JP2003019979A - Tailored blank article for car body of vehicle and method of manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tailored blank article for a car body of a vehicle and its manufacturing method capable of reducing the number of metal molds for press working more than the conventional number, and capable of dispensing with special waterproof treatment for preventing generation of rust. SOLUTION: A dashboard lower panel 16 of the vehicle being the tailored blank article is manufactured by pressing a thick plate blank 11 and a thin plate blank 12 whose mutual superposed end parts are joined by mushroom welding. The thin plate blank 12 is bent until an inside surface becoming the cabin inside becomes a flush state or an almost flush state with the inside surface of the thick plate blank 11. An insulator panel 21 having a part straddling a mushroom welding part is joined to inside surfaces of these blanks 11 and 12, and the tailored blank article for the car body composed of these blanks is electrodeposited.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tailored blank article for a vehicle body of a vehicle manufactured from a tailored blank obtained by welding two blanks, and a method for manufacturing the same. As described above, the present invention can be applied to an article used at a location for partitioning the inside and outside or an article having a portion for partitioning the inside and the outside.

[0002]

BACKGROUND ART A dashboard panel of a vehicle is a partition member for partitioning the inside and the outside because it separates an engine room exposed to the outside air from a vehicle compartment that is shut off from the outside air. A conventional dashboard panel is formed by spot welding a lower panel made of a thick plate and an upper panel made of a thin plate, as disclosed in Japanese Utility Model Laid-Open No. 172678/1982.

In such a dashboard panel, a thick plate blank and a thin plate blank are pressed into a predetermined shape to produce a lower panel and an upper panel, these panels are joined by spot welding, and then the panels are joined together. It was manufactured by painting the entire gap while waterproofing the gap.

Conventionally, when a plurality of panels produced from blanks are spot-welded to produce a vehicle body article other than a dashboard panel, which is used as a partition between the interior and exterior of the vehicle, conventionally, It was manufactured through the same steps as the above dashboard panel.

[0005]

According to this conventional technique, spot welding is performed after a plurality of blanks are pressed to produce a plurality of panels having a predetermined shape. There is also a problem that it is necessary for each blank and the cost is high. Also, since the panels are not joined between multiple spot welds, a special waterproofing work process is required to prevent the formation of rust due to the entry of water droplets, thus improving productivity. There is also the problem that it cannot be done.

The object of the present invention is to make a tailored blank which can reduce the number of dies for press work as compared with the conventional one and can eliminate the need for a special waterproof treatment for preventing the generation of rust. An article and a method for manufacturing the article are provided.

[0007]

The tailored blank article according to the present invention comprises, as at least a part of two blanks, two blanks having overlapped ends joined by mash seam welding and pressed. Manufactured using
It is characterized in that the portion formed by the two blanks serves as a partition portion for partitioning the inside and the outside.

According to this tailored blank article,
Since the two blanks are joined by mash seam welding at the overlapped end portions, the press work for forming a predetermined shape is performed after the blanks are joined by mash seam welding. Therefore, it is not necessary to prepare a die for press work for each blank. Further, even if the part made up of two blanks is a part for partitioning the inside and the outside, the blanks are joined together without a gap by mash seam welding, and thus no special waterproofing process for preventing rust is required.

Further, according to this tailored blank article, since the blanks are joined by mash seam welding, the joining strength can be made larger than that of spot welding, and further, the overlapping margin of the end portions of the blanks can be made more than that of spot welding. Since the size can be reduced, weight reduction and material yield improvement can be achieved.

In this tailored blank article,
The two blanks are a thick plate blank and a thin plate blank, and mash seam welding is performed by superimposing the inner surface at the end of the thin plate blank on the outer surface exposed to the outside at the end of the thick plate blank. If so, the sheet blank may be bent until the inner surface of the sheet blank is flush or nearly flush with the inner surface of the plank blank.

By doing so, even if the two blanks are a thick plate blank and a thin plate blank having different thicknesses, the inner surfaces of these blanks are flush or almost flush with each other. The inner surface can be a mounting surface for mounting other components.

Further, the tailored blank article according to the present invention is manufactured by using as a material of at least a part of two blanks in which the abutted ends are joined by laser welding and pressed. It is characterized in that the portion formed by the two blanks serves as a partition portion for partitioning the inside and the outside.

In this tailored blank article, the two blanks are joined by laser welding at their abutted ends. Therefore, press working for forming a predetermined shape is performed after joining the blanks by laser welding. To do.
Therefore, even with this tailored blank article, it is not necessary to prepare a die for press working for each blank. Also, even if the part consisting of two blanks is the part that divides the inside and the outside, the blanks are joined together without gaps by laser welding, so as with the case of mash seam welding, special rust prevention is required. No need for waterproofing.

Further, in this tailored blank product, since the blanks are joined by laser welding, the joining strength can be made larger than that of spot welding, and further, unlike spot welding, it is not necessary to overlap the end portions of the blanks. It is possible to further reduce the weight and improve the material yield.

In this tailored blank article,
When the two blanks are a thick plate blank and a thin plate blank, and the surfaces of the outer faces of the thick plate blank and the thin plate blank that are exposed to the outside are flush or nearly flush, The thin blank may be bent until the inner surface of the thin blank is flush or nearly flush with the inner surface of the blank.

By doing so, even if the two blanks are a thick plate blank and a thin plate blank having different thicknesses, the inner surfaces of these blanks are flush with each other or are flush with each other. The inner surface can be a mounting surface for mounting other components.

In the above-mentioned tailored blank article produced by both mash seam welding and laser welding, when a connecting part to be joined to the outer surface across the welded part is provided, a part corresponding to the welded part in the connected part is provided. Keep away from the weld.

According to this, when the joining work is performed on at least the outer surface of the outer surface and the inner surface after joining the joined parts to the outer surface, the outer surface exposed to the outside is welded by mash seam welding. Parts, welded parts by laser welding can be painted reliably.

In the case where the inner surface of the tailored blank article is coated, and a joining part that straddles the welded portion by mash seam welding or the welded portion by laser welding is to be joined to this inner surface, The portion corresponding to the weld is also separated from the weld.

According to this, the same effect as the above-mentioned effect for the outer surface coating can be obtained for the inner surface coating.

A method for producing a tailored blank article according to the present invention is a method for producing a tailored blank article in which at least a portion consisting of a thick plate blank and a thin plate blank is a partitioning portion for partitioning the inside and the outside. The end of the thick plate blank and the end of the thin plate blank are joined to each other by mash seam welding by superimposing the inner surface of the thin plate blank on the outer surface exposed to the outside of the thick plate blank, and then pressing these blanks. Along with, the thin plate blank is bent until the inner surface of the thin plate blank is flush or nearly flush with the inner face of the thick plate blank, and then at least the thickness including the mash seam welded portion. The outer surface of the plate blank and the outer surface of the thin plate blank are coated.

According to this method for producing a tailored blank article, the blanks are joined by mash seam welding and then pressed to have a predetermined shape, so that it is necessary to prepare a die for pressing for each blank. There is no. Further, since the blanks are joined to each other by mash seam welding without a gap, it is not necessary to perform a special waterproof treatment for preventing rust. Furthermore, the blanks will be joined by mash seam welding with greater strength than spot welding, and since mash seam welding can reduce the overlap margin of the end portions of the blanks compared to spot welding, weight reduction will be achieved. And improvement in material yield can be achieved.

Further, according to the method for manufacturing the tailored blank article, even if the inner surface of the thin plate blank is overlapped with the inner surface of the thin plate blank by mash seam welding, the inner surface of the thin plate blank is Since the bending work is performed until the inner surface of the thick plate blank is flush or nearly flush with the inner surface of the blank, these inner surfaces can be used as mounting surfaces for mounting other components.

Further, the method for producing a tailored blank article according to the present invention is a method for producing a tailored blank article in which at least a part consisting of a thick plate blank and a thin plate blank is a partitioning part for partitioning the inside and the outside. , The ends of the thick plate blanks and the ends of the thin plate blanks that have been butted are joined by laser welding with the outer surfaces of these blanks being flush or nearly flush, and then these blanks are pressed. Along with working, the thin plate blank is bent until the inner surface of the thin plate blank is flush or nearly flush with the inner face of the thick plate blank, and then at least the thickness including the laser welded portion. The outer surface of the plate blank and the outer surface of the thin plate blank are coated.

According to this method for manufacturing a tailored blank article, blanks are joined by laser welding and then pressed to have a predetermined shape. Therefore, as in the case of mash seam welding, a die for pressing is used. Need not be prepared for each blank. Further, since the blanks are joined together by laser welding without any gap, it is not necessary to perform a special waterproofing treatment for preventing the generation of rust. Furthermore, blanks are joined by laser welding with greater strength than spot welding, and laser welding does not require overlapping the ends of the blanks unlike spot welding, thus further reducing the weight and improving the material yield. Can be achieved.

According to the method for producing a tailored blank article, the thin plate blank can be laser-welded with the outer surfaces of the thick plate blank and the thin plate blank being flush or nearly flush with each other. Bending is performed until the inner surface is flush or nearly flush with the inner surface of the thick plate blank, so these inner surfaces can be used as mounting surfaces for mounting other parts, as in the case of mash seam welding. .

In the above-described method for producing a tailored blank article by both mash seam welding and laser welding, when a connecting part to be joined to the outer surface of the tailored blank article across the welded portion is provided, bending is performed. After performing, but before painting, the mash seam welded part, the joint part having the part that straddles the laser welded part, on the outer surface of the thick plate blank and the outer surface of the thin plate blank, the mash seam welded part, the laser welded part. The above-mentioned portion straddling the slab is separated from the mash seam welded portion and the laser welded portion and joined, and then coating is performed.

In this way, even after the joining parts are joined to the outer surface and a painting operation is performed on the outer surface to ensure durability, the outer surface mash seam welded portion and laser welded portion can be reliably coated. Become. Therefore, the coating film can effectively prevent rust from being generated in the welded portion.

Further, when the inner surface of the thick plate blank and the inner surface of the thin plate blank are to be painted, and when joining a welded portion by mash seam welding or a welded portion by laser welding to these inner surfaces, The part corresponding to the welded part of the jointed part is separated from the welded part so that the jointed part is joined to the inner surface of the thick plate blank and the inner surface of the thin plate blank, and thereafter, the inner surface is coated.

According to this, the same effect as the above-mentioned effect can be obtained for the inner surface coating as well.

In the method for producing a tailored blank article by both mash seam welding and laser welding described above, a thin plate blank is prepared such that the inner surface of the thin plate blank is flush with or substantially flush with the inner face of the thick plate blank. Bending may be performed as one of the working steps of this pressing when pressing the joined thick plate blank and thin plate blank, and before or after pressing. It may be performed as a work process different from the processing.

Further, in the above-mentioned tailored blank article and the method for producing the same according to the present invention, a thin plate blank is bent until the inner surface of the thin plate blank is flush with or substantially flush with the inner face of the thick plate blank. Then,
For the place where the inner surface of the thick plate blank is a flat surface, the thin plate blank is bent to a position where the inner surface of the thin plate blank matches or almost matches the linear extension line of the inner surface of the thick plate blank. The inner surface of the thin plate blank is to be a flat surface, and the inner surface of the thick plate blank is a curved extension line of the inner surface of the thick plate blank when the inner surface of the thin plate blank is a curved surface. Bending is performed up to a position that coincides with or a position that substantially coincides with the inner surface of the thin plate blank to form a curved surface.

The blank that can be used in the above-described tailored blank-made article and the manufacturing method thereof according to the present invention is made of a metal plate, particularly a cold-rolled steel sheet or a hot-rolled steel sheet. INDUSTRIAL APPLICABILITY The present invention can be effectively applied to a steel plate having a thickness of 0.7 mm to 3.2 mm, and the steel plate may not be surface-treated by plating or the like, or may be surface-treated by galvanizing or the like. But it's okay. Further, in the present invention, it is possible to use steel plates of various strengths from mild steel plate to high-tensile steel plate of 690 MPA class.

In the present invention, the coating may be electrodeposition coating or spray coating.

The present invention can be applied to an article having at least a part for partitioning the inside and the outside. One example is a dashboard panel in the case of a vehicle body. Another example of the vehicle body of a vehicle is an article including a front wheel house and a front side frame, an article including a rear wheel house and a rear side panel inner, and the like.

When the tailored blank article according to the present invention is a dashboard panel, the lower material of the dashboard panel is a thick plate blank, the upper material is a thin plate blank, and the thin plate blank is The inner surface of the thin plate blank, which forms the vehicle interior space, is bent until the inner surface is flush with or substantially flush with the inner face of the thick plate blank.

According to this dashboard panel, since the material on the lower side is a thick plate blank, the strength of this portion is
It can be made large enough to receive the load from the front side frame in the event of a vehicle collision, and since the upper material is a thin plate blank, the weight of the entire dashboard panel can be reduced.

Further, according to this dashboard panel, the thick plate blank and the thin plate blank are in a continuous state or a substantially continuous state by the mash seam welding or the laser welding on the outer surfaces forming the engine room.
And since the thin plate blank is bent until the inner surface forming the vehicle interior space of the thin plate blank is flush or nearly flush with the inner face of the thick plate blank, the area around the welded portion of the dashboard panel is Unlike the case where the outer surface shape and the inner surface shape are reversed, it is possible to eliminate the formation of a recessed portion or a stepped portion on the outer surface on the engine room side where water drops are likely to accumulate. As a result, it is possible to prevent rust from being generated on the outer surface exposed to the outside.

In order to manufacture such a dashboard panel by the above-described method for manufacturing a tailored blank article, the material on the lower side of the dashboard panel is a thick plate blank and the material on the upper side is a thin plate blank. After joining the thick plate blank and the thin plate blank by mash seam welding or laser welding, the thin plate blank has an inner surface that forms a vehicle interior space of the thin plate blank is flush or nearly flush with the inner face of the thick blank. The bending process for bending up to is performed.

Further, the present invention can be applied to articles other than the vehicle body of a vehicle, such as an outer panel of a small boat, an inner panel of a washing tub, an outer panel of a television, an outer panel of a petroleum stove, an outer frame of a personal computer and the like. is there.

[0041]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The following embodiment is the case where the tailored article is a dashboard panel, particularly a dashboard lower panel, which forms the vehicle body of a vehicle.

1 to 10 show an embodiment in which mash seam welding is used. As shown in FIG. 1, the materials of the dashboard lower panel are a steel plate thick plate blank 11 and a thin plate blank 12, both ends 11A and 12A of these blanks 11 and 12 being joined by mash seam welding. When stacked, they are stacked as shown in FIG. As shown in FIG. 3, this stacking is performed with the thick plate blank 11 on the lower side and the thin plate blank 12 on the upper side. As a result, when the dashboard lower panel is formed by the thick plate blank 11 and the thin plate blank 12, the outer surface 11B of the thick plate blank 11, which is the engine room side and is the side exposed to the outside air, becomes the vehicle interior side. Then, the inner surface 12C of the thin plate blank 12 on the side shielded from the outside air is overlapped. In this state, the thick plate blank 11 and the thin plate blank 12 are clamped.

Ends 11A and 12A of the blanks 11 and 12
The mash seam welding device 13 for joining the
Upper and lower electrode rollers 13 that press and crush A and 12A
It has A and 13B. The electrode rollers 13A and 13B roll along the end portions 11A and 12A while being energized between the electrode rollers 13A and 13B. As a result, as shown in FIG. 4, the end portions 11A and 12A are crushed and joined while the nugget 14 is formed between the end portions 11A and 12A, whereby the end portions 11A and 12A are joined together. In this case, a mash seam weld 15 having a thickness smaller than the total thickness of the thick plate blank 11 and the thin plate blank 12 is formed. By this mash seam welding, the outer surface 11B of the thick plate blank 11 and the outer surface 12B of the thin plate blank 12, which are the surfaces of the dashboard lower panel on the engine room side, are brought into a continuous state or a substantially continuous state.

The tip edge portion 12D of the outer surface 12B of the thin plate blank 12 on the thick plate blank 11 side may be slightly stepped with respect to the outer surface 11B of the thick plate blank 11, but in a large stepped state. If so, it becomes difficult to form a coating film on the surface of the edge portion 12D when the electrodeposition coating described later is performed, and as a result, rust is generated from the edge portion 12D. Therefore, the edge portion 12
In order to prevent D from having a large step state, the pressure applied to the blanks 11 and 12 by the electrode rollers 13A and 13B during mash seam welding is set.

After that, the thick plate blank 11 and the thin plate blank 12 are sent to a pressing step for transfer press working. As a result, the thick plate blank 11 and the thin plate blank 12
The blanks 11 and 12 are processed into a predetermined shape by sequentially performing various processes such as drawing process, piercing process, and further trimming process, and the dashboard lower panel 16 shown in FIG. 5 is manufactured. FIG. 5 is a perspective view of the dashboard lower panel 16 viewed from the inside of the vehicle.

As one step in the transfer press working for manufacturing the dashboard lower panel 16, the bending of the thin plate blank 12 shown in FIG. 6 is performed.
This bending process is performed using the upper die 17 and the lower die 18,
Although the upper surface 18A of the lower die 18 is a smooth surface, the lower surface 17A of the upper die 17 is provided with a protruding portion 19 projecting downward at a position slightly displaced from the mash seam weld portion 15 toward the thin plate blank 12 side. There is. For this reason, the thin plate blank 12 is bent at the protrusion 19.

As a result, as shown in FIG. 7, the inner surface 11C of the thick plate blank 11 and the inner surface 12C of the thin plate blank 12 are flush or nearly flush. At the location of the thick plate blank 11 shown in FIG. 7, since the inner surface 11C of the thick plate blank 11 is a flat surface, the thin plate blank reaches a position that matches or almost matches the linear extension line of this inner surface 11C. 12 is bent, and the inner surface 12C of this thin plate blank 12 is also a flat surface. On the other hand, in the place where the inner surface 11C of the thick plate blank 11 is a curved surface, the thin plate blank 12 is positioned at or substantially at the position where the inner surface 12C of the thin plate blank 12 matches the curved extension line of the inner surface 11C of the thick plate blank 11. The inner surface 12C of the thin plate blank 12 is bent to a position to be formed, and the inner surface 12C of the thick plate blank 11 is removed except for the mash seam welded portion 15.
The curved surface has continuity with C.

When the upper die 17 and the lower die 18 are pressed, the bulging portion 15A of the mash seam welded portion 15 bulging from the inner surface 11C is pressed,
This bulge portion 15A may be eliminated.

Thus, the inner surface 1 of the thick plate blank 11
Dashboard lower panel 16 in which 1C and the inner surface 12C of the thin plate blank 12 are flush or nearly flush
After manufacturing, as shown in FIG. 8 showing the dashboard lower panel 16 viewed from the engine room side, on the outer surface 16A of the dashboard lower panel 16 composed of the outer surface 11B of the thick plate blank 11 and the outer surface 12B of the thin plate blank 12. Is a front side frame 2 which is a connecting component that is connected to the outer surface 16A over the mash seam welded portion 15.
0 is joined by spot welding. In addition, as shown in FIG. 9, the inner surface 16B of the dashboard lower panel 16 including the inner surface 11C of the thick plate blank 11 and the inner surface 12C of the thin plate blank 12 which are flush or nearly flush with each other, as shown in FIG. The insulator panel 21, which is a joint component that is joined across the seam welded portion 15, is joined by spot welding.

As shown in FIG. 9, the mash seam seam weld 1 in the front side frame 20.
Since the portion 20A corresponding to 5 is slightly curved in the direction away from the dashboard lower panel 16, the portion 20A is separated from the mash seam weld portion 15. Further, since the portion 21A of the insulator panel 21 corresponding to the mash seam welded portion 15 is also slightly curved in the direction away from the dashboard lower panel 16, this portion 21A is also mashed seam welded portion 15.
Away from.

As described above, after the front side frame 20 and the insulator panel 21 are attached to the dashboard lower panel 16, and further the dashboard upper panel, the front wheel house, etc. are attached, the vehicle body is completed. Dip in the bath of the electrodeposition coating device and perform electrodeposition coating. During this electrodeposition coating,
Even if a part of the mash seam welded portion 15 of the dashboard lower panel 16 is covered with the front side frame 20 and the insulator panel 21, a portion 20A corresponding to the mash seam welded portion 15 of the front side frame 21 , A portion 21 of the insulator panel 21 corresponding to the mash seam weld 15
Since A is not in close contact with the mash seam welded portion 15 and is separated from this welded portion 15, the electrodeposition coating liquid surely adheres to the mash seam welded portion 15. As a result, the surface of the mash seam welded portion 15 is coated by the electrodeposition coating 2
2 is reliably formed. Further, the coating film 22 is coated on the entire outer surface 16A of the dashboard lower panel 16 that is exposed to the outside on the engine room side.

According to the above embodiment, the dashboard lower panel 16 serving as a partition member for partitioning the vehicle compartment and the engine room, which are the inside and the outside of the vehicle, is
Ends 11A, 1 of the thick plate blank 11 and the thin plate blank 12
Since the 2A parts are joined by mash seam welding and then the thick plate blank 11 and the thin plate blank 12 are manufactured by pressing, the mold for this pressing process is a pressed thick plate blank and a thin plate blank. Unlike the case of manufacturing the dashboard lower panel by spot welding with each other, it is not necessary to prepare the thick plate blank 11 and the thin plate blank 12 separately. Therefore, the number of molds can be reduced, and the mold cost can be reduced. In addition, since the mash seam welding joins blanks together without leaving a gap, it is not necessary to perform a special waterproofing work for preventing rust from occurring on the manufactured dashboard lower panel 16 as a post-process, and the number of work processes is reduced accordingly. It can be reduced and productivity can be improved.

Further, since the mash seam welding has a larger joining strength than the spot welding, the thick plate blank 11 and the thin plate blank 12 can be joined with great strength. Further, in the mash seam welding, the overlap margin between the end portions 11A and 12A of the thick plate blank 11 and the thin plate blank 12 can be made smaller than that in the spot welding, so that the weight of the dashboard lower panel 16 can be reduced accordingly. The material yield can be improved.

Also, the outer surface 16A forming the engine room of the dashboard lower panel 16 according to this embodiment.
Since the inner surface 16B forming the vehicle interior space is covered with the coating film 22 formed by electrodeposition coating, the durability of the outer surface 16A and the inner surface 16B can be improved. In particular, by covering the outer surface 16A with the coating film 22, the durability of the outer surface 16A against moisture and rust can be improved even if water droplets such as rainwater hit the outer surface 16A exposed to the outside air.

Further, in the present embodiment, when the joined thick plate blank 11 and thin plate blank 12 are pressed, the thin plate blank 12 is bent so that the inner surface 12C of the thin plate blank 12 becomes an inner surface of the thick plate blank 11. 11C
The inner surface 16B of the dashboard lower panel 16 composed of these inner surfaces 11C and 12C is attached to the inner surface 16B of the mash seam weld 1
The insulator panel 21 straddling 5 can be attached as required. Also, the inner surface 1 of the thick plate blank 11
1C and the inner surface 12C of the thin plate blank 12 are also attached to a plurality of parts separately attached to these inner surfaces 11C.
Since 12C and 12C are flush or nearly flush, these components can be attached with one of the inner faces as the reference plane.

The front side frame 20 is attached to the inner surface 16 of the outer surface 16A of the dashboard lower panel 16.
Even if the insulator panel 21 is connected to the mash seam welded portion 15 in B, the portions 20A and 21A corresponding to the mash seam welded portion 15 are separated from the mash seam welded portion 15, and therefore electrodeposition coating is performed. The coating film 22 can be reliably formed on the surface of the mash seam welded portion 15, and rust can be prevented from occurring at the welded portion 15.

Further, according to this embodiment, the material under the dashboard lower panel 16 is the plank blank 11.
Therefore, the load from the front side frame 20 at the time of a vehicle collision can be effectively received by the portion including the thick plate blank 11. Moreover, since the material on the upper side of the dashboard lower panel 16 is the thin plate blank 12, the overall weight of the dashboard lower panel 16 can be reduced.

According to the present embodiment, the bending of the thin plate blank 12 shown in FIG. 6 is performed by the inner surface 12C which is the surface of the thin plate blank 12 on the vehicle interior side, as described with reference to FIG.
Is performed so as to be flush with or substantially flush with the inner surface 11C of the thick plate blank 11, so that the recess 23 formed between the thick plate blank 11 and the thin plate blank 12 shown in FIG.
Is formed on the inner surface 16B of the dashboard lower panel 16 on the vehicle interior side, and is not formed on the outer surface 16A of the dashboard lower panel 16 on the engine room side exposed to the outside air. Therefore, unlike the case where the recessed portion 23 is formed on the outer surface 16A of the dashboard lower panel 16, water droplets accumulate in the recessed portion 23 of the outer surface 16A exposed to the outside, which causes the dashboard lower panel after a long time has passed. The problem that rust is generated on 16 can be eliminated.

FIG. 10 shows a modification of the shape of the portion of the front side frame 20 corresponding to the mash seam welded portion 15. In this modified example, the portion 20B corresponding to the mash seam welded portion 15 has a shape that sharply separates from the dashboard lower panel 16, unlike the portion 20A in FIG. 9 that gradually separates from the dashboard lower panel 16. Has become.

Whether the portion of the front side frame 20 corresponding to the mash seam welded portion 15 has the shape shown in FIG. 9 or the shape shown in FIG. 10 depends on the ease of molding and the connection to the dashboard lower panel 16. It can be decided freely considering strength etc.

Next, an embodiment using laser welding will be described with reference to FIGS. 11 to 16.

As shown in FIG. 11, in the thick plate blank 31 and the thin plate blank 32, the outer surfaces 31B, 32B are flush or nearly flush with each other so that their end portions 31A, 32A are in contact with each other.
Butt and both blanks 31 and 3 in this state
2 is clamped. Oscillator 33A, condenser lens 33B
Light from a laser welding device 33 having 33C
The end portions 31A and 32A are welded and joined by.

FIG. 12 shows a thick plate blank 31 and a thin plate blank 32 after laser welding. The joints between the end portions 31A and 32A are laser welded portions 35, and the outer surface 31B of the thick plate blank 31 and the thin plate blank 31. 32 outer surface 32B
Is in a continuous state or a substantially continuous state.

The work performed thereafter is the same as in the case of the mash seam welding. That is, the dashboard lower panel 36 is manufactured from these blanks 31 and 32 by performing transfer press working on the thick plate blank 31 and the thin plate blank 32, and at the time of this transfer press working, the upper die 17 and the lower die of FIG. The bending process is performed on the thin plate blank 32 at 18. As a result, FIG.
As shown in, the inner surface 32C of the thin plate blank 32 is flush with or substantially flush with the inner surface 31C of the thick plate blank 31. Next, as shown in FIG. 15, the front side frame 20 is attached to the outer surface 36A of the dashboard lower panel 36, and the insulator panel 21 is attached to the inner surface 36B by spot welding. The portions 20A and 21A corresponding to the laser welded portions 35 of the front side frame 20 and the insulator panel 22 are separated from the welded portions 35.

After this, the dashboard lower panel 36
A vehicle body including the front side frame 20 and the like is electro-deposited and the outer surface 36A and the inner surface 36B of the dashboard lower panel 36 including the laser welded portion 35 are coated with the coating film 22.

Even in the case of this laser welding, the same effect as in the case of the above-mentioned mash seam welding can be achieved as compared with the case of spot welding. Among these effects, the recess 43 between the thick plate blank 31 and the thin plate blank 32 shown in FIG. 15 is formed on the inner surface 36B of the dashboard lower panel 36 on the vehicle interior side, and on the outer surface 36A of the engine room side. Since this is not formed, the effect that rust can be prevented from being generated on the outer surface 36A exposed to the outside for a long period of time is included.

In the case of laser welding, the end portions 31A, 32 of the thick plate blank 31 and the thin plate blank 32 are
Since it is not necessary to overlap A with each other, the weight of the dashboard lower panel can be further reduced, and the yield of materials can be improved.

Even in the case of this laser welding, FIG.
As shown in, the portion 20B of the front side frame 20 corresponding to the laser welded portion 35 may be shaped so as to be suddenly separated from the dashboard lower panel 36.

[0069]

According to the present invention, the number of molds for press working can be reduced as compared with the conventional one, and a special waterproof treatment for preventing rust can be eliminated. .

[Brief description of drawings]

FIG. 1 is a plan view showing a thick plate blank and a thin plate blank that are materials for manufacturing a vehicle dashboard lower panel according to an embodiment of the present invention.

FIG. 2 is a plan view showing a state in which ends of a thick plate blank and a thin plate blank are overlapped for mash seam welding.

FIG. 3 is a vertical cross-sectional view of a thick plate blank and a thin plate blank during mash seam welding.

FIG. 4 is a vertical cross-sectional view of a thick plate blank and a thin plate blank after mash seam welding.

FIG. 5 is a perspective view of a dashboard lower panel manufactured by transfer press working a thick plate blank and a thin plate blank joined by mash seam welding, as viewed from the vehicle interior side.

FIG. 6 is a vertical cross-sectional view showing when the thin plate blank is bent so that the inner surface of the thick plate blank and the inner surface of the thin plate blank are flush or nearly flush with each other.

FIG. 7 is a vertical cross-sectional view of a thick plate blank and a thin plate blank after bending.

FIG. 8 is a perspective view of a dashboard lower panel to which a front side frame is joined as seen from the engine room side.

FIG. 9 is a vertical cross-sectional view of a mash seam weld portion of a dashboard lower panel having a front side frame attached to an outer surface and an insulator panel attached to an inner surface.

10 is a view similar to FIG. 9 showing a modified example in which the portion of the front side frame corresponding to the mash seam welded portion has a different shape from FIG. 9.

FIG. 11 is a vertical cross-sectional view showing when a thick plate blank and a thin plate blank are joined by laser welding in an embodiment where a dashboard lower panel is manufactured from a thick plate blank and a thin plate blank joined by laser welding. .

FIG. 12 is a vertical cross-sectional view of a thick plate blank and a thin plate blank after laser welding.

FIG. 13 is a vertical cross-sectional view showing bending of a thin plate blank.

FIG. 14 is a vertical cross-sectional view of a thick plate blank and a thin plate blank after bending.

FIG. 15 is a vertical cross-sectional view of a laser welded portion of a dashboard lower panel having a front side frame attached to the outer surface and an insulator panel attached to the inner surface.

16 is a view similar to FIG. 15 showing a modified example in which the portion of the front side frame corresponding to the laser welded portion has a shape different from that in FIG. 15.

[Explanation of symbols]

11, 31 Thick plate blank 11A, 31A End part 11B, 31B Outer surface 11C, 31C Inner surface 12,32 Thin plate blank 12A, 32A End part 12B, 32A Outer surface 12C, 32C Inner surface 13 Mash seam welding device 15 Mash seam welding part 16, 36 Dashboard lower panels 16A, 36A outer surfaces 16B, 36B which are tailored blanks, inner surfaces 17, 18 upper and lower molds for bending 20 front which is an article joined to the outer surface of the dashboard lower panel on the engine room side Side frames 20A, 20B Portion 21 corresponding to welded portion Insulator panel 21A which is an article to be joined to the inner surface of the dashboard lower panel on the vehicle interior side 33 Portion corresponding to welded portion 33 Laser welding device 35 Laser welded portion

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroyuki Komatsu             2-14-8 Matsubara-cho, Akishima-shi, Tokyo Kikuchi             Press Industry Co., Ltd. (72) Inventor Noriyuki Yanase             2-14-8 Matsubara-cho, Akishima-shi, Tokyo Kikuchi             Press Industry Co., Ltd. (72) Inventor Koji Shimodo             1-4-1 Chuo Stock Market, Wako City, Saitama Prefecture             Inside Honda Research Laboratory (72) Inventor Kodama Kazumi             1-4-1 Chuo Stock Market, Wako City, Saitama Prefecture             Inside Honda Research Laboratory (72) Inventor Hirokazu Watanabe             1-4-1 Chuo Stock Market, Wako City, Saitama Prefecture             Inside Honda Research Laboratory (72) Inventor Fumiaki Niisato             1-4-1 Chuo Stock Market, Wako City, Saitama Prefecture             Inside Honda Research Laboratory F term (reference) 3D003 AA03 AA07 AA12 BB01 CA05

Claims (8)

[Claims] 1. A portion formed by two blanks, which is manufactured by using a thick plate blank and a thin plate blank in which overlapped ends are joined by mash seam welding and pressed, as at least a part of the material. Is a partition part for partitioning the inside and outside, and the mash seam welding is made by overlapping the inner surface at the end of the thin plate blank with the outer surface exposed to the outside at the end of the thick plate blank, and the thin plate blank. Is bent until the inner surface of the thin plate blank is flush with or substantially flush with the inner surface of the thick plate blank, and the inner surface of these blanks has a connecting part having a portion that straddles the mash seam weld. An article made of a tailored blank for a vehicle body, characterized in that 2. A thick plate blank and a thin plate blank, which are joined together by laser welding and pressed together and are pressed, are manufactured as at least a part of the material, and the part formed by the two blanks is It is a partition part for partitioning the inside and the outside, and the outer surfaces exposed to the outside of these thick plate blanks and thin plate blanks are flush or almost flush with each other, and the thin plate blank is The inner surface is bent until the inner surface of the plank blank is flush or nearly flush with the inner surface of the plank blank, and the inner surface of these blanks is joined with a coupling part having a portion straddling the laser weld. A tailored blank article for a vehicle body that features 3. The vehicle tailored blank article according to claim 1, wherein the plank blank is a lower material and the thin blank is an upper material, and An article made of a tailored blank for a vehicle body of a vehicle, characterized in that the inner surface of each of these blanks is a surface facing the vehicle interior. 4. An article made of a tailored blank for a vehicle body according to claim 3, which is a dashboard panel. 5. A method for producing a tailored blank article for a vehicle body of a vehicle, wherein at least a portion composed of a thick plate blank and a thin plate blank is a partitioning part for partitioning the inside and the outside, the method comprising: The end portion of the thin plate blank, the inner surface of the thin plate blank is overlaid on the outer surface exposed to the outside of the thick plate blank and joined by mash seam welding,
Then, while pressing these blanks,
The thin plate blank is bent until the inner surface of the thin plate blank is flush with or substantially flush with the inner face of the thick plate blank, and then the joining component having a portion that straddles the mash seam weld is A method for manufacturing a tailored blank article for a vehicle body of a vehicle, comprising: connecting an inner surface of a thick plate blank and an inner surface of the thin plate blank. 6. A method for producing a tailored blank article for a vehicle body of a vehicle, wherein at least a portion made up of a thick plate blank and a thin plate blank is a partition part for partitioning the inside and the outside, the end of the thick plate blank being abutted with each other. Part and the end of the thin plate blank, the outer surfaces exposed to the outside of these blanks are joined by laser welding in a flush state or a substantially flush state, and then these blanks are pressed, and The thin plate blank is bent until the inner surface of the thin plate blank is flush with or substantially flush with the inner surface of the thick plate blank, and then the joining component having a portion that straddles the laser weld is formed into the thick plate. A method for manufacturing a tailored blank article for a vehicle body of a vehicle, comprising bonding the inner surface of a blank and the inner surface of the thin plate blank. 7. The method of manufacturing a tailored blank article for a vehicle body according to claim 5, wherein the plank blank is a lower material and the thin blank is an upper material. And a method for manufacturing a tailored blank article for a vehicle body, characterized in that the inner surface of each of these blanks is a surface on the vehicle interior side. 8. A method of manufacturing a tailored blank article for a vehicle body according to claim 7, wherein the article for a vehicle tailored blank for a vehicle body is a dashboard panel.