JP2014221493A - Press body - Google Patents

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JP2014221493A
JP2014221493A JP2014177950A JP2014177950A JP2014221493A JP 2014221493 A JP2014221493 A JP 2014221493A JP 2014177950 A JP2014177950 A JP 2014177950A JP 2014177950 A JP2014177950 A JP 2014177950A JP 2014221493 A JP2014221493 A JP 2014221493A
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press
press body
corner
bending radius
top plate
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JP2014221493A5 (en
Inventor
龍一 井上
Ryuichi Inoue
龍一 井上
河部 望
Nozomi Kawabe
望 河部
大石 幸広
Yukihiro Oishi
幸広 大石
奥田 伸之
Nobuyuki Okuda
伸之 奥田
森 信之
Nobuyuki Mori
信之 森
正禎 沼野
Masasada Numano
正禎 沼野
北村 貴彦
Takahiko Kitamura
貴彦 北村
宏治 森
Koji Mori
宏治 森
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Priority to JP2014177950A priority Critical patent/JP2014221493A/en
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Publication of JP2014221493A5 publication Critical patent/JP2014221493A5/en
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Abstract

PROBLEM TO BE SOLVED: To provide a press body which has a sharp corner part.SOLUTION: A press body F is a box body which is formed by press-forming a metal plate 1 and includes a top plate part 20 and a side wall part 21 raised from a top plate part 10. An outside bending radius R of a corner part 22 connecting an outside surface 20o of the top plate part 20 and an outside surface 21o of the side wall part 21 to each other is equal to or less than a thickness (t) of the metal plate 1. The press body F can be formed through multistage warm press working. In first press working, a press material P such that a corner part 12 has an inside bending radius rof substantially 0 mm is formed by using a punch 53 whose corner part 12 has an inside bending radius rof substantially 0 mm. In second press working, a press body F having a corner part 22 of R≤t is formed by using a stepped punch 55 to press an end face 11e of the side wall part 11 of a press material P and an inner corner part 12i of the press material P.

Description

本発明は、モバイル電気機器の筐体などに利用されるプレス体に関するものである。特に、角部が鋭利であるプレス体に関するものである。   The present invention relates to a press body used for a casing of a mobile electrical device. In particular, the present invention relates to a pressed body having sharp corners.

携帯電話やノート型PCといったモバイル電気機器類の筐体材料として、アルミニウムやその合金といった金属が利用されている。金属は、一般に、樹脂よりも強度が高く、衝撃に強い。   Metals such as aluminum and its alloys are used as housing materials for mobile electrical devices such as mobile phones and notebook PCs. Metals are generally stronger than resins and resistant to impact.

上記筐体材料として、マグネシウムに種々の添加元素を含有したマグネシウム合金が利用されてきている。マグネシウム合金は、比強度、比剛性に優れるが、六方晶の結晶構造(hcp構造)を有するため常温での塑性加工性に乏しい。従って、筐体などには、ダイカスト法やチクソモールド法による鋳造材が主流である。昨今、マグネシウム合金にプレス加工を施すことが検討されている(特許文献1,2)。   As the casing material, magnesium alloys containing various additive elements in magnesium have been used. A magnesium alloy is excellent in specific strength and specific rigidity, but has a hexagonal crystal structure (hcp structure), and therefore has poor plastic workability at room temperature. Therefore, casting materials by a die casting method or a thixo mold method are mainly used for cases and the like. Recently, it has been studied to press a magnesium alloy (Patent Documents 1 and 2).

特開2002-239644号公報JP 2002-239644 A 特開2007-098470号公報JP 2007-098470 A

筐体の形態は、矩形状の天板と、天板の周縁から立設される四つの側壁とを具える断面]状の箱型が代表的である。この箱型の成形体として、天板と側壁とを繋ぐ角部や、二つの側壁を繋ぐ角部が鋭利な筐体が望まれている。樹脂の射出成形や鋳造を利用すれば、鋭利な角部を有する筐体が形成できると考えられる。しかし、樹脂材や鋳造材は、一般に、金属のプレス体に比較して強度が低い。   A typical form of the casing is a box-shaped box having a rectangular top plate and four side walls erected from the periphery of the top plate. As this box-shaped molded body, a case where a corner portion connecting the top plate and the side wall or a corner portion connecting two side walls is sharp is desired. It is considered that a housing having sharp corners can be formed by using resin injection molding or casting. However, resin materials and cast materials generally have lower strength than metal press bodies.

ここで、箱型の成形体が落下して地面などに衝突する際、衝突時の衝撃が上記角部に加わることが多い。そのため、強度が低い樹脂材や鋳造材では、角部が変形する(潰れる)などして、角部が鋭利な状態を維持することが難しい。   Here, when the box-shaped molded body falls and collides with the ground or the like, an impact at the time of collision is often applied to the corner portion. For this reason, it is difficult to maintain a sharp state of the corner portion by deforming (collapsing) the corner portion of a resin material or cast material having low strength.

本発明は、上記事情を鑑みてなされたものであり、鋭利な角部を有し、強度が高い成形体を提供する。具体的には、本発明は、金属板をプレス成形したプレス体であって、このプレス体を構成する外周面のうち、二面を繋ぐ角部を有する。そして、上記角部の外側曲げ半径Rが、上記金属板の厚さt以下である。   This invention is made | formed in view of the said situation, has a sharp corner | angular part, and provides a molded object with high intensity | strength. Specifically, the present invention is a press body obtained by press-molding a metal plate, and has a corner portion connecting two surfaces among the outer peripheral surfaces constituting the press body. And the outer side bending radius R of the said corner | angular part is below the thickness t of the said metal plate.

上記構成によれば、金属板にプレス成形を施すことで、塑性加工による加工硬化により角部の硬度を高められ、角部などに衝撃が加わっても変形し難く、鋭利な角部を長期に亘り維持することができる。また、本発明プレス体は、金属板にプレス成形を施してなることで、素材自体の強度に加えて、塑性加工による強度の向上が得られ、プレス体全体の強度も高い。更に、本発明プレス体は、上記鋭利な角部を有することで、デザイン的にも洗練されたスタイリッシュな印象を与えることができ、商品として外観に優れ、商品価値が高められると期待される。   According to the above configuration, by pressing the metal plate, the hardness of the corner can be increased by work hardening by plastic working, and it is difficult to be deformed even if an impact is applied to the corner or the like, and the sharp corner is prolonged. Can be maintained for a long time. Further, the press body of the present invention is formed by press-molding a metal plate, so that in addition to the strength of the material itself, an improvement in strength by plastic working is obtained, and the strength of the entire press body is also high. Furthermore, since the press body of the present invention has the sharp corners described above, it is possible to give a stylish impression that is refined in terms of design, and is expected to be excellent in appearance as a product and to enhance the product value.

上記鋭利な角部を有する本発明プレス体は、例えば、以下の多段階のプレス加工を金属からなる素材板に施すことで製造することができる。具体的には、金属板にプレス加工を施して、角部を有するプレス体を製造する方法であって、以下の工程を具える。
素材板の準備工程:金属からなる素材板を用意する。
第一のプレス工程:素材板を200℃以上300℃以下の温度に加熱した状態にして、外周面のうち、二面を繋ぐ角部を少なくとも一つ有するプレス材を製造する。特に、肩部の曲げ半径Rpが実質的に0mmであるパンチを用いて、上記角部のうち、少なくとも一つの角部の内側曲げ半径rが実質的に0mmとなるように第一のプレス加工を施す。
第二のプレス工程:上記プレス材を200℃以上300℃以下の温度に加熱した状態にして、第二のプレス加工を施し、少なくとも一つの角部の外側曲げ半径Rが、金属板の厚さt以下であるプレス体を製造する。特に、プレス材の端面、及び第一のプレス工程で内周面に形成されたr≒0の角部を押圧する段差形状のパンチを用いて、上記内側曲げ半径rが実質的に0mmである角部における外側曲げ半径Rが、上記厚さt以下となるように第二のプレス加工を施す。
The press body of the present invention having the sharp corner portion can be manufactured, for example, by applying the following multi-stage press processing to a material plate made of metal. Specifically, it is a method for producing a press body having corners by pressing a metal plate, and includes the following steps.
Material plate preparation process: A material plate made of metal is prepared.
First pressing step: A press material having at least one corner connecting the two surfaces of the outer peripheral surface is manufactured by heating the material plate to a temperature of 200 ° C. or higher and 300 ° C. or lower. In particular, using a punch having a shoulder bending radius Rp of substantially 0 mm, the first press working so that the inner bending radius r of at least one of the corners is substantially 0 mm. Apply.
Second press step: The above-mentioned press material is heated to a temperature of 200 ° C. or higher and 300 ° C. or lower and subjected to a second press process, and the outer bending radius R of at least one corner is the thickness of the metal plate. The press body which is t or less is manufactured. In particular, the inner bending radius r is substantially 0 mm by using a step-shaped punch that presses the corner of r≈0 formed on the end surface of the press material and the inner peripheral surface in the first pressing step. The second press working is performed so that the outer bending radius R at the corner is equal to or less than the thickness t.

外側曲げ半径Rが金属板の厚さt以下というような鋭利な角部を形成するには、プレスに供する素材板の厚さをできるだけ薄くすると形成し易くなる。しかし、素材板自体を薄くし過ぎると、プレス体の強度が低くなり、モバイル電気機器の筐体に望まれる強度や剛性を満たせなくなる。一方、落下などの際に衝撃が加わり易いプレス体の角部を加工硬化により硬度を増すには、角部を高い加工度で形成することが考えられる。しかし、高い加工度で曲げ成形や絞り成形を行うと、素材板において角部の形成箇所が部分的に引き延ばされて薄くなり、この薄肉化により、強度の低下を招く。   In order to form a sharp corner such that the outer bending radius R is equal to or less than the thickness t of the metal plate, it is easy to form by making the thickness of the material plate used for pressing as small as possible. However, if the material plate itself is made too thin, the strength of the press body becomes low, and the strength and rigidity desired for the casing of the mobile electric device cannot be satisfied. On the other hand, in order to increase the hardness of the corner portion of the pressed body, which is easily subjected to an impact when dropped, by work hardening, it is conceivable to form the corner portion with a high degree of processing. However, when bending or drawing is performed at a high degree of processing, corner portions are partially stretched and thinned on the material plate, and this thinning causes a reduction in strength.

そこで、上記製造方法では、高い加工度のプレス成形を一度に行うのではなく、上述のように多段階に分けて行うことで、角部が極端に薄くなることが無く、薄肉化による強度の低下を抑えられる。そのため、上記製造方法によれば、鋭利な角部を有するプレス体が得られるだけでなく、鋭利な角部を長期に亘り維持することができる。   Therefore, in the manufacturing method described above, press forming with a high workability is not performed at once, but by performing the process in multiple stages as described above, the corners are not extremely thin, and the strength due to thinning is reduced. Reduction can be suppressed. Therefore, according to the said manufacturing method, not only the press body which has a sharp corner | angular part is obtained, but a sharp corner | angular part can be maintained over a long term.

また、上記製造方法によれば加熱状態でプレス加工を行うため、冷間加工ではスプリングバックが生じたり、割れなどが生じるような塑性加工性に劣る金属、例えば、常温での伸びが最大でも20%程度であるマグネシウム合金といった金属であっても、プレス時における加工対象(素材板やプレス材)の伸びを100%以上にすることができる。そして、加工対象が十分な伸びを有することで、角部の外側曲げ半径Rが非常に小さいプレス体を精度良く製造することができる。   In addition, according to the manufacturing method described above, since the press working is performed in a heated state, a metal having inferior plastic workability such as springback or cracking in cold working, for example, a maximum elongation at room temperature of 20 Even a metal such as a magnesium alloy, which is about%, can increase the elongation of the object to be processed (material plate or press material) during pressing to 100% or more. Then, when the object to be processed has sufficient elongation, a press body having a very small outside bending radius R at the corner can be manufactured with high accuracy.

更に、上記製造方法によれば、外周面がつくる角部、即ち、外観をつくる角部が鋭利であるだけでなく、内周面がつくる角部も鋭利になるため、プレス体の内部空間が広い。従って、上記製造方法により得られたプレス体を筐体に利用する場合、筐体の内部に各種の部品を十分に収納することができる。   Furthermore, according to the above manufacturing method, not only the corners created by the outer peripheral surface, that is, the corners creating the external appearance are sharp, but also the corners created by the inner peripheral surface are sharpened. wide. Therefore, when the press body obtained by the above manufacturing method is used for a casing, various components can be sufficiently stored inside the casing.

以下、本発明をより詳細に説明する。
<プレス体>
《組成》
本発明プレス体を構成する金属は、200℃以上300℃以下の温度域においてプレス成形性に優れる種々のものが利用できる。特に、マグネシウムやその合金は、軽量で、かつ強度も高く、耐衝撃性にも優れ、軽量化が望まれるモバイル電子機器の筐体などの構成材料に好ましい。
The present invention will be described in detail below.
<Press body>
"composition"
The metal which comprises this invention press body can utilize the various thing which is excellent in press moldability in the temperature range of 200 to 300 degreeC. In particular, magnesium and its alloys are preferable for a constituent material such as a casing of a mobile electronic device that is lightweight, has high strength, is excellent in impact resistance, and is desired to be lightweight.

マグネシウム合金は、Mgに添加元素を含有した種々の組成のもの(残部:Mg及び不純物)が利用できる。例えば、Mg-Al系、Mg-Zn系、Mg-RE(希土類元素)系、Y添加合金などが挙げられる。特に、Alを含有するMg-Al系合金は、耐食性が高い。Mg-Al系合金は、例えば、ASTM規格におけるAZ系合金(Mg-Al-Zn系合金、Zn:0.2〜1.5質量%)、AM系合金(Mg-Al-Mn系合金、Mn:0.15〜0.5質量%)、AS系合金(Mg-Al-Si系合金、Si:0.6〜1.4質量%)、Mg-Al-RE(希土類元素)系合金などが挙げられる。Al量は、1.0〜11質量%以下が好ましく、特に、Alを8.3〜9.5質量%、Znを0.5〜1.5質量%含有するMg-Al系合金、代表的にはAZ91合金は、AZ31合金といった他のMg-Al系合金と比較して、耐食性や強度、耐塑性変形性といった機械的特性に優れる。Znを含有するMg-Zn系合金は、例えば、ASTM規格におけるZK系合金(Mg-Zn-Zr系合金、Zn:3.5〜6.2質量%、Zr:0.45質量%以上)などが挙げられる。   Magnesium alloys having various compositions containing an additive element in Mg (remainder: Mg and impurities) can be used. For example, Mg-Al, Mg-Zn, Mg-RE (rare earth element), Y-added alloy and the like can be mentioned. In particular, Mg-Al alloys containing Al have high corrosion resistance. Mg-Al alloys include, for example, AZ alloys (Mg-Al-Zn alloys, Zn: 0.2 to 1.5 mass%) and AM alloys (Mg-Al-Mn alloys, Mn: 0.15 to 0.5 in ASTM standards) Mass%), AS alloys (Mg—Al—Si alloys, Si: 0.6 to 1.4 mass%), Mg—Al—RE (rare earth elements) alloys, and the like. The amount of Al is preferably 1.0 to 11% by mass or less, and in particular, an Mg-Al alloy containing 8.3 to 9.5% by mass of Al and 0.5 to 1.5% by mass of Zn, typically AZ91 alloy is AZ31 alloy, etc. Compared to Mg-Al based alloys, it has excellent mechanical properties such as corrosion resistance, strength, and plastic deformation resistance. Examples of the Mg-Zn alloy containing Zn include ZK alloys (Mg-Zn-Zr alloys, Zn: 3.5 to 6.2 mass%, Zr: 0.45 mass% or more) in the ASTM standard.

《形状》
本発明プレス体は、金属板に曲げ加工や絞り加工といったプレス加工を施されてなり、外周面のうち、二面を繋ぐ角部を少なくとも一つ有する。代表的には、天板部(底面部)と、天板部の周縁から立設される側壁部とを有する形状が挙げられる。より具体的には、矩形板状の天板部と、対向する一対の側壁部のみを有する]状体、対向する一対の側壁部を二組有する断面]状の箱体や、天板部が円板状で、側壁部が円筒状の有蓋筒状体などが挙げられる。天板部や側壁部は、実質的に平行な外側面と内側面とで構成され、本発明プレス体は、二つの外側面を繋ぐ角部が鋭利である。
"shape"
The press body of the present invention is formed by subjecting a metal plate to press working such as bending or drawing, and has at least one corner portion connecting two surfaces of the outer peripheral surface. Typically, a shape having a top plate portion (bottom surface portion) and a side wall portion erected from the periphery of the top plate portion can be mentioned. More specifically, a rectangular plate-shaped top plate portion and only a pair of opposing side wall portions]], a cross section having two sets of opposing pair of side wall portions, or a top plate portion Examples thereof include a covered cylindrical body having a disk shape and a cylindrical side wall portion. A top plate part and a side wall part are comprised by the substantially parallel outer side surface and inner side surface, and, as for this invention press body, the corner | angular part which connects two outer side surfaces is sharp.

上記天板部及び側壁部の形態は、代表的には、平坦な面からなり、形状・大きさは特に問わない。ボスなどを一体に成形又は接合していたり、表裏に貫通する孔や厚さ方向に凹んだ溝を有していたり、段差形状になっていたり、塑性加工や切削加工などにより局所的に厚さが異なる部分を有していてもよい。角部以外の箇所は、上記ボスや凹み、厚さが異なる部分を除くと、厚さが概ね一定である。従って、プレス体を構成する金属板の厚さtとは、上記ボスなど、及び角部を除く部分全体の平均厚さとする。具体的には、上記ボスなどを除く部分から測定点を5点以上選択し、その平均とする。天板部が平坦な面からなる場合、上記厚さtは、天板部全体の平均厚さとしてもよい。この厚さtは、素材板の厚さに概ね依存し、プレス加工により圧縮されていない場合、実質的に素材板の厚さと同じである。   The form of the top plate part and the side wall part is typically a flat surface, and the shape and size are not particularly limited. Thickness is locally formed by molding or joining bosses integrally, having holes penetrating the front and back, grooves recessed in the thickness direction, stepped shapes, plastic processing, cutting processing, etc. May have different parts. The portions other than the corners are substantially constant except for the bosses, dents, and portions having different thicknesses. Therefore, the thickness t of the metal plate constituting the pressed body is the average thickness of the entire portion excluding the boss and the corners. Specifically, five or more measurement points are selected from the portion excluding the boss and the like, and the average is obtained. When the top plate portion is a flat surface, the thickness t may be the average thickness of the entire top plate portion. This thickness t generally depends on the thickness of the material plate, and is substantially the same as the thickness of the material plate when not compressed by pressing.

上記金属板の厚さtが0.4mm以上2.0mm以下であると、強度に優れるプレス体となり、0.4mm未満であると、素材板が薄いことから、外側曲げ半径Rがより小さいものを形成し易いため、スタイリッシュ感などの外観により優れるプレス体となる。また、金属板の厚さtが2.0mm以下、特に、1.5mm以下、更に0.6mm以下であると、本発明プレス体をモバイル電子機器の筐体などに好適に利用できると期待される。   When the thickness t of the metal plate is 0.4 mm or more and 2.0 mm or less, a pressed body having excellent strength is obtained. When the thickness t is less than 0.4 mm, the material plate is thin, so that the outer bending radius R is smaller. Since it is easy, it becomes a press body excellent in appearance such as a stylish feeling. Further, when the thickness t of the metal plate is 2.0 mm or less, particularly 1.5 mm or less, and further 0.6 mm or less, it is expected that the press body of the present invention can be suitably used for a housing of a mobile electronic device.

そして、本発明プレス体は、外周面のうち、二面を繋ぐ角部の少なくとも一つの角部の外側曲げ半径RがR≦tを満たすところを最大の特徴とする。従来の金属板からなるプレス体は、外側曲げ半径が金属板の厚さよりも大きなものであり、従来、R≦tを満たすものは無かった。これに対し、本発明プレス体は、R≦tを満たす角部を少なくとも一つ有する。本発明プレス体に存在する全ての角部がR≦tを満たす場合、スタイリッシュ感を更に高められると期待される。   The press body of the present invention is characterized in that the outer bending radius R of at least one corner portion connecting the two surfaces of the outer peripheral surface satisfies R ≦ t. A press body made of a conventional metal plate has an outer bending radius larger than the thickness of the metal plate, and there has been no press body satisfying R ≦ t. In contrast, the press body of the present invention has at least one corner that satisfies R ≦ t. When all the corners present in the press body of the present invention satisfy R ≦ t, it is expected that the stylish feeling can be further enhanced.

特に、外側曲げ半径RがR≦(2/3)×tを満たすと、角部の硬度を角部以外の箇所、例えば、天板部よりも高め易く、角部の耐衝撃性を向上することができる。R≦(1/2)×tを満たすと、角部の耐衝撃性の向上、スタイリッシュ感の向上を更に高められる。より具体的には、外側曲げ半径Rが0.1〜0.3mmであることが好ましい。外側曲げ半径Rを0.1mm以上とすることで、鋭利な角部により切創などが生じる恐れを低減でき、0.3mm以下とすることで、良好な外観を有しつつ、耐衝撃性に優れる角部とすることができる。外側曲げ半径Rを小さくするには、例えば、第二のプレス工程でのプレス圧力を高めることなどが挙げられる。   In particular, when the outer bending radius R satisfies R ≦ (2/3) × t, it is easier to increase the hardness of the corner than the corner, for example, the top plate, and improve the impact resistance of the corner. be able to. When R ≦ (1/2) × t is satisfied, the impact resistance at the corners and the stylish feeling can be further improved. More specifically, the outer bending radius R is preferably 0.1 to 0.3 mm. By setting the outer bend radius R to 0.1 mm or more, the risk of cuts and the like due to sharp corners can be reduced. By setting the outer bend radius R to 0.3 mm or less, the corner has excellent impact resistance while having a good appearance. Part. In order to reduce the outer bending radius R, for example, increasing the pressing pressure in the second pressing step may be mentioned.

上記製造方法により得られたプレス体は、R≦tを満たす角部において、内側曲げ半径rが実質的に0mmになる。即ち、内周面のうち、上記角部の内側に位置する二面が実質的に直交した状態にある。このようなプレス体は、内側曲げ半径r>0のプレス体と比較して、内部空間が広く、内部に種々の部品を収納する筐体に好適に利用することができる。   In the press body obtained by the above manufacturing method, the inner bending radius r is substantially 0 mm at the corners satisfying R ≦ t. That is, of the inner peripheral surface, the two surfaces located inside the corner are substantially orthogonal. Such a press body has a wider internal space than a press body having an inner bending radius r> 0, and can be suitably used for a housing that houses various components therein.

《製造方法》
[素材板の用意]
素材板として、マグネシウム合金からなるものを利用する場合、双ロール法といった連続鋳造法、特に、WO/2006/003899に記載の鋳造方法で製造した鋳造板に複数回の圧延を施した圧延板を利用することが好ましい。連続鋳造法は、急冷凝固が可能であるため、酸化物や偏析などを低減でき、圧延加工性に優れる鋳造板が得られる。鋳造板には、溶体化処理(加熱温度:380〜420℃、加熱時間:60〜600分)や時効処理といった熱処理を施すと、組成を均質化することができる。特に、Alの含有量が高いマグネシウム合金の場合、長時間溶体化を行うことが好ましい。鋳造板の大きさは特に問わないが、厚過ぎると偏析が生じ易いため、10mm以下、特に5mm以下が好ましい。
"Production method"
[Preparation of material board]
When a material made of a magnesium alloy is used as a material plate, a rolled plate obtained by subjecting a cast plate produced by a continuous casting method such as a twin-roll method, in particular, a casting method described in WO / 2006/003899, to rolling a plurality of times. It is preferable to use it. Since the continuous casting method can be rapidly solidified, it is possible to reduce oxides and segregation and to obtain a cast plate excellent in rolling workability. When the cast plate is subjected to a heat treatment such as a solution treatment (heating temperature: 380 to 420 ° C., heating time: 60 to 600 minutes) or an aging treatment, the composition can be homogenized. In particular, in the case of a magnesium alloy having a high Al content, it is preferable to perform solution treatment for a long time. The size of the cast plate is not particularly limited, but segregation is likely to occur if it is too thick, and therefore it is preferably 10 mm or less, particularly 5 mm or less.

上記鋳造板に複数回の圧延を施すことで、所望の板厚とすると共に、平均結晶粒径を小さくしたり、AZ91合金などのAlを多く含むマグネシウム合金の場合、粗大な晶析出物といった欠陥を消滅することができ、プレス加工性を高められる。圧延は、公知の条件、例えば、マグネシウム合金の場合、特許文献2に開示される制御圧延などを組み合わせて利用してもよい。また、圧延加工途中に中間熱処理(加熱温度:250〜350℃、加熱時間:20〜60分)を行い、中間熱処理までの加工により加工対象に導入された歪みや残留応力、集合組織などを除去、軽減すると、その後の圧延で不用意な割れや歪み、変形を防止して、より円滑に圧延を行える。得られた圧延板に300℃以上の熱処理を行って、圧延による加工歪みを除去すると共に、完全に再結晶化させたり、得られた圧延板を加熱した状態でロールレベラなどにより歪みを付与して、プレス加工時に再結晶化されるようにしてもよい。   By rolling the cast plate a number of times, the desired plate thickness is achieved, and the average crystal grain size is reduced, or in the case of magnesium alloys containing a large amount of Al, such as AZ91 alloy, defects such as coarse crystal precipitates Can be eliminated, and press workability can be improved. The rolling may be used in combination with known conditions, for example, in the case of a magnesium alloy, controlled rolling disclosed in Patent Document 2. In addition, intermediate heat treatment (heating temperature: 250 to 350 ° C, heating time: 20 to 60 minutes) is performed in the middle of rolling to remove strain, residual stress, texture, etc. introduced into the workpiece by processing up to the intermediate heat treatment. When reduced, the subsequent rolling can prevent inadvertent cracking, distortion, and deformation, and can perform rolling more smoothly. The obtained rolled plate is subjected to heat treatment at 300 ° C. or higher to remove the processing distortion due to rolling, and completely recrystallize, or the obtained rolled plate is heated and applied with a roll leveler or the like. Further, it may be recrystallized during press working.

[プレス加工]
多段に亘るプレス加工はいずれの段階も、加工対象(素材板、プレス材)が塑性変形性を高められるように200〜300℃の温度域で行うことが好ましい。
[Press working]
It is preferable that the multi-stage press work is performed in a temperature range of 200 to 300 ° C. so that the work target (material plate, press material) can be improved in plastic deformation.

第一のプレス加工では、肩部の曲げ半径Rp≒0(好ましくは、曲げ半径Rpが0.3mm以下)のパンチを用いて、内側に鋭利な角部(実質的に直角)を有するプレス材、即ち、内周面のうち、二面がつくる角部が直交したプレス材を形成する。第二のプレス加工では、プレス材の端面と共に、上記内側の角部を段差形状のパンチにより押圧して、ダイの角部に素材板の構成材料を押し集めて、プレス材の外側に鋭利な角部が形成されるように、押し集めた構成材料を変形させる。プレス加工の際には、可動ダイや凹状ダイなど、適宜なダイを用いる。   In the first press work, using a punch having a shoulder bending radius Rp≈0 (preferably a bending radius Rp of 0.3 mm or less), a press material having a sharp corner (substantially perpendicular) on the inside, That is, a press material in which corners formed by two surfaces of the inner peripheral surface are orthogonal to each other is formed. In the second pressing process, the inner corners of the press material are pressed together with the step-shaped punches together with the end face of the press material, and the constituent materials of the material plate are pressed and collected at the corners of the die, and the outer side of the press material is sharpened. The assembled material is deformed so that corners are formed. In the press working, an appropriate die such as a movable die or a concave die is used.

プレス成形後に熱処理を施し、プレス加工により導入された歪みや残留応力の除去、機械的特性の向上を図ってもよい。熱処理条件は、加熱温度:100〜450℃、加熱時間:5分〜40時間程度が挙げられる。また、プレス後に得られたプレス体は、防食、保護、装飾などを目的とした被覆層を具えると、耐食性や商品価値などを更に高められる。   Heat treatment may be performed after press forming to remove distortion and residual stress introduced by press working and improve mechanical properties. Examples of the heat treatment conditions include a heating temperature: 100 to 450 ° C. and a heating time: about 5 minutes to 40 hours. Moreover, if the press body obtained after the press is provided with a coating layer for the purpose of anticorrosion, protection, decoration, etc., the corrosion resistance and the commercial value can be further enhanced.

本発明プレス体は、角部が鋭利であり、強度が高い。   The press body of the present invention has sharp corners and high strength.

鋭利な角部を有するプレス体の製造工程において、プレス加工の手順を説明する断面模式図であって、(A)は、素材板を金型に配置した状態、(B)は、第一のプレス加工により、断面]状のプレス材を形成した状態、(C)は、第二のプレス加工においてパンチにより押圧している状態、(C’)は、(C)において角部の部分拡大図、(D)は、第二のプレス加工により、鋭利な角部を有するプレス体を形成した状態、(E)は、得られたプレス体を示す。In the manufacturing process of a press body having sharp corners, it is a schematic cross-sectional view explaining the procedure of pressing, (A) is a state in which the material plate is arranged in the mold, (B) is the first A state in which a cross-sectional] shaped press material is formed by pressing, (C) is a state in which it is pressed by a punch in the second pressing, and (C ′) is a partially enlarged view of a corner in (C). , (D) shows a state in which a press body having sharp corners is formed by the second pressing, and (E) shows the obtained press body.

以下、本発明の実施の形態を説明する。
[試験例1]
マグネシウム合金からなり、角部を有するプレス体を複数作製し、角部の外側曲げ半径R、プレス体の硬度を調べた。
Embodiments of the present invention will be described below.
[Test Example 1]
A plurality of press bodies made of a magnesium alloy and having corner portions were produced, and the outer bending radius R of the corner portions and the hardness of the press body were examined.

AZ91合金相当の組成(Mg-9.0%Al-1.0%Zn(全て質量%))を有するマグネシウム合金からなり、双ロール連続鋳造法により得られた鋳造板(厚さ4mm)を複数用意した。得られた各鋳造板に、ロール温度:150〜250℃、板温度:200〜400℃、1パスあたりの圧下率を10〜50%の圧延条件で、厚さが0.6mmになるまで複数回圧延を施した。得られた板材に抜打ち加工を行い、プレス成形用のブランク板(素材板)を用意した。   A plurality of cast plates (thickness 4 mm) made of a magnesium alloy having a composition equivalent to AZ91 alloy (Mg-9.0% Al-1.0% Zn (all by mass%)) and obtained by a twin roll continuous casting method were prepared. Rolling temperature: 150 to 250 ° C, plate temperature: 200 to 400 ° C, rolling rate of 10 to 50% per rolling, multiple times until thickness becomes 0.6mm Rolled. The obtained plate material was punched out to prepare a blank plate (material plate) for press molding.

用意したブランク板に二段に亘ってプレス加工を施した。図1は、プレス加工の手順を説明する断面模式図である。なお、図1では、ブランク板を強調して示す。   The prepared blank plate was pressed in two stages. FIG. 1 is a schematic cross-sectional view for explaining a pressing process. In FIG. 1, the blank plate is highlighted.

第一のプレス加工では、図1(B),(C)に示すような平坦な天板部10と、天板部10から立設する一対の平坦な側壁部11を二組有する断面]状のプレス材P(外寸:45mm×95mm×6mmの箱体)を製造する。具体的には、図1(A)に示すように、板厚t:0.6mmのブランク板Bをプレート51及びダイプレート52の上に配置して、パンチ53及び押さえプレート54で挟み、プレート51とパンチ53とでブランク板Bを挟持した状態でパンチ53を図1において下方に移動させて、断面]状に成形する。パンチ53は、肩部の曲げ半径Rpが実質的に0mmであり、肩部を構成する二面が直交した構成である。このプレス加工により得られたプレス材Pは、天板部10の外側面10oと、側壁部11の外側面11oとを繋ぐ角部12の外側曲げ半径R0が、天板部10の厚さt0よりも大きく(R0>t0)、天板部10の内側面10iと、側壁部11の内側面11iとは、直交している。即ち、角部12の内側曲げ半径r0が実質的に0mmである。なお、プレート51,ダイプレート52,パンチ53,押さえプレート54、後述する段差パンチ55,ダイ56は、図示しない加熱手段により加熱可能である。第一のプレス加工では、加熱温度を200℃以上とした。 In the first press working, a cross-section having two sets of a flat top plate portion 10 as shown in FIGS. 1 (B) and 1 (C) and a pair of flat side wall portions 11 erected from the top plate portion 10] Press material P (outer dimensions: 45 mm × 95 mm × 6 mm box). Specifically, as shown in FIG. 1 (A), a blank plate B having a thickness t: 0.6 mm is disposed on the plate 51 and the die plate 52, and is sandwiched between the punch 53 and the pressing plate 54, and the plate 51 In a state where the blank plate B is sandwiched between the punch 53 and the punch 53, the punch 53 is moved downward in FIG. The punch 53 has a configuration in which the shoulder bend radius Rp is substantially 0 mm and the two surfaces constituting the shoulder are orthogonal to each other. The press material P obtained by this press working has an outer bending radius R0 of the corner portion 12 connecting the outer surface 10o of the top plate portion 10 and the outer surface 11o of the side wall portion 11 is the thickness of the top plate portion 10. It is larger than t 0 (R 0 > t 0 ), and the inner side surface 10 i of the top plate portion 10 and the inner side surface 11 i of the side wall portion 11 are orthogonal to each other. That is, the inner bending radius r 0 of the corner portion 12 is substantially 0 mm. The plate 51, the die plate 52, the punch 53, the pressing plate 54, the step punch 55, which will be described later, and the die 56 can be heated by a heating means (not shown). In the first press working, the heating temperature was set to 200 ° C. or higher.

第二のプレス加工では、例えば、図1(C),(D)に示すような凸状の段差パンチ55と、断面]状の凹部を有するダイ56とを用いてプレス材Pの側壁部11の端面11eを押圧して、外側曲げ半径Rが金属板1の厚さt以下である鋭利な角部を有するプレス体Fを製造する。段差パンチ55は、側壁部11の端面11eを押圧する端部押圧面55pと、プレス材Pの内周面において、ほぼ直角な内角部12iに接触して、この内角部12iを押圧する肩部55sとを有する。ダイ56の凹部は、底面56bと側面56sとが直交しており、角部が直角である。   In the second press work, for example, the side wall 11 of the press material P is formed using a convex stepped punch 55 as shown in FIGS. 1 (C) and 1 (D) and a die 56 having a concave section in cross section]. By pressing the end face 11e, a press body F having sharp corners whose outer bending radius R is equal to or less than the thickness t of the metal plate 1 is manufactured. The step punch 55 has an end pressing surface 55p that presses the end surface 11e of the side wall 11 and a shoulder that presses the inner corner 12i in contact with the substantially perpendicular inner corner 12i on the inner peripheral surface of the press material P. With 55s. In the concave portion of the die 56, the bottom surface 56b and the side surface 56s are orthogonal to each other, and the corners are perpendicular.

図1(C),(C’)に示すように、箱型のプレス材Pの外形に嵌合する凹部を有するダイ56にプレス材Pを配置した状態で、段差パンチ55によりプレス材Pの内側を押圧する。このとき、段差パンチ55の端部押圧面55pがまず側壁部11の端面11eを押圧し、更に、段差パンチ55を下方に押圧し続けると、段差パンチ55の主押圧面55mが天板部10の内側面10iに接触して押圧する。そして、プレス材Pの内角部12iが段差パンチ55の肩部55sにより押圧されることで、側壁部11の一部及び天板部10の一部の構成材料がダイ56の凹部の角部に押し集められて、凹部の角部に倣って、プレス材Pに鋭角な角部が形成される。なお、側壁部11の端面11eを均一的に押圧し易いように、第一のプレスにより得られたプレス材の側壁部の一部をサイドカット加工して、プレス材の側壁部の高さを5.5mmに揃えてから、第二のプレス加工を行った。また、第二のプレス加工では、プレス時の圧力を異ならせることで、外側曲げ半径Rの大きさを異ならせた。   As shown in FIGS. 1 (C) and 1 (C ′), in a state where the press material P is disposed on the die 56 having a recess that fits into the outer shape of the box-shaped press material P, Press inside. At this time, when the end pressing surface 55p of the step punch 55 first presses the end surface 11e of the side wall 11, and further continues to press the step punch 55 downward, the main pressing surface 55m of the step punch 55 becomes the top plate portion 10. The inner side surface 10i is contacted and pressed. Then, the inner corner portion 12i of the press material P is pressed by the shoulder portion 55s of the step punch 55, so that a part of the constituent material of the side wall portion 11 and a part of the top plate portion 10 is applied to the corner portion of the recess of the die 56. As a result of being pushed together, acute corners are formed in the press material P along the corners of the recesses. In addition, in order to easily press the end surface 11e of the side wall part 11, a part of the side wall part of the press material obtained by the first press is side-cut processed to increase the height of the side wall part of the press material. After aligning to 5.5 mm, the second press work was performed. In the second press working, the outer bending radius R was varied by varying the pressure during pressing.

上記工程により、図1(E)に示すように、天板部20の外側面20oと、側壁部21の外側面21oとを繋ぐ角部22の外側曲げ半径Rが、天板部20の厚さt以下であるプレス体Fが得られる。なお、天板部20及び側壁部21の厚さは、ポイントマイクロメータを用いて測定したところ、ブランク板Bの厚さに概ね等しく、0.6mmであった。   1E, the outer bending radius R of the corner portion 22 connecting the outer surface 20o of the top plate portion 20 and the outer surface 21o of the side wall portion 21 is the thickness of the top plate portion 20, as shown in FIG. A pressed body F having a thickness t or less is obtained. The thickness of the top plate portion 20 and the side wall portion 21 was approximately equal to the thickness of the blank plate B when measured using a point micrometer, and was 0.6 mm.

得られたプレス体について、外側曲げ半径R、角部の硬度、天板部の硬度を測定した。その結果を表1に示す。   About the obtained press body, the outer side bending radius R, the hardness of a corner | angular part, and the hardness of a top-plate part were measured. The results are shown in Table 1.

外側曲げ半径R(mm)は、天板部の外側面と側壁部の外側面との稜線に対して直交方向にプレス体を切断し、この断面をバフ研磨(ダイヤモンド砥粒♯200使用)した後、光学顕微鏡(400倍)にて観察し、この観察像を用いて測定した。なお、同様にして、角部の内側曲げ半径r(mm)を測定したところ、実質的に0mmであり、天板部の内側面と側壁部の内側面とが実質的に直交していた。   The outer bending radius R (mm) was cut in a direction perpendicular to the ridgeline between the outer surface of the top plate portion and the outer surface of the side wall portion, and this section was buffed (using diamond abrasive grains # 200). Then, it observed with the optical microscope (400 time), and measured using this observation image. Similarly, when the inner bending radius r (mm) of the corner portion was measured, it was substantially 0 mm, and the inner side surface of the top plate portion and the inner side surface of the side wall portion were substantially orthogonal.

角部の硬度Hvは、天板部の外側面と側壁部の外側面との稜線に対して直交方向にプレス体を切断し、得られた切断片を用いて埋め込み試料を作製し、切断面を鏡面研磨した後、プレス体の切断面において板厚の中央部から測定点を3個選択し、マイクロビッカース硬度計を用いて、各測定点の硬度を測定した。3個の測定点の平均を表1に示す。   The hardness Hv of the corner portion is obtained by cutting the press body in a direction orthogonal to the ridge line between the outer surface of the top plate portion and the outer surface of the side wall portion, and using the obtained cut piece to produce an embedded sample, After mirror polishing, three measurement points were selected from the center of the plate thickness on the cut surface of the pressed body, and the hardness of each measurement point was measured using a micro Vickers hardness tester. Table 1 shows the average of the three measurement points.

天板部の硬度Hvは、プレス体から天板部の一部を切断し、得られた切断片を用いて埋め込み試料を作製し、切断面を鏡面研磨した後、天板部の切断面において板厚の中央部から測定点を3個選択し、マイクロビッカース硬度計を用いて、各測定点の硬度を測定した。3個の測定点の平均を表1に示す。なお、角部と天板部とを含む埋め込み試料を作製して、硬度Hvの測定を行ってもよい。   The hardness Hv of the top plate part is obtained by cutting a part of the top plate part from the press body, producing an embedded sample using the obtained cut piece, and mirror-polishing the cut surface, and then at the cut surface of the top plate part. Three measurement points were selected from the center of the plate thickness, and the hardness at each measurement point was measured using a micro Vickers hardness tester. Table 1 shows the average of the three measurement points. Note that an embedded sample including a corner portion and a top plate portion may be manufactured, and the hardness Hv may be measured.

Figure 2014221493
Figure 2014221493

表1に示すように、上記多段に亘る温間プレス加工を行うことで、外側曲げ半径RがR≦tを満たすプレス体が精度良く得られることが分かる。特に、このようなプレス加工を金属板に施すことで、角部と天板部とが同等の硬度を有することが分かる。従って、これらのプレス体は、角部の強度が高く、落下などの衝撃を受けた際に変形し難いと期待される。   As shown in Table 1, it is understood that a press body in which the outer bending radius R satisfies R ≦ t can be obtained with high accuracy by performing the above-described warm pressing over multiple stages. In particular, it is understood that the corner portion and the top plate portion have the same hardness by applying such pressing to the metal plate. Therefore, these press bodies are expected to have high strength at the corners and are difficult to deform when subjected to impacts such as dropping.

また、外側曲げ半径RがR≦(2/3)×tを満たすと、角部の硬度が向上していることが分かる。この理由は、多段に亘るプレス加工による加工硬化に起因すると考えられる。更に、外側曲げ半径RがR≦(1/2)×tを満たすと、角部の硬度が非常に向上していることが分かる。このようなプレス体では、角部が耐衝撃性に優れて、長期に亘り、鋭利な状態を維持することができると期待される。   It can also be seen that when the outer bending radius R satisfies R ≦ (2/3) × t, the hardness of the corner is improved. This reason is considered to be caused by work hardening by press working in multiple stages. Further, when the outer bending radius R satisfies R ≦ (1/2) × t, it can be seen that the hardness of the corner is greatly improved. In such a pressed body, the corner portion is excellent in impact resistance, and it is expected that a sharp state can be maintained for a long time.

なお、上記試験例1では、一対の側壁部を二組有する箱型の成形体において、天板部と側壁部とを繋ぐ角部の外側曲げ半径RがR≦tを満たす場合を説明したが、側壁部同士を繋ぐ角部の外側曲げ半径RがR≦tを満たすプレス体を製造することもできる。また、一対の側壁部しかない]状のプレス体を製造することもできる。更に、上記試験例1では、段差パンチとして一体成形されたものを説明したが、分割片を組み合わせて利用してもよく、例えば、天板部を主として押圧する分割片と、側壁部の端面及び天板部の一部を押圧する分割片とを具えるものを利用してもよい。   In Test Example 1 described above, in the box-shaped molded body having two pairs of side wall portions, the case where the outer bending radius R of the corner portion connecting the top plate portion and the side wall portion satisfies R ≦ t has been described. In addition, a press body in which the outer bending radius R of the corner portion connecting the side wall portions satisfies R ≦ t can be manufactured. Further, a press body having only a pair of side wall portions can be manufactured. Furthermore, in Test Example 1 described above, what is integrally formed as a step punch has been described, but divided pieces may be used in combination, for example, a divided piece mainly pressing the top plate portion, an end surface of the side wall portion, and You may utilize what comprises the division piece which presses a part of top plate part.

[試験例2]
種々の厚さの素材板を用意して、マグネシウム合金からなるプレス体を作製し、強度及び外観を調べた。
[Test Example 2]
Material plates with various thicknesses were prepared, press bodies made of a magnesium alloy were produced, and the strength and appearance were examined.

試験例1で用意したAZ91合金相当の組成の鋳造板と同様のもの(厚さ4mm)を用意し、圧延回数を変化させて厚さが異なる圧延板を得た(厚さ:0.3〜0.8mm)。得られた各圧延板に試験例1と同様に抜打ち加工を行って、ブランク板を用意した。各ブランク板に、試験例1と同様にして、二段に亘る温間のプレス加工を施し(プレス時の加熱温度は、200〜250℃から適宜選択)、平坦な天板部と、天板部から立設する一対の平坦な側壁部を二組有する断面]状のプレス体を作製した。   The same cast plate (thickness 4 mm) as the composition corresponding to the AZ91 alloy prepared in Test Example 1 was prepared, and rolled plates with different thicknesses were obtained by changing the number of rolling (thickness: 0.3 to 0.8 mm). ). The obtained rolled plates were punched in the same manner as in Test Example 1 to prepare blank plates. Each blank plate is subjected to warm pressing in two stages in the same manner as in Test Example 1 (the heating temperature during pressing is appropriately selected from 200 to 250 ° C.), a flat top plate portion, and a top plate A cross-sectional press body having two sets of a pair of flat side wall portions erected from the portion was produced.

得られた各プレス体について、試験例1と同様にして角部の外側曲げ半径R(mm)を測定した。その結果を表2に示す。   For each of the obtained press bodies, the outer bending radius R (mm) of the corner was measured in the same manner as in Test Example 1. The results are shown in Table 2.

また、プレス体の強度を以下のように測定した。プレス体の天板部が上方を向くように、側壁部を支持脚としてプレス体を配置し、この状態で、天板部の中央に、直径φ38mmの超硬合金球を1kgf(9.8N)の荷重で押し込み、プレス体を永久変形させる。この変形量(天板部の外周面において最も突出した箇所と最も凹んだ箇所との差)を接触式形状測定器により測定し、この変化量をプレス体の強度として評価する。変化量が1mm以上の場合、強度不足と見なし、×と評価し、変化量が1mm未満の場合、十分な強度を有していると見なし、○と評価し、変化量が0.3mm未満の場合、良好な強度を有していると見なし、◎と評価する。この結果を表2に示す。   Further, the strength of the pressed body was measured as follows. Place the press body with the side wall as support legs so that the top plate part of the press body faces upward, and in this state, a 1 kgf (9.8 N) cemented carbide ball with a diameter of φ38 mm is placed in the center of the top plate part. Push in with a load to permanently deform the press body. The amount of deformation (difference between the most protruding portion and the most recessed portion on the outer peripheral surface of the top plate portion) is measured by a contact-type shape measuring instrument, and the amount of change is evaluated as the strength of the pressed body. When the amount of change is 1 mm or more, it is regarded as insufficient strength and evaluated as x.When the amount of change is less than 1 mm, it is considered as having sufficient strength, and is evaluated as ○, and the amount of change is less than 0.3 mm. Therefore, it is regarded as having good strength and evaluated as ◎. The results are shown in Table 2.

外観は、任意の10人を対象としてパネルテストを行い、外側の角部が鋭利で際立っており、スタイリッシュ感があり、意匠性に優れると判断した人が5人以下の場合を×、6〜8人の場合を○、9人以上の場合を◎と評価する。この結果を表2に示す。   Appearance is a panel test for any 10 people, the outer corners are sharp and stand out, there is a sense of stylishness, and there are 5 or less people who are judged to be excellent in design, x, 6 ~ Evaluate as 8 for 8 people and ◎ for 9 or more people. The results are shown in Table 2.

Figure 2014221493
Figure 2014221493

表2に示すように、天板部の厚さtが厚くなるにつれて強度を高められることが分かる。また、外側曲げ半径RがR≦(1/2)tであると、強度が高く、かつ外観にも優れることが分かる。   As shown in Table 2, it can be seen that the strength can be increased as the thickness t of the top plate portion increases. It can also be seen that when the outer bending radius R is R ≦ (1/2) t, the strength is high and the appearance is excellent.

なお、上述した実施形態は、本発明の要旨を逸脱することなく、適宜変更することが可能であり、上述した構成に限定されるものではない。例えば、金属板として、マグネシウム合金の他、アルミニウムやその合金、その他種々の金属からなるものに変更することができる。   The above-described embodiment can be appropriately changed without departing from the gist of the present invention, and is not limited to the above-described configuration. For example, as a metal plate, it can change into what consists of aluminum, its alloy, and other various metals other than a magnesium alloy.

本発明プレス体は、各種の電子機器、特に、モバイル電気機器類の筐体に好適に利用することができる。   The press body of the present invention can be suitably used for various electronic devices, in particular, mobile electrical device housings.

1 金属板
10 天板部 10o 天板部の外側面 10i 天板部の内側面 11 側壁部
11o 側壁部の外側面 11i 側壁部の内側面 11e 側壁部の端面 12 角部
12i 内角部
20 天板部 20o 天板部の外側面 21 側壁部 21o 側壁部の外側面
22 角部
51 プレート 52 ダイプレート 53 パンチ 54 押さえプレート
55 段差パンチ 55m 主押圧面 55p 端部押圧面 55s 肩部 56 ダイ
56b 底面 56s 側面
B ブランク板 P プレス材 F プレス体
1 Metal plate
10 Top plate 10o Outside surface of the top plate 10i Inner surface of the top plate 11 Side wall
11o Side wall outer surface 11i Side wall inner surface 11e Side wall end face 12 Corner
12i Interior corner
20 Top plate 20o Outside surface of top plate 21 Side wall 21o Outside surface of side wall
22 Corner
51 Plate 52 Die plate 53 Punch 54 Holding plate
55 Step punch 55m Main pressing surface 55p End pressing surface 55s Shoulder 56 Die
56b Bottom 56s Side
B Blank plate P Press material F Press body

Claims (9)

金属板をプレス成形したプレス体であって、
前記プレス体を構成する外周面のうち、二面を繋ぐ角部を有しており、
前記角部の外側曲げ半径Rが、前記金属板の厚さt以下であることを特徴とするプレス体。
A press body obtained by press-molding a metal plate,
Of the outer peripheral surface constituting the press body, it has a corner portion connecting the two surfaces,
The press body, wherein an outer bending radius R of the corner portion is equal to or less than a thickness t of the metal plate.
前記外側曲げ半径Rは、R≦(2/3)×tを満たすことを特徴とする請求項1に記載のプレス体。   2. The press body according to claim 1, wherein the outer bending radius R satisfies R ≦ (2/3) × t. 前記外側曲げ半径Rは、R≦(1/2)×tを満たすことを特徴とする請求項2に記載のプレス体。   3. The press body according to claim 2, wherein the outer bending radius R satisfies R ≦ (1/2) × t. 前記角部の硬度が、角部以外の箇所の硬度よりも高いことを特徴とする請求項1〜3のいずれか1項に記載のプレス体。   4. The press body according to claim 1, wherein the hardness of the corner portion is higher than the hardness of a portion other than the corner portion. 前記角部の内側曲げ半径rが実質的に0mmであることを特徴とする請求項1〜4のいずれか1項に記載のプレス体。   The press body according to any one of claims 1 to 4, wherein an inner bending radius r of the corner portion is substantially 0 mm. 前記プレス体は、Al又はZnを含むマグネシウム合金からなることを特徴とする請求項1〜5のいずれか1項に記載のプレス体。   6. The press body according to any one of claims 1 to 5, wherein the press body is made of a magnesium alloy containing Al or Zn. 前記プレス体は、Al及びZnを含むマグネシウム合金からなることを特徴とする請求項1〜5のいずれか1項に記載のプレス体。   The press body according to any one of claims 1 to 5, wherein the press body is made of a magnesium alloy containing Al and Zn. 前記マグネシウム合金は、質量%でA1を8.3%以上9.5%以下、Znを0.5%以上1.5%以下含有し、残部がMg及び不純物からなることを特徴とする請求項7に記載のプレス体。   8. The press body according to claim 7, wherein the magnesium alloy contains, by mass%, A1 in a range of 8.3% to 9.5%, Zn in a range of 0.5% to 1.5%, and the balance consisting of Mg and impurities. 前記外側曲げ半径Rが0.1mm以上0.3mm以下であり、
前記厚さtは、0.4mm以上であることを特徴とする請求項1〜8のいずれか1項に記載のプレス体。
The outer bending radius R is 0.1 mm or more and 0.3 mm or less,
The press body according to any one of claims 1 to 8, wherein the thickness t is 0.4 mm or more.
JP2014177950A 2014-09-02 2014-09-02 Press body Pending JP2014221493A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018051575A (en) * 2016-09-27 2018-04-05 東洋製罐株式会社 Manufacturing method of rectangular can
KR101945794B1 (en) 2017-03-31 2019-02-11 주식회사전우정밀 Press mold apparatus, forming method using the same
WO2023068046A1 (en) * 2021-10-20 2023-04-27 パナソニックホールディングス株式会社 Metal plate and wiring implement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53134762A (en) * 1977-04-28 1978-11-24 Sanei Kinzoku Kogyo Kk Method and device for forming acute bend angle and drawing edge
JPH06210389A (en) * 1993-01-16 1994-08-02 Toyota Tekko Kk Manufacture of bottomed cylindrical part
JPH06218442A (en) * 1993-01-27 1994-08-09 Yutaka Giken Co Ltd Pressing method for expanding thickness
JP2004058111A (en) * 2002-07-30 2004-02-26 National Institute Of Advanced Industrial & Technology Deep drawing method of magnesium alloy plate, and deep-drawn body
JP2006159232A (en) * 2004-12-06 2006-06-22 Tsutsumi Industries Inc Method for forming cross section of sheet metal in press-working method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53134762A (en) * 1977-04-28 1978-11-24 Sanei Kinzoku Kogyo Kk Method and device for forming acute bend angle and drawing edge
JPH06210389A (en) * 1993-01-16 1994-08-02 Toyota Tekko Kk Manufacture of bottomed cylindrical part
JPH06218442A (en) * 1993-01-27 1994-08-09 Yutaka Giken Co Ltd Pressing method for expanding thickness
JP2004058111A (en) * 2002-07-30 2004-02-26 National Institute Of Advanced Industrial & Technology Deep drawing method of magnesium alloy plate, and deep-drawn body
JP2006159232A (en) * 2004-12-06 2006-06-22 Tsutsumi Industries Inc Method for forming cross section of sheet metal in press-working method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018051575A (en) * 2016-09-27 2018-04-05 東洋製罐株式会社 Manufacturing method of rectangular can
WO2018061673A1 (en) * 2016-09-27 2018-04-05 東洋製罐株式会社 Method for producing square can
KR101945794B1 (en) 2017-03-31 2019-02-11 주식회사전우정밀 Press mold apparatus, forming method using the same
WO2023068046A1 (en) * 2021-10-20 2023-04-27 パナソニックホールディングス株式会社 Metal plate and wiring implement

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