 122 side (R stoppage).
[0059]
　Here, the plane including the top plate portion 112 and the first virtual plane 112s. Further, a plane parallel to the street top plate portion 112 a start position 113a to the second virtual plane 113As. As shown in FIG. 4, the second plate-shaped portion 122, identical to the first virtual plane 112s, or that it is placed on the virtual plane 113as side than preferred. In addition, the second plate-shaped portion 122 is preferably disposed in the top plate 112 side of the second virtual plane 113As. When the press-molded product 110 is a structural member for an automobile, the curvature radius of the corner portion 113 of the press-molded product 110 is often at 20mm or less. Preferably, therefore, the first virtual plane 112s and the distance D between the second plate-shaped portion 122 is 20mm or less.
[0060]
　Furthermore, the start position 123a of the rounded shape of the corner portion 123 of the reinforcement member 120 is preferably disposed on the second virtual plane 113As. According to this arrangement, the following effects can be obtained. When a load is applied from the top plate 112 side, the corner portion 113 of the press-molded product 110 to deform outward direction. However, the outer corner portion 113 of the press-molded product 110, the corner portions 123 of the reinforcing member 120 is present. Therefore, deformation toward the outside direction of the corner portion 113 of the press-molded product 110 is suppressed by the corner portions 123 of the reinforcing member 120. Thus, the vertical wall portion 111 of the press-molded product 110 is less likely to deform in the outward direction, the vertical wall portion 111 is easily collapse inwardly.
[0061]
　To obtain this effect, the second plate-shaped portion 122 of the reinforcement member 120 is preferably closer to the first virtual plane 112s. In other words, the first virtual plane 112s and the distance D between the second plate-shaped portion 122, it is preferably close to 0. If the distance D is 0, the entire region of the corners 113 of the press-molded product 110 is opposed to the corner portion 123 of the reinforcing member 120. Therefore, when a load is applied from the top plate portion 112 side, easily suppress the deformation of the outward direction of the corner portion 113 of the press-molded product 110.
[0062]
　The distance D is preferably 0 ~ 10 mm, more preferably 0 ~ 5 mm, more preferably 0 ~ 3 mm, and most preferably 0 ~ 1 mm. As the distance D is shorter, it is possible reinforcing member 120 at the time of a collision is in contact with the early collision object (impactor). This makes it possible to the vertical wall portion 111 causes an early force pushing the vertical wall portion 111 inside out by the reinforcing member 120 before falling to the outside, thereby improving the crashworthiness characteristics.
[0063]
　The curvature radius of the corner portion 123 of the reinforcement member 120 is preferably greater than 5% of the overall length at the cross section of the reinforcing member 120. Curvature of the corner portion 123 radius, not more than 5% of the overall length at the cross section of the reinforcement member 120, the corner portion 123 becomes sharp. Stress concentration is likely to occur when the corners 123 is in contact with the corner portion 113 of the press-molded product 110. From the viewpoint of relieving the stress concentration, the preferred lower limit of the curvature radius of the corner portion 123 of the reinforcement member 120 is greater than 5% of the overall length at the cross section of the reinforcing member 120.
[0064]
　The curvature radius of the corner portion 123 of the reinforcement member 120 is preferably less than 50% of the overall length at the cross section of the reinforcing member 120. Curvature of the corner portion 123 radius, if at least 50% of the total length in the cross section of the reinforcement member 120, the length in the cross section of the first plate portion 121 and the second plate-shaped portion 122 of the reinforcing member 120 It is difficult to sufficiently secure of. Therefore, a preferred upper limit of the curvature radius of the corner portion 123 of the reinforcement member 120 is 50% of the overall length at the cross section of the reinforcing member 120.
[0065]
　Speaking the curvature radius of the preferred range of the corner portion 123 of the reinforcement member 120 in more detail, when the press-molded product 110 is a structural member for a motor vehicle, the curvature radius of the corner portion 123 of the reinforcement member 120, than 3mm greater is preferable. The curvature radius of the corner portion 123 of the reinforcement member 120 is preferably less than 10 mm.
[0066]
　Incidentally, been described cross section of the corner portion 123 of FIG. 4, the reinforcing member 120 is rounded shape. However, the cross section of the corner portion 123 of the reinforcement member 120 includes a start position 123a and 123b of the rounded shape may be a shape which is connected by a straight line. In this case, the length of the linear portion of the corner portion 123 in cross section is preferably greater than 5% of the overall length at the cross section of the reinforcement member 120, less than 50% of the overall length at the cross section of the reinforcement member 120 it is preferable that. When the press-molded product 110 is a structural member for a motor vehicle, the length of the linear portion of the corner portion 123 in cross section is preferably greater than 3 mm, preferably less than 10 mm.
[0067]
　Further, if the angle X is not 180 °, the first virtual plane 112s and the distance D between the second plate-shaped portion 122, the start position of the second plate portion 122 side of the rounded shape of the corner portion 123 ( and R blind) 123b and a virtual plane vertical distance between the first virtual plane 112s.
[0068]
　A projection view of a structural member 100 shown projected from the side in FIG. 4, schematically shown in FIG. Here, the projection view from the side, meaning the projection of when projected from a direction indicated by an arrow in FIG. The projection direction is parallel to the top plate portion 112 and perpendicular to the longitudinal direction of the structural member 100.
[0069]
　In the example shown in FIG. 5, the projection area of ​​the reinforcing member 120 is present within the projection area of ​​the press-molded product 110. The second plate-shaped portion 122 is disposed between the flat 112s and the plane 113As. According to this structure, since the structural member 100 can be made compact, structural member 100 is less likely to interfere with other components. The structural member 100 is less likely to interfere with other components, the reinforcing member 120 which means that hardly interfere with other components. When load is applied to the structural member, the force and the reinforcing member 120 comes into contact with the other member reinforcement member 120 tilts the vertical wall portion 111 of the press-molded product 110 inside is weakened. Thus, the projected area of ​​the reinforcing member 120 is preferably present in the range of the projection area of ​​the press-molded product 110.
[0070]
　An example of when the structural member of the present embodiment is a side sill, shown schematically by the perspective view of FIG. 6A and 6B. For ease of understanding, in FIGS. 6A, 6B, and later to FIG. 7A, and displays the reinforcing member 120 in gray. Structural members (side sill) 100 shown in FIGS. 6A and 6B each include a press-molded product 110, two reinforcing members 120 and the other member 130,. In the example shown in FIG. 6A, the reinforcement member 120 is disposed over the entire longitudinal direction of the press-molded product 110. As shown in FIG. 6B, the reinforcing member 120 may be disposed only on a part of the longitudinal direction of the press-molded product 110.
[0071]
　Besides, even if the structural member of the present embodiment is a bumper beam, a reinforcing member 120 may be disposed only on a part of the length of the press-molded product 110. Bumper beam, the two ends of the longitudinal direction is attached to the crash boxes or the like. Therefore, the longitudinal center of the bumper beam is easiest to deflection. Side sill Similarly shown in Figure 6B, by providing the reinforcement member 120 only in the middle of the structural member 100 can reinforce the center of the most strength is required bumper beam. Furthermore, the two ends of the longitudinal direction of the bumper beam reinforcing is not always necessary, the partial reinforcement member 120 is not provided, it lighter. In short, the reinforcing member 120 strength by providing to limit where needed, it is possible to both improve and weight of the strength of the structural member 100.
[0072]
　When providing longitudinal reinforcement to a part member 120 of the press-molded product 110, when the entire length of the press-molded product 110 is L, the reinforcing member 120 on both sides from the longitudinal center of the press-molded product 110 L / region of up to 6 preferably (as a whole region of the L / 3) is provided.
[0073]
　An example of when the structural member of the present embodiment is a center pillar, showing schematically the perspective view of FIG. 7A. Structural member (center pillar) 100 shown in FIG. 7A, respectively, include a press-molded product 110 and the two reinforcing members 120,. In the example shown in FIG. 7A, the reinforcing member 120 is disposed only on a part of the longitudinal direction of the press-molded product 110.
[0074]
　Examples of the cross-sectional shape of the reinforcing member 120 of the present embodiment is shown in FIG. 7B ~ Figure 7D. As shown in FIG. 7B, the cross-sectional shape of the reinforcing member 120 may have a shape in which a U-shape by connecting the linear three sides. As shown in FIG. 7C, the sectional shape of the reinforcing member 120 may be a triangular shape. As shown in FIG. 7D, the cross-sectional shape of the reinforcing member 120 may be a rectangular shape. That is, the reinforcing member 120 may include other plate-like portion other than the first plate-shaped portion 121 and the second plate-shaped portion 122 may not include the other plate-like portion. In any case of FIG. 7B ~ Figure 7D, as described above, when the load is applied to the top plate 112 of the press-molded product 110, the vertical wall portion 111 of the press-molded product 110 by the reinforcing member 120 can defeat inside, the effect of structural members of the present embodiment can be obtained.
Example
[0075]
　It will be described in more detail by way of examples the invention.
[0076]
　(Example 1)
　In Example 1, a structural member of the present embodiment (Embodiment), for a structural member of the comparative example, were simulated three-point bending test. In the simulation, using a general-purpose FEM (Finite Element Method) software (LIVERMORE SOFTWARE TECHNOLOGY Co., Ltd., trade name LS-DYNA). The cross-sectional view of a sample 3 (present invention examples) used in the simulation is shown schematically in Figure 8A. Structural member 100 of Figure 8A, consists of other member (back plate) 130. welded to the flange portion 114 of the press-molded product 110, two reinforcing members 120 and the structural member 100. Size of Sample 3 shown in FIG. 8A is as follows. However, the thickness of the steel sheet is not considered in the following sizes. In Sample 3, a top plate portion 112 and the second plate-shaped portion 122 are coplanar. In sample 3, the first plate-shaped portion 121, spot welding (pitch: 40 mm) was assumed to be fixed to the vertical wall 111 by.
And angle X (the angle between the top plate and the second plate-shaped portion): 180 °
(angle between the top plate portion and the vertical wall portion) and angle Y: 90 °
and and angle Z (first plate-shaped portion angle between the second plate-shaped portion): 90 °
of the steel plate constituting the-structural member tensile strength: 1180 MPa
of the steel sheet composing the-structural member thickness: 1.4 mm
, L-shaped portion of the height (width W1) : 20 mm
· L-shaped portion of the width (W2): 20 mm
height of-vertical wall portion HP: 60 mm
- 2 one distance between the vertical wall portion (the width of the top plate WP): 80 mm
width of and back plate WB: 120mm
- corners 113 and 123, and the song of Rc radius: 5 mm
, longitudinal length: 1000 mm
[0077]
　Width W1 is the length of the reinforcing member 120 in a direction parallel to the first plate portion 121 perpendicular to the longitudinal direction of the structural member 100. Width W2 is the length of the reinforcing member 120 in a direction parallel to the top plate portion 112 perpendicular to the longitudinal direction of the structural member 100. Width W2, the reinforcing member 120 corresponds to the length that protrudes from the vertical wall portion 111 in the horizontal direction.
[0078]
　The cross section of Sample 1 (Comparative Example) used in the simulation shown schematically in Figure 8B, a sectional view of Sample 2 (comparative example) shown in FIG. 8C, Sample 4 a cross-sectional view of (Comparative Example) Figure 8D show. Sample 1 is a sample having a structure resulting from the removal of the reinforcement member 120 from the structural member 100 of the sample 3. Sample 2, the L-shaped reinforcing member 120, a sample spot welded to the inner corner portion 113 of the press-molded product 110. Sample 4, the structural member 100 of the sample 3 Remove the reinforcing member 120, by depressing a portion of each top plate 112 and two vertical wall portions 111 inwardly, connection region between the top plate portion 112 and the vertical wall portion 111 it is a sample of the extending portion 124 is provided on. In projecting portion 124 of the sample 4, the steel sheet is not superimposed.
[0079]
　In sample 2, for along the reinforcing member 120 to the press-molded product 110, the radius of curvature at the corner 123 of the reinforcing member 120 was set to 3.6 mm. Also, the widths W1 and W2 of the reinforcing member 120 of the sample 2 was 18.6mm, respectively. Samples 2 and 3 of the press-molded product 110 and member 130 are the same as those of the sample 1.
[0080]
　In Sample 4, dented W3 to the respective inner top plate 112 and two vertical wall portions 111 was set to 14 mm. Recess width W4 of the top plate 112, and 50 mm, the shape of the top plate portion is provided so as to be symmetrical. Width W5 of the recess of one of the vertical wall portion 111, and 30 mm, the shape of the vertical wall portion is provided so as to be vertically symmetrical. The other vertical wall portion is the same.
[0081]
　The three-point bending test method used in the simulation is shown schematically in FIG. Three-point bending test, placing the sample into two pivot 1, it was carried out by pressing the samples from upward by impactor 2. In Test Example 1, the distance S between the two pivot 1 was 400mm or 700 mm. The radius of curvature of the pivot 1 was 30 mm. The radius of curvature of the impactor 2 was 150mm. Collision speed of the impactor 2 was 7.5km / h. Impactor second width (paper to the length of the vertical direction in FIG. 9) was greater than the sum of the width of the top plate 112 and the reinforcement part 120 of the sample 3 (120 mm).
[0082]
　In the simulation of the three-point bending test it was assumed impinging impactor 2 from the top plate portion 112 side of each sample. The simulation result when the distance S between the fulcrum of 700 mm, shown in FIGS. 10 to 13. Incidentally, simulation results of Sample 4 shown only in FIG. 12. The horizontal axis of FIG. 10 shows the amount of displacement. Here, the amount of displacement, impactor 2 is a moving distance of the impactor 2 from contact with the sample. The vertical axis of FIG. 10 shows a load generated in the impactor 2.
[0083]
　The amount of displacement shown in FIG. 11 the energy absorption amount of each sample at the time of 30 mm. Further shows the energy absorption amount of each sample displacement amount at the time of 30 mm, the results of evaluation in consideration of the mass of each sample in Figure 12. The vertical axis of FIG. 12 shows the value of the energy absorption amount of the vertical axis divided by the mass of the sample of Figure 11. Further, in FIG. 13 shows the maximum value of the load displacement is applied up to the point of 20 mm.
[0084]
　As shown in FIGS. 10 and 11, the sample 3 of the example of the present invention, in the initial stage of the collision area (less area displacement is about 30 mm), as compared to Samples 1 and 2 of the comparative example, load and energy absorption it was great. It loads and energy absorption amount is large, it means that resistance to collision is high. The results of FIG. 12 is also a structural member of the same mass, the characteristics of the sample 3 of the present invention example shows that higher than the samples 1, 2 and 4 of the comparative example. Therefore, according to the present invention, it is possible to reduce the weight of the structural member while maintaining the collision safety performance.
[0085]
　In case the distance S between the fulcrum of 700 mm, the simulation results for each sample of the cross-section shape when the displacement amount is 20 mm, shown in FIGS. 14A ~ FIG 14C. Sample 2 shown in the sample 1 and 14B shown in FIG. 14A, the vertical wall portion lying outside. On the other hand, in the sample 3 shown in FIG. 14C, the vertical wall portion lying inwardly. Characteristic is higher reasons sample 3 is not clear at present, but may have to support the load by the vertical wall portion collapses inward.
[0086]
　The above results qualitatively, whereas the second moment during the deformation in the sample 1 and 2 is greatly reduced, presumably because reduction of the sample 3 second moment is small. Anyway, who vertical wall portion fell inside the fall on the outside, excellent crashworthiness characteristics. Here, shows an embodiment in which the joining cross-sectional shape of the reinforcing member to the ridge portion in the L-shape (the boundary between the vertical wall portion and the top plate) in order to defeat the vertical wall portion on the inside. By joining the L-shaped cross section of the reinforcing member in this manner, the reinforcing member rotates deformed to push the vertical wall portion inwardly when a load is applied. That has been joined to L-shaped cross section of the reinforcing member to the ridge in this embodiment, the shape of the reinforcing member may have a shape which can be modified to defeat the vertical wall portion on the inside.
[0087]
　The simulation result when the distance S between the fulcrum of 400 mm, shown in FIGS. 15 to 18. Figures 15 to 18 are views corresponding to FIGS. 10 to 13. Similar to FIG. 13, FIG. 18 shows the maximum value of the load displacement is applied up to the point of 20 mm. Distance S is as in the case of 700 mm, even when the distance S is 400 mm, the sample 3 of the example of the present invention, it exhibited higher characteristics than the sample 1 and 2 of the comparative example.
[0088]
　(Example 2)
　In Example 2, varying the width W2 of the sample 3 was simulated. Specifically, the width W2 of the sample 3, 20 mm (sample 3), 15 mm (Sample 3a), was changed to 10 mm (sample 3b), and 5 mm (sample 3c). Samples 3 and 3a ~ 3c are examples of the present invention. For samples 1 and 2 of the samples and comparative examples were evaluated in the same manner as in Example 1. Samples 1 and 2 of the comparative example is the same as Samples 1 and 2 described in Example 1.
[0089]
　The simulation result when the distance S between the fulcrum of 400 mm, shown in FIGS. 19 to 21. Figures 19 to 21 are views corresponding to FIGS. 11 to 13. In the case the distance S between the fulcrum of 400 mm, the simulation results of the sample 4 are not shown.
[0090]
　As shown in FIGS. 19 and 20, samples of the present invention example, to the sample of Comparative Example had higher characteristics in three-point bending test. If the distance S is 400 mm, L-shaped width is not less than 5 mm, more properties equivalent to Comparative Example was obtained. Incidentally, both samples of the present invention embodiment, the vertical wall portion falls down on the inside by the collision of the impactor.
[0091]
　The simulation result when the distance S between the fulcrum of 700 mm, shown in FIGS. 22 to 24. Figures 22 to 24 are diagrams corresponding to FIGS. 11 to 13.
[0092]
　As shown in FIG. 23, samples of the present invention example L-shaped width is 10mm or more, compared to the comparative sample, characteristics per unit mass was high. As shown in FIG. 24, samples of the present invention example L-shaped width is 10mm or more, compared to the comparative sample, the amount of displacement was greater maximum value of the load applied by the time of 20 mm. Further, the sample of the present invention example L-shaped width is 15mm or more, characteristics were higher than the comparative examples in any of the tests.
[0093]
　These results, L-shaped width, preferably at 5mm or more, more preferably 10mm or more, indicating that further preferably 15mm or more.
Industrial Applicability
[0094]
　The present invention is applicable to structural members for automobiles.
DESCRIPTION OF SYMBOLS
[0095]
　100: Structure member
　110: press-formed product
　111: longitudinal wall portion
　112: the top plate portion
　113: corner
　114: flange portion
　120: reinforcement member
　121: first plate-like portion
　122: second plate-shaped portion
　130: Other member of

The scope of the claims

[Requested item 1]A structural member for a motor vehicle,
　and a press-molded article formed from a sheet of steel plate, the and a reinforcement member fixed to the press molded product,
　wherein the press-molded article, the two vertical wall portions 2 one of and a top plate connecting the vertical wall portion,
　the reinforcing member includes a first plate-shaped portion and a second plate-shaped portion is a member of the cross section L-shaped,
　the top plate along said second plate-shaped portion is the first plate-like portion so as to protrude from the vertical wall portion toward the outside direction is fixed to the vertical wall, structural members for automobiles.
[Requested item 2]
　The reinforcing member is fixed only to the press-formed article of claim 1, structural members for automobiles.
[Requested item 3]
　Section of the boundary between said vertical wall portion and the top plate is a rounded rounded shape,
　the top plate portion side from the start position of the rounding shape of the vertical wall portion, the second plate parts are arranged, according to claim 1 or according to 2, structural members for automobiles.
[Requested item 4]
　When projecting the structural member from the side, the projection area of ​​the reinforcing member is present within the projection area of ​​the press-formed article, according to any one of claims 1 to 3, for a motor vehicle structural members.
[Requested item 5]
　The reinforcing member is made of steel sheet, according to any one of claims 1 to 4, structural members for automobiles.
[Requested item 6]
　Wherein the reinforcing member comprises two,
　said reinforcing member in each of the two vertical wall portions is fixed, according to any one of claims 1 to 5, structural members for automobiles.
[Requested item 7]
　The press molded product includes two flange portions extending from the ends of the two vertical wall portions,
　the structural member further includes other members made of steel plate,
　and the said other member and the press-molded product so as to form a closed cross section, said other member is fixed to the two flanges, according to any one of claims 1 to 6, structural members for automobiles.
[Requested item 8]
　Wherein the reinforcing member and the press molded product is, the following formulas,
　the plate of [the thickness of the reinforcing member (mm)] × [the tensile strength of the reinforcing member (MPa)] × 0.8 ≧ [the press molded product thickness (mm)] × [the press molded product of the tensile strength (MPa)]
meet, according to any one of claims 1 to 7, structural members for automobiles.
[Requested item 9]
　Distance between said top plate and the second plate-shaped portion is 0 mm ~ 20 mm, according to any one of claims 1 to 9, structural member for an automobile.
[Requested item 10]
　Corner radius of curvature between the first plate-shaped portion and the second plate-shaped portion of the reinforcing member is 5% to 50% of the overall length at the cross section of the reinforcing member, according to claim 1 according to any one of 9, structural member for an automobile.
[Requested item 11]
　When the entire longitudinal length of the press molded product is L, the reinforcing member is provided in a region of up to L / 6 to both sides from the longitudinal center of the press-any one of claims 1 to 10 description, structural members for automobiles.
[Requested item 12]
　It said first plate portion and the angle between the formed second plate-shaped portion is 70 ° ~ 120 °, according to any one of claims 1 to 11, structural members for automobiles.