JPS6235900B2 - - Google Patents
Info
- Publication number
- JPS6235900B2 JPS6235900B2 JP54022222A JP2222279A JPS6235900B2 JP S6235900 B2 JPS6235900 B2 JP S6235900B2 JP 54022222 A JP54022222 A JP 54022222A JP 2222279 A JP2222279 A JP 2222279A JP S6235900 B2 JPS6235900 B2 JP S6235900B2
- Authority
- JP
- Japan
- Prior art keywords
- socket
- pipe
- diameter
- plastic pipe
- plastic
- 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 14
- 230000008719 thickening Effects 0.000 description 10
- 238000000465 moulding Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000010438 heat treatment Methods 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
- B29C57/045—Belling or enlarging, e.g. combined with forming a groove using mechanical means rotating
-
- 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
-
- 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
-
- 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
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/0003—Moulding articles between moving mould surfaces, e.g. turning surfaces
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Description
【発明の詳細な説明】
本発明はプラスチツクパイプの受口成形方法に
関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for molding a plastic pipe socket.
プラスチツクパイプ端部の受口は、拡径により
成形されるが、拡径に伴う受口管壁の薄肉化が発
生し、管内水圧等に対して問題となる。 The socket at the end of a plastic pipe is formed by expanding the diameter, but as the diameter increases, the wall of the socket pipe becomes thinner, which poses a problem for water pressure inside the pipe.
このため、プラスチツクパイプ端部を予め増肉
し、この増肉端部を受口に拡径成形することが知
られている。 For this reason, it is known to increase the thickness of the end of a plastic pipe in advance and to form the increased diameter end into a socket.
しかしながら、プラスチツクパイプ端部の予備
増肉は、拡径成形を困難にするから、予備増肉量
には限度がある。特に、拡径率の大なる受口の成
形においては、予備増肉にのみ頼る場合、その増
肉量を相当に大とする必要があるから、問題が大
きい。 However, there is a limit to the amount of preliminary thickening because the preliminary thickening of the end of the plastic pipe makes diameter expansion forming difficult. In particular, when molding a socket with a large diameter expansion ratio, relying only on preliminary thickening requires a considerably large amount of thickening, which poses a serious problem.
第１図は本出願人が既に提案したプラスチツク
パイプの受口を示し、ゴムリング溝１′と受口奥
端傾斜部２′との間が逆傾斜面３′とされ、かつ、
全体の拡径度が通常の受口に較べて相当に大きく
されている。 FIG. 1 shows a plastic pipe socket already proposed by the present applicant, in which a reverse slope 3' is formed between the rubber ring groove 1' and the sloped part 2' at the rear end of the socket, and
The overall diameter expansion is considerably larger than that of a normal socket.
この受口においては、点線で示すパイプ挿口を
大なる振り角度で回動させ得、パイプ接合部の可
撓性を向上できる。従つて、地震、地盤沈下等に
対して有利である。しかしながら、全体の拡径率
が大であり、受口薄肉化を防止すべく、パイプ端
部の予備増肉量を大とすれば、上記した通り、受
口成形が困難となつて、受口成形上問題がある。 In this socket, the pipe socket shown by the dotted line can be rotated through a large swing angle, and the flexibility of the pipe joint can be improved. Therefore, it is advantageous against earthquakes, ground subsidence, etc. However, the overall diameter expansion rate is large, and if the amount of preliminary thickening at the end of the pipe is increased to prevent the socket from becoming thinner, as described above, the socket will become difficult to form. There is a problem with molding.
本発明は、受口部分を周方向に延伸処理するこ
とにより、受口の周方向引張り強度を増大し、
かゝる面からも受口の管内水圧強度を向上させ、
上記した、パイプ端部の予備増肉量の減少を可能
にするものである。従つて、第１図に示すよう
な、拡径率の大なる受口でも、容易に成形可能と
なる。 The present invention increases the circumferential tensile strength of the socket by stretching the socket in the circumferential direction,
From this perspective, the water pressure strength inside the pipe of the socket is improved,
This makes it possible to reduce the amount of preliminary thickening at the end of the pipe as described above. Therefore, even a socket having a large diameter expansion ratio as shown in FIG. 1 can be easily molded.
本発明に係るプラスチツクパイプの受口成形方
法は、上述の点に鑑みて発明された方法であり、
プラスチツクパイプの端部を拡径し、該拡径部外
面を、パイプ周方向に移動するロールで延伸処理
することを特徴とする方法である。 The plastic pipe socket forming method according to the present invention is a method invented in view of the above points,
This method is characterized by expanding the diameter of the end of a plastic pipe and stretching the outer surface of the expanded diameter part with rolls that move in the circumferential direction of the pipe.
以下、図面により本発明を説明する。 The present invention will be explained below with reference to the drawings.
第２図は、プラスチツクパイプの端部Ｅを示し
増肉されている。 FIG. 2 shows the end E of the plastic pipe, which has been thickened.
この増肉については、プラスチツクパイプの押
出時、パイプ引取り速度を周期的に減速するか、
或いは、プラスチツク押出量を周期的に増量し
て、一定間隔ごとに増肉部を有するパイプを押出
し、この押出しに連動して、パイプを一端に増肉
部を有するように定尺する等の公知の方法を用い
ることができる。 Regarding this thickening, when extruding the plastic pipe, the pipe take-up speed should be periodically slowed down, or
Alternatively, there is a known method in which the amount of plastic extrusion is increased periodically to extrude a pipe having thickened portions at regular intervals, and in conjunction with this extrusion, the pipe is sized to have a thickened portion at one end. The following method can be used.
本発明を実施するには、パイプ端部を加熱し、
この加熱端部を受口に拡径する。 To carry out the invention, the pipe end is heated;
This heating end is expanded into a socket.
この拡径には、第３図Ａに示すように、プラス
チツクパイプ端部Ｅを受口成形用中子Ａに圧挿す
る方法、プラスチツク端部をブロー法により拡径
する方法、或いは、第３図Ｂに示すように、漸次
的にパイプ端部Ｅの径方向に移動しつつパイプ端
部内周に沿つて移動する受口成形用ロールＢで拡
径する方法等、公知の方法を用いることができ
る。 This diameter expansion can be done by pressing the plastic pipe end E into the socket molding core A, expanding the diameter of the plastic pipe end by blowing, as shown in Figure 3A, or by a third method. As shown in Figure B, a known method can be used, such as a method of enlarging the diameter with a socket forming roll B that gradually moves in the radial direction of the pipe end E and moves along the inner circumference of the pipe end. can.
上記のように、プラスチツクパイプ端部を拡径
した後は、第４図Ａに示すように、拡径部外面に
ロールＣを密接させ、該ロールＣを第４図Ｂに示
すように拡径部の周方向に向けて移動させる。 After expanding the diameter of the end of the plastic pipe as described above, as shown in Figure 4A, roll C is brought into close contact with the outer surface of the expanded diameter part, and the roll C is expanded in diameter as shown in Figure 4B. move it in the circumferential direction of the section.
このロールの移動により、拡径部のプラスチツ
クが周方向に延伸処理されると共に受口の最終形
状に成形される。 By this movement of the rolls, the plastic in the enlarged diameter section is stretched in the circumferential direction and formed into the final shape of the socket.
上記延伸処理の際、プラスチツクパイプの拡径
部は、その弾性により、拡径率に応じた復元力を
有しており、従つてロールの延伸処理は、この復
元力を緩和する意味で行なわれる。 During the above-mentioned stretching process, the expanded diameter portion of the plastic pipe has a restoring force depending on the diameter expansion rate due to its elasticity, and therefore the roll stretching process is performed to alleviate this restoring force. .
従つて、このロールの延伸処理によるプラスチ
ツクパイプ拡径部の円周方向の周長の長大化は、
実質的に生じず、いわば結果的に延伸処理を行な
つたこととなる。 Therefore, the increase in the circumferential length of the enlarged diameter portion of the plastic pipe due to this roll stretching process is as follows:
This does not substantially occur, and as a result, a stretching process is performed.
また、ロールの延伸倍率は、実質的に当初のプ
ラスチツクパイプを拡径した際の拡径率以下とさ
れていれば拡径部分のロール延伸による周長長大
化は生じない。 Furthermore, if the stretching ratio of the rolls is substantially equal to or lower than the diameter expansion ratio at which the original plastic pipe is expanded, the circumferential length of the enlarged diameter portion will not increase due to roll stretching.
上記の延伸処理により受口の周方向引張り強度
が増大される結果、拡径受口の管壁厚さをパイプ
管壁厚さとほゞ同厚にする程度でも、受口径増大
による受口の管内水圧に対してのフープストレス
に充分、対処できる。従つて、パイプ端部の予備
増肉量をそれだけ小さくできる。 As a result of the above-mentioned stretching treatment increasing the tensile strength in the circumferential direction of the socket, even if the pipe wall thickness of the enlarged diameter socket is made approximately the same as the pipe wall thickness, the inside of the pipe of the socket due to the increase in the socket diameter Can adequately handle hoop stress due to water pressure. Therefore, the amount of preliminary thickening at the end of the pipe can be reduced accordingly.
上述した通り、本発明によれば、パイプ端部の
予備増肉量を小にしても、管内水圧強度に秀れた
受口を成形でき、拡径率の大なる受口であつて
も、上記予備増肉量の減少により、容易に拡径成
形できる。 As described above, according to the present invention, even if the amount of preliminary thickening at the end of the pipe is small, a socket with excellent internal water pressure strength can be formed, and even if the socket has a large diameter expansion ratio, By reducing the amount of preliminary thickening described above, diameter expansion molding can be easily performed.
第１図はプラスチツクパイプの受口を示す説明
図、第２図は本発明により受口が成形されるプラ
スチツクパイプ端部を示す説明図、第３図Ａ並び
に第３図Ｂは本発明におけるパイプ端部の拡径段
階を示す説明図、第４図Ａは本発明における受口
外面のロールによる処理段階を示す縦断説明図、
第４図Ｂは第４図ＡにおけるＢ−Ｂ断面説明図で
ある。
図において、Ｅはプラスチツクパイプの端部、
Ｃはロールである。
FIG. 1 is an explanatory diagram showing a socket of a plastic pipe, FIG. 2 is an explanatory diagram showing an end of a plastic pipe into which a socket is formed according to the present invention, and FIGS. 3A and 3B are pipes according to the present invention. An explanatory view showing the step of expanding the diameter of the end portion; FIG. 4A is a longitudinal cross-sectional view showing the step of treating the outer surface of the socket with a roll in the present invention;
FIG. 4B is an explanatory cross-sectional view taken along line BB in FIG. 4A. In the figure, E is the end of the plastic pipe,
C is a roll.
Claims (1)
部外面を、パイプ周方向に移動するロールで延伸
処理することを特徴とするプラスチツクパイプの
受口成形方法。1. A method for forming a socket for a plastic pipe, which comprises expanding the diameter of the end of the plastic pipe, and stretching the outer surface of the expanded diameter part using rolls that move in the circumferential direction of the pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2222279A JPS55113518A (en) | 1979-02-26 | 1979-02-26 | Forming plastic pipe socket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2222279A JPS55113518A (en) | 1979-02-26 | 1979-02-26 | Forming plastic pipe socket |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55113518A JPS55113518A (en) | 1980-09-02 |
| JPS6235900B2 true JPS6235900B2 (en) | 1987-08-04 |
Family
ID=12076764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2222279A Granted JPS55113518A (en) | 1979-02-26 | 1979-02-26 | Forming plastic pipe socket |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55113518A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51136076A (en) * | 1975-04-19 | 1976-11-25 | Dual Gebrueder Steidinger | Driving device having belt and joggled belt pully |
| JPS5289177A (en) * | 1976-01-21 | 1977-07-26 | Hitachi Ltd | Method of grooving inner surface of pipe material |
-
1979
- 1979-02-26 JP JP2222279A patent/JPS55113518A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51136076A (en) * | 1975-04-19 | 1976-11-25 | Dual Gebrueder Steidinger | Driving device having belt and joggled belt pully |
| JPS5289177A (en) * | 1976-01-21 | 1977-07-26 | Hitachi Ltd | Method of grooving inner surface of pipe material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55113518A (en) | 1980-09-02 |
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