JP3241184B2 - Extruded material - Google Patents
Extruded materialInfo
- Publication number
- JP3241184B2 JP3241184B2 JP22389893A JP22389893A JP3241184B2 JP 3241184 B2 JP3241184 B2 JP 3241184B2 JP 22389893 A JP22389893 A JP 22389893A JP 22389893 A JP22389893 A JP 22389893A JP 3241184 B2 JP3241184 B2 JP 3241184B2
- Authority
- JP
- Japan
- Prior art keywords
- face plate
- rib
- thickness
- extruded
- shaped intersection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Extrusion Of Metal (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車用バンパー材等
に用いられる金属製の押出型材に関し、より詳しくは曲
げ加工に適した形状を有する押出型材に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal extrusion material used for a bumper material for automobiles, and more particularly to an extrusion material having a shape suitable for bending.
【０００２】[0002]
【従来の技術】近年、車体重量の軽量化等の要請から、
自動車のバンパー材、サイドビーム、ボウルーフ等とし
てアルミニウムまたはアルミニウム合金製の押出型材が
広く用いられつつある。この押出型材は、図４に示すい
わゆる日字型や図５に示すような目字型をなすもので、
上記バンパー材の外観形状をなす筒状の面板１と、この
面板内にあってこの面板１を補強するためのリブ２とが
一体に押出成形されたものである。2. Description of the Related Art In recent years, there has been a demand for reducing the weight of a vehicle body and the like.
BACKGROUND ART Extrusion members made of aluminum or aluminum alloy are being widely used as bumper materials, side beams, bowls, and the like for automobiles. This extruded material has a so-called Japanese character shape as shown in FIG. 4 and an eye shape as shown in FIG.
A cylindrical face plate 1 having the appearance of the bumper material and a rib 2 for reinforcing the face plate 1 in the face plate are integrally formed by extrusion molding.
【０００３】この押出型材は、図４および図５に示すよ
うに、上記バンパー等の形状にしたがって、一般に上記
面板１と上記リブ２とのＴ字状をなす交差部３、３の一
方が引張り荷重を受け、かつ他方が圧縮荷重を受ける方
向に曲げ加工される。ちなみに、このような曲げ加工を
行なう場合には、まず押出型材の中空部分に金属製の中
子を入れ、ついで上記押出型材を所望の製品形状となる
ように、上述した方向に曲げ加工を行なっている。As shown in FIGS. 4 and 5, according to the shape of the bumper or the like, one of the T-shaped intersections 3, 3 of the face plate 1 and the ribs 2 is generally pulled. It is bent in the direction in which it receives a load and the other receives a compressive load. By the way, when performing such a bending process, first, a metal core is inserted into the hollow portion of the extruded die, and then the extruded die is bent in the above-described direction so as to have a desired product shape. ing.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記押
出型材を曲げ加工しようとすると、特にアルミニウムや
アルミニウム合金製の押出型材にあっては、中子を入れ
て上記曲げ加工をしても、加工時に加わる引張り応力お
よび圧縮応力により、リブ２にしわが生じたり、あるい
はＴ字状の交差部３近傍の面板１に亀裂等が生じやすい
という問題点があった。このため、従来上記押出型材の
寸法を設定するにあたっては、加工メーカーのノウハウ
に従って曲げ加工が可能な形状を選定したり、あるいは
予め複数の寸法形状の押出型材を作成し、これらを用い
て実際に曲げ試験を行なうことにより形状の設定をして
おり、これら形状の設定や曲げ加工等の条件設定に多大
の時間を要するという問題があった。However, when trying to bend the above-mentioned extruded material, especially in the case of an extruded material made of aluminum or an aluminum alloy, even if the above-mentioned bending is carried out by inserting a core, it is difficult to bend at the time of working. There is a problem that the tensile stress and the compressive stress applied cause the ribs 2 to be wrinkled or the face plate 1 near the T-shaped intersection 3 to be easily cracked. For this reason, in setting the dimensions of the above-described extrusion die, conventionally, a shape that can be bent is selected according to the know-how of a processing maker, or an extrusion die having a plurality of dimensions and shapes is prepared in advance, and these are actually used by using these. The shape is set by performing a bending test, and there is a problem that it takes a lot of time to set these shapes and set conditions such as bending.
【０００５】そこで、本発明者等は、中子を用いた押出
型材を曲げ加工するに際して、リブにおけるしわの発生
を抑え、かつ面板の亀裂を無くすための曲げ加工性に優
れた上記押出型材の形状について鋭意研究を行なったと
ころ、押出型材の面板とリブとのＴ字状をなす交差部の
寸法や形状が、上記しわや亀裂の発生に重要な影響を及
ぼすことが判明した。[0005] In view of the above, the present inventors have found that, when bending an extruded die using a core, the extruded die which is excellent in bending workability for suppressing the generation of wrinkles in ribs and eliminating cracks in the face plate. As a result of intensive studies on the shape, it was found that the size and shape of the T-shaped intersection between the face plate and the rib of the extruded material had an important effect on the occurrence of wrinkles and cracks.
【０００６】そして、少なくとも上記Ｔ字状の交差部に
おける上記面板の厚さｔ1 と、上記リブの厚さｔ2 と
を、 ｔ1／ｔ2 ≧ １．１ ……(1) とすると、上記Ｔ字状交差部に生じる最大応力が低減化
して、しわや亀裂等の発生を抑えることができるという
知見を得るに至った。At least the thickness t 1 of the face plate and the thickness t 2 of the rib at the T-shaped intersection are defined as t 1 / t 2 ≧ 1.1 (1) It has been found that the maximum stress generated at the T-shaped intersection is reduced, and the occurrence of wrinkles and cracks can be suppressed.
【０００７】そして、さらに、上記(1) 式に加えて、面
板の厚さｔ1 と、この面板と上記リブとのＴ字状をなす
交差部におけるコーナー半径Ｒとを、 ０．５ｔ1 ≦ Ｒ ≦ ４ｔ1 ……(2) とすると、単に板厚を上記(1) 式の関係にした場合より
も、一層面板の上記Ｔ字状交差部近傍において亀裂が生
じなくなることが判った。Further, in addition to the above equation (1), the thickness t 1 of the face plate and the corner radius R at the T-shaped intersection of the face plate and the rib are set as follows: 0.5t 1 ≦ When R ≦ 4t 1 (2), it was found that cracks did not occur in the vicinity of the T-shaped intersection of the face plate as compared with the case where the plate thickness was simply set to the relationship of the above formula (1).
【０００８】[0008]
【課題を解決するための手段】本発明は、このような知
見に基づいてなされたもので、請求項１に記載の押出型
材は、筒状をなす面板と、この面板間を連結する少なく
とも１の補強用リブとが一体に押出し成形され、面板と
リブとのＴ字状をなす交差部の一方が引張り荷重を受
け、かつ他方が圧縮荷重を受ける方向に曲げ加工される
押出型材の、少なくとも上記Ｔ字状の交差部における面
板の厚さｔ1 と、リブの厚さｔ2 とを、 ｔ1／ｔ2 ≧ １．１ としたものである。SUMMARY OF THE INVENTION The present invention has been made based on such findings, and the extrusion die according to the first aspect has a cylindrical face plate and at least one connecting plate between the face plates. And at least one of the extruded mold members in which one of the T-shaped intersections of the face plate and the rib is subjected to a tensile load and the other is bent in a direction to receive the compressive load. The thickness t 1 of the face plate and the thickness t 2 of the rib at the T-shaped intersection are t 1 / t 2 ≧ 1.1.
【０００９】また、請求項２に記載の押出型材は、請求
項１に記載の押出型材の上記面板の厚さｔ1 と、この面
板と上記リブとのＴ字状をなす交差部におけるコーナー
半径Ｒとを、 ０．５ｔ1 ≦ Ｒ ≦ ４ｔ1 としたものである。According to a second aspect of the present invention, there is provided an extrusion die according to the first aspect, wherein the thickness t 1 of the face plate of the extrusion die according to the first aspect and a corner radius at a T-shaped intersection between the face plate and the rib. R is defined as 0.5t 1 ≦ R ≦ 4t 1 .
【００１０】さらに、請求項３に記載の押出型材は、請
求項１または２に記載のものが、アルミニウムまたはア
ルミニウム合金からなることを特徴とするものである。[0010] Further, the extrusion member according to the third aspect is characterized in that the extrusion member according to the first or second aspect is made of aluminum or an aluminum alloy.
【００１１】[0011]
【作用】請求項１に記載の押出型材によれば、上記Ｔ字
状の交差部における最大応力が小さくなり、曲げ加工性
が向上する。これを図２に基づいて説明すると、図２は
面板の厚さｔ1とリブの厚さｔ2とを各々変化させて、そ
の時のＴ字状交差部に生じる最大応力を示したものであ
る。図２において、ｔ1／ｔ2 が１.１以上の範囲では最
大応力が小さく、かつｔ1／ｔ2 が１.１未満では、急激
に最大応力が大きくなる。According to the extrusion member of the first aspect, the maximum stress at the T-shaped intersection is reduced, and the bending workability is improved. This will be described with reference to FIG. 2. FIG. 2 shows the maximum stress generated at the T-shaped intersection at that time by changing the thickness t 1 of the face plate and the thickness t 2 of the rib. . In FIG. 2, the maximum stress is small when t 1 / t 2 is 1.1 or more, and the maximum stress is sharply increased when t 1 / t 2 is less than 1.1.
【００１２】したがって、上記ｔ1／ｔ2 を１.１以上と
することにより、曲げ加工時に面板の高い強度に対して
リブが伸びるため、リブのしわが減少して、面板の亀裂
も減少する。この結果、上記押出型材の曲げ加工性が向
上して、不良品の発生を抑えることができる。Therefore, when the ratio t 1 / t 2 is set to 1.1 or more, the ribs are elongated with respect to the high strength of the face plate during bending, so that the wrinkles of the ribs are reduced and the cracks of the face plate are also reduced. . As a result, the bending workability of the extruded mold material is improved, and occurrence of defective products can be suppressed.
【００１３】また、請求項２に記載の押出型材にあって
は、上記Ｔ字状の交差部における最大応力がより一層小
さくなる。すなわち、図３は上記(1) 式の条件のもとで
コーナー半径Ｒの値を変えた場合の最大応力値を示すも
のであり、同図から、コーナー半径Ｒが面板厚さｔ1 に
対して上記範囲にある場合に、最大応力値がより小さく
なる。したがって、請求項１に記載の押出型材を、さら
に請求項２に記載のように設定することにより、一層面
板のＴ字状交差部において亀裂が生じないものとなる。Further, in the extrusion member according to the second aspect, the maximum stress at the T-shaped intersection is further reduced. That is, FIG. 3 shows the maximum stress value when the value of the corner radius R is changed under the condition of the above equation (1). From the figure, it can be seen that the corner radius R is different from the face plate thickness t 1. When it is in the above range, the maximum stress value becomes smaller. Therefore, by setting the extruded die according to the first aspect as described in the second aspect, a crack is not generated at the T-shaped intersection of the face plate.
【００１４】よって、請求項３に記載のように、特に上
記押出型材をアルミニウムまたはアルミニウム合金によ
って成形した場合に好適である。[0014] Therefore, as described in claim 3, it is particularly suitable when the extruded material is formed of aluminum or an aluminum alloy.
【００１５】[0015]
【実施例】本発明に係る押出型材の作用効果を確認する
ために、下記の実験を行なった。まず、図１に示すよう
な、いずれも面板の寸法が縦１００ｍｍ×横７５ｍｍ×
長さ１３００ｍｍである日字型のアルミニウム製の押出
型材であって、面板１１の厚さｔ1 およびリブ１２の厚
さｔ2 を変えたものを複数準備した。ついで、これらの
押出型材の中空部内に中子を入れてプレス機により角度
３０度の曲げ加工試験を行なった。表１は、各々同表中
に示す面板１１の厚さｔ1 およびリブ１２の厚さｔ2 の
押出型材についての曲げ加工試験の結果を示すものであ
る。EXAMPLES The following experiments were conducted to confirm the effects of the extrusion material according to the present invention. First, as shown in FIG. 1, the dimensions of each face plate are 100 mm long × 75 mm wide ×
A plurality of extruded aluminum-shaped extruded aluminum members having a length of 1300 mm and having different thicknesses t 1 of the face plate 11 and thicknesses t 2 of the ribs 12 were prepared. Next, a core was put into the hollow portion of these extruded members, and a bending test at an angle of 30 ° was performed by a press machine. Table 1 shows the results of a bending test on an extruded die having a thickness t 1 of the face plate 11 and a thickness t 2 of the rib 12 shown in the table.
【００１６】 ○印は曲げ加工性良い。 △印は曲げ加工後の形状が悪い。 ×印は亀裂が入る。[0016] ○ mark shows good bending workability. The mark “Δ” has a bad shape after bending. The crosses indicate cracks.
【００１７】表１から、上記ｔ1／ｔ2 を１.１以上とす
ることにより、曲げ加工時に面板１１の高い強度に対し
てリブ１２が伸びるため、リブ１２のしわが減少して、
面板の亀裂も減少し、この結果押出型材の曲げ加工性が
向上していることが判る。From Table 1, when the ratio t 1 / t 2 is set to 1.1 or more, the ribs 12 expand with respect to the high strength of the face plate 11 during bending, so that the wrinkles of the ribs 12 are reduced.
It can be seen that the cracks in the face plate are also reduced, and as a result, the bending workability of the extruded die is improved.
【００１８】つぎに、同様のアルミニウム製の押出型材
であって、リブ１２の厚さｔ2 を１.８ｍｍとし、かつ
面板１１の厚さｔ1およびＴ字状交差部１３のコーナー
Ｒを変えたものを複数用意した。そして、これらの押出
型材についても、同様の曲げ加工試験を行なった。表２
は、上記試験の結果を示すものである。Next, a similar aluminum extruded material is used, in which the thickness t 2 of the rib 12 is 1.8 mm, the thickness t 1 of the face plate 11 and the corner R of the T-shaped intersection 13 are changed. Were prepared. The same bending test was performed on these extruded mold members. Table 2
Shows the results of the above test.
【００１９】表２から、コーナー半径Ｒが面板厚さｔ1
に対して、 ０．５ｔ1 ≦ Ｒ ≦ ４ｔ1 の範囲にある場合に、最大応力値がより小さくなり、こ
の結果面板１１のＴ字状交差部１３において一層亀裂が
生じないものとなることが判る。From Table 2, it can be seen that the corner radius R is equal to the face plate thickness t 1.
On the other hand, when it is in the range of 0.5t 1 ≦ R ≦ 4t 1 , the maximum stress value becomes smaller, and as a result, cracks are less likely to occur in the T-shaped intersection 13 of the face plate 11. I understand.
【００２０】 リブ厚さｔ2=１．８ ◎印は曲げ加工性良い。 ×印は亀裂が入る。[0020] Rib thickness t 2 = 1.8 The mark ◎ indicates good bending workability. The crosses indicate cracks.
【００２１】[0021]
【発明の効果】以上説明したように、本発明の押出型材
によれば、特にアルミニウムまたはアルミニウム合金
で、筒状をなす面板とこの面板間を連結する少なくとも
１の補強用リブとが一体に押出し成形されて、上記面板
と上記リブとのＴ字状をなす交差部の一方が引張り荷重
を受け、かつ他方が圧縮荷重を受ける方向に曲げ加工さ
れる押出型材を成形した場合においても、曲げ加工性が
向上し、よって多数の実験等によって形状を設定する等
の手間を要することなく、容易に上記Ｔ字状の交差部に
おいてリブにしわが生じたり、あるいは上記交差部近傍
の面板に亀裂が生じたりすることのない押出型材を得る
ことができる。As described above, according to the extruded die of the present invention, a tubular face plate and at least one reinforcing rib connecting the face plates are integrally extruded, particularly of aluminum or aluminum alloy. Even when an extruded material is formed and one of the T-shaped intersections of the face plate and the rib receives a tensile load and the other is bent in a direction to receive a compressive load, the bending process is performed. Therefore, the ribs are easily wrinkled at the T-shaped intersections, or cracks are generated in the face plate near the intersections, without the need for setting the shape by a large number of experiments or the like. It is possible to obtain an extruded material that is free from rubbing.
【図１】本発明の押出型材の一実施例を示す側断面図で
ある。FIG. 1 is a side sectional view showing one embodiment of an extrusion die according to the present invention.
【図２】本発明の作用効果を説明するためのグラフであ
る。FIG. 2 is a graph for explaining the operation and effect of the present invention.
【図３】本発明の作用効果を説明するためのグラフであ
る。FIG. 3 is a graph for explaining the operation and effect of the present invention.
【図４】従来の押出型材の形状を示す側断面図である。FIG. 4 is a side sectional view showing the shape of a conventional extrusion die.
【図５】従来の他の押出型材の形状を示す側断面図であ
る。FIG. 5 is a side sectional view showing the shape of another conventional extrusion die.
１１ 面板 １２ リブ １３ Ｔ字状の交差部 11 face plate 12 rib 13 T-shaped intersection
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平５−220534（ＪＰ，Ａ) 特開 平３−27833（ＪＰ，Ａ) 特開 平６−198327（ＪＰ，Ａ) 特開 平６−142754（ＪＰ，Ａ) 特開 昭59−113164（ＪＰ，Ａ) 特開 平２−30328（ＪＰ，Ａ) 特開 昭60−33178（ＪＰ，Ａ) 実開 昭50−69824（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B21C 23/14 B21D 7/00 B21D 9/00 B60R 19/03 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-220534 (JP, A) JP-A-3-27833 (JP, A) JP-A-6-198327 (JP, A) JP-A-6-198327 142754 (JP, A) JP-A-59-113164 (JP, A) JP-A-2-30328 (JP, A) JP-A-60-33178 (JP, A) Japanese Utility Model Laid-Open No. 50-69824 (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) B21C 23/14 B21D 7/00 B21D 9/00 B60R 19/03
Claims (3)
る少なくとも１の補強用リブとが一体に押出し成形され
てなり、上記面板と上記リブとのＴ字状をなす交差部の
一方が引張り荷重を受け、かつ他方が圧縮荷重を受ける
方向に曲げ加工される押出型材において、 少なくとも上記Ｔ字状の交差部における上記面板の厚さ
ｔ1 と、上記リブの厚さｔ2 とを、 ｔ1／ｔ2 ≧ １．１ としたことを特徴とする押出型材。1. A cylindrical face plate and at least one reinforcing rib connecting the face plates are integrally extruded and formed, and one of T-shaped intersections between the face plate and the rib is provided. Is subjected to a tensile load, and the other is bent in a direction to receive a compressive load, wherein at least the thickness t 1 of the face plate and the thickness t 2 of the rib at the T-shaped intersection are defined by: , T 1 / t 2 ≧ 1.1.
ブとのＴ字状をなす交差部におけるコーナー半径Ｒと
を、 ０．５ｔ1 ≦ Ｒ ≦ ４ｔ1 としたことを特徴とする請求項１に記載の押出型材。2. The method according to claim 1, wherein a thickness t 1 of the face plate and a corner radius R at a T-shaped intersection between the face plate and the rib are 0.5t 1 ≦ R ≦ 4t 1. The extrusion die according to claim 1, wherein
はアルミニウム合金により一体に押出し成形されてなる
ことを特徴とする請求項１または請求項２に記載の押出
型材。3. The extrusion die according to claim 1, wherein the face plate and the rib are integrally extruded from aluminum or an aluminum alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22389893A JP3241184B2 (en) | 1993-08-18 | 1993-08-18 | Extruded material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22389893A JP3241184B2 (en) | 1993-08-18 | 1993-08-18 | Extruded material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0751738A JPH0751738A (en) | 1995-02-28 |
| JP3241184B2 true JP3241184B2 (en) | 2001-12-25 |
Family
ID=16805438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22389893A Expired - Lifetime JP3241184B2 (en) | 1993-08-18 | 1993-08-18 | Extruded material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3241184B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3387739B2 (en) * | 1996-06-14 | 2003-03-17 | 株式会社神戸製鋼所 | Aluminum or aluminum alloy bending member, bending method and bending mold |
-
1993
- 1993-08-18 JP JP22389893A patent/JP3241184B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0751738A (en) | 1995-02-28 |
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