JP3320817B2 - Automotive bumper beam and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bumper beam for reinforcing a vehicle bumper.

[0002]

2. Description of the Related Art In general, an automobile bumper is generally constituted by a bumper beam connected to a vehicle body and maintaining the strength of the bumper, and a resin skin material attached to the bumper beam to adjust the appearance of the vehicle body. I have. The bumper beam has been reduced in weight in order to reduce fuel consumption. In recent years, many bumper beams have been made of light alloys. For example, a bumper beam 1 shown as a perspective view in FIG. 10 and a cross-sectional view in FIG. 11 is an example of a bumper beam extruded from an aluminum material, and is a wall surface 2a of a reinforcing girder 2 extruded into a square cross section. An opening 3 for attaching a component such as a direction indicator, introducing cooling air to the radiator, a bolt insertion hole 4 for attaching a component, and the like are provided.

[0003]

However, the wall surface 2 of the reinforcing girder 2 extruded into a closed cross section as described above.
In the conventional method of manufacturing the bumper beam 1 for an automobile in which the opening 3 is provided in a, the processing for providing the opening 3 is not easy, the processing equipment becomes complicated, the equipment cost increases, and the number of processing steps increases, and the productivity increases. Could not be improved. In addition, since the material is removed, the yield of the material is low, and the production of the reinforcing girder of the bumper from an expensive light alloy material raises a problem that the cost increases. Therefore, the present invention has been made in view of the above-mentioned current situation, and has been made to be able to easily manufacture a bumper beam for an automobile, to reduce equipment cost and to reduce the number of processing steps. An object of the present invention is to improve the productivity and material yield to improve the manufacturing cost of a bumper beam.

[0004]

In order to solve the above-mentioned problems, a bumper beam for an automobile according to the first aspect of the present invention comprises a pair of opposing walls and one side of these walls.
A reinforcing girder having a wall for integrally connecting the cattle and extruded into a substantially U-shaped cross section, and a pair of the opposing
Ri Na and a plurality of reinforcing members for closing the opening of the recess and integrally connected to the other side each other wall extending in the extrusion direction of the reinforcing digits in part, these complementary between the plurality of reinforcing members
An opening surrounded by a strong member and the pair of walls is formed .

According to a second aspect of the present invention, there is provided a method of manufacturing a bumper beam for an automobile, in which a reinforcing girder is extruded into a substantially U-shaped cross section and extends in a direction in which the reinforcing girder is extruded. A reinforcing member is joined to the reinforcing girder so as to close the opening of the concave portion leaving a predetermined portion.

According to a second aspect of the present invention, there is provided a method of manufacturing a bumper beam for an automobile , comprising a pair of opposed walls.
A schematic having a wall connecting one side of these walls together
The reinforcing girder with a U-shaped cross section is extruded, and the
A plurality of reinforcing members for closing the opening of the recess extending eclipsed a pair of integrally connected to the extrusion direction of the <br/> reinforcing girder to the other side each other wall partially bonded to the reinforcing spar, wherein Multiple complements
Surrounded by the reinforcing member and the pair of walls between the strong members.
The opening is formed . Claim 3 of the present invention
The method for manufacturing a bumper beam for an automobile according to claim 2, wherein the manufacturing method according to claim 2, wherein the reinforcing girder is positioned in contact with a side surface of the reinforcing member on a wall surface of the reinforcing girder facing the recess. The protrusion is integrally formed by extrusion, and the reinforcing member is formed so that both end faces in the width direction thereof are abutted against the wall surface, and the reinforcing member is positioned while being brought into contact with the positioning protrusion. It is characterized in that both end surfaces are welded to the wall surface.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a bumper beam for an automobile according to the third aspect of the present invention, wherein the reinforcing girder and the reinforcing member abut on each other at an outer surface while abutting each other. The protruding part,
The reinforcing girder and the reinforcing member are formed integrally with each other, and the protruding portions are heated and melted in a state where they are in contact with each other, and the reinforcing member is welded to the reinforcing girder.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a bumper beam for an automobile according to the third aspect of the invention, wherein the groove of the welding is opened at an acute angle to a butt portion of the reinforcing girder and the reinforcing member. Are formed integrally with each of the reinforcing girder and the reinforcing member, and the reinforcing girder is irradiated with a laser beam along the abutting surface on the groove to apply the laser to the reinforcing girder. It is characterized by welding.

According to a sixth aspect of the present invention, there is provided a method of manufacturing a bumper beam for an automobile according to the third aspect, wherein the reinforcing beam and the reinforcing member are pushed over a butt surface at a butt portion of the reinforcing girder and the reinforcing member. Steps which form grooves extending in opposite directions are formed integrally with each of the reinforcing girder and the reinforcing member, and the reinforcing member is welded to the reinforcing girder while holding a filler material in the grooves. It is characterized by the following.

[0010]

According to the method for manufacturing a bumper beam for an automobile according to the first aspect of the present invention and the bumper beam for an automobile according to the second aspect of the present invention, the concave portion extending in the longitudinal direction of the reinforcing girder extruded to have a substantially U-shaped cross section. the opening, leaving a predetermined subcomplex of
Since the opening is formed between the correction members by closing with the number of reinforcing members, the production of the bumper beam having the opening is facilitated, and the material yield is improved by minimizing the material to be removed. That is, these
An opening surrounded by a reinforcing member and the pair of walls can be formed.
Therefore, an opening is formed without separately drilling holes in the extruded material
can do. This creates an opening in the extruded material
Compared to the conventional process where the extruded material is directly processed
It is much easier to open by attaching the correction member.
The mouth can be formed.

According to a third aspect of the present invention, there is provided a method of manufacturing a bumper beam for an automobile, wherein the reinforcing member is positioned while the reinforcing member is positioned by a protrusion provided on opposing wall surfaces forming a concave portion of the reinforcing girder. Welding to girder facilitates welding work.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a bumper beam for an automobile, wherein the protrusions provided at the butting portion of the reinforcing girder and the reinforcing member and projecting from the outer surface are brought into contact with each other, and the tip is heated. Then, the reinforcing girder and the reinforcing member are more easily and firmly welded.

In the method of manufacturing a bumper beam for an automobile according to a fifth aspect of the present invention, a laser beam is radiated along an abutting surface to a sharply-welded welding groove provided at a butting portion of a reinforcing girder and a reinforcing member. Therefore, the laser light is reflected by the inclined surface of the groove and is concentrated at the tip of the groove, and the butted portion is intensively heated and melted to be strongly welded.

In the method of manufacturing a bumper beam for an automobile according to the sixth aspect of the present invention, welding is performed while holding a filler material in a groove provided at a butt portion of a reinforcing girder and a reinforcing member. make it easier.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention;

Embodiment 1 FIG. 1 shows an embodiment of a bumper beam for an automobile according to claim 1 of the present invention and a manufacturing method thereof according to claim 2.
This will be described with reference to FIG. As shown in FIG. 1 as a perspective view, an automobile bumper beam 10 according to the first embodiment includes:
It has a reinforcing girder 11 and reinforcing members 12 and 13 for closing an opening of a concave portion 11b extending in the longitudinal direction. The reinforcing girder 1
1 is a pair of rectangular hollow cross sections 1 as shown in FIG.
The long side walls 11e and 11f on one side of 1a and 11c are opposed to each other, and the short side walls on one side are integrally connected by a flat wall 11d to have a substantially U-shaped cross section. And is extruded using an aluminum material. And, by the flat wall 11d and the walls 11e and 11f,
A recess 11b extending in the longitudinal direction is formed on the opposite side to the flat wall 11d. The reinforcing member 12
13 is an elongated strip extending in the extrusion direction, and both end faces in the width direction thereof are the walls 11e and 11f of the reinforcing girder 11.
So that it comes into contact with the wall surface. Further, bolt holes 12b and 13b for fixing components such as a direction support device are provided in the longitudinal end surfaces 12a and 13a.

Next, a method of manufacturing the bumper beam for an automobile according to the first embodiment will be described. First, the reinforcing girder 11 is extruded into a substantially U-shaped cross section. Next, reinforcing member 12
13 is formed in an elongated strip shape so that both end surfaces in the width direction thereof are in contact with the wall surfaces of the walls 11 e and 11 f of the reinforcing girder 11. Further, as shown in FIG. 2, first, both end faces in the width direction of the reinforcing member 12 are attached to the walls 11 e.
After positioning the surface of the reinforcing member 12 so as to be flush with the surface of the reinforcing girder 11, the two members are welded. Next, as shown in FIG.
An end face 13a on the side where the bolt insertion hole 13b is provided;
The reinforcing member 13 is welded to the reinforcing girder 11 in the same manner as the reinforcing member 12 so that the reinforcing member 12 is separated from the end surface 12a of the reinforcing member 12 on the side where the bolt insertion hole 12b is provided by the distance L, and the opening 14 is formed.
To form

As described above, the automobile bumper beam 11 in the first embodiment has a reinforcing girder extruded and formed into a substantially U-shaped cross section, and a concave portion which is welded to the reinforcing girder and extends in the pushing direction of the reinforcing girder. Since it is composed of a reinforcing member that closes a predetermined portion of the reinforcing girder, it can be easily manufactured as compared with a manufacturing method of providing an opening on a side surface of a reinforcing girder extruded into a closed cross-sectional shape as in the conventional example, so that expensive equipment is required. Not only is it unnecessary, but also the number of processing steps can be reduced and the productivity can be improved. Further, since the removed portion is only the bolt hole for mounting the component provided on the reinforcing member, the material yield can be improved and the cost can be reduced.
In the first embodiment, each of the reinforcing members 12 and 13 has a flat plate shape. However, the reinforcing members 12 and 13 need not be limited to this, and the strength of the bumper beam 10 is increased by forming the reinforcing members 12 and 13 into various shapes. It is good. Also,
In the first embodiment, the reinforcing member 12 is welded to the reinforcing girder 11. However, the present invention is not limited to this. For example, as shown in FIG.
The hook-shaped protrusions 11g and 12c that engage with each other at the butting portion of the reinforcement member 12 and the reinforcement member 12 may be integrally formed, and may be engaged with each other and bonded and fixed with the adhesive 15. As shown in an enlarged manner in FIG. 4, a protruding portion 11h is integrally formed on the surface of the walls 11e and 11f of the reinforcing girder 11 by extrusion.
After the reinforcing member 12 is superimposed and mounted thereon, the two members may be connected using a blind rivet 16. Further, the opening 14 for attaching a component such as a direction supporter may be formed in advance in the reinforcing member 12 itself and then welded to the reinforcing girder 11.

Embodiment 2 An embodiment of a method of manufacturing a bumper beam for an automobile according to claim 3 of the present invention will be described with reference to FIG. First, a description will be given of an automobile bumper beam 20 manufactured by the method of manufacturing an automobile bumper beam according to the second embodiment. As shown in a sectional view of FIG. And a reinforcing member 22 for closing the opening of the concave portion 21b extending in the direction. The reinforcing girder 21 is formed so as to have a substantially U-shaped cross section similarly to the reinforcing girder 11 of the first embodiment described above, but in the reinforcing girder 21 of the second embodiment, the wall 21e.
Projections 21g and 21h for positioning the reinforcing member 22 are vertically provided on 21f so as to face each other. And the position of these protrusion parts 21g and 21h is
The outer surface of the reinforcing member 22 is flush with the outer surface of the reinforcing girder 21 when the reinforcing member 22 is superposed. The reinforcing member 22 is, like the reinforcing member 11 of the first embodiment, an elongated strip extending in the extrusion direction, and both end faces in the width direction are formed on the wall 2 of the reinforcing girder 21.
The walls 1a and 21f are in contact with each other.

Next, a method of manufacturing the automotive bumper beam according to the second embodiment will be described. First, the reinforcing girder 21 is extruded into a substantially U-shaped cross section. At this time, the opposing walls 21e and 21f forming the recess 21b of the reinforcing beam 21
The reinforcing member 22 contacts the side surface 22a of the reinforcing member 22
The positioning protrusions 21g and 21h for positioning are extruded and formed integrally. Further, the reinforcing member 22 is formed in an elongated strip shape, and is formed so that both end surfaces in the width direction thereof are in contact with the wall surfaces of the walls 11 e and 11 f of the reinforcing girder 11. Next, one side surface 22 a of the reinforcing member 22 is
The reinforcing girder 21 is extruded by abutting and welding both end surfaces of the reinforcing member 22 to the wall surfaces of the walls 21e and 21f of the reinforcing girder 21 while abutting and positioning the positioning girder portions 21g and 21h. The opening of the recess 21b extending in the direction is closed except for a predetermined portion. That is, according to the method of manufacturing a bumper beam for an automobile of the second embodiment, the wall 2
1d · 21e wall surface and positioning protrusion 21
Since the reinforcing member 22 can be easily positioned on the reinforcing girder 21 by g · 21h, for example, automatic welding by a robot can be easily performed, and productivity can be further improved. On the other hand, the protrusions 21g and 21h
Can be integrally formed at the same time when the reinforcing girder 21 is extruded and formed, and therefore can be provided without increasing the number of processing steps.

Embodiment 3 An embodiment of a method of manufacturing an automobile bumper beam according to claim 4 of the present invention will be described with reference to FIG. First, a description will be given of an automobile bumper beam 30 manufactured by the method of manufacturing an automobile bumper beam according to the third embodiment. As shown in a sectional view of FIG. And a reinforcing member 32 for closing the opening of the concave portion 31b extending in the direction. Like the reinforcing girder 21 of the second embodiment, the reinforcing girder 31 is formed so as to have a substantially U-shaped cross section, and a protrusion 31g for positioning the reinforcing member 32.
31h is integrally formed with the walls 31e and 31f. The walls 31e and 31f are protruding portions 31i and 31j, respectively, extending toward the opening side of the concave portion 31b and protruding from the outer surface of the reinforcing girder 31. Then, from the tips of these protruding portions 31i and 31j, the protruding portions 31g and 31j are formed.
h, the wall surfaces of the walls 31e and 31f
Are formed as abutting surfaces 33 for abutting the end surfaces of the respective surfaces.
The reinforcing member 32 is formed by extruding flanges 32c and 32d at both ends in the width direction of an elongated strip extending in the longitudinal direction, and extruding the same integrally on one side surface 32b side, and extending the flanges 32c and 32d. Side 32 opposite to
"a" comes into contact with the protrusions 31g and 31h of the reinforcing girder 31, and both end faces in the width direction thereof are brought into contact with the butting surfaces 33, respectively.

Next, a method of manufacturing the bumper beam for a vehicle according to the third embodiment will be described. First, the reinforcing girder 31 is extruded into a substantially U-shaped cross section. At this time, the reinforcing member 32
The positioning projections 31g and 31h for positioning the slab and the walls 31e and 31f are respectively extended toward the opening side of the recess 31b, and the projections 31i and 31j projecting from the outer surface of the reinforcing girder 31 are integrally extruded and formed. Further, the reinforcing member 32 is an elongated strip extending in the longitudinal direction, and flanges 32c and 32d are integrally extruded and formed at both ends in the width direction so that both end faces in the width direction come into contact with the abutting surface 33. Molding. Next, the reinforcing member 32
Are positioned by the positioning protrusions 31g and 31h, and the protrusions 31i and 31j of the reinforcing girder 31 and the flanges 32c and 32d of the reinforcing member 32 abut against each other.
Abut each other. Then, in this state, the protrusions 31i and 31j of the reinforcing beam 31 and the flange 32c of the reinforcing member 32 are formed.
・ The reinforcing member 32 is formed by heating and melting the tip of 32d.
Is welded to the reinforcing girder 31.

That is, according to the method of manufacturing a bumper beam for an automobile of the third embodiment, the projecting portion 31i is formed on the reinforcing girder 31.
31j, and a flange 32c
Since d is provided so as to abut against each other at the butting surface 33, the positioning of the reinforcing member 32 with respect to the reinforcing girder 31 can be performed more easily. In addition, since the protruding portions 31i and 31j provided on the reinforcing girder 31 and the tips of the flanges 32c and 32d provided on the reinforcing member 32 protrude from the outer surface, heating can be easily performed. By melting and joining the base materials of the projecting portion and the flange, the reinforcing girder 31 and the reinforcing member 32 can be more firmly welded. Further, the protrusions 31i and 31j provided on the reinforcing girder 31 can be formed without increasing the number of processing steps, since they may be integrally formed at the same time when the reinforcing girder 31 is extruded.

Embodiment 4 An embodiment of a method of manufacturing a bumper beam for an automobile according to claim 5 of the present invention will be described with reference to FIGS. First, an automobile bumper beam 40 manufactured by the method for manufacturing an automobile bumper beam according to the fourth embodiment.
The bumper beam 40 will be described with reference to FIG.
As shown in the cross-sectional view of FIG. 1, there is provided a reinforcing girder 41 and a reinforcing member 42 for closing an opening of a concave portion 41b extending in the longitudinal direction. The reinforcing girder 41 is formed so as to have a substantially U-shaped cross section as in the above-described embodiment 2, and the protrusions 41g and 41h for positioning the reinforcing member 42 are integrally formed with the walls 41e and 41f. Have been. A pair of inclined surfaces 41 that open outward with respect to the opening are respectively provided at the ends of the walls 41e and 41f on the opening side of the recess 41b.
i.41j are formed. And the inclined surface 41i.
The wall surfaces of the walls 41e and 41f between the end of 41j and the protruding portions 41g and 41h are abutting surfaces 43 where the end surfaces of the reinforcing members 42 are abutted and welded, and the inclined surfaces 41i and 41j are It has an inclination angle of about 20 degrees with respect to the butting surface 43. The reinforcing member 42 is formed by extruding flanges 42c and 42d integrally at both ends in the width direction of an elongated strip extending in the longitudinal direction, and the tips of the flanges 42c and 42d are protruding portions 41g of the reinforcing girder 41. 41h, and both end surfaces in the width direction thereof are made to contact the abutting surfaces 43, respectively. An inclined surface 4 is provided at the base of the flanges 42c and 42d.
2e and 42f are formed, and the reinforcing member 42
1, the inclined surfaces 41 i and 41 j provided on the reinforcing girder 41 are symmetrical with respect to the butting surface 43, and the groove 4 for welding the butting surface 43 is provided.
4 are formed.

Next, a method of manufacturing the bumper beam for a vehicle according to the fourth embodiment will be described. First, the reinforcing girder 41 is extruded into a substantially U-shaped cross section. At this time, the reinforcing member 42
A pair of inclined surfaces 41i and 41j, which open outward with respect to the openings, are integrally formed on the positioning projections 41g and 41h and the walls 41e and 41f on the opening-side ends of the recesses 41b. I do. Further, the reinforcing member 42 is formed into an elongated strip extending in the longitudinal direction, and flanges 42c and 42d are integrally formed by extrusion at both ends in the width direction so that both end faces in the width direction come into contact with the abutting surface 43. Molding. Then, inclined surfaces 42e and 42f are integrally formed at the roots of the flanges 42c and 42d. Next, when the reinforcing member 42 is positioned by the positioning protrusions 41g and 41h and a predetermined portion of the opening of the concave portion 41b of the reinforcing girder 41 is closed, the inclined surfaces 41i and 41j provided on the reinforcing girder 41 and the reinforcing member The inclined surfaces 42 e and 42 f provided on the surface 42 oppose each other, and a groove having an opening angle of about 40 degrees is formed symmetrically with respect to the abutting surface 43. Therefore, the groove 43 is irradiated with laser light along the abutting surface 43, and the reinforcing beam 41 and the reinforcing member 42 are laser-welded. That is, according to the method of manufacturing a bumper beam for an automobile of the fourth embodiment, FIG.
As shown in the enlarged view, the laser beam is reflected by the inclined surface forming the groove 44 and is concentrated at the tip of the groove 44. Therefore, the butted portion of the reinforcing beam 41 and the reinforcing member 42 is concentrated. It is heated, and the reinforcing beam 41 and the reinforcing member 42 are efficiently heated, and the base material can be melted and strongly welded. In the fourth embodiment, the opening angle of the groove is set to about 40 degrees. However, the angle is not limited to this, and the range in which the laser light is reflected by the reflection surface forming the groove and concentrates on the tip of the groove. Among them, the opening angle of the groove may be appropriately selected. Further, the groove does not necessarily have to be symmetrical with respect to the abutting surface, and can be appropriately set in accordance with the angle at which the laser beam is irradiated.

Embodiment 5 An embodiment of a method of manufacturing a bumper beam for an automobile according to claim 6 of the present invention will be described with reference to FIG. First, a description will be given of an automobile bumper beam 50 manufactured by the method of manufacturing an automobile bumper beam according to the fifth embodiment. As shown in a sectional view of FIG. And a reinforcing member 52 for closing the opening of the concave portion 51b extending in the direction. The reinforcing girder 51 is formed so as to have a substantially U-shaped cross section similarly to the above-described second embodiment, and the protrusions 51g and 51h for positioning the reinforcing member 52 are formed on the wall 51.
e · 51f are integrally suspended. And the wall 5
Steps 51i and 51j are formed at the corners on the opening side of the concave portion 41b of 1e and 51f, respectively. The surface on the opening 51b side of the walls 51e and 51f between the step portions 51i and 51j and the projecting portions 51g and 51h is a butt surface 53 to which the end surfaces of the reinforcing member 52 are butted and welded. . The reinforcing member 52 is formed by integrally extruding stepped step portions 52a and 52b at both ends in the width direction of an elongated strip extending in the longitudinal direction, and the tip of the step-shaped portion protrudes. Part 51g / 5
1h, and both end surfaces in the width direction thereof are in contact with the butting surfaces 53 of the reinforcing beams 51, respectively.

Next, a method of manufacturing the bumper beam for a vehicle according to the fifth embodiment will be described. First, the reinforcing girder 51 is extruded into a substantially U-shaped cross section. At this time, the reinforcing member 52
Steps 51i and 51j are integrally extruded and formed at the positioning protrusions 51g and 51h for positioning the bosses and at the corners on the opening side of the walls 51e and 51f, respectively. Further, the reinforcing member 52 is an elongated strip extending in the longitudinal direction, and stepped portions 52a and 52b are integrally extruded at both ends in the width direction so that both end surfaces in the width direction abut on the abutting surface 53. Mold into Next, the reinforcing member 52
Are positioned by the positioning projections 51g and 51h, and a predetermined portion of the opening of the concave portion 51b of the reinforcing girder 51 is closed. As a result, the steps 51i and 51j and 52a and 52b provided on the reinforcing beam 51 and the reinforcing member 52 respectively face each other, and the longitudinal direction of the beam 50 of the fifth embodiment extends across the abutting surface 53. The reinforcing girder 51 and the reinforcing member 52 are welded to each other while holding a filler material inside the groove 54. That is, according to the method of manufacturing a bumper beam for an automobile of the fifth embodiment, since the groove extending in the extrusion direction across the butt surface is formed at the butt portion between the reinforcing girder and the reinforcing member. By performing the welding operation while holding the material, the welding operation can be performed more easily.

[0028]

According to the bumper beam for an automobile according to the first aspect of the present invention and the bumper beam for an automobile according to the second aspect of the present invention, the reinforcing girder is extruded into a substantially U-shaped cross section. A reinforcing member is joined to the reinforcing girder so as to close the opening of the concave portion extending in the extrusion direction of the reinforcing girder leaving a predetermined portion, and these reinforcing members and the wall of the reinforcing girder are joined together.
Since the enclosed opening was formed , the following excellent effects were obtained. That is, as compared with the manufacturing method in which an opening is provided on the side surface of a reinforcing girder extruded into a closed cross section as in the conventional example, a plurality of reinforcing members are joined.
And in so the opening can be easily manufactured can improve productivity by reducing the number of processing steps not only expensive equipment is not necessary, can be no waste of material, the reinforcing portion
The reinforcement girder can be reinforced with the material.

According to a third aspect of the present invention, there is provided a method of manufacturing a bumper beam for an automobile according to the second aspect of the present invention, wherein the reinforcing member is provided on the mutually facing wall surfaces forming the concave portions of the reinforcing girder. Since the positioning projections for positioning are integrally formed and the reinforcing member is abutted against the positioning projections and positioned and welded by abutting both end surfaces to the wall surface, the following excellent features are provided. The effect was obtained. That is, since the reinforcing member can be easily positioned on the reinforcing girder, for example, automatic welding by a robot can be easily performed, and the productivity can be further improved. On the other hand, since the positioning projections may be integrally formed at the same time as the extrusion of the reinforcing girder, they can be provided without increasing the number of processing steps.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a bumper beam for an automobile according to the third aspect of the present invention, wherein the abutting portion of the reinforcing girder and the reinforcing member protrudes from the outer surface while abutting each other. The projecting portion to be formed is integrally formed with each of the reinforcing girder and the reinforcing member, and the reinforcing member is welded to the reinforcing girder by heating and melting while the projecting portions are in contact with each other. Excellent effect was obtained. In other words, the positioning of the reinforcing member with respect to the reinforcing girder can be performed more easily, and the tips of the protruding portions provided on the reinforcing girder and the reinforcing member can be easily heated. By melting and joining, the reinforcing girder and the reinforcing member can be more firmly welded, and the strength of the automotive bumper beam can be improved.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a bumper beam for an automobile according to the third aspect of the present invention, wherein a sharpened welding groove is opposed to a butt portion of a reinforcing girder and a reinforcing member. The inclined surface to be formed is formed integrally with each of the reinforcing girder and the reinforcing member, and a laser beam is irradiated along the abutting surface toward the groove, and the reinforcing member is laser-welded to the reinforcing girder. Therefore, the following excellent effects were obtained. That is, when the laser light is irradiated along the abutting surface toward the groove, the laser light is reflected on the inclined surface of the groove and concentrated on the tip of the groove. As a result, the butting portion of the reinforcing girder and the reinforcing member is intensively heated, so that the reinforcing girder and the reinforcing member can be efficiently heated, and the base material is melted and the two are more strongly welded. it can.

According to a sixth aspect of the present invention, there is provided a method of manufacturing a bumper beam for an automobile according to the third aspect of the present invention, wherein the bumper beam extends in a pushing direction across a butt surface of a butt portion of the reinforcing girder and the reinforcing member. Steps forming grooves facing each other are integrally formed with the reinforcing girder and the reinforcing member, and the reinforcing member is welded to the reinforcing girder while holding the filler material in this groove, so that it can be easily formed. We can now perform welding work.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an automobile bumper beam according to claim 1 of the present invention.

FIG. 2 is a sectional view showing one embodiment of a bumper beam for an automobile according to claim 1 of the present invention.

FIG. 3 is an enlarged sectional view showing a main part of another embodiment of the automotive bumper beam according to claim 1 of the present invention.

FIG. 4 is an enlarged sectional view showing a main part of another embodiment of the automotive bumper beam according to claim 1 of the present invention.

FIG. 5 is a sectional view showing one embodiment of a bumper beam manufactured by the method for manufacturing a bumper beam for an automobile according to claim 3 of the present invention.

FIG. 6 is a sectional view showing one embodiment of a bumper beam manufactured by the method for manufacturing a bumper beam for an automobile according to claim 4 of the present invention.

FIG. 7 is a sectional view showing one embodiment of a bumper beam manufactured by the method for manufacturing a bumper beam for an automobile according to claim 5 of the present invention.

FIG. 8 is an enlarged explanatory view showing a main part of an embodiment of a bumper beam manufactured by the method for manufacturing a bumper beam for an automobile according to claim 5 of the present invention.

FIG. 9 is an explanatory view showing one embodiment of a bumper beam manufactured by the method for manufacturing an automobile bumper beam according to claim 6 of the present invention.

FIG. 10 is a perspective view showing a conventional bumper beam for an automobile.

FIG. 11 is a sectional view showing a conventional bumper beam for an automobile.

[Explanation of symbols]

 Reference Signs List 10 Bumper beam for vehicle of Example 1 11 Reinforcement girder of Example 1 12 Reinforcement member of Example 1 20 Bumper beam for vehicle of Example 2 21 Reinforcement girder of Example 2 22 Reinforcement member of Example 2 30 Example 3 Bumper beam for automobile 31 31 Reinforcement girder of Example 32 32 Reinforcement member of Example 40 40 Bumper beam for automobile of Example 4 41 Reinforcement girder of Example 4 42 Reinforcement member of Example 4 50 Bumper for automobile of Example 5 Beam 51 Reinforcement girder of Example 5 52 Reinforcement member of Example 5

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-128686 (JP, A) JP-A-61-113160 (JP, U) JP-A-1-174262 (JP, U) JP-A-63 98889 (JP, U) Japanese Utility Model Showa 60-184754 (JP, U) Japanese Utility Model Showa 62-83769 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60R 19/04 B60R 19 / 03

Claims (6)

(57) [Claims] 1. A pair of opposing walls and a pair of walls
A reinforcing girder which is extruded into substantially U-shaped cross-section with one side each other of the walls has a wall to be connected together, et al provided the counter
A pair of walls that are integrally connected to the other side of the pair of walls and partially block the opening of the recess extending in the extrusion direction of the reinforcing girder.
Ri Na and a reinforcing member number, among the plurality of reinforcing members
An opening surrounded by these reinforcing members and the pair of walls is formed.
An automobile bumper beam characterized by being formed . 2. A pair of opposing walls and a pair of these walls
A generally U-shaped section having a wall connecting one side of the wall together
Extrusion molding of the reinforcing girder of the surface, provided opposite the said
A plurality of reinforcing members integrally connected to the other side of the pair of walls and partially closing an opening of a concave portion extending in a pushing direction of the reinforcing girder are joined to the reinforcing girder, and
An opening surrounded by these reinforcing members and the pair of walls is provided between
Forming a bumper beam for an automobile. 3. A projection for positioning, which abuts on a side surface of the reinforcing member, is integrally formed on a wall surface of the reinforcing bar, which faces the concave portion, forming the concave portion. Both end faces are formed so as to abut against the wall surface, and the reinforcing member is abutted against the positioning protrusion while being positioned and welded by abutting both end surfaces to the wall surface of the reinforcing girder. The method for manufacturing a bumper beam for an automobile according to claim 2. 4. The reinforcing girder and the reinforcing member are formed integrally with each of the reinforcing girder and the reinforcing member, and a protruding portion that protrudes from an outer surface while being in contact with each other at the abutting portion of the reinforcing girder and the reinforcing member is formed. The method for manufacturing a bumper beam for an automobile according to claim 3, wherein the reinforcing member is welded to the reinforcing girder by heating and melting in a state where the bumper beams are in contact with each other. 5. An inclined surface for forming a welding groove that opens at an acute angle at an abutting portion of the reinforcing girder and the reinforcing member so as to face each other is integrally formed on each of the reinforcing girder and the reinforcing member, The method according to claim 3, wherein the reinforcing member is laser-welded to the reinforcing beam by irradiating the groove with a laser beam along the abutting surface. 6. A step formed in the abutting portion of the reinforcing girder and the reinforcing member so as to oppose each other with a groove extending in the extrusion direction across the abutting surface, integrally with the reinforcing girder and the reinforcing member, respectively. The method for manufacturing a bumper beam for an automobile according to claim 3, wherein the reinforcing member is formed and welded to the reinforcing girder while holding a filler material in the groove.