JP5357786B2 - Aluminum alloy extrusions for structural members - Google Patents

Aluminum alloy extrusions for structural members Download PDF

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JP5357786B2
JP5357786B2 JP2010006092A JP2010006092A JP5357786B2 JP 5357786 B2 JP5357786 B2 JP 5357786B2 JP 2010006092 A JP2010006092 A JP 2010006092A JP 2010006092 A JP2010006092 A JP 2010006092A JP 5357786 B2 JP5357786 B2 JP 5357786B2
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aluminum alloy
alloy extruded
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closed cross
section
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JP2011143815A (en
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正敏 吉田
寿人 ▲高▼内
伊藤  誠
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Toyota Boshoku Corp
Kobe Steel Ltd
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Kobe Steel Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an aluminum alloy extruded shape that is, even when a bending load and a torsional moment with the fulcrum at one end and an application point of force at the other end are applied while in use as a structural member supported or jointed at both ends, less likely to be subjected to a break or a buckling distortion at the one end side being the fulcrum, so as to exhibit a high distortion strength. <P>SOLUTION: The aluminum alloy extruded shape 1, onto which the bending load and the torsional moment are loaded while in use, is made of a high-strength aluminum alloy. and includes a closed cross-sectional portion 8, and a flat protruded flange portion 6 projected from a wall that constitutes this closed cross-sectional portion 8 in the direction toward the outside of bending when the bending moment is applied. This protruded flange portion 6 is protruded from any portion of the wall near the outside and formed into a shape with a width of this protruded flange portion 6 varying from a narrow width to a wide width, so as to enhance the distortion strength. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は構造部材用アルミニウム合金押出形材に関するものである。以下、アルミニウム合金押出形材を単に押出形材とも言う。   The present invention relates to an aluminum alloy extruded shape for a structural member. Hereinafter, the aluminum alloy extruded profile is also simply referred to as an extruded profile.

周知の通り、自動車や種々の車両などの車体のフレーム類、メンバー類、補強材などの構造部材、あるいは車内の種々の構造部材(部品)には、比較的高強度な鋼材やアルミニウム合金材が使用されている。   As is well known, relatively high-strength steel and aluminum alloy materials are used for structural members such as frames, members, reinforcements, etc. of automobiles and various vehicles, or various structural members (parts) in vehicles. It is used.

特に、自動車や種々の車両などの場合、事故による車体衝突の問題があり、この衝突時に強い衝撃荷重が加わる前記構造部材には、単なる高強度化だけではなく、前記衝撃荷重に対して破断や座屈変形しないような高い変形強度が求められる。   In particular, in the case of automobiles and various vehicles, there is a problem of a vehicle body collision due to an accident, and the structural member to which a strong impact load is applied at the time of the collision is not only increased in strength but also broken or broken against the impact load. A high deformation strength that does not cause buckling deformation is required.

このような構造部材用途には、従来から高張力鋼板の加工品や成形品が用いられるが、近年では、車体の軽量化の観点から、構造部材自体を軽量化することも望まれている。このため、高い変形強度が求められる構造部材用途にも、これら高張力鋼板に替えて、アルミニウム合金材の適用が検討あるいは実用化されてきている。   For such structural member applications, processed products and molded products of high-tensile steel sheets are conventionally used. However, in recent years, it is also desired to reduce the weight of the structural member itself from the viewpoint of reducing the weight of the vehicle body. For this reason, the application of an aluminum alloy material has been studied or put into practical use in place of these high-tensile steel sheets for structural member applications that require high deformation strength.

特に、アルミニウム合金押出形材は、アルミニウム合金板を用いる場合のような、鋼板並の難しい成形を必要とせず、その断面形状が長手方向に(押出方向に)一様な、押出形材の特徴を生かせる断面形状を有する構造部材に有利に適用できる。例えば、アルミニウム合金押出形材を中空構造であるような閉断面構造とすれば、成形や溶接によって断面がHAT型などの同じ中空構造としている鋼板製の構造部材に、そのまま代えることができる。また、アルミニウム合金押出形材を中空構造であるような閉断面構造とすれば、ソリッドな開断面構造のアルミニウム合金押出形材に比して、前記変形強度も大きくできる。   In particular, the extruded shape of an aluminum alloy does not require difficult forming as in the case of using an aluminum alloy plate, and the cross-sectional shape is uniform in the longitudinal direction (extrusion direction). The present invention can be advantageously applied to a structural member having a cross-sectional shape that makes the best use of. For example, if the aluminum alloy extruded profile has a closed cross-sectional structure having a hollow structure, it can be directly replaced by a steel plate structural member having the same hollow structure such as a HAT type by forming or welding. Further, if the aluminum alloy extruded shape has a closed cross-sectional structure having a hollow structure, the deformation strength can be increased as compared with the aluminum alloy extruded shape having a solid open cross-sectional structure.

このため、このような閉断面構造を有する押出形材は、車体構造部材として、例えば、自動車のクロスメンバー(特許文献1参照)、自動車のサイドドア用のインパクトビーム(特許文献2参照)、自動車のルーフ補強材(特許文献3参照)などが、近年では多数検討あるいは実用化されている。   For this reason, an extruded profile having such a closed cross-sectional structure is used as a vehicle body structural member, for example, an automobile cross member (see Patent Document 1), an impact beam for an automobile side door (see Patent Document 2), an automobile, and the like. In recent years, many roof reinforcing materials (see Patent Document 3) have been studied or put into practical use.

これらの押出形材製の車体の構造部材は、断面が矩形な中空構造である閉断面構造を有するとともに、共通して、前記変形強度を大きくするために、閉断面構造から側方に張出した突出フランジ部を有している。このような閉断面構造と突出フランジ部との組み合わせは、押出形材製の自動車のバンパ補強材など、他の車体の構造部材としても、周知である。   These structural members of the extruded vehicle body have a closed cross-sectional structure that is a hollow structure with a rectangular cross section, and in common, are extended laterally from the closed cross-sectional structure in order to increase the deformation strength. It has a protruding flange. Such a combination of a closed cross-sectional structure and a protruding flange portion is well known as a structural member of another vehicle body such as an automobile bumper reinforcement made of an extruded profile.

特開2006−240543号公報JP 2006-240543 A 特開2008−285019号公報JP 2008-285019 A 特開2009−35244号公報JP 2009-35244 A

ただ、これらアルミニウム合金押出形材製の車体の構造部材の共通する特徴は、押出材である必然性から、構造部材の断面形状が長手方向に(押出方向に)一様となる点である。このような車体の構造部材は、両端を支持あるいは接合された構造部材としての使用中に、前記閉断面構造である押出形材の長手方向や幅方向に大きな衝撃荷重が加わる場合には高い変形強度を示す。   However, a common feature of the structural members of the vehicle body made of these aluminum alloy extruded shapes is that the cross-sectional shape of the structural members is uniform in the longitudinal direction (in the extrusion direction) because it is necessarily an extruded material. Such a structural member of a vehicle body is highly deformed when a large impact load is applied in the longitudinal direction or the width direction of the extruded profile having the closed cross-section structure during use as a structural member in which both ends are supported or joined. Indicates strength.

しかし、両端を支持あるいは接合された長尺の構造部材では、前記自動車の車体衝突など、この構造部材が組み込まれている車体や構造物自体への衝撃荷重の負荷のされ方によっては、前記長尺の構造部材であるアルミニウム合金押出形材の長手方向の一端側に曲げ荷重が負荷される場合がある。   However, in the case of a long structural member that is supported or joined at both ends, depending on how an impact load is applied to the vehicle body or the structure itself in which the structural member is incorporated, such as a vehicle body collision of the automobile, There is a case where a bending load is applied to one end side in the longitudinal direction of an aluminum alloy extruded profile which is a long structural member.

このように、一端を支点とし、他端を作用点とする大きな衝撃荷重が加わる場合に、断面形状が長手方向に(押出方向に)一様な長尺のアルミニウム合金押出形材では、特に前記支点となる一端側での変形強度が不足しやすく、この部分で、破断や座屈変形が生じやすいという問題がある。逆に支点側で十分な変形強度を確保できる断面形状にした場合には、応力が小さい作用点側の断面が過剰設計になり、重量増加が問題になることになる。   In this way, when a large impact load is applied with one end as a fulcrum and the other end as an action point, the long aluminum alloy extruded shape with a uniform cross-sectional shape in the longitudinal direction (in the extrusion direction) There is a problem in that the deformation strength on one end side serving as a fulcrum tends to be insufficient, and breakage or buckling deformation tends to occur at this portion. On the other hand, when the cross-sectional shape is such that sufficient deformation strength can be ensured on the fulcrum side, the cross-section on the side of the action point where the stress is small becomes excessively designed, resulting in an increase in weight.

さらには,曲げ荷重の作用する位置や方向によっては、形材長手方向にねじりモーメントが発生する。たとえば,作用点に取り付けられた他部品を介して荷重が伝わる場合や、構造部品を構成する断面の一部に荷重が加わるような場合は、ねじりモーメントが発生し、このねじりモーメントに対して十分なねじり剛性を持たない部品の場合、ねじりモーメントに起因する変形荷重の低下や、変形量の増大が生じる。つまり、このようなねじりモーメントに対応できる十分なねじり剛性を確保することも重要である。   Furthermore, a torsional moment is generated in the longitudinal direction of the shape depending on the position and direction of the bending load. For example, a torsional moment is generated when a load is transmitted through another part attached to the point of application, or when a load is applied to a part of the cross section constituting a structural part. In the case of a component that does not have sufficient torsional rigidity, the deformation load is reduced and the deformation amount is increased due to the torsional moment. That is, it is also important to ensure sufficient torsional rigidity that can cope with such a torsional moment.

したがって、本発明の目的は、両端を支持あるいは接合された構造部材としての使用中に、前記一端を支点とし、他端を作用点としたような曲げ荷重およびねじりモーメントが負荷されても、前記支点となる一端側で、破断や座屈変形しにくく、高い変形強度を示すアルミニウム合金押出形材を提供することである。   Therefore, the object of the present invention is to use the above-mentioned one end as a fulcrum and the other end as a working point during use as a structural member that is supported or joined at both ends. The object is to provide an aluminum alloy extruded shape which is not easily broken or buckled and has a high deformation strength at one end serving as a fulcrum.

上記目的を達成するための本発明の、変形強度が高い構造部材用アルミニウム合金押出形材の要旨は、構造部材としての使用中に長手方向の一端に曲げ荷重とねじりモーメントとが負荷されるアルミニウム合金押出形材であって、0.2%耐力が300MPa以上であり、かつ、全長に亙って断面形状が同じである長尺の閉断面部と、この閉断面部を構成するひとつの壁から前記閉断面部の全長に亙って前記曲げ荷重作用時に曲げ外側となる方向に張り出した平坦な突出フランジとからなり、この突出フランジの幅が、前記閉断面部の前記作用点となる一端側から前記支点となる他端側に向かって、狭幅から広幅になるように連続的に変化する形状を有したことである。   In order to achieve the above object, the gist of the extruded aluminum alloy for structural members having high deformation strength according to the present invention is aluminum in which bending load and torsional moment are applied to one end in the longitudinal direction during use as a structural member. An elongated extruded section having a 0.2% proof stress of 300 MPa or more and the same cross-sectional shape over the entire length, and one wall constituting the closed section A flat projecting flange projecting in the direction of bending outward when the bending load is applied over the entire length of the closed section, and the width of the projecting flange is one end serving as the action point of the closed section. From the side to the other end side as the fulcrum, it has a shape that continuously changes from narrow to wide.

ここで、前記アルミニウム合金押出形材の突出フランジ部の一方の面が、前記閉断面部を構成する一つの壁の外壁面と面一であることが好ましい。また、前記アルミニウム合金押出形材の閉断面部が4つの壁で形成された矩形断面形状を有したことが好ましい。また、前記アルミニウム合金押出形材の閉断面部を構成し、前記曲げ荷重作用時に曲げ内側に位置する壁の少なくとも一部が、前記閉断面部を構成する他の壁の厚みに比べて、厚肉であることが好ましい。また、前記アルミニウム合金押出形材の突出フランジ部の端部の少なくとも一部が、その長手方向に亙って一方向に折り曲げられていることが好ましい。   Here, it is preferable that one surface of the protruding flange portion of the aluminum alloy extruded profile is flush with the outer wall surface of one wall constituting the closed cross-sectional portion. Moreover, it is preferable that the closed cross-section part of the said aluminum alloy extruded shape material had the rectangular cross-sectional shape formed with four walls. Further, the closed section of the aluminum alloy extruded profile is configured, and at least a part of the wall located inside the bend when the bending load is applied is thicker than the thickness of the other walls configuring the closed section. It is preferably meat. Moreover, it is preferable that at least a part of the end portion of the protruding flange portion of the aluminum alloy extruded shape member is bent in one direction over the longitudinal direction.

また、前記アルミニウム合金押出形材が、素材アルミニウム合金押出形材を二分して得られたものであり、この素材アルミニウム合金押出形材は、全長に亙って断面形状が同じである2本の平行な長尺の閉断面部と、これら閉断面部間に介在してこれら閉断面部同士を互いにつなぐ平坦なフランジ部とからなり、このフランジを長手方向に亙って斜めに切断することによって突出フランジを形成したものであり、この素材アルミニウム合金押出形材を平面視した場合に互いの形状が点対称になるように二分したものであることが好ましい。また、前記アルミニウム合金押出形材の閉断面部のうち、最も薄い壁の厚みが1.8mm〜3mmの範囲であることが好ましい。   The aluminum alloy extruded profile is obtained by bisecting the material aluminum alloy extruded profile, and the material aluminum alloy extruded profile has two cross-sectional shapes that are the same over the entire length. It consists of a parallel long closed cross-section portion and a flat flange portion that is interposed between these closed cross-section portions and connects the closed cross-section portions to each other, and this flange is cut obliquely over the longitudinal direction. A protruding flange is formed, and it is preferable that the aluminum alloy extruded profile is bisected so that the shapes thereof are point-symmetric when viewed in plan. Moreover, it is preferable that the thickness of the thinnest wall is the range of 1.8 mm-3 mm among the closed cross-section parts of the said aluminum alloy extrusion shape material.

ここで、前記した長尺のアルミニウム合金押出形材とは、その幅方向の長さ(幅、横断面方向の長さ)に対して、前記した長手方向の識別が一見して(容易に)できるに十分な、長手方向の長さを有するアルミニウム合金押出形材のことである。   Here, the above-mentioned long aluminum alloy extruded shape is at first glance (easily) identified with respect to the length in the width direction (width, length in the cross-sectional direction). It is an aluminum alloy extruded profile having a longitudinal length that is sufficient to be possible.

前記した、長手方向の一端に曲げ荷重およびねじりモーメントが加わる場合、図1に示すように、多くの場合、構造部材としてのアルミニウム合金押出形材1の長手方向の一端を支点とし、他端を作用点として負荷される。この場合、図1に示すアルミニウム合金押出形材1の上端1aに負荷される曲げ荷重P1により発生する曲げモーメントM1は、その下端1bで最大になる。このため、効率的に、このアルミニウム合金押出形材1の変形強度を高めるためには、下端1bほど曲げ強度が高くなるように、断面の荷重方向高さを大きく設計する必要がある。   When a bending load and a torsional moment are applied to one end in the longitudinal direction as described above, as shown in FIG. 1, in many cases, one end in the longitudinal direction of the aluminum alloy extruded profile 1 as a structural member is used as a fulcrum, and the other end is used as a fulcrum. Loaded as an action point. In this case, the bending moment M1 generated by the bending load P1 applied to the upper end 1a of the aluminum alloy extruded profile 1 shown in FIG. 1 becomes maximum at the lower end 1b. For this reason, in order to increase the deformation strength of the aluminum alloy extruded shape 1 efficiently, it is necessary to design the height in the load direction of the cross section so that the bending strength becomes higher at the lower end 1b.

押出形材の長手方向の一端に(押出形材の一端を支点とし、他端を作用点として)負荷される曲げ荷重に対応して、前記曲げ荷重作用時に曲げ外側となる方向側には引張荷重のみが、曲げ内側になる部分には圧縮応力のみが加わることを知見した。また、一般的な構造部品の場合、曲げ荷重に起因する曲げモーメントよりもねじりモーメントの影響が小さいため、ねじりモーメントが負荷されても、この傾向には大きな差異は無いことも知見した。   Corresponding to the bending load applied to one end in the longitudinal direction of the extruded profile (one end of the extruded profile is the fulcrum and the other is the working point), the direction that becomes the outside of the bending when the bending load is applied is pulled It was found that only the compressive stress is applied to the portion where only the load becomes inside the bend. Moreover, in the case of general structural parts, since the influence of the torsional moment is smaller than the bending moment caused by the bending load, it was also found that there is no significant difference in this tendency even when the torsional moment is applied.

つまり、負荷される曲げ荷重に応じて、断面内には、前記引張荷重側と前記圧縮応力側になる部分があり、所定の変形強度を得るための最適な断面形状が各々異なることを意味している。   In other words, depending on the applied bending load, there are portions in the cross section that become the tensile load side and the compressive stress side, and the optimum cross-sectional shape for obtaining a predetermined deformation strength is different. ing.

このため、本発明では、前記した状態で曲げ荷重とねじりモーメントが負荷される構造部材において、特に前記引張荷重のみが加わる側には、軽量化および後述する加工性のために、前記閉断面部8をあえて構成(配置)せずに、図1の押出形材1のように突出フランジ部6のみを配置している。   For this reason, in the present invention, in the structural member to which a bending load and a torsional moment are applied in the above-described state, particularly on the side to which only the tensile load is applied, the closed cross-section portion is provided for weight reduction and workability described later. 8 is not intentionally configured (arranged), but only the protruding flange portion 6 is arranged as in the extruded profile 1 of FIG.

ただし、構造部材1の長手方向(図1の上下方向)で、この突出フランジ部6の幅が同じで、この突出フランジ部6の断面形状が長手方向に一様であれば、前記したように、突出フランジ部6の下端6b側での変形強度が不足するか、もしくは、作用点側が過剰設計になり、重量増加を招くことになる。   However, if the protruding flange portion 6 has the same width in the longitudinal direction of the structural member 1 (vertical direction in FIG. 1) and the sectional shape of the protruding flange portion 6 is uniform in the longitudinal direction, as described above. The deformation strength on the lower end 6b side of the projecting flange portion 6 is insufficient, or the working point side is overdesigned, resulting in an increase in weight.

このため、本発明では、この突出フランジ部6の幅を、前記閉断面部8の作用点となる一端1a側から前記支点となる他端1b側に向かって、狭幅から広幅になるように連続的に変化させる。即ち、突出フランジ部6の幅を、上端6a側に比べて、下端6b側ほど大きくして、この下端6b側ほど荷重方向の断面幅が増大するようにして、曲げ変形強度を高くしている。   For this reason, in the present invention, the width of the projecting flange portion 6 is changed from a narrow width to a wide width from the one end 1a side serving as the action point of the closed cross section 8 toward the other end 1b side serving as the fulcrum. Change continuously. That is, the width of the projecting flange portion 6 is increased toward the lower end 6b side as compared with the upper end 6a side, and the sectional width in the load direction is increased toward the lower end 6b side to increase the bending deformation strength. .

この一方で、本発明では、前記した状態で曲げ荷重とねじりモーメントが負荷される構造部材において、特に前記曲げ荷重に起因する圧縮応力が加わる側には、中空構造である閉断面部分を構成(配置)する。最も高い圧縮応力が加わる支点側の曲げ内側に,開断面構造ではなく閉断面部を配置することで、座屈強度が向上し、変形強度を向上することが可能になる。
そして、この閉断面構造はフレームの長手方向に亙って(長手方向の全面に亙って)設けることも特徴としている。ねじりモーメントは、部品長手方向全体にわたって加わるため、ねじり剛性の高い閉断面構造を長手方向全面に渡って設けることで、変形強度を顕著に向上することができることになる。
On the other hand, in the present invention, in the structural member to which a bending load and a torsional moment are applied in the above-described state, a closed cross-section portion having a hollow structure is formed particularly on the side to which the compressive stress caused by the bending load is applied ( Deploy. By arranging a closed cross-section portion instead of an open cross-section structure inside the bending side on the fulcrum side to which the highest compressive stress is applied, the buckling strength can be improved and the deformation strength can be improved.
The closed cross-sectional structure is characterized in that it is provided along the longitudinal direction of the frame (over the entire surface in the longitudinal direction). Since the torsional moment is applied throughout the longitudinal direction of the component, the deformation strength can be remarkably improved by providing a closed cross-sectional structure with high torsional rigidity over the entire longitudinal direction.

これによって、本発明では、構造部材に、前記曲げ荷重とねじりモーメントが複合的に加わっても、破断や座屈変形しない高い変形強度を得ることができる。しかも、この効果をアルミニウム合金押出形材による軽量化効果を阻害しない範囲で達成できる。   Accordingly, in the present invention, even when the bending load and the torsional moment are applied to the structural member in combination, it is possible to obtain a high deformation strength that does not break or buckle. And this effect can be achieved in the range which does not inhibit the weight reduction effect by an aluminum alloy extrusion shape material.

ただ、アルミニウム合金押出形材は、押出材である必然性から、断面形状が長手方向に(押出方向に)一様となり、その長手方向に(押出方向に)断面を可変させることが難しい。このため、本発明の前記閉断面部分は、断面形状が長手方向に(押出方向に)一様で良いものの、これに一体に設けられるために、一体に押し出されることを想定している前記突出フランジ部を、前記した通り、その長手方向に亙って断面幅が変化するように押出することは技術的に非常に困難である。   However, since the extruded shape of the aluminum alloy is necessarily an extruded material, the cross-sectional shape is uniform in the longitudinal direction (in the extrusion direction), and it is difficult to vary the cross section in the longitudinal direction (in the extrusion direction). For this reason, although the said closed cross-section part of this invention may have uniform cross-sectional shape in a longitudinal direction (extrusion direction), since it is integrally provided in this, it is assumed that it is extruded integrally. As described above, it is technically very difficult to extrude the flange portion so that the cross-sectional width changes along the longitudinal direction.

このような押出による可変断面幅製造の難しさが、本発明のような狭幅から広幅に連続的に変化する形状の突出フランジ部を有する押出形材にはある。長手方向(押出方向)に一様な断面形状(長手方向に一様な幅を有する前記突出フランジ部と前記閉断面部分とが一体となった)の押出形材を素材とした場合には、材料歩留まりが非常に悪くなるからである。即ち、この素材押出形材の突出フランジ部を斜めに切断して狭幅から広幅に変化させる場合、斜めに切断する際に大きな三角形の切り屑が生じて、材料歩留まりが非常に悪くなる。   The difficulty in manufacturing a variable cross-sectional width by such extrusion is present in an extruded profile having a protruding flange portion having a shape that continuously changes from narrow to wide as in the present invention. When an extruded profile having a uniform cross-sectional shape in the longitudinal direction (extrusion direction) (the projecting flange portion having a uniform width in the longitudinal direction and the closed cross-section portion are integrated) is used as a material, This is because the material yield becomes very poor. That is, when the projecting flange portion of the extruded material is cut obliquely to change from a narrow width to a wide width, large triangular chips are generated when cutting obliquely, resulting in a very poor material yield.

したがって、この本発明のような可変断面幅構造の押出形材は、材料歩留まりが改善されない限り、あるいは材料歩留まりが改善される作り方が考案できない限り、当業者にとって製造したくなるものではない。   Therefore, the extruded section having a variable cross-sectional width structure as in the present invention is not intended to be manufactured by those skilled in the art unless the material yield is improved or a method of making the material yield is not devised.

例えば、アルミニウム合金押出形材の長手方向に断面を可変させるための手段には、公知の手段として、プレス加工やハイドロフォームなどの後加工がある。しかし、これらの手段は加工コストが高くなるとともに、アルミニウム合金素材の伸びが低いために破断が生じやすく、製品形状が制限されるという大きな問題がある。特に高強度の7000系合金を用いる場合には、加工後の高残留応力に起因する応力腐食割れも問題になる懸念がある。そして、このような押出による可変断面幅製造の難しさが、押出形材を用いた場合に、本発明のような可変断面幅の部材とすることを想定しにくい所以(阻害要因)でもある。   For example, as means for changing the cross section in the longitudinal direction of an aluminum alloy extruded profile, known processes include post-processing such as pressing and hydroforming. However, these methods have a large problem that the processing cost becomes high and the elongation of the aluminum alloy material is low, so that breakage easily occurs and the product shape is limited. In particular, when a high-strength 7000 series alloy is used, there is a concern that stress corrosion cracking due to high residual stress after processing may also be a problem. The difficulty in manufacturing a variable cross-sectional width by such extrusion is also a reason (inhibition factor) that it is difficult to assume a member having a variable cross-sectional width as in the present invention when an extruded profile is used.

これに対して、本発明では、このような可変断面幅の押出形材の作り方も合わせて工夫し、素材アルミニウム合金押出形材を二分することによって、簡便に得ることができるようにした。   On the other hand, in the present invention, the method of producing such an extruded profile having a variable cross-sectional width is also devised, and the aluminum alloy extruded profile is divided into two parts so that it can be easily obtained.

即ち、後述するように、素材アルミニウム合金押出形材を、全長に亙って断面形状が同じである2本の平行な長尺の閉断面部と、これら閉断面部間に介在してこれら閉断面部同士を互いにつなぐ平坦なフランジ部とからなる、長手方向に(押出方向に)一様な断面形状として押し出す。そして、この素材アルミニウム合金押出形材において、前記突出フランジ部の部分を長手方向に亙って斜めに切断することによって突出フランジ部を形成し、この素材アルミニウム合金押出形材を平面視した場合に互いの形状が点対称になるように二分し、得ることができる。したがって、前記した材料歩留まりが非常に悪い切断加工によらずとも、可変断面幅とした押出形材を簡便に得ることができる。   That is, as will be described later, an aluminum alloy extruded profile is closed by inserting two parallel long closed cross-sections having the same cross-sectional shape over the entire length, and between these closed cross-sections. Extruded as a uniform cross-sectional shape in the longitudinal direction (in the extruding direction) consisting of flat flange portions that connect the cross-sectional portions to each other. And in this raw material aluminum alloy extruded shape, when the protruding flange portion is formed by obliquely cutting the protruding flange portion along the longitudinal direction, and the raw material aluminum alloy extruded shape is viewed in plan view It can be obtained by bisecting so that their shapes are point-symmetric. Therefore, an extruded profile having a variable cross-sectional width can be easily obtained without using the above-described cutting process with a very low material yield.

また、閉断面部を切断する場合と異なり、開断面部の切断加工は、シャー切断などを用いて容易に行うことができる。そして、得られた突出フランジ部を、前記したように引張荷重のみが加わる曲げ荷重負荷時に引張荷重が加わる部位に配置することで、開断面構造で問題になることが多い座屈を回避可能になり、軽量で高変形強度、かつ、低コストで生産可能な押出形材を得ることができる。   Further, unlike the case of cutting the closed cross section, the cutting process of the open cross section can be easily performed using shear cutting or the like. And by arranging the obtained protruding flange part at the part where the tensile load is applied when bending load is applied as described above, only the tensile load can be avoided. Thus, an extruded profile that is lightweight, has high deformation strength, and can be produced at low cost can be obtained.

本発明アルミニウム合金押出形材の一態様を示す斜視図である。It is a perspective view which shows one aspect | mode of this invention aluminum alloy extrusion shape material. 図1の側面図である。It is a side view of FIG. 本発明に係る図1の押出形材の構造部材への適用例を示す斜視図である。It is a perspective view which shows the example of application to the structural member of the extrusion shape member of FIG. 1 which concerns on this invention. 図1の押出形材の作り方を示す斜視図である。It is a perspective view which shows how to make the extrusion shape material of FIG. 本発明アルミニウム合金押出形材の別の態様を示す斜視図である。It is a perspective view which shows another aspect of this invention aluminum alloy extrusion shape member. 本発明押出形材の別の態様を示す断面図である。It is sectional drawing which shows another aspect of this invention extrusion shape member. 本発明押出形材の別の態様を示す断面図である。It is sectional drawing which shows another aspect of this invention extrusion shape member. 本発明押出形材の別の態様を示す断面図である。It is sectional drawing which shows another aspect of this invention extrusion shape member. 本発明押出形材の別の態様を示す断面図である。It is sectional drawing which shows another aspect of this invention extrusion shape member. 本発明押出形材の別の態様を示す断面図である。It is sectional drawing which shows another aspect of this invention extrusion shape member. 本発明押出形材の別の態様を示す断面図である。It is sectional drawing which shows another aspect of this invention extrusion shape member.

以下に、本発明の実施の形態につき、図面を用いて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図1は、本発明アルミニウム合金押出形材を、自動車車体に用いられるインパネ補強材のステーを例として、車体の上下方向に立設して用いる場合を示している。図2はこの図1の側面図である。   FIG. 1 shows a case in which an aluminum alloy extruded profile according to the present invention is used by being erected in the vertical direction of a vehicle body, taking as an example a stay of an instrument panel reinforcing material used in an automobile body. FIG. 2 is a side view of FIG.

ここで、前記インパネ補強材は、図3に示す通り、その軸方向(長手方向)が自動車の車体幅方向(図3の左下方向から右上方向)に延在するように設置される。この設置の場合、インパネ補強材10の長手方向(軸方向)の両端部10a(運転席側)、10b(助手席側)が、取り付け金具であるブラケット11、11を介して、図示しない車体フレームに取り付けられている。ブラケット11、11は、これも図示はしないが、常法では、車体フレーム側のブラケットなどを介して、車体フレームに取り付けられている。   Here, as shown in FIG. 3, the instrument panel reinforcing material is installed such that its axial direction (longitudinal direction) extends in the vehicle body width direction (from the lower left direction to the upper right direction in FIG. 3). In the case of this installation, both end portions 10a (driver's seat side) and 10b (passenger seat side) of the instrument panel reinforcement member 10 in the longitudinal direction (axial direction) are not shown through a body frame (not shown) via brackets 11 and 11 as mounting brackets. Is attached. Although not shown, the brackets 11 and 11 are usually attached to the vehicle body frame via brackets on the vehicle body frame side.

この図3では、本発明アルミニウム合金押出形材1からなるステー(ステイ)が、インパネ補強材10の中央部近傍に、車体の下方向(図3の下方向)に向かって、1本取り付けられている(間隔をあけて2本取り付けてもいい)。このステー(アルミニウム合金押出形材)1は、その下端部1bにおいて、図示しない車体の下方向に存在する車体フロアと、機械的にまたは溶接により接合されており、インパネ補強材10を車体フロアに接続、固定し、支持する役割を果たしている。   In FIG. 3, one stay (stay) made of the extruded aluminum alloy material 1 of the present invention is attached near the center of the instrument panel reinforcing member 10 in the downward direction of the vehicle body (downward in FIG. 3). (2 may be attached at intervals). This stay (aluminum alloy extruded profile) 1 is joined at its lower end 1b to a vehicle body floor, which is not shown, in the lower direction of the vehicle body, either mechanically or by welding, and the instrument panel reinforcement 10 is attached to the vehicle body floor. It plays the role of connecting, fixing and supporting.

因みに、図1では、このような図3のステー1を、図3の左側方から見た場合を示し、図1の左側方向が自動車の前方、図1の右側方向が自動車の後方向、図1の手前方向が助手席側、図1の奥行き方向が運転席側を示す。   Incidentally, FIG. 1 shows such a stay 1 of FIG. 3 as viewed from the left side of FIG. 3, wherein the left side direction of FIG. 1 is the front side of the automobile, the right side direction of FIG. 1 indicates the passenger seat side, and the depth direction in FIG. 1 indicates the driver seat side.

図1に示す通り、本発明アルミニウム合金押出形材1(ステー1)は、図の上下方向に延在する長尺の閉断面部8と、この閉断面部8の全長に亙って立設された平坦な突出フランジ部6とからなっている。ここで、長尺の閉断面部8は車体前方側(図3の左上方向側で、図1の左側)に立設され、平坦な突出フランジ部6は車体後方側(図3の右下方向側で、図1の右側)に立設されている。そして、この突出フランジ部6は、前記閉断面部8を構成する車体後方側(図3の右下方向で、図1の右側)の後面壁5の、車体幅方向に最も外側寄りの部位(図1の手前側の位置、図3の左下方向側の位置)から車体後方側(図3の右下方向側で、図1の右側)に突出、延在させている。したがって、突出フランジ部6の車体幅方向の外側の面が、前記閉断面部8を構成する車体幅方向の外側の外壁面であるウエブ壁3の外壁面と面一である。   As shown in FIG. 1, an aluminum alloy extruded profile 1 (stay 1) according to the present invention is erected over a long closed cross-sectional portion 8 extending in the vertical direction of the figure and over the entire length of the closed cross-sectional portion 8. And a flat projecting flange portion 6. Here, the long closed cross section 8 is erected on the front side of the vehicle body (upper left side in FIG. 3 and left side in FIG. 1), and the flat protruding flange portion 6 is on the rear side of the vehicle body (lower right direction in FIG. 3). On the right side of FIG. The projecting flange portion 6 is a portion of the rear wall 5 on the rear side of the vehicle body (the lower right direction in FIG. 3 and the right side in FIG. 1) constituting the closed cross section 8 that is located on the outermost side in the vehicle body width direction ( 1 protrudes and extends from the front side of FIG. 1 (the position on the lower left side in FIG. 3) to the rear side of the vehicle body (the lower right side in FIG. 3 and the right side in FIG. 1). Therefore, the outer surface in the vehicle body width direction of the projecting flange portion 6 is flush with the outer wall surface of the web wall 3 that is the outer wall surface in the vehicle body width direction constituting the closed cross section 8.

このように、突出フランジ部6を、前記閉断面部8を構成する車体後方側(図3の右下方向で、図1の右側)の後面壁5の、更に助手席側(図3の左下方向側、図1の手前側)の方にずれた(偏った)部位(位置)から、車体後方側(図3の右下方向側で、図1の右側)に突出、延在させることが、後述する通り、好ましい。   In this way, the protruding flange portion 6 is arranged further on the passenger seat side (lower left side in FIG. 3) of the rear wall 5 on the rear side of the vehicle body (lower right direction in FIG. 3, right side in FIG. 1) constituting the closed section 8. It is possible to project and extend from a position (position) shifted (biased) toward the direction side, the front side in FIG. 1 to the rear side of the vehicle body (on the lower right side in FIG. 3 and on the right side in FIG. 1). As described later, it is preferable.

更に、この突出フランジ部6の幅は、前記閉断面部8の上端部側1aから下端部側1bに向かって、狭幅から広幅になるように連続的に変化する形状を有している。即ち、突出フランジ部6の下端部側1bほど、上端部側1aよりも断面幅が増大するようにしている。即ち、この突出フランジ部6は、そのフランジ幅が、一端6a側から他端6b側に向かって、狭幅から広幅になるように連続的に変化する形状を有している。これを前記図1と対応させると、この突出フランジ部6のフランジ幅は、突出フランジ部6の端部6aである、前記閉断面部8の上端部側あるいはアルミニウム合金押出形材1の上端部側1aから、端部6bである、前記閉断面部8の下端部側あるいはアルミニウム合金押出形材1の下端部側1bに向かって、狭幅から広幅になるように連続的に変化する形状を有している。   Further, the width of the projecting flange portion 6 has a shape that continuously changes from the narrow width to the wide width from the upper end portion 1a to the lower end portion 1b of the closed cross section 8. In other words, the lower end side 1b of the projecting flange portion 6 has a larger cross-sectional width than the upper end side 1a. That is, the protruding flange portion 6 has a shape in which the flange width continuously changes from the narrow end to the wide end from the one end 6a side to the other end 6b side. When this corresponds to FIG. 1, the flange width of the projecting flange portion 6 is the end portion 6 a of the projecting flange portion 6, or the upper end portion side of the closed section 8 or the upper end portion of the aluminum alloy extruded profile 1. A shape that continuously changes from the narrow side to the wide side from the side 1a toward the lower end side of the closed cross section 8 or the lower end side 1b of the aluminum alloy extruded profile 1 that is the end 6b. Have.

ここで、この突出フランジ部6のフランジ幅の変化は、図1に示すように、直線状に変化しても良いが、図5に示すような折れ線状あるいは階段状、更には段階的などに変化しても良く、いずれも狭幅から広幅になるように連続的に変化する形状である。   Here, the change in the flange width of the projecting flange portion 6 may change linearly as shown in FIG. 1, but in the form of a polygonal line or step as shown in FIG. The shape may change, and each of them has a shape that continuously changes from narrow to wide.

図1において、前記構造部材(ステーなど)としてのアルミニウム合金押出形材1の使用中に、例えば、自動車の後方(図1の右側方向)から衝突荷重が負荷された場合、前記した押出形材の長手方向の上端部側1aから下端部側1bに向かって、下端部側1bを支点とし、上端部側1aを作用点とした、矢印で示す曲げ荷重P1が加わる。そして、更に、他部品を介してこの荷重が加わることで、押出形材1の幅方向(図1の左右方向)を径方向とする、円周方向のねじりモーメントM2も、その上端部側1aに加わる。   In FIG. 1, when the aluminum alloy extruded profile 1 is used as the structural member (stay, etc.), for example, when a collision load is applied from the rear of the automobile (right side in FIG. 1), the extruded profile described above is used. A bending load P1 indicated by an arrow is applied from the upper end side 1a in the longitudinal direction toward the lower end side 1b with the lower end side 1b as a fulcrum and the upper end side 1a as an action point. Further, when this load is applied via other parts, the torsional moment M2 in the circumferential direction having the radial direction in the width direction (left-right direction in FIG. 1) of the extruded profile 1 is also on the upper end side 1a. To join.

この曲げ荷重P1とねじりモーメントM2とを、図3のインパネ補強材10でも示す。図3に示す通り、ステー(押出形材)1に、自動車の後方(図3の右下側の方向)から衝突荷重Pが負荷された場合、ステーの長手方向の上端部側1aから下端部側1bに向かって、下端部側1bを支点とし、上端部側1aを作用点とした、矢印で示す曲げ荷重P1が加わる。そして、更に、ステー1の幅方向(図3の左右方向)を径方向とする、円周方向のねじりモーメントM2も、その上端部側1aに加わる。   The bending load P1 and the torsional moment M2 are also shown in the instrument panel reinforcing material 10 in FIG. As shown in FIG. 3, when a collision load P is applied to the stay (extrusion profile) 1 from the rear of the vehicle (the direction on the lower right side in FIG. 3), the upper end 1a in the longitudinal direction of the stay and the lower end A bending load P1 indicated by an arrow is applied toward the side 1b with the lower end side 1b as a fulcrum and the upper end side 1a as an action point. Further, a torsional moment M2 in the circumferential direction having the radial direction in the width direction of the stay 1 (left and right direction in FIG. 3) is also applied to the upper end side 1a.

このように、ステー(押出形材)1に作用するモーメントは、図1に矢印で示す通り、車体前方側に向く曲げ荷重P1に対応して生じる曲げモーメントM1と、形材断面の車体前側の部分を助手席側方向にねじるようなねじりモーメントM2とからなる。ここで、前記曲げ荷重P1に対応して加わる曲げモーメントM1は、下端部側1bで最大になり、車体後方側(図1の右側)の前記突出フランジ部6が曲げ外側,車体前方側(図1の左側)の前記閉断面部8が曲げ内側になる。   As described above, the moment acting on the stay (extruded profile) 1 includes the bending moment M1 generated corresponding to the bending load P1 directed to the front side of the vehicle body and the front side of the vehicle body in the cross section of the profile as shown by the arrows in FIG. It consists of a torsional moment M2 that twists the portion in the direction of the passenger seat. Here, the bending moment M1 applied corresponding to the bending load P1 is maximized at the lower end portion 1b, and the protruding flange portion 6 on the rear side of the vehicle body (the right side in FIG. 1) is bent outward, the vehicle body front side (FIG. 1) is on the inside of the bend.

このような複合モーメントに対して、前記アルミニウム合金押出形材1の構造は、比較的軽量で、高い変形強度を得ることができる。以下に、その理由を説明するが、このようなこの複合モーメントを考慮した、押出形材1の軽量化と変形強度向上を両立するためのポイントは、ねじり剛性の向上、曲げモーメントに起因する車体前方側部の座屈防止、アルミニウム合金押出形材1の一端側(図1では上端側)に対して他端側(図1では下端側)の変形強度をより高くすることの3点になる。   With respect to such a composite moment, the structure of the aluminum alloy extruded profile 1 is relatively lightweight and can obtain high deformation strength. The reason for this will be explained below. The points for achieving both weight reduction and deformation strength improvement of the extruded profile 1 in consideration of such a composite moment are the improvement in torsional rigidity and the vehicle body resulting from the bending moment. Prevention of buckling of the front side portion, and three points of higher deformation strength on the other end side (lower end side in FIG. 1) than one end side (upper end side in FIG. 1) of the aluminum alloy extruded profile 1 .

閉断面部の機能:
本発明アルミニウム合金押出形材1は、図1から分かる通り、曲げモーメントに起因する圧縮応力が加わる側(図1左側の車体前方側、図3左上方向側の車体前方側)に閉断面部8を有する。このような閉断面部構造は、押出材の特徴でもある、押出形材1の長手方向全面に亙って、一様な断面形状で設けられていることで、前記した通り、前記ねじりモーメントに対する、押出形材1の前記ねじり剛性を顕著に向上できるという効果がある。また、前記曲げ荷重に起因して、圧縮応力の加わる側(図1左側の車体前方側、図3左上方向側の車体前方側)に閉断面部8を配置することで、前記車体前方側部の座屈を抑制し、座屈強度も向上できるという効果がある。
Closed section function:
As can be seen from FIG. 1, the aluminum alloy extruded profile 1 of the present invention has a closed cross section 8 on the side to which the compressive stress due to the bending moment is applied (the front side of the vehicle body on the left side of FIG. 1, the front side of the vehicle body on the upper left side in FIG. 3). Have Such a closed cross-section structure is provided with a uniform cross-sectional shape over the entire length in the longitudinal direction of the extruded profile 1, which is also a feature of the extruded material. There is an effect that the torsional rigidity of the extruded profile 1 can be remarkably improved. Further, by disposing the closed cross section 8 on the side to which the compressive stress is applied due to the bending load (the vehicle body front side on the left side in FIG. 1 and the vehicle body front side on the left upper direction side in FIG. 3), The buckling strength can be suppressed and the buckling strength can be improved.

なお、前記した曲げ荷重負荷時に、高曲げ強度と重量軽減効果を効率的に得るためには、アルミニウム合金押出形材1あるいは閉断面部8の中立軸から遠い位置の断面積を大きくすることが有効である。この点で、車体前方側(図1左側の車体前方側)には、前記フランジ5と同じく、車体幅方向に平行な壁面を有するフランジ4を設けることが望ましい。そして、このフランジ4、5に直交し、車体前後方向(図1の左右方向)に延在する壁面を有するウェブ2、3を設けることが望ましい。したがって、閉断面部8の中空断面形状は図1のような矩形であることが好ましい。   In order to efficiently obtain a high bending strength and a weight reduction effect when the bending load is applied, it is necessary to increase the cross-sectional area at a position far from the neutral axis of the aluminum alloy extruded profile 1 or the closed cross-section 8. It is valid. In this respect, it is desirable to provide a flange 4 having a wall surface parallel to the vehicle body width direction, similar to the flange 5, on the vehicle body front side (vehicle body front side on the left side in FIG. 1). And it is desirable to provide the webs 2 and 3 which have a wall surface orthogonal to this flange 4 and 5 and extended in the vehicle body front-back direction (left-right direction of FIG. 1). Therefore, the hollow cross-sectional shape of the closed cross-sectional portion 8 is preferably a rectangle as shown in FIG.

突出フランジ部の機能:
本発明アルミニウム合金押出形材1は、前記した通り、前記閉断面部8を構成するひとつの壁5から前記閉断面部8の全長に亙って前記曲げモーメント作用時に曲げ外側となる方向(図1右側の車体後方側)に張り出した平坦な板状の突出フランジ部6を有する。
Function of protruding flange:
As described above, the aluminum alloy extruded profile 1 according to the present invention is a direction in which the outer side is bent when the bending moment is applied from one wall 5 constituting the closed section 8 to the entire length of the closed section 8 (see FIG. 1 has a flat plate-like protruding flange portion 6 projecting to the right side of the vehicle body rear side).

そして、更に、前記平坦な板状の突出フランジ部6を、閉断面部8を構成するフランジ壁5(後面壁5)から、車体後方側に突出させている。この図1の場合は、図1の奥行き方向が車体幅方向であり、前記閉断面部8を構成するフランジ壁5の車体幅方向最外側から突出している。   Further, the flat plate-like protruding flange portion 6 is protruded from the flange wall 5 (rear surface wall 5) constituting the closed section 8 to the rear side of the vehicle body. In the case of FIG. 1, the depth direction in FIG. 1 is the vehicle body width direction, and protrudes from the outermost side in the vehicle body width direction of the flange wall 5 constituting the closed cross section 8.

アルミニウム合金押出形材1に、前記車体衝突荷重に起因する曲げモーメントM1に、ねじりモーメントM2が加わっても、押出形材1の車体後方側(図1の右側方向)には、引張荷重のみが加わる。したがって、押出形材1のこの車体後方側には、閉断面部8をあえて構成する必要はなく、本発明では、軽量化および押出形材1の加工性を考慮して、平坦な板状の突出フランジ部6で構成している。そして、この突出フランジ部6の幅を、前記した通り、押出形材の上端側1aに比べて下端側1bを広幅にしていることで、押出形材1の下方ほど断面幅が増大するようにし、重量増加を最小限に抑制して、曲げ変形強度を高くすることができる。   Even if the torsional moment M2 is added to the bending moment M1 resulting from the vehicle body collision load to the aluminum alloy extruded shape 1, only the tensile load is applied to the rear side of the extruded shape 1 (right side in FIG. 1). Join. Therefore, it is not necessary to dare to form the closed cross section 8 on the rear side of the vehicle body of the extruded profile 1. In the present invention, a flat plate-like shape is considered in consideration of weight reduction and workability of the extruded profile 1. The projecting flange portion 6 is used. And as above-mentioned, the width | variety of this protrusion flange part 6 is made wider so that the cross-sectional width may increase toward the downward direction of the extrusion shape member 1 by making the lower end side 1b wider than the upper end side 1a of the extrusion shape member. The increase in weight can be suppressed to a minimum, and the bending deformation strength can be increased.

このような突出フランジ部6は、圧縮応力に対しては座屈変形しやすいという問題があるため、前記した通り、衝突時に引張荷重のみが加わる車体後方側に配置する必要がある。このため、前記曲げ荷重P1が、突出フランジ6に対して平行方向ではなく、若干角度を持つような場合、荷重負荷時に圧縮応力が作用しないように、フランジ壁5からの突出位置を選定することが望ましい。   Since such a protruding flange portion 6 has a problem that it tends to buckle and deform with respect to compressive stress, as described above, it is necessary to arrange it on the rear side of the vehicle body to which only a tensile load is applied during a collision. For this reason, when the bending load P1 is not parallel to the projecting flange 6 but has a slight angle, the projecting position from the flange wall 5 is selected so that compressive stress does not act when the load is applied. Is desirable.

たとえば、図2で示す通り、主荷重P1´と副荷重P1´´とで合成される荷重P1の方向のように、車幅方向に若干角度を持つ場合では、車幅方向での曲げ荷重に対して、突出フランジ部6が曲げ外側になる部位に配置することが、より望ましい。より具体的には、突出フランジ部6は、図1に示す、立設されている(車体後方側の)フランジ壁5の横方向(長手方向に直角方向、車体幅方向)の幅dの、少なくとも中央部分(d/2部分)よりも、断面の幅方向で曲げ外側方向位置から、車両後方に突出させることが望ましい。すなわち、前記した通り、この突出フランジ部6を、前記閉断面部8を構成する車体後方側(図3の右下方向で、図1の右側)の後面壁5の、車体幅方向に外側寄りの部位(図1の手前側の位置、図3の左下方向側の位置)から車体後方側(図3の右下方向側で、図1の右側)に突出、延在させることが好ましい。図1の形材1では、この突出フランジ部6を、前記した通り、後面壁5の車体幅方向に最も外側寄りの部位から車体後方側に突出、延在させている。   For example, as shown in FIG. 2, when there is a slight angle in the vehicle width direction, such as the direction of the load P1 combined with the main load P1 ′ and the sub load P1 ″, the bending load in the vehicle width direction On the other hand, it is more desirable to arrange the protruding flange portion 6 at a portion where the protruding flange portion 6 is bent outward. More specifically, the projecting flange portion 6 has a width d in the lateral direction (perpendicular to the longitudinal direction, the vehicle body width direction) of the flange wall 5 erected (on the vehicle body rear side) shown in FIG. It is desirable to project the vehicle rearward from the position in the bending outer direction in the width direction of the cross section, at least from the center portion (d / 2 portion). That is, as described above, the projecting flange portion 6 is placed outwardly in the vehicle body width direction of the rear wall 5 on the rear side of the vehicle body (the lower right direction in FIG. 3 and the right side in FIG. 1) constituting the closed section 8. It is preferable to project and extend from the part (position on the near side in FIG. 1, position on the lower left direction in FIG. 3) to the rear side of the vehicle body (on the lower right side in FIG. 3, right side in FIG. 1). In the profile 1 shown in FIG. 1, the protruding flange portion 6 protrudes and extends from the outermost portion of the rear wall 5 in the vehicle width direction to the vehicle rear side as described above.

また、同じアルミニウム合金押出形材1の構成であっても、より高い曲げ強度を得て、より軽量化を図るためには、押出形材1の中立軸から遠い位置の断面積を大きくすることが有効である。この効果を高めるために、前記したように、車幅方向に加わる副荷重に対して最も曲げ外側になる位置、つまり、フランジ壁5の車体幅方向外壁面3と面一に、突出フランジ部6を配置することが望ましい。   Moreover, even if it is the structure of the same aluminum alloy extrusion shape material 1, in order to obtain higher bending strength and to achieve weight reduction, the cross-sectional area of the position far from the neutral axis of the extrusion shape material 1 should be enlarged. Is effective. In order to enhance this effect, as described above, the protruding flange portion 6 is located at the most bending outer side with respect to the subload applied in the vehicle width direction, that is, flush with the outer wall surface 3 in the vehicle body width direction of the flange wall 5. It is desirable to arrange.

図1において一点鎖線で示す線がアルミニウム合金押出形材1の中立軸である。図1の態様は、この一点鎖線で示す中立軸から遠い位置の断面積を大きくするための具体的な態様を示しており、押出形材1の前記突出フランジ部6が、前記閉断面部8の後面壁5の最も幅方向外側から、車体後方側に突出している。このため、この図1の態様では、押出形材1の前記突出フランジ部6の車体幅方向の最外側面が、前記閉断面部8を構成する車体幅方向の最外側面であるウエブ壁3の外壁面と面一である。   In FIG. 1, a line indicated by a one-dot chain line is a neutral axis of the aluminum alloy extruded profile 1. The mode of FIG. 1 shows a specific mode for enlarging the cross-sectional area at a position far from the neutral axis indicated by the alternate long and short dash line, and the protruding flange portion 6 of the extruded profile 1 has the closed cross-section portion 8. The rear wall 5 protrudes from the outermost side in the width direction to the rear side of the vehicle body. Therefore, in the embodiment of FIG. 1, the web wall 3 in which the outermost surface in the vehicle body width direction of the protruding flange portion 6 of the extruded profile 1 is the outermost surface in the vehicle body width direction constituting the closed cross section 8. It is flush with the outer wall surface.

図6は、比較のために、図1の突出フランジ部6が、閉断面部8を構成するフランジ壁5の車体幅方向の最外側部ではなく、若干内側から突出させている突出フランジ部6を示している。ここで、図7も、閉断面部8を構成するフランジ壁5(前記図1での後面壁5)の車体幅方向最外側より若干内側寄りの部分から、突出フランジ部6を車体後方側に突出させている点は同じである。なお、図6、7、8でも一点鎖線で示す線が押出形材1の中立軸である。   For comparison, FIG. 6 shows a protruding flange portion 6 in which the protruding flange portion 6 of FIG. 1 protrudes slightly from the inside rather than the outermost portion in the vehicle body width direction of the flange wall 5 constituting the closed section 8. Is shown. Here, also in FIG. 7, the protruding flange portion 6 is moved to the rear side of the vehicle body from a portion slightly inside the vehicle body width direction outermost side of the flange wall 5 (the rear wall 5 in FIG. 1) constituting the closed section 8. The protruding point is the same. 6, 7, and 8, the line indicated by the alternate long and short dash line is the neutral axis of the extruded profile 1.

閉断面部の中空断面形状:
アルミニウム合金押出形材1の閉断面部8の中空断面形状自体は、押出によって安価に製造可能で、本発明効果が発揮できる形状であれば、車体用シートや他の部材の設計範囲内で、自由に設計できる。
Hollow section shape of closed section:
The hollow cross-sectional shape itself of the closed cross-sectional portion 8 of the aluminum alloy extruded profile 1 can be manufactured at a low cost by extrusion, and within the design range of the vehicle body seat and other members, as long as the effect of the present invention can be exhibited, You can design freely.

前記図1および図2の態様では、閉断面部8は、その壁面が車体幅方向に互いに平行に延在する2枚のフランジ壁4、5と、これらフランジ壁4、5同士を互いに連結するとともに、その壁面が車体長手方向に互いに平行に延在する2枚のウェブ壁2、3とで形成される矩形断面を有する。   1 and 2, the closed cross-section portion 8 connects two flange walls 4 and 5 whose wall surfaces extend in parallel to each other in the vehicle body width direction, and these flange walls 4 and 5 are connected to each other. In addition, the wall surface has a rectangular cross section formed by two web walls 2 and 3 extending parallel to each other in the longitudinal direction of the vehicle body.

前記フランジ壁5は、前記図1、2での後面壁5となる車体幅方向に延在するフランジ壁5であって、平坦な板状の突出フランジ部6を、閉断面部8の全長に亙って、かつ側方に向かって、即ち、前記図1、2での車体後方側に向かって、突出させている。したがって、反対側のフランジ壁4は前記図1、2での前面壁4であり、前記ウェブ壁2、3は前記図1での車体前後方向に延在するウェブ壁2、3である。   The flange wall 5 is a flange wall 5 that extends in the vehicle body width direction, which becomes the rear wall 5 in FIGS. 1 and 2, and a flat plate-like protruding flange portion 6 is extended to the entire length of the closed section 8. In other words, it protrudes toward the side, that is, toward the rear side of the vehicle body in FIGS. Accordingly, the opposite flange wall 4 is the front wall 4 in FIGS. 1 and 2, and the web walls 2 and 3 are the web walls 2 and 3 extending in the longitudinal direction of the vehicle body in FIG.

これに対して、図7、8の態様では、図1の矩形中空断面形状以外の、三角形の中空断面形状を示している。図8は、押出形材1の前記突出フランジ部6が、前記閉断面部8の後面壁5の車体幅方向に最も外側寄りの部分から車体後方側に突出し、突出フランジ部6の車体幅方向の外側の面が、前記閉断面部8を構成する車体幅方向の外側の外壁面であるウエブ壁3の外壁面と面一である。図7は、前記図6と同様に、図8の突出フランジ部6よりも、閉断面部8を構成するフランジ壁5の車体幅方向により内側から突出させている突出フランジ部6を示している。   On the other hand, the aspect of FIG. 7, 8 has shown the triangular hollow cross-sectional shape other than the rectangular hollow cross-sectional shape of FIG. FIG. 8 shows that the protruding flange portion 6 of the extruded shape member 1 protrudes from the outermost portion in the vehicle body width direction of the rear surface wall 5 of the closed cross-section portion 8 toward the vehicle body rear side, and the protruding flange portion 6 has a vehicle width direction. The outer surface of the web wall 3 is flush with the outer wall surface of the web wall 3 which is the outer wall surface of the closed cross section 8 in the vehicle body width direction. 7 shows the protruding flange portion 6 that protrudes from the inner side in the vehicle body width direction of the flange wall 5 constituting the closed cross-section portion 8 than the protruding flange portion 6 of FIG. .

図9、10の態様は、その断面形状は前記図6と概ね同じであるが、さらに変形強度を高くするために、閉断面部8を構成する壁のうち、前記曲げモーメント作用時に曲げ内側(各図の左側)に位置する壁の少なくとも一部が、閉断面部8を構成する他の壁の厚みに比べて、厚肉となっている。即ち、図9ではフランジ壁4が、図10ではフランジ壁4とウェブ2とが、他の壁の厚みに比べて、厚肉となっている。   9 and 10 are substantially the same in cross-sectional shape as in FIG. 6, but in order to further increase the deformation strength, the inner side of the wall constituting the closed cross-sectional portion 8 is bent when the bending moment acts ( At least a part of the wall located on the left side of each figure is thicker than the thickness of the other walls constituting the closed cross section 8. That is, the flange wall 4 in FIG. 9 and the flange wall 4 and the web 2 in FIG. 10 are thicker than the thickness of the other walls.

ここで、本発明におけるアルミニウム合金押出形材の閉断面部8の、最も薄い壁の厚みは、軽量化を阻害せずに、前記必要な強度を満たすことを考慮すると、1.8mm〜3mmの範囲であることが好ましい。   Here, the thickness of the thinnest wall of the closed cross-sectional portion 8 of the aluminum alloy extruded profile according to the present invention is 1.8 mm to 3 mm in consideration of satisfying the necessary strength without hindering weight reduction. A range is preferable.

図11の態様は、その断面形状は前記図6と概ね同じであるが、さらに変形強度を高くするために、押出形材1の突出フランジ部6の端部の一部が符号10で示す通り、その長手方向に亙って、一方向に折り曲げられている態様を示している。図11では、上方向に90°だけ、長手方向に亙って一様に折り曲げられている態様を示しているが、折り曲げる方向は反対の下方向であっても、斜めの上下方向のいずれであっても、その折り曲げ角度を含めて問わない。また、折り曲げ方も長手方向に亙って一様でなくても良く、途中で、折り曲げ角度や方向が変化しても良い。   11 is substantially the same in cross-sectional shape as in FIG. 6, but in order to further increase the deformation strength, a part of the end of the protruding flange portion 6 of the extruded shape member 1 is denoted by reference numeral 10. , The aspect bent in one direction over the longitudinal direction is shown. Although FIG. 11 shows a mode in which the sheet is uniformly bent over the longitudinal direction by 90 ° in the upward direction, the folding direction may be the opposite downward direction or the diagonal upward or downward direction. Even if it exists, it does not matter including the bending angle. Further, the folding method may not be uniform in the longitudinal direction, and the folding angle and direction may change midway.

本発明押出形材の作り方:
本発明アルミニウム合金押出形材1は、前記図4の通り、一つの素材アルミニウム合金押出形材から、突出フランジ6の部分で斜めに切断加工して二分し、2個の押出形材1、1として、各々得ることができる。
How to make the extruded shape of the present invention:
As shown in FIG. 4, the aluminum alloy extruded profile 1 of the present invention is cut into two parts by oblique cutting at one portion of the protruding flange 6 from one material aluminum alloy extruded profile, and the two extruded profiles 1, 1 As can be obtained respectively.

前記した通り、長手方向(押出方向)に一様な断面形状(長手方向に一様な幅を有する前記突出フランジ部と前記閉断面部分とが一体となった)押出形材を素材とした場合には、この素材押出形材の突出フランジ部を斜めに切断して狭幅から広幅に変化させる場合に、斜めに切断する際に大きな三角形の切り屑が生じて、材料歩留まりが非常に悪くなる。したがって、本発明押出形材のような、押出による可変断面幅製造が難しい形状は、その製造の難しさ自体が、本発明押出形材の構造部材適用の阻害要因となる。   As described above, when the extruded profile is made of a uniform cross-sectional shape in the longitudinal direction (extrusion direction) (the projecting flange portion having a uniform width in the longitudinal direction and the closed cross-section portion are integrated) In the case where the protruding flange portion of this material extruded shape is cut obliquely to change from narrow to wide, large triangular chips are generated when cutting obliquely, resulting in a very poor material yield. . Therefore, in a shape that is difficult to produce with a variable cross-sectional width by extrusion, such as the extruded shape of the present invention, the difficulty of the production itself becomes a hindrance to the application of the structural member of the extruded shape of the present invention.

これに対して、本発明では、このような可変断面幅の押出形材の作り方も合わせて工夫し、素材アルミニウム合金押出形材を二分することによって、簡便に得ることができるようにした。   On the other hand, in the present invention, the method of producing such an extruded profile having a variable cross-sectional width is also devised, and the aluminum alloy extruded profile is divided into two parts so that it can be easily obtained.

即ち、図4の素材アルミニウム合金押出形材は、前記押出形材1用の(押出形材1と同じ)閉断面部8を両端部に平行に各々2個配置し、閉断面部6、6間に介在して、これら閉断面部6、6同士を互いにつなぐ、平坦な板状フランジ6からなる。   That is, the material aluminum alloy extruded shape shown in FIG. 4 has two closed cross-section portions 8 for the extruded shape portion 1 (same as the extruded shape portion 1) arranged in parallel at both end portions. It consists of a flat plate-like flange 6 that is interposed between the closed cross-section portions 6 and 6 and connects them.

このような素材アルミニウム合金押出形材を、通常通り、長手方向に(押出方向に)一様な断面形状(全長に亙って断面形状が同じ)として押し出す。そして、カッターやシャーなどによって所定の長さ(長尺)に切断された、この素材アルミニウム合金押出形材の前記突出フランジ部6の部分を、やはりカッターやシャーなどによって、図4に示す通り、その長手方向に亙って斜めに切断して二分する。この際、この素材アルミニウム合金押出形材を平面視した場合に互いの形状が点対称になるように二分することによって、歩留りと効率良く、同じ押出形材1の2本取りができる。   Such a material aluminum alloy extruded shape is extruded as a uniform cross-sectional shape in the longitudinal direction (in the extruding direction) (the cross-sectional shape is the same over the entire length) as usual. And, as shown in FIG. 4, the portion of the protruding flange portion 6 of this material aluminum alloy extruded profile, which has been cut to a predetermined length (long) by a cutter or a shear, is also shown in FIG. Cut in half along the longitudinal direction and bisect. At this time, when the raw material aluminum alloy extruded profile is viewed in plan, it is divided into two so that the shapes of the extruded shapes are point-symmetric with each other, so that two identical extruded profiles 1 can be obtained with high yield.

このように、突出フランジ部6の部分をその長手方向に亙って斜めに切断によって、この突出フランジ部6のフランジ幅が、突出フランジ部6の端部6aから端部6bに向かって、狭幅から広幅になるように連続的に変化する形状が形成できる。前記した通り、この突出フランジ部6のフランジ幅の変化は、図1に示すような直線状に連続的に変化しなくても良い。しかし、フランジ幅の変化が図5に示すような折れ線状あるいは階段状、更には段階的などに変化するなど、直線状あるいは円弧状に変化せず、この変化が断続的になればなるほど、前記切断がしにくく、本発明押出形材が作りにくくなる。したがって、前記フランジ幅を変化させる突出フランジ部6の形状は、変形強度と切断のしやすさから決定することが好ましい。   Thus, the flange width of the projecting flange portion 6 is narrowed from the end portion 6a to the end portion 6b of the projecting flange portion 6 by obliquely cutting the projecting flange portion 6 along the longitudinal direction. A shape that continuously changes from width to width can be formed. As described above, the change in the flange width of the projecting flange portion 6 may not change continuously in a straight line as shown in FIG. However, the change in the flange width does not change in a linear or arc shape, such as a polygonal line shape or a step shape as shown in FIG. It is difficult to cut and it is difficult to produce the extruded profile of the present invention. Therefore, the shape of the protruding flange portion 6 that changes the flange width is preferably determined from the deformation strength and the ease of cutting.

構造部材としての使用態様:
この図4、5に示す、押出形材1の各所に設けた7は、各々押出形材1の閉断面部8や突出フランジ部6に設けたボルト締結用の貫通穴である。このように、ボルト締結用の貫通穴を予め押出形材1の必要各所に設けておれば、構造部材として、他の構造部材との接合や締結が容易となる。
Usage as a structural member:
4 and 5, 7 provided at various locations on the extruded shape member 1 are bolt fastening through holes provided in the closed cross-section portion 8 and the protruding flange portion 6 of the extruded shape member 1. As described above, if through holes for fastening bolts are provided in the necessary portions of the extruded shape member 1 in advance, joining and fastening with other structural members as structural members becomes easy.

構造部材として、本発明アルミニウム合金押出形材1と接合、あるいは組み合わせる側の部材の材料は、通常使用される鋼材(普通鋼、ハイテン)、アルミニウム合金材、樹脂材などであり、接合方法自体も溶融溶接あるいはボルト接合など便宜選択される。   As a structural member, the material of the member to be joined or combined with the aluminum alloy extruded profile 1 of the present invention is a steel material (ordinary steel, high tensile steel), an aluminum alloy material, a resin material, etc., and the joining method itself is also used. It is selected for convenience such as fusion welding or bolt joining.

なお、前記した複合モーメントの負荷のされ方における「一端を支点とし他端を作用点とした」とは、前記した通り、アルミニウム合金押出形材に対する、ねじりモーメントと曲げ荷重負荷の形態である。構造部材は、通常は、両端を支持あるいは接合され、これらの支持あるいは接合手段も、周知の通り、互いの嵌合を含めて、ボルトなどの機械的な接合手段や溶接などの種々の手段によって接合される。   As described above, “with one end as a fulcrum and the other end as an action point” in the manner of applying the composite moment described above is a form of torsional moment and bending load applied to the aluminum alloy extruded profile. The structural member is usually supported or joined at both ends, and these support or joining means are also known by various means such as mechanical joining means such as bolts and welding, as well as fitting to each other. Be joined.

このため、前記「一端を支点とし他端を作用点とした」とは、前記した通り複合的な荷重あるいはモーメントの負荷形態であって、通常は両端を支持あるいは接合される構造部材の、これら支持あるいは接合状態や接合手段を規定あるいは限定するものではない。   Therefore, “the one end as a fulcrum and the other end as an action point” is a composite load or moment load form as described above, and these structural members are usually supported or joined at both ends. The supporting or joining state and joining means are not defined or limited.

本発明アルミニウム合金押出形材は、軽量化を阻害せずに、前記必要な強度を満たすための壁の厚みとしては、閉断面部8や突出フランジ部6を合わせて、最も薄い壁の厚みが1.8mm〜3mmの範囲であることが好ましい。このような厚み条件のもとで、高い変形強度を得るために、本発明押出形材に適用するアルミニウム合金は、構造部材としての使用時の0.2%耐力が300MPa以上の高強度であることが必要である。   In the aluminum alloy extruded profile of the present invention, the thickness of the wall for satisfying the required strength without impairing the weight reduction is the thinnest wall thickness including the closed cross-section portion 8 and the protruding flange portion 6. It is preferable that it is the range of 1.8 mm-3 mm. In order to obtain a high deformation strength under such a thickness condition, the aluminum alloy applied to the extruded profile of the present invention has a high strength of 0.2% proof stress when used as a structural member of 300 MPa or more. It is necessary.

そして、このような高強度アルミニウム合金押出形材とは、T5以上の調質処理を施した(溶体化および焼入れ処理や人工時効処理などの熱処理を施した)、高強度なA6000系かA7000系のアルミニウム合金を用いることが好ましい。他のアルミニウム合金系では、組成や調質処理を調整しても、構造部材としての使用時の0.2%耐力を前記300MPa以上とすることが困難であり、例えそのように高強度とできても製造コストが高くなる可能性がある。   Such a high-strength aluminum alloy extruded shape has a tempering treatment of T5 or higher (solution treatment, heat treatment such as quenching treatment or artificial aging treatment), high-strength A6000 series or A7000 series. It is preferable to use the aluminum alloy. In other aluminum alloy systems, even if the composition and tempering treatment are adjusted, it is difficult to set the 0.2% proof stress when used as a structural member to be 300 MPa or more. However, the manufacturing cost may increase.

本発明によれば、構造部材の軽量化のためにアルミニウム合金押出形材を用いたとしても、車体衝突時などに加わる前記複合モーメントからなる変形荷重に対して、高い変形強度が得られる。このため、軽量化と変形強度とがともに要求される自動車などの前記構造部材に好適である。   According to the present invention, even when an aluminum alloy extruded shape is used to reduce the weight of the structural member, a high deformation strength can be obtained with respect to a deformation load composed of the composite moment applied during a vehicle body collision or the like. For this reason, it is suitable for the structural member such as an automobile that requires both weight reduction and deformation strength.

1:アルミニウム合金押出形材、2、3:ウエブ壁、4、5:フランジ壁、6:突出フランジ部、7:貫通穴、8:閉断面部、9:素材アルミニウム合金押出形材   1: Aluminum alloy extruded profile, 2, 3: Web wall, 4, 5: Flange wall, 6: Protruding flange, 7: Through hole, 8: Closed section, 9: Material aluminum alloy extruded profile

Claims (7)

構造部材としての使用中に長手方向の一端に曲げ荷重とねじりモーメントとが負荷されるアルミニウム合金押出形材であって、0.2%耐力が300MPa以上であり、かつ、全長に亙って断面形状が同じである長尺の閉断面部と、この閉断面部を構成するひとつの壁から前記閉断面部の全長に亙って前記曲げ荷重作用時に曲げ外側となる方向に張り出した平坦な突出フランジとからなり、この突出フランジの幅が、前記閉断面部の前記作用点となる一端側から前記支点となる他端側に向かって、狭幅から広幅になるように連続的に変化する形状を有したことを特徴とする変形強度が高い構造部材用アルミニウム合金押出形材。   An aluminum alloy extruded profile in which a bending load and a torsional moment are applied to one end in the longitudinal direction during use as a structural member, 0.2% proof stress is 300 MPa or more, and a cross section over the entire length A long closed cross-sectional portion having the same shape, and a flat protrusion that protrudes from one wall constituting the closed cross-sectional portion over the entire length of the closed cross-sectional portion in the direction of bending outward when the bending load is applied A shape in which the width of the projecting flange is continuously changed from a narrow width to a wide width from one end side serving as the action point of the closed cross-section portion toward the other end side serving as the fulcrum. An aluminum alloy extruded shape for structural members having a high deformation strength. 前記アルミニウム合金押出形材の突出フランジの一方の面が、前記閉断面部を構成する一つの壁の外壁面と面一である請求項1に記載の構造部材用アルミニウム合金押出形材。   2. The aluminum alloy extruded shape for a structural member according to claim 1, wherein one surface of the protruding flange of the aluminum alloy extruded shape is flush with an outer wall surface of one wall constituting the closed cross section. 前記アルミニウム合金押出形材の閉断面部が4つの壁で形成された矩形断面形状を有した請求項1または2に記載の構造部材用アルミニウム合金押出形材。   The aluminum alloy extruded shape for structural members according to claim 1 or 2, wherein the closed section of the aluminum alloy extruded shape has a rectangular sectional shape formed by four walls. 前記アルミニウム合金押出形材の閉断面部を構成し、前記曲げ荷重作用時に曲げ内側に位置する壁の少なくとも一部が、前記閉断面部を構成する他の壁の厚みに比べて、厚肉である請求項1乃至3のいずれか1項に記載の構造部材用アルミニウム合金押出形材。   A closed cross-section portion of the aluminum alloy extruded profile is configured, and at least a part of the wall located inside the bend when the bending load is applied is thicker than the thickness of the other walls configuring the closed cross-section portion. The aluminum alloy extruded shape for structural members according to any one of claims 1 to 3. 前記アルミニウム合金押出形材の突出フランジの端部の少なくとも一部が、その長手方向に亙って一方向に折り曲げられている請求項1乃至4のいずれか1項に記載の構造部材用アルミニウム合金押出形材。   The aluminum alloy for structural members according to any one of claims 1 to 4, wherein at least a part of an end portion of the protruding flange of the aluminum alloy extruded shape member is bent in one direction along a longitudinal direction thereof. Extruded shape. 前記アルミニウム合金押出形材が、素材アルミニウム合金押出形材を二分して得られたものであり、この素材アルミニウム合金押出形材は、全長に亙って断面形状が同じである2本の平行な長尺の閉断面部と、これら閉断面部間に介在してこれら閉断面部同士を互いにつなぐ平坦な突出フランジとからなり、この突出フランジの部分を長手方向に亙って斜めに切断することによって、この素材アルミニウム合金押出形材を平面視した場合に互いの形状が点対称になるように二分したものである請求項1乃至5のいずれか1項に記載の構造部材用アルミニウム合金押出形材。   The aluminum alloy extruded profile was obtained by bisecting the material aluminum alloy extruded profile, and this material aluminum alloy extruded profile was composed of two parallel sections having the same cross-sectional shape over the entire length. It consists of a long closed cross-section and a flat protruding flange that is interposed between these closed cross-sections and connects the closed cross-sections to each other, and this protruding flange portion is cut obliquely over the longitudinal direction. The aluminum alloy extruded shape for structural members according to any one of claims 1 to 5, wherein the aluminum alloy extruded shape material is bisected so that the shapes thereof are point-symmetric when viewed in plan. Wood. 前記アルミニウム合金押出形材の閉断面部のうち、最も薄い壁の厚みが1.8mm〜3mmの範囲である請求項1乃至6のいずれか1項に記載の構造部材用アルミニウム合金押出形材。   The aluminum alloy extruded shape for a structural member according to any one of claims 1 to 6, wherein a thickness of a thinnest wall in a closed cross-section portion of the aluminum alloy extruded shape is in a range of 1.8 mm to 3 mm.
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