JPH05288295A - Manufacture of pipe joint - Google Patents
Manufacture of pipe jointInfo
- Publication number
- JPH05288295A JPH05288295A JP8698692A JP8698692A JPH05288295A JP H05288295 A JPH05288295 A JP H05288295A JP 8698692 A JP8698692 A JP 8698692A JP 8698692 A JP8698692 A JP 8698692A JP H05288295 A JPH05288295 A JP H05288295A
- Authority
- JP
- Japan
- Prior art keywords
- diameter
- synthetic resin
- mold
- reduced
- 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.)
- Granted
Links
Landscapes
- Branch Pipes, Bends, And The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、特に径違いソケット、
或いは偏心径違いソケット等の縮径部を有する管継手の
製造方法に関する。BACKGROUND OF THE INVENTION The present invention is particularly applicable to reducing sockets,
Alternatively, the present invention relates to a method for manufacturing a pipe joint having a reduced diameter portion such as an eccentric diameter difference socket.
【０００２】[0002]
【従来の技術】従来、縮径部を有する管継手の製造方法
としては、次のような方法が知られている。 （１）図３に示す通り、所要長さに切断した合成樹脂管
１０を加熱した後、この合成樹脂管１０を縮径内壁面を
有する型１１内に内挿し、Ｃ矢印方向に合成樹脂管１０
を押圧して合成樹脂管１０を型１１の縮径内壁面に圧接
させ、冷却、離型して縮径部１２を形成し、この縮径部
１２に小口径直管１４を溶融接合させる方法。 （２）図４に示す通り、合成樹脂板１５を縮径部１７の
展開形状に切断し、これを加熱して縮径内壁面を有する
型１６内に内挿し、次いでＤ矢印方向に合成樹脂板１５
を押圧して、合成樹脂板１５を型１６の縮径内壁面に圧
接させ、、冷却、離型した後、突き合わせ面１８を溶融
接合して縮径部１７を形成し、この縮径部１７の両端に
大口径直管１９と小口径直管２０とをそれぞれ溶融接合
する方法。 （３）図５に示す通り、縮径部２４の展開形状に切断さ
れた合成樹脂板２１を加熱して、縮径外壁面を有する型
２２に巻き付け、加圧、冷却、離型した後、突き合わせ
面２３を溶融接合して縮径部２４を形成し、この縮径部
２４の両端に大口径直管２５と小口径直管２６とをそれ
ぞれ溶融接合する方法。2. Description of the Related Art Conventionally, the following method has been known as a method for manufacturing a pipe joint having a reduced diameter portion. (1) As shown in FIG. 3, after heating the synthetic resin pipe 10 cut into a required length, the synthetic resin pipe 10 is inserted into a mold 11 having an inner wall surface with a reduced diameter, and the synthetic resin pipe is directed in the direction of the arrow C. 10
Is pressed to bring the synthetic resin tube 10 into pressure contact with the inner wall surface of the mold 11 having a reduced diameter, and then cooled and released to form the reduced diameter portion 12, and the small diameter straight pipe 14 is melt-bonded to the reduced diameter portion 12. (2) As shown in FIG. 4, the synthetic resin plate 15 is cut into the expanded shape of the reduced diameter portion 17, heated and inserted into the mold 16 having the reduced diameter inner wall surface, and then in the direction of the arrow D. Board 15
Is pressed to bring the synthetic resin plate 15 into pressure contact with the inner wall surface of the reduced diameter of the mold 16, and after cooling and releasing, the butted surfaces 18 are melt-bonded to form the reduced diameter portion 17, and the reduced diameter portion 17 A method for melting and joining a large-diameter straight pipe 19 and a small-diameter straight pipe 20 to both ends of each. (3) As shown in FIG. 5, the synthetic resin plate 21 cut into the expanded shape of the reduced diameter portion 24 is heated and wound around the mold 22 having the reduced diameter outer wall surface, pressurized, cooled, and released. A method in which the butt surfaces 23 are fusion-bonded to each other to form the reduced diameter portion 24, and the large-diameter straight pipe 25 and the small-diameter straight pipe 26 are fusion-bonded to both ends of the reduced diameter portion 24, respectively.
【０００３】[0003]
【発明が解決しようとする課題】しかし上記（１）の方
法（図３の方法）では、急角度に縮径される場合、例え
ば大口径直管と小口径直管との管径差が大きくて、縮径
部の軸方向長さが短い場合には、合成樹脂管が型内に内
挿、押圧される縮径時に、合成樹脂管が座屈するので、
縮径角度の小さいもの、例えば大口径直管と小口径直管
との管径差に対して縮径部の軸方向長さが長いものしか
製造できない。また急角度の縮径が必要な場合には、管
が座屈しないように、縮径部を２段、３段と分けて縮径
しなければならず、工数が増え、加工精度にも影響する
等の問題が生ずる。また上記（２）の方法、或いは上記
（３）の方法では、溶接箇所が多く、その作業に多大の
時間を要する。However, in the method (1) (the method shown in FIG. 3), when the diameter is reduced to a steep angle, for example, the large diameter difference between the large diameter straight pipe and the small diameter straight pipe is large. When the axial length of the diameter-reduced portion is short, the synthetic resin tube buckles when the synthetic resin tube is inserted into the mold and pressed to reduce the diameter.
Only those having a small diameter reduction angle, for example, those having a long axial length of the diameter reduction portion with respect to the diameter difference between the large diameter straight pipe and the small diameter straight pipe can be manufactured. In addition, when a sharp angle reduction is required, the diameter reduction part must be divided into two steps and three steps to prevent the tube from buckling, increasing the number of steps and affecting the processing accuracy. Problems such as doing occur. Further, in the method of (2) or the method of (3), there are many welding points and the work requires a lot of time.
【０００４】本発明は、以上の点に鑑み、溶接箇所の少
ない、急角度の縮径が容易な、急角度に縮径された縮径
部を有する管継手の製造方法を提供することを目的とす
る。In view of the above points, it is an object of the present invention to provide a method for manufacturing a pipe joint having a reduced diameter portion at a steep angle and having a small number of welded portions, which makes it easy to reduce the diameter at a steep angle. And
【０００５】[0005]
【課題を解決するための手段】本発明の管継手の製造方
法は、合成樹脂管の一部を縮径部の展開形状に切断し、
この展開形状部を含む合成樹脂管の端部を加熱した後、
該合成樹脂管を該展開形状部を先にして縮径内壁面を有
する型に内挿、又は縮径外壁面を有する型に外挿させ、
次いで該展開形状部を型に圧接させ、冷却、離型した
後、該展開形状部の突き合わせ面を溶融接合して縮径部
を形成し、次いでこの縮径部に直管を溶融接合すること
を特徴とするものである。A method for manufacturing a pipe joint according to the present invention comprises cutting a part of a synthetic resin pipe into a developed shape of a reduced diameter portion,
After heating the end of the synthetic resin tube including this expanded shape part,
The synthetic resin tube is inserted into a mold having a reduced diameter inner wall surface or the mold having a reduced diameter outer wall surface by inserting the synthetic resin tube first.
Then, the expanded shape part is pressed against a mold, cooled, and released, and then the abutting surface of the expanded shape part is fusion-bonded to form a reduced diameter portion, and then a straight pipe is melt-bonded to the reduced diameter portion. It is characterized by.
【０００６】本発明の管継手の製造方法に用いられる合
成樹脂管は、塩化ビニル樹脂、ポリプロピレン樹脂、ポ
リエチレン樹脂等の汎用熱可塑性樹脂管が好適に用いら
れる。また型の材質は、製造温度と製造圧力に耐えられ
るものであれば、特に限定されない。合成樹脂管の切断
は、所望の管継手の縮径形状に応じてＶ型に切断するの
が望ましい。またこの切断面をあらかじめ面取りしてお
けば、溶融接合が容易になる。合成樹脂管の加熱は周知
の熱ヒーター、オイルバス等で行うことができる。型に
内挿された合成樹脂管の展開形状部を縮径内壁面を有す
る型に圧接する方法としては、硬質ウレタン等のコアを
内側に挿入する方法等を用いることができる。また型の
外面に外挿された合成樹脂管の展開形状部を縮径外壁面
を有する型に圧接させるには、ゴムバンド等の帯状のも
ので合成樹脂管の展開形状部を締めつける方法、外側か
ら合成樹脂管の展開形状部を型で締めつける方法等を用
いることができる。突き合わせ面の溶融接合は、ホット
ジェットによる溶接でも、突き合わせ溶接による接合で
もどちらでもよい。As the synthetic resin pipe used in the method for producing a pipe joint of the present invention, a general-purpose thermoplastic resin pipe made of vinyl chloride resin, polypropylene resin, polyethylene resin or the like is preferably used. The material of the mold is not particularly limited as long as it can withstand the manufacturing temperature and the manufacturing pressure. It is desirable that the synthetic resin pipe is cut into a V shape according to the desired reduced diameter shape of the pipe joint. Further, if this cut surface is chamfered in advance, fusion bonding becomes easy. The heating of the synthetic resin pipe can be performed by a well-known heat heater, oil bath or the like. As a method of pressing the developed shape portion of the synthetic resin tube inserted in the mold to the mold having the reduced diameter inner wall surface, a method of inserting a core of hard urethane or the like into the inside can be used. In order to press the expanded shape part of the synthetic resin pipe externally fitted on the outer surface of the mold into pressure contact with the mold having the outer wall of reduced diameter, a method of tightening the expanded shape part of the synthetic resin pipe with a band-shaped object such as a rubber band, the outside Therefore, it is possible to use a method of tightening the developed shape portion of the synthetic resin pipe with a mold. The fusion joining of the butt surfaces may be either hot jet welding or butt welding.
【０００７】[0007]
【作用】合成樹脂管の一部が縮径部の展開形状に切断さ
れているので、縮径加工時に、縮径部を形成するための
加圧力を少なくすることができ、これにより管の座屈等
の恐れがなくなり、急角度の縮径部も一度に縮径可能と
なる。また大口径側の直管部はそのまま利用できるの
で、溶接箇所が少なくなる。Since a part of the synthetic resin pipe is cut into the expanded shape of the reduced diameter portion, the pressing force for forming the reduced diameter portion can be reduced at the time of the diameter reduction processing. There is no fear of bending, and it is possible to reduce the diameter of a steeply angled diameter portion at once. In addition, since the straight pipe portion on the large diameter side can be used as it is, the number of welding points is reduced.
【０００８】[0008]
【実施例】以下本発明をその実施例を示す図面に基づい
て説明する。図１は本発明の管継手の製造方法の一実施
例の偏心径違いソケットの製造工程を示す説明図であ
る。４は長尺の合成樹脂管を所定長さに切断した合成樹
脂管である。１は偏心径違いソケットの縮径部である。
先ず合成樹脂管４の一部を縮径部１の展開形状に切断し
て展開形状部５を形成する。次いでこの展開形状部５を
含む合成樹脂管４の端部を加熱した後、展開形状部５を
先にして合成樹脂管４を、縮径内壁面２７が形成されて
いる型６の内側に内挿する。次いで合成樹脂管４をＡ矢
印の方向に押圧し、図示しないコアを内側に挿入して、
合成樹脂管４の展開形状部５を縮径内壁面２７に圧接す
る。この圧接により展開形状部５を型６の縮径内壁面２
７に沿って変形させ、所定の縮径形状を形成する。次い
でこれを冷却、離型した後、突き合わせ面７を溶融接合
して縮径部１を形成し、この縮径部１に直管３を溶融接
合し、偏心径違いソケットを製造する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing the embodiments thereof. FIG. 1 is an explanatory view showing a manufacturing process of an eccentric difference diameter socket of an embodiment of a method for manufacturing a pipe joint of the present invention. Reference numeral 4 is a synthetic resin pipe obtained by cutting a long synthetic resin pipe into a predetermined length. Reference numeral 1 is a reduced diameter portion of the eccentric difference diameter socket.
First, a part of the synthetic resin pipe 4 is cut into the expanded shape of the reduced diameter portion 1 to form the expanded shape portion 5. Next, after heating the end portion of the synthetic resin tube 4 including the expanded shape portion 5, the synthetic resin tube 4 is placed inside the mold 6 in which the reduced diameter inner wall surface 27 is formed, with the expanded shape portion 5 first. Insert. Next, press the synthetic resin pipe 4 in the direction of the arrow A, insert a core (not shown) inside,
The developed shape portion 5 of the synthetic resin tube 4 is pressed against the reduced diameter inner wall surface 27. Due to this pressure contact, the expanded shape portion 5 is moved to the inner wall surface 2
Deformation is performed along 7 to form a predetermined reduced diameter shape. Next, this is cooled and released from the mold, and then the abutting surface 7 is melt-bonded to form the reduced diameter portion 1, and the straight pipe 3 is melt-bonded to the reduced diameter portion 1 to manufacture an eccentric reduced diameter socket.
【０００９】図２は本発明の管継手の製造方法の他の実
施例の説明図である。先ず図１の方法と同じように合成
樹脂管４の一部を、縮径部１の展開形状に切断して展開
形状部５を形成する。次いでこの展開形状部５を含む合
成樹脂管４の端部を加熱した後、展開形状部５を先にし
て合成樹脂管４を、縮径外壁面２８が形成されている型
９の外側にＢ矢印の方向に外挿する。次いで展開形状部
５を、図示しないゴムバンドで型９の縮径外壁面２８に
向けて半径方向に押圧する。この押圧により、展開形状
部５を型９の縮径外壁面２８に沿って変形させ、所定の
縮径形状を形成する。次いでこれを冷却、離型した後、
突き合わせ面７を溶融接合して縮径部１を形成し、この
縮径部１に直管３を溶融接合し、偏心径違いソケットを
製造する。FIG. 2 is an explanatory view of another embodiment of the pipe joint manufacturing method of the present invention. First, as in the method of FIG. 1, a part of the synthetic resin pipe 4 is cut into the expanded shape of the reduced diameter portion 1 to form the expanded shape portion 5. Next, after heating the end of the synthetic resin tube 4 including the expanded shape part 5, the synthetic resin tube 4 is placed on the outside of the mold 9 in which the reduced diameter outer wall surface 28 is formed, with the expanded shape part 5 first. Extrapolate in the direction of the arrow. Next, the expanded shape portion 5 is pressed in the radial direction toward the reduced outer wall surface 28 of the mold 9 with a rubber band (not shown). By this pressing, the expanded shape portion 5 is deformed along the diameter-reduced outer wall surface 28 of the mold 9 to form a predetermined diameter-reduced shape. Then, after cooling and releasing it,
The butt face 7 is fusion-bonded to form the reduced diameter portion 1, and the straight pipe 3 is fusion-bonded to the reduced diameter portion 1 to manufacture an eccentric diameter difference socket.
【００１０】[0010]
【発明の効果】急角度の縮径部も一度に縮径することが
できるので、縮径部を有する、特に急角度の縮径部を有
する径違いソケット、偏心径違いソケット等の管継手を
容易に製造することができる。また大口径側の直管部は
そのまま利用できるので、溶接箇所を少なくすることが
でき、溶接工数を削減することができる。EFFECTS OF THE INVENTION Since it is possible to reduce the diameter of a sharp-angled portion at one time, a pipe joint having a diameter-reduced portion, in particular, a reduced-diameter socket, an eccentric diameter-reduced socket, etc. It can be easily manufactured. Further, since the straight pipe portion on the large diameter side can be used as it is, the number of welding points can be reduced and the man-hours for welding can be reduced.
【００１１】[0011]
【図１】本発明の管継手の製造方法の一実施例の説明図
である。FIG. 1 is an explanatory view of an embodiment of a method for manufacturing a pipe joint of the present invention.
【図２】本発明の管継手の製造方法の他の実施例の説明
図である。FIG. 2 is an explanatory view of another embodiment of the pipe joint manufacturing method of the present invention.
【図３】従来の管継手の製造方法の説明図である。FIG. 3 is an explanatory view of a conventional method for manufacturing a pipe joint.
【図４】従来の他の管継手の製造方法の説明図である。FIG. 4 is an explanatory view of another conventional method for manufacturing a pipe joint.
【図５】従来の他の管継手の製造方法の説明図である。FIG. 5 is an explanatory view of another conventional method for manufacturing a pipe joint.
１，１２，１７，２４ 縮径部 ３ 直管 ４，１０ 合成樹脂管 ５ 展開形状部 ６，９，１１，１６，２２ 型 ７，１８，２３ 突き合わせ面 １４，２０，２６ 小口径直管 １５，２１ 合成樹脂板 １９，２５ 大口径直管 ２７ 縮径内壁面 ２８ 縮径外壁面 1,12,17,24 Reduced diameter part 3 Straight pipe 4,10 Synthetic resin pipe 5 Expanded shape part 6,9,11,16,22 type 7,18,23 Butt face 14,20,26 Small diameter straight pipe 15, 21 Synthetic resin plate 19,25 Large diameter straight pipe 27 Reduced inner wall surface 28 Reduced outer wall surface
Claims (1)
に切断し、この展開形状部を含む合成樹脂管の端部を加
熱した後、該合成樹脂管を該展開形状部を先にして縮径
内壁面を有する型に内挿、又は縮径外壁面を有する型に
外挿させ、次いで該展開形状部を型に圧接させ、冷却、
離型した後、該展開形状部の突き合わせ面を溶融接合し
て縮径部を形成し、次いでこの縮径部に直管を溶融接合
することを特徴とする管継手の製造方法。1. A part of a synthetic resin pipe is cut into a developed shape of a reduced diameter portion, an end portion of the synthetic resin pipe including the developed shape portion is heated, and then the synthetic resin pipe is placed first in the developed shape portion. And inserted into a mold having a reduced-diameter inner wall surface, or extrapolated to a mold having a reduced-diameter outer wall surface, then the developed shape portion is pressed against the mold, and cooled,
After releasing from the mold, the butted surfaces of the expanded shape portion are fusion-bonded to each other to form a reduced diameter portion, and then a straight pipe is fusion-bonded to the reduced diameter portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8698692A JP3176419B2 (en) | 1992-04-08 | 1992-04-08 | Pipe Fitting Manufacturing Method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8698692A JP3176419B2 (en) | 1992-04-08 | 1992-04-08 | Pipe Fitting Manufacturing Method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05288295A true JPH05288295A (en) | 1993-11-02 |
| JP3176419B2 JP3176419B2 (en) | 2001-06-18 |
Family
ID=13902190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8698692A Expired - Fee Related JP3176419B2 (en) | 1992-04-08 | 1992-04-08 | Pipe Fitting Manufacturing Method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3176419B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7055866B2 (en) * | 2003-04-10 | 2006-06-06 | Kohler Co. | Non-damming coupler |
-
1992
- 1992-04-08 JP JP8698692A patent/JP3176419B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7055866B2 (en) * | 2003-04-10 | 2006-06-06 | Kohler Co. | Non-damming coupler |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3176419B2 (en) | 2001-06-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |