JP2010195117A - Skeletal component for vehicle - Google Patents

Abstract

An object of the present invention is to provide a technique for improving the bending / torsional rigidity of a closed cross-section structural component without inserting a reinforcing component such as a bulkhead inside.
In order to solve the above problems, the present invention provides a metal plate with one or two or more protrusions, and the metal plate is substantially circular or polygonal in cross section with the protrusions on the inner surface side. A closed cross-section structure member formed by joining the flange portions provided on the plate end surfaces or the plate end surfaces of the metal plate, and the protrusion portions and / or the protrusion portions and the wall portions are in contact with each other inside the member It is what. In addition, the contact part between the protrusion and the protrusion and / or the contact part between the protrusion and the wall is joined, and as the means, welding, caulking, rivet or bolting is used. is there.
[Selection] Figure 5

Description

  The present invention relates to a skeleton component for a vehicle, and more particularly to a skeleton component for a vehicle used for a vehicle body frame having a closed cross-sectional structure.

  For vehicle frame parts with a closed cross-section structure, a closed cross-section structure in which a metal plate is press-molded into a substantially hat shape, the hat-shaped members are butted in opposite directions and the flange portion is joined by spot welding, etc. Closed cross-section parts formed into a target shape by rotating pulling bending or hydroforming using a pipe, or metal plates are formed into a cylindrical shape with a substantially circular or polygonal cross section by roll forming, etc., and the ends of the plates are welded together A part having a closed cross-section structure is used by joining together.

  However, the closed cross-section structure has a problem that when the structural member is elongated in the longitudinal direction, the inside of the closed cross-section is hollow, so that even if a high-strength material is used, the bending rigidity and torsional rigidity of the parts are significantly reduced. There is. As a countermeasure, it is common to install a part called a bulkhead in the closed section structure as a reinforcing part to compensate for the decrease in rigidity (Fig. 1), and the bulkhead is substantially perpendicular to the longitudinal direction of the member having the closed section structure. It is inserted into the closed cross section so as to constitute a partition wall.

  This part is a closed cross-section structural member that welds hat members, and when the hat members are welded, they need only be installed inside and welded, and are widely used as a relatively simple rigidity improving method.

  Closed cross-section parts formed by rotating bending or hydroforming using a metal tube, or metal plates are formed into a cylindrical shape with a substantially circular or polygonal cross section by roll forming, and the ends of the plates are joined by welding or the like In the past, there has been no technique for inserting a bulkhead into a part having a closed cross-sectional structure after processing.

  Patent Document 1 discloses a method for improving the rigidity of a component by inserting a component having a protrusion shape in a closed cross section. This method is performed after a protrusion-shaped reinforcing component is inserted into a lid. Thus, the closed cross-section member is manufactured by joining, and cannot be applied to a member having a closed cross-section previously configured as described above.

Japanese Patent No. 2660992

  In a structural part formed by hydroforming using a metal tube as a raw material or a structural part formed by forming a metal plate into a cylindrical shape by roll forming or the like, there is a problem that the bulkhead cannot be inserted and joined after forming. For this reason, a bulkhead cannot be adopted as a method for improving rigidity, and development of a method for improving the bending / torsional rigidity of long parts is desired.

  The present invention is a vehicle frame component suitable for a frame component used for a vehicle frame or the like, and a metal plate is formed into a substantially circular or polygonal cross-section cylinder by press working or roll forming, and the plate end The purpose is to provide a technology that improves the bending and torsional rigidity of closed cross-section structural parts without inserting reinforcing parts such as bulkheads into closed cross-section structural parts that join parts by welding or caulking. And

  In order to solve the above problems, the present invention provides a metal plate having a substantially circular or polygonal cross-section with one or more protrusions provided on the metal plate and with the protrusions on the inner surface side. A closed cross-section structural member formed by joining the flange portions provided on the plate end surfaces or the plate end surfaces of the metal plate, and having a structure in which the protrusions and / or the protrusions and the wall are in contact with each other. is there. Also, the contact portion between the protrusion and the protrusion and / or the contact portion between the protrusion and the wall is joined, and as the means, welding, caulking, rivet or bolting is used. is there.

  According to the present invention, it is difficult to insert reinforcing parts such as a conventional bulkhead, and it is difficult to improve the bending / torsional rigidity of the member, and the plate ends are joined to each other in a cylindrical shape. It is possible to efficiently improve the bending / torsional rigidity without increasing the thickness of the member by increasing the thickness of the member with respect to the closed cross-section structural component for the vehicle skeleton.

  Further, according to the present invention, the rigidity can be improved without attaching a reinforcing component, so that the vehicle body can be reduced in weight, and when applied to an automobile skeleton component, a fuel efficiency improvement effect can be expected.

It is a figure explaining the method of applying a bulkhead to a closed section structural member. It is a figure which shows the closed cross-section structural member produced by roll molding or press molding. It is a figure which shows the metal plate which provided the projection part. It is a figure which shows a bending process position. It is a figure which shows the closed cross-section structural member which has a hexagonal cross section. It is a figure explaining the torsional rigidity evaluation method. It is a figure explaining a bending rigidity evaluation method. It is a figure explaining the cross-sectional dimension of the member created in the Example. It is a figure explaining the rigidity improvement effect by this invention.

  In general, in the case of a skeletal component that has a closed cross-section structure by welding the flanges by butting the hat bending members together, the bulkhead 1 is inserted into the hat member 2 side of one side as shown in FIG. It is possible to assemble by welding the flange part of the hat members 2 and 3 after welding the part and the wall part of the hat member 2, and closing the lid part with the other hat member 3.

  On the other hand, as shown in FIG. 2, in the case of a closed cross-section structural member 4 that is processed into a cylindrical shape from a metal plate by roll forming or press forming and the plate ends are joined 10 by welding or the like, The head cannot be inserted. In such a case, as shown in FIG. 3, the method of the present invention in which the protrusions 6 are provided on the metal plate 5 in advance by press molding or the like is effective. As shown in FIG. 4, the metal plate to which the protrusions 6 are provided is processed so that the dotted line is folded, and is processed so that the protrusions 6 are installed inside the cylindrical closed cross-sectional structure.

  In this example, the position and the height of the protrusion 6 are determined in advance so that the two protrusions 6 come into contact with each other after the closed cross-section processing, and after the processing, the protrusion 6 is shown in FIG. They will be in contact with each other. In the case of a structure having no bulkhead in the closed cross section shown in FIG. 2, the cross-sectional shape tends to be flat when subjected to bending deformation or torsional deformation, and its rigidity is small.

  On the other hand, in the case of the closed cross-section structural member 7 shown in FIG. 5 according to the present invention, the protrusions are in contact with each other, thereby suppressing the flatness of the cross-sectional shape due to bending deformation and the inclination of the cross-sectional shape due to shear deformation. As a result, the bending rigidity and torsional rigidity of the parts are greatly improved.

  Furthermore, by joining the protrusions, the position of the attached protrusions will not shift (the relative position will be fixed), and the cross-sectional shape of the closed cross-section member will be difficult to deform, The rigidity improvement effect is further increased.

  Here, the invention has been described by taking a closed cross-section structural member having a hexagonal cross-section as an example, but the effect of the present invention is not limited to the cross-sectional shape, and the cross-sectional shape may be substantially circular or other polygonal shapes. Good. Further, the processing method of the protrusion shape may be general press working using a mold, or may be hydraulic forming or sequential forming, and the effect of the invention does not depend on the forming method. The number of protrusions may not be two, and in the case of one, the dimensions of the protrusions may be determined so that the protrusions are in contact with the side wall of the closed cross-section structural member. Moreover, even if there are three or more protrusions, if the protrusions are installed so as to be in contact with each other, the same effect of improving the rigidity can be obtained.

  A closed cross-sectional structure in which hat members are overlapped as shown in FIG. 8 and a hexagonal cross-sectional closed cross-sectional structure were manufactured by bending by press molding. In order to compare the effects, the cross-sectional lengths were adjusted to substantially the same length. The length in the longitudinal direction of the closed cross-section structural component was 800 mm. A cold-rolled steel sheet having a thickness of 1.4 mm and a tensile strength of 590 MPa was used as the material. The flange part of the hat member was joined by spot welding, and the structural members having a hexagonal cross section were joined to each other by laser welding.

  With respect to the torsional rigidity of the part, as shown in FIG. 6, one end of the member was completely fixed, a torsional moment was applied to the opposite end, the torsion angle of the part was measured, and the torsional rigidity was measured. As for the bending rigidity of the parts, as shown in FIG. 7, one end of the member is completely fixed, a load is applied to the opposite end (cantilever type), and the displacement at the load position is measured. The bending stiffness was measured.

FIG. 9 shows the measurement results of bending rigidity and torsional rigidity. Comparative example 1: Close cross-section structural member in which hat members are overlapped and bonded ○ Comparative example 2: Bulk head is installed inside closed cross-section structural member in which hat members are overlapped and bonded ○ Comparative example 3: Hexagonal cross section Closed cross-section structural member Example of the present invention 1: A hexagonal closed cross-section structural member provided with two protrusions according to the present invention (FIG. 6)
Example of the present invention 2: A projecting shape according to the present invention is given to a closed cross-section structural member having a hexagonal cross section, and the projecting portions are joined by spot welding. The effect was compared with the rigidity value of Comparative Example 1 as 100%.

  Bending rigidity and torsional rigidity are improved by inserting a bulkhead into a closed cross-section structure member in which ordinary hat members are joined as in Comparative Example 2, but the closed cross-section structure member has a hexagonal cross-section shape in the same manner. It can be seen that the bending rigidity and the torsional rigidity are improved by applying the present invention example 1. Furthermore, as shown as Invention Example 2, it was confirmed that a further rigidity improvement effect can be obtained by joining the protrusions of the member to which Invention Example 1 is applied by spot welding.

1: Bulk head 2: Hat member (bulk head insertion side)
3: Hat member (lid side)
4: Closed cross-section structural member 5 having a hexagonal cross-sectional shape 5: Metal plate 6 provided with a protrusion 6: Protrusion 7: Closed cross-section structure member 10 having a hexagonal cross-section to which the present invention is applied: Welding position

Claims (3)

  After providing one or more protrusions on the metal plate, the metal plate is formed into a substantially circular or polygonal cross-section with the protrusion on the inner surface side, and is formed on the plate end surface or the plate end surface of the metal plate. A vehicle frame component characterized in that a closed cross-section structural member is formed by joining provided flange portions, and the protrusions and / or the protrusion and the wall are in contact with each other inside the member.   2. The vehicle skeleton component according to claim 1, wherein a contact portion between the protrusions and / or a contact portion between the protrusion and the wall is joined.   3. The vehicle frame part according to claim 2, wherein the contact parts are joined using at least one of a welding method, a caulking method, a rivet method, and a bolting method.

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