JPH05320809A - Aluminum alloy sheet for automotive body sheet - Google Patents
Aluminum alloy sheet for automotive body sheetInfo
- Publication number
- JPH05320809A JPH05320809A JP4157598A JP15759892A JPH05320809A JP H05320809 A JPH05320809 A JP H05320809A JP 4157598 A JP4157598 A JP 4157598A JP 15759892 A JP15759892 A JP 15759892A JP H05320809 A JPH05320809 A JP H05320809A
- Authority
- JP
- Japan
- Prior art keywords
- aluminum alloy
- sheet
- alloy sheet
- size
- formability
- 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.)
- Pending
Links
Landscapes
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、自動車ボディーシート
として使用されるアルミニウム合金板材に関するもの
で、特に深絞り性、張出し性、曲げ性などの成形性を改
善したものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum alloy sheet material used as an automobile body sheet, and more particularly to an aluminum alloy sheet material having improved formability such as deep drawability, overhangability and bendability.
【0002】[0002]
【従来の技術】自動車部品、車両部品、建材などの板材
を成形して構造用部材として使用されるアルミニウム合
金板材には、強度、成形性、耐食性のバランスが優れて
いることが要求される。このためこれら特性のバランス
に優れたAl−Mg系合金が一般に使用されている。近
年、地球環境保護及び省エネルギーの観点から構造部材
の軽量化の要求が強く、特に従来軟鋼板が使用されてい
た自動車部品のアルミ化が精力的に進められている。し
かし、従来のアルミニウム合金は軟鋼板に比べ成形性が
劣る傾向があり、成形性の良好なアルミニウム合金板材
の開発が急務となっている。2. Description of the Related Art Aluminum alloy sheet materials used as structural members by forming sheet materials such as automobile parts, vehicle parts, and building materials are required to have an excellent balance of strength, formability and corrosion resistance. For this reason, Al-Mg based alloys having a good balance of these properties are generally used. In recent years, there has been a strong demand for reducing the weight of structural members from the viewpoint of protecting the global environment and saving energy, and in particular, automobile parts, which have been conventionally made of mild steel sheet, are being actively made into aluminum. However, conventional aluminum alloys tend to be inferior in formability to mild steel plates, and there is an urgent need to develop aluminum alloy plate materials having good formability.
【0003】[0003]
【発明が解決しようとする課題】従来のアルミニウム合
金板材は、軟鋼板に比べて延性が不足するため成形性が
劣るとされている。そこで延性を阻害する粗大な金属間
化合物を減少させるため、地金純度を高くするか、ある
いはMg含有量を高め、高温で焼鈍することで延性改善
を計っている。しかし両者とも延性は改善されるものの
結晶粒径が粗大化することで、曲げ性においては肌荒れ
が問題となり、あるいは強度が低下することで低潤滑下
での張出し性あるいは深絞り性の大幅な改善にならな
い。また結晶粒の微細化あるいは焼鈍条件の低温化によ
る高強度化を行った場合、延性が不足するため張出し性
が低下するという問題があった。It is said that the conventional aluminum alloy sheet material is inferior in formability due to lack of ductility as compared with the mild steel sheet. Therefore, in order to reduce the coarse intermetallic compound that inhibits the ductility, the purity of the base metal is increased or the Mg content is increased, and the ductility is improved by annealing at high temperature. However, in both cases, although ductility is improved, roughening of the crystal grain size causes a problem of surface roughness in bendability, or strength is reduced, resulting in a significant improvement in overhang or deep drawability under low lubrication. do not become. In addition, when the strength is increased by refining the crystal grains or lowering the annealing conditions, there is a problem that the ductility is insufficient and the overhanging property is reduced.
【0004】[0004]
【課題を解決するための手段】本発明はこれに鑑み種々
検討の結果、高温での焼鈍条件においても、結晶粒径を
粗大化させず、延性を改善し、張出し性、絞り性に優
れ、かつ肌荒れも生じない自動車ボディーシート用アル
ミニウム合金板材を開発したものである。As a result of various studies in view of the above, the present invention does not coarsen the crystal grain size even under annealing conditions at high temperature, improves ductility, is excellent in overhanging property and drawability, In addition, we developed an aluminum alloy sheet material for automobile body sheets that does not cause rough skin.
【0005】本発明の一つは、Mg2〜8wt%を含み、
更にMn0.05〜2.5wt%、Cr0.05〜2.5
wt%、Zr0.05〜2.5wt%、Ti0.05〜2.
5wt%のうち1種又は2種以上を合計2.5wt%以下含
み、残部Alと不可避的不純物からなることを特徴とす
るものである。One of the present inventions comprises 2-8 wt% Mg,
Further, Mn 0.05 to 2.5 wt%, Cr 0.05 to 2.5
wt%, Zr0.05-2.5 wt%, Ti0.05-2.
One of the 5 wt% or two or more of them is contained in a total amount of 2.5 wt% or less, and the balance is Al and inevitable impurities.
【0006】本発明の他の一つは、Mg2〜8wt%を含
み、更にMn0.05〜2.5wt%、Cr0.05〜
2.5wt%、Zr0.05〜2.5wt%、Ti0.05
〜2.5wt%のうち1種又は2種以上を合計2.5wt%
以下を含み、残部Alと不可避的不純物からなる合金に
おいて、その析出物のサイズを2μm以下とすることを
特徴とするものである。Another aspect of the present invention comprises Mg2 to 8 wt%, Mn0.05 to 2.5 wt% and Cr0.05 to
2.5 wt%, Zr0.05-2.5 wt%, Ti0.05
~ 2.5wt% Total of 1 or 2 types 2.5wt%
It is characterized in that the size of the precipitate is 2 μm or less in an alloy containing the following and including the balance Al and unavoidable impurities.
【0007】更に本発明の他の一つは、Mg2〜8wt%
を含み、更にMn0.05〜2.5wt%、Cr0.05
〜2.5wt%、Zr0.05〜2.5wt%、Ti0.0
5〜2.5wt%のうち1種又は2種以上を合計2.5wt
%以下を含み、残部Alと不可避的不純物からなる合金
において、その析出物のサイズを2μm以下とし、かつ
その結晶粒径を20〜60μmとすることを特徴とする
ものである。Still another aspect of the present invention is that Mg2 to 8 wt%
In addition, Mn 0.05-2.5 wt%, Cr0.05
~ 2.5 wt%, Zr0.05-2.5 wt%, Ti0.0
5 wt.% To 2.5 wt.%, 1 or 2 or more in total 2.5 wt.
%, And the balance of Al and unavoidable impurities in the alloy, the size of the precipitate is 2 μm or less, and the crystal grain size is 20 to 60 μm.
【0008】[0008]
【作用】本発明における合金組成を上記の如く限定した
理由について説明する。The reason for limiting the alloy composition in the present invention as described above will be explained.
【0009】Mgは強度を増加し延性も向上させ、成形
性を改善する重要な元素である。しかしてその添加量を
2〜8wt%と限定したのは、2wt%未満では成形性の向
上効果が少なく、8wt%を越えるとその効果が飽和する
とともに工業的に生産が難しくなる。[0009] Mg is an important element that increases strength and ductility, and improves formability. However, the addition amount is limited to 2 to 8% by weight. If it is less than 2% by weight, the effect of improving the formability is small, and if it exceeds 8% by weight, the effect is saturated and industrial production becomes difficult.
【0010】Mn,Cr,Zr,Tiは最終焼鈍におけ
る結晶粒を微細にするとともに、析出物としてマトリッ
クス中に微細均一に存在し、プレス成形等の加工時に回
復組織を形成し、成形性を改善する。しかしてMn0.
05〜2.5wt%、Cr0.05〜2.5wt%、Zr
0.05〜2.5wt%、Ti0.05〜2.5wt%のう
ち1種又は2種以上を合計2.5wt%以下添加するの
は、単独及び複合添加いずれの場合においても0.05
wt%未満では鋳造時の結晶微細化には効果が認められる
ものの本発明の主旨とする成形性の改善効果は十分では
なく、2.5wt%を越えるとその効果が飽和するととも
に溶融温度が高温になるため工業的に生産が難しくな
る。[0010] Mn, Cr, Zr, and Ti make the crystal grains in the final annealing finer, and also exist finely and uniformly in the matrix as precipitates, forming a recovery structure during processing such as press forming, improving the formability. To do. Then Mn0.
05-2.5wt%, Cr0.05-2.5wt%, Zr
0.05 to 2.5 wt% and Ti of 0.05 to 2.5 wt% are added in a total amount of not more than 2.5 wt% by adding one or more of 0.05 and 0.05 in both cases.
If it is less than wt%, the effect of crystal refining at the time of casting is recognized, but the effect of improving the formability, which is the gist of the present invention, is not sufficient. If it exceeds 2.5 wt%, the effect is saturated and the melting temperature is high. Therefore, production becomes difficult industrially.
【0011】また、本発明の目的としているAl−Mg
系合金において、結晶粒微細化あるいは鋳造性などの改
善のため、B,Be及びミッシュメタルの添加は本発明
の効果を阻害しない範囲であれば添加してもかまわな
い。The Al-Mg object of the present invention
In order to improve the grain refinement or the castability in the system alloys, B, Be and Misch metal may be added as long as the effects of the present invention are not impaired.
【0012】次に本発明合金の析出物サイズ及び結晶粒
径の限定理由について説明する。Next, the reasons for limiting the precipitate size and crystal grain size of the alloy of the present invention will be described.
【0013】本発明において合金に微細に存在する析出
物は、結晶粒径の微細化及び加工時の回復組織形成に大
きく寄与する。しかしてそのサイズを2μm以下と限定
したのは、2μmを越える場合転位のピン止め効果が十
分でなく、割れ発生の起点となることから材料の延性を
阻害するという逆効果となりうる。また結晶粒径につい
て20〜60μmと限定したのは、20μm未満の場
合、強度は向上するものの延性が劣化するか、あるいは
成形時にリューダースバンドが発生しやすく、外観上問
題となることがある。また60μmを越える場合表面に
肌荒れが生じやすく、外観不良となることがある。In the present invention, the finely present precipitates in the alloy greatly contribute to the refinement of the crystal grain size and the formation of a recovery structure during working. If the size is limited to 2 μm or less, however, the dislocation pinning effect is not sufficient when the size exceeds 2 μm, and this becomes a starting point of crack generation, which may have an adverse effect of impairing the ductility of the material. The crystal grain size is limited to 20 to 60 μm. When it is less than 20 μm, the strength is improved but the ductility is deteriorated, or Luders band is easily generated during molding, which may cause a problem in appearance. On the other hand, when it exceeds 60 μm, the surface is likely to be roughened and the appearance may be deteriorated.
【0014】[0014]
【実施例】以下本発明を実施例について説明する。表1
に示す組成の合金を水冷鋳造により、厚さ100mm、巾
300mm、長さ250mmの鋳塊とし、その両面を片側あ
たり10mm面削した。これを520℃で12時間均質化
処理した後、450℃で熱間圧延を開始し、厚さ5mmま
で圧延した。これを厚さ1mmまで冷延圧延し、520℃
で1分最終焼鈍を施し、厚さ1mmの試供材とし、機械的
性質、析出物の平均粒子径、結晶粒径を調べると共に、
張出し深さ、絞り深さ、曲げ性、リューダースバンドに
よる外観を調べ、成形性を評価した。機械的性質、析出
物の平均粒子径、結晶粒径を表2に、張出し高さ、絞り
深さ、曲げ性、リューダースバンドによる外観、成形性
の評価を表3に示す。EXAMPLES The present invention will be described below with reference to examples. Table 1
The alloy having the composition shown in (1) was water-cooled to form an ingot having a thickness of 100 mm, a width of 300 mm and a length of 250 mm, and both surfaces thereof were chamfered by 10 mm on each side. This was homogenized at 520 ° C. for 12 hours, and then hot rolling was started at 450 ° C. to roll it to a thickness of 5 mm. Cold rolling this to 1mm thickness, 520 ℃
After 1 minute of final annealing, a test material with a thickness of 1 mm was prepared, and the mechanical properties, average particle size of precipitates, and crystal grain size were examined.
The overhang depth, the drawing depth, the bendability, and the appearance by a Luders band were examined to evaluate the formability. Table 2 shows the mechanical properties, average particle size of precipitates, and crystal grain size. Table 3 shows the overhang height, drawing depth, bendability, appearance by Luders band, and evaluation of formability.
【0015】尚張出し性及び絞り性試験における潤滑油
には10cst のものを使用した。また曲げ性は間隔0mm
の密着曲げを行い、割れ及び肌荒れを目視にて評価し
た。リューダースバンドの発生は引張試験において5%
の歪みを付加した状態で目視により評価した。A lubricating oil of 10 cst was used in the squeezing and drawing tests. The bendability is 0 mm.
The contact bending was performed and cracks and rough skin were visually evaluated. Generation of Luders band is 5% in tensile test
The strain was visually evaluated with the strain added.
【0016】[0016]
【表1】 [Table 1]
【0017】[0017]
【表2】 [Table 2]
【0018】[0018]
【表3】 ・成形条件 張出し性 φ50球頭ポンチ 張出し高さ
は18mm以上が好ましい 絞り性 φ50平頭ポンチ、絞り比2.0 絞り深さは13mm以上が好ましい[Table 3] -Molding conditions Overhanging φ50 ball head punch Overhanging height is preferably 18 mm or more Drawing ability φ50 flat head punch, drawing ratio 2.0 and drawing depth is preferably 13 mm or more
【0019】表1,2,3から明らかなように、本発明
例においては、いずれの試験においてもバランスの良い
特性を示していることが判る。これに対し、比較例 No.
5は結晶粒径が粗大化して肌荒れを生じ、比較例 No.6
は結晶粒径が微細となりすぎたため延性が低下し、成形
性が劣化している。また比較例 No.7は析出物平均粒子
径が大きくなりすぎたために成形性の改善効果が得られ
ず、逆に割れの起点となり、成形性が劣化した。As is clear from Tables 1, 2 and 3, it can be seen that the examples of the present invention show well-balanced characteristics in all tests. On the other hand, Comparative Example No.
In No. 5, the crystal grain size was coarsened to cause rough skin, and Comparative Example No. 6
Since the crystal grain size became too fine, the ductility decreased and the formability deteriorated. In Comparative Example No. 7, the average particle size of the precipitates was too large, so that the effect of improving the moldability was not obtained, and on the contrary, it became the starting point of cracking and deteriorated the moldability.
【0020】[0020]
【発明の効果】本発明によれば、自動車ボディーシート
として使用されるアルミニウム合金板材に張出し性、絞
り性、曲げ性を改善することができる等、産業上非常に
優れた効果を示すものである。EFFECTS OF THE INVENTION According to the present invention, the aluminum alloy plate material used as an automobile body sheet can be improved in overhanging property, drawability and bendability, and has industrially excellent effects. .
───────────────────────────────────────────────────── フロントページの続き (72)発明者 戸次 洋一郎 東京都千代田区丸の内2丁目6番1号 古 河アルミニウム工業株式会社内 (72)発明者 坪田 孝弘 東京都千代田区丸の内2丁目6番1号 古 河アルミニウム工業株式会社内 (72)発明者 東海林 了 東京都千代田区丸の内2丁目6番1号 古 河アルミニウム工業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoichiro Toji 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Aluminum Co., Ltd. (72) Inventor Takahiro Tsubota 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Aluminum Co., Ltd. (72) Inventor Ryo Tokairin 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Aluminum Co., Ltd.
Claims (3)
5〜2.5wt%、Cr0.05〜2.5wt%、Zr0.
05〜2.5wt%、Ti0.05〜2.5wt%のうち1
種又は2種以上を合計2.5wt%以下を含み、残部Al
と不可避的不純物からなることを特徴とする自動車ボデ
ィーシート用アルミニウム合金板材。1. Containing 2 to 8 wt% of Mg, and Mn of 0.0
5 to 2.5 wt%, Cr 0.05 to 2.5 wt%, Zr0.
1 out of 05-2.5 wt% and Ti 0.05-2.5 wt%
Type or two or more types in total, containing less than 2.5 wt%, balance Al
Aluminum alloy sheet material for automobile body sheets, characterized by comprising unavoidable impurities.
5〜2.5wt%、Cr0.05〜2.5wt%、Zr0.
05〜2.5wt%、Ti0.05〜2.5wt%のうち1
種又は2種以上を合計2.5wt%以下を含み、残部Al
と不可避的不純物からなる合金において、その析出物の
サイズを2μm以下とすることを特徴とする自動車ボデ
ィーシート用アルミニウム合金板材。2. It contains Mg 2 to 8 wt%, and further has Mn of 0.0
5 to 2.5 wt%, Cr 0.05 to 2.5 wt%, Zr0.
1 out of 05-2.5 wt% and Ti 0.05-2.5 wt%
Type or two or more types in total, containing less than 2.5 wt%, balance Al
An aluminum alloy sheet material for automobile body sheets, characterized in that the size of its precipitates is 2 μm or less in an alloy consisting of:
5〜2.5wt%、Cr0.05〜2.5wt%、Zr0.
05〜2.5wt%、Ti0.05〜2.5wt%のうち1
種又は2種以上を合計2.5wt%以下を含み、残部Al
と不可避的不純物からなる合金において、その析出物の
サイズを2μm以下とし、かつその結晶粒径を20〜6
0μm以下とすることを特徴とする自動車ボディーシー
ト用アルミニウム合金板材。3. It contains Mg 2 to 8 wt%, and further has Mn of 0.0
5 to 2.5 wt%, Cr 0.05 to 2.5 wt%, Zr0.
1 out of 05-2.5 wt% and Ti 0.05-2.5 wt%
Type or two or more types in total, containing less than 2.5 wt%, balance Al
And an unavoidable impurity, the size of the precipitate is 2 μm or less, and the crystal grain size is 20 to 6
An aluminum alloy sheet material for automobile body sheets, which has a thickness of 0 μm or less.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4157598A JPH05320809A (en) | 1992-05-25 | 1992-05-25 | Aluminum alloy sheet for automotive body sheet |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4157598A JPH05320809A (en) | 1992-05-25 | 1992-05-25 | Aluminum alloy sheet for automotive body sheet |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05320809A true JPH05320809A (en) | 1993-12-07 |
Family
ID=15653216
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4157598A Pending JPH05320809A (en) | 1992-05-25 | 1992-05-25 | Aluminum alloy sheet for automotive body sheet |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05320809A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009098732A1 (en) * | 2008-02-06 | 2009-08-13 | Nippon Light Metal Co., Ltd. | Aluminum alloy sheet for motor vehicle and process for producing the same |
JP2019527299A (en) * | 2016-07-05 | 2019-09-26 | ナノアル エルエルシー | Ribbons and powders from high strength corrosion resistant aluminum alloys |
US11603583B2 (en) | 2016-07-05 | 2023-03-14 | NanoAL LLC | Ribbons and powders from high strength corrosion resistant aluminum alloys |
-
1992
- 1992-05-25 JP JP4157598A patent/JPH05320809A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009098732A1 (en) * | 2008-02-06 | 2009-08-13 | Nippon Light Metal Co., Ltd. | Aluminum alloy sheet for motor vehicle and process for producing the same |
US9695495B2 (en) | 2008-02-06 | 2017-07-04 | Nippon Light Metal Co., Ltd. | Process for producing an aluminum alloy sheet for motor vehicle |
JP2019527299A (en) * | 2016-07-05 | 2019-09-26 | ナノアル エルエルシー | Ribbons and powders from high strength corrosion resistant aluminum alloys |
US11603583B2 (en) | 2016-07-05 | 2023-03-14 | NanoAL LLC | Ribbons and powders from high strength corrosion resistant aluminum alloys |
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