JPS58167118A - Manufacture of metal tube having resin covered inner face and plated outer face - Google Patents
Manufacture of metal tube having resin covered inner face and plated outer faceInfo
- Publication number
- JPS58167118A JPS58167118A JP5244082A JP5244082A JPS58167118A JP S58167118 A JPS58167118 A JP S58167118A JP 5244082 A JP5244082 A JP 5244082A JP 5244082 A JP5244082 A JP 5244082A JP S58167118 A JPS58167118 A JP S58167118A
- Authority
- JP
- Japan
- Prior art keywords
- metal tube
- tube
- resin
- die
- plated
- 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.)
- Pending
Links
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、内面を塩化ビニル等の樹脂にて被覆し、外面
を亜鉛等の金属メッキにて被覆した金属管の製造方法に
関する。このような金属管は、主として土中、コンクリ
ート中に埋設σれる水道管に使用でれる。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a metal tube whose inner surface is coated with a resin such as vinyl chloride and whose outer surface is coated with metal plating such as zinc. Such metal pipes are mainly used for water pipes buried in soil or concrete.
水道管に金属管を使用する場合、金属管の腐食に伴う汚
染から水道水を保護するため、金属管の内面に樹脂被覆
を行うのが通例となっている。この場合、樹脂被覆の手
段としては、粉体ライニングより信頼性が高いといわれ
ているFjJ脂チューブの挿入が一般的である。When metal pipes are used as water pipes, it is customary to coat the inner surface of the metal pipes with a resin in order to protect the tap water from contamination due to corrosion of the metal pipes. In this case, as a means of resin coating, insertion of an FJJ resin tube is generally used, which is said to be more reliable than powder lining.
一方、金属製の水道管をコンクリート中に埋設する場合
、コンクリートの残留水分による腐食から水道管を保護
するために、水道管の外面に亜鉛等の高耐食性金属をメ
ッキすることが好ましいとされている。また、土中に埋
設する場合にあっても、水道管の外面メッキは工事によ
る外傷から管表面を保護する上で有効である。On the other hand, when metal water pipes are buried in concrete, it is recommended that the outer surface of the water pipes be plated with a highly corrosion-resistant metal such as zinc in order to protect the water pipes from corrosion due to residual moisture in the concrete. There is. Furthermore, even when the water pipe is buried in the ground, plating the outer surface of the water pipe is effective in protecting the pipe surface from damage caused by construction work.
このようなことから、コンクリート中に埋設される水道
管としては、内面を樹脂被覆し外面を金属メッキした金
属管(以下、内面樹脂被覆・外面メッキ金属管という)
が多く使用でれ、土中に埋設でれる水道管としてもその
需要が高まっている。For this reason, water pipes buried in concrete are metal pipes whose inner surfaces are coated with resin and whose outer surfaces are plated with metal (hereinafter referred to as inner resin-coated/outer plated metal pipes).
are widely used, and demand is increasing for water pipes that can be buried underground.
内面樹脂被覆・外面メッキ金属管を製造する場合、注意
しなければならないことは、内面を樹脂被覆した後で夕
)面にメッキを施すと、メッキの段階で樹脂が熱度質等
を起すので、樹脂被覆に先だってメッキを行っておかな
ければならないことである。When manufacturing metal tubes with resin coating on the inner surface and plating on the outer surface, it is important to be careful when plating the surface after coating the inner surface with resin. Plating must be performed prior to resin coating.
外面を金属メッキした金属管(以下、外面メッキ金属管
という)の中に接着剤を介して樹脂チューブを挿入した
後、この管をダイスによる引抜き加工により縮径して、
前記外面メッキ金属管の内面に樹脂チューブを接着させ
る方法はその1つであるが、外面メッキ金属管のメッキ
層がダイスによって強く擦られ、折角のメッキ層を剥離
させる欠点がある。After inserting a resin tube through adhesive into a metal tube whose outer surface is metal plated (hereinafter referred to as outer surface plated metal tube), the diameter of this tube is reduced by drawing with a die.
One such method is to adhere a resin tube to the inner surface of the externally plated metal tube, but it has the disadvantage that the plating layer of the externally plated metal tube is strongly rubbed by a die, causing the plating layer to peel off.
本発明の目的は、この欠点を解消した内面樹脂被覆・外
面メッキ金属管の製造方法を提供することにある。An object of the present invention is to provide a method for manufacturing a metal tube with an inner surface coated with resin and an outer surface plated, which eliminates this drawback.
ところで、従来からダイスによる引抜き縮径加工を使用
した内面樹脂被覆・外面メッキ金属管の製造においては
、メッキ層を考慮せず、一般の引抜き縮径加工に準じた
アプローチ角度が25度前後のダイスを使用していた。By the way, in the production of metal tubes with inner resin coating and outer surface plating using conventional pultrusion diameter reduction processing using dies, a die with an approach angle of around 25 degrees, which is similar to general pultrusion diameter reduction processing, is used without considering the plating layer. was using.
而して、引抜き加工、、ト
により生じるメッキ層の剥離は、メッキの段階で金属管
との間に生じる合金N(znメッキの場合Fe−Zn合
金層)の延性が低いために、合金層が引抜き時に管軸方
向へ破断することが原因である。外面メッキ金属管の縮
径率を小さくすればこの破断を防止することができるか
もしれないが、縮径率を小きくすることは樹脂チューブ
の接M強度の低下を意味し、好ましくない。The peeling of the plated layer caused by the drawing process is due to the low ductility of the alloy N (Fe-Zn alloy layer in the case of ZN plating) that occurs between the metal tube and the metal tube during the plating process. The cause is that the tube breaks in the axial direction when it is pulled out. It may be possible to prevent this breakage by reducing the diameter reduction ratio of the outer plated metal tube, but reducing the diameter reduction ratio means a decrease in the contact M strength of the resin tube, which is not preferable.
本発明者らは、外面メッキ金属管の縮径率を小さくする
ことなくメッキ層の剥離を防止するためには、合金層の
管軸方向の伸びのみを抑制できるダイス穴形状を見つけ
るのが得策であると考え、金属管に引抜き加工を施した
場合の、ダイス穴のアプローチ角度と、金属管の管軸方
向の伸びとの関係を調査研究した。その結果、アプロー
チ角度が従来使用でれているものよりも小さい15度以
下のときに金属管の管軸方向の伸びが抑制され、外面メ
ッキ金属管にあっては合金層の伸びを抑え、メッキ層の
剥離が防止できることを知見した。The present inventors found that in order to prevent peeling of the plating layer without reducing the diameter reduction ratio of the externally plated metal tube, it is a good idea to find a die hole shape that can suppress only the elongation of the alloy layer in the tube axis direction. Considering this, we investigated the relationship between the approach angle of the die hole and the elongation of the metal tube in the tube axis direction when drawing the metal tube. As a result, when the approach angle is 15 degrees or less, which is smaller than conventionally used ones, the elongation of the metal tube in the tube axis direction is suppressed, and in the case of externally plated metal tubes, the elongation of the alloy layer is suppressed, and the plated It has been found that peeling of the layers can be prevented.
本発明は、この知見に基づきなされたもので、接着剤を
介して樹脂チ□ューブを内挿した外面メッキ金属管を、
アプローチ角度が15度以下のテーバ型ダイスもしくは
これに相当するアール型ダイスによる引抜き加工により
縮径して、前記外面メッキ金属管の内面に前記樹脂チュ
ーブを接着させることを特徴とする内面樹脂被覆・外面
メ゛ツキ金属管の製造方法を要旨とする。The present invention was made based on this knowledge, and includes an outer plated metal tube with a resin tube inserted through an adhesive.
An inner resin coating characterized in that the resin tube is bonded to the inner surface of the outer plated metal tube by reducing the diameter by drawing with a Taber type die having an approach angle of 15 degrees or less or an equivalent R type die. The gist of this article is a method for manufacturing a metal tube with a plated outer surface.
以下、本発明の方法を図面を参照して更に詳しく説明す
る。Hereinafter, the method of the present invention will be explained in more detail with reference to the drawings.
先ず、外面メッキ金属管を用意する。First, prepare an externally plated metal tube.
金属管の材質は鋼が一般的である力i、これに限定する
ものではない。The material of the metal tube is generally steel, but is not limited to this.
メッキ金属についても亜鉛が一般的である9玉。Zinc is also the most common plated metal.
これに限るものではない。It is not limited to this.
外面メッキ金属管が用意されると、その内面または挿入
しようとする樹脂チューン゛の外面もしくはその双方に
接着剤を添付する。Once the externally plated metal tube is prepared, adhesive is applied to its inner surface and/or the outer surface of the resin tuner to be inserted.
接着剤としては例えばコ゛ム系水性接着斉1.混合系溶
媒揮散型接着剤等かある。Examples of adhesives include comb-based water-based adhesives. There are mixed solvent volatile adhesives, etc.
接着剤の添付が終ると、外面メ・フキ金属管の内部に樹
脂チューブを挿入する。After applying the adhesive, insert the resin tube inside the outer metal pipe.
樹脂チューブの外径は、外面メ゛ンキ金属管への内挿を
阻害しもい範囲内で可及的に大きくとっておくことが必
要である。樹脂チューブを内挿した段階で樹脂チューブ
と外面メ・ツキ金属管との…jにすき間がありすぎると
、次の引抜き加工の段階で両者の密着強度が不足する危
険を生じる。The outer diameter of the resin tube needs to be as large as possible within a range that does not hinder its insertion into the externally cast metal tube. If there is too much gap between the resin tube and the externally plated metal tube when the resin tube is inserted, there is a risk that the adhesion strength between the two will be insufficient during the next drawing process.
他の寸法諸元については、製造しようとする内面樹脂被
覆・外面メ゛ンキ金属管の寸法諸元に基づいて決めれば
よい。Other dimensions may be determined based on the dimensions of the resin-coated inner surface and outer cast metal tube to be manufactured.
樹脂チューブが内挿されると、第1図に示すように、樹
脂チューブ(1)を内挿のまま外面メ゛ツキ金属管(2
)をダイス(3)による引抜き加工により縮径する。When the resin tube is inserted, as shown in Fig. 1, the outer surface plated metal tube (2) is inserted with the resin tube (1) inserted.
) is reduced in diameter by drawing with a die (3).
ダイス(3)が図に実線で示すテークく型夕゛イスの場
合、ダイス穴のアプローチ角度(ロ)(アプローチ部の
開き角度をいう)は15度以下であること力;必要であ
る。アプローチ角度に)力515度より大きいと、前述
したように外面メ・ツキ金属管(2)の管軸方向の伸び
に起因してメッキ層下部の合金層を4中長させ、その破
断によ、リメツキ層を剥離させる。アプローチ角度(ロ
)の下限については、縮径率一定でアプローチ角度轄)
を小さくしてゆくとダイス(3)の厚みが増すことから
、使用上の制約等から自ずと決まることになる。If the die (3) is a take type device shown by the solid line in the figure, it is necessary that the approach angle (b) of the die hole (referring to the opening angle of the approach part) be 15 degrees or less. If the force (at the approach angle) is larger than 515 degrees, the outer surface plated metal tube (2) will elongate in the axial direction, causing the alloy layer at the bottom of the plated layer to lengthen by 4 degrees, causing its rupture. , peel off the remecked layer. The lower limit of the approach angle (b) is determined by the approach angle at a constant diameter reduction rate)
Since the thickness of the die (3) increases as the size of the die (3) decreases, this is naturally determined by usage constraints.
ダイス(3)が図に破線で示すアール型ダイスの場合に
は、上記テーパ型ダイスのダイス穴に相当するダイス穴
をもつものとする。ここで、相当するとは両者のダイス
穴が幾何学的に類似するということではなく、両者の材
料に及ぼす彩管が実質的に同一ということであり、しい
て言うなら、テーバ型ダイスのアプローチ角度灯)と、
アール型ダイスの稼動部分(X4)(材料の縮径に直接
的に寄与する部分をいう)の平均開き角度、もしくは稼
動部分(x−y )の中間点(4における開き角度0と
を比較するのが妥当であろう。If the die (3) is a rounded die shown by the broken line in the figure, it has a die hole corresponding to the die hole of the tapered die. Here, being equivalent does not mean that the two die holes are geometrically similar, but rather that the color tubes that affect the material of both are substantially the same.In other words, the approach angle of the Taber die light) and
Compare the average opening angle of the moving part (X4) (the part that directly contributes to the diameter reduction of the material) of the R-type die, or the opening angle 0 at the midpoint (4) of the moving part (x-y). would be appropriate.
外面メッキ金属管(2)の縮径率は、小さ過ぎると樹脂
チューブ(1)と外面メッキ金属管(2)の接着強度が
不足し、逆に大き過ぎると外面メッキ金属管(2)に機
械的性質の変化をもたらすので、3〜6%の範囲内が好
適である。If the diameter reduction rate of the outer plated metal tube (2) is too small, the adhesive strength between the resin tube (1) and the outer plated metal tube (2) will be insufficient, and if it is too large, mechanical damage will occur. Since this brings about a change in physical properties, a range of 3 to 6% is preferable.
引抜き加工温度については、冷間、温間(樹脂チューブ
に悪影響を与えない範囲)のいずれでもよい。冷間で引
抜き加工を行う場合には桐滑油を要し、温間加工の場合
には潤滑油を必要としないのが通例である。The drawing temperature may be either cold or warm (within a range that does not adversely affect the resin tube). Tung lubricating oil is usually required for cold drawing, but no lubricating oil is required for warm drawing.
他の加工条件については、一般の引抜き縮径加工に準じ
て決めればよい。Other processing conditions may be determined according to general drawing diameter reduction processing.
外面メッキ金属管の引抜き加工が終ると、管先端の口付
部分と後端部分とを切除して、内面樹脂被覆・外面メッ
キ金属管とされる。When the drawing process of the externally plated metal tube is completed, the mouth portion at the tip of the tube and the rear end portion are cut off to obtain a resin-coated internally and externally plated metal tube.
次に、本発明の方法の実施効果を従来の方法の場合と比
較して説明する。Next, the implementation effects of the method of the present invention will be explained in comparison with the conventional method.
第1表に示す5種の外面亜鉛メッキ鋼管(8)〜(ト)
を、アワブロー千角度が1〜25度の各種テーパ型ダイ
スにより引抜き加工した。いずれも縮径率は5.7%、
引抜き速度は80%であった。Five types of externally galvanized steel pipes (8) to (g) shown in Table 1
was drawn using various tapered dies with a blow angle of 1 to 25 degrees. In both cases, the diameter reduction rate is 5.7%,
The drawing speed was 80%.
第 1 表
メッキ層に剥離を生じた鋼管の、引抜き本数に占める割
合を第2表にアプローチ角度別に示すが、アプローチ角
度が本発明範囲(15度以下)に規制されるとメッキ層
の剥離の危険が大巾に減少し、アプローチ角度が8度以
下の場合にはメッキ層の剥離が略々完全に防止されるこ
とがわかる。Table 1 shows the percentage of steel pipes with peeling in the plating layer, based on the number of pipes pulled out, by approach angle. It can be seen that the danger is greatly reduced and peeling of the plating layer is almost completely prevented when the approach angle is 8 degrees or less.
第 2 表
また、第2図は、外径29fi、肉厚3.Offの鋼管
(材質J工S−8GP)を、アプローチ角度が1〜25
度の各種テーバ型ダイスにより縮径率5.7%で引抜き
加工した場合の、ダイス穴のアプローチる。この図に見
るように、アプローチ角度の減少とともに鋼管の管軸方
向の伸び率が小さくなり、本発明の方法においてメッキ
層の剥4が防止される理由が、金属管の管軸方向の伸び
を規制したことによる合金層の伸び率低下にあることが
わかる。Table 2 Also, Fig. 2 shows a case where the outer diameter is 29fi and the wall thickness is 3. Off steel pipe (Material J Engineering S-8GP) with an approach angle of 1 to 25.
The approach of the die hole when drawing with various Taber type dies at a diameter reduction rate of 5.7%. As seen in this figure, as the approach angle decreases, the elongation rate of the steel pipe in the tube axis direction decreases, and the reason why peeling of the plating layer is prevented in the method of the present invention is that It can be seen that the elongation rate of the alloy layer decreased due to the regulation.
なお、本発明者らは、アール型ダイスを使用した笑験に
おいても同様の結果を得ている。Incidentally, the present inventors obtained similar results in experiments using R-type dice.
以上の説明から明らかなように、本発明は外面メッキ金
属管を引抜き加工する際のメッキ層の剥離を防止し、こ
れによって高品質の内面樹脂被覆・外面メッキ金属管を
安定に製造せしめ得る効果がある。As is clear from the above description, the present invention has the effect of preventing peeling of the plating layer during drawing of an externally plated metal tube, and thereby stably manufacturing high quality internally resin-coated and externally plated metal tubes. There is.
第1図は本発明の方法の引抜き加工段階を示す模式図、
第2図は鋼管に引抜き加工を施した場合の、ダイスのア
プローチ角度と鋼管の管軸方向の伸び率との関係を示す
グラフである。
図中、l:樹脂チューブ、2:外面メッキ金属管、3:
ダイス。FIG. 1 is a schematic diagram showing the drawing step of the method of the present invention;
FIG. 2 is a graph showing the relationship between the approach angle of the die and the elongation rate of the steel pipe in the axial direction when the steel pipe is subjected to drawing processing. In the figure, l: resin tube, 2: outer plated metal tube, 3:
dice.
Claims (1)
キ金属管を、アプローチ角度が15度以下のテーパ型ダ
イスもしくはこれに相当するアール型ダイスによる引抜
き加工により縮径して、前記外面メッキ金属管の内面に
前記樹脂チューブを接着させることを特徴とする内面樹
脂被覆・外面メッキ金属管の製造方法。(1) The diameter of an externally plated metal tube into which a resin tube is inserted via adhesive is reduced by drawing with a tapered die with an approach angle of 15 degrees or less or an equivalent rounded die, and the outer surface is plated. A method for producing a metal tube with an inner surface coated with resin and an outer surface plated, the method comprising adhering the resin tube to the inner surface of the metal tube.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5244082A JPS58167118A (en) | 1982-03-30 | 1982-03-30 | Manufacture of metal tube having resin covered inner face and plated outer face |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5244082A JPS58167118A (en) | 1982-03-30 | 1982-03-30 | Manufacture of metal tube having resin covered inner face and plated outer face |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS58167118A true JPS58167118A (en) | 1983-10-03 |
Family
ID=12914792
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5244082A Pending JPS58167118A (en) | 1982-03-30 | 1982-03-30 | Manufacture of metal tube having resin covered inner face and plated outer face |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58167118A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991009724A1 (en) * | 1989-12-21 | 1991-07-11 | Hitachi Construction Machinery Co., Ltd. | Member made of fiber-reinforced resin and production thereof |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4918968A (en) * | 1972-06-13 | 1974-02-19 |
-
1982
- 1982-03-30 JP JP5244082A patent/JPS58167118A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4918968A (en) * | 1972-06-13 | 1974-02-19 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991009724A1 (en) * | 1989-12-21 | 1991-07-11 | Hitachi Construction Machinery Co., Ltd. | Member made of fiber-reinforced resin and production thereof |
US5314553A (en) * | 1989-12-21 | 1994-05-24 | Hitachi Construction Machinery Co., Ltd. | Fiber-reinforced resin member and method of producing the same |
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