JPH0234719A - Manufacture of bellows for valve of vacuum circuit breaker - Google Patents
Manufacture of bellows for valve of vacuum circuit breakerInfo
- Publication number
- JPH0234719A JPH0234719A JP18250688A JP18250688A JPH0234719A JP H0234719 A JPH0234719 A JP H0234719A JP 18250688 A JP18250688 A JP 18250688A JP 18250688 A JP18250688 A JP 18250688A JP H0234719 A JPH0234719 A JP H0234719A
- Authority
- JP
- Japan
- Prior art keywords
- bellows
- vacuum
- annealing
- circuit breaker
- stainless steel
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 238000000137 annealing Methods 0.000 claims abstract description 19
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 16
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 15
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims abstract description 7
- 239000011261 inert gas Substances 0.000 claims abstract description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 13
- 239000010936 titanium Substances 0.000 claims description 13
- 239000010955 niobium Substances 0.000 claims description 12
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 150000004767 nitrides Chemical class 0.000 abstract description 5
- 229910052786 argon Inorganic materials 0.000 abstract description 3
- 230000003746 surface roughness Effects 0.000 abstract 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 230000008602 contraction Effects 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- -1 argon Chemical compound 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 210000002784 stomach Anatomy 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
- H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Diaphragms And Bellows (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は真空遮断器の真空バルブに使用するベローズの
製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a bellows used in a vacuum valve of a vacuum circuit breaker.
真空遮断器は真空バルブ中で固定接触子と可動接触子と
が接離して、この真空遮断器に接続された電気回路を開
閉または遮断するもので、真空バルブは第１図に示すよ
うに絶縁筒１の上下開口部にフランジ２．３が密着して
設けられ、上部フランジ２には周面にひだを有する円筒
状のベローズ４の一端が取付けられ、絶縁筒１内に延び
たベローズ４の他端にはベローズ４を貫通した可動通電
棒５の先端に固定された可動接触子６が真空プレート７
を介して取付けられている。下部フランジ３には固定通
電棒８が取付けられ、この固定通電棒８の先端には可動
接触子６に対向する固定接触子９が取付けられている。A vacuum circuit breaker is a vacuum valve in which a fixed contact and a movable contact connect and separate to open/close or cut off the electrical circuit connected to the vacuum circuit breaker.The vacuum valve is insulated as shown in Figure 1. Flanges 2 . At the other end, a movable contact 6 fixed to the tip of a movable current-carrying rod 5 passing through the bellows 4 is connected to a vacuum plate 7.
It is installed through. A fixed energizing rod 8 is attached to the lower flange 3, and a fixed contact 9 facing the movable contact 6 is attached to the tip of the fixed energizing rod 8.
そして絶縁筒１内は外えられる外力でベローズ４を伸縮
させて上下に移動し固定接触子９と接離する。このため
ベローズ４は周囲の構成材料と気密接合ができ、内部の
真空を低下させることなく可動接触子６と固定接触子９
に接離させるのに十分な伸縮性を有していること、真空
バルブ内の真空を長期に確実に保つため耐食性に優れ、
さらに真空バルブの製造工程において過酷な熱履歴を受
けるから耐熱性に優れているなどの条件が要求される。Then, inside the insulating cylinder 1, the bellows 4 is expanded and contracted by the external force that is removed, and moves up and down to come into contact with and separate from the fixed contact 9. Therefore, the bellows 4 can be airtightly connected to the surrounding constituent materials, and the movable contact 6 and the fixed contact 9 can be connected to each other without lowering the internal vacuum.
It has sufficient elasticity to bring it into contact with and separate from it, and it has excellent corrosion resistance to ensure that the vacuum inside the vacuum valve is maintained for a long time.
Furthermore, since the vacuum valve is subjected to severe thermal history in the manufacturing process, conditions such as excellent heat resistance are required.
これらの条件を満たす材料として一最にはチタンまたは
ニオブを添加したオーステナイト系ステンレス鋼の薄板
が用いられている。すでに述べたようにベローズは十分
な伸縮性を得るために周面に山と谷とからなるひだを形
成することが必要であり、例えばステンレス鋼の薄いチ
ューブを製作し、このチューブから金型や液圧によって
成形する。このためには特にそのために製造された板厚
０．４〜０．６鶴のステンレス鋼を用い、プレス抜き、
絞りをして、さらに絞り一洗浄−焼鈍−酸洗の工程を数
回から１０数回繰返して板厚０．１鰭程度のチューブが
形成され、このチューブにひだが形成される。The most commonly used material that satisfies these conditions is a thin plate of austenitic stainless steel to which titanium or niobium is added. As mentioned above, in order to obtain sufficient elasticity of bellows, it is necessary to form folds consisting of peaks and valleys on the circumferential surface. Formed using hydraulic pressure. For this purpose, we used stainless steel with a thickness of 0.4 to 0.6 mm, which was manufactured especially for this purpose, and press-pull it.
After drawing, the process of drawing, cleaning, annealing, and pickling is repeated several to ten times to form a tube with a plate thickness of approximately 0.1 fin, and pleats are formed in this tube.
Ｃ発明が解決しようとする課題〕
上述の各製造工程での焼鈍は作業性やコストの点から従
来アンモニヤを分解したガス雰囲気中で実施されること
が多い、ところで上述のステンレス鋼は加工中何回も焼
鈍するために加熱されるのでカーボンを減らす必要から
チタンやニオブが添加されているのが通例であり、これ
をアンモニヤ分解ガス雰囲気中で焼鈍するとこのチタン
やニオブがガス雰囲気中の窒素と結合し窒化層が形成さ
れるという問題がある。ベローズの製造工程中焼鈍を繰
返すのは勿論、圧延や絞りによって硬化したステンレス
鋼を軟化させ、再び圧延や絞りを施して次第に所望の形
に成形するためであるが、焼鈍をするごとにこの窒化層
は拡大し、かつ圧延や絞りを行うとその分だけ窒化層の
比率は増加する。Problems to be solved by the invention C] From the viewpoint of workability and cost, annealing in each of the above-mentioned manufacturing processes is conventionally often carried out in a gas atmosphere in which ammonia is decomposed. Since it is heated for annealing, titanium and niobium are usually added to reduce carbon. There is a problem of bonding and formation of a nitride layer. Of course, during the manufacturing process of bellows, annealing is repeated to soften the stainless steel that has been hardened by rolling and drawing, and then to gradually form it into the desired shape by rolling and drawing again. The layer expands, and when rolling or drawing is performed, the ratio of the nitrided layer increases accordingly.
この窒化層はかたくてもろいから加工上問題になるだけ
でなく、表面に肌荒れや亀裂を生じ、完成したベローズ
の伸縮性を悪くし、その寿命を短くし、ひいては真空バ
ルブの寿命を短くする原因となる。This nitrided layer is hard and brittle, which not only causes processing problems, but also causes roughness and cracks on the surface, which impairs the elasticity of the finished bellows and shortens its lifespan, which in turn shortens the lifespan of the vacuum valve. becomes.
本発明の目的は、チタンやニオブを含むステンレス鋼板
を成形したときに成形部に肌荒れや亀裂を発生せず、ベ
ローズとして伸縮したときも亀裂の発生しない長寿命の
真空遮断器バルブ用ベローズの製造方法を提供すること
にある。The purpose of the present invention is to manufacture a bellows for a vacuum circuit breaker valve that has a long life and does not cause roughness or cracks in the formed part when a stainless steel plate containing titanium or niobium is formed, and does not cause cracks when expanded and contracted as a bellows. The purpose is to provide a method.
上述の課題を解決するため本発明は、チタンまたはニオ
ブを添加したオーステナイト系ステンレス鋼を不活性ガ
ス雰囲気中で焼鈍する工程を含むもので、この焼鈍は真
空中で行ってもよい。In order to solve the above problems, the present invention includes a step of annealing austenitic stainless steel to which titanium or niobium is added in an inert gas atmosphere, and this annealing may be performed in a vacuum.
チタンやニオブは窒化し易く、かつ窒化するとかたくて
もろくなるから、チタンやニオブを含有するステンレス
鋼を焼鈍する場合、チタンやニオブに対しアルゴンのよ
うな不活性ガスの雰囲気中または真空中で焼鈍すると窒
化層が生成されない。Titanium and niobium are easily nitrided, and when nitrided, they become hard and brittle. Therefore, when annealing stainless steel containing titanium or niobium, annealing in an atmosphere of an inert gas such as argon or in a vacuum is recommended for titanium and niobium. Then, no nitride layer is generated.
（実施例）
本実施例は従来例と比較するために、ベローズは板厚０
．４ｍのチタンを含むオーステナイト系ステンレス鋼板
を真空中で焼鈍して製造したのち円形に抜き、この円板
を絞り一真空中焼純→酸洗の工程を繰返して厚さ０．１
ｍのチューブを製作し、ざらに液圧によって自由長８
４０鶴、外径＝３５ｆｉ、山１ａ ： １０のベローズ
に成形した。これを従来のベローズと比較するためアン
モニヤ分解ガス中で光輝焼鈍した実施例と同じ成分厚さ
のステンレス鋼板を円形に抜き、焼鈍雰囲気だけをアン
モニヤ分解ガスとしその他は実施例と同じ工程でチュー
ブを製作したのち液圧によって実施例と同じ形状に成形
した。(Example) In this example, in order to compare with the conventional example, the bellows has a plate thickness of 0.
．． A 4 m long austenitic stainless steel plate containing titanium is manufactured by annealing it in a vacuum, then punched out into a circular shape.The process of drawing this disk, annealing it in a vacuum, and then pickling it is repeated to obtain a thickness of 0.1 m.
A tube with a length of 8 m is made, and the free length is 8
It was molded into a bellows with 40 cranes, outer diameter = 35fi, and ridges 1a: 10. In order to compare this with a conventional bellows, a stainless steel plate brightly annealed in ammonia decomposition gas and having the same component thickness as the example was cut out in a circular shape, and a tube was made using the same process as in the example, except that the annealing atmosphere was ammonia decomposition gas. After manufacturing, it was molded into the same shape as the example using hydraulic pressure.
この両ベローズは次のようにして伸縮寿命試験を行った
。すなわち両ベローズのｖＲ端をそれぞれ圧とし、内圧
をチエツクしながら可動側板を往復動させることによっ
てベローズに所定の伸縮を付与し、内圧が低下した時点
をベローズの寿命とした。第１表は従来品と実施例との
それぞれ５例に対する伸縮寿命試験の回数（Ｘ万国）で
あり、胃は平均値、ｍ１ｒｌはこれら５例中の最短寿命
である。Both bellows were subjected to an expansion/contraction life test as follows. That is, the vR end of both bellows was set as the pressure, and the bellows was given a predetermined expansion and contraction by reciprocating the movable side plate while checking the internal pressure, and the time when the internal pressure decreased was defined as the life of the bellows. Table 1 shows the number of expansion and contraction life tests (X countries) for 5 cases each of the conventional product and the example, where the stomach is the average value and m1rl is the shortest life among these 5 cases.
第１表
第１表から知られるように従来品に比し実施例は、平均
値で約１．２倍、最低値では約１．５倍伸縮回数が多い
１次に比較的寿命の短いベローズについて、その表面と
断面を詳細にミクロ観察したところ、実施例については
特に問題となる点は見出せなかったが、従来品について
は微細な窒化物が切欠きとなっていることが明らかとな
つた。さらにチューブからベローズを成形する際に従来
品は約３５％の割合で亀裂が発生し、使用不能であった
が、実施例では亀裂を発生することがなり１００％完成
した。Table 1 As is known from Table 1, compared to the conventional product, the embodiment has a bellows with a relatively short life in the primary, which has a higher number of expansions and contractions, about 1.2 times the average value, and about 1.5 times the lowest value. A detailed microscopic observation of the surface and cross section of the sample revealed that, while no particular problem was found in the example, it was revealed that the conventional product had fine nitrides forming notches. . Furthermore, when forming a bellows from a tube, cracks occurred at a rate of about 35% in the conventional product, making it unusable, but in the example, cracks did not occur and the product was 100% completed.
本発明による真空遮断器バルブ用ベローズの製造方法に
より製造されたベローズはその材料がアルゴンのような
チタンやニオブに対し不活性ガスまたは真空中で焼鈍さ
れ、従来品のように窒化物が生成しないから伸縮寿命が
長く、真空バルブとして最も弱かった部分を補強するこ
とになり、ますます長寿命化が要求される真空遮断器用
真空バルブに良好に適用できる。またベローズ成形時の
不良品の発生が低減できるので、焼鈍設備に多少の経費
が増加しても従来品より安価に製造できるという効果が
ある。さらに本発明の内容はチタンやニオブを添加した
ステンレス鋼の焼鈍だけでなく、広くチタンやニオブを
含む合金の熱処理方法を示唆するものである。The bellows manufactured by the method for manufacturing bellows for vacuum circuit breaker valves according to the present invention is annealed in an inert gas or vacuum against titanium or niobium such as argon, so that nitrides are not generated unlike conventional products. Since it has a long expansion and contraction life, it strengthens the weakest part of the vacuum valve, making it suitable for vacuum valves for vacuum circuit breakers, which require increasingly longer lifespans. Furthermore, since the occurrence of defective products during bellows molding can be reduced, there is an effect that the product can be manufactured at a lower cost than conventional products even if the cost of annealing equipment increases to some extent. Furthermore, the content of the present invention suggests not only a method for annealing stainless steel to which titanium or niobium is added, but also a heat treatment method for a wide range of alloys containing titanium or niobium.
第１図は真空遮断器用真空バルブの一例を示す断面図で
ある。
４：ベローズ。FIG. 1 is a sectional view showing an example of a vacuum valve for a vacuum circuit breaker. 4: Bellows.
Claims (1)
テンレス鋼を不活性ガス雰囲気中で焼鈍する工程を含む
ことを特徴とする真空遮断器バルブ用ベローズの製造方
法。 ２）チタンまたはニオブを添加したオーステナイト系ス
テンレス鋼を真空中で焼鈍する工程を含むことを特徴と
する真空遮断器バルブ用ベローズの製造方法。[Scope of Claims] 1) A method for manufacturing a bellows for a vacuum circuit breaker valve, which includes the step of annealing austenitic stainless steel added with titanium or niobium in an inert gas atmosphere. 2) A method for manufacturing a bellows for a vacuum circuit breaker valve, which comprises the step of annealing austenitic stainless steel added with titanium or niobium in a vacuum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18250688A JPH0234719A (en) | 1988-07-21 | 1988-07-21 | Manufacture of bellows for valve of vacuum circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18250688A JPH0234719A (en) | 1988-07-21 | 1988-07-21 | Manufacture of bellows for valve of vacuum circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0234719A true JPH0234719A (en) | 1990-02-05 |
Family
ID=16119490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18250688A Pending JPH0234719A (en) | 1988-07-21 | 1988-07-21 | Manufacture of bellows for valve of vacuum circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0234719A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1325784B2 (en) † | 2002-01-08 | 2010-10-27 | NHK SPRING Co., Ltd. | Method of making a metallic bellows |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57114609A (en) * | 1980-08-22 | 1982-07-16 | Air Prod & Chem | Control type annealing method of chromium containing ferrous metal |
| JPS5926646A (en) * | 1982-08-03 | 1984-02-10 | Isuzu Motors Ltd | Display device for automatic transmission control system |
-
1988
- 1988-07-21 JP JP18250688A patent/JPH0234719A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57114609A (en) * | 1980-08-22 | 1982-07-16 | Air Prod & Chem | Control type annealing method of chromium containing ferrous metal |
| JPS5926646A (en) * | 1982-08-03 | 1984-02-10 | Isuzu Motors Ltd | Display device for automatic transmission control system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1325784B2 (en) † | 2002-01-08 | 2010-10-27 | NHK SPRING Co., Ltd. | Method of making a metallic bellows |
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