JPH0442975B2 - - Google Patents
Info
- Publication number
- JPH0442975B2 JPH0442975B2 JP23358584A JP23358584A JPH0442975B2 JP H0442975 B2 JPH0442975 B2 JP H0442975B2 JP 23358584 A JP23358584 A JP 23358584A JP 23358584 A JP23358584 A JP 23358584A JP H0442975 B2 JPH0442975 B2 JP H0442975B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- rubber ring
- groove
- attaching
- 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
Links
- 238000000034 method Methods 0.000 claims description 17
- 238000000465 moulding Methods 0.000 claims description 12
- 229920003002 synthetic resin Polymers 0.000 claims description 12
- 239000000057 synthetic resin Substances 0.000 claims description 12
- 229920005989 resin Polymers 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 239000002826 coolant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
- B29C57/02—Belling or enlarging, e.g. combined with forming a groove
- B29C57/04—Belling or enlarging, e.g. combined with forming a groove using mechanical means
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ゴム輪型受口の成形方法に関し、更
に詳しくはゴム輪装着用溝の内周面が平滑にして
寸法精度の高いゴム輪型受口が得られる成形方法
に関する。Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for molding a rubber ring type socket, and more specifically to a rubber ring with a smooth inner circumferential surface of a rubber ring mounting groove and high dimensional accuracy. This invention relates to a molding method for obtaining a mold socket.
（従来技術）
管同志を接続する受口としては、管端内周にゴ
ム輪装着用溝を設け、該溝内にゴムパツキングを
装着した、所謂ゴム輪型受口と称するものがあ
る。(Prior Art) As a socket for connecting pipes, there is a so-called rubber ring type socket in which a rubber ring mounting groove is provided on the inner periphery of the pipe end and a rubber packing is mounted in the groove.
一般に、この受口の成形は、合成樹脂管の一端
部を加熱軟化した後、(a)管端部に内型を圧入て拡
経する方法、(b)管端部に圧力流体を導入して外型
に密着するまで膨出成形する方法がある。 In general, this socket is formed by heating and softening one end of a synthetic resin pipe, and then (a) press-fitting an inner mold into the pipe end to expand the diameter; or (b) introducing pressurized fluid into the pipe end. There is a method of bulge molding until it adheres to the outer mold.
（発明が解決しようとする問題点）
しかしながら、前者(a)の成形方法は、ゴム輪装
着溝を膨出成形する環状突起がアンダーカツトと
なるために内型を分割構造にして縮径できるよう
にしなければならず、単に金型費用が高価となる
だけでなく、成形したゴム輪装着用溝の内周面に
分割型のパーテイングラインができて水密性が低
下するという問題があつた。(Problem to be Solved by the Invention) However, in the former molding method (a), the annular protrusion that bulges out the rubber ring mounting groove becomes an undercut, so the inner mold is divided into a split structure so that the diameter can be reduced. This not only increases the cost of the mold, but also creates a split parting line on the inner circumferential surface of the molded rubber ring mounting groove, which reduces watertightness.
また、後者(b)の成形方法は、管端部に加圧流体
を導入して膨脹した管外周面を外型に密着させる
ので管の外径寸法は正確となるが、その内周側は
拘束されていないので、特に合成樹脂管の肉厚に
ばらつきがある場合にはゴム輪装着用溝の内径が
一定しないという問題があつた。 In addition, in the latter forming method (b), pressurized fluid is introduced into the tube end and the expanded tube outer circumferential surface is brought into close contact with the outer mold, so the outer diameter of the tube is accurate, but the inner circumference Since it is not constrained, there is a problem that the inner diameter of the groove for attaching the rubber ring is not constant, especially when the thickness of the synthetic resin pipe varies.
（問題点を解決するための手段）
本発明は、かかる従来の成形方法の欠点を解消
すべく鋭意検討の結果成し得たものであつて、合
成樹脂管の一端部を加熱軟化し、該管端部に環状
突起を有する内型を圧入して拡径すると共に、前
記環状突起によつて外方に膨出したゴム輪装着用
溝を成形し、次いで該ゴム輪装着用溝の部分を樹
脂の溶融温度より若干低い温度まで加熱して所定
時間保持し、しかる後当該部分を樹脂の軟化温度
まで冷却して内型を無理抜きするものである。(Means for Solving the Problems) The present invention was achieved as a result of intensive studies in order to eliminate the drawbacks of the conventional molding methods. An inner mold having an annular projection is press-fitted into the tube end to enlarge the diameter, and a groove for attaching a rubber ring is formed to bulge outward by the annular protrusion, and then the groove for attaching the rubber ring is It is heated to a temperature slightly lower than the melting temperature of the resin, held for a predetermined time, and then cooled to the softening temperature of the resin, and the inner mold is forcefully removed.
この成形方法が適用できる合成樹脂管として
は、塩化ビニル樹脂管、ポリエチレン樹脂管等の
熱可塑性合成樹脂管が挙げられるが、以下塩化ビ
ニル樹脂管の一端部に受口を成形する本発明の具
体的実施例につき、詳細に説明する。 Examples of synthetic resin pipes to which this molding method can be applied include thermoplastic synthetic resin pipes such as vinyl chloride resin pipes and polyethylene resin pipes. A specific example will be explained in detail.
（実施例）
第１図は本発明の成形工程を示す縦断面図であ
つて、上半図に内型の圧入工程を、下半図に内型
の無理抜き工程を示した。(Example) FIG. 1 is a longitudinal sectional view showing the molding process of the present invention, with the upper half showing the press-fitting process of the inner mold, and the lower half showing the forcing process of removing the inner mold.
図中符号１は内型、２は外型、Ｐは塩化ビニル
樹脂からなる合成樹脂管である。 In the figure, reference numeral 1 is an inner mold, 2 is an outer mold, and P is a synthetic resin pipe made of vinyl chloride resin.
内型１は先端型１１と後型１２とからなり、先
端型１１には連結棒１１０が接続して、該連結棒
１１０に後型１２がスライド自在に接続してい
る。先端型１１および後型１２は、合成樹脂管Ｐ
の外径より若干大きい外径を有し、後型１２の外
周面には環状突起１２０が設けられ、先端型１１
の先端部は縮径して合成樹脂管Ｐの内径とほぼ等
しくなつている。 The inner mold 1 consists of a tip mold 11 and a rear mold 12. A connecting rod 110 is connected to the leading mold 11, and the rear mold 12 is slidably connected to the connecting rod 110. The tip mold 11 and the rear mold 12 are made of synthetic resin pipe P.
An annular protrusion 120 is provided on the outer peripheral surface of the rear mold 12, and the tip mold 11 has an outer diameter slightly larger than that of the rear mold 12.
The diameter of the tip of the pipe P is reduced to be approximately equal to the inner diameter of the synthetic resin pipe P.
一方、外型２は分割型となつており、各分割型
は径方向に拡大・縮小できるように構成されてい
る。この外型２の内周面は、前記後型１２の外周
面に設けた環状突起１２０と対応する凹溝状に形
成されており、該外型２内には熱媒体を流通させ
るための通孔２１が設けられている。 On the other hand, the outer mold 2 is a split mold, and each split mold is configured to be able to expand and contract in the radial direction. The inner circumferential surface of the outer mold 2 is formed into a groove shape corresponding to the annular protrusion 120 provided on the outer circumferential surface of the rear mold 12, and a passage for circulating a heat medium is provided in the outer mold 2. A hole 21 is provided.
本発明においては、まず塩化ビニル樹脂管Ｐの
一端部を90〜140度に加熱軟化し、次いで第１図
の上半図に示した如く、該管端部に内型１を圧入
する。この内型１の圧入によつて、合成樹脂管Ｐ
の一端部は拡径し、環状突起１２０によつて外方
向に膨出したゴム輪装着用溝が成形される。この
圧入工程の際に、合成樹脂管Ｐの先端部P1は、
上半図に破線で示した如く環状突起１２０に乗り
上がつて拡開するが、この部分に残留している応
力歪によつてもとの状態まで収縮して後型１２に
密着する。 In the present invention, first, one end of the vinyl chloride resin pipe P is heated and softened to 90 to 140 degrees, and then, as shown in the upper half of FIG. 1, the inner mold 1 is press-fitted into the end of the pipe. By press-fitting the inner mold 1, the synthetic resin pipe P
One end is enlarged in diameter, and an annular protrusion 120 forms a groove for attaching a rubber ring that bulges outward. During this press-fitting process, the tip P 1 of the synthetic resin pipe P is
As shown by the broken line in the upper half figure, it rides on the annular protrusion 120 and expands, but due to the stress strain remaining in this part, it contracts back to its original state and comes into close contact with the rear mold 12.
次に、外型２の通孔２１内に加熱媒体を流通さ
せて昇温したのち、該外型２を縮径して前記ゴム
輪装着用溝の外周面に圧着させ、該部分を150〜
190度に加熱して所定時間保持する。この熱処理
によつて、ゴム輪装着用溝の部分に残留していた
応力歪は完全に消去される。 Next, a heating medium is passed through the through hole 21 of the outer mold 2 to raise the temperature, and then the outer mold 2 is reduced in diameter and crimped onto the outer circumferential surface of the groove for attaching the rubber ring.
Heat to 190 degrees and hold for a specified time. This heat treatment completely eliminates stress and strain remaining in the groove for attaching the rubber ring.
しかる後、外型２の通孔２１内に冷却媒体を流
通させてゴム輪装着用溝の部分を90度近辺まで冷
却し、下半図に示した如く、外型２を拡径すると
共に後型１２を無理抜きする。この無理抜き工程
の際に、ゴム輪装着用溝の先端部P2は、下半図
に破線で示した如く環状突起１２０に押し開らか
れて拡開するが、この部分に残留している応力歪
によつてもとの状態に収縮する。この後型１２の
無理抜き後、先端型１１を後退させれば、本発明
の成形工程は完了するが、第１図の下半図に示し
たように、合成樹脂管Ｐの先端部P2を後型１２
に密着させた状態で先端型１１と後型１２との間
Ｈに冷却空気を圧入し、ゴム輪装着用溝の収縮を
抑えるながら冷却固化させるとよい。 After that, a cooling medium is passed through the through hole 21 of the outer mold 2 to cool the groove for attaching the rubber ring to around 90 degrees, and as shown in the lower half of the figure, the diameter of the outer mold 2 is expanded and the rear Forcibly remove the mold 12. During this forced removal process, the tip P2 of the rubber ring mounting groove is pushed open by the annular protrusion 120 and expanded as shown by the broken line in the lower half of the figure, but some remains in this part. Shrinks to its original state due to stress and strain. After forcibly removing the rear mold 12, the molding process of the present invention is completed by retracting the tip mold 11. However, as shown in the lower half of FIG . The rear type 12
It is preferable to press cooling air into the space H between the tip mold 11 and the rear mold 12 while the molds are in close contact with each other, and to cool and solidify while suppressing shrinkage of the groove for attaching the rubber ring.
以上の成形工程を経て、ゴム輪装着用溝の内周
面が平滑にして、寸法精度の高い受口が得られ
る。 Through the above molding process, the inner circumferential surface of the rubber ring mounting groove is smoothed, and a socket with high dimensional accuracy is obtained.
（発明の効果）
以上に述べた如く、本発明の受口成形方法は、
合成樹脂管の一端部を加熱軟化し、該管端部に内
型を圧入して拡径受口を成形した後、当該部分に
熱処理を施し、次いでこの部分を軟化温度に冷却
してから内型を無理抜きするだけであるので、ゴ
ム輪装着用溝を有する受口の成形が極めて簡単に
行なえる。(Effects of the invention) As described above, the socket molding method of the present invention
One end of the synthetic resin pipe is heated and softened, and an inner mold is press-fitted into the end of the pipe to form an enlarged diameter socket.Then, this part is heat treated, and then this part is cooled to a softening temperature before being heated and softened. Since the mold is simply forcefully removed, the socket having the groove for attaching the rubber ring can be formed extremely easily.
かくして得られたゴム輪型受口は、ゴム輪装着
溝の内周面が平滑にして寸法精度が高いので、極
めて高い水密性を維持することができる。 The thus obtained rubber ring type socket has a smooth inner circumferential surface of the rubber ring mounting groove and has high dimensional accuracy, so that extremely high watertightness can be maintained.
第１図は本発明の成形工程の一実施例を示す縦
断面図である。
１……内型、１１……先端型、１２……後型、
２……外型、Ｐ……合成樹脂管。
FIG. 1 is a longitudinal sectional view showing an embodiment of the molding process of the present invention. 1...Inner mold, 11...Tip mold, 12...Rear mold,
2...outer mold, P...synthetic resin pipe.
Claims (1)
環状突起を有する内型を圧入して拡径すると共
に、前記環状突起によつて外方に膨出したゴム輪
装着用溝を成形し、次いで該ゴム輪装着用溝の部
分を樹脂の溶融温度より若干低い温度まで加熱し
て所定時間保持し、しかる後当該部分を樹脂の軟
化温度まで冷却して内型を無理抜きすることを特
徴とするゴム輪型受口の成形方法。1 The end of a synthetic resin pipe is heated and softened, and an inner mold having an annular projection is press-fitted into the end of the pipe to enlarge the diameter, and a groove for attaching a rubber ring bulged outward by the annular projection is formed. Molding, then heating the part of the groove for attaching the rubber ring to a temperature slightly lower than the melting temperature of the resin and holding it for a predetermined time, then cooling the part to the softening temperature of the resin and forcefully removing the inner mold. A method for forming a rubber ring type socket characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23358584A JPS61110532A (en) | 1984-11-06 | 1984-11-06 | Molding methoid of rubber band type socket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23358584A JPS61110532A (en) | 1984-11-06 | 1984-11-06 | Molding methoid of rubber band type socket |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61110532A JPS61110532A (en) | 1986-05-28 |
| JPH0442975B2 true JPH0442975B2 (en) | 1992-07-15 |
Family
ID=16957374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23358584A Granted JPS61110532A (en) | 1984-11-06 | 1984-11-06 | Molding methoid of rubber band type socket |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61110532A (en) |
-
1984
- 1984-11-06 JP JP23358584A patent/JPS61110532A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61110532A (en) | 1986-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4743422A (en) | Method for manufacturing a sealing body for a pipe joint | |
| US4984831A (en) | Pipe socket and a method of forming a pipe socket | |
| JPH08108462A (en) | Production of thermoplastic resin pipe | |
| JPH0442975B2 (en) | ||
| JPH051709Y2 (en) | ||
| JPS6222780B2 (en) | ||
| JP2718886B2 (en) | Tube expansion method of annular extruded profile | |
| JPS60107322A (en) | Molding method of socket | |
| KR950003785A (en) | Molded plastic tanks having connecting pipes suitable for heat exchangers and methods of forming such tanks | |
| JPS6250120A (en) | Preparation of thermoplastic shrink tube | |
| JPH09314660A (en) | Manufacture of pipe joint | |
| JP2789568B2 (en) | Manufacturing method of electrofusion joint | |
| JPS6347448Y2 (en) | ||
| JPH0268285A (en) | Manufacture of handle grip made of urethane foam | |
| JPS58114912A (en) | Manufacture of branch pipe for sewerage | |
| JP2649067B2 (en) | Manufacturing method of sealing device | |
| JPS6235899B2 (en) | ||
| JPS5945492B2 (en) | Socket molding method for thermoplastic resin pipe | |
| JP3785073B2 (en) | Mold and method for producing elastic roll using the same | |
| JPS58364B2 (en) | plastic material | |
| JPS62211126A (en) | Molding of rubber ring type socket | |
| JPH0567411B2 (en) | ||
| JPH08300476A (en) | Structure of receiving mouth of crystalline synthetic resin pipe and processing thereof | |
| JPH08142186A (en) | Reception port-forming method for crystalline resin tube | |
| JPS6029620B2 (en) | Method for forming a groove for engaging a stopper ring on the inner peripheral surface of a socket of a thermoplastic resin pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |