JP2003252056A - Aluminum alloy door beam material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent or reduce occurrence of fine splitting on the outside A of a bent part of a door beam material made of aluminum alloy extruded material, when a lengthwise part of the door beam material is crushed by a press in a direction perpendicular to a flange surface (in parallel with the vertical direction of the door beam material) and both webs are buckled outward. <P>SOLUTION: This door beam material comprises a pair of flanges 1, 2 and a pair of webs 3, 4 connecting them, and projections 5, 6 and projections 7, 8 are respectively formed on both sides of a substantial mid-point of the inner side of the web 3 and on both sides of a substantial mid-point of the inner side of the web 4, as viewed in a cross section perpendicular to the extruded direction. When the door beam material is crushed in the direction perpendicular to the flange surface, the projections 5 to 8 are pinched between the buckled webs 3, 4, thus reducing the shrinking of the radius of curvature of the outside A of the web compared with the shrinking without the projections since the projections act as resisting members. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum alloy door beam material used for a door beam used for reinforcing a door of an automobile such as a passenger car and a truck.

[0002]

2. Description of the Related Art Vehicles are equipped with various types of cushioning members for protecting passengers from the impact of a collision as part of safety measures. In order to protect the occupant from the vehicle, a transverse beam (door beam) for reinforcement has been installed inside the door. The door beam is mainly intended to prevent obstacles from entering the inside of the door as much as possible. It is required to have high rigidity and high ability to absorb energy at the time of collision, and there is also a demand for weight reduction. Hollow alloy extrusions have been applied.

As described in Japanese Unexamined Patent Publication No. 2001-240930, in order to ensure the safety of passengers, the vehicle models to which the door beam is applied tend to spread to small vehicles. In that case,
It becomes necessary to simultaneously house components such as door beams, window glass, and motors in a relatively thin door thickness. Therefore, it has been proposed to crush a part of the aluminum alloy extruded material in the length direction to secure a storage space. Further, in Japanese Unexamined Patent Publication No. 9-58386, a part of the aluminum alloy extruded material in the length direction is crushed,
It has been proposed to use it as an attachment part to the door.

[0004]

As shown in FIG. 15 (a), an aluminum alloy door beam material made of extruded aluminum alloy generally has a pair of flanges each having a uniform thickness and parallel to each other, and It consists of a pair of vertically connected webs, and the webs also have a uniform plate thickness.
This is flatly crushed by a press in a direction perpendicular to the flange surface (parallel to the height direction of the door beam material), and for example, as shown in FIG.
When both webs are buckled outward as shown in (b), when the degree of crushing is large (height h is small),
The web bends into a shape close to a 180 degree close contact bend, and the radius of curvature near the tip A on the outer side of the bend becomes small, and cracks may appear here, and the appearance may be poor and dangerous.

The present invention has been made in view of the above problems, and a door beam material made of an aluminum alloy extruded material has a part of its length direction perpendicular to the flange surface (parallel to the height direction of the door beam material). ) Is crushed flat by a press in a flat direction, and when both webs are buckled outward, it is intended to prevent or alleviate the outside of the bent portion.

[0006]

[Means for Solving the Problems] (1) When the crushing height of the aluminum alloy door beam material is small (the height h is large), naturally the swelling on the outside of the bent portion is prevented or alleviated, but the crushing is performed. Even if the height is the same (even if the height h is the same), if the decrease in the radius of curvature outside the bent portion can be suppressed, the elongation (tensile elongation) at this location will not become excessive,
It can prevent or alleviate wiggles. The door beam materials developed mainly from this viewpoint are as follows.

An aluminum alloy extruded material composed of a pair of flanges and a pair of webs connecting the flanges, and projections are formed inside each of the webs when viewed in a cross section perpendicular to the extrusion direction. Alloy door beam material. The protrusions are formed, for example, on both sides (see FIG. 1) of the web at a substantially central position inside each web (see FIG. 2) or at a substantially central position inside each web. When a part of the length of this door beam material is crushed in a direction perpendicular to the flange surface and both webs are buckled outward, the protrusions are sandwiched between the buckled webs and the central portion of the web is bent. If the height after crushing is the same, the decrease in the radius of curvature on the outer side of each web is suppressed as compared with the case where there is no protrusion.

It is made of an aluminum alloy extruded material consisting of a pair of flanges and a pair of webs that connect them, and projections are formed inside each of the webs when viewed in a cross section perpendicular to the extrusion direction, and the projections are directed inward. A door beam material made of an aluminum alloy, characterized in that a recess is formed. The protrusions are formed, for example, on both sides of a substantially central position inside each web or substantially central position inside each web (see FIG. 3), and at least a part or all of the lengthwise crush is crushed. A rod is inserted into the recess over a predetermined length at the location where it is performed. The rod is preferably made of metal. When a part of the length of the door beam member into which the rod is inserted is crushed in the direction perpendicular to the flange surface and both webs are buckled outward, the webs in which the rod portion buckles are crushed. It is sandwiched between (when foreign matter is present inside the buckled part of the web) and acts as a resistance member against the bending of the web, and if the height after crushing is the same, when there is no protrusion In comparison, the decrease in the radius of curvature on the outer side of each web is suppressed.

It is made of an aluminum alloy extruded material composed of a pair of flanges and a pair of webs connecting them, and a rod is attached to the inner surface of each web in the extrusion direction (see FIG. 4), or a metal is formed in the hollow portion. A door beam material made of an aluminum alloy, characterized in that a pipe made therein is inserted (see FIG. 5). In this case, a rod is attached or a metal pipe is inserted in at least part of the lengthwise direction where crushing is performed. The sticking positions of the rods when viewed in cross section are, for example, substantially central positions inside each web or both sides of the substantially central position inside each web. The rod is also preferably made of metal. When a portion where the rod is attached or a metal pipe is inserted in a part of the length of the door beam material is crushed in a direction perpendicular to the flange surface and both webs are buckled outward, Or, a part of the pipe is sandwiched between the buckled webs (a foreign substance is present inside the buckled part of the web) and acts as a resistance member against the bending of the web, and the height after crushing is high. Are the same,
The decrease in the radius of curvature on the outer side of each web is suppressed as compared with the case where there is no protrusion.

A part of the aluminum alloy extruded material consisting of a pair of flanges and a pair of webs in the lengthwise direction is crushed in a direction perpendicular to the flange surface and both webs are buckled outward. A door beam material made of an aluminum alloy, in which foreign matter is present for a predetermined length inside the bent portion. This includes, in addition to the door beam material described in the above, for example, a rod which is not fixed to the web and is sandwiched between both webs that buckle outward (see FIG. 6). In that case, the foreign matter (rod) may be extracted after crushing.

It consists of an aluminum alloy extruded material consisting of a pair of flanges and a pair of webs connecting them, and when viewed in a cross section perpendicular to the extrusion direction, the inner surfaces of the left and right overhanging portions of the flanges are inclined in the direction of outward expansion. Is formed (see FIG. 7), the inner surfaces of the left and right overhanging portions of the flange are located outside in the height direction with respect to the inner surface of the portion sandwiched by the web (see FIG. 8), or both the flange and the flange. A door beam material, characterized in that the outer corner R (radius of curvature) of the portion where the webs are connected is formed smaller than the inner corner R (see FIG. 9).
When a part of the length of this door beam material is crushed in the direction perpendicular to the flange surface and both webs are buckled outward,
In the vicinity of the connecting portion with the flange, the web tends to bend outward with a large curvature, and if the height after crushing is the same, the decrease in the radius of curvature of the outer side of the web in the central portion of the web is suppressed accordingly.

A part of the aluminum alloy extruded material consisting of a pair of flanges and a pair of webs connecting them is crushed in a direction perpendicular to the flange surface and both webs are buckled outward. A door beam material made of an aluminum alloy, characterized in that the central portion of the flange is crushed more than the right and left sides (see FIG. 10). With this door beam material, the crushed flange is inclined outward,
The curvature of the web in the vicinity of the connection with the flange is shown in FIG.
Even in the same degree as in the conventional example, the decrease in the radius of curvature on the outside of the web in the central portion of the web can be suppressed by the amount that the flange is inclined outward.

(2) When the aluminum alloy door beam material is crushed by a press, it is difficult to stably obtain the crush height as designed in the actual working process, and it tends to be crushed more than necessary. In this case, even if the height h of the door beam material itself is allowed to be small, there is a problem that the radius of curvature outside the bent portion is reduced and the outside of the bent portion is covered. However, on the contrary, if crushing more than necessary can be prevented, it is possible to prevent or alleviate the decrease in the radius of curvature outside the bent portion and the bending of the bent portion. The door beam materials developed mainly from this point of view are as follows.

It is made of an aluminum alloy extruded material consisting of a pair of flanges and a pair of webs connecting them, and when viewed in a cross section perpendicular to the extrusion direction, a part of the portion sandwiched by both the webs of the pair of flanges is the other part. Door beam material made of aluminum alloy, which is formed closer to each other than the location. As a specific cross-sectional shape, for example, each flange has a substantially constant thickness over the entire width, and one or both of them has a portion sandwiched between the webs protruding inward (see FIG. 11), or both. It is conceivable that one or both of the flanges is thickened inwardly between the webs (see FIGS. 12 and 13). When a part of the length of this door beam material is crushed in a direction perpendicular to the flange surface and both webs are buckled outward, the portions of the pair of flanges formed close to each other come into contact with each other. The resistance against crushing becomes large, the crushing stops further than in the conventional cross-sectional shape, and the decrease in the radius of curvature on the outer side of each web is suppressed. In the door beam materials (1) to (4) as well, the protrusions or the foreign matter are sandwiched inside the buckled web, so that the resistance against crushing increases and the progress of crushing is suppressed as compared with the conventional cross-sectional shape.

[0015]

DETAILED DESCRIPTION OF THE INVENTION Referring to FIGS.
The aluminum alloy door beam material according to the present invention will be described more specifically. The door beam material shown in FIG. 1 (a) is made of an aluminum alloy extruded material composed of a pair of parallel flanges 1 and 2 and a pair of webs 3 and 4 vertically connecting the flanges. Protrusions 5, 6 and 7, 8 having semicircular cross sections are formed on both sides of the substantially central position. It differs from the door beam member of FIG. 15 only in that the projections 5 to 8 are formed. Crush this door beam material in the direction perpendicular to the flange surface and
When both are buckled outward, as shown in Fig. 1 (b),
Between the curved webs 3 of the protrusions 5 and 6, and also between the protrusions 7 and 8
Are sandwiched between the bent webs 4 and abut each other. The projections 5 to 8 prevent the webs 3 and 4 from being bent in a shape close to 180 degree close contact bending, and thus, if the crushing height h is the same, the difference between the projections 5 to 8 is that there is no difference. Compared to 15 door beam materials, each buckled web 3,
A decrease in the radius of curvature near the tip A on the outer side of 4 is suppressed.
The same applies when the state is further crushed from the state of FIG. If the cross-sectional shapes of the door beam webs 3 and 4 are formed so as to project outward near the center position, as shown in FIG. 1C, the webs 3 and 4 will buckle outward. It will be easier. This also applies to other door beam materials.

The door beam material shown in FIG. 2 (a) is made of an aluminum alloy extruded material composed of a pair of parallel flanges 11 and 12 and a pair of webs 13 and 14 vertically connecting the flanges. Protrusions 15 and 16 each having a semicircular cross section are formed at a substantially central position on the inside. The door beam member of FIG. 15 is different only in that the protrusions 15 to 16 are formed. When this door beam material is crushed in a direction perpendicular to the flange surface and both webs 13 and 14 are buckled outward, as shown in FIG. The protrusion 16 is sandwiched between the bent webs 14. The protrusions 15 and 16 are the web 1
3 and 14 are prevented from being bent in a shape close to 180 degree close contact bending, and as a result, if the crushing height h is the same, compared with the door beam material of FIG. The decrease in the radius of curvature near the outer tips A of the buckled webs 13 and 14 is suppressed. The same applies when the state of FIG. 2B is further crushed. The cross-sectional shape of the door beam webs 13 and 14 is shown in FIG.
If the webs 13 and 14 are formed so as to project outward as a whole as shown in (c), the webs 13 and 14 are likely to buckle outward. This also applies to other door beam materials.

The door beam material shown in FIGS. 3 (a) and 3 (b) is made of an aluminum alloy extruded material composed of a pair of parallel flanges 21 and 22 and a pair of webs 23 and 24 vertically connecting the flanges. In a), the projections 25, 2 each having an inward concave portion at a substantially central position inside each web 23, 24.
6 is formed, and in (b), similar projections 25, 26 and 27, 28 are formed on both sides of the webs 23, 24 so as to sandwich the substantially central positions inside, and further, at predetermined positions in the length direction thereof. A metal rod 29 is inserted in the recess. The door beam member of FIG. 15 is different only in that the protrusions 25 to 28 are formed. This door beam material is crushed in the direction perpendicular to the flange surface, and both webs 23,
When both 24 are buckled outwardly, the projections 25 to 28 and the rod 29 are sandwiched between the bent webs 23 and 24 in the same manner as the projection of the door beam material shown in FIG. 1 or 2. The rod 29 may be pulled out from the squeezed door beam material.

The door beam material shown in FIG. 4 is an aluminum alloy extruded material comprising a pair of parallel flanges 31 and 32 and a pair of webs 33 and 34 vertically connecting the flanges (the same as the door beam material of FIG. 15 per se). ), And at each predetermined position in the length direction, each web 33,
Metal rods 35 are attached to both sides of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface of the inner side surface. Crush this door beam material in the direction perpendicular to the flange surface,
When both webs 33 and 34 are buckled outward, the rod 35 is sandwiched between the bent webs 33 and 34 in the same form as the projection of the door beam material shown in FIG.

The door beam material shown in FIG. 5 (a) is an aluminum alloy extruded material composed of a pair of parallel flanges 41, 42 and a pair of webs 43, 44 vertically connecting the flanges (the door beam of FIG. 15 itself). Same as the material),
Further, a metal pipe 45 is inserted into the hollow portion at a predetermined position in the length direction. This door beam material is crushed in the direction perpendicular to the flange surface, and both webs 43,
When both 44 are buckled outward, the left and right ends of the crushed pipe 45 are sandwiched inside the respective bent portions at the same time, whereby the same effect as the projection of the door beam material shown in FIG. 1 or 2 is obtained. To be The pipe 45 may be pulled out from the squeezed door beam material.

The door beam material shown in FIG. 6 (a) is an aluminum alloy extruded material comprising a pair of parallel flanges 51, 52 and a pair of webs 53, 54 vertically connecting the flanges 51, 52 (the door beam itself of FIG. 15). The same as the material).
Metal rods 55, 56 are brought into close contact with the inside central positions of the webs 53, 54 of the door beam material, and the aluminum alloy extruded material is crushed in a direction perpendicular to the flange surface while maintaining the state, and both webs 53, 54 are When both are buckled outward, as shown in FIG. 6B, the rod 55 is sandwiched between the bent webs 53 and the rod 56 is bent between the webs 54, and the door beam member shown in FIG. It works like a projection. The rods 55 and 56 may be extracted from the crushed door beam material shown in FIG.

The door beam material shown in FIG. 7 (a) is made of an aluminum alloy extruded material consisting of a pair of mutually parallel flanges 61 and 62 and a pair of webs 63 and 64 that vertically connect them. When viewed in a vertical cross section, the pair of flanges 61 and 62 have left and right overhanging portions (portions outside both webs) 61a and 61b, respectively.
Inner surfaces 61aa, 61ba, 62aa of the 62a, 62b,
62ba is formed to be inclined in the direction of the outward expansion.
Except for that point, it is the same as the door beam material of FIG.
When this door beam member is crushed in a direction perpendicular to the flange surface and both webs 63 and 64 are buckled outward, the web is made in the vicinity of the connecting portion B with the flanges 61 and 62, as shown in FIG. 7B. 63 and 64 tend to bend outward with a large curvature, and the decrease in the radius of curvature of the vicinity A of the outer end of the web in the central portion of the web is suppressed accordingly. The same applies when the state of FIG. 7B is further crushed. In addition, even if only one of the flanges 61 and 62 is inclined, the inner surfaces of the left and right projecting portions are inclined in the direction of the outward expansion, the corresponding effect can be obtained.

The door beam material shown in FIG. 8 is made of an aluminum alloy extruded material composed of a pair of parallel flanges 71 and 72 and a pair of webs 73 and 74 which vertically connect the flanges 71 and 72. Parts 71a, 71
inner surface 71aa, 71ba, 72a of b, 72a, 72b
a and 72ba are located outside in the height direction from the inner surface of the portion sandwiched by the webs. Since the height of the door beam member is the same in the entire width of the flange (the outer surface side of each of the flanges 71 and 72 is flat), the protruding portion 71 of the flanges 71 and 72 is
The thicknesses of a, 71b, 72a, 72b are thinner than the thickness of the portions sandwiched by the webs (t ₂ > t ₁ , t ₄ >).
t ₃ ), except that point, it is the same as the door beam member of FIG. 15. When this door beam material is crushed in the direction perpendicular to the flange surface and both webs 73 and 74 are buckled outward, flange 7 is formed in the same manner as the door beam material of FIG.
The webs 73, 74 tend to bend outward with a large curvature in the vicinity of the connection with the first and the second parts 72, and the decrease in the radius of curvature near the tip of the web outside at the center of the web is suppressed accordingly. It should be noted that even if only one of the flanges 71 and 72 has the inner surface of the left and right overhanging portions located outside, a corresponding effect is obtained.

The door beam material shown in FIG. 9 is made of an aluminum alloy extruded material composed of a pair of parallel flanges 81 and 82 and a pair of webs 83 and 84 which vertically connect the flanges, and the flanges are connected to both webs. The R (radius of curvature) of the outer corners 85a to 85d of the location is the inner corner 8
It is formed smaller than R (radius of curvature) of 6a to 86d. It is desirable to form R (radius of curvature) of the outer corners 85a to 85d as small as possible. This door beam material is crushed in a direction perpendicular to the flange surface, and both webs 8
When both 3 and 84 are buckled outward, the webs 83 and 84 tend to bend outward with a large curvature in the vicinity of the connecting portion with the flanges 81 and 82, as in the door beam member of FIG. Therefore, the decrease in the radius of curvature near the tip on the outside of the web in the central portion of the web is suppressed. Even if only the corner portion where either one of the flanges 71 and 72 is connected to both webs is set as described above, there is a corresponding effect.

The door beam material shown in FIG. 10 (a) is made of an aluminum alloy extruded material composed of a pair of parallel flanges 91, 92 and a pair of webs 93, 94 vertically connecting the flanges 91, 92. It is the same as the door beam material of the above, but when it is crushed in the direction perpendicular to the flange surface and both webs are buckled outward, they are not crushed evenly over the entire width direction of the flange as in the previous examples. The point is characteristic. As shown in FIG. 10B, when a pressing tool 95 having a central portion 95a protruding and the left and right sides inclined rearward, the central portion of the flange 91 is crushed more than the left and right sides thereof, and the flange 91 inclines outward. . As a result, the center portions of the bent webs 93 and 94 are not crushed severely, and the outer side A of the web at the center portion of the web is prevented.
It is possible to suppress the decrease in the radius of curvature of. In addition, the height of the central portion of the door beam member can be reduced for the entire amount of crushing.

The door beam material shown in FIG. 11 (a) is made of an aluminum alloy extruded material composed of a pair of flanges 101 and 102 and a pair of webs 103 and 104 connecting them, and when viewed in a cross section perpendicular to the extrusion direction. The pair of flanges 101 and 102 have a substantially constant thickness and are arranged in parallel with each other (the flange 1 except for a part in the width direction).
01 and 102 are parallel and the height of the door beam material is the same)
However, the central portion of the portion sandwiched between the webs 103 and 104 projects inward over a predetermined width (protruding portions 101a and 102a), and the webs 103 and 10
Protrusions 105, 106 and 107, 108 having a semicircular cross section are formed on both sides of the substantially central position on the inner side of 4. Therefore, it differs from the door beam member of FIG. 1A only in that the protrusions 101a and 102a are formed.

When this door beam member is crushed in a direction perpendicular to the flange surface and both webs 103 and 104 are buckled outward, as shown in FIG.
The opposing surfaces of a and 102a come into contact with each other, and the resistance against crushing increases suddenly here, and further reduction of the radius of curvature of the outside of the crushed and bent webs 103 and 104 is suppressed. This action is the projection 105-10
It does not matter whether or not there is 8. The protrusion may be formed only on one side of the flange. Further, the projections 105 to 108 act in the same manner as the projections of the door beam material shown in FIG. Figure 1
In the case of the door beam material shown in FIG. 1 (a), as shown in FIG. 11 (c), when the height h when crushed is the same as the door beam material shown so far, the protrusions 101a, 102 are formed.
The height h1 at a becomes small. That is, without increasing the crushing amount of the door beam material (each web 10
The height of the central portion of the door beam material (projections 101a, 102a) without significantly reducing the radius of curvature of 3, 104.
Height) can be reduced.

The door beam material shown in FIG. 12 (a) is made of an aluminum alloy extruded material consisting of a pair of flanges 111 and 112 and a pair of webs 113 and 114 connecting them, and when viewed in a cross section perpendicular to the extrusion direction. , The pair of flanges 111 and 112 are webs 113 and 1 respectively.
The portion sandwiched between 14 is formed thickly toward the inside over a predetermined width, and both are arranged in parallel to each other (the flanges 101 and 102 are parallel except for a part in the width direction, and the height of the door beam member is the entire width). Same). It is the same as the door beam member of FIG. 15 except that there is the thick portion. Further, the door beam material shown in FIG. 13A is made of an aluminum alloy extruded material composed of a pair of flanges 121 and 122 and a pair of webs 123 and 124 connecting them, and when viewed in a cross section perpendicular to the extrusion direction, Flange 1
The portion of the flange 21 sandwiched between the webs 123 and 124 is formed thickly toward the inside over a predetermined width, and the flange 1
21 and 122 are arranged in parallel to each other (the flanges 121 and 122 are parallel except for a part in the width direction, and the height of the door beam member is the same in all width). It is the same as the door beam member of FIG. 15 except that there is the thick portion. In these door beam members, the thick portion is the protrusion 101 of the flange 101, 102 of the door beam member shown in FIG.
a and 102a, which have the same action as in FIGS.
As shown in FIG. 3 (b), when crushed, they come into contact with the flange surfaces facing each other or with each other to prevent further crushing.

The door beam member shown in FIG. 14 comprises a pair of parallel flanges 131 and 132 and a pair of webs 133 and 134 vertically connecting the flanges 131 and 132.
Recesses 135, 136 and 137, 138 having a semicircular cross section are formed on both sides of the inner side of the inner side of the inner side of the inner side of the inner side of the central portion. When this extruded aluminum alloy material is crushed in the direction perpendicular to the flange surface and both webs 133 and 134 are buckled outward, the recesses 135 to 138 preferentially buckle, and as a result, as shown in FIG. ),
It is prevented that the depressions 135 and 136 and the depressions 137 and 138, that is, the central positions of the webs 133 and 134 are bent in a shape close to a 180-degree close bend. As a result, if the crushing height h is the same, the curvature of the vicinity A of the outer ends of the buckled webs 133 and 134 is different from that of the aluminum alloy extruded material of FIG. 15 which is different only in that there are no depressions 135 to 138. Reduction of radius is suppressed. The same is true when the state of FIG. 14B is further crushed.

The above-mentioned characteristic portions of the door beam members of various forms can be combined with each other. For example, the form shown in FIGS. 7 to 10 can be combined with all other forms, and the form shown in FIGS. 1 to 6 is shown in FIGS.
It can be combined with the form shown in. In addition, generally, if the web thickness is large, the strain load when buckling becomes large, and burrs are likely to occur outside the bent portion of the web. Therefore, the web thickness may be thin, for example, 2 mm or less. desirable.

When the aluminum alloy door beam material is crushed, the extruded material may be cut into a predetermined length and then a necessary portion may be crushed by a press, but FIG. 3 of JP-A-9-58386 is used. As described in
With respect to a long extruded material, a position corresponding to a required crushing portion of the door beam material is crushed by a press die, and then the extruded material is cut to obtain each short door beam material. The crushing by the press die may be performed after the long extruded material is separated from the hot extrusion press, that is, offline, or may be performed online without separation. Further, the cutting may be performed after the crushing, or may be performed simultaneously with the crushing. Further, as described in FIG. 4 of Japanese Patent Application Laid-Open No. 9-58386, a press die having a corresponding end face shape in order to make the shape of the crushed portion match the shape of a mounting portion such as a door. It is also possible to use.

Door beam material made of aluminum alloy is made of Al-
When it is made of a heat-treatable aluminum alloy extruded material such as Mg-Si-based or Al-Zn-Mg-based, it is desirable that the crushing process is performed in the T1 state after extrusion and then an aging treatment as a manufacturing process. In particular, after extrusion, it is desirable to carry out crushing before natural aging progresses, and preferably within 1 hour after extrusion. If drilling or thread cutting is required, it can be performed after aging treatment.

[0032]

When manufacturing a door beam having a crushed portion in a part of its length, a door beam material made of an aluminum alloy extruded material is flatly crushed by a press in a direction perpendicular to the flange surface, and both webs are crushed. When both are buckled outward, by suppressing the decrease in the radius of curvature near the tip on the outside of the bent part, the elongation (tensile elongation) at this point
Can be prevented or mitigated by making sure that it does not become excessive. Therefore, according to the present invention, the crushed portion of the door beam has a good appearance and the safety is improved.

[Brief description of drawings]

FIG. 1 is a sectional view (a) of a door beam material according to the present invention before being crushed, a sectional view (b) when it is crushed to a height h, and a sectional view (c) of another similar shape. is there.

FIG. 2 is a sectional view (a) of another door beam member before being crushed, a sectional view (b) when crushed to a height h, and a sectional view (c) of another similar shape.

FIG. 3 is a sectional view (a) and (b) of another door beam member before being crushed.

FIG. 4 is a sectional view of another door beam member before being crushed.

FIG. 5 is a cross-sectional view of another door beam member before being crushed (a) and a cross-sectional view when crushed to a height h (b).
Is.

FIG. 6 is a sectional view of another door beam member before being crushed (a) and a sectional view when crushed to a height h (b).
Is.

FIG. 7 is a sectional view of another door beam member before being crushed (a) and a sectional view when crushed to a height h (b).
Is.

FIG. 8 is a cross-sectional view before crushing another door beam member.

FIG. 9 is a cross-sectional view of another door beam member before being crushed.

FIG. 10 is a cross-sectional view (a) before crushing another door beam member and a cross-sectional view (b) after crushing.

FIG. 11 is a cross-sectional view (a) before crushing of another door beam member, a cross-sectional view (b) when crushed, and a cross-sectional view (b) at a crushing height h.

FIG. 12 is a cross-sectional view (a) before crushing another door beam member and a cross-sectional view (b) when crushed.

FIG. 13 is a cross-sectional view (a) before crushing another door beam member and a cross-sectional view (b) when crushed.

FIG. 14 is a sectional view (a) of another door beam member before being crushed, and a sectional view (b) when it is crushed to a height h.

FIG. 15 is a cross-sectional view (a) of a conventional aluminum alloy extruded material before crushing and a cross-sectional view (b) when crushed to a height h.

[Explanation of symbols]

1, 2, 11, 12, 21, 22, 31, 32, 41,
42, 51, 52, 61, 62, 71, 72, 81, 8
2, 91, 92, 101, 102, 111, 112, 1
21, 122, 131, 132 Flange 3, 4, 13, 14, 23, 24, 33, 34, 43,
44, 53, 54, 63, 64, 73, 74, 83, 8
4, 93, 94, 103, 104, 113, 114, 1
23, 124, 133, 134 Webs 5-8, 15-16, 25-28 Protrusions 29, 35 formed on the web Metal rod 45 Metal ring

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masatoshi Yoshida             1-5-5 Takatsukadai, Nishi-ku, Kobe City, Hyogo Prefecture             Kobe Steel Co., Ltd.Kobe Research Institute (72) Inventor Nao Aiura             14-1 Chofu Minatomachi, Shimonoseki City, Yamaguchi Prefecture Co., Ltd.             Kobe Steel Chofu Factory

Claims (12)

[Claims] 1. An aluminum alloy extruded material comprising a pair of flanges and a pair of webs connecting the flanges, wherein projections are formed inside each of the webs when viewed in a cross section perpendicular to the extrusion direction. Aluminum alloy door beam material. 2. The aluminum alloy door beam material according to claim 1, wherein the projection has an inward recess when viewed in a cross section perpendicular to the extrusion direction. 3. The aluminum alloy door beam member according to claim 2, wherein a rod is inserted into the recess. 4. An aluminum alloy extruded material comprising a pair of flanges and a pair of webs connecting the flanges, and a part of a portion sandwiched between the webs of the pair of flanges when viewed in a cross section perpendicular to the extrusion direction. Door beam material made of aluminum alloy, which is formed closer to each other than other locations. 5. An aluminum alloy extruded material comprising a pair of flanges and a pair of webs connecting the flanges, a rod is attached to the inner surface of each web along the extrusion direction, or a metal pipe is provided in the hollow portion. Door beam material made of aluminum alloy characterized by being inserted. 6. An aluminum alloy extruded material comprising a pair of flanges and a pair of webs connecting the flanges, and when viewed in a cross section perpendicular to the extrusion direction, the inner surfaces of the left and right overhanging portions of the flanges extend in the outward direction. It is formed to be inclined, the inner surface of the left and right overhanging portions of the flange is located outside in the height direction from the inner surface of the place sandwiched by the web, or the outer corner of the place where the flange and both webs are connected An aluminum alloy door beam material, wherein R is smaller than the inner corner R. 7. The aluminum alloy door beam member according to claim 1, 4 or 6 is crushed in a direction perpendicular to a flange surface so that both webs are buckled outward. Aluminum alloy door beam material characterized by: 8. The aluminum alloy door beam member according to claim 3 is crushed in a direction perpendicular to a flange surface at a part of the longitudinal direction where the rod is inserted, and both webs are outwardly moved. Aluminum alloy door beam material characterized by being buckled. 9. A portion of the aluminum alloy door beam member according to claim 5 to which the rod is attached or a metal pipe is inserted in the longitudinal direction is crushed in a direction perpendicular to the flange surface. , Aluminum alloy door beam material characterized in that both webs are buckled outward. 10. An aluminum alloy extruded material comprising a pair of flanges and a pair of webs connecting the flanges, in which a part of the longitudinal direction is crushed in a direction perpendicular to the flange surface, and both webs are buckled outward. The aluminum alloy door beam material is characterized in that foreign matter is present inside the buckled portion of each web for a predetermined length. 11. The aluminum alloy door beam member according to claim 10, wherein the foreign matter is extracted. 12. An aluminum alloy extruded material comprising a pair of flanges and a pair of webs connecting the flanges, in which a part of the longitudinal direction is crushed in a direction perpendicular to the flange surface and both webs are buckled outward. The aluminum alloy door beam material is characterized in that the center portion of the flange is crushed more than the right and left sides.