JPH06255433A - Bumper beam for automobile and its manufacture - Google Patents

Abstract

PURPOSE:To make the manufacture of a bumper beam for an automobile easy, and to improve the productivity. CONSTITUTION:A bumper beam 10 for an automobile has a reinforcement column 11 extrusion-molded in an about U-shape, and reinforcing members 12 and 13. The reinforcing members 12 and 13 are welded to the reinforcement column 11 to block the opening of a recess 11b extending longitudinal of the reinforcement column 11 placing an interval L, and form an opening 14 to install a part such as a direction holder. As a result, the bumper beam 10 can be manufactured easily compared with the conventional manufacturing way to form an opening at the side surface of a reinforcement column extrusion- molded in a closed section form, and thereby, the material yield is improved so as to reduce the cost, as well as the process number is reduced to improve the productivity.

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 bumper of an automobile.

[0002]

2. Description of the Related Art Generally, an automobile bumper is roughly composed of a bumper beam which is connected to a vehicle body and maintains the strength of the bumper, and a resin skin material which is attached to the bumper beam to adjust the appearance of the vehicle body. There is. The bumper beam has been made lighter in order to reduce fuel consumption, and in recent years, many examples are made of light alloy. For example, a bumper beam 1 shown in a perspective view in FIG. 10 and a 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 cross section in a V shape. An opening 3 for attaching components such as a direction indicator and introducing cooling air to the radiator, a bolt insertion hole 4 for attaching components, and the like are provided.

[0003]

However, the wall surface 2 of the reinforcing girder 2 extruded in such a closed cross-sectional shape as described above.
In the conventional method for manufacturing the automobile bumper beam 1 in which the opening 3 is provided in a, the process of providing the opening 3 is not easy, the processing equipment is complicated, the equipment cost is high, and the number of processing steps is large, resulting in high productivity. Could not be improved. In addition, since the material removal process is performed, the material yield is low, and there is a problem in that the cost is increased when the reinforcing girder for the bumper is manufactured from an expensive light alloy material. Therefore, the present invention has been made in view of the above-mentioned current situation, and makes it possible to easily manufacture a bumper beam for automobiles, thereby reducing the equipment cost and the number of processing steps. It is an object of the present invention to improve productivity and material yield to improve the manufacturing cost of bumper beams.

[0004]

In order to solve the above-mentioned problems, a vehicle bumper beam according to claim 1 of the present invention comprises a reinforcing girder extruded into a substantially U-shaped cross section, and a reinforcing girder of the reinforcing girder. It is characterized by comprising a reinforcing member joined to the reinforcing girder so as to close the opening of the recess extending in the pushing direction while leaving a predetermined portion.

According to a second aspect of the present invention which solves the above-mentioned problems, a method for manufacturing a bumper beam for an automobile according to the present invention comprises extruding a reinforcing girder into a substantially U-shaped cross section, and extending in the extruding direction of the reinforcing girder. A reinforcing member is joined to the reinforcing girder so as to close the opening of the recess leaving a predetermined portion.

A method for manufacturing an automobile bumper beam according to a third aspect of the present invention is the same as the second method according to the second aspect, wherein the reinforcing members are provided on wall surfaces of the reinforcing girder that face each other and that form the recesses. A protrusion for positioning which abuts against the side surface of the member and is integrally molded, and the reinforcing member is molded so that both end faces in the width direction thereof are butted against the wall surface, and the reinforcing member is positioned by the protrusion for positioning. It is characterized in that both end faces are abutted against the wall surface and welded while being brought into contact with and positioned.

According to a fourth aspect of the present invention, there is provided a method for manufacturing a bumper beam for an automobile according to the third aspect, wherein the outer surface of the reinforcing girder and the reinforcing member are abutted against each other while contacting each other. The protruding part that protrudes,
It is characterized in that the reinforcing girder and the reinforcing member are formed integrally with each other, and the protruding members are heated and melted in a state of being in contact with each other to weld the reinforcing member to the reinforcing girder.

According to a fifth aspect of the present invention, there is provided an automobile bumper beam manufacturing method, which is different from the third aspect of the manufacturing method described above in that the welding groove is opened at an acute angle at the abutting portion of the reinforcing girder and the reinforcing member. Slanting surfaces that are formed to face each other are formed integrally with each of the reinforcing girder and the reinforcing member, and the reinforcing girder is laser-irradiated by irradiating the groove with laser light along the abutting surface. Characterized by welding.

According to a sixth aspect of the present invention, there is provided a method for manufacturing a bumper beam for an automobile according to the third aspect, wherein the bumper beam is extruded to the abutting portion of the reinforcing girder and the reinforcing member across the abutting surface. Stepped portions that form groove portions extending in the direction facing each other 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 groove portions. It is characterized by

[0010]

According to the present invention, the bumper beam for an automobile and the method for manufacturing a bumper beam for an automobile according to claim 2 are provided with a recess extending in the longitudinal direction of a reinforcing girder extruded into a substantially U-shaped cross section. Since the opening is closed by the reinforcing member leaving a predetermined portion, the manufacturing is facilitated, and the material removed is minimized to improve the material yield.

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 reinforced while the reinforcing member is positioned by the protrusions provided on the wall surfaces facing each other forming the concave portion of the reinforcing girder. Since it is welded to the girder, welding work is facilitated.

According to a fourth aspect of the present invention, in the method for manufacturing a bumper beam for automobiles, the protrusions provided at the abutting portions of the reinforcing girder and the reinforcing member and protruding from the outer surface are brought into contact with each other, and the tips thereof are heated. Since they are melted and welded to each other, the reinforcing girder and the reinforcing member are welded more easily and firmly.

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 a butt surface of a groove of a welding which is provided at a butt portion of the reinforcing girder and the reinforcing member and opens at an acute angle. Therefore, the laser light is reflected by the inclined surface of the groove and concentrated at the tip of the groove, and the butt portion is intensively heated and melted to firmly weld.

In the method of manufacturing a bumper beam for an automobile according to claim 6 of the present invention, since welding is performed while holding the filler material in the groove portions provided in the abutting portions of the reinforcing girder and the reinforcing member, the welding operation is performed. make it easier.

[0015]

Embodiments of the present invention will be described in detail below with reference to the drawings.

Embodiment 1 An embodiment of the automobile bumper beam according to claim 1 of the present invention and the manufacturing method thereof according to claim 2 is shown in FIG.
And it demonstrates using FIG. The bumper beam 10 for an automobile according to the first embodiment has a perspective view as shown in FIG.
The reinforcing girder 11 and the reinforcing members 12 and 13 for closing the opening of the recess 11b extending in the longitudinal direction thereof are provided. The reinforcing girder 1
1 is a pair of rectangular hollow cross-section parts 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 plate-shaped wall 11d to have a substantially U-shaped cross section. However, it is extruded using an aluminum material. And by the flat plate-shaped wall 11d and the walls 11e and 11f,
A recess 11b extending in the longitudinal direction is formed on the side opposite to the flat wall 11d. The reinforcing member 12
13 is an elongated strip plate extending in the extruding direction, and both end faces in the width direction thereof are the walls 11e and 11f of the reinforcing girder 11.
It is designed to abut the wall surface of the. Further, bolt holes 12b and 13b for fixing parts such as a direction supporter are provided in the longitudinal end faces 12a and 13a.

Next, a method of manufacturing the automobile bumper beam of the first embodiment will be described. First, the reinforcing girder 11 is extruded into a substantially U-shaped cross section. Then the reinforcement member 12
The strip 13 is formed into an elongated strip shape so that both end surfaces in the width direction of the strip 13 are in contact with the wall surfaces of the walls 11e and 11f of the reinforcing girder 11. Further, as shown in FIG. 2, first, the widthwise end faces of the reinforcing member 12 are connected to the walls 11e.
After abutting against the surface of 1f and positioning so that the surface of the reinforcing member 12 is flush with the surface of the reinforcing girder 11, the both are welded. Next, as shown in FIG. 1, the reinforcing member 13
End surface 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 end surface 12a of the reinforcing member 12 on the side where the bolt insertion hole 12b is provided is separated by the distance L, and the opening 14 is formed.
To form.

As described above, the automobile bumper beam 11 according to the first embodiment has a reinforcing girder extruded in a substantially U-shaped cross section and a concave portion welded to the reinforcing girder and extending in the extruding direction of the reinforcing girder. Since it is composed of a reinforcing member for closing a predetermined portion of the above, compared with a manufacturing method in which an opening is provided on the side surface of a reinforcing girder extruded in a closed cross-sectional shape as in the conventional example, it can be easily manufactured, and therefore expensive equipment is required. Not only is it unnecessary, but the number of processing steps can be reduced and productivity can be improved. Further, since the removed portion is only the bolt hole for mounting the component provided in the reinforcing member, the material yield can be improved and the cost can be reduced.
In the first embodiment, the reinforcing members 12 and 13 are both flat plates, but the reinforcing members 12 and 13 are not limited to these, and the strength of the bumper beam 10 can be increased by forming the reinforcing members 12 and 13 into various shapes. Good as a matter. Also,
In the first embodiment, the reinforcing member 12 is welded to the reinforcing girder 11, but there is no need to be caught by this. For example, as shown in an enlarged view of a main part of FIG.
The hook-shaped protrusions 11g and 12c that engage with each other at the abutting portion of 1 and the reinforcing member 12 may be integrally formed, respectively, and both may be engaged with each other and adhesively fixed with the adhesive 15. As shown in an enlarged view of a main part in FIG. 4, a protrusion 11h is integrally extruded on the surfaces of the walls 11e and 11f of the reinforcing girder 11.
It is also possible to place the reinforcing member 12 on top of each other and then join the both by using the blind rivet 16. Further, the opening 14 for mounting a component such as a directional support may be preformed on the reinforcing member 12 itself and then welded to the reinforcing girder 11.

Embodiment 2 An embodiment of a method for manufacturing an automobile bumper beam according to claim 3 of the present invention will be described with reference to FIG. First, the automobile bumper beam 20 manufactured by the method for manufacturing an automobile bumper beam according to the second embodiment will be described. The bumper beam 20 has a reinforcing girder 21 and a longitudinal length thereof as shown in a sectional view of FIG. The reinforcing member 22 closes the opening of the recess 21b extending in the direction. The reinforcing girder 21 is molded so as to have a substantially U-shaped cross section like the reinforcing girder 11 of the first embodiment, but in the reinforcing girder 21 of the second embodiment, the wall 21e.
Projection parts 21g and 21h for positioning the reinforcing member 22 are vertically provided on 21f so as to face each other. And the positions of these protruding portions 21g and 21h are
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. Similar to the reinforcing member 11 of the first embodiment, the reinforcing member 22 is an elongated strip plate extending in the extruding direction, and both end faces in the width direction thereof have the wall 2 of the reinforcing girder 21.
The wall surfaces of 1e and 21f are in contact with each other.

Next, a method of manufacturing the automobile bumper beam of 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 girder 21 are opposed to each other.
To the side surface 22a of the reinforcing member 22 and
The protrusions 21g and 21h for positioning for positioning are integrally extruded and molded. Further, the reinforcing member 22 is formed into an elongated strip plate shape, and its both widthwise end faces are formed so as to contact the wall surfaces of the walls 11e and 11f of the reinforcing girder 11. Next, the side surface 22 a on one side of the reinforcing member 22 is attached to the reinforcing girder 21.
While extruding the reinforcing girder 21 by abutting the positioning projections 21g and 21h provided on the base plate and positioning, both end faces of the reinforcing member 22 are butted against the wall surfaces of the walls 21e and 21f of the reinforcing girder 21. The opening of the recess 21b extending in the direction is closed except for a predetermined portion. That is, according to the method for manufacturing the automobile bumper beam of the second embodiment, the wall 2
Walls 1d and 21e and the protrusion 21 for positioning
With g · 21h, the reinforcing member 22 can be easily positioned on the reinforcing girder 21, so that automatic welding by a robot, for example, 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 reinforcement girder 21 is extrusion-molded, and therefore can be provided without increasing the number of processing steps.

Embodiment 3 An embodiment of a method for manufacturing an automobile bumper beam according to claim 4 of the present invention will be described with reference to FIG. First, an automobile bumper beam 30 manufactured by the method for manufacturing an automobile bumper beam of the third embodiment will be described. The bumper beam 30 has a reinforcing girder 31 and a longitudinal direction thereof as shown in a sectional view in FIG. The reinforcing member 32 closes the opening of the recess 31b extending in the direction. Similar to the reinforcing girder 21 of the second embodiment, the reinforcing girder 31 is molded so as to have a substantially U-shaped cross section, and the protruding portion 31g for positioning the reinforcing member 32.
31h is formed integrally with the walls 31e and 31f. The walls 31e and 31f are projecting portions 31i and 31j that extend toward the opening side of the recess 31b and project from the outer surface of the reinforcing girder 31. Then, from the tips of the protrusions 31i and 31j, the protrusions 31g and 31j
The wall surface of the walls 31e and 31f reaching h is the reinforcing member 32.
Is the abutting surface 33 for abutting the end faces of.
The reinforcing member 32 is formed by extruding flanges 32c and 32d at both ends in the width direction of an elongated strip that extends in the longitudinal direction integrally on one side surface 32b side, and the side on which the flanges 32c and 32d extend. Side face 32 opposite to
The a is abutted on the protrusions 31g and 31h of the reinforcing girder 31, and both end faces in the width direction thereof are abutted on the abutting faces 33, respectively.

Next, a method of manufacturing the automobile bumper beam of 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 projections 31g and 31h for positioning, and the projections 31i and 31j that extend from the outer surface of the reinforcing girder 31 by extending the walls 31e and 31f to the opening side of the recess 31b are integrally extruded. Further, the reinforcing member 32 is formed as an elongated strip plate extending in the longitudinal direction, and flanges 32c and 32d are integrally extruded and molded at both end portions in the width direction thereof so that both end surfaces in the width direction contact the abutting surface 33. Mold. Then, the reinforcing member 32
Is 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 are brought into contact with each other.
Abut each other. Then, in this state, the projecting portions 31i and 31j of the reinforcing girder 31 and the flange 32c of the reinforcing member 32.
.Reinforcing member 32 by heating and melting the tip of 32d
Are welded to the reinforcing girder 31.

That is, according to the method for manufacturing the automobile bumper beam of the third embodiment, the reinforcing girder 31 has the protrusion 31i.
31j, and flanges 32c and 32 on the reinforcing member 32
Since d is provided so as to be brought into contact with 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. Further, since the tips of the protrusions 31i and 31j provided on the reinforcing girder 31 and the flanges 32c and 32d provided on the reinforcing member 32 are made to protrude from the outer surface, they can be easily heated and at the same time. The reinforcement girder 31 and the reinforcement member 32 can be welded more firmly by melting and joining the base materials of the protrusion and the flange. Furthermore, since the protrusions 31i and 31j provided on the reinforcing girder 31 may be integrally formed at the same time when the reinforcing girder 31 is extrusion-molded, the protruding parts 31i and 31j can be formed without increasing the number of processing steps.

Embodiment 4 An embodiment of a method for manufacturing an automobile bumper beam according to claim 5 of the present invention will be described with reference to FIGS. 7 and 8. First, an automobile bumper beam 40 manufactured by the method for manufacturing an automobile bumper beam of the fourth embodiment.
The bumper beam 40 shown in FIG.
As shown as a sectional view, it has a reinforcing girder 41 and a reinforcing member 42 that closes the opening of the recess 41b extending in the longitudinal direction thereof. The reinforcing girder 41 is formed to have a substantially U-shaped cross section as in the second embodiment, and the protrusions 41g and 41h for positioning the reinforcing member 42 are formed integrally with the walls 41e and 41f. Has been done. A pair of inclined surfaces 41 that open outward with respect to the opening is provided at the opening-side ends of the recesses 41b of the walls 41e and 41f.
i * 41j is formed. And the inclined surface 41i
The wall surfaces of the walls 41e and 41f between the end portion of 41j and the projecting portions 41g and 41h are butt surfaces 43 to which the end surfaces of the reinforcing member 42 are butted and welded, and the inclined surfaces 41i and 41j are It has an inclination angle of about 20 degrees with respect to the abutting surface 43. The reinforcing member 42 is formed by extruding flanges 42c and 42d integrally on both ends in the width direction of a long strip extending in the longitudinal direction, and the tips of the flanges 42c and 42d are projected portions 41g of the reinforcing girder 41. 41h is made to abut, and both end faces in the width direction thereof are made to abut on the abutting face 43, respectively. Then, the inclined surface 4 is formed at the base of the flanges 42c and 42d.
2e and 42f are formed, and the reinforcing member 42 is used as the reinforcing girder 4.
1 is attached to the reinforcing girder 41 so as to be symmetrical with respect to the inclined surfaces 41i and 41j and the abutting surface 43, and the groove 4 at the time of welding the abutting surface 43
4 are formed.

Next, a method of manufacturing the automobile bumper beam of the fourth embodiment will be described. First, the reinforcing girder 41 is extrusion-molded 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 opening, are integrally extruded at the positioning protrusions 41g and 41h for positioning and the ends of the walls 41e and 41f on the opening side of the recess 41b. To do. Further, the reinforcing member 42 is an elongated strip plate extending in the longitudinal direction, and the flanges 42c and 42d are integrally extruded and molded at both end portions in the width direction thereof so that both end surfaces in the width direction abut the abutting surface 43. Mold. Then, the 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 to close a predetermined portion of the opening of the recess 41b of the reinforcing girder 41, the inclined surfaces 41i and 41j provided on the reinforcing girder 41 and the reinforcing member. The inclined surfaces 42e and 42f provided on 42 oppose each other to form a groove that is symmetrical with respect to the abutting surface 43 and has an opening angle of about 40 degrees. Therefore, the groove 43 is irradiated with laser light along the abutting surface 43, and the reinforcing girder 41 and the reinforcing member 42 are laser-welded. That is, according to the method for manufacturing the automobile bumper beam of the fourth embodiment, as shown in FIG.
As enlarged and shown, the laser light is reflected by the inclined surface forming the groove 44 and concentrated on the tip of the groove 44, so that the portion where the reinforcing girder 41 and the reinforcing member 42 are abutted is concentrated. When heated, the reinforcing girder 41 and the reinforcing member 42 can be efficiently heated and the base material can be melted and firmly welded. In addition, in the fourth embodiment, the opening angle of the groove is set to about 40 degrees, but it is not necessary to be restricted to this, and the range in which the laser light is reflected by the reflecting surface forming the groove and is concentrated on the tip of the groove. The opening angle of the groove may be selected as appropriate. Further, the groove does not necessarily have to be symmetric with respect to the abutting surface, and can be set appropriately according to the angle of laser light irradiation.

Embodiment 5 An embodiment of a method for manufacturing an automobile bumper beam according to claim 6 of the present invention will be described with reference to FIG. First, an automobile bumper beam 50 manufactured by the method for manufacturing an automobile bumper beam according to the fifth embodiment will be described. The bumper beam 50 includes a reinforcing girder 51 and a longitudinal length thereof as shown in a sectional view in FIG. The reinforcing member 52 closes the opening of the recess 51b extending in the direction. The reinforcing girder 51 is formed to have a substantially U-shaped cross section as in the second embodiment, and the projections 51g and 51h for positioning the reinforcing member 52 have walls 51.
It is installed vertically on the e51f. And the wall 5
Steps 51i and 51j are formed at the corners of the openings 1e and 51f on the opening side of the recess 41b. The surfaces of the walls 51e and 51f between the stepped portions 51i and 51j and the protrusions 51g and 51h on the side of the opening 51b are the abutting surfaces 53 to which the end faces of the reinforcing members 52 are abutted and welded. . The reinforcing member 52 is formed by integrally extruding stepwise step portions 52a and 52b at both ends in the width direction of an elongated strip plate extending in the longitudinal direction, and the tip of the stepwise formed portion is the protrusion. Part 51g / 5
The widthwise end surfaces of the reinforcing girder 51 abut on the abutting surface 53 of the reinforcing girder 51.

Next, a method of manufacturing the automobile bumper beam of 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 at the positioning protrusions 51g and 51h and the corners on the opening side of the walls 51e and 51f, respectively. Further, the reinforcing member 52 is formed as an elongated strip plate extending in the longitudinal direction, and step portions 52a and 52b are integrally extruded and molded at both ends in the width direction so that both end surfaces in the width direction abut the abutting surface 53. To mold. Then, the reinforcing member 52
Is positioned by the positioning protrusions 51g and 51h to close a predetermined portion of the opening of the recess 51b of the reinforcing girder 51. As a result, the step portions 51i and 51j and 52a and 52b provided on the reinforcing girder 51 and the reinforcing member 52 respectively face each other, and the longitudinal direction across the abutting surface 53 on the surface of the beam 50 of the fifth embodiment. Since the groove 54 extending in the direction is formed, the reinforcing girder 51 and the reinforcing member 52 are welded to each other while holding the filler material inside the groove 54. That is, according to the method for manufacturing an automobile bumper beam of the fifth embodiment, a groove extending in the extrusion direction across the abutting surface is formed at the abutting portion between the reinforcing girder and the reinforcing member. By performing the welding work while holding the material, the welding work can be performed more easily.

[0028]

In the automobile bumper beam according to claim 1 of the present invention and the automobile bumper beam manufacturing method according to claim 2, a reinforcing girder is extruded into a substantially U-shaped cross section, Since the reinforcing member is joined to the reinforcing girder so as to close the opening of the recess extending in the extrusion direction of the reinforcing girder leaving a predetermined portion, the following excellent effects are obtained. That is, as compared with a manufacturing method in which an opening is provided on the side surface of a reinforcing girder extruded into a closed cross-sectional shape as in the conventional example, it is possible to easily manufacture, so not only expensive equipment is not required, but also the number of processing steps is reduced. Productivity can be improved. Further, since the removed portion is only the bolt hole for mounting the component, the material yield can be improved and the cost can be reduced.

The method of manufacturing a bumper beam for an automobile according to claim 3 of the present invention is the same as the manufacturing method according to claim 2, in which reinforcing members are provided on the mutually opposing wall surfaces forming the recesses of the reinforcing girder. Since the positioning protrusion for positioning is integrally formed and the reinforcing member is brought into contact with the positioning protrusion for positioning and both end faces thereof are butted against the wall surface and welded, the following excellent features are obtained. The effect was obtained. That is, since the reinforcing member can be easily positioned on the reinforcing girder, automatic welding by, for example, a robot can be easily performed, and productivity can be further improved. On the other hand, the positioning protrusion may be integrally formed at the same time when the reinforcing girder is extrusion-molded, so that it can be provided without increasing the number of processing steps.

According to a fourth aspect of the present invention, there is provided an automobile bumper beam manufacturing method according to the third aspect, wherein the reinforcing girder and the reinforcing member are abutted with each other and abutted against each other at the outer surface thereof. Since the projecting portion to be formed is integrally formed on each of the reinforcing girder and the reinforcing member, and the projecting portions are heated and melted in a state of being in contact with each other, the reinforcing member is welded to the reinforcing girder. Excellent effect was obtained. That is, the reinforcement member can be more easily positioned with respect to the reinforcement girder, the tips of the protrusions provided on the reinforcement girder and the reinforcement member can be easily heated, and the base material of these protrusions can be further improved. By melting and joining, the reinforcing girder and the reinforcing member can be welded more firmly, and the strength of the automobile bumper beam can be improved.

According to a fifth aspect of the present invention, there is provided a method for manufacturing a bumper beam for an automobile according to the third aspect of the present invention, in which the sharpened welding grooves are opposed to each other at the abutting portions of the reinforcing girder and the reinforcing member. Then, the inclined surface to be formed is formed integrally with each of the reinforcing girder and the reinforcing member, and laser light 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 laser light is irradiated toward the groove along the abutting surface, the laser light is reflected by the inclined surface of the groove and is concentrated on the tip of the groove. As a result, the abutting 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 can be melted to weld them more firmly. it can.

According to a sixth aspect of the present invention, there is provided a method for manufacturing an automobile bumper beam according to the third aspect, wherein the reinforcing beam and the reinforcing member extend in the extruding direction across the abutting surfaces at the abutting portions. Since the stepped portions that form the groove portions 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 the groove portions, it is easy to It became possible to perform welding work.

[Brief description of 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 cross-sectional view showing an embodiment of a vehicle bumper beam according to claim 1 of the present invention.

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

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

FIG. 5 is a cross-sectional view showing an 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 cross-sectional view showing an example of a bumper beam manufactured by the method for manufacturing an automobile bumper beam according to claim 4 of the present invention.

FIG. 7 is a cross-sectional view showing 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. 8 is an explanatory diagram showing an enlarged 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 an example of a bumper beam manufactured by the method for manufacturing a bumper beam for an automobile 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 cross-sectional view showing a conventional bumper beam for an automobile.

[Explanation of symbols]

 10 Automotive Bumper Beam of Example 1 11 Reinforcing Girder of Example 1 12 Reinforcing Member of Example 1 20 Bumper Beam for Automotive of Example 2 21 Reinforcing Girder of Example 2 22 Reinforcing Member of Example 2 30 Example 3 Automotive bumper beam 31 Reinforcing girder of Example 3 32 Reinforcing member of Example 40 40 Bumper beam for vehicle of Example 4 41 Reinforcing girder of Example 4 Reinforcing member 50 of Example 4 Automotive bumper of Example 5 Beam 51 Reinforcing girder of Example 5 52 Reinforcing member of Example 5

Claims (6)

[Claims] 1. A reinforcing girder extruded in a substantially U-shaped cross section, and a reinforcing member joined to the reinforcing girder so as to close an opening of a recess extending in the extruding direction of the reinforcing girder leaving a predetermined portion. A bumper beam for an automobile, comprising: 2. The reinforcing girder is extruded into a substantially U-shaped cross section, and a reinforcing member is joined to the reinforcing girder so as to close the opening of the recess extending in the extrusion direction of the reinforcing girder leaving a predetermined portion. And a method for manufacturing an automobile bumper beam. 3. A positioning protrusion for abutting and positioning a side surface of the reinforcing member is integrally extruded on wall surfaces of the reinforcing girder that face each other and that form the recess, and the reinforcing member is formed in the width direction thereof. Both end surfaces are formed so as to abut against the wall surface, and both end surfaces are abutted against the wall surface of the reinforcing girder while welding while positioning the reinforcing member in contact with the positioning protruding portion. The method for manufacturing an automobile bumper beam according to claim 2. 4. A protrusion protruding from the outer surface while abutting each other at the abutting portions of the reinforcing girder and the reinforcing member is integrally molded with each of the reinforcing girder and the reinforcing member, and these protruding portions are mutually 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 of being brought into contact with each other. 5. An inclined surface that forms welding grooves that open at an acute angle at the abutting portions of the reinforcing girder and the reinforcing member so as to face each other is formed integrally with each of the reinforcing girder and the reinforcing member, The method for manufacturing a bumper beam for an automobile according to claim 3, wherein the groove is irradiated with a laser beam along a butting surface to laser-weld the reinforcing member to the reinforcing girder. 6. A step portion, which is formed at the abutting portion of the reinforcing girder and the reinforcing member so as to face each other and extends in the extrusion direction across the abutting surface, is integrally formed with each of the reinforcing girder and the reinforcing member. 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 the filler material in the groove.