JP3267476B2 - Method of forming the insertion protrusion of cast iron pipe - Google Patents
Method of forming the insertion protrusion of cast iron pipeInfo
- Publication number
- JP3267476B2 JP3267476B2 JP23795295A JP23795295A JP3267476B2 JP 3267476 B2 JP3267476 B2 JP 3267476B2 JP 23795295 A JP23795295 A JP 23795295A JP 23795295 A JP23795295 A JP 23795295A JP 3267476 B2 JP3267476 B2 JP 3267476B2
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- stopper ring
- brazing material
- groove
- iron pipe
- 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.)
- Expired - Fee Related
Links
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Joints With Sleeves (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鋳鉄管の接続部に
おける挿口の先端部外周側に接続部離脱防止用の環状の
挿口突部を形成する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a ring-shaped insertion projection for preventing the connection from coming off at the outer periphery of the front end of the insertion at the connection of a cast iron pipe.
【０００２】[0002]
【従来の技術】図３に示すように、一般的に鋳鉄管１の
接続部、とくに挿口２の外周面２ａには、鋼製またはダ
クタイル鋳鉄などの強靱鋳鉄製のストッパリング３’を
固着させることにより環状の挿口突部３を形成してい
る。鋳鉄管１の接続部における挿口相手側の受口４の内
周面には溝５が形成されてこの溝５に心出しゴム輪７を
介して周方向一つ割形状のロックリング６が嵌着されて
おり、このロックリング６と挿口突部３とが互いに係合
することにより、鋳鉄管１の接続部同士が離脱しないよ
うになっている。なお、図３における８は受口４の開口
端寄りの溝９と挿口２の外周面２ａとの間に配置された
ゴム輪である。2. Description of the Related Art As shown in FIG. 3, a stopper ring 3 'made of steel or ductile cast iron or the like is generally fixed to a connection portion of a cast iron tube 1, particularly an outer peripheral surface 2a of an insertion opening 2. By doing so, an annular insertion projection 3 is formed. A groove 5 is formed on the inner peripheral surface of the receiving port 4 on the mating side of the connection side of the cast iron tube 1, and a lock ring 6 having a circumferentially split shape is formed in the groove 5 via a centering rubber ring 7. The lock ring 6 and the insertion projection 3 are engaged with each other, so that the connection portions of the cast iron pipe 1 are not separated from each other. Reference numeral 8 in FIG. 3 denotes a rubber ring disposed between the groove 9 near the opening end of the receiving port 4 and the outer peripheral surface 2a of the insertion port 2.
【０００３】従来は、ストッパリング３’を以下のよう
にして鋳鉄管１の挿口２に一体的に固着させて挿口突部
３を形成していた。図４の（ａ）に示すように、挿口突
部３を形成するストッパリング３’は、外力を加えない
状態ではその内径が鋳鉄管１の外径よりも少し小さいし
まり嵌めとなるようにしている。また、このストッパリ
ング３’は、溝部３ｂがストッパリング３’の内周面３
ａにおける挿口先端寄り位置に形成された姿勢で配置さ
れ、この溝部３ｂにろう材からなるワイヤ１１を嵌入さ
せている。そして、ストッパリング３’の内周面３ａと
鋳鉄管１の挿口２におけるストッパリング３’を接合さ
せる箇所とにろう材用のフラックス（図示せず）が予め
塗布される。Conventionally, the stopper ring 3 'is integrally fixed to the insertion port 2 of the cast iron pipe 1 as described below to form the insertion projection 3. As shown in FIG. 4A, the stopper ring 3 ′ forming the insertion projection 3 has an inner diameter slightly smaller than the outer diameter of the cast iron pipe 1 when no external force is applied. ing. The stopper ring 3 ′ has a groove 3 b formed on the inner peripheral surface 3 of the stopper ring 3 ′.
The wire 11 made of a brazing material is fitted into the groove 3b in such a manner as to be formed at a position near the tip of the insertion opening in FIG. Then, a flux (not shown) for a brazing material is applied in advance to the inner peripheral surface 3a of the stopper ring 3 'and the portion of the insertion opening 2 of the cast iron pipe 1 where the stopper ring 3' is joined.
【０００４】次に、図４の（ｂ）に示すように、ワイヤ
１１を配設したストッパリング３’を、このストッパリ
ング３’の挿口先端側に配置される一端部３ｃを挿口奥
側に向けて押圧することにより、挿口外周面２ａに圧入
状態で外嵌させる。[0004] Next, as shown in FIG. 4 (b), the stopper ring 3 ′ on which the wire 11 is disposed is connected to one end 3 c of the stopper ring 3 ′ which is located at the front end side of the insertion opening. By pressing it toward the side, it is externally fitted in the insertion opening outer peripheral surface 2a in a press-fit state.
【０００５】この後、鋳鉄管１を加熱してストッパリン
グ３’の溝部３ｂ内のワイヤ１１を溶融させる。この場
合の加熱溶融方法としては、図５に示すように、鋳鉄管
１をその管軸心ｘが水平となる姿勢に配置して管軸心ｘ
を中心に回転させながら、鋳鉄管１の内周面側から加熱
することにより行っている。これにより、図４の（ｃ）
に示すように、ストッパリング３’と鋳鉄管１の挿口２
とをろう材１１’により接合させて挿口２の外周に挿口
突部３を形成する。Thereafter, the cast iron tube 1 is heated to melt the wire 11 in the groove 3b of the stopper ring 3 '. As a heating and melting method in this case, as shown in FIG. 5, the cast iron pipe 1 is disposed in a posture where the pipe axis x is horizontal, and the pipe axis x
Is performed by heating from the inner peripheral surface side of the cast iron pipe 1 while rotating about the center. Thereby, (c) of FIG.
As shown in the figure, the stopper ring 3 '
Are joined by a brazing material 11 ′ to form an insertion projection 3 on the outer periphery of the insertion opening 2.
【０００６】そして最後に、図４の（ｄ）に示すよう
に、挿口２の先端外周面と挿口突部３の挿口先端側部分
にかけて再度テーパ加工して先端ほど細くなるようにテ
ーパ面１２を形成する。ここで、このテーパ加工を行う
に際して、ストッパリング３’の溝部３ｂを含んだ部分
を削り取って、最終的に溝部３ｂを有しない状態でスト
ッパリング３’と挿口２とを接合させた状態として挿口
突部３を形成する。Finally, as shown in FIG. 4 (d), the outer peripheral surface of the front end of the insertion port 2 and the front end portion of the insertion projection 3 are tapered again so that the taper becomes thinner toward the front end. Surface 12 is formed. Here, when performing this taper processing, a portion including the groove 3b of the stopper ring 3 'is scraped off, and finally the stopper ring 3' and the insertion opening 2 are joined without the groove 3b. An insertion projection 3 is formed.
【０００７】この方法によれば、ストッパリング３’の
内周面３ａに溝部３ｂを形成し、この溝部３ｂにろう材
からなるワイヤ１１を配設しているため、十分な量のワ
イヤ１１を確保することができる。また、ストッパリン
グ３’と鋳鉄管１の挿口２との接合箇所が、図４の
（ｄ）に示すように、最終的にストッパリング３’の溝
部３ｂを有しない状態で接合された状態となるため、挿
口突部３と鋳鉄管１の挿口２との接合面積をより多く確
保できて、接合力を増加させることができる。According to this method, since the groove 3b is formed in the inner peripheral surface 3a of the stopper ring 3 'and the wire 11 made of brazing material is disposed in the groove 3b, a sufficient amount of the wire 11 is provided. Can be secured. Further, as shown in FIG. 4D, the joint between the stopper ring 3 'and the insertion opening 2 of the cast iron tube 1 is finally joined without the groove 3b of the stopper ring 3'. Therefore, a larger joint area between the insertion projection 3 and the insertion port 2 of the cast iron pipe 1 can be secured, and the joining force can be increased.
【０００８】なお、この後、ゴム輪８や心出しゴム輪
７，ロックリング６が予め配設された受口４内に挿口２
が挿入されるが、この際、挿口２のテーパ面１２により
ゴム輪８やロックリング６が案内されて拡径され、挿口
２の受口４内への挿入が許容される。[0008] Thereafter, the rubber ring 8, the centering rubber ring 7, and the lock ring 6 are inserted into the insertion port 4 provided in advance.
At this time, the rubber ring 8 and the lock ring 6 are guided by the tapered surface 12 of the insertion opening 2 to expand the diameter, and the insertion of the insertion opening 2 into the receiving opening 4 is allowed.
【０００９】[0009]
【発明が解決しようとする課題】ところで、金型成形し
てピーニング処理を行った鋳鉄管１の外表面粗さは０．
３mm程度である。一方、銀ろうでろう付けを行う場合の
標準的な隙間の寸法は０．０５〜０．１５mmであり、前
記鋳鉄管１の外表面粗さに比較すると小さな寸法である
ことから、鋳鉄管１の外面に形成されている凹凸部のう
ち、凸部となっている箇所ではストッパリング３’の内
面と接近しているために容易に広がるが、凹部となって
いる箇所ではストッパリング３’の内面と鋳鉄管１の外
面とが比較的離間しているために広がり難い。したがっ
て、上述のように、単に鋳鉄管１をその管軸心ｘが水平
となる姿勢に配置して管軸心ｘを中心に回転させるだけ
では、図４の（ｃ），（ｄ）に示すように、溶融したろ
う材１１’がストッパリング３’と鋳鉄管１の挿口２と
の間で良好には広がらず、挿口突部３と鋳鉄管１の挿口
２との接合面積を十分には確保できない。したがって、
このような方法により挿口突部３を形成した場合には、
挿口突部３の挿口２に対する接合力が不足して、挿口突
部３による離脱阻止力が不十分となるおそれがある。By the way, the outer surface roughness of the cast iron pipe 1 which has been subjected to a peening treatment by molding in a metal mold is equal to 0.
It is about 3 mm. On the other hand, the standard gap size when brazing with silver brazing is 0.05 to 0.15 mm, which is smaller than the outer surface roughness of the cast iron tube 1. Of the concave and convex portions formed on the outer surface of the stopper ring 3 ′, the convex portion is easily spread because it is close to the inner surface of the stopper ring 3 ′. Since the inner surface and the outer surface of the cast iron tube 1 are relatively separated from each other, they are difficult to spread. Therefore, as described above, simply arranging the cast iron pipe 1 in a posture where the pipe axis x is horizontal and rotating about the pipe axis x is shown in FIGS. 4C and 4D. Thus, the molten brazing material 11 ′ does not spread well between the stopper ring 3 ′ and the insertion port 2 of the cast iron pipe 1, and the joining area between the insertion projection 3 and the insertion port 2 of the cast iron pipe 1 is reduced. Not enough. Therefore,
When the insertion projection 3 is formed by such a method,
There is a possibility that the joining force of the insertion projection 3 to the insertion opening 2 is insufficient, and the detachment preventing force of the insertion projection 3 is insufficient.
【００１０】本発明は上記問題を解決するもので、溶融
したろう材をストッパリングと鋳鉄管の挿口との間で良
好に広げることができて、十分な接合力を得ることがで
きる鋳鉄管の挿口突部形成方法を提供することを目的と
するものである。[0010] The present invention solves the above-mentioned problems, and a molten iron filler metal can be favorably spread between a stopper ring and an insertion opening of a cast iron pipe so that a sufficient joining force can be obtained. It is an object of the present invention to provide a method for forming an insertion projection.
【００１１】[0011]
【課題を解決するための手段】上記問題を解決するため
に本発明は、最終的に鋳鉄管の挿口突部となるストッパ
リングの内周面に溝部を形成し、このストッパリングの
溝部にろう材を配設し、このろう材を配設したストッパ
リングを、鋳鉄管の挿口と受口とが接続される接続部に
おける挿口外周面に外嵌させ、ろう材配設箇所を含む部
分を加熱してろう材を溶融させることにより、ストッパ
リングと鋳鉄管の挿口とをろう付け接合させて接続部離
脱防止用の挿口突部を形成する鋳鉄管の挿口突部形成方
法であって、ろう材配設箇所を含む部分を加熱するに際
し、ろう付けによる接合箇所が溝部のろう材よりも下方
となるように鋳鉄管を傾斜させた姿勢で管軸心を中心に
回転させながら加熱して、溶融したろう材を、挿口外周
面とストッパリングの内周面との隙間における溝部より
下方の側に広げるものである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problem, the present invention is to form a groove on the inner peripheral surface of a stopper ring which finally becomes an insertion projection of a cast iron pipe, and to form a groove in the groove of the stopper ring. A brazing material is provided, and a stopper ring provided with the brazing material is externally fitted to an outer peripheral surface of the insertion port at a connection portion where the insertion port and the receiving port of the cast iron pipe are connected, and includes a brazing material disposing portion. A method for forming an insertion projection of a cast iron tube in which a stopper ring and an insertion opening of a cast iron pipe are brazed and joined to form an insertion projection for preventing a connection portion from being detached by heating a portion to melt a brazing material. When heating the portion including the brazing material disposing portion, the cast iron tube is rotated about the pipe axis in a posture in which the cast iron tube is inclined so that the joining portion by brazing is lower than the brazing material in the groove portion. While heating, the molten brazing material is It is intended to widen from the groove in the gap between the inner peripheral surface of the side of the lower.
【００１２】上記方法によれば、鋳鉄管を傾斜させた姿
勢で管軸心を中心に回転させながら加熱するので、溶融
したろう材が、挿口外周面とストッパリングの内周面と
の隙間における溝部より下方の側にその重量により流れ
て良好に広がることとなり、これにより、挿口と挿口突
部との間で十分な接合力を得ることができる。According to the above method, the cast iron pipe is heated while being rotated about the pipe axis in an inclined position, so that the molten brazing material is filled in the gap between the outer peripheral surface of the insertion opening and the inner peripheral surface of the stopper ring. Owing to its weight, it spreads favorably on the lower side of the groove portion, thereby making it possible to obtain a sufficient joining force between the insertion opening and the insertion projection.
【００１３】[0013]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。なお、従来と同機能のものには同
符号を付す。Embodiments of the present invention will be described below with reference to the drawings. The components having the same functions as those in the related art are denoted by the same reference numerals.
【００１４】図２の（ａ）に示すように、挿口突部３を
形成するストッパリング３’は、外力を加えない状態で
はその内径Ｄ１が鋳鉄管１の外径Ｄ２よりも少し小さい
しまり嵌めとなるようにしている。また、このストッパ
リング３’は、溝部３ｂがストッパリング３’の内周面
における挿口先端寄り位置に形成された姿勢で配置さ
れ、この溝部３ｂにろう材からなるワイヤ１１を嵌入さ
せている。そして、ストッパリング３’の内周面３ａと
鋳鉄管１の挿口２におけるストッパリング３’を接合さ
せる箇所とにろう材用のフラックス（図示せず）を予め
塗布する。さらに、ストッパリング３’の挿口先端側に
配置される箇所の外周を溝部３ｂの近傍箇所までテーパ
加工させ、このテーパ面３ｄから溝部３ｂまでのストッ
パリング３’の肉厚を薄くさせて薄肉部３ｅを形成して
いる。As shown in FIG. 2A, the inner diameter D1 of the stopper ring 3 'forming the insertion projection 3 is slightly smaller than the outer diameter D2 of the cast iron tube 1 when no external force is applied. It is made to fit. The stopper ring 3 ′ is disposed in such a manner that the groove 3 b is formed at a position near the tip of the insertion opening on the inner peripheral surface of the stopper ring 3 ′, and the wire 11 made of brazing material is fitted into the groove 3 b. . Then, a flux (not shown) for a brazing material is applied in advance to the inner peripheral surface 3a of the stopper ring 3 'and the portion of the insertion opening 2 of the cast iron pipe 1 where the stopper ring 3' is joined. Further, the outer periphery of a portion of the stopper ring 3 'located on the front end side of the insertion opening is tapered to a position near the groove portion 3b, and the thickness of the stopper ring 3' from the tapered surface 3d to the groove portion 3b is reduced to make it thinner. A portion 3e is formed.
【００１５】次に、図２の（ｂ），（ｃ）に示すよう
に、ワイヤ１１を配設したストッパリング３’を、この
ストッパリング３’の挿口先端側に配置される一端部３
ｃから挿口奥側に向けて押圧することにより、挿口外周
面２ａに圧入状態で外嵌させる。この場合に、ストッパ
リング３’を挿口２の外周面２ａに外嵌させるためにス
トッパリング３’の挿口先端側に配置される一端部３ｃ
を挿口奥側に向けて押圧すると、押圧点がストッパリン
グ３’の薄肉部３ｅよりも内周寄りであるため、ストッ
パリング３’の薄肉部３ｅを屈曲点としてストッパリン
グ３’の一端部３ｃ側が内側に変形する。これにより、
ストッパリング３’の溝部３ｂの開口側が狭められてワ
イヤ１１はストッパリング３’の溝部３ｂ内に確実に保
持されて、ストッパリング３’が溝部３ｂから脱落する
ことが防止される。Next, as shown in FIGS. 2 (b) and 2 (c), the stopper ring 3 'on which the wire 11 is disposed is connected to the one end 3 of the stopper ring 3' at the front end of the insertion opening.
By pressing from c to the back side of the insertion hole, it is externally fitted in the insertion outer peripheral surface 2a in a press-fit state. In this case, in order to fit the stopper ring 3 ′ to the outer peripheral surface 2 a of the insertion opening 2, one end portion 3 c disposed on the distal end side of the insertion opening of the stopper ring 3 ′
Is pressed toward the inner side of the insertion opening, the pressing point is closer to the inner circumference than the thin portion 3e of the stopper ring 3 ', so that the thin portion 3e of the stopper ring 3' is used as a bending point and one end of the stopper ring 3 '. The 3c side is deformed inward. This allows
Since the opening side of the groove 3b of the stopper ring 3 'is narrowed, the wire 11 is securely held in the groove 3b of the stopper ring 3', and the stopper ring 3 'is prevented from dropping out of the groove 3b.
【００１６】この後、鋳鉄管１を加熱してストッパリン
グ３’の溝部３ｂ内のワイヤ１１を溶融させる。この場
合の加熱溶融方法としては、図１に示すように、鋳鉄管
１の挿口先端部側、すなわちワイヤ１１を配設している
側が上向きとなるように傾斜させた姿勢で管軸心ｘを中
心に回転させながら、鋳鉄管１の内周面側から加熱する
ことにより行う。この際の、傾斜角度θとしては５度〜
６０度が望ましい。すなわち、傾斜角度θが５度よりも
小さい場合は、溶融したろう材１１’があまり流れなく
て広がらず、また、傾斜角度θが６０度よりも大きい場
合は、溶融したろう材１１’が挿口２の外周面２ａとス
トッパリング３’の内周面３ａとの隙間を越えて流れ過
ぎてしまう。Thereafter, the cast iron tube 1 is heated to melt the wire 11 in the groove 3b of the stopper ring 3 '. As a heating and melting method in this case, as shown in FIG. 1, the pipe axis x is tilted so that the tip end side of the insertion opening of the cast iron pipe 1, that is, the side on which the wire 11 is disposed is upward. Is performed by heating from the inner peripheral surface side of the cast iron tube 1 while rotating around the center. At this time, the inclination angle θ is 5 degrees or more.
60 degrees is desirable. That is, when the inclination angle θ is smaller than 5 degrees, the molten brazing material 11 ′ does not flow much and does not spread, and when the inclination angle θ is greater than 60 degrees, the molten brazing material 11 ′ is inserted. It flows too much beyond the gap between the outer peripheral surface 2a of the mouth 2 and the inner peripheral surface 3a of the stopper ring 3 '.
【００１７】このように、加熱溶融時に適切な傾斜角度
θで傾斜させることにより、溶融したろう材１１’が、
挿口２の外周面２ａとストッパリング３’の内周面３ａ
との隙間における溝部３ｂより下方の側である挿口２の
奥側にその重量により流れて良好に広がることとなり、
この結果、挿口２と挿口突部３との間で十分な接合力を
得ることができる。このようにして、図２の（ｄ）に示
すように、ストッパリング３’と鋳鉄管１の挿口２とを
ろう材１１’により接合させて挿口２の外周に挿口突部
３を形成する。As described above, by inclining at an appropriate inclination angle θ during heating and melting, the molten brazing material 11 ′
Outer peripheral surface 2a of insertion opening 2 and inner peripheral surface 3a of stopper ring 3 '
Flows by the weight to the depth side of the insertion opening 2 which is the lower side of the groove portion 3b in the gap with the gap portion 3b and spreads favorably,
As a result, a sufficient joining force can be obtained between the insertion port 2 and the insertion projection 3. In this way, as shown in FIG. 2D, the stopper ring 3 'and the insertion port 2 of the cast iron pipe 1 are joined by the brazing material 11', and the insertion projection 3 is formed on the outer periphery of the insertion port 2. Form.
【００１８】そして最後に、図２の（ｅ）に示すよう
に、挿口２の先端外周面と挿口突部３の挿口先端側部分
にかけて再度テーパ加工して先端ほど細くなるようにテ
ーパ面１２を形成する。ここで、このテーパ加工を行う
に際して、ストッパリング３’の溝部３ｂを含んだ部分
を削り取って、最終的に溝部３ｂを有しない状態でスト
ッパリング３’と挿口２とを接合させた状態として挿口
突部３を形成する。Finally, as shown in FIG. 2E, the outer peripheral surface of the front end of the insertion port 2 and the front end portion of the insertion projection 3 are tapered again so that the front end becomes thinner. Surface 12 is formed. Here, when performing this taper processing, a portion including the groove 3b of the stopper ring 3 'is scraped off, and finally the stopper ring 3' and the insertion opening 2 are joined without the groove 3b. An insertion projection 3 is formed.
【００１９】なお、鋳鉄管１を水平に配置しながら加熱
溶融工程を行う従来の方法と、鋳鉄管１を傾斜させて配
置しながら加熱溶融工程を行う本願発明の方法と比較す
べく、直径２．４mmのワイヤ１１からなる銀ろうを配設
した口径２２０mm，厚み３mm，幅３２．４mmのストッパ
リング３’を、鋳鉄管１にろう付けした場合で比べてみ
た。その結果、加熱溶融工程で鋳鉄管１を水平に保持し
た従来の方法では、ろう材１１’の広がり方が不安定で
あり、離脱阻止力も不安定で、０．３Ｄｔｆ程度しか得
られなかったのに対し、加熱溶融工程で鋳鉄管１を例え
ば１５度の角度で傾斜させた本願発明の方法では、ろう
材１１’の広がり方が安定しており、離脱阻止力も安定
して０．４５Ｄｔｆと十分使用に耐えうる値が得られ
た。In order to compare the conventional method of performing the heating and melting step while arranging the cast iron tube 1 horizontally and the method of the present invention of performing the heating and melting step while arranging the cast iron pipe 1 at an angle, A stopper ring 3 ′ having a diameter of 220 mm, a thickness of 3 mm, and a width of 32.4 mm provided with a silver brazing made of a 0.4 mm wire 11 was compared with a case where the stopper ring 3 ′ was brazed to the cast iron pipe 1. As a result, in the conventional method in which the cast iron pipe 1 was held horizontally in the heating and melting step, the spread of the brazing material 11 ′ was unstable, the detachment prevention force was also unstable, and only about 0.3 Dtf was obtained. On the other hand, in the method of the present invention in which the cast iron pipe 1 is inclined at an angle of, for example, 15 degrees in the heating and melting step, the spread of the brazing material 11 ′ is stable, and the detachment prevention force is also stable, and is sufficiently 0.45 Dtf. A value acceptable for use was obtained.
【００２０】なお、鋳鉄管１やストッパリング３’の大
きさや、ろう材１０の種類が上記のものに限られるもの
ではないことは申すまでもない。It goes without saying that the size of the cast iron tube 1 and the stopper ring 3 'and the type of the brazing material 10 are not limited to those described above.
【００２１】[0021]
【発明の効果】以上のように本発明の鋳鉄管の挿口突部
形成方法によれば、内周面に形成した溝部にろう材を配
設したストッパリングを挿口に外嵌させた後に、ろう付
けによる接合箇所が溝部のろう材よりも下方となるよう
に鋳鉄管を傾斜させた姿勢で管軸心を中心に回転させな
がら加熱するので、溶融したろう材が、挿口外周面とス
トッパリングの内周面との隙間における溝部より下方の
側にその重量により流れて良好に広がることとなり、こ
れにより、挿口と挿口突部との間で十分な接合力を得る
ことができ、挿口突部によって十分な離脱阻止力を得る
ことができる。As described above, according to the method for forming an insertion projection of a cast iron pipe of the present invention, after a stopper ring in which a brazing material is disposed in a groove formed on an inner peripheral surface is externally fitted to the insertion port. Since the cast iron pipe is heated while rotating about the pipe axis in a posture in which the cast iron pipe is inclined so that the joining point by brazing is below the brazing material in the groove, the molten brazing material is The weight of the stopper ring and the inner peripheral surface of the gap is lower than the groove, so that it flows by its weight and spreads well, so that a sufficient joining force can be obtained between the insertion opening and the insertion projection. In addition, a sufficient detachment preventing force can be obtained by the insertion projection.
【図１】本発明の実施の形態にかかる鋳鉄管の挿口突部
形成方法における加熱溶融工程を示す断面図である。FIG. 1 is a cross-sectional view showing a heating and melting step in a method for forming an insertion projection of a cast iron pipe according to an embodiment of the present invention.
【図２】（ａ）〜（ｅ）はそれぞれ本発明の実施の形態
にかかる鋳鉄管の挿口突部形成方法における各工程を示
す断面図である。FIGS. 2A to 2E are cross-sectional views showing respective steps in a method for forming an insertion projection of a cast iron pipe according to an embodiment of the present invention.
【図３】鋳鉄管の継手箇所の断面図である。FIG. 3 is a sectional view of a joint portion of a cast iron pipe.
【図４】（ａ）〜（ｄ）はそれぞれ従来の鋳鉄管の挿口
突部形成方法における各工程を示す断面図である。FIGS. 4A to 4D are cross-sectional views showing respective steps in a conventional method for forming an insertion projection of a cast iron pipe.
【図５】従来の鋳鉄管の挿口突部形成方法における加熱
溶融工程を示す断面図である。FIG. 5 is a cross-sectional view showing a heating and melting step in a conventional method for forming an insertion projection of a cast iron tube.
１ 鋳鉄管 ２ 挿口 ２ａ 外周面 ３ 挿口突部 ３’ ストッパリング ３ａ 内周面 ３ｂ 溝部 １１ ワイヤ １１’ ろう材 ｘ 管軸心 DESCRIPTION OF SYMBOLS 1 Cast iron pipe 2 Insert 2a Outer peripheral surface 3 Insert projection 3 'Stopper ring 3a Inner peripheral surface 3b Groove 11 Wire 11' Brazing material x Pipe axis
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭49−76752（ＪＰ，Ａ) 特開 平７−27266（ＪＰ，Ａ) 特開 平９−79439（ＪＰ，Ａ) 特許2778909（ＪＰ，Ｂ２) 実公 昭45−19975（ＪＰ，Ｙ１) 実公 昭46−21147（ＪＰ，Ｙ１) (58)調査した分野(Int.Cl.7，ＤＢ名) B23K 1/14 B23K 1/18 B23K 1/19 C21D 9/08 F16L 13/08 F16L 13/12 F16L 21/00 F16L 21/02 F16L 21/08 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-49-76752 (JP, A) JP-A-7-27266 (JP, A) JP-A-9-79439 (JP, A) Patent 2778909 (JP, A) B2) Jikken Sho 45-19975 (JP, Y1) Jikken 46-21147 (JP, Y1) (58) Fields investigated (Int. Cl. 7 , DB name) B23K 1/14 B23K 1/18 B23K 1 / 19 C21D 9/08 F16L 13/08 F16L 13/12 F16L 21/00 F16L 21/02 F16L 21/08
Claims (1)
パリングの内周面に溝部を形成し、このストッパリング
の溝部にろう材を配設し、このろう材を配設したストッ
パリングを、鋳鉄管の挿口と受口とが接続される接続部
における挿口外周面に外嵌させ、ろう材配設箇所を含む
部分を加熱してろう材を溶融させることにより、ストッ
パリングと鋳鉄管の挿口とをろう付け接合させて接続部
離脱防止用の挿口突部を形成する鋳鉄管の挿口突部形成
方法であって、ろう材配設箇所を含む部分を加熱するに
際し、ろう付けによる接合箇所が溝部のろう材よりも下
方となるように鋳鉄管を傾斜させた姿勢で管軸心を中心
に回転させながら加熱して、溶融したろう材を、挿口外
周面とストッパリングの内周面との隙間における溝部よ
り下方の側に広げることを特徴とする鋳鉄管の挿口突部
形成方法。A groove is formed in an inner peripheral surface of a stopper ring which finally becomes an insertion projection of a cast iron pipe, a brazing material is provided in the groove of the stopper ring, and a stopper provided with the brazing material is provided. The stopper ring is formed by externally fitting the ring to the outer peripheral surface of the insertion port at the connection portion where the insertion port and the receiving port of the cast iron tube are connected, and heating the portion including the brazing material disposing portion to melt the brazing material. A method for forming an insertion projection of a cast iron pipe, in which an insertion projection for preventing connection portion detachment is formed by brazing and joining an insertion opening of a cast iron pipe to a portion including a brazing material disposing portion. At the time of heating, the molten brazing material was heated while rotating around the pipe axis in a posture in which the cast iron pipe was inclined so that the joint part by brazing was below the brazing material in the groove, Spread below the groove in the gap between the stopper ring and the inner peripheral surface of the stopper ring A method for forming an insertion projection of a cast iron tube, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23795295A JP3267476B2 (en) | 1995-09-18 | 1995-09-18 | Method of forming the insertion protrusion of cast iron pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23795295A JP3267476B2 (en) | 1995-09-18 | 1995-09-18 | Method of forming the insertion protrusion of cast iron pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0979440A JPH0979440A (en) | 1997-03-25 |
| JP3267476B2 true JP3267476B2 (en) | 2002-03-18 |
Family
ID=17022906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23795295A Expired - Fee Related JP3267476B2 (en) | 1995-09-18 | 1995-09-18 | Method of forming the insertion protrusion of cast iron pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3267476B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4484390B2 (en) * | 2001-04-03 | 2010-06-16 | 第一高周波工業株式会社 | Manufacturing method of composite cylinder / column |
| JP7229522B2 (en) * | 2019-03-20 | 2023-02-28 | ヤマトプロテック株式会社 | Fire extinguisher and fire extinguisher manufacturing method |
-
1995
- 1995-09-18 JP JP23795295A patent/JP3267476B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0979440A (en) | 1997-03-25 |
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