JPH04173942A - Production of automotive panel material - Google Patents
Production of automotive panel materialInfo
- Publication number
- JPH04173942A JPH04173942A JP30192890A JP30192890A JPH04173942A JP H04173942 A JPH04173942 A JP H04173942A JP 30192890 A JP30192890 A JP 30192890A JP 30192890 A JP30192890 A JP 30192890A JP H04173942 A JPH04173942 A JP H04173942A
- Authority
- JP
- Japan
- Prior art keywords
- strength
- heat treatment
- automotive panel
- present
- alloy sheet
- 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
- 239000000463 material Substances 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 6
- 229910018464 Al—Mg—Si Inorganic materials 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 3
- 229910021365 Al-Mg-Si alloy Inorganic materials 0.000 abstract 2
- 238000009740 moulding (composite fabrication) Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
Landscapes
- Body Structure For Vehicles (AREA)
Abstract
Description
（産業上の利用分野）
本発明は、自動車パネル材の製造方法に係り、より詳し
くは、成形性に優れた高強度自動車パネル材の製造方法
に関するものである。
（従来の技術及び解決しようとする課題）従来、自動車
用パネル材等に使用されているＡｌ−Ｍｇ−８ｉ系アル
ミニウム合金板は、Ｔ６処理として１７０〜１８０℃で
約８時間の処理を施すことによって十分な強度が得られ
るが、この処理には長時間を要するので、自動車パネル
材等の生産ラインでは生産性の困難さやコスト高などの
問題点があるため、あまり用いられていない。
また、このＡｌ−Ｍｇ−８ｉ系アルミニウム合金板の製
造法においては、成形性を重視して強度を低くすると、
塗装焼付時の加熱処理を利用したとしても十分に強度を
上げることができず、一方、焼付硬化後の強度を重視し
て強度を高くすると、成形加工時の強度を高くせざるを
得ぬため、成形加工が劣るなど、相反する特性（成形性
、焼付硬化性）を同時に向上させることが極めて困難で
あった・
本発明は、上記技術技術の問題点を解決して、成形性を
重視して強度の低いＡｌ−Ｍｇ−８ｉ系アルミニウム合
金を使用しても、高強度を確保できる自動車パネル材の
製造方法を提供することを目的とするものである。
（課題を解決するための手段）
前記課題を解決するため、発明者らは、ＡＩ２−Ｍｇ−
８ｉ系アルミニウム合金板を用いて高成形性と高強度を
共に満足できる自動車用パネル材の製造条件について鋭
意研究を行った結果、強度の低いＡｌ−Ｍｇ−８ｉ系ア
ルミニウム合金板を用いてこれを成形加工した後に所定
条件の加熱処理を施すことにより、成形後の自動車パネ
ル材の強度を著しく向上できる方法を見い出したもので
ある。
すなわち、本発明は、Ｍｇ： ０ 、３〜１．０％及び
Ｓｉ：０．６〜２．０％を、Ｍｇ／Ｓｉ比が１以下で含
有するＡｌ−Ｍｇ−８ｉ系アルミニウム合金の溶体化処
理材を成形加工した後、１８５〜２２０℃の範囲で２０
〜６０分の加熱処理を施すことを特徴とする高成形で且
つ高強度の自動車パネル材の製造方法を要旨とするもの
である。
以下に本発明を更に詳述する。
（作用）
まず、本発明における化学成分の限定理由について説明
する。
Ｍｇ：
ＭｇはＳｉと共同して強度を付与する元素であるが、０
．３％未満では加熱処理を施した後の強度が低くなり、
一方、１．０％を超えると伸びが低くなり、靭性が劣る
。よって、Ｍｇ量は０．３〜１゜０％の範囲とする。
Ｓｉ：
ＳｉはＭｇと共同して強度を付与する元素である。
しかし、０．６％未満では加熱処理を施した後の強度が
低下し、一方、２．０％を超えると伸びが低くなり、靭
性が劣る。よって、Ｓｉ量は０．６〜２．０％の範囲と
する。
但し、Ｍｇ量とＳｉ量の比（Ｍｇ／Ｓｉ）が１以下とな
るように成分調整する必要がある。これは、この比が１
より大きいと、加熱処理を施しても十分に強度が上がら
ず、また加熱処理前のＴ４状態での放置により成形性が
劣るためである。
なお、必要に応じて、この種の用途に供されるＡｌ−Ｍ
ｇ−８Ｌ系アルミニウム合金に通常添加される他の成分
を適宜添加してもよい。例えば、Ｃｕ、Ｍｎ、Ｃｒ、Ｚ
ｒ、Ｔｉ、Ｆｅ等である。しかし、これらには許容量が
あり、Ｃｕは多くなると耐食性が劣るので０．８％以下
とし、Ｍｎ、 Ｃｒ、Ｚｒ、Ｔｉ、Ｆｅは、それぞれ多
くなると成形性が劣るので、Ｍｎは０．８％以下、Ｃｒ
は０．２％以下、Ｚｒは０．２％以下、Ｔｉは０．１％
以下、Ｆｅは０．５％以下で許容される。
次に、本発明の製造条件を説明する。
まず、本発明では、上記化学成分を有するＡｌ−Ｍｇ−
８ｉ系アルミニウム合金に溶体化処理を施した材料を成
形加工に使用することを必須とするものである。このＡ
ｌ−Ｍｇ−５ｉ系アルミニウム合金に溶体化処理を施し
た素材は強度が低いため。
成形性がよい。溶体化処理条件は特に制限する必要はな
く、例えば、４８０〜ｂ
０秒の条件が挙げられる。
次いで、成形加工後に特定条件の加熱処理を施すことに
より高強度を確保することができる。しかし、加熱温度
が１８５℃未満では低温すぎるために強度向上の効果が
少なく、また２２０’Ｃを超えると過時効となって強度
が低下する。したがって、加熱温度条件は１８５〜２２
０’Ｃの範囲とする。更に、この温度での保持時間が２
０分未満では十分な焼付硬化性が得られず、また６０分
を超えると過時効となって焼付硬化性が低下する。した
がって、保持時間は２ｏ〜６０分の範囲とする。
次に本発明の実施例を示す。
（実施例）
第１表に示す化学成分を有するアルミニウム合金板（板
厚１ 、０ ｍｍ）に５５０’ＣＸ ２０秒→空冷（冷
却速度３８０℃／ｗｉｎ）の溶体化処理を施した。
この溶体化処理材について成形性を調べた結果を第１表
に併記する。
第１表から明らかなように、本発明例Ｎｃｉｌ〜＆４は
いずれも、比較例＆５〜＆７に比べ、成形性に優れた材
料であることがわかる。
次いで、各溶体化処理材に対し、第２表に示す条件の加
熱処理を施し、加熱処理後の強度を調べた。その結果を
第２表に併記する。なお、加熱処理前の強度も併記する
。
第２表より明らかなように、本発明の加熱温度及び保持
時間範囲で加熱処理を施すことにより、強度を著しく向
上できることがわかる。
一方、比較例では、化学成分が本発明範囲外の場合、加
熱処理条件が本発明範囲内であっても、焼付硬化性が不
足し、加熱処理前後の強度差が小さい。また、化学成分
が本発明範囲内であっても、加熱処理条件が本発明範囲
外のため、同様に強度向上の効果が小さい。勿論、化学
成分及び加熱処理条件の双方が本発明範囲外の場合も、
同様に強度向上の効果が小さい。(Industrial Application Field) The present invention relates to a method for manufacturing an automobile panel material, and more particularly, to a method for manufacturing a high-strength automobile panel material with excellent formability. (Prior art and problems to be solved) Conventionally, Al-Mg-8i aluminum alloy sheets used for automobile panel materials, etc. are subjected to T6 treatment at 170 to 180°C for about 8 hours. Although sufficient strength can be obtained by this method, this treatment requires a long time, and therefore it is not used very often on production lines for automobile panel materials, etc., due to problems such as difficulty in productivity and high cost. In addition, in the manufacturing method of this Al-Mg-8i-based aluminum alloy plate, if the strength is lowered with emphasis on formability,
Even if heat treatment is used during paint baking, it is not possible to sufficiently increase the strength.On the other hand, if you emphasize the strength after baking and hardening, you will have no choice but to increase the strength during molding. However, it was extremely difficult to simultaneously improve contradictory properties (formability and bake hardenability), such as poor moldability.The present invention solves the above technical problems and places emphasis on moldability. An object of the present invention is to provide a method for manufacturing an automobile panel material that can ensure high strength even when using an Al-Mg-8i-based aluminum alloy, which has low strength. (Means for Solving the Problems) In order to solve the above problems, the inventors developed AI2-Mg-
As a result of intensive research into the manufacturing conditions for automobile panel materials that can satisfy both high formability and high strength using 8i-based aluminum alloy sheets, we have found that this can be achieved using low-strength Al-Mg-8i-based aluminum alloy sheets. We have discovered a method that can significantly improve the strength of a molded automobile panel material by subjecting it to heat treatment under predetermined conditions after molding. That is, the present invention relates to solution treatment of an Al-Mg-8i-based aluminum alloy containing Mg: 0, 3 to 1.0% and Si: 0.6 to 2.0% at a Mg/Si ratio of 1 or less. After forming the treated material, it is heated at a temperature of 185 to 220℃ for 20 minutes.
The gist of the present invention is a method for manufacturing a highly moldable and high-strength automobile panel material, which is characterized by subjecting it to heat treatment for ~60 minutes. The present invention will be explained in further detail below. (Function) First, the reason for limiting the chemical components in the present invention will be explained. Mg: Mg is an element that cooperates with Si to impart strength, but 0
．． If it is less than 3%, the strength after heat treatment will be low,
On the other hand, if it exceeds 1.0%, the elongation will be low and the toughness will be poor. Therefore, the Mg amount is set in the range of 0.3 to 1.0%. Si: Si is an element that works together with Mg to impart strength. However, if it is less than 0.6%, the strength after heat treatment will decrease, while if it exceeds 2.0%, the elongation will be low and the toughness will be poor. Therefore, the amount of Si is set in the range of 0.6 to 2.0%. However, it is necessary to adjust the components so that the ratio of the amount of Mg to the amount of Si (Mg/Si) is 1 or less. This means that this ratio is 1
This is because if the size is larger, the strength will not increase sufficiently even if heat treatment is performed, and moldability will be poor due to being left in the T4 state before heat treatment. In addition, if necessary, Al-M for this type of use may be used.
Other components normally added to g-8L aluminum alloys may be added as appropriate. For example, Cu, Mn, Cr, Z
r, Ti, Fe, etc. However, there is a tolerance for these, and as Cu deteriorates in corrosion resistance when it increases, it should be 0.8% or less, and Mn, Cr, Zr, Ti, and Fe deteriorate in formability when they increase, so Mn should be 0.8% or less. % or less, Cr
is 0.2% or less, Zr is 0.2% or less, Ti is 0.1%
Hereinafter, Fe is allowed at 0.5% or less. Next, the manufacturing conditions of the present invention will be explained. First, in the present invention, Al-Mg-
It is essential to use a material obtained by subjecting an 8i-based aluminum alloy to solution treatment for molding. This A
This is because the strength of l-Mg-5i aluminum alloy solution treated material is low. Good moldability. There is no need to particularly limit the solution treatment conditions, and examples include conditions of 480 to b 0 seconds. Next, high strength can be ensured by applying heat treatment under specific conditions after the molding process. However, if the heating temperature is less than 185° C., the temperature is too low and the effect of improving strength is small, and if it exceeds 220° C., over-aging occurs and the strength decreases. Therefore, the heating temperature condition is 185-22
The range is 0'C. Furthermore, the holding time at this temperature is 2
If it is less than 0 minutes, sufficient bake hardenability cannot be obtained, and if it exceeds 60 minutes, it will become over-aged and the bake hardenability will decrease. Therefore, the holding time is in the range of 20 to 60 minutes. Next, examples of the present invention will be shown. (Example) An aluminum alloy plate (thickness: 1 mm, 0 mm) having the chemical components shown in Table 1 was subjected to solution treatment at 550'CX for 20 seconds → air cooling (cooling rate: 380° C./win). Table 1 also shows the results of investigating the formability of this solution-treated material. As is clear from Table 1, the present invention examples Ncil to &4 are all materials with excellent moldability compared to the comparative examples &5 to &7. Next, each of the solution-treated materials was subjected to heat treatment under the conditions shown in Table 2, and the strength after the heat treatment was examined. The results are also listed in Table 2. Note that the strength before heat treatment is also listed. As is clear from Table 2, it can be seen that the strength can be significantly improved by performing heat treatment within the heating temperature and holding time ranges of the present invention. On the other hand, in the comparative example, when the chemical components are outside the range of the present invention, the bake hardenability is insufficient even if the heat treatment conditions are within the range of the present invention, and the difference in strength before and after the heat treatment is small. Further, even if the chemical components are within the range of the present invention, the heat treatment conditions are outside the range of the present invention, so the strength improvement effect is similarly small. Of course, even if both the chemical components and heat treatment conditions are outside the scope of the present invention,
Similarly, the effect of improving strength is small.
（発明の効果）
以上詳述したように、本発明によれば、成形加工が容易
で、且つ成形加工後に加熱処理を行うことにより高強度
の自動車パネル材を得ることができる。この加熱処理は
、従来のＴ６処理と異なり、比較的短時間の熱処理であ
るので、省エネルギーにもなり、更には、加熱処理後の
高強度化により、アルミニウム合金板の薄肉化による素
材のコストの低減等、工業的かつ経済的に自動車パネル
材を製造できるので、その実用上の効果は極めて太き特
許出願人 株式会社神戸製鋼所
代理人弁理士 中 村 尚(Effects of the Invention) As described in detail above, according to the present invention, it is possible to obtain an automobile panel material that is easy to mold and has high strength by performing heat treatment after the molding process. Unlike the conventional T6 treatment, this heat treatment is a relatively short heat treatment, so it saves energy.Furthermore, by increasing the strength after the heat treatment, the cost of the material is reduced due to the thinning of the aluminum alloy plate. Since it is possible to industrially and economically manufacture automobile panel materials by reducing the amount of carbon dioxide, the practical effects are extremely significant.Patent applicant Takashi Nakamura, Patent Attorney, Kobe Steel, Ltd.
Claims (1)
Ｓｉ：０．６〜２．０％を、Ｍｇ／Ｓｉ比が１以下で含
有するＡｌ−Ｍｇ−Ｓｉ系アルミニウム合金の溶体化処
理材を成形加工した後、１８５〜２２０℃の範囲で２０
〜６０分の加熱処理を施すことを特徴とする高成形で且
つ高強度の自動車パネル材の製造方法。Al-Mg-Si-based aluminum alloy containing Mg: 0.3 to 1.0% and Si: 0.6 to 2.0% in weight% (the same applies hereinafter) at a Mg/Si ratio of 1 or less After molding the solution-treated material, it is heated at a temperature of 185 to 220°C for 20
A method for producing a highly moldable and high-strength automobile panel material, the method comprising performing a heat treatment for ~60 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30192890A JPH04173942A (en) | 1990-11-06 | 1990-11-06 | Production of automotive panel material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30192890A JPH04173942A (en) | 1990-11-06 | 1990-11-06 | Production of automotive panel material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04173942A true JPH04173942A (en) | 1992-06-22 |
Family
ID=17902797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30192890A Pending JPH04173942A (en) | 1990-11-06 | 1990-11-06 | Production of automotive panel material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04173942A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1133646A (en) * | 1997-07-10 | 1999-02-09 | Kobe Steel Ltd | Aluminum alloy joined body by mechanical clinch and its manufacture |
| JP2009007617A (en) * | 2007-06-27 | 2009-01-15 | Kobe Steel Ltd | Aluminum alloy sheet for warm forming and manufacturing method therefor |
-
1990
- 1990-11-06 JP JP30192890A patent/JPH04173942A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1133646A (en) * | 1997-07-10 | 1999-02-09 | Kobe Steel Ltd | Aluminum alloy joined body by mechanical clinch and its manufacture |
| JP2009007617A (en) * | 2007-06-27 | 2009-01-15 | Kobe Steel Ltd | Aluminum alloy sheet for warm forming and manufacturing method therefor |
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