JP4515388B2 - Aluminum alloy door beam and automobile door structure - Google Patents

Aluminum alloy door beam and automobile door structure Download PDF

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JP4515388B2
JP4515388B2 JP2006003013A JP2006003013A JP4515388B2 JP 4515388 B2 JP4515388 B2 JP 4515388B2 JP 2006003013 A JP2006003013 A JP 2006003013A JP 2006003013 A JP2006003013 A JP 2006003013A JP 4515388 B2 JP4515388 B2 JP 4515388B2
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door beam
aluminum alloy
cross
flanges
door
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JP2006103687A (en
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浩之 山下
正和 平野
秀樹 石飛
光雄 日野
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Kobe Steel Ltd
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本発明は、自動車のドア補強用部材として使用されるアルミニウム合金製ドアビーム及び自動車のドア構造に関する。   The present invention relates to an aluminum alloy door beam used as an automobile door reinforcing member and an automobile door structure.

下記特許文献１には、アルミニウム合金押出材からなり、長手方向に垂直な断面において、図５に示すように、圧縮側フランジ１と引張側フランジ２を一対のウエブ３、４により連結した断面形状を有し、かつ圧縮側フランジ１の中心線ａと引張側フランジ２の中心線ｂがずれているドアビームが記載されている。なお、中心線ａ、ｂは、長手方向に垂直な断面において各フランジの中心（長さの中心）を通り荷重Ｐの方向に引いた線である。なお、図２のドアビームの両フランジ１、２はそれぞれ均一な厚さをもち、かつ互いに平行であるから、中心線ａ、ｂの方向は両フランジ１、２に垂直である。   The following Patent Document 1 is made of an aluminum alloy extruded material, and in a cross section perpendicular to the longitudinal direction, as shown in FIG. And a door beam in which the center line a of the compression side flange 1 and the center line b of the tension side flange 2 are shifted is described. The center lines a and b are lines drawn in the direction of the load P through the center (length center) of each flange in a cross section perpendicular to the longitudinal direction. Since both the flanges 1 and 2 of the door beam in FIG. 2 have a uniform thickness and are parallel to each other, the directions of the center lines a and b are perpendicular to the flanges 1 and 2.

このドアビームは、荷重Ｐが圧縮側フランジ１に均等にかかったと仮想したときの荷重の作用線（圧縮側フランジ１の中心線ａと同じ位置、矢印で表示）が引張側フランジの中心線ｂとずれているため、曲げ荷重Ｐを受けたとき、ビーム断面がひしゃげるように座屈変形（ウエブが倒れる）を起こしやすく、割れが生じるほど引張側に歪みが蓄積される前に荷重が大きく低下し、その結果、前記公報に記載されたように、引張側フランジ２側の負荷が緩和され、引張側に割れが発生し難くなり、圧縮側にも割れが発生しにくくなる。これにより、破断変位を大幅に改善することができ、短いビーム長でも大きい破断変位を得ることができ、同時に重量を増やすことなく必要な最大荷重及びエネルギー吸収量を稼ぐことができる。   This door beam has a load acting line (in the same position as the center line a of the compression side flange 1 and indicated by an arrow) when it is assumed that the load P is evenly applied to the compression side flange 1 and the center line b of the tension side flange. Due to the deviation, when subjected to a bending load P, the beam cross-section is likely to buckle (the web collapses) so that the load is greatly reduced before the strain is accumulated on the tension side as cracking occurs. As a result, as described in the above publication, the load on the tension side flange 2 is relaxed, cracks are less likely to occur on the tension side, and cracks are less likely to occur on the compression side. Thereby, the breaking displacement can be greatly improved, a large breaking displacement can be obtained even with a short beam length, and the necessary maximum load and energy absorption amount can be obtained without increasing the weight at the same time.

特開平１１−２７８０５４号公報Japanese Patent Laid-Open No. 11-278054

ドアビームは、剛性向上、振動騒音防止等のために、フランジとドアのアウターパネルを１乃至複数箇所で接着剤を介して接着しておく場合があるが、フランジは湾曲していないため湾曲したアウターパネルとの隙間が一定でなく、接着しにくいという不利がある。本発明は、この点を改良することを第１の目的とする。
また、実際の荷重方向が想定している方向（中心線ａ、ｂと平行）から斜めにずれた場合、フランジがその荷重を垂直に受けることができないという問題がある。本発明は、この点を改良することを他の目的とする。 For door beams, the flange and the outer panel of the door may be bonded at one or more locations via an adhesive to improve rigidity, prevent vibration and noise, etc., but since the flange is not curved, the curved outer There is a disadvantage that the gap with the panel is not constant and it is difficult to adhere. The first object of the present invention is to improve this point.
Further, when the actual load direction is obliquely deviated from the assumed direction (parallel to the center lines a and b), there is a problem that the flange cannot receive the load vertically. Another object of the present invention is to improve this point.

本発明に係るアルミニウム合金製ドアビームは、一対のフランジが一対のウエブにより連結されたアルミニウム合金押出材からなり、長手方向に垂直な断面をみたとき、圧縮側フランジが外側に湾曲していることを特徴とする。
また、本発明に係るアルミニウム合金製ドアビームは、一対のフランジが一対のウエブにより連結されたアルミニウム合金押出材からなり、長手方向に垂直な断面をみたとき、圧縮側フランジが外側に湾曲し、その曲率をドアのアウターパネルの曲率に合わせたことを特徴とする。
さらに、本発明に係るアルミニウム合金製ドアビームは、一対のフランジが一対のウエブにより連結されたアルミニウム合金押出材からなり、長手方向に垂直な断面をみたとき、圧縮側フランジが外側に湾曲し、前記アウターパネルとの隙間がほぼ一定であることを特徴とする。
前記ドアビームとアウターパネルの内側を、１乃至複数箇所において、接着剤で接着することができる。 The aluminum alloy door beam according to the present invention is made of an aluminum alloy extruded material in which a pair of flanges are connected by a pair of webs, and the compression side flange is curved outward when viewed in a cross section perpendicular to the longitudinal direction. Features.
Further, the aluminum alloy door beam according to the present invention is made of an aluminum alloy extruded material in which a pair of flanges are connected by a pair of webs, and when viewed in a cross section perpendicular to the longitudinal direction, the compression side flange is curved outward. The curvature is matched to the curvature of the outer panel of the door.
Further, the aluminum alloy door beam according to the present invention is made of an aluminum alloy extruded material in which a pair of flanges are connected by a pair of webs, and when viewed in a cross section perpendicular to the longitudinal direction, the compression side flange is curved outward, The gap with the outer panel is substantially constant.
The inside of the door beam and the outer panel can be bonded with an adhesive at one or more places.

本発明のドアビームの場合、長手方向に垂直な断面において圧縮側フランジが外側に湾曲していることに基づき、その曲率を湾曲したアウターパネルと合わせて隙間を一定にすることにより、フランジとアウターパネルの接着剤による接着がしやすくなるという利点がある。また、実際の荷重方向が想定している方向から斜めにずれた場合でも、フランジがその荷重を垂直に受けることができるという利点がある。   In the case of the door beam of the present invention, based on the fact that the compression side flange is curved outward in the cross section perpendicular to the longitudinal direction, the gap and the outer panel are made constant by combining the curvature with the curved outer panel. There is an advantage that it is easy to bond with the adhesive. Further, even when the actual load direction is obliquely deviated from the assumed direction, there is an advantage that the flange can receive the load vertically.

図１にドアビームの一例（長手方向に垂直な断面）を示す。このドアビームは、一対のフランジ１１、１２が一対のウエブ１３、１４により連結されたアルミニウム合金押出材からなり、両フランジ１１、１２は互いに平行で同じ厚み（ｃ＝ｄ）、同じ幅（ｅ＝ｆ）を有し、両ウエブ１３、１４は両フランジに垂直で同じ厚み（ｇ＝ｈ）、同じ長さを有する。また、長手方向に垂直な断面において、フランジ１１の両張出幅ｅ１、ｅ２はフランジ１２の両張出幅ｆ１、ｆ２と等しくされ（ｅ１＝ｆ１、ｅ２＝ｆ２）、フランジ１１の中心線ａとフランジ１２の中心線ｂは左右にずれている。なお、中心線ａ、ｂは各フランジ１１、１２の中心（長さの中心）を通り荷重Ｐの方向に引いた直線であり、各フランジ１１、１２に対し垂直である。
両中心線ａ、ｂが左右にずれていることは、曲げの中立軸ｉ及び図心Ｏを通り該曲げの中立軸ｉに垂直な軸ｊのいずれに対しても非対称であることを意味する。そして、上記ドアビームの断面形状は、長手方向に垂直な断面において、図心Ｏを対称中心として対称である。すなわち図心Ｏを中心として１８０゜回転しても同形状となる。 FIG. 1 shows an example of a door beam (cross section perpendicular to the longitudinal direction). This door beam is made of an aluminum alloy extruded material in which a pair of flanges 11 and 12 are connected by a pair of webs 13 and 14, and both the flanges 11 and 12 are parallel to each other and have the same thickness (c = d) and the same width (e = f), and both webs 13, 14 are perpendicular to both flanges and have the same thickness (g = h) and the same length. Further, in the cross section perpendicular to the longitudinal direction, both overhanging widths e 1 and e 2 of the flange 11 are equal to both overhanging widths f 1 and f 2 of the flange 12 (e 1 = f 1 , e 2 = f 2). ), The center line a of the flange 11 and the center line b of the flange 12 are shifted to the left and right. The center lines a and b are straight lines drawn through the centers (length centers) of the flanges 11 and 12 in the direction of the load P, and are perpendicular to the flanges 11 and 12.
The fact that both the center lines a and b are shifted to the left and right means that they are asymmetric with respect to both the neutral axis i of bending and the axis j passing through the centroid O and perpendicular to the neutral axis i of bending. . The sectional shape of the door beam is symmetric with the centroid O as the center of symmetry in a cross section perpendicular to the longitudinal direction. In other words, the same shape is obtained even when the centroid O is rotated by 180 ° around the centroid O.

なお、図５に示すドアビームのように、その断面形状において、両フランジ１、２の幅が異なり（ｅ≠ｆ）、対角上の張出幅が異なり（ｅ１≠ｆ１、ｅ２≠ｆ２）、あるいは厚みが異なる（ｃ≠ｄ）など、断面形状が図心Ｏを中心として対称でない場合は、図４（ａ）に示すように、（１）まず押出材の断面に垂直な面Ａで所定長さに切断し、続いて各々の押出材の両端を斜めの面Ｂ、Ｃで切断する、又は（ｂ）垂直な面Ａで切断することなく、斜めの面Ｂ、Ｃのみで切断する、等の方法を採用している。しかし、いずれの方法でも、図４（ａ）にドットで示した部分が歩留まり落ち（製品に利用されない部分）となり、歩留まりが低下する。 As in the door beam shown in FIG. 5, in the cross-sectional shape, the widths of the flanges 1 and 2 are different (e ≠ f), and the overhanging widths are different (e 1 ≠ f 1 , e 2 ≠ f 2 ), or when the cross-sectional shape is not symmetrical about the centroid O, such as when the thickness is different (c ≠ d), as shown in FIG. 4 (a), (1) first perpendicular to the cross section of the extruded material Cut to a predetermined length at the surface A, and then cut both ends of each extruded material at the oblique surfaces B and C, or (b) only the oblique surfaces B and C without cutting at the vertical surface A A method such as cutting with is adopted. However, in either method, the portion indicated by dots in FIG. 4A becomes a yield drop (a portion not used for a product), and the yield is lowered.

これに対し、図１に示すドアビームは、図４（ｂ）に示すように、上記断面を有する長尺のアルミニウム合金押出材の長手方向に対して傾斜した面Ｂ（断面におけるフランジ１１、１２の幅が最小となる面）と、面Ｂとは逆に傾斜した面Ｃ（同じく断面におけるフランジ１１、１２の幅が最小となる面）で、前記押出材の長手方向に沿ってドアビームの長さ毎に交互に切断する。なお、この押出材では、面Ｂ、Ｃと押出材のフランジ面（フランジ１１、１２の表面）が交わる交線の向きは押出材の長手方向に垂直となる。
この押出材の断面形状は、長手方向に垂直な断面において、図心Ｏを対称中心として対称であるから、切断された各押出材２１、２２、２３、２４・・・は全て同じ断面及び立体形状であり、そのままドアビームとして利用することができ、歩留り落ちが少ない。また、この製造方法によれば切断工程の数が少なくなり、生産性が向上する。 On the other hand, as shown in FIG. 4B, the door beam shown in FIG. 1 has a surface B (of the flanges 11 and 12 in the cross section) inclined with respect to the longitudinal direction of the long aluminum alloy extruded material having the above cross section. The width of the door beam along the longitudinal direction of the extruded material on the surface C having the smallest width) and the surface C inclined oppositely to the surface B (similarly, the surface having the smallest width of the flanges 11 and 12 in the cross section). Cut alternately every time. In this extruded material, the direction of the intersecting line where the surfaces B and C intersect with the flange surfaces of the extruded material (surfaces of the flanges 11 and 12) is perpendicular to the longitudinal direction of the extruded material.
The cross-sectional shape of the extruded material is symmetric about the centroid O in the cross-section perpendicular to the longitudinal direction, so that each of the cut extruded materials 21, 22, 23, 24. It has a shape and can be used as it is as a door beam, with little yield loss. Further, according to this manufacturing method, the number of cutting steps is reduced, and productivity is improved.

図２に示すのは、別のドアビームの例である（同じく長手方向に垂直な断面）。このドアビームは、一対のフランジ３１、３２が一対のウエブ３３、３４により連結されたアルミニウム合金押出材からなり、両フランジ３１、３２は互いに平行で同じ厚み（ｃ＝ｄ）、同じ幅（ｅ＝ｆ）を有し、両ウエブ３３、３４は互いに平行で両フランジに対し同方向に傾斜し同じ厚み（ｇ＝ｈ）、同じ長さを有する。また、長手方向に垂直な断面において、フランジ３１の両張出幅ｅ１、ｅ２はフランジ３２の両張出幅ｆ１、ｆ２と等しくされ（ｅ１＝ｆ１、ｅ２＝ｆ２）、フランジ３１の中心線ａとフランジ３２の中心線ｂは左右にずれている。なお、中心線ａ、ｂは各フランジ３１、３２に対し垂直である。 FIG. 2 shows another example of a door beam (also a cross section perpendicular to the longitudinal direction). This door beam is made of an aluminum alloy extruded material in which a pair of flanges 31 and 32 are connected by a pair of webs 33 and 34. Both flanges 31 and 32 are parallel to each other and have the same thickness (c = d) and the same width (e = f), and both webs 33 and 34 are parallel to each other, inclined in the same direction with respect to both flanges, and have the same thickness (g = h) and the same length. Further, in the cross section perpendicular to the longitudinal direction, both overhanging widths e 1 and e 2 of the flange 31 are made equal to both overhanging widths f 1 and f 2 of the flange 32 (e 1 = f 1 , e 2 = f 2). ), The center line a of the flange 31 and the center line b of the flange 32 are shifted to the left and right. The center lines a and b are perpendicular to the flanges 31 and 32.

このドアビームの断面形状は、曲げの中立軸ｉ及び図心Ｏを通り該曲げの中立軸ｉに垂直な軸ｊに対して非対称である。そして、上記ドアビームの断面形状は、長手方向に垂直な断面において、図心Ｏを対称中心として対称である。すなわち図心Ｏを中心として１８０゜回転しても同形状となる。
なお、このドアビームも、図４（ｂ）に示すように、上記断面形状を有する長尺のアルミニウム合金押出材を切断して製造することができる。 The cross-sectional shape of the door beam is asymmetric with respect to the bending neutral axis i and the axis j passing through the centroid O and perpendicular to the bending neutral axis i. The sectional shape of the door beam is symmetric with the centroid O as the center of symmetry in a cross section perpendicular to the longitudinal direction. In other words, the same shape is obtained even when the centroid O is rotated by 180 ° around the centroid O.
In addition, this door beam can also be manufactured by cutting a long aluminum alloy extruded material having the cross-sectional shape as shown in FIG.

図３に示すのは、本発明に係るドアビームの例である（同じく長手方向に垂直な断面）。このドアビームは、一対のフランジ４１、４２が一対のウエブ４３、４４により連結されたアルミニウム合金押出材からなり、両フランジ４１、４２が湾曲している点で図１に示すドアビームとは異なる。
しかし、図１に示すドアビームと同じく、両フランジ４１、４２は同じ幅及び厚みを有し、両ウエブは互いに平行で同じ長さ及び厚みを有し、押出材の長さ方向に垂直な断面において、フランジ４１の中心線ａとフランジ４２の中心線ｂは左右にずれている。この中心線ａ、ｂは各ウエブ４３、４４と平行である。また、その断面形状は、曲げの中立軸ｉ及び図心Ｏを通り該曲げの中立軸ｉに垂直な軸ｊに対して非対称であり、かつ図心Ｏを対称中心として対称である。すなわち図心Ｏを中心として１８０゜回転しても同形状となる。
このドアビームも、図４（ｂ）に示すように、上記断面形状を有する長尺のアルミニウム合金押出材を切断して製造することができる。 FIG. 3 shows an example of a door beam according to the present invention (also a cross section perpendicular to the longitudinal direction). This door beam is made of an aluminum alloy extruded material in which a pair of flanges 41 and 42 are connected by a pair of webs 43 and 44, and differs from the door beam shown in FIG. 1 in that both flanges 41 and 42 are curved.
However, like the door beam shown in FIG. 1, both flanges 41 and 42 have the same width and thickness, and both webs are parallel to each other and have the same length and thickness, and in a cross section perpendicular to the longitudinal direction of the extruded material. The center line a of the flange 41 and the center line b of the flange 42 are shifted left and right. The center lines a and b are parallel to the webs 43 and 44, respectively. The cross-sectional shape is asymmetric with respect to an axis j passing through the bending neutral axis i and the centroid O and perpendicular to the bending neutral axis i, and is symmetric with respect to the centroid O as the center of symmetry. In other words, the same shape is obtained even if rotated 180 ° about the centroid O.
As shown in FIG. 4B, this door beam can also be manufactured by cutting a long aluminum alloy extruded material having the above cross-sectional shape.

このドアビームはフランジ４１、４２が外側に湾曲しているので、その曲率をドアのアウターパネルの曲率に合わせておけば、接着剤でフランジとアウターパネルの内側を接着する場合に（剛性向上、振動騒音防止等のために予めフランジとアウターパネルを１乃至複数箇所で接着剤を介して接着しておく場合がある）、隙間がほぼ一定であるので接着しやすく有利である。この場合、接着剤とドアビームの密着性を高めるため、ドアビームに表面処理等を適宜行うこともできる。表面処理としては、例えばアルマイト処理、水和酸化物皮膜の形成等が挙げられる。また、フランジ４１、４２が湾曲していることで、実際の荷重方向が想定している方向（中心線ａ、ｂと平行）から多少斜めにずれた場合でも、フランジがその荷重を垂直に受けることができる。   In this door beam, the flanges 41 and 42 are curved outward. Therefore, if the curvature is matched to the curvature of the outer panel of the door, when the inner side of the flange and the outer panel is bonded with an adhesive (increase in rigidity, vibration In some cases, the flange and the outer panel may be bonded in advance through one or more locations to prevent noise, etc.), and since the gap is substantially constant, it is easy to bond. In this case, in order to enhance the adhesiveness between the adhesive and the door beam, the door beam can be appropriately subjected to surface treatment or the like. Examples of the surface treatment include alumite treatment and formation of a hydrated oxide film. Further, since the flanges 41 and 42 are curved, even when the actual load direction is slightly inclined from the assumed direction (parallel to the center lines a and b), the flange receives the load vertically. be able to.

なお、本発明に係るドアビームには、各種アルミニウム合金がいずれも適用できるが、特にＺｎ：４〜９％（質量％、以下同じ）、Ｍｇ：０．８〜２％を含有するＡｌ−Ｚｎ−Ｍｇ系アルミニウム合金、Ｍｇ：０．４〜１．３％、Ｓｉ：０．２〜１．５％を含有するＡｌ−Ｍｇ−Ｓｉ系アルミニウム合金が好適であり、一般的な合金として、例えば７Ｎ０１、６０６１、６０６３、６Ｎ０１等が挙げられる。   Various aluminum alloys can be applied to the door beam according to the present invention. In particular, Al—Zn— containing Zn: 4 to 9% (mass%, the same applies hereinafter) and Mg: 0.8 to 2%. An Mg-based aluminum alloy, an Al-Mg-Si-based aluminum alloy containing Mg: 0.4 to 1.3%, Si: 0.2 to 1.5% is preferable. As a general alloy, for example, 7N01 , 6061, 6063, 6N01 and the like.

ドアビームの断面形状である。It is the cross-sectional shape of a door beam. ドアビームの別の断面形状である。It is another cross-sectional shape of a door beam. 本発明に係るドアビームの断面形状である。It is a cross-sectional shape of the door beam which concerns on this invention. 押出材を切断してドアビームを製造する方法であり、左側の図形はそれぞれの側面図である。It is a method of manufacturing a door beam by cutting an extruded material, and the left figure is a side view of each. ドアビームの断面形状である。It is the cross-sectional shape of a door beam.

符号の説明Explanation of symbols

１ 圧縮側フランジ
２ 引張側フランジ
３、４、１３、１４、３３、３４、４３、４４ ウエブ
１１、１２、３１、３２、４１、４２ フランジ
ａ、ｂ 中心線
Ｏ 図心 1 Compression side flange 2 Tension side flange 3, 4, 13, 14, 33, 34, 43, 44 Web 11, 12, 31, 32, 41, 42 Flange a, b Center line O Centroid

Claims (2)

自動車ドアのアウターパネルの内側に設置されたドアビームにおいて、一対のフランジが互いに平行な一対のウエブにより連結されたアルミニウム合金押出材からなり、長手方向に垂直な断面をみたとき、圧縮側フランジが外側に湾曲し、その曲率をドアのアウターパネルの曲率に合わせたことを特徴とするアルミニウム合金製ドアビーム。 In the door beam installed inside the outer panel of the automobile door, a pair of flanges are made of extruded aluminum alloy connected by a pair of webs parallel to each other. An aluminum alloy door beam characterized in that it is curved to match the curvature of the outer panel of the door. 自動車ドアのアウターパネルの内側に設置されたドアビームにおいて、一対のフランジが互いに平行な一対のウエブにより連結されたアルミニウム合金押出材からなり、長手方向に垂直な断面をみたとき、圧縮側フランジが外側に湾曲し、前記アウターパネルとの隙間がほぼ一定であることを特徴とするアルミニウム合金製ドアビーム。 In the door beam installed inside the outer panel of the automobile door, a pair of flanges are made of extruded aluminum alloy connected by a pair of webs parallel to each other. The aluminum alloy door beam is characterized in that the gap between the outer panel and the outer panel is substantially constant.
JP2006003013A 2006-01-10 2006-01-10 Aluminum alloy door beam and automobile door structure Expired - Lifetime JP4515388B2 (en)

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JP6157682B2 (en) * 2015-08-06 2017-07-05 株式会社神戸製鋼所 Door beam and door beam mounting structure

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