JP4709174B2 - Aluminum alloy automobile body structure member and automobile body dissimilar material structure member - Google Patents

Description

  The present invention relates to a structural member made of an aluminum alloy for a structural member of a different material and a structural member of a different material in which an aluminum alloy material and a steel material are combined. The aluminum alloy structural member and the dissimilar material structural member for the dissimilar material structural member of the present invention do not have a dissimilar material joint part between the aluminum alloy material and the steel material to be combined or have few dissimilar material joint parts. For this reason, it is suitable for structural members that are highly likely to be combined with aluminum alloy materials and steel materials, such as transportation fields such as automobiles and railway vehicles, machine parts, and building structures.

  If the aluminum alloy material can be applied in combination with a structural member (steel structural member) using a steel material such as an automobile, the structural member can be reduced in weight, which can significantly contribute to the weight reduction of the entire vehicle body. Here, the aluminum alloy material is a generic term for pure aluminum and an aluminum alloy, and includes a rolled plate, an extruded profile, a forged material, a cast material, and the like. Moreover, a steel material is a general term for a steel plate, a steel mold material, a strip steel, and the like.

  In addition, the steel panel structure installed on the side of the vehicle body has a side impact that has become more stringent in recent years in order to protect passengers in the passenger compartment as well as the basic characteristics of rigidity and strength. In addition, deformation resistance and buckling resistance against offset frontal collisions are required. These steel panel structures include a side sill (rocker), a pillar, a door, and the like, and are composed of a panel structure of an outer panel and an inner panel.

  In order to ensure the impact resistance of securing strength to prevent crushing, buckling or deformation against these new collision standards, aluminum alloy materials are used for steel structural members such as panel structures. It is advantageous to use as a reinforcing member. For example, if an aluminum alloy material is interposed as a reinforcing member between the outer panel and the inner panel constituting the steel structural member, the deformation resistance and buckling resistance against the side collision can be advantageously improved. it can.

  Since the aluminum alloy reinforcing member is lightweight, the reinforcing effect of increasing the thickness by increasing the thickness can be exhibited. In this respect, the reinforcing member made of aluminum alloy is extremely advantageous than the reinforcing member made of high strength (high strength thin steel plate) having high strength. If you try to show the reinforcing effect of thickening in high tension in the same way, there is a limit to the thickening of high tension itself, so it is necessary to superimpose high tension (multiple sheets) and the number of parts increases. , A great weight increase. In other words, the aluminum alloy reinforcing member can minimize the increase in weight due to the addition of these reinforcing members, as compared with the steel reinforcing member that can exhibit the same effect. Further, the number of parts does not increase, and conversely, the number of assembly members can be reduced.

For this reason, conventionally, the following example is known and adopted as a dissimilar material structural member combining an aluminum alloy material and a steel material in an automobile body.
(1) Door beam (aluminum alloy hollow shape reinforcing material) and steel door panel.
(2) Reinforcing aluminum alloy hollow shapes into steel panel structures such as steel center pillars and side sills.
(3) Bumpers and crushable boxes made of steel bumpers and side members and aluminum alloy hollow shapes.

  However, it is often necessary to weld and join a steel material and an aluminum material in a dissimilar material structural member that combines an aluminum alloy material and a steel material in these automobile bodies. However, when steel and aluminum are welded together, it is very difficult to obtain a reliable and high-strength joint (joint strength) because brittle intermetallic compounds are likely to form in the joint. Met.

  On the other hand, for joining these dissimilar material joined bodies, conventionally, joining using bolts, rivets or the like, or an adhesive is used. However, an aluminum alloy material often serves as a substitute for one steel material side between steel materials conventionally welded together. For this reason, in the manufacturing process of an automobile body, which is promising as a production process by welding, when steel and aluminum are used instead of the conventionally used welding, the above different joining methods are used. The efficiency of the assembly process is significantly reduced.

  This is a major cause that hinders the significant expansion of application of aluminum alloy materials for reducing the weight of automobile bodies. On the other hand, if these aluminum alloy materials and steel materials can be spot-welded, for example, in the assembly process of automobile bodies, the spot welding process of automobile bodies using only steel materials can be used as it is. is there. In particular, if a dissimilar material joined body having a large dissimilar material joining area (long dissimilar material joining length), for example, a dissimilar material joined body (a dissimilar material joining panel) of a panel formed from an aluminum alloy plate and a panel formed from a steel plate can be spot-welded. This advantage is great.

  Therefore, many studies have been made on spot welding methods for these dissimilar material joints. For example, as a spot welding method that can join different materials reliably and with high strength without using expensive cladding materials or insert materials, an aluminum plate is sandwiched between steel plates, and three layers, four layers, six layers, etc. It is disclosed that they are stacked in multiple layers (see Patent Documents 1, 2, and 3).

In this technique, these multi-layered overlapping portions are sandwiched between a pair of electrodes, a large current is passed between the electrodes for a short time, and the molten portion of the aluminum plate is excluded from the spot welding region. As a result, the welded portion directly joins the steel plates without using an aluminum plate, and suppresses the formation of an intermetallic compound at the joint interface. And as an example of this embodiment, the edge of the steel plate is bent back by hemming, and at the same time, an aluminum plate is sandwiched between the bent piece and the steel plate, and the three-layer overlapped portion is spot welded. It is disclosed.
JP-A-7-328774 JP-A-9-155561 JP 2003-236673 A

  Certainly, even in these conventional techniques, the effect of improving the joint strength of the joint by spot welding is recognized. However, considering the application of a dissimilar material joint (or dissimilar material welded joint) in which these steel and aluminum are welded together to a structural member such as an automobile, it can withstand a large load (stress) that is applied when the automobile collides. Joint strength is required. A sufficient joint strength or joint strength for this has not been obtained by these conventional techniques. As a result, spot welding between a steel material and an aluminum material has not yet been put to practical use for structural members such as automobiles.

  The tendency that this sufficient joint strength or bonding strength cannot be obtained is remarkable in the case of a galvanized steel sheet (galvanized steel material) in which the surface of the steel sheet is subjected to electrogalvanization or hot dip galvannealing. And this kind of galvanized steel sheet is widely used for automobile bodies as is well known. Therefore, also in this respect, the spot welding of the steel material and the aluminum material described above has been a major factor that has not been put into practical use for structural members such as automobiles.

  For this reason, in the present invention, when a structural member made of an aluminum alloy is made of a different material structural member joined to another steel structural member, the aluminum alloy material and the steel material to be combined do not have a dissimilar material joining portion or a different material joining. An object of the present invention is to provide an aluminum alloy structural member and a dissimilar material structural member with few parts.

To achieve the above object, the gist of the present invention an aluminum alloy structural member is a aluminum alloy structural member is interposed as a reinforcing member between the outer panel and the inner panel of the steel Sei構 Concrete member, the structural member A steel plate collar is preliminarily welded and joined to the outer edge of the aluminum alloy material formed in the required shape as a member, and the aluminum alloy structural member is assembled to the steel structural member. Then, both the outer panel and the inner panel of the steel structural member, and only the collar portion made of the steel plate are joined via the steel plate collar, the aluminum alloy structural member, the outer panel, and the inner panel, Is to be a dissimilar material structure member that does not have a dissimilar material joint part directly joined .

Specific embodiments of the previous SL aluminum alloy material, the panel, the extruded profile is preferred. The extruded profile is preferably a hollow profile as a reinforcing material. The thickness of the aluminum alloy material is preferably 3 mm or more as a reinforcing material.

In order to achieve the above object, the gist of the dissimilar material structural member of the present invention is a dissimilar material structural member in which the aluminum alloy structural member of any one of the above aspects is joined to a steel structural member, and this aluminum alloy The structural member is interposed as a reinforcing member between the outer panel and the inner panel constituting the steel structural member, and the aluminum alloy structural member is an aluminum alloy material formed into a necessary shape as the structural member. A steel plate collar is preliminarily welded and joined to the outer edge portion of the steel plate, and the aluminum alloy structural member is assembled to the steel structural member. and both outer panel and an inner panel of steel structural members, only are joined by the collar portion of the steel, the aluminum alloy structure And said outer panel and the inner panel is to have no bonded dissimilar materials bonded portion directly.

  The dissimilar material structural member is preferably selected from pillars, side sills, and roof side rails.

  Further, the aluminum alloy structural member is pre-manufactured in a process different from the automobile body assembly process, and the aluminum alloy structural member is arranged in the automobile body assembly process via the steel plate collar. It is preferable that the steel structural member be joined to either or both of the outer panel and the inner panel.

  In the present invention, a steel plate collar (meaning a collar and a protruding piece) is provided on the outer edge of the structural member made of aluminum alloy in a process separate from the normal automobile body assembly process (outside the normal automobile body assembly process). In this case, the aluminum alloy structural member of the present invention is assembled and manufactured in advance integrally. Then, the aluminum alloy structural member of the present invention is joined to either or both of the outer panel and the inner panel of the steel structural member via the steel plate collar in a normal automobile body assembly process. .

  As a result, the degree of freedom of joining means for joining different materials between the steel plate collar and the aluminum alloy structural member is guaranteed without being subject to various restrictions such as joining means, joining conditions and process conditions in the automobile body assembly process. Is done. For this reason, it is possible to select and combine various joining means to be described later for joining the dissimilar material joining portions, and thereby it is possible to guarantee the joining strength even in the dissimilar material joining. In addition, the steel plate collar and the aluminum alloy structural member integrated in advance can be assembled as one unit or module into the steel structural member in a normal automobile body assembly process.

  And on this assembly | attachment, it can join with the outer panel of the said steel structural member, the inner panel, or both through the said collars 14 and 14 made from a steel plate. In this case, the collar made of the steel plate does not have a dissimilar material joint portion in which the aluminum alloy structural member and the steel structural member of the aluminum alloy and the steel in each structural member are directly joined, or this The number of different material joints can be reduced. And the junction part of a dissimilar-material structural member can make mainly the junction part of steel materials only, or the junction part of steel materials substantially.

  Therefore, it is possible to use joining means such as spot welding used for ordinary steel materials and joining conditions, and it is possible to use a joining method and apparatus similar to those for ordinary steel materials. Even when using, the production process (line) of the automobile body can be made efficient. Usually, when using an aluminum alloy structural member, due to problems such as mutual bondability, a large line change in the production process of a steel automobile body is likely to be necessary. This is not necessary. In other words, even as a dissimilar material structural member with an aluminum alloy structural member, the same level of efficiency as that of a structural member between ordinary steel materials can be ensured without reducing process changes and production efficiency.

  In addition, since the aluminum alloy structural member of the present invention can be manufactured in a (external) dedicated process different from the normal automobile body assembly process, the bonding strength of the dissimilar material structural member is conversely not affected by the production efficiency. It is easy to adjust, manage, or change processes. This makes it possible to perform a special joining method, joining conditions, or heat treatment to bring the joining strength and strength of steel structural members close to the same level.

  As a result, it is possible to assemble a structural member made of aluminum alloy having a large thickness of 3 mm or more as a reinforcing member for a steel structural member. Corresponding structural strength can be ensured.

  Hereinafter, embodiments of the present invention will be specifically described. 1 and 2 show a perspective view and a cross-sectional view in the lateral direction, respectively, of an aluminum alloy structural member of the present invention and a dissimilar material structural member in which the aluminum alloy structural member of the present invention is joined to a steel structural member. FIG. 3 is a perspective view showing another embodiment of the structural member made of the aluminum alloy of the present invention shown in FIG. 4 and 5 show another embodiment of the structural member made of the aluminum alloy of the present invention and the dissimilar material structural member in which the structural member made of the aluminum alloy of the present invention is joined to the steel structural member. It shows with.

(Aluminum alloy structural member)
The structural member made of an aluminum alloy according to the present invention shown in FIGS. 1 and 2 is an embodiment specifically intended to reinforce a center pillar (B pillar) as a steel panel structure installed on the side of a vehicle body.

  1 and 2, an aluminum alloy structural member 10 is interposed as a reinforcing member between an outer panel 1 and an inner panel 5 constituting a center pillar (steel structural member). On the premise of this, the aluminum alloy structural member 10 has a substantially HAT (hat) shape in cross section, which is a necessary shape as a structural member corresponding to the structure and shape of the center pillar.

  The HAT type cross section of the structural member 10 made of aluminum alloy has a flat top portion 11, vertical walls 12, 12 on both sides projecting from the side edge of the top portion 11 in the vertical direction (backward direction in the drawing), 12 and flanges 13 and 13 on both sides projecting in the lateral direction (left-right direction in the figure).

  This HAT cross-sectional shape corresponds to the structure and shape of the center pillar to be incorporated, and is not the same in the longitudinal direction, but the HAT type expands in the lateral direction (left-right direction in the figure) as it goes down. It is molded into a shape. Such a shape can be easily obtained by press-molding an aluminum alloy rolled plate or a flat plate extruded material.

(Color made of steel plate)
In contrast to the vertical walls 12 and 12 and the flanges 13 and 13 that form the outer edge of the aluminum alloy structural member 10, steel plate collars 14 and 14 (collars and overhanging pieces) are connected to the flanges 13 and 13. Are integrally attached in such a manner as to project to the side of each (left and right in the figure). One end of each of the steel plate collars 14 and 14 has a cross section or a planar shape corresponding to the vertical wall 12 or the flange 13 of the HAT cross section so that it can be easily attached to the structural member 10 made of aluminum alloy. Further, the other end protrudes in the lateral direction (left and right direction in the figure) from the flange 13 having the HAT cross section so that the outer panel 1 and the inner panel 5 constituting the center pillar can be easily joined. It has a cross-sectional or planar shape corresponding to the inner panel 5.

  In the embodiment of FIGS. 1 and 2, the steel plate collars 14 and 14 correspond to the outer edge shape formed by the vertical walls 12 and 12 and the flanges 13 and 13 forming the outer edge portion on the aluminum alloy structural member 10 side. The whole has a substantially L-shaped cross-sectional shape. Further, the outer panel 1 and the inner panel 5 constituting the center pillar are projected to the side, and the side to be joined to these panels has a flat flange shape.

  The steel plate collars 14 and 14 are provided so as to be easily joined to the outer panel 1 and the inner panel 5 that constitute the center pillar, in addition to the above-described shape. That is, in the embodiment of FIG. 1, the steel plate collars 14 and 14 are substantially equal to the length in the longitudinal direction of the aluminum alloy structural member 10 and are provided over the longitudinal direction of the aluminum alloy structural member 10. . On the other hand, for example, as shown in the embodiment of the steel plate collars 17 and 17 in FIG. 3, the steel plate collar is partially and fragmented over the longitudinal direction of the aluminum alloy structural member 10. A plurality of sheets may be provided at intervals.

(Dissimilar material joining of steel plate collar)
The steel plate collars 14 and 14 are integrally joined to the aluminum alloy structural member 10 in advance before the aluminum alloy structural member 10 is assembled to the steel structural member. The joining between the steel plate collars 14 and 14 and the aluminum alloy structural member 10 is a dissimilar material joining, and is completed in advance in a process separate from the automobile body assembly process before assembling to the steel structural member. This is the main point of the present invention.

  Accordingly, the dissimilar material joining between the steel plate collars 14 and 14 and the aluminum alloy structural member 10 can be performed separately without being subjected to various restrictions such as joining means, joining conditions, and process conditions such as an automobile body assembly process. Can be done independently. In other words, the degree of freedom and the bonding strength of the joining means for dissimilar material joining between the steel plate collars 14 and the aluminum alloy structural member 10 are guaranteed.

  For this reason, in FIGS. 1 and 2, the dissimilar material joint portion between the steel plate collars 14 and 14 and the aluminum alloy structural member 10, which is exemplified by the X mark 15, is welded by spot welding, FSW, or the like, or an adhesive Various joining means such as bonding, self-piercing rivets, ordinary bolts and nuts can be selected and combined. In this respect, according to the required joint strength as a reinforcing material according to the required reinforcement characteristics such as the impact resistance (deformation resistance and buckling resistance) of the steel structural member to be reinforced, the selection of the joining means and Make a combination. As a result, it is possible to ensure the bonding strength even in the case of dissimilar material bonding. In the embodiment of FIGS. 1 and 2, the dissimilar material joint portion exemplified by the X mark 15 is arranged in two locations on the side 14 a of the steel plate collar 14 (the vertical wall 12 and the flange 13 of the structural member 10 made of aluminum alloy). 2), and in the longitudinal direction, a plurality of locations extending in the longitudinal direction of the collar 14 made of steel plate. The position and number of the dissimilar material joint portions are selected according to the necessary joint strength as the reinforcing material and the selected joining means.

  According to the above-described embodiment, the steel plate collars 14 and 14 and the aluminum alloy structural member 10 integrated in advance are formed as a single unit or module as a steel structure such as a center pillar in a normal automobile body assembly process. Can be assembled to a member. By this assembly, it is possible to join either or both of the outer panel and the inner panel of the steel structural member via the steel plate collars 14 and 14.

  For this reason, it does not have the dissimilar material joint part of a dissimilar material structure member, or this dissimilar material joint part can be decreased, and the junction part of a dissimilar material structure member is only the junction part of steel materials, or the junction part of steel materials substantially Can be the subject. Therefore, it is possible to use joining means and joining conditions such as efficient and low-cost spot welding, which are used between ordinary steel materials, and there is no need to change large joining means and joining conditions. In the same way, the production process of the automobile body becomes efficient. Moreover, since the aluminum alloy structural member can be manufactured in a different process from the production process of the automobile body as described above, the bonding strength of the dissimilar structural member can be close to the bonding strength of the structural member between steel materials.

  Here, when the dissimilar material joining between the steel plate collars 14 and 14 and the aluminum alloy structural member 10 is performed, the insulation is performed by interposing a resin (layer) between them with a thickness that does not hinder the joining by welding. preferable. Thereby, it is possible to reliably prevent the corrosion that is referred to as electric corrosion, which tends to occur at the interface between different kinds of metals. If this resin layer is not present, coating as an automobile body is performed, but there is a possibility that electrolytic corrosion due to contact between dissimilar metals of aluminum alloy and steel may occur. As this type of resin, various resins that are generally used or commercially available for metal insulation or anticorrosion can be used. The required thickness of the resin layer is in accordance with the use manual of these general-purpose or commercially available resins, but may be a very thin thickness of 1 μm to 500 μm.

(Aluminum alloy material)
The aluminum alloy structural member 10 is made of an aluminum alloy material formed into a necessary shape as a structural member for use as a reinforcing material. As described above, the aluminum alloy structural member 10 shown in FIGS. 1, 2, and 3 is formed by press-molding an aluminum alloy rolled plate or a flat plate-like extruded material that is an aluminum alloy material.

  Aluminum alloy materials can be used as a structural member for reinforcing materials, as well as for plates, panels formed from plates, extruded profiles, and extruded profiles, depending on the required shape, formability to the shape, and required wall thickness. The hollow shape material is appropriately selected. For example, if it is a rolled plate, it is suitable when the cross-sectional shape changes in the longitudinal direction, such as the shape of a structural member that is wide or easy to form, or the center pillar shown in FIGS. In addition, in the case of an extruded profile, the thickness of the aluminum alloy material is increased to 3 mm or more in order to increase the reinforcement effect due to the complicated shape and increase in thickness, or only a necessary thickness is increased. Is possible.

  In addition, the structural member 10 made from aluminum alloy of FIGS. 1-3 has shown the aspect which consists of a single plate (one sheet) aluminum alloy plate. However, depending on the required strength and thickness as a structural member for use as a reinforcing material, not only single plates but also aluminum alloy plates are doubled (2 sheets) or tripled (3 sheets) and joined together. May be used.

(Aluminum alloy)
The aluminum alloy used for the aluminum alloy material is an aluminum alloy excellent in such characteristics when required characteristics such as weight reduction and high strength, or high formability and weldability are particularly required as an automobile body. Select. For example, Al-Zn-Mg-Cu-based and Al-Zn-Mg-based (7000-based) alloys with excellent strength, Al-Mg-based (5000-based) alloys with good formability and weldability, low alloying elements and recyclability An Al—Mg—Si-based (6000-based) alloy having excellent age-hardening properties is exemplified.

(Steel)
The steel material used for the steel plate collars 14 and 14 in the present invention is not necessarily the same as the outer panel or inner panel of the steel structural member to be assembled or joined, but the same type, etc. Corresponding steel is selected. In consideration of ease of assembly and joining to the other steel structural member to be joined as a reinforcing material, the panel shape formed from a steel plate is the most versatile. good. Also, mild steel such as hot-rolled steel plate, cold-rolled steel plate (SPCC steel plate) or high-strength steel plate or strip (strip, wire, rod, pipe, etc.), steel plate with surface treatment such as galvanization, etc. Or a stainless steel plate etc. can be used suitably. In short, any steel material can be used as long as it is a steel material that can be welded and used widely such as resistance spot welding. However, when both light weight and high strength are required, it is preferable to use high strength steel.

(Different material structural member)
FIG. 2 shows a cross section of the dissimilar material structural member obtained by joining the aluminum alloy structural member 10 of the present invention to the steel structural member in FIG. In FIG. 2, reference numeral 1 denotes, for example, a center-pillar steel outer panel, and 5 denotes, for example, a center-pillar steel inner panel.

  In FIG. 2, an aluminum alloy structural member 10 is interposed as a reinforcing member in a space between an outer panel 1 and an inner panel 5 constituting a steel structural member as a center pillar. Here, not only the center pillar but also the structure and shape of the steel structural member (outer panel 1 and inner panel 5) side are determined by the design on the automobile body manufacturing side, and there are no restrictions in the present invention.

  However, as a structure common to panel structure materials such as center pillars, the outer panel 1 has a flat shape that has a HAT (cap) shape in cross section, which is a necessary shape as a structural member, and projects to the side of the vehicle body (upper side in the figure). The top 2, the vertical walls 3 and 3 on both sides projecting from the side edge of the top 2 in the vertical direction (the lower side in the figure), and the vertical walls 3 and 3 extending in the horizontal direction (the horizontal direction in the figure). It is formed by the flanges 4 and 4 on both sides.

  The inner panel 5 also has a HAT (cap) cross section as a necessary shape as a structural member, like the outer panel 1. And the flat top part 6 which protrudes to the vehicle body inside side (the lower side of the figure), the vertical walls 7 and 7 on both sides which protrude from the side edge of the top part 6 in the vertical direction (the vertical direction in the figure), and the vertical wall 7 shows an aspect formed by flanges 8 on both sides projecting laterally from the sides 7 and 7 (left and right sides in the figure).

  In FIG. 2, a joint portion indicated by a circle mark 16 is a joint portion of the same kind of steel material between the steel plate collar 14 in the aluminum alloy structural member 10 and the flanges 8 and 8 of the inner panel steel plate 5. Moreover, the joining part shown by x mark 15 is the dissimilar material joining part of two places of the collar 14 made from a steel plate demonstrated in FIG. 1, the vertical wall 12 of the structural member 10 made from an aluminum alloy, and the flange 13. FIG.

  The same-type joint portion indicated by the circle mark 16 can use general-purpose joining means such as spot welding, and can secure joining efficiency and joining strength despite using the aluminum alloy structural member 10. Is a big advantage. The joint portion, the position and the number of joints with the inner panel steel plate 5 are appropriately selected according to the necessary joint strength as the reinforcing material and the design shape of each other. In some cases, as shown in the side sill mode of FIG. 4, the collar 14 made of a steel plate may be joined to the outer panel steel plate 1 together with the inner panel steel plate 5. In addition, in this aspect, the aspect which joins the structural member 10 made from an aluminum alloy, the inner panel steel plate 5, and the outer panel steel plate 1 only by the same kind joining part shown by (circle) 16 through the collar 14 made from a steel plate is shown. Yes. In addition to this aspect, in some cases, the aluminum alloy structural member 10 and the inner panel steel plate 5, the outer panel steel plate 1 and the like may be directly joined to each other without using the steel plate collar 14, but this is necessary. It is thin.

(Other aspects)
4 and 5 show a reinforcing mode such as a side sill or a roof side rail as another mode other than the center pillar and the like of the dissimilar material joined body of the present invention.

  In FIG. 4, the aluminum alloy structural member 10 is made of an aluminum alloy extruded hollow shape, unlike the panel shapes of FIGS. In other words, the hollow section 18 having a substantially U-shaped cross section and flanges 19 and 19 projecting laterally (vertical direction in the drawing) from each other are formed.

  By making the aluminum alloy structural member 10 into an extruded hollow shape in this way, it can be formed into a complicated shape, and the thickness can be increased to 3 mm or more, thereby increasing the reinforcing effect. Further, only the necessary portion of the extruded hollow member can be thickened, and the other portions can be thinned to reduce the weight.

  In the embodiment of FIG. 4 as well, as in the embodiment of FIG. 1, the collars 20 and 20 made of steel plate correspond to the shapes of the flanges 19 and 19 of the structural member 10 made of aluminum alloy, and are joined to the outer panel and the inner panel. It has a substantially L-shaped cross section or planar shape so that it is easy. The steel plate collars 20 and 20 may have a flat plate shape like the flanges 19 and 19.

  The steel plate collars 20, 20 are provided along the longitudinal direction of the aluminum alloy structural member 10. Of course, as shown in FIG. 3, the longitudinal direction of the aluminum alloy structural member 10 is provided. Therefore, a plurality of sheets may be provided with partial or partial intervals.

  In FIG. 5, the aluminum alloy structural member 10 is interposed as a reinforcing member in the space between the outer panel 1 and the inner panel 5 constituting the steel structural member. The same.

  In FIG. 5 or FIG. 4, the joint portion indicated by the mark 15 is a dissimilar material joint portion between the collars 20, 20 made of a steel plate and the flanges 19, 19 of the aluminum alloy structural member 10. Further, in FIG. 5, the joining portions indicated by ◯ marks 16 are the steel plate collar 20 in the aluminum alloy structural member 10, the flange 8 of the inner panel steel plate 5, and the flange portions of the flange 4 of the outer panel steel plate 1. It is a joint part of the same kind of steel materials.

  In addition, the outer panel 1 and the inner panel 5 in FIG. 5 are projected as necessary cross-sectional shapes such as a side sill or a roof side rail, and a vertical wall on both sides protruding from a side edge of the top and a vertical wall. The point which has the HAT type | mold cross section formed of the flange of both sides is the same as that of the said FIGS.

  In the embodiment described above, the case where the outer panel 1 and the inner panel 5 constituting the steel structural member are both made of a steel plate has been described. On the other hand, as another aspect, in order to reduce the weight of the steel structural member, any one of the outer panel 1 and the inner panel 5 may be an aluminum alloy plate panel. In this case, the steel plate collars 14, 17, and 20 in the aluminum alloy structural member 10 are bonded to only one of the outer panel 1 and the inner panel 5 on the side made of the steel plate, which are bonded to each other. Will be.

  According to the present invention, when an aluminum alloy structural member is made into a dissimilar material structural member joined to another steel structural member, it does not have a dissimilar material joining part between the aluminum alloy material and the steel material to be combined, or a dissimilar material joining part. Therefore, it is possible to provide an aluminum alloy structural member and a dissimilar material structural member that are less in number. Therefore, it is possible to easily make a composite material of a steel material and an aluminum material, and it is possible to expand the use of a different material structure member in an automobile body or the like.

It is a perspective view which illustrates the aspect of this invention different material structural member which joined this invention aluminum alloy structural member. It is sectional drawing of FIG. It is a perspective view which illustrates other modes of this invention dissimilar material structural member which joined this invention aluminum alloy structure member. It is a perspective view which illustrates other modes of a structural member made from an aluminum alloy of the present invention. FIG. 5 is a cross-sectional view illustrating an embodiment of the dissimilar material structural member of the present invention joined with the aluminum alloy structural member of FIG. 4.

Explanation of symbols

1: outer panel, 2: top, 3: vertical wall, 4: flange, 5: inner panel,
6: top, 7: vertical wall, 8: flange, 10: structural member made of aluminum alloy,
11: top, 12: vertical wall, 13: flange,
14, 17, 20: collar made of steel plate, 15: dissimilar material joint, 16: same kind joint,
18: Hollow part, 19: Flange

Claims (8)

A aluminum alloy structural member is interposed as a reinforcing member between the outer panel and the inner panel of the steel Sei構 forming member, the outer edge portion of the aluminum alloy material molded into the required shape of the structural member, made of steel The collar is preliminarily welded and joined, and the aluminum alloy structural member is assembled to the steel structural member, and then the outer panel of the steel structural member is connected to the steel structural collar. Both the inner panel and the steel plate collar are joined only, and the aluminum alloy structural member, the outer panel and the inner panel are joined directly to each other and do not have the different material joined portion. An automotive body structure member made of an aluminum alloy. The aluminum alloy automobile body structure member according to claim 1, wherein the aluminum alloy material is a plate material . The automobile body structure member made of aluminum alloy according to claim 1 , wherein the aluminum alloy material is an extruded profile . The aluminum alloy automobile body structure member according to claim 3 , wherein the aluminum alloy material is a hollow shape member. The thickness of the said aluminum alloy material is 3 mm or more, The automotive body structure member made from an aluminum alloy in any one of Claim 1 thru | or 4 . A dissimilar structural member of aluminum alloy structural member is joined with the steel structure according to any one of claims 1 to 5 aluminum alloy structural member outer panel and an inner constituting the steel structural member This aluminum alloy structural member is interposed between the panel and the panel, and a steel plate collar is integrally welded to the outer edge of the aluminum alloy material formed in the required shape as a structural member. After the aluminum alloy structural member is assembled to the steel structural member , both the outer panel and the inner panel of the steel structural member are connected to the steel structural member through the collar made of the steel plate. The aluminum alloy structural member, the outer panel and the inner panel are directly joined together. An automobile body dissimilar material structural member having no material joining portion . The vehicle body dissimilar material structural member according to claim 6 , wherein the dissimilar material structural member is selected from pillars, side sills, and roof side rails. The aluminum alloy structural member is manufactured in advance in a process different from the automobile body assembly process, and the aluminum alloy structural member is formed in the automobile body assembly process via the steel plate collar. automotive body dissimilar structural member I am according to claim 6 or 7 joined both towards and of the outer panel and the inner panel.

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