JPH1182829A - Friction welding tube fitting - Google Patents

Friction welding tube fitting

Info

Publication number
JPH1182829A
JPH1182829A JP25057897A JP25057897A JPH1182829A JP H1182829 A JPH1182829 A JP H1182829A JP 25057897 A JP25057897 A JP 25057897A JP 25057897 A JP25057897 A JP 25057897A JP H1182829 A JPH1182829 A JP H1182829A
Authority
JP
Japan
Prior art keywords
box
pin
conical surface
joint
conical
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.)
Withdrawn
Application number
JP25057897A
Other languages
Japanese (ja)
Inventor
Kazushi Maruyama
和士 丸山
Eiji Tsuru
英司 津留
Haruyuki Nagayoshi
治之 永吉
Kunihiko Okamura
邦彦 岡村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP25057897A priority Critical patent/JPH1182829A/en
Publication of JPH1182829A publication Critical patent/JPH1182829A/en
Withdrawn legal-status Critical Current

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  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Flanged Joints, Insulating Joints, And Other Joints (AREA)

Abstract

PROBLEM TO BE SOLVED: To make sealed areas metallurgically connectable by giving surface treatment only to the threaded part of the tube fitting and not coating or applying lubricant to the conical surface and the end conical surface crossing the conical surface including a pin and a box. SOLUTION: Tapered male thread 3 is machine processed on one of the ends of a tube body and a conical surface 4 and a conical recessed surface 5 crossing the comical surface 4 is machine processed on the tip of the male thread 3. A female thread 3' fitting the male thread 3 and a conical surface 4' corresponding to the male thread 3 tip shape and a conical recessed surface 5' crossing the conical surface 4' are machine processed on the box 2. In order to prevent seizure caused by tightening, the threaded part 7 of the box 2 is provided with a metal plating of Zn, Sn, Cu or the like, or a phosphate film coating, or a a special coating allowing to tighten it without lubricant by dispersing a molybdenum disulfate in the resin, but the end part of the box 2 where there is no thread is not given a surface treatment. The pin where there is no thread is also not given a surface treatment.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、主として油・ガス
輸送に用いるラインパイプ継ぎ手に適用する摩擦圧接用
管継ぎ手に関するもので、特に、メカニカル継ぎ手を採
用し、嵌合終了時に雄側外周面と雌側内周面の金属接触
部において強固な摩擦圧接が実現できる構造を付与した
摩擦圧接用管継ぎ手に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for friction welding, which is mainly applied to a line pipe joint used for oil and gas transportation. The present invention relates to a pipe joint for friction welding provided with a structure capable of realizing strong friction welding at a metal contact portion on a female inner peripheral surface.

【0002】[0002]

【従来の技術】従来、ラインパイプ継ぎ手は、管端に開
先加工を施し、現地にて突き合わせ溶接するのが常であ
るが、溶接施工に長時間を要すること、溶接による接合
部の材質劣化、また、腐食環境に適合する高合金パイプ
では母材と溶着金属との強度のミスマッチなどの問題か
ら、迅速作業が可能で接合部の材質劣化のないメカニカ
ル継ぎ手が模索されている。
2. Description of the Related Art Conventionally, a line pipe joint is usually provided with a groove at a pipe end and butt-welded on site. However, it takes a long time for welding work, and the material quality of a joint due to welding is deteriorated. Also, in the case of high alloy pipes that are suitable for corrosive environments, mechanical joints that can be quickly worked and that do not deteriorate the material of joints are being sought due to problems such as a mismatch in strength between the base metal and the weld metal.

【0003】一方、抗井から油・ガスを採取する油井管
(チュービング)には、内部流体漏洩防止のため金属接
触タイプ気密機構を具備したネジ継ぎ手が種々適用され
ている。前記継ぎ手構造をそのままラインパイプ継ぎ手
として用いることも可能であると考えられるが、シール
を機械的押しつけに依存する構造のままでは、内部流体
が漏洩した場合には直ちに環境汚染に繋がるラインパイ
プには採用できないという問題がある。
[0003] On the other hand, various types of screw joints having a metal contact type airtight mechanism for preventing leakage of internal fluid are applied to oil country tubular goods (tubing) for collecting oil and gas from wells. It is considered possible to use the joint structure as it is as a line pipe joint, but if the seal remains mechanically pressed, if the internal fluid leaks, the line pipe immediately leads to environmental pollution. There is a problem that cannot be adopted.

【0004】[0004]

【発明が解決しようとする課題】本発明は、上記問題を
解決し、ネジ継ぎ手の迅速作業性を維持しながら、シー
ル部には金属接触機構ではなく、冶金的接合を可能にす
るラインパイプおよび油井管等の継ぎ手を提供すること
を目的とするものである。
SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and provides a line pipe and a metallurgical joint, not a metal contact mechanism, at the seal portion while maintaining the quick workability of the screw joint. It is intended to provide a joint such as an oil country tubular good.

【0005】[0005]

【課題を解決するための手段】油井管ネジ継ぎ手は、繰
り返し締め込み作業を行うが、雄ネジ側(ピン)、雌ネ
ジ側(ボックス)嵌合接触部には、通常メッキまたはコ
ーテイングが施されると共に、使用時には金属粉を含む
コンパウンドグリースを塗布して焼き付きを防止してい
る。本発明は、この焼き付き現象を積極的に利用するこ
とを発想の原点とするものである。
Means for Solving the Problems An oil country tubular good screw joint is repeatedly tightened, but the male screw side (pin) and the female screw side (box) fitting contact portions are usually plated or coated. In addition, when used, compound grease containing metal powder is applied to prevent seizure. The present invention is based on the idea of actively utilizing this burn-in phenomenon.

【0006】その概要を説明すると、内面に雌ネジを有
するボックスと外面に雄ネジを有するピンとを螺合する
管のネジ継手において、ネジなし先端部に円錐面と管軸
垂直面と、その内側に凹の傾斜角をもつ端部円錐面から
構成されるピン側と、ピン先端形状に対応するようにネ
ジ奥部に設けられたネジなし円錐面と、それに交わる外
側に凸の端部円錐面から構成されるボックス側とからな
る継ぎ手部材に対して、ネジ部には嵌合時の焼き付きを
防止するため、前記の焼き付き回避処理としてメッキ、
コーテイング等の表面処理を施すが、円錐面およびそれ
と交わる端部円錐面には、ピン、ボックスとも凝着の妨
げになるメッキ、潤滑剤を適用せず、使用直前には脱脂
処理を十分行い凝着を起こし易くしておく。
[0006] In brief, in a threaded joint of a pipe in which a box having a female thread on the inner surface and a pin having a male thread on the outer surface are screwed, a conical surface, a vertical surface of the tube axis, and an inner surface thereof are formed at the threadless tip. The pin side composed of an end conical surface with a concave inclination angle, a screwless conical surface provided on the screw inner part corresponding to the pin tip shape, and an outwardly convex end conical surface intersecting it For the joint member consisting of the box side composed of: To prevent seizure at the time of fitting to the screw part, plating as the above-mentioned seizure avoidance processing,
Apply a surface treatment such as coating, but do not apply plating or lubricant to the conical surface and the conical end surface that intersects with the pin and box. Make it easy to wear.

【0007】本継ぎ手を締め込むと、円錐面が接触する
まではピン、ボックスのネジが嵌合し、ピンはボックス
に円滑にねじ込まれ端部圧接部の調芯機能の役目を果た
す。ピン先端の外周円錐面がボックス奥の内周円錐面に
接触を開始すると、両円錐面は締まり嵌め状態になるよ
うに予め内外径を機械加工されているので、締め込みが
進む程その干渉は大きくなり接触面では相対すべりによ
り大きな摩擦熱が発生する。それと同時に、圧着の妨げ
となる酸化皮膜は破壊され金属新生面同士が接触するよ
うになり、境界面において十分の摩擦発熱と塑性流動を
起こし凝着に必要なエネルギーを励起したところで継ぎ
手の締め込みは完了する。締め込み完了時には、接触面
の摺動は停止し、ピン先端が対応するボックス奥端面に
衝接するるが、この衝接面は管軸に対して傾斜角θ
(°)を持つ構造としているため、この傾斜角に沿って
ピン先端は外側に広がろうとし、前記凝着エネルギーが
蓄積された円錐面を強く押しつける作用を及ぼし圧接工
程を終了する。この構造の中で、摩擦圧接で必要な摩擦
発熱とその直後の強い押しつけ力付与の作用が満たされ
たことになる。
[0007] When the joint is tightened, the pins and the screws of the box are fitted until the conical surfaces come into contact, and the pins are smoothly screwed into the box to perform the function of aligning the end press-contact parts. When the outer conical surface at the tip of the pin starts to contact the inner conical surface at the back of the box, the inner and outer diameters are machined in advance so that both conical surfaces are tightly fitted. Larger friction heat is generated at the contact surface due to relative slip. At the same time, the oxide film that interferes with crimping is destroyed and the new metal surfaces come into contact with each other, causing sufficient frictional heat and plastic flow at the interface to excite the energy required for adhesion, and tightening the joints Complete. When the tightening is completed, the sliding of the contact surface stops, and the pin tip comes into contact with the corresponding inner end surface of the box. This contact surface has an inclination angle θ with respect to the pipe axis.
Due to the structure having (°), the tip of the pin tends to spread outward along this inclination angle, exerting an action of strongly pressing the conical surface in which the adhesion energy has been accumulated, and the pressure welding step is completed. In this structure, the frictional heat generated by the friction welding and the action of applying a strong pressing force immediately thereafter are satisfied.

【0008】本継ぎ手の圧着部は、強固な締め付けによ
り使用時においても、軸方向、半径方向および円周方向
に対してピンとボックスの相対変位が起こらず、このた
め、接合部を剥離させる力が作用しないよう周囲から強
固に拘束されている。もう一つのシールとして、ボック
スネジにパッキン挿入溝を加工し、締め込み時に樹脂シ
ールパッキングリングをその溝に挿入しておく。上記ネ
ジの締め込み過程で、前記シールパッキンは雄ネジと雌
ネジの隙間で圧縮、圧延され僅かなネジのクリアランス
に充満することでシール効果を発揮することができる。
The crimping portion of this joint does not cause relative displacement between the pin and the box in the axial direction, the radial direction and the circumferential direction even during use due to strong tightening. It is firmly restrained from surroundings so that it does not act. As another seal, a packing insertion groove is formed in the box screw, and a resin seal packing ring is inserted into the groove when tightening. During the screw tightening process, the seal packing is compressed and rolled in the gap between the male screw and the female screw to fill the slight clearance of the screw, thereby achieving a sealing effect.

【0009】上述した構成により、ラインパイプの接合
が完了し、内部流体に対しては強固な冶金接合気密部を
持ち、外部の海水に対しては樹脂パッキンにてシールが
確保された、作業性に優れ、かつ溶接入熱による材料の
変質を伴わないメカニカルラインパイプ継ぎ手が提供で
きることとなる。
With the above-described configuration, the joining of the line pipe is completed, a strong metallurgical joint is provided for the internal fluid, and a seal is secured with resin packing against the external seawater. A mechanical line pipe joint which is excellent in quality and does not involve deterioration of the material due to welding heat input can be provided.

【0010】[0010]

【発明の実施の形態】以下に本発明による摩擦圧接用管
継ぎ手を図面を以て詳細に説明する。図1は、本発明に
よる摩擦圧接用管継ぎ手の嵌合状態の横断面を示す図で
ある。図1において、管本体の一端ピンにテーパ付の雄
ネジ3が加工され、その先端部には円錐面4と、それと
交わる円錐凹面5が加工されている。ボックス2には、
雄ネジ3に嵌合する雌ネジ3’が加工され、前記雄ネジ
3先端形状に対応するように円錐面4’と、それと交わ
る円錐凸面5’が加工されている。前記ボックス2のネ
ジ部7には、締め込みによる焼き付きを防止するため、
Zn,Sn,Cuなどの金属メッキ、または燐酸皮膜コ
ーテイング、または二硫化モリブデンを樹脂中に分散さ
せ、潤滑なしで締め込みができる特殊コーテイング(特
開昭7−86616号参照)が施されているが、前記ボ
ックス2のネジなし端部8には、これら表面処理は行わ
ない。ピンについても、前記ネジなし端部8に相当する
外周部に対しても表面処理は行わない。また、ボックス
ネジには、シールパッキン溝9を加工し、締め込み前に
樹脂シールパッキン6を挿入しておく。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pipe joint for friction welding according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a fitting state of a pipe joint for friction welding according to the present invention. In FIG. 1, a tapered male screw 3 is machined at one end pin of a tube main body, and a conical surface 4 and a conical concave surface 5 intersecting with it are machined at the tip. In box 2,
A female screw 3 ′ to be fitted to the male screw 3 is machined, and a conical surface 4 ′ and a conical convex surface 5 ′ intersecting with the conical surface 4 ′ are machined so as to correspond to the tip shape of the male screw 3. In order to prevent seizure due to tightening,
Metal plating of Zn, Sn, Cu, etc., or phosphoric acid film coating, or molybdenum disulfide dispersed in resin, and special coating (see JP-A-7-86616) that can be tightened without lubrication are applied. However, the screwless end 8 of the box 2 is not subjected to these surface treatments. No surface treatment is performed on the pin, nor on the outer peripheral portion corresponding to the screwless end 8. Further, a seal packing groove 9 is formed in the box screw, and a resin seal packing 6 is inserted before tightening.

【0011】次に、本発明によるネジ継ぎ手のシール性
を説明する。ネジ締め込みによって、ピン先端円錐面4
が、これと対応するボックス側円錐面4’と接触し、締
め込みが進むにつれて接触面の相対すべり長さおよび面
圧は増大し、ピン先端面5がボックス奥の円錐面5’に
衝接して締め込みを完了する。この時、衝接部に更にト
ルクを負荷することにより、ピン先端10は角度θに沿
って前記円錐面5’面上をせり上がろうとし、円錐面
4、4’間に高い押しつけ荷重を発生させる。図2に、
前記円錐面4、4’の相対すべりと押しつけ荷重の関係
を模式的に示した。
Next, the sealing property of the screw joint according to the present invention will be described. By screwing, the pin tip conical surface 4
Comes into contact with the corresponding conical surface 4 'on the box side, and as the tightening proceeds, the relative sliding length and surface pressure of the contact surface increase, and the pin tip surface 5 comes into contact with the conical surface 5' at the back of the box. To complete the tightening. At this time, by further applying a torque to the contact portion, the pin tip 10 tries to climb on the conical surface 5 ′ along the angle θ, and a high pressing load is applied between the conical surfaces 4 and 4 ′. generate. In FIG.
The relationship between the relative sliding of the conical surfaces 4 and 4 'and the pressing load is schematically shown.

【0012】一方、前記シールパッキン6は、ピンネジ
によって連続的に圧縮、圧延され挿入部の前後2山程度
のネジクリアランスを充満し、外面から前記ネジクリア
ランスを通って浸入する海水を遮断する。また、ネジ部
の潤滑のためのコンパウンドグリースを塗布する場合に
は、ピンのネジ部スパン7に少量塗布する程度とし、ボ
ックス内面には一切塗布しない。このようにすること
で、ネジの締め込みによりコンパウンドグリースが圧着
部を汚染するのを防止すると同時に、前記圧着部と樹脂
パッキンに封じ込められたグリースの圧力上昇を抑え、
ボックスおよびピンに余分の圧力が発生することを防止
する。上記のコンパウンドグリースに代わる特殊なコー
テイング処理が可能で、しかも同様な効果が発揮される
のであれば、前述したような観点から最適な手段とな
る。
On the other hand, the seal packing 6 is continuously compressed and rolled by a pin screw to fill the screw clearance of about two ridges before and after the insertion portion, and blocks seawater entering from the outer surface through the screw clearance. Also, when applying compound grease for lubricating the screw portion, a small amount is applied to the screw portion span 7 of the pin, and is not applied to the inner surface of the box at all. In this way, compound grease is prevented from contaminating the crimped portion by tightening the screw, and at the same time, the pressure increase of the grease sealed in the crimped portion and the resin packing is suppressed,
Prevents extra pressure on the box and pins. If a special coating treatment can be performed instead of the compound grease described above, and if the same effect is exhibited, it is an optimal means from the above-mentioned viewpoint.

【0013】本発明による摩擦圧接用管継ぎ手の適用に
当たっては、ラインパイプへの適用を主目的とするが、
油井管など完璧な気密性能が必要な箇所に対しても十分
適用可能であることは勿論である。
[0013] In applying the pipe joint for friction welding according to the present invention, the main purpose is to apply to a line pipe.
Needless to say, the present invention is sufficiently applicable to a place where perfect airtightness is required, such as an oil country tubular good.

【0014】[0014]

【実施例】本発明による摩擦圧接用管継ぎ手について、
本発明者らが行った加工、実験およびその結果を実施例
を以て説明する。API規格、X−65グレードの外
径:324mm、肉厚:12.7mmの鋼管にAPI規
格によるバットレスを切ったネジ継ぎ手に、ピン先端肩
部10の厚さを7mmとし、ピン先端円錐面のテーパ:
1/10、直径干渉代:1.2mm、ピン先端長さ:2
5mmとし、ボックスには管端から70mmの完全ネジ
嵌合位置に幅:5mm、深さネジ底:2mmのパッキン
用溝を加工し、そこに、幅:4.4mm、厚み:3.3
mmのテフロンパッキンを挿入し、ボックスにはポリア
ミド樹脂に二硫化モリブデンを分散させて、それを吹き
付けた特殊耐焼き付き防止コーテイングを適用して継ぎ
手の締め付けを行った。この締め付けに当たっては、ピ
ン、ボックスの金属接触部を直前にペーパー研磨で表面
の錆を除去した後、丁寧にアセトンで脱脂し、3ton
−mの荷重で締め込みを行った。この締め込み作業後、
継ぎ手を長手方向に切断し、嵌合断面の接着状態を顕微
鏡にで調査したところ、金属接触部では明らかに融着部
が観察された。他のサンプルにて金属接触部の背後にリ
ーク検出器を接続し、80%の降伏圧力にて金属接触部
のみの窒素ガスによる気密試験を実施したが、全くリー
クは検出されなかった。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Regarding a pipe joint for friction welding according to the present invention,
Workings, experiments, and results obtained by the present inventors will be described with reference to examples. API standard, X-65 grade, outer diameter: 324 mm, wall thickness: 12.7 mm. A threaded joint made by cutting a buttress according to the API standard on a steel pipe. Taper:
1/10, diameter interference allowance: 1.2 mm, pin tip length: 2
The box is formed with a packing groove having a width of 5 mm and a depth of 2 mm at the complete screw fitting position of 70 mm from the end of the tube, and a width of 4.4 mm and a thickness of 3.3 mm.
mm of Teflon packing was inserted, molybdenum disulfide was dispersed in a polyamide resin in the box, and a special anti-seizing coating coated with the molybdenum was sprayed onto the box to tighten the joint. In this tightening, the metal contact part of the pin and the box was immediately polished with paper to remove rust on the surface, and then degreased with acetone.
Tightening was performed with a load of −m. After this tightening work,
When the joint was cut in the longitudinal direction and the state of adhesion of the fitted cross section was examined with a microscope, a fused portion was clearly observed at the metal contact portion. In another sample, a leak detector was connected behind the metal contact portion, and an airtight test was performed on only the metal contact portion with nitrogen gas at a yield pressure of 80%, but no leak was detected.

【0015】[0015]

【発明の効果】上述したように、本発明による摩擦圧接
用管継ぎ手は、金属接触シール部の焼き付きを積極的に
起こすために、接触部に何ら表面処理を施さず、摩擦発
熱生成と最終押しつけ機能という圧接における基本工程
を継ぎ手自身に具備させたこと、外面シールに樹脂リン
グパッキンを採用したこと、更にグリース不要な特殊樹
脂コーテイングを適用することにより、内部流体に対し
ては強固な冶金接合気密部を持ち、外部の海水に対して
は樹脂パッキンにてシールが確保され、作業性に優れ、
かつ溶接入熱による材料の変質を伴わないメカニカルラ
インパイプ継ぎ手が提供できるものである。
As described above, the pipe joint for friction welding according to the present invention does not perform any surface treatment on the contact portion so as to positively cause seizure of the metal contact seal portion. Strong metallurgical bonding against internal fluids by applying the basic process of pressure welding, which is a function, to the fitting itself, adopting a resin ring packing for the outer surface seal, and applying a special resin coating that does not require grease. The seal is secured with resin packing against external seawater, and it has excellent workability.
Further, it is possible to provide a mechanical line pipe joint which does not involve deterioration of the material due to heat input by welding.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明による摩擦圧接用管継ぎ手の構造を示す
横断面模式図。
FIG. 1 is a schematic cross-sectional view showing the structure of a pipe joint for friction welding according to the present invention.

【図2】本発明による摩擦圧接用管継ぎ手の締め込み時
に発生する金属接触部での相対すべりと接触面圧の変化
を示す図。
FIG. 2 is a view showing a change in a relative slip and a contact surface pressure at a metal contact portion which occurs when a pipe joint for friction welding according to the present invention is tightened.

【符号の説明】[Explanation of symbols]

1…ピン 2…ボックス 3…雄ネジ 4、4’…ピンおよびボックスの金属接触圧着面 5、5’…ピンおよびボックスの衝接面 6…樹脂リングパッキン 7…ボックス(およびピン)焼き付き防止表面処理区間 8…表面処理、潤滑を行わない領域 9…ボックス樹脂パッキン挿入溝 10…ピンネジなし端部 DESCRIPTION OF SYMBOLS 1 ... Pin 2 ... Box 3 ... Male screw 4, 4 '... Metal contact crimping surface of pin and box 5, 5' ... Contact surface of pin and box 6 ... Resin ring packing 7 ... Box (and pin) seizure prevention surface Processing section 8: Area where surface treatment and lubrication are not performed 9 ... Box resin packing insertion groove 10 ... Pin screw end

───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡村 邦彦 東京都千代田区大手町2−6−3 新日本 製鐵株式会社内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kunihiko Okamura 2-6-3 Otemachi, Chiyoda-ku, Tokyo Inside Nippon Steel Corporation

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 内面に雌ネジを有するボックスと外面に
雄ネジを有するピンとを螺合する管継手において、ネジ
なし先端部に円錐面4と、管軸垂直面に対して内側に凹
の傾斜角θをもつ端部円錐面5から構成されるピン1側
と、ピン先端形状に対応するようにネジ奥部に設けられ
たネジなし円錐面4’と、それに交わる外側に凸の端部
円錐面5’から構成されるボックス2側とからなる継ぎ
手部材に対し、ピン、ボックスの両方、またはボックス
のネジ部にのみメッキ、コーテイング等の表面処理を施
し、円錐面およびそれと交わる端部円錐面には、ピン、
ボックスともメッキ、コーテイング或いは潤滑剤を適用
しない構造を備えたことを特徴とする摩擦圧接用管継ぎ
手。
1. A pipe joint for screwing a box having an internal thread on an inner surface and a pin having an external thread on an outer surface, wherein a conical surface 4 is provided at a threadless tip portion, and a slope which is concave inward with respect to a tube axis vertical surface. A pin 1 side composed of an end conical surface 5 having an angle θ, a screwless conical surface 4 ′ provided at the screw inner part corresponding to the shape of the pin tip, and an outwardly convex end cone intersecting the same. The joint member consisting of the surface 5 'and the box 2 side is subjected to a surface treatment such as plating or coating on both the pin and the box, or only on the threaded portion of the box, and the conical surface and the end conical surface intersecting therewith. Has a pin,
A pipe joint for friction welding, characterized in that the box has a structure in which plating, coating or lubricant is not applied.
【請求項2】 内面に雌ネジを有するボックスと外面に
雄ネジを有するピンとを螺合する管継手において、ネジ
なし先端部に円錐面4と、管軸垂直面に対して内側に凹
の傾斜角θをもつ管端面5から構成されるピン1側と、
ピン先端形状に対応するようにネジ奥部に設けられたネ
ジなし円錐面4’と、それに交わる外側に凸の端部円錐
面5’から構成されるボックス2側とからなる継ぎ手部
材に対し、ピン、ボックスの両方、またはボックスのネ
ジ部にのみメッキ、コーテイング等の表面処理を施し、
円錐面およびそれと交わる端部円錐面には、ピン、ボッ
クスともメッキ、コーテイング或いは潤滑剤を適用しな
い構造とし、前記ボックスの雌ネジの溝部の一部を加工
したパッキン溝を設けて、これに樹脂シールパッキンリ
ングを挿入したことを特徴とする摩擦圧接用管継ぎ手。
2. A pipe joint in which a box having an internal thread on an inner surface and a pin having an external thread on an outer surface are screwed together. A pin 1 composed of a pipe end face 5 having an angle θ;
For a joint member composed of a screwless conical surface 4 ′ provided at the back of the screw so as to correspond to the pin tip shape, and a box 2 side composed of an outwardly protruding end conical surface 5 ′ intersecting therewith, Both the pin and the box, or only the screw part of the box, are subjected to surface treatment such as plating and coating,
The conical surface and the end conical surface intersecting with it have a structure in which neither the pin nor the box is plated, coated or lubricated, and a packing groove is formed by processing a part of the groove portion of the internal thread of the box, and a resin groove is formed on the groove. A pipe joint for friction welding, wherein a seal packing ring is inserted.
【請求項3】 前記ピンまたはボックス、またはその両
方の継ぎ手に自己潤滑機能を有する特殊樹脂コーテイン
グを適用したことを特徴とする請求項1または2記載の
メカニカル継ぎ手。
3. The mechanical joint according to claim 1, wherein a special resin coating having a self-lubricating function is applied to the joint of the pin and / or the box.
JP25057897A 1997-09-16 1997-09-16 Friction welding tube fitting Withdrawn JPH1182829A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25057897A JPH1182829A (en) 1997-09-16 1997-09-16 Friction welding tube fitting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25057897A JPH1182829A (en) 1997-09-16 1997-09-16 Friction welding tube fitting

Publications (1)

Publication Number Publication Date
JPH1182829A true JPH1182829A (en) 1999-03-26

Family

ID=17209983

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25057897A Withdrawn JPH1182829A (en) 1997-09-16 1997-09-16 Friction welding tube fitting

Country Status (1)

Country Link
JP (1) JPH1182829A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002227958A (en) * 2001-01-30 2002-08-14 Tsubaki Nakashima Co Ltd Screw shaft for ball screw
JP2012102867A (en) * 2010-10-14 2012-05-31 Ck Metals Co Ltd Pipe joint with torque control function
JP2015151733A (en) * 2014-02-13 2015-08-24 東京鐵鋼株式会社 Method of connecting coupler and steel bar, and connection structure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002227958A (en) * 2001-01-30 2002-08-14 Tsubaki Nakashima Co Ltd Screw shaft for ball screw
JP2012102867A (en) * 2010-10-14 2012-05-31 Ck Metals Co Ltd Pipe joint with torque control function
JP2015151733A (en) * 2014-02-13 2015-08-24 東京鐵鋼株式会社 Method of connecting coupler and steel bar, and connection structure

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A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20041207