JP2006144043A - Method for producing magnesium alloy sheet having excellent press moldability - Google Patents

Method for producing magnesium alloy sheet having excellent press moldability Download PDF

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JP2006144043A
JP2006144043A JP2004332690A JP2004332690A JP2006144043A JP 2006144043 A JP2006144043 A JP 2006144043A JP 2004332690 A JP2004332690 A JP 2004332690A JP 2004332690 A JP2004332690 A JP 2004332690A JP 2006144043 A JP2006144043 A JP 2006144043A
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magnesium alloy
rolling
warm rolling
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press
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JP4476787B2 (en
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Sukenori Nakaura
祐典 中浦
Koichi Ohori
紘一 大堀
Takeshi Sakagami
武 坂上
Akira Watabe
晶 渡部
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MA Aluminum Corp
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Mitsubishi Aluminum Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a magnesium alloy sheet having excellent press moldability at high productivity. <P>SOLUTION: The molten metal of a magnesium alloy is subjected to continuous casting-rolling so as to be a beltlike sheet with a sheet thickness of 3 to 10 mm, thereafter, homogenizing heat treatment is performed, and subsequently, warm rolling or hot and warm rolling are performed. Under the hot and/or warm rolling stage, a process annealing stage can be provided. The magnesium alloy suitably has a composition comprising, by mass, 1 to 6.5% Al, 0.2 to 2.5% Zn and 0.1 to 0.5% Mn, and the balance Mg with inevitable impurities. A magnesium alloy sheet composed of fine crystal grains can be efficiently produced. The obtained magnesium alloy sheet has excellent press moldability, and, from which, a molding with a complicated shape can be easily molded. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、プレス成形性に優れたマグネシウム合金板の製造方法に関するものである。   The present invention relates to a method for producing a magnesium alloy plate excellent in press formability.

マグネシウム合金の結晶構造は稠密六方晶であることから、そうしたマグネシウム合金は、常温で塑性変形しにくく冷間加工性が悪い材料として知られている。そのため、従来は、マグネシウム合金が塑性変形しやすい熱間または温間で圧延し、所定の厚さのマグネシウム合金板を製造している。こうした方法は、特許文献１にも開示されており、マグネシウム合金からなる厚いスラブを熱間圧延や温間圧延することにより加熱と圧延を繰り返し、所望の厚さのマグネシウム合金板を製造している。
特開平６−２９３９４４号公報 Since the crystal structure of a magnesium alloy is a dense hexagonal crystal, such a magnesium alloy is known as a material that hardly undergoes plastic deformation at room temperature and has poor cold workability. For this reason, conventionally, a magnesium alloy sheet having a predetermined thickness is manufactured by rolling hot or warm in which the magnesium alloy is easily plastically deformed. Such a method is also disclosed in Patent Document 1, and a magnesium alloy sheet having a desired thickness is manufactured by repeating heating and rolling by hot rolling or warm rolling a thick slab made of a magnesium alloy. .
JP-A-6-293944

しかしながら、上述した従来の方法では、所定の厚さのマグネシウム合金板を製造するための加熱と圧延が繰り返されることから、非常に多くの時間と労力を必要とし、生産性向上の障害にもなっている。こうしたことは、マグネシウム合金板の製造コストにも反映し、マグネシウム合金板から成形されたプレス成形品の価格にも大きく影響している。
また、従来の製造方法においては、加熱と圧延が繰り返されることから、得られるマグネシウム合金板の結晶粒組織も粗大となる。このような結晶粒組織は、そのマグネシウム合金板を加温した状態でプレス成形する際のプレス成形性を低下させる。特に、プレス速度を高速にした場合においては、絞り加工時にコーナー部分がくびれたり割れが発生したりして、所望の形状を確保できないことがある。 However, in the conventional method described above, heating and rolling for producing a magnesium alloy plate having a predetermined thickness are repeated, so that a great amount of time and labor are required, which is an obstacle to improving productivity. ing. This also reflects the production cost of the magnesium alloy plate and greatly affects the price of the press-formed product formed from the magnesium alloy plate.
Moreover, in the conventional manufacturing method, since heating and rolling are repeated, the crystal grain structure of the obtained magnesium alloy plate also becomes coarse. Such a crystal grain structure reduces the press formability when the magnesium alloy plate is press-formed in a heated state. In particular, when the press speed is increased, the corner portion may be constricted or cracked during drawing and a desired shape may not be ensured.

本発明は、プレス成形性に優れたマグネシウム合金板を極めて効率よく製造することができる方法を提供すると共に、コストパフォーマンスに優れ且つ複雑な形状にプレス成形可能なマグネシウム合金板を提供するものである。   The present invention provides a method capable of producing a magnesium alloy plate excellent in press formability extremely efficiently, and also provides a magnesium alloy plate excellent in cost performance and capable of being press-formed into a complicated shape. .

すなわち、請求項１記載のプレス成形性に優れたマグネシウム合金板の製造方法の発明は、マグネシウム合金溶湯を板厚３〜１０ｍｍの帯状板に連続鋳造圧延した後、均質化熱処理を施し、その後、温間圧延または熱間および温間圧延することを特徴とする。   That is, the invention of the method for producing a magnesium alloy plate excellent in press formability according to claim 1 is characterized in that the magnesium alloy molten metal is continuously cast and rolled into a strip plate having a thickness of 3 to 10 mm, and then subjected to a homogenization heat treatment, It is characterized by warm rolling or hot and warm rolling.

請求項２記載のプレス成形性に優れたマグネシウム合金板の製造方法の発明は、請求項１記載の発明において、前記温間圧延または熱間および温間圧延工程途中に中間焼鈍工程を有することを特徴とする。   The invention of the method for producing a magnesium alloy plate excellent in press formability according to claim 2 is characterized in that, in the invention according to claim 1, an intermediate annealing step is included in the warm rolling or hot and warm rolling steps. Features.

請求項３記載のプレス成形性に優れたマグネシウム合金板の製造方法の発明は、請求項１または２に記載の発明において、前記マグネシウム合金が、質量％で、Ａｌ：１〜６．５％、Ｚｎ：０．２〜２．５％、Ｍｎ：０．１〜０．５％を含有し、残部がＭｇおよび不可避不純物である組成を有することを特徴とする。   The invention of the method for producing a magnesium alloy plate excellent in press formability according to claim 3 is the invention according to claim 1 or 2, wherein the magnesium alloy is in mass%, Al: 1 to 6.5%, It is characterized by containing Zn: 0.2-2.5%, Mn: 0.1-0.5%, with the balance being Mg and inevitable impurities.

本発明のうち請求項１記載の発明によれば、マグネシウム合金溶湯を板厚３〜１０ｍｍの帯状板に連続鋳造圧延した後、均質化熱処理を施し、その後、温間圧延または熱間および温間圧延するので、厚いスラブから加熱と熱間圧延や温間圧延を繰り返す従来の方法に比べて、極めて効率的にマグネシウム合金板を製造することができる。また、上述のように、加熱と熱間圧延の回数が少なくマグネシウム合金板を製造することができるので、微細な結晶粒からなるマグネシウム合金板を製造できる。そうして得られたマグネシウム合金板は、プレス成形性に優れ、複雑な形状の成形品を容易に成形することができる。   According to the first aspect of the present invention, the magnesium alloy melt is continuously cast and rolled into a strip having a thickness of 3 to 10 mm, and then subjected to a homogenization heat treatment, and then warm rolling or hot and warm. Since the rolling is performed, a magnesium alloy sheet can be manufactured extremely efficiently compared to the conventional method in which heating, hot rolling, and warm rolling are repeated from a thick slab. Moreover, since the frequency | count of a heating and hot rolling is few as mentioned above and a magnesium alloy plate can be manufactured, the magnesium alloy plate which consists of a fine crystal grain can be manufactured. The magnesium alloy sheet thus obtained is excellent in press formability and can easily form a molded product having a complicated shape.

また、請求項２記載の発明によれば、前記温間圧延または熱間および温間圧延工程途中に中間焼鈍工程を有するので、連続鋳造圧延板を高い圧延率で所定の厚さのマグネシウム合金板に加工することが可能になる。   In addition, according to the invention of claim 2, since there is an intermediate annealing step in the middle of the warm rolling or the hot and warm rolling steps, the magnesium alloy plate having a predetermined thickness at a high rolling rate Can be processed.

請求項３記載の本発明によれば、前記マグネシウム合金が、質量％で、Ａｌ：１〜６．５％、Ｚｎ：０．２〜２．５％、Ｍｎ：０．１〜０．５％を含有し、残部がＭｇおよび不可避不純物である組成を有するので、上記の連続鋳造圧延工程、均質加熱処理と熱間および／または温間圧延工程とを有する本発明の特徴的な製造方法に好適に適用され、極めて効率的にマグネシウム合金板を製造できると共に、製造されたマグネシウム合金板は、プレス成形性とコストパフォーマンスに優れ、複雑な形状の成形品に容易にプレス成形することができる。   According to this invention of Claim 3, the said magnesium alloy is the mass%, Al: 1-6.5%, Zn: 0.2-2.5%, Mn: 0.1-0.5% And the balance is Mg and inevitable impurities, so it is suitable for the characteristic manufacturing method of the present invention having the above-mentioned continuous casting rolling process, homogeneous heat treatment and hot and / or warm rolling process. In addition to being able to produce a magnesium alloy plate very efficiently, the produced magnesium alloy plate is excellent in press formability and cost performance, and can be easily press formed into a molded product having a complicated shape.

以下に、本発明のプレス成形性に優れたマグネシウム合金板（以下「マグネシウム合金板」という。）の製造方法の一実施形態について説明する。   Below, one Embodiment of the manufacturing method of the magnesium alloy plate (henceforth a "magnesium alloy plate") excellent in the press-formability of this invention is described.

本発明のマグネシウム合金板の製造方法は、図１に示すように、マグネシウム合金溶湯を双ロール法などにより、板厚３〜１０ｍｍの帯状板に連続鋳造圧延し、次いで均質化熱処理を施し、その後温間圧延または熱間および温間圧延することに特徴を有するものである。
連続鋳造圧延工程は、後述するマグネシウム合金の溶湯を、例えば水冷された一対のロールの間に供給し、連続的に薄い帯状板に鋳造圧延する工程である。本発明においては、連続鋳造圧延工程によって、極めて効率的なマグネシウム合金板の製造を可能にしたものである。本発明としては双ロールによる連続鋳造圧延方法が好適なものとして挙げられるが、特定の方法に限定されるものではない。また、双ロール法においては、例えば溶解炉で得られるマグネシウム合金溶湯をタンディッシュに供給し、該タンディッシュから供給されるマグネシウム合金溶湯を双ロールで圧延する。 As shown in FIG. 1, the magnesium alloy sheet manufacturing method of the present invention is a continuous casting and rolling of a magnesium alloy melt into a strip-shaped sheet having a thickness of 3 to 10 mm by a twin roll method, etc. It is characterized by warm rolling or hot and warm rolling.
The continuous casting and rolling step is a step in which a molten magnesium alloy described later is supplied between, for example, a pair of water-cooled rolls and continuously cast and rolled into a thin strip. In the present invention, a highly efficient magnesium alloy sheet can be produced by a continuous casting and rolling process. As the present invention, a continuous casting and rolling method using twin rolls may be mentioned as a suitable method, but the present invention is not limited to a specific method. In the twin roll method, for example, molten magnesium alloy obtained in a melting furnace is supplied to a tundish, and the molten magnesium alloy supplied from the tundish is rolled with a twin roll.

均質化熱処理工程は急冷凝固された連続鋳造圧延板におけるＡｌ、Ｚｎ溶質元素のデンドライト・セル境界および板厚中心部での高濃度の偏析を解消するために行われる。
熱処理条件としては３７０〜４７０℃の温度範囲で１時間以上行うのが好ましい。この熱処理により上記偏析が解消され、プレス成形性に優れたマグネシウム合金板を得ることができる。 The homogenization heat treatment process is performed to eliminate segregation of high concentration at the dendrite cell boundary and the center of the plate thickness of the Al and Zn solute elements in the rapidly cast and solidified continuous cast and rolled plate.
As heat treatment conditions, it is preferable to carry out at a temperature range of 370 to 470 ° C. for 1 hour or longer. By this heat treatment, the segregation is eliminated, and a magnesium alloy plate excellent in press formability can be obtained.

熱間／温間圧延工程は、所定の厚さの連続鋳造圧延板を目的の厚さのマグネシウム合金板に加工するための工程である。ここで、３００℃以上での圧延を熱間圧延、３００℃未満での圧延を温間圧延とする。最終温間圧延工程での圧下率としては、５０％以上の圧下率を特に好ましく適用できる。この圧下率は、一回（一パス）の圧延であっても複数回の圧延であってもよくパス数は特に限定されない。   The hot / warm rolling process is a process for processing a continuous cast rolled sheet having a predetermined thickness into a magnesium alloy sheet having a target thickness. Here, rolling at 300 ° C. or higher is hot rolling, and rolling at less than 300 ° C. is warm rolling. As the rolling reduction in the final warm rolling step, a rolling reduction of 50% or more can be particularly preferably applied. This rolling reduction may be one time (one pass) or a plurality of times of rolling, and the number of passes is not particularly limited.

中間焼鈍工程は、熱間圧延工程と温間圧延工程の間に、あるいは温間圧延工程の途中に設けることができる。温間圧延工程では、温間圧延での圧下率が８０％を超える場合に設けるのが好ましい。一の温間圧延工程での圧下率が８０％以下であっても、二以上の温間圧延工程でのトータルの圧下率が８０％を超える場合には、中間焼鈍工程を設け、その後に最終温間圧延工程を設けることが好ましい。
なお、中間焼鈍の条件としては、３００〜３５０℃の温度範囲で１〜８時間または３５０〜４５０℃の温度範囲で１分以下を例示することができる。中間焼鈍は、バッチ炉、連続炉のいずれであってもよい。 The intermediate annealing process can be provided between the hot rolling process and the warm rolling process or in the middle of the warm rolling process. In the warm rolling step, it is preferably provided when the rolling reduction in warm rolling exceeds 80%. Even if the reduction ratio in one warm rolling process is 80% or less, if the total reduction ratio in two or more warm rolling processes exceeds 80%, an intermediate annealing process is provided, and then the final It is preferable to provide a warm rolling process.
In addition, as conditions of intermediate annealing, 1 minute or less can be illustrated in the temperature range of 1 to 8 hours in the temperature range of 300-350 degreeC, or 350-450 degreeC. The intermediate annealing may be either a batch furnace or a continuous furnace.

こうした本発明のマグネシウム合金板の製造方法により、所望の厚さのマグネシウム合金板を極めて効率的に製造することができる。製造されるマグネシウム合金板は、微細な結晶粒を有する高強度のものとなり、深絞り等のプレス成形性に優れ、複雑な形状の成形体を容易に成形することができる。その結果、複雑な形状からなる電子部品ケース等の用途に好ましく適用することができる。   By such a method for producing a magnesium alloy plate of the present invention, a magnesium alloy plate having a desired thickness can be produced very efficiently. The manufactured magnesium alloy plate has high strength with fine crystal grains, is excellent in press formability such as deep drawing, and can easily form a compact shaped product. As a result, it can be preferably applied to uses such as an electronic component case having a complicated shape.

また、微細な結晶粒を有する高強度のマグネシウム合金板であることから、プレス成形の際に加温してプレス成形に最適な状態とし、プレス成形の効率化を図ることが可能である。本発明に係るマグネシウム合金板は、そうした加温処理によって、プレス成形に最適な状態を実現でき、例えばプレス成形品のコーナー部の成形量を調節することができる。その結果、難易度の高い部品形状の成形が可能となり、プレス成形の一層の効率化や連続成形性の向上を図ることができる。   In addition, since it is a high-strength magnesium alloy plate having fine crystal grains, it is possible to increase the efficiency of press forming by heating in the press forming to an optimum state for press forming. The magnesium alloy plate according to the present invention can realize an optimum state for press molding by such a heating treatment, and for example, the molding amount of the corner portion of the press-molded product can be adjusted. As a result, it is possible to form a part shape with a high degree of difficulty, and it is possible to further increase the efficiency of press molding and improve the continuous formability.

次に、マグネシウム合金の成分組成について説明する。
本発明の製造方法に適用されるマグネシウム合金は、好適には質量％で、Ａｌ：１〜６．５％、Ｚｎ：０．２〜２．５％、Ｍｎ：０．１〜０．５％、残部：Ｍｇおよび不可避不純物からなる成分組成を有するものである。 Next, the component composition of the magnesium alloy will be described.
The magnesium alloy applied to the production method of the present invention is preferably mass%, Al: 1 to 6.5%, Zn: 0.2 to 2.5%, Mn: 0.1 to 0.5% , Remainder: having a component composition consisting of Mg and inevitable impurities.

Ａｌは、１〜６．５％の範囲内で添加されていることが好ましく、２〜４％の範囲内で添加されていることがより好ましい。Ａｌは、強度等の機械的性質の向上および耐食性の向上を目的として積極的に添加されるものであるが、Ａｌの添加量が６．５％を超えると、冷間圧延工程における加工性が低下することがある。また、Ａｌの添加量が１％未満では、耐食性が低下する場合があるほか、強度が低下することがありその結果としてプレス成形性が低下することがある。   Al is preferably added in the range of 1 to 6.5%, and more preferably in the range of 2 to 4%. Al is positively added for the purpose of improving mechanical properties such as strength and improving corrosion resistance. However, if the amount of Al exceeds 6.5%, workability in the cold rolling process is improved. May decrease. Further, if the addition amount of Al is less than 1%, the corrosion resistance may be lowered, and the strength may be lowered. As a result, the press formability may be lowered.

Ｚｎは、０．２〜２．５％の範囲内で添加されていることが好ましい。Ｚｎは、Ａｌと同様に、強度等の機械的性質の向上に寄与するものであるが、Ｚｎの添加量が２．５％を超えると、耐食性が低下することがある。また、Ｚｎの添加量が０．２％未満では、強度が低下することがあり、その結果としてプレス成形性が低下することがある。   Zn is preferably added in the range of 0.2 to 2.5%. Zn, like Al, contributes to improvement in mechanical properties such as strength. However, if the amount of Zn exceeds 2.5%, corrosion resistance may decrease. Further, if the added amount of Zn is less than 0.2%, the strength may decrease, and as a result, the press formability may decrease.

Ｍｎは、０．１〜０．５％の範囲内で添加されていることが好ましい。Ｍｎは、耐食性を低下させる元素の影響を緩和する効果を有するものである。すなわち、Ｍｎを添加することによって、耐食性を低下させる不純物元素であるＦｅの影響を緩和することができ、上記の範囲内で添加することによって、その効果を最も発揮することができる。   Mn is preferably added in the range of 0.1 to 0.5%. Mn has an effect of alleviating the influence of elements that lower the corrosion resistance. That is, by adding Mn, the influence of Fe, which is an impurity element that lowers the corrosion resistance, can be mitigated, and by adding within the above range, the effect can be exhibited most.

以下に、実施例と比較例によって本発明を更に詳しく説明する。
（実施例）
双ロール法により、表１に示す合金組成からなるマグネシウム合金溶湯から、厚さ５ｍｍの帯状板を連続鋳造圧延した。得られた鋳造圧延板を４５０℃で８時間の均質化熱処理を施した後、一部は熱間圧延（圧延後板厚２．０ｍｍ）と温間圧延により、厚さ０．４ｍｍの本発明に係るマグネシウム合金板を得た（実施例１）。また、一部は厚さ２ｍｍまで熱間圧延し、次いで３５０℃で１時間の中間焼鈍を行った後、厚さ０．４ｍｍまで温間圧延し本発明に係るマグネシウム合金板を得た（実施例２）。 Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
(Example)
A strip-like plate having a thickness of 5 mm was continuously cast and rolled from a molten magnesium alloy having an alloy composition shown in Table 1 by a twin roll method. The obtained cast and rolled plate is subjected to a homogenizing heat treatment at 450 ° C. for 8 hours, and then a portion of the present invention having a thickness of 0.4 mm is obtained by hot rolling (plate thickness after rolling: 2.0 mm) and warm rolling. A magnesium alloy sheet according to Example 1 was obtained (Example 1). Further, a part was hot-rolled to a thickness of 2 mm, then subjected to an intermediate annealing at 350 ° C. for 1 hour, and then hot-rolled to a thickness of 0.4 mm to obtain a magnesium alloy sheet according to the present invention (implementation) Example 2).

Figure 2006144043
Figure 2006144043

こうして得られたマグネシウム合金板を、長さ８７ｍｍ×幅８４ｍｍ×コーナーＲ１０ｍｍのプレス成形用の試験片に加工した。   The magnesium alloy plate thus obtained was processed into a test piece for press molding having a length of 87 mm, a width of 84 mm, and a corner R of 10 mm.

（比較例１）
実施例１に示した製造工程から均質化熱処理を省いた他は同様の工程にて厚さ０．４ｍｍのマグネシウム合金板を得た。 (Comparative Example 1)
A magnesium alloy plate having a thickness of 0.4 mm was obtained by the same process except that the homogenization heat treatment was omitted from the manufacturing process shown in Example 1.

（比較例２）
通常の溶解法により、表１に示す成分組成からなるマグネシウム合金を溶製し、厚さ６０ｍｍのスラブを作製した。このスラブを４６０℃に加熱した後、１パス当たり５〜３０％の圧下率で厚さ３０ｍｍになるまで熱間圧延を行った。このときの熱間圧延においては、材料温度が４００℃以上になるように維持させた。次に、熱間圧延された板材を研削した後、パス間に設けた加熱炉により、その板厚を３４０〜３８０℃の温度に維持させつつ圧延を行い、厚さ３ｍｍの板材に加工した。さらに、温度２００〜２３０℃、１パス当たりの圧下率２〜５％の温間圧延を繰り返し行い、厚さ０．４ｍｍのマグネシウム合金板を得た。こうして得られたマグネシウム合金板を、長さ８７ｍｍ×幅８４ｍｍ×コーナーＲ１０ｍｍのプレス成形用の試験片に加工した。 (Comparative Example 2)
A magnesium alloy having a component composition shown in Table 1 was melted by a normal melting method to produce a slab having a thickness of 60 mm. The slab was heated to 460 ° C. and then hot-rolled at a reduction rate of 5 to 30% per pass until the thickness reached 30 mm. In the hot rolling at this time, the material temperature was maintained at 400 ° C. or higher. Next, after the hot-rolled plate material was ground, it was rolled by a heating furnace provided between passes while maintaining the plate thickness at a temperature of 340 to 380 ° C., and processed into a plate material having a thickness of 3 mm. Further, warm rolling at a temperature of 200 to 230 ° C. and a reduction rate of 2 to 5% per pass was repeated to obtain a magnesium alloy plate having a thickness of 0.4 mm. The magnesium alloy plate thus obtained was processed into a test piece for press molding having a length of 87 mm, a width of 84 mm, and a corner R of 10 mm.

（プレス成形性の評価）
プレス成形性を評価するプレス成形型としては、０．２ｍｍのコーナーＲを有し、且つその中心部分に深さ０．５ｍｍのエンボス文字を成形品に形成できるエンボス成形部を有する、深さ７ｍｍの角型のエンボス成形型を用いた。
プレス成形については、上記のプレス成形型を使用し、上述の実施例および比較例で得られたプレス成形用の試験材料を、表２に示す温度で所定時間保持した状態で、１２０ｍｍ／分のプレス速度でプレス成形した。なお、プレス成形用の試験材料の加温は、プレス成形型に埋め込んだ１ｋＷ×４本のヒーターによって行い、試験材料の表面に最も近い側のプレス成形型に埋め込んだ熱電対によって測定した。
プレス成形性は、加工量が最も大きくなるコーナー部分に割れが発生するか否かによって評価した。割れが発生しない場合には○とし、割れが発生した場合には×とした。その結果を表２に示した。 (Evaluation of press formability)
The press mold for evaluating the press formability has a corner R of 0.2 mm, and an embossed part that can form an embossed character with a depth of 0.5 mm in the center of the molded product, and has a depth of 7 mm. The square embossing mold was used.
For press molding, the above-mentioned press mold was used, and the test materials for press molding obtained in the above-mentioned examples and comparative examples were held at the temperatures shown in Table 2 for a predetermined time, and were 120 mm / min. Press molding was performed at a press speed. Note that the heating of the test material for press molding was performed by 1 kW × 4 heaters embedded in the press mold and was measured by a thermocouple embedded in the press mold closest to the surface of the test material.
The press formability was evaluated based on whether or not cracking occurred at the corner portion where the processing amount was the largest. When the crack did not occur, it was marked as ◯, and when the crack occurred, it was marked as x. The results are shown in Table 2.

Figure 2006144043
Figure 2006144043

（評価結果）
表２の結果からも明らかなように、本発明のマグネシウム合金板の製造方法によって製造されたプレス成形用の試験材料（実施例１、２）は、加温した状態でプレス成形を行った際の割れの発生は見られなかった。一方、連続鋳造圧延材に均質加熱処理を行わなかった試験材料（比較例１）と従来のマグネシウム合金板の製造方法によって製造されたプレス成形用の試験材料（比較例２）は、加温した状態でプレス成形を行った際の割れの発生が見られた。 (Evaluation results)
As is clear from the results in Table 2, the press-molding test materials (Examples 1 and 2) produced by the method for producing a magnesium alloy plate of the present invention were subjected to press molding in a heated state. There was no occurrence of cracking. On the other hand, the test material (Comparative Example 1) that was not subjected to the homogeneous heat treatment on the continuously cast rolled material and the test material for press forming (Comparative Example 2) manufactured by the conventional method for manufacturing a magnesium alloy plate were heated. Generation of cracks was observed when press molding was performed in this state.

以上説明したように、本発明のプレス成形性に優れたマグネシウム合金板の製造方法によれば、プレス成形性に優れたマグネシウム合金板を極めて効率的に製造できるので、マグネシウム合金板の生産性を大幅に向上させることができる。   As described above, according to the method for manufacturing a magnesium alloy plate excellent in press formability according to the present invention, a magnesium alloy plate excellent in press formability can be manufactured extremely efficiently. It can be greatly improved.

また、本発明の製造方法によって製造されたマグネシウム合金板は、プレス成形性を飛躍的に向上させることができるので、従来不可能とされてきたような複雑な形状からなるプレス成形体を成形することができる。その結果、マグネシウム合金からなるプレス成形品の適用範囲を著しく拡大でき、軽量で構造強度の高い成形体を提供することができる。   Moreover, since the magnesium alloy plate manufactured by the manufacturing method of the present invention can dramatically improve the press formability, a press-formed body having a complicated shape that has been impossible in the past is formed. be able to. As a result, the range of application of the press-formed product made of a magnesium alloy can be remarkably expanded, and a molded body that is lightweight and has high structural strength can be provided.

本発明の一実施形態の製造工程を示す図である。It is a figure which shows the manufacturing process of one Embodiment of this invention.

Claims (3)

マグネシウム合金溶湯を板厚３〜１０ｍｍの帯状板に連続鋳造圧延した後、均質化熱処理を施し、その後、温間圧延または熱間および温間圧延することを特徴とするプレス成形性に優れたマグネシウム合金板の製造方法。   Magnesium excellent in press formability, characterized in that the molten magnesium alloy is continuously cast and rolled into a strip plate having a thickness of 3 to 10 mm, and then subjected to a homogenization heat treatment, followed by warm rolling or hot and warm rolling. Manufacturing method of alloy plate. 前記温間圧延または熱間および温間圧延工程途中に中間焼鈍工程を有することを特徴とする請求項１に記載のプレス成形性に優れたマグネシウム合金板の製造方法。   The method for producing a magnesium alloy sheet excellent in press formability according to claim 1, further comprising an intermediate annealing step in the middle of the warm rolling or hot and warm rolling steps. 前記マグネシウム合金が、質量％で、Ａｌ：１〜６．５％、Ｚｎ：０．２〜２．５％、Ｍｎ：０．１〜０．５％を含有し、残部がＭｇおよび不可避不純物である組成を有することを特徴とする請求項１または請求項２に記載のプレス成形性に優れたマグネシウム合金板の製造方法。   The magnesium alloy contains, by mass, Al: 1 to 6.5%, Zn: 0.2 to 2.5%, Mn: 0.1 to 0.5%, with the balance being Mg and inevitable impurities. The method for producing a magnesium alloy sheet having excellent press formability according to claim 1 or 2, wherein the magnesium alloy sheet has a certain composition.
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