JPH0333497B2 - - Google Patents
Info
- Publication number
- JPH0333497B2 JPH0333497B2 JP27226389A JP27226389A JPH0333497B2 JP H0333497 B2 JPH0333497 B2 JP H0333497B2 JP 27226389 A JP27226389 A JP 27226389A JP 27226389 A JP27226389 A JP 27226389A JP H0333497 B2 JPH0333497 B2 JP H0333497B2
- Authority
- JP
- Japan
- Prior art keywords
- insert
- resin
- slide core
- pipe joint
- inner circumferential
- 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
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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14311—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles using means for bonding the coating to the articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0097—Glues or adhesives, e.g. hot melts or thermofusible adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2715/00—Condition, form or state of preformed parts, e.g. inserts
- B29K2715/006—Glues or adhesives, e.g. hot melts or thermofusible adhesives
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は樹脂層が金属製管継手本体の略中央部
内周面に設けられた防食管継手の製造方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a corrosion-resistant pipe joint in which a resin layer is provided on the inner circumferential surface of a substantially central portion of a metal pipe joint body.
（従来の技術）
従来、防食管継手としては、例えば、実公昭40
−15735号公報に記載（第４図参照）の如く、糊
着剤２′を塗布せる中央部が膨出し両端部が延在
した防食可塑質の筒状薄肉接続体１′の膨出部を
継手４′内部に挿入の上、上記接続体１′の両端部
を接続すべき内面防食を施したねじ込み管３′，
３′の各開口部に挿入するようにしたものが提案
されている。(Prior art) Conventionally, as anti-corrosion pipe fittings, for example,
As described in Publication No. 15735 (see Figure 4), the bulging part of the cylindrical thin-walled connecting body 1' made of anti-corrosion plastic, which has a bulging center part to which the glue 2' is applied and extending both ends. A threaded pipe 3' with internal corrosion protection is inserted into the joint 4' and connects both ends of the connecting body 1'.
3' has been proposed.
（発明が解決しようとする問題点）
しかし、叙上の如き従来のものは、別途成形し
た筒状薄肉接続体１′を糊着剤２′を介して継手
４′の内部に接着するものであるので、製造が手
作業にならざるを得ず、作業が煩雑であり、しか
もその接着に作業者の個人差が現われ、一定品質
のものを多量に製造することが困難であるという
欠点があつた。(Problems to be Solved by the Invention) However, in the conventional method as described above, a separately formed cylindrical thin-walled connecting body 1' is adhered to the inside of the joint 4' via an adhesive 2'. Because of this, manufacturing has to be done by hand, which is complicated, and there are individual differences in the adhesion between workers, making it difficult to manufacture large quantities of products of constant quality. Ta.
本発明は、叙上の如き従来の欠点を解消するこ
とを目的としてなされたものである。 The present invention has been made with the object of eliminating the conventional drawbacks as described above.
（問題点を解決するための手段）
上述した目的を達成するために、本発明の防食
管継手の製造方法は、略中央部内周面に凹部を有
し、両端部近傍内周面に雌ねじ部を有する金属製
管継手本体の該雌ねじ部に筒状のインサートをそ
れぞれ螺合し、該インサートの内部に柱状のスラ
イドコアーを挿着する工程と、前記凹部と前記ス
ライドコアーで形成される環状空所内に、該スラ
イドコアーと前記インサートで形成される樹脂流
路を通して射出成型により樹脂を射出する工程
と、射出された樹脂が冷却固化した後、前記スラ
イドコアー及び前記インサートを前記金属製管継
手本体から離脱させる工程とからなり、前記凹部
に樹脂ライニング層を固着させることを特徴とし
ている。(Means for Solving the Problems) In order to achieve the above-mentioned object, the method for manufacturing a corrosion-resistant pipe joint of the present invention has a concave portion on the inner circumferential surface of the substantially central portion, and a female screw portion on the inner circumferential surface near both ends. a step of screwing cylindrical inserts into the female threaded portions of a metal pipe joint body having A process of injecting resin by injection molding through a resin channel formed by the slide core and the insert, and after the injected resin is cooled and solidified, the slide core and the insert are inserted into the metal pipe joint body. The resin lining layer is fixed to the recessed portion.
（実施例）
以下、本発明を実施例により図面を参照して説
明する。(Example) Hereinafter, the present invention will be described by way of an example with reference to the drawings.
第１図は本発明の防食管継手の製造方法の一実
施例を説明するための断面図である。 FIG. 1 is a sectional view for explaining one embodiment of the method for manufacturing a corrosion-resistant pipe joint of the present invention.
１はソケツト型の金属製管継手本体であつて、
両開口端部１１，１２の内周面に雌ねじ部１１
１，１２１が設けられ、その奥部内周面、つまり
管継手本体１の略中央部内周面に凹部１３が設け
られている。（第２図も参照）
この本体１の一開口端部１１に筒状のインサー
ト２を螺合し、その開口端面にインサート２の鍔
部２３の内側面を当接する。インサート２の筒部
２１内に、スライドコアー３を柱部３１が筒部２
１内周面と各部で所定間〓３３を形成し、その先
端が筒部２１よりも突出する如く挿着する。 1 is a socket-type metal pipe joint body,
A female threaded portion 11 is provided on the inner peripheral surface of both open ends 11 and 12.
1 and 121, and a recess 13 is provided on the inner circumferential surface of the deep part thereof, that is, on the inner circumferential surface of the substantially central part of the pipe joint body 1. (See also FIG. 2) A cylindrical insert 2 is screwed into one open end 11 of the main body 1, and the inner surface of the collar 23 of the insert 2 is brought into contact with the open end surface. The slide core 3 is inserted into the cylindrical part 21 of the insert 2 so that the column part 31 is inserted into the cylindrical part 2.
A predetermined distance 33 is formed between the inner circumferential surface of the tube 1 and each portion, and the tube is inserted so that its tip protrudes beyond the cylindrical portion 21.
本体１の他開口端部１２に閉塞具４のインサー
ト閉塞具４１を螺合してその開口端部を閉塞す
る。また閉塞具４のスライドコアー閉塞具４２の
柱部４２１の先端面にスライドコアー３の柱部３
１の先端面を当接する。そして、本体１の略中央
部内周面のホツトメルト接着剤を塗布した凹部１
３とインサート２の筒部２１の先端面と、スライ
ドコアー３の柱部３１の先端面と、閉塞具４とで
囲まれた環状空所中へ、スライドコアー３とイン
サート２で形成される樹脂流路、すなわち案内溝
３２２、凹溝３２１、環状間〓３３により構成さ
れる樹脂流路を通して射出成型により樹脂を射出
する。この時、金属製管継手本体と射出される樹
脂との接着性を増大するために、凹部１３に事前
に表面処理を施しておくことが好ましい。この表
面処理として、本実施例ではホツトメルト接着剤
層１４を設けている。この場合、射出された樹脂
の熱により、本体１の略中央部内周面の凹部１３
上に塗布したホツトメルト接着剤が溶融して、本
体１の略中央部内周面の凹部１３上にホツトメル
ト接着剤層１４を介して樹脂ライニング層１５が
強固に接着されることになる。 The insert obturator 41 of the obturator 4 is screwed into the other open end 12 of the main body 1 to close the open end. In addition, the column portion 3 of the slide core 3 is attached to the distal end surface of the column portion 421 of the slide core obturator 42 of the obturator 4.
Abut the tip of No. 1. Then, a recess 1 coated with hot melt adhesive is formed on the inner circumferential surface of the main body 1 at approximately the center.
3, the distal end surface of the cylindrical portion 21 of the insert 2, the distal end surface of the columnar portion 31 of the slide core 3, and the obturator 4, into which the resin formed by the slide core 3 and the insert 2 is inserted. The resin is injected by injection molding through a flow path, that is, a resin flow path constituted by a guide groove 322, a groove 321, and an annular gap 33. At this time, in order to increase the adhesiveness between the metal pipe joint body and the injected resin, it is preferable to perform a surface treatment on the recess 13 in advance. As this surface treatment, a hot melt adhesive layer 14 is provided in this embodiment. In this case, the heat of the injected resin causes the concave portion 13 on the inner circumferential surface of the approximately central portion of the main body 1 to
The hot melt adhesive applied thereon melts, and the resin lining layer 15 is firmly adhered to the recess 13 on the inner peripheral surface of the main body 1 through the hot melt adhesive layer 14.
凹部１３の表面処理としては、上記の他、プラ
イマー処理であつてもよく、また、樹脂のアンカ
ー効果を高めるためのブラスト処理による微細凹
凸の付与であつてもよい。 In addition to the above, the surface treatment of the recessed portion 13 may be a primer treatment, or may be a blast treatment to provide fine irregularities in order to enhance the anchoring effect of the resin.
樹脂ライニング層が冷却固化した後、インサー
ト２及びインサート閉塞具４１からそれぞれスラ
イドコアー３及びスライドコアー閉塞具４２を離
脱させ、前記樹脂流路に充填されたランナー部を
切断し、前記インサート２及びインサート閉塞具
４１を回転させてそれぞれ前記雌ねじ部１１１，
１２１から離脱させる。こうして製造された防食
管継手は第２図に示すように、金属製管継手本体
１の略中央部内周面の凹部１３にのみ樹脂ライニ
ング層１５が固着されたものとなる。 After the resin lining layer is cooled and solidified, the slide core 3 and the slide core obturator 42 are removed from the insert 2 and the insert obturator 41, respectively, the runner portion filled in the resin flow path is cut, and the insert 2 and the insert obturator 41 are removed. By rotating the obturator 41, the female threaded portions 111,
Remove from 121. As shown in FIG. 2, the corrosion-resistant pipe joint manufactured in this way has a resin lining layer 15 fixed only to the recess 13 on the inner circumferential surface of the metal pipe joint main body 1 in the substantially central part.
本発明で製造される防食管継手は第２図に図示
したものに限定されることはなく、第３図に図示
するように、樹脂ライニング層１５から筒状体１
５１，１５１が開口端部１１，１２に向かつて延
設された構造のものも製造することができる。こ
の場合、前記実施例の環状間〓３３が筒状体１５
１の肉厚に対応するように、筒状のインサート２
の内径を大きくするとともに、インサート閉塞具
４１とスライドコアー閉塞具４２との間に、凹部
１３とインサート２の先端面と閉塞具４とで囲ま
れた環状空所に連続する所定寸法の環状間〓を設
けることが必要である。 The anti-corrosion pipe joint manufactured according to the present invention is not limited to that shown in FIG. 2, and as shown in FIG.
It is also possible to manufacture a structure in which the openings 51 and 151 extend toward the open ends 11 and 12. In this case, the annular space 33 of the above embodiment is replaced by the cylindrical body 15.
The cylindrical insert 2 corresponds to the wall thickness of 1.
In addition, an annular gap of a predetermined size is formed between the insert obturator 41 and the slide core obturator 42, which is continuous with the annular space surrounded by the recess 13, the distal end surface of the insert 2, and the obturator 4. It is necessary to provide 〓.
（発明の効果）
叙上の如く、本発明の防食管継手の製造方法
は、略中央部内周面に凹部を有し、両端部近傍内
周面に雌ねじ部を有する金属製管継手本体の該雌
ねじ部に筒状のインサートをそれぞれ螺合し、該
インサートの内部に柱状のスライドコアーを挿着
する工程と、前記凹部と前記スライドコアーで形
成される環状空所内に、該スライドコアーと前記
インサートで形成される樹脂流路を通して射出成
型により樹脂を射出する工程と、射出された樹脂
が冷却固化した後、前記スライドコアー及び前記
インサートを前記金属製管継手本体から離脱させ
る工程とからなり、前記凹部に樹脂ライニング層
を固着させるものであるので、射出された樹脂は
インサートの存在により雌ねじ部に付着すること
がなく、従がつて、ライニング鋼管を螺入接続し
て通水する際に露出される本体の略中央部内周面
の凹部のみに確実に樹脂ライニング層を固着させ
ることができる。(Effects of the Invention) As described above, the method for manufacturing a corrosion-resistant pipe joint of the present invention is applicable to a metal pipe joint main body that has a recess on the inner circumferential surface of the substantially central portion and female threads on the inner circumferential surface near both ends. Screwing cylindrical inserts into the female threaded portions, inserting a columnar slide core inside the inserts, and inserting the slide cores and the insert into an annular space formed by the recess and the slide core. the step of injecting the resin by injection molding through the resin channel formed by the step of forming the resin, and the step of separating the slide core and the insert from the metal pipe joint body after the injected resin is cooled and solidified; Since the resin lining layer is fixed to the recess, the injected resin does not adhere to the female thread due to the presence of the insert, and is therefore exposed when the lining steel pipe is screwed and water is passed through. The resin lining layer can be reliably fixed only to the recessed portion of the inner circumferential surface of the main body at the approximately central portion thereof.
第１図は本発明防食管継手の製造方法の一実施
例を説明するための断面図、第２図は本発明で製
造された防食管継手の一例を示す断面図、第３図
は本発明で製造された防食管継手の別の例を示す
断面図、第４図は従来のものを説明するための断
面図である。
（符号の説明）、１……金属製管継手本体、１
１１……雌ねじ部、１３……凹部、１５……樹脂
ライニング層、２……インサート、３……スライ
ドコアー。
FIG. 1 is a cross-sectional view for explaining an example of the method for manufacturing a corrosion-resistant pipe joint according to the present invention, FIG. 2 is a cross-sectional view showing an example of a corrosion-resistant pipe joint manufactured according to the present invention, and FIG. 3 is a cross-sectional view showing an example of the method for manufacturing a corrosion-resistant pipe joint according to the present invention. FIG. 4 is a cross-sectional view showing another example of a corrosion-resistant pipe joint manufactured by the conventional method. (Explanation of symbols), 1...Metal pipe joint body, 1
DESCRIPTION OF SYMBOLS 11... Female thread part, 13... Recessed part, 15... Resin lining layer, 2... Insert, 3... Slide core.
Claims (1)
周面に雌ねじ部を有する金属製管継手本体の該雌
ねじ部に筒状のインサートをそれぞれ螺合し、該
インサートの内部に柱状のスライドコアーを挿着
する工程と、 前記凹部と前記スライドコアーで形成される環
状空所内に、該スライドコアーと前記インサート
で形成される樹脂流路を通して射出成型により樹
脂を射出する工程と、 射出された樹脂が冷却固化した後、前記スライ
ドコアー及び前記インサートを前記金属製管継手
本体から離脱させる工程とからなり、 前記凹部に樹脂ライニング層を固着させること
を特徴とする防食管継手の製造方法。[Scope of Claims] 1. A metal pipe joint body having a recessed portion on the inner circumferential surface at approximately the center and female threaded portions on the inner circumferential surface near both ends. A step of inserting a columnar slide core inside the insert, and injecting resin by injection molding into an annular cavity formed by the recess and the slide core through a resin channel formed by the slide core and the insert. and a step of separating the slide core and the insert from the metal pipe joint body after the injected resin is cooled and solidified, and fixing a resin lining layer to the recess. Manufacturing method for food pipe fittings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27226389A JPH0342220A (en) | 1989-10-18 | 1989-10-18 | Preparation of corrosion-resistant pipe joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27226389A JPH0342220A (en) | 1989-10-18 | 1989-10-18 | Preparation of corrosion-resistant pipe joint |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7394381A Division JPS57190190A (en) | 1981-05-15 | 1981-05-15 | Corrosion-proof pipe joint and its manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0342220A JPH0342220A (en) | 1991-02-22 |
| JPH0333497B2 true JPH0333497B2 (en) | 1991-05-17 |
Family
ID=17511411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27226389A Granted JPH0342220A (en) | 1989-10-18 | 1989-10-18 | Preparation of corrosion-resistant pipe joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0342220A (en) |
-
1989
- 1989-10-18 JP JP27226389A patent/JPH0342220A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0342220A (en) | 1991-02-22 |
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