JP2008213625A - Manufacturing method of energy absorbing member for automobile and energy absorbing member for automobile manufactured by the manufacturing method - Google Patents

Abstract

An object of the present invention is to ensure the safety of passengers by smoothly and reliably absorbing collision energy from all directions at the time of collision.
An automobile energy absorbing member 1 of the present invention is fixed to a vehicle body 8 at a vehicle body mounting side opening 5 in an energy absorbing portion 2 of a tempered hollow shape member formed by extrusion processing of a heat treatment type aluminum alloy. Since the fixing portion 6 is manufactured so as to be formed integrally, a soft portion at the time of welding is not formed in the vicinity of the vehicle body mounting side opening of the energy absorbing portion of the absorbing member, the mounting direction and the input direction of the collision energy Even if the energy absorption parts do not match, the energy absorption part does not bend and deforms, a bellows-like deformation occurs, and further proceeds in the longitudinal direction of the energy absorption part according to the impact energy, so that the absorption of the collision energy is smooth and It can be done reliably.
[Selection] Figure 4

Description

  The present invention relates to a method for producing an energy absorbing member for an automobile, particularly made of an aluminum alloy, which is attached to an upper structure of a vehicle body in order to absorb the collision energy when the automobile collides to ensure the safety of the passenger. The present invention relates to an automobile energy absorbing member manufactured by the manufacturing method.

  In recent years, the use of aluminum alloy hollow shapes has been studied for automobile energy absorbing members that absorb collision energy in the event of a collision and protect passengers by considering the weight reduction of the vehicle body. .

  By the way, the energy absorbing member for automobiles (hereinafter referred to as “absorbing member”) has an energy absorbing portion that has a square cross-sectional shape by extrusion and has both ends serving as a vehicle body mounting side opening and a bumper mounting side opening. It consists of an opening part and a plurality of side face parts. The absorption member is formed by directly fixing the vehicle body mounting side opening of the energy absorption portion to the vehicle body by welding. Therefore, when collision energy is received in the longitudinal direction of the energy absorption part from the bumper attachment side opening due to a collision, the energy absorption part to which the collision energy is input is deformed into a bellows shape from the vicinity of the bumper attachment side opening, and the energy at the time of collision is further increased. According to the size of the accordion, the bellows-like deformation is sequentially advanced in the same direction to absorb the collision energy.

  In addition, in order to ensure that the energy absorbing portion can generate bellows-like deformation, an uneven pre-deformed portion over the entire circumference of the side surface portion constituting the energy absorbing portion in the vicinity of the bumper mounting side opening of the energy absorbing portion. There has also been proposed a structure in which a soft portion is formed by heat or heat to induce a bellows-like deformation (see Patent Documents 1 and 2).

In the event of a collision, if the mounting direction of the absorbing member with respect to the vehicle body matches the input direction of the collision energy with respect to the opening on the bumper mounting side of the energy absorbing portion of the absorbing member, the energy absorbing portion to which the collision energy is input As the bellows-like deformation occurs in the longitudinal direction of the energy absorbing portion from the opening direction, and further proceeds in sequence, the collision energy is smoothly and reliably absorbed.
However, when the absorbing member is attached to the superstructure of the vehicle body, the vehicle body mounting side opening of the energy absorbing portion which is a hollow shape member is directly fixed to the vehicle body by welding. At that time, in the vicinity of the opening of the absorbing member, a soft part having a reduced rigidity due to heat during welding may be formed.
As a result, in the event of a collision, if the mounting direction of the absorbing member with respect to the vehicle body and the input direction of the collision energy with respect to the opening on the bumper mounting side of the energy absorbing portion of the absorbing member do not coincide, Before or at the same time as the bellows-like deformation of the energy absorbing part, or at the same time as the bellows-like deformation, bending deformation may occur in the soft part formed in the vicinity of the vehicle body mounting side opening of the energy absorbing part. is there. For this reason, the bending deformation that occurs in the soft part prevents the occurrence of the bellows-like deformation in the energy absorbing part, and further prevents the progress, so that the collision energy is not absorbed smoothly and reliably by the energy absorbing part.

Therefore, the fixing portion joined by welding to the vehicle body is separated so that the soft portion is not formed in the vicinity of the opening on the vehicle body mounting side of the energy absorbing portion due to the heat of welding when directly fixing to the vehicle body. There is also a type in which the fixing portion and the vehicle body are joined and fixed by welding to the vehicle body mounting side opening of the energy absorbing portion in advance. However, when the opening portion of the energy absorbing portion and the separate fixing portion are joined by welding, a soft portion is eventually formed in the vicinity of the vehicle body mounting side opening portion of the energy absorbing portion. As a result, in the event of a collision, if the mounting direction of the absorbing member with respect to the vehicle body and the input direction of the collision energy with respect to the bumper mounting side opening of the energy absorbing portion of the absorbing member do not match, the softness of the energy absorbing portion Bending deformation occurs in the portion, and the occurrence and progress of the bellows-like deformation in the energy absorbing portion are hindered, so that the collision energy is not absorbed smoothly and reliably by the energy absorbing portion.
Japanese Patent Laid-Open No. 7-145843 JP 2005-29064 A

  In the present invention, in the event of a collision, even if the mounting direction of the absorbing member with respect to the vehicle body and the input direction of the collision energy with respect to the bumper mounting side opening of the energy absorbing portion of the absorbing member do not match, the absorbing member The present invention intends to manufacture an absorbing member that surely causes a bellows-like deformation in the energy absorbing portion to absorb the collision energy smoothly and reliably.

  In order to solve the above-described problems, the present invention provides an energy absorbing member for an automobile, which is tempered after forming an aluminum alloy into a hollow section having a square cross section by extrusion, and the hollow section is used as an energy absorbing portion. Further, the fixing portion formed by fixing to the vehicle body on the vehicle body attachment side opening of the energy absorbing portion is manufactured so as to be integrally formed by bending.

Specifically, as a first feature, an aluminum alloy is extruded to form a hollow with a square cross-sectional shape composed of an opening at both ends to be a vehicle body attachment side opening and a bumper attachment side opening and a plurality of side portions. After forming the energy absorbing part that is a shape material,
Tempering,
Furthermore, after arranging slits of equal length in the longitudinal direction of the energy absorbing portion with respect to the corners formed from the edge portions of the side surfaces in the vehicle body mounting side opening of the energy absorbing portion,
By bending so as to expand a part of each side surface corresponding to each of the slits,
An energy absorbing portion having a hollow portion and a fixing portion that is fixed to the vehicle body are integrally formed at the vehicle body mounting side opening of the energy absorbing portion.

  For this reason, only the fixing portion is welded to the vehicle body, and the heat effect of the welding remains only on the fixing portion. Therefore, when the fixing portion is fixed to the vehicle body, a soft portion by welding is formed in the energy absorbing portion of the absorbing member. There is nothing. Therefore, when the absorbing member manufactured by the above manufacturing method collides, even if the mounting direction with respect to the vehicle body does not match the input direction of the collision energy with respect to the opening on the bumper mounting side of the energy absorbing portion of the absorbing member The energy absorption part will not be bent, but it will generate a bellows-like deformation near the opening on the bumper side where the collision energy is input, and will further advance in the longitudinal direction of the energy absorption part. Can be carried out smoothly and reliably.

  As the aluminum alloy used in the present invention, for example, an Al—Zn—Mg based alloy or an Al—Mg—Si based alloy is preferably applied. In order to stably improve the material strength after extrusion. In order to eliminate residual stress and homogenize crystals, it is preferable to perform tempering by heat treatment such as T5 treatment or T6 treatment.

  In addition, as the cross-sectional shape of the energy absorbing portion, various polygons can be considered depending on the place of use and the expected collision energy, but considering the cost increase in the manufacturing process including extrusion, a triangular shape or an octagon The shape is preferable.

A second feature is that the aluminum alloy has a square cross-sectional shape formed by extrusion processing of an aluminum alloy and includes a plurality of side surface portions and opening portions at both ends that become a vehicle body mounting side opening portion and a bumper mounting side opening portion, and at least faces each other. After forming into an energy absorbing part which is a hollow shape material integrally connecting between inner wall surfaces of the side surface part or between diagonal corners of a square cross-sectional shape by a partition wall,
Tempering,
Furthermore, a slit having an equal length in the longitudinal direction of the energy absorbing portion is provided for the corner portion formed by each side portion edge at the vehicle body mounting side opening of the energy absorbing portion and the connecting portion between the side portion and the partition wall. Above,
Bend so that a part of each side part corresponding to between each slit is expanded,
In addition, by cutting the partition wall corresponding to the length of the slit by cutting,
An energy absorbing portion having a hollow portion partitioned into a plurality of partitions and a fixing portion fixed to the vehicle body at the vehicle body mounting side opening of the energy absorbing portion are integrally formed.

  For this reason, as in the case of the energy absorbing member for automobiles, since the heat effect is limited to the fixed portion, the energy absorbing portion of the absorbing member is not formed with a soft portion by welding when the fixing portion is fixed to the vehicle body. . Therefore, in the case of a collision, the absorbing member according to the manufacturing method described above has energy even when the mounting direction with respect to the vehicle body and the input direction of the collision energy with respect to the bumper mounting side opening of the energy absorbing portion of the absorbing member do not match. Absorber does not bend and deforms, and from the vicinity of the opening where collision energy is input, bellows-like deformation occurs alternately at the partition wall, and further proceeds in the longitudinal direction of the energy absorber. Energy can be absorbed smoothly and reliably. In addition, since a plurality of hollow portions are formed by the partition walls in the energy absorbing portion, the strength of the energy absorbing portion in the longitudinal direction of the energy absorbing portion is increased, and the energy absorbing portion can smoothly and reliably with respect to stronger collision energy. Absorption can be performed.

In addition, it is desirable that the plurality of hollow portions formed by the partition walls in the energy absorption portion have the same shape as much as possible so that the collision energy at the time of collision can be uniformly absorbed. Therefore, when the cross-sectional shape of the energy absorbing portion is a polygon, the hollow portion is formed by a partition wall connecting the inner wall surfaces of the side surfaces of the cross-sectional shape or the corners on the diagonal line. Therefore, for example, when the cross-sectional shape of the energy absorbing portion is a hexagonal shape or an octagonal shape, the hollow portion is formed by the partition walls arranged so as to connect the corner portions on the diagonal line.
Furthermore, the hollow portion in the energy absorbing portion is appropriately formed according to the manufacturing cost and the expected level of collision energy. However, when the cross section of the energy absorbing portion is square, at least two and at most four. It is preferable that it is about ~ 6.

  As a third feature, based on the first and second features, the energy absorbing portion is held between the jigs in the longitudinal direction of the energy absorbing portion after being molded into the energy absorbing portion of the hollow section having the square cross section. Applying a compressive load above, locally applying heat to the pre-deformed part formed with irregularities on the side part that becomes the starting point of bellows-like deformation, or the side part of the energy absorbing part, or an energy absorbing member for automobiles Due to the heat at the time of joining the bumper to the bumper, the soft part that is the starting point of the bellows-like deformation is located in the vicinity of the bumper mounting side opening of the energy absorbing part, and at least on one side of the entire circumference of the side part. It is formed over the direction. In addition, it is preferable to form a predeformation part or a soft part in the part within 100 mm from a bumper attachment side edge part.

  In addition, as a fourth feature, based on the first and second features, after forming into the energy absorbing portion of the hollow section having the square cross section, the energy absorbing portion from the periphery that becomes the starting point of the bellows-like deformation. The soft portion having a low strength is formed in the vicinity of the opening on the bumper attachment side of the energy absorbing portion and in the lateral direction on at least one of all the side portions. In addition, it is preferable to form a soft part in the part within 100 mm from a bumper attachment side edge part.

  Therefore, the pre-deformed part or the soft part formed in the vicinity of the bumper attachment side opening part of the energy absorbing part of the energy absorbing part for automobile manufactured by the above manufacturing method and in the lateral direction on at least one surface of all side parts is Since the strength is lower than that of the surroundings, bellows-like deformation is easily induced in the energy absorbing portion by the input of collision energy. As a result, the bellows-like deformation in the energy absorbing portion is surely generated and further progresses sequentially, so that the energy absorbing portion can smoothly and reliably absorb the collision energy.

  Here, the pre-deformation part formed by unevenness with respect to the side part of the energy absorption part of the energy absorption member for automobiles is, for example, near the bumper attachment side opening part of the energy absorption part, and at least of all the side parts After the energy absorbing part is fixed in the longitudinal direction of the energy absorbing part between the jigs in the lateral direction on one side and formed by applying a compressive load, or the side part of the energy absorbing part is bent to the inner surface side by a punch. , And formed by giving a compression amount in the longitudinal direction of the energy absorbing portion.

  In addition, the soft part locally heats the energy absorbing part, which is a hollow shape, in the vicinity of the bumper attachment side opening of the energy absorbing part and across the lateral direction of at least one of all side parts. Or formed by heat when joining the energy absorbing member to the bumper by welding.

  The pre-deformation part and the soft part suffice if they are formed in the vicinity of the opening on the bumper attachment side of the energy absorption part and in the lateral direction on at least one of the side parts. In order to surely promote the occurrence of bellows-like deformation, it is desirable that it be formed over the entire circumference of the side surface portion of the energy absorbing portion.

As a fourth feature, based on the first to third features, the thickness of the energy absorbing portion is 1.3 mm or more and 10.0 mm or less, and the total transverse area of the energy absorbing portion is 3000 to 8000 mm. ² , the total cross-sectional area of the single or plural hollow portions formed in the energy absorbing portion is 45% to 95% of the total cross-sectional area of the energy absorbing portion.

  First, the wall thickness of the energy absorbing part is preferably 1.3 mm or more and 10.0 mm or less. As a result, when the collision energy is input, the energy absorbing portion generates a bellows-like deformation in the longitudinal direction of the energy absorbing portion, and further advances sequentially, so that the collision energy is absorbed and necessary. Will be able to.

  Here, if the thickness of the energy absorption part of the hollow shape material is less than 1.3 mm, the extrusion process is difficult and the strength of the energy absorption part itself becomes too low, so that it is easy to absorb energy even with a slight collision energy input. The bellows-like deformation of the part occurs, the input collision energy cannot be sufficiently absorbed, and there is a possibility of transmitting a large collision energy to the crew. Further, if the wall thickness is larger than 10.0 mm, the energy absorbing portion is too strong, and the energy absorbing portion is not sufficiently deformed at the time of a collision. As a result, the energy absorbing portion has an accordion-like shape. There is a possibility that a large collision energy may be transmitted to the occupant while absorption of the collision energy due to the deformation is insufficient.

Moreover, after making the total cross-sectional area of the said energy absorption part 3000-8000 mm < ² >, the total cross-sectional area of the single or several hollow part formed in this energy absorption part is 45% or more of the total cross-sectional area of an energy absorption part What makes it 95% or less is preferable. As a result, when the collision energy at the time of the collision is input, the bellows-like deformation occurs surely in the energy absorbing portion, and the energy absorbing portion can smoothly and reliably absorb the collision energy.

Here, if the total cross-sectional area of the energy absorbing portion is less than 3000 mm ² , the cross-sectional area of the energy absorbing portion is too small, and the absolute amount of collision energy that can be absorbed at the time of collision is low. On the other hand, if it is larger than 8000 mm ² , it is possible to smoothly and surely absorb the collision energy at the time of collision, but the volume and weight as an automobile energy absorbing member becomes extremely heavy, and it is used in a narrow space, and is lightweight. Therefore, it is not suitable for use as a part for automobiles that are desired to be manufactured.

  Further, when the total cross-sectional area of the single or plural hollow portions formed in the energy absorbing portion is less than 45% of the total cross-sectional area of the energy absorbing portion, the weight of the absorbing member itself is remarkably increased and the energy at the time of collision is increased. The collision energy cannot be smoothly and reliably absorbed due to the bellows-like deformation of the absorbing portion. If the total cross-sectional area of the hollow portion is larger than 95% of the total cross-sectional area of the energy absorbing portion, a bellows-like deformation easily occurs in the energy absorbing portion even when a slight collision energy is input, and the input collision The energy cannot be absorbed sufficiently, and there is a risk of transmitting large collision energy to the crew.

  In the present invention, in the event of a collision, even if the mounting direction of the energy absorbing member for an automobile with respect to the vehicle body and the input direction of the collision energy with respect to the bumper mounting side opening of the energy absorbing member of the absorbing member do not match, the energy absorbing member Since the bellows-like deformation is generated and the collision energy can be absorbed smoothly and reliably at the time of the collision, it has an excellent effect of ensuring the safety of the passenger.

Hereinafter, an energy absorbing member for automobiles which is an embodiment of the present invention will be described.
In addition, this Example is for demonstrating one preferable embodiment of this invention, Comprising: This invention is not restrict | limited by these.

First, reference numeral 1 in FIG. 1 is an aluminum alloy automobile energy absorbing member (hereinafter referred to as “absorbing member”) which is Embodiment 1 of the present invention, and the absorbing member 1 has vehicle body mounting side openings at both ends. In the vehicle body mounting side opening 5 of the energy absorbing portion 2 and the energy absorbing portion 2 having a rectangular shape in cross section comprising the portion 5, the bumper mounting side opening 5 ′ and the plurality of side surface portions 4 having the hollow portion 3 therein. The fixing part 6 fixed to 8 is formed integrally.
Therefore, when fixing the absorbing member 1 of the first embodiment to the vehicle body 8, the end edge 7 of the fixing portion 6 is fixed to the vehicle body while the vehicle body mounting side opening 5 of the energy absorbing portion 2 is brought into contact with the vehicle body 8. It fixes by joining to 8 integrally by welding (refer FIG. 3).

  The fixing portion 6 is difficult to weld when the material of the vehicle body 8 is iron. Therefore, when the absorbing member 1 is fixed to the vehicle body 8, the fixing portion 6 is fastened with a bolt. Therefore, the length of the fixing portion 6 (that is, the bending length of the side surface portion 4) is set to 30 mm or more so that the fixing portion 6 can be securely fastened to the vehicle body 8 with bolts, and the room is secured. Is preferred.

And the said absorption member 1 which is Example 1 of this invention is manufactured as shown in FIG.
First, an aluminum alloy hollow shape member having a square cross section having a plurality of side surfaces 4 is hot-extruded and cut into a predetermined length, and both vehicle body attachment side openings 5 and bumper attachment side openings 5 ' The energy absorbing portion 2 that is a hollow shape member having a square cross section formed by a plurality of side surface portions 4 is formed.
Thereafter, the energy absorbing portion 2 formed into the hollow shape material is tempered by T6 treatment [see FIG. 2 (A)].
Furthermore, with respect to the corner 9 formed by the edge 4 'of each side surface 4 in the one vehicle body attachment side opening 5 of the tempered energy absorbing portion 2, the length is equal in the longitudinal direction of the energy absorbing portion. The slit 10 is disposed [see FIG. 2 (b)].
Then, it is bent so that a part of each side surface portion 4 corresponding to the space between the slits 10 is expanded (see FIG. 2C).
As a result, the absorbing member 1 is formed by integrally forming the energy absorbing portion 2 having the hollow portion 3 and the fixing portion 6 fixed to the vehicle body 8 at the vehicle body mounting side opening 5 of the energy absorbing portion 2. Is manufactured [see FIG. 2 (d)].

Moreover, in the energy absorption part 2 of the said absorption member 1 of Example 1 in this invention, the starting point so that this energy absorption part 2 will generate | occur | produce the bellows-like deformation 13 rapidly by the input of the collision energy at the time of a collision. The pre-deformation part 11 formed with unevenness with respect to the side part 4 and the soft parts 12 and 17 having lower strength than the surroundings are at least of all the side parts 4 in the vicinity of the bumper mounting side opening part 5 'of the energy absorption part 2 On one side, it may be preferably arranged over the entire circumference (see FIGS. 11 (A), (B) and (C)).
Here, the pre-deformation part 11 is formed by holding the energy absorbing part 2 in the longitudinal direction of the energy absorbing part between the jigs and applying a compressive load, or the side part 4 of the energy absorbing part 2 is punched. After bending to the inner surface side, the energy absorbing portion 2 is formed by applying a compression amount in the longitudinal direction.
Further, the soft portions 12 and 17 are heated locally by heating the energy absorbing portion 2 or by heat when joining the energy absorbing member 1 and the bumper 16 with the welded portion 18 by welding. Is formed so as to have a low strength.
As a result, due to the input of collision energy to the energy absorption unit 2, the pre-deformation part 11 or the soft parts 12 and 17 of the energy absorption part 2 have a low strength, and thus easily deformed in the longitudinal direction of the energy absorption part, A certain bellows-like deformation 13 in the energy absorbing portion 2 is generated.

  As described above, since the absorbing member 1 according to the first embodiment of the present invention is configured, in the event of a collision, the mounting direction of the absorbing member 1 with respect to the vehicle body 8 and the bumper mounting side opening of the energy absorbing portion 2 of the absorbing member 1 When the input direction of the collision energy to the part 5 ′ coincides, the energy absorption part 2 receives the collision energy input to the bumper attachment side opening 5 ′ of the energy absorption part 2 in the longitudinal direction of the energy absorption part. . As a result, the energy absorbing portion 2 generates a bellows-like deformation 13, and further, the bellows-like deformation 13 sequentially proceeds in the longitudinal direction of the energy absorbing portion according to the magnitude of the collision energy. Can absorb the collision energy smoothly and reliably (see FIGS. 4A and 4B).

  On the other hand, the absorbing member 1 according to the first embodiment of the present invention is attached to the vehicle body 8 at an angle, or the colliding opponent collides at an angle. That is, at the time of the collision, the absorbing member 1 is attached to the vehicle body 8. Even if the direction and the input direction of the collision energy to the bumper mounting side opening 5 ′ of the energy absorbing portion 2 of the absorbing member 1 do not coincide with each other, the energy absorbing portion that integrally forms the fixing portion 6 fixed to the vehicle body 8 Since no soft part due to heat during welding is formed in the vicinity of the vehicle body attachment side opening 5 of FIG. 2, the energy absorbing part 2 is not bent and deformed by the input of collision energy. As a result, the energy absorbing portion 2 generates a bellows-like deformation 13, and further, the bellows-like deformation 13 sequentially proceeds in the longitudinal direction of the energy absorbing portion according to the magnitude of the collision energy. The collision energy can be absorbed smoothly and reliably.

Next, FIG. 5 shows an aluminum alloy automobile energy absorbing member (hereinafter referred to as “absorbing member”) 1 which is a second embodiment of the present invention. The member 1 includes an energy absorbing portion 2 having a square cross section composed of a plurality of side portions 4 each having a hollow portion 3 therein, and a fixing portion 6 that is fixed to the vehicle body 8 at the vehicle body mounting side opening 5 of the energy absorbing portion 2. Common in that they are integrally formed. In addition, in the energy absorption part 2, the partition wall 14 that integrally connects the inner wall surfaces 4 a of the opposing side surface parts 4 is disposed, so that the hollow part 3 having the same shape is arranged in the longitudinal direction of the energy absorption part. In contrast, two are formed.
Therefore, when the absorbing member 1 of the second embodiment is fixed to the vehicle body 8, as in the first embodiment, the vehicle body mounting side opening 5 of the energy absorbing portion 2 is brought into contact with the vehicle body 8 while the fixing portion 6 is fixed integrally to the vehicle body 8 by welding (see FIG. 7).

  As in the first embodiment, the fixing portion 6 of the absorbing member 1 is fixed to the length of the fixing portion 6 (that is, the side portion is bent) so that the bolt can be securely fastened according to the material of the vehicle body 8. It is preferable to secure the room by setting the length to 30 mm or more.

And the said absorption member which is Example 2 of this invention is manufactured as shown in FIG.
First, an aluminum alloy hollow shape member having a square cross section in which partition walls 14 that form a hollow portion 3 having the same shape by integrally connecting a plurality of side surface portions 4 and opposing inner wall surfaces 4a of the side surface portions 4 are heated. It is a hollow section having a square cross-sectional shape formed by inter-extrusion, cutting to a predetermined length, and comprising a vehicle body mounting side opening 5 at both ends, a bumper mounting side opening 5 ′, a plurality of side surfaces 4 and a partition wall 14. A certain energy absorbing portion 2 is formed.
Thereafter, the energy absorbing unit 2 is subjected to tempering by T6 treatment (see FIG. 6A).
Further, energy is applied at the corner portion 9 formed by the edge of each side surface portion 4 and the inner wall surface 4a of the side surface portion 4 and the partition wall 14 in the vehicle body attachment side opening 5 of the tempered energy absorbing portion 2. An equal-length slit 10 is disposed in the longitudinal direction of the absorption part [see FIG. 6 (B)].
Then, the side walls 4 corresponding to the gaps between the slits 10 are bent so as to expand, and the partition 14 corresponding to the length of the slits 9 is removed by cutting [FIG. See c).
As a result, the absorption formed by integrally forming the energy absorbing portion 2 having the plurality of hollow portions 3 described above and the fixing portion 6 fixed to the vehicle body 8 at the vehicle body attachment side opening 5 of the energy absorbing portion 2. The member 1 is manufactured [see FIG. 6 (D)].

  In addition, also in the said absorption member 1 of Example 2, it becomes the starting point so that this energy absorption part 2 can perform the bellows-like deformation 13 rapidly by the input of the collision energy at the time of a collision similarly to Example 1. At least one surface of at least one of the side surface parts 4 in the vicinity of the bumper mounting side opening 5 ′ of the energy absorbing part 2, the pre-deformed part 11 formed with unevenness with respect to the side part 4 and the soft parts 12 and 17 having lower strength than the surroundings. Alternatively, it may be arranged over the entire circumference (see FIGS. 11A, 11B and 11C).

  As described above, since the absorbing member 1 according to the second embodiment of the present invention is configured, at the time of a collision, the mounting direction of the absorbing member 1 with respect to the vehicle body 8 and the bumper mounting side opening of the energy absorbing portion 2 of the absorbing member 1 When the input direction of the collision energy with respect to the part 5 ′ matches, the energy absorption part 2 receives the collision energy input to the bumper attachment side opening 5 ′ of the energy absorption part 2 in the longitudinal direction of the energy absorption part. is there. As a result, the energy absorbing portion 2 alternately generates bellows-like deformations 13 with the partition walls 14 forming the hollow portions 3 therein as boundaries, and the bellows-like deformations 13 are generated according to the magnitude of the collision energy. Since the energy absorption unit 2 sequentially proceeds in the longitudinal direction, the energy absorption unit 2 can absorb the collision energy smoothly and reliably [see FIGS. 8 (A) and 8 (B)].

  In addition, the absorbing member 1 according to the second embodiment of the present invention is attached to the vehicle body 8 at an angle, or the colliding opponent collides at an angle, that is, the attachment direction of the absorbing member 1 to the vehicle body 8 at the time of the collision. And the energy absorbing part 2 that integrally forms the fixing part 6 fixed to the vehicle body 8 even when the input direction of the collision energy to the bumper mounting side opening 5 'of the energy absorbing part 2 of the absorbing member 1 does not match. In the vicinity of the vehicle body mounting side opening 5, no soft part is formed by heat during welding, so that the energy absorbing part 2 is not bent and deformed by collision energy. As a result, bellows-like deformations 13 are alternately generated with the partition wall 12 in the energy absorption unit 2 as a boundary, and further, the bellows-like deformations 13 are sequentially moved in the longitudinal direction of the energy absorption unit according to the magnitude of the collision energy. Since it proceeds, the collision energy can be absorbed smoothly and reliably.

Then, the energy absorption member 1 for automobiles of Example 1 in the present invention was manufactured and the effect was confirmed.
First, as a test material, in the energy absorption part 2, what does not have the predeformation part 11 and what has the predeformation part 11 decided to use. Here, the aluminum alloy used as a raw material contains Si: 0.45 mass%, Fe: 0.20 mass%, Mn: 0.04 mass%, Mg: 0.65 mass%, and consists of the balance Al. . Then, the aluminum alloy is formed by using an aluminum alloy extruded billet and cutting the energy absorbing portion 2 which is a hollow shape member having an outer dimension of 100 × 60 mm and a wall thickness of 3.5 mm to a predetermined dimension after extrusion. did.
Thereafter, the energy absorbing portion 2 was tempered by T6 treatment.
At the same time, the energy absorbing part 2 subjected to the T6 treatment is held in the longitudinal direction of the energy absorbing part between the jigs to give a compression amount of 10 mm. An uneven pre-deformed portion 11 having a depth of 10 mm was formed over the entire circumference of the side surface portion 4 in the vicinity of the bumper mounting side opening 5 ′.
Further, the energy absorbing part 2 having no pre-deformed part 11 and the energy absorbing part 2 having the pre-deformed part 11 are each cut into 450 mm.
Then, the corner portion 9 formed by the edge 4 'of the side surface portion 4 is cut in the vehicle body mounting side opening 5 of each energy absorbing portion 2 so that a slit having a total length of 50 mm is formed in the longitudinal direction of the energy absorbing portion. In addition to being disposed, the side portions 4 corresponding to the slits were bent so as to expand, and the fixing portion 6 was integrally formed.
In the test materials 1 manufactured as described above (without the predeformed portion 11) and 2 (with the predeformed portion 11), the fixing portion 6 and the aluminum alloy plate imitating the vehicle body 8 were integrally fixed by welding.
On the other hand, the comparative materials 1 and 2 are obtained by cutting the energy absorbing portion 2 in the test materials 1 and 2 into 400 mm each having no pre-deformation portion 11 and one having the pre-deformation portion 11. . That is, the comparative material 1 does not have the predeformed portion 11, and the comparative material 2 has the predeformed portion 11. And the said comparative materials 1 and 2 each fixed to the vehicle body attachment side opening part 5 of the energy absorption part 2, and the aluminum alloy plate imitating the vehicle body 8 by fillet welding over the perimeter.

Both the above test materials 1 and 2 and the comparative materials 1 and 2 corresponding to them were subjected to a static axial compression test using an Instron universal testing machine at a test speed of 1 mm / s. Here, in the test materials 1 and 2 and the comparative materials 1 and 2, the angles of the test machine base and the pressure plate were adjusted so that the longitudinal direction of the energy absorbing portion and the compression direction make an angle of 10 °. Further, in the testing machine base, the aluminum alloy plate in which the test materials 1 and 2 and the comparative materials 1 and 2 are fixed by welding is fixed to the base with bolts (as a result, the absorber 1 is attached to the vehicle body 8 in the event of a collision). This corresponds to a case where the mounting direction and the input direction of the collision energy with respect to the bumper mounting side opening 5 ′ of the energy absorbing portion 2 of the absorbing member 1 do not match. In addition, on the pressure platen side of the testing machine, a fixing jig was prepared so that no slip would occur between the pressure platen, the test materials 1 and 2 and the bumper attachment side opening 5 ′ of the comparative materials 1 and 2. Therefore, a compressive load was applied by the pressure plate, and a load-displacement diagram relating to the pressure plate was recorded (see FIG. 10 (a) No pre-deformed portion (b) Pre-deformed portion present).
In addition, the same result will be obtained even if what kind of testing machine is used if the testing machine to be used can apply a compressive load.
From the above experiment, the test materials 1 and 2 which are embodiments of the invention of the present application, regardless of the presence or absence of the pre-deformation portion 11, are located near the bumper attachment side opening 5 ′ on the pressure platen side from the start of the test to the end of the test. Since the bellows-like deformation 13 is stably generated from the concavo-convex pre-deformation portion 11 and further progressed sequentially, it was confirmed that the collision energy can be absorbed smoothly and reliably [FIG. ) And (b) (see solid line). On the other hand, the comparative materials 1 and 2 did not generate any bellows-like deformation after the start of the test, or immediately after the start of the test, the bellows-like deformation occurred from the uneven pre-deformation part 11 near the opening on the pressure platen side. However, it was confirmed that bending deformation occurred soon in the energy absorbing portion 2 and that the collision energy could not be absorbed smoothly and reliably (see dotted lines in FIGS. 10A and 10B).

  Since the energy absorbing member for automobiles of the present invention can form the collision energy at the time of collision accurately and absorb the collision energy smoothly and reliably, not only the automobile but also the internal objects can be taken into account. It can be applied to anything that needs to be protected.

It is a whole perspective view of the energy absorption member for motor vehicles of Example 1 of this invention. It is a schematic diagram of the manufacturing process of the energy absorption member for motor vehicles of Example 1 of this invention. It is a whole perspective view at the time of the vehicle body attachment of the energy absorption member for motor vehicles of Example 1 of this invention. It is a figure which shows the deformation | transformation state of the energy absorption member for motor vehicles of Example 1 of this invention. It is a whole perspective view of the energy absorption member for motor vehicles of Example 2 of this invention. It is a schematic diagram of the manufacturing process of the energy absorption member for motor vehicles of Example 2 of this invention. It is a whole perspective view at the time of the vehicle body attachment of the energy absorption member for motor vehicles of Example 2 of this invention. It is a figure which shows the deformation | transformation state of the energy absorption member for motor vehicles of Example 2 of this invention. The cross-sectional shape in the modification of the energy absorption member for motor vehicles in this invention is shown. It is the figure which showed the result of the effect confirmation test of the energy absorption member for motor vehicles of Example 1 in this invention, (A) is a case without a predeformation part and (B) the case with a predeformation part. It is a front view at the time of forming (i) predeformation part and (b), (c) soft part with respect to the energy absorption member for motor vehicles in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Automobile energy absorption member 2 Energy absorption part 3 Hollow part 4 Side part 4 'End edge 4a Inner wall surface 5 Car body attachment side opening part 5' Bumper attachment side opening part 6 Fixing part 7 Edge 8 Car body 9 Corner | angular part 10 Slit 11 Preliminary Deformation part 12 Soft part 13 Bellows-like deformation 14 Bulkhead
15 Connecting part 16 Bumper 17 Soft part 18 Welded part

Claims (6)

After forming an aluminum alloy into an energy absorbing portion, which is a hollow section having a square cross-sectional shape composed of an opening at both ends and a plurality of side portions to be a vehicle body attachment side opening and a bumper attachment side opening by extrusion. ,
Tempering,
Furthermore, after arranging slits of equal length in the longitudinal direction of the energy absorbing unit, with respect to the corners formed from the side edges of the energy absorbing unit on the vehicle body mounting side opening,
By bending so as to expand a part of each side surface corresponding to each of the slits,
A method for manufacturing an energy absorbing member for an automobile, comprising: an energy absorbing portion having a hollow portion; and a fixing portion that is fixed to a vehicle body at an opening on a vehicle body attachment side of the energy absorbing portion. An aluminum alloy is extruded to form a body mounting side opening and a bumper mounting side opening, and has a square cross-sectional shape composed of openings at both ends and a plurality of side surfaces, and at least the inner wall surfaces of the side surfaces facing each other Or after forming into an energy absorbing part which is a hollow shape member integrally connecting the corners on the diagonal line of the square cross section with a partition wall,
Tempering,
Furthermore, a slit having an equal length in the longitudinal direction of the energy absorbing portion is provided for the corner portion formed by each side portion edge at the vehicle body mounting side opening of the energy absorbing portion and the connecting portion between the side portion and the partition wall. Above,
Bend so that a part of each side part corresponding to between each slit is expanded,
In addition, by cutting the partition wall corresponding to the length of the slit by cutting,
An automobile, characterized in that an energy absorbing portion having a hollow portion divided into a plurality of partitions by a partition wall and a fixing portion fixed to the vehicle body are integrally formed at a vehicle body mounting side opening of the energy absorbing portion. Manufacturing method of energy absorbing member. After forming into the energy absorbing portion of the hollow section having the square cross section, a pre-deformed portion formed with irregularities with respect to the side surface that is the starting point of the bellows-like deformation is formed on the energy absorbing portion. The method for manufacturing an automobile energy absorbing member according to claim 1, wherein the method is formed in a lateral direction in at least one of all side surface portions in the vicinity of the portion. After forming into the energy absorbing portion of the hollow section having a square cross section, the soft portion which is the starting point of the energy absorbing portion bellows-like deformation is in the vicinity of the bumper mounting side opening of the energy absorbing portion, and all side portions The method for manufacturing an energy absorbing member for an automobile according to claim 1, wherein the method is formed in a lateral direction on at least one surface. The thickness of the energy absorbing part is 1.3 mm or more and 10.0 mm or less, and the total cross-sectional area of the energy absorbing part is set to 3000 to 8000 mm ^2, and one or more formed in the energy absorbing part The method for producing an energy absorbing member for an aluminum alloy automobile according to any one of claims 1 to 3, wherein the total cross-sectional area of the hollow portion is 45% to 95% of the total cross-sectional area of the energy absorbing portion. An automobile energy absorbing member produced by the method for producing an automobile energy absorbing member according to any one of claims 1 to 4.

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