JPS61245922A - Bellows forming method - Google Patents
Bellows forming methodInfo
- Publication number
- JPS61245922A JPS61245922A JP60086148A JP8614885A JPS61245922A JP S61245922 A JPS61245922 A JP S61245922A JP 60086148 A JP60086148 A JP 60086148A JP 8614885 A JP8614885 A JP 8614885A JP S61245922 A JPS61245922 A JP S61245922A
- Authority
- JP
- Japan
- Prior art keywords
- bellows
- forming
- thickness
- crest
- root
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ベローズの成形方法に係り、特に山と谷がＵ
型に成形されるＵ型成形ベローズの成形方法に係るもの
である。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for forming bellows, and in particular, the present invention relates to a method for forming bellows, in particular when the peaks and valleys are
The present invention relates to a method for forming a U-shaped bellows that is formed into a mold.
化学プラント或いは原子カプラント等に用いられる配管
系には、ベローズ伸縮継手が用いられている。例えば、
原子カプラントの高速増殖炉（以下ＦＢＲを略称する）
に於て、１次冷却材の輸送に用いられる配管の温度は、
冷却材の温度が５００℃に達することから、該冷却材温
度にほぼ近い高温となる。そのため、配管の熱膨張によ
り熱応力の増大をまねき、且つ材料の許容応力値も低下
するので、配管系が破損する危険が生じる。Bellows expansion joints are used in piping systems used in chemical plants, atomic couplants, and the like. for example,
Nuclear couplant fast breeder reactor (hereinafter abbreviated as FBR)
In this case, the temperature of the piping used to transport the primary coolant is
Since the temperature of the coolant reaches 500° C., the temperature is almost close to the coolant temperature. Therefore, the thermal expansion of the piping causes an increase in thermal stress, and the allowable stress value of the material also decreases, so there is a risk that the piping system will be damaged.
そこで、熱応力を緩和すべく？！ｉ雑な配管引廻しが必
要となってくるので、配管長が増大し、ひいてはプラン
ト建設費の増大を来たす要因となる。So, what about alleviating thermal stress? ! Since complicated piping routing becomes necessary, the length of the piping increases, which in turn causes an increase in plant construction costs.
このようなプラント建設費の増大を改善するために、配
管系の所定の位置に膨張−収縮継手を設けて熱膨張を吸
収し、配管系をコンパクト化する試みがあるが、原子カ
プラントでは内部流体漏洩に対するバウンダリーを形成
する必要があるので、該膨張−収縮継手は完全な気密性
能を保つことが可能なベローズ継手を用いている。In order to alleviate this increase in plant construction costs, attempts have been made to provide expansion-contraction joints at predetermined positions in the piping system to absorb thermal expansion and make the piping system more compact. Since it is necessary to form a boundary against leakage, the expansion-deflation joint uses a bellows joint that can maintain perfect airtight performance.
しかしながら、化学プラントや原子力プラントでは、万
一ベローズ部が破損すると、配管系の破損にとどまらず
プラント全体の安全性が損なわれることになり、特に毒
性或いは引火性の強い流体を取扱うプラント、或いは原
子カプラントではその影響は大きい。例えば、ＦＢＲで
は冷却材に液体金属ナトリウムを用いているため、一旦
バウンダリーが破損し、ナトリウムの外部流出事故が起
こると、空気中の酸素により激しい酸化反応が起こり、
火災発生の原因となる。従って、このような原子カプラ
ントに用いられる・ベローズ継手は、製作中の品質管理
は勿゛論、製作法に於ても、充分な試験検査が必要であ
り、特に溶接部の検査は非破壊検査が要求される。更に
この非破壊検査は体積検査が必要であるが、超音波探傷
試験はＦＢＨに用いられるステンレス鋼、ニッケル合金
鋼には適用出来ないことから、放射線検査を行うことが
必要である。そのため放射線検査の不可能な溶接ベロー
ズは使用出来ないので、通常山と谷がＵ型に成形された
Ｕ型成形ベローズが用いられている。However, in chemical plants and nuclear power plants, if the bellows part were to break, it would not only damage the piping system but also impair the safety of the entire plant. At Kaplant, the influence is significant. For example, since FBR uses liquid metal sodium as a coolant, once the boundary is damaged and sodium leaks outside, a violent oxidation reaction will occur due to oxygen in the air.
It may cause a fire. Therefore, the bellows joints used in such atomic couplants require sufficient testing and inspection not only for quality control during manufacturing but also for the manufacturing method.In particular, inspection of welded parts requires non-destructive testing. is required. Furthermore, this non-destructive inspection requires volumetric inspection, but since ultrasonic flaw detection cannot be applied to stainless steel and nickel alloy steel used for FBH, it is necessary to perform radiographic inspection. Therefore, a welded bellows that cannot be inspected by radiation cannot be used, so a U-shaped bellows with U-shaped peaks and valleys is usually used.
しかしながら、従来のＵ型成形ベローズは、肉厚一定の
シームレスパイプを成形金型にセントして内面に圧力を
かけることにより成形するため、ベローズの山、谷の頂
部近傍は減肉し、またこの山、谷の頂部は内圧による応
力集中個所であるため、高い応力が発生する。この減肉
分を考慮し、ベローズ全体の板厚を増すことはベローズ
の剛性が増加し、本来の目的である熱膨張−収縮の吸収
性が悪くなり、変位による応力を低減するためにはベロ
ーズの山数や山高が大きくなり、ベローズが大型化する
ことになる。However, conventional U-shaped molded bellows are molded by inserting a seamless pipe with a constant wall thickness into a molding die and applying pressure to the inner surface. High stress occurs at the tops of mountains and valleys because they are stress concentration points due to internal pressure. Considering this thinning, increasing the overall thickness of the bellows increases the rigidity of the bellows, which deteriorates its ability to absorb thermal expansion and contraction, which is the original purpose. The number and height of the ridges will increase, and the bellows will become larger.
本発明は上記の技術的な問題点を解決すべくなされたも
ので、成形時ベローズの山、谷の頂部の減肉を防止する
ベローズ成形方法を提供することを目的とするものであ
る。The present invention has been made to solve the above-mentioned technical problems, and an object of the present invention is to provide a bellows molding method that prevents thinning at the tops of the peaks and valleys of the bellows during molding.
上記問題点を解決するための本発明は、ベローズ成形用
材料をシームレス円筒体に成形すると共に、山及び谷を
成形する部分をこれら山と谷部とを接続するベローズの
中心線に垂直な壁面を成形する部分よりも厚肉に成形し
、然る後このシームレス円筒体をベローズ成形金型にセ
ットし、内面に圧力をかけて成形することを特徴とする
ベローズの成形方法である。In order to solve the above problems, the present invention molds a material for forming a bellows into a seamless cylindrical body, and at the same time, the parts for forming the peaks and valleys are formed on the wall surface perpendicular to the center line of the bellows connecting these peaks and valleys. This is a bellows molding method characterized by molding the seamless cylindrical body to be thicker than the part to be molded, then setting this seamless cylindrical body in a bellows mold, and molding by applying pressure to the inner surface.
本発明によるベローズの成形方法の一実施例を詳細に説
明する。第１図に於て、１はＵ型成形ベローズを成形す
るための材料で、この材料ｌは円筒状に成形してシーム
レス管となすと共に、該シームレス管の板厚を板厚１．
で長さ！。An embodiment of the bellows forming method according to the present invention will be described in detail. In Fig. 1, 1 is a material for forming a U-shaped bellows, and this material 1 is formed into a cylindrical shape to form a seamless tube, and the thickness of the seamless tube is 1.
And the length! .
のＡ部と板厚ｔ！で長さｌ！のＢ部とが交互にくるよう
に変化させて成形したものである。即ち、このシームレ
ス管の板厚は１．＞１．になるように成形したものであ
る。然してこのシームレス管は肉厚の厚いＡ部が山及び
谷となるよう成形してベローズを作る。即ち、第２図に
於て肉厚の厚いＡ部の外側に山及び谷用成形金型２．３
を交互に配設して高い内圧をかけてその圧力により成形
して第３図に示す如くベローズ４を作る。かくして成形
時最も減肉する山、谷部の減肉がなくなり、一様に一定
肉厚のベローズ４が得られる。Part A and plate thickness t! And the length is l! It is molded so that the parts B and B are arranged alternately. That is, the thickness of this seamless pipe is 1. >1. It is molded to look like this. However, this seamless pipe is formed so that the thick walled portion A forms peaks and valleys to form a bellows. That is, in Fig. 2, a mold 2.3 for forming peaks and valleys is placed on the outside of the thick section A.
The bellows 4 are formed by arranging them alternately and applying high internal pressure to form the bellows 4 as shown in FIG. In this way, there is no thinning at the peaks and troughs, which are the most likely to be thinned during molding, and a bellows 4 having a uniformly constant wall thickness can be obtained.
尚、ベローズ成形用材料１は材質、サイズ等によってそ
の形状も変えることも出来る。その例を第４図に示す。Note that the shape of the bellows molding material 1 can also be changed depending on the material, size, etc. An example is shown in FIG.
図中板厚１．のＡ、は谷部、同じく板厚１．のＡ、は山
部を成形する部分であり、板厚１．のＢはベローズの中
心線に垂直な壁面を成形する部分である。Plate thickness in the figure: 1. , A is the valley, and the plate thickness is 1. A is the part where the peak is formed, and the plate thickness is 1. B is the part that forms the wall surface perpendicular to the center line of the bellows.
以上のように成形したベローズの作用について説明する
と、一般にＵ型成形ベローズは、成形時に加工率の大き
な山部及び谷部が最も肉厚が減少するが、本実施例のよ
うにベローズに成形加工前の成形用材料１に、山及び谷
部を成形するＡ部を他のＢ部に比して厚肉に成形するの
で、ベローズに成形後の厚肉がベローズ全体にわたって
一様となる。従って、プラント運転中に於るベローズは
、山及び谷の頂部での内圧による応力が軽減される。To explain the function of the bellows formed as described above, in general, in a U-shaped formed bellows, the wall thickness decreases the most at the peaks and valleys where the processing rate is large during forming, but as in this example, the bellows is formed In the previous molding material 1, the A part where the peaks and valleys are formed is formed to be thicker than the other B part, so that the thickness after being formed into the bellows is uniform over the entire bellows. Therefore, during plant operation, the bellows is less stressed by internal pressure at the tops of the peaks and valleys.
以上詳述した通り本発明のベローズ成形方法、ベローズ
成形用材料をシームレス円筒体に成形すると共に減肉の
一番はげしい出及び谷を成形する部分を他を成形する部
分よりも厚肉に成形し、然る後このシームレス円筒体を
ベローズ成形金型にセットし内圧をかけて成形している
ので、全体にわたって一様の一定の肉厚となるのでプラ
ント運転中白及び谷の頂部での内圧による応力集中を軽
減できるベローズを得ることができるという効果がある
。As detailed above, in the bellows molding method of the present invention, the bellows molding material is molded into a seamless cylindrical body, and the parts where the protrusions and valleys where the thinning is the most severe are molded to be thicker than the parts where the other parts are molded. Then, this seamless cylindrical body is set in a bellows mold and molded by applying internal pressure, so that it has a uniform and constant wall thickness throughout, so during plant operation, the internal pressure at the top of the white and valley This has the effect of providing a bellows that can reduce stress concentration.
第１図は本発明のベローズ成形方法の前半の工程で成形
されたベローズ成形材料を示す断面図、第２図はそのベ
ローズ成形材料をベローズに成形する際の山、谷部と成
形金型との関係を示す断面図、第３図は本発明の成形方
法により成形されたベローズの断面図、第４図は、ベロ
ーズ成形方法の前半の工程で成形されたベローズ成形材
料の他の例を示す断面図である。
１−−一−ベローズ成形用材料 ２−一一一 谷部成形
金型３−−ｍ＝ 山部成形金型 ４−一一一 ベ
ローズ出願人 川崎重工業株式会社
第１図
第２図
第３図
第４図Figure 1 is a cross-sectional view showing the bellows molding material molded in the first half of the bellows molding method of the present invention, and Figure 2 shows the peaks, valleys, and molding die when molding the bellows molding material into bellows. Figure 3 is a cross-sectional view of a bellows molded by the molding method of the present invention, and Figure 4 shows another example of a bellows molding material molded in the first half of the bellows molding method. FIG. 1--1-Bellows molding material 2-111 Valley molding mold 3--m= Peak molding mold 4-111 Bellows applicant Kawasaki Heavy Industries, Ltd. Figure 1 Figure 2 Figure 3 Figure 4
Claims (1)
に、山及び谷部を成形する部分をこれら山と谷部とを接
続するベローズの中心線と垂直な壁面を成形する部分よ
りも厚肉に成形し、然る後このシームレス円筒体をベロ
ーズ成形金型にセットし、内面に圧力をかけて成形する
ことを特徴とするベローズ成形方法。The material for forming the bellows is molded into a seamless cylindrical body, and the part where the peaks and valleys are formed is thicker than the part where the wall surface perpendicular to the center line of the bellows connecting these peaks and valleys is formed. A bellows molding method, which is characterized in that the seamless cylindrical body is then set in a bellows mold and molded by applying pressure to the inner surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60086148A JPS61245922A (en) | 1985-04-22 | 1985-04-22 | Bellows forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60086148A JPS61245922A (en) | 1985-04-22 | 1985-04-22 | Bellows forming method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61245922A true JPS61245922A (en) | 1986-11-01 |
Family
ID=13878651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60086148A Pending JPS61245922A (en) | 1985-04-22 | 1985-04-22 | Bellows forming method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61245922A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003028914A1 (en) * | 2001-09-26 | 2003-04-10 | Honda Giken Kogyo Kabushiki Kaisha | Method of manufacturing hollow member |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5540046A (en) * | 1978-09-14 | 1980-03-21 | Toshiba Corp | Hydrostatic bulge forming method of shell |
-
1985
- 1985-04-22 JP JP60086148A patent/JPS61245922A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5540046A (en) * | 1978-09-14 | 1980-03-21 | Toshiba Corp | Hydrostatic bulge forming method of shell |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003028914A1 (en) * | 2001-09-26 | 2003-04-10 | Honda Giken Kogyo Kabushiki Kaisha | Method of manufacturing hollow member |
| US7175799B2 (en) | 2001-09-26 | 2007-02-13 | Honda Giken Kogyo Kabushiki Kaisha | Process for producing hollow member |
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