JP2012172596A - Method of manufacturing fluid machine blade - Google Patents

Method of manufacturing fluid machine blade Download PDF

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JP2012172596A
JP2012172596A JP2011035608A JP2011035608A JP2012172596A JP 2012172596 A JP2012172596 A JP 2012172596A JP 2011035608 A JP2011035608 A JP 2011035608A JP 2011035608 A JP2011035608 A JP 2011035608A JP 2012172596 A JP2012172596 A JP 2012172596A
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blade
hole
fluid machine
plate
holes
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Shinji Fukao
伸次 深尾
Hiroshi Kawane
浩 川根
Muneya Wakai
宗弥 若井
Takashi Sano
岳志 佐野
Masanari Iino
真成 飯野
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a fluid machine blade, allowing a hole to be easily formed on a surface or inside of a blade body with a complicated shape having a three-dimensionally curved plane.SOLUTION: The method of manufacturing a fluid machine blade 100 includes the steps of: forming holes 2 and 3 on a planar member 1 as the whole or a part of a blade member 10 of a fluid machine, and bending the planar member 1 into a blade shape with the holes filled with fillers.

Description

本発明は、遠心ポンプ、斜流ポンプ、軸流ポンプなどの流体機械の羽根に適用される技術である。   The present invention is a technique applied to blades of a fluid machine such as a centrifugal pump, a mixed flow pump, and an axial flow pump.

一般に、流体機械の羽根は、プレス機械等を用いた板金加工により製作される。
例えば、特許文献１に示されるポンプ用吐出ボウルでは、鋼板を略円筒状に成形して同心状に配置した内胴の外周面と外胴の内周面に接合する案内翼を、鋼板をプレス成形することで製作するようにしている。 In general, a blade of a fluid machine is manufactured by sheet metal processing using a press machine or the like.
For example, in the pump discharge bowl shown in Patent Document 1, a guide blade that joins the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder, which are concentrically formed by forming a steel sheet into a substantially cylindrical shape, is pressed into the steel sheet. It is made by molding.

また、特許文献２に示される遠心ポンプでは、回転する羽根車から出た流体を減速させるディフューザー部と、該ディフューザー部を通過した流体を吐出側に導くリターンベーンと、これらディフューザー部及びリターンベーンが固定される主板とを板金にて製作するようにしている。   Further, in the centrifugal pump disclosed in Patent Document 2, there are a diffuser portion that decelerates the fluid discharged from the rotating impeller, a return vane that guides the fluid that has passed through the diffuser portion to the discharge side, and the diffuser portion and the return vane. The main plate to be fixed is made of sheet metal.

また、引用文献３に示されるポンプでは、回転軸のハブ外周に設けられる羽根車を板金加工により製作するようにしている。   Moreover, in the pump shown by the cited reference 3, the impeller provided in the outer periphery of the hub of a rotating shaft is manufactured by sheet metal processing.

特開２００５−８３２３２号公報JP 2005-83232 A 特開２００４−１８３４８６号公報JP 2004-183486 A 特開２０１０−３１７３８号公報JP 2010-31738 A

ところで、上記引用文献１〜３に示される流体機械の羽根には、冷却空気による冷却効率を高めるため、又は材料の使用量を減少させることによる低コスト化／軽量化を図るために、羽根の翼高さ方向、又は空気の流れ方向に穴を設けることが行われている。しかしながら、翼の内部に穴を形成する場合には、鋳造や機械加工の精度に限界があり、希望通りの穴開け加工ができないという問題があった。
特に、図５に示されるような羽根５０の翼部材５１は、三次元的に湾曲した形状であり、矢印で示すような空気（流体）の流れ方向に沿って、翼内部に穴や溝をする場合、このような三次元形状の翼部材５１への穴加工や溝加工が非常に難しいという問題がある。 By the way, in the blades of the fluid machinery shown in the above cited documents 1 to 3, in order to increase the cooling efficiency by the cooling air or to reduce the cost / weight by reducing the amount of material used, Holes are provided in the blade height direction or the air flow direction. However, when a hole is formed inside the blade, there is a limit to the precision of casting and machining, and there is a problem that the desired drilling cannot be performed.
In particular, the blade member 51 of the blade 50 as shown in FIG. 5 has a three-dimensionally curved shape, and holes and grooves are formed inside the blade along the flow direction of air (fluid) as shown by arrows. In such a case, there is a problem that it is very difficult to drill or groove the wing member 51 having such a three-dimensional shape.

この発明は、上述した事情に鑑みてなされたものであって、三次元的に湾曲した平面を有する、複雑な形状の翼本体の表面又は内部への穴の形成を容易にすることができる流体機械羽根の製造方法を提供するものである。   The present invention has been made in view of the above-described circumstances, and has a three-dimensionally curved plane and can easily form a hole on the surface or inside of a complex-shaped wing body. A method of manufacturing a mechanical blade is provided.

上記課題を解決するために、この発明は以下の手段を提案している。
すなわち、本発明の流体機械羽根の製造方法では、流体機械の翼部材の全部又は一部となる平面状の板状部材に穴を形成する工程と、前記板状部材を羽根形状となるように曲げ加工する工程と、を有することを特徴としている。 In order to solve the above problems, the present invention proposes the following means.
That is, in the fluid machine blade manufacturing method of the present invention, the step of forming a hole in a planar plate-like member that is all or part of the blade member of the fluid machine, and the plate-like member in a blade shape. And a bending process.

そして、上記のような工程を有する本発明では、流体機械の羽根の全部又は一部となる平面状の板状部材に穴を形成した後で、該板状部材を羽根形状となるように曲げ加工するようにしたので、三次元的に湾曲した平面を有する翼本体の表面又は内部への穴加工を容易に行うことができ、かつ鋳造や機械加工の精度に影響されない複雑な穴加工が可能となる。   And in this invention which has the above processes, after forming a hole in the flat plate-shaped member used as all or a part of the blade of a fluid machine, this plate-shaped member is bent so that it may become a blade shape. Since it is processed, it is possible to easily drill holes on the surface or inside of a blade body with a three-dimensionally curved plane, and complex holes that are not affected by the accuracy of casting and machining are possible. It becomes.

また、本発明では、前記板状部材を羽根形状となるように曲げ加工することにより、回転軸のディスクに設置される翼部材となることを特徴とする。   In the present invention, the plate-like member is bent so as to have a blade shape, thereby forming a blade member installed on the disk of the rotating shaft.

また、本発明では、前記穴は、前記翼部材の高さ方向に沿って形成されることを特徴とする。   In the present invention, the hole is formed along a height direction of the wing member.

また、本発明では、前記穴は、前記翼部材の流体の流れ方向に沿って形成されることを特徴とする。   Moreover, in this invention, the said hole is formed along the flow direction of the fluid of the said wing | blade member, It is characterized by the above-mentioned.

そして、上記のように構成された本発明では、板状部材の高さ方向又は流体の流れ方向等に沿って穴を形成した後、板状部材を羽根形状となるように曲げ加工して、回転軸のディスクに設置される翼部材を形成した。そして、板状部材に形成する穴の形態（板状部材の高さ方向又は流体の流れ方向等に沿う穴など）を選択的に形成することで、該翼部材の冷却空気による冷却効率を高める、又は材料の使用量を減少させることによる低コスト化／軽量化を図ることができる。   And in this invention comprised as mentioned above, after forming a hole along the height direction of a plate-shaped member or the flow direction of a fluid, etc., it bends so that a plate-shaped member may become blade shape, A wing member installed on the disk of the rotating shaft was formed. And the cooling efficiency by the cooling air of this wing | blade member is improved by selectively forming the form (hole etc. along the height direction of a plate-shaped member, or the flow direction of a fluid) of the hole formed in a plate-shaped member. Alternatively, it is possible to reduce cost and weight by reducing the amount of material used.

また、本発明では、前記穴形成後にその穴の内部に充填物を詰めることを特徴とする。   In the present invention, a filling material is filled in the hole after the hole is formed.

また、本発明では、前記充填物はフレキシブルな材料であることを特徴とする。   In the present invention, the filler is a flexible material.

そして、上記のように構成された本発明では、穴形成後に内部にフレキシブルな材料等からなる充填物を詰めるようにしたので、その後の板状部材を羽根形状となるように曲げ加工する工程において、該変形によって穴が塞がることを防止でき、羽根形状を有する板状部材に確実に穴を形成することができる。   And in this invention comprised as mentioned above, since it filled the filler which consists of a flexible material etc. inside after hole formation, in the process of bending the subsequent plate-shaped member so that it may become a blade shape The hole can be prevented from being blocked by the deformation, and the hole can be surely formed in the plate-like member having the blade shape.

本発明によれば、流体機械の羽根の全部又は一部となる平面状の板状部材に穴を形成した後で、該板状部材を羽根形状となるように曲げ加工するようにしたので、三次元的に湾曲した平面を有する翼本体の表面又は内部への穴加工を容易に行うことができ、かつ鋳造や機械加工の精度に影響されない複雑な穴加工が可能となる。   According to the present invention, after the hole is formed in the planar plate-like member that is all or part of the blade of the fluid machine, the plate-like member is bent so as to have a blade shape. It is possible to easily drill a hole in the surface or inside of the blade body having a three-dimensionally curved plane, and to perform a complicated hole machining that is not affected by the accuracy of casting or machining.

本発明に係る流体機械羽根の製造方法に関する一実施形態を示す斜視図であって、（Ａ）は板状部材に穴を形成した状態、（Ｂ）は板状部材を曲げ加工した状態、（Ｃ）翼部材をディスクに設置した図である。It is a perspective view which shows one Embodiment regarding the manufacturing method of the fluid machine blade | wing concerning this invention, Comprising: (A) is the state which formed the hole in the plate-shaped member, (B) is the state which bent the plate-shaped member, ( C) It is the figure which installed the wing | blade member in the disk. 板状部材の内部に流体の流れ方向に沿う穴を形成した場合の構成を示す斜視図である。It is a perspective view which shows a structure at the time of forming the hole in alignment with the flow direction of a fluid inside a plate-shaped member. 翼部材の一部に鋳物を用いた構成を示す斜視図である。It is a perspective view which shows the structure which used the casting for a part of wing | blade member. 図３の他の形態を示す斜視図である。It is a perspective view which shows the other form of FIG. 従来より使用されている羽根を示す斜視図である。It is a perspective view which shows the blade | wing conventionally used.

本発明に係る流体機械羽根（インペラ）の製造方法に関する一実施形態について、図１〜図４を参照して説明する。
図１（Ａ）は本発明が適用される平面状の板状部材１であって、プレス機等による曲げ加工（後述する）により、最終的には、三次元的に湾曲した形状を有する部材、例えば流体機械の羽根となる。 An embodiment relating to a method of manufacturing a fluid machine blade (impeller) according to the present invention will be described with reference to FIGS.
FIG. 1A is a planar plate-like member 1 to which the present invention is applied, and finally a member having a three-dimensionally curved shape by bending (described later) with a press or the like. For example, it becomes a blade of a fluid machine.

前記平面状の板状部材１には、旋盤などの機械加工によって複数の穴２〜４を形成する。例えば、図１（Ａ）に示されるような板状部材１を厚さ方向に貫通する穴２、板状部材１を高さ方向に貫通する穴３、板状部材１を長さ方向に貫通する穴４、などを必要に応じて選択的に形成する。   A plurality of holes 2 to 4 are formed in the planar plate-like member 1 by machining such as a lathe. For example, as shown in FIG. 1A, a hole 2 that penetrates the plate-like member 1 in the thickness direction, a hole 3 that penetrates the plate-like member 1 in the height direction, and a hole that penetrates the plate-like member 1 in the length direction. The holes 4 to be formed are selectively formed as necessary.

なお、ここで言う穴２〜４とは、流体機械羽根として使用している場合に、空気などの流体が流れる流路を指すものであり、図１に示す貫通孔の他に、板状部材１の表面に形成された丸溝、Ｖ字状溝のような凹部も含むものとする。また、前記穴２〜４は、冷却空気による冷却効率を高めるため、又は材料の使用量を減少させることによる低コスト化／軽量化などの用途に用いられる。さらに、前記穴２〜４は用途に応じて選択的に形成するものであるが、これに加えて図２に示されるように、板状部材１の表面から流体の流れる方向に沿って非直線状に内部を貫通する穴５のような形態であっても良い。   Here, the holes 2 to 4 refer to flow paths through which fluid such as air flows when used as fluid machine blades. In addition to the through holes shown in FIG. It is assumed that a concave portion such as a round groove or a V-shaped groove formed on the surface of 1 is also included. Further, the holes 2 to 4 are used for applications such as cost reduction / lightening by increasing the cooling efficiency by cooling air or by reducing the amount of material used. Furthermore, although the said holes 2-4 are selectively formed according to a use, in addition to this, as FIG. 2 shows, it is non-linear along the flow direction of the fluid from the surface of the plate-shaped member 1. It may be in the form of a hole 5 penetrating through the inside.

次に、図１（Ｂ）に示されるように、プレス機械等を用いた板金曲げ加工により、前記穴２が形成された前記板状部材１を三次元的に湾曲した羽根形状とし、これにより翼部材１０を形成する。
その後、図１（Ｃ）に示されるように、該翼部材１０を回転軸１１のディスク１２に一定間隔となるように取り付けることにより流体機械羽根１００を完成する。 Next, as shown in FIG. 1B, the plate-like member 1 in which the holes 2 are formed is formed into a three-dimensionally curved blade shape by sheet metal bending using a press machine or the like. The wing member 10 is formed.
Thereafter, as shown in FIG. 1 (C), the wing member 10 is attached to the disk 12 of the rotating shaft 11 at a constant interval, thereby completing the fluid mechanical blade 100.

ここで、翼部材１０はそれ自体を回転軸１１のディスク１２に設置しても良いが、図３に示すように一部を鋳物１３として翼部材２０を構成しても良い。
図３で示す翼部材２０は、鋳物１３の表面に図１（Ａ）〜（Ｃ）で作成した翼部材１０を貼り付けることにより構成したものであるが、これに限定されず、図４に示すように、鋳物１３を囲むように図１（Ａ）〜（Ｃ）で作成した翼部材１０を取り付けることにより翼部材２０を構成しても良い。また、図３及び図４では鋳物１３を使用しているが、板金加工により得た金属部材を使用しても良い。
そして、このような構成した翼部材１０を含む翼部材２０では、図３及び図４に矢印で示すように穴５を経由した空気（流体）の流路を形成することができ、翼部材の冷却空気による冷却効率を高める等の効果を得ることができる。 Here, the wing member 10 itself may be installed on the disk 12 of the rotating shaft 11, but as shown in FIG.
The wing member 20 shown in FIG. 3 is configured by pasting the wing member 10 created in FIGS. 1A to 1C on the surface of the casting 13, but is not limited to this. As shown, the wing member 20 may be configured by attaching the wing member 10 created in FIGS. 1A to 1C so as to surround the casting 13. Moreover, although the casting 13 is used in FIG.3 and FIG.4, you may use the metal member obtained by sheet-metal processing.
In the wing member 20 including the wing member 10 configured as described above, a flow path of air (fluid) via the hole 5 can be formed as shown by arrows in FIGS. 3 and 4. Effects such as enhancing the cooling efficiency by the cooling air can be obtained.

以上詳細に説明したように本実施形態に示される流体機械羽根１００の製造方法によれば、流体機械の翼部材１０・２０の全部又は一部となる平面状の板状部材１に穴２〜５を形成した後で、該板状部材１を羽根形状となるように曲げ加工するようにしたので、三次元的に湾曲した平面を有する翼本体の表面又は内部への穴加工を容易に行うことができ、かつ鋳造や機械加工の精度に影響されない複雑な穴加工が可能となる。   As described above in detail, according to the method for manufacturing the fluid machine blade 100 shown in the present embodiment, the flat plate-like member 1 that is all or part of the blade member 10 or 20 of the fluid machine has the holes 2 to 2. After forming 5, the plate-like member 1 is bent so as to have a blade shape, so that the hole processing on the surface or inside of the blade body having a three-dimensionally curved plane can be easily performed. It is possible to perform complicated drilling that is not affected by the accuracy of casting and machining.

また、上記流体機械羽根１００の製造方法によれば、板状部材１の高さ方向又は流体の流れ方向等に沿って穴２〜５を形成した後、板状部材１を羽根形状となるように曲げ加工して、回転軸１１のディスク１２に設置される翼部材１０・２０を形成した。そして、穴形成時に、板状部材１に形成する穴２〜５の形態（板状部材１の高さ方向又は流体の流れ方向等に沿う穴２〜５など）を選択的に形成することで、該翼部材１０・２０の冷却空気による冷却効率を高める、又は材料の使用量を減少させることによる低コスト化／軽量化を図ることができる。   Moreover, according to the manufacturing method of the fluid machine blade 100, after forming the holes 2 to 5 along the height direction of the plate-like member 1 or the fluid flow direction, the plate-like member 1 is shaped like a blade. The wing members 10 and 20 installed on the disk 12 of the rotary shaft 11 were formed. And at the time of hole formation, by selectively forming the form of holes 2 to 5 formed in the plate-like member 1 (holes 2 to 5 along the height direction of the plate-like member 1 or the fluid flow direction, etc.). Thus, the cooling efficiency of the blade members 10 and 20 by the cooling air can be increased, or the cost and weight can be reduced by reducing the amount of material used.

（変形例）
上記流体機械羽根１００の製造方法では、曲げ加工前で穴２〜５を形成した工程の後に、曲げ加工時に穴２〜５が変形して、穴形状が小さくなったり（本来真円とすべき穴が扁平状になるような変形を含む）、あるいは、閉塞することを防止すべく、曲げ加工前に以下の（１）〜（４）に示す処理を実行しても良い。なお、これら(１)〜（４）の処理は、択一的に、あるいは、その後の加工条件（温度、塑性加工の変形量等）に応じて複数の処理を組み合わせても良い。 (Modification)
In the manufacturing method of the fluid machine blade 100, after the step of forming the holes 2 to 5 before the bending process, the holes 2 to 5 are deformed at the time of the bending process, and the hole shape is reduced (originally it should be a perfect circle). The processing shown in the following (1) to (4) may be executed before the bending process in order to prevent the hole from being blocked or to be blocked. Note that these processes (1) to (4) may be alternatively or in combination with a plurality of processes according to subsequent processing conditions (temperature, deformation amount of plastic processing, etc.).

（１）板状部材１に穴２〜５を形成した後に、はんだ等の低融点合金を穴２〜５に埋め、曲げ加工後に加熱して除去する。
（２）板状部材１に穴２〜５を形成した後に、該穴２〜５部にフレキシブルな棒状の材料を挿入した状態で曲げ加工し、その後、棒状の部材を抜き取る。この変形例の場合、前記棒状の部材として、例えば板状部材よりヤング率が高い等、曲げ加工によって塑性変形し難い材料からなる所定の断面形状（形成すべき穴と同じ断面形状）の線状体を用いれば、板状部材１の曲げ加工による穴２〜５の変形を防止することができる。
（３）板状部材１に穴２〜５を形成した後に、粉体状の材料で穴２〜５を埋め、穴の両端に栓をして、あるいは溶接等で両端を閉じて内部に封止し、曲げ加工後に前記栓を除去して封止を除去する。
（４）板状部材１に穴２〜５を形成した後に、水、油、液体金属等の非圧縮性流体を穴２〜５に入れ、穴２〜５の穴の両端に栓をして、あるいは溶接等で両端を閉じて封止し、曲げ加工後、前記封止を解除して流体を抜く。 (1) After forming the holes 2 to 5 in the plate-like member 1, a low melting point alloy such as solder is buried in the holes 2 to 5 and heated and removed after bending.
(2) After forming the holes 2 to 5 in the plate-shaped member 1, bending is performed in a state where a flexible rod-shaped material is inserted into the holes 2 to 5, and then the rod-shaped member is extracted. In the case of this modification, the rod-like member has a linear shape with a predetermined cross-sectional shape (the same cross-sectional shape as the hole to be formed) made of a material that is difficult to be plastically deformed by bending, such as a higher Young's modulus than a plate-like member. If a body is used, the deformation | transformation of the holes 2-5 by the bending process of the plate-shaped member 1 can be prevented.
(3) After the holes 2 to 5 are formed in the plate-like member 1, the holes 2 to 5 are filled with a powdered material, and both ends of the hole are plugged, or both ends are closed by welding or the like and sealed inside. Stop and remove the plug after bending to remove the seal.
(4) After forming holes 2 to 5 in the plate-like member 1, put an incompressible fluid such as water, oil, or liquid metal into the holes 2 to 5 and plug the ends of the holes 2 to 5. Alternatively, both ends are closed and sealed by welding or the like, and after bending, the sealing is released and the fluid is drained.

そして、このような（１）〜（４）を追加した流体機械羽根１００の製造方法によれば、穴形成後にその穴２〜５の内部にフレキシブルな材料等からなる充填物を詰めるようにしたので、その後の板状部材１を羽根形状となるように曲げ加工する工程において、該充填物によって穴２〜５が塞がることを防止でき、羽根形状を有する板状部材１に確実に穴を形成することができる。   And according to the manufacturing method of the fluid machine blade | wing 100 which added such (1)-(4), it was made to stuff the filling which consists of a flexible material etc. in the inside of the holes 2-5 after hole formation. Therefore, it is possible to prevent the holes 2 to 5 from being blocked by the filler in the step of bending the plate-like member 1 so as to have a blade shape, and to reliably form the hole in the plate-like member 1 having the blade shape. can do.

以上、本発明の実施形態について図面を参照して詳述したが、具体的な構成はこの実施形態に限られるものではなく、本発明の要旨を逸脱しない範囲の設計変更等も含まれる。   As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

本発明は、遠心ポンプ、斜流ポンプ、軸流ポンプなどの流体機械の羽根に適用される技術である。   The present invention is a technique applied to blades of a fluid machine such as a centrifugal pump, a mixed flow pump, and an axial flow pump.

１ 板状部材
２ 穴
３ 穴
４ 穴
５ 穴
１０ 翼部材
１１ 回転軸
１２ ディスク
１３ 鋳物
２０ 翼部材
１００ 流体機械羽根 DESCRIPTION OF SYMBOLS 1 Plate-like member 2 Hole 3 Hole 4 Hole 5 Hole 10 Wing member 11 Rotating shaft 12 Disc 13 Casting 20 Wing member 100 Fluid machine blade

Claims (6)

流体機械の翼部材の全部又は一部となる平面状の板状部材に穴を形成する工程と、
前記板状部材を羽根形状となるように曲げ加工する工程と、を有することを特徴とする流体機械羽根の製造方法。 Forming a hole in a planar plate-like member that is all or part of a wing member of a fluid machine;
And a step of bending the plate-like member into a blade shape. 前記板状部材を羽根形状となるように曲げ加工することにより、回転軸のディスクに設置される翼部材となることを特徴とする請求項１に記載の流体機械羽根の製造方法。   2. The method of manufacturing a fluid machine blade according to claim 1, wherein the plate-shaped member is bent so as to have a blade shape to become a blade member installed on a disk of a rotating shaft. 前記穴は、前記翼部材の高さ方向に沿って形成されることを特徴とする請求項２に記載の流体機械羽根の製造方法。   The said hole is formed along the height direction of the said wing | blade member, The manufacturing method of the fluid machine blade | wing of Claim 2 characterized by the above-mentioned. 前記穴は、前記翼部材の流体の流れ方向に沿って形成されることを特徴とする請求項２に記載の流体機械羽根の製造方法。   The method of manufacturing a fluid machine blade according to claim 2, wherein the hole is formed along a fluid flow direction of the blade member. 前記曲げ加工の前に前記穴の内部に粉体、液体、または固体の充填物を詰めることを特徴とする請求項１〜４のいずれか１項に記載の流体機械羽根の製造方法。   5. The method of manufacturing a fluid machine blade according to claim 1, wherein a powder, liquid, or solid filler is filled in the hole before the bending process. 前記充填物はフレキシブルな線状材料であることを特徴とする請求項５に記載の流体機械羽根の製造方法。   The method for manufacturing a fluid machine blade according to claim 5, wherein the filler is a flexible linear material.
JP2011035608A 2011-02-22 2011-02-22 Method of manufacturing fluid machine blade Pending JP2012172596A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05306698A (en) * 1992-04-30 1993-11-19 Kubota Corp Cavitation reduction system of impeller pressure surface
JPH08300052A (en) * 1995-04-28 1996-11-19 Showa Alum Corp Bending method of hollow material, hollow material and both end cap device of hollow material
US20110027097A1 (en) * 2008-03-25 2011-02-03 Snecma Method for manufacturing a hollow blade

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05306698A (en) * 1992-04-30 1993-11-19 Kubota Corp Cavitation reduction system of impeller pressure surface
JPH08300052A (en) * 1995-04-28 1996-11-19 Showa Alum Corp Bending method of hollow material, hollow material and both end cap device of hollow material
US20110027097A1 (en) * 2008-03-25 2011-02-03 Snecma Method for manufacturing a hollow blade

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