JP2001286969A - Magnesium alloy thin formed body - Google Patents
Magnesium alloy thin formed bodyInfo
- Publication number
- JP2001286969A JP2001286969A JP2000097177A JP2000097177A JP2001286969A JP 2001286969 A JP2001286969 A JP 2001286969A JP 2000097177 A JP2000097177 A JP 2000097177A JP 2000097177 A JP2000097177 A JP 2000097177A JP 2001286969 A JP2001286969 A JP 2001286969A
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- Prior art keywords
- magnesium alloy
- less
- thickness
- plastic working
- forging
- 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.)
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】本願発明はマグネシウム合金
製薄肉成形体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin formed body made of a magnesium alloy.
【0002】[0002]
【従来の技術】マグネシウムは、その密度が1.8g/
cm3 と現在実用化されている金属材料の中で最も密度
が小さい材料であり、一般に金属の軽量化材料として各
種用途に広く使用されているアルミニウムの密度2.7
g/cm3 と比較しても2/3と小さい。このため、マ
グネシウム合金はアルミニウム合金に代わる軽量化材料
として最近注目され、幅広い分野において使用されつつ
ある。2. Description of the Related Art Magnesium has a density of 1.8 g / g.
cm 3 , which is the material with the lowest density among the metal materials currently in practical use, and generally has a density of 2.7 which is widely used for various purposes as a metal lightening material.
g / 3 in comparison with g / cm 3 . For this reason, magnesium alloys have recently attracted attention as a lightweight material replacing aluminum alloys, and are being used in a wide range of fields.
【0003】近年、電子回路部品・素子の高集積化・高
密度化等を背景にして、携帯電話機等の小形通信機器、
ノート型あるいはモバイル型パソコン等の小形事務機
器、その他多くの用途において、小型化・軽量化が盛ん
に試みられている。そのうち携帯用の機器の筐体などは
特に小型・軽量化、しかも美観と実装部品の容積確保の
ため薄肉にすることが求められている。かかる要求に応
えるものの一つとして、マグネシウム合金製の薄肉成形
体の出現が望まれている。In recent years, with the background of high integration and high density of electronic circuit parts and elements, small communication devices such as mobile phones,
2. Description of the Related Art Miniaturization and weight reduction have been actively attempted for small office equipment such as a notebook or mobile personal computer and many other applications. Of these, the housing of portable equipment is required to be particularly small and lightweight, and to be thin to ensure aesthetics and the volume of mounted components. As one of the demands to meet such demands, the appearance of a thin molded body made of a magnesium alloy is desired.
【0004】マグネシウム合金製の成形体の殆どは鋳造
材として使用されているのが現状である。そして、マグ
ネシウム合金溶湯を鋳造して得られる成形体は、その製
法上の制約から、比較的厚肉のものに限定され、薄肉の
成形体を得ることは難しい。また、その製造過程中にお
いて、鋳造欠陥や酸化物を内部及び表面に介在させてし
まう虞が大きく、もしも、これらの欠陥等が介在してい
ると、機械的強度の点で、また特に耐食性等についても
問題が発生する。[0004] At present, most of magnesium alloy compacts are used as cast materials. The compact obtained by casting the magnesium alloy melt is limited to a relatively thick one due to the restrictions on the manufacturing method, and it is difficult to obtain a thin compact. Further, during the manufacturing process, there is a great possibility that casting defects and oxides are interposed inside and on the surface. If these defects and the like are present, in terms of mechanical strength, especially corrosion resistance etc. A problem also occurs.
【0005】[0005]
【発明が解決しようとする課題】この問題を解決しよう
と、鍛造などの塑性加工によるマグネシウム合金製の成
形体が考えられるが、マグネシウムの結晶構造が稠密六
方晶であるため塑性加工が極めて難しく、マグネシウム
合金の金属流れ(以下、「メタルフロー」という)が出
現したり、また、肉厚が変動したりする。マグネシウム
合金製の成形体を長期間安定して使用するには、表面に
耐食性付与の表面処理や塗装処理を施す必要があるが、
塑性加工後の成形体表面にメタルフローがあると、表面
処理や塗装処理後に光の反射の加減ですじむらなどが見
えて美観を損ね、商品価値を落とすことがある。また、
塑性加工後の成形体肉厚が変動すると、実装する部品の
容積を確保できなかったり、例えば携帯電話での押釦な
ど成形体を貫通して部品を装着する場合に操作しづらく
なる。本発明の課題は、表面処理や塗装処理の後におい
ても、すじむらなどを見え難くして美観を良くし、ま
た、肉厚変動を少なくして実装部品の容積や装着性を確
保できる、マグネシウム合金製薄肉成形体を得ることに
ある。In order to solve this problem, a molded body made of a magnesium alloy by plastic working such as forging is conceivable. However, since the crystal structure of magnesium is dense hexagonal, plastic working is extremely difficult. The metal flow of the magnesium alloy (hereinafter, referred to as “metal flow”) appears, and the thickness varies. In order to use magnesium alloy compacts stably for a long period of time, it is necessary to perform surface treatment or coating treatment for imparting corrosion resistance to the surface,
If there is a metal flow on the surface of the molded body after plastic working, unevenness or the like can be seen due to the degree of reflection of light after surface treatment or painting treatment, which may impair the aesthetic appearance and lower the commercial value. Also,
If the thickness of the molded body after the plastic working fluctuates, the volume of the component to be mounted cannot be ensured, or it becomes difficult to operate the component when mounting the component through a molded body such as a push button of a mobile phone. The object of the present invention is to improve the appearance by making it difficult to see streaks and the like, even after surface treatment or coating treatment, and also to reduce the thickness variation and secure the volume and mountability of mounted components, magnesium. An object of the present invention is to obtain an alloy thin molded body.
【0006】[0006]
【課題を解決するための手段】本発明者らは、上記課題
を解決するため種々検討を行った。その結果、マグネシ
ウム合金素材に鍛造などの塑性加工を施し、塑性加工後
の主要部の表面粗さを70μmRa以下にすることで、
表面処理や塗装処理の後においても、すじむらなどが見
え難くなって美観の良い成形体となり、また、塑性加工
後の主要部の肉厚を変動幅で70μm以下とすることで
実装部品の容積や装着性を確保できる成形体となり、こ
のときの主要部の肉厚を好ましくは1.5mm以下、ま
た塑性加工を好ましくは熱間鍛造及び/または温間鍛
造、また塑性加工前のマグネシウム合金素材の結晶構造
とその平均粒径、板厚変動、厚さを選択することで、電
子機器用部品にも適用できるマグネシウム合金製薄肉成
形体が得られるとの知見を得て本発明に想到した。Means for Solving the Problems The present inventors have conducted various studies to solve the above problems. As a result, the magnesium alloy material is subjected to plastic processing such as forging, and the surface roughness of the main part after the plastic processing is reduced to 70 μm Ra or less.
Even after surface treatment or coating treatment, stripes and the like are hard to be seen, resulting in a molded product with good appearance. In addition, the thickness of the main part after plastic working is set to 70 μm or less in variation width, so that the volume of mounted parts is reduced. In this case, the thickness of the main part is preferably 1.5 mm or less, and the plastic working is preferably hot forging and / or warm forging, and the magnesium alloy material before the plastic working is performed. The present inventors have found that by selecting the crystal structure and the average grain size, plate thickness variation, and thickness thereof, a thin-walled product made of a magnesium alloy that can be applied to electronic device parts can be obtained, and arrived at the present invention.
【0007】即ち、本発明のマグネシウム合金製薄肉成
形体は、マグネシウム合金素材に塑性加工を施し、塑性
加工後の主要部の表面表面粗さを70μmRa以下とし
たことを特徴とする。That is, the magnesium alloy thin molded article of the present invention is characterized in that a magnesium alloy material is subjected to plastic working and the surface roughness of the main part after the plastic working is reduced to 70 μmRa or less.
【0008】また、本発明のマグネシウム合金製薄肉成
形体は、マグネシウム合金素材に塑性加工を施し、塑性
加工後の主要部の肉厚変動幅を70μm以下としたこと
を特徴とする。[0008] Further, the magnesium alloy thin molded body of the present invention is characterized in that a magnesium alloy material is subjected to plastic working, and a thickness variation width of a main portion after the plastic working is set to 70 µm or less.
【0009】また、本発明のマグネシウム合金製薄肉成
形体は、マグネシウム合金素材に塑性加工を施し、塑性
加工後の主要部の表面表面粗さを70μmRa以下、主
要部の肉厚変動幅を70μm以下としたことを特徴とす
る。Further, the magnesium alloy thin molded article of the present invention is obtained by subjecting a magnesium alloy material to plastic working, to have a surface roughness of the main portion after plastic working of 70 μm Ra or less, and a thickness variation width of the main portion of 70 μm or less. It is characterized by having.
【0010】そして、上記成形体は、主要部の肉厚が好
ましくは1.5mm以下であることを特徴とする。ま
た、塑性加工が、好ましくは熱間鍛造または温間鍛造で
あることを特徴とする。また、マグネシウム合金素材
が、好ましくは等方性の微細結晶を有し、板厚変動が±
0.2mm以下であることを特徴とする。また、マグネ
シウム合金素材の板厚が、好ましくは3mm以下である
ことを特徴とする。また微細結晶は、更に好ましくは平
均粒径が300μm以下であることを特徴とする。[0010] The molded body is characterized in that the thickness of the main part is preferably 1.5 mm or less. Further, the plastic working is preferably hot forging or warm forging. Further, the magnesium alloy material preferably has isotropic fine crystals, and the thickness variation is ±
It is characterized by being 0.2 mm or less. The thickness of the magnesium alloy material is preferably 3 mm or less. Further, the fine crystals are more preferably characterized by having an average particle size of 300 μm or less.
【0011】また、本発明のマグネシウム合金薄肉成形
体は、その表面に塗装処理及び/または陽表面処理が施
されていることを特徴とする。Further, the magnesium alloy thin molded body of the present invention is characterized in that its surface has been subjected to a coating treatment and / or a positive surface treatment.
【0012】そして、本発明のマグネシウム合金薄肉成
形体は、電子機器用部品であることを特徴とする。The magnesium alloy thin-walled molded product of the present invention is characterized in that it is a component for electronic equipment.
【0013】ここで主要部とは、マグネシウム合金製薄
肉成形体の底部や周壁部の大部分を占める均一肉厚の部
位を指し、模様やボスなどで極端に肉厚が変動する部位
は勘案しないものとする。また、塑性加工とは、プレス
またはハンマなどの静的、動的押圧力を利用する鍛造な
どの成形法をいう。Here, the main portion refers to a portion having a uniform thickness occupying most of the bottom portion and the peripheral wall portion of the magnesium alloy thin-walled molded product, and does not take into account a portion whose thickness is extremely varied due to a pattern, a boss, or the like. Shall be. Further, the plastic working refers to a forming method such as forging using a static or dynamic pressing force such as a press or a hammer.
【0014】以下、本発明のマグネシウム合金製薄肉成
形体を得るための解決手段について詳細に説明する。 (マグネシウム合金の組成)マグネシウム合金素材を鍛
造などの塑性加工を施して、薄肉の成形体を製造するに
際しては、塑性加工性に優れたマグネシウム合金である
ことが望ましい。このため、マグネシウム合金素材の組
成は、質量比で、Al:1〜6%、Mn:0.5%以
下、微量元素0.2%以下、残部Mg及び不可避的不純
物、または更にZn:2.5%以下を含有するものが好
ましい。アルミニウムは、含有量が1%未満であると剛
性が低くなり、一方、含有量が6%を超えると、塑性加
工性、耐食性が低下する。亜鉛もアルミニウムと同様な
影響があり、塑性加工性とメタルフローの兼ね合いから
2.5%以下のものが良い。このような合金としては、
例えば、ASTM規格のAZ31合金、AZ21合金、
AM20合金などがある。なお、本発明のマグネシウム
合金製薄肉成形体に適用できるマグネシウム合金は、上
記組成に限定されるものではなく、合金元素として、希
土類元素、リチウム、ジルコニウム等を添加含有したも
のも適用可能である。Hereinafter, the means for obtaining the magnesium alloy thin-walled compact of the present invention will be described in detail. (Composition of Magnesium Alloy) When a thin formed body is produced by subjecting a magnesium alloy material to plastic working such as forging, it is desirable that the magnesium alloy be excellent in plastic workability. For this reason, the composition of the magnesium alloy material is, as a mass ratio, Al: 1 to 6%, Mn: 0.5% or less, trace element 0.2% or less, the balance Mg and unavoidable impurities, or further Zn: 2. Those containing 5% or less are preferred. If the content of aluminum is less than 1%, the rigidity decreases, while if the content exceeds 6%, the plastic workability and the corrosion resistance deteriorate. Zinc has the same effect as aluminum, and is preferably 2.5% or less in view of the balance between plastic workability and metal flow. Such alloys include:
For example, ASTM standard AZ31 alloy, AZ21 alloy,
AM20 alloy and the like. The magnesium alloy that can be applied to the magnesium alloy thin molded body of the present invention is not limited to the above composition, and a magnesium alloy to which a rare earth element, lithium, zirconium, or the like is added as an alloy element is also applicable.
【0015】(塑性加工、好ましくは熱間鍛造及び/ま
たは温間鍛造)一回の塑性加工でも良いが、より精度の
良い形状で、かつ、表面性状に優れた薄肉の成形体を得
る場合には、複数回の塑性加工とすることが好ましい。
具体的には、マグネシウム合金素材を200〜540℃
の鍛造温度で、10〜300kN/cm2 の成形荷重を
付加しながら1〜500mm/sの鍛造速度で鍛造加工
することにより、75%以下の圧下率で素材を展延させ
て荒鍛造成形体に成形する荒鍛造加工と、荒鍛造加工で
得られた荒鍛造成形体を200〜540℃の鍛造温度
で、10〜200kN/cm2 の成形荷重を付加しなが
ら1〜200mm/sの鍛造速度で鍛造加工することに
より50%以下の圧下率で仕上鍛造成形体に成形する仕
上鍛造加工とするのが好ましい。(Plastic working, preferably hot forging and / or warm forging) A single plastic working may be used. However, when a thin molded body having a more accurate shape and excellent surface properties is obtained. Is preferably subjected to plastic working a plurality of times.
Specifically, a magnesium alloy material is heated to 200 to 540 ° C.
By forging at a forging temperature of 1 to 500 mm / s while applying a forming load of 10 to 300 kN / cm 2 , the material is spread at a reduction ratio of 75% or less to obtain a rough forged compact. Forging speed of 1 to 200 mm / s at a forging temperature of 200 to 540 ° C. while applying a forming load of 10 to 200 kN / cm 2 at a forging temperature of 200 to 540 ° C. It is preferable to use a finish forging process in which a forging process is performed to form a finished forged product with a reduction ratio of 50% or less.
【0016】鍛造温度が200℃未満では鍛造加工時に
メタルフローが円滑に得られず、金型のポンチとダイか
ら構成される空間部にマグネシウム合金素材が展伸して
充満しないので、薄肉化が困難であると共に良好な周壁
部を形成することができない場合がある。一方、鍛造温
度が540℃を超えると結晶粒の粗大化を招き、また、
加工率によっては発火し燃焼する恐れもある。好ましく
は、鍛造温度は300〜450℃である。If the forging temperature is less than 200 ° C., the metal flow cannot be obtained smoothly during the forging process, and the space formed by the punch and the die of the mold does not expand and fill the space of the magnesium alloy material. In some cases, it is difficult to form a good peripheral wall portion. On the other hand, if the forging temperature exceeds 540 ° C., the crystal grains become coarse, and
Depending on the processing rate, it may ignite and burn. Preferably, the forging temperature is between 300 and 450C.
【0017】鍛造速度が1mm/s未満では、素材の温
度が低下して良好な精度の成形体が得られない。一方、
鍛造速度が500mm/sを超えると、メタルフローが
鍛造速度に円滑に追随できなくなり、メタルフローに乱
れを生じて、すじむらが現れやすい。生産性を重視する
荒鍛造加工は鍛造速度10〜500mm/sで行い、成
形性を重視する仕上鍛造加工は鍛造速度1〜200mm
/sで行うことが好ましい。If the forging speed is less than 1 mm / s, the temperature of the raw material is lowered, and a molded article with good precision cannot be obtained. on the other hand,
When the forging speed exceeds 500 mm / s, the metal flow cannot smoothly follow the forging speed, and the metal flow is disturbed, so that stripes are likely to appear. Rough forging with emphasis on productivity is performed at a forging speed of 10 to 500 mm / s, and finish forging with emphasis on formability is forging speed of 1 to 200 mm.
/ S is preferred.
【0018】(塑性加工後の表面粗さ)塑性加工後の主
要部の表面粗さを70μmRa以下とすることで、塗装
処理や表面処理の後においても、すじむらなどが見え難
くなって美観が良くなる。塑性加工後の主要部の表面粗
さを70μmRa以下とするには、鍛造加工用金型の表
面粗さを25μmRa以下、好ましくは20μmRa以
下とする。(Surface Roughness after Plastic Working) By setting the surface roughness of the main part after plastic working to 70 μmRa or less, it becomes difficult to see streaks and unevenness even after coating or surface treatment, and the appearance is improved. Get better. In order to make the surface roughness of the main part after plastic working 70 μm Ra or less, the surface roughness of the forging die is 25 μm Ra or less, preferably 20 μm Ra or less.
【0019】(塑性加工後の主要部の肉厚変動)塑性加
工後、成形体の主要部の肉厚変動が70μmを超える
と、実装する部品の容積を確保できなかったり、例えば
携帯電話などの電子機器用部品として用いた場合、押釦
の突出量が少なくて押しづらくなったり、突出量が多す
ぎて不必要の場合も押してしまうようなことがあるの
で、好ましくない。(Thickness variation of main part after plastic working) If the thickness fluctuation of the main part of the molded body exceeds 70 μm after plastic working, it is not possible to secure the volume of parts to be mounted, When used as a component for an electronic device, the push button has a small amount of protrusion, making it difficult to press, or an excessive amount of protrusion may push the button when it is unnecessary.
【0020】(成形体の主要部の肉厚)成形体の主要部
の肉厚が1.5mmを超えると、成形体を筐体として外
形寸法を規定した場合、成形体内に実装する容積を確保
できないことがある。主要部の肉厚は好ましくは0.3
〜1mmである。(Thickness of Main Portion of Molded Body) When the thickness of the main portion of the molded body exceeds 1.5 mm, when the external dimensions are defined by using the molded body as a housing, the volume to be mounted in the molded body is secured. There are things you can't do. The thickness of the main part is preferably 0.3
11 mm.
【0021】(素材が等方性で微細結晶)等方性とはマ
グネシウム合金素材の縦方向と横方向の伸びのパーセン
トの比率(伸びの小さい値/伸びの大きい値)が70%
以上のものとする。等方性でないと、具体的には、縦方
向の伸び21%で横方向の伸び13%の場合((伸びの
小さい値/伸びの大きい値)=約62%)のように等方
性が無い場合には、一方向には展延するが、それと直角
方向には展延が困難でありすじむらが発生し易くなる。
素材が微細結晶でなく、その平均粒径が300μmを超
えると展延しにくく、成形体としての所望の強度が保て
なくなり割れ易くなる。(The material is isotropic and fine crystal) The isotropic means that the ratio of the elongation in the longitudinal direction and the elongation in the transverse direction of the magnesium alloy material (small elongation value / large elongation value) is 70%.
The above is assumed. If it is not isotropic, specifically, the isotropic property is as in the case of 21% in the longitudinal direction and 13% in the transverse direction ((small value of elongation / large value of elongation) = about 62%). If there is no such sheet, it spreads in one direction, but it is difficult to spread it in a direction perpendicular to that direction, so that streaking tends to occur.
If the material is not a fine crystal and the average particle size exceeds 300 μm, it is difficult to spread, and the desired strength as a molded article cannot be maintained, and the article tends to crack.
【0022】(素材の板厚変動)マグネシウム合金素材
の板厚変動は少なくすることが好ましい。マグネシウム
合金素材の板厚変動を±0.2mm以下、好ましくは±
0.12mm以下とすることで、塑性加工でメタルフロ
ーを一様に展延させ、塑性加工後の成形体の肉厚変動を
70μm以下、また、表面粗さを70μmRa以下にで
きる。(Variation in thickness of raw material) It is preferable to reduce variation in thickness of the magnesium alloy material. The thickness variation of the magnesium alloy material is ± 0.2 mm or less, preferably ±
By setting the thickness to 0.12 mm or less, the metal flow can be uniformly spread by the plastic working, and the thickness variation of the molded body after the plastic working can be reduced to 70 μm or less, and the surface roughness can be reduced to 70 μm Ra or less.
【0023】(素材の板厚)マグネシウム合金素材の板
厚は、3mm以下であるのが好ましい。マグネシウム合
金素材の板厚が3mmを超えると、塑性加工で四方に展
延させるための圧下率を大きくしなければならず、メタ
ルフローが著しくなり、メタルフローに沿ってすじむら
が出現する虞がある。(Material Thickness) The magnesium alloy material preferably has a thickness of 3 mm or less. If the thickness of the magnesium alloy material exceeds 3 mm, the rolling reduction in order to spread in all directions by plastic working must be increased, and the metal flow becomes remarkable, and there is a possibility that streaks appear along the metal flow. is there.
【0024】(表面処理及び/または塗装処理)塑性加
工後の成形体の表面には、防食性を付与するため表面処
理または塗装処理を施す。更に塗装処理の下地、または
塗装処理では得られない優れた防食性及びマグネシウム
素地を生かした金属光沢を持たせるため、(JIS)H
8651に基づく表面処理を行う。表面処理のうち特
殊複合陽極酸化皮膜処理は、マグネシウム合金薄肉成形
体の組成、希望する色調に応じて、処理剤として、重ク
ロム酸ナトリウム、酸性ふっ化ナトリウム、酸性ふっ化
カリウム、酸性ふっ化アンモニウム、硝酸アンモニウ
ム、第1リン酸ナトリウム、アンモニア水などを複数適
量混合し、成形体に対して一定の温度、時間、電流値で
処理する。(Surface Treatment and / or Painting Treatment) The surface of the molded body after plastic working is subjected to a surface treatment or painting treatment to impart corrosion resistance. Furthermore, in order to give the base material of the coating process or the excellent anticorrosion that cannot be obtained by the coating process and the metallic luster utilizing the magnesium base, (JIS) H
Surface treatment based on 8651 is performed. Among the surface treatments, the special composite anodic oxide film treatment uses sodium dichromate, sodium acid fluoride, potassium acid fluoride, and ammonium acid fluoride as treatment agents according to the composition of the magnesium alloy thin molded product and the desired color tone. , Ammonium nitrate, monobasic sodium phosphate, aqueous ammonia, etc. are mixed in appropriate amounts, and the molded body is treated at a constant temperature, time, and current value.
【0025】(電子機器用部品)マグネシウム合金製薄
肉成形体を用いた電子機器用部品としては、携帯電話用
筐体などの通信機器端末部品、ノート型あるいはモバイ
ル型パソコンなどの小形事務機器部品がある。(Electronic Equipment Parts) Examples of electronic equipment parts using a thin molded body made of a magnesium alloy include communication equipment terminal parts such as a mobile phone casing and small office equipment parts such as a notebook or mobile personal computer. is there.
【0026】[0026]
【発明の実施の形態】以下、発明の実施の形態を説明す
る。図1は、マグネシウム合金製薄肉成形体の一例を示
す概略構成斜視図である。図1で、成形体1は、基本的
な形状として、底部2と周壁部3を有する断面をほぼ凹
状としている。そして、底部2及び周壁部3は肉厚
(t)を1.2mmと極めて薄肉としている。Embodiments of the present invention will be described below. FIG. 1 is a schematic configuration perspective view showing an example of a thin molded body made of a magnesium alloy. In FIG. 1, as a basic shape, a molded body 1 has a substantially concave cross section having a bottom 2 and a peripheral wall 3. The bottom portion 2 and the peripheral wall portion 3 have an extremely thin thickness (t) of 1.2 mm.
【0027】一方、図2は、図1と同じ形状で、図1と
は逆の裏から見た比較例の成形体1aの概略斜視図であ
る。図2の成形体1aで、4はすじむらであり、鍛造加
工後に直接現れたり、塗装または表面処理後に現れたり
している。このようなすじむら4が現れた成形体1aは
不良品となることがある。なお、2aは底部、3aは周
壁部を示す。On the other hand, FIG. 2 is a schematic perspective view of a molded body 1a of a comparative example having the same shape as that of FIG. In the molded body 1a in FIG. 2, reference numeral 4 denotes a line unevenness, which appears directly after forging or appears after painting or surface treatment. The molded body 1a in which such line unevenness 4 appears may be a defective product. In addition, 2a shows a bottom part and 3a shows a peripheral wall part.
【0028】図3は、マグネシウム合金素材を鍛造加工
する荒鍛造用金型の一例を示す要部断面図である。図3
で、下金型6には凹部(以下、「ダイ部」という)7を
形成し、上金型9には、下金型6の凹部7に対応する凸
部(以下、「ポンチ部」という)9を形成している。5
は、(JIS)AZ31マグネシウム合金からなり、縦
と横の伸びの比率が70%以上の等方性を有する薄板の
素材である。素材5は、下金型6のダイ部7上に載置し
ているが、載置方法や戴置位置は素材5の形状寸法に応
じて定め、ダイ部7の底面に接するように載置したり、
ダイ部7を覆うようにしてダイ部7の上端部に戴置して
も良い。FIG. 3 is a sectional view of an essential part showing an example of a rough forging die for forging a magnesium alloy material. FIG.
Thus, a concave portion (hereinafter, referred to as “die portion”) 7 is formed in the lower die 6, and a convex portion (hereinafter, referred to as “punch portion”) corresponding to the concave portion 7 of the lower die 6 is formed in the upper die 9. 9). 5
Is an isotropic thin plate material made of a (JIS) AZ31 magnesium alloy and having a ratio of vertical to horizontal elongation of 70% or more. The blank 5 is placed on the die 7 of the lower mold 6, but the placement method and placement position are determined according to the shape and dimensions of the blank 5, and placed so as to be in contact with the bottom surface of the die 7. Or
You may put on the upper end part of the die part 7 so that the die part 7 may be covered.
【0029】仕上鍛造用金型は特に図示しないが、構造
は荒鍛造用金型とほぼ同じとし、表面粗さは荒鍛造用金
型に比べて小さく、4μmRaとしている。これは、荒
鍛造成形体の表面付近と金型との接触面でのメタルフロ
ーをスムーズに行わせ、成形体1の最終形状を精度良く
出し、また成形体1の表面粗さ、肉厚変動を規定以下に
押さえるためである。Although the finish forging die is not particularly shown, the structure is substantially the same as that of the rough forging die, and the surface roughness is 4 μmRa, which is smaller than that of the rough forging die. This makes the metal flow smoothly in the vicinity of the surface of the rough forged molded body and the contact surface with the mold, accurately obtains the final shape of the molded body 1, and changes the surface roughness and wall thickness of the molded body 1. Is to be kept below the specified value.
【0030】使用する素材5の大きさは、目標とする成
形体1の肉厚、周壁部3の高さ、金型温度及び圧下率な
どの鍛造条件などから、適正な厚さと大きさのものを選
択する。通常、得ようとする成形体1の底部2の形状よ
りも少し大きめの素材5を使用することが好ましい。The size of the raw material 5 to be used is determined based on the target thickness of the compact 1, the height of the peripheral wall 3, the forging conditions such as the mold temperature and the reduction ratio, and the like. Select Usually, it is preferable to use a material 5 slightly larger than the shape of the bottom 2 of the molded body 1 to be obtained.
【0031】素材5の板厚(t1)が2mmのときの板
厚変動に対し、種々の鍛造条件で成形したときの鍛造加
工後の成形体1の主要部の肉厚変動を調べた。その結果
を図4に示す。図4で、矢印は肉厚変動幅を示す。素材
5の板厚変動が±0.3mmを超えると成形体1の主要
部の肉厚変動が70μmを超えるものがある。そして、
成形体1の主要部の肉厚変動が70μmを超えると、相
手部品を実装できなくて不良品となるものがあった。こ
のことから、成形体1の主要部の肉厚変動を70μm以
下とするには、素材5の板厚変動を±0.2mm以下と
し、更に、主要部の肉厚変動を40μm以下とするに
は、素材5の板厚変動を±0.12mm以下にするのが
良いことが分かった。この傾向は、素材5の板厚が3m
m、1.3mmの場合についても調査したが、素材5の
板厚変動による鍛造加工後の成形体1の主要部の肉厚変
動の関係はほぼ同じであった。With respect to the sheet thickness variation when the thickness (t1) of the material 5 was 2 mm, the thickness variation of the main part of the molded body 1 after forging when forming under various forging conditions was examined. FIG. 4 shows the results. In FIG. 4, the arrow indicates the thickness variation width. When the thickness variation of the material 5 exceeds ± 0.3 mm, the thickness variation of the main part of the molded body 1 may exceed 70 μm. And
If the variation in the thickness of the main part of the molded body 1 exceeds 70 μm, the mating parts could not be mounted, and there were some products which became defective. From this, in order to make the thickness variation of the main part of the molded body 1 70 μm or less, it is necessary to make the thickness variation of the raw material 5 ± 0.2 mm or less, and further, make the thickness variation of the main part 40 μm or less. It was found that it was better to make the thickness variation of the material 5 ± 0.12 mm or less. The tendency is that the thickness of the material 5 is 3 m.
The case of m and 1.3 mm was also investigated, but the relationship of the thickness variation of the main part of the formed body 1 after forging due to the thickness variation of the raw material 5 was almost the same.
【0032】[0032]
【実施例】(実施例1)まず、下金型6のダイ部7立ち
上がり内側角部の少なくとも1部の半径が0.6mm、
上金型8のポンチ部9肩部の半径2.5mmの荒鍛造用
金型と、下金型のダイ部立ち上がり内側角部の少なくと
も1部の半径が0.6mm、上金型のポンチ部肩部の少
なくとも1部の半径が0.7mmの仕上鍛造用金型とを
準備した。仕上鍛造用金型の表面粗さは10μmRa以
下とした。次に、等方性で、板厚2.0±0.2mm、
100×100mmの平板状AZ31マグネシウム合金
の素材5をアルゴンガスで充満した電気式加熱炉内に装
入し、350℃に均一加熱した。次いで、素材5を電気
式加熱炉内から取り出し、荒鍛造用金型の下金型6のダ
イ部7上に載置し、金型温度400℃、鍛造速度200
mm/s、成型荷重100kN/cm2 の鍛造条件で荒
鍛造加工を行い、底部の概略面積が90×95mm、周
壁部の有効高さが8mm、肉厚1.2mmの外観上欠陥
のない荒鍛造成形体を得た。次に、得られた荒鍛造成形
体を電気式加熱炉に装入して350℃に加熱し仕上鍛造
金型で、金型温度350℃、鍛造速度50mm/s、成
形荷重100kN/cm2の鍛造条件で仕上鍛造加工を
行った。そして、底部2の面積が90×95mm、周壁
部3の有効高さが8mm、主要部の肉厚(t)が1.0
mmで、周壁部3立ち上がり部内側半径の少なくとも一
部の半径が0.7mm、主要部の表面粗さが40μmR
a以下、主要部の肉厚変動が70μm以下で、外観上欠
陥のないマグネシウム合金製薄肉成形体1を得ることが
できた。(Example 1) First, the radius of at least one of the rising inner corners of the die 7 of the lower mold 6 is 0.6 mm.
A punch portion 9 of the upper die 8, a rough forging die having a radius of 2.5 mm at a shoulder portion, and a punch portion of an upper die having a radius of at least one portion of an inner corner portion of the lower die rising up to 0.6 mm. A finish forging die having a radius of at least one portion of the shoulder portion of 0.7 mm was prepared. The surface roughness of the finish forging die was 10 μm Ra or less. Next, it is isotropic, the board thickness is 2.0 ± 0.2 mm,
A plate-shaped AZ31 magnesium alloy material 5 of 100 × 100 mm was charged into an electric heating furnace filled with argon gas and uniformly heated to 350 ° C. Next, the raw material 5 is taken out of the electric heating furnace, and placed on the die portion 7 of the lower die 6 of the rough forging die, at a die temperature of 400 ° C. and a forging speed of 200 °.
Rough forging under a forging condition of 100 mm / s and a molding load of 100 kN / cm 2 , a rough area having an approximate bottom area of 90 × 95 mm, an effective height of the peripheral wall of 8 mm, and a wall thickness of 1.2 mm with no defects in appearance. A forged product was obtained. Next, the obtained rough forged molded body was charged into an electric heating furnace and heated to 350 ° C., and was used in a finish forging die at a die temperature of 350 ° C., a forging speed of 50 mm / s, and a forming load of 100 kN / cm 2 . Finish forging was performed under forging conditions. The area of the bottom 2 is 90 × 95 mm, the effective height of the peripheral wall 3 is 8 mm, and the thickness (t) of the main part is 1.0.
mm, the radius of at least a part of the inner radius of the rising portion of the peripheral wall portion 3 is 0.7 mm, and the surface roughness of the main portion is 40 μmR.
a, the thickness variation of the main part was 70 μm or less, and the magnesium alloy thin molded body 1 having no defects in appearance was obtained.
【0033】(実施例2)まず、下金型のダイ部立ち上
がり内側角部の少なくとも1部の半径が0.8mm、上
金型のポンチ部肩部の半径3.5mmの荒鍛造用金型を
準備した。次に、等方性で、板厚1.3±0.1mm、
65×160mmの平板状AZ31マグネシウム合金薄
板の素材5をアルゴンガスで充満した電気式加熱炉内に
装入し、加熱温度を変えて均一加熱した。次いで、素材
5を電気式加熱炉内から取り出し、下金型のダイ部7上
に載置し、金型温度400℃、鍛造速度200mm/
s、成型荷重100kN/cm2 の鍛造条件で荒鍛造加
工を行った。素材5の加熱温度が350〜500℃のも
のは、底部の面積が55×145mm、周壁部の有効高
さが6mm、肉厚0.85mmで、外観上欠陥のない荒
鍛造成形体が得られた。しかし、加熱温度200℃未満
のものは、十分なメタルフローが得られず、板厚の減少
も少なく、また隅部に欠陥が発生していた。このこと
は、鍛造加工時の温度が200℃に達しなかったものと
推測される。一方、加熱温度550℃以上のものは、結
晶粒の粗大化が見られると共に一部溶融部が見られ、表
面性状に劣り、機械的強度の低い成形体であった。(Example 2) First, a die for rough forging having a radius of at least one portion of the inner corner of the lower die rising to 0.8 mm and a radius of 3.5 mm at the shoulder of the punch portion of the upper die. Was prepared. Next, it is isotropic, with a plate thickness of 1.3 ± 0.1 mm,
A plate-shaped AZ31 magnesium alloy sheet material 5 of 65 × 160 mm was placed in an electric heating furnace filled with argon gas, and was uniformly heated by changing the heating temperature. Next, the raw material 5 is taken out from the electric heating furnace, placed on the die 7 of the lower die, and the die temperature is 400 ° C., and the forging speed is 200 mm /.
s, rough forging was performed under a forging condition of a molding load of 100 kN / cm 2 . When the heating temperature of the raw material 5 is 350 to 500 ° C., a rough forged product having a bottom area of 55 × 145 mm, an effective height of the peripheral wall of 6 mm, a wall thickness of 0.85 mm, and having no defects in appearance can be obtained. Was. However, when the heating temperature was lower than 200 ° C., a sufficient metal flow was not obtained, the reduction in the plate thickness was small, and defects were generated at the corners. This is presumed that the temperature during forging did not reach 200 ° C. On the other hand, when the heating temperature was 550 ° C. or higher, the crystal grains were coarsened, and a part of the melt was observed, and the molded product had poor surface properties and low mechanical strength.
【0034】次に、得られた荒鍛造成形体のうち、欠陥
が認められなかった成形体を電気式加熱炉で300℃ま
たは400℃に加熱し、表面粗さを8μmRa以下、金
型温度350℃にした仕上鍛造金型に載置し、鍛造速度
50mm/s、成形荷重100kN/cm2 の鍛造条件
で仕上鍛造加工を行った。その結果、いずれも底部2の
面積が55×145mm、周壁部3の有効高さが7m
m、主要部の肉厚(t)が0.6mm、周壁部3立ち上
がり部内側の少なくとも1部の半径が約1.0mm、表
面粗さが30μmRa、肉厚変動が30μm以下で、良
好な形状、外観のマグネシウム合金製薄肉成形体を得る
ことができた。Next, among the obtained rough forged compacts, the compact without any defects was heated to 300 ° C. or 400 ° C. in an electric heating furnace to have a surface roughness of 8 μm Ra or less and a mold temperature of 350 ° C. The sample was placed on a finish forging die set at a temperature of ° C. and subjected to finish forging under a forging condition of a forging speed of 50 mm / s and a forming load of 100 kN / cm 2 . As a result, the area of the bottom 2 is 55 × 145 mm, and the effective height of the peripheral wall 3 is 7 m.
m, the thickness of the main part (t) is 0.6 mm, the radius of at least one part inside the rising part of the peripheral wall part 3 is about 1.0 mm, the surface roughness is 30 μm Ra, the thickness variation is 30 μm or less, and a good shape. Thus, a thin-walled product made of a magnesium alloy having an appearance was obtained.
【0035】(実施例3)等方性で、板厚変動が2.0
±0.3mmの素材5を準備して、上述した実施例1と
同じ金型を用い同じ鍛造条件で実施した。仕上鍛造加工
でできた成形体1の主要部の肉厚変動を測定したら、7
0μmを超えるものが約40%あり、塗装または表面処
理後にすじむらが見られるものが多く、実用的には採用
できないことが分かった。(Embodiment 3) It is isotropic and the thickness variation is 2.0
A material 5 having a size of ± 0.3 mm was prepared, and was used under the same forging conditions using the same mold as that in Example 1 described above. When the thickness variation of the main part of the molded body 1 formed by the finish forging is measured, 7
About 40% of the particles exceeded 0 μm, and many lines showed unevenness after painting or surface treatment, indicating that they could not be used practically.
【0036】(実施例4) 実施例1、実施例2及び実施例3で得られた成形体1
を、不要部分を取り除くトリミングを行った。次に、こ
れらトリミングの終わった成形体1から、主要部の肉厚
変動及び表面粗さの種々の値の成形体1を準備し、塗装
及び表面処理を施し、表面上にすじむらや反射による表
面皺などがどの程度見えるかの目視外観テストを行っ
た。まず、塗装では、化成処理後下塗りをエポキシ系塗
料にてほぼ8μmの厚さに塗り、次いで上塗りとしてメ
ラミン系塗料を12μmの厚さに塗った。成形体1の表
面粗さが40μmRa以下、肉厚変動が40μm以下の
ものは、外観美観上全く問題無かった。表面粗さが70
μmRa以下、肉厚変動が70μm以下のものも、外観
美観上ほとんど気が付かない程度で、光の加減ではわず
かにすじむらが見えるものもあったが、実用上商品価値
を落とすことにはなく、問題がなかった。また、成形体
1の表面粗さが70μmRa、肉厚変動が70μmを超
えるものは、すじむらや皺が目立つものが多く、外観や
美観上で商品価値に問題を生じ、実用上不適なものが多
かった。(Example 4) The molded article 1 obtained in Example 1, Example 2, or Example 3
Was trimmed to remove unnecessary parts. Next, from the molded body 1 after the trimming, molded bodies 1 having various values of thickness variation and surface roughness of a main part are prepared, subjected to painting and surface treatment, and subjected to unevenness and reflection on the surface. A visual appearance test was performed to see how much surface wrinkles and the like were visible. First, in the coating, after the chemical conversion treatment, an undercoat was applied with an epoxy paint to a thickness of about 8 μm, and then a melamine paint was applied as a top coat to a thickness of 12 μm. When the molded product 1 had a surface roughness of 40 μm Ra or less and a thickness variation of 40 μm or less, there was no problem in appearance and appearance. Surface roughness is 70
Even those with a thickness variation of 70 μm or less and a thickness variation of 70 μm or less were barely noticeable in the appearance and appearance, and there were some that showed slight streaking even when the light was moderated. There was no. In addition, when the molded article 1 has a surface roughness of 70 μm Ra and a variation in thickness of more than 70 μm, many uneven stripes and wrinkles are conspicuous, causing a problem in commercial value in appearance and aesthetic appearance, and those which are not suitable for practical use. There were many.
【0037】陽極酸化皮膜処理では、成形体の表面に金
属光沢が得られたが、皮膜の厚みが10μm前後と薄い
ため、成形体の表面状態がある程度反映された。そし
て、表面粗さが40μmRa以下、肉厚変動が40μm
以下のものでも、光の加減ではわずかにすじむらが見え
るものもあった。表面粗さが40μmRaを超え70μ
mRa以下、肉厚変動が40μmを超え70μm以下の
ものは、光の加減ですじむらが見えるものもあり、外観
美観上で一寸問題になりそうなものが何点かあった。従
って、表面粗さ及び肉厚変動で実用上問題にならない範
囲は、表面粗さが70μmRa以下、望ましくは40μ
mRaが良く、肉厚変動が70μm以下、望ましくは4
0μm以下が良い。In the anodic oxide film treatment, a metallic luster was obtained on the surface of the molded body, but the surface state of the molded body was reflected to some extent because the thickness of the film was as thin as about 10 μm. The surface roughness is 40 μm Ra or less, and the thickness variation is 40 μm.
Some of the following were slightly uneven even when the light was moderate. Surface roughness exceeding 40μmRa and 70μ
With respect to those having mRa of not more than 40 μm and thickness variation of not more than 70 μm, there were some of which showed unevenness due to the adjustment of light, and there were some points which seemed to cause a slight problem in appearance aesthetics. Therefore, the range in which fluctuations in surface roughness and wall thickness do not cause a practical problem is that the surface roughness is 70 μmRa or less, preferably 40 μmRa.
mRa is good and thickness variation is 70 μm or less, preferably 4 μm
0 μm or less is good.
【0038】[0038]
【発明の効果】本発明のマグネシウム合金製薄肉成形体
は、塗装や表面処理後においても、すじむらなどを見え
難くして美観を良くし、また、肉厚変動を少なくして実
装部品の容積や装着性を確保できる。The thin formed body made of a magnesium alloy according to the present invention has a good appearance by suppressing line unevenness even after painting or surface treatment, and has a small thickness variation to reduce the volume of a mounted component. And wearability can be ensured.
【図1】マグネシウム合金製薄肉成形体の一例を示す概
略構成斜視図である。FIG. 1 is a schematic configuration perspective view showing an example of a thin molded product made of a magnesium alloy.
【図2】図1と同じ形状で、図1とは逆の裏から見た比
較例の成形体の概略斜視図である。FIG. 2 is a schematic perspective view of a molded body of a comparative example having the same shape as that of FIG. 1 and viewed from the reverse side of FIG.
【図3】マグネシウム合金素材を塑性加工する荒鍛造用
金型の一例を示す要部断面図である。FIG. 3 is a sectional view of a main part showing an example of a rough forging die for plastically processing a magnesium alloy material.
【図4】マグネシウム合金素材が2mmのときの板厚変
動と、成形体の主要部の肉厚変動の関係を示す図であ
る。FIG. 4 is a diagram showing a relationship between a thickness variation when a magnesium alloy material is 2 mm and a thickness variation of a main part of a compact.
1、1a マグネシウム合金製薄肉成形体 2、2a 底部 3、3a 周壁部 4 すじむら 5 マグネシウム合金素材 6 下金型 7 ダイ部 8 上金型 9 ポンチ部 t 主要部の肉厚 DESCRIPTION OF SYMBOLS 1, 1a Magnesium alloy thin molded body 2, 2a Bottom part 3, 3a Peripheral wall part 4 Unevenness 5 Magnesium alloy material 6 Lower die 7 Die part 8 Upper die 9 Punch part t Thickness of main part
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) C22F 1/00 672 C22F 1/00 672 683 683 685 685A (72)発明者 渡辺 洋 東京都港区芝浦一丁目2番1号 日立金属 株式会社内 (72)発明者 濱 葆夫 栃木県真岡市鬼怒ヶ丘11番地 日立金属株 式会社素材研究所内 Fターム(参考) 4E087 AA02 AA08 AA10 BA03 BA19 CA11 CB01 CB02 CB11 DB18 EA01 EA11 HB06 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification FI FI Theme Court ゛ (Reference) C22F 1/00 672 C22F 1/00 672 683 683 685 685A (72) Inventor Hiroshi Watanabe One Shibaura, Minato-ku, Tokyo No. 2-1 Hitachi Metals Co., Ltd. (72) Inventor Baoo Hama 11 Kinuigaoka, Moka-shi, Tochigi Pref. Hitachi Metals Materials Research Laboratory F-term (reference) 4E087 AA02 AA08 AA10 BA03 BA19 CA11 CB01 CB02 CB11 DB18 EA01 EA11 HB06
Claims (10)
し、塑性加工後の主要部の表面粗さを70μmRa以下
としたことを特徴とするマグネシウム合金製薄肉成形
体。1. A magnesium alloy thin molded body characterized by subjecting a magnesium alloy material to plastic working so that the surface roughness of the main part after the plastic working is reduced to 70 μm Ra or less.
し、塑性加工後の主要部の肉厚変動幅を70μm以下と
したことを特徴とするマグネシウム合金製薄肉成形体。2. A magnesium alloy thin-walled body characterized in that a magnesium alloy material is subjected to plastic working, and a thickness variation width of a main portion after the plastic working is set to 70 μm or less.
し、塑性加工後の主要部の表面粗さを70μmRa以
下、主要部の肉厚変動幅を70μm以下としたことを特
徴とするマグネシウム合金製薄肉成形体。3. A magnesium alloy thin-wall forming wherein a plastic working is performed on a magnesium alloy material, and the surface roughness of the main part after the plastic working is 70 μm Ra or less, and the thickness variation width of the main part is 70 μm or less. body.
の成形体は、主要部の肉厚が1.5mm以下であること
を特徴とするマグネシウム合金製薄肉成形体。4. A thin molded body made of a magnesium alloy according to claim 1, wherein the thickness of the main part is 1.5 mm or less.
の成形体は、塑性加工が熱間鍛造及び/または温間鍛造
であることを特徴とするマグネシウム合金製薄肉成形
体。5. The thin-walled body made of a magnesium alloy according to claim 1, wherein the plastic working is hot forging and / or warm forging.
の成形体は、マグネシウム合金素材が等方性の微細結晶
を有し、板厚変動が±0.2mm以下であることを特徴
とするマグネシウム合金製薄肉成形体。6. The molded product according to claim 1, wherein the magnesium alloy material has isotropic fine crystals, and the thickness variation is ± 0.2 mm or less. A thin-walled product made of a magnesium alloy characterized by the following characteristics.
の成形体は、マグネシウム合金素材の板厚が3mm以下
であることを特徴とするマグネシウム合金製薄肉成形
体。7. The magnesium alloy thin molded body according to claim 1, wherein the magnesium alloy material has a plate thickness of 3 mm or less.
が300μm以下であることを特徴とするマグネシウム
合金製薄肉成形体。8. A thin molded product made of a magnesium alloy, wherein the fine crystals according to claim 6 have an average particle size of 300 μm or less.
の成形体は、表面に表面処理及び/または塗装処理が施
されていることを特徴とするマグネシウム合金製薄肉成
形体。9. A thin molded body made of a magnesium alloy, wherein the molded body according to any one of claims 1 to 8 has a surface subjected to a surface treatment and / or a coating treatment.
載の成形体が、電子機器用部品であることを特徴とする
マグネシウム合金製薄肉成形体。10. A thin molded product made of a magnesium alloy, wherein the molded product according to any one of claims 1 to 9 is a component for an electronic device.
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Family
ID=18611832
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008036699A (en) * | 2006-08-09 | 2008-02-21 | Univ Of Fukui | Thin wall metallic structure, and method of and apparatus for forging thin metallic plate |
WO2014158094A1 (en) * | 2013-03-27 | 2014-10-02 | Sera Engineering Pte Ltd | Method for manufacturing article having thin plate structure and intermediate product thereof |
-
2000
- 2000-03-31 JP JP2000097177A patent/JP2001286969A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008036699A (en) * | 2006-08-09 | 2008-02-21 | Univ Of Fukui | Thin wall metallic structure, and method of and apparatus for forging thin metallic plate |
WO2014158094A1 (en) * | 2013-03-27 | 2014-10-02 | Sera Engineering Pte Ltd | Method for manufacturing article having thin plate structure and intermediate product thereof |
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