JP7227063B2 - metal structural member - Google Patents

Description

The present invention relates to a method for manufacturing a metal structural member and a metal structural member.

Conventionally, as disclosed in Patent Documents 1 and 2, for the purpose of improving the rigidity of structural members constituting a vehicle body, etc., metal plates are bonded together with an adhesive and the metal plates are joined together by spot welding. Weld bond construction method is known.

JP 2016-172528 A JP 2016-084010 A

In the weld bond method disclosed in Patent Documents 1 and 2, two metal plates are spot-welded with an adhesive interposed between them, thereby joining the metal plates together to form a metal structure. A member is produced. That is, the adhesive exists in the area where welding is performed (welding area) among the gap areas between the metal plates. Thus, in order to form a good nugget and secure the rigidity of the metal structural member in the presence of the adhesive in the welding area, the allowable It is thought that the range of welding conditions that can be applied becomes narrower.

An object of the present invention is to suppress the narrowing of the range of allowable welding conditions when joining metal plates using a joining method (for example, a weld bond method) that joins metal plates with an adhesive and welding. A metal structural member manufacturing method and a metal structural member capable of suppressing a decrease in rigidity of the metal structural member are provided.

As means for achieving the above object, the inventors focused on the shape of the metal plate around a specific area preset as the welding area. Specifically, when two metal plates are placed on top of each other with an adhesive applied to the inner surfaces of the metal plates, the adhesive receives pressure from the two metal plates and fills the space between the metal plates. It spreads all over and reaches the specific area. Therefore, by forming a groove around the specific region on the inner surface of the metal plate, the groove accommodates the adhesive that spreads toward the specific region when the metal plates are overlapped with the adhesive interposed therebetween. can do. This makes it possible to prevent the adhesive from entering the specific area. Moreover, when the groove has a structure in which the inner surface of the metal plate is recessed and the outer surface, which is the back surface of the metal plate, protrudes, the structure of the groove can increase the rigidity of the metal plate itself. to This makes it possible to suppress a decrease in rigidity of the entire metal structural member.

The present invention has been made from such a viewpoint. Provided is a method of manufacturing a metal structural member comprising: a first preparatory step of providing a first metal plate; a second preparatory step of providing a second metal plate; an arrangement step of placing an adhesive on the inner surface of at least one of the inner surface of the metal plate and the inner surface of the second metal plate; and a stacking step of stacking the first metal plate and the second metal plate. and a welding step of welding the stacked first metal plate and second metal plate in at least one predetermined specific region. The first metal plate prepared in the first preparation step has a grooved portion. The groove forming portion includes a concave surface that forms a part of the inner surface of the first metal plate and is recessed in one direction of the thickness of the first metal plate, and a concave surface that is the back surface of the inner surface of the first metal plate. and a convex surface that forms part of the outer surface and protrudes in one direction in the thickness direction in a region corresponding to the concave surface. The groove forming portion is formed so as to surround the at least one specific region. In the placement step, the adhesive is placed on the inner surface of the metal plate only in the outer region other than the grooved portion and the region surrounded by the grooved portion. A part of the adhesive that spreads toward the specific region when the first metal plate and the second metal plate are superimposed in the lamination step that is performed after the placement step is applied to the groove forming portion. receives a groove defined by said concave surface of .

According to this method of manufacturing a metal structural member, when the first metal plate and the second metal plate are superimposed in the laminating step, the adhesive receives pressure from the two metal plates and the gap is formed. Even if the region widens toward the specific region, the groove forming portion formed to surround the specific region in the first metal plate can accommodate the adhesive. This makes it possible to prevent the adhesive from entering the specific area. Therefore, in the present invention, it is possible to form a nugget portion with good welding quality in the specific region without narrowing the range of welding conditions as in the conventional art. When the adhesive is prevented from entering the specific region as described above, the bonding area between the metal plates by the adhesive is reduced, so that the rigidity of the entire metal structural member may be reduced. In the method for manufacturing a metal structural member of the present invention, the reduction in rigidity of the metal structural member is suppressed by increasing the rigidity of the first metal plate itself. That is, the grooved portion includes a concave surface in which a part of the inner surface of the first metal plate is recessed in the thickness direction of the first metal plate and a part of the outer surface of the first metal plate which is the back surface of the concave surface. has a convex surface protruding in the thickness direction. Such a structure of the grooved portion makes it possible to increase the rigidity of the first metal plate itself as compared with the case where the first metal plate is not provided with the grooved portion, thereby increasing the overall strength of the metal structural member. It makes it possible to suppress a decrease in rigidity. Therefore, in the present invention, when metal plates are joined using a joining method (for example, a weld bond method) for joining metal plates with an adhesive and welding, narrowing of the range of allowable welding conditions is suppressed. At the same time, it is possible to suppress a decrease in rigidity of the metal structural member.

In the first preparation step, it is preferable that the grooved portion is formed in the first metal plate so as to continuously surround the at least one specific region over the entire circumference.

In this aspect, the groove-forming portion accommodates the adhesive to perform the bonding, regardless of which direction the adhesive in the region outside the groove-forming portion spreads toward the specific region. It is possible to suppress the agent from entering the specific region.

A metal structural member of the present invention comprises: a first metal plate; a second metal plate overlapping the first metal plate; and between the inner surface of the first metal plate and the inner surface of the second metal plate and at least one nugget portion that is a welded portion between the first metal plate and the second metal plate. The first metal plate has a grooved portion surrounding the at least one nugget portion. The groove forming portion includes a concave surface that forms a part of the inner surface of the first metal plate and is recessed in one direction in the thickness direction of the first metal plate, and the first metal plate that is the back surface of the inner surface. and a convex surface that constitutes a part of the outer surface of and protrudes in one of the thickness directions. The adhesive layer includes an outer region other than the grooved portion and a region surrounded by the grooved portion, a region corresponding to the grooved portion, and between the grooved portion and the nugget portion. are located in the area of

In this metal structural member, the structure of the grooved portion having the concave surface and the convex surface enhances the rigidity of the first metal plate itself. Further, the grooved portion can accommodate the adhesive spreading toward the specific region corresponding to the nugget portion when manufacturing the metal structural member. For this reason, deterioration in welding quality of the nugget formed in the specific region is suppressed.

In the metal structural member, it is preferable that the groove forming portion surrounds the nugget portion continuously over the entire circumference.

In this aspect, the groove forming portion formed so as to continuously surround the nugget portion over the entire circumference has a higher density of the first metal than the groove forming portion intermittently surrounding the nugget portion. Increase the rigidity of the board itself. This makes it possible to further increase the stiffness of the overall metal structural member.
In the metal structural member, the second metal plate has a groove forming portion formed to surround the at least one nugget portion, and the groove forming portion of the second metal plate includes the a concave surface that forms part of the inner surface of the second metal plate and is recessed in one direction of the thickness of the second metal plate; and the second metal plate that is the back surface of the inner surface of the second metal plate and a convex surface that constitutes a part of the outer surface of the second metal plate and protrudes in one direction in the thickness direction in a region corresponding to the concave surface of the second metal plate.
In the metal structural member, the grooved portion of the second metal plate is formed at a position facing the grooved portion of the first metal plate in the thickness direction of the second metal plate. may

As described above, according to the present invention, when metal plates are joined using a joining method (for example, a weld bond method) for joining metal plates with an adhesive and welding, the range of acceptable welding conditions is It is possible to suppress a decrease in rigidity of the metal structural member while suppressing narrowing.

1 is a side view schematically showing a metal structural member according to an embodiment of the invention; FIG. It is a bottom view which shows typically the metallic structural member which concerns on the said embodiment. FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2; 1 is a perspective view schematically showing a part of steps in a method for manufacturing a metal structural member according to an embodiment of the present invention; FIG. FIG. 4 is a cross-sectional view schematically showing a part of steps in the method of manufacturing the metal structural member according to the embodiment; FIG. 4 is a perspective view schematically showing a part of steps in a method for manufacturing a metal structural member according to a comparative example; FIG. 5 is a cross-sectional view schematically showing a part of the steps in the method of manufacturing the metal structural member according to the comparative example; FIG. 4 is a side view showing a side door provided with the metal structural member according to the embodiment; FIG. 9 is an enlarged perspective view of the back surface of the area surrounded by the frame line IX in the inner panel of the side door shown in FIG. 8; FIG. 9 is an enlarged perspective view of the rear surface of the area surrounded by the frame line X in the inner panel of the side door shown in FIG. 8 ; FIG. 2 is a perspective view showing a vehicle body frame provided with the metal structural member according to the embodiment; FIG. 12 is a cross-sectional view taken along line XII-XII of FIG. 11; FIG. 12 is a cross-sectional view taken along line XIII-XIII of FIG. 11; 13 is a schematic diagram showing part of the B-pillar shown in FIG. 12, and is a side view when the B-pillar is viewed in the direction of arrow D1 in FIG. 12. FIG. FIG. 14 is a schematic diagram showing part of the roof side rail shown in FIG. 13, and is a side view when the roof side rail is viewed in the direction of arrow D2 in FIG. 13; FIG. 2 is a schematic diagram showing test materials used for calculations for comparing rigidity of metal structural members; It is a table|surface which shows the conditions of each test material. FIG. 5 is a schematic diagram for explaining the radius of the grooved portion, the diameter of the grooved portion, and the depth of the grooved portion; FIG. 5 is a schematic diagram for explaining a method of applying a load to a test material in the calculation for comparing the rigidity. 4 is a graph showing the results of calculating the rigidity of each test material. It is a graph which shows the relationship between the depth of a grooved part, and rigidity. It is a graph which shows the relationship between the diameter of a grooved part, and rigidity.

Preferred embodiments of the present invention will be described with reference to the drawings.

In the metal structural member according to the embodiment of the present invention, a first metal plate and a second metal plate are joined using a joining method (for example, a weld bond method) for joining metal plates with an adhesive and welding. It is a structural member. Therefore, the metal structural member of the present invention is widely applied to various structural members that can be produced using the joining method such as the weld bond method. The structural members include, for example, members constituting a vehicle body frame, panel parts, and the like in a vehicle such as an automobile. The vehicle body frame includes, for example, rockers, pillars, side members, roof side rails, and the like. The panel parts include side doors, hoods, trunks, and the like.

[Metal structural members]
1 to 3 of the metal structural member and FIGS. 4 to 7 showing a part of the steps in the method of manufacturing the metal structural member, the metal structural member and its manufacture will be described below. After describing the main features of the method, specific embodiments will be described with reference to FIGS.

1 is a side view schematically showing a metal structural member 100 according to an embodiment of the present invention, FIG. 2 is its bottom view, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. be.

As shown in FIGS. 1 to 3, the metal structural member 100 includes a first metal plate M1, a second metal plate M2, an adhesive layer 30, and a plurality of nugget portions 40. As shown in FIGS. The first metal plate M1 and the second metal plate M2 are joined to each other by the adhesive layer 30 and the plurality of nugget portions 40 in an overlapping state.

Each of the plurality of nugget portions 40 is a molten metal portion formed by spot-welding the first metal plate M1 and the second metal plate M2 to each other. The plurality of nugget portions 40 are formed in the metal structural member 100 at intervals.

As shown in FIG. 3 , the first metal plate M<b>1 has a plate-like parallel portion 11 and a plurality of grooved portions 12 . The second metal plate M2 has a plate-shaped parallel portion 21 .

The parallel portion 11 of the first metal plate M1 and the parallel portion 21 of the second metal plate M2 are plate-like portions facing each other in a parallel posture. The parallel orientation here means not only the case where the parallel portion 11 and the parallel portion 21 are arranged strictly in parallel, but also the variation in the thickness of the adhesive layer 30 and the molding accuracy of each of the metal plates M1 and M2. This includes the case where the parallel portion 11 and the parallel portion 21 are arranged at an angle due to dimensional variations and shape variations caused by . The adhesive layer 30 is interposed in most of the gaps between these parallel portions 11 and 21 .

FIG. 2 is a view of the metal structural member 100 when viewed in the thickness direction of the first metal plate M1, and FIG. It is a diagram when viewed from the As shown in FIG. 2, each of the plurality of grooved portions 12 of the first metal plate M1 extends around the nugget portion 40 when the first metal plate M1 is viewed in its thickness direction T. formed to surround. As shown in FIG. 3, a portion of each grooved portion 12 is one side of the thickness direction T (in FIG. 3, downward). That is, as shown in FIG. 3 , a portion of each grooved portion 12 protrudes toward one side (downward in FIG. 3 ) in the thickness direction T with respect to the nugget portion 40 .

Each of the plurality of grooved portions 12 of the first metal plate M1 is provided so as to continuously surround the entire circumference of the nugget portion 40 . Each grooved portion 12 has an annular shape surrounding the nugget portion 40 when the metal structural member 100 is viewed in the thickness direction T of the metal plate. In the schematic diagram shown in FIG. 2, each grooved portion 12 has an annular shape, but the shape of the grooved portion 12 is not limited to an annular shape as shown in various embodiments described later. Each grooved portion 12 may be provided to surround a single nugget portion 40 as shown in FIG. 2, or may be provided to surround a plurality of nugget portions 40 as shown in various embodiments described later. may have been Each grooved portion 12 is spaced apart from the nugget portion 40 surrounded by the grooved portion 12 .

As shown in FIG. 3, each grooved portion 12 constitutes a part of the inner surface S11 of the first metal plate M1 and is one side in the thickness direction T of the first metal plate M1 (lower side in FIG. 3). ) and a part of the outer surface S12 of the first metal plate M1, which is the back surface of the inner surface S11, and one side of the thickness direction T (lower side in FIG. 3) in a region corresponding to the concave surface SA. ). In the specific example shown in FIG. 3, each of the concave surface SA and the convex surface SB is configured by a semicircle in the cross-sectional view shown in FIG. 3, but the cross-sectional shapes of the concave surface SA and the convex surface SB are not limited to semicircles . Each of the concave surface SA and the convex surface SB may be composed only of curved surfaces, may be composed only of a plurality of flat surfaces, or may be composed of a combination of curved surfaces and flat surfaces.

The concave surface SA defines the groove of the groove forming portion 12 . The groove defined by the concave surface SA has a moat-like shape surrounding the nugget portion 40 . The groove of the groove forming part 12 is a space in which part of the adhesive can be accommodated when the metal structural member 100 is manufactured. The convex surface SB constitutes the outer surface of the grooved portion 12 projecting in one direction (downward in FIG. 3) in the thickness direction T with respect to the parallel portion 11 .

The adhesive layer 30 is arranged in a gap region R between the inner surface S11 of the first metal plate M1 and the inner surface S21 of the second metal plate M2.

Here, the gap region R can be classified into the following plurality of regions based on the nugget portion 40 and the grooved portion 12 . That is, as shown in FIG. 3, the gap region R is classified into a nugget region R1, an inner region R2, a groove region R3, and an outer region R4. The nugget region R1 is a region corresponding to the portion where the nugget portion 40 is formed. The groove region R3 is a region corresponding to the portion where the groove forming portion 12 is formed. The inner region R2 is a region inside the groove region R3 and is a region between the nugget region R1 and the groove region R3. The outer region R4 is a region outside the groove region R3. The outside is the side opposite to the nugget portion 40 with respect to the groove forming portion 12 .

In the embodiment shown in FIG. 3, the adhesive layer 30 is arranged in the outer area R4 and the groove area R3 of the gap area R, and is not arranged in the inner area R2. Therefore, the adhesive layer 30 is spaced apart from the nugget portion 40 . However, the adhesive layer 30 does not necessarily have to be arranged as described above. For example, the adhesive layer 30 may be arranged in the outer region R4, the groove region R3 and the inner region R2. Also, the adhesive layer 30 may be arranged only in the outer region R4.

The adhesive for forming the adhesive layer 30 is not particularly limited, but may be, for example, a structural adhesive. As the structural adhesive, for example, an adhesive containing an epoxy resin as a main component can be used.

The first metal plate M1 and the second metal plate M2 may be made of the same kind of metal, or may be made of different kinds of metals. Specifically, as a combination of the first metal plate M1 and the second metal plate M2, when both metal plates are steel plates, when both metal plates are aluminum plates, and when one metal plate is a steel plate, Examples include, but are not limited to, the case where the other metal plate is an aluminum plate.

Further, the aluminum plate may be, for example, an aluminum extruded material, an aluminum die-cast, or formed using other forming means. Specifically, one metal plate may be an extruded aluminum material, and the other metal plate may be a plate material (steel plate, aluminum plate, etc.) formed using other forming means. Alternatively, one of the metal plates may be aluminum die-cast and the other metal plate may be a plate material (steel plate, aluminum plate, etc.) formed using other forming means. The aluminum plate is made of, for example, an aluminum alloy. As the aluminum alloy, for example, a 5000 series aluminum alloy, a 6000 series aluminum alloy, a 7000 series aluminum alloy, or the like is used.

[Manufacturing method of metal structural member]
Next, a method for manufacturing the metal structural member 100 will be described. FIG. 4 is a perspective view schematically showing part of the steps in the method of manufacturing the metal structural member 100 according to the embodiment, and FIG. 5 is a cross-sectional view thereof. FIG. 6 is a perspective view schematically showing a part of steps in a method for manufacturing a metal structural member according to a comparative example, and FIG. 7 is a cross-sectional view thereof.

The manufacturing method of the metal structural member 100 includes a first preparation process, a second preparation process, an arrangement process, a stacking process, and a welding process.

The first preparation step is a step of preparing the first metal plate M1, and the second preparation step is a step of preparing the second metal plate M2. In the first preparation step, the first metal plate M1 having the plurality of grooved portions 12 is formed, and in the second preparation step, the second metal plate M2 is formed. Each of the first metal plate M1 and the second metal plate M2 is formed using means such as press working and die casting. In the first preparatory step, each of the plurality of grooved portions 12 has a preset at least one groove in the first metal plate M1 when the first metal plate M1 is viewed in the thickness direction T. It is formed so as to surround one specific region RS. As shown in FIG. 5, a portion of each grooved portion 12 is formed at a position shifted in one direction (downward in FIG. 5) in the thickness direction T with respect to the specific region RS when viewed in the orthogonal direction. It is That is, as shown in FIG. 5, a portion of each grooved portion 12 protrudes in one direction (downward in FIG. 5) in the thickness direction T with respect to the specific region RS.

The specific region RS is a region where the first metal plate M1 and the second metal plate M2 are welded together in a welding process to be described later. In the schematic diagrams shown in FIGS. 4 and 5, each groove-forming portion 12 is provided so as to surround a single specific region RS. may be provided so as to surround the When the first metal plate M1 is viewed in the thickness direction T, the specific region RS is a region located inside the groove-forming portion 12, and the area of the region surrounded by the groove-forming portion 12 is It is a region having a smaller area (area when viewed in the thickness direction T) than the . The specific region RS is a region located inside the grooved portion 12 with a gap therebetween. The specific region RS is a region that substantially matches the region R1 corresponding to the portion where the nugget portion 40 is formed, but does not necessarily have to match exactly. This is because each spot welding is performed with the specific region RS as a target, but the welding position may vary slightly due to various manufacturing factors.

The placement step is a step of placing an adhesive on the inner surface of at least one of the first metal plate M1 and the second metal plate M2. In this embodiment, as shown in FIGS. 4 and 5, the adhesive 30A is arranged on the inner surface of one metal plate. Specifically, for example, on the inner surface S11 of the first metal plate M1, the adhesive 30A is applied in rows (lines) consisting of a plurality of rows spaced apart from each other. At this time, the area where the adhesive 30A is arranged is only the outer area R4A of the inner surface S11 of the first metal plate M1. The outer region R4A of the first metal plate M1 is a region corresponding to the outer region R4 of the metal structural member 100 shown in FIG. That is, the outer region R4A is a region of the inner surface S11 of the first metal plate M1 outside the region where the grooved portion 12 is formed. The outer side is the side opposite to the specific region RS with respect to the grooved portion 12 .

Similarly, when the adhesive 30A is arranged on the inner surface S21 of the second metal plate M2, the area where the adhesive 30A is arranged is, of the inner surface S21 of the second metal plate M2, Only the outer region R4A. The outer region R4A of the second metal plate M2 is a region corresponding to the outer region R4 of the metal structural member 100 shown in FIG. That is, the outer region R4A of the second metal plate M2 is the inner surface S21 of the second metal plate M2 where the grooved portion 12 of the first metal plate M1 in the state where the metal plates M1 and M2 are stacked is This area corresponds to the area outside the formed area.

The stacking step is, as shown in FIGS. 4 and 5, a step of stacking the first metal plate M1 and the second metal plate M2. In the lamination step, when these metal plates M1 and M2 are overlapped, the adhesive 30A is applied to the gap region R between the inner surface S11 of the first metal plate M1 and the inner surface S21 of the second metal plate M2. placed.

The initial stage of this lamination process, that is, the stage before the adhesive 30A placed in the gap region R is pressed by the metal plates M1 and M2, is shown in the upper diagram of FIG. 4 and the upper diagram of FIG. Thus, the adhesive 30A retains its linear shape when applied to the inner surface of the metal plate in the placement step.

Next, in the stacking step, the metal plates M1 and M2 are pressed in a direction toward each other. As a result, the adhesive 30A is pressed by the metal plates M1 and M2 and spreads in the gap region R, as shown in the middle diagram of FIG. 4 and the middle diagram of FIG. In the present embodiment, since the first metal plate M1 is formed with the groove forming portion 12 surrounding the specific region RS, the adhesive that advances toward the specific region RS in the gap region R When 30A reaches the grooved portion 12, it is accommodated in the groove defined by the concave surface SA of the grooved portion 12. As shown in FIG. This prevents the adhesive 30A from reaching the specific region RS.

On the other hand, in the method of manufacturing a metal structural member according to the comparative example shown in FIGS. The adhesive 30A advancing toward the specific region, which is the welding region, in the gap region between the first metal plate M11 and the second metal plate M12 reaches the specific region.

The welding step is a step of spot-welding the superimposed first metal plate and the second metal plate in the specific region RS. As shown in FIGS. 4 and 5, in the manufacturing method according to the present embodiment, since the adhesive 30A is suppressed from entering the specific region RS in the lamination step, in the welding step, the specific region RS Metal plates M1 and M2 are spot-welded to each other in the absence of adhesive 30A. As a result, a nugget portion 40 with good welding quality is formed in the specific region RS.

The main features of the metallic structural member 100 and the method of manufacturing the same have been described above. Below, referring to FIGS. The metal structural members 101 and 102 and the metal structural members 103 and 104 forming part of the frame of the vehicle body will be described as an example.

[Side door]
FIG. 8 is a side view showing a side door 60 provided with metal structural members 101 and 102 according to the embodiment. 9 is an enlarged perspective view of the back surface of the area surrounded by the frame line IX in the inner panel 63 of the side door 60 shown in FIG. 8. FIG. 10 is an enlarged perspective view of the inner panel 63 of the side door 60 shown in FIG. It is the perspective view which expanded the back surface of the area|region enclosed by the frame line X.

The side door 60 is a member rotatably attached to the frame of the vehicle body by two hinge portions 61 and 62 . The two hinge portions 61 and 62 are vertically spaced apart from each other at the front end portion of the side door 60 .

The side door 60 includes an inner panel 63, an outer panel (not shown) provided outside the inner panel 63 (outside in the vehicle width direction), and a plurality of reinforcements. Each of the plurality of reinforcements is provided to reinforce the side door. As shown in FIGS. 9 and 10, the plurality of reinforcements includes two hinge reinforcements 64 and 65 for reinforcing the two hinge portions 61 and 62. As shown in FIGS. Each of the inner panel 63 and the hinge reinforcement 64 can be produced, for example, by press-molding a single panel.

The side door 60 includes a metallic structural member 101 shown in FIG. 9 and a metallic structural member 102 shown in FIG.

As shown in FIG. 9, the hinge reinforcement 64 that reinforces the upper hinge portion 61 corresponds to the first metal plate M1 shown in FIGS. A portion corresponds to the second metal plate M2 shown in FIGS. The metal structural member 101 includes a hinge reinforcement 64 (the first metal plate M1), a portion of the inner panel 63 (the second metal plate M2), an adhesive layer 30, and a plurality of nugget portions 40. , provided.

Further, as shown in FIG. 10, the hinge reinforcement 65 that reinforces the lower hinge portion 62 corresponds to the first metal plate M1 shown in FIGS. A portion of 63 corresponds to the second metal plate M2 shown in FIGS. The metal structural member 102 includes a hinge reinforcement 65 (the first metal plate M1), a portion of the inner panel 63 (the second metal plate M2), an adhesive layer 30, and a plurality of nugget portions 40. , provided.

In each of these metal structural members 101 and 102, the first metal plate M1 has a parallel portion 11 and a plurality of grooved portions 12, and the second metal plate M2 has a parallel portion 21. have The main features of the parallel portion 11 and the plurality of grooved portions 12 of the first metal plate M1 and the parallel portion 21 of the second metal plate M2 are the metal plates described with reference to FIGS. Similar to structural member 100 . 1 to 3 are denoted by the same reference numerals in FIGS. 9 and 10, and detailed description thereof will be omitted.

In the metal structural member 101 shown in FIG. 9, the hinge reinforcement 64 has an uneven shape along the uneven shape of a part of the inner panel 63 facing it. Of the plurality of grooved portions 12 in the hinge reinforcement 64, each of the grooved portions 121 to 124 is formed in the hinge reinforcement 64 so as to surround the plurality of nugget portions 40, and the grooved portion 125 is formed in the hinge reinforcement 64 so as to surround the single nugget portion 40 . Each of the grooved portions 121 to 124 has a shape extending substantially in the vertical direction, and a plurality of nugget portions 40 surrounded by the grooved portion are arranged substantially vertically at intervals.

In the metal structural member 102 shown in FIG. 10, the hinge reinforcement 65 has an uneven shape along the uneven shape of a part of the inner panel 63 facing it. Of the plurality of grooved portions 12 in the hinge reinforcement 65, each of the grooved portions 121 and 122 is formed in the hinge reinforcement 65 so as to surround the plurality of nugget portions 40, and the grooved portion Each of 123 to 129 is formed in hinge reinforcement 65 so as to surround single nugget portion 40 . The grooved portion 121 has a shape extending substantially vertically, and the plurality of nugget portions 40 surrounded by the grooved portion 121 are arranged substantially vertically at intervals. The groove-forming portion 122 has a shape extending substantially in the front-rear direction, and the plurality of nugget portions 40 surrounded by the groove-forming portion 122 are arranged at intervals in the front-rear direction.

[Car body frame]
11 is a perspective view showing the frame 200 of the vehicle body, FIG. 12 is a cross-sectional view taken along line XII-XII of FIG. 11, and FIG. 13 is a cross-sectional view taken along line XIII-XIII of FIG.

The automobile frame 200 shown in FIG. 11 includes a metallic structural member 103 and a metallic structural member 104 . The metal structural member 103 is a structural member that constitutes part or all of a so-called B-pillar. The metal structural member 103 is positioned on the side of the frame 200 of the vehicle body, positioned substantially in the center in the front-rear direction, and is a long structural member extending in the vertical direction. 104 are connected. The metal structural member 104 is a roof side rail (A pillar). The roof side rail 104 is an elongated structural member that extends along the sides of the roof and the front window of the automobile frame 200 and connects the front and rear parts of the vehicle body.

As shown in FIGS. 12 and 13, each of the metal structural members 103, 104 has a closed cross-sectional structure.

The metal structural member 103 shown in FIG. 12 has a first member 71 , a second member 72 and a third member 73 . Each of these members 71 to 73 is a metal plate extending along the longitudinal direction of the metal structure member 103 . These members 71, 72, 73 are joined by a weld bond method using an adhesive and welding. Specifically, it is as follows.

The first member 71 has a body portion 71A and a pair of flange portions 71B and 71C located on both sides of the body portion 71A in the width direction. The second member 72 has a body portion 72A and a pair of flange portions 72B and 72C located on both sides of the body portion 72A in the width direction. The third member 73 has a body portion 73A and a pair of flange portions 73B and 73C located on both sides of the body portion 73A in the width direction. The body portion 71A of the first member 71 is positioned substantially on the same plane as the flange portions 71B and 71C on both sides. The body portion 72A of the second member 72 has a shape that protrudes laterally with respect to the pair of flange portions 72B and 72C. The body portion 73A of the third member 73 has a shape that protrudes laterally with respect to the pair of flange portions 73B and 73C, and is arranged to cover the outside of the body portion 72A of the second member 72. It is

The pair of flange portions 71B and 71C of the first member 71 are joined to the pair of flange portions 72B and 72C of the second member 72 by a weld bond method using an adhesive and welding. A body portion 71A of the second member 71 and a body portion 72A of the second member 72 form a closed cross section. The body portion 72A of the second member 72 is joined to the body portion 73A of the third member 73 by a weld bond method using an adhesive and welding.

13 has a first member 81, a second member 82, and a third member 83. The metal structural member 104 shown in FIG. Each of these members 81 to 83 is a metal plate extending along the longitudinal direction of the metal structure member 104 . These members 81, 82, 83 are joined by a weld bond method using an adhesive and welding. Specifically, it is as follows.

The first member 81 has a body portion 81A and a pair of flange portions 81B and 81C located on both sides of the body portion 81A in the width direction. The second member 82 has a body portion 82A and a pair of flange portions 82B and 82C located on both sides of the body portion 82A in the width direction. The third member 83 has a body portion 83A and a pair of flange portions 83B and 83C located on both sides of the body portion 83A in the width direction. The body portion 81A of the first member 81 has a shape that protrudes laterally with respect to the flange portions 81B and 81C on both sides. The main body portion 82A of the second member 82 has a shape that protrudes laterally (opposite to the direction in which the main body portion 81A protrudes) with respect to the pair of flange portions 82B and 82C. The body portion 83A of the third member 83 has a shape that protrudes laterally (opposite to the projecting direction of the body portion 81A) with respect to the pair of flange portions 83B and 83C. The second member 82 is arranged between the first member 81 and the third member 83 .

The pair of flange portions 81B and 81C of the first member 81 are joined to the pair of flange portions 82B and 82C of the second member 82 by a weld bond method using an adhesive and welding. A body portion 81A of the second member 81 and a body portion 82A of the second member 82 form a closed cross section. The pair of flange portions 82B and 82C of the second member 82 are joined to the pair of flange portions 83B and 83C of the third member 83 by a weld bond method using an adhesive and welding. A body portion 82A of the third member 83 and a body portion 83A of the third member 83 form a closed cross section.

12 and 13 as described above are joined by the weld bond method in the same manner as the joint structure described with reference to FIGS. For example, the joint portion between the flange portion 71B and the flange portion 72B in the metal structural member 103 of FIG. 12 will be described as follows.

As shown in FIG. 12, at the joint portion (lower left portion in FIG. 12) between the flange portion 71B and the flange portion 72B in the metal structural member 103, the flange portion 71B is the first metal in FIGS. The flange portion 72B, which is a metal plate corresponding to the plate M1 and overlaps the flange portion 71B, is a metal plate corresponding to the second metal plate M2 in FIGS. The joint portion between the flange portion 71B and the flange portion 72B in the metal structural member 103 is composed of an adhesive layer 30 arranged between the inner surface of the flange portion 71B and the inner surface of the flange portion 72B, the flange portion 71B and the flange portion 72B. and a plurality of nugget portions 40 that are welded portions with portion 72B. The flange portion 71B as the first metal plate has a grooved portion 12 formed to surround the nugget portion 40 . The groove forming portion 12 constitutes a part of the inner surface of the flange portion 71B as the first metal plate and includes a concave surface SA recessed in one direction of the thickness of the flange portion 71B, and A convex surface SB that constitutes a part of the outer surface of the flange portion 71B and protrudes in one direction in the thickness direction in a region corresponding to the concave surface SA. The adhesive layer 30 is arranged in the outer region R4 and the groove region R3 (see FIG. 3) in the gap region R between the inner surface of the flange portion 71B and the inner surface of the flange portion 72B. It is not arranged in R2 (see FIG. 3). Therefore, the adhesive layer 30 is spaced apart from the nugget portion 40 .

14 is a schematic view of the metal structural member 103 viewed in the direction of arrow D1 shown in FIG. 12, and FIG. 15 is a schematic view of the metal structural member 104 viewed in the direction of arrow D2 shown in FIG. It is a schematic diagram of. As shown in the schematic diagram of FIG. 14, in the metal structural member 103, each of the flange portions 71B and 71C as the first metal plate M1 is formed to surround the plurality of nugget portions 40. The grooved portion 12 extends approximately vertically. Further, as shown in the schematic diagram of FIG. 15, in the metal structural member 104, each of the flange portions 81B and 81C as the first metal plate M1 has a plurality of grooved portions 12, Each grooved portion 12 is formed to surround a single nugget portion 40 .

[Summary of embodiment]
As described above, according to the method for manufacturing a metal structural member according to the embodiment, when the first metal plate M1 and the second metal plate M2 are stacked in the stacking step, the adhesive 30 formed to surround the specific region RS in the first metal plate M1 even if the gap region R receives pressure from the two metal plates and spreads toward the specific region RS. The grooved portion 12 can accommodate the adhesive. This makes it possible to prevent the adhesive from entering the specific region RS. Therefore, it is possible to form the nugget portion 40 with good welding quality in the specific region RS without narrowing the range of welding conditions as in the conventional art. If the adhesive is prevented from entering the specific region RS as described above, the bonding area between the metal plates by the adhesive is reduced, and the rigidity of the entire metal structural member may be reduced. In the method for manufacturing a metal structural member according to the embodiment, the decrease in rigidity of the metal structural member is suppressed by increasing the rigidity of the first metal plate M1 itself. That is, the groove forming portion 12 constitutes a part of the inner surface of the first metal plate M1 and includes a concave surface SA recessed in one direction of the thickness direction T of the first metal plate M1 and the back surface of the inner surface. It has a convex surface SB that constitutes a part of the outer surface of the first metal plate M1 and protrudes in one direction in the thickness direction T. As shown in FIG. Such a structure of the grooved portion 12 makes it possible to increase the rigidity of the first metal plate M1 itself as compared with the case where the grooved portion 12 is not provided in the first metal plate M1. It is possible to suppress a decrease in rigidity of the entire structural member. Therefore, in the above-described embodiment, when metal plates are joined using a joining method such as a weld bond method in which metal plates are joined by an adhesive and welding, the range of allowable welding conditions is not narrowed. While suppressing this, it is also possible to suppress a decrease in the rigidity of the metal structural member.

In the embodiment, in the first preparation step, the grooved portion 12 is formed in the first metal plate M1 so as to continuously surround the at least one specific region RS over the entire circumference. . Therefore, even if the adhesive in the region outside the groove forming part 12 spreads from any direction toward the specific region RS, the groove forming part 12 accommodates the adhesive and It is possible to suppress the adhesive from entering the specific region RS.

In the metal structural member according to the embodiment, the grooved portion 12 constitutes a part of the inner surface S11 of the first metal plate M1 and is recessed in one direction of the thickness direction T of the first metal plate M1. It has a concave surface SA and a convex surface SB that constitutes a part of the outer surface S12 of the first metal plate M1, which is the back surface of the inner surface S11, and protrudes in one direction in the thickness direction. The structure of the grooved portion 12 having the concave surface and the convex surface increases the rigidity of the first metal plate M1 itself. Further, the groove forming portion 12 can accommodate the adhesive spreading toward the specific region RS corresponding to the nugget portion 40 when manufacturing the metal structural member. Therefore, deterioration of welding quality of the nugget portion 40 formed in the specific region RS is suppressed.

In the metal structural member, the adhesive layer 30 is spaced from the nugget portion 40 in a gap region R between the inner surface S11 of the first metal plate M1 and the inner surface S21 of the second metal plate M2. and a portion of the adhesive layer 30 is disposed within the groove defined by the concave surface SA of the grooved portion 12 . Since a part of the adhesive layer 30 is arranged in the groove of the groove forming portion 12 in this way, the first metal plate M1 and the second metal plate M2 are joined by the adhesive 30. is ensured in the grooved portion 12 as well. As a result, the bonding area between the metal plates with the adhesive is suppressed from being reduced due to the provision of the grooved portion 12 . Further, in the above embodiment, the adhesive layer 30 is arranged with a gap from the nugget portion 40 . That is, when the metal structural member is manufactured, the adhesive is accommodated in the grooved portion 12, thereby suppressing the spread of the adhesive, so that the adhesive does not enter the specific region RS. The plates are welded together. Therefore, since the nugget portion 40 of the metal structural member is formed without being affected by the adhesive, deterioration of welding quality of the nugget portion 40 is suppressed.

[Characteristic evaluation]
Next, the results of evaluating the properties of the metal structural member according to the embodiment of the present invention by CAE analysis will be described. FIG. 16 is a schematic diagram showing metal structural members (test materials A to D) according to embodiments of the present invention used for the evaluation. Each of these test materials A to D has a grooved portion 12 provided in the first metal plate M1. Note that the unit of numerical values in FIG. 16 is mm (except for reference numeral 12).

FIG. 17 is a table showing evaluation conditions such as dimensions of test materials. As shown in the table of FIG. 17, test materials named "Case 0-0", "Case 0-1" and "Case 0-2" were used as comparative examples. The test materials according to these comparative examples were not provided with the grooved portion. In the name of "Case" in the leftmost column of the table, the test materials from the 4th row to the 8th row are the test material A, and they differ in the depth of the grooved part and the diameter of the grooved part. It is set.

FIG. 18 is a schematic diagram for explaining the radius of the grooved portion, the depth of the grooved portion, and the diameter of the grooved portion among the evaluation conditions. The radius R of the grooved portion is the radius of curvature of the arc showing the outer surface of the grooved portion 12 in the schematic sectional view of FIG. The diameter φ of the grooved portion in FIGS. 17 and 18 is the distance indicated by the arrow in FIG. FIG. 19 is a schematic diagram for explaining a method of applying a load to the test material in the evaluation. As shown in FIG. 19, in this evaluation, a first metal plate M1 provided with the grooved portion 12 and a second metal plate M2 (flat plate) not provided with the grooved portion 12 were overlapped and joined. , Rigidity was calculated by CAE analysis simulating a three-point bending test performed with the first metal plate M1 facing downward (on the back side).

The graph in FIG. 20 shows the results of calculating the rigidity of each test material under the above evaluation conditions. As shown in FIG. 20, the test materials A to D having the grooved portion 12 are less rigid than the test material (Case 0-2) which does not have the grooved portion. In particular, the test materials C and D are remarkably improved in rigidity compared to the test material (Case 0-2). Specifically, it is as follows.

Compared with the test material (Case 0-1) which was only spot-welded, the test materials (Case 0-0, Case 0-2) to which the adhesive was applied showed a large increase in deformation load. However, when the test material (Case 0-0) and the test material (Case 0-2) are compared, it can be seen that the combined use of the adhesive and spot welding has a small rigidity improvement effect.

It can be seen that the test materials A to D provided with the grooved portion 12 can secure rigidity equal to or greater than that of the three comparative test materials (Case 0-0, Case 0-1, Case 0-2).

It can be seen that the test materials C and D, in which the grooved portion 12 is arranged in a direction orthogonal to the three-point bending direction, have particularly high rigidity. This is because the secondary moment of area in the vicinity of the load application point is increased by providing the grooved portion 12 as in the test materials C and D.

Of the test materials A to D provided with the grooved portion 12, the test material B had the lowest rigidity. This is presumed to be because the two grooved portions 12 are arranged parallel to the bending direction in the test material B, and the portion between the two grooved portions 12 serves as a bending starting point during deformation. .

Comparing test material C and test material D, test material C has higher rigidity. It is presumed that this is because the end portion of the small grooved portion 12 inside the test material D serves as the starting point of bending during deformation.

FIG. 21 shows the load-displacement curves of three test materials A (Case A-d1-φ25, Case A-d3-φ25, Case A-d5-φ25) in which the depth of the grooved portion 12 is varied. As shown in FIG. 21, the rigidity is improved by increasing the depth of the grooved portion 12 . However, it can be seen that when the depth of the grooved portion 12 is 3 mm or more, the rigidity improvement effect is small. Therefore, it can be seen that a depth of 3 mm or more for the grooved portion 12 is sufficient.

FIG. 22 shows load-displacement curves of three test materials A (Case A-d3-φ20, Case A-d3-φ25, and Case A-d3-φ30) having grooved portions 12 with different diameters. As shown in FIG. 22, the effect of the diameter of the grooved portion 12 on the rigidity was small.

[Modification]
The invention is not limited to the embodiments described above. The present invention includes, for example, the following forms.

(A) Welding In the above embodiment, the welding for joining the first metal plate M1 and the second metal plate M2 was spot welding. good. That is, the method for manufacturing a metal structural member of the present invention includes not only an embodiment using a weld bond method in which metal plates are joined by adhesive and spot welding, but also an adhesive and other welding means (welding means other than spot welding). ) also includes an embodiment using a joining method for joining metal plates together.

(B) Groove-Forming Portion In the above-described embodiment, the groove-forming portion 12 is formed only in the first metal plate M1, but it is not limited to this. At least one grooved portion 12 may also be formed in the second metal plate M2. At least one grooved portion 12 may be formed in each of the first metal plate M1 and the second metal plate M2. In such a case, the grooved portion formed in the first metal plate M1 may be provided at a position facing the grooved portion formed in the second metal plate in the thickness direction T of the metal plate.

Further, in the above embodiment, the groove forming portion 12 is formed in the first metal plate M1 so as to continuously surround the specific region RS (nugget portion 40) over the entire circumference. However, it is not limited to this. The groove forming portion 12 is not formed in the first metal plate M1 so as to continuously surround the specific region RS (nugget portion 40) over the entire circumference, but rather the specific region RS (nugget portion 40). 40) may be intermittently formed on the first metal plate M1.

(C) Adhesive layer The metal structural member of the present invention includes one in which the adhesive layer is present in a region surrounded by the grooved portion. Specifically, it is as follows. When manufacturing the metal structural member of the present invention, the amount of the adhesive interposed in the region between the first metal plate and the second metal plate is more than an appropriate amount and exceeds the volume of the grooved portion. When the adhesive reaches the grooved portion, it is possible that the adhesive in excess of the volume enters the area surrounded by the grooved portion. Even in such a case, part of the adhesive is accommodated in the grooved portion when manufacturing the metal structural member of the present invention, so the amount of the adhesive entering the specific region is reduced. Therefore, in the metal structure member, the adhesive layer exists in a region corresponding to a portion surrounded by the grooved portion, specifically, in a region between the grooved portion and the nugget portion. In addition, deterioration in welding quality of the metal structural member is suppressed compared to a metal structural member that does not have the grooved portion.

(D) Placement step In the embodiment, the region where the adhesive is placed on the inner surface of the metal plate in the placement step is other than the region corresponding to the grooved portion and the portion surrounded by the grooved portion. is only the outer region of . In the method for manufacturing a metal structural member according to the reference example , in the placing step, the adhesive is placed on a region of the inner surface of the metal plate corresponding to the grooved portion and a portion surrounded by the grooved portion. may In the manufacturing method of the metal structural member of the reference example , in the arrangement step, the region corresponding to the grooved portion and the region surrounded by the grooved portion (specifically, for example, the inner region shown in FIG. 3 Even if a small amount of adhesive is placed in the region corresponding to R2), since the metal plate has the grooved portion, in the lamination step, the adhesive is removed from the region outside the grooved portion. The amount of adhesive that enters the specific area is reduced compared to conventional manufacturing methods that use metal plates that do not have grooves. Therefore, even in such a case, the metal structural member manufacturing method of the reference example suppresses narrowing of the range of allowable welding conditions compared to the conventional manufacturing method, and increases the rigidity of the metal structural member. There is an effect of suppressing the decrease. However, from the viewpoint of enhancing the effect, the area where the adhesive is placed on the inner surface of the metal plate in the placing step preferably corresponds to the specific area of the inner surface of the metal plate. It is only the area other than the area, and more preferably, it is only the outer area other than the area corresponding to the grooved portion and the portion surrounded by the grooved portion in the inner surface of the metal plate.

M1 First metal plate M2 Second metal plate R Gap region between the inner surface of the first metal plate and the inner surface of the second metal plate R4 Outer region of the gap region RS Specific region S11 First Inner surface of metal plate S12 Outer surface of first metal plate S21 Inner surface of second metal plate SA Concave surface in grooved portion of first metal plate SB Convex surface in grooved portion of first metal plate 12 Grooved portion 30 Adhesion Agent layer 30A Adhesive 40 Nugget part 100-104 Metal structural member

Claims (4)

A metal structural member,
a first metal plate;
a second metal plate overlapping the first metal plate;
an adhesive layer disposed between the inner surface of the first metal plate and the inner surface of the second metal plate;
At least one nugget portion that is a welded portion between the first metal plate and the second metal plate,
The first metal plate has a grooved portion formed to surround the at least one nugget portion,
The groove forming portion includes a concave surface that forms a part of the inner surface of the first metal plate and is recessed in one direction in the thickness direction of the first metal plate, and the first metal plate that is the back surface of the inner surface. and a convex surface that constitutes a part of the outer surface of and protrudes in one direction in the thickness direction in a region corresponding to the concave surface,
The adhesive layer includes an outer region other than the grooved portion and a region surrounded by the grooved portion, a region corresponding to the grooved portion, and between the grooved portion and the nugget portion. and a metallic structural member located in the region of A metal structural member according to claim 1 ,
The grooved portion is a metal structure member that continuously surrounds the nugget portion over the entire circumference. The metal structural member according to claim 1 or 2 ,
The second metal plate has a grooved portion formed to surround the at least one nugget portion,
The groove forming portion of the second metal plate includes a concave surface that forms a part of the inner surface of the second metal plate and is recessed in one direction of the thickness of the second metal plate, and the second metal plate. a convex surface forming part of the outer surface of the second metal plate, which is the back surface of the inner surface of the plate, and protruding in one direction in the thickness direction in a region corresponding to the concave surface of the second metal plate. , metal structural members. A metal structural member according to claim 3 ,
The metal structure member, wherein the grooved portion of the second metal plate is formed at a position facing the grooved portion of the first metal plate in the thickness direction of the second metal plate.

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