JPH0725296A - Automobile bumper extruded material and end forming method therefor - Google Patents

Abstract

PURPOSE:To provide an extruded material and its end forming method, capable of preventing any crinkles from occurring on a setting surface to a supporting member for a body front and the like. CONSTITUTION:This is an extruded forming material 1 for a columnar automobile bumper forming a sectional profile into a rectangle with two webs 3 and 2 being installed in the front or the like of an automobile and parallel with a car body and two flanges 4 and 5 vertical with these webs 3 and 2. In both ends 1a of this extruded material 1, both these two flanges 4, 5 are buckled inwards the extruded material 1, and only the web 3 at the outside of the car body is curved to the car body side so as to match with a form of the car body, and the web 2 at the car body side is not buckled at all.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bumper which is attached to the front and rear of an automobile or the like and absorbs the kinetic energy of the vehicle body at the time of a collision, and more particularly to a columnar extruded shape member which is inserted into the bumper to reinforce the bumper. Regarding the ends of.

[0002]

2. Description of the Related Art As shown in FIG. 8, a bumper 50 is supported by a stay 51 or the like and attached to the front or the like of an automobile to absorb kinetic energy in the event of a collision. If both ends of such a bumper 50 are left protruding sideways,
Since it is dangerous for people to get caught in the vehicle and it hinders traffic, it is bent toward the vehicle body in conformity with the shape of the vehicle body. or,
The stay 51 is a protruding portion 5 on both sides of the bumper 50.
In order to reduce 0a as much as possible, it is provided at the end in the vehicle body width direction as much as possible. This is because if the laterally protruding portion 50a of the bumper 50 is large, when the vehicle body collides with the wall surface or another vehicle body obliquely, a crack occurs from the attachment portion of the stay 51, and the deformation at the time of collision becomes large, This is because the vehicle body will be greatly damaged.

By the way, in such a bumper 50,
In order to reinforce the bumper, as shown in FIG. 9, a columnar extruded shape in which two webs 53, 54 parallel to the vehicle body and two flanges 55, 56 perpendicular to the web form a rectangular cross-sectional profile. A material 52 is inserted, and both ends 52a of the material 52 are
Both webs 53 and 54 on the vehicle body side and the vehicle body outer side are bent to the vehicle body side according to the shape of the bumper. Incidentally, FIG.
In (a), the flange 5 perpendicular to the webs 53, 52
5 is shown on the other side of the paper surface and in front of the paper surface of the flange 56, and FIG. 9B is a sectional view taken along line AA of FIG. 9A.
In addition, a web or a flange as a reinforcing rib 57 may be provided in the columnar extruded shape member 52 as needed, and the cross section thereof has a day, eye or square shape as shown in FIGS. 10 to 12. Is generally done.

The stay 51, which is a support member for the front of the vehicle body of the bumper 50, is bent as close to the end of the extruded shape member 52 as possible, that is, toward the vehicle body in order to minimize the laterally protruding portion. The extruded profile 52 is attached to the R portions 52b at both ends 52a. This is because when the stay 51 is provided at the end rather than the R portion 52b, the end 52a of the extruded profile 52 is bent toward the vehicle body,
This is because the distance between the vehicle body and the bumper 50 increases, which is not preferable.

An apparatus for molding both ends of such a conventional extruded profile 52 and a molding method thereof will be described with reference to FIG. In FIG. 13, reference numeral 58 is a bending table, 59 is a vertical load roller, and 60 is a core. Corner 58a of bending table 58
Is the R portion 52 of the end portion 52a of the extruded profile 52 to be curved.
The radius of curvature is determined according to the desired radius of curvature of b. The vertical load roller 59 is provided at the end 5 of the extruded profile 52.
A downward vertical load is applied to 2a to bend the corner 58 of the bending table 58.
It is a roller for bending along a. Core 60
The vertical load of the roller 59 is the end 5 of the extruded profile 52.
It is a guide for curving along the corner 58a of the bending table 58 so that the end portion 52a is not crushed when it is applied to 2a, and moves in synchronization with the roller 59.

A method of molding both ends of the conventional extruded profile 52 to be molded by the above apparatus will be described. Extruded profile 52,
The web 54 on the outer side of the vehicle body is directed upward, the web 53 on the vehicle body side is placed toward the bending table 58, and the core 60 is inserted into both end portions 52a of the extruded profile 52. Then, the vertical load roller 59 is pressed against the end 52a of the extruded profile 52 to move in the direction of arrow 61. At this time, the core 60 is also moved in the direction of arrow 62 in accordance with the movement of the roller 59. Then, both ends 52a of the extruded shape member 52 are bent to the bending table 58.
Curved along the corner 58a of the
b has a desired radius of curvature. In this way, both ends of the extruded shape member 52 are formed so that the extruded shape member 52 conforms to the shape of the vehicle body.
To get

[0007]

However, according to the conventional method for forming both ends of the extruded profile 52, as shown in FIG.
The stay 5 as a supporting member for supporting the extruded profile 52 shown in FIG.
There is a problem that wrinkles are easily formed on the R portion 52b, which is a mounting surface for the first member, etc., and it is difficult to mount the extruded profile member 52 on a supporting member such as the stay 51 due to the wrinkles.
Although wrinkles can be reduced to some extent by adjusting the core 60 appropriately, a precise design of the core 60 is required according to the extruded profile 52, and the vertical load roller 59 is required.
It is also difficult to fine-tune the synchronization with. Further, even if such a precise design and adjustment are performed, it is not possible to completely prevent the generation of wrinkles.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an extruded shape member in which wrinkles do not occur on a mounting surface to a supporting member such as a front of a vehicle body and an end forming method thereof. Is provided.

[0009]

In order to achieve the above object, an extruded profile of a bumper for an automobile according to the present invention is provided with two or more webs provided in the front of the automobile or the like and parallel to the vehicle body, and perpendicular to the webs. An extruded profile of a pillar-shaped automobile bumper having two or more flanges and having a rectangular cross-sectional profile, wherein the two outer flanges are the extruded profiles at both ends of the extruded profile. The material is buckled inward of the material and only the web on the vehicle exterior side is curved toward the vehicle body so as to match the shape of the vehicle body, and the web on the vehicle body side is not buckled.

Further, the method of forming the end portion of the extruded profile of the bumper for an automobile of the present invention has two or more webs parallel to the vehicle body and two or more flanges perpendicular to the web to form a profile of a cross section. A columnar automobile bumper extrusion formed in a rectangular shape is supported horizontally from the web side that is the vehicle body side, with the web that is the outer side of the vehicle body facing upward. In addition to applying a load to the inner side of the extruded profile to the two flanges of, and applying a load to the web that is the outer side of the vehicle body, the two flanges to the inner side of the extruded profile. The web is buckled, and the web on the outer side of the vehicle body is formed on the vehicle body side so as to match the shape of the vehicle body.

[0011]

[Function] The two outer flanges buckle inward of the extruded shape and only the web on the outer side of the vehicle body curves toward the vehicle body so as to match the shape of the vehicle body, and the web on the vehicle body side does not buckle. In this case, since the web on the vehicle body side having the surface for attaching to the support member such as the front of the vehicle body is not subjected to any processing, wrinkles do not occur on the attaching surface.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an extruded profile 1 of a bumper for an automobile according to the present invention.
1A is a top view, and FIG. 1B is a cross-sectional view taken along line BB of FIG. 1A.

The extruded profile 1 of a bumper for an automobile according to the present invention is composed of two webs 2 and 3 parallel to the vehicle body and the webs 2 and 3.
At both ends 1a of the extruded profile having a rectangular cross section with two flanges 4 and 5 perpendicular to 3, the two flanges 4 and 5 are seated inward of the extruded profile 1. Only the web 3 on the outer side of the vehicle body is bent to bend toward the vehicle body so as to match the shape of the vehicle body, and the web 2 on the vehicle body side is not buckled and is not subjected to any processing. Incidentally, FIG.
In (a), the flange 4 is positioned beyond the surface of the flange 5.

Here, the reason why the two flanges 4 and 5 buckle inward of the extruded profile 1 is that the two flanges 4 and 5 are outward of the extruded profile 1 as shown by the two-dot chain line. When you buckle,
This is because the buckled flanges 4 and 5 get out of the way and interfere when inserting into the bumper 50 shown in FIG. Further, as shown in FIGS. 2 to 4, the reinforcing rib 6 is also provided in the extruded shape member 1 in which a web or a flange as the reinforcing rib 6 is provided and the cross section has a sun, square or square shape. Buckling in the extruded profile 1. The direction in which the reinforcing rib 6 buckles does not matter.

An apparatus for molding both ends of the extruded profile 1 of the present invention and a molding method thereof will be described with reference to FIGS. 5 and 6. FIG. 5A is a front view and FIG. 5B is a side view, which is a graph showing an example of timings at which horizontal and vertical loads are applied. In FIG. 5, 7 is a horizontal base, 8
Is a vertical load jig, and 9 is a horizontal load jig.

The vertical load jig 8 is an end 1a of the extruded profile.
Is a jig that is arranged above and is lowered in the direction of the horizontal base 7 to bend the web 3 on the outer side of the vehicle body of the extruded profile end portion 1a by applying a vertical load. When viewed from the front side, the width 8b of the vertical load jig 8 is wide enough to cover the width of the web 3 on the outer side of the vehicle body, and when viewed from the side surface, it depends on the type of the profile material matched to the vehicle body. It has a predetermined length 8c in the axial direction of the extruded profile and has an inclined surface 8a. The angle α of the inclined surface 8a is the desired bending angle α of the extruded profile end portion 1a,
That is, it is set to be the same as the angle α for inclining the web 3 on the outer side of the vehicle body from the horizontal direction to the vehicle body side.

The horizontal loading jig 9 is an end portion 1a of the extruded shape member.
Are placed right below the vertical loading jig 8 on both side surfaces of the extrusion profile, and a horizontal load is applied from the side surface of the extrusion profile to the inside to extrude both flanges 4 and 5 of the extrusion profile end 1a. A jig for buckling the material inward. This horizontal load jig 9
Has a plate shape when viewed from the side, and the central shaft 9
It is rotatable about a and is normally held horizontally by a spring 9b provided around the shaft 9a. Then, when the vertical load jig 8 descends and approaches when the both flanges 4 and 5 are horizontally loaded, the vertical load jig 8 is rotated about the shaft 9a in accordance with the inclined surface 8a of the vertical load jig 8. The vertical load jig 8 does not prevent the vertical load jig 8 from applying a vertical load.

A method of molding both ends 1a of the extruded profile of the present invention to be molded by the above apparatus will be described. Extruded profile 1
The web 3 on the outer side of the vehicle body is oriented upward, and the web 2 on the vehicle body side is oriented toward the horizontal base 7. At both ends 1a of the extruded profile, two flanges are formed by the horizontal loading jig 9. The inner side of the extruded profile end 1a (arrow 1
Add a horizontal load to 1). Further, subsequently, the vertical load jig 8 applies a vertical load downward (arrow 10) to the web 3 on the outer side of the vehicle body.

The two flanges 4 and 5 are extruded profile end portions 1a.
When the vertical loading jig 8 approaches the horizontal loading jig 9 when it begins to buckle inwardly, the horizontal loading jig 9 does not interfere with the vertical loading by the vertical loading jig 8. Is rotated about the inclined surface 8a of the vertical load jig 8. Further, the vertical load jig 8 continues to apply a vertical load until the web 2 on the vehicle body side (the web 2 side (from the horizontal position) reaches a desired angle α that matches the shape of the vehicle body from the horizontal position. Bend to arrow 12). In this way, both ends 1a of the extruded shape member are formed, and the extruded shape member 1 conforms to the shape of the vehicle body.
To get

FIG. 6 shows an example of the timing of applying horizontal and vertical loads in the method of molding both ends 1a of the extruded profile of the present invention. During the initial period of time 14, only horizontal load is applied to the flanges 4 and 5 by the horizontal load jig 9, and after that, horizontal load is continuously applied during the time 15 while the vertical load jig 8 is applied to the outside of the vehicle body. A vertical load is applied to the side web 3. Then, after the time point C when the flanges 4 and 5 start to buckle inward of the extruded profile due to horizontal load,
Only vertical load. This is because the flanges 4 and 5, which have started to buckle inward of the extruded profile, do not buckle outward of the extruded profile due to vertical load after time C.

Time 16 is a time during which the web 3 on the outer side of the vehicle body is bent and the flanges 4 and 5 are buckled only by the vertical load, and the time when the web 3 is completely bent to the desired angle α. Continue until D. Further, a time 17 after the time point D is a time for stabilizing the buckling of the web 3 and the flanges 4 and 5 curved to a desired angle, and a constant vertical load is continuously applied. When the bending of the web 3 and the buckling of the flanges 4 and 5 are stable and the shape of the end 1a of the extruded shape member is fixed, the vertical load is gradually reduced, and the molding is completed.

FIG. 7 is a diagram showing another apparatus for molding both ends of the extruded profile 1 according to the present invention and a molding method therefor. Figure 7
5 is different from FIG. 5 in that the vertical load jig is a vertical load roller 18. The vertical load roller 18 moves in the direction of arrow 19 to apply a downward vertical load to the web 3 on the vehicle outer side. Such a vertical load roller 18 does not need to change the axial length of the extruded profile of the vertical load jig depending on the type of the extruded profile.

[0023]

The extruded profile of the automobile bumper of the present invention described above does not buckle the web on the vehicle body side having the surface for attaching to the support member such as the vehicle body front, and does not perform any processing. Wrinkles do not occur on the mounting surface to the supporting member, and there is no problem that the wrinkling of the mounting surface makes it difficult to mount the extruded profile on the supporting member such as the front of the vehicle body as in the conventional case. As a result, it becomes easier to mount the bumper for an automobile on a supporting member such as the front of the vehicle body than the extruded profile.

Further, according to the method for forming the end portion of the extruded profile of the present invention described above, since the web on the vehicle body side having the surface for attaching to the supporting member such as the vehicle body front is not subjected to any processing, the attaching surface is wrinkled. The core is precisely designed to reduce the occurrence of wrinkles as in the past, and it is easy to mold without the difficulty of making fine adjustments to achieve proper synchronization with the vertical load roller. .

The extruded profile of the automobile bumper according to the present invention has a reduced cross-sectional area toward the end, so that the load generated at the time of collision is reduced and the deformation amount at the time of collision is also reduced. is there.

[Brief description of drawings]

FIG. 1 is a view showing an extruded shape member of an automobile bumper according to the present invention.

FIG. 2 is a sectional view taken along line BB in FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a diagram showing a method of forming an end portion of an extruded shape member of an automobile bumper according to the present invention.

FIG. 6 is a graph showing a timing of applying a horizontal load and a vertical load.

FIG. 7 is a view showing another method for forming the end portion of the extruded shape member of the automobile bumper according to the present invention.

FIG. 8 is a diagram illustrating a bumper.

FIG. 9 is a view showing an extruded profile of a conventional automobile bumper.

10 is a cross-sectional view taken along the line AA of FIG.

11 is a cross-sectional view taken along the line AA of FIG.

12 is a cross-sectional view taken along the line AA of FIG.

FIG. 13 is a diagram showing a conventional method for forming an end portion of an extruded profile for a bumper for an automobile.

[Explanation of symbols]

 1 Extruded Profile 1a End of Extruded Profile 2 Car Body Side Web 3 Car Body Outer Side Web 4, 5 Flange α Curvature Angle 51 Stay (Vehicle Side)

Claims (2)

[Claims] 1. A columnar automobile for use in a front surface of an automobile or the like, which has two or more webs parallel to a vehicle body and two or more flanges perpendicular to the webs and which has a rectangular cross-sectional profile. An extruded profile of a bumper, in which the two outer flanges buckle inward of the extruded profile at both ends of the extruded profile, and only the web outside the vehicle body matches the shape of the vehicle body. The extruded profile of the automobile bumper is curved so that the web on the vehicle body side is not buckled. 2. An extruded profile of a columnar automobile bumper having a rectangular cross-section with two or more webs parallel to the vehicle body and two or more flanges perpendicular to the webs, and The web that is the side is supported upward from the side of the web that is the vehicle body side, and at both ends of the extruded profile, two flanges on the outer side apply a load to the inner side of the extruded profile. In addition, a load is applied to the web on the outer side of the vehicle body to buckle the two flanges to the inner side of the extruded profile, and the web on the outer side of the vehicle body is aligned with the shape of the vehicle body. An end forming method for an automobile bumper extruded profile, which is characterized in that it is formed on the vehicle body side as described above.